Surface lighting apparatus

Details Surface lighting apparatus Surface lighting apparatus

1989-07-26

1991-09-17

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 31, F21V 800

Patent

active

050500465

ABSTRACT:
In a surface lighting apparatus (13), a light guide (11) of transparent plastic plate has two trapezium shaped top parts, each having cylindrical holes (11a), (11g) wherein incandescent lamps (9) (10) are mounted, and a reflecting frame (12) having reflective inner walls is disposed closely around the light guide (11), and the light emitted from the incandescent lamps (9) (10) illuminate the LCD (4) uniformly, as backlighting apparatus.

REFERENCES:
patent: 2347665 (1944-05-01), Christensen et al.
patent: 3491245 (1970-01-01), Hardesty
patent: 4630895 (1986-12-01), Abdala, Jr. et al.
patent: 4714983 (1987-12-01), Lang
patent: 4779166 (1988-10-01), Tanaka et al.
patent: 4933814 (1990-06-01), Sanai

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