Surface light source device of side-light type

Details Surface light source device of side-light type Surface light source device of side-light type

1997-03-25

2000-04-11

Bovernick, Rodney

Optical waveguides

Optical imaging tunnel

359251, 349 62, 353 81, 362 31, G02B 610

Patent

active

060496495

ABSTRACT:
A surface light source device of side-light type enables concentrated output of illumination light to a frontal direction. A flux having clear directivity is outputted from window portions 1w on an emitting surface 5 of a light guide plate 1 with emitting directivity. This flux is represented by a beam C01 outputted in a direction at an angle of 70.degree.. A flux C02 incident on reflection portions 1r is returned to the light guide plate 1 and is given an opportunity of output from the window portions 1w again. The flux C01 having escaped from the window portions 1w to an air layer AR is obliquely incident on flat regions 14g of a propagation direction characteristics modifier 14, and a degree of parallelization of the flux in a propagation direction is improved. The flux is blocked by the reflection portions 1r from being incident on a notch portion (uneffective area) between the flat regions 14g. After total reflection by a total reflection surface 14b of each projection element 14c, the flux is outputted from a flat outside surface 14h to a frontal direction without degrading the improved degree of parallelization. The projection elements 14c may be two-dimensionally arrayed. A prismatic groove or a cylindrical lens array may be formed on the outside surface 14h to two-dimensionally enhance the degree of parallelization.

REFERENCES:
patent: 5396350 (1995-03-01), Beeson et al.
patent: 5428468 (1995-06-01), Zimmerman et al.
patent: 5598280 (1997-01-01), Nishio et al.
patent: 5598281 (1997-01-01), Zimmerman et al.
patent: 5671994 (1997-09-01), Tai et al.
patent: 5841572 (1998-11-01), Ando et al.

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