Reflection type projection screen, production process thereof, and production apparatus thereof
US5361163A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1993 |
| Grant date | Nov 1, 1994 |
| Priority date | — |
| Expiry date | Nov 22, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B2227/325
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A reflection type projection screen is constituted as follows. Provided in order on a light absorbing layer 5, which is a dark plastic sheet or a solid print of a dark ink, are a fibrous sheet 4 of glass fibers, a white, opaque base material sheet 3made with a plastic sheet, and a light diffusing layer 2 of a translucent plastic into which a lustrous pigment or calcite powder is incorporated. An emboss 9 is formed on the outer surface of the light diffusing layer 1. It is preferable that a reflection layer 2 printed with an ink containing a lustrous pigment or calcite powder is provided below the light diffusing layer 1. Light absorbing stripes 11 are provided each at a position corresponding to a concave portion 9a of the emboss 9 on the surface of the base material sheet 3 adjoining the light diffusing layer 1. A production process and a production apparatus of a reflection type screen, which can efficiently produce reflection type screens with the emboss are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.