Device for detecting focussing error in an optical reader head

Details Device for detecting focussing error in an optical reader head Device for detecting focussing error in an optical reader head

G - Physics

11

B

352/32.21

G11B 7/00 (2006.01) G01J 1/20 (2006.01) G02B 7/34 (2006.01) G11B 7/09 (2006.01)

Patent

CA 1056950

ABSTRACT OF THE DISCLOSURE : A device for detecting the error in focussing a read- out beam on the impression. Two photodetector cells located respectively in front of and behind the optical axis of the system, in relation to the direction of transfer, produce two electrical signals the difference between which is the read- out signal, a control signal being obtained by a comparison of the phases of the two signals, one of which is phase-shifted so that the optimum focussing point corresponds to zero phase- shift.

232166

Affiliated with

Also associated with

Rating

Device for detecting focussing error in an optical reader head does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for detecting focussing error in an optical reader head, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for detecting focussing error in an optical reader head will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-929145