Power-driven focusing apparatus
AssigneeNikon Corporation
InventorYoshiharu Shiokama
Life of this patent
Estimating the term…
Abstract
A photographing apparatus for electrically detecting manipulation of a manually manipulated member and driving a photographing lens into an in-focus state by driving a motor in accordance with the manipulation comprises a continuous drive device for driving the lens by driving the motor for a time corresponding to a manipulation time when the manual manipulation member is continuously manipulated longer than a predetermined time, and a fine drive device for driving the motor to drive the lens by a predetermined amount per manipulation which is independent from the manipulation time and variable in accordance with a photographing condition when the manual manipulation member is manipulated shorter than the predetermined time.
Claims24
In a photographing apparatus for electrically detecting manipulation of a manual manipulation member and driving a photographing lens into an in-focus state by driving a motor in accordance with the manipulation,
- a power-driven focusing device comprising:
- continuous drive means for driving the lens by driving the motor for a time corresponding to the manipulation time when said manual manipulation member is continuously manipulated longer than a predetermined time;
- and
- fine drive means for driving the motor to drive the lens by a predetermined amount per manipulation which is independent from the manipulation time and variable in accordance with a photographing condition when said manual manipulation member is manipulated shorter than the predetermined time.
A photographing method in which a manual manipulation member is manipulated and a photographing lens is driven into an in-focus state by driving a motor in accordance with the manipulation, comprising:
- driving the lens by driving the motor for a time corresponding to a manipulation time of said member when said member is continuously manipulated for a time longer than a predetermined time;
- and
- driving the motor to drive the lens by a predetermined lens drive amount per manipulation of said member which is independent from the manipulation time and variable in accordance with a photographing condition when said member is manipulated for a time shorter than the predetermined time.
Dependencies are inferred from the claim text.