Light guide plate and a planar lighting device using the same

Details Light guide plate and a planar lighting device using the same Light guide plate and a planar lighting device using the same

2006-12-27

2008-11-04

Truong, Bao Q (Department: 2875)

Illumination

Light modifier

Refractor

C362S224000, C362S614000, C362S615000, C362S628000, C362S629000

Reexamination Certificate

active

07445358

ABSTRACT:
A light guide plate of the invention has a plurality of unit light guide plates that are formed of a transparent resin material and which are joined together. Each of the unit light guide plates has a flat rectangular light exit surface and a back surface that is opposite the light exit surface and which has a parallel groove formed in generally a center and parallel to a side of the rectangular light exit surface. The light guide plate is used with a linear light source fitted in the parallel groove, satisfying the inequality (L0/280)2·k(14T2+710T)·(−0.65 log S+1.9)≦10, where L0is the length (mm) of the light guide plate, k is the linear expansion coefficient [/° C.] of the resin material, Ts is the surface temperature [° C.] of the linear light source that has become stable, S is half of the cross-sectional area [mm2] of the unit light guide plate as it is cut through a plane perpendicular to the parallel groove, and T=Ts −25.

REFERENCES:
patent: 6709122 (2004-03-01), Adachi et al.
patent: 6883950 (2005-04-01), Adachi et al.
patent: 2003/0202363 (2003-10-01), Adachi et al.
patent: 8-062426 (1996-03-01), None
patent: 9-304623 (1997-11-01), None
patent: 10-133027 (1998-05-01), None
patent: 2005-234397 (2005-09-01), None
patent: WO 2005/080863 (2005-09-01), None

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