Surface light source device having shielding layer

Details Surface light source device having shielding layer Surface light source device having shielding layer

1997-10-17

2000-06-27

O'Shea, Sandra

Illumination

Revolving

362 29, 362298, 362299, 362301, 362303, 362346, 362349, F21V 704

Patent

active

060798408

ABSTRACT:
There is provided a surface light source device of side light type, which is not reduced in efficiency of illumination light utilization, even if the surface light source device is subjected to fringing such as to trim a luminant portion. For instance, a light shielding layer formed by coating black ink 21A, which absorbs illumination light, by means of printing is provided on a protection sheet 21 arranged as the outermost emission-side additional sheet. The light shielding layer absorbs and shields illumination light L1 tending to be transmitted through a peripheral edge portion of the protection sheet 12, and as a result, provides fringing. A reflective surface is formed by applying a silver tape 21B or the like to a surface facing the light guide plate 6. Since illumination light reflected by the silver tape 21B is used again inside the light guide plate 6, it is possible to avoid a reduction in efficiency of light utilization. The reflective layer may be narrower or wider than the light shielding layer, or may be equal in width to the light shielding layer at need. The reflective surface and the light shielding layer may be also formed on other components.

REFERENCES:
patent: 4648690 (1987-03-01), Ohe
patent: 5207493 (1993-05-01), Murase et al.
patent: 5392199 (1995-02-01), Kashima et al.
patent: 5560698 (1996-10-01), Okano

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