Original document reading apparatus

Details Original document reading apparatus Original document reading apparatus

1978-09-27

1980-09-23

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250578, 313103CM, H01J 3912

Patent

active

042245109

ABSTRACT:
An original document reading apparatus has a photocathode on which an image of an original document is focused. An array of secondary electron multipliers are arranged for multiplying the photoelectrons emitted from the photocathode. A plurality of anodes face the secondary electron multipliers, and capacitors are connected between the respective anodes and ground. A common load resistor is connected to the respective anodes through series circuits each including two electronic switch arrays. A scanning circuit is used for opening and closing the series connected switches to sequentially connect the common load resistor to the anodes to scan them. An amplifier circuit is used for amplifying the output which is generated in the common load resistor. The first of the electronic switch arrays are separated into n groups so that control is effected for every group and the drain terminals of the corresponding first described switches in the groups are commonly connected to the source terminals of the second electronic switch array thereby reducing the required number of the electronic switches.

REFERENCES:
patent: 3887810 (1975-06-01), Skaggs
patent: 4119852 (1978-10-01), Rougeot

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