Point array sheet lighting apparatus

Details Point array sheet lighting apparatus Point array sheet lighting apparatus

1978-03-24

1979-04-24

Nelson, Peter A.

Illumination

Revolving

362 32, 362297, 40546, 350 9610, F21V 704

Patent

active

041515820

ABSTRACT:
An illumination device for establishing an array of point light sources, wherein the light sources are generally closely spaced. In a first embodiment a planar substrate is provided with an array of apertures. One surface of the substrate is coated with a first coating having a first index of refraction, the coating extending into the sides of the apertures. A second coating having a second and higher index of refraction is applied on top of the first coating and is coextensive therewith. Light fed into the edges of the second coating passes by internal reflection to the apertures where it exits, parallel with the aperture axes. In a second embodiment, the array of point sources is defined by beam-compressor lenses supported on a rigid, planar substrate. Each column of lenses is positioned adjacent an edge of an internally reflecting sheet, there being as many sheets as columns. An opposite edge of each sheet receives light, to thereby illuminate the input ends of the beam-compressor lenses. In a third embodiment, reflecting faces are formed integrally with a planar sheet of a transparent substance. Light fed edgewise into the sheet is reflected upwardly by the arrayed faces.

REFERENCES:
patent: 1800452 (1931-04-01), Karnasch
patent: 2507035 (1950-05-01), Maynard
patent: 2563191 (1951-08-01), Russ
patent: 2775687 (1956-12-01), Cushman
patent: 3062441 (1962-11-01), Martin
patent: 3444385 (1969-05-01), Paglee
patent: 3535537 (1970-10-01), Powell
patent: 3576430 (1971-04-01), Fickenscher
patent: 3692383 (1972-09-01), Herod et al.
patent: 4053206 (1977-10-01), Yevick
patent: 4082029 (1978-04-01), Rumer, Jr. et al.
Stanley, IBM Tech. Disc. Bull., vol. 14, #2, Jul. 1971, pp. 452-453.
Foglia, IBM Tech. Disc. Bull., vol. 4, #4, Sep. 1961, p. 45.

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