JPH05260419A - Screen and rear projection type projector - Google Patents

Abstract

(57) [Summary] [Purpose] The joint width on the screen of a rear projection type projector is eliminated to eliminate the discomfort caused by the break in the image when using a multi-screen. [Structure] After the screen units (2a to 2d) are arranged adjacent to each other, a pair of transparent plate members (4,
The large screen 2 is formed so as to be sandwiched and held in 5). Then, the screen 2 is mounted on the front surface as a screen of a multi-image projection system including, for example, four projectors 1a to 1d.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen and a rear projection type projector using the screen.

[0002]

2. Description of the Related Art A rear projection type projector can be used not only as an image display device by itself, but, for example, a plurality of rear projection type projectors are installed adjacent to each other in the vertical and horizontal directions to combine images displayed on a plurality of screens. It is also used as a so-called multi-billing board (multi-video system) that can perform various video effects. Since this multi-video system can effectively produce and display a video screen of an enlarged pattern directly on each projector screen (screen), it can give a strong impression to the viewer, and There is an advantage that sufficient image quality and brightness can be obtained.

By the way, for example, when a multi-display screen section is constructed by four rear projection type projectors 10a to 10d, the four display screens are arranged as shown in FIG. 6, and four screens form one large screen. To be done.
Then, the projectors 10a to 10d arranged vertically and horizontally in a predetermined number of rows and stages are, for example, stacked on the base K and installed in a predetermined place.

Here, each of the projectors 10a to 10d
A screen frame 12 is attached to each of the housings on the front side thereof, and the screen frame 12 holds a screen 11 formed of, for example, an acrylic plate. The holding method is, for example, as shown in FIG. The front side 12a is formed by being bent, and the holder 13 is fixed with the screw B, so that the screen 11 (11a, 11b) is held by being sandwiched by the bent portion of the front side 12a and the holder 13. .. The screen 11 is a two-plate type in which the inner screen 11b is Fresnel.

Alternatively, as shown in FIG. 8, the front side 12a of the screen frame 12 is not bent and the holder 14 is not bent.
There is also a system in which the screens 11a and 11b are held by being sandwiched between the holders 13 and 14 by fixing them with screws B.

[0006]

However, in the conventional screen 11 holding method in these projectors, the screen frame 12 (or the screen frame 12 and the holder 14) is exposed to the front surface side of the projector and becomes a frame portion of the screen 11. The width, so-called joint width W _F, needs to be about 5 mm as a minimum limit, and if the width is narrower than this, it is impossible to hold the screen 11 well.

Therefore, when a multi-display screen is constructed by such a projector as shown in FIG. 6, the space between adjacent projector screens has a joint width W _F × 2 as shown in FIG. 9, for example, 10 mm. A certain width is generated, which causes a break in the displayed image as illustrated.

[0008] Due to the break due to the joint width, the power of the displayed image is reduced, in some cases, it becomes unsightly, and relatively small characters and fine parts displayed in the image cannot be identified. There is also a problem that occurs.

[0009]

The present invention has been made in view of the above problems, and a plurality of screen units are arranged adjacent to each other in the screen plane direction to obtain a screen plane size. Each pair of transparent plates has a pair of transparent plates having a size substantially the same as the screen plane size formed in the state where the units are adjacent to each other, and the front and back surfaces of the plurality of screen units are adjacent to each other in the screen plane direction. A screen for fixing and holding each screen unit is formed by bringing the body into close contact, and a rear projection type projector is configured using this screen.

[0010]

With the screen of the projector, it is difficult to increase the plane size to a certain extent or more due to accuracy problems. By doing so, one large screen can be formed. Then, by arranging one or a plurality of units of projection mechanisms on the back of such a large screen, it is possible to construct a multi-image system for obtaining an enlarged image, a combined image, or the like.

In this case, the screen units are arranged adjacent to each other in the plane direction of the screen, and the transparent plate members are closely attached from the front and back sides of the screen units to hold the screen units in a sandwich shape, thereby forming a frame between the adjacent screen units. It is possible to completely eliminate the joint width that appears in a shape, and thus to eliminate the width of the break in the displayed image.

[0012]

1 is a perspective view showing a rear projection type projector 1 to which an embodiment of the screen of the present invention is adopted. Reference numerals 1a to 1d denote projector devices each having a built-in image projection mechanism having a projection image output unit and a lens mechanism, and these four projector devices are stacked as shown in the drawing to form a multi-image system.
For example, it is loaded on the base K.

Further, 2a to 2d are screen units on which images are projected by the respective projector devices 1a to 1d, and 3 is a screen unit having these four screen units, which is held in the surroundings. It is a screen frame mounted on the front side of 1a to 1d. The screen 2 is formed in a large screen size by arranging the screen units 2a to 2d adjacent to each other in the plane direction of the screen.

Each of the screen units 2a to 2d is shown in FIG.
As shown in (a) and (b) as a front view and a side view, the Fresnel lens 20 and a lenticular 21 that is in close contact with the front side of the Fresnel lens 20 are included, and the plane size (a ₁ × b ₁ ) is, for example, 800
It is about mm x 600 mm.

The structure of the screen 2 of this embodiment and the fixing method to the rear projection type projector 1 constituted by the projector devices 1a to 1d are shown in FIGS. 3 (a) and 3 (b). That is, after the screen units 2a to 2d are arranged in the plane direction so that their end face portions are closely contacted with each other without any gaps, the transparent plate 4 is closely contacted with the front surface side thereof as shown in FIG. The transparent plate 5 is also closely attached to the side so that the entire screen units 2a to 2d are sandwiched. The transparent plates 4 and 5 may be made of transparent plastic such as acrylic, polycarbonate, hard vinyl chloride, or glass.

In this case, since the plane size (a ₂ × b ₂ ) of the transparent plates 4 and 5 is larger than the plane size (2a ₁ × 2b ₁ ) of the entire screen units 2a to 2d, it is transparent. Screen unit 2 sandwiched between plates 4 and 5
Although a space is generated in the circumferential direction of a to 2d, the screen stopper 6 is disposed there over the entire circumference or in a required portion, and the screen stopper 6 allows the screen unit (2a to 2d) to be displaced from the adjacent state. The Fresnel lens 20 and the lenticular 21 in each screen unit 2a to 2d are prevented from being displaced. Further, the screen stopper 6 also has a dustproof function.

As described above, the screen 2 including the transparent plates 4 and 5, the screen units 2a to 2d, and the screen stopper 6 is held by the screen frame 3 around the entire periphery thereof. That is, since the outer peripheral portion of the transparent plate 4 is pressed from the inside against the stop portion 3a formed by bending the front surface side of the screen frame 3 into an L-shaped cross section,
The screen 2 is sandwiched and held by pressing the outer peripheral portion of the back surface of the transparent plate 5 by the screen stop portion 3b. The screen stopper 3b is, for example, a screw B.
It is attached to the screen frame 3 by ₁ .

The screen frame 3 holding the screen 2 in this manner is fixed to a predetermined portion of the cabinet 1G in the projector apparatuses 1a to 1d by, for example, a screw B ₂ , and the four projector apparatuses 1a to 1d are stacked as shown in FIG. It is attached to the entire front. That is,
The rear projection type projector 1 as a multi-image system is configured.

Here, I in FIG. 3 (a) indicates four projector devices 1a to which the screen 2 is attached.
1D shows the virtual screen size of a rear projection projector composed of ~ 1d. That is, a large screen size for four screen units can be obtained. Since the end faces of the adjacent portions of the screen units 2a to 2d are in close contact with each other, there is no joint width.

Therefore, by projecting an image as shown by the dotted line by the image projection mechanism 1T in the projector devices 1a to 1d as shown in FIG. 4, a large image without any discontinuity can be displayed and displayed. The reduction of the power of the image and the unsightly appearance are eliminated. Further, since the image is not cut into joints, it is suitable for displaying, for example, character information, and the rear projection type projector 1 of this embodiment is also useful as a computer display device. Furthermore, by mounting the transparent plate 4 on the front surface,
The effect of preventing scratches on the lenticular 21 also occurs.

FIGS. 5A and 5B show another embodiment of the screen 2. FIG. 5 (a) shows one lenticular 21 corresponding to four screen units 2a to 2d, that is, four Fresnel lenses 20 are arranged in the plane direction as in the above-mentioned embodiment, and then on the front surface thereof.
A lenticular 21 having a size corresponding to four Fresnel lenses 20 is closely attached. Of course, the transparent plates 4 and 5 are in close contact with and sandwiched between the four Fresnel lenses 20 and the lenticular 21. With this configuration, the strength of the screen 2 can be improved.

Further, FIG. 5B shows an example in which a plate-shaped transparent plate made of plastic or glass is not used on the front side of the screen units (2a to 2d). That is, the transparent film-like sheet 7 is brought into close contact with the front surface, and the peripheral portion 7a of the sheet 7 is folded back to the back surface of the transparent plate 5 to be adhesively fixed.

In the above embodiment, the projector devices 1a to 1d each having a video projection mechanism are provided separately.
Although these are arranged in two rows and two stages and a screen frame for holding the screen 2 is attached, the projector device is configured as a single device having a video projection mechanism of, for example, 4 units, and is provided on the front side. The screen 2 similar to that of each of the above-described embodiments may be mounted, or the screen frame may be formed integrally with the housing of the projector device. In addition, the image projection mechanism 1 for the screen 1 using four screen units
It is not always necessary to provide 4 units of T.

Further, the external shape, size, etc. of the projector of the present invention are not limited to those in the above embodiment.
Further, each screen unit is not limited to the two-plate type including a lenticular lens and a Fresnel lens. Further, the projection mechanism may be either a CRT projection device or a projection device using a liquid crystal panel as a light valve.

By the way, in the above embodiment, a screen is formed by using four screen units and
A rear projection type projector as a so-called four-sided multi-image system in which two projectors are stacked is given as an example, but of course, six-sided multi, nine-sided multi, 1
A two-sided multi, a six-sided multi, etc. are also possible, and there is no limit to the number of screens. However, as the number of screens increases and the size of the screen screens increases, it may be difficult to form the transparent plate. In such a case, a plurality of transparent plates may be joined at their end faces.

[0026]

As described above, in the screen of the present invention, after the screen units are arranged adjacent to each other, the transparent plate bodies are brought into close contact with and held between the front and rear surfaces of the screen units. Adjacent portions do not need to be provided with joints for joining, and there is an effect that the joints exposed on the front surface of the screen can be eliminated. Further, in the rear projection type projector of the present invention using this screen, Since there is no discontinuity in the image between the matching screen units, it is possible to represent small characters and fine parts, and it is possible to improve the power of the image and eliminate discomfort due to screen division.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a screen and a rear projection type projector of the present invention.

FIG. 2 is a front view and a side view of each screen unit of the screen of this embodiment.

3A and 3B are a front view and a structural view of the screen according to the present embodiment as viewed from the side.

FIG. 4 is an explanatory diagram of an image projection state of the present embodiment.

FIG. 5 is a structural diagram of a screen according to another embodiment of the present invention.

FIG. 6 is a perspective view of a multi-image system using a conventional rear projection type projector.

FIG. 7 is an explanatory diagram of a screen holding method of a conventional rear projection type projector.

FIG. 8 is an explanatory diagram of a screen holding system of a conventional rear projection type projector.

FIG. 9 is an explanatory diagram of a display image of a multi-image system using a conventional rear projection type projector.

[Explanation of symbols]

 1a, 1b, 1c, 1d Projector device 2 Screen 2a, 2b, 2c, 2d Screen unit 3 Screen frame 4,5 Transparent plate 6 Screen stopper 7 Sheet 20 Fresnel lens 21 Lenticular

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuhiko Nishiki 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation (72) Inventor Shigeo Matsumoto 6-735 Kitashinagawa, Shinagawa-ku, Tokyo No. Sony Co., Ltd. (72) Inventor Takuro Shimaken 5 Suzukawa, Isehara City, Kanagawa Prefecture Kiyofuji Co., Ltd.

Claims (2)

[Claims] 1. A screen of a rear projection type projector for displaying an image by projecting an image from one or a plurality of image projection mechanisms located on the back, wherein a plurality of screen units are arranged adjacent to each other in the screen plane direction. And a pair of transparent plate members having a plane size that is substantially the same as the screen plane size formed in a state in which the screen units are adjacent to each other, and in a state of being adjacent in the screen plane direction. A screen, characterized in that the transparent plate bodies are contacted in a sandwiched state from the front and back surfaces of a plurality of screen units. 2. A rear projection type projector that displays an image on a screen by projecting an image from one or a plurality of image projection mechanisms located on the back of the screen, wherein the screen has a plurality of screen units in a screen plane direction. And a screen plane size is obtained by adjoining, and the plane size has a pair of transparent plate bodies that have substantially the same size as the screen plane size formed in a state where the screen units are adjacent to each other, A rear projection type projector formed by contacting the respective transparent plate bodies in a sandwiched state from the front surface and the back surface of a plurality of screen units that are adjacent to each other in the screen plane direction.