Back lighting device with central opening frame member and a uni

Details Back lighting device with central opening frame member and a uni Back lighting device with central opening frame member and a uni

1998-01-29

2000-05-30

Sember, Thomas M.

Illumination

Revolving

362 26, 362226, 349 59, 349 65, F21V 704

Patent

active

060683813

ABSTRACT:
A back lighting device is formed as an assembly of a frame, light waveguide, lamp and terminal assembly and a diffuser sheet. In one embodiment, the lamp and terminal assembly is received in a pocket through a rear opening in the frame and includes terminals having leg portions that are seated on seat portions in the pocket that optimally align a lamp member of the lamp and terminal assembly with an edge of the waveguide to provide optimum light transmission into the waveguide. The diffuser sheet covers the rear of the waveguide and extends across the rear opening of the pocket to limit the escape of light from the pocket and the waveguide to the rear of the back lighting device. The diffuser and frame are preferably molded of a white glass filled material that provides good diffusion of light reflected therefrom and reflects a maximum amount of diffused light back into the waveguide for transmission through a front surface for back lighting of a liquid crystal display or other light receiving member.

REFERENCES:
patent: 5280372 (1994-01-01), Horiuchi
patent: 5313318 (1994-05-01), Gruenberg et al.
patent: 5363294 (1994-11-01), Yamamoto et al.
patent: 5420710 (1995-05-01), Nanbu
patent: 5654779 (1997-08-01), Nakayama et al.
patent: 5815227 (1998-09-01), Lee
patent: 5856855 (1999-01-01), Mol et al.
patent: 5947578 (1999-09-01), Ayres

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