JP2001228539A - Projection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the positioning, attaching and detaching of a reflection prism at the inside of a frame body by preventing the rupture and deformation of the reflection prism by temperature rising in a projection type display device using the reflection prism. SOLUTION: The reflection prism 1 is positioned and fixed at an attaching member 2. The attaching member 2 is positioned at the frame body 4 by using a pin and a pin hole and is fixed by a screw. A member whose heat conductivity is excellent is used as the attaching member 2, so that heat radiation is performed by using it. The upper surface 1e and the side surface 1b of the prism 1 are pressed and fixed by a pressing member 17. The pressing member 17 is fixed at the attaching member by the screw. Heat radiation fins 9a and 10a are provided in the attaching member 2 or the prism 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a projection type display device, and more particularly to cooling of a reflection prism and positioning in a device.

[0002]

2. Description of the Related Art As a projection display device, a DMD (Digita
l DLP (Digital) using Micromirror Device
Light processing) is known. FIG. 8 shows a schematic diagram thereof. The white light emitted from the light source 24 is rotationally driven by a motor by a condenser lens 25.
The light enters a filter wheel 26 having red, green, and blue color filters. This filter wheel 26
It rotates in synchronization with the operation of the DMD 27.
Green and blue light components are selected and passed in a repetitive order. The light that has passed through the filter wheel 26 is received by the condenser lens 28, and is selectively reflected by the DMD 27 in accordance with an image signal supplied from a unit (not shown). An image is obtained by projecting the reflected light on the screen 29 via the lens 35. Among these, the condensing lens 25, the filter wheel 26, the DMD 27, and the lens 35 form an image forming unit that receives light from the light source, forms an optical image corresponding to an image signal, and enlarges and projects the image on the screen 29. ing.

In such a projection display device, it is a major problem to increase the brightness of an image projected on a screen. One method for that is a method using a plurality of light sources as shown in FIG. In the figure, light sources 30, 3
The two lights exiting from 1 are condensed and reflected on the reflecting surface of the reflecting prism 34 by the condenser lenses 32 and 33, overlap with each other, and enter the filter wheel 26 by the condenser lens 25. The light that has passed through the filter wheel 26 is received by the condenser lens 28, and is selectively reflected by the DMD 27 in accordance with an image signal input from a unit (not shown). An image is obtained by projecting the reflected light on the screen 29 via the lens 35. Among them, the condenser lens 25, the filter wheel 26, the DM
The D27 and the lens 35 form an image forming unit that receives light from the light source, forms an optical image corresponding to an image signal, and enlarges and projects the image on the screen 29.

[0004] When two lights from the two light sources 30 and 31 overlap each other, high-luminance light is obtained, and as a result, the luminance of an image projected on the screen 29 can be increased. In such a configuration, the reflection prism 34, the lens 25, the filter wheel 2
6, the lens 28, the DMD 27, and the lens 35 are mounted on the common frame 4, and the combination of the light source 30 and the lens 32 and the combination of the light source 31 and the lens 33 are mounted on different frames (not shown) and positioned. It is generally done.

[0005]

According to the above prior art, of the light condensed on the reflecting surface of the reflecting prism, some of the light passes through the reflecting prism in addition to reflected light, and some of the light is reflected. Is absorbed by the reflecting prism and turned into heat.
Although the amount of light converted into heat is small as a whole, since the condensed light is applied to the prism, the temperature of the prism becomes locally high, temperature unevenness occurs, and thermal stress occurs. In a portion where the thermal stress is large, the reflection prism may be broken.
Even if it does not break, the dimensional accuracy such as the accuracy of the inclination angle of the reflecting surface of the prism surface decreases due to the thermal deformation of the prism,
There is a problem in that the light reflection efficiency is reduced, and the luminance of an image projected on the screen is reduced.

In order to maximize the reflection efficiency of the prism and obtain a large luminance, not only the dimensional accuracy of the above-described prism but also the optical position accuracy of the prism with respect to the light source and the lens in the optical device is important. It is. However, it is difficult to position accurately with the conventional device,
There is also a problem that the positioning mechanism is complicated.

Further, the reflecting prism is usually made of glass and coated to protect the reflecting surface. However, for fixing the reflecting prism in an optical device, an adhesive or an adhesive tape is used so as not to damage the prism. It is common to use Therefore, there is a problem that once the prism is fixed, it cannot be easily removed.

An object of the present invention is to solve the above-mentioned problems, and one object of the present invention is to provide a projection type display device in which destruction or deformation of a reflecting prism due to a rise in temperature does not easily occur.

Another object of the present invention is to provide a projection display device in which the positioning of the reflection prism is easy.

Still another object of the present invention is to provide a projection display device in which a reflecting prism can be easily mounted.

Still another object of the present invention is to provide a projection type display device capable of removing a reflection prism.

[0012]

According to a first aspect of the present invention, there is provided a projection display apparatus comprising: a plurality of illumination light sources; a reflecting prism for combining light emitted from the plurality of illumination light sources; An image forming unit that receives the combined light, forms an optical image corresponding to an image signal, and enlarges and projects the image on a screen; and an image forming unit that is formed of a thermally conductive material, contacts the reflective prism, and cools the reflective prism. And a heat conductive member.

According to a second aspect of the present invention, in the projection type display device according to the first aspect, the heat conductive member includes a radiation fin.

According to a third aspect of the present invention, there is provided a projection display apparatus, comprising: a plurality of illumination light sources; a reflection prism for synthesizing light emitted from the plurality of illumination light sources; Forming an optical image corresponding to an image signal and enlarging and projecting the image on a screen, a frame holding the image forming unit, a mounting member holding the reflective prism, and the mounting member. Positioning means for positioning with respect to the frame.

According to a fourth aspect of the present invention, there is provided the projection type display device according to the third aspect, further comprising fixing means for detachably attaching and fixing the attaching member to the frame. And

According to a fifth aspect of the present invention, in the projection type display device according to the third aspect, the positioning means comprises: a pin erected on one of the frame and the mounting member; Provided on the other of the mounting member,
And a pin hole fitted to the pin.

According to a sixth aspect of the present invention, in the projection type display device according to the third aspect, the reflecting prism has first, second and third side surfaces and first and second bottom surfaces. A triangular prism, wherein the first and second side surfaces constitute a reflection surface that receives and reflects light from a light source, and wherein the mounting member is configured to contact a first bottom surface of the reflection prism. A support surface, a second support surface in contact with a third side surface of the reflection prism, and protruding from the first support surface;
A projection engaging with the first side surface of the reflection prism.

According to a seventh aspect of the present invention, in the projection type display device according to the sixth aspect, the projection type display device further comprises the first type.
And a second projection protruding from the supporting surface of the first prism and engaging with a second side surface of the reflection prism.

According to an eighth aspect of the present invention, in the projection type display apparatus according to the sixth aspect, the presser further includes a portion which is detachably fixed to the mounting member and presses the second bottom surface of the reflection prism. It is characterized by having a member.

According to a ninth aspect of the present invention, in the projection type display device according to the eighth aspect, the pressing member comprises:
It is also characterized by having a portion for pressing the second side surface of the reflection prism.

According to a tenth aspect of the present invention, in the projection display device according to any one of the third to ninth aspects, the mounting member is formed of a heat conductive material and is in contact with the reflecting prism. , For cooling the reflection prism.

According to a eleventh aspect of the present invention, in the projection type display device according to the tenth aspect, the mounting member includes a heat radiation fin.

According to a twelfth aspect of the present invention, there is provided a projection display apparatus, comprising: a plurality of illumination light sources; a reflecting prism for synthesizing light emitted from the plurality of illumination light sources; Forming an optical image corresponding to the image signal and projecting the image on a screen in an enlarged manner, a frame holding the image forming unit, and means for fixing the reflecting prism to the frame pair. Wherein the prism is provided with a radiation fin.

According to a thirteenth aspect of the present invention, there is provided a projection display apparatus according to any one of the first to twelfth aspects, wherein
A cooling fan for guiding cooling air to the reflection prism is provided.

[0025]

Embodiments of the present invention will be described below. In any of the following embodiments, the overall configuration of the projection display device is the same as that shown in FIG. The difference is the reflective prism and the components for cooling and mounting the same. Embodiment 1 FIG. FIG. 1 shows a reflection prism and a mounting member of a projection display device according to a first embodiment of the present invention.
FIG. 1A is a perspective view, and FIG. 1B is Ib-I in FIG.
It is a sectional view taken on line b. In FIG. 1, the reflecting prism 1 is
It is made of glass and has a triangular prism shape, and has first, second and third side surfaces 1a, 1b and 1c, a first bottom surface 1d and a second bottom surface.
Bottom surface 1e. First and second sides 1a and 1b
Constitutes a reflective surface. These sides 1a and 1b
They have the same shape as each other, form an angle of 90 degrees with each other, and form a ridge line 1f. Light from the light sources 30 and 31 of FIG. Light from the light sources 30 and 31 is condensed by lenses 32 and 33, respectively, and a ridge line 1f on the side surfaces 1a and 1b, respectively.
(Only the area on the side surface 1b is indicated by the symbol S).

The mounting member 2 has an L-shape when viewed from the side, and is a flat plate-like horizontal seat plate portion 2a and extends vertically upward from the rear end of the seat plate portion 2a in the drawing. And a flat back plate 2b. A first bottom surface (lower bottom surface in FIG. 1) 1d of the prism 1 is in contact with an upper surface (first support surface) 2c of the seat plate portion 2a and is adhered to the upper surface 2c with an adhesive (not shown). . The third side surface 1c of the prism 1 is connected to the front surface (second support surface) of the back plate 2b via the heat transfer sheet 8.
It is in contact with 2d. Further, a pair of projections 3a, 3b projecting upward from the upper surface 2c is provided.
The lower ends of the second side surfaces 1a and 1b are engaged with these. In the illustrated example, the first and second side surfaces 1a and 1
b, the portion near the ridge line with the third surface 1c is the protrusion 3a
The positions of the projections 3a and 3b are determined so as to engage with the projections 3a and 3b. A seat plate portion 2a constituting the mounting member 2,
The back plate portion 2b and the protrusions 3a and 3b are integrally formed of, for example, a material having good heat conductivity, such as aluminum, by casting. As the heat transfer sheet 8, a heat conductive member having excellent thermal conductivity and flexibility, for example, a material made of graphite as a raw material can be used.

The seat plate portion 2a is provided with a pair of pin holes 6a and 6b extending vertically in the figure, and a pair of screw through holes (fool holes) 7a also extending vertically in the figure.
And 7b are provided. Screw through holes 7a and 7b
Is provided on a portion of the upper surface 2c of the seat plate portion 2a where the prism 1 is not mounted. The screw through holes 7a and 7b are for inserting a screw from above in the figure, and in the illustrated example, counterbore portions 7c and 7d are formed, and when the screw 12 is inserted from above in the figure, the screw is formed. The head 14 does not protrude from the upper surface 2c of the seat plate 2a. The upper surface 2c of the seat plate portion 2a has a substantially rectangular shape when viewed from above in the figure, a rear edge 2f is substantially aligned with the third side surface 1c of the prism 1, and a front edge 2e thereof is substantially aligned with the ridge line 1f of the prism. Are aligned. The screw through holes 7a and 7b
It is formed near the front edge 2e of the seat plate 2a.

The frame 4 has a pair of pins 5 erected at predetermined positions, which are tightly fitted in the pin holes 6a and 6b. 4 is positioned. The frame 4 also has a pair of screw holes (female screws) 13 formed at predetermined positions.
A screw 12 penetrating through a and 7b is screwed into a screw hole 13.

In assembling, first, the third side surface 1c of the prism 1 is attached to the front surface 2d of the back plate 2b of the mounting member 2.
Contact. At this time, the heat transfer sheet 8 is interposed between them. In this state, the lower end of the prism 1 is made to have the protrusions 3a and 3b while the third side surface 1c is along the front surface 2d.
The prism 1 is lowered so that the first and second side surfaces 1a and 1b engage with the protrusions 3a and 3b, and the first bottom surface 1d of the prism is moved to the upper surface 2c of the seat plate portion 2a.
Contact. At this time, an adhesive (not shown) is interposed between the bottom surface 1d and the top surface 2c to fix the bottom surface 1d and the top surface 2c. Next, the pin holes 6a and 6b of the mounting member 2
Then, the pins 5 of the frame 4 are inserted. Next, the screw 12 is passed through the screw through holes 7a and 7b of the mounting member 2, and the frame 4
And fixed by screwing it into the screw hole 13.

As described above, the third side surface 1 of the prism 1
c is in contact with the front surface 2d of the back plate 2b of the mounting member 2, the first and second side surfaces 1a and 1b are engaged with the protrusions 3a and 3b, and the first bottom surface 1d is connected to the upper surface 2c of the seat plate 2a. , The prism 1 is positioned with respect to the mounting member 2, and the pins 5 of the frame 4 are inserted into the pin holes 6 a and 6 b of the mounting member 2, whereby the mounting member is mounted on the frame 4. 2, the mounting member is positioned. For this reason, the prism 1 is positioned with respect to the frame 4.

Therefore, the prism 1 can be accurately positioned with respect to other elements of the optical system. That is, it can be positioned with respect to the image forming section including the lens 25, the filter wheel 26, the lens 28, the DMD 27, and the lens 35 attached to the same frame 4, and has a predetermined relationship with the frame 4. Light sources 30, 31 and lenses 32 attached to another frame body positioned as
Positioning with respect to 33 is also possible. In this state, the screw 12 is passed through the screw through holes 7a and 7b from above and screwed into the screw hole 13. As a result, the mounting member 2 is fixed to the frame 4. Since the counterbore portions 7c and 7d are provided and the head 109 of the screw 12 does not protrude from the upper surface 2c, light from the light source is not blocked.

To remove the prism 1 from the frame 4, loosen the screw 12 and remove it together with the mounting member 2. Since it can be removed together with the mounting member 2, there is little possibility that the prism 1 will be damaged. Further, since the mounting member 2 is formed of a thermally conductive material, the prism 1 can be effectively cooled even if the prism 1 is heated by applying light from a light source.

In the above embodiment, the prism 1
The heat transfer sheet 8 is interposed between the third side surface 1c and the front surface 2d of the back plate portion 2b. However, even when the third side surface 1c is brought into direct contact with the front surface 2d, sufficient heat transfer is performed. Is
The heat transfer sheet 8 may be omitted. In addition, pin 5
And the mounting member 2 is provided with the pin holes 7a and 7b. On the contrary, the mounting member 2 may be provided with the pins and the frame 4 may be provided with the pin holes. Further, two protrusions 6a and 6
Although b is provided, only one (for example, 6a) may be provided.
In this case, the prism 1 is brought into contact with the upper surface 2c of the seat plate portion 2a, the front surface 2d of the back plate portion 2b, and the one protrusion (6a) for positioning.

Embodiment 2 FIG. 2 is a perspective view of a reflection prism and a mounting member of the projection display device according to the second embodiment of the present invention. 3, the same reference numerals as those in FIG. 1 indicate the same or corresponding members or portions. The reflecting prism and the mounting member are generally the same as the reflecting prism and the mounting member of FIG. 1, but the configuration of the mounting member is partially different. That is, the mounting member 9 has a large number of parallel radiating fins 9a on the back surface (the surface opposite to the front surface 2d) of the back plate 2b. The fins 9a extend vertically in the drawing. Since the radiation fins 9a are provided in this manner, the radiation area increases,
The cooling effect is improved.

Embodiment 3 FIG. FIG. 3 is a perspective view of a reflection prism and a mounting member of a projection display device according to Embodiment 3 of the present invention. 3, the same reference numerals as those in FIG. 1 indicate the same or corresponding members or portions. The reflecting prism 10 and the mounting member 11 of this embodiment are generally the same as the reflecting prism 1 and the mounting member 2 of FIG. 1, but the mounting member 11 does not have a back plate portion and is composed only of the seat plate portion 2a. In addition, the heat transfer sheet 8 is not provided, and a plurality of parallel heat radiation fins 10a are provided on the third side surface (1c) of the prism 10. These radiation fins 1
Reference numeral 0a extends in the vertical direction in the figure. The radiating fins 10a radiate heat generated in the prism 10.

In order to position the prism 10 with respect to the mounting member 11, the first bottom surface 1d of the prism 10 is brought into contact with the upper surface 2c of the seat plate 2a, and the front edge 2e is moved from the rear edge 2f side.
The prism 10 is advanced toward
Stop when the side surfaces 1a and 1b of the prism 10 engage the protrusions 3a and 3b, and at this position, the first bottom surface 1d of the prism 10
To the upper surface 2c of the seat plate 2a.

This embodiment can be applied to the case where the prism is made of glass, as in the first embodiment, but is particularly effective when the prism is formed of a metal having a good heat transfer property. Further, even if it is made of glass, it is sufficiently effective when the light from the light source is not so strong. In the above embodiment, if the cooling effect is sufficient by providing the radiation fins on the prism itself, the mounting member is not required to have thermal conductivity, and therefore the mounting member is made of a material having poor heat conductivity. May be formed.

Embodiment 4 FIG. FIG. 4 is a perspective view of a portion showing a reflection prism, a mounting member, and the like of a projection display apparatus according to Embodiment 4 of the present invention. 1 denote the same or corresponding members or portions. FIG. 5 is a perspective view showing a pressing member used in this embodiment. The prism and mounting member of this embodiment are generally the same as those of FIG. However, they differ in the following points. That is, the projection 3b that engages with the second side surface 1b of the prism 1 is not provided. Further, the first bottom surface 1d of the prism is not bonded to the upper surface of the mounting member. Instead, a holding member 17 is provided. The pressing member 17 extends along the second bottom surface 1e of the prism 1 and has a plate-like first pressing plate portion 17a having a triangular surface substantially the same as the second bottom surface 1e, and a first pressing plate portion. A first projection 18 projecting downward from the first projection 17a and engaging with the second bottom face 1e of the prism 1 is connected to one edge 17d of the first holding plate 17a, and the second side face 1b of the prism 1 Plate-shaped second holding plate portion 17 extending along
b and a second projection 19 projecting from the second holding plate portion 17b toward the second side surface 1b and engaging with the second side surface 1b.
And a plate-like connection plate portion 17c connected to the second edge portion 17e of the first holding plate portion 17a and in contact with the top portion 15c of the back plate portion 2b. The holding plate 17a and the connecting plate 17c extend in the same plane. The connection plate portion 17c is provided with a screw through hole 20, which penetrates this hole and
Is fixed by a screw 21 screwed into a screw hole (not clearly shown in the figure) formed downward from the top portion 15c of the back plate portion 2b. Connection plate 17c, holding plate 17
A and 17b have elasticity, and the projection 18 elastically presses the second bottom surface 1e of the prism 1 and the projection 19 elastically presses the second side surface 1b of the prism 1. In the illustrated example, the protrusion 18 has a hemispherical shape, and the protrusion 19 has a semi-columnar shape. Thus, the hemispherical or semi-columnar projection 18
And 19, the surface of the prism 1 is hardly damaged.

As described above, the light from the light source is applied to the region S near the ridge line 1f, but the pressing plate portion 17b
The projection 19 is provided at a position that does not block light impinging on the area S. Holding plate portions 17a and 17b, connection plate portion 1
7c, the projections 18 and 19 are integrally formed of an elastic plate-like material. For example, one leaf spring material is cut into a predetermined shape, drilled, and then bent along the bending line 17f. It is formed by folding along, and drawing to form 18 and 19.

In such a configuration, to mount the prism 1, first, the first bottom surface 1d of the prism 1 is brought into contact with the upper surface 2c of the seat plate portion 2a of the mounting member 15, and the third side surface 1c is attached to the back plate. The first side surface 1a is brought into contact with the projection 3a by contacting the front surface 2d of the portion 2b. Thereby, the prism 1 is positioned with respect to the mounting member 15. At this time, as described in the first embodiment, the heat transfer sheet 8 may be interposed between the third side surface 1c and the front surface 2d. Next, the holding member 17 is attached to the back plate portion 2b with the screw 21, and the projection 18 is engaged with the second bottom surface 1e.
Is engaged with the second side surface 1b. Thereby, the prism 1 is fixed. That is, the vertical movement is restricted by being interposed between the projection 18 and the upper surface 2c from above and below, and the horizontal movement is restricted by being interposed between the projection 19, the projection 3a and the front surface 2d from three sides. The mounting member 15 is positioned and fixed to the frame 4 in the same manner as described in the first embodiment.

Embodiment 5 FIG. FIG. 6 is a perspective view illustrating a reflection prism, a mounting member, and the like of a projection display apparatus according to Embodiment 5 of the present invention. 6, the same reference numerals as those in FIGS. 4 and 5 indicate the same or corresponding members or portions.
This embodiment has both the features of the fourth embodiment and the features of the second embodiment. That is, the reflecting prism, the mounting member, and the holding plate of this embodiment are generally the same as those shown in FIG. 4, but the configuration of the mounting member is partially different. That is, the mounting member 22 has a large number of parallel heat radiation fins 22a on the back surface (the surface opposite to the front surface 2d) of the back plate 2b. This fin 22a
Are extended in the vertical direction in the figure.

Since the radiating fins 22a are provided as described above, the radiating area is increased, and the cooling effect is improved. Also,
In the illustrated example, the radiating fins 22a are connected to the top 1
5c. By doing so, the cooling effect of the radiation fins is further improved. Further, the portion of the heat radiation fin that extends upward in the figure from the top is easily gripped, and can be used as a gripping portion when attaching or detaching the attachment member, thereby improving workability.

Embodiment 6 FIG. FIG. 7 is a cross-sectional view showing a reflection prism, a mounting member, and members arranged around the reflection prism and the mounting member of a projection display device according to a sixth embodiment of the present invention. FIG.
6, the same reference numerals as those in FIG. 6 indicate the same or corresponding members or portions. This embodiment is different from Embodiment 5 described above.
, A fan is provided above the reflecting prism to further improve the cooling effect.

FIG. 7 shows a frame 36 located above the prism 1 in addition to the frame 4. These frames 3
The frame 6 and the frame 4 are connected to each other to form a housing.
(Although the same applies to the first to fifth embodiments, the illustration is omitted.) The cooling fan 23 is attached to the upper frame 36. The fan 23 guides cooling air to the prism 1 and the mounting member 22, and the wind cools the prism 1 and the mounting member 22. The fan 23 may blow air from the outside of the housing toward the prism 1 or the like. Conversely, the fan 23 may send air from the inside of the housing toward the outside of the housing so as to surround the prism 1 or the like. It may be one that creates a flow of air.

As described in the third embodiment, in the first, second, fourth, fifth and sixth embodiments, a metal prism may be used as the reflection prism. In the above description, the expressions "upper surface" of the seat plate portion and "top portion" of the back plate portion of the mounting member are used, but these are for convenience of description, and the prism and the mounting member at the time of use are used. It is not intended to limit the direction.

On the other hand, the radiation fins 9a, 10a, 22a
It is advantageous to use one extending in the vertical direction from the viewpoint of promoting natural convection. Therefore, in the embodiment of FIGS. 2, 4 and 6, when the orientation (vertical direction) of the prism or the mounting member is different from the illustrated one, the extending direction of the fin with respect to the prism or the mounting member is different from the illustrated one. It is desirable to extend in the vertical direction in this manner.
When a fan that guides the air inside the housing to the outside is used as the fan 23, it is advantageous to install the fan above the prism in order to effectively use natural convection. Therefore, in such a case, in the embodiment of FIG. 7, when the orientation (vertical direction) of the prism and the mounting member is different from that shown in the drawing, the mounting position of the fan is made different from the drawing, and It is desirable to be located above.

In the above-described projection display apparatus, an example in which the DMD is used as the image forming means has been described. However, the present invention is not limited to this. For example, a liquid crystal light valve may be used.

[0048]

According to the first aspect of the present invention, since the reflecting prism is in contact with the heat conductive member, heat generated in the reflecting prism is transmitted to the heat conductive member, thereby cooling the reflecting prism. can do. Therefore, it is possible to prevent a reduction in image brightness on the screen due to a thermal destruction of the reflecting prism and a reduction in dimensional accuracy due to thermal deformation.

According to the second aspect of the present invention, the cooling effect of the heat conductive member is further enhanced.

According to the third aspect of the present invention, since the mounting member for holding the reflecting prism and the positioning means for positioning the mounting member on the frame are provided, it is easy and reliable without taking a complicated structure. The reflecting prism can be positioned relative to the image forming section.

According to the fourth aspect of the present invention, since the fixing means for detachably attaching the fixing member to the frame is provided, the reflecting prism can be removed from the frame together with the mounting member for maintenance or the like. Thus, the workability can be improved, and the possibility of damaging the surface of the reflecting prism during the work is small.

According to the fifth aspect of the present invention, positioning can be performed simply by inserting the pin into the hole.

According to the sixth aspect of the present invention, the first bottom surface is pressed against the first support surface, the third side surface is pressed against the second support surface, and the first side surface is pressed against the projection. Thereby, the reflection prism can be positioned with respect to the mounting member, and positioning is easy.

According to the seventh aspect of the present invention, by mounting the reflecting prism between the two projections, the reflecting prism can be positioned with respect to the mounting member.

According to the eighth aspect of the present invention, the use of the holding member can prevent the reflection prism from being detached from the attachment member, and furthermore, since the reflection prism is detachable, the reflection prism can be detached from the attachment member. Can be replaced.

According to the ninth aspect of the present invention, the positioning can be performed such that the reflection prism is sandwiched between the projection that contacts the first side surface and the portion that presses the second side surface.

According to the tenth aspect of the present invention, since the mounting member also cools the prism, it is possible to prevent the brightness of the image on the screen from lowering due to the rise in the temperature of the reflecting prism and the destruction of the prism.

According to the eleventh aspect of the present invention, the cooling effect of the mounting member is further enhanced.

According to the twelfth aspect of the present invention, since the reflecting prism is provided with the heat radiation fin, the rise in the temperature of the prism can be suppressed. Also, there is no need to separately provide a cooling member.

According to the thirteenth aspect, the reflecting prism can be cooled by the cooling air, and the temperature rise of the reflecting prism can be further suppressed.

[Brief description of the drawings]

FIG. 1A is a perspective view showing a reflecting prism and a mounting member used in a projection display according to a first embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line Ib-Ib of FIG. .

FIG. 2 is a perspective view showing a reflecting prism and a mounting member used in a projection display according to a second embodiment of the present invention.

FIG. 3 is a perspective view showing a reflecting prism and a mounting member used in a projection display device according to a third embodiment of the present invention.

FIG. 4 is a perspective view showing a reflecting prism and a mounting member used in a projection display according to a fourth embodiment of the present invention.

FIG. 5 is a perspective view showing a pressing member used in Embodiment 4 of the present invention.

FIG. 6 is a perspective view showing a reflecting prism and a mounting member used in a projection display according to a fifth embodiment of the present invention.

FIG. 7 is a sectional view showing a reflecting prism and a mounting member used in a projection display apparatus according to a sixth embodiment of the present invention.

FIG. 8 is a schematic diagram of a conventional projection display device.

FIG. 9 is a schematic diagram of a conventional projection display device using prism reflection.

[Explanation of symbols]

1,10 reflective prism, 2,9,11,15,22
Mounting member, 3 projections, 4, 36 frame, 5
Pin, 6 pin hole, 7 screw through hole, 8 heat transfer sheet, 12 screw, 13 screw hole, 14 screw head, 17 holding member, 18 hemispherical projection, 19
Half columnar projection, 20 screw through hole, 21 screw,
23 fans, 24, 30, 31 light sources, 25, 2
8, 32, 33 condenser lens, 26 filter wheel, 27 DMD, 29 screen, 35
lens.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 9/31 H04N 9/31 CF term (Reference) 2H042 CA07 CA17 2H089 HA40 QA06 5C060 BA03 BA09 BB13 EA01 GB06 HC17 HC22 JA27 JB06 5G435 AA12 AA17 BB17 CC12 DD02 DD04 EE05 FF07 GG01 GG03 GG10 GG13 GG26 GG28 GG41 GG44 GG46

Claims (13)

[Claims] A plurality of illumination light sources; a reflecting prism for combining light emitted from the plurality of illumination light sources; and receiving light combined by the reflecting prism to form an optical image corresponding to an image signal. A projection display device, comprising: an image forming unit for enlarging and projecting the image on a screen; and a heat conductive member formed of a heat conductive material and in contact with the reflection prism to cool the reflection prism. 2. The projection display device according to claim 1, wherein the heat conductive member includes a radiation fin. 3. A plurality of illumination light sources, a reflecting prism for combining light emitted from the plurality of illumination light sources, and receiving the light combined by the reflecting prism to form an optical image corresponding to an image signal. And an image forming unit that performs enlarged projection on a screen, a frame that holds the image forming unit, a mounting member that holds the reflective prism, and a positioning unit that positions the mounting member with respect to the frame. A projection display device comprising: 4. The projection display device according to claim 3, further comprising fixing means for removably attaching and fixing said attaching member to said frame. 5. The positioning means has a pin erected on one of the frame and the mounting member, and a pin hole provided on the other of the frame and the mounting member and fitted to the pin. 4. The projection display device according to claim 3, wherein: 6. The reflecting prism has a triangular prism shape having first, second and third side surfaces and first and second bottom surfaces, and the first and second side surfaces are formed of light from a light source. The mounting member has a first support surface in contact with a first bottom surface of the reflection prism, and a second support surface in contact with a third side surface of the reflection prism. The projection display device according to claim 3, further comprising: a projection protruding from the first support surface and engaging with a first side surface of the reflection prism. 7. Further, projecting from the first support surface,
The projection type display device according to claim 6, further comprising a second protrusion that engages with a second side surface of the reflection prism. 8. A pressing member, which is detachably fixed to the mounting member and has a portion for pressing the second bottom surface of the reflection prism.
3. The projection display device according to 1. 9. The projection display device according to claim 8, wherein the pressing member has a portion for pressing the second side surface of the reflection prism. 10. The reflection member according to claim 3, wherein the attachment member is formed of a heat conductive material, and contacts the reflection prism to cool the reflection prism.
The projection display device according to any one of the above. 11. The projection display device according to claim 10, wherein the attachment member includes a radiation fin. 12. A plurality of illumination light sources, a reflecting prism for combining light emitted from the plurality of illumination light sources, and receiving the light combined by the reflecting prism to form an optical image corresponding to an image signal. An image forming unit for enlarging and projecting the image on a screen; a frame for holding the image forming unit; and a unit for fixing the reflection prism to the frame pair. The prism includes a radiation fin. Projection display device. 13. A cooling fan for guiding cooling air to the reflection prism.
13. The projection display device according to any one of claims 12 to 12.