JPS60138525A - Manufacture of transmission type projection screen - Google Patents

Abstract

PURPOSE:To easily obtain a transmission type projection screen which has a colored film superior in aperture precision by forming a photosensitive resin film uniformly on the observation surfaces of a screen body consisting fine convex lens surfaces, and exposing the film and then performing coloring processing and development. CONSTITUTION:The photosensitive resin film 10 is stacked on the observation surface of the transmission type projection screen body 7 which has fine convex lens surfaces 6a and 6b on the projection surface and observation surfaces, and the air pressure in the space formed between the photosensitive resin film 10 and screen body 7 is held lower than the external pressure to bring the photosensitive resin film 10 into contact with the observation surface. Then, light is emitted from the projection surface side of the screen body 7 to expose the photosensitive resin film 10 of a light transmission part. Then, the photosensitive resin film 10 is colored except at the exposed part by using coloring particulates and the exposed part of the photosensitive resin film 10 is removed from the observation surface by using a developer to obtain the transmission type projection screen having the desired colored film.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for manufacturing a transmissive projection screen capable of reducing reflected light on the screen surface and increasing contrast.

[Technical background of the invention and its problems]

The so-called GLOSSIX TV, which has a larger display screen, is mostly used for observation in bright rooms, and it is an important issue to prevent the contrast of the displayed image from decreasing due to ambient external light. It has become. By the way, as shown in FIG. 1, for example, a transmissive projection screen used in a transmissive globulary television has a Fresnel lens 2 formed on the projection surface side of a light-diffusing substrate 1, and a lenticular lens on the observation surface side. 3 are integrally formed. As shown in FIG. 2, images from projection tubes 4R, 4G, and 4B for red, evening, and line corresponding to the three primary colors of light are received by the two Fresnel lenses through projection lenses 5R, 5G, and 5B. , these are diffused and combined and emitted from three surfaces of the lenticular lens.

However, devices using such a screen have a problem in that the brightness and color balance of the image observed on the screen (lenticular lens 3) vary drastically depending on the direction in which the screen is viewed. there were.

To solve this problem, a transmission type projection screen 7 has been developed, for example, as shown in FIG. There is. According to the screen 7 having such a structure, it is possible to eliminate changes in brightness and color balance due to different viewing directions without using the Fresnel lens 2 described above. Moreover, as its cross-sectional structure is schematically shown in FIG. After the light is focused on a minute portion of the convex lens surface 6b,
Since it is diffused toward the viewing surface, it is possible to form a colored (blackened) film 8 in the area excluding the minute portions, thereby achieving effects such as preventing the reflection of external light, and ultimately improving the contrast. It becomes possible to aim for improvement.

By the way, the projection tube 4 in this type of screen 7
The incident angle of the image lights from R, 4G, and 4B changes depending on the position on the screen 7, and therefore the condensing position on the convex lens surface 6b also changes. For example, as illustrated in FIG. 5(,), in the center of the screen, light gathers at the center of the convex lens surface 6b and is diffused from there, whereas in the periphery of the screen, light ), light gathers at a position shifted from the center of the convex lens surface 6b and is diffused from there. The amount of deviation of the convex lens surface 6b of the light condensing/diffusing section from the center changes continuously from the center of the screen 7 to its periphery. For this reason, it was necessary to change the formation position of the colored film 8 according to the position on the screen 7.

Therefore, conventionally, for example, as shown in FIG.
The part not used for the diffusion of the image is made into a flat surface 9 protruding from the convex lens surface 6b, and a colored film 8 is coated on this flat surface 9 by a printing method, or as shown in FIG. A colored film 8 is coated on the entire surface of the convex lens surface 6b by the Sugeley method or the Ditsuno method, and this is butter-printed to form a window in the area where the image is to be diffused.

However, when the structure shown in FIG. 6 is adopted, the flat surface 9
It is extremely difficult to determine the formation position with high precision. Moreover, the position at which the colored film 8 should be provided changes depending on the device specifications, and there is a problem in that it is almost impossible to deal with this. Furthermore, as shown in FIG. 7, it is extremely difficult to uniformly form colored pigments or colored dyes on the convex lens surface 6b, and due to non-uniformity of the thickness, etc. There is a problem in that it is difficult to obtain with high accuracy 7'C. So, in the past, in order to increase the contrast of the screen 7, how to form a colored film (anti-reflection film) with high precision and easily. The biggest issue was how to set it up.

[Purpose of the invention]

The present invention has been made in consideration of these circumstances, and its purpose is to easily form a colored film with high aperture accuracy on the observation surface formed by the micro-convex lens surface of the screen body. The object of the present invention is to provide a method for manufacturing a transmission type projection screen whose contrast ratio can be increased.

[Summary of the invention]

In the present invention, a photosensitive resin film is superimposed on the viewing surface of a screen body in which the projection surface and the viewing surface are formed by an assembly of micro-convex lens surfaces, and the space between the photosensitive resin film and the viewing surface is The resin film is brought into close contact with the observation surface by lowering the pressure than the outside of the resin film, and then irradiation is applied from a predetermined position on the projection surface side to expose the resin film in the light-condensing and diffusing portion of the observation surface. However, by carrying out a development process, a colored film is formed only in areas other than the exposed light-condensing and diffusing areas.

〔Effect of the invention〕

Thus, according to the present invention, the photosensitive resin film is uniformly brought into close contact with the viewing surface of the entire screen using a pressure difference, and then exposed to light from the projection side of the screen. It is possible to expose with high precision only for Therefore, the formation of a colored film through the subsequent development process can be carried out with high precision by controlling the size of the exposed area9, making it possible to easily obtain a transmission type projection screen with high contrast. .

[Embodiments of the invention]

Hereinafter, a manufacturing method according to an embodiment of the present invention will be explained with reference to the drawings.

First, as shown in FIG. 3, a screen body made of two metals is prepared, with minute convex lens surfaces 6a and 6bf formed on the projection surface and observation surface. The screen body 7 is made of an optical medium made of a transparent resin such as acrylic, vinyl chloride, polycarbonate, or polystyrene, or a colorless transparent material such as transparent glass, and is made of an optical medium made of a transparent resin such as acrylic, vinyl chloride, polycarbonate, or polystyrene, or a colorless transparent material such as transparent glass.
, 6b, the convex lens surface 6b facing thereto,
It is set to approximately match 6m. The focal position of the convex lens surface 6a of the tab is on the convex lens surface 6b, and on the observation surface side of the screen body 7, as shown in FIG. 8 or 9,
A solid or semi-solid photosensitive resin film 10 is closely formed by a vacuum lamination method or a pressure lamination method. This photosensitive resin film 10 is shown in FIG.
), a three-layer resin coating in which a photosensitive resin layer 10c is provided between the supports H10th and lσb, or a two-layer structure in which the photosensitive resin layer 10c is supported and formed on one surface of the support film 10a. For example, it is made of a so-called dry film formed by extrusion by heating a photosensitive resin to a softening temperature. This photosensitive resin film 10
The details will be described later.

The photosensitive resin film 10 is formed in close contact with the screen body 7 by the vacuum lamination method, as shown in FIG. A film-like photosensitive resin film 10 having a thickness of about 10 to 100 μm is provided to cover the upper edges of the screen body 7 and the frame body 11. Afterwards, the 8th
As shown in Figure (b), the inside of the frame 11 housing the screen body 7 is evacuated using a vacuum pump or the like, and the photosensitive resin film 10 and the viewing surface of the screen body 7 are separated from each other. The pressure in the space between them is reduced to bring the resin film 10 into close contact with the observation surface. At this time, in order to make the resin film 10 completely adhere to the concave portion of the observation surface where a large number of the convex lens surfaces 6b are formed, warm air is blown onto the resin film 10 from the upper surface as necessary. , it is preferable to soften the resin film 10. In particular, when the resin film 10 is solid rather than semi-solid, it is preferable to blow hot air as described above in order to increase the adhesion between the resin film 10 and the observation surface. In this case, Fig. 9(a)
As shown in (b), a lid 12 is provided on the upper part of the frame 11, sandwiching the resin film 10t, and pressurized air is fed into the lid 12 from a compressor or the like to remove the resin film is brought into close contact with the viewing surface of the screen body 7. At this time, by using hot air as the pressurized air and setting the pressure to 1 atm or more, the same effect as in the case of the vacuum lamination method described above can be achieved. According to this method, the conventional Unlike the spray method or dip method, the photosensitive surface of the screen body 7 is
It becomes possible to closely form a photosensitive resin film of 1° of uniform thickness without so-called sagging or shifting of the photosensitive resin.

Thereafter, the screen body 2 with the photosensitive resin film 10 closely formed on the viewing surface as described above is set in an exposure device, and the photosensitive resin film 10 is exposed. This photosensitive resin film 1
For exposure 0, as shown in FIG. 2, an exposure light source is provided at the position where the projection tubes JR, 4G, and 4B are installed, and the light from this light source is directed to the screen according to the specifications of the device on which the image is projected. This is done by irradiating the projection surface side of the main body 7. This light source emits radiation or ultraviolet rays effective for curing the photosensitive resin film 10, and emits a necessary amount of light to expose the resin film 10. In the screen main body 2, the light is condensed according to its position on the screen and is diffused through the convex lens surface 6b, so that the photosensitive resin film 10 only covers the projection light passing area of the convex lens surface 6b. It will be exposed. In other words, at the center of the screen, the center of the convex lens surface 6b as shown in FIG. 5(a) K, and at the periphery of the screen, as shown in FIG. The positions shifted from the center of the convex lens surface 6b are exposed, and the first
As shown in Figure 1 (,), the exposed portion of the photosensitive resin film 1° is cured.

Thereafter, the screen body 7 that has undergone the exposure process is immersed in a predetermined developer solution to form the photosensitive resin film 1.
After 0f development, the portion other than the exposed portion is removed as shown in FIG. 11(b). Through this development process, the resin film 1° remaining on the observation surface is used to apply a light-shielding film 8 to areas other than the remaining portion of the resin film 1o, for example, using a lift-off method.
t-form.

The light-shielding film (light-shielding film) 8 is made of, for example, a metal, a metal compound, or graphite.
The screen body 2 on which the exposed and developed resin film 10 remains by sputtering method, electroless Menna method, etc.
It is formed with a uniform thickness over the entire observation surface as shown in FIG. 11(c). Thereafter, the screen body 7 having the light-shielding film 8 formed over its entire surface in this manner is immersed again in a developer to perform development by the lift-off method. Development by this lift-off method consists of removing the resin film 10 via the light-shielding film 8, and by this development,
A uniform layer is formed on the resin film lo, remaining on the screen surface of the exposure area with the next resin film 1o, and the 7IC light shielding film 1o is removed, and a uniform resin film 10 is formed to cover the area where no resin film 10 remains. Only the thick light-shielding film 1o is shown in Figure 11 (
It will remain as shown in d).

The light-shielding film 10 formed on the observation surface of the screen body 7 in this way becomes a transmission type projection screen that has openings for dispersing the image depending on the position on the screen, and prevents a decrease in contrast. will be obtained.

The above is the basic configuration of the manufacturing method according to the present invention.

Next, the photosensitive resin film 10 will be explained in more detail. ``As the photosensitive resin film 10 that is closely formed on the screen body 7 and subjected to exposure and development as described above, it is thought that it is easy to use an ultraviolet curing type. In addition, even this kind of ultraviolet curable type is classified into an alkaline developed type and a controlled solvent developed type depending on the development form, but the selection depends on the material for forming the screen body 2. It is necessary to make a decision after determining whether the screen main body 7 will be melted or deteriorated by the developer. By the way, if the screen body 7 is made of plastic or plastic, special care must be taken since it may dissolve or devitrify depending on the developing solvent. Therefore, it goes without saying that it is necessary to select the type of the photosensitive resin film 1o so as not to cause problems in these developing steps.

Now, a photosensitive resin composition is made by dissolving a resin that is solid at room temperature with a polyfunctional (meth)acrylate manomer or a (meth)acrylic acid-modified oligomer, and then adding a photopolymerization initiator and necessary ingredients to the photosensitive resin composition. Accordingly, a photopolymerization accelerator, stabilizer, etc. are added, and the composition is formulated so that it softens at 40 to 70°C and becomes a solid or semisolid composition at room temperature.

Examples of solid resins that can be dissolved in the polyfunctional (meth)acrylate include styrene-maleic anhydride copolymer, partial alcohol/l/esterified product of the same copolymer, poly(meth)acrylic acid, maleated petroleum resin, shellac, and ethyl hydroxy. Alkali-soluble type such as ethyl cellulose
When IW't is used, the photosensitive resin composition obtained by the above-mentioned formulation becomes an alkali-developable one.

In addition, when polymethyl (meth)acrylate, polystyrene, polydiacrylphthalate, ketone resin, salt-vinyl acetate compound-penzoguanamide resin, etc. are used as the solid resin, the photosensitive resin composition obtained by the above formulation is a solvent-developed type.

In this case, as a photopolymerization initiator, benzoin ethyl ether, noethoxyamotophenone, benzyl methyl ketal S2-chlorothiozanthone, benzophenone, methylortopensoyl benzoic acid, etc. can be used individually or in combination of two or more. can be used. Furthermore, it is also possible to use dimethylethanolamine and amine derivatives containing ethyl N-dimethylaminobenzoate in combination, if necessary.

The thus obtained solid or semi-solid photosensitive resin composition is heated to its softening temperature, and is heated to a thickness of 10 to 100 mm.
The resin film 10 is obtained by extrusion molding, for example, as a μm film-like molded product. In addition, when forming this into a dry film, as shown in FIGS. 10(a) and 10(b), a support film 10a is used as a base.

Attach to 10b. That is, when forming into a dry film, the above-mentioned solid -! or a semi-solid photosensitive resin composition is dissolved in a highly volatile solvent such as methyl ethyl ketone, methyl isobutyl ketone, tohiroene, ethyl acetate ethanol, etc. alone or in a mixture, and this is dissolved in a plastic film (supporting film) 10 & After coating on top, the above solvent is volatilized. The plastic film used here is a polyester film with little expansion and contraction (
(thickness: 25 μm) or the like is used. Then, the photosensitive resin composition dissolved using the above solvent is coated with a roll coater.
, Curtain Flow Coat II ++, f Iso coater, Rot coater, etc., are used to coat the above-mentioned plastic film to a desired thickness, and then the solvent is volatilized. In the case of forming a three-layer structure as shown in FIG. 10(a), another glass film may be laminated onto the photosensitive resin composition coated on the glass film.

After that, when using such a dry film to form a resin film 10't-adherently on the observation surface of the screen body 7, in the case of the above-mentioned three-layer structure, one of the glass films is peeled off and the resin film is The film layer JOc is attached to the frame 11 so as to face the screen body 7, as shown in FIG. 8(,) or FIG. 9(a). Then, as described above, the dry film is brought into close contact with the surface of the gold screen main body 7 by vacuum or pressure lamination. Thereafter, the glass film (support film zOa) e is peeled off while the vacuum pump is in operation, so that only the photosensitive resin film 10e remains in close contact with the screen body 7. In addition, if the plastic film is peeled off while operating the vacuum pump in this way, the photosensitive resin film 1
Wrinkles are less likely to form at 0c, allowing for good lamination with good adhesion.

After that, such a photosensitive resin film 10 is irradiated with ultraviolet light from the projection surface side of the screen main body 70, and after exposing the light-transmitting part, the photosensitive resin film 10'ff is
develop.

In the case of alkaline development type, this development process requires 1 soda,
A 1-3% aqueous solution of sodium bicarbonate, potassium carbonate, etc. is used as a developer, and development is carried out for about 1-3 minutes. In the case of a solvent development type, -1,1,1) lichlorothane or the like is used as a developer. Thereafter, as described above, by forming the light-shielding film 8 using the lift-off method, a high-contrast screen comprising a light-shielding film with desired openings formed with high precision is produced. will be done.

By the way, although it is also possible to form the light-shielding film 8 using the lift-off method in this way, the above-mentioned exposure
A photosensitive resin composition that loses its tackiness is used as the resin film 10, and colored fine powder is applied thereto to form a light-shielding coating 8.
It is also possible to form

That is, when 10 tons of such a resin film is used, after the exposure treatment, light-shielding colored fine powder is uniformly sprinkled on the resin film 10, and then the resin film layer is coated using a soft cloth or brush. Let it adhere to.

By this treatment, the above-mentioned fine powder adheres well to the unexposed areas where tackiness remains, and the above-mentioned fine powder does not adhere to, or hardly adheres to, the areas that have been hardened by exposure. It disappears. At this time, if a photosensitive resin composition that does not exhibit tackiness at the working temperature is used, the tackiness of the photosensitive resin composition is reduced by heating the photosensitive resin composition at the same time as the process of attaching the colored fine powder. It's fine to give it. Thereafter, by exposing the entire surface to light and curing it, it becomes possible to further increase the adhesion strength of the colored fine powder attached to the resin layer.

Thereafter, by brushing off the colored fine powder in the unfixed portion using a soft pusher or the like, it becomes possible to form the light-shielding film 8f in which highly precise openings are formed in the light-transmitting portion.

Incidentally, as the light-shielding colored fine powder, one that is close to black is well suited for the purpose. Examples of such materials include cadden black, graphite, metal powders such as iron powder, nickel oxide powder, iron oxide powder, copper sulfide powder, powders of metal compounds, and other point-treated fine powders. Can be used. Further, the exposure for fixing such black fine powder to the photosensitive resin film 10 is carried out from the projection surface side of the screen body 7, for example, by bringing a light source close to it and moving it to cover the entire surface. If it is carried out evenly, it becomes possible to carry out effectively without being affected by the light-shielding shadow 11' caused by the colored fine powder.

By the way, in the case of using a photosensitive resin composition that does not exhibit tackiness at a working temperature of 20 to 40°C, the photosensitive resin film 10 may be coated with a screen in addition to the above-mentioned process for adhering the colored fine powder. When bringing it into close contact with the main body 7, it is necessary to heat it as described above to improve the adhesion. In this case, even if the temperature is below the temperature at which thermal deformation of the screen body 7 occurs, it goes without saying that the temperature must not be so high that the photosensitive resin itself will undergo thermal polymerization. Furthermore, the use of photosensitive resins whose tackiness temperature is extremely high is undesirable because they tend to crack at room temperature and are brittle.

Therefore, for these reasons, the photosensitive resin composition has shape stability and support film 10a.

Considering the releasability from iob, etc., there is also a problem with being too soft, so practically it is less than 100°C, preferably 60°C.
It is preferable to use a material that exhibits tackiness and is hard enough not to flow at room temperature in summer.

Now, as photosensitive resin compositions that meet these specifications, there are two types: a radical polymerization type and a cationic polymerization type.

The radical polymerizable type includes a resin having a radically polymerizable group that is solid or semi-solid at room temperature, a radically polymerizable upper layer 1 or oligomer that is liquid at room temperature, a photopolymerization initiator,
It can be formed by mixing the promoter. Here, when the above-mentioned resin exhibits radical polymerizability and the mixture exhibits tackiness at room temperature or below 100° C., the above-mentioned monomer (ogolimer) may be omitted. At this time,
As the resin having a radically polymerizable group, acrylic, methacrylic acid [(meth)acrylic acid] modified polycoster resin, (meth)acrylic acid modified urethane resin, etc. are used.

In addition, when the above resin does not have a radically polymerizable group and the monomer (ogolimer) imparts t-,
As the non-polymerizable solid resin, polyester resin, polyurethane resin, amino acid resin, diallyl phthalate resin,
Ketone resin, methacrylic resin, styrene resin, styrene maleate resin, epoxy resin, vinyl acetate resin, polybutasicon resin, etc. may be used. At this time, the liquid radically polymerizable monomer or oligomer includes trimethylolpropane tri(meth)acrylate,
(meth)acrylate monomers such as pentaerythritol hexa(meth)acrylate, tetraethylene glycol di(meth)acrylate)S phenoxyethyl(meth)acrylate, these methacrylate monomers, and polyether polyol poly(meth)acrylate, Ogolimers such as polyether polyol poly(meth)acrylate and polyepoxy polyacrylate may be used. Furthermore, as a photopolymerization initiator, pen/phenone, chlorobenzophenone, methyl orthobenzoylbenzoate, thioxanthone, dichlorovirthioxanthone,
pennol, bipenzoyl, benzoin ethyl ether,
α.Hydroxy-isobutylphenone, paratertiary butyl dichloroacetophenone, jetoxyacetophenone, etc. are used. Also, as a photopolymerization accelerator, 4.4
'Bis(diethylamino)benzophenone, ethyl N-dimethylaminobenzoate, dimethylethanolamine, glycine, etc. may be used.

On the other hand, in the case of producing a cationic polymerizable resin, a resin that is solid or semi-solid at room temperature, a compound containing an epoxy group that is liquid at room temperature, and a photopolymerization initiator may be mixed.

In addition, the above resin may contain an epoxy group◎
Further, if the resin contains sufficient epoxy groups for polymerization and the mixture exhibits tackiness at room temperature or below 100°C, mixing of the liquid epoxy group-containing compound may be omitted.

Therefore, as the above-mentioned resin for obtaining such a cationic polymerizable composition, various compounds such as bisphenol A7 glycidyl ether, bisphenol A diβ methyl glycidyl ether, noblack glycidyl ether, brominated bisphenol A noglycidyl ether, etc. A solid or semi-solid resin may be used. Epoxy compounds that are liquid at room temperature include bisphenol A diglycidyl ether, bisphenol F7 gunnol ether, resolunol diglycidyl ether, polyalkydine glycol glycidyl ether, water-added bisphenol A diglycidyl ether, vinylcyclohexene diepoxide, Cyclopentasoethioxide, bi(3,4epoxy6methylcyclohexylmethyl)adipate, etc. are used. As a photopolymerization initiator, Lewis acid diazonium such as paramethoxybenzenediazonium hexafluorophosphate, noyaracrobenzenediazonium hexafluorophosphate, 2.4-)methoxybenzenediazonium tetrafluoroborate, etc. In addition, iodonium salts such as diphenyliodonium hexafluorophosphate and diphenyliodonium tetrafluoroborate, and sulfonium salts such as triphenylsulfonium hexafluorophosphate and trinohenylsulfonium tetrafluorophosphate are used. Yes.

In addition, photopolymerization initiators with poor thermal stability, such as benzoyl and its rust conductor in the case of radical types, and diazonium salts in the case of cationic types, are used as a t-i solution. It is necessary to apply it to the support film 108. After the application, it is necessary to immediately perform the above-mentioned close bonding and exposure. Furthermore, the cationic type has great advantages, such as being able to be exposed to light in the atmosphere, since it does not have the so-called air-inhibiting effect on curing.

Next, using the photosensitive resin film 8 having such a composition, fI:
A specific example of the method will be explained.◎First, an ultraviolet curable composition with the composition shown in the following table is prepared, and this is coated on a 25 μm thick polyester film with a coater to form a 25 μm photosensitive resin layer. Coated @Table 1 Then, put this coated product in an electric oven at 80℃ for 1
The solvent was evaporated by heating for a minute to obtain a photosensitive laminate. Thereafter, this was brought into close contact with the viewing surface of the screen body 7 by vacuum lamination, and only the above film was completely peeled off.

After that, in order to expose the photosensitive resin from the projection surface side of the screen body 70, a mercury lamp was used from a position 1.2 m away after removing the air inside the baking frame for mounting the plate. It was exposed to light.

Thereafter, the screen body 7 was taken out from the baking frame, and fine graphite powder having an average particle size of 3 μmφ was uniformly sprinkled on the photosensitive resin layer, and the mixture was left in an electric oven at 80° C. for 1 minute. Immediately thereafter, fine graphite powder was lightly pressed onto the resin layer using a silicone cloth to adhere to the softened unexposed portion. After that, it was slowly cooled to room temperature, and the entire surface was exposed to light under a high-pressure mercury lamp (80W/crn input) at a distance of 10an under a high-pressure mercury lamp (80W/crn input), and the uncured portion was placed on a belt conveyor moving at a speed of 5n1/min. hardened.

Thereafter, the adhered graphite fine powder that was opaque was brushed away, and a screen with a highly accurate light-shielding film 8 that achieved the desired purpose was obtained.

As another example, a photosensitive resin film having the composition shown in Table 2 was used, which was brought into close contact with the observation surface of the screen body 7, and exposed and colored films were formed in the same manner. In this case, a powdered black toner for electrophotographic development was used as the fine powder for coloring, and it was confirmed that a light-shielding film with high aperture accuracy could be similarly formed.

As explained above, according to the method of the present invention, a photosensitive resin film is uniformly formed on the viewing surface of the screen main body, and then colored after being exposed to light. A screen with excellent aperture accuracy and a 7C light-shielding film can be effectively manufactured. Therefore, its practical advantages are enormous.

It goes without saying that the present invention is not limited to the embodiments described above, and can be implemented with various modifications without departing from the spirit thereof.

[Brief explanation of the drawing]

11th! ! ! , 1 to 5 are diagrams for explaining the structure and outline of a transmission type projection screen, and FIGS. 6 and 7 are diagrams for explaining conventional problems in forming a light-shielding film.
FIGS. 8 to 11 are diagrams for explaining manufacturing steps according to an embodiment of the present invention, respectively. 7...Screen body, 6a+6b...Convex lens surface, 8...Light-shielding coating, 1o...Photosensitive resin film, 11
...frame body. Applicant's agent Patent attorney Takehiko Suzue (a) (b) yPa diagram) l? Figure 7 N 81NI Spear 9 II Continuation of page 1 [Phase] Inventor Address 1) Masitsugube 1, Chuo-ku, Tokyo
0 in-house Inventor Atsushi Hirokawa 1 in-house, Chuo-ku, Tokyo

Claims (1)

[Scope of Claims] After the resin film is brought into close contact with the observation surface by making the gas pressure in the space formed between the screen main body and the viewing surface lower than that on the outside of the resin film, light is irradiated from the projection surface side of the screen main body. exposing the photosensitive resin film of the light-transmitting portion to light, and coloring the photosensitive resin film other than the exposed portion,
A method of manufacturing a transmission projection screen, comprising removing at least an exposed portion of the photosensitive resin film from the viewing surface. (2) The process of bringing the photosensitive resin film into close contact with the observation surface of the screen body is performed while the photosensitive resin film is heated to a temperature near its softening point. A method of manufacturing a transmission type projection screen. (3) The method for manufacturing a transmission projection screen according to claim 1, wherein the photosensitive resin film is a layer formed by laminating a photosensitive resin layer on a film-like support.