| US 7,577,350 B2 | ||
| Lens apparatus and imaging apparatus | ||
| Tomoyuki Nakamura, Utsunomiya (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Mar. 22, 2007, as Appl. No. 11/689,985. | ||
| Claims priority of application No. 2006-097363 (JP), filed on Mar. 31, 2006. | ||
| Prior Publication US 2007/0230934 A1, Oct. 04, 2007 | ||
| Int. Cl. G03B 17/00 (2006.01); G02B 7/28 (2006.01) | ||
| U.S. Cl. 396—111 [396/80] | 6 Claims |
| 1. A lens apparatus configured to be mountable on a camera body including an image sensor, the lens apparatus comprising:
a first focus lens unit;
a splitting optical unit disposed between the first focus lens unit and the image sensor;
a second focus lens unit disposed between the splitting optical unit and the image sensor along the optical axis, the second
focus lens unit being movable from an initial position along the optical axis to vary the focusing state;
a focusing state detection unit configured to detect the focusing state using a light flux from the splitting optical unit;
an actuator configured to drive the first focus lens unit; and
a controller configured to control driving of the actuator according to an output from the focusing state detection unit,
wherein the controller stops driving of the actuator if the second focus lens unit is located at a position different from
the initial position.
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