Title:
【発明の名称】自動焦点検出装置
Document Type and Number:
Japanese Patent JP3362928
Kind Code:
B2
Abstract:
PURPOSE:To realize a focusing operation short in focusing time and high in focusing accuracy even if there are plural maximal points in a contrast characteristic. CONSTITUTION:This automatic focusing detector is constituted to have an imaging optical system which takes in the light image of a subject S placed on a stage 1 via an objective lens 3 and image a subject image, an image sensor 6 which reads the front focus image and rear focus image formed in the front and rear positions optically conjugate with the predetermined imaging plane of this imaging optical system, a contrast calculating means 12 which calculates a contrast value in accordance with an evaluation function from the respective image signals of the front focus image and the rear focus image from this image sensor 6, a contrast comparing means which compares the contrast value of the front focus image and the contrast value of the rear focus image, a image shape comparing means 8 which compares the shapes of the front focus image and rear focus image formed on the image sensor 6 and a driving control means which controls a driving direction and driving quantity in accordance with the respective results of the comparison.
Inventors:
Takashi Yoneyama
Hiroyuki Nishida
Hiroyuki Nishida
Application Number:
JP24912293A
Publication Date:
January 07, 2003
Filing Date:
October 05, 1993
Export Citation:
Assignee:
Olympus Optical Co., Ltd.
International Classes:
G02B7/36; G02B7/28; G02B21/00; H04N5/232; (IPC1-7): G02B7/36; G02B7/28; G02B21/00; H04N5/232
Domestic Patent References:
| JP6442616A | ||||
| JP595214A | ||||
| JP597320A | ||||
| JP4145406A | ||||
| JP61235808A | ||||
| JP1122274A | ||||
| JP546531A | ||||
| JP456915A | ||||
| JP5917516A |
Attorney, Agent or Firm:
Takehiko Suzue