Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-12-11
1981-02-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
3581281, G01J 120
Patent
active
042530199
ABSTRACT:
An apparatus is described for reading a record carrier with an optical radiation-reflecting information structure. The path of the read beam includes a plane-parallel plate, whose surface area is substantially smaller than the cross-sectional area of the read beam, which plate ensures that the beam portion which passes through the plate cannot interfere with the rest of the read beam. After reflection by the record carrier the said beam portion passes through the radiation-deflecting element which deflects the beam portion to two radiation-sensitive detectors. The position of the radiation spot formed by the said beam portion is proportional to the degree of focussing of the read beam on the information structure.
REFERENCES:
patent: 3971002 (1976-07-01), Bricot et al.
patent: 4135207 (1979-01-01), Greve et al.
patent: 4143402 (1979-03-01), Bricot et al.
Opheij Willem G.
van der Werf Jan E.
Briody Thomas A.
Nelms David C.
Streeter William J.
Tamoshunas Algy
U.S. Philips Corporation
LandOfFree
Apparatus for reading an optical record carrier having a radiati does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Apparatus for reading an optical record carrier having a radiati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Apparatus for reading an optical record carrier having a radiati will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1410956