Title:
【発明の名称】自動焦点調節装置
Document Type and Number:
Japanese Patent JP3136661
Kind Code:
B2
Abstract:
An auto-focusing device for stably drive a photographing lens to track a moving object comprises charge accumulation type-photo-electric conversion means for accumulating charges at a predetermined time interval to produce a focus detection signal, defocus amount calculation means for calculating a defocus amount of the photographing lens based on the focus detection signal, drive distance calculation means for calculating a direction and a distance of the lens drive for driving the photographing lens to track the moving object based on at least the defocus amount, drive means for driving the photographing lens in accordance with the calculated direction and distance of the lens drive, and control means for supplying the direction and distance of the lens drive calculated by the drive distance calculation means to the drive means after the end of the next charge accumulation by the photo-electric conversion means to drive the photographing lens so that the photographing lens tracks the moving object.
Inventors:
Akira Ogasawara
Application Number:
JP17878091A
Publication Date:
February 19, 2001
Filing Date:
June 24, 1991
Export Citation:
Assignee:
NIKON CORPORATION
International Classes:
G02B7/28; G02B7/34; G02B7/36; G03B13/36; (IPC1-7): G02B7/28; G02B7/34; G03B13/36
Domestic Patent References:
| JP1288820A | ||||
| JP1288809A | ||||
| JP63106712A | ||||
| JP60214325A | ||||
| JP229172A | ||||
| JP3249714A |
Attorney, Agent or Firm:
Fuyuki Nagai