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US 7,119,968 B2Granted
AF control apparatus
AssigneePENTAX Corporation
InventorsNoboru Saito, Takamitsu Sasaki, Hideyuki Yamamoto
Life of this patent
Estimating the term…
Abstract
An AF control apparatus includes a plurality of movable lens groups, each of which is movable along an optical axis for performing focusing independently, and a driving system for moving each of the movable lens groups. A moving path of each of the movable lens groups during an autofocusing operation is defined so that a ratio of moving distances of the each of the movable lens groups is constant over an entire zoom range.
Claims12
An AF control apparatus comprising:
- a plurality of movable lens groups, each of which is movable along an optical axis for performing focusing independently;
- and
- a driving system for moving each of said movable lens groups, wherein
- a moving path of each of said movable lens groups during an autofocusing operation is defined so that a ratio of moving distances of said each of said movable lens groups is constant over an entire zoom range.
1 more element
An AF control apparatus comprising:
- a plurality of movable lens groups, each of which is movable along an optical axis in accordance with a plurality of zoom steps for performing focusing independently;
- and
- a driving system for moving each of said movable lens groups, wherein
- a moving path of each of said movable lens groups during an autofocusing operation is defined so that a ratio of moving distances of said movable lens groups in each of said zoom steps is a predetermined value defined for said each of said zoom steps.
1 more element
Dependencies are inferred from the claim text.