JPH0843949A - Transmission type screen - Google Patents

Abstract

PURPOSE:To enhance the adhesion accuracy of an acrylic plate, lenticular lens sheet, and Fresnel lens sheet by using silicone rubber having an adhesive function to the Fresnel lens sheet or the lenticular lens sheet. CONSTITUTION:A transmission type screen is made up of two sheets of a Fresnel lens sheet 1 and a lenticular lens sheet 2, and also the Fresnel lens sheet 1 is closely brought into contact with the lenticular lens sheet 2. Otherwise, the lenticular lens sheet 2 may be made up of silicone rubber having an adhesive function, and the Fresnel lens sheet 1 may be closely brought into contact therewith. As an another example, the Ienticular lens sheet 2 is made up by continuously arranging a large number of lenses to which projection light rays are projected in the horizontal direction, and also it is made up of silicone rubber having an adhesive function. Otherwise, in addition to the Fresnel lens sheet 1 and the lenticular lens sheet 2, an acrylic plate 3 on which a polarizing plate has been stuck so as to transmit the projected polarized light rays is added, so that they function as a screen made up of three sheets.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video projector for projecting an image on a screen, and more particularly to a screen member constituting a transmissive screen.

[0002]

2. Description of the Related Art A conventional transmissive screen will be described below with reference to FIG. As a member of a transmissive screen used in a projection device 5 such as a rear projection type projector that projects an image on the transmissive screen from the back side and observes the screen projected image from the screen front side, the observation surface, that is, the screen. A lenticular lens 8 in which a number of lens units are continuous on the surface, or a sheet (not shown) on which microlenses are formed,
A Fresnel lens sheet 7 for converging or converging the projection light to the lenticular lens sheet 8 or the microlens sheet is arranged on the projection device 5 side as a transmissive screen member, and the Fresnel lens sheet 7 and the lenticular lens sheet are provided. 8 or the above-mentioned microlens sheet is combined to function as a transmissive screen. These screen members are manufactured by molding acrylic, and after being assembled, they are pressed. Further, the thickness of each screen member is made as thin as possible so as not to reduce the resolution.

FIG. 5 is a conceptual view of a polarized light transmission type screen which projects polarized light. The projection device 6 is a liquid crystal projection device that magnifies and projects polarized light, such as a liquid crystal panel. An acrylic plate 3 with a polarizing plate attached is added to the structure in which the lenticular lens sheet 8 and the Fresnel lens sheet 7 shown in FIG. 4 are combined, and the acrylic plate 3 functions as a three-element screen. Acrylic plate 3 with the polarizing plate attached
Has a function of transmitting only the polarized light projected by the projection device 6 and absorbing more than half of the external light which is harmful to the image, and the thickness is made as thin as possible so as not to reduce the resolution. There is.

[0004]

However, in FIG. 4, since both the lenticular lens sheet 8 and the Fresnel lens sheet 7 are molded products and are made as thin as possible so as not to reduce the resolution, the screen size can be increased. The more it becomes difficult to obtain the plane accuracy from the strength, and when combined so as to function as a transmissive screen even if the requirements of each of the above-mentioned plane accuracy are satisfied, the lenticular lens 8 and the Fresnel lens are combined. Since the distance to the lens sheet 7 differs at each position and there is a case where the lens sheet 7 does not adhere to each other, it is necessary to perform press working after assembling. When the press processing was not carried out, the resolution was considerably reduced in the above-mentioned portion where the adhesion accuracy was poor.

Further, in FIG. 5, the acrylic plate 3 to which the polarizing plate is attached has a difficulty in obtaining the plane accuracy due to its strength as the screen size increases.
Even if the requirement of the plane accuracy of the acrylic plate 3 is satisfied, it is difficult to obtain the close contact precision between the acrylic plate 3, the lenticular lens sheet 8 and the Fresnel lens sheet 7 which are combined and pressed. there were. The resolution was considerably reduced in the part where the adhesion accuracy was poor.

[0006]

In order to achieve the above-mentioned object, the transmission type screen of the present invention collects projection light and emits it as substantially parallel light, and a Fresnel lens sheet which is emitted from the Fresnel lens sheet. A lenticular lens sheet that distributes the projection light in the horizontal direction, and one of the Fresnel lens sheet and the lenticular lens sheet is made of silicone rubber having a function of adhering. Further, in a liquid crystal projection device for enlarging and projecting polarized light, such as a liquid crystal panel, in order to achieve the above-mentioned object, a Fresnel lens sheet that condenses the projection light and emits it as substantially parallel light, and a Fresnel lens sheet that emits the light. It is characterized by comprising a lenticular lens sheet that distributes the projection light in the horizontal direction and an acrylic plate to which a transmissive polarizing plate is attached, and a silicone rubber having a function of adhering the lenticular lens sheet.

However, when the horizontal viewing angle may be narrow, it is composed of an acrylic plate to which a transmissive polarizing plate is attached, and a Fresnel lens sheet which collects the projected light and emits it as substantially parallel light. In addition, the Fresnel lens sheet is made of silicone rubber having a function of adhesion.

[0008]

According to the present invention having the above-mentioned structure, the Fresnel lens sheet and the lenticular lens sheet are combined together and then press-worked to bring them into close contact with the Fresnel lens sheet or the lenticular lens sheet. By using the silicon rubber thus made as a material, it is possible to make it adhere naturally.
As a result, it is possible to eliminate the press work after the combination and reduce the working cost.

Further, in the projection device for projecting the polarized light, the adhesion accuracy of the combination of the acrylic plate to which the polarizing plate is attached, the lenticular lens sheet and the Fresnel lens sheet has a function of adhering to the lenticular lens sheet between three sheets. By using the silicon rubber provided with the above as a material, it is possible to naturally adhere. Therefore, it is possible to provide a polarized light transmission type screen without resolution deterioration.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the transmission screen of the present invention will be described below with reference to the drawings.

FIG. 1 shows a Fresnel lens sheet 1 of the present invention.
It is a conceptual diagram of the 1st transmissive screen which implemented by combining with and the lenticular lens sheet 2. In FIG. 1, a projection device 5 is a projection device such as a CRT that enlarges and projects an image. The Fresnel lens sheet 1 makes the projection light substantially parallel or converges, and the lenticular lens sheet 2
Emit to. However, the Fresnel lens sheet 1 is made of silicone rubber having an adhesion function. The lenticular lens sheet 2 is made of an acrylic material in which a large number of lenses that distribute the projection light in the horizontal direction are continuously arranged. Thus, the first transmissive screen implemented in the present invention,
The Fresnel lens sheet 1 and the lenticular lens sheet 2 are composed of two sheets, and the Fresnel lens sheet 1 is in close contact with the lenticular lens sheet 2. However,
The lenticular lens sheet 2 may be made of silicon rubber having an adhesion function and may be brought into close contact with the Fresnel lens sheet 1.

FIG. 2 is a conceptual diagram of a second transmissive screen which is embodied by combining the Fresnel lens sheet 1, the lenticular lens sheet 2 and the acrylic plate 3 to which a polarizing plate is attached according to the present invention. In FIG. 2, a projection device 6 is a liquid crystal projection device for magnifying and projecting polarized light, such as a liquid crystal panel.
The Fresnel lens sheet 1 made of acrylic material collimates or converges the projection light and outputs the projection light to the lenticular lens sheet 2.

The lenticular lens sheet 2 is made of silicone rubber in which a large number of lenses that distribute the projection light in the horizontal direction are continuously arranged and have the function of adhesion. Further, in addition to the Fresnel lens sheet 1 and the lenticular lens sheet 2, an acrylic plate 3 to which a polarizing plate is attached so that projected polarized light is transmitted is added.
It works as a screen with three elements.

The acrylic plate 3 to which the polarizing plate is attached has a function of transmitting only polarized light projected from the projection device 6 and absorbing more than half of external light which is harmful to an image, and is thick. It is made as thin as possible so as not to reduce the resolution. However, the polarizing plate attached to the acrylic plate may be arranged on the lenticular lens sheet 2 side,
It may be on the observer side.

As described above, the second transmissive screen embodied in the present invention is composed of three pieces of the Fresnel lens sheet 1, the lenticular lens sheet 2 and the acrylic plate 3 to which the polarizing plate is attached, and the lenticular lens sheet. Two
Due to the adhesion function of, 3 sheets are in close contact.

FIG. 3 shows a third transmissive screen in which the lenticular lens sheet 2 composed of the second transmissive screen according to the present invention and the acrylic plate 3 to which the polarizing plate is attached are integrally formed. . Reference numeral 4 denotes a transmissive screen member (hereinafter referred to as an integrated polarizing plate) in which a lenticular lens and a polarizing plate are integrated. The Fresnel lens sheet 1 is made of silicon rubber having a cohesive function and is in close contact with the integrated polarizing plate 4. However, the polarizing plate attached to the acrylic plate is on the observer side.

[0017]

As described above, in the transmission screen of the present invention, the Fresnel lens sheet and the lenticular lens sheet, which are conventionally combined with each other by press working after combining the Fresnel lens sheet and the lenticular lens sheet, are used. By using silicone rubber, which has an adhesion function for the sheet, as a material, the sheet can be naturally adhered.

As a result, the press working after the combination can be eliminated, and the working cost can be reduced. Further, in a projection device for projecting polarized light, the adhesion accuracy obtained by combining an acrylic plate to which a polarizing plate is attached, a lenticular lens sheet, and a Fresnel lens sheet uses silicon rubber having a cohesive function in the lenticular lens sheet as a material. It can be improved.
Therefore, it is possible to provide a polarized light transmission type screen without resolution deterioration.

[Brief description of drawings]

FIG. 1 is a conceptual diagram of a first transmissive screen showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a second transmissive screen showing an embodiment of the present invention.

FIG. 3 is a conceptual diagram of a third transmissive screen showing an embodiment of the present invention.

FIG. 4 is a conceptual diagram of a conventional transmissive screen.

FIG. 5 is a conceptual diagram of a conventional polarized light transmission type screen.

[Explanation of symbols]

 1 Fresnel lens sheet 2 Lenticular lens sheet 3 Acrylic plate with a polarizing plate attached 4 Integrated polarizing plate 5 Projector 6 Liquid crystal projector 7 Fresnel lens sheet made of acrylic 8 Lenticular lens sheet made of acrylic

Claims (3)

[Claims] 1. A Fresnel lens sheet which collects projection light and emits it as substantially parallel light, and a lenticular lens sheet which distributes the projection light emitted from the Fresnel lens sheet in the horizontal direction. A transmissive screen made of silicone rubber that has the function of adhering either the sheet or the lenticular lens sheet. 2. A Fresnel lens sheet that collects projection light and emits it as substantially parallel light, a lenticular lens sheet that distributes the projection light emitted from the Fresnel lens sheet in the horizontal direction, and a transmissive polarizing plate. A transmissive screen made of silicon rubber, which is composed of an adhered acrylic plate, and the lenticular lens sheet has a function of adhesion. 3. A Fresnel lens sheet that collects projection light and emits it as substantially parallel light, and a lenticular lens sheet that distributes the projection light emitted from the Fresnel lens sheet in the horizontal direction, and is of a transmissive type. A transmissive screen composed of an acrylic plate having a polarizing plate attached thereto, and the Fresnel lens sheet made of silicone rubber having a function of adhesion.