JPH07114105A - Polarizing screen - Google Patents

Abstract

PURPOSE:To improve the quality of a video projected on a large screen, to make the joining part of polarizing sheets inconspicuous and to prevent the optical characteristic of a screen surface from being deteriorated. CONSTITUTION:A polarizing plate in front of a screen reflecting film 5 is constituted of a uniconstitutional transparent substrate 1 and the plural polarizing sheets 2 and 3 stuck on the surface of the substrate 1 on the film 5 side. The plural sheets 2 and 3 are stuck on each other by mutually closely joining the adjacent sides thereof. Then, the film 5 is made to press-contact with the sheets 2 and 3 by enclosing the sheets 2 and 3 and the film 5 between the substrate 1 by an air-tight sheet 6 and the inside is evacuated. The thickness of the sheets 2 and 3 at the joining part 4 becomes extremely thin and the joining part becomes thin and inconspicuous at the video projected on the screen. Besides, since the film 5 and the sheets 2 and 3 are closely brought into contact with one another by evacuating the inside of the sheet 6, the optical characteristic is not deteriorated even in the case of the film 5 is the beads-type one.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polarizing screen capable of visually recognizing front projection image light in a bright environment.

[0002]

2. Description of the Related Art In a polarizing screen in which a polarizing sheet is provided on the front surface of a screen reflecting film, it is difficult to manufacture a large-area polarizing sheet. Therefore, a plurality of polarizing sheets are stuck together to form a large-area polarizing surface. There is. For example, in the case of a 100-inch class large-sized polarizing screen, two to three polarizing sheets are stuck together.

However, the polarizing sheet is extremely thin, and it is extremely difficult to attach the polarizing sheet with a large screen reflecting film surface in terms of manufacturing technology. Therefore, a method is generally used in which several multilayer sheets are manufactured by adhering a screen reflection film of an appropriate size and a polarizing sheet to each other and bonding them to each other with a large board surface. .

[0004]

However, in the above-mentioned conventional polarizing screen, the joint portion of the multilayer sheet has a thickness in which the screen reflection film and the polarizing sheet are overlapped with each other, and since that portion does not reflect image light, it is thick black. There was a problem of appearing as a line.

Further, in the above-mentioned conventional polarizing screen, since the screen reflection film and the polarizing sheet are directly adhered or adhered, in the case of a bead type screen, the optical characteristic of the screen reflection surface is improved by the adhesive or the adhesive. There was also the problem of deterioration.

The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to improve the quality of an image projected on a large screen. In particular, the seam portion of the polarizing sheet is inconspicuous and the screen surface It is to provide a polarizing screen that does not impair the optical characteristics.

[0007]

In the polarizing screen according to the present invention, a polarizing plate is provided on the front surface of a light reflecting film, and the polarizing plate has a size corresponding to the screen size of the screen and is a single transparent substrate. And a plurality of polarizing sheets adhered to the light reflecting film side surface thereof, and the plurality of polarizing sheets cover the light reflecting film side surface of the transparent substrate by adjoining adjacent sides without a gap. Characterize.

Further, the polarizing screen according to the present invention is formed by adhering one side of the transparent substrate to a transparent substrate having a size corresponding to the screen size of the screen and adjoining adjacent sides without a gap. The polarizing sheet and the light reflecting film are placed between the plurality of polarizing sheets, the light reflecting film placed on the polarizing sheets and the transparent substrate, and the light reflecting film is pressure-bonded to the polarizing sheet by depressurizing the inside. And an airtight sheet.

[0009]

[Function] Since a plurality of polarizing sheets are bonded and adhered to the surface of a transparent substrate having a single sheet structure, the seam portion has only a very thin thickness of the polarizing sheet, and the seam portion becomes thin and conspicuous in the screen projection image. Disappear. Further, by depressurizing the airtight sheet, the light reflection film and the polarizing sheet are brought into close contact with each other by the atmospheric pressure, so that the optical characteristics of the light reflection film are not impaired.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a plan sectional view showing the structure of a hard type polarizing screen which is a first embodiment of the present invention, and FIG. 2 is a plan sectional view showing a usage state in which the inside is depressurized in this embodiment. The vertical direction of the drawing is the width direction of the screen.

In FIG. 1, two polarizing sheets 2 and 3 are laminated on one surface of a transparent substrate 1 adjacent to each other in the width direction in a state where one side of each is joined without a gap,
It forms the polarizing plate of the polarizing screen. Polarizing sheet 2
The joint portion of 3 and 3 becomes the seam 4. Furthermore, the polarizing sheet 2
And 3, the screen reflection film 5 is placed at a position overlapping with the sealing film 7 and the airtight sheet 6 so as to seal them.
And is fixed to the transparent substrate 1.

Polarizing sheets 2 and 3 and screen reflecting film 5
Since they are not bonded to each other, a gap 9 exists inside the airtight sheet 6 in the state where the pressure is not reduced. In fact,
By reducing the pressure inside the airtight sheet 6, the screen reflection film 5 is moved to the polarizing sheet 2 by the atmospheric pressure as shown in FIG.
And 3 closely.

The transparent substrate 1 in this embodiment is of a hard type, and for example, organic glass such as acryl or ordinary inorganic glass can be used.

The polarizing sheets 2 and 3 are, for example, 100 μm
It can be formed with a certain thickness. Since these are attached on the transparent substrate 1 having a single sheet structure, the thickness of the seam 4 is only the thickness of the polarizing sheet. Therefore, the seam 4
The distance in the thickness direction of is extremely short, and as a result,
The line width of the black line appearing in the screen image becomes extremely thin and becomes inconspicuous due to the joint portion where the image light 10 cannot be reflected.

In this embodiment, two polarizing sheets 2 are used.
Although 3 and 3 are arranged in the width direction to form a polarizing plate, a required number of polarizing sheets may be used depending on the size of the screen.

Further, since the polarizing sheets 2 and 3 and the screen reflection film 5 are only brought into close contact with each other by being pressed by the atmospheric pressure, even if the screen reflection film 5 is a bead type, its optical characteristics are not impaired. Absent.

FIG. 3 is a plan sectional view schematically showing the construction of a roll-up type polarizing screen which is a second embodiment of the present invention, and FIG. 4 is a plan sectional view showing a usage state in which the inside is depressurized in this embodiment. It is a figure. The vertical direction of the drawing is the width direction of the screen.

In FIG. 3, the multilayer sheet 20 constituting the polarizing screen is wound and accommodated in the winding section 21, and the screen can be stretched by pulling out from the winding section 21. The screen portion of the multilayer sheet 20 includes a flexible transparent sheet 11, polarizing sheets 12 and 13,
It has a four-layer structure of a screen reflection film 15 and an airtight sheet 16.

On the inner surface of the transparent sheet 11 of one sheet, two polarizing sheets 12 and 13 are laminated adjacent to each other in the width direction in a state where one side of each is joined without a gap to form a polarizing plate of a polarizing screen. is doing. Polarizing sheets 12 and 13
The joint portion is the seam 14. Further, a screen reflection film 15 is placed so as to overlap the polarizing sheets 2 and 3, and an airtight sheet 16 is attached to the transparent sheet 11 by sealing portions 17 and 18 so as to seal them.

Since the polarizing sheets 12 and 13 and the screen reflection film 15 are not adhered to each other, a gap 19 exists inside the airtight sheet 16 in a state where the pressure is not reduced. Actually, by reducing the pressure inside the airtight sheet 16, as shown in FIG.
Is used in close contact with the polarizing sheets 12 and 13.

Also in this embodiment, as in the first embodiment, the seam portion of the polarizing sheet is inconspicuous, and even if the screen reflection film 15 is a bead type, the optical characteristics are not deteriorated. In addition to this, in this embodiment, since the extremely thin polarizing sheets 12 and 13 are laminated on the flexible transparent sheet 11 having a single sheet structure, the seam portion is also mechanically strong, and The winding of the portion 21 can be sufficiently endured.

In this embodiment also, the polarizing sheet is
The required number may be used according to the size of the screen.

[0024]

As described above in detail, in the polarizing screen according to the present invention, since a plurality of polarizing sheets are bonded and adhered to the surface of a single transparent substrate, a polarizing portion having a very thin joint is used. Only the thickness of the sheet becomes, and the seam portion becomes thin in the projected image on the screen and becomes inconspicuous. Furthermore, since the mechanical strength of the seam portion is improved, a winding type screen can be realized.

Further, since the light-reflecting film and the polarizing sheet are brought into close contact with each other by the atmospheric pressure by reducing the pressure inside the airtight sheet, even if a bead-type light-reflecting film is used, its optical characteristics are not impaired.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a configuration of a hard type polarizing screen that is a first embodiment of the present invention.

FIG. 2 is a plan cross-sectional view showing a usage state in which the inside pressure is reduced in the first embodiment.

FIG. 3 is a plan sectional view schematically showing the structure of a roll-up type polarizing screen that is a second embodiment of the present invention.

FIG. 4 is a plan cross-sectional view showing a usage state in which the inside pressure is reduced in the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transparent plate 2 Polarizing sheet 3 Polarizing sheet 4 Seam 5 Screen reflective film 6 Airtight sheet 7 Sealing part 8 Sealing part 9 Gap 10 Image light 11 Transparent sheet 12 Polarizing sheet 13 Polarizing sheet 14 Seam 15 Screen reflective film 16 Airtightness Sheet 17 Sealing part 18 Sealing part 19 Gap 20 Multilayer sheet 21 Winding part

Claims (7)

[Claims] 1. A polarizing screen in which a polarizing plate is provided on the front surface of a light reflecting film, wherein the polarizing plate has a size corresponding to the screen size of the screen and is composed of a single transparent substrate; It is composed of a plurality of polarizing sheets bonded to the surface of the reflective film side, and the plurality of polarizing sheets cover the surface of the transparent substrate on the light reflective film side by joining adjacent sides without a gap. Characteristic polarizing screen. 2. The polarizing screen according to claim 1, wherein the transparent substrate is a hard type transparent plate. 3. The polarizing screen according to claim 1, wherein the transparent substrate is a flexible transparent sheet. 4. A transparent substrate having a size corresponding to the screen size of the screen, and a plurality of polarizing sheets bonded to one surface of the transparent substrate with adjacent sides bonded together without a gap, By confining the polarizing sheet and the light reflecting film between the light reflecting film placed on the polarizing sheet and the transparent substrate, and depressurizing the inside, the light reflecting film and the polarizing sheet are pressure-bonded. A polarizing screen comprising an airtight sheet and. 5. The polarizing screen according to claim 4, wherein the light reflection film is a bead type light reflection film. 6. The polarizing screen according to claim 4, wherein the transparent substrate is a hard type transparent plate. 7. The polarizing screen according to claim 4, wherein the transparent substrate is a flexible transparent sheet.