Optical: systems and elements – Lens – With variable magnification
Reexamination Certificate
2006-06-06
2009-11-10
Hasan, Mohammed (Department: 2873)
Optical: systems and elements
Lens
With variable magnification
C359S824000, C396S131000
Reexamination Certificate
active
07616387
ABSTRACT:
A control section acquires a stop target position where a stop target lens should be stopped from a zoom tracing table according to zoom operation. Next, a motor driver is controlled to drive a DC motor of a lens unit. Comparison is made between a current state and a target deceleration curve. When the stop target lens reaches a deceleration start position, deceleration is made along the target deceleration curve by increasing or decreasing an ON ratio of PWM drive and a voltage applied according to deviance from the target deceleration curve. When the stop target lens reaches a complete stop processing start position, the motor driver is controlled to stop the stop target lens at the stop target position. Thereby, a zoom lens and a focus lens can be moved more precisely and speedily to the target position.
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patent: 6301441 (2001-10-01), Kato
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Casio Computer Co. Ltd.
Frishauf Holtz Goodman & Chick P.C.
Hasan Mohammed
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