Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-09-29
1980-09-02
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 136
Patent
active
042208505
ABSTRACT:
A bimodal automatic lens focussing apparatus including detection and switching means for detecting a loss in a localized focal condition and switching to a search mode wherein the objective lens is scanned between its outer limits to reacquire focus. Photodiode arrays sense respective light images on either side of the desired focal plane, and the resulting signals are processed to drive the lens to the desired focal plane. A level discriminator monitors the processed signals. Upon detection of a loss of the localized focus condition a mode switch is gated to couple a ramp generator to the lens driver. The lens is scanned between its outer limits until the level discriminator again detects the localized focus condition and the ramp generator is decoupled from the lens driver.
REFERENCES:
patent: 3851156 (1974-11-01), Green
patent: 3967110 (1976-06-01), Rogers et al.
patent: 3970841 (1976-07-01), Green
patent: 3999047 (1976-12-01), Green
patent: 4061914 (1977-12-01), Green
Reticon RL-64p Solid State Line Scanner.
Abbott Laboratories
Hostetter Darwin R.
McDonnell John J.
Nelms David C.
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