Positioning servo-mechanism or tachometer employing self-scannin

Details Positioning servo-mechanism or tachometer employing self-scannin Positioning servo-mechanism or tachometer employing self-scannin

1981-12-28

1984-05-15

Dobeck, B.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318480, 250237R, G05B 106

Patent

active

044490844

ABSTRACT:
Apparatus for precise positioning of a movable stage such as a microscope stage including a light source and a self-scanning array of photodiodes for receiving light from the light source. An opaque shade is adapted to be moved with the shade and block at least a portion of the light which otherwise would impinge on the self-scanning photodiode array. The self-scanning photodiode array is adapted to emit an electrical signal proportional to the number of photodiodes on which light impinges. A digital comparator is adapted receive this signal in digitized form and compare the same with a positioning program digital input. In the event of a difference a responsive signal is emitted to a bi-directional motor drive which effects corrective movement of the stage. The apparatus may also function as a tachometer.

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