JP2001005100A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which can be miniaturized. SOLUTION: This projection type display device is provided with an interlock switch 310 actuating in a direction difference from the opening/closing direction of a lamp exchanging cover 27 and changing over a state where the entire device can be energized to/from a state where it can not be energized. Therefore, the device is hardly influenced by the floating of the cover 27, so that the interlock switch need not be arranged near the fixed part 27A between the cover 27 and a projection type display device main body. Namely, the degree of freedom in terms of the arrangement of parts constituting the projection type display device is increased, so that the arranging efficiency of the parts in the projection type display device is improved. Therefore, wasteful space as before does not need and the miniturization of the projection type display device is promoted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection display apparatus provided with a switch for regulating power supply to the entire apparatus in conjunction with opening and closing of a light source replacement cover.

[0002]

2. Description of the Related Art Conventionally, a projection type including an electro-optical device for converting a light beam emitted from a light source into an optical image according to image information, and a projection lens for enlarging and projecting an image formed by the electro-optical device. Display devices are known. Such projection display devices are widely used for multimedia presentations at conferences, conferences, exhibitions, and the like.

In such a projection display device, a high-luminance lamp (for example, a halogen lamp) that emits a larger amount of light than a general-purpose incandescent lamp is used so that a projected image can be sufficiently viewed by a viewer. , Metal halide lamps and high-pressure mercury lamps). For this reason, while the projection display device is projecting an image, a large amount of power is supplied to the lamp, and a large amount of light and heat are dissipated by the supplied power. In the conventional projection display device, when the lamp is replaced with a new lamp due to the life of the lamp or the like, even if the power is turned on, power is not supplied to the lamp immediately after replacement and the entire device. Is provided with an interlock switch.

This interlock switch has a push switch that is linked to the opening and closing of the light source replacement cover. When the light source replacement cover is opened, the pressed state of the push switch is released, and power supply to the lamp and the entire device is cut off. Or
When the light source replacement cover is closed after the lamp replacement, the pressing switch is pressed, so that power can be supplied to the lamp and the entire device.

[0005]

In such an interlock switch, since the pressing direction of the pressing switch is the same as the opening and closing direction of the light source replacement cover, the light source attached to the projection display device main body. If the replacement lid is floating, the push switch may not operate correctly. For this reason, conventionally, in order to prevent the light source replacement cover from floating and to operate the interlock switch accurately, it is necessary to provide an interlock switch near the fixed portion between the projection display device main body and the light source replacement cover. Was. However, the position of the interlock switch is limited,
The arrangement positions of other components constituting the projection display device are also limited, and the component arrangement is biased. Therefore, the arrangement efficiency of components cannot be said to be good, for example, there is a useless space in the projection display device, and the miniaturization of the projection display device has been hindered.

SUMMARY OF THE INVENTION An object of the present invention is to provide a projection type display device which can improve the arrangement efficiency of components and can be downsized.

[0007]

SUMMARY OF THE INVENTION A projection display apparatus according to the present invention comprises an electro-optical device for converting a light beam emitted from a light source into an optical image according to image information, and an image formed by the electro-optical device. A projection-type display device including a projection lens for enlarging and projecting, wherein a light source exchange lid for inserting and removing the light source for replacement is provided, and power can be supplied to the entire device in conjunction with opening and closing of the light source exchange lid. A switch for switching between a normal state and a non-energizable state, wherein the switch operates in a direction different from the opening / closing direction of the light source exchange lid.

According to the present invention, since the switch operates in a direction different from the opening / closing direction of the light source replacement cover, the switch is less susceptible to the floating of the light source replacement cover and the like, and the light source replacement cover and the projection display device are not affected. There is no need to arrange an interlock switch near the fixed portion with the main body. For this reason, since the degree of freedom regarding the arrangement position of the switch, and thus the arrangement position of other components, is increased, the arrangement efficiency of the components in the projection display device is improved, so that the useless space which has conventionally occurred is eliminated. The miniaturization of the projection display device is promoted.

Here, it is preferable that the switch is disposed apart from the light source replacement cover, and that remote control means is provided between the switch and the light source replacement cover.

With this configuration, the switch is disposed not only around the light source replacement cover but also away from the light source replacement cover, so that the arrangement efficiency of components in the projection display device is further improved. .

In this case, it is preferable that the switch is disposed immediately below the projection lens.

Since the projection lens has a cylindrical shape, the space directly below the projection lens is viewed from the front of the projection lens.
It has a special shape that is narrow at the center and widens toward both sides. For this reason, parts that can be arranged are limited in the space of such an irregular shape, and this space usually tends to be a dead space (empty area). Therefore, by arranging the switches in such a dead space, the dead space in the projection display device can be effectively used, and the efficiency of arranging the components in the projection display device is improved.

Preferably, the remote control means is a rod-shaped member.

A rod-shaped member that has a simple structure and is easy to process,
The use of the remote control means reduces the cost of the projection display device including the remote control means.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

(1) Overall Configuration of the Apparatus FIGS. 1 and 2 are schematic perspective views of a projection display apparatus 1 according to the present embodiment. FIG. 1 is a perspective view as viewed from above, and FIG. It is the perspective view seen from the lower surface side.

The projection display device 1 converts a light beam emitted from a light source device as a light source into red (R), green (G), and blue (B).
These three primary colors are separated and modulated in accordance with image information through a liquid crystal panel constituting an electro-optical device, and the modulated light fluxes of the respective colors are combined by a cross dichroic prism (color combining optical system). In this case, the image is enlarged and displayed on the projection surface via the projection lens 6. Each component is housed inside the outer case 2, and the projection lens 6 is provided so as to be able to protrude from the outer case 2 as needed by its zoom mechanism.

The outer case 2 is basically composed of an upper case 3 covering the upper surface of the apparatus, a lower case 4 constituting the bottom of the apparatus, and a front case 5 covering the front part. 4 is made of magnesium die-cast, and the front case 5 is made of resin.

On the right side of the upper surface of the upper case 3 (right side when viewed from the front), an air inlet 240 covered with a filter replacement cover 241 made of resin is provided. The filter replacement lid 241 has a slit-shaped opening 241 for introducing air taken in from outside as cooling air into the apparatus.
A is formed, and inside the filter exchange lid 241,
An air filter 242 (FIG. 8) is provided. By attaching and detaching the filter exchange lid 241 from the upper surface side of the upper case 3, the internal air filter 242 can be exchanged.

Further, on the upper surface of the upper case 3,
A large number of communication holes 251 for the speaker 250 (FIG. 7) are formed in front of the filter replacement lid 241. An operation panel 60 for adjusting the image quality and the like of the projection display device 1 is provided beside the communication hole 251. As shown in FIG. 7 and FIG. 8, a portion where the filter replacement lid 241, the communication hole 251 and the operation panel 60 are provided is a bulging portion 3A where a part of the upper case 3 bulges upward. In the internal space formed by the bulging portion 3A, the air filter 242 and the speaker 25
0, a circuit board 61 for the operation panel 60 and the like are accommodated.

In FIG. 2, a lamp replacement cover 2 serving as a light source replacement cover for replacing a light source lamp unit 8 (FIGS. 3 and 4) housed in the lower case 4 is provided.
7 are provided. The lamp replacement cover 27 is for inserting and removing the light source lamp 181 from the projection display device 1 in order to replace the light source lamp 181.
It is fixed to the projection display device 1 main body by one screw 27A provided on the outer periphery. That is, the portion fixed by the screw 27A is a fixing portion between the lamp replacement lid 27 and the main body of the projection display 1. Also, as shown in FIGS. 10 and 12, the screw 17
A claw 27 </ b> B is formed on an end edge opposite to A to be locked to the bottom surface of the lower case 4.

The lower case 4 has feet 31R and 31L at the front corners on the bottom surface, and a foot 31C (not shown in the figure) at the center on the rear side. In addition, the feet 31R and 31L rotate the dial part,
By operating the levers 32R and 32L, it is configured to advance and retreat in the protruding direction. By adjusting the amount of advance and retreat, the height and inclination of the display screen can be changed.

A light receiving section 70 for receiving an optical signal from a remote controller (not shown) is provided on the right side of the front surface of the front case 5. At an approximate center of the front case 5, an exhaust port 160 for discharging air inside the apparatus is provided.

The air inlet 24 of such an outer case 2
On the side and back near zero, A for connection to an external power supply
A C inlet 50 and various input / output terminal groups 51 are arranged.

(2) Internal Structure of the Apparatus FIGS. 3 to 8 show the internal structure of the projection display apparatus 1. FIG. 3 is a schematic perspective view showing the inside of the apparatus, FIG. 4 is a perspective view showing an optical system, FIGS. 5 and 6 are perspective views showing the inside of the optical system,
7 and 8 are vertical sectional views of the projection display device 1. FIG.

In these figures, a light source lamp unit 8, a power supply unit 9 as a power supply, an optical unit 10, a driver board 11 (FIG. 8), a main board 12, an AV board 13 and the like are arranged inside the outer case 2. Have been. In the present embodiment, the light source lamp unit 8, the optical unit 10, and the projection lens 6 described above are used.
As a result, as shown in FIG.
The optical system is formed in the shape of a letter, and each of the boards 11, 12, 13
Constitutes a control system according to the present invention.

The power supply unit 9 includes a projection lens 6 of the optical system.
A first power supply block 9A disposed on the side of the side, a second power supply block 9B disposed in the central opening 14 of the flat U-shaped optical system, that is, between the projection lens 6 and the light source lamp unit 8. And a third power supply block 9C arranged on the side of the optical system on the light source lamp unit 8 side.

The first power supply block 9A includes the AC inlet 50, and supplies power from an external power supply obtained through the AC inlet 50 to the second power supply block 9B.
To supply.

The second power supply block 9B transforms the power obtained from the first power supply block 9B and supplies it mainly to the main board 12 and the third power supply block 9C constituting the control system. The exhaust port 16 of the second power supply block 9B
On the 0 side, an auxiliary exhaust fan 15 driven by electric power from the second power supply block 9B is attached.

The third power supply block 9C transforms the power obtained from the second power supply block 9B and supplies it to a light source device 183 (FIG. 9) as a light source in the light source lamp unit 8. That is, the third power supply block 9C needs to supply power to the light source device 183 having the largest power consumption.
It is larger than the first and second power supply blocks 9A and 9B, and has a size extending in front and rear of the device 1.

The first to third power supply blocks 9A to 9A
9C is fixed to the lower case 4 with screws or the like prior to the projection lens 6 and the optical unit 10. The first
The power supply block 9A may distribute power to the second power supply block 9B and the third power supply block 9C.

The light source lamp unit 8 constitutes a light source portion of the projection display device 1. As shown in FIG. 9, a light source device 183 comprising a light source lamp 181 and a concave mirror 182, and this light source device 183 And a lamp housing 184 for housing. Such a light source lamp unit 8 is covered with a housing portion 9021 integral with an upper light guide 901 constituting a light guide 900 described later, and is configured so that the above-described lamp replacement cover 27 can be opened and removed. A main exhaust fan 16 larger than the auxiliary exhaust fan 15 is disposed at a position corresponding to the exhaust port 160 in front of the housing portion 9021. The main exhaust fan 16 is also driven by the electric power from the second power supply block 9B.

The optical unit 10 is a unit for optically processing a light beam emitted from the light source lamp unit 8 and converting it into an optical image corresponding to image information, and includes a light guide 900. This light guide 900 is composed of an upper light guide 901 made of resin and made in a box shape, and a lower light guide 902 made of magnesium and made in a lid shape, and has an illumination optical system 923 and a color light separation optical system inside. 9
24, an electro-optical device 925 as a modulation system, and a cross dichroic prism 910 as a color combining optical system
Is housed. The lower light guide 902 is provided with a vertical head plate 903 to which the projection lens 6 is fixed. Optical elements of the optical unit 10 other than the electro-optical device 925 and the cross dichroic prism 910 are configured to be held between upper and lower light guides 901 and 902. The upper light guide 901 and the lower light guide 902 are integrated and fixed to the lower case 4 side.

The cross dichroic prism 910 is
On the back side of the head plate 903, the lower light guide 90
2 fixed on. Each of the liquid crystal panels 925R, 925G, and 925B constituting the electro-optical device 925 is disposed to face three sides of the cross dichroic prism 910, and is fixed to each side of the cross dichroic prism 910 by bonding. In addition, each liquid crystal panel 925R, 92
The positional relationship between 5G and 925B is based on the liquid crystal panel 925.
B and the liquid crystal panel 925R are provided at positions facing each other with the cross dichroic prism 910 interposed therebetween, and the liquid crystal panel 925G is provided at a position facing the projection lens 6 with the cross dichroic prism 910 interposed therebetween. Then, these liquid crystal panels 925R, 925G, 925
B is located above the cross dichroic prism 910 and is cooled by cooling air from the intake fan 17 provided corresponding to the aforementioned air intake 240.
At this time, electric power for driving the intake fan 17 is supplied from the main board 12 via the driver board 11.

The driver board 11 includes the liquid crystal panels 925R, 925G, and 92 of the above-described electro-optical device 925.
5B, and is disposed above the optical unit 10.

The main board 12 is provided with a control circuit for controlling the whole of the projection display device 1, and is provided upright behind the optical unit 10. Therefore, the main board 12 and the driver board 11 are arranged at right angles to each other and are electrically connected via the connector.

The AV board 13 includes the input / output terminal group 5 described above.
1 is a circuit board provided with the optical module 1 and is provided upright between the optical unit 10 and the main board 12 and is electrically connected to the main board 12.

In the above internal structure, the intake fan 1
After cooling the electro-optical device 925, the cooling air sucked in 7 is guided to the light source lamp unit 8 side while cooling the boards 11, 12, 13 by the rotation of the exhaust fans 15, 16. The cooling air is supplied to the lower case 4
The air flows mainly into the light source lamp unit 8 together with fresh cooling air from the suction hole 4A (FIG. 2) provided on the bottom surface of the light source unit 4 to cool the internal light source device 183. In addition, a part of the cooling air flows on the second power supply block 9B side, and another part flows on the third power supply block 9C side to cool the respective parts. Thereafter, the cooling air is exhausted from the exhaust port 160 to the front side of the apparatus 1 by the exhaust fans 15 and 16.

(3) Structure of Optical System Next, the optical unit 10 of the optical system will be described in detail.

As shown in FIGS. 5 and 9, the optical unit 10 includes an illumination optical system 923 housed in the upper light guide 901, a color light separation optical system 924,
A relay optical system 927 and a lower light guide 902, respectively.
, A cross dichroic prism 910 as a color light combining optical system, and the projection lens 6 fixed to the head plate 903 of the lower light guide 902.

The illumination optical system 923 includes an electro-optical device 925.
Is an integrator illumination optical system for illuminating the image forming areas of the three liquid crystal panels 925R, 925G, and 925B substantially uniformly. The light source device 183, the first lens array 921, and the second lens array 922 , A reflection mirror 931, and a superimposing lens 932. These lens arrays 921 and 922, the superimposing lens 932, and the reflection mirror 931 are arranged in a state of being supported by the rising portion of the upper light guide 901, and are fixed by the clip 7 as a falling-off prevention member. Even if the light guide 901 is inverted from the state shown in FIG. 3, it does not fall off.

The light source device 18 constituting the illumination optical system 923
Reference numeral 3 includes a light source lamp 181 as a radiation light source that emits a radial light beam, and a concave mirror 182 that emits the radiation light emitted from the light source lamp 181 as a substantially parallel light beam. As the light source lamp 181, a halogen lamp, a metal halide lamp, or a high-pressure mercury lamp is often used. As the concave mirror 182, it is preferable to use a parabolic mirror or an elliptical mirror.

The first lens array 921 has a configuration in which small lenses 9211 having a substantially rectangular outline are arranged in a matrix of M rows and N columns. Each small lens 9211
Divides a parallel light beam incident from a light source into a plurality of (ie, M × N) partial light beams, and forms an image of each of the partial light beams near the second lens array 922. Each small lens 92
The contour shape of the eleventh liquid crystal panel 925R, 925G,
925B is set to be substantially similar to the shape of the image forming area. For example, if the aspect ratio (the ratio between the horizontal and vertical dimensions) of the image forming area of the liquid crystal panel is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 922 also corresponds to the small lens 9211 of the first lens array 921.
It has a configuration in which small lenses 9221 are arranged in a matrix of M rows and N columns. The second lens array 922 has a function of aligning the central axes (principal rays) of the respective partial luminous fluxes emitted from the first lens array 921 so as to be perpendicularly incident on the incident surface of the superimposing lens 932. Here, the superimposing lens 932 converts the plurality of partial luminous fluxes into three liquid crystal panels 92.
It has a function of superimposing on 5R, 925G, and 925B. In addition, as shown in FIG. 5, the second lens array 922 is arranged at an angle of 90 degrees with respect to the first lens array 921 with the reflection mirror 931 interposed therebetween.

The reflection mirror 931 converts the light beam emitted from the first lens array 921 into a second lens array 922.
This is not necessarily required depending on the configuration of the illumination optical system 923. For example, the first lens array 921 and the light source are the second lens array 922
It is unnecessary if provided in parallel to

The color light separation optical system 924 includes two dichroic mirrors 941 and 94 as optical components according to the present invention.
42, and a reflection mirror 943, and an illumination optical system 923.
Has a function of separating light emitted from the superimposing lens 932 into three color lights of red, green, and blue. Each mirror 94
1, 942 and 943 are upper light guides 9 as described above.
01 and is fixed to the upper light guide 901 by the clip 7.

The relay optical system 927 includes an entrance side lens 95.
4. Relay lens 973 and reflection mirrors 971, 9
72, and these reflection mirrors 971, 972
Is also fixed to the upper light guide 901 by the clip 7.

Liquid crystal panel 925 of electro-optical device 925
R, 925G and 925B are, for example, polysilicon TF
T is used as a switching element. Each of the liquid crystal panels 925R, 925G, and 925B is disposed outside the upper light guide 901 and corresponding to the concave portion 904 (FIG. 5) provided on the outer periphery of the upper light guide 901. Cross dichroic prism 9 facing three sides
10 are adhered and fixed to opposing surfaces via fixing members. On the light incident / exit surface side of each liquid crystal panel 925R, 925G, 925B, the incident side polarizing plate 960R, 960G, 96
0B, on the light exit surface side, exit polarizers 961R, 961
G and 961B are arranged respectively.

The cross dichroic prism 910 is
It has a function of forming a color image by combining three color lights, and is fixed to the upper surface of the lower light guide 902 by a fixing screw. In the cross dichroic prism 910, a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light are formed in a substantially X shape along the interface of the four right-angle prisms. Three color lights are synthesized by the body multilayer film.

The projection lens 6 is the heaviest optical component in the projection display device 1, and is fixed to the head plate 903 of the lower light guide 902 by screws or the like via the flange 62 provided on the base end side. Have been.

The optical unit 10 configured as described above
Is assembled as follows.

First, a box-shaped upper light guide 901 is placed so that the opening side thereof faces upward, and an illumination optical system 923 and a color light separation optical system 92 are provided in the upper light guide 901.
The optical components (reflection mirrors, various lenses, etc.) that configure the relay optical system 927 and the like are arranged, and these optical components are fixed to the upper light guide 901 with the clip 7.

On the other hand, in the lid-shaped lower light guide 902, the liquid crystal panels 925R, 925G, 92
The cross dichroic prism 910 to which 5B is fixed is fixed, and the projection lens 6 is fixed to the head plate 903.

Next, the upper light guide 901 on which each optical component is mounted is turned upside down, and attached and fixed so as to cover the lower light guide 902.

Finally, the light guide 900 thus completed is fixed to the lower case 4 with screws or the like.

The liquid crystal panels 925R, 925G, 9
25B, the lower light guide 902 on which the cross dichroic prism 910 and the projection lens 6 are mounted is fixed to the lower case 4 first, and then the upper light guide 901 on which each optical component is mounted is inverted. The upper light guide 901 may be fixed to the lower case 4 with screws or the like after being attached so as to cover the lower light guide 902.

Further, only the lower light guide 902 is screwed to the lower case 4 first, and the liquid crystal panels 925R, 925G, 925B and the cross dichroic prism 910 are mounted thereon, and the projection lens 6 is fixed. Then, the upper light guide 901 on which each optical component is mounted is turned upside down, and attached so as to cover the lower light guide 902. Thereafter, the upper light guide 901 is fixed to the lower case 4 with screws or the like. It may be.

In this embodiment, the fixing of the cross dichroic prism 910 and the projection lens 6 to the lower light guide 902 and the fixing of the upper and lower light guides 901 and 902 to the lower case 4 are performed by screws. Such fixing may be performed by another appropriate fixing method such as bonding or fitting.

(4) Function of Optical System In the optical unit 10 shown in FIG.
The substantially parallel luminous flux emitted from is divided into a plurality of partial luminous fluxes by first and second lens arrays 921 and 922 constituting an integrator optical system (illumination optical system 923). Each small lens 9211 of the first lens array 921
Are partially superimposed on the image forming areas of the liquid crystal panels 925R, 925G, and 925B by the superimposing lens 932. As a result, each liquid crystal panel 9
25R, 925G, and 925B are illuminated with illumination light having a substantially uniform in-plane distribution.

At this time, the first dichroic mirror 941 of the color light separation optical system 924 reflects the red light component of the light beam emitted from the illumination optical system 923 and transmits the blue light component and the green light component. The red light reflected by the first dichroic mirror 941 is reflected by the reflection mirror 943, passes through the field lens 951, and reaches the liquid crystal panel 925R for red. This field lens 951 converts each partial light beam emitted from the second lens array 922 into a light beam parallel to its central axis (principal ray). The same applies to the field lenses 952 and 953 provided in front of the other liquid crystal panels 925G and 925B.

Of the blue light and the green light transmitted through the first dichroic mirror 941, the green light is reflected by the second dichroic mirror 942, reaches the liquid crystal panel 925G for green through the field lens 952.
On the other hand, the blue light passes through the second dichroic mirror 942, passes through the relay optical system 927, and further reaches the liquid crystal panel 925B for blue light through the field lens 953. The reason why the relay optical system 927 is used for blue light is that the optical path length of the blue light is longer than the optical path lengths of other color lights, thereby preventing a decrease in light use efficiency due to light diffusion or the like. To do that. That is, the incident side lens 954
The partial light beam incident on the
3

The red, green, and blue light components are transmitted to a liquid crystal panel 925.
R, 925G, and 925B are incident on the incident-side polarizers 960R, 960G, and 960B, and are converted into only specific polarized light. Thereafter, each polarized light is applied to each liquid crystal panel 925.
R, 925G and 925B are modulated according to the image information given thereto, and output-side polarizing plates 961R as modulated light.
The light is emitted to 961G and 961B. Then, in the output-side polarizing plates 961R, 961G, and 961B, only specific polarized light of the modulated light is transmitted and output to the cross dichroic prism 910. The emitted polarized lights of the respective color lights are combined by the cross dichroic prism 910 to be combined light, and emitted in the direction of the projection lens 6.
This combined light is projected as a color image on a projection surface such as a projection screen by the projection lens 6.

(5) On / Off Mechanism by Interlock Switch As shown in FIGS. 7 and 10, the power supply to the device 1 is cut off (locked, etc.) at the bottom of the projection display device 1 as described above. ), Resume (unlock)
An on / off mechanism 300 is provided.

The on / off mechanism 300 includes a projection lens 6
An interlock switch 310 disposed immediately below the
The interlock switch 310 and the lever 320 as remote operation means for connecting the lamp replacement lid 27 are configured.

The interlock switch 310 is a switching mechanism that switches between a state in which power can be supplied to the entire apparatus and a state in which power cannot be supplied in response to opening and closing of the lamp replacement lid 27, and includes a push switch 311. That is,
The push switch 311 includes a spring (not shown). Normally, when the lamp replacement lid 27 is fitted in the lower case 4, the push switch 311 is pushed by the lever 320, and the first power supply block 9A and the second power supply The block 9B is electrically connected. In the state where the lamp replacement lid 27 is removed from the lower case 4,
The press switch 311 is urged toward the lever 320 by a spring, and the terminals are separated from each other and are electrically disconnected.

The lever 320 is a rod-shaped member provided between the lamp replacement lid 27 and the interlock switch 310. As shown in FIG. 10, the lever 320 is elongated by a screw inserted into a long hole formed in the center portion. It is attached to the lower case 4 such that it can move forward and backward. One end of the lever 320 is in contact with the claw 27B on the edge of the lamp replacement lid 27, and the other end is in contact with the pressing switch 311 of the interlock switch 310.

The on / off mechanism 30 having such a configuration
At 0, the power supply to the light source lamp 181 and the apparatus main body is turned on and off in accordance with the opening and closing of the lamp replacement cover 27 as described below.

That is, as shown in FIG. 12A, in a normal state where the lamp replacement cover 27 is fitted in the lower case 4, the claw 27B of the lamp replacement cover 27
Via a lever 320, an interlock switch 310
Is pressed. Therefore, in the interlock switch 310, the first power supply block 9A
Is connected to the wiring of the second power supply block 9B, and the light source lamp 181 and the apparatus main body are energized.

As shown in FIG. 12B, the lamp replacement cover 27 is positioned below the lower case 4 (see arrow D).
When the push switch 311 is removed, the push switch 311 is protruded toward the lever 320 (see arrow L) by the elastic force of the spring.
1 and the power supply to the apparatus main body are turned off (cut off).

(6) Effects of Embodiment According to this embodiment, the following effects can be obtained.

First, the interlock switch 310 which operates the projection display device 1 in a direction different from the opening / closing direction of the lamp replacement lid 27 to switch between a state in which power can be supplied to the entire device and a state in which power cannot be supplied thereto. Is provided. For this reason, the lamp replacement lid 27 is less likely to be affected by the lifting, and the need to dispose the interlock switch 310 near the fixed portion between the lamp replacement lid 27 and the main body of the projection display 1 is eliminated. Therefore, the degree of freedom with respect to the arrangement position of the interlock switch 310 and, consequently, the arrangement of other components is increased, and the efficiency of arranging the components in the projection display device 1 is improved. As a result, the size of the projection display device 1 is reduced.

The interlock switch 310 is
The lamp replacement cover 27 is disposed apart from the position of the screw 27A, and a lever 320 is provided between the interlock switch 310 and the lamp replacement cover 27. The lamp replacement cover 27 can be disposed apart from the periphery of the lamp replacement cover 27. Therefore, the degree of freedom in arranging other components arranged in the projection display device 1 increases, and the projection display device 1
It is possible to further improve the efficiency of arranging components in the interior.

Further, the interlock switch 310
Is disposed directly below the projection lens 6, which has conventionally been a dead space, so that the empty space of the projection display device 1 can be reduced, and the efficiency of arranging components in the projection display device 1 can be increased.

Since the rod-like lever 320, which has a simple structure and is easy to process, is used as a remote control means between the lamp replacement lid 27 and the interlock switch 310, if this lever 320 is included, a projection type The cost of the display device 1 can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, but includes other configurations that can achieve the object of the present invention, and the following modifications are also included in the present invention.

That is, in the above-described embodiment, the rod-like member such as the lever 320 is used as the remote control means. However, the present invention is not limited to this. For example, the remote control means may be a link mechanism that converts a movement in the opening and closing direction (see arrow D) of the lamp replacement lid 27 into a movement in a direction different from this direction.

In the above embodiment, the interlock switch 310 is disposed immediately below the projection lens 6, but the present invention is not limited to this. That is, the projection type display device 1 is used as a space for disposing the interlock switch 310.
The small space created between other components located within may be utilized.

Further, in the above embodiment, the lever 320
, The lamp replacement lid 27 and the interlock switch 310 are separated from each other, but this is not a limitation. For example,
The claw 27B of the lamp replacement lid 27 may directly contact the pressing switch 311 of the interlock switch 310. In this case, the lever 320 becomes unnecessary, and the number of parts can be reduced.

In the above-described embodiment, the operation direction of the interlock switch 310 is orthogonal to the direction in which the lamp replacement cover 27 is removed (see the arrow D) along the bottom surface of the lower case 4. It is not limited to this direction.
In short, the direction in which the lamp replacement lid 27 is removed (see arrow D) may be different.

Further, in the above-described embodiment, the interlock switch 310 having the built-in push switch 311 is used as a switch for switching the energized state of the projection display apparatus 1 between an energized state and a non-energized state. Such a switching mechanism is not limited to the interlock switch 310.

For example, the open / close state of the lamp replacement lid 27
The switching mechanism for converting the contact state between the movable electrode and the fixed electrode into a contact / non-contact state may be a blade contact type switching mechanism, a plug type switching mechanism, or the like. In short, a switching mechanism other than the interlock switch 310 may be used as long as the switching mechanism converts the open / closed state of the lamp replacement lid 27 into a state where power can be supplied to the projection display apparatus 1 and a state where power cannot be supplied.

In the above embodiment, the electro-optical device 9
Reference numeral 25 denotes three liquid crystal panels 925R, 925G, and 925.
However, the present invention is not limited to this, and the present invention may be applied to a light modulator including one or two liquid crystal panels.

In the above-described embodiment, the panel constituting the electro-optical device 925 is composed of a liquid crystal element. However, the panel is provided with a light modulation device composed of a plasma element other than liquid crystal and a device panel using a micromirror. The present invention may be applied to such a projection display device.

Further, the electro-optical device 925 in the above embodiment is of a type in which light fluxes R, G, and B are transmitted and modulated. However, the present invention is not limited to this. The present invention may be applied to a projection display device including a reflection-type light modulation device that emits light.

[0085]

As described above, in the projection type display device of the present invention, the lamp replacement cover operates in a direction different from the opening / closing direction, so that the entire projection type display device can be energized and de-energized. An interlock switch for switching between possible states is provided. For this reason, the lamp replacement lid is less likely to be affected by the lift, and the need to dispose an interlock switch near the fixed portion between the lamp replacement lid and the projection display device main body is eliminated. Therefore, the degree of freedom with respect to the arrangement position of the interlock switch, and thus the arrangement of other components, is increased, and the efficiency of arranging the components in the projection display device is improved. The miniaturization of the projection display device is promoted.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a projection display device according to an embodiment of the present invention as viewed from a top surface side.

FIG. 2 is an external perspective view of the projection display device as viewed from a lower surface side.

FIG. 3 is a perspective view showing an internal structure of the projection display device.

FIG. 4 is a perspective view showing an optical system of the projection display device.

FIG. 5 is a perspective view showing the structure of the optical system.

FIG. 6 is another perspective view showing the structure of the optical system.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 1, and is a vertical cross-sectional view of the projection display device.

8 is a cross-sectional view taken along line VIII-VIII in FIG. 7, and is another vertical cross-sectional view of the projection display device.

FIG. 9 is a schematic diagram for explaining functions of the optical system.

FIG. 10 is a perspective view showing a structure of a bottom portion of the projection display device.

FIG. 11 is a perspective view of a structure around a light source lamp of the projection display device as viewed from the back.

FIG. 12 is a cross-sectional view showing an operation of an on / off mechanism of the projection display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection display apparatus 6 Projection lens 27 Lamp replacement cover 181 Light source lamp 300 ON / OFF mechanism 310 Interlock switch 320 Lever which is a remote control means 925 Electro-optical device 925R, 925G, 925B Liquid crystal panel which is one of the electro-optical devices

Claims (4)

[Claims] An electro-optical device for converting a light beam emitted from a light source into an optical image according to image information, and a projection lens for enlarging and projecting an image formed by the electro-optical device. A light source exchange lid for taking in and out to exchange the light source is provided, and a switch for switching between an energizable state and a non-energizable state to the entire apparatus in conjunction with opening and closing of the light source exchange lid. The projection display device, wherein the switch is operated in a direction different from an opening / closing direction of the light source replacement cover. 2. The projection display device according to claim 1, wherein the switch is disposed apart from the light source replacement cover, and a remote operation unit is provided between the switch and the light source replacement cover. Is provided, and a projection display device. 3. The projection display device according to claim 1, wherein the switch is disposed immediately below the projection lens. 4. The projection display device according to claim 2, wherein said remote control means is a rod-shaped member.