Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1980-09-17
1983-01-18
Hix, L. T.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
346108, 350356, G01D 1514, G02F 101
Patent
active
043694578
ABSTRACT:
The input data samples for a fringe field responsive electro-optic line printer are differentially encoded and the polarity of the differentially encoded data is periodically reversed, thereby reducing the number of electrodes such a printer requires to achieve a given resolution by a factor of just less than two and protecting the electro-optic element of such a printer against optical damage. The sample-to-sample voltage drops of the differentially encoded data correspond to the magnitudes of the input samples and, therefore, the fringe fields produced within the electro-optic element of the light valve for such a line printer when the encoded samples are applied to the electrodes of the light valve cause the light beam that is transmitted through the electro-optic element to be spatially modulated in accordance with the input samples. Trapped carriers are inhibited from accumulating in the electro-optic element because the nominal polarity of the fringe fields reverses in response to the changes in the polarity of the differentially encoded data.
REFERENCES:
patent: 4281904 (1981-09-01), Sprague et al.
Hix L. T,.
Tarcza Thomas H.
Xerox Corporation
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