Optical switch element and a liquid crystal light directional co

Optical: systems and elements – Holographic system or element – Having optical element between object and recording medium

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359 94, 359100, 385 1, G02F 113, G02F 1137

Patent

active

053812514

ABSTRACT:
An optical switch element for selectively transmitting or shielding light from a first optical wave guide to a second optical wave guide is disclosed. The optical switch element includes a first optical switch portion and a second optical switch portion. The first optical switch portion includes: a part of said first optical wave guide; a first liquid crystal layer optically connected to said part of said first optical wave guide; a first part of said second optical wave guide optically connected to said first liquid crystal layer; and first voltage applying means for applying voltage to said first liquid crystal layer to change a refractive index of said first liquid crystal layer. The second optical switch portion includes: a second part of said second optical wave guide; a second liquid crystal layer optically connected to said second part of said second optical wave guide; and second voltage applying means for applying voltage to said second liquid crystal layer to change a refractive index of said second liquid crystal layer. In a case where light is transmitted from said first optical wave guide to said second optical wave guide, said first optical switch portion is in a transmitting state, and said second optical switch portion is in a shielding state, and in another case where light is shielded from said first optical wave guide to said second optical wave guide, said first optical switch portion is in a shielding state, and said second optical switch portion is in a transmitting state.

REFERENCES:
patent: 3920314 (1975-11-01), Yajima et al.
patent: 4721352 (1988-01-01), Sorin et al.
patent: 4813771 (1989-03-01), Handschy et al.
patent: 4836657 (1989-06-01), Gunji et al.

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