Alignment indicator for photoelectric scanners

Details Alignment indicator for photoelectric scanners Alignment indicator for photoelectric scanners

1980-05-29

1982-10-26

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250221, H01J 4014

Patent

active

043563937

ABSTRACT:
A photoelectric scanner system includes photosensors (10), an amplifier (15), and a demodulator (17), and functions to produce an output signal indicative of when light signals of a predetermined intensity are being received by the photosensors. An alignment indicator control circuit (20) is connected to receive the amplified light intensity signals, and functions to produce a repetitive alignment indicating signal whose frequency is generally proportional to the intensity of the received light signal. The signals are applied to an alignment indicator which, in the preferred embodiment, is a light emitting diode, so that the LED flashes at a frequency indicative of the degree of alignment of the system, enabling an operator to accurately align the photoelectric scanning system with reference to the flash rate of the alignment indicator.

REFERENCES:
patent: 3846028 (1974-11-01), List
patent: 3883252 (1975-05-01), Ando
patent: 3909137 (1975-09-01), Kisanuki
patent: 3924251 (1975-12-01), Crask
patent: 3932746 (1976-01-01), Swanson
patent: 3995959 (1976-12-01), Shaber
patent: 4013886 (1977-03-01), Schmid
patent: 4061431 (1977-12-01), Toyoda

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