JP2001356419A - Transmission type screen device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission type screen device which is less deteriorated in image quality by a change in temperature and humidity and facilitates the management and handling of lens sheets. SOLUTION: The transmission type screen device of a rear projector comprising the lenticular lens sheet 1 and Fresnel lens sheet 2 which are at least two sheet-like members, is provided with a frame 3 having a screen holding mechanism which is capable of setting the angles of upper and lower (right and left) retaining segments of the respective sheet-like members respectively at different angles. This frame has a means capable of setting the angles of the upper and lower retaining segments in such a manner that the close-contact property between the respective sheet-like members increases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission screen device used for a rear projector.

[0002]

2. Description of the Related Art FIG. 3 is a horizontal sectional view showing a configuration of a transmission type screen device used in a rear projector according to a conventional example. An image projected from the projection projector 4 is projected on a screen including a Fresnel lens sheet 2 and a lenticular lens sheet 1 which are sheet-like members. The observer views the projection projector 4 from the opposite side (front side) of the screen. Fresnel lens sheet 2 and lenticular lens sheet 1
Are superimposed and fixed to the frame 3 to form a transmission screen device.

The Fresnel lens sheet 2 and the lenticular lens sheet 1 are mainly formed of a synthetic resin. The lens sheet expands and contracts due to distortion during molding and changes in temperature and humidity. Image failure. For this reason, a mounting technique for absorbing expansion and contraction of each sheet constituting the screen, a technique for bringing the sheets into close contact with each other, and the like have been developed.

For example, two lens sheets are formed into a convex or concave shape so that a gap between the sheets is hardly generated by combining the sheets (Japanese Patent Laid-Open No. 2-73341, Japanese Patent Laid-Open No.
(See Japanese Patent Application Laid-Open No. 6-118510, Japanese Patent Application Laid-Open No. 6-118510, and Japanese Patent Application Laid-Open No. HEI 6-118510). JP-A-8-237582
Reference).

FIG. 4 is a view showing an example of a conventional example of the countermeasure technique. Two sheets of a Fresnel lens sheet 2 and a lenticular lens sheet 1 are formed in advance so as to be in close contact with each other. It is fixed.

FIG. 5 is a view showing another example of the related art of the countermeasure technique. Two flat sheets (Fresnel lens sheet 2 and lenticular lens sheet 1) are shown.
Are fixed by the frame 3 so as to be convex in the same direction.

[0007]

However, in order to implement the countermeasure technique shown in FIG.
The lenticular lens sheet 1 needs to be heated and placed on a warp mold or the like, and it is difficult to handle the formed sheet having irregularities, such as transporting the sheet on a warp mold or the like. For this reason, a method has been adopted in which a lenticular lens and a Fresnel lens are overlapped in advance, and both are adhered to each other with an adhesive tape, and these are fixed to a frame body with metal fittings. Naturally, this countermeasure would increase the cost, and it was difficult to manage each lens sheet before incorporating it into the screen device.

In the countermeasure technique shown in FIG. 5, the lenticular lens sheet 2 and the lenticular lens sheet 2 are disposed between the lenticular lens sheet 1 and the lenticular lens sheet 2 by a change in temperature or humidity due to a difference in the material and thickness of the lenticular lens sheet 1. Gaps may occur. For this reason, an air layer is generated between the two lens sheets, so that light is refracted by the air layer, which may adversely affect an image.

[0009] The present invention has been made in view of the above problems, and there is little deterioration in image quality due to changes in temperature and humidity.
Further, it is an object of the present invention to provide a transmission screen device in which management and handling of a lens sheet are easy.

[0010]

In order to achieve the above object, a transmission screen apparatus of the present invention is a transmission screen apparatus for a rear projector comprising at least two sheet members. A screen holding mechanism that can set the angles of the upper and lower restraining portions to different angles, and a device that can set the angle of the upper and lower restraining portions so as to increase the adhesion between the sheet-like members. And

In the present invention, the transmission type screen device has a screen holding mechanism capable of setting angles of left and right restraining portions of the respective sheet-like members to different angles, respectively.
Means may be provided for setting the angle of the left-right restraining portion so as to increase the adhesion between the sheet-like members.

Further, it is preferable that the sheet-like member is a Fresnel lens sheet and a lenticular lens sheet.

[0013]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. [First Embodiment] FIG. 1 is a cross-sectional view showing a transmission type stirling apparatus according to a first embodiment of the present invention. Hereinafter, FIG.
The configuration and characteristics of the transmission screen device of the present embodiment will be described with reference to FIG.

In the transmission type screen apparatus according to the present embodiment, the angle of the vertical restraining portion of the Fresnel lens and the angle of the vertical restraining portion of the lenticular lens and the flat Fresnel lens sheet 2 and the lenticular lens sheet 1, which are sheet-like members, are set. It comprises a frame 3 having screen holding mechanisms set at different angles.

As shown in FIG. 1A, a lenticular lens sheet 1 and a Fresnel lens sheet 2 are used in the form of a flat plate. Then, as shown in FIG. 1B, by attaching the lenticular lens sheet 1 to the frame 3,
The lenticular lens sheet 1 has a concave warp with respect to the front surface. Next, the Fresnel lens sheet 2 is attached to the frame 3. The frame 3 has a Fresnel lens sheet 2
A holding mechanism is provided such that the warpage of the lenticular lens is generated in a convex shape with respect to the front surface. By attaching the Fresnel lens sheet 2, the lenticular lens sheet 1 and the Fresnel lens sheet 2 are arranged as shown in FIG. A screen device in close contact is configured. In FIG. 1 (c), the angle of the vertical holding portion is set to be different in the holding mechanism portion of the frame 3, so that the lenticular lens sheet 1
There is a gap between the lens and the Fresnel lens sheet 2. However, no practical problem occurs by setting the projected portion of the screen inside the gap.

As described above, the effects of the present invention can be obtained by setting the angles of the above-mentioned up-and-down holding portions (up / down holding metal fittings) so that the adhesion between the lenticular lens sheet 1 and the Fresnel lens sheet 2 is increased. Can be

[Other Embodiment] FIG. 2 shows a lenticular lens sheet 1 and a Fresnel lens sheet 2 according to this embodiment.
FIG. 9 is a cross-sectional view showing another combination set so as to increase the adhesion. In the above description, the screen holding mechanism in which the angle of the lenticular lens up / down holding bracket and the angle of the Fresnel lens up / down holding bracket are set to different angles has been described, but similarly, the angle of the lenticular lens left / right holding bracket and the Fresnel lens The same effect can be obtained by a screen holding mechanism in which the angles of the left and right holding brackets are set to different angles.

[0018]

As described above, according to the present invention,
By making the warping of the lenticular lens and the warping of the Fresnel lens different in the amount of warping or in the warping directions opposite to each other, the adhesion between them increases, and a gap is created between the lenticular lens and the Fresnel lens due to changes in temperature and humidity. And it has no effect on the image.

Further, there is no need to heat the Fresnel lens sheet or the lenticular lens sheet and place it on a warp mold or the like. Since it is not necessary to superimpose the two on each other and stick them together with an adhesive tape, it is possible to greatly improve the cost and delivery time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a transmission screen device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing another combination set to increase the adhesion between the lenticular lens sheet and the Fresnel lens sheet of the transmission screen device according to one embodiment of the present invention.

FIG. 3 is a horizontal sectional view showing a configuration of a transmission screen device used for a rear projector according to a conventional example.

FIG. 4 is a diagram showing an example according to a conventional example such as a mounting technique for absorbing expansion and contraction of each sheet constituting a screen, a technique for bringing sheets into close contact with each other, and the like.

FIG. 5 is a diagram showing another example of a conventional example such as a mounting technique for absorbing expansion and contraction of each sheet constituting the screen and a technique for bringing the sheets into close contact with each other.

[Explanation of symbols]

1: Lenticular lens sheet, 2: Fresnel lens sheet, 3: Frame, 4: Projection projector.

Claims (3)

[Claims] 1. A transmissive screen device for a rear projector comprising at least two sheet-like members, comprising a screen holding mechanism capable of setting angles of upper and lower suppressing portions of each of said sheet-like members to different angles. A transmission type screen device, comprising: means for setting an angle of the upper and lower suppressing portions so as to increase adhesion between the respective sheet-like members. 2. The transmissive screen device has a screen holding mechanism capable of setting angles of left and right restraining portions of the respective sheet members to different angles, thereby increasing the adhesion between the respective sheet members. The transmissive screen device according to claim 1, further comprising means for setting an angle of the left-right restraining portion as described above. 3. The transmissive screen device according to claim 1, wherein the sheet-shaped member is a Fresnel lens sheet and a lenticular lens sheet.