Recording apparatus with double frequency driven liquid crystal

Details Recording apparatus with double frequency driven liquid crystal Recording apparatus with double frequency driven liquid crystal

1984-09-14

1987-02-03

Broome, Harold

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

350331T, 350346, G01D 1514

Patent

active

046411569

ABSTRACT:
In the recording apparatus of this invention, liquid crystal light shutter operates by using the double frequency drive. The double frequency drive utilizes signals of a high frequency f.sub.H and lower frequency f.sub.L. The dielectric anisotropy of liquid crystal matrial becomes positive in the case of the frequency f.sub.L lower than crossover frequency f.sub.C and becomes negative in the case of the frequency f.sub.H higher than the frequency f.sub.C. When the data signal including the signal of the frequency f.sub.L for a final period of a writing cycle Tw, is applied to write selection electrodes and data signal electrodes, liquid crystal light shutter is kept open for the final period of the writing cycle Tw, namely, opening or closing state of the shutter which is caused during a selection period can be eliminated.

REFERENCES:
patent: 4231035 (1980-10-01), Van Doorn et al.
patent: 4236150 (1980-11-01), Chern
patent: 4386836 (1983-06-01), Aoki et al.

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