Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1997-08-27
2000-07-11
Allen, Stephone B.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
369100, G02B 704, G11B 700
Patent
active
060876441
ABSTRACT:
A system for focus capture wherein a lens is initially retracted to the bottom of its stroke, moved up to the top of its stroke while looking for the maximum Quad Sum signal, then moved back away from the disc while the system looks for the total light coming back from the disc to be above one-half of the peak value it measured, searching for the first zero crossing and, after the Quad Sum is over one-half amplitude, closing focus.
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Allen Stephone B.
Bollella Donald
Discovision Associates
Wenskay Donald L.
LandOfFree
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