Variable focal lens and imaging apparatus

Details Variable focal lens and imaging apparatus Variable focal lens and imaging apparatus

2007-03-16

2011-11-29

Pinkney, Dawayne (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S382000, C396S079000, C355S055000

Reexamination Certificate

active

08068286

ABSTRACT:
A variable focal lens which does not require a reduction of a zoom factor and eliminates an origin sensor is provided. A microcomputer15functions as a focus adjustment section which controls a stepper motor13to move a focusing ring5for a focus adjustment. The microcomputer15causes the focusing ring5to move by a first moving distance in a first moving direction toward one of a FAR side and a NEAR side, and then to move the focusing ring5by a second moving distance in a second moving direction opposite to the first moving direction, and set the point where the focusing ring reaches after the movement in the second moving direction as a reference point for adjustment, and the microcomputer15causes the focusing ring5to move from the reference point for adjustment in the first moving direction within a range equal to or less than the second moving distance to carry out the focus adjustment. This configuration eliminates margins provided by software at ends of the movement range of the focusing ring5.

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