JPS60232539A - Manufacture of transmission type screen - Google Patents

Abstract

PURPOSE:To mass-produce the titled transmission type screen at low cost by forming films of a light-absorbable material on projection parts of a metallic mold, pressing the metallic mold against a lenticular lens, and adhering the films to the lens. CONSTITUTION:A lens sheet 1 is molded having a Fresnel lens 3 on one surface and a lenticular lens 2 on the other surface, respectively. The metallic mold 5 for forming a light absorbable layer 4 is provided at recessed parts conforming to the shape of light projection parts 21 of the lenticular lens 2 of the lens sheet 1. The films 41 are formed of the light absorbable material on projection parts 52 of the metallic mold 5 by a roll coating or silk screen printing method, etc. Then, the metallic mold 5 is pressed against the lenticular lens 2 of the lens sheet 1 to adhere edges of the films 41 to parts 23 on total reflecting surfaces 22 of the lenticular lens 2, and the metallic mold 5 is released after the adhesion.

Description

[Detailed description of the invention]

11 column pressure”

[Industrial application field]

The present invention relates to an improvement in a transmission screen having a Fresnel lens on one side of a single lens sheet and a Lenticular lens on the other side, and also includes a manufacturing method thereof.

[Conventional technology]

For transmission screens, a combination of a Fresnel lens sheet, which has the effect of diffusing light, and a lenticular lens sheet, which has the effect of collecting light, has been used. By using a one-piece lens sheet with a Fresnel lens on one side and a lenticular lens on the other side, it can be manufactured in -1 molding steps, resulting in simplification and savings in raw materials, reducing costs. becomes possible. These transmissive screens have a black light-absorbing part in the light-opaque part between the lenticular lenses in order to reduce the influence of reflection of external light and make the image on the screen clearer.
Formation of so-called black stripes is being carried out.

[Problem to be solved by the invention]

Formation of black stripes is generally done by painting, but if you paint directly on a total reflection surface, the difference in refractive index between the paint vehicle and the total reflection surface will be small and the total reflection surface will no longer function as a total reflection surface. A method is used in which the material is vapor-deposited, etc., and then painted. However, this method requires masking the light exit surface before vapor deposition, and then involves the labor-intensive steps of vapor deposition, painting, and finishing, which makes mass production impossible and the products are expensive. becomes. An object of the present invention is to provide a transmission screen that solves the above problems and a method that can produce the screen in large quantities at low cost. l”fish 1t

[Means for Solving the Problems 11] The transmission screen of the present invention comprises a transparent or translucent material having a Fresnel lens 3 on one surface and a lenticular lens 2 on the other surface, as shown in FIG. In the transmission type screen consisting of the sheet 1, a part 23 on the adjacent total reflection surface 22 is bonded to it so as to cover the total reflection surface 22 and the lens boundary 24, except for the light exit part 21 of the lenticular lens 2. It is characterized in that a light absorption layer 4 is provided. [Operation] In order to cause total reflection on the total reflection surface 22 of the lenticular lens 2, n2 is the refractive index of the resin used for the lens, nl
If is the refractive index of the layer in contact with the lens, θ>3in-'
l−n 1/n 2 is required, and the smaller nl is, the easier the total reflection is. However, in the case of ordinary synthetic resins, n=1.4 to 1.degree. 6, so if a light absorption layer is formed directly on the total reflection surface, total reflection becomes difficult. On the other hand, since air is n-1, the total reflection surface 22
By not bringing the light-absorbing resin into close contact with the light-absorbing resin and by allowing air to exist in the space 6 formed by the light-absorbing layer 4 and the adjacent total reflection surface 22 covered by it, it is possible to efficiently totally reflect the incident light. can.

[Means for Solving the Problems 2] The method for manufacturing the improved transmission screen of the present invention is to first use a transparent or semi-transparent material, a Fresnel lens 3 on one surface and a lenticular lens 2 on the other surface. A transparent screen made of a lens sheet 1 having a lenticular lens 2 is molded, and a light-absorbing material is applied to a convex portion 52 of a mold 5 having four portions 51 corresponding to the light emitting portion 21 of the lenticular lens 2.
, press the mold against the lenticular lens 2,
It is characterized in that the light absorbing layer 4 is formed by adhering the cover 11J41 to a portion 23 on the lenticular lens 2.

【Example】

Suitable materials for the lens sheet are vinyl chloride resin, acrylic resin, etc. These resins are processed by means such as press molding, injection molding, or extrusion molding, and a Fresnel lens 3 is formed on one surface and the other surface. lenticular lens 2
A lens sheet 1 having the following properties is molded. As described above, the mold 5 for forming the light absorption layer 4 is used to form the light indexing portion 21 of the lenticular lens 2 of the lens sheet 1.
Set up a recess that matches the shape of the hole. The recesses can be provided by cutting or etching, but it is also possible to make a copy of the lens sheet 1 using the lenticular lens 2 as a base and then cut out a part of it. A coating 41 of a light-absorbing material is formed on the convex portion 52 of the mold 5 prepared in this manner by a method such as roll coating or silk screen printing. It is also possible to adopt a method of providing a conductor layer on the convex portion 52 of the mold 5 and forming a thick film by electrodeposition, thereby increasing the strength of the film. The mold 5 on which the coating 41 of a light-absorbing material is placed is pressed against the lenticular lens 2 of the lens sheet 1 as shown in FIG.
The end of the lenticular lens 2 is bonded to a portion 23 on the total reflection surface 22 of the lenticular lens 2. After adhesion, the mold 5 is released. When the edge of the convex portion 52 of the mold 5 is chamfered to match the inclination of the part 23 on the total reflection surface 22 of the lenticular lens 2 in contact with it, the i! This is preferable because it is not only convenient for adhering the mold 5 to the lenticular lens 2, but also allows easy positioning when matching the mold 5 to the irregularities of the lenticular lens 2. Of course, it is also advantageous to use an adhesive as a means of adhesion.
After forming 1, a hot melt or heat curing adhesive may be applied and heat lamination may be performed. This also serves to strengthen the light absorbing layer. 11 Sad 11 The black stripe transmissive screen of the present invention is
Since the manufacturing process does not require vapor deposition or pre-processing such as mammating, it is easy to produce in large quantities and can be provided easily.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a transmission screen of the present invention. FIG. 2 is a cross-sectional view for explaining the method of manufacturing a transmission screen of the present invention. 1... Lens sheet 2... Lenticular lens 3... Fresnel lens 4... Light absorption layer Utility model registration applicant Dai Nippon Printing Co., Ltd. Agent Patent attorney Souo Suga

Claims (4)

[Claims] (1) In a transmission screen consisting of lens sheets 1 to I, which have a Fresnel lens 3 on one surface of a transparent or semi-transparent material and a lenticular lens 2 on the other surface,
Excluding the light emitting part 21 of the lenticular lens 2, a light absorption layer 114 is provided on a part 23 of the total reflection surface 22 adjacent to each other so as to cover the total reflection 1122 and the lens boundary part 24, and is bonded thereto. 4 and the adjacent total reflection ff122 covered by the transmissive screen, in which air exists in the space 6 formed by the ff122. (2) A lens sheet 1 having a Fresnel lens 3 on one surface and a lenticular lens 2 on the other surface is molded from a transparent or translucent material, and has a concave portion 51 corresponding to the light emitting portion 21 of the lenticular lens 2. The light-absorbing layer 4 is formed by forming a coating 41 of a light-absorbing material on the convex portion 52 of the mold 5, pressing the mold against the lenticular lens 2, and adhering the coating 41 to a portion 23 on the lenticular lens. 1. A method of manufacturing a transmission screen, comprising: providing a transparent screen. (3) The manufacturing method according to claim 2, wherein a coating 41 of a light-absorbing material is formed on the convex portion 52 of the mold 5, and an adhesive is applied thereon. (4) The manufacturing method according to claim 2, in which a mold having a conductor in the convex portion 52 of the mold 5 is used, and the covering 1141 of the light-absorbing material is formed by electrodeposition coating.