JPH09325426A - Polarizing screen and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image as clear as possible by using a biaxial oriented film having the molecule orientation axis parallel with the drawing axis at the time of manufacture as a biaxial orientation diffusion film to form a polarizing screen. SOLUTION: A polarizing plate 2 is laminated and stuck on a reflecting material 1, and a biaxial orientation diffusion film 3 is laminated and stuck on the polarizing plate 2. A resin lump 6 (polypropylene resin) is drawn in biaxial directions X, Y, the drawn film is cut at positions 9 to 1/5 of the width of the film on both sides from the center line (m) of the film in parallel with the drawing axis X to obtain a lengthy biaxial oriented film 3', mat machining is applied to the surface of the oriented film 3', then it is cut at the prescribed length to obtain the orientation diffusion film 3. The molecule orientation axis (a) of the film 3' is set to parallel with the drawing axis X during the drawing manufacturing process of this film.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a polarizing screen and a method for manufacturing the same.

[0002]

2. Description of the Related Art Heretofore, there has been proposed an image display device comprising a liquid crystal projector 4 and a polarizing screen 5 capable of projecting a clear image even in a bright environment (indoors). The same components as those in the embodiment are designated by the same reference numerals.).

The liquid crystal projector 4 irradiates a polarizing screen 5 arranged oppositely with light vibrating in one direction (direction b in FIG. 1), and the polarizing screen 5 is also provided.
Is all the light emitted from the liquid crystal projector 4 and oscillating in one direction (light in an oscillating direction that matches the polarization axis c (transmission axis)) is transmitted to be guided to the reflector 1, and with respect to external light, Since only the light in the vibration direction that matches the polarization axis c is transmitted, a clear image can be displayed by the liquid crystal projector 4 and the polarization screen 5.

By the way, in the conventional polarizing screen, a polarizing plate 2 is laminated on the reflecting material 1 and attached, and further, a biaxially stretched diffusion film 3 described later is laminated on the polarizing plate 2 and attached. Generally (see FIG. 2).

This biaxially stretched diffusion film 3 has a resin block 6
Is formed by stretching in the biaxial directions X and Y, and the surface of which is subjected to a matting process to impart a diffusing action is appropriately cut (in place of the biaxially oriented diffusion film 3, a uniaxially oriented diffusion film is attached. Some are combined, but the mainstream is biaxially stretched diffusion film because of its good optical properties.)

The present inventors conducted various experiments and confirmed the following points.

In the conventional image display device, it is desirable that the polarization axis c of the polarizing plate 2 and the molecular orientation axis a formed during the production of the biaxially stretched diffusion film 3 are set to be exactly parallel or orthogonal to each other ( As shown in FIG. 4 (A), it is rare that they are exactly parallel or orthogonal to each other as a practical matter.
It was confirmed that a clear image could not be obtained due to the deviation between the molecular orientation axis a and.

That is, the light from the liquid crystal projector 4 is
Light that is twisted by the molecular orientation axis a of the biaxially stretched diffusion film 3 and that passes through the film and that does not match the polarization axis c of the polarizing plate 2 is absorbed by the polarizing plate 2, so that all of the light from the liquid crystal projector 4 is absorbed. However, since it does not pass through the polarizing plate 2, a clear image cannot be obtained (see FIG. 4 (B)).

Specifically, the biaxially stretched diffusion film 3 is
The biaxially stretched film 3'which is formed in a long length is cut into a predetermined length, and a portion having only a molecular orientation axis a parallel to the stretching axis X and a stretching axis are formed depending on the cutting method. A portion having a molecular orientation axis a at a predetermined angle with respect to X is formed, and a portion where the molecular orientation axis a has a predetermined angle with respect to the stretching axis X or the molecular orientation axis a becomes the stretching axis X. On the other hand, if a portion including a portion having a predetermined angle is used as the diffusion film 3, the above problem will occur when it is attached to the polarizing plate 2.

The present invention solves such a problem and provides a polarizing screen capable of obtaining an image as clear as possible and a method of manufacturing the same.

[0011]

The gist of the present invention will be described with reference to the accompanying drawings.

A polarizing screen formed by laminating a polarizing plate 2 on a reflecting material 1 and laminating a biaxially stretched diffusion film 3 on the polarizing plate 2 in a predetermined direction. And a biaxially stretched diffusion film 3 formed by using a biaxially stretched film 3 ′ having a molecular orientation axis a parallel to the stretching axis X at the time of manufacture. .

A polarizing screen formed by laminating a polarizing plate 2 on a reflecting material 1, and laminating a biaxially stretched diffusion film 3 on the polarizing plate 2 in a predetermined direction. , A long biaxially stretched film 3'obtained by cutting at both sides from the center line m of the film which is parallel to the stretching axis X at the time of production to about 1/5 of the width of the film, respectively. The present invention relates to a polarizing screen characterized by employing a biaxially stretched diffusion film 3 formed by using a long stretched film 3'formed by cutting it into a predetermined length.

From the long biaxially stretched film 3'formed by stretching the resin block 6 in the biaxial directions X and Y, a portion having a molecular orientation axis a parallel to the stretching axis X in the length direction is cut. The long biaxially stretched film 3 ′ obtained by this cutting is cut into a predetermined length, and the film 3 ′, the reflecting material 1, and the polarizing plate 2 are attached to the reflecting material 1 and the polarizing plate 2 is attached. A polarizing screen comprising the film 3'bonded on the polarizing plate 2 in a state where the polarizing axis c of the polarizing plate 2 and the molecular orientation axis a of the film 3'are parallel or orthogonal to each other to form a polarizing screen. The present invention relates to a manufacturing method of.

From the long biaxially stretched film 3'formed by stretching the resin block 6 in the biaxial directions X and Y, from the center line m of the film parallel to the stretching axis X in the longitudinal direction to both sides. Each of the films is cut at a position up to about 1/5 of the width of the film, and then the long biaxially stretched film 3'obtained by this cutting is cut into a predetermined length.
And the polarizing plate 2, the polarizing plate 2 is attached to the reflective material 1, and the polarizing axis c of the polarizing plate 2 and the molecular orientation axis a of the film 3 ′ are parallel to each other on the polarizing plate 2. Alternatively, the present invention relates to a method for manufacturing a polarizing screen, which is characterized in that the polarizing screens are laminated in a state of being orthogonal to each other to form a polarizing screen.

A polarizing screen is obtained by laminating a polarizing plate 2 on a reflecting material 1, and laminating a biaxially stretched diffusion film 3 on the polarizing plate 2 in a predetermined direction. A polarized light characterized by employing a biaxially stretched diffusion film 3 formed by using a biaxially stretched film 3 ′ having a molecular orientation axis a within a tilt angle of 5 ° with respect to a stretching axis X at the time of production. It relates to the screen.

[0017]

EFFECTS AND EFFECTS OF THE INVENTION Since the polarization axis c of the polarizing plate 2 and the molecular orientation axis a of the biaxially stretched diffusion film 3 are set to be parallel, all the light emitted from the liquid crystal projector 4 is polarized. It will pass through the plate 2.

Further, according to various experiments, if the position is from the center line m of the long biaxially stretched film 3'to each side to 1/5 of the width of the film, the molecular orientation axis a is the stretching axis X. It was confirmed to be parallel to.

Further, according to the experiment, the molecular orientation axis a is the stretching axis X.
On the other hand, it was also confirmed that a sufficiently clear image can be obtained when the inclination angle is within 5 °.

Since the present invention has been described above, since all the light from the liquid crystal projector 4 passes through the polarizing plate 2, the polarizing screen can obtain a clear image.

If a biaxially stretched diffusion film 3 having a molecular orientation axis a having an inclination angle of 5 ° or less with respect to the stretching axis X is adopted, a polarizing screen capable of obtaining a sufficiently clear image can be obtained.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS The drawings illustrate one embodiment of the present invention and are described below.

In the present embodiment, as shown in FIG. 2, a reflector 1 is formed by matting the upper surface by sandblasting and vapor-depositing aluminum (or silver) on the matt surface.
On the upper surface of the (PET film), the polarizing plate 2 (for example, PET
(Dye system) are laminated and laminated, and a biaxially stretched diffusion film 3 to be described later is provided on the upper surface of the polarizing plate 2 with a polarization axis c of the polarizing plate 2.
And the molecular orientation axis a of the biaxially stretched diffusion film 3 are laminated or laminated in a state of being parallel or orthogonal to each other.

A transparent urethane adhesive 8 is interposed between the layers of the respective members.

The biaxially stretched diffusion film 3 is obtained by stretching a resin block 6 (polypropylene resin) in biaxial directions X and Y as shown in FIG.
Long biaxial stretching obtained by cutting at a position from the center line m of the film which is parallel to the above to each one-fifth of the width of the film on each side (position 9 in FIG. 3). The film 3'is formed, and the surface of the biaxially stretched film 3'is subjected to mat processing and then cut into a predetermined length. The molecular orientation axis a of the film 3'is the stretching production process of the film. It is set parallel to the stretching axis X of.

Specifically, a stretched film having a width of 5 m is cut at positions 1 m on both sides from the center line m to obtain a biaxially stretched film 3'according to this embodiment.

Since this embodiment is constructed as described above, all the light from the liquid crystal projector 4 passes through the polarizing plate 2, so that a clear image can be obtained.

As a result of various experiments conducted by the inventors, the portions other than the biaxially stretched film 3 ', that is, the portions outside the reference numerals 9 and 9 in FIG. A biaxially stretched film obtained by cutting at a position up to a portion 10 having a molecular orientation axis a having an inclination angle of 5 ° or less or a portion 10 having a molecular orientation axis a having an inclination angle of 5 ° or less with respect to a stretching axis X. It has been confirmed that a sufficiently clear image can be obtained even when the biaxially stretched diffusion film 3 using 3'is attached to the surface of the polarizing plate 2.

Therefore, 1 m on both sides from the above-mentioned center line m
It is possible to use, as the effective portion, not the position (1) but the position where the molecular orientation axis a is within 5 ° with respect to the stretching axis X.

[Brief description of drawings]

FIG. 1 is an explanatory side view of a video display device.

FIG. 2 is an explanatory diagram of a configuration of a polarizing screen 5 according to this embodiment.

FIG. 3 is a production explanatory diagram of a biaxially stretched film 3 ′ according to this example.

FIG. 4 is a polarization axis c of a polarizing plate 2 and a biaxially stretched diffusion film 3.
It is explanatory drawing with the molecular orientation axis a.

[Explanation of symbols]

 X Stretching axis Y direction a Molecular orientation axis c Polarizing axis m Central line 1 Reflector 2 Polarizing plate 3 Biaxially stretched diffusion film 3'Biaxially stretched film 6 Resin block

Claims (5)

[Claims] 1. A polarizing screen comprising a polarizing plate laminated on a reflecting material, and a biaxially stretched diffusion film laminated on the polarizing plate in a predetermined direction. Molecular orientation axis a parallel to the stretching axis X of
A polarizing screen, wherein a biaxially stretched diffusion film formed by using the biaxially stretched film having the above is adopted. 2. A polarizing screen obtained by laminating a polarizing plate on a reflecting material, and laminating a biaxially stretched diffusion film on the polarizing plate in a predetermined direction. The long biaxially stretched film obtained by cutting at a position from the center line m of the film which is parallel to the stretching axis X to about 1/5 of the width of the film is cut to a predetermined length. A polarizing screen comprising a biaxially stretched diffusion film formed by using the long stretched film thus formed. 3. A lengthwise biaxially stretched film formed by stretching a resin block in biaxial directions X and Y, and a stretching axis X in the lengthwise direction.
A part having a molecular orientation axis a parallel to is cut, the long biaxially stretched film obtained by this cutting is cut into a predetermined length, and this film, the reflecting material, and the polarizing plate are placed on the reflecting material. A polarizing screen is obtained by laminating a polarizing plate and laminating the film on the polarizing plate in a state where the polarizing axis c of the polarizing plate and the molecular orientation axis a of the film are parallel or orthogonal to each other. Production method. 4. A lengthwise biaxially stretched film formed by stretching a resin block in biaxial directions X and Y, and a stretching axis X in the lengthwise direction.
After cutting at a position from the center line m of the film which is parallel to the film to each side up to about 1/5 of the width of the film, the long biaxially stretched film obtained by this cutting is cut into a predetermined length. Then, this film, the reflecting material, and the polarizing plate are laminated on the reflecting material, and the polarizing axis c of the polarizing plate and the molecular orientation axis a of the film are parallel to each other on the polarizing plate. A method for manufacturing a polarizing screen, comprising laminating the polarizing screens in an orthogonal state to form a polarizing screen. 5. A polarizing screen obtained by laminating a polarizing plate on a reflecting material, and laminating a biaxially stretched diffusion film on the polarizing plate in a predetermined direction. 2. A polarizing screen comprising a biaxially stretched diffusion film formed by using a biaxially stretched film having a molecular orientation axis a having an inclination angle within 5 ° with respect to the stretching axis X.