WO2019208424A1 - Vehicle display device - Google Patents

Vehicle display device Download PDF

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Publication number
WO2019208424A1
WO2019208424A1 PCT/JP2019/016781 JP2019016781W WO2019208424A1 WO 2019208424 A1 WO2019208424 A1 WO 2019208424A1 JP 2019016781 W JP2019016781 W JP 2019016781W WO 2019208424 A1 WO2019208424 A1 WO 2019208424A1
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WO
WIPO (PCT)
Prior art keywords
light
incident
display device
vehicle
light guide
Prior art date
Application number
PCT/JP2019/016781
Other languages
French (fr)
Japanese (ja)
Inventor
尚 山添
俊 関谷
彩子 藤田
Original Assignee
日本精機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本精機株式会社 filed Critical 日本精機株式会社
Publication of WO2019208424A1 publication Critical patent/WO2019208424A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/22—Display screens

Definitions

  • the present invention relates to a vehicle display device that projects light onto a projection target disposed at the front of a vehicle body.
  • Some vehicles are equipped with a vehicle display device (head-up display device) that projects light onto a projection target such as a windshield and provides necessary information to a driver (viewer).
  • a vehicle display device head-up display device
  • the vehicle display device is provided on a dashboard of the vehicle and projects light toward a windshield.
  • a display device for a vehicle as disclosed in Patent Document 1 includes a display unit that can emit light, a collimating optical system that allows light emitted from the display unit to pass through in parallel light, and the collimating optical system.
  • a reflection mirror that reflects toward the screen.
  • the light guide is formed so as to emit incident light in an oblique direction from the first surface.
  • the reflection mirror is disposed in front of the light guide, and reflects light transmitted through the light guide toward the windshield.
  • the driver recognizes that an image is projected in front of the windshield by projecting the light emitted from the vehicle display device onto the windshield.
  • the vehicle display device is attached to the dashboard space of the vehicle.
  • other parts may be attached to the space where the vehicle display device is attached. Therefore, the space in which the vehicle display device can be attached is limited.
  • FIG. 7 shows a vehicle display device 100 according to Patent Document 1.
  • the first and second surfaces 141b and 142b of the light guide 140 are disposed obliquely with respect to the vehicle width direction of the vehicle body.
  • the light guide body 140 By arranging the light guide body 140 at an angle, the light emitted from the first surface 141b is vertically incident on the reflection mirror 113 provided in front.
  • An object of the present invention is to provide a compact vehicle display device.
  • the vehicle display device that projects light onto the projection portion provided in the front portion of the vehicle body and causes the viewer to recognize the light projected onto the projection portion as a virtual image.
  • Display means capable of emitting light, collimating optical system for allowing the light emitted from the display means to pass in parallel light, and light that has passed through the collimating optical system are incident and the incident light is parallel to each other
  • a light guide that reflects and travels by reflecting the first surface and the second surface provided; and an incident light correction member that corrects the light emitted from the first surface in a predetermined direction.
  • the light guide is arranged such that the first surface and the second surface are both along the vehicle width direction of the vehicle body, and diffracts or reflects light passing through the first light guide.
  • a vehicular display device is provided that includes a deflecting unit that emits light from a surface.
  • the incident angle of the light that passes through the collimating optical system and is incident on the light guide is a critical angle that is the minimum angle at which the light incident on the light guide is totally reflected. In this case, the angle is larger than this critical angle.
  • the collimating optical system includes a collimating lens that transmits light so that light is incident on the first surface
  • the collimating lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other.
  • the incident light correction member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other.
  • the light guide is disposed such that the first surface and the second surface are both along the vehicle width direction of the vehicle body. Furthermore, the light guide includes a deflecting unit that diffracts or reflects light passing through the inside and emits the light from the first surface. First, by arranging the first and second surfaces along the vehicle width direction of the vehicle body, the light guide is arranged substantially parallel to the vehicle width direction. As a result, the vehicle display device can shorten the width in the front-rear direction, and becomes smaller. Further, the light guide includes a deflecting portion that diffracts or reflects light passing through the inside and emits light from the first surface, so that the light guide is disposed substantially parallel to the vehicle width direction. However, light can be emitted forward. That is, a compact vehicle display device can be provided.
  • the incident angle of the light which passes through a collimating optical system and injects into the 1st surface and 2nd surface of a light guide is the light which injected into the 1st surface and 2nd surface If the minimum angle for total reflection is the critical angle, the angle is larger than this critical angle.
  • the incident angle of light on the first surface is first totally reflected by the first surface. A part of the light reflected by the first surface is diffracted by the deflecting unit, and the rest is incident on the second surface. Thereafter, the light incident on the second surface is incident on the second surface at an angle larger than the critical angle, and thus is totally reflected on the second surface.
  • the collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface.
  • the collimating lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device. As a result, a more compact vehicle display device can be provided.
  • the incident light correction member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device. As a result, a more compact vehicle display device can be provided.
  • FIG. 2 is a 2-2 cross-sectional view of the vehicle display device shown in FIG. 1.
  • FIG. 3 is a 3-3 cross-sectional view of the vehicle display device shown in FIG. 2. It is a figure which shows the effect
  • FIG. It is a figure which shows the example of a change of the collimating lens by Example 1, and a light guide.
  • FIG. It is sectional drawing of the display apparatus for vehicles by Example 2.
  • FIG. It is a figure explaining the problem at the time of mounting the conventional vehicle display apparatus in a vehicle.
  • front and rear refer to front and rear based on the traveling direction of the vehicle, and left and right refer to right and left based on the passenger.
  • Fr indicates the front
  • Rr indicates the rear
  • Le indicates the left
  • Ri indicates the right
  • Up indicates the top
  • Dn indicates the bottom.
  • FIG. 1 shows a cross-sectional view in the vehicle longitudinal direction of a vehicle Ve on which the vehicle display device 10 is mounted.
  • the vehicle display device 10 is attached to, for example, a dashboard space of the vehicle Ve, and projects light onto the vehicle windshield Ws (projected portion Ws).
  • the driver Mn viewer Mn
  • the driver Mn recognizes that the image I (virtual image I) is projected in front of the windshield Ws.
  • the driver Mn can obtain information necessary for traveling through the windshield Ws.
  • FIG. 2 is a cross-sectional view of the vehicle display device 10 in the vehicle width direction (left-right direction) of the vehicle body.
  • the vehicle display device 10 includes a case 20, display means 11 fixed inside the case 20, a collimating optical system 30 that allows light emitted from the display means 11 to pass through and is made into parallel light, and the collimator
  • the light guide 40 in which the light that has passed through the optical system 30 enters, the incident light correction member 13 that corrects the light emitted from the light guide 40 in a predetermined direction, and the display unit 11 are controlled.
  • a control unit 14 controls the display unit 11 in a predetermined direction.
  • the case 20 is configured by covering the lower case 21 with the upper case 22.
  • the case 20 has a box shape and is made of a synthetic resin that can block light from the outside.
  • the lower case 21 includes a lower case bottom surface portion 21a and a lower case wall portion 21b raised upward from a side edge of the lower case bottom surface portion 21a.
  • the upper case 22 has an upper case ceiling portion 22a and an upper case wall portion 22b that is lowered from a side edge of the upper case ceiling portion 22a.
  • the display means 11 includes a light source 11a capable of emitting light and a display panel 11b through which the light emitted from the light source 11a is transmitted.
  • the light source 11a has an LED lamp mounted on a substrate.
  • the light source 11a is not limited to one using an LED lamp as long as it can irradiate the display panel 11b.
  • a transmissive display element such as a TFT (Thin Film Transistor) liquid crystal panel is employed.
  • the collimating optical system 30 includes a first mirror 31 that reflects the light emitted from the display unit 11, a second mirror 32 that receives the light reflected by the first mirror 31, and the second mirror.
  • a collimating lens 33 that transmits the reflected light and converts the transmitted light into parallel light.
  • the first mirror 31 includes a first base 31a that is a flat inorganic glass, and a first reflecting portion in which a metal capable of reflecting light is formed in a thin film on the surface of the first base 31a. And 31b.
  • the first reflecting portion 31b is formed in a thin film shape from a metal such as aluminum.
  • the second mirror 32 is a second reflecting portion in which a second base material 32a made of flat inorganic glass and a metal capable of reflecting light are formed in a thin film shape on the surface of the second base material 32a. 32b.
  • the second reflecting portion 32b is formed in a thin film shape from a metal such as aluminum, for example.
  • the collimating lens 33 has a light incident surface and a light output surface formed substantially parallel to each other.
  • a liquid crystal polymer lens can be employed as the collimating lens 33.
  • the liquid crystal polymer lens transmits incident light and converts it into parallel light.
  • the collimating lens 33 may be any lens that can change the transmitted light into parallel light, and a lenticular lens can be adopted in addition to the liquid crystal polymer lens.
  • the lenticular lens is, for example, inorganic glass.
  • Each of the first and second mirrors 31 and 32 and the collimating lens 33 is arranged such that light that has passed through the collimating optical system 30 and entered the light guide 40 is totally reflected inside the light guide 40. . That is, when the critical angle is the minimum angle at which the light incident on the light guide 40 is totally reflected, each of the first and second mirrors 31 and 32 and the collimating lens 33 has a boundary inside the light guide 40. Light is arranged so that the incident angle with respect to the surface is greater than the critical angle.
  • FIG. 3 is a cross-sectional view of the vehicle display device 10 in the vehicle body vertical direction.
  • the light guide 40 is disposed along the vehicle width direction of the vehicle, and emits light toward the windshield Ws (see FIG. 1) located above.
  • the light guide 40 is configured so that the light guide body 41 in which the light that has passed through the collimator lens 33 enters and a part of the light that enters the light guide body 41 are emitted to the outside of the light guide 40. And a light guide diffractive portion 42 that diffracts and reflects the remaining light toward the light guide main body 41.
  • the light guide body 41 has an incident surface 41a for allowing the light transmitted through the collimator lens 33 to enter the light guide 40, and the light incident from the incident surface 41a is reflected toward the light guide diffraction unit 42. 1 surface 41b and an opposing surface portion 41c which is a surface formed to oppose the first surface 41b.
  • the light guide body 41 is, for example, inorganic glass.
  • the incident surface portion 41 a is formed at one end portion on the side where the collimating lens 33 is disposed, and makes light transmitted through the collimating lens 33 enter the light guide 40.
  • the incident surface portion 41a is a surface formed obliquely with respect to the first surface 41b and the opposed surface portion 41c when the end portion of the light guide 40 has an acute angle so that light can easily enter the inside.
  • the first surface 41b is arranged along the vehicle width direction of the vehicle body.
  • the first surface 41b is a boundary surface on which light that has passed through the incident surface portion 41a first reaches.
  • the light that has passed through the collimating optical system 30 and transmitted through the incident surface portion 41a is incident on the first surface 41b at an angle larger than the critical angle. That is, the light passing through the collimating optical system 30 and the incident surface portion 41a is first totally reflected by the first surface 41b.
  • the opposing surface portion 41c is formed in parallel to the first surface 41b.
  • the light reflected by the first surface 41 b passes through the opposing surface portion 41 c and enters the light guide diffraction portion 42.
  • the light guide diffracting section 42 is formed integrally with the facing surface section 41c and diffracts a part of incident light, and a second surface 42b that reflects the remaining light incident on the deflecting section 42a. ,have.
  • the deflecting portion 42a is provided below the facing surface portion 41c, and is incident on the light reflected by the first surface 41b located above the facing surface portion 41c.
  • the deflecting unit 42a diffracts the light in a direction perpendicular to the first surface 41b so that the light incident on the deflecting unit 42a is emitted from the first surface 41b.
  • the deflecting unit 42a is made of, for example, a holographic optical element, and a thin film capable of diffracting light in a predetermined wavelength band is stacked.
  • the deflecting unit 42a diffracts the light incident on the deflecting unit 42a according to the wavelength band and transmits the remaining light.
  • the deflecting unit 42a is not limited to a holographic optical element as long as it can diffract the incident part of light so that it can pass through the first surface 41b.
  • a holographic optical element for example, a black diffraction grating, a liquid crystal polymer diffraction grating, and a blazed diffractive optical element can be employed for the deflecting unit 42a.
  • the second surface 42b is a surface formed at the lower part of the deflecting portion 42a, and totally reflects the light incident on the second surface 42b toward the first surface 41b. That is, the light incident on the second surface 42b is incident so that the incident angle is larger than the critical angle.
  • the second surface 42b is formed to be parallel to the first surface 41b.
  • the first and second surfaces 41b and 42b are provided parallel to each other along the vehicle width direction of the vehicle body, and reflect the light incident from the incident surface portion 41a to the other end of the light guide 40. .
  • the incident light correction member 13 is formed such that light is transmitted therethrough and the light incident surface and the light exit surface are substantially parallel to each other.
  • the incident light correction member 13 is made of, for example, a liquid crystal polymer lens.
  • the incident light correction member 13 is disposed above the first surface 41b and transmits light emitted from the first surface 41b of the light guide 40 toward the upper windshield Ws. Further, the incident light correction member 13 refracts the light transmitted through the incident light correction member 13 so that the light projected onto the windshield Ws and reflected by the windshield Ws becomes parallel light.
  • the incident light correction member 13 only needs to be able to refract light so that the light reflected by the windshield Ws becomes parallel light.
  • a lenticular lens can also be adopted.
  • the lenticular lens is, for example, inorganic glass.
  • Control unit 14 controls blinking of light source 11a. Further, the control unit 14 can project an arbitrary image I (see FIG. 1) in front of the windshield Ws by controlling the voltage of the display panel 11b.
  • the vehicle display device 10 is attached to a dashboard space of the vehicle Ve and emits light toward the windshield Ws.
  • the driver Mn recognizes the projected light as an image I.
  • FIG. 4 shows the optical path of the light emitted from the vehicle display device 10 and the display means 11 and reaching the windshield Ws.
  • the light emitted from the display means 11 passes through the collimating optical system 30 and becomes parallel light, and enters the light guide 40 from the incident surface portion 41a. Thereafter, the light incident on the light guide 40 reaches the first surface 41b and is totally reflected by the first surface 41b.
  • the incident angle of light on the first surface 41b is ⁇ and the critical angle that is the minimum angle at which light is totally reflected is ⁇
  • the light is reflected on the first surface so that ⁇ > ⁇ . 41b.
  • the light totally reflected by the first surface 41b goes to the second surface 42b.
  • the light traveling toward the second surface 42b eventually enters the deflecting unit 42a.
  • the deflecting unit 42a diffracts a part of the incident light in a direction perpendicular to the first surface 41b. For this reason, a part of the light incident on the deflecting unit 42a is incident on the first surface 41b perpendicularly and is transmitted through the first surface 41b.
  • the remaining light is totally reflected by the second surface 42b formed below the deflecting portion 42a.
  • the remaining light incident on the deflecting unit 42a is light so that ⁇ > ⁇ , where ⁇ is the angle of incidence on the second surface 42b and ⁇ is the minimum angle at which the light is totally reflected. Is incident on the second surface 42b.
  • the light that has passed through the first surface 41b passes through the incident light correction member 13 provided above the first surface 41b and is projected onto the upper windshield Ws.
  • the light totally reflected by the second surface 42b reaches the first surface 41b, and is totally reflected by the first surface 41b toward the second surface 42b.
  • the light directed toward the second surface 42b eventually enters the deflecting unit 42a, is deflected so that part of the light is perpendicular to the first surface 41b, and the remaining light is the second surface 42b. And is totally reflected by the second surface 42b.
  • the light that has entered the light guide 40 from the incident surface portion 41 a is reflected by the first and second surfaces 41 b and 42 b and travels inside the light guide 40. While traveling inside the light guide 40, light is diffracted in the vertical direction by the deflecting portion 42a and transmitted through the first surface 41b. The light transmitted through the first surface 41b passes through the incident light correction member 13 disposed above and reaches the windshield Ws disposed further upward.
  • the light guide 40 is arranged such that the first surface 41b and the second surface 42b are both along the vehicle width direction of the vehicle body. Further, the light guide 40 includes a deflecting unit 42a that diffracts light passing through the inside and emits the light from the first surface 41b. First, the first and second surfaces 41b and 42b are arranged along the vehicle width direction of the vehicle body, so that the light guide 40 is arranged substantially parallel to the vehicle width direction. As a result, the display device 10 for a vehicle can shorten the width in the front-rear direction and becomes smaller.
  • the light guide 40 since the light guide 40 includes a deflecting portion 42a that diffracts light passing through the inside and emits light from the first surface 41b, the light guide 40 is substantially parallel to the vehicle width direction. Even if it arrange
  • the vehicular display device 10 is incident in the front-rear direction of the light guide 40 by disposing the transmissive incident light correction member 13 above the first surface 41b with the first surface 41b facing upward. It is not necessary to arrange the light correction member. As a result, the width of the vehicle display device 10 can be made shorter in the front-rear direction of the vehicle body. That is, the vehicle display device 10 can be made more compact.
  • the incident angle of light passing through the collimating optical system 30 and entering the first surface 41b and the second surface 42b of the light guide 40 is such that the light incident on the first surface 41b and the second surface 42b is totally reflected. If the minimum angle is the critical angle, the angle is larger than this critical angle.
  • the incident angle of the light on the first surface 41b is first totally reflected by the first surface 41b. A part of the light reflected by the first surface 41b is diffracted by the deflecting unit 42a, and the rest is incident on the second surface 42b.
  • the light incident on the second surface 42b is incident on the second surface 42b at an angle larger than the critical angle, and thus is totally reflected by the second surface 42b. That is, by making the incident angle to the first surface 41b and the second surface 42b larger than the critical angle, the light is reflected by the first and second surfaces 41b and 42b without losing light energy. Can be made. As a result, it is not necessary to provide a reflective film that reflects light on the first surface 41b or the second surface 42b. Thereby, the cheap display apparatus 10 for vehicles can be provided.
  • the collimating optical system 30 includes a collimating lens 33 that transmits light so that the light is incident on the first surface 41b.
  • the collimating lens 33 is a liquid crystal polymer lens or lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device 10. As a result, a more compact vehicle display device 10 can be provided.
  • the incident light correcting member 13 is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device 10. As a result, a more compact vehicle display device 10 can be provided.
  • FIG. 5 shows a light guide 40A mounted on a vehicle display device 10A according to a modification.
  • the light guide 40A integrally includes a collimating lens portion 33A that serves to change the transmitted light into parallel light. That is, the collimating lens 33 shown in FIG.
  • the predetermined effect of the present invention can be obtained. Furthermore, the number of parts can be reduced by using the light guide 40A in which the collimating lens portion 33A is integrally formed.
  • FIG. 6 is a cross-sectional view of the second embodiment of the vehicle display device 10B, corresponding to FIG.
  • the position where the deflection unit 42a according to the first embodiment is arranged is changed.
  • Other basic structures are common to the vehicle display device 10 according to the first embodiment.
  • symbol is diverted and detailed description is abbreviate
  • the light guide 40B is a light guide body 41B that makes the light that has passed through the collimator lens 33 incident, and a deflection that reflects the light that has entered the light guide body 41B so as to be emitted from the light guide body 41B. Part 42Ba.
  • the light guide body 41B includes an incident surface 41Ba that allows the light transmitted through the collimator lens 33 to enter the light guide 40B, a first surface 41Bb that reflects the light incident from the incident surface 41Ba, and the first surface 41Bb. And the second surface 41Bc on which the light reflected by the surface 41Bb is incident.
  • the first surface 41Bb and the second surface 41Bc totally reflect the incident light.
  • the first surface 41Bb is a boundary surface where light that has passed through the incident surface portion 41Ba reaches first, and totally reflects the incident light toward the second surface 41Bc.
  • the first surface 41Bb receives the light reflected by the second surface 41Bc and totally reflects the incident light toward the second surface 41Bc.
  • the second surface 41Bc is provided to face the first surface 41Bb.
  • the second surface 41Bc receives a part of the light reflected by the first surface 41Bb and totally reflects the incident light toward the first surface 41Bb.
  • the deflecting unit 42Ba is provided between the first surface 41Bb and the second surface 41Bc, reflects a part of the incident light in a direction substantially perpendicular to the first surface 41Bb, and the remaining part of the second surface 41Bc. Permeate to the side. In other words, the light reflected by the deflecting unit 42Ba is transmitted through the first surface 41Bb and partly emitted from the first surface 41Bb in the vertical direction. In other words, the deflecting unit 42Ba has a characteristic capable of emitting light in the vertical direction to the light guide 40B.
  • the deflection unit 42Ba is, for example, a half mirror, and a plurality of the deflection units 42Ba are arranged inside the light guide body 41B.
  • the half mirror is disposed so as to be inclined so that the light reflected by the first surface 41Bb is perpendicularly incident on the first surface 41Bb.
  • the half mirror here refers to a mirror capable of reflecting a part of light. That is, the half mirror does not necessarily have a light reflectance and transmittance of 1: 1.
  • the reflectance and transmittance may be 1: 9, or 2: 8. good.
  • positioned inside the light guide main-body part 41B may differ.
  • the light guide 40B can be arranged in the vehicle width direction of the vehicle body because the light can be emitted vertically also in the light guide 40B in which the deflection unit 42Ba is arranged in the light guide body 41B.
  • the first and second surfaces 41Bb and 41Bc can be arranged along the vehicle width direction of the vehicle body. Therefore, also in the vehicle display device 10B according to the second embodiment, the present invention can obtain a predetermined effect.
  • the vehicle Ve on which the vehicle display devices 10, 10A and 10B according to the present invention are mounted may be a two-wheeled vehicle or a three-wheeled vehicle other than a four-wheeled vehicle.
  • first and second mirrors 31 and 32 shown in the embodiment are not essential components. That is, you may abolish these as needed. Conversely, the number of mirrors can be increased as necessary. By increasing the number of mirrors, it is possible to increase the degree of freedom of the optical path until light enters the light guides 40, 40A, and 40B.
  • first and second base materials 31a and 32a are described with an example of a flat inorganic glass in the embodiments.
  • the first and second base materials 31a and 32a are not limited to a flat inorganic glass as long as a metal film capable of reflecting light can be deposited. That is, the first and second base materials 31a and 32a may be, for example, an acrylic resin or a cycloolefin polymer resin.
  • first and second reflecting portions 31b and 32b are described with an example of a metal film such as aluminum deposited on the first and second base materials 31a and 32a in the embodiment.
  • the first and second reflecting portions 31b and 32b may be multilayer films that can reflect only light in a predetermined wavelength band (visible light). That is, the first mirror 31 and the second mirror 32 having the first and second reflecting portions 31b and 32b may be cold mirrors.
  • the light guides 40, 40A, and 40B are described with examples that are inorganic glass in the embodiments.
  • the light guides 40, 40 ⁇ / b> A, and 40 ⁇ / b> B are not limited to inorganic glass as long as the light can be incident on the inside. That is, the light guides 40, 40A, and 40B may be, for example, an acrylic resin or a cycloolefin polymer resin that is a transparent resin.
  • the projection target part Ws is described as the windshield Ws in the embodiment.
  • the projected part Ws is not limited to the windshield Ws as long as it can project the light emitted from the vehicle display devices 10, 10 ⁇ / b> A, and 10 ⁇ / b> B. That is, the present invention can also be applied to the vehicle display devices 10, 10 ⁇ / b> A, and 10 ⁇ / b> B that use a so-called combiner as the projection target portion Ws.
  • the present invention is not limited to the examples as long as the operations and effects of the present invention are exhibited.
  • the vehicle display devices 10, 10A, and 10B of the present invention are suitable for being mounted on the vehicle Ve.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
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Abstract

Provided is a compact vehicle image display device. The vehicle display device (10) has a display means (11) capable of emitting light and a light guide (40) into which the light emitted from the display means (11) enters and in which the entered light travels while being reflected by a first surface (41b) and a second surface (42b) arranged parallel to each other. The light guide (40) has the first surface (41b) and the second surface (42b) arranged along the vehicle width direction, and includes a deflecting unit (42a) that diffracts or reflects the internally passing light and causes the light to be emitted via the first surface (41b).

Description

車両用表示装置Vehicle display device
　本発明は、車体の前部に配置された被投影部に光を投射させる車両用表示装置に関する。 The present invention relates to a vehicle display device that projects light onto a projection target disposed at the front of a vehicle body.
　一部の車両には、フロントガラス等の被投影部に光を投射させ運転者（視認者）に必要な情報を提供する車両用表示装置（ヘッドアップディスプレイ装置）が搭載されている。例えば、車両用表示装置は、車両のダッシュボードに設けられ、フロントガラスに向かって光を投射する。このような車両用表示装置の従来技術として特許文献１に開示される技術がある。 Some vehicles are equipped with a vehicle display device (head-up display device) that projects light onto a projection target such as a windshield and provides necessary information to a driver (viewer). For example, the vehicle display device is provided on a dashboard of the vehicle and projects light toward a windshield. As a conventional technique of such a vehicle display device, there is a technique disclosed in Patent Document 1.
　特許文献１に示されるような、車両用表示装置は、光を出射可能な表示手段と、この表示手段から出射された光を平行光となるように通過させるコリメート光学系と、このコリメート光学系を通過した光が入射すると共に入射した光が互いに平行に設けられた第１の面及び第２の面を反射して進む導光体と、この導光体から出射された光をフロントガラスに向かって反射する反射ミラーと、からなる。 A display device for a vehicle as disclosed in Patent Document 1 includes a display unit that can emit light, a collimating optical system that allows light emitted from the display unit to pass through in parallel light, and the collimating optical system. A light guide that is incident on the first surface and the second surface that are provided in parallel with each other, and the light emitted from the light guide is incident on the windshield. And a reflection mirror that reflects toward the screen.
　導光体は、入射した光を第１の面から斜めの方向に向かって出射するよう形成されている。 The light guide is formed so as to emit incident light in an oblique direction from the first surface.
　反射ミラーは、導光体の前方に配置され、導光体を透過した光をフロントガラスに向かって反射させている。 The reflection mirror is disposed in front of the light guide, and reflects light transmitted through the light guide toward the windshield.
　車両用表示装置から出射された光がフロントガラスに投射されることで、運転者は、フロントガラス前方に像が投影されているように認識する。 The driver recognizes that an image is projected in front of the windshield by projecting the light emitted from the vehicle display device onto the windshield.
特開２０１４－１９１１４３号公報JP 2014-191143 A
　例えば、車両用表示装置は、車両のダッシュボードのスペースに取り付けられる。ここで、車両用表示装置が取り付けられるスペースには他の部品が取り付けられることもある。従って、車両用表示装置が取り付け可能なスペースは限られている。 For example, the vehicle display device is attached to the dashboard space of the vehicle. Here, other parts may be attached to the space where the vehicle display device is attached. Therefore, the space in which the vehicle display device can be attached is limited.
　図７を参照する。図７には、特許文献１による車両用表示装置１００が示されている。特許文献１の車両用表示装置１００では、車体の車幅方向を基準として、導光体１４０の第１～第２の面１４１ｂ、１４２ｂが斜めに傾いて配置されている。導光体１４０を傾いて配置させることで、第１の面１４１ｂから出射された光を、前方に設けられた反射ミラー１１３に対して垂直に入射させている。 Refer to FIG. FIG. 7 shows a vehicle display device 100 according to Patent Document 1. In the vehicle display device 100 of Patent Document 1, the first and second surfaces 141b and 142b of the light guide 140 are disposed obliquely with respect to the vehicle width direction of the vehicle body. By arranging the light guide body 140 at an angle, the light emitted from the first surface 141b is vertically incident on the reflection mirror 113 provided in front.
　このような車両用表示装置では、導光体が傾いていることにより、車両用表示装置を取り付け可能なスペースを車体の前後方向において広く確保しなければならない。 In such a vehicle display device, since the light guide body is inclined, a space in which the vehicle display device can be mounted has to be secured widely in the front-rear direction of the vehicle body.
　本発明は、コンパクトな車両用表示装置を提供することを課題とする。 An object of the present invention is to provide a compact vehicle display device.
　請求項１による発明によれば、車体の前部に設けられた被投影部に光を投射させ、前記被投影部に投射された光を虚像として視認者に認識させる車両用表示装置において、
　光を出射可能な表示手段と、この表示手段から出射された光を平行光となるように通過させるコリメート光学系と、このコリメート光学系を通過した光が入射すると共に入射した光が互いに平行に設けられた第１の面及び第２の面を反射して進む導光体と、前記第１の面から出射された光が所定の方向に向かうよう補正する入射光補正部材と、を備え、
　前記導光体は、前記第１の面及び前記第２の面が、共に前記車体の車幅方向に沿うように配置されていると共に、内部を通過する光を回折又は反射し前記第１の面から出射させる偏向部を備えていることを特徴とする車両用表示装置が提供される。 According to the first aspect of the present invention, in the vehicle display device that projects light onto the projection portion provided in the front portion of the vehicle body and causes the viewer to recognize the light projected onto the projection portion as a virtual image.
Display means capable of emitting light, collimating optical system for allowing the light emitted from the display means to pass in parallel light, and light that has passed through the collimating optical system are incident and the incident light is parallel to each other A light guide that reflects and travels by reflecting the first surface and the second surface provided; and an incident light correction member that corrects the light emitted from the first surface in a predetermined direction.
The light guide is arranged such that the first surface and the second surface are both along the vehicle width direction of the vehicle body, and diffracts or reflects light passing through the first light guide. A vehicular display device is provided that includes a deflecting unit that emits light from a surface.
　請求項２に記載のごとく、好ましくは、前記コリメート光学系を通過し前記導光体へ入射する光の入射角は、前記導光体に入射した光が全反射する最小の角度を臨界角とした場合に、この臨界角よりも大きい角度である。 As described in claim 2, preferably, the incident angle of the light that passes through the collimating optical system and is incident on the light guide is a critical angle that is the minimum angle at which the light incident on the light guide is totally reflected. In this case, the angle is larger than this critical angle.
　請求項３に記載のごとく、好ましくは、前記コリメート光学系は、前記第１の面に光を入射させるように光を透過させるコリメートレンズを有し、
　前記コリメートレンズは、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。 As described in claim 3, preferably, the collimating optical system includes a collimating lens that transmits light so that light is incident on the first surface,
The collimating lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other.
　請求項４に記載のごとく、好ましくは、前記入射光補正部材は、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。 Preferably, the incident light correction member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other.
　請求項１に係る発明では、導光体は、第１の面及び第２の面が、共に車体の車幅方向に沿うように配置されている。更に、導光体は、内部を通過する光を回折又は反射し第１の面から出射させる偏向部を含んでいる。まず、第１～第２の面が車体の車幅方向に沿うように配置されることで、導光体が車幅方向に対して略平行に配置される。結果、車両用表示装置は、前後方向における幅を短くすることができ、小さくなる。更に、内部を通過する光を回折又は反射し、第１の面から光を出射させる偏向部を導光体が含んでいることで、導光体を車幅方向に対して略平行に配置しても、前方に向かって光を出射することができる。即ち、コンパクトな車両用表示装置を提供することができる。 In the invention according to claim 1, the light guide is disposed such that the first surface and the second surface are both along the vehicle width direction of the vehicle body. Furthermore, the light guide includes a deflecting unit that diffracts or reflects light passing through the inside and emits the light from the first surface. First, by arranging the first and second surfaces along the vehicle width direction of the vehicle body, the light guide is arranged substantially parallel to the vehicle width direction. As a result, the vehicle display device can shorten the width in the front-rear direction, and becomes smaller. Further, the light guide includes a deflecting portion that diffracts or reflects light passing through the inside and emits light from the first surface, so that the light guide is disposed substantially parallel to the vehicle width direction. However, light can be emitted forward. That is, a compact vehicle display device can be provided.
　請求項２に係る発明では、コリメート光学系を通過し導光体の第１の面と第２の面へ入射する光の入射角は、第１の面と第２の面に入射した光が全反射する最小の角度を臨界角とした場合に、この臨界角よりも大きい角度である。第１の面への光の入射角を臨界角よりも大きい角度とすることで、第１の面に入射した光は、まず、第１の面で全反射される。そして、第１の面で反射された光は、一部が偏向部により回折され残りが第２の面に入射する。その後、第２の面に入射した光は、臨界角よりも大きな角度をもって第２の面に入射するため、第２の面で全反射される。即ち、第１の面及び第２の面への入射角を臨界角よりも大きい角度とすることで、光エネルギーを損失させずに第１～第２の面で光を反射させることができる。結果、光を反射させる反射膜を第１の面又は第２の面に施すことが不要になる。これにより、安価な車両用表示装置を提供することができる。 In the invention which concerns on Claim 2, the incident angle of the light which passes through a collimating optical system and injects into the 1st surface and 2nd surface of a light guide is the light which injected into the 1st surface and 2nd surface If the minimum angle for total reflection is the critical angle, the angle is larger than this critical angle. By setting the incident angle of light on the first surface to an angle larger than the critical angle, the light incident on the first surface is first totally reflected by the first surface. A part of the light reflected by the first surface is diffracted by the deflecting unit, and the rest is incident on the second surface. Thereafter, the light incident on the second surface is incident on the second surface at an angle larger than the critical angle, and thus is totally reflected on the second surface. That is, by making the incident angles to the first surface and the second surface larger than the critical angle, it is possible to reflect light on the first and second surfaces without losing light energy. As a result, it is not necessary to provide a reflective film that reflects light on the first surface or the second surface. Thereby, an inexpensive vehicle display device can be provided.
　請求項３に係る発明では、コリメート光学系は、第１の面に光を入射させるように光を透過させるコリメートレンズを有している。コリメートレンズは、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。光を入射する面及び光を出射する面が互いに略平行であることにより、レンズが薄くなる。即ち、車両用表示装置には、より薄いレンズが組み付けられることとなる。この結果、よりコンパクトな車両用表示装置を提供することができる。 In the invention according to claim 3, the collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface. The collimating lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device. As a result, a more compact vehicle display device can be provided.
　請求項４に係る発明では、入射光補正部材は、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。光の入射する面及び光の出射する面が互いに略平行であることにより、レンズが薄くなる。即ち、車両用表示装置には、より薄いレンズが組み付けられることとなる。この結果、よりコンパクトな車両用表示装置を提供することができる。 In the invention according to claim 4, the incident light correction member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device. As a result, a more compact vehicle display device can be provided.
本発明の実施例１による車両用表示装置の車体前後方向の断面図である。It is sectional drawing of the vehicle body front-back direction of the display apparatus for vehicles by Example 1 of this invention. 図１に示された車両用表示装置の２ー２断面図である。FIG. 2 is a 2-2 cross-sectional view of the vehicle display device shown in FIG. 1. 図２に示される車両用表示装置の３ー３断面図である。FIG. 3 is a 3-3 cross-sectional view of the vehicle display device shown in FIG. 2. 実施例１による車両用表示装置の作用を示す図である。It is a figure which shows the effect | action of the display apparatus for vehicles by Example 1. FIG. 実施例１によるコリメートレンズ及び導光体の変更例を示す図である。It is a figure which shows the example of a change of the collimating lens by Example 1, and a light guide. 実施例２による車両用表示装置の断面図である。It is sectional drawing of the display apparatus for vehicles by Example 2. FIG. 従来の車両用表示装置を車両に搭載した際の問題点を説明する図である。It is a figure explaining the problem at the time of mounting the conventional vehicle display apparatus in a vehicle.
　本発明の実施の形態を添付図に基づいて以下に説明する。なお、説明中、前後とは車両の進行方向を基準として前後をいい、左右とは乗員を基準に左右をいう。また、図中Ｆｒは前、Ｒｒは後、Ｌｅは左、Ｒｉは右、Ｕｐは上、Ｄｎは下、を示している。
＜実施例１＞ Embodiments of the present invention will be described below with reference to the accompanying drawings. In the description, front and rear refer to front and rear based on the traveling direction of the vehicle, and left and right refer to right and left based on the passenger. In the figure, Fr indicates the front, Rr indicates the rear, Le indicates the left, Ri indicates the right, Up indicates the top, and Dn indicates the bottom.
<Example 1>
　図１を参照する。図１には、車両用表示装置１０が搭載された車両Ｖｅの車体前後方向の断面図が示されている。車両用表示装置１０は、例えば、車両Ｖｅのダッシュボードのスペースに取り付けられ、光を車両のフロントガラスＷｓ（被投影部Ｗｓ）に投射する。フロントガラスＷｓに光が投射されることで、運転者Ｍｎ（視認者Ｍｎ）は、フロントガラスＷｓ前方に像Ｉ（虚像Ｉ）が投影されているように認識する。投影された像Ｉに車速やナビゲーション情報等の情報を表示することで、運転者Ｍｎは、走行時に必要な情報をフロントガラスＷｓを介して得ることができる。 Refer to FIG. FIG. 1 shows a cross-sectional view in the vehicle longitudinal direction of a vehicle Ve on which the vehicle display device 10 is mounted. The vehicle display device 10 is attached to, for example, a dashboard space of the vehicle Ve, and projects light onto the vehicle windshield Ws (projected portion Ws). By projecting light onto the windshield Ws, the driver Mn (viewer Mn) recognizes that the image I (virtual image I) is projected in front of the windshield Ws. By displaying information such as vehicle speed and navigation information on the projected image I, the driver Mn can obtain information necessary for traveling through the windshield Ws.
　図２を参照する。図２には、車体の車幅方向（左右方向）における車両用表示装置１０の断面図が示されている。車両用表示装置１０は、ケース２０と、このケース２０の内部に固定された表示手段１１と、この表示手段１１から出射された光を通過させると共に平行光とするコリメート光学系３０と、このコリメート光学系３０を通過した光が入射する導光体４０と、この導光体４０から出射された光が所定の方向に向かうよう補正する入射光補正部材１３と、表示手段１１を制御している制御部１４と、を有している。 Refer to FIG. FIG. 2 is a cross-sectional view of the vehicle display device 10 in the vehicle width direction (left-right direction) of the vehicle body. The vehicle display device 10 includes a case 20, display means 11 fixed inside the case 20, a collimating optical system 30 that allows light emitted from the display means 11 to pass through and is made into parallel light, and the collimator The light guide 40 in which the light that has passed through the optical system 30 enters, the incident light correction member 13 that corrects the light emitted from the light guide 40 in a predetermined direction, and the display unit 11 are controlled. And a control unit 14.
　ケース２０は、下ケース２１に上ケース２２が被せられることによって構成されている。ケース２０は、箱形状を呈し、外部からの光を遮ることができる合成樹脂により形成されている。 The case 20 is configured by covering the lower case 21 with the upper case 22. The case 20 has a box shape and is made of a synthetic resin that can block light from the outside.
　下ケース２１は、下ケース底面部２１ａと、この下ケース底面部２１ａの側縁から上方に立ち上げられた下ケース壁部２１ｂと、を有している。 The lower case 21 includes a lower case bottom surface portion 21a and a lower case wall portion 21b raised upward from a side edge of the lower case bottom surface portion 21a.
　上ケース２２は、上ケース天井部２２ａと、この上ケース天井部２２ａの側縁から下げられた上ケース壁部２２ｂと、を有している。 The upper case 22 has an upper case ceiling portion 22a and an upper case wall portion 22b that is lowered from a side edge of the upper case ceiling portion 22a.
　表示手段１１は、光を出射可能な光源１１ａと、この光源１１ａから出射された光が透過する　表示パネル１１ｂと、を有する。 The display means 11 includes a light source 11a capable of emitting light and a display panel 11b through which the light emitted from the light source 11a is transmitted.
　光源１１ａは、基板にＬＥＤ製のランプが実装されてなる。なお、光源１１ａは、表示パネル１１ｂを照射することができれば、ＬＥＤ製のランプを用いたものに限られない。 The light source 11a has an LED lamp mounted on a substrate. The light source 11a is not limited to one using an LED lamp as long as it can irradiate the display panel 11b.
　表示パネル１１ｂには、例えば、ＴＦＴ（Thin Film Transistor）液晶パネル等の透過型表示素子が採用される。 For the display panel 11b, for example, a transmissive display element such as a TFT (Thin Film Transistor) liquid crystal panel is employed.
　コリメート光学系３０は、表示手段１１から出射された光を反射する第１のミラー３１と、この第１のミラー３１が反射した光が入射する第２のミラー３２と、この第２のミラーが反射した光が透過すると共に透過した光を平行光とするコリメートレンズ３３と、を有する。 The collimating optical system 30 includes a first mirror 31 that reflects the light emitted from the display unit 11, a second mirror 32 that receives the light reflected by the first mirror 31, and the second mirror. A collimating lens 33 that transmits the reflected light and converts the transmitted light into parallel light.
　第１のミラー３１は、平板状の無機ガラスである第１の基材３１ａと、この第１の基材３１ａの表面に光を反射可能な金属を薄膜状に形成させた第１の反射部３１ｂと、からなるフルミラーである。 The first mirror 31 includes a first base 31a that is a flat inorganic glass, and a first reflecting portion in which a metal capable of reflecting light is formed in a thin film on the surface of the first base 31a. And 31b.
　第１の反射部３１ｂは、例えば、アルミニウム等の金属により薄膜状に形成されている。 The first reflecting portion 31b is formed in a thin film shape from a metal such as aluminum.
　第２のミラー３２は、平板状の無機ガラスである第２の基材３２ａと、この第２の基材３２ａの表面に光を反射可能な金属を薄膜状に形成させた第２の反射部３２ｂと、からなるフルミラーである。 The second mirror 32 is a second reflecting portion in which a second base material 32a made of flat inorganic glass and a metal capable of reflecting light are formed in a thin film shape on the surface of the second base material 32a. 32b.
　第２の反射部３２ｂは、例えば、アルミニウム等の金属により薄膜状に形成されている。 The second reflecting portion 32b is formed in a thin film shape from a metal such as aluminum, for example.
　コリメートレンズ３３は、光の入射する面及び光の出射する面が互いに略平行に形成されている。コリメートレンズ３３には、例えば、液晶ポリマーレンズを採用することができる。液晶ポリマーレンズは、入射した光を透過させると共に平行光に変える。また、コリメートレンズ３３は、透過する光を平行光に変えことができるレンズであれば良く、液晶ポリマーレンズの他にレンチキュラーレンズを採用することもできる。レンチキュラーレンズは、例えば、無機ガラスである。 The collimating lens 33 has a light incident surface and a light output surface formed substantially parallel to each other. As the collimating lens 33, for example, a liquid crystal polymer lens can be employed. The liquid crystal polymer lens transmits incident light and converts it into parallel light. Further, the collimating lens 33 may be any lens that can change the transmitted light into parallel light, and a lenticular lens can be adopted in addition to the liquid crystal polymer lens. The lenticular lens is, for example, inorganic glass.
　第１～第２のミラー３１、３２及びコリメートレンズ３３のそれぞれは、コリメート光学系３０を通過し導光体４０へ入射した光が導光体４０内部で全反射されるように配置されている。即ち、導光体４０に入射した光が全反射する最小の角度を臨界角とした場合に、第１～第２のミラー３１、３２及びコリメートレンズ３３のそれぞれは、導光体４０内部の境界面に対して光が入射角が臨界角よりも大きい角度で入射するように配置されている。 Each of the first and second mirrors 31 and 32 and the collimating lens 33 is arranged such that light that has passed through the collimating optical system 30 and entered the light guide 40 is totally reflected inside the light guide 40. . That is, when the critical angle is the minimum angle at which the light incident on the light guide 40 is totally reflected, each of the first and second mirrors 31 and 32 and the collimating lens 33 has a boundary inside the light guide 40. Light is arranged so that the incident angle with respect to the surface is greater than the critical angle.
　図３を参照する。図３には、車体上下方向の車両用表示装置１０の断面図が示されている。導光体４０は、車両の車幅方向に沿って配置されており、上方にあるフロントガラスＷｓ（図１参照）に向かって光を出射する。 Refer to FIG. FIG. 3 is a cross-sectional view of the vehicle display device 10 in the vehicle body vertical direction. The light guide 40 is disposed along the vehicle width direction of the vehicle, and emits light toward the windshield Ws (see FIG. 1) located above.
　図２を参照する。導光体４０は、コリメートレンズ３３を通過した光が入射する導光体本体部４１と、この導光体本体部４１内部に入射した光の一部を導光体４０外部に出射させるように回折すると共に残りの光を導光体本体部４１に向かって反射する導光体回折部４２と、を有している。 Refer to FIG. The light guide 40 is configured so that the light guide body 41 in which the light that has passed through the collimator lens 33 enters and a part of the light that enters the light guide body 41 are emitted to the outside of the light guide 40. And a light guide diffractive portion 42 that diffracts and reflects the remaining light toward the light guide main body 41.
　導光体本体部４１は、導光体４０内部にコリメートレンズ３３を透過した光を入射させる入射面部４１ａと、この入射面部４１ａから入射した光を導光体回折部４２に向かって反射する第１の面４１ｂと、この第１の面４１ｂと対向して形成された面である対向面部４１ｃと、を有している。導光体本体部４１は、例えば、無機ガラスである。 The light guide body 41 has an incident surface 41a for allowing the light transmitted through the collimator lens 33 to enter the light guide 40, and the light incident from the incident surface 41a is reflected toward the light guide diffraction unit 42. 1 surface 41b and an opposing surface portion 41c which is a surface formed to oppose the first surface 41b. The light guide body 41 is, for example, inorganic glass.
　入射面部４１ａは、コリメートレンズ３３が配置されている側の一端部に形成され、コリメートレンズ３３を透過した光を導光体４０の内部に入射させる。入射面部４１ａは、内部に光を入射し易いよう、導光体４０の端部が鋭角とされた際の第１の面４１ｂ及び対向面部４１ｃに対して斜めに形成された面である。 The incident surface portion 41 a is formed at one end portion on the side where the collimating lens 33 is disposed, and makes light transmitted through the collimating lens 33 enter the light guide 40. The incident surface portion 41a is a surface formed obliquely with respect to the first surface 41b and the opposed surface portion 41c when the end portion of the light guide 40 has an acute angle so that light can easily enter the inside.
　第１の面４１ｂは、車体の車幅方向に沿うように配置されている。第１の面４１ｂは、入射面部４１ａを通過した光が最初に到達する境界面である。コリメート光学系３０を通過し入射面部４１ａを透過した光は、第１の面４１ｂに対して臨界角よりも大きい角度で入射する。即ち、コリメート光学系３０及び入射面部４１ａを通過した光は、まず最初に第１の面４１ｂにより全反射される。 The first surface 41b is arranged along the vehicle width direction of the vehicle body. The first surface 41b is a boundary surface on which light that has passed through the incident surface portion 41a first reaches. The light that has passed through the collimating optical system 30 and transmitted through the incident surface portion 41a is incident on the first surface 41b at an angle larger than the critical angle. That is, the light passing through the collimating optical system 30 and the incident surface portion 41a is first totally reflected by the first surface 41b.
　対向面部４１ｃは、第１の面４１ｂに対して平行に形成されている。第１の面４１ｂで反射された光は、対向面部４１ｃを通過し、導光体回折部４２に入射する。 The opposing surface portion 41c is formed in parallel to the first surface 41b. The light reflected by the first surface 41 b passes through the opposing surface portion 41 c and enters the light guide diffraction portion 42.
　導光体回折部４２は、対向面部４１ｃと一体的に形成され入射した光の一部を回折する偏向部４２ａと、この偏向部４２ａに入射した残りの光を反射する第２の面４２ｂと、を有している。 The light guide diffracting section 42 is formed integrally with the facing surface section 41c and diffracts a part of incident light, and a second surface 42b that reflects the remaining light incident on the deflecting section 42a. ,have.
　偏向部４２ａは、対向面部４１ｃの下方に設けられており、対向面部４１ｃの上方に位置する第１の面４１ｂが反射した光に入射される。偏向部４２ａは、偏向部４２ａに入射した光が第１の面４１ｂから出射されるように、第１の面４１ｂに対して垂直な方向に光を回折する。偏向部４２ａは、例えば、ホログラフィック光学素子（Holographic Optical Element）からなり、所定の波長帯域の光を回折可能な薄膜が積層されている。偏向部４２ａは、偏向部４２ａに入射した光を波長帯域に応じて回折し、残りの光を透過させる。 The deflecting portion 42a is provided below the facing surface portion 41c, and is incident on the light reflected by the first surface 41b located above the facing surface portion 41c. The deflecting unit 42a diffracts the light in a direction perpendicular to the first surface 41b so that the light incident on the deflecting unit 42a is emitted from the first surface 41b. The deflecting unit 42a is made of, for example, a holographic optical element, and a thin film capable of diffracting light in a predetermined wavelength band is stacked. The deflecting unit 42a diffracts the light incident on the deflecting unit 42a according to the wavelength band and transmits the remaining light.
　偏向部４２ａは、入射した一部の光が第１の面４１ｂを透過可能となるように回折することができれば何でも良く、ホログラフィック光学素子に限られるものではない。偏向部４２ａには、ホログラフィック光学素子の他、例えば、ブラック回折格子、液晶ポリマー回折格子、ブレーズド回折光学素子を採用することができる。 The deflecting unit 42a is not limited to a holographic optical element as long as it can diffract the incident part of light so that it can pass through the first surface 41b. In addition to the holographic optical element, for example, a black diffraction grating, a liquid crystal polymer diffraction grating, and a blazed diffractive optical element can be employed for the deflecting unit 42a.
　第２の面４２ｂは、偏向部４２ａの下部に形成された面であり、第２の面４２ｂに入射した光を第１の面４１ｂに向かって全反射する。即ち、第２の面４２ｂに入射する光は、入射角が臨界角よりも大きくなるように入射する。第２の面４２ｂは、第１の面４１ｂと平行になるよう形成されている。 The second surface 42b is a surface formed at the lower part of the deflecting portion 42a, and totally reflects the light incident on the second surface 42b toward the first surface 41b. That is, the light incident on the second surface 42b is incident so that the incident angle is larger than the critical angle. The second surface 42b is formed to be parallel to the first surface 41b.
　第１～第２の面４１ｂ、４２ｂは、車体の車幅方向に沿うように互いが平行に設けられており、入射面部４１ａから入射した光を互いに反射させ導光体４０の他端に導く。 The first and second surfaces 41b and 42b are provided parallel to each other along the vehicle width direction of the vehicle body, and reflect the light incident from the incident surface portion 41a to the other end of the light guide 40. .
　入射光補正部材１３は、光を透過させると共に、光の入射する面及び光の出射する面が互いに略平行となるように形成されている。入射光補正部材１３は、例えば、液晶ポリマーレンズからなる。入射光補正部材１３は、第１の面４１ｂの上方に配置されると共に、導光体４０の第１の面４１ｂから出射された光を上方のフロントガラスＷｓへ向けて透過させる。更に、入射光補正部材１３は、フロントガラスＷｓに投射されフロントガラスＷｓで反射する光が平行光となるように、入射光補正部材１３を透過する光を屈折させる。また、入射光補正部材１３は、フロントガラスＷｓで反射した光が平行光となるよう光を屈折させることができれば良く、液晶ポリマーレンズの他、レンチキュラーレンズを採用することもできる。レンチキュラーレンズは、例えば、無機ガラスである。 The incident light correction member 13 is formed such that light is transmitted therethrough and the light incident surface and the light exit surface are substantially parallel to each other. The incident light correction member 13 is made of, for example, a liquid crystal polymer lens. The incident light correction member 13 is disposed above the first surface 41b and transmits light emitted from the first surface 41b of the light guide 40 toward the upper windshield Ws. Further, the incident light correction member 13 refracts the light transmitted through the incident light correction member 13 so that the light projected onto the windshield Ws and reflected by the windshield Ws becomes parallel light. The incident light correction member 13 only needs to be able to refract light so that the light reflected by the windshield Ws becomes parallel light. In addition to the liquid crystal polymer lens, a lenticular lens can also be adopted. The lenticular lens is, for example, inorganic glass.
　制御部１４は、光源１１ａの点滅を制御する。更に、制御部１４は、表示パネル１１ｂを電圧制御することで、フロントガラスＷｓの前方に任意の像Ｉ（図１参照）を投影することができる。 Control unit 14 controls blinking of light source 11a. Further, the control unit 14 can project an arbitrary image I (see FIG. 1) in front of the windshield Ws by controlling the voltage of the display panel 11b.
　次に、実施例１による車両用表示装置１０の作用を説明する。 Next, the operation of the vehicle display device 10 according to the first embodiment will be described.
　図１を参照する。車両用表示装置１０は、例えば、車両Ｖｅのダッシュボートのスペースに取り付けられ、フロントガラスＷｓに向かって光を出射する。車両用表示装置１０から出射された光がフロントガラスＷｓに投射されると、運転者Ｍｎは、投影された光を像Ｉとして認識する。 Refer to FIG. For example, the vehicle display device 10 is attached to a dashboard space of the vehicle Ve and emits light toward the windshield Ws. When the light emitted from the vehicle display device 10 is projected onto the windshield Ws, the driver Mn recognizes the projected light as an image I.
　図４を参照する。図４には、車両用表示装置１０、及び、表示手段１１から出射されフロントガラスＷｓに到達するまでの光の光路が示されている。表示手段１１から出射された光は、コリメート光学系３０を通過し平行光となり、入射面部４１ａから導光体４０内部に入射する。その後、導光体４０内部に入射した光は、第１の面４１ｂに到達し第１の面４１ｂで全反射される。この時、第１の面４１ｂへの光の入射角をθとし、光が全反射される最小の角度である臨界角をγとした場合、θ＞γとなるように光が第１の面４１ｂへ入射している。 Refer to FIG. FIG. 4 shows the optical path of the light emitted from the vehicle display device 10 and the display means 11 and reaching the windshield Ws. The light emitted from the display means 11 passes through the collimating optical system 30 and becomes parallel light, and enters the light guide 40 from the incident surface portion 41a. Thereafter, the light incident on the light guide 40 reaches the first surface 41b and is totally reflected by the first surface 41b. At this time, when the incident angle of light on the first surface 41b is θ and the critical angle that is the minimum angle at which light is totally reflected is γ, the light is reflected on the first surface so that θ> γ. 41b.
　第１の面４１ｂで全反射された光は、第２の面４２ｂに向かう。第２の面４２ｂに向かった光は、やがて偏向部４２ａに入射する。偏向部４２ａは、入射した一部の光を第１の面４１ｂに対して垂直方向に回折する。このため、偏向部４２ａに入射した光のうち、一部の光は第１の面４１ｂに対して垂直に入射し第１の面４１ｂを透過する。一方、残りの光は偏向部４２ａの下部に形成された第２の面４２ｂで全反射される。この時、偏向部４２ａに入射した残りの光は、第２の面４２ｂに入射する角度をδとし、光が全反射される最小の角度をγとした場合、δ＞γとなるように光が第２の面４２ｂへ入射している。 The light totally reflected by the first surface 41b goes to the second surface 42b. The light traveling toward the second surface 42b eventually enters the deflecting unit 42a. The deflecting unit 42a diffracts a part of the incident light in a direction perpendicular to the first surface 41b. For this reason, a part of the light incident on the deflecting unit 42a is incident on the first surface 41b perpendicularly and is transmitted through the first surface 41b. On the other hand, the remaining light is totally reflected by the second surface 42b formed below the deflecting portion 42a. At this time, the remaining light incident on the deflecting unit 42a is light so that δ> γ, where δ is the angle of incidence on the second surface 42b and γ is the minimum angle at which the light is totally reflected. Is incident on the second surface 42b.
　第１の面４１ｂを通過した光は、第１の面４１ｂの上方に設けられている入射光補正部材１３を透過し、上方のフロントガラスＷｓに投射される。一方、第２の面４２ｂで全反射された光は、第１の面４１ｂに到達し、第１の面４１ｂにより第２の面４２ｂに向かって全反射される。 The light that has passed through the first surface 41b passes through the incident light correction member 13 provided above the first surface 41b and is projected onto the upper windshield Ws. On the other hand, the light totally reflected by the second surface 42b reaches the first surface 41b, and is totally reflected by the first surface 41b toward the second surface 42b.
　その後、第２の面４２ｂに向かった光は、やがて偏向部４２ａに入射し、一部の光が第１の面４１ｂに対して垂直となるよう偏向され、残りの光が第２の面４２ｂに到達し第２の面４２ｂで全反射される。 Thereafter, the light directed toward the second surface 42b eventually enters the deflecting unit 42a, is deflected so that part of the light is perpendicular to the first surface 41b, and the remaining light is the second surface 42b. And is totally reflected by the second surface 42b.
　つまり、入射面部４１ａから導光体４０内部へ入射した光は、第１～第２の面４１ｂ、４２ｂを反射して導光体４０内部を進む。導光体４０の内部を進む間、偏向部４２ａにより垂直方向に光が回折され第１の面４１ｂを透過する。第１の面４１ｂを透過した光は、上方に配置された入射光補正部材１３を透過し、更に上方に配置されたフロントガラスＷｓに到達する。 That is, the light that has entered the light guide 40 from the incident surface portion 41 a is reflected by the first and second surfaces 41 b and 42 b and travels inside the light guide 40. While traveling inside the light guide 40, light is diffracted in the vertical direction by the deflecting portion 42a and transmitted through the first surface 41b. The light transmitted through the first surface 41b passes through the incident light correction member 13 disposed above and reaches the windshield Ws disposed further upward.
　次に、実施例１による車両用表示装置１０の効果を説明する。 Next, effects of the vehicle display device 10 according to the first embodiment will be described.
　図２を参照する。導光体４０は、第１の面４１ｂ及び第２の面４２ｂが、共に車体の車幅方向に沿うように配置されている。更に、導光体４０は、内部を通過する光を回折し第１の面４１ｂから出射させる偏向部４２ａを含んでいる。まず、第１～第２の面４１ｂ、４２ｂが車体の車幅方向に沿うように配置されることで、導光体４０が車幅方向に対して略平行に配置される。結果、車両用表示装置１０は、前後方向における幅を短くすることができ、小さくなる。更に、内部を通過する光を回折し、第１の面４１ｂから光を出射させる偏向部４２ａを導光体４０が含んでいることで、導光体４０を車幅方向に対して略平行に配置しても、前方に向かって光を出射することができる。即ち、コンパクトな車両用表示装置１０を提供することができる。 Refer to FIG. The light guide 40 is arranged such that the first surface 41b and the second surface 42b are both along the vehicle width direction of the vehicle body. Further, the light guide 40 includes a deflecting unit 42a that diffracts light passing through the inside and emits the light from the first surface 41b. First, the first and second surfaces 41b and 42b are arranged along the vehicle width direction of the vehicle body, so that the light guide 40 is arranged substantially parallel to the vehicle width direction. As a result, the display device 10 for a vehicle can shorten the width in the front-rear direction and becomes smaller. Further, since the light guide 40 includes a deflecting portion 42a that diffracts light passing through the inside and emits light from the first surface 41b, the light guide 40 is substantially parallel to the vehicle width direction. Even if it arrange | positions, light can be radiate | emitted toward the front. That is, the compact vehicle display device 10 can be provided.
　更に、車両用表示装置１０は、第１の面４１ｂを上方に向けると共に第１の面４１ｂの上方に透過型の入射光補正部材１３を配置することで、導光体４０の前後方向に入射光補正部材を配置することが不要になる。この結果、車両用表示装置１０を、車体の前後方向において幅をより短くすることができる。即ち、車両用表示装置１０をよりコンパクトにすることもできる。 Further, the vehicular display device 10 is incident in the front-rear direction of the light guide 40 by disposing the transmissive incident light correction member 13 above the first surface 41b with the first surface 41b facing upward. It is not necessary to arrange the light correction member. As a result, the width of the vehicle display device 10 can be made shorter in the front-rear direction of the vehicle body. That is, the vehicle display device 10 can be made more compact.
　コリメート光学系３０を通過し導光体４０の第１の面４１ｂと第２の面４２ｂへ入射する光の入射角は、第１の面４１ｂと第２の面４２ｂに入射した光が全反射する最小の角度を臨界角とした場合に、この臨界角よりも大きい角度である。第１の面４１ｂへの光の入射角を臨界角よりも大きい角度とすることで、第１の面４１ｂに入射した光は、まず、第１の面４１ｂで全反射される。そして、第１の面４１ｂで反射された光は、一部が偏向部４２ａにより回折され残りが第２の面４２ｂに入射する。その後、第２の面４２ｂに入射した光は、臨界角よりも大きな角度をもって第２の面４２ｂに入射するため、第２の面４２ｂで全反射される。即ち、第１の面４１ｂ及び第２の面４２ｂへの入射角を臨界角よりも大きい角度とすることで、光エネルギーを損失させずに第１～第２の面４１ｂ、４２ｂで光を反射させることができる。結果、光を反射させる反射膜を第１の面４１ｂ又は第２の面４２ｂに施すことが不要になる。これにより、安価な車両用表示装置１０を提供することができる。 The incident angle of light passing through the collimating optical system 30 and entering the first surface 41b and the second surface 42b of the light guide 40 is such that the light incident on the first surface 41b and the second surface 42b is totally reflected. If the minimum angle is the critical angle, the angle is larger than this critical angle. By making the incident angle of the light on the first surface 41b larger than the critical angle, the light incident on the first surface 41b is first totally reflected by the first surface 41b. A part of the light reflected by the first surface 41b is diffracted by the deflecting unit 42a, and the rest is incident on the second surface 42b. Thereafter, the light incident on the second surface 42b is incident on the second surface 42b at an angle larger than the critical angle, and thus is totally reflected by the second surface 42b. That is, by making the incident angle to the first surface 41b and the second surface 42b larger than the critical angle, the light is reflected by the first and second surfaces 41b and 42b without losing light energy. Can be made. As a result, it is not necessary to provide a reflective film that reflects light on the first surface 41b or the second surface 42b. Thereby, the cheap display apparatus 10 for vehicles can be provided.
　コリメート光学系３０は、第１の面４１ｂに光を入射させるように光を透過させるコリメートレンズ３３を有している。コリメートレンズ３３は、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。光を入射する面及び光を出射する面が互いに略平行であることにより、レンズが薄くなる。即ち、車両用表示装置１０には、より薄いレンズが組み付けられることとなる。この結果、よりコンパクトな車両用表示装置１０を提供することができる。 The collimating optical system 30 includes a collimating lens 33 that transmits light so that the light is incident on the first surface 41b. The collimating lens 33 is a liquid crystal polymer lens or lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device 10. As a result, a more compact vehicle display device 10 can be provided.
　入射光補正部材１３は、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズである。光の入射する面及び光の出射する面が互いに略平行であることにより、レンズが薄くなる。即ち、車両用表示装置１０には、より薄いレンズが組み付けられることとなる。この結果、よりコンパクトな車両用表示装置１０を提供することができる。 The incident light correcting member 13 is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Since the light incident surface and the light output surface are substantially parallel to each other, the lens becomes thin. That is, a thinner lens is assembled to the vehicle display device 10. As a result, a more compact vehicle display device 10 can be provided.
　次に、実施例１による車両用表示装置１０の変更例を説明する。 Next, a modified example of the vehicle display device 10 according to the first embodiment will be described.
　図５を参照する。図５には、変更例による車両用表示装置１０Ａに搭載された導光体４０Ａが示されている。導光体４０Ａは、透過した光を平行光に変える役割を果たすコリメートレンズ部３３Ａを一体的に有している。即ち、図２に示されたコリメートレンズ３３を、導光体４０に一体的に設けた。 Refer to FIG. FIG. 5 shows a light guide 40A mounted on a vehicle display device 10A according to a modification. The light guide 40A integrally includes a collimating lens portion 33A that serves to change the transmitted light into parallel light. That is, the collimating lens 33 shown in FIG.
　このように構成した導光体４０Ａを用いた場合にも、本発明所定の効果を得ることができる。さらには、コリメートレンズ部３３Ａが一体的に形成された導光体４０Ａを用いることにより、部品点数の削減を図ることができる。 Even when the light guide body 40A configured as described above is used, the predetermined effect of the present invention can be obtained. Furthermore, the number of parts can be reduced by using the light guide 40A in which the collimating lens portion 33A is integrally formed.
＜実施例２＞
　次に、本発明の実施例２を図面に基づいて説明する。 <Example 2>
Next, a second embodiment of the present invention will be described with reference to the drawings.
　図６を参照する。図６は、車両用表示装置１０Ｂにおける実施例２の断面図であり、上記図２に対応させて表している。実施例２による車両用表示装置１０Ｂにおいては、実施例１による偏向部４２ａの配置される位置が変わっている。その他の基本的な構造については、実施例１による車両用表示装置１０と共通する。実施例１と共通する部分については、符号を流用すると共に詳細な説明を省略する。 Refer to FIG. FIG. 6 is a cross-sectional view of the second embodiment of the vehicle display device 10B, corresponding to FIG. In the vehicle display device 10B according to the second embodiment, the position where the deflection unit 42a according to the first embodiment is arranged is changed. Other basic structures are common to the vehicle display device 10 according to the first embodiment. About the part which is common in Example 1, a code | symbol is diverted and detailed description is abbreviate | omitted.
　導光体４０Ｂは、コリメートレンズ３３を通過した光を入射させる導光体本体部４１Ｂと、この導光体本体部４１Ｂに入射した光を導光体本体部４１Ｂから出射するように反射する偏向部４２Ｂａと、を有している。 The light guide 40B is a light guide body 41B that makes the light that has passed through the collimator lens 33 incident, and a deflection that reflects the light that has entered the light guide body 41B so as to be emitted from the light guide body 41B. Part 42Ba.
　導光体本体部４１Ｂは、導光体４０Ｂ内部にコリメートレンズ３３を透過した光を入射させる入射面部４１Ｂａと、この入射面部４１Ｂａから入射した光を反射する第１の面４１Ｂｂと、この第１の面４１Ｂｂが反射した光が入射する第２の面４１Ｂｃと、を有している。 The light guide body 41B includes an incident surface 41Ba that allows the light transmitted through the collimator lens 33 to enter the light guide 40B, a first surface 41Bb that reflects the light incident from the incident surface 41Ba, and the first surface 41Bb. And the second surface 41Bc on which the light reflected by the surface 41Bb is incident.
　第１の面４１Ｂｂ及び第２の面４１Ｂｃは入射した光を全反射する。 The first surface 41Bb and the second surface 41Bc totally reflect the incident light.
　第１の面４１Ｂｂは、入射面部４１Ｂａを通過した光が最初に到達する境界面であり、入射した光を第２の面４１Ｂｃに向かって全反射する。また、第１の面４１Ｂｂは、第２の面４１Ｂｃが反射した光が入射すると共に、入射した光を第２の面４１Ｂｃに向かって全反射する。 The first surface 41Bb is a boundary surface where light that has passed through the incident surface portion 41Ba reaches first, and totally reflects the incident light toward the second surface 41Bc. The first surface 41Bb receives the light reflected by the second surface 41Bc and totally reflects the incident light toward the second surface 41Bc.
　第２の面４１Ｂｃは、第１の面４１Ｂｂに対向して設けられている。第２の面４１Ｂｃは、第１の面４１Ｂｂが反射した光の一部が入射すると共に、入射した光を第１の面４１Ｂｂに向かって全反射する。 The second surface 41Bc is provided to face the first surface 41Bb. The second surface 41Bc receives a part of the light reflected by the first surface 41Bb and totally reflects the incident light toward the first surface 41Bb.
　偏向部４２Ｂａは、第１の面４１Ｂｂ及び第２の面４１Ｂｃの間に設けられ、入射した光の一部を第１の面４１Ｂｂに対して略垂直方向に反射し残部を第２の面４１Ｂｃ側に透過する。即ち、偏向部４２Ｂａが反射した光は、入射した光の一部が第１の面４１Ｂｂを透過し第１の面４１Ｂｂから垂直方向に出射されることとなる。言い換えると、偏向部４２Ｂａは、導光体４０Ｂに垂直方向に光を出射可能な特性を持たせている。 The deflecting unit 42Ba is provided between the first surface 41Bb and the second surface 41Bc, reflects a part of the incident light in a direction substantially perpendicular to the first surface 41Bb, and the remaining part of the second surface 41Bc. Permeate to the side. In other words, the light reflected by the deflecting unit 42Ba is transmitted through the first surface 41Bb and partly emitted from the first surface 41Bb in the vertical direction. In other words, the deflecting unit 42Ba has a characteristic capable of emitting light in the vertical direction to the light guide 40B.
　偏向部４２Ｂａは、例えば、ハーフミラーであり、導光体本体部４１Ｂの内部に複数配置されている。ハーフミラーは、第１の面４１Ｂｂが反射した光が、第１の面４１Ｂｂに対して垂直に入射するように傾けられて配置されている。ここで云うハーフミラーとは、光の一部を反射可能なミラーのことを意味している。即ち、ハーフミラーは、光の反射率と透過率とが必ずしも１：１となる必要はなく、例えば反射率及び透過率が１：９であっても良いし、２：８となっていても良い。また、導光体本体部４１Ｂ内部に複数配置されるハーフミラーそれぞれの反射率及び透過率が異なっていても良い。 The deflection unit 42Ba is, for example, a half mirror, and a plurality of the deflection units 42Ba are arranged inside the light guide body 41B. The half mirror is disposed so as to be inclined so that the light reflected by the first surface 41Bb is perpendicularly incident on the first surface 41Bb. The half mirror here refers to a mirror capable of reflecting a part of light. That is, the half mirror does not necessarily have a light reflectance and transmittance of 1: 1. For example, the reflectance and transmittance may be 1: 9, or 2: 8. good. Moreover, the reflectance and the transmittance | permeability of each half mirror arrange | positioned inside the light guide main-body part 41B may differ.
　偏向部４２Ｂａが導光体本体部４１Ｂ内部に配置された上記導光体４０Ｂにおいても光を垂直に出射可能となるため、導光体４０Ｂを車体の車幅方向に配置することができる。言い換えると、第１～第２の面４１Ｂｂ、４１Ｂｃを車体の車幅方向に沿うように配置することができる。従って、実施例２による車両用表示装置１０Ｂにおいても、本発明は、所定の効果を得ることができる。 The light guide 40B can be arranged in the vehicle width direction of the vehicle body because the light can be emitted vertically also in the light guide 40B in which the deflection unit 42Ba is arranged in the light guide body 41B. In other words, the first and second surfaces 41Bb and 41Bc can be arranged along the vehicle width direction of the vehicle body. Therefore, also in the vehicle display device 10B according to the second embodiment, the present invention can obtain a predetermined effect.
　尚、本発明による車両用表示装置１０、１０Ａ、１０Ｂが搭載される車両Ｖｅは、四輪車の他、二輪車や三輪車であっても良い。 The vehicle Ve on which the vehicle display devices 10, 10A and 10B according to the present invention are mounted may be a two-wheeled vehicle or a three-wheeled vehicle other than a four-wheeled vehicle.
　また、実施例において示している第１～第２のミラー３１、３２は必須の構成要素ではない。つまり、これらを必要に応じて廃しても良い。また逆に、ミラーの枚数を必要に応じて増やすこともできる。ミラーの枚数を増やすことで、導光体４０、４０Ａ、４０Ｂに光が入射するまでにおける光路の自由度を高めることができる。 Also, the first and second mirrors 31 and 32 shown in the embodiment are not essential components. That is, you may abolish these as needed. Conversely, the number of mirrors can be increased as necessary. By increasing the number of mirrors, it is possible to increase the degree of freedom of the optical path until light enters the light guides 40, 40A, and 40B.
　更に、第１～第２の基材３１ａ、３２ａは、実施例において平板状の無機ガラスである例をもって説明されている。しかしながら、第１～第２の基材３１ａ、３２ａは、光を反射可能な金属膜を蒸着することができれば平板状の無機ガラスに限られない。即ち、第１～第２の基材３１ａ、３２ａは、例えば、アクリル樹脂やシクロオレフィンポリマー樹脂等であっても良い。 Furthermore, the first and second base materials 31a and 32a are described with an example of a flat inorganic glass in the embodiments. However, the first and second base materials 31a and 32a are not limited to a flat inorganic glass as long as a metal film capable of reflecting light can be deposited. That is, the first and second base materials 31a and 32a may be, for example, an acrylic resin or a cycloolefin polymer resin.
　また、第１～第２の反射部３１ｂ、３２ｂは、実施例において第１～第２の基材３１ａ、３２ａに蒸着されたアルミニウム等の金属膜である例をもって説明されている。しかしながら、第１～第２の反射部３１ｂ、３２ｂは、所定の波長帯域の光（可視光）のみを反射可能な多層膜であっても良い。即ち、第１～第２の反射部３１ｂ、３２ｂを有している第１のミラー３１及び第２のミラー３２が、コールドミラーであっても良い。 Further, the first and second reflecting portions 31b and 32b are described with an example of a metal film such as aluminum deposited on the first and second base materials 31a and 32a in the embodiment. However, the first and second reflecting portions 31b and 32b may be multilayer films that can reflect only light in a predetermined wavelength band (visible light). That is, the first mirror 31 and the second mirror 32 having the first and second reflecting portions 31b and 32b may be cold mirrors.
　更に、導光体４０、４０Ａ、４０Ｂは、実施例において無機ガラスである例をもって説明されている。しかしながら、導光体４０、４０Ａ、４０Ｂは、内部に光を入射可能な部材であれば無機ガラスに限られない。即ち、導光体４０、４０Ａ、４０Ｂは、例えば、透明な樹脂である、アクリル樹脂又はシクロオレフィンポリマー樹脂等であっても良い。 Furthermore, the light guides 40, 40A, and 40B are described with examples that are inorganic glass in the embodiments. However, the light guides 40, 40 </ b> A, and 40 </ b> B are not limited to inorganic glass as long as the light can be incident on the inside. That is, the light guides 40, 40A, and 40B may be, for example, an acrylic resin or a cycloolefin polymer resin that is a transparent resin.
　また、被投影部Ｗｓは、実施例においてフロントガラスＷｓとして説明されている。しかしながら、被投影部Ｗｓは、車両用表示装置１０、１０Ａ、１０Ｂから出射された光を投射することができるものであれば良く、フロントガラスＷｓに限られない。即ち、本発明は、いわゆるコンバイナを被投影部Ｗｓとした車両用表示装置１０、１０Ａ、１０Ｂにも適用することができる。 Further, the projection target part Ws is described as the windshield Ws in the embodiment. However, the projected part Ws is not limited to the windshield Ws as long as it can project the light emitted from the vehicle display devices 10, 10 </ b> A, and 10 </ b> B. That is, the present invention can also be applied to the vehicle display devices 10, 10 </ b> A, and 10 </ b> B that use a so-called combiner as the projection target portion Ws.
　即ち、本発明の作用及び効果を奏する限りにおいて、本発明は、実施例に限定されるものではない。 That is, the present invention is not limited to the examples as long as the operations and effects of the present invention are exhibited.
　本発明の車両用表示装置１０、１０Ａ、１０Ｂは、車両Ｖｅに搭載するのに好適である。 The vehicle display devices 10, 10A, and 10B of the present invention are suitable for being mounted on the vehicle Ve.
　１０、１０Ａ、１０Ｂ…車両用表示装置
　１１…表示手段
　１３…入射光補正部材
　２０…ケース
　３０…コリメート光学系
　３３、３３Ａ…コリメートレンズ（コリメートレンズ部）
　４０、４０Ａ、４０Ｂ…導光体
　４０ｂ、４０Ｂｂ…第１の面
　４１Ｂｃ、４２ｂ…第２の面
　４２ａ、４２Ｂａ…偏向部
　Ｉ…虚像（像）
　Ｍｎ…視認者（運転者）
　Ｖｅ…車両
　Ｗｓ…被投影部（フロントガラス） DESCRIPTION OF SYMBOLS 10, 10A, 10B ... Display apparatus for vehicles 11 ... Display means 13 ... Incident light correction member 20 ... Case 30 ... Collimating optical system 33, 33A ... Collimating lens (collimating lens part)
40, 40A, 40B ... light guides 40b, 40Bb ... first surface 41Bc, 42b ... second surface 42a, 42Ba ... deflection part I ... virtual image (image)
Mn ... Viewer (driver)
Ve ... Vehicle Ws ... Projected part (windshield)

Claims (4)

  1. 　車体の前部に設けられた被投影部に光を投射させ、前記被投影部に投射された光を虚像として視認者に認識させる車両用表示装置において、
    　光を出射可能な表示手段と、この表示手段から出射された光を平行光となるように通過させるコリメート光学系と、このコリメート光学系を通過した光が入射すると共に入射した光が互いに平行に設けられた第１の面及び第２の面を反射して進む導光体と、前記第１の面から出射された光が所定の方向に向かうよう補正する入射光補正部材と、を備え、
    　前記導光体は、前記第１の面及び前記第２の面が、共に前記車体の車幅方向に沿うように配置されていると共に、内部を通過する光を回折又は反射し前記第１の面から出射させる偏向部を含むことを特徴とする車両用表示装置。     In a vehicle display device that projects light onto a projection unit provided at a front portion of a vehicle body and causes a viewer to recognize the light projected on the projection unit as a virtual image,
    Display means capable of emitting light, collimating optical system for allowing the light emitted from the display means to pass in parallel light, and light that has passed through the collimating optical system are incident and the incident light is parallel to each other A light guide that reflects and travels by reflecting the first surface and the second surface provided; and an incident light correction member that corrects the light emitted from the first surface in a predetermined direction.
    The light guide is arranged such that the first surface and the second surface are both along the vehicle width direction of the vehicle body, and diffracts or reflects light passing through the first light guide. A vehicular display device comprising a deflecting portion for emitting light from a surface.
  2. 　前記コリメート光学系を通過し前記導光体の前記第１の面と前記第２の面へ入射する光の入射角は、前記第１の面及び前記第２の面に入射した光が全反射する最小の角度を臨界角とした場合に、この臨界角よりも大きい角度であることを特徴とする請求項１記載の車両用表示装置。 The incident angle of the light that passes through the collimating optical system and is incident on the first surface and the second surface of the light guide is totally reflected by the light incident on the first surface and the second surface. 2. The display device for a vehicle according to claim 1, wherein when the minimum angle is a critical angle, the angle is larger than the critical angle.
  3. 　前記コリメート光学系は、前記第１の面に光を入射させるように光を透過させるコリメートレンズを有し、
    　前記コリメートレンズは、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズであることを特徴とする請求項１又は請求項２記載の車両用表示装置。     The collimating optical system has a collimating lens that transmits light so that the light is incident on the first surface;
    3. The vehicle display device according to claim 1, wherein the collimating lens is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light emitting surface are formed substantially parallel to each other. .
  4. 　前記入射光補正部材は、光の入射する面及び光の出射する面が互いに略平行に形成された液晶ポリマーレンズ又はレンチキュラーレンズであることを特徴とする請求項１～３のいずれか１項記載の車両用表示装置。 4. The incident light correction member is a liquid crystal polymer lens or a lenticular lens in which a light incident surface and a light output surface are formed substantially parallel to each other. Vehicle display device.
PCT/JP2019/016781 2018-04-25 2019-04-19 Vehicle display device WO2019208424A1 (en)

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Citations (7)

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JPH0672185A (en) * 1992-06-26 1994-03-15 Yazaki Corp Display device for vehicle
US20100271698A1 (en) * 2009-04-24 2010-10-28 David Kessler Pupil-expanded volumetric display
JP2013045087A (en) * 2011-08-26 2013-03-04 Toshiba Corp Three-dimensional image display apparatus
JP2014215481A (en) * 2013-04-26 2014-11-17 日本精機株式会社 Head-up display device
JP2015001614A (en) * 2013-06-14 2015-01-05 株式会社ジャパンディスプレイ Display device
JP2015045808A (en) * 2013-08-29 2015-03-12 日本精機株式会社 Head-up display device
JP2015172713A (en) * 2014-03-12 2015-10-01 オリンパス株式会社 display device

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0672185A (en) * 1992-06-26 1994-03-15 Yazaki Corp Display device for vehicle
US20100271698A1 (en) * 2009-04-24 2010-10-28 David Kessler Pupil-expanded volumetric display
JP2013045087A (en) * 2011-08-26 2013-03-04 Toshiba Corp Three-dimensional image display apparatus
JP2014215481A (en) * 2013-04-26 2014-11-17 日本精機株式会社 Head-up display device
JP2015001614A (en) * 2013-06-14 2015-01-05 株式会社ジャパンディスプレイ Display device
JP2015045808A (en) * 2013-08-29 2015-03-12 日本精機株式会社 Head-up display device
JP2015172713A (en) * 2014-03-12 2015-10-01 オリンパス株式会社 display device

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