JP3281754B2 - Projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art As a conventional display device, for example, Japanese Utility Model Application Laid-Open No. 61-171042 and Japanese Patent Application Laid-Open No.
As described in JP-A-8976, JP-A-1-134449, etc., a plurality of transmissive screens are arranged in multiple stages and rows to form one large screen, and a mirror and a projection unit are provided for each screen. 2. Description of the Related Art There is generally known a projection type display device which is arranged to project an image of each projection unit onto a corresponding screen via a mirror.

[0003]

By the way, in the above-mentioned prior art, since a unit for projecting an image on a screen arranged at an upper stage is located at a high place, when adjusting the image performance, the operation at a high place becomes dangerous. Is accompanied by
In order to enable workers to work safely even at high altitudes, it is necessary to secure a firm scaffold in the display device main body. However, in order to secure such a scaffold, physical space is required, and as a result, the depth dimension of the projection display device increases.

[0004] Further, since the support structure of the projection unit disposed inside the projection type display device is not taken into consideration, if the floor surface on which the device is installed has irregularities or the like,
The influence may cause distortion in the housing. Therefore, if there is such a distortion of the housing, when the projection unit is once pulled out of the housing during maintenance work and then installed again, the projection unit cannot be accurately returned to the original position. In this case, an optical displacement occurs in the projection unit. In order to prevent this, it is necessary to adjust the video performance each time the projection unit is moved in and out.

An object of the present invention is to provide a projection type display apparatus which can solve such a problem and make the operation such as adjustment of a projection unit easy and safe.

[0006]

[0007]

In order to achieve the above object, according to the present invention, each unit for projecting an image on each screen is arranged at the same inclination angle, and is arranged in an upper stage.
Projector unit to the bottom using the lifting device alone.
It is configured so that it can be lowered .

The present invention also relates to a projection unit arranged on the upper stage.
The knit is mounted on a cart with casters,
Movable to a position where the projection unit is arranged,
Image projection maintenance work of the projection unit arranged in the upper stage
Was made possible by using the screen arranged at the lower stage.
Things.

[0009]

[Function] The projection units are held on the mounting tables, all of which have the same inclination angle, are arranged so that the image can be focused on the lower screen, and the image performance is adjusted, and then the upper one of these projection units is projected. Even if the unit is moved to a position where the unit projects onto the upper screen, the image is focused on the upper screen. This eliminates the need to adjust the image performance of the upper projection unit at a high place, which is effective in terms of safety.

[0010]

[0011]

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

First, the appearance of the projection display device according to the present invention will be described with reference to FIG. However, 1 is a large screen 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.
A large screen screen 1 composed of individual transmissive screens 1a to 1d is provided. 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 mounted. As will be described later, a projection unit for projecting an image on each of the transmissive screens 1a to 1d is provided in the housing 2.

Here, the large screen screen 1 is 2
Although the transmission screen is constituted by a two-stage transmission screen, the invention is not limited to this. The transmission screen can be constituted by an arbitrary multi-stage multi-row arrangement.

FIG. 1 is a longitudinal sectional side view showing an embodiment of a projection display apparatus according to the present invention, wherein 2c is a bottom plate,
2d is an elevating device, 2e is an overhang, 3a and 3b are mirrors, 4a and 4b are projection units, 5a and 5b are mounting tables,
6a and 6b are casters, and portions corresponding to FIG. 2 are denoted by the same reference numerals.

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

Also, three casters 6b are attached to the bottom of the mounting table 5b (here, only two casters are shown),
These casters 6b allow the casters 6b to move on the bottom plate 2c. The elevating device 2d transports the mounting table 5b, on which the upper projection unit 4b is mounted, up and down.

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

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

FIG. 3A is an external perspective view of the mounting table 5b, and FIG. 3B is a bottom view of the mounting table 5b.
Reference numeral 7b denotes a roller, and portions corresponding to those in FIG.

2A and 2B, the mounting table 5b
The casters 6b are attached to three different points on the bottom surface. The mounting table 5b is supported at three points on the bottom plate 2c in FIG. 1 by the casters 6b arranged as described above. The same applies to the mounting table 5a on which the lower projection unit 4a is mounted.

The casters 6 are provided on the side of the mounting table 5b.
a positioning member 7a is provided in the vicinity of each of the b.
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 of the housing 2 with the lower projection unit 4a and the upper unit 4b mounted. Since the casters 6a and 6b are attached to the mounting tables 5a and 5b, respectively, the mounting table 5a placed on the bottom plate 2c can be pulled out of the housing 2, and the mounting table 5b is connected to the mounting table 5b in FIG. As shown in (2), it is lowered to the bottom of the housing 2 by the lifting device 2d,
What is necessary is just to pull out on the bottom plate 2c so as to pass through the lifting device 2d or around the lifting device 2d.

FIG. 5 is a perspective view showing the inside of the housing 2 with the top cover, the large screen screen 1, and the panels 2a and 2b removed, wherein 2e is an overhang portion, 2f is a partition, 2g is a screen mounting portion, and 2h. Is a panel mounting portion, 17a is a lifting device 2d
Guide rail.

In FIG. 1, a partition 2f is provided in the housing 2 to partition the inside in the horizontal direction.
The upper and lower projection units are arranged one by one in the space defined by the. 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 separated by the partition 2f.

An elevating device 2d is provided in each of these spaces, and a guide rail 1 constituting the elevating device 2d is provided.
7a is provided on the partition wall 2f and the inner wall surface of the casing 2 facing the partition wall 2f.
Each is mounted vertically and parallel. 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 is raised or lowered along the guide rail 17a.

As is clear from FIG. 4, the mounting table 5b is arranged at a position deeper than the guide rail 17a. Mounting stand 5b
Is provided with a horizontal overhang 2e at the same predetermined height as the partition 2f and the inner wall surface of the casing 2 facing the partition 2f. The height of the overhang 2e Corresponds to the height at which the mounting base 5b is set. As described later, the overhang portion 2e is provided with a unit that acts on a positioning member 7a (FIG. 3) provided on the mounting table 5b to regulate 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 cutout, 17b is a winch, 17c is a wire, 1
7d is a pulley, 17e is a hook, 18 is a beam, and portions corresponding to the above-mentioned drawings are denoted by the same reference numerals.

In the same figure, guide rails 17a on both sides
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 eye bolt 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 front side of the guide rail 17a in the drawing), and the beam 18 extends to the guide rail 17a side. A portion 2e is provided. The overhang portion 2e is set to have the same height as the overhang portion 2e provided on the partition wall 2f and 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 upper projection unit 4b is mounted
When mounting the mounting table 5b at a predetermined position in the housing 2, the mounting table 5b is pushed in the direction of arrow A with the direction opposite to the direction shown in the drawing, and the rollers 7c of the mounting table 5b are fitted into the guide rails 17a. I do. Then, the hook 17e is hooked on the eyebolt 7c attached to the mounting base 5b, and the winch 17b is operated, thereby pulling the wire 17c through the pulley 17d and pulling up the mounting base 5b.
The upper and lower rollers 7b are provided on both sides of the mounting table 5b, respectively, and these are fitted into the guide rails 17a and the mounting table 5b is lifted up, so that the mounting table 5b is maintained in a horizontal state.

As described above, when the mounting table 5b is raised to the overhang portion 2e in FIG. 5, it is supported and positioned at three points as described later, and the hook 17e is detached from the eye bolt 7c. The winch 17b is used to similarly lift the other upper mounting table.
When the mounting table 5b is removed from the housing 2, the hook 17e is hooked on the eyebolt 7c, the positioning of the mounting table 5b is released, and the winch 17b is lowered by operating the winch 17b.
Lower to bottom plate 2c. Then, the hook 17e may be removed from the eyebolt 7c, and the mounting table 5b may be pulled out in the direction opposite to the arrow A.

The mounting tables 5a and 5b have exactly the same configuration, shape,
The lower projection unit 4a and the upper projection unit 4b have the same size. Then, a specified position on the bottom plate 2c of the mounting table 5a capable of correctly projecting an image from the lower projection unit 4a onto the lower transmissive screen 1a is defined as a first installation position, and an image from the upper projection unit 4b is correctly corrected. Assuming that a prescribed position at a prescribed height of the mounting table 5b capable of projecting on the transmissive screen 1b is a second installation position, even when the mounting table 5b is correctly placed at the first installation position on the bottom plate 2c. Each of the projection units 4 so that the image from the upper projection unit 4b on the mounting table 5b is correctly projected on the lower transmission screen 1a.
The set height h and the inclination angle θ of the a and 4b, the prescribed height of the mounting table 5b, the inclination and the 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 the upper projection unit 4b in the housing 2, as shown in FIG.
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. Thereafter, the direction of the mounting table 5b is reversed, and the mounting table 5b is lifted by the lifting device 2d to be disposed at the second installation position. Thereby, the upper projection unit 4b is set to a state where the image is correctly projected on the upper transmission screen 1b.

After the installation 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. Then, the image performance of the lower projection unit 4a is adjusted. Thereafter, the front panel 2a and the side panel 2b are attached to the housing 2, and the operation is completed.

As described above, 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, at the lower front side of the housing 2. It is not necessary to secure a foothold for adjustment work because work at height is not required, and the mirror 3 of the projected image of the lower projection unit 4a is not obstructed, making work very easy and safe. It becomes.

Since the mounts 5a and 5b are provided with the casters 6a and 6b, respectively,
It is very easy to take in and out a and 5b.

The housing 2 is distorted under the influence of the unevenness of the floor on which it is installed. When the distortion of the housing 2 causes distortion of the bottom plate 2c, cleaning of the rear surface of the large screen screen 1 (FIG. 1), the mirrors 3a and 3b, and the projection unit 4
The mounting tables 5a and 5b are mounted on the housing 2 for replacing parts a and 4b.
If the projection units 4a and 4b cannot be returned to their original positions with high accuracy, the projection state changes, such as a displacement of the image projected from the projection units 4a and 4b onto the transmissive screens 2a and 2b. Therefore, every time the projection units 4a and 4b are moved in and out, it is necessary to perform the work of their image performance, and the workability is reduced.

On the other hand, in this embodiment, the mounting table 5
Since a and 5b are in contact with the bottom plate 2c at three points by the casters 6a and 6b, the casters 6a and 6b are in contact on the same plane even if the casing 2 is distorted and the bottom plate 2c is distorted. Therefore, the influence of the distortion of the housing 2 can be eliminated. For this reason, when the mounting tables 5a and 5b are once pulled out of the housing 2 and installed in the housing 2 again, the mounting tables 5a and 5b can be accurately returned to the first and second installation positions, respectively. Thus, it is not necessary to adjust the video performance of the projection units 4a and 4b every time the mounting tables 5a and 5b are moved in and out, and the workability is improved.

Further, in this embodiment, 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 fixed to the inner surface of the housing 2. The positioning member 7a includes a wall surface that is inclined downward as it goes 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 overhang portion 2e formed on the inner wall surface facing the partition wall 2f are shown in FIG.
As shown in FIG. 7, the overhang 2e of the beam 18 shown in FIG.
A hinge 8 having an open / close 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 the hinges 8 are on the vertical movement trajectories 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. At the position where it is engaged with the through hole.

Here, the hinge 8 is normally kept horizontal, and is rotatable upward.

Then, when the mounting table 5b is raised by the lifting device 2d, the tapered side wall of the positioning member 7a contacts the hinge 8 at the sufficiently raised position and pushes up with the raising of the mounting table 5b. 8 returns from the positioning member 7a to the original horizontal state. Thereafter, the mounting table 5b is lowered to a specified height. As a result, the pin 8a fits into the through hole at the bottom of the positioning member 7a. The three positioning members 7a are similarly engaged with the pins 8a, so that the mounting table 5b is supported at three points at the second installation position and is stably positioned.

As described above, since the positioning member 7a engages with the pin 8a of the hinge 8, the mounting table 5b is
Even if it is removed from the housing 2 and is 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 can be omitted.

The mounting table 5a on which the lower projection unit 4a is mounted also has three casters 6a similarly to the mounting table 5b.
Are supported on the bottom plate 2c at three different points. For this reason, 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 it is taken in and out of the housing 2, the first
Can be accurately returned to the installation position, and the work of adjusting the video performance every time it is taken in and out can be omitted.

As shown in FIG. 7, the positioning member 7a
When the mounting base 5b is removed in a state in which the mounting base 5b is engaged with the pin 8a of the hinge 8, the mounting base 5b is once raised and the pin 8a is removed.
Is removed from the positioning member 7a, the hinge 8 is rotated upward so as not to hit the positioning member 7a, and then the mounting table 5b may be lowered. After the mounting base 5b is removed in this way, the hinge 8 is returned to the original horizontal state.

As shown in FIG. 8, a fitting 8b is fixed to the overhang 2e, and a hinge 8 is attached to the fitting 8b. The horizontal state of the hinge 8 is held by the metal fitting 8b. Therefore, a notch 8c is provided in a mounting portion of the hinge 8, and the mounting base 5b which moves up and down.
Of the positioning member 7a does not hit the metal fitting 8b. In addition, since the hinge 8 is horizontally supported by the metal fitting 8b, the mounting table 5b can be supported at three points.

FIGS. 9 and 10 are longitudinal sectional views showing another embodiment of the projection type display apparatus according to the present invention, and portions corresponding to FIG. 1 are denoted by the same reference numerals.

In these embodiments, the projection directions of all the projection units are the same. In the embodiment shown in FIG. 9, the projection direction of the upper projection unit 4b and the lower projection unit 4a is the same as the projection direction 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 the projection directions of the upper projection unit 4b in FIG. Other configurations are the same as those of the embodiment shown in FIG.

The embodiments of the present invention have been described above. However, the present invention is not limited to these 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 method of supporting the mounting table 5a on which the lower projection unit 4a is mounted at three points.
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 mounted on the bottom plate 2c, and the stopper 9 is provided with one tapered pin 9a serving as both positioning and supporting. Further, assuming that the transport direction when the mounting table 4a is mounted in the housing 2 is the direction of arrow B, two support tables 10 are provided on the front side of the stopper 9 (the direction opposite to the arrow B). These support bases 10 have a top surface that is a plane parallel to the bottom plate 2c, and tapered front and rear ends. Further, rollers 7d are mounted on the left and right sides of the mounting table 5a in the traveling direction of the arrow B.

Now, assuming that the mounting table 5a is pushed in the direction of arrow B in order to mount the mounting table 5a in the housing 2, the mounting table 5a
From the tapered end on the near side of the support 10
, And the caster 6a advances as it is floating from the bottom plate 2c. 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 fits into a hole (not shown) provided on the front surface of the mounting table 5a. Rollers 7d provided on both left and right sides of 5a are on the flat top surface of the support base 10.

In this way, the mounting table 5a is
And three points by the taper pin 9a and the caster 6a
From the bottom plate 2c by the height H. For this reason, the caster 6a can be simply made for easy conveyance, and its dimensional accuracy can be lowered.

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

The mounting table 5a on which the lower projection unit 4a is mounted is connected to the upper projection unit 4b as shown in FIG.
Positioning members 7 are provided at three places, similarly to the mounting table 5b for mounting
a, and together with this, as shown in FIG.
Is provided on the bottom plate 2c corresponding to each of the positioning members 7a, and the rolling ball 11a of the support base 11 is provided in the through hole of each of the positioning members 7a of the mounting table 5a.
May be fitted to position the mounting table 5a. 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.

Further, as a three-point support method of the mounting table 5b of the upper projection unit 4b, as shown in FIG. 13, nuts 12 are fixedly provided one by one on three sides of the mounting table 5b. The mounting table 5b is fixed within the housing 2 by fixing the mounting portions 2i at three places to the inner wall surface of the second and the partition wall 2f and screwing the bolts 13 to the nuts 12 with these.
Can support points.

Further, as shown in FIG. 14, holes 14 are provided on three side surfaces of the mounting table 5b, and three mounting portions 2i are fixed to the inner wall surface of the housing 2 and the partition wall 2f. The mounting table 5b is mounted on each mounting portion 2i by attaching a tapered pin 16 (which can be taken in and out by operating a screw 15) urged and held by a spring and fitting the tapered pin 16 into the hole 14. Three points may be supported.

[0059]

As described above, according to the present invention,
Each projection unit in the housing can be stably set at a predetermined position without being affected by distortion of the housing, and adjustment work of these projection units and maintenance work of each part can be performed safely and easily. And workability is greatly improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one 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.

FIG. 4 is a diagram for explaining how a mounting table on which the upper projection unit is mounted in the embodiment shown in FIG. 1 is taken in and out.

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

FIG. 6 is a schematic configuration diagram illustrating a specific example of a lifting device in FIG. 1;

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

FIG. 8 is an exploded perspective view showing a hinge attachment portion in FIG. 7;

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

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

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

12 is a diagram showing another specific example of the positioning means of the mounting table 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]

 DESCRIPTION OF SYMBOLS 1 Large screen screen 1a-1d Transmissive screen 2 Case 2a Front panel 2b Side panel 2c Bottom plate 2e Projection part 2d Lifting device 3a, 3b Mirror 4a Lower projection unit 4b Upper projection unit 5a, 5b Mounting stand 6a, 6b Caster 7a Positioning Member 7b Roller 8 Hinge 8a Tapered pin with flange

────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keiichiro Tanaka 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Information and Imaging Products Division, Hitachi, Ltd. (72) Inventor Yuki Furukawa 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa (72) Inventor Shinichi Furugane 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi Image Information Systems, Ltd. (56) References JP-A-6-78253 (JP, A) JP-A-5-328272 (JP, A) JP-A-5-72629 (JP, A) JP-A-5-344458 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G03B 21/10 G09F 9/00 360 H04N 5/74

Claims (2)

(57) [Claims] 1. Screens arranged in multiple stages and multiple rows and said screens
Mirrors arranged for each clean and each screen
A projection unit that projects images via the mirror is provided.
In the projection type display device, the respective projection units are arranged at the same inclination angle ,
The projection unit installed in the upper stage is used independently by an elevator
A projection display device characterized in that it can be lowered to the bottom . 2. The trolley with casters according to claim 1, wherein the projection unit disposed on the upper stage is a caster equipped with casters.
And the position of the projection unit arranged at the bottom
And use the screen provided in the lower stage.
And maintenance of the image projection of the projection unit
A projection display device characterized in that work is enabled .