JPH02187746A - Manufacture of transmission type screen - Google Patents

Abstract

PURPOSE:To facilitate to manufacture a transmission type screen which can freely be selected as a large-sized or a small-sized by filling in a sheet having recessed/projecting parts with a light transmission type resin after forming a light reflecting film on the sheet and grinding both sides of the sheet and obtaining a screen element piece. CONSTITUTION:The screen elemental piece 3 is constituted of the light transmission type resin 1 and the light reflecting film 2. At the time of manufacturing the elemental piece 3, a sheet 4 having processed/projecting parts of the light transmission type resin is manufactured by an injection molding machine, and the light reflecting film 2 is formed on the side of the recessed/projecting parts of the sheet 4 by vapor deposition or plating. After the light transmission type resin 1b is formed on the recessed part of the sheet 4 by the injection molding machine so that the sheet without recessed/projecting parts can be formed, both sides of the sheet are ground so that the light can be made incident or exit and many pieces are arranged as the sheet of a proper-sized elemental piece 3 so as to become a desirable screen, and the screen can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method for manufacturing a transmissive screen that forms images of television, slides, movies, etc. on the back surface of the screen so that the screen can be viewed from the front.

Conventional technology There is a one-piece type in which a Fresnel lens, a lentinide lens, and a lenticular lens are arranged on both sides of a single plate (Japanese Patent Application Laid-Open No. 57210333), and a two-piece type in which a Fresnel lens plate and a lenticular lens plate are combined as a set. JP-A-58-186732) is used. FIG. 7 shows an example of projecting a television image. The incident light beam 5 passes through a Fresnel lens 7
The light beam is converted into a parallel light beam 6 by , and enters a lenticular lens 9 . The incident light is converted into a scattered light beam 11 by the convex cylindrical lens surface 10 on the surface of the lenticular lens 9, and reaches the viewer's eyes.

Problems to be Solved by the Invention It is expected that the image projected by the configuration shown in FIG. 7 will have the same color tone no matter what angle it is viewed from. However, as shown in FIG. 8, the CRT for projection is a blue projection tube (B-CRT). Green projection tube (G-CRT) 14, red projection tube (II-CRT)
) 15 in a row, the angles of incidence on the screen 22 will differ slightly. The red light 18 enters the eyes of the viewer 11 more strongly than the blue light 16, so the screen appears red, and the viewer 12 sees the screen, because the blue light 19 enters the eyes more strongly than the red light 21. feels blue. Green light of 17.20 is somewhere in the middle and doesn't feel particularly strange, but because of this phenomenon with transmissive screens, there is a problem in that the color tone differs depending on the viewing direction.

Means for Solving the Problems In order to solve the above-mentioned problems, the method for producing a transmission screen of the present invention is to form a sheet made of a translucent resin, one side of which is flat and the other side of which is uneven. This manufacturing method includes the steps of forming a film, filling the recesses with the light-transmitting resin, smoothing the film, and polishing both surfaces to produce a screen piece that allows light to enter and exit.

Effect of the present invention By using the above-described manufacturing method, it is possible to easily manufacture a transmission type IJ screen constituted by microscopic light-transmitting elements, and the screen obtained thereby allows incident light to pass through. Since the light is emitted while being reflected by the light-reflecting film surrounding the photopolymer, the emitted light is scattered over a wide angle,
Shows excellent screen characteristics.

EXAMPLE Hereinafter, a method of manufacturing a transmission screen according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a screen piece manufactured by the method for manufacturing a transmission type screen according to an embodiment of the present invention.

In FIG. 1, l is a translucent resin.

Reference numeral 2 denotes a light-reflecting film, and 3 a screen element, which is composed of a translucent resin 1 and a light-reflecting film 2. 2, 3, 4, and 5 show a method of manufacturing the screen element 3 shown in FIG. 1. First, in FIG. 2, 4 is a light-transmitting resin uneven sheet I manufactured by an injection molding machine, and 2 in FIG. 3 is a light-reflecting film. is formed by vapor deposition or plating. FIG. 4 shows that the concave portions of the light-transmitting resin uneven sheet 4 on which the light-reflecting film 2 has been formed are again molded with the light-transmitting resin 1b using an injection molding machine to create a sheet with no unevenness, as shown in FIG. Both sides of the screen are polished to allow light to enter and exit, and a large number of screens are arranged to form a desired screen.

As described above, according to this embodiment, it is possible to easily manufacture a transmission screen composed of microscopic light-transmitting elements. The characteristics of a transmissive screen having such a configuration can be explained using one of the transmissive elements as shown in FIG. That is, when the cross section 24 of the light reflecting film is a straight line as shown in FIG. 6, assuming that the reflection is ideal, the angle of incidence θ is
The incident light beam 25 is reflected by the light reflecting film 2, and as a result, in the example shown in the figure, it exits at an exit angle of ±θ, so the exit light is directed in a direction different from the direction of incidence of the incident light. 9.1, it is possible to prevent the deterioration of image tone that would occur based on the horizontal arrangement of cathode ray tubes shown in FIG.

Effects of the Invention As described above, the present invention forms a sheet with a flat surface on one side and an uneven surface on the other side using a transparent resin, forms a light reflecting film on the uneven side, and then coats the concave portion with the transparent resin. filled with resin,
By using a screen element that has been smoothed and polished on both sides so that light can enter and exit, a transmissive screen of any size can be easily made.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a screen piece manufactured by the method for manufacturing a transmission screen according to an embodiment of the present invention;
FIG. 2 is a perspective view of the screen manufacturing method, FIGS. 3, 4, and 5 are cross-sectional views of the screen manufacturing method, and FIG. 6 is the light incident on one light-transmitting element obtained by the method of the present invention. A cross-sectional view showing the relationship between the incident angle of light and the output angle of emitted light, Fig. 7 is a cross-sectional structural diagram of a conventional transmissive screen, and Fig. 8 is an illustration of color tone deviation, which is a drawback of conventional transmissive screens. It is. L la, lb...Transparent resin, 2...
...Light reflective film, 3...Screen piece, 4...
... Translucent resin uneven sheet, 5 ... Incident light flux, 6 ... Parallel light flux, 7 ... Scattered light flux,
8...Fresnel lens, 9...lenticular lens, 10...convex cylindrical lens surface, 11.12...viewer, 13...
... Blue light projection tube (13-C1?T), 14...
...Green light projection tube (C;-CRT), 15...
・Blue light projection tube (RCRT), 16.19...
Blue light, 17.20... Green light, 18.21...
...Red light, 22...Screen, 23...
・・Translucent resin, 24・・・9.1 Koto, 25a,
25b... Outgoing light flux.

Claims (1)

[Claims] A sheet with a flat surface on one side and an uneven surface on the other side is formed using a translucent resin. After forming a light reflecting film on the uneven side, the recesses are filled with the translucent resin to make it smooth, and then both sides are A method for manufacturing a transmissive screen, characterized by polishing it to allow light to enter and exit.