| US 7,570,441 B2 | ||
| Lens drive apparatus, lens system and lens-operation restricting apparatus | ||
| Takeshi Idemura, Saitama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jul. 24, 2007, as Appl. No. 11/782,512. | ||
| Claims priority of application No. 2006-206102 (JP), filed on Jul. 28, 2006. | ||
| Prior Publication US 2008/0024889 A1, Jan. 31, 2008 | ||
| Int. Cl. G02B 7/02 (2006.01) | ||
| U.S. Cl. 359—819 [359/823] | 6 Claims |
| 1. A lens drive apparatus which electrically drives an operation member provided in a lens apparatus and allows manual operation
of the operation member, comprising:
an electric driving switch which is operated to instruct electric drive of the operation member;
a motor which generates power to electrically drive the operation member;
a clutch provided in a power transmission path from the motor to the operation member;
a position detector which detects the position of the operation member;
a range setter which sets a permissible movement range of the operation member; and
a controller which controls the motor and the clutch in response to the operation of the electric driving switch,
wherein, in a case where the detected position by the position detector changes from the inside of the permissible movement
range to the outside thereof in a non-motor-driven state where the electric driving switch is not operated, the controller
controls the clutch so that a load on the movement of the operation member is increased in comparison with a case where the
detected position is within the permissible movement range.
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