Wide angle light coupler for image illumination

Details Wide angle light coupler for image illumination Wide angle light coupler for image illumination

1994-01-10

1995-10-17

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Internal light source

362 32, 362297, 362307, 362346, 359 49, G01D 1128

Patent

active

054596459

ABSTRACT:
Back lighting for an transmissive display panel such as a transparency or a liquid crystal display for direct viewing or image projection is afforded by a light source spaced from the display panel and an intervening light coupler comprising a tapered duct with reflective inner walls such as a frustoconical mirror. The small end of the duct is adjacent the light source and may include a diffuser film to enhance light uniformity at the display. Light reflection from the reflective walls provides off-axis viewability with substantially uniform brightness. The light coupler is useful in a vehicular head up display.

REFERENCES:
patent: 1595173 (1926-08-01), Stiert
patent: 3419986 (1969-01-01), Maze
patent: 3711701 (1973-01-01), Squyres
patent: 4274131 (1981-06-01), Praamsma
patent: 4765718 (1988-08-01), Henkes
patent: 4915479 (1990-04-01), Clarke
patent: 4950059 (1990-08-01), Roberts
patent: 5134548 (1992-07-01), Turner

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