JPH08271978A - Projection display device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the safety of assembly and adjustment work and greatly improve maintenance work. [Structure] Images of projection units 4a and 4b are projected on transmissive screens 1a and 1b, respectively. The lower projection unit 4a is mounted on the mounting table 5a at an angle θ at a height h from the bottom plate 2c.
Similarly, the projection unit 4b in the upper stage is also mounted on the mounting table 5a at a height h from the elevating plate 2e at an angle θ. The elevating plate 2e is conveyed up and down by the elevating device 2d. These mounting bases 5a and 5b are provided with three casters 6a and 6b, and are supported at three points by the bottom plate 2c and the elevating plate 2e, respectively. Further, the mounting base 5 is the bottom plate 2c.
When the image of the projection unit 4b mounted on the upper mounting table 5a is placed so as to be accurately projected on the lower screen 1a, the mounting table 5b is adjusted.
Is set to a prescribed position on the lift plate 2e, the image of the projection unit 4b is correctly projected on the upper screen 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type display device in which a plurality of transmissive screens for projecting an image for each of a plurality of projection units are arranged in multiple rows and columns.

[0002]

2. Description of the Related Art Conventional display devices include, for example, Japanese Utility Model Laid-Open No. 61-171042 and Japanese Patent Laid-Open No. 63-8.
As described in JP-A-8976, JP-A-1-134491, etc., a plurality of transmissive screens are arranged in multiple stages and multiple rows to form one large-screen screen, and a mirror and a projection unit are provided for each screen. There is generally known a projection display device that is arranged and projects an image of each projection unit onto a corresponding screen via a mirror.

[0003]

By the way, in the above-mentioned prior art, since the unit for projecting an image on the screen arranged in the upper stage is located at a high place, when the image performance is adjusted, work at a high place is dangerous. Is also associated with
In order for the worker to be able to work safely even at a high place, it was necessary to secure a firm foothold in the display device body. However, in order to secure such a scaffold, a physical space is required, and as a result, the depth dimension of the projection display apparatus becomes large.

Further, since the support structure of the projection unit arranged inside the projection display apparatus is not taken into consideration, if the floor surface on which the apparatus is installed has irregularities,
Due to the influence, distortion may occur in the housing. Therefore, if there is such distortion of the housing, the projection unit cannot be accurately returned to its original position when the projection unit is pulled out of the housing and then installed again for maintenance work. , Optical misalignment occurs in the projection unit. In order to prevent this, it is necessary to adjust the image performance of the projection unit each time it is taken in and out.

An object of the present invention is to provide a projection type display device which solves such a problem and makes it easy and safe to perform operations such as adjustment of the projection unit.

Another object of the present invention is to provide a projection type display device in which the influence of the distortion of the housing is eliminated and the mounting work of the projection unit can be simplified.

[0007]

In order to achieve the above object, the present invention is to arrange each unit for projecting an image on each screen at the same inclination angle.

Further, according to the present invention, each of the above projection units is supported by the display device casing at three points.

[0009]

[Function] The projection units are held by the respective mounting bases having the same inclination angle, arranged so that the image can be focused on the lower screen, and after adjusting the image performance, the projection of the upper stage of these projection units is performed. Even if the unit is moved to a position where it is projected on the upper screen, the image is focused on the upper screen. This eliminates the need to adjust the image performance of the projection unit in the upper stage at a high place, which is effective in terms of safety.

In addition, holding each projection unit on the mounting base,
Since the mounting base is supported at three points with respect to the housing, the installation surface is always flat, no matter how many times the projection unit mounting base is taken in and out of the housing during maintenance work or the like. That is, there is almost no optical misalignment without being affected by the distortion of the housing.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

First, the appearance of the projection display apparatus according to the present invention will be described with reference to FIG. However, 1 is a large screen, 1a to 1d are transmissive screens, 2
Is a housing, 2a is a front panel, and 2b is a side panel.

Referring to FIG. 1, the entire surface of the housing 2 is vertically and horizontally 2
A large-screen screen 1 composed of transmissive screens 1a to 1d is provided, and a front panel 2a is provided below the large-screen screen 1 and a side panel 2b is provided on the side surface of the housing 2 at the same height. Removably attached. In addition, as will be described later, a projection unit that projects an image on each of the transmissive screens 1a to 1d is provided in the housing 2.

In this case, the large screen 1
Although it is assumed that the transmissive screen has two rows of columns, the invention is not limited to this, and the screen can be composed of transmissive screens arranged in arbitrary multi-rows.

FIG. 1 is a vertical sectional side view showing an embodiment of a projection display apparatus according to the present invention, in which 2c is a bottom plate.
2d is an elevating device, 2e is an overhanging part, 3a and 3b are mirrors, 4a and 4b are projection units, 5a and 5b are mounting bases,
Reference numerals 6a and 6b are casters, and parts corresponding to those in FIG.

In the figure, the lower transmission screen 1 is shown.
Projection unit that projects an image on a (lower projection unit)
4a is mounted on the mounting base 5a, and a projection unit (upper projection unit) 4b for projecting an image on the upper transmissive screen 1b is mounted on the mounting base 5b. Three casters 6a are attached to the bottom of the mounting table 5a (only two are shown here), and these casters 6a enable movement on the bottom plate 2c of the housing 2.

Also, three casters 6b are attached to the bottom of the mounting base 5b (only two are shown here),
These casters 6b are adapted to move on the bottom plate 2c. The elevating device 2d is for vertically moving the mounting table 5b on which the upper projection unit 4b is mounted.

The lower projection unit 4a is mounted on the mounting table 5a at a predetermined height h and a predetermined inclination angle θ, and similarly,
The upper projection unit 4b is mounted on the mounting base 5b at the same height h as the lower projection unit 4a and at an inclination angle θ.

The image projected on the lower projection unit 4a is reflected by the mirror 3a and projected on the transmissive screen 1a, and the image projected on the upper projection unit 4b is reflected by the mirror 3b on the transmissive screen 1b. Is projected. In this way, an image is projected on each of the transmissive screens 1a to 1d in FIG. 2, and one image can be enlarged and displayed on the large screen 1.

FIG. 3A is an external perspective view of the mounting base 5b, FIG. 3B is a bottom view thereof, and 7a is a positioning member.
7b is a roller, and the parts corresponding to those in FIG.

In FIGS. 1A and 1B, the mounting base 5b
Casters 6b are attached to three different points on the bottom surface of the caster. With the casters 6a arranged in this way, the mounting table 5b is supported on the bottom plate 2c of FIG. 1 at three points. The same applies to the mounting table 5a on which the lower projection unit 4a is mounted.

Further, casters 6 are provided on the side surface of the mounting table 5b.
Positioning members 7a are provided in the vicinity of b, respectively.
Each roller 7b is provided.

The front panel 2a and the side panel 2 shown in FIG.
By removing b, the mounting tables 5a and 5b can be taken out from the housing 2 while the lower projection unit 4a and the upper unit 4b are mounted. Since the casters 6a and 6b are attached to the mounting bases 5a and 5b, respectively, the mounting base 5a placed on the bottom plate 2c can be pulled out to the outside of the housing 2, and the mounting base 5b is shown in FIG. As shown in FIG. 3, the lifting device 2d lowers it to the bottom of the housing 2,
The bottom plate 2c may be pulled out so as to pass through the elevating device 2d or surround the elevating device 2d.

FIG. 5 is a perspective view showing the inside of the housing 2 by removing the upper lid portion, the large screen screen 1, and the panels 2a and 2b. 2e is a projecting portion, 2f is a partition wall, 2g is a screen mounting portion, 2h. Is a panel mounting part, 17a is a lifting device 2d
It is a guide rail.

In the figure, a partition 2f is provided inside the housing 2 to laterally divide the interior, and the partition 2f is provided.
In the space divided by, the upper and lower projection units are arranged one by one. For example, a projection unit 4b that projects an image on the upper screen 1b in FIG.
A projection unit 4a for projecting an image on the screen 1a directly below the screen 1b is arranged in a space partitioned by the partition wall 2f.

A lifting device 2d is provided in each of these spaces, and the guide rail 1 constituting the lifting device 2d.
7a is formed on the partition wall 2f and the inner wall surface of the housing 2 facing the partition wall 2f,
They are mounted in parallel in the vertical direction. When the mounting table 5b is attached or detached as described with reference to FIG. 4, the roller 7b shown in FIG. 3 is fitted into the guide rail 17a, and the roller 7b is moved up or down along the guide rail 17a.

As is apparent from FIG. 4, the mounting table 5b is arranged deeper than the guide rail 17a. Mounting stand 5b
In the rear part where the is arranged, a horizontal projecting portion 2e is provided at the same predetermined height as the partition wall 2f and the inner wall surface of the housing 2 facing the partition wall 2f. Corresponds to the height at which the mounting base 5b is set. Then, as will be described later, the projecting portion 2e is provided with a means that acts on the positioning member 7a (FIG. 3) provided on the mounting table 5b to define the mounting table 5b at a predetermined position.

FIG. 6 is a schematic diagram showing a specific example of the lifting device 2d in FIG.
a1 is a notch, 17b is a winch, 17c is a wire, 1
Reference numeral 7d is a pulley, 17e is a hook, and 18 is a beam, and the same reference numerals are given to the portions corresponding to the above drawings.

In the figure, both guide rails 17a are provided.
Is provided on the mounting table 5b so that the roller 7b provided on the mounting table 5b can enter the guide rail 17a when the mounting table 5b passes between the guide rails 17a. A notch 17a1 is formed so that the positioning member 7a does not hit the guide rail. An eyebolt 7c is fixedly or detachably attached to the upper surface of the mounting table 5b.

A beam 18 is provided between the two guide rails 17a on the entrance side of the mounting table 5b (the surface of the guide rail 17a on the front side in the drawing), and the beam 18 extends to the guide rail 17a side. A section 2e is provided. The overhanging portion 2e has the same height as the overhanging portion 2e provided on the partition wall 2f or the inner wall surface of the housing 2 shown in FIGS. Of course, the mounting table 5b on which the upper projection unit 4b is mounted can pass through the beam 18.

Mounting table 5 on which the upper projection unit 4b is mounted
When mounting b at a specified position in the housing 2, the mounting base 5b is pushed in the direction of arrow A with the orientation opposite to that shown in the drawing so that the roller 7c of the mounting base 5b fits into the guide rail 17a. To do. Then, the hook 17e is hooked on the eyebolt 7c attached to the mounting table 5b, and the winch 17b is operated to pull the wire 17c through the pulley 17d and pull up the mounting table 5b.
Two rollers 7b are provided on each of the upper and lower sides of the mounting table 5b, and the rollers 7b are fitted into the guide rails 17a to pull up the mounting table 5b, so that the mounting table 5b is kept horizontal.

In this way, when the mounting table 5b rises to the projecting portion 2e in FIG. 5, it is supported and positioned at three points as described later, and the hook 17e is removed from the eyebolt 7c. The winch 17b is also used to similarly lift the other upper mounting bases.
Further, when removing the mounting base 5b from the housing 2, the hook 17e is hooked on the eyebolt 7c to release the positioning of the mounting base 5b, and the winch 17b is operated to lower it.
Lower to the bottom plate 2c. Then, the hook 17e may be removed from the eyebolt 7c, and the mounting base 5b may be pulled out in the direction opposite to the arrow A.

The mounts 5a and 5b have exactly the same configuration, shape,
The size is also the same for the lower projection unit 4a and the upper projection unit 4b. Then, the prescribed position on the bottom plate 2c of the mounting table 5a that can correctly project the image from the lower projection unit 4a on the lower transmissive screen 1a is set as the first installation position, and the image from the upper projection unit 4b is correctly displayed on the upper stage. When the prescribed position at a prescribed height of the mounting table 5b capable of projecting on the transmissive screen 1b is defined as the second installation position, even when the mounting table 5b is correctly placed at the first installation position on the bottom plate 2c. , So that the image from the upper projection unit 4b on the mounting table 5b is correctly projected on the lower transmissive screen 1a.
The set height h of a and 4b, the inclination angle θ, the prescribed height of the mounting base 5b, the inclination and position of the mirrors 3a and 3b, and the like are set.

Therefore, the mounting table 5a on which the lower projection unit 4a is mounted and the mounting table 5 on which the upper projection unit 4b is mounted
When mounting b in the housing 2, first, as shown in FIG. 4, a mounting table 5b on which the upper projection unit 4b is mounted.
Is inserted into the housing 2 and temporarily installed at the first installation position on the bottom plate 2c, and the image performance adjustment work of the upper projection unit 4b is performed. Then, the mounting table 5b is turned upside down and lifted by the lifting device 2d to be placed at the second installation position. As a result, the upper projection unit 4b is set to a state in which the image is correctly projected on the upper transmissive screen 1b.

When the installation work of the upper projection unit 4b is completed, the mounting table 5a on which the lower projection unit 4a is mounted is inserted into the housing 2 and set to the first installation position on the bottom plate 2c. , Perform image performance adjustment work of the lower projection unit 4a. Thereafter, the front panel 2a and the side panel 2b are attached to the housing 2 and the work is completed.

Thus, in this embodiment, the image performance adjustment work of the upper projection unit 4b is performed at the first installation position where the lower projection unit 4a is set, that is, the lower front side of the housing 2. Since it does not require work at a high place, it is not necessary to secure a scaffold for adjustment work, and the mirror 3 of the projection image of the lower projection unit 4a does not get in the way, and work is very easy and safe. Becomes

Further, since the mounting bases 5a and 5b are provided with casters 6a and 6b, respectively, the mounting base 5 in the housing 2 is
It is very easy to take in and out a and 5b.

The casing 2 is distorted under the influence of the unevenness of the floor on which it is installed. When the bottom plate 2c is distorted by the distortion of the housing 2, the rear surface of the large screen 1 (FIG. 1) and the mirrors 3a and 3b are cleaned and the projection unit 4 is cleaned.
The mounts 5a and 5b are mounted on the housing 2 to replace the parts a and 4b.
If the projection units 4a and 4b cannot be accurately returned to their original positions when they are taken in and out, the projection state changes such as the displacement of the projection images of the projection units 4a and 4b onto the transmissive screens 2a and 2b. Therefore, every time the projection units 4a and 4b are taken in and out, it is necessary to work on their image performance, and the workability is lowered.

On the other hand, in this embodiment, the mounting table 5
Since the casters 6a and 6b respectively contact the base plates 2a and 5b at three points, the casters 6a and 6b contact the same plane even if the housing 2 is distorted and the bottom plate 2c is distorted. Therefore, the influence of the distortion of the housing 2 can be eliminated. Therefore, when the mounting bases 5a and 5b are once pulled out from the housing 2 and installed again in the housing 2, the mounting bases 5a and 5b can be accurately returned to the first and second installation positions, respectively. As a result, it is not necessary to adjust the image performance of the projection units 4a and 4b each time the mounting bases 5a and 5b are taken in and out, and workability is improved.

Further, in this embodiment, as shown in FIG.
As shown in (b), positioning members 7a are provided near the casters 6b on the three side surfaces of the mounting table 5b, whereby the mounting table 5b is positionally fixed to the inner surface of the housing 2. The positioning member 7a includes a wall surface that slopes downward as it moves away from the side surface of the mounting table 5b, and a bottom surface provided with a through hole.

On the other hand, the partition wall 2f in the housing 2 shown in FIG. 5 and the overhanging portion 2e formed on the inner wall surface facing the partition wall 2f, FIG.
In the overhanging portion 2e of the beam 18 shown in FIG.
A hinge 8 with an opening / closing hinge is attached, and a tapered pin 8a with a flange is provided at the tip of the hinge 8. The pins 8a provided on these hinges 8 are on the vertical movement loci of the respective positioning members 7a when the mounting table 5b is raised in the arrow direction by the lifting device 2d as described above, and are provided on the positioning members 7a. It is in a position to engage with the through hole.

Here, the hinge 8 is normally kept horizontal and can be rotated upward.

Therefore, when the mounting table 5b is lifted by the lifting device 2d, the tapered side wall of the positioning member 7a abuts against the hinge 8 at a sufficiently elevated position and pushes it up as the mounting table 5b rises. 8 is removed from the positioning member 7a and returns to the original horizontal state. After that, the mounting table 5b is lowered to a prescribed height. As a result, the pin 8a is fitted into the through hole at the bottom of the positioning member 7a. Similarly, the positioning members 7a at the three positions engage with the pins 8a, so that the mounting base 5b is supported at three points in the second installation position and stably positioned.

As described above, since the positioning member 7a of the mounting base 5b engages with the pin 8a of the hinge 8, the housing 2 is temporarily suspended.
Even when the mounting base 5b is detached and mounted in the housing 2 again, the mounting table 5b can be accurately returned to the original second installation position, and the image performance adjustment work of the upper projection unit 4b for each mounting can be performed. It becomes possible to omit.

The mounting table 5a on which the lower projection unit 4a is mounted also has three casters 6a in the same manner as the mounting table 5b.
It is supported on the bottom plate 2c at three different points. Therefore, the mounting table 5b is supported by the bottom plate 2c at three points, and the influence of the distortion of the bottom plate 2c is eliminated. Therefore, the mounting table 5a
Also, even if the case 2 is taken in and out, the above-mentioned first
It can be accurately returned to the installation position of, and the work of adjusting the image performance for each withdrawal can be omitted.

As shown in FIG. 7, the positioning member 7a
When removing the mounting base 5b with the hinge 8 engaged with the pin 8a of the hinge 8, the mounting base 5b is temporarily lifted to lift the pin 8a.
Is removed from the positioning member 7a, the hinge 8 is rotated upward so as not to collide with the positioning member 7a, and then the mounting base 5b may be lowered. After removing the mounting base 5b in this manner, the hinge 8 is returned to the original horizontal state.

As shown in FIG. 8, a metal fitting 8b is fixed to the overhanging portion 2e, and a hinge 8 is attached to the metal fitting 8b. The horizontal state of the hinge 8 is held by the metal fitting 8b. Therefore, the notch 8c is provided in the mounting portion of the hinge 8 to move the mounting table 5b up and down.
The positioning member 7a is prevented from hitting the metal fitting 8b. Further, since the hinge 8 is horizontally supported by the metal fitting 8b in this manner, it is possible to support the mounting base 5b at three points.

FIGS. 9 and 10 are vertical sectional views showing another embodiment of the projection display apparatus according to the present invention, in which parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In these embodiments, the projection directions of all projection units are the same. In the embodiment shown in FIG. 9, the projection directions of the upper projection unit 4b and the lower projection unit 4a are the same as the projection directions of the lower projection unit 4a in FIG. 1, and the embodiment shown in FIG. The projection directions of 4a and 4b are the same as those of the upper projection unit 4b in FIG. The other configuration is the same as that of the embodiment shown in FIG.

Although the embodiments of the present invention have been described above, the present invention is not limited to such embodiments, and various modifications can be made without departing from the spirit of the present invention. Needless to say.

For example, FIG. 11 shows a three-point support method for the mounting table 4a on which the lower projection unit 4a is mounted.
This is a method different from the three-point support by the casters 6a shown in FIGS. 3 (a) and 3 (b).

That is, the stopper 9 is attached on the bottom plate 2c, and the stopper 9 is provided with one taper pin 9 for both positioning and support. Further, when the carrying direction when mounting the mounting table 4a in the housing 2 is the direction of arrow B,
Two supports 10 are provided on the front side of the stopper 9 (in the direction opposite to the arrow B). The top surface of each of these supports 10 is a bottom plate 2c.
It is a plane parallel to and the front and rear ends are tapered. Further, rollers 7d are attached to the left and right side surfaces of the mounting table 5a with respect to the traveling direction of the arrow B.

Now, if the mounting table 5a is to be pushed in the direction of arrow B in order to mount it inside the housing 2, the mounting table 5a
Is from the tapered end on the front side of the support base 10 to the support base 10.
The caster 6a advances as it is while floating from the bottom plate 2c. Then, when the front surface of the mounting table 5a comes into contact with the stopper 9, the taper pin 9a provided on the stopper 9 is fitted into a hole (not shown) provided on the front surface of the mounting table 5a. Rollers 7d provided on both the left and right sides of 5a ride on the flat top surface of the support 10.

In this way, the mounting table 5a is attached to the support table 10
And caster 6a supported at three points by taper pin 9a and
Is floated from the bottom plate 2c by a height H. Therefore, the casters 6a can be simply used for facilitating the conveyance, and the dimensional accuracy thereof can be lowered.

In addition, as described above, when adjusting the image performance of the upper stage projection unit 4b when the mounting table 5b is mounted in the housing, three points are similarly supported, and when the adjustment is completed, the mounting table 5b is fixed. By temporarily returning in the direction opposite to the arrow B and removing the stopper 9, the mounting table can be transported to the position of the lifting device 2d shown in FIG.

Further, as shown in FIG. 3, the mounting table 5a on which the lower projection unit 4a is mounted is replaced by the upper projection unit 4b.
Positioning members 7 are installed at 3 locations, similar to the mounting table 5b for mounting
a is provided, and together with this, as shown in FIG. 12, a rolling ball body 11a urged by a spring and retained and retained.
The support 11 to which the mounting members are attached is provided on the bottom plate 2c corresponding to each of the positioning members 7a, and the rolling ball members 11a of the supporting base 11 are inserted into the through holes of the positioning members 7a of the mounting base 5a.
Alternatively, the mounting table 5a may be positioned by fitting. Also in this case, as shown in FIG. 11, the casters 6a may be floated from the bottom plate 2c and supported at three points.

Furthermore, as a method of supporting the mounting base 5b of the upper projection unit 4b at three points, as shown in FIG. 13, nuts 12 are fixed one by one on the side surfaces of the mounting base 5b in three directions, and The mounting portion 2i is fixed to the inside of the housing 2 by fixing the mounting portions 2i at the three places to the inner wall surface of 2 or the partition wall 2f, and screwing the bolt 13 to the nut 12 with these.
Can support points.

Furthermore, as shown in FIG. 14, holes 14 are provided on three side surfaces of the mounting base 5b, and three mounting portions 2i are fixed to the inner wall surface of the housing 2 or the partition wall 2f. By mounting the taper pin 16 (which can be taken in and out by operating the screw 15), which is biased and held by a spring, to each of the mounting portions 2i, and by fitting the taper pin 16 into the hole 14, the mounting table 5b is mounted. You may make it support three points.

[0059]

As described above, according to the present invention,
Each projection unit in the housing can be stably set to a predetermined position without being affected by the distortion of the housing, and adjustment work of these projection units and maintenance work of each part can be performed safely and easily. This makes it possible to significantly improve workability.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a projection display apparatus according to the present invention.

FIG. 2 is an external perspective view of a projection display device according to the present invention.

FIG. 3 is a diagram showing a specific example of a mounting table on which the projection unit in FIG. 1 is mounted.

4A and 4B are views for explaining the loading and unloading of the mounting table on which the upper projection unit is mounted in the embodiment shown in FIG.

5 is a perspective view showing the inside of the housing in FIG. 2. FIG.

FIG. 6 is a schematic configuration diagram showing a specific example of the lifting device in FIG.

FIG. 7 is a cross-sectional view showing a specific example of positioning means for a mounting table on which the upper projection unit in FIG. 1 is mounted.

FIG. 8 is an exploded perspective view showing a mounting portion of the hinge in FIG.

FIG. 9 is a vertical sectional view showing another embodiment of the projection display apparatus according to the present invention.

FIG. 10 is a vertical sectional view showing still another embodiment of the projection display device according to the present invention.

FIG. 11 is a diagram showing a specific example of positioning means for a mounting table on which the lower projection unit in FIG. 1 is mounted.

FIG. 12 is a diagram showing another specific example of the positioning means of the mounting base on which the lower projection unit in FIG. 1 is mounted.

FIG. 13 is a diagram showing another specific example of the positioning means of the mounting table on which the upper projection unit is mounted.

FIG. 14 is a diagram showing still another specific example of the positioning means of the mounting table on which the upper projection unit is mounted.

[Explanation of symbols]

 1 large screen 1a-1d transmissive screen 2 housing 2a front panel 2b side panel 2c bottom plate 2e overhang 2d lifting device 3a, 3b mirror 4a lower projection unit 4b upper projection unit 5a, 5b mounting table 6a, 6b caster 7a positioning Member 7b Roller 8 Hinge 8a Tapered pin with flange

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Keiichiro Tanaka, Inventor Keiichiro Tanaka, 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Incorporated company, Hitachi, Ltd. Hitachi, Ltd. Information & Video Division (72) Inventor Shinichi Kogane, 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Prefecture

Claims (2)

[Claims] 1. A projection display device comprising a plurality of transmissive screens arranged in multiple rows and columns, wherein projection units for projecting an image are arranged at the same inclination angle on each of the screens. Projection display device. 2. The projection display device according to claim 1, wherein each of the projection units is supported by a display device housing at three points.