Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-02-04
1994-01-25
Messinger, Michael
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369 4442, G01J 120, G11B 700
Patent
active
052818020
ABSTRACT:
A focus error signal detection device comprising an optical system for guiding a reflection beam reflected from an optical information recording medium to a photo-detection system side. A beam dividing system is arranged for dividing the reflection beam to two beams. Two photo-detecting units are arranged for detecting the two divided beams, respectively, each unit having light receiving surfaces arranged on a same plane. A beam position adjusting system is arranged for adjusting optical axes of the two divided beams with respect to predetermined positions of the photo-detecting units by simultaneously moving the two detecting units with respect to the beam dividing system.
REFERENCES:
patent: 4533826 (1985-08-01), Van Alem
patent: 4612437 (1986-09-01), Ohsato
patent: 4724533 (1988-02-01), Ohara et al.
patent: 4801794 (1989-01-01), Kowalski et al.
patent: 4870632 (1989-09-01), Shiono et al.
patent: 5015835 (1991-05-01), Ohuchida et al.
patent: 5101389 (1992-03-01), Ohuchida et al.
patent: 5151887 (1992-09-01), Miyazaki
patent: 5161139 (1992-11-01), Inoue et al.
Messinger Michael
Ricoh & Company, Ltd.
LandOfFree
Focus error signal detection device with separating prism 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 signal detection device with separating prism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Focus error signal detection device with separating prism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-729611