Spread illuminating apparatus having light coverging means

Details Spread illuminating apparatus having light coverging means Spread illuminating apparatus having light coverging means

2007-10-23

2007-10-23

Husar, Stephen F (Department: 2875)

Illumination

Edge lighted panel

Light guide

C026S027000, C026S026000, C026S026000, C026S026000, C026S026000, C385S901000

Reexamination Certificate

active

10760587

ABSTRACT:
A spread illuminating apparatus includes a light converging element which has a refractive index profile in a direction orthogonal to two major surfaces of a light conductive plate, and which is disposed between at least one light source and one end surface of the light conductive plate. The light converging element comprises: a plurality of transparent resin films which have respective refractive indexes so as to constitute a refractive index gradation mirror-imaged with respect to the center plane of the light converging element, and which are layered over one another; and a plurality of light-transmittable adhesive layers each of which is sandwiched between two adjacent transparent resin films.

REFERENCES:
patent: 6371623 (2002-04-01), Toyoda
patent: 2002/0135560 (2002-09-01), Akaoka
patent: 2003/0117792 (2003-06-01), Kunimochi et al.
patent: 2004/0130880 (2004-07-01), Min et al.
patent: 07-225301 (1995-08-01), None
patent: 07-318934 (1995-12-01), None
patent: 10-020239 (1998-01-01), None
patent: 11-202799 (1999-07-01), None

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