System for partially erasing thermally written liquid crystal el

Details System for partially erasing thermally written liquid crystal el System for partially erasing thermally written liquid crystal el

1993-02-25

1993-12-07

Sikes, William L.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359 40, 359 86, 345 10, G02F 1133

Patent

active

052687767

ABSTRACT:
The liquid crystal is written with a laser beam. The laser beam generated by a laser source is applied through an optical control unit such as galvanometer mirrors to the liquid crystal. To erase a part of the data written in the previous time completely, the liquid crystal is irradiated with the laser beam slightly wider than the portion that was thermally written on the liquid crystal in the previous time.

REFERENCES:
patent: 3796999 (1974-03-01), Kahn
patent: 3988056 (1976-10-01), Hareng et al.
patent: 4031529 (1977-06-01), Borel et al.
patent: 4499458 (1985-02-01), Le Berre et al.
patent: 4696550 (1987-09-01), Shionoya

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