| US 7,570,879 B2 | ||
| Image sensing apparatus, control method therefor, and automatic focus adjusting device for image sensing apparatus | ||
| Hiroto Okawara, Ibaraki-ken (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Jul. 18, 2005, as Appl. No. 11/184,281. | ||
| Claims priority of application No. 2004-217774 (JP), filed on Jul. 26, 2004. | ||
| Prior Publication US 2006/0018649 A1, Jan. 26, 2006 | ||
| Int. Cl. G03B 17/00 (2006.01) | ||
| U.S. Cl. 396—77 [396/79; 396/80; 396/91; 396/93; 382/255] | 7 Claims |
| 1. An image sensing apparatus which can exchange a lens unit which includes a control unit for determining a driving direction
in which a focus lens of an optical system is driven to a focused focal point and determining a driving speed on the basis
of an increase/decrease in level of a sign of an AF evaluate value output from said image sensing apparatus and a driving
unit for driving the focusing lens on the basis of the determination of said control unit, said apparatus comprising:
an extraction unit configured to extract one or a plurality of focus signals in one or a plurality of focus detection areas
within a frame from an image sensing signal output from an image sensing unit; and
a transmitting unit configured to transmit to said lens unit said signals extracted by said extraction unit, as the AF evaluate
value;
wherein an extraction characteristic of said extraction unit is changed in accordance with a type of said lens unit, and
wherein when the focusing lens is driven in one direction to change a focusing state from a blurring state to a blurring state
through a focused state, the extraction characteristic of said extraction means is changed, in an increasing/decreasing curve
shape plotted by a focus signal level which changes in accordance with a focusing state, so as to change a sharpness of the
increasing/decreasing curve shape.
|