Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-06-15
1993-09-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 4414, G01J 120
Patent
active
052471659
ABSTRACT:
A displacement detecting apparatus comprises a non-contacting sensor for detecting a displacement of a measured surface, a linear scale unitarily attached to the non-contacting sensor through a coupling member, a graduation read-out device for reading out a graduation of the linear scale, an actuator for moving the non-contacting sensor and the linear scale, and a servo control circuit for driving the actuator, wherein the linear scale and the non-contacting sensor are moved by the actuator in unison with each other. Thus, the displacement of the measured surface can be detected with high accuracy.
REFERENCES:
patent: 4148587 (1979-04-01), Erdmann et al.
patent: 4492856 (1985-01-01), Kimura
Hiruta Akitaka
Taniguchi Kayoko
Yukawa Takao
Allen Stephone
Eslinger Lewis H.
Maioli Jay H.
Nelms David C.
Sony Corporation
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