Error signal producing device having improved linearity

Details Error signal producing device having improved linearity Error signal producing device having improved linearity

1986-08-14

1988-11-08

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 46, G05B 100

Patent

active

047835907

ABSTRACT:
An error signal detecting device is composed of means for irradiating an object with a concentrated light beam, a photosensor having a photoreceptor face divided into plural portions and adapted to receive the light reflected or transmitted by the object, a device for respectively dividing a first output and a second output obtained respectively from the first and second portions of the photoreceptor face of the photosensor, a first comparator for respectively comparing the outputs divided from the first output with the second output, a second comparator for respectively comparing the outputs divided from the second output with the first output, and a device for deriving a positional error signal indicating the positional error of the light beam spot with respect to the surface of the object, at least in one of the direction of optical axis and a direction perpendicular to the optical axis.

REFERENCES:
patent: 3923401 (1975-12-01), Llop et al.
patent: 4152586 (1979-05-01), Elliott et al.
patent: 4652738 (1987-03-01), Nishihara et al.

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