Light beam scanning apparatus, and read-out apparatus and record

Details Light beam scanning apparatus, and read-out apparatus and record Light beam scanning apparatus, and read-out apparatus and record

1986-04-08

1988-07-19

Sikes, William L.

350 9614, G02B 634

Patent

active

047580623

ABSTRACT:
A light beam scanning system comprises a stack of a wave guide layer and an adjacent layer normally exhibiting a refractive index smaller than that of the wave guide layer, the wave guide layer and/or the adjacent layer being made of a material whose refractive index changes by the application of energy. Many energy application devices are positioned at the wave guide layer and/or the adjacent layer along an optical path of wave guided inside of the wave guide layer. Dielectric gratings are positioned on the adjacent layer so as to correspond to sections where energy is applied. A drive circuit is provided for sequentially and selectively energizing the energy application devices, and changing the refractive index of the wave guide layer and/or the adjacent layer so that the guided wave is radiated out of the stack by interaction with the dielectric gratings at the sections where energy is applied.

REFERENCES:
patent: 4571024 (1986-02-01), Husbands

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