Patent · US Expired

Daylight projection screen and method and apparatus for making the same

US4172219A · kind A · utility

42Cited by
12References
10Claims
0Family size

Assignee

Inventors

Key dates

Filing dateFeb 24, 1976
Grant dateOct 23, 1979
Priority date—
Expiry dateFeb 24, 1996

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG03B21/60
  • WIPO fieldOptics
  • WIPO sectorInstruments

Abstract

A layer of material which absorbs incident focussed laser light and undergoes a resultant heating is arranged in the focal plane of a lens matrix. Laser light is projected onto such layer through the lens matrix itself. The laser light is focussed by the lens elements of the lens matrix onto the layer effecting a highly localized heating of small well-defined portions of the layer. At those small well-defined portions, the material of the layer, as a result of the highly localized heating, removes itself to form the apertures of a lens-aperture matrix which is thereafter used in cooperation with the lens matrix as a rear projection or daylight projection screen.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.