Bimodal autofocusing apparatus

Details Bimodal autofocusing apparatus Bimodal autofocusing apparatus

G - Physics

02

B

88/94.5

G02B 21/24 (2006.01)

Patent

CA 1125068

Canada #3551 A B S T R A C T A bimodal automatic lens focussing apparatus in- cluding 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 respec- tive 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.

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