JP3417492B2 - Transmission projection screen - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive projection screen in which a plurality of lens sheets are joined and supported in a plane direction, and more particularly to a transmissive projection screen suitable for a multi-screen projection device.

[0002]

2. Description of the Related Art A multi-screen projection device projects a large size image by projecting divided images from a plurality of sets of image sources (projectors) onto a plurality of sets of projection screens arranged corresponding to the respective image sources. Is a device for displaying, and the projection distance from the image source to the projection screen is relatively short,
Even though it can be installed in a space with a small depth, it produces a large image, and is widely used as an image display system at exhibitions and event venues.

Conventionally, this type of multi-screen projection device is constructed by arranging or stacking a plurality of projection devices in each of which one set of image source and one set of projection screen are contained in one box. It was In this multi-screen projection device, the plate material that constitutes each box is required to have strength so that each box does not deform. For this reason, it is difficult to reduce the thickness to 1 mm or less even when a metal plate or the like is used for the plate material, and when a plurality of projection devices are adjacent to each other, a part where the image cannot be displayed has a width of about 2 mm. It was

When a support frame is used to hold each projection screen, the screen made of resin such as polymethylmethacrylate and the metal support frame expand and contract due to changes in temperature and humidity of the installation environment. Since it is different in degree, it is necessary to provide a pressing tool having a width that allows for expansion and contraction of the screen, and it has been practically difficult to reduce the width of the joint portion between the screens to 5 mm or less.

On the other hand, the applicant of the present invention has already proposed a transmission type projection screen in which a plurality of lens sheets are adhered to each other at their end faces so that the joints are not conspicuous (Shokai 58-157317). issue).

[0006]

However, when a plurality of screen sheets (lens sheets) are adhered to each other at their end faces to form a large projection screen, the projection screen is simply held by a supporting frame as in the conventional case. Or
If you hang it from the top and hold it, when each screen sheet expands and contracts due to environmental changes such as temperature and humidity, the position of the bonded part will also move, so the joint part of the image will shift from the joint part of the screen, There is a problem that the joint portion of the screen is visually recognized and the image quality is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a transmission type projection screen in which the displacement of the joint portion of each screen sheet is small and the screen sheet is not warped or bent.

[0008]

In order to solve the above-mentioned problems, the first solution of the transmission type projection screen according to the present invention is to arrange a plurality of screen sheets in the plane direction of the image projection surface to obtain a plurality of images. A split video from the source of each
The plurality of screen sheets arranged corresponding to the image source
Multi-screen that projects a large size image on the screen
In a transmissive projection screen for a screen projection device , at least one joint between the screen sheets is
It is characterized in that it is provided with a holding means for restricting the movement in a direction substantially orthogonal to the connecting portion so as to be immovable and for holding the movement in a direction substantially parallel to the connecting portion.

A second solving means is characterized in that, in the transmission type projection screen of the first solving means, the holding means is provided outside an effective range on which an image of each screen sheet is projected.

A third solving means is attached to a light-entering side of a connecting portion of each screen sheet in the transmission type projection screen of the first or second solving means, and image lights from a plurality of image sources are overlapped. It is characterized by having a partition plate that shields it from being damaged.

In a fourth solution means, in the transmission type projection screen of the first or second solution means, a partition plate is attached to the most light-incident side so as to prevent image light from a plurality of image sources from overlapping. It is characterized in that a transparent substrate is arranged.

A fifth solution means is that, in the transmission projection screen according to any one of the first to fourth solution means, the screen sheet is surface-oriented to an ineffective part where an image of the peripheral part of the screen sheet is not projected. It can be characterized in that it is provided with a biasing means for biasing.

[0013]

In the present invention, the holding means holds the position of at least one joint among the joints of each screen sheet so that it does not move. Therefore, the position of the joint between each screen sheet and the joint between each image is fixed. No deviation occurs. That is, at least one position can be held so that the relative position with respect to the fixed portion such as the frame (that is, the relative position with respect to the image source) does not change. At this time, since the screen sheet is held so that it can be expanded and contracted, each screen sheet is not deformed such as warped or bent.

In particular, when four screen sheets are arranged in a cross-shaped pattern, it is possible to obtain a transmission type projection screen with no positional deviation of the connecting portion.

[0015]

The present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a diagram showing a first embodiment of a transmissive projection screen according to the present invention.
1A is a perspective view, and FIG. 1B is a cross-sectional view showing a joint portion of a screen sheet. In the first embodiment, four screen sheets 11 are pasted together in the shape of a letter with their end faces. As shown in FIG. 1B, the screen sheet 11 is, for example, a sheet in which a Fresnel lens shape 11a is formed on the light entering side and a lenticular lens shape 11b is formed on the light exiting side. is there.

A holding member 12 having a rectangular parallelepiped shape is attached to each screen sheet 11 in the vicinity of an intersection between a connecting portion (boundary) A between screens and a screen end portion B.
The holding member 12 is fixed by being sandwiched by the L-shaped jigs 13 attached to the frame body 14 so that the position of the boundary does not move in the direction orthogonal to the boundary. However, since the holding member 12 is movably supported in the depth direction (direction parallel to the boundary) of the L-shaped jig 13, each screen sheet 11 can be expanded and contracted. In addition, a spring 15 is attached to each screen sheet 11 between the screen end B and the frame body 14,
Even if each screen sheet 11 expands and contracts, the screen sheet 11 is pulled in the peripheral direction.

According to the first embodiment, even if each screen sheet 11 expands and contracts due to environmental changes, the screen sheets 11 do not warp or bend and can always be kept flat. .

FIG. 2 is a diagram showing a second embodiment of the transmission type projection screen according to the present invention. In each of the embodiments described below, the parts having the same functions as those of the first embodiment are designated by the same reference numerals and the duplicated description will be omitted as appropriate. In the second embodiment, the screen sheet 21 is a sheet in which the Fresnel lens shape is formed on the light incident side and the wrench shape is formed on the light emitting side, as in the first embodiment, and the end faces thereof are stuck together. However, in this embodiment, nine screen sheets 21 are stuck together to form a nine-sided multi-screen with three rows of upper and lower rows and three rows of left and right rows.

Also in this embodiment, a rectangular parallelepiped holding member 22 is attached to the screen end face corresponding to each of the vertical and horizontal boundaries of the screen sheet 21, and the L-shaped jig attached to the frame 24. By sandwiching it by 23, the position of the boundary is prevented from moving.
At this time, as in the first embodiment, since the L-shaped jig 23 moves in the depth direction, the screen sheet 21 can expand and contract. Further, since the spring 25 is attached between the screen sheet 21 and the frame body 24 to pull the screen sheet 21, the screen sheet 21 can be held flat without warping or bending.

In this case, the horizontal environment parts A11, A
12 and two vertical boundaries A21 and A22 each exist. However, if these two positions are fixed so as not to move, the screen sheet 21 cannot expand or contract. Therefore, in the second embodiment, 1 is set for each direction.
By fixing the two boundaries A11 and A21, the movement of the position due to the expansion and contraction of the screen sheet 21 can be reduced as compared with the conventional case.

FIG. 3 is a diagram showing a third embodiment of the transmission type projection screen according to the present invention. The third embodiment is an example that can be suitably used for a screen sheet 31 having a relatively thin thickness (for example, about 1 mm). Examples of such a screen sheet 31 include a lenticular lens sheet with a black stripe, which has a lenticular lens shape for condensing light on the light incident side and has a light-shielding portion formed on the non-light emitting portion on the light emitting side. .

In this case, since it is difficult to attach the rectangular parallelepiped holding member to the end surface of the screen sheet 31, as shown in FIG. 3, the holding member 32 is attached to the edge C of the screen surface. It is configured to be held down by the L-shaped jig 33. Further, since it is difficult to attach the spring 35 directly to the end surface of the screen sheet 31, the same rectangular parallelepiped holding member 3 is provided at the edge C of the screen surface.
6 is attached and the spring 35 is attached to it. Further, in this embodiment, since the boundary A of the screen sheet 31 is one place in the vertical direction, only that position is fixed.

FIG. 4 is a diagram showing a fourth embodiment of the transmissive projection screen according to the present invention. In the fourth embodiment,
A screen 48 is provided on the light incident side of the screen sheet 41 so that light from a plurality of projectors does not interfere with each other. For that purpose, a cut-off plate 48 is attached to the light incident side of the boundary A of each screen sheet 41. The transparent plate to which the dividing plate 48 is attached may be held in the same manner as the screen sheet 41 shown in FIG. 4 and arranged on the light incident side of the screen sheet 41.

The present invention is not limited to the embodiments described above, and various modifications and changes are possible, which are also included in the present invention. For example, in the case where the screen is composed of a plurality of screen sheets in which a Fresnel lens sheet is arranged on the light incident side and a lenticular lens sheet with a black stripe is arranged on the light incident side, each of the screen sheets is formed as shown in FIG. You can fix it like this.

In the case of the embodiment shown in FIG. 2, a means for restricting the position may be provided at the center of the side of each screen sheet 21 to keep the deviation at each boundary at a small value.

[0026]

As described above in detail, in the transmission type projection screen according to the present invention, the screen sheet is held so as to be stretchable while at least one position of the joint portion of the plurality of screen sheets is kept stationary. As a result, there is little displacement of the joint portion, and there is no warp or bending of the screen.

[Brief description of drawings]

FIG. 1 is a view showing a first embodiment of a transmission type projection screen according to the present invention, FIG. 1 (A) is a perspective view, and FIG.
(B) is a cross-sectional view showing a joint portion of the screen sheet.

FIG. 2 shows a second embodiment of the transmissive projection screen according to the present invention.

FIG. 3 is a diagram showing a third embodiment of the transmissive projection screen according to the present invention.

FIG. 4 is a diagram showing a fourth embodiment of the transmissive projection screen according to the present invention.

[Explanation of symbols]

11,21,31,41 Screen Sheet 12, 22, 32, 42 Holding member 13, 23, 33, 43 L-shaped jig 14, 24, 34, 44 frame 15,25,35,45 springs 36 Holding member 48 Shiki board

Claims (5)

(57) [Claims] 1. A divided image from a plurality of image sources, in which a plurality of screen sheets are arranged in a plane direction of an image projection surface.
To the plurality of screens arranged corresponding to each image source.
A machine that displays a large size image by projecting it on a lean sheet.
In a transmissive projection screen for a multi-screen projection device , at least one joint between the screen sheets is immovably restricted in a direction substantially orthogonal to the joint, and is moved in a direction substantially parallel to the joint. A transmissive projection screen comprising a holding means for holding the projection screen so that the projection screen can be held. 2. The transmissive projection screen according to claim 1, wherein the holding unit is provided outside an effective range in which an image of each screen sheet is projected. 3. The transmissive projection screen according to claim 1, wherein the screen projections are attached to a light-incident side of a joint portion of the screen sheets, and shield the image light from a plurality of image sources so as not to overlap each other. A transmissive projection screen, characterized by comprising a partition plate. 4. The transparent projection screen according to claim 1 or 2, wherein a transparent substrate having a partition plate for blocking image light from a plurality of image sources from overlapping is disposed on the most light-incident side. A transmissive projection screen characterized in that 5. The transmission type projection screen according to claim 1, wherein the screen sheet is attached to a non-effective portion of the peripheral portion of the screen sheet where the image is not projected, in the plane direction. A transmissive projection screen, comprising a biasing means for biasing.