JPS59155835A - Manufacture of transmission type projection screen - Google Patents

Abstract

PURPOSE:To obtain a high contrast picture by coating an applying agent obtained by mixing a binder, a colored pigment and a positive type photosensitive resin, to an observation surface side of a screen, and thereafter, executing a specified exposure from the surface opposite to the observation surface, executing a development, and preventing a reflection of external light. CONSTITUTION:When manufacturing a transmission type projection screen 1, for instance, on the observation surface of a screen 3 on which a semicylindrical lens is arrayed in parallel, a mask layer 4 obtained by adding a binder resin to a colored pigment (for instance, ''Spirit Black'') and a photosensitive resin if necessary is formed. Subsequently, a screen 2 on which a semi-cylindrical lens is arrayed in parallel is fixed to the screen 3 as one body by using an adhesive, etc. Next, an exposing light source is provided on a position 5 which is optically equivalent to a position of an actual projecting machine, and it is irradiated as a luminous flux shown by prescribed light 6a, 6b, 6c and 6d. Thereafter, the layer 4 of the exposing part is dissolved and removed by a developer. In this way, a high contrast picture whose whole surface has a uniform external light absorbing performance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a transmission projection screen, which prevents reflection of external light on the screen surface even in broad daylight or in the presence of indoor light; The present invention relates to a method of manufacturing a transmission projection screen for obtaining high contrast images.

[Technical background of the invention and its problems]

Transmission imaging devices are generally used for observation in bright rooms.
Ambient external light, such as indoor lighting light, is reflected on the screen surface, increasing the brightness of the dark areas of the image projected on the screen and reducing the contrast.

The problem is that high-quality images cannot be obtained. Conventionally, various methods have been tried for transmissive projection screens to provide a light-absorbing layer on the screen surface in order to prevent a decrease in image contrast due to the reflection of external light on the screen surface, as described above. For example, the following methods have been proposed as methods using . In JP-A No. 49-66135, after applying a titanium organic compound solution, a photoresist film is provided on the film, and striped 7 (turns) are formed on the surface other than the light transmitting part, and at the same time, the titanium organic compound film is coated. After the photoresist pattern has been diffused and water-retained, oil-based ink is applied only to the photoresist pattern to form a light-shielding ink film.

Furthermore, in JP-A No. 49-16432, a photosensitive material is coated on the entire surface of the screen and then exposed, the photosensitive material is removed leaving the exposed area, and then a black pigment is applied on the entire surface, and then the exposed portion of the photosensitive material and the photosensitive material are A method is described for obtaining a light-absorbing mask by carrying out a method called list-off, in which the black pigment applied on the material is simultaneously removed.

However, these methods require many coating steps and are complicated, which inevitably increases costs.

Furthermore, in JP-A-50-10134, there is also a method in which a photoresist layer is provided on the screen surface and developed so that the unexposed areas, i.e., the areas other than the light transmitting areas, are blackened or residually hardened. Proposed. However, according to this method, it is difficult to perform development processing on a large screen so that the degree of blackening is uniform over the entire screen.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and is a transmissive projection system having a light absorption film that prevents ambient light from being reflected on the screen surface and blocks stray light from the projector. An object of the present invention is to provide a simple method for manufacturing a transmission type projection screen in which a light absorption mask having uniform external light absorption performance is formed over the entire surface of the screen except for the part from which light is emitted.

[Summary of the invention]

When colored pigments are mixed into photosensitive resin, it is possible to form a black film that absorbs external light.
In order to provide a sufficient amount of exposure, problems arise in that an exposure light source with higher output than necessary is required and the exposure time is unnecessarily long.

However, as an external light absorbing film, the reflectance is low enough to block the light leaking from the projector, and during exposure, it does not block the light in the maximum sensitivity wavelength range of the photosensitive resin too much. The above-mentioned problems can be solved by using a coating agent that is a mixture of various colored dyes and a photosensitive resin, and by finding the optimum mixing ratio.

A coating agent made by mixing a colored dye and a photosensitive resin is mixed and adjusted in advance so that the transmittance of the coating agent application screen in the maximum sensitivity wavelength region of the photosensitive resin is 10 to 20%, and a transmission type is prepared. After forming a film of the coating agent on the observation side surface of the projection screen, exposure is performed from the opposite side to the observation side by arranging an exposure light source in an optical arrangement equivalent to a projector in a projection device. By developing and removing only the portions of the coating that were exposed to the light from the projection light source, external light can be absorbed without interfering with the emission of light to the observation surface side of the transmissive screen. This is a method of manufacturing a transmissive projection screen that forms a light-absorbing mask.

That is, for a transmission type projection screen such as 1 shown in FIG.
The transmittance of the coating agent application screen is 10-'-20% in the maximum sensitivity wavelength region of the photosensitive resin, and the reflectance of the coating agent is 400 to 600% in the visible region.
In order to coat only one side with the coating agent, which is approximately 10 cm in nm, a mask layer (for example, mold release silicone, etc.) is formed on the back side of the observation surface of the screen 3, and then sprayed. A coating layer 4 made of a colored dye and a photosensitive resin is formed on the viewing surface by a method or a DIP method. After the coating is completed, the mask layer is dried and the mask layer is removed, and the screen 3 and the screen 2 are fixed together with an adhesive or other method to form a screen.

Next, an exposure light source is set on the screen 1 at a position 5 optically equivalent to the actual position of the projector, and exposure is performed. According to this method, the exposure pattern of the coating layer 4 of the screen turf soil will not be disturbed due to the deviation of the screen, and it is possible to avoid a situation where the light beam from the projector is blocked when put into practical use. can. Here, Fig. 1 6 (a
), 6(b), 6(c).

6(d) shows the light rays from the light source, and the light rays are condensed by the screen turf and expose the coating layer 4 on the viewing surface of the screen 3.

After that, the integrated screen 1 is subjected to a development process, and after completion of the development process, the exposed part of the coating layer is removed by thoroughly rinsing with water. It is possible to form a coating layer that has light absorption properties and can block light leaking from the projector side. All of the above steps should be done in the dark or under safe light.

〔Effect of the invention〕

Therefore, according to the present invention, a photosensitive resin coating made by mixing a colored dye with a photosensitive resin is formed in advance on the observation surface side of a transmission type screen, and after exposure, only the exposed portion of the photosensitive coating is exposed. Since it is only necessary to remove it, it is possible to form a light absorption mask that does not obstruct the emission of light from the observation surface side of the transmission screen and has uniform external light absorption performance over the entire surface. Ru. Therefore, after exposure, there is a step of removing only the exposed six parts of the photosensitive film and printing on it, or after performing the above removal process, a liquid made by mixing a colored pigment such as carbon and a binder, etc. Since there is no need for a coating process or a process for developing color by post-exposure development treatment, a simple and inexpensive manufacturing process can be realized.

In addition, in the present invention, the photosensitive film in the exposed areas is removed by combining with appropriate development conditions, and at this time, the colored pigments present in the exposed areas can also be completely removed without leaving any residue. It is.

Furthermore, the degree of color of the colored pigment is sufficient to fulfill the original purpose of preventing reflection of external light and improving the contrast of the screen.

As described above, in the method for manufacturing a transmission projection screen of the present invention, a coating agent made by mixing an appropriate amount of colored pigment with a photosensitive resin is applied to the viewing surface side of the screen to form a photosensitive film. After being exposed to light by an exposure light source installed at a position optically equivalent to the projection light source at a position opposite to the observation surface side, part of the photosensitive coating containing the colored dye is exposed to light from the exposure light source. Since it is only necessary to perform a process of removing only a portion, a uniform light absorption mask can be obtained over the entire surface of the screen without interfering with the light emitted from the screen, which simplifies the screen manufacturing process. And cost reduction can be achieved.

[Embodiments of the invention]

The back side of the observation surface of the glass screen, which has a large number of semi-cylindrical lenses arranged in parallel, is masked with release silicone TSE 3561RTV.Then, a colored film having a spectral transmittance as shown in Figure 2B is used. 3.3 parts of a dye (manufactured by Respé Chemical, Spirit Black), 100 parts of a photosensitive resin (low quinonediazide-based novolak type, positive resist, TR8-1), and further 66.7 parts of methyl heptarosol as a diluting solvent. The mixture is applied as a coating agent to the screen provided with the single-sided mask by the D=p method. After drying, the silicone of the masking agent was removed, and a screen 3 coated on one side was manufactured, and the screen 3 was bonded and fixed to the other screen 2 to form a single unit to prevent optical misalignment. Afterwards, the integrated screen 1 is installed at an exposure position, and exposure is performed from a position optically equivalent to that of a projector using a light source for exposure. Exposure was carried out using a mercury lamp at a light intensity of 5.5.
mw/ctft for approximately 80 seconds. Thereafter, the coating layer in the exposed area is removed by developing with an alkaline developer for about 160 seconds. At this time, by performing a development process, the colored pigments present in the exposed areas can be completely removed without remaining together with the photosensitive resin in the exposed areas, and the degree of blackening in the unexposed areas is still sufficient to fulfill the original purpose. The degree of blackening is obtained.

FIG. 2 shows the external light transmittance of the photosensitive resin-coated screen containing the colored dye in this example before the development process, and FIG. 3 shows the reflectance of the photosensitive resin-coated screen. The reflectance can be reduced by about half compared to the reflectance.

A pattern with good light absorption properties was obtained.

[Comparative Example 1] When twice the amount of the above spirit blank was mixed (Samples 4 to 7), the exposure amount was 220 m J /ctll to 20
Despite the variation over the range of 00 mJ/cyst, a clear photoresist pattern could not be obtained even after development.

[Comparative Example 2] When 1/2 the amount of spirit black was mixed in (Samples 8 and 9), a clear image pattern could be obtained by exposure and development. However, when observing an actual image using this screen, sufficient contrast and trust of the image could not be obtained. That is, the degree of blackening was insufficient.

In Figure 2, A is the maximum photosensitive area of the O-nandoquinodiazide photosensitive resin, B is the spirit black-ethanol solution, and C is a plate coated with a mixed solution of spirit black and photosensitive resin (the substrate is a screen IJ-lens). , D is the light transmittance curve of only the substrate screen lens, and FIG.
F indicates the spectral reflectance of the untreated screen, and E indicates the spectral reflectance of the untreated screen.

As an example of a margin screen, a screen in which semi-cylindrical lenses are arranged in parallel is shown below, but the present invention is a fly-eye lens screen, and a so-called multiple lens element in which cylindrical lenses are arranged in parallel. It can also be applied to screens made of acrylic and polycarbonate, which have high light transmittance in the maximum sensitivity wavelength range of photosensitive resins.

The present invention is also applicable to glass and the like.

Furthermore, within the scope of the present invention, it is possible to obtain an optimal screen according to external conditions by varying the amount of mixed colored dye, and this is a useful method for manufacturing high-performance screens.

[Brief explanation of drawings]

FIG. 1 is an overall view showing the screen and light source according to the present invention, FIG. 2 is a characteristic diagram showing light transmittance curves under various conditions, and FIG. 3 is a characteristic diagram showing spectral reflectance curves. (1); (Screen that integrates 21 and (3); (2); (3); Screen that has semi-cylindrical lenses arranged in parallel; (4); Coating layer made of photosensitive resin and colored pigment. , (5); Exposure light source or projector, Agent Patent attorney Kensuke Chika (and 1 other person)

Claims (2)

[Claims] (1) In the method for manufacturing a transmission projection screen, a step of forming a photosensitive film on the viewing surface side of the screen using a coating agent made by mixing a binder, a colored dye, and a positive photosensitive resin in advance; , after exposing the photosensitive coating with an exposure light source placed at a position equivalent to the projection light source from the opposite side of the viewing surface of the screen, only the exposed portion of the photosensitive coating is removed; A method for manufacturing a transmission projection screen, comprising a developing treatment step. (2) The transmittance of the coated layer formed by mixing the binder, colored dye, and positive photosensitive resin is 20 to 20.
A method for manufacturing a transmission type projection screen according to claim 1, characterized in that the particle size is in the range of 30q6.