Prism plate for efficiently emitting light flux within a predete

Details Prism plate for efficiently emitting light flux within a predete Prism plate for efficiently emitting light flux within a predete

1995-09-25

1997-05-06

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 37, 385147, 385901, 362 26, 362 31, 362 32, 362302, 362309, 359834, 349 62, 349112, 349113, G02B 634, F21V 904

Patent

active

056279264

ABSTRACT:
An information indicator suitable for information processors such as personal computers, word processors and the like includes a light source, a scattering plate which scatters light from the light source, an indicator plate irradiated with scattered light from the scattering plate, and a prism plate operatively arranged with respect to the scattering plate and the indicator plate and having a prism-like protuberance structure formed at a side thereof. The prism plate is so disposed that the prism-like protuberance structure faces the scattering plate, and the angle 2.theta. constituting the prism-like protuberance structure is defined by the formula, 2.theta..ltoreq.2/3.times.(.pi./2+2.times.arcsin (n'
)), in this inequality, n is the refractive index of said prism plate medium, and n' is the refractive index of a material in which the prism plate is arranged.

REFERENCES:
patent: 5050946 (1991-09-01), Hathaway et al.
patent: 5211463 (1993-05-01), Kalmanash
patent: 5237641 (1993-08-01), Jacobson et al.
patent: 5303322 (1994-04-01), Winston et al.
patent: 5339382 (1994-08-01), Whitehead
patent: 5353133 (1994-10-01), Bernkopf
patent: 5359691 (1994-10-01), Tai et al.
patent: 5467417 (1995-11-01), Nakamura et al.
patent: 5479275 (1995-12-01), Abileah

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