Photoelectric information and focus detector

Details Photoelectric information and focus detector Photoelectric information and focus detector

1981-06-30

1984-08-07

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 136

Patent

active

044645678

ABSTRACT:
Apparatus for reading information stored in a track pattern on a radiation reflecting record comprises a source of radiation such as a laser, a diffraction grating for providing at least a zero order beam component and a pair of first order beam components, an objective lens assembly, a photodetector array, the photodetector array comprising a unitary data photodetector disposed for impingement of the zero order beam component for sensing stored information and at least first and second paired photodetector arrays adjacent to the data photodetector including separated sectors disposed along an axis including the data photodetector for providing at least focus error correction signals to the objective lens assembly, and means provided in the optical path between the objective lens assembly and the photodetector array for providing a first portion of the reading beam components which remains relatively fixed in size and a second portion of the reading beam components which varies substantially linearly in size as the record deviates from a plane of focus.

REFERENCES:
patent: 3913076 (1975-10-01), Lehureau et al.
patent: 4006293 (1977-02-01), Bouwhuis et al.
patent: 4363116 (1982-12-01), Kleuters et al.

Affiliated with

Also associated with

Rating

Photoelectric information and focus 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 Photoelectric information and focus detector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Photoelectric information and focus detector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-604742