JP2003274318A - Rear projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear projector which can avoid mutual interference due to electromagnetic radiation between members constituting the rear projector stored in a housing and improve recyclability of the housing. <P>SOLUTION: A metallic base member 201 which constitutes an internal unit 40 is connected to the ground and a support member 200 is held at the ground potential on the whole. A shield member 403 of a control board 402 is fixed to column members 204A and 204B projected from the top surface of the support member 200 and shield members of a first power unit 301 and a second power unit 302 are fixed to the top surface of the base member 201, respectively. In this configuration, the respective shield members are electrically connected to the support member 200 and held at the same potential as that of the support member 200. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electro-optical device that modulates a light beam emitted from a light source to form an optical image according to image information, and an image forming including a projection optical system that magnifies and projects the optical image. Section, a box-shaped housing for accommodating the image forming section, and a screen that is exposed on either side of the box-shaped housing and projects the optical image formed by the image forming section. Relates to a rear projector equipped with.

[0002]

2. Description of the Related Art Conventionally, as a display device having a large screen, a rear projector for enlarging and projecting an image on the screen for display is known. Generally, such a rear projector has an image forming unit that forms a projected image, a box-shaped housing that houses the image forming unit and a reflection mirror that reflects the projected image, and is exposed on the box-shaped side surface of the housing. It is configured by including a transmissive screen provided. Among these, the image forming unit includes a drive circuit for driving the light source, a control board for controlling the liquid crystal panel, and a power supply for supplying electric power to the drive circuit and the control board.

This control board is mounted with a CPU or the like for performing control / arithmetic processing and controls the liquid crystal panel in accordance with an image signal input from the outside. Such CPUs and memories consume current intermittently at high frequencies,
Such a high-frequency current fluctuation causes strong radiation of electromagnetic waves. Further, the power supply / driving circuit has a transformer or the like that transforms electric power input from the outside into predetermined electric power,
Strong electromagnetic radiation also occurs from these electronic components such as the power supply / driving circuit. In order to avoid electromagnetic interference to other electronic devices outside the rear projection display device due to this electromagnetic radiation, a resin that houses an image forming unit composed of the liquid crystal panel and the projection lens, a reflection mirror, a screen, etc. The inner surface of the case made of Ni is plated with Ni or conductive coating to shield electromagnetic waves from the rear projector to the outside.

[0004]

However, as described above, when the inner surface of the housing made of resin is plated with Ni or conductive coating, electromagnetic waves from the rear projector to the outside can be shielded. There is a problem that it is impossible to prevent mutual interference of electromagnetic radiation in a control board, a drive circuit, a power supply, etc. housed in the body. Further, there is a problem in that, when Ni plating or conductive coating is applied to the inner surface of the housing, the housing cannot be reused.

An object of the present invention is to provide a rear projector capable of avoiding mutual interference due to electromagnetic radiation between the members constituting the rear projector housed in the housing and improving the recyclability of the housing. It is in.

[0006]

SUMMARY OF THE INVENTION A rear projector of the present invention is an electro-optical device that modulates a light beam emitted from a light source to form an optical image according to image information, and a projection optical system that magnifies and projects the optical image. An image forming unit including a system, a box-shaped housing for accommodating the image forming unit, and an optical image formed by the image forming unit exposed on one side surface of the box-shaped housing. A rear projector including a screen for projecting light, wherein the image forming unit supplies a drive circuit that drives the light source, a control board that controls the electro-optical device, and power to the drive circuit and the control board. A power supply, and a base made of an electrically conductive material that supports the image forming unit, the drive circuit, the control board, and a metal shield member that covers the outer periphery of the power supply,
The base is set to a ground potential, and the shield member is connected to the base.

According to the present invention as described above, the image forming unit includes the drive circuit, the control board, and the power supply, and the outer circumferences of the drive circuit, the control board, and the power supply are covered by the shield member. It is possible to shield electromagnetic radiation from the drive circuit, the control board, and the power supply even in a state in which the body is not provided with measures against interference with external equipment due to electromagnetic radiation such as Ni or conductive coating. Further, since the shield members are installed in each of the drive circuit, the control board, and the power source, it is possible to prevent mutual interference due to electromagnetic waves among the members. In addition, Ni
Alternatively, since it is not necessary to apply conductive coating or the like and a resin casing that transmits electromagnetic waves can be used, the recyclability of the casing can be improved.

Further, the rear projector has a base,
Since the base is set to the ground potential and the shield member is connected to the base, each shield member can be connected as a single-point ground and is installed in each of the drive circuit, the control board, and the power supply. The ground potential of the shield member can be made the same as the ground potential of the base, and mutual interference between the respective members due to fluctuations in the ground potential of individual members can be suppressed.

In the rear projector of the present invention, the casing is provided with a supporting member that is provided inside the casing and bears a part of the supporting load. The supporting member is set to the ground potential and the base is mounted. It is preferable that they are brought into contact with and electrically connected. In such a configuration, the housing is provided with a supporting member, and the supporting member is set to the ground potential, and the supporting member is brought into contact with the base and electrically connected to the supporting member so that the supporting member is set to the ground potential. If it is connected to the base at multiple points, it is possible to suppress the fluctuation of the ground potential of the base or the potential distribution in the base and suppress the fluctuation and difference of the ground potential of the shield member. Electromagnetic radiation from the control board, the control board, and the power supply can be efficiently shielded.

In the rear projector of the present invention, on the opposite side of the supporting surface of the image forming portion of the base, a slide for sliding the base from the housing to expose the image forming portion to the outside of the housing. A mechanism is preferably provided. Usually, the image forming part is repaired due to damage or failure,
When the replacement or the like is required, the housing is disassembled, the constituent members such as the reflection mirror and the screen are removed, and the repair, replacement and the like are performed with the image forming unit exposed from the housing. Therefore, when repairing or replacing the work, the work becomes very complicated and the work efficiency is deteriorated.

In this case, since the base is provided with the slide mechanism, the base for supporting the image forming unit when the image forming unit needs to be repaired or replaced due to damage or failure. The image forming unit can be repaired or replaced by sliding the to the outside of the housing by sliding it from the housing. Therefore, at the time of repair or replacement, the disassembling of the housing, the removal work of the reflection mirror, the screen and the like can be omitted, and the work can be easily performed, and the work efficiency can be improved. Further, with such a configuration, the work efficiency can be improved not only in the repair and replacement work but also in the inspection and evaluation at the time of assembling the rear projection display device.

Here, as the slide mechanism, members such as casters are installed on the surface opposite to the support surface of the base,
It is possible to employ a mechanism in which the caster is brought into contact with the bottom surface of the housing and the base is slid with respect to the bottom surface of the housing. In addition, a linear rail hole is formed on the bottom surface of the housing, and a linear rail protruding from the surface is provided on the surface opposite to the support surface of the base, and the rail and the rail hole are engaged with each other. By doing so, a mechanism for slidingly moving the base with respect to the bottom surface of the housing may be adopted.

In the rear projector of the present invention, the image forming section has an optical system including the light source and the electro-optical device, and the control board, the drive circuit and the power source sandwich the optical system. It is preferable that they are arranged to face each other. In recent years, due to the improved performance of rear projectors,
The brightness of the light source is increased, and the power supplied to the light source is increased with the increase in the brightness, and electromagnetic waves that cause electromagnetic interference are easily radiated from the drive circuit and the power source. In particular,
The control board includes an IC for controlling the electro-optical device,
Circuit elements such as LSIs are mounted at high density, and are easily affected by noise interference by the electromagnetic waves emitted from the drive circuit and the power source.

Here, the image forming section has an optical system including a light source and an electro-optical device, and the control board, the drive circuit and the power source are arranged to face each other with the optical system interposed therebetween, thereby controlling If the optical system sandwiched between the board and the drive circuit and the power supply is housed in a metal housing, it is possible to shield the drive circuit and the power supply from electromagnetic waves from the power supply to the control board. The shield structure need not be provided so as to cover the outer periphery of each member of the power supply and the control board, and the shield structure can be further simplified. Therefore, the rear projector can be prevented from increasing due to the shield structure, and the rear projector can be downsized. Further, since the electromagnetic waves radiated from the drive circuit and the power source can be shielded by the optical system, the electromagnetic waves radiated from the drive circuit and the power source are not taken into the control board, and the disturbance of the projected image and the malfunction can be avoided. can do.

In the rear projector of the present invention, it is preferable that the power source and the control board are electrically connected via a printed wiring board. Usually, the power supply and the control board are electrically connected by a cable, and a predetermined power is supplied from the power supply to the control board. In the power supply in this cable, a voltage drop occurs due to the cable impedance and a predetermined power cannot be supplied from the power supply to the control board, and it is necessary to supply the power in consideration of the cable impedance from the power supply.

In such a configuration, since the power supply and the control board are electrically connected via the printed wiring board, the electric power supplied from the power supply suppresses the power loss during transmission, and the power supply is controlled to a predetermined level. By supplying the electric power of, it is possible to stably control the electro-optical device and the like on the control board. Further, by forming the ground pattern on the printed wiring board, the shield effect of the wiring can be enhanced, the influence of electromagnetic radiation from the power supply or the drive circuit on the wiring can be avoided, and the control on the control board can be stably performed. .

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. [1. Main Configuration of Rear Projector] FIG. 1 is a perspective view of a rear projector 1 according to the present invention as seen from the front.
FIG. 2 is a perspective view of the rear projector 1 as viewed from the rear. FIG. 3 is an exploded perspective view of the rear projector 1 seen from the rear, and specifically, the back cover 1 from FIG.
FIG. 4 is a view with 4 removed. FIG. 4 is an exploded perspective view of the rear projector 1 seen from below. FIG. 5 is a vertical cross-sectional view showing the rear projector 1.

Regarding the main configuration of the rear projector 1,
This will be described with reference to FIGS. The rear projector 1
As shown in FIGS. 1 to 5, a light beam emitted from a light source is modulated in accordance with image information to form an optical image, and the optical image is enlarged and projected on a screen. 10, a leg portion 20 provided on the lower surface side of the cabinet 10, an internal unit 40 as an image forming portion arranged in the cabinet 10, a reflection mirror 30 also arranged in the cabinet 10, and a cabinet 10 of the cabinet 10. Screen 50 exposed on the front surface
And is configured. These cabinet 10, internal unit 40, reflection mirror 30, and screen 5
The device main body is constituted by 0. In the present embodiment, for convenience, the left side when viewed from the front is the left and the right side when viewed from the front is the right.

The cabinet 10 is a housing made of synthetic resin for accommodating the internal unit 40 and the reflection mirror 30, and as shown in FIG. The lower cabinet 13 having a U-shaped vertical cross section that covers most of the sides, the back cover 14 that partially covers the rear side and the left and right side surfaces, and the upper cabinet 12 having a triangular cross section that is installed above the lower cabinet 13. And is configured. The dimension of the lower cabinet 13 in the left-right direction as a direction along the surface of the screen 50 is the upper cabinet 1.
2 is formed to be smaller than the dimension in the left-right direction as the direction along the surface of the screen 50. Further, the back cover 14 is configured to be detachable from the lower cabinet 13.

As shown in FIG. 4, the lower cabinet 13 includes a front surface portion 131, left and right side surface portions 132, and an upper surface portion 1.
33 and a lower surface portion 134. As shown in FIG.
In the lower cabinet 13, a center portion 131A that bulges toward the front side in accordance with the amount of projection of the projection lens that constitutes the internal unit 40 is provided substantially at the center of the front surface portion 131, and on the left and right sides of this center portion 131A. , Rectangular opening portions 131R and 131L having substantially the same dimensions are formed.
In these openings 131R and 131L, the woofer box 60 (60
R, 60L) are attached respectively. These woofer boxes 60R, 60L have openings 131R,
It can be attached to and detached from the front side of the 131L. Although not clearly shown in the drawing, the left opening 13
On the lower side of 1L, there are provided a connecting portion for connecting a computer and various equipment connecting terminals such as a video input terminal and an audio equipment connecting terminal.

Further, in the lower cabinet 13, as shown in FIG. 3, left and right side surface portions 132 are respectively formed with slit-shaped openings. The opening on the left is
An intake opening 132L for introducing cooling air into the inside,
The opening on the right side is an exhaust opening 132R for discharging the air introduced into the inside and cooling the inside.

The upper surface portion 133 is constructed to face a lower surface portion of the upper cabinet 12 which will be described later. Further, the lower surface portion 134 is arranged so as to abut a receiving surface of the leg portion 20 which will be described later.

The back cover 14 is, as shown in FIG.
It is configured by including a back surface portion 141 and left and right side surface portions 142. In the back cover 14, a second intake opening 141A for introducing cooling air is formed on the right side (the left side when viewed from the rear) of the back surface part 141. An air filter 143 is attached to the second intake opening 141A. The second intake opening 141A provided with the air filter 143 has a cover 144 that closes the opening 141A.
Is detachably attached. In addition, the back surface part 141
An opening for the inlet connector 145 is provided on the left side (the right side when viewed from the rear) of the second intake opening 141A in the above. Further, on the left side (the right side when viewed from the rear) of the back surface part 141, there are provided a connection part for connecting a computer and various device connection terminals such as a video input terminal and an audio device connection terminal. An interface board 80 is provided inside the.

The upper cabinet 12 is shown in FIGS.
Referring to FIG. 1, there is shown a housing having a triangular cross section for accommodating the reflection mirror 30, a substantially rectangular plate-shaped lower surface portion 15, and triangular plate-shaped left and right side surfaces erected from both ends of the lower surface portion 15. Is formed across the part 16 and the left and right side surfaces thereof,
A rear surface portion 17 that inclines toward the rear lower side and a front surface portion 18 that is formed in a substantially rectangular planar shape are provided. A rectangular opening 18A is formed in the planar front surface portion 18. A screen 50 that covers the opening 18A is attached to the front surface portion 18.

FIG. 6 is a vertical cross-sectional view of the lower cabinet 13 side of the rear projector 1 and the legs 20 as seen from the front. Referring to FIGS. 3, 4 and 6, the leg portion 20 is a member made of synthetic resin that supports the apparatus body, and is a receiving surface 21 that abuts the entire lower surface portion 134 of the lower cabinet 13.
And a rib-shaped support portion 22 surrounding the back surface of the receiving surface 21 and having a predetermined height dimension. On the receiving surface 21, a recessed groove that is recessed by a dimension corresponding to the height dimension of the support portion 22 is formed at a position from the left side to the center in the center portion in the front-rear direction.

As shown in FIG. 4, when the rear projector 1 is installed on the upper surface of a floor, a desk or the like, the back surface of the supporting portion 22 is in contact with the upper surface of the floor or the like. On the inner side of the support portion 22, there is formed a lattice-shaped reinforcing rib 22A made of synthetic resin and having a predetermined height dimension. This reinforcing rib 22
By A, the rigidity of the leg portion 20 is enhanced and the leg portion 20 is prevented from being displaced from the upper surface such as the floor. However,
The reinforcing rib 22A is not formed on a part of the inside of the support portion 22, and a flat surface portion 22B extending from the left side to the center in the center portion in the front-rear direction is formed on the back surface side of the support portion 22. The flat surface portion 22B is a lower surface portion of the concave groove formed on the receiving surface 21.

As shown in FIG. 6, when the apparatus body is installed on the receiving surface 21 in which the concave groove is formed, it serves as a space extending in the left-right direction from the left side surface portion 132 of the lower cabinet 13 to the central portion. The third duct 93 is configured. However, the lower surface of the apparatus main body is not in contact with both end edges of the third duct 93, and the end edge portion near the left side surface portion 132 and the end edge portion of the substantially central portion are opened. One end of the second duct 92 is connected to the opening near the left side surface portion 132. The other end of the second duct 92 is connected to an intake opening 132L formed in the left side surface portion 132 via an air filter 135 which is a dustproof filter. Also, in the opening in the edge portion of this central portion,
One end of the fourth duct 94 is connected. The other end of the fourth duct 94 is arranged below the optical device that constitutes the main body of the device via an elastic member such as a sponge.

FIG. 7 is a front view of the rear projector 1 with the screen 50 removed. The reflection mirror 30 is a general reflection mirror formed in a substantially trapezoidal shape, and is attached inside the rear surface portion 17 of the upper cabinet 12 such that the long side of the trapezoid is the upper side. Upper cabinet 1
A mirror holder 31 for holding the reflection mirror 30 at a predetermined position is formed inside the rear surface 17 of the second mirror. With this mirror holding portion 31, the long side portion of the reflection mirror 30,
The short side portion and the oblique side portion are supported so that the reflection mirror 30 is not distorted.

[2. Configuration of Internal Unit] FIG. 8 is a perspective view of the internal unit as viewed from the rear. Internal unit 4
Reference numeral 0 is a device that forms a predetermined optical image according to the input image information and also amplifies the audio signal added to this image information and outputs audio and video.
The internal unit 40 includes an internal unit body 400, a support member 200 made of metal such as aluminum for supporting the internal unit body 400 in a predetermined posture, and the first power supply device 3.
01 and the second power supply device 302.

FIG. 9 is a perspective view of a supporting member constituting the internal unit as seen from above. The support member 200 is shown in FIG.
As shown in FIG.
A flat plate-shaped base member 201 arranged to face (FIG. 3)
A plate-like left-right position adjusting member 202 attached to the upper surface of the base member 201, and the left-right position adjusting member 2
The tilt adjusting member 203 is fixed to the upper surface of 02 and tilts downward to the rear side, and the rotational position adjusting member 204 is arranged to face the upper surface of the tilt adjusting member 203.

The base member 201 is a plate member that constitutes the lower surface side of the internal unit 40, and is configured to be able to move forward and backward with respect to the lower surface portion 134 of the lower cabinet 13. By moving the base member 201 back and forth, it is possible to take out the internal unit body 400 from the lower cabinet 13 to the rear side in a sliding manner like pulling out. Here, as shown in FIG. 8, a partition plate 205 that extends vertically and divides the lower cabinet 13 into two left and right spaces is formed at the right side (left side when viewed from the rear) of the base member 201. Has been done.

Returning to FIG. 9, the left / right position adjusting member 202
Has a plurality of loose holes 202A extending in the left-right direction. These loose holes 202A enable the left-right position adjusting member 202 to adjust the position in the left-right direction with respect to the base member 201. Note that the left-right position adjusting member 202 is adjusted in the left-right direction, and then screws are inserted into these loose holes 202A to make the base member 201
It is fixed with screws.

The tilt adjusting member 203 includes a plate-shaped tilt adjusting member main body 206, and leg portions 207 provided at four corners of the tilt adjusting member main body 206 so as to project downward. Each leg 207 is configured to be movable back and forth in the vertical direction. Further, in each leg portion 207, the tip end portion on the side opposite to the tilt adjusting member main body 206 has a left-right position adjusting member 202.
Is attached to. By moving these four legs 207 up and down, the left and right position adjusting member 20 is moved.
The posture of the tilt adjusting member main body 206 with respect to 2 can be adjusted.

The rotation position adjusting member 204 is the projection lens 4
By making the position X of the illumination optical axis of 6 substantially the rotation center, and urging the position away from the rotation center X in the front-back direction or the like, it is rotatable in the in-plane direction along the upper surface of the tilt adjusting member main body 206. It is configured. This rotational position adjusting member 20
An internal unit body 400 (FIG. 8) is attached to the upper surface of 4. From the above, the internal unit body 4
00 is a left-right position adjusting member 202 and an inclination adjusting member 203.
By the rotation position adjusting member 204, the base member 20
With respect to the upper surface of No. 1, the posture can be adjusted including the left-right direction, the tilt direction (tilt direction), and the in-plane rotation direction.

As shown in FIG. 8, the internal unit body 40
Reference numeral 0 includes a light source device 411 (not shown) arranged on the right side (left side when viewed from the rear), and extends from the light source device 411 to the left side and further to the front side in a substantially L-shaped optical unit 401 in plan view, A control board 402 is arranged so as to cover a part of the right side portion of the optical unit 401 and extends from the center to the left side (right side when viewed from the rear).

The control board 402 is a board provided with a control unit including a CPU and the like, and controls the drive of the optical device constituting the optical unit 401 according to the input image information. The periphery of the control board 402 is covered with a metallic shield member 403. This control board 4
The shield member 403 that covers 02 covers the optical unit 401 via a columnar member so that the rotation position adjusting member 2
It is attached to 04. The optical unit 401
The details of will be described later.

The first power supply device 301 is provided on the front side of the light source device 411 and on the left side of the partition plate 205, and has a first power supply block 303 and a lamp drive circuit (adjacent to the first power supply block 303). Ballast) 304. The first power supply block 303 passes through a power cable (not shown) connected to the inlet connector 145,
Electric power supplied from the outside is supplied to the lamp drive circuit 304, the control board 402, and the like. The lamp drive circuit 304 supplies electric power supplied from the first power supply block 303 to the light source lamps that form the optical unit 401.
It is electrically connected to this light source lamp. Such a lamp driving circuit 304 is wired, for example, on a substrate (not shown).

Further, the first power supply device 301 is covered with a metallic shield member 305 whose left and right sides are opened. The shield member 305 has a function of preventing leakage of electromagnetic noise. Furthermore, the first power supply device 3
In the opening on the center side of 01, the axial fan 5 for power supply
21 is attached. Thereby, the cooling air is blown in the extending direction of the first power supply device 301, that is, in the right direction from the central portion. In this case, the shield member 305 functions as a duct that guides the cooling air.

The second power supply device 302 is provided in the space on the right side of the partition plate 205, and the second power supply block 306.
And an audio signal amplification unit (amplifier) 307 that amplifies the input audio signal, and has a metal shield member 3 around the periphery.
It is covered with 08. The second power supply block 306 supplies power supplied from the outside to the audio signal amplification unit 307 through a power supply cable (not shown) connected to the inlet connector 145. The audio signal amplifier 307 is driven by the electric power supplied from the second power supply block 306 and amplifies the input audio signal, and is electrically connected to the speaker box and the woofer box described later, which are not shown in FIG. It is connected to the. Such an audio signal amplifier 307 is wired, for example, on a substrate (not shown).

[3. Configuration of Optical Unit] FIG. 10 is a perspective view showing the optical unit 401. FIG. 11 is a plan view schematically showing the optical unit 401. As shown in FIG. 11, the optical unit 401 optically processes a light beam emitted from a light source lamp that forms a light source device to form an optical image corresponding to image information, and magnifies and projects the optical image. The unit includes an integrator illumination optical system 41, a color separation optical system 42, a relay optical system 43, an optical device 44, a right-angle prism 48, and a projection lens 46 as a projection optical system.

The integrator illumination optical system 41 includes three liquid crystal panels 441 (liquid crystal panels 441R, 441G, 4 for each of red, green and blue color lights, respectively) constituting the optical device 44.
41B) and an optical system for illuminating the image forming area substantially uniformly, and includes a light source device 411, a first lens array 412, a second lens array 413, a polarization conversion element 414, and a superimposing lens 415. Is equipped with.

The light source device 411 is provided with a light source lamp 416 as a radiation light source and a reflector 417, and reflects the radial rays emitted from the light source lamp 416 into the reflector 41.
It is reflected at 7 to be a parallel light beam, and this parallel light beam is emitted to the outside. A halogen lamp is used as the light source lamp 416. In addition to the halogen lamp, a metal halide lamp, a high pressure mercury lamp, or the like can be adopted. A parabolic mirror is used as the reflector 417. In addition,
Instead of a parabolic mirror, a combination of a collimating concave lens and an ellipsoidal mirror may be adopted.

The first lens array 412 has a structure in which small lenses having a substantially rectangular contour when viewed in the optical axis direction are arranged in a matrix. Each small lens splits the light flux emitted from the light source lamp 416 into a plurality of partial light fluxes. The contour shape of each small lens is the liquid crystal panel 44.
It is set so as to be substantially similar to the shape of the first image forming area. For example, if the aspect ratio (ratio of horizontal and vertical dimensions) of the image forming area of the liquid crystal panel 441 is 4: 3, the aspect ratio of each small lens is also set to 4: 3.

The second lens array 413 has substantially the same structure as the first lens array 412, and has a structure in which small lenses are arranged in a matrix. This second lens array 413, together with the superposing lens 415,
The image of each small lens of the lens array 412 is displayed on the liquid crystal panel 44.
1 has an image forming function.

The polarization conversion element 414 is arranged between the second lens array 413 and the superposing lens 415 and is unitized with the second lens array 413. The polarization conversion element 414 as described above converts the light from the second lens array 413 into one type of polarized light, and thus the light utilization efficiency in the optical device 44 is improved.

Specifically, the polarization conversion element 414 outputs 1
Each of the partial lights converted into the polarized light of the type has a superposition lens 41.
Finally, it is almost superimposed on the liquid crystal panel 441 of the optical device 44. In the rear projector 1 using the liquid crystal panel 441 that modulates polarized light, only one kind of polarized light can be used, and therefore, almost half of the light from the light source lamp 416 that emits other kinds of randomly polarized light is not used. Therefore, by using the polarization conversion element 414, all the light fluxes emitted from the light source lamp 416 are converted into one type of polarized light, and the light utilization efficiency in the optical device 44 is improved. Note that such a polarization conversion element 414 is
For example, it is introduced in Japanese Patent Laid-Open No. 8-304739.

The color separation optical system 42 includes two dichroic mirrors 421 and 422 and a reflection mirror 423. The dichroic mirrors 421 and 422 divide a plurality of partial light beams emitted from the integrator illumination optical system 41 into red (R). ), Green (G), and blue (B).

The relay optical system 43 includes an incident side lens 431.
, Relay lens 433, and reflection mirrors 432, 434
And has a function of guiding the red light, which is the color light separated by the color separation optical system 42, to the liquid crystal panel 441R.

At this time, in the dichroic mirror 421 of the color separation optical system 42, the red light component and the green light component of the luminous flux emitted from the integrator illumination optical system 41 are transmitted and the blue light component is reflected. The blue light reflected by the dichroic mirror 421 is reflected by the reflection mirror 42.
The light is reflected at 3, and passes through the field lens 418 to reach the liquid crystal panel 441B for blue. The field lens 418 converts each partial light flux emitted from the second lens array 413 into a light flux parallel to the central axis (chief ray) thereof. The same applies to the field lens 418 provided on the light incident side of the other liquid crystal panels 441G and 441B.

Of the red light and the green light transmitted through the dichroic mirror 421, the green light is reflected by the dichroic mirror 422 and the field lens 41
8 to reach the liquid crystal panel 441G for green.
On the other hand, the red light passes through the dichroic mirror 422, passes through the relay optical system 43, and further passes through the field lens 4
The liquid crystal panel 441R for red light is reached through 18. The relay optical system 43 is used for red light because the optical path length of red light is longer than the optical path lengths of other color lights, so that the reduction of light utilization efficiency due to light divergence or the like is prevented. This is because. That is, the partial light flux that has entered the incident side lens 431 is directly transmitted to the field lens 418. Note that the relay optical system 43 is configured to pass red light of the three color lights, but is not limited to this, and may be configured to pass blue light, for example.

The optical device 44 modulates the incident light flux according to image information to form a color image,
Three incident side polarization plates 442 on which the respective color lights separated by the color separation optical system 42 are incident, and a liquid crystal panel 441R as a light modulation device arranged at the rear stage of each incidence side polarization plate 442,
441G and 441B and liquid crystal panels 441R and 441
G, 441B Ejection-side polarization plate 443 disposed after
And a cross dichroic prism 444 as a color combining optical system.

Liquid crystal panels 441R, 441G, 441B
For example, a polysilicon TFT is used as a switching element. In the optical device 44, the respective color lights separated by the color separation optical system 42 are supplied to the three liquid crystal panels 441R, 441G, 441B and the incident side polarization plate 44.
2 and the exit side polarization plate 443 form an optical image modulated according to image information.

The incident side polarization plate 442 is the color separation optical system 42.
Of the respective color lights separated in step 3, only polarized light in a certain direction is transmitted and other light flux is absorbed, and a polarizing film is attached to a substrate such as sapphire glass. The exit-side polarization plate 443 is also configured in substantially the same manner as the entrance-side polarization plate 442, and has a liquid crystal panel 441 (441R, 441G, 441).
Of the light beams emitted from B), only the polarized light in a predetermined direction is transmitted and the other light beams are absorbed. The incident side polarization plate 442 and the emission side polarization plate 443 are set such that the directions of their polarization axes are orthogonal to each other.

The cross dichroic prism 444 is
The color image is formed by combining the optical images emitted from the emission side polarization plate 443 and modulated for each color light.
The cross dichroic prism 444 is provided with a dielectric multilayer film that reflects red light and a dielectric multilayer film that reflects blue light in a substantially X shape along the interfaces of the four rectangular prisms. Three color lights are combined by the multilayer film.

The liquid crystal panel 441, the exit side polarization plate 443 and the cross dichroic prism 444 described above.
Is configured as an optical device body 45 that is integrally unitized. The incident-side polarization plate 442 is attached by being slidably fitted into a groove portion (not shown) formed in the light guide 47.

Although not specifically shown, the optical device body 45 includes a cross dichroic prism 444, a metal pedestal for supporting the cross dichroic prism 444 from below, and the cross dichroic prism 44.
4 is attached to the light-incident end surface of the light flux No. 4 and has an exit-side polarization plate 443.
And a liquid crystal panel 441 (441R, 441G, 441B) held by four pin members attached to the light flux incident side of the holding plate. A gap with a predetermined interval is provided between the holding plate and the liquid crystal panel 441, and the cooling air flows through this gap.

The right-angle prism 48 is arranged on the light beam exit side of the cross dichroic prism 444 of the optical device 44, and the color image combined by the cross dichroic prism 444 is projected in the direction of the projection lens 46, that is, the color projected in the forward direction. The image is bent upward and reflected.

The projection lens 46 enlarges the color image reflected by the rectangular prism 48 and projects it on the reflection mirror 30. The projection lens 46 is supported by a support member that is screwed and fixed to the rotation position adjusting member 204. Further, as shown in FIG.
A box-shaped cover member 49A having an open upper side is provided around the projection side of. An opening is formed in the upper surface 133 of the lower cabinet 13 to secure the optical path of the projected optical image. The cover member 49A is in contact with the periphery of the opening via an elastic member to close the opening. The lower surface portion 15 of the upper cabinet 12 has the upper surface portion 133 of the lower cabinet 13.
An opening corresponding to the opening is provided.

Each of the optical systems 41 to 44, 48 described above
Is accommodated in a light guide 47 made of synthetic resin as a housing for optical components shown in FIG. The light guide 47 is not shown in FIG.
As shown in FIG.
18, 421-423, 431-434, 442 (Fig. 1
The lower light guide 471 is formed with a groove portion into which 1) is slidably fitted from above, and a lid-shaped upper light guide 472 that closes the upper opening side of the lower light guide 471.

As shown in FIG. 1, the screen 50 is a transmissive screen for projecting the optical image enlarged by the projection lens of the optical unit 401 and reflected by the reflection mirror from the back surface. The screen 50 includes a screen body 51 and a screen cover 5 for housing the screen body 51 with the front side of the screen body 51 exposed.
2 and.

The screen main body 51 has a four-layer structure including a diffusion plate, a Fresnel sheet, a lenticular sheet, and a protective plate in order from the position close to the incident light, that is, from the back surface side.
The light flux emitted from the projection lens and reflected by the reflection mirror is diffused by a diffusion plate, then collimated by a Fresnel sheet, and diffused by optical beads constituting a lenticular sheet to obtain a display image.

Here, as shown in FIG. 2, speaker boxes 70 are attached to the left and right side surfaces 16 of the upper cabinet 12, respectively, and are constructed separately from the upper cabinet 12. The speaker box 70 is a box type that functions as a predetermined speaker. The front surface of the speaker box 70 and the front surface of the screen 50 are substantially flush with each other, and these surfaces are substantially parallel to the vertical direction. As described above, as shown in FIG. 1, the screen cover 52 is fixed to the upper cabinet 12 so as to cover the front surface portion 18 of the upper cabinet 12 and the front surface of the speaker box 70 in a state where the screen body 51 is housed. .

[4. Configuration of Internal Cooling Unit (Cooling Structure)] FIG. 12 is a plan view showing the rear projector 1. Figure 1
3 is a vertical sectional view taken along line XIII-XIII in FIG. Here, in the rear projector 1,
As shown in FIG. 3, an internal cooling unit 500 that cools each of these components 400, 200, 301, 302 that form the internal unit 40 and the inside of the cabinet 10 is provided. The internal cooling unit 500 is provided in the internal unit 40.
The entire inside of the lower cabinet 13 including is cooled.

As shown in FIGS. 12 and 13, the internal cooling section 500 is connected to the lower cabinet 13 from the intake opening 132L.
External cooling air is introduced into the lower cabinet 13
Cool each component 400, 200, 301, 302 in
The air after cooling is discharged to the outside through the exhaust opening 132R on the right side. That is, in the lower cabinet 13, a cooling flow path is formed along the front surface of the screen 50 to flow cooling air from the left side to the right side. The internal cooling unit 500 includes a control substrate cooling flow channel 511, an optical device cooling flow channel 512, a light source cooling flow channel 513, and a power supply cooling flow channel 51.
4 and.

In the internal cooling section 500, as shown in FIG. 12 or 13, a part of the external cooling air introduced by the fans 522 and 523 from the intake opening 132L is an axial fan for the control board. It is sucked by 522, flows through the control board cooling flow path 511, and passes through the control board 40.
Cool 2. The remaining part of the cooling air is sucked by the axial fan 523 and the sirocco fan 524 for the optical device, and flows through the optical device cooling flow path 512 including the second to fourth ducts 92 to 94. , Optical device 4
Cool 4. These cooling air merges in the vicinity above the optical device 44.

Here, in the light source cooling flow path 513, the first duct 91 arranged in the space on the right side of the partition plate 205 and extending in the front-rear direction is used. As shown in FIG. 12, a part of the merged air is sucked by two sirocco fans 525 and 526 for cooling optical components, flows through a light source cooling flow path 513 in the light guide 47, and the polarization conversion element. And cooling the light source device, and then the first duct 9
1, and is discharged to the outside from the exhaust opening 132R.

On the other hand, the remaining part of the merged air is sucked by the axial fan 521 for the power source and flows through the power source cooling flow path 514 to cool the first power source device 301 and the second power source device 302, The gas is discharged from the exhaust opening 132R to the outside. In this way, 2
One flow path is provided. Then, the air after cooling the light source device 411 does not come into contact with other parts,
The second power supply device 3 is directly discharged from the duct 91 to the outside.
It does not interfere with 02.

[5. Control Board Shield Structure] FIG. 14
FIG. 6 is an exploded perspective view showing a holding structure for a control board. The control board 402 processes the image signal and the audio signal to form the image light according to the image information, and the liquid crystal panel 441.
R, 441G, 441B are controlled, and a first control board 402A installed so as to overlap the optical unit 401 in a plane, and a first control board 402A extending in a direction away from the optical unit 401. The second control board 402B is installed, and the integrated control board 402 is the optical unit 40 in a plane.
The first power supply device 301 and the second power supply device 302 are arranged to face each other so as to sandwich 1. Here, the first control board 40
2A and the second control board 402B are in a state of being electrically connected.

The first control board 402A is a portion to which electric power is supplied from the first power supply block 303 of the first power supply device 301, and the upper surface of the first control board 402A is connected to the first power supply block 303. Printed wiring board 4
02C is installed. Therefore, although not specifically shown, a smoothing circuit is formed on the first control board 402A to rectify and smooth the current supplied from the first power supply block 303, and a capacitor, a choke coil, etc. are formed. It is implemented. The printed wiring board 402C has a hole 402C1 for installation formed at one end thereof, and supports the support member 2
At the time of installation to 00, insert a screw into the hole 402C1
The support member 200 is fixed to a column member 204A protruding from the upper surface of the rotational position adjusting member 204. Further, the one end side is connected to the first power supply block 303 by a cable (not shown). The printed wiring board 402C is fixed by fixing the printed wiring board 402C as described above.
C and the supporting member 200 are in an electrically connected state. That is, the base member 201 has the same potential as the ground potential, and the printed wiring board 402C also has the ground potential.

A hole 402A1 is formed through the upper and lower surfaces of the first control substrate 402A at a substantially central portion thereof, that is, a portion corresponding to the optical device 44.
A sirocco fan 524 installed above the optical device 44 is inserted into the 2A1 so that the sirocco fan 524 and the hole 4 are inserted.
The image signal is sent from each of the liquid crystal panels 441 through the gap with the 02A1.
In order to transmit to the R, 441G and 441B, a switching element and a pixel electrode of the drive substrate of each liquid crystal panel 441R, 441G and 441B, and a flexible printed circuit (not shown) electrically connected to the counter substrate are inserted. . Therefore, a connector for connecting the flexible printed board and the control board 402 is arranged near the hole 402A1.

The second control board 402B has an image signal processing circuit as a control unit for processing an image signal and an audio signal formed therein, and has circuit elements such as a CPU and a memory mounted therein for connecting various devices. It is arranged adjacent to the interface board 80 provided with terminals, and is electrically connected to the interface board 80 by a cable or the like not shown.

The control board 402 described above has a metallic shield member 40 so as to cover the outer periphery of the control board 402.
3 are installed. The shield member 403 shields electromagnetic waves radiated from the control board 402, shields electromagnetic waves from the outside, and avoids noise interference. The first control board 402A and the second control board 402B.
A lower shield member 403A disposed on the lower surface of the
Three bodies of an upper shield member 403B arranged on the upper surfaces of the control board 402A and the second control board 402B are integrally configured to cover the outer circumference of the control board 402.

The lower shield member 403A, on which the first control board 402A and the second control board 402B are placed, is formed with a step in a substantially Z-shaped cross section, and the first control board is provided on each end face. 402A and the 2nd control board 402B are mounted. Also, the lower shield member 4
A hole is formed in 03A corresponding to the hole 402A1 formed in the first control substrate 402A. Further, although not shown in the drawing, the lower shield member 403A is provided with three holes corresponding to the corner positions of the first control board 402.
When the control board 402 and the shield member 403 are installed on the support member 200, a screw is inserted into the hole, and the support member 204B protruding from the upper surface of the rotation position adjusting member 204 is formed. Fixed. By the fixing as described above, the support member 200 and the shield member 403 are electrically connected. That is, the potential is the same as that of the base member 201 which is grounded, and the shield member 403 is also grounded.

The upper shield member 403B covers the upper surfaces of the first control board 402A and the second control board 402B, is formed in a substantially mouth shape, and is fixed to the lower shield member 403A by screws or the like. Has been done. In addition, holes 403B1 are formed in a plurality of locations on the upper shield member 403B, and the holes 403B1 allow
The structure is such that heat does not stay inside the shield member 403.

[6. Power Supply Shield Structure] FIG. 15
FIG. 3 is a perspective view showing the structures of a first power supply device 301 and a second power supply device 302. The first power supply device 301 supplies electric power to the light source device 411, the control board 402, and the like, and has a configuration in which the first power supply block 303 and the lamp drive circuit 304 are stacked and arranged in a plane. The first power supply block 303 supplies electric power to the lamp drive circuit 304, the control board 402, and the like, and an alternating current that is input in order to supply a low-voltage large current to the CPU and the like mounted on the control board 402. The power supply board is provided with a transformer (not shown) for converting the DC voltage to a low voltage, a conversion circuit for converting the output from the transformer to a predetermined voltage, and the like.

The first power supply block 303 has openings on its left and right sides so that electromagnetic noise from a mounted circuit member does not leak to the outside, and the surface is subjected to plating treatment, metal vapor deposition treatment, metal foil sticking, or the like. Cylindrical member 303A
The periphery is covered with, and this cylindrical member 303A shields electromagnetic noise to the lamp drive circuit 304 and the control board 402.

The lamp drive circuit 304 is provided with a transformer for converting the electric power from the first power supply block 303 into a predetermined electric power, a power storage capacitor, a resistor, etc. are mounted on the substrate, and the first power supply block 303 is provided. Similarly, the outer periphery is covered with the tubular member 304A. This tubular member 30
4A shields electromagnetic noise from a circuit member mounted on the lamp drive circuit 304, and the first power supply block 303
Also, leakage of electromagnetic noise to the control board 402 is prevented.

The first power supply block 303 and the lamp drive circuit 304 described above are surrounded by a metallic shield member 305 while being electrically connected. The shield member 305 is formed in a substantially mouth-shaped cross-section with the left and right sides opened, and as shown in FIG. 15, the four fixing members 2 projectingly provided on the base member 201.
It is fixed with 01A and screws. In this fixed state, the shield member 305 and the base member 201 are in an electrically connected state. That is, the potential is the same as that of the base member 201 that is at ground potential, and the shield member 305 is also at ground potential.

The second power supply unit 302 amplifies the audio signal input through the interface board 80 and outputs a sound corresponding to the image, and a speaker box and a woofer.
The second power supply block 306 and the audio signal amplifying section 307 are portions for outputting an audio signal to the box, and the metal shield member 308 surrounds the periphery of the base member 201.
It is placed and fixed in parallel on top. Here, the shield member 308 is formed in a substantially mouth shape in cross section, and has holes 308A formed at a plurality of locations on the outer peripheral surface. This hole 3
Due to 08A, the structure is such that heat does not stay in the second power supply device 302. Then, this shield member 308
Is the four fixing members 2 protruding from the base member 201.
It is fixed to 01B with screws. In this fixed state, the shield member 308 and the base member 201 are electrically connected. That is, the potential is the same as that of the base member 201 that is at ground potential, and the shield member 308 is also at ground potential.

[7. Internal Unit Storage Structure] FIG. 16
FIG. 6 is a cross-sectional view showing a state where the internal unit 40 is stored in the lower cabinet 13. As shown in FIG. 16, the internal unit 40 is housed in a state that it can be taken out in a direction away from the lower cabinet 13 with respect to the screen 50.
Casters 201C rotatably formed at the four corners are installed on the lower surface of 1. Although not specifically shown, a rail hole is formed in the lower surface of the lower cabinet 13 in a direction away from the screen 50, and the caster 201C can move on the rail hole. There is. The thickness of the rail hole is substantially the same as or slightly larger than the thickness of the caster 201C. When the internal unit 40 is pulled out, it does not move in a direction orthogonal to the pulling direction. The collision of the constituent members of the internal unit 40 and the side surface of the lower cabinet 13 is avoided.

The internal unit 40 is the lower cabinet 13.
In the state of being housed inside, as shown in FIG.
The base member 201, the lower cabinet 13, and the legs 20 are fixed by screws 201D at the right and left corners of the base member 201 when viewed from the rear side, and the internal unit 40 is securely fixed immovably. Here, when the internal unit 40 is taken out from the lower cabinet 13, the operator needs to use the back cover 1 of the lower cabinet 13.
4 is removed, and further two pillar members 13A that connect the bottom surface of the upper cabinet 12 and the bottom surface of the lower cabinet 13 are removed.

Next, the screw 201D for fixing the base member 201 to the lower cabinet 13 and the leg portion 20 is removed. Then, the operator holds the bent upright piece 201E from the edge of the base member 201 and pulls the upright piece 201E in a direction in which the upright piece 201E is separated from the screen 50.
Is withdrawn. When the internal unit 40 is stored in the lower cabinet 13, the internal unit 40 is removed by reversing the procedure for taking out the internal unit 40.
Is stored in the lower cabinet 13 immovably.

[8. Effects of Embodiment] According to the present embodiment as described above, there are the following effects. (1) The outer circumferences of the first power supply device 301, the second power supply device 302, and the control board 402 are respectively shield members 30.
By being covered by 5,308,403,
Even when the cabinet 10 does not take measures against interference with external devices due to electromagnetic radiation such as Ni or conductive coating, electromagnetic radiation from the first power supply device 301, the second power supply device 302, and the control board 402 is shielded. can do. (2) The shield members 305 and 3 are provided on the first power supply device 301, the second power supply device 302, and the control board 402, respectively.
Since 08 and 403 are installed, mutual interference by the electromagnetic waves between the above members can be prevented.

(3) Since it is not necessary to apply Ni or conductive coating to the cabinet 10 and the cabinet 10 can be made of synthetic resin that transmits electromagnetic waves, the weight of the rear projector 1 is reduced and the recyclability of the cabinet 10 is improved. Can be improved. (4) The base member 201 of the support member 200 is connected to the ground so as to have the ground potential, and the shield members 305, 30
8 and 403 are electrically connected to the base member, so that each shield member 305, 308, and 403 is
Can be connected as a point ground, shield member 30
The potentials of 5, 308, 403 can be made the same as the ground potential of the base member 201, and the individual shield members 30
Mutual interference between the respective members due to fluctuations in the ground potential at 5, 308 and 403 can be suppressed.

(5) On the rear side of the lower cabinet 13, there are pillar members 13A for connecting the bottom surface of the upper cabinet 12 and the bottom surface of the lower cabinet 13 at two positions, that is, the substantially central portion and the right side, as viewed from the rear side. By being installed and being connected to the ground and being electrically connected to the base member 201, the support member 13A suppresses fluctuations in the ground potential of the base member 201 or potential distribution in the base member 201. The base member 20
1, shield members 305, 308 electrically connected to
Since the potential fluctuation and difference of 403 can be suppressed,
Electromagnetic radiation from the first power supply device 301, the second power supply device 302, and the control board 402 can be efficiently shielded.

(6) Base member 20 of internal unit 40
1 has casters 201C on its lower surface and can be slid from the bottom surface of the lower cabinet 13 and taken out to the outside of the lower cabinet 13.
When it is necessary to inspect, evaluate, repair, replace, etc., the members constituting the base member 201, the base member 201 is slid from the lower cabinet 13 to be exposed to the outside of the lower cabinet 13, and the internal unit 40 is inspected. , Evaluation,
It can be repaired and replaced. Therefore,
When inspecting the internal unit 40, the disassembling of the cabinet 10, the removal work of the reflection mirror 30, the screen 50, and the like can be omitted, and the work can be easily performed.
Work efficiency can be improved. (7) First power supply device 301 and second power supply device 302
And the second control board 402B on which the CPU and the like are mounted are spaced apart from each other, and are arranged to face each other with the optical unit 401 interposed therebetween in plan view.
The electromagnetic waves radiated from the power supply device 302 can suppress the influence on the second control board 402B, and can avoid the disturbance and malfunction of the projected image.

(8) First power supply block 303 and first
Since the control board 402A is connected via the printed wiring board 402C, the power supply from the first power supply block 303 suppresses power loss during transmission, and does not consider the cable impedance. By supplying a predetermined power from the block 303, the liquid crystal panels 441R, 441G, 44 on the control board 402
The 1B control can be stably performed. (9) First power supply block 303 and first control board 40
Since 2A is connected via the printed wiring board 402C, the shield effect of the wiring is enhanced, and the first power supply 3
01 or the influence of the electromagnetic radiation from the second power supply device 302 on the wiring can be avoided, and the control in the control board 402 can be stably performed.

[9. Modification of Embodiment] The present invention is not limited to the above-described embodiment, and includes modifications as described below. For example, in the above-described embodiment, the light guide 47 of the optical unit 401 is made of synthetic resin, but it is not limited to this and may be made of metal. With such a configuration, the first power supply device 301 and the second power supply device 302 are connected to the control board 402.
Electromagnetic wave to the first power supply device 30 can be shielded.
The shield structure need not be provided to cover the outer peripheries of the respective members of the first, second power supply device 302 and the control board 402, and the shield structure can be further simplified.
Therefore, the rear projector can be prevented from increasing due to the shield structure, and the rear projector can be downsized.

In the above embodiment, the internal unit 4
When 0 is taken out from the lower cabinet 13, the caster 201C installed on the lower surface of the base member 201 moves on the rail hole formed on the lower surface of the lower cabinet 13, but the structure is not limited to this. The base member 201 of the internal unit 40 is provided on the lower surface of the lower cabinet 13 without providing the rail holes and the casters 201C.
You may adopt the structure which takes out by sliding. That is, any structure may be adopted as long as the internal unit 40 can be slid out from the back side of the lower cabinet 13.

Further, in the above-mentioned embodiment, only the example of the rear projector using the three light modulating devices has been described, but the present invention provides a rear projector using only one light modulating device and two light modulating devices. The present invention can be applied to the used rear projector or the rear projector using four or more light modulators.

In each of the above embodiments, the liquid crystal panel is used as the light modulation device, but a light modulation device other than liquid crystal, such as a device using a micromirror, may be used. In this case, the polarizing plates on the entrance and exit sides can be omitted. Further, in the above-described embodiment, the transmissive light modulator having the different light incident surface and the light exit surface is used. However, the reflective light modulator having the same light incident surface and the light exit surface is used. Good.

[0092]

According to the rear projector of the present invention, while avoiding electromagnetic interference to external equipment, mutual interference due to electromagnetic radiation between members constituting the rear projector housed in the housing is also avoided, and further, There is an effect that the recyclability of the housing can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a rear projector according to the present embodiment as seen from the front.

FIG. 2 is a perspective view of the rear projector according to the exemplary embodiment seen from the rear.

FIG. 3 is an exploded perspective view of the rear projector according to the exemplary embodiment as viewed from the rear, specifically, a view in which the back cover is removed from FIG. 2.

FIG. 4 is an exploded perspective view of the rear projector according to the exemplary embodiment seen from below.

FIG. 5 is a vertical cross-sectional view showing the rear projector according to the embodiment.

FIG. 6 is a vertical cross-sectional view of the lower cabinet and legs according to the embodiment as seen from the front.

FIG. 7 is a front view of the rear projector according to the exemplary embodiment with a screen removed.

FIG. 8 is a perspective view of the internal unit according to the embodiment when viewed from the rear.

FIG. 9 is a perspective view of the support member according to the above embodiment as seen from above.

FIG. 10 is a perspective view showing an optical unit according to the embodiment.

FIG. 11 is a plan view schematically showing the optical unit according to the embodiment.

FIG. 12 is a plan view showing the rear projector according to the embodiment.

13 is a vertical sectional view taken along line XIII-XIII in FIG.

FIG. 14 is an exploded perspective view showing a mounting structure of the control board according to the embodiment.

FIG. 15 is a first power supply device and a second power supply device according to the embodiment.
It is a perspective view which shows the attachment structure of a power supply device.

FIG. 16 is a sectional view showing a storage structure of the internal unit according to the embodiment.

[Explanation of symbols]

1 Rear Projector 10 Cabinet (Housing) 13A Column Member 40 Internal Unit (Image Forming Unit) 46 Projection Lens (Projection Optical System) 200 Support Member (Base) 201C Casters (Slide Mechanism) 303 First Power Block (Power Supply) 304 Lamp drive circuit (drive circuit) 306 Second power supply block (power supply) 305, 308, 403 Shield member 402 Control board 402C Printed wiring board 411 Light source device (light source) 441, 441R, 441G, 441B Liquid crystal panel (electro-optical device)

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04N 5/64 501 H04N 5/64 501D (72) Inventor Shigeyuki Seki 3-3-5 Yamato, Suwa City, Nagano Seiko Epson In-house F-term (reference) 2H088 EA12 EA19 HA06 MA20 2H089 HA14 HA17 HA40 JA08 JA10 JA11 QA09 QA10 UA05 2K103 AA01 AA05 AA11 AA17 AB10 CA06 CA08 CA60 CA64 5C058 AA06 AB06 BA35 EA01 EA26

Claims (5)

[Claims] 1. An electro-optical device that modulates a light beam emitted from a light source to form an optical image according to image information, and an image forming unit including a projection optical system that magnifies and projects the optical image, and an image forming unit. A rear projector including a box-shaped housing for housing a unit, and a screen that is provided to be exposed on any side surface of the box-shaped housing and projects the optical image formed by the image forming unit. The image forming unit includes a drive circuit that drives the light source, a control board that controls the electro-optical device, and a power supply that supplies electric power to the drive circuit and the control board. It has a base made of an electrically conductive material to support, a metal shield member covering the outer periphery of the drive circuit, the control board, and the power supply, the base is set to ground potential, the shield member On this base A rear projector that is connected. 2. The rear projector according to claim 1, wherein the housing is provided with a supporting member that is provided inside the housing and bears a part of a supporting load, and the supporting member includes the base and the supporting base. A rear projector, which is abutted and electrically connected. 3. The rear projector according to claim 1 or 2, wherein the base is slid from a housing on the side opposite to the support surface of the image forming portion of the base to form the image. A rear projector, which is provided with a slide mechanism that exposes a part to the outside of the housing. 4. The rear projector according to claim 1, wherein the image forming unit has an optical system including the light source and the electro-optical device, the control board, and the drive unit. A rear projector characterized in that the circuit and the power supply are arranged to face each other with this optical system interposed therebetween. 5. The rear projector according to claim 1, wherein the power supply and the control board are electrically connected via a printed wiring board. .