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US 6,650,832 B2Granted
Variable power lens barrel and camera
AssigneeCanon Kabushiki Kaisha
InventorShinichi Masuda
Life of this patent
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AssigneeCanon Kabushiki Kaisha
InventorShinichi Masuda
Estimating the term…
The present invention discloses a variable power lens barrel including a first lens unit that is positioned nearest to the subject side, and a cam barrel having the first cam, wherein the first cam alternately and continuously has a plurality of variable power cam portions that drive the first lens unit for varying power thereof in the optical axis direction and a plurality of focus cam portions that drive the first lens unit driven by the respective variable power cam portions for focusing in the optical axis, and an amount of lift of the focus cam portion of the first cam, which drives the first lens unit, in the optical axis direction at the telephoto end is smaller than an amount of lift of the focus cam portion of the first cam, which drives the first lens unit, in the optical axis direction at other variable power positions.
A variable power lens barrel comprising a first lens unit that is positioned nearest to the object side, and a cam barrel having a first cam, wherein the first cam alternately and continuously has a plurality of variable power cam portions that drive said first lens unit for varying power thereof in the optical axis direction and a plurality of focus cam portions that drive said first lens unit driven by the respective variable power cam portions for focusing in the optical axis direction, and an amount of lift of the focus cam portion of said first cam, which drives said first lens unit, in the optical axis direction at the telephoto end is smaller than an amount of lift of the focus cam portion of said first cam, which drives said first lens unit, in the optical axis direction at other variable power positions from the wide angle end to the telephoto end.
Dependencies are inferred from the claim text.