Photoelectric type displacement detection apparatus

Details Photoelectric type displacement detection apparatus Photoelectric type displacement detection apparatus

1984-12-13

1987-01-13

LaRoche, Eugene R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250237G, H01J 4014

Patent

active

046366300

ABSTRACT:
A photoelectric type displacement detecting apparatus, such as a digital display dial gauge micrometer, with an improved frequency response, comprising optical lattice means, light emitting means for irradiating the optical lattice means with a detecting light, light receiving means for receiving a transmission or reflective light from the optical lattice means, and a detection circuit for generating an output signal indicative of relative movement in the lattice. The frequency characteristic of a phototransistor adapted in the light receiving means depends on the input impedance of a base-grounded transistor to maintain the current supplied to the light emitting means constant and to improve the frequency response in the detection apparatus.

REFERENCES:
patent: 4310755 (1982-01-01), Miller

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