Method and apparatus for visual indication of optical alignment

Details Method and apparatus for visual indication of optical alignment Method and apparatus for visual indication of optical alignment

1989-08-15

1990-07-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250221, 356152, H01J 4014

Patent

active

049408895

ABSTRACT:
An alignment system for photoelectric switch includes a variable frequency oscillator producing a frequency which varies according to a light reception signal from a light receiving element in the photoelectric switch. A light emitting device is energized by the output of the variable frequency oscillator to give a visual indication of alignment. A threshold compares the amplitude of the light reception signal with a preset voltage. When the light reception signal exceeds the preset voltage, a logic element provide steady illumination of the light emitting device as an indication that alignment is completed. A lower threshold is then applied to the threshold to keep the light emitting device steadily illuminated until misalignment or propagation conditions reduce the amount of light received.

REFERENCES:
patent: 3532892 (1970-10-01), Murphy
patent: 4310756 (1982-01-01), Sick et al.

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