JP2000019643A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type display device which can be made compact. SOLUTION: In the projection type display device 1, a power source unit 7 being comparatively large among components is constituted of a first and a second smaller power source blocks 7A and 7B. Then, the blocks 7A and 7B are arranged so as to be mutually separated. Thus, since a dead space is hardly formed in the device 1 because the blocks 7A and 7B are efficiently arranged in the device 1, the device 1 can be made compact.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a projection display device, and more particularly to a power supply for supplying power for driving the device.

[0002]

2. Description of the Related Art Conventionally, a light source lamp as a light source, an optical system for optically processing a light beam emitted from the light source lamp to form an optical image corresponding to image information, and an optical system formed by the optical system 2. Description of the Related Art There is known a projection display apparatus including a projection lens for enlarging and projecting an image on a projection surface, a power supply for supplying power for driving the apparatus, and an outer case that covers substantially the entirety.

[0003] Such a projection display device is widely used for multimedia presentations at conferences, conferences, exhibitions and the like.

[0004]

In some cases, the projection type display device is maintained in a state where it is installed in a conference room for presentation, etc., but it is brought in if necessary, or when it is finished, it is placed in another place. May be transferred to and stored. Therefore, it is necessary to improve portability in order to facilitate carrying, and further downsizing is required.

[0005] It is an object of the present invention to provide a projection display device which can promote miniaturization.

[0006]

SUMMARY OF THE INVENTION The projection display apparatus of the present invention achieves the above object by effectively utilizing the space for arranging the components. An optical system that optically processes a light beam emitted from a light source to form an optical image according to image information, a projection lens that enlarges and projects an image formed by the optical system onto a projection surface, and a device driving device. A projection display device including a power supply for supplying power and an outer case that covers substantially the entirety of the power supply, wherein the power supply is configured by a plurality of power supply blocks arranged apart from each other. is there.

In the present invention, since a relatively large power supply is divided into a plurality of smaller power supply blocks among the components of the projection display apparatus, the power supply blocks are efficiently arranged inside the apparatus. Will be done. As a result, a dead space hardly occurs inside the device, and the size of the device can be reduced.

In the projection display device of the present invention, it is preferable that a plurality of power supply blocks are arranged at least on both sides of the projection lens.

In the projection display device of the present invention, one of the plurality of power supply blocks supplies power to the light source, and another power supply block different from the power supply block supplies power to a control circuit for controlling the optical system. May be supplied.

In the projection display device of the present invention, a plurality of power supply blocks may be provided with conductive cover members, and the cover members of each power supply block may be electrically connected to each other to be grounded.

In this case, it is preferable that the electrical connection between the cover members of each power supply block is made by a conductive bridging member bridging between at least an upper portion and a lower portion of each other.

Further, the straddling member may be attached to the inner surface of the outer case, and may be straddled between the cover members simultaneously with the assembling of the outer case. In such a case,
It is desirable to impart spring properties to a contact portion of the straddling member with the cover member.

[0013]

DETAILED 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 separates a light beam emitted from a light source lamp as a light source into three primary colors of red (R), green (G), and blue (B), and separates each of these color light beams into a liquid crystal light valve. (Modulation system), and modulates the modulated light flux of each color after modulation by a prism (color combining optical system), and enlarges and displays it on the projection surface via the projection lens 6. It is. Except for a part of the projection lens 6, each component is housed inside the outer case 2.

(2) Structure of Outer Case The outer case 2 is basically composed of an upper case 3 that covers the upper surface of the device, a lower case 4 that forms the bottom surface of the device, and a rear case 5 that covers the rear surface (FIG. 2). It is composed of

As shown in FIG. 1, the upper case 3
A large number of communication holes 25R and 25L are formed at the left and right ends on the front side of the upper surface of the. An operation switch 60 for adjusting the image quality and the like of the projection display device 1 is provided between the communication holes 25R and 25L. Further, a light receiving unit 70 for receiving an optical signal from a remote controller (not shown) is provided in a lower left portion of the upper case 3 as viewed from the front.

As shown in FIG. 2, the bottom of the lower case 4 has a lamp replacement lid 27 for replacing a light source lamp unit 8 (described later) housed therein, and an air for cooling the inside of the apparatus. An air filter cover 23 having an intake 240 is provided.

As shown in FIG. 2, on the bottom surface of the lower case 4, a foot 31C is provided at a substantially central portion of a front end thereof, and feet 31R and 31L are provided at left and right corners of a rear end. . The foot 31C is connected to the lever 3 shown in FIG.
11 is lifted upward to be rotated by the rotation mechanism 312 (FIG. 2) on the rear side, and biased to a state where the front side is separated from the apparatus main body and opened as shown by a two-dot chain line in FIG. Is done. The vertical position of the display screen on the projection plane can be changed by adjusting the amount of rotation. On the other hand, the feet 31R and 31L are configured to advance and retreat in the protruding direction by being rotated, and the inclination of the lower surface of the display can be changed by adjusting the amount of advance and retreat.

As shown in FIG. 2, an AC inlet 50 for supplying external power and various input / output terminal groups 51 are arranged in the rear case 5. An exhaust port 160 for discharging the air is formed.

(3) Internal Structure of the Device FIGS. 3 to 5 show the internal structure of the projection display device 1. FIG. 3 and 4 are schematic perspective views of the inside of the device, and FIG. 5 is a vertical sectional view of the projection display device 1.

As shown in these figures, a power supply unit 7 as a power supply, a light source lamp unit 8, an optical unit 10 constituting an optical system, a pair of upper and lower driver boards 11, a main board 12 are provided inside the outer case 2. And so on.

The power supply unit 7 includes first and second power supply blocks 7A and 7B disposed on both sides of the projection lens 6. The first power supply block 7A includes an AC inlet 5
It transforms the power obtained through zero and supplies it mainly to the second power supply block 7B and the light source lamp unit 8, and includes a transformer (transformer), a rectifier circuit, a smoothing circuit, a voltage stabilizing circuit, and the like. The second power supply block 7B
The electric power obtained from the power supply block 7B is further transformed and supplied, and like the first power supply block 7A, includes a transformer and various circuits. The power is supplied to the power supply circuit board 1 disposed below the optical unit 10.
3 (shown by a dotted line in FIG. 4) and each power supply block 7A,
7B, the first and second intake fans 17A, 1
7B. In the power supply circuit on the power supply circuit board 13, the power for driving the control circuit on the main board 12 is mainly generated based on the power from the second power supply block 7B, and the power for the other low power components is provided. It is producing electricity. Here, the second intake fan 17B is disposed between the second power supply block 7B and the projection lens 6, and cools through a gap formed between the projection lens 6 and the upper case 3 (FIG. 1). It is provided so that air is sucked into the inside from the outside. Each of the power supply blocks 7A and 7B is made of a conductive cover member 2 made of aluminum or the like.
50A, 250B, each cover member 250A, 25
0B, speakers 251R, 251 for audio output are provided at positions corresponding to the communication holes 25R, 25L of the upper case 3.
L is provided. These cover members 250A,
As shown in FIG. 6, the upper portions of 50B are mechanically and electrically connected to each other by a metal plate 252U having conductivity, and the lower portions are electrically connected to each other by a metal plate 252L (shown by a dotted line in FIG. 2). And is finally grounded through the GND (ground) line of the inlet 50. Of these metal plates 252U and 252L, the contact portions 2521 at both ends of the metal plate 252L are formed into a plurality of fins curved so as to protrude upward, and have a spring property. The metal plate 252L is fixed to the lower case 4 by fitting a fitting hole 2522 to a protrusion of the lower case 4 made of resin, and then crushing the protrusion by heat welding or the like. , 7B and the lower case 4 allow the contact portion 2521 to press the lower surfaces of the cover members 250A, 250B to make them conductive.

The light source lamp unit 8 constitutes a light source part of the projection display device 1, and includes a light source lamp 181.
And a light source device 183 including a reflector 182 and a lamp housing 184 that accommodates the light source device 183. Such a light source lamp unit 8 is covered with an accommodating portion 9021 formed integrally with the lower light guide 902 (FIG. 5), and is configured so that the above-described lamp replacement lid 27 can be opened and removed. Accommodation unit 902
1, a pair of exhaust fans 16 are provided side by side at a position corresponding to the exhaust port 160 of the rear case 5,
The cooling air sucked by the first to third intake fans 17 </ b> A to 17 </ b> C by the exhaust fans 16 is accommodated in the housing portion 902.
The cooling air is exhausted from the exhaust port 160 after the light source lamp unit 8 is cooled by the cooling air while being guided into the interior through an opening provided in the vicinity of the light source lamp unit 8. The power of each exhaust fan 16 is supplied to the power supply circuit board 13.
It is supplied from.

The optical unit 10 is a unit for optically processing a light beam emitted from the light source lamp unit 8 to form an optical image corresponding to image information, and includes an illumination optical system 923, a color separation optical system 924, It is configured to include a modulation system 925 and a prism unit 910 as a color combining optical system. Modulation system 925 and prism unit 91
The optical elements of the optical unit 10 other than “0” are vertically held between the 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 with fixing screws. Further, these light guides 901 and 902 are
Side is also fixed by a fixing screw.

As shown in FIG. 7, the prism unit 910 having a rectangular parallelepiped shape is fixed to the back surface of a head body 903, which is a substantially L-shaped side structure made of an integrally molded product of magnesium, with fixing screws. I have. The modulation system 92
5, each liquid crystal light valve 925R, 925G,
925B is disposed to face three side surfaces of the prism unit 910, and is similarly fixed to the head body 903 by fixing screws. It should be noted that the liquid crystal light valve 925B has a liquid crystal light valve 925 with the prism unit 910 interposed therebetween.
It is provided at a position facing R (FIG. 8), and FIG. 6 shows only the lead line (dotted line) and the sign. And
These liquid crystal light valves 925R, 925G, 925
B is a third intake fan 17C located on the lower surface of the head body 903 and provided corresponding to the above-described air intake 240.
Cooled by cooling air from At this time, the power of the third intake fan 17 </ b> C is supplied from the power supply circuit board 13 via the driver board 11. Further, on the front surface of the head body 903, the base end side of the projection lens 6 is similarly fixed by a fixing screw. The head body 903 on which the prism unit 910, the modulation system 925, and the projection lens 6 are mounted is fixed to the lower case 4 with fixing screws as shown in FIG.

The driver board 11 includes the liquid crystal light valves 925R, 925G, and 92 of the modulation system 925 described above.
5B, and is disposed above the optical unit 10. Further, the lower driver board 11A and the upper driver board 11B are separated via stud bolts 9011, and many elements (not shown) forming a control circuit are mounted on opposing surfaces of each other. That is, many of those elements are efficiently cooled by the cooling air flowing between the driver boards 11. The cooling air mainly sucked by the third intake fan 17C described above is used for the liquid crystal light valves 925R and 925.
After cooling G and 925B, they flow between the driver boards 11 through the opening of the upper light guide 901.

The main board 12 is provided with a control circuit for controlling the whole of the projection display device 1, and is provided upright beside the optical unit 10. Such a main board 12 is electrically connected to the driver board 11 and the operation switch 60, and further includes an input / output terminal group 5
1 is electrically connected to the interface board 14 and the video board 15 provided with the power supply circuit 1, and is connected to the power supply circuit board 13 via a connector or the like. The control circuit of the main board 12 is driven by power generated by the power supply circuit on the power supply circuit board 13, that is, power from the second power supply block 7B. The main board 12 is cooled by the second intake fan 17B from the second intake fan 17B.
This is performed by cooling air flowing through the power supply block 7B.

In FIG. 3, a guard member 19 made of metal such as aluminum is disposed between the main board 12 and the outer case 2 (only the lower case 4 and the rear case 5 are shown in FIG. 3). The guard member 19 has a large planar portion 191 extending over the upper and lower ends of the main board 12, the upper side is fixed to the cover member 250 </ b> B of the second power supply block 7 </ b> A with fixing screws 192, and the lower end is formed of the lower case 4. For example, the upper case 3 is engaged and supported by a slit. As a result, when the upper case 3 is attached to the lower case 4, interference between the upper case 3 (FIG. 1) and the main board 12 is prevented, and the main board 12 is protected from external noise. I have.

(4) Structure of Optical System Next, the optical system of the projection display device 1, that is, the optical unit 10
Will be described based on the schematic diagram shown in FIG.

As described above, the optical unit 10 includes the illumination optical system 923 for equalizing the in-plane illuminance distribution of the light beam (W) from the light source lamp unit 8, and the illumination optical system 923.
A color separation optical system 924 that separates the light beam (W) from the light into red (R), green (G), and blue (B), and a modulation system 925 that modulates each color light beam R, G, and B according to image information. And a prism unit 910 as a color combining optical system that combines the modulated light beams.

The illumination optical system 923 includes a reflection mirror 931 that bends the optical axis 1a of the light beam W emitted from the light source lamp unit 8 toward the front of the apparatus, and a first lens plate 921 that is disposed with the reflection mirror 931 interposed therebetween. And a second lens plate 922. The first lens plate 921 has a plurality of rectangular lenses arranged in a matrix, and divides a light beam emitted from a light source into a plurality of partial light beams. Then, each partial light beam is collected near the second lens plate 922.

The second lens plate 922 has a plurality of rectangular lenses arranged in a matrix, and converts each partial light beam emitted from the first lens plate 921 into a liquid crystal light valve constituting a modulation system 925. 925R, 925G, 925
B (described later).

As described above, in the projection display apparatus 1 of the present embodiment, the liquid crystal light valve 925 is
Since the R, 925G, and 925B can be illuminated with light having substantially uniform illuminance, a projection image without illuminance unevenness can be obtained.

The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 9.
42 and a reflection mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B included in the light beam W emitted from the illumination optical system 923 is used.
The green light flux G is reflected at a right angle, and travels toward the green reflection dichroic mirror 942.

The red light beam R passes through the blue-green reflecting dichroic mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the emission unit 944 of the red light beam R to the prism unit 910 side. Next, of the blue and green luminous fluxes B and G reflected by the blue-green reflecting dichroic mirror 941, the green reflecting dichroic mirror 94
In 2, only the green light flux G is reflected at a right angle, and is emitted from the emission unit 945 of the green light flux G to the prism unit 910 side. The blue light flux B that has passed through the green reflection dichroic mirror 942 is emitted from the emission section 946 of the blue light flux B to the light guide system 927 side. In this example, the emission portions 944, 945, and 94 of the respective color light beams R, G, and B in the color separation optical system 924 from the emission portion of the light beam W of the illumination optical system 923.
The distances to 6 are all set to be equal.

The red and green luminous flux R of the color separation optical system 924,
Condensing lenses 951 and 952 are arranged on the emission sides of the G emission sections 944 and 945, respectively. Therefore, the red and green light fluxes R and G emitted from the respective emission portions are incident on these condenser lenses 951 and 952 and are parallelized.

The red and green luminous fluxes R and G thus collimated pass through the incident-side polarizing plates 960R and 960G and enter the liquid crystal light valves 925R and 925G, where they are modulated, and image information corresponding to each color light is modulated. Will be added. That is, these liquid crystal light valves 925R and 925G are
Switching control is performed by the above-described driver board 11 in accordance with image information, whereby each color light passing therethrough is modulated. On the other hand, the blue light flux B is guided to the corresponding liquid crystal light valve 925B via the light guide system 927, where it is similarly modulated according to image information. Incidentally, the liquid crystal light valve 925R of the present embodiment,
925G and 925B are, for example, polysilicon T
A device using FT as a switching element can be employed.

The light guide system 927 is a light emitting section 94 for the blue light flux B.
6, a condenser lens 954 disposed on the exit side of the light-receiving element 6, an incident-side reflection mirror 971, an exit-side reflection mirror 972, an intermediate lens 973 disposed between these reflection mirrors, and disposed on the front side of the liquid crystal light valve 925B. Condensing lens 95
The blue light flux B emitted from the condenser lens 953 passes through the incident-side polarizing plate 960B, enters the liquid crystal light valve 925B, and is modulated. At this time, the optical axis 1a of the light beam W and the optical axis 1r of each color light beam R, B, B,
1g and 1b are formed in the same plane. The length of the optical path of each color light beam, that is, the light source lamp 181
The distance from to each liquid crystal panel is the longest for the blue luminous flux B, and therefore, the loss of light quantity of this luminous flux is greatest. However, by interposing the light guide system 927, the light amount loss can be suppressed.

Next, each liquid crystal light valve 925R, 92
R, G, and B light beams modulated through 5G and 925B, respectively.
Are incident on the prism unit 910 through the exit-side polarizing plates 961R, 961G, and 961B, and are synthesized there. The color image synthesized by the prism unit 910 is enlarged and projected on the projection surface 100 at a predetermined position via the projection lens 6.

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

In the projection display device 1, the relatively large power supply unit 7 among the components is composed of smaller first and second power supply blocks 7 A and 7 B, and these are arranged apart from each other. By efficiently arranging the power supply blocks 7A and 7B inside the device 1, a dead space can be hardly generated inside the device 1, and the size of the device 1 can be reduced.

Conventionally, the space on both sides of the projection lens 6 is too narrow to accommodate various components,
It was easy to become dead space. However, in the present embodiment, the power supply unit 7 includes the first and second power supply blocks 7A and 7A.
Since the power supply blocks 7A and 7B are configured with B, the power supply blocks 7A and 7B can be favorably arranged in such a narrow accommodation space, and the arrangement efficiency can be improved and the miniaturization can be more reliably promoted.

Further, the first and second power supply blocks 7 A,
By arranging the projection head 7B on both sides of the projection lens 6, the heavy head body 903 can be arranged almost at the center in the left-right direction to improve the weight balance of the apparatus 1, and the projection display apparatus 1 can be used as a tripod, for example. When fixed, it can be difficult to tilt.

The first power supply block 7A is mainly for the light source lamp 181 requiring a large power, and the second power supply block 7B is mainly for the control circuit driven by a small power. Can be easily and efficiently divided into each power level.

Further, the first power supply block 7 A is arranged at a position near the light source lamp 181 to which power is supplied,
The second power supply block 7B is a control circuit (main board 12)
Since it is arranged on the side, the electric circuit length between each of the power supply blocks 7A and 7B, the light source lamp 181, and the control circuit can be shortened. Therefore, the space required for routing cables and the like can be reduced, and the size of the device 1 can be reduced from this point as well.

In the first and second power supply blocks 7A and 7B, since the respective cover members 250A and 250B are electrically connected to each other, it is easy to make the reference levels of the voltages in the respective power supply blocks 7A and 7B easily match. As a result, generation of noise can be prevented.

Then, each of the cover members 250 A, 25
Since the upper and lower portions of OB are connected by metal plates 252U and 252L, respectively, the above-described grounding can be performed more reliably.

The lower metal plate 252L of the metal plates 252U and 252L is attached to the lower case 4 in advance, and the lower case 4 and each power supply block 7
A and 7B, each cover member 250A,
250B can be easily connected to each other, so that the assembling workability can be improved.

At this time, since the contact portion 2521 of the metal plate 252L is provided with a spring property, it can be reliably brought into contact with each of the cover members 250A and 250B. (6) Modifications 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.

For example, in the above embodiment, the cover members 250A, 250B of the power supply blocks 7A, 7B are electrically connected to each other by the upper metal plate 252U and the lower metal plate 252L. The upper metal plate is attached to the upper case 3 in advance, and the upper case 3 is attached to the lower case 4 and at the same time, the metal plate is attached to each cover member 25.
0A, 250B may be electrically connected to each other by making contact with the upper portions. Conversely, by laying the lower metal plate between the respective cover members 250A, 250B, the metal plates can be electrically connected to each other. May be connected.

The members connecting the upper and lower portions of the cover members 250A and 250B include plate-like members such as metal plates 252U and 252L,
It may be a wire-shaped member provided with connection terminals at both ends.

Further, the cover members 250A and 250B are connected to both the upper part and the lower part, and the case where either one is connected is included in the present invention.

In the above embodiment, the first power supply block 7A
Is provided to supply power to the second power supply block 7B and the light source lamp 181 and the second power supply block 7A is provided to supply the power to the driver board 11 and the main board 12 via the power supply circuit board 13. However, the present invention is not limited to this. The power to be supplied to each of the power supply blocks and the magnitude of the power generated by each of the power supply blocks are determined by the arrangement position of each component, or the power consumption. It may be arbitrarily determined in consideration of the above.

Each of the power supply blocks 7A and 7B is
However, in the projection display device of the present invention, the power supply blocks can be arranged at any positions by separating from each other. However, arranging them on both sides of the projection lens 6 is preferable because the effects described above can be obtained.

In the present invention, the power supply may be divided into two as in the case of the first and second power supply blocks, or may be divided into three as necessary. What is necessary is just to make it available effectively.

[0057]

As described above, according to the present invention,
Since a relatively large power supply is divided into a plurality of smaller power supply blocks among constituent components of the projection display apparatus, these power supply blocks can be efficiently arranged inside the apparatus. Therefore, there is an effect that a dead space can be hardly generated inside the apparatus, and the apparatus can be downsized.

[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 above.

FIG. 2 is an external perspective view of the projection display device according to the embodiment as viewed from below.

FIG. 3 is a perspective view illustrating an internal structure of the projection display device according to the embodiment.

FIG. 4 is a perspective view showing an optical system inside the projection display device in the embodiment.

FIG. 5 is a vertical sectional view showing the internal structure of the projection display device in the embodiment.

FIG. 6 is a perspective view showing a main part in the embodiment.

FIG. 7 illustrates a modulation system, a color combining optical system,
FIG. 2 is a vertical sectional view illustrating a structure on which a projection lens is mounted.

FIG. 8 is a schematic diagram for explaining a structure of an optical system of the projection display device according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Projection display apparatus 2 Exterior case 6 Projection lens 7 Power supply unit 7A 1st power supply block 7B 2nd power supply block 181 Light source lamp 250A, 250B as a light source Cover member 252U, 252L Metal plate 2521 as a straddling member Contact Department

Claims (7)

[Claims] 1. A light source, an optical system that optically processes a light beam emitted from the light source to form an optical image according to image information, and enlarges and projects an image formed by the optical system on a projection surface A projection lens, a power supply for supplying power for driving the apparatus, and an outer case that covers substantially the entirety of the projection lens, wherein the power supply includes a plurality of power supplies spaced apart from each other. A projection type display device comprising a block. 2. The projection display device according to claim 1, wherein said plurality of power supply blocks are arranged at least on both sides of said projection lens. 3. The projection display according to claim 1, wherein one of the plurality of power supply blocks is capable of supplying power to the light source, and is different from the power supply block. A power supply block capable of supplying power to a control circuit for controlling the optical system. 4. The projection display according to claim 1, wherein the plurality of power supply blocks are provided with a conductive cover member, and the cover members of the respective power supply blocks are electrically connected to each other. A projection display device which is connected and grounded. 5. The projection display device according to claim 4, wherein the electrical connection between the cover members of each of the power supply blocks is a straddle having conductivity that extends between at least an upper portion and a lower portion of each other. A projection-type display device, wherein the projection-type display device is performed by an installation member. 6. The projection display device according to claim 4, wherein the straddling member is attached to an inner surface of the outer case, and straddles between the cover members at the same time as the assembling of the outer case. A projection display device characterized by contacting with a touch panel. 7. The projection display device according to claim 6, wherein a contact portion of the straddling member with the cover member has a spring property.