G - Physics – 11 – B
Patent
G - Physics
11
B
352/32.21
G11B 7/00 (2006.01) G11B 7/09 (2006.01)
Patent
CA 1120152
ABSTRACT This invention relates generally to radiant beam focusing arrangements. Many prior art systems depend upon mechanical moving parts between the objective lens and the information detector. Such systems introduce delays which may materially affect the response time and other desired effici- encies in the movement of whatever element which will re-estab- lish the desired focus. Also, many such focusing systems are very sensitive to tracking errors. The present invention over- comes these difficulties by providing an optical transducer having concentric radiant beam detectors for converting a radiant beam to electrical signals including a first axially placed detector with a second detector concentric therewith, in one embodiment, the detectors receive the radiant beam through an amplifying auxiliary lens. Changes in focus differentially affect the magnitude of the beam impinging on the individual de- tectors, resulting in corresponding changes in the individual detector outputs. A focusing system employing the transducer moves a focusing lens in response to the differential output of the individual detectors. An electrical difference circuit leading from the photo-detectors generates a driving signal to energize a lens-moving motor for shifting the focusing lens along the axis of the beam.
304747
Elliott James E.
Mickelson Lee
Discovision Associates
Gowling Lafleur Henderson Llp
LandOfFree
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