JP2000171906A - Transmission type projection screen and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection screen having high light efficiency and a wide visual field angle while having a high contrast. SOLUTION: A diffusing agent-containing positive type photosensitive tacky adhesive layer 14a is stuck to the observation surface side of a light transparent screen 11 disposed with plural lenses 12. Exposed parts 15 are formed to the positive type photosensitive tacky adhesive layer 14a by a light source projected from the opposite surface of the observation surface. Light shieldable toners 16 are applied to the positive type photosensitive tacky adhesive layer 14a on the observation surface side of the screen 11 enclosing these exposed parts 15. The diffusing agent is previously added to the positive type photosensitive tacky adhesive layer 14a, by which, not only the work to stick the diffusion sheet is decreased but the transmission type projection screen performance of the wide visual field angle and the high contrast may be obtained as well.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a decrease in contrast caused by external light incident on the surface on the observation surface side of a transmission type projection screen even in the presence of daylight or room illumination light. The present invention relates to a transmission type projection screen capable of obtaining a stable projection image and a method of manufacturing the same.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open No. Sho 59-121033 discloses a conventional transmission type projection screen. In this manufacturing method, a positive photosensitive adhesive, that is, an adhesive whose adhesiveness is lost by exposure to light, is arranged on the observation surface side of a transmission type projection screen composed of a lenticular lens or a mosaic lens. Exposure of the adhesive with light rays projected from a projection light source or a light source having an opening equivalent thereto from the opposite surface, and after removing the adhesiveness of the condensing part of each unit lens of the lens system, on the observation surface A light-shielding layer of toner, and adhere to the unexposed and unexposed portions of the adhesive, and remove the toner that has just adhered to the portion that has become non-adhesive due to exposure and excess toner, thus requiring a wet process. An object of the present invention is to obtain a transmissive projection screen in which a pattern excellent in light-shielding properties is formed easily and inexpensively.

However, in order to put the above-mentioned conventional transmissive projection screen into practical use, a light diffusing sheet is attached to the observation surface side to impart light diffusing property as described in JP-A-10-83029. Need to match. This is because the light diffusing sheet is stuck to the observation surface side of the screen, but the contrast is remarkably reduced, despite the fact that the conventional example is manufactured by a manufacturing method for preventing a decrease in contrast. In other words, if the light diffusion sheet is formed on the observation surface side, it is liable to be reflected by external light, which is a problem as a factor of deterioration of contrast.

[0004]

The above-mentioned conventional transmission type projection screen requires not only the work of bonding a light diffusion sheet to the observation surface side, but also the reduction of contrast by bonding the light diffusion sheet. The viewing angle was narrowed.

SUMMARY OF THE INVENTION The present invention provides a transmissive projection screen having a high contrast, a high light efficiency, and a wide viewing angle, and a method for manufacturing the same.

[0006]

In order to solve the above-mentioned problems, a transmissive projection screen according to the present invention comprises a light-transmitting screen on which a lens such as a lenticular lens or a micro lens is formed, and an observation surface of the screen. Side, a positive photosensitive adhesive layer, an exposed portion formed on the positive photosensitive adhesive layer by a light source projected from a surface opposite to the viewing surface, and an observation surface of the screen surrounding the exposed portion. And a light-shielding toner applied to the positive photosensitive adhesive layer on the other side, and a diffusing agent is added to the positive photosensitive adhesive.

According to this means, the light diffusing agent added to the positive-type photosensitive pressure-sensitive adhesive layer makes it possible to achieve a wide viewing angle and a high contrast through the light diffusion effect without newly attaching a light diffusion sheet to the observation surface side. Type projection screen performance can be obtained.

In the method for manufacturing a transmission type projection screen, a step of arranging a plurality of lenses on a light transmissive sheet to form a screen is provided.
Disposing a positive-type photosensitive adhesive layer containing a diffusing agent, exposing the positive-type photosensitive adhesive layer containing a diffusing agent with a light source projected from a surface opposite to the observation surface of the screen; A step of spraying a light-shielding toner on the surface side, and a step of removing toner other than the one adhered to the adhesive containing the diffusing agent from the surface on the observation surface side.

By this means, by adding a light diffusing agent to the positive photosensitive adhesive layer on the observation surface side of the transmissive projection screen having a plurality of lenses, a light diffusion sheet is newly provided on the observation surface side. The number of bonding steps can be reduced.

[0010]

Embodiments of the present invention will be described below in detail with reference to FIG. FIG. 1 is an explanatory diagram for describing an embodiment of the present invention. In FIG. 1, a transmissive projection screen 11 before a light-shielding pattern is formed has a lens 1 having a semi-cylindrical or micro-lens shape on at least one surface as shown in FIG.
Form 2 First, as shown in (b), the positive photosensitive adhesive layer 1 is placed on the flat portion 13 on the observation surface side of the screen 11.
Positive photosensitive adhesive layer 1 of positive photosensitive film 14 formed by laminating 4a and mylar film 14b
4a is attached.

A specific product name of the positive photosensitive film 14 is Chromalin film (trade name of DUPONT)
It has been known. The positive photosensitive film 14 is obtained by newly adding a diffusing agent.

Before the positive photosensitive film 14 is adhered to the flat portion 13, the positive photosensitive adhesive layer 14a is exposed to a mylar film 14b in order to prevent the positive photosensitive adhesive layer 14a from being exposed as shown in FIG. The propylene sheet 14c is stuck on the opposite surface where the is stuck. Therefore, the plane part 1
3 is attached after peeling off the propylene sheet 14c.

Positive photosensitive film 14 and screen 1
It is important that 1 is sufficiently adhered, and a method of compressing under heating is used. The positive photosensitive adhesive layer 14a containing a diffusing agent used for the positive photosensitive film 14 is also used.
Has an acrylic resin as a main component and is of a radical reaction type, so that it is hindered by oxygen in the atmosphere. For this reason, it is impossible to leave the propylene sheet 14c in the air with the propylene sheet 14c peeled off. In actual use, it is convenient to use a laminator dedicated to chrominary film.

The screen 11 thus formed
A light beam is irradiated from the opposite surface of the screen 11 on which the positive photosensitive film 14 is stuck, and the condensing part of each lens 12 of the screen 11 causes the positive photosensitive adhesive layer 14a containing a diffusing agent to be irradiated. Expose. The hatching in FIG. 1 (c) indicates the exposed portion 15 where the positive photosensitive adhesive layer 14a has been exposed to light. The adhesiveness of the positive photosensitive adhesive layer 14a containing a diffusing agent at the exposed portion 15 is lost.

When the exposure section 15 is formed, it is important to provide a light-collecting section at the same position as when the screen is actually used, and to expose the light at the same position as the projection light source or at an optically equivalent position. Needs to be provided. The exposure light source may be any one containing a large amount of ultraviolet light near 365 nm, and among them, a near ultraviolet mercury lamp is preferable.
Usually, exposure for about 10 seconds to 2 minutes is sufficient.

After the exposure of the screen is completed, the Mylar film 14 is removed from the positive photosensitive adhesive layer 14a containing the diffusing agent.
b is peeled off to expose the positive photosensitive adhesive layer 14a containing the diffusing agent. As shown in FIG. 1D, a light-shielding toner 16 is sprayed on the positive photosensitive adhesive layer 14a containing a diffusing agent other than the exposed portion 15 where the adhesiveness has been lost. The light-shielding toner 16 has various color tones. Here, it is sufficient that the light-shielding toner 16 has a light-shielding property, and the standard color black is sufficient. Light shielding toner 16
Is applied, the light-shielding toner 16 is sufficiently adhered to the surface of the positive photosensitive adhesive layer 14a containing a diffusing agent with a pad, and then the surface of the positive photosensitive adhesive layer 14a containing a diffusing agent is wiped off. The light-shielding toner 16 and excess toner 15 attached thereto are removed.

Although the desired transmissive projection screen can be obtained by the above-described steps, the light-shielding toner 16 may fall off from the positive photosensitive adhesive layer 14a containing the diffusing agent, or the light-shielding toner 16 containing the diffusing agent in the exposed portion 15 In order to prevent contamination of the photosensitive adhesive layer 14a, a protective film on the observation surface side of the screen 11 may be provided. As the material, a protective film may be formed by laminating a clear lacquer or a cover film 31 as shown in FIG. 3 on the light-shielding toner 16 and exposing and curing the entire surface.

As described above, by adding a diffusing agent to the positive photosensitive pressure-sensitive adhesive layer in advance, it is possible to obtain a transmissive projection screen having a wide viewing angle and a high contrast by a light diffusion effect.

Further, since the exposure of the positive photosensitive pressure-sensitive adhesive layer 14a containing the diffusing agent is performed prior to the attachment of the light-shielding toner 16, a sufficient effect can be obtained even by short-time exposure without being hindered by the exposure. Can be given. Further, the color tone and density of the light-shielding toner can be freely selected regardless of the exposure conditions, and an excellent light-shielding pattern can be easily obtained. Since there is no wet process, by providing a desired light-shielding pattern simply and easily, it is possible to obtain a transmissive projection screen with high light efficiency and high contrast.

[0020]

As described above, according to the present invention, since the diffusing agent is added to the positive-type photosensitive pressure-sensitive adhesive layer in advance, daylight or indoor lighting can be performed without increasing the number of new members and the step of attaching the same. Even in the presence of illumination light or the like, it is possible to prevent a decrease in contrast due to external light incident on the observation surface side of the transmission type projection screen, and obtain a good projected image.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for describing an embodiment of a process of manufacturing a transmission type projection screen according to the present invention.

FIG. 2 is a sectional view for explaining a main part of FIG. 1;

FIG. 3 is a cross-sectional view for explaining a transmission type projection screen of the present invention manufactured by the process of FIG. 1;

[Description of Signs] 11 ... Screen, 12 ... Lens, 13 ... Planar part, 14
a: Positive photosensitive pressure-sensitive adhesive layer containing a diffusing agent, 14b: Mylar film, 15: Exposure part, 16: Light-shielding toner, 31
... cover film.

Claims (4)

[Claims] 1. A light transmissive screen on which a lens such as a lenticular lens or a micro lens is formed, a positive photosensitive adhesive layer disposed on an observation surface side of the screen, and an image projected from a surface opposite to the observation surface. An exposure unit formed on the positive photosensitive adhesive layer by the light source, and a light-shielding toner applied to the positive photosensitive adhesive layer on the observation surface side of the screen surrounding the exposure unit, A transmissive projection screen, characterized in that a diffusing agent is added to a photosensitive photosensitive adhesive. 2. The transmission type projection screen according to claim 1, wherein a cover sheet for protecting the light-shielding toner is further laminated on the upper surface of the light-shielding toner. 3. A step of forming a screen by arranging a plurality of lenses on a light-transmitting sheet; and arranging a positive photosensitive adhesive layer containing a diffusing agent on the observation surface side of the screen; Exposing the positive-type photosensitive pressure-sensitive adhesive layer containing the diffusing agent with a light source projected from the surface opposite to the observation surface of the screen; dispersing a light-shielding toner on the surface on the observation surface side; Toner other than the one that has adhered to the adhesive
Removing from the surface on the observation surface side. 4. The light source in the step of exposing the positive photosensitive pressure-sensitive adhesive layer containing a diffusing agent is a light source for projecting the screen or a light source projected from a light source having an opening equivalent thereto. The method for manufacturing a transmission type projection screen according to claim 3.