Title:
AUTOMATIC FOCUSING DEVICE
Document Type and Number:
Japanese Patent JP3960647
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To attain sure focusing without causing malfunction by using color aberration of a lens so as to attain a high focus speed.
SOLUTION: This device controls a position of an image pickup lens based on a contrast of a video signal read from an image pickup element 3 resulting from an object image by an image pickup lens 1. In this case, one color signal among a plurality of color signals included in the video signal is used with priority to move the image pickup lens 1 so that the focal position of the color signal appears before a focal plane of the image pickup lens 1 and the focusing is finished by moving the image pickup lens 1 in the same direction by a prescribed distance from the position of the image pickup lens at which the contrast of the one color signal indicates a maximum value.
Inventors:
Kazuya Kobayashi
Application Number:
JP207497A
Publication Date:
August 15, 2007
Filing Date:
January 09, 1997
Export Citation:
Assignee:
Olympus Endo Technology America Inc.
International Classes:
G02B7/36; H04N9/04; G02B7/28; H04N5/232; (IPC1-7): H04N9/04; G02B7/36; G02B7/28; H04N5/232
Domestic Patent References:
| JP7084177A | ||||
| JP6138362A | ||||
| JP3204277A | ||||
| JP1212981A |
Attorney, Agent or Firm:
Takehiko Suzue
Sadao Muramatsu
Tetsuya Kazama
Koji Mizuno
Sadao Muramatsu
Tetsuya Kazama
Koji Mizuno