JPS59121033A - Manufacture of transmission type projection screen - Google Patents

Abstract

PURPOSE:To form easily a pattern which is excellent in its light shielding property without requiring a wet process by exposing an adhesive agent from the surface opposite to the adhesive agent surface, eliminating an adhesive property of a condensing part, and thereafter, scattering a light shielding toner from on the observing surface, and sticking it to an unexposed part. CONSTITUTION:A propyrene sheet 4 is stripped off from a chromarin film 3, and a surface 7 of a photosensitive adhesive agent 6 is stuck to an observing surface side 2 of a screen. A chromarin film 9 of a condensing part of each lens of the screen is exposed by irradiating a beam from an opposite surface 8 to a film of the film provided with this chromarin film. After the exposure is ended, a ''Mylar'' film 5 is stripped off from the adhesive agent layer 6, the adhesive agent layer is exposed, and a chromarin toner 10 is scattered on this layer. Subsequently, the toner is stuck sufficiently onto the surface of the adhesive agent layer 6 with a pad, and therefore, the surface of the adhesive agent layer is wiped with cloth, and the toner adhering to the exposed part 9 and a surplus toner are removed. That is to say, since the exposure is executed before the light shielding toner is scattered, a sufficient effect can be given by an exposure of a short time. Also, the color tone and concentration of the light shielding toner can be selected freely.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method of manufacturing a transmission type projection screen, and the present invention relates to a method for manufacturing a transmission type projection screen, which prevents external light incident on the viewing side surface of the screen even in the presence of daylight or indoor lighting. The present invention relates to a method of manufacturing a transmission type projection screen that can prevent a decrease in contrast caused by the above and obtain a good projected image.

[Technical background of the invention and its problems]

Conventionally, regarding transmissive projection screens, methods include applying anti-reflection processing or diffusion processing to the viewing side surface of the screen;
Alternatively, a method of coloring the material of the screen itself to impart appropriate light absorption properties is known as a method of preventing a decrease in contrast caused by external light and obtaining a good projected image.

However, as the area of the screen becomes larger, it becomes difficult to perform a uniform and high-quality anti-reflection treatment on the entire surface, leading to an increase in cost. Furthermore, coloring the screen itself reduces the photoacidity of the projected image, which is desirable.

For this reason, by using a transmissive projection screen made of lenses or mosaic lenses, the contrast can be improved by imparting directivity so that most of the light projected from the screen is directed toward the viewer. Although methods have been proposed to improve the contrast, no countermeasures have been taken against the external light reflected on the screen surface, and the contrast is still insufficient in the presence of daylight or indoor lighting.

Therefore, a method was devised to reduce the influence of external light reflected from the screen and improve contrast by forming a porous mask with a light absorption layer on a part of the observation side surface of this type of screen. reached. For example, in Japanese Patent Application Laid-open No. 10134/1984, after disposing a photosensitive material layer capable of reversal phenomenon or a photosensitive material layer having positive-positive characteristics on the observation side surface of the screen, the screen is provided with a photosensitive material layer having almost the same position and aperture as the projection device or the projection lens. This is a method in which a porous mask is formed by exposing the screen to light irradiated from the opposite side of the screen to the observation surface using a surface light source having a surface light source, and then developing the mask. There are relatively few types of photosensitizers having transparent positive-positive properties, and phenolic resins modified with orthoquinone diazide photosensitive resins are mainly suitable for this purpose. However, the color tone of the resin is pale yellow to brown, and in order to form a layer with sufficient light absorption as a screen characteristic, (
3) Coating the resin layer thickly, for example, 5 microns or more, will form a core wall, but in such a case, when the resin layer dries, streaks called striations will occur on the surface, which is This has an undesirable effect on the optical properties of the screen. In order to solve this problem, it is sufficient to use a photosensitizer with positive-positive characteristics that has sufficient light absorption even at a film thickness of about 5 microns or less, but as mentioned above There is no photosensitizer, and in the method of simply adding colored pigments etc. to the photosensitizer to improve light absorption, as the light absorption increases, the photosensitivity of the photosensitizer itself decreases. If this is significant, it becomes impossible to form a porous mask, which is not a preferable method.

As a means to solve this problem, for example, Japanese Patent Application Laid-Open No. 49-661
No. 35, a method of providing a photoresist pattern on a screen and providing a light-shielding ink layer on this pattern, and Japanese Patent Application Laid-Open No. 50-92729, a method of providing a transparent conductive layer and a transparent photoconductive layer on the back side of the screen in that order. There are methods such as charging the photoconductive layer and exposing it to light from the screen side (4) to form a pattern by developing an electrostatic latent image, but all of them involve a wet process in the processing process and are complicated in step 7j. It also has the disadvantage of being expensive.

[Purpose of the invention]

The present invention was made to solve the above-mentioned drawbacks, and it is possible to easily and inexpensively form a matrix (porous mask) or stripe projection screen in a transmission projection screen made of lenticular lenses or mosaic lenses without using a wet process. The present invention relates to a method of manufacturing a transmission type projection screen that makes it possible to form a light-shielding pattern.

[Summary of the invention]

In the present invention, a positive photosensitive adhesive, that is, an adhesive whose adhesiveness disappears when exposed to light, is provided on the observation surface side of a transmission projection screen made of a lenticular lens or a mosaic lens, and this adhesive surface and After exposing the adhesive to a light beam projected from a projection light source or a light source with an equivalent aperture from the opposite side to lose the adhesiveness of the condensing part of each unit lens of the lens system, from above the observation surface. This method eliminates the need for a wet process by spraying light-shielding toner and adhering it to the unexposed areas where tackiness remains, and removing the toner and excess toner that has adhered to areas that have lost their tackiness due to exposure. It is an object of the present invention to easily and inexpensively obtain a transmission type projection screen on which a pattern with excellent light shielding properties is formed.

[Embodiments of the invention]

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a process diagram showing an embodiment of the method for manufacturing a transmission type projection screen according to the present invention, in which the transmission type projection screen 1 before forming a light-shielding pattern has a semicircular shape or a fly-like pattern on at least one side. It has a lenticular lens or a mosaic lens, and the surface is subjected to diffusion treatment if necessary. First, as a first step, a positive photosensitive adhesive is provided on the viewing surface side 2 of the screen 1.

A positive photosensitive adhesive is a type of acrylic photosensitive material. To apply it to a screen, if the adhesive is in liquid form, it must be applied using a conventional coating method, such as spinner coating, dip coating, or spray coating. , roll cold force, spatula coating, etc. may be used, but a simpler and easier method is to attach a positive photosensitive adhesive that has been formed into a film shape in advance to the screen surface, and this example shows this method. .

Cromarin Film (trade name, manufactured by DUPONT) is well known as this type of film-like positive photosensitive adhesive. That is, the chromalin film 3 (l''r) has a structure in which a thin layer 6 of photosensitive adhesive is sandwiched between a polypropylene sheet 4 and a mylar film 5. First, the propylene sheet 4 is peeled off from the chromalin film 3, and the photosensitive adhesive is The surface 7 of the adhesive 6 is pasted on the observation side 2 of the screen.At this time, it is important that the adhesive layer 6 and the screen 1 are sufficiently bonded, and a method of pressure bonding to a heating knife is used. The photosensitive adhesive used in Cromarine film is mainly composed of acrylic resin and is radical-reactive, so the reaction is inhibited by oxygen in the atmosphere, so it is not recommended to leave it in the atmosphere with the propylene sheet 4 peeled off. (7) In actual use, it is convenient to use a laminator specifically designed for Cromarin film. A screen with a film is irradiated with light from the opposite side 8 of the film to expose the chromin film 9 in the condensing part of each lens of the screen. It is important to provide a light condensing section at a position, and it is necessary to provide an exposure light source at the same or optically equivalent position as the projection light source.

The light source for exposure may be any light source that contains a large amount of ultraviolet light in the vicinity of 3651 m, but a near ultraviolet mercury lamp is preferred, and exposure for about 10 seconds to 2 minutes is usually sufficient.

After the exposure of the screen is completed, the Mylar film 5 is peeled off from the adhesive layer 6 to expose the adhesive layer, and the chrominic toner 10 is sprinkled thereon.

There are various tones of toner, but in the case of this embodiment, it is sufficient that the toner has light-shielding properties, and the standard color black is sufficient.

After the toner is spread, the toner is sufficiently adhered to the surface of the adhesive layer 6 using a pad, and then the surface (8) of the adhesive layer is wiped with a cloth to remove the toner adhering to the exposed area 9 and excess toner. Although the desired transmission type projection screen can be obtained through the above steps, in order to prevent the toner from falling off the adhesive layer or contaminating the adhesive layer in the exposed area,
A protective film may be provided on the observation surface side of the screen made in this way, and the material may be clear lacquer or the like, as shown in FIG. It is also possible to use it as a protective film by exposing it to light and curing it.

A Cromarin color display positive D film was laminated on the observation surface side of a lentil screen (pitch: 1.59 mm, spherical radius: 1.02 mm, thickness: 1.2 mm) using Cromarin Lavanator Model 27. After irradiating this with a near-ultraviolet mercury lamp (output 400 W, 80 W/cm) for 25 seconds from a distance of 65 cm on the opposite side of the laminate surface, the Mylar film on the Chromalin surface was removed, and Chromalin different color toner was sprinkled on the film-removed surface, and a pad was used to remove the Mylar film. After fully adhering the toner to the adhesive surface of Cromarin,
Excess toner was removed from the surface of the screen using a rustic cloth (a cloth for wiping toner) to obtain a transmission type projection screen having a light-shielding pattern. The light-shielding portion of this screen had an excellent total transmittance (Tt) of 5 factors or less, and had an excellent nine-shielding property.

〔Effect of the invention〕

As described above, according to the present invention, since the exposure of the photosensitive adhesive layer 6 is carried out prior to the attachment of the light-shielding toner 10, there is no interference from this (and even a short exposure can provide a sufficient effect). In addition, because the color tone and density of the light-shielding toner can be freely selected regardless of the exposure conditions, excellent light-shielding patterns can be easily obtained, and there is no need for development processing such as liquid immersion when washing with water. A transmission type projection screen having a desired light-shielding pattern can be obtained simply and easily without a so-called wet process.

[Brief explanation of the drawing]

FIG. 1 is a process diagram showing an embodiment of the method for manufacturing a transmission type projection screen according to the present invention, and FIG. 2 is a specific example of a transmission type projection screen obtained by the process diagram of FIG. 1. FIG. DESCRIPTION OF SYMBOLS 1... Screen, 2... Observation surface side, 3... Chromalin film, 4... Polypropylene sheet, 5...
... Mylar film, 6... Photosensitive adhesive layer, 11
...Chromalin film. Representative Patent Attorney Kensuke Chika (and 1 other person) (11) Figure 1 Figure 2

Claims (1)

[Claims] A step of disposing a positive photosensitive adhesive on the observation surface side of a transmission projection screen made of a lenticular lens or a mosaic lens, and a projection light source or an equivalent aperture from the opposite surface of the screen to the observation surface. The method is characterized by comprising the steps of: exposing the adhesive to light beams projected from a light source, scattering light-shielding toner on the viewing surface, and removing toner other than that adhered to the adhesive from the surface. A method of manufacturing a transmission type projection screen.