Planar luminescent device

Details Planar luminescent device Planar luminescent device

1989-01-23

1990-06-12

Lazarus, Ira S.

Illumination

Illuminated scale or dial

Edge illuminated modifier or light rod/pipe

362 29, 362 31, 350345, F21V 800

Patent

active

049338145

ABSTRACT:
A planar luminescent device comprising a light source whose luminance distribution exhibits varied luminous intensity from a high level to a low level, a light transmitting plate having a light transmitting property and shaped in a planar form, and a reflecting frame for enclosing the light source in cooperation with the surface of a printed board to which the light source is attached and the end face of the light transmitting plate and also holding the light transmitting plate having its end faces on which the light from the light source does not impinge in close contact therewith, in which a portion on an end face of the light transmitting plate is disposed closest to the position where the luminance of the light source is at the low level and incident light on the end face is adapted to be scatteringly reflected by a scattering reflection layer disposed on the back face of the light transmitting plate and radiated from the surface of the same.

REFERENCES:
patent: 2354367 (1944-07-01), Ford
patent: 2594459 (1952-04-01), Larson, Jr.
patent: 3023304 (1962-02-01), Peterson
patent: 4791540 (1988-12-01), Dreyer, Jr. et al.

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