Photography – Having variable focal length of camera objective – Power zoom
Reexamination Certificate
2005-10-04
2009-10-13
Koval, Melissa J. (Department: 2862)
Photography
Having variable focal length of camera objective
Power zoom
C396S079000, C396S085000, C396S101000, C396S121000, C396S529000, C359S694000, C359S699000, C359S700000, C359S701000
Reexamination Certificate
active
07603030
ABSTRACT:
An optical apparatus includes a zoom optical system including a focusing lens unit, a first cam member that rotates around the optical axis and moves along the optical axis in a magnification-changing operation, the first cam member including a focus cam portion for driving the focusing lens unit, and a speed-changing mechanism that changes the relative rotational speed between the focusing lens unit and the first cam member in accordance with the focal length of the zoom optical system in the magnification-changing operation. The speed-changing mechanism moves along the optical axis in the magnification-changing operation. In addition, the speed-changing mechanism includes a transmission member that is rotatable around the optical axis with respect to the first cam member and that includes a speed-changing cam portion for changing at least one of the rotational speed and the rotational direction of the focusing lens unit.
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Canon Kabushiki Kaisha
Canon U.S.A. Inc. I.P. Division
Koval Melissa J.
Smith Linda B
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