| US 7,518,807 B2 | ||
| Focus adjustment apparatus, image pickup apparatus, and control method | ||
| Yosuke Morimoto, Yokohama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Aug. 28, 2007, as Appl. No. 11/846,415. | ||
| Claims priority of application No. 2006-237588 (JP), filed on Sep. 01, 2006. | ||
| Prior Publication US 2008/0055751 A1, Mar. 06, 2008 | ||
| Int. Cl. G02B 15/14 (2006.01); G02B 7/02 (2006.01); G03B 3/10 (2006.01) | ||
| U.S. Cl. 359—696 [359/698; 359/823; 396/95] | 5 Claims |
| 1. A focus adjustment apparatus comprising:
a moving unit configured to move a focusing lens;
a focus adjusting unit configured to perform focus adjustment by moving the focusing lens such that the sharpness of an image
obtained from an image pickup unit is increased; and
an in-focus position measuring unit configured to measure an in-focus position in a different manner from the focus adjusting
unit,
wherein the focus adjusting unit moves the focusing lens in the direction of the in-focus position measured by the in-focus
position measuring unit when the direction of movement of the focusing lens in which image sharpness is increased is matched
with the direction of the current position of the focusing lens relative to the in-focus position measured by the in-focus
position measuring unit, and either does not move the focusing lens in the direction of the in-focus position measured by
the in-focus position measuring means, or does not move the lens all the way to the in-focus position measured by the in-focus
position measuring means, when both directions are not matched with each other.
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