Daylight projection screen and method and apparatus for making t

Details Daylight projection screen and method and apparatus for making t Daylight projection screen and method and apparatus for making t

1976-02-24

1979-10-23

Envall, Jr., Roy N.

Electric heating

Metal heating

By arc

350128, B23K 2700

Patent

active

041722191

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.

REFERENCES:
patent: 2338654 (1944-01-01), MacNeille
patent: 2358070 (1944-09-01), Holmes et al.
patent: 3435186 (1969-03-01), Roshon, Jr. et al.
patent: 3523717 (1970-08-01), Glenn, Jr.
patent: 3560258 (1971-02-01), Brisbane
patent: 3584183 (1971-06-01), Chiaretta
patent: 3617702 (1971-11-01), Flournoy
patent: 3632205 (1972-01-01), Marcy
patent: 3665483 (1972-05-01), Becker et al.
patent: 3704055 (1972-11-01), Hong
patent: 3769488 (1973-10-01), Hasslinger
patent: 4000492 (1976-12-01), Willens
IBM Technical Disclosure, 219/121 L, vol. 9 #11, (1967-Apr.) by Woodward.

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