Focus error detector

Details Focus error detector Focus error detector

1985-03-04

1987-09-22

Evans, F. L.

Optics: measuring and testing

Focal position of light source

250201, 369 45, G01J 136

Patent

active

046951580

ABSTRACT:
A focus error detector comprises an inner group of light detector elements formed in a circular area about a focus point of an illumination beam for generating a first focus error signal. A second group of light detector elements formed in an annular-shaped area around the circular area for generating a second focus error signal, an amplifier for amplifying the second error signal, and an adder for combining the first and second focus error signals to generate a composite focus error signal.

REFERENCES:
patent: 4152586 (1979-05-01), Elliott et al.
patent: 4546460 (1985-10-01), Ando

Affiliated with

Also associated with

Rating

Focus error detector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Focus error detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus error detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2055461