JPH0244330A - Transmission type screen - Google Patents

Abstract

PURPOSE:To prevent the hue of an image from deteriorating caused by the horizontal arrangement of a cathode-ray tube and to make screen characteristics superior by providing the front of the screen with a fine irregular transparent sheet and more widely diffusing an outgoing beam on the irregularity. CONSTITUTION:The transparent sheet 4 having fine irregularity is provided at the front of the screen 1. The material of this irregular-shaped sheet 4 can be resin such as acrylic resin, polycarbonate resin, transparent nylon, and transparent polyester. Besides, the pitch of the irregularity should be much smaller than that of a lenticular lens. Thus, the screen characteristics is superior without diferring in hue when a screen is looked from every direction since a beam incident on the screen 1 widely diffuses on the curved face of the transparent sheet 4 which has fine irregularity.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a transmissive screen that forms images of television, slides, movies, etc. on the back 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 and a lenticular lens are constructed on both sides of a temporary sheet (Japanese Patent Application Laid-Open No. 57-210333), and a two-piece type in which a Fresnel lens plate and a lenticular lens plate are combined as a set. (Japanese Unexamined Patent Publication No. 58-86732) is used. FIG. 3 shows an example of projecting a television image.

The incident light beam 6 is converted into a parallel light beam 7 by the Fresnel lens sheet 2, and into a scattered light beam 8 by the lenticular lens sheet 3, which reaches the eye of the appraiser.

Problems to be Solved by the Invention It is expected that the image projected by the configuration shown in FIG. 3 will have the same color tone no matter what angle it is viewed from. However, as shown in FIG. 4, the projection tubes include a blue projection tube (B-CRT) 11, a green projection tube (G-CRT) 12, and a red projection tube (R-CRT) 13.
Since the lights are arranged in a row, the angles of incidence on the screen 20 are slightly different. #iInspector9I! Since the red light 16 is more strongly incident on the camphor tree than the blue light 14, the screen appears red, and the blue light 17 is more strongly incident on the eye of the appraiser 10 than the red light 19, so the screen appears blue.

Green light 15.18 has an intermediate feel and does not feel particularly strange, but because of this phenomenon, the color tone of transmissive screens differs depending on the viewing direction.

In view of the above problems, the present invention provides an excellent transmission screen whose color tone does not vary depending on the viewing angle.

Means for Solving the Problems In order to solve the above problems, the transmission screen of the present invention has a structure in which a transparent sheet having fine irregularities is provided on the front surface of the screen.

Effect: Due to the above-described structure, the light incident on the screen is widely diffused and emitted by the curved surface of the transparent sheet having minute irregularities, so the screen has excellent screen characteristics where the color tone does not differ when viewed from any direction. shows.

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

FIG. 1 is a diagram showing the configuration of a transmission type screen according to the present invention. In FIG. 1, 1 indicates a conventional screen, 2 a Fresnel lens sheet, 3 a lenticular lens sheet, 4 a transparent sheet having fine irregularities,
5 is a light shielding part.

The light shielding part 5 cuts stray light generated by irregular refraction and reflection among the light incident on the lenticular lens sheet 3, and also prevents reflection of external light such as indoor light, thereby improving contrast. .

The incident light is converted into parallel light by the Fresnel lens sheet 2 and enters the lenticular lens sheet 3. In the conventional screen, the light is then diffused and emitted, but even so, the deterioration in image tone caused by the horizontal arrangement of the cathode ray tubes shown in FIG. 4 has not been significantly improved.

Therefore, in the present invention, a transparent sheet 4 having fine irregularities is provided on the front surface of the screen 1, and the light from the lenticular lens sheet 3 is diffused widely by this sheet 4. @ Various shapes of the transparent sheet 4 having fine irregularities can be considered, such as one with irregularities on both sides as shown in Figure 2 (a), one with irregularities on both sides as shown in Figure 2 (Φ), and one with irregularities as shown in Figure 2 (C). A conceivable example is one in which only one side, the emission side, is uneven. As the material for these uneven sheets, resins such as acrylic resin, polycarbonate resin, transparent nylon, and transparent polyester can be used. Further, the pitch of the unevenness is much smaller than the pitch of the lenticular lens.

In the above example, the pitches of the fine irregularities are arranged in the horizontal direction, so the incident light is diffused only in the horizontal direction. By alternating the vertical and horizontal directions in a cross-shape, the light will be diffused both horizontally and vertically, making it more effective.

As described above, according to this embodiment, by providing a transparent sheet with fine irregularities in front of the screen, the emitted light is widely diffused, so that the deterioration of the image tone that occurs due to the horizontal arrangement of the cathode ray tubes can be prevented. It can be prevented.

Effects of the Invention As described above, in the present invention, by providing a transparent sheet with fine irregularities on the front surface of the screen, the emitted light is widely diffused by the irregularities. It is possible to prevent deterioration and exhibits excellent screen characteristics.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a transmission screen with a transparent sheet with fine irregularities on the front surface of the screen, Figure 2 (a)
, Q)), (C) is an explanatory diagram showing the cross-sectional shape of a transparent sheet with fine irregularities, Figure 3 is an explanatory diagram showing the principle of a conventional transmission screen, and Figure 4 is a diagram of a conventional transmission screen. FIG. 2 is an explanatory diagram of color tone deviation, which is a drawback of . 2... Fresnel lens sheet, 3...
Lenticular lens, 4... Transparent sheet having fine irregularities, 5... Light shielding part. Name of agent: Patent attorney Shigetaka Awano 1 person 3 --- Lenna Kierer Resoz Sheet + --- The details are uneven 2 shoulders 69 hi Sheet 5 -- 1st, 1st, 1st, m- and m- I5-Light 1tL Covering C-・-Human Resistance First East 7-11 Kazue

Claims (2)

[Claims] (1) A transmission screen characterized by having a transparent sheet with minute irregularities provided on the front surface of the screen. (2) A claim characterized in that the transparent sheet having minute irregularities provided on the front surface of the screen is made of transparent fibers of minute diameter woven in a cross shape alternately in the vertical and horizontal directions.
1) Transmissive screen as described.