Wand turn-on control

Details Wand turn-on control Wand turn-on control

1976-10-04

1978-02-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250568, H01J 3912

Patent

active

040728595

ABSTRACT:
Disclosed is a control circuit used to conserve power in a portable optical recognition system. When the system is not being used or between actual scans of the reading electronics, power is supplied only to those circuits required to control power to the system and to permit sequence reading of items. An infrared signal is emitted from the reading device and when a document or other item to be read is scanned the infrared signal is reflected back into the scan unit and is detected, thereby sensing that a document is being read and turning the system on.

REFERENCES:
patent: 3946241 (1976-03-01), Malinowski
patent: 3970846 (1976-07-01), Schofield et al.
patent: 4009389 (1977-02-01), Lindholm
patent: 4029957 (1977-06-01), Betz et al.

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