JPH06102582A - Screen and back projection type projector - Google Patents

Abstract

PURPOSE:To eliminate the joint width of a back projection type screen and to remove the sense of incongruity caused by the break of a video in the case of preparing a multi-screen. CONSTITUTION:One screen unit is constituted by mutually fixing the specified positions of the abutting surfaces of Fresnel lenses 2a to 2c and a lenticular lens 3, or the Fresnel lenses 2a to 2c and the lenticular lens 3 and a grating-like light intercepting plate 5 with adhesive. Then, this screen unit is attached to a front surface as a screen for a multi-image projection system by four projector devices 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 arranged side by side in the vertical and horizontal directions to display images displayed on a plurality of screens. It is also used as a so-called multi-billing board (multi-video system) that can be combined to produce 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 composed of four rear projection type projectors 10a to 10d, as an example, they are arranged as shown in FIG. 9 and four screens form one large screen. To be done.
The projectors 10a to 10d arranged vertically and horizontally in a predetermined number of rows and stages are mounted on the base K, for example, 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 the 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 by 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 shows an example of a two-plate type in which the inner screen 11b is a Fresnel lens.

Alternatively, as shown in FIG. 11, the holder 1 without bending the front side 12a of the screen frame 12 is used.
There is also a method in which 4 is fixed with a screw B and the screens 11a and 11b are held in contact with each other by holders 13 and 14.

[0006]

However, in the conventional screen 11 holding system in these projectors, the screen frame 12 (or the screen frame 12 and the holder 14) is exposed to the front side of the projector and becomes a frame portion of the screen 11. The width, the so-called joint width W _F, needs to be about 5 mm as a minimum limit, and if the width is made 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. 9, the space between the screens of the projectors arranged side by side is shown in FIG.
As shown in FIG. 5, a joint width W _F × 2, for example, a width of about 10 mm 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 it becomes impossible to identify relatively small characters and fine parts displayed in the image. There is also a problem that occurs.

[0009]

The present invention has been made in view of the above problems, and a plurality of Fresnel lenses are arranged side by side in the screen plane direction to obtain a screen plane size. A lenticular lens having a size substantially the same as the plane size of the screen formed by arranging the Fresnel lenses side by side is provided, and a screen formed by fixing each Fresnel lens and the lenticular lens to each other with an adhesive is obtained. A rear projection type projector is configured using this screen.

Alternatively, a plurality of Fresnel lenses are arranged side by side in the screen plane direction to obtain a screen plane size, and the plane size is almost the same as the screen plane size formed in a state where the Fresnel lenses are arranged side by side. A lenticular lens and a light-shielding plate arranged so as to partition each Fresnel lens, and a screen formed by fixing each Fresnel lens, the lenticular lens and the light-shielding plate with an adhesive, A rear projection type projector is configured using this screen.

[0011]

A screen formed by fixing a plurality of Fresnel lenses arranged side by side in the screen plane direction and a lenticular lens having substantially the same size as the plane size with an adhesive, or a plurality of Fresnel lenses and a lenticular lens. By obtaining a screen that is formed by fixing the lens and the light-shielding plates that are placed so as to partition between each Fresnel lens with an adhesive, the joint width that appears like a frame between the display screens of adjacent screens can be reduced. Since it can be completely eliminated, the width of the break in the displayed image can be eliminated.

[0012]

1 is an exploded perspective view showing a rear projection type projector 1 to which an embodiment of a screen according to 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 therein. These four projector devices are stacked as shown in the drawing to form a multi-image system. It is loaded on the base K.

Reference numerals 2a to 2d are Fresnel lenses for deflecting light rays as images projected from the respective projector apparatuses 1a to 1d in a horizontal direction, and each plane size (a ₁ × b ₁ ) is, for example, about 800 mm × 600 mm. It is said that. Reference numeral 3 denotes a lenticular lens that diffuses the light rays that have passed through the Fresnel lenses, and in this case, it has the same size as the screen size obtained by arranging the Fresnel lenses 2a to 2d adjacent to each other in the plane direction. Reference numeral 4 denotes Fresnel lenses 2a to 2d and lenticular lens 3
It is a screen frame that holds a screen unit consisting of the surroundings and is mounted on the front side of each of the projector devices 1a to 1d.

In this embodiment, the respective joint surfaces of the Fresnel lenses 2a to 2d and the lenticular lens 3 are fixed by an adhesive (for example, methylene chloride) and integrated. That is, as shown in the front view of FIG. 2A, the Fresnel lenses 2a to 2d are adjacent to each other, and their joint surfaces are in close contact with each other. Then, as shown in the plan view of FIG. 2B, the lenticular lens 3 of the same size as the plane size obtained by arranging the Fresnel lenses 2a to 2d is closely attached to the Fresnel lenses 2a to 2d arranged in a plane. . At this time, one large screen unit is obtained by applying an adhesive to predetermined positions on these joint surfaces and fixing them together.

As is apparent from FIG. 2A, in this embodiment, a large screen size for four Fresnel lenses can be obtained. Since the end faces of the adjacent portions of the Fresnel lenses 2a to 2d are in close contact with each other with an adhesive, and the lenticular lens 3 can be regarded as one transparent plate, there is no joint width at all.

By using the screen unit thus obtained, for example, as shown in the perspective view of FIG. 3, a projection type projector having one large screen can be constructed.

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 the plan view of FIG. 4, it is possible to display a large image without any discontinuity. The reduction in the power of the displayed image and the unsightly appearance are eliminated. Also,
Since the image is not divided into joints, it is suitable for displaying, for example, character information, and the rear projection type projector 1 of the present embodiment is also useful as a computer display device.

At this time, in some cases, images may be projected as shown by the one-dot chain line in FIG. 4, and images of the width indicated by X may overlap, but this is caused by shifting the projection lens 6 in the arrow direction. There is no problem because it can be corrected by adjusting.

In the present embodiment, methylene chloride was used as an example of the adhesive from the viewpoint of strength, but other adhesives can naturally be used as long as the same effect can be obtained.

FIG. 5 is an exploded perspective view showing a rear projection type projector 1 to which another embodiment of the screen of the present invention is adopted, and the same components as those in FIG. 1 are designated by the same reference numerals. As shown in the figure, this embodiment is characterized in that it has a grid-shaped light shielding plate 5 in constructing a large screen unit. As the light shielding plate 5, for example, an acrylic plate that has been subjected to a light shielding process or the like is used.

FIG. 6 shows the structure of the screen unit of this embodiment. FIG. 6 (a) is a front view and FIG. 6 (b).
Is a rear view, and FIG. 6C is a plan view seen from above. As shown in these drawings, the Fresnel lenses 2a to 2d are arranged on the light-shielding plate 5 assembled in a lattice shape, and the joint surface Z (shown in FIG. 6C) on the lenticular lens 3 is a plane. Are arranged side by side in 2 rows and 2 columns. Then, the lenticular lens 3 of the same size as the plane size constituted by the Fresnel lenses 2a to 2d and the light shielding plate 5 is fitted to the Fresnel lenses 2a to 2d and the light shielding plate 5 at the joint surface Z.

At this time, the Fresnel lenses 2a to 2d, the light-shielding plate 5, and the lenticular lens 3 are bonded to each other at predetermined positions on the joint surface with an adhesive such as methylene chloride to fix them to each other to form one large screen unit. It is what constitutes.

In the case of this embodiment, since the light shielding plate 5 is formed in a lattice shape and the Fresnel lenses 2a to 2d and the lenticular lens 3 are adhered and fixed thereto, sufficient strength as a screen unit is obtained. You can

A projection type projector using the screen unit thus obtained is shown in FIG.
As shown in the perspective view of FIG. As can be seen from this figure, a large screen size for four Fresnel lenses can be obtained also in this embodiment, and each Fresnel lens 2a ...
The joint surfaces of the 2d, the light shielding plate 5, and the lenticular lens 3 are in a state in which predetermined positions are adhered to each other by an adhesive, so that there is no joint width. Therefore, it is possible to obtain a large-sized image without a cut portion.

Further, since the screen unit is provided with the light-shielding plate 5, as shown by the alternate long and short dash line in the plan view of FIG.
Even if the images projected by the image projection mechanism 1T in FIG. 2 spread, some of them do not overlap in the vicinity of the boundary Y of the screen. In addition to the adjustment of the projection lens in the direction of the arrow, it is possible to completely match the image breaks at the boundary Y of the screen as shown by the dotted line, and thus when projecting one large image on the entire screen unit. In addition, it is possible to easily obtain a video with a sense of unity, and in the case of projecting different images for each display screen, it is possible to obtain an image in which each image has a clear break. .

The light-shielding plate 5 can naturally be made of a material other than acrylic as long as its strength, light-shielding effect and the like can be obtained in the same manner as in this embodiment. As for the adhesive, other adhesives can naturally be used as described in the embodiment of FIG.

Further, in these embodiments, the projector devices 1a to 1d each having an image projection mechanism are formed separately, and these are arranged in two rows and two stages, and then the screen frame 4 for holding the screen unit is mounted. However, the projector device is configured as a single device having, for example, a four-unit image projection mechanism, and the same screen unit as that in each of the above-described embodiments is mounted on the front side thereof, or the screen frame 4 is also a projector. It may be formed integrally with the housing of the device. Further, it is not always necessary to provide four units of the image projecting mechanism 1T for a screen unit using four display screens.

Further, the outer shape, size, etc. of the projector of the present invention are not limited to the above-mentioned embodiments. Further, the structure of the lens portion of the screen unit is not limited to the two-plate type including a lenticular lens and a Fresnel lens as long as it can be fixed with an adhesive. 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 each of the above-mentioned embodiments, a rear projection type projector as a so-called four-sided multi-image system in which a screen is formed by using four display screens and four projectors are stacked is taken as an example. Of course, 6-sided multi, 9-sided multi, 12-sided multi, 16-sided multi, etc. are also possible, and the number of screens is not limited.

[0030]

As described above, the screen of the present invention is configured as one screen unit by fixing the Fresnel lens and the lenticular lens, or the Fresnel lens and the lenticular lens, and the light shielding plate to each other with an adhesive. Therefore, it is not necessary to provide a joint portion for joining the display screens to each other, and the joint 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 break in the image between the adjacent display screens, it is possible to express small characters and fine parts, improve the image power, and There is an effect that it is possible to eliminate discomfort due to division.

[Brief description of drawings]

FIG. 1 is an exploded 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 plan view of a screen unit according to the present embodiment.

FIG. 3 is a perspective view of a rear projection type projector of this embodiment.

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

FIG. 5 is an exploded perspective view of a screen and a rear projection type projector according to another embodiment of the present invention.

FIG. 6 is a front view, a rear view and a plan view of a screen unit of another embodiment.

FIG. 7 is a perspective view of a rear projection type projector according to another embodiment.

FIG. 8 is an explanatory diagram of an image projection state of another embodiment.

FIG. 9 is a perspective view of a multi-image system using a conventional rear projection type projector.

FIG. 10 is an explanatory diagram of a screen holding method of a conventional rear projection type projector.

FIG. 11 is an explanatory diagram of a screen holding method of a conventional rear projection type projector.

FIG. 12 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 2a, 2b, 2c, 2d Fresnel lens 3 Lenticular lens 4 Screen frame

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiko Ota 6-735 Kitashinagawa, Shinagawa-ku, Tokyo Sony Corporation

Claims (4)

[Claims] 1. A screen of a rear projection type projector which displays an image on a screen by projecting an image from one or a plurality of image projection mechanisms located on the back, wherein a plurality of Fresnel lenses are arranged side by side in the plane direction of the screen. And the screen plane size is obtained, and the plane size has a lenticular lens that is approximately the same size as the screen plane size formed in a state in which the Fresnel lenses are arranged side by side, and the Fresnel lenses and A screen formed by fixing the lenticular lenses to each other with an adhesive. 2. In a screen of a rear projection type projector which displays an image on a screen by projecting an image from one or a plurality of image projection mechanisms located on the back, a plurality of Fresnel lenses are arranged side by side in the plane direction of the screen. The screen plane size is obtained by dividing the Fresnel lens into a lenticular lens having a plane size substantially the same as the screen plane size formed when the Fresnel lenses are arranged side by side. And a light-shielding plate arranged as described above, the screen being formed by fixing each Fresnel lens, the lenticular lens, and the light-shielding plate to each other with an adhesive. 3. 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 Fresnel lenses in a screen plane direction. And a screen plane size is obtained by arranging them side by side, and the plane size has a lenticular lens that is substantially the same size as the screen plane size formed in a state where the Fresnel lenses are arranged side by side, A rear projection type projector, which is formed by fixing each Fresnel lens and the lenticular lens to each other with an adhesive. 4. 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 Fresnel lenses in a plane direction of the screen. And the screen plane size is obtained by arranging them side by side, and the plane size is approximately the same as the screen plane size formed when the Fresnel lenses are arranged side by side, and the Fresnel lenses. A rear projection type projector comprising: a light-shielding plate arranged so as to partition the lenses, and formed by fixing the Fresnel lenses, the lenticular lens and the light-shielding plate to each other with an adhesive.