Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1986-01-30
1987-01-06
Evans, Arthur G.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
350356, 350 9614, 346108, G01D 1514
Patent
active
046350829
ABSTRACT:
A thermo-optic light modulation array is disclosed for use in an imaging system of an electrophotographic printer to produce electrostatic latent images. The array comprises a light transmitting medium arranged in contact with an array of pixel shaped heaters which are selectively energized in response to digitized data signals for pulse heating the portions of the medium in vicinity of the heaters. Temperature gradients in the medium produced by the energized heaters cause changes in the index of refraction of the medium, so that selected portions of a sheet of collimated light directed through the temperature gradients in the light transmitting medium are deflected or modulated. The modulated light may be blocked by a stop and the unmodulated light may be directed to the precharged photoconductive member of the printer to form the latent images or visa versa. Several modes of light modulation are disclosed. In one mode, the light is directed through the medium just above and closely adjacent the heaters in a grazing fashion. A second transmissive mode directs the light through both the medium and transparent heaters, while a third reflective mode directs the light through the medium into reflective surfaces on the heaters. The reflective mode of modulation may be either for the production of linear, one-dimensional lines of picture elements or for the production of full two-dimensional alpha-numeric information. The other modes produce latent images one line of picture elements or pixels at a time.
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Domoto Gerald A.
Sereny Aron
Chittum Robert A.
Evans Arthur G.
Xerox Corporation
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