| 摘要 |
PURPOSE:To obtain a screen of high quality and high contrast which is easy to manufacture by using a sheet of lens plate of the shape resembling to the sectional shape of the sum of Fresnel lenses and renticular lenses. CONSTITUTION:One side of a screen is formed of a renticular plate 13 having the Fresnel lens effect of the shape resembling to the shape of the sum of Fresnel lenses and renticular lenses, and the other side is formed of a diffusion layer 14 and partially laminated black objects 15, whereby the screen is constituted. The high contrast screen of high quality which is easy to manufacture and is stable for a long period of time to temp. and humidity is obtained by the system of using one sheet of the lens plate without constituting the same of two sheets. |
