Alignment indicator for photoelectric scanners
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United States of America Patent
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-
Oct 26, 1982
Grant Date -
N/A
app pub date -
May 29, 1980
filing date -
May 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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