Document scanning apparatus with photosensor and gas discharge r

Details Document scanning apparatus with photosensor and gas discharge r Document scanning apparatus with photosensor and gas discharge r

1983-04-04

1985-11-05

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, 3151694, H01J 4014

Patent

active

045516227

ABSTRACT:
An arrangement for the line by line scanning of a document has a line array of individual light sensor elements each of which is characterized by a gas discharge chamber limited on one side by a cathode and on the opposite side by photoconductor layer carrying a transparent and a non-transparent signal electrode. The signal electrodes are common to all the sensor elements in the line array, extend parallel to each other, and are connected to a differential amplifier to eliminate switching transients and dark signals from the information signal.

REFERENCES:
patent: 2925530 (1960-02-01), Engelbart
patent: 4079422 (1978-03-01), Anagnostopoulos
patent: 4430564 (1984-02-01), Fischer

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