JP2007171393A - Projection display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection display apparatus capable of causing a reinforcing plate not only to reinforce a substrate but also to dissipate the heat of the substrate to the reinforcing plate. <P>SOLUTION: The projection display apparatus is equipped with an image forming apparatus 40 which has a substrate 40, a reinforcing plate 52 for reinforcing the substrate 40, and a heat dissipation section disposed on the reinforcing plate 52 to transmit the heat emitted by the substrate 40 via the reinforcing plate 52 to dissipate the heat, a projection optical system 36 which projects the image formed by the image forming apparatus 34, and a casing which is disposed with the image forming apparatus 34 and the projection optical system 36. The reinforcing plate 52 is electrically connected to the substrate 40; the casing is equipped with a base part 14a connected to the ground; and a relay 82 for electrically connecting both is disposed between the reinforcing plate 52 and the base part 14a of the casing 12. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a projection display device that projects an image generated by an image generation device including a spatial light modulator.

  Projection display devices using digital micromirror devices (DMD) as spatial modulation elements have already been put into practical use. For example, Patent Document 1 discloses a digital micromirror device. This mirror device is also known as a deformable mirror device. For this reason, a projection display apparatus using DMD spatially modulates light obtained by giving a predetermined color to light from a light source using R, G, and B filters, and an image obtained by spatial modulation. A display image is obtained by projecting light.

For the DMD substrate, it is recommended to use a reinforcing plate to operate the DMD. Thereby, the DMD substrate can be supported in a reinforced state, and the operation of the DMD can be stabilized.
Japanese Patent No. 3492400

  It is recommended that the DMD substrate disclosed in Patent Document 1 described above uses a reinforcing plate in order to stabilize the operation of the DMD. However, this reinforcing plate is provided only for reinforcement. However, when the DMD substrate is used for, for example, a projection display device or the like, grounding is provided for use in combination with other members in addition to the DMD substrate. It is desirable that heat can be dissipated.

  The present invention has been made to solve such problems, and the object of the present invention is not only to reinforce the substrate, but also to dissipate the heat of the substrate to the reinforcing plate. Another object is to provide a projection display device capable of connecting a substrate to ground.

In order to solve the above-described problems, a projection display device according to the present invention includes a circuit board, a reinforcing plate that reinforces the circuit board, and the reinforcing plate that is disposed on the reinforcing plate and generates heat generated in the circuit board. An image generation device having a heat radiating portion for transferring heat through the heat sink and dissipating the heat at the base end portion, and an image formed by the image generation device are projected at the distal end portion of the image generation device A projection optical system; and a housing in which the image generation apparatus and the projection optical system are disposed. The reinforcing plate is electrically connected to the circuit board, and the housing is connected to a ground. And a relay that electrically connects the reinforcing plate and the base of the housing is disposed between the reinforcing plate and the base of the housing.
By arranging a relay on the reinforcing plate, it is possible not only to reinforce the board but also to dissipate the heat of the board to the reinforcing plate and to connect the board to the ground. Can provide a simple projection display device.

  According to the present invention, the projection display device can cause the reinforcing plate not only to reinforce the substrate but also to dissipate the heat of the substrate to the reinforcing plate and to connect the substrate to the ground. Can be provided.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings. Here, an embodiment of a video projector device (projection display device) will be described with reference to FIGS.
A video projector apparatus 10 shown in FIG. 1 is arranged in a substantially rectangular parallelepiped housing 12 in a state in which various devices are unitized and blocked.
As shown in FIG. 1, the housing 12 includes a bottom cover 14 and a top cover 16. The bottom cover 14 includes a base portion 14a formed in a substantially rectangular shape, and a standing portion 14b that is erected from an edge portion of the base portion 14a and to which the top cover 16 is detachably mounted by engagement or the like. Yes.

  As shown in FIG. 2, the base 14a of the bottom cover 14 is provided with a device (optical system) necessary for projecting an image on a screen (not shown) or the like at a predetermined position. A power supply block 22 is disposed on the front side of the bottom cover 14 in FIG. A light source unit 24 capable of outputting white light is disposed substantially at the center of the bottom cover 14. A color filter 26 is disposed adjacent to the light source unit 24. An optical engine block (image projection unit) 28 is disposed adjacent to the color filter 26.

  That is, the optical engine block 28 that generates image information to be output and projects the image information at a predetermined magnification toward the outside of the housing 12 at a predetermined position of the base portion 14a of the bottom cover 14 is fitted or screwed. It is arranged. The optical engine block 28 includes an incident optical system 32, an image generation device 34, and a projection optical system 36. The incident optical system 32 guides the light from the light source unit 24 to the image generation device 34. The image generation device 34 generates image light to be projected based on the image signal. The image generation device 34 spatially modulates the light supplied from the light source unit 24 through the incident optical system 32 with a video signal supplied from the outside, and outputs the light to the projection optical system 36. The image generation apparatus 34 uses a digital micromirror device (hereinafter referred to as DMD) 38. The DMD 38 is disposed on a DMD substrate (circuit board) 40. That is, the image generating apparatus 34 includes a DMD substrate 40 at the base end portion of the housing portion 34a, and a DMD 38 is disposed on the DMD substrate 40.

  As shown in FIG. 3, between the light source unit 24 and the DMD 38, a predetermined color component of white light is blocked in correspondence with the R, G, B video signals in a predetermined order. The color filter 26 described above is provided. White light from the light source unit 24 is applied to an arbitrary color filter (R, G, B) of the color filter 26, and is applied to the optical engine block 28 through the color filter 26. Light (R, G, B color component light) that has passed through the color filters 26 of the color filter 26 and passed through the light pipe 32a of the incident optical system 32 to have a uniform wavefront intensity is transmitted through the lens 32b. The light is condensed on an image forming surface of DMD 38 not described in detail. The color filter 26 is rotated at a predetermined rotational speed by a motor (not shown).

  The image forming surface includes an arbitrary number of micromirrors arranged in a matrix. The inclination of each micromirror is controlled based on an image signal (video signal) supplied through the signal processing unit 42. In other words, the light given a predetermined color by the color filter 26 is reflected in a predetermined direction according to the angle of each mirror whose angle is controlled according to the image signal. Therefore, the light reflected in accordance with the position information of the matrix-like image forming surface is output to the projection optical system 36 as a projection image (output video).

  The projection optical system 36 enlarges the image light generated by the image generation device 34, outputs the image light to the outside of the housing 12, and projects it onto a screen (not shown). Accordingly, the light emitted from the light source unit 24 forms image information by the image generation device 34 through the color filter 26, and an image is output from the projection optical system 36 to the outside. Although not described in detail, in addition to such an optical system, members, units, and the like that perform a screen function, a control function, an acoustic function, a cooling function, and the like are incorporated in the base portion 14a of the bottom cover 14.

  As shown in FIG. 4, a DMD substrate 40 on which a DMD 38 (see FIG. 3) is disposed is disposed at the base end portion of the housing portion 34 a of the image generation apparatus 34. The DMD substrate 40 is provided with a reinforcing plate 52 for supplementing the strength of the substrate 40. Further, a heat radiating portion 54 is disposed on the reinforcing plate 52 on the side opposite to the side on which the DMD substrate 40 is disposed. The heat radiating portion 54 includes a flat plate 56 that is brought into contact with the reinforcing plate 52, and heat radiating fins 58 that are integrally formed with the flat plate 56. The heat radiation fin 58 extends from the flat plate 56 in a predetermined direction. For this reason, when heat is transmitted to these fins 58, efficient heat dissipation is performed. The reinforcing plate 52 and the heat radiating portion 54 are made of a material having conductivity and thermal conductivity, such as aluminum.

  As shown in FIG. 5, through holes 60, 62, and 64 are formed in the DMD substrate 40, the reinforcing plate 52, and the heat dissipation portion 54, respectively. Further, a hole portion 66 to be screwed is formed in the housing portion 34 a of the image generating device 34. Here, the diameter of the through hole 64 provided in the flat plate 56 of the heat radiating portion 54 is formed to be larger than the diameter of the through holes 60 and 62 provided in the DMD substrate 40 and the reinforcing plate 52. The diameter of the through hole 64 is slightly larger than the diameter of a large diameter portion 74 of the support pin 70 described later. In addition, the diameter of the hole 66 of the housing part 34 a is substantially the same as the diameter of the through hole 62 formed in the DMD substrate 40 and the reinforcing plate 52. The diameters of the through holes 60 and 62 are slightly larger than the diameter of the small diameter portion 72 of the support pin 70.

  In these through holes 60, 62, 64 and hole 66, a support pin 70 having a male screw portion 72 a at the tip is disposed. The support pin 70 has a small diameter portion 72 disposed in the hole portion 66 of the housing portion 34 a, the through hole 60 of the DMD substrate 40, and the through hole 62 of the reinforcing plate 52, and a base end portion of the small diameter portion 72. A large diameter portion 74 provided in the through hole 64 of the heat radiating portion 54 and a dish portion 74 a provided at the base end portion of the large diameter portion 74 are provided. A stepped portion 76 between the small diameter portion 72 and the large diameter portion 74 is disposed in a later-described concave portion 52 b of the reinforcing plate 52. A spring 78 is disposed between the plate portion 74 a and the heat radiating portion 54. For this reason, the heat radiating portion 54, the reinforcing plate 52, and the DMD substrate 40 are urged by the spring 78 against the housing portion 34a.

  The reinforcing plate 52 has a convex part 52a in which a part of the surface close to the DMD substrate 40 is formed in a convex shape with respect to the other part, and a part of the surface close to the heat radiating part 54 with respect to the other part. And a concave portion 52b formed in a concave shape. The convex portion 52 a and the concave portion 52 b are formed concentrically with respect to the center of the through hole 62. For example, the convex portions 52a and the concave portions 52b are formed at a time around the through hole 62 by press molding or the like.

  The convex portion 52a is formed in order to keep good contact with the DMD substrate 40. The protrusion 52a is reliably electrically connected to the DMD substrate 40. Further, since the reinforcing plate 52 is brought into contact with the DMD substrate 40 by the convex portions 52a, the heat generated by the DMD substrate 40 can be reliably transferred toward the reinforcing plate 52. Then, heat can be further transferred from the reinforcing plate 52 to the heat radiating portion 54.

  On the other hand, the recess 52 b is provided to press the stepped portion 76 of the support pin 70 against the reinforcing plate 52.

  As shown in FIG. 4, an extending portion 53 that is bent from the flat plate 56 toward the extending direction of the heat dissipating fins 58 is formed at the lowermost portion of the reinforcing plate 52. For this reason, the area | region which contacts external air for heat dissipation can be enlarged compared with the case where it is flat.

  A relay (shield gasket) 82 is attached to the lowermost part of the reinforcing plate 52. The relay 82 has an outer periphery formed of a cloth-like conductive member, for example, and an inner portion formed of a member that can be easily elastically deformed by a weak force such as a sponge. The outer periphery of the relay 82 is electrically connected to the reinforcing plate 52. That is, the relay 82 is electrically connected to the reinforcing plate 52.

  The optical engine block 28 formed in this way is arranged at a predetermined position of the base portion 14a of the bottom cover 14. The upper surface of the base 14a of the bottom cover 14 is conductively painted. As shown in FIG. 6, a substantially rectangular region 90 is formed on the upper surface of the base portion 14a. This region 90 is formed to be slightly larger than the relay 82, and the relay 82 is disposed inside.

  In this region 90, for example, three projecting portions 92 are formed which are substantially triangular and are erected upward from the upper surface of the base portion 14a. One side of the protrusion 92 is formed to receive the relay 82 in a state where the optical engine block 28 is mounted on the base 14a. For this reason, the relay 82 is contacted so as to generate a drag in a direction orthogonal to one side of the protrusion 92. The protrusion 92 is conductively coated in the same manner as the base portion 14a, and is electrically connected to the conductive coating of the base portion 14a.

Next, the operation of the projector device 10 according to this embodiment will be described.
The support pin 70 screwed into the housing part 34 a through the through hole 64 of the heat radiating part 54, the through hole 62 of the reinforcing plate 52, and the through hole 60 of the DMD substrate 40 has a space between the dish part 74 a and the heat radiating part 54. A spring 78 is disposed on the surface. Therefore, the heat radiating portion 54 is urged to the reinforcing plate 52, the reinforced plate 52 is urged to the DMD substrate 40, and the DMD substrate 40 is further urged to the housing portion 34a. For this reason, in particular, the force applied to the DMD substrate 40 can be maintained in an appropriate state. At this time, since the reinforcing plate 52 and the DMD substrate 40 are in close contact with each other with an appropriate force, the reinforcing plate 52 can reinforce the DMD substrate 40.

  Such an optical engine block 28 is installed at a predetermined position of the base portion 14 a of the bottom cover 14. In this case, the relay 82 is disposed in a predetermined region 90 of the base portion 14a. The relay 82 contacts the protruding portion 92 in a deformed state. For this reason, the relay 82 is electrically connected to the conductive coating on the upper surface of the base portion 14a that is grounded. The relay 82 is electrically connected to the reinforcing plate 52, the DMD substrate 40, and the DMD 38. For this reason, the DMD substrate 40 and the DMD 38 are grounded.

  When the projector device 10 is operated, white light emitted from the light source unit 24 is condensed and incident on the image forming surface of the DMD 38 through the color filter 26, the light pipe 26a, the lens 26b, and the like. The DMD 38 reflects the light given a predetermined color by the color filter 26 in a predetermined direction according to the angle of each mirror whose angle is controlled according to the video signal. For this reason, the DMD 38 generates heat when the projector device 10 is used.

  At this time, the convex portion 52 a of the reinforcing plate 52 is in contact with the DMD 38. Since the reinforcing plate 52 has thermal conductivity, the heat generated by the DMD 38 is transferred to the reinforcing plate 52. This heat is transferred over the entire reinforcing plate 52, and part of the heat is transferred to the heat radiating portion 54. At the lowermost part of the reinforcing plate 52, the extending portion 53 extending in the same direction as the extending direction of the heat dissipating fins 58 of the heat dissipating portion 54 is provided. Is formed. For this reason, heat is efficiently radiated from the reinforcing plate 52. Moreover, since the heat radiating part 54 is integrally provided with the flat plate 56 and the heat radiating fins 58, a large area in contact with the atmosphere is taken. Therefore, heat is efficiently radiated from the heat radiating portion 54.

  Therefore, the reinforcing plate 52 of the projector device 10 according to the present embodiment can be used to reinforce the DMD substrate 40 and to dissipate heat generated by the DMD 38, and to ground the DMD 38. Can also be used.

As described above, according to this embodiment, the following effects can be obtained.
The reinforcing plate 52 can be used not only for reinforcing the DMD substrate 40 but also for heat dissipation, and can also be used as one of connection members for grounding the DMD substrate 40. At this time, the DMD substrate 40 is grounded, that is, the reinforcing plate 52 and the relay 82 provided on the reinforcing plate 52 are disposed between the DMD substrate 40 and the conductively coated base portion 14a. . With such a simple configuration, the DMD substrate 40 can be grounded, that is, the DMD 38 can be securely grounded.

  In addition, a portion (extended portion 53) that is bent into an L shape exists at the lower portion of the reinforcing plate 52. By this part, the area for heat dissipation can be increased as much as possible.

  Further, since the relay 82 is soft and easily deformable, and the region 90 where the relay 82 is disposed is provided in the base portion 14a, and the projection 92 is provided in the region 90, the relay 82 and the base portion 14a are provided. The electrical connection between them can always be kept good.

  The embodiment has been specifically described so far with reference to the drawings. However, the present invention is not limited to the above-described embodiment, and all the embodiments performed without departing from the scope of the invention are described. Including.

1 is a schematic perspective view showing a video projector apparatus according to an embodiment of the present invention. 1 is a schematic perspective view showing a state in which a device for projecting an image is arranged on a bottom cover of a video projector device according to an embodiment. FIG. 1 is a schematic perspective view showing a light source unit, a color filter, and an optical engine block of a video projector device according to an embodiment. 1 is a schematic partial cross-sectional view showing an image generation device and a projection optical system of an optical engine of a video projector device according to an embodiment. FIG. 5 is a schematic enlarged view of a position indicated by a reference symbol IV in FIG. 4, showing a part of the image generation device of the optical engine of the video projector device according to the embodiment. The schematic perspective view which shows the area | region where the relay of an optical engine block is arrange | positioned among the base parts of the bottom cover of the video projector apparatus which concerns on one embodiment.

Explanation of symbols

  34 ... Image generation device, 34a ... Housing part, 36 ... Projection optical system, 38 ... Digital micromirror device (DMD), 40 ... DMD substrate, 42 ... Signal processing part, 52 ... Reinforcement plate, 52b ... Recess, 52a ... Convex Part, 53 ... extension part, 54 ... heat radiation part, 56 ... flat plate, 58 ... fin for heat radiation, 60, 62, 64 ... through hole, 66 ... hole part, 70 ... support pin, 72 ... small diameter part, 72a ... male Screw part, 74 ... large diameter part, 74a ... dish part, 76 ... step part, 78 ... spring, 82 ... relay

Claims (6)

A base board including a circuit board, a reinforcing plate that reinforces the circuit board, and a heat dissipating portion that is disposed on the reinforcing plate and transfers heat generated in the circuit board through the reinforcing plate to dissipate the heat. An image generating apparatus in the unit;
A projection optical system that is disposed at a tip of the image generation device and projects an image formed by the image generation device;
A housing in which the image generation device and the projection optical system are disposed,
The reinforcing plate is electrically connected to the circuit board;
The housing includes a base connected to ground,
A projection display device, wherein a relay for electrically connecting both of the reinforcing plate and the base of the casing is disposed.   2. The projection according to claim 1, wherein the relay includes a flexible member that has a conductive member at least on an outer peripheral surface thereof and contacts the base portion in a deformed state due to a weight of the image generation apparatus. Type display device.   The projection display device according to claim 1, wherein a protrusion for contacting the relay is formed on the base of the casing.   The reinforcing plate and the circuit board are disposed around the pin and a pin penetrating the reinforcing plate and the circuit board, and are attached to the base end of the image generating apparatus by a spring that biases the reinforcing plate against the circuit board. 4. The projection display device according to claim 1, wherein the projection display device is biased.   The projection display device according to claim 4, wherein the reinforcing plate includes a convex portion that is locally brought into contact with the circuit board.   The projection display device according to claim 1, wherein the reinforcing plate is bent at an end portion thereof.

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