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

1993-09-08

1995-11-14

Healy, Brian

Optical waveguides

With optical coupler

Input/output coupler

385 37, 385147, 385901, 362 26, 362 31, 362 32, 362302, 362309, 359 48, 359 49, 359 40, 359 69, 359 70, 359834, G02B 634, F21V 904

Patent

active

054674174

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.>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: 5220377 (1993-06-01), Suzuki et al.
patent: 5271077 (1993-12-01), Brockman et al.
patent: 5337381 (1994-08-01), Biswas et al.
patent: 5339382 (1994-08-01), Whitehead
patent: 5353133 (1994-10-01), Bernkopf
patent: 5363458 (1994-11-01), Pan et al.

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