JPH03223708A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPH03223708A
JPH03223708A JP1987590A JP1987590A JPH03223708A JP H03223708 A JPH03223708 A JP H03223708A JP 1987590 A JP1987590 A JP 1987590A JP 1987590 A JP1987590 A JP 1987590A JP H03223708 A JPH03223708 A JP H03223708A
Authority
JP
Japan
Prior art keywords
defocusing
subject
areas
lens
focus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1987590A
Other languages
Japanese (ja)
Inventor
Tokuji Ishida
Hiroshi Otsuka
Hiroshi Ueda
Original Assignee
Minolta Camera Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minolta Camera Co Ltd filed Critical Minolta Camera Co Ltd
Priority to JP1987590A priority Critical patent/JPH03223708A/en
Publication of JPH03223708A publication Critical patent/JPH03223708A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To attain focus detection with high reliability by selecting a specific area where the probability of the presence of a subject is high among plural areas, calculating a difference in defocusing quantity, and determining the quantity of defocusing of a subject field.
CONSTITUTION: The specific area where the probability of the presence of the subject is high is selected among plural areas, the difference in the defocusing quantity is calculated, and the defocusing quantity of the subject field is determined. Namely, a lens circuit 12 in an interchangeable lens outputs a photographic distance DV corresponding to the focus position of a photographic lens and a focus detecting circuit 13 outputs sensor data to a microcomputer 10 so as to detects the focuses of four areas in the subject field. An exposure arithmetic circuit 15 outputs a control aperture value to the microcomputer and a lens driving circuit 14 drives the photographic lens according to the calculated quantity. Thus, the defocusing quantity of the subject field is determined according to the defocusing quantities of the areas and the defocusing quantities of other areas. Consequently, the accuracy of focus adjustment is improved.
COPYRIGHT: (C)1991,JPO&Japio
JP1987590A 1990-01-29 1990-01-29 Focus detector Pending JPH03223708A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987590A JPH03223708A (en) 1990-01-29 1990-01-29 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987590A JPH03223708A (en) 1990-01-29 1990-01-29 Focus detector

Publications (1)

Publication Number Publication Date
JPH03223708A true JPH03223708A (en) 1991-10-02

Family

ID=12011384

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987590A Pending JPH03223708A (en) 1990-01-29 1990-01-29 Focus detector

Country Status (1)

Country Link
JP (1) JPH03223708A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012137674A (en) * 2010-12-27 2012-07-19 Canon Inc Focus detector and imaging apparatus with the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012137674A (en) * 2010-12-27 2012-07-19 Canon Inc Focus detector and imaging apparatus with the same

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