| US 7,577,349 B2 | ||
| Focus detecting device and camera system using the same device | ||
| Daisuke Inoue, Ebina (Japan); and Hidekazu Takahashi, Zama (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Aug. 07, 2006, as Appl. No. 11/499,719. | ||
| Claims priority of application No. 2005-251656 (JP), filed on Aug. 31, 2005. | ||
| Prior Publication US 2007/0047939 A1, Mar. 01, 2007 | ||
| Int. Cl. G03B 7/28 (2006.01) | ||
| U.S. Cl. 396—111 [348/345; 348/350] | 5 Claims |
| 1. A phase difference detection type focus detecting device comprising:
a first sensor group having a plurality of photoelectric conversion elements, the first sensor group functioning as a standard
portion for phase difference detection;
a second sensor group having a plurality of photoelectric conversion elements, the second sensor group being paired with the
first sensor group and functioning as a reference portion for phase difference detection;
a third sensor group having a plurality of photoelectric conversion elements, the third sensor group functioning as a standard
portion for phase difference detection; and
a fourth sensor group having a plurality of photoelectric conversion elements, the fourth sensor group being paired with the
third sensor group and functioning as a reference portion for phase difference detection,
wherein each photoreceiving area of the third and fourth sensor groups is larger than each photoreceiving area of the first
and second sensor groups.
|