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JPS5564218A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS5564218A
JPS5564218A JP13694378A JP13694378A JPS5564218A JP S5564218 A JPS5564218 A JP S5564218A JP 13694378 A JP13694378 A JP 13694378A JP 13694378 A JP13694378 A JP 13694378A JP S5564218 A JPS5564218 A JP S5564218A
Authority
JP
Japan
Prior art keywords
photo detector
obtains
picture
operating part
detector groups
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
JP13694378A
Other languages
Japanese (ja)
Inventor
Nobuo Hatsutori
Hisatsune Tsuda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Olympus Corp
Original Assignee
Olympus Optical 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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP13694378A priority Critical patent/JPS5564218A/en
Publication of JPS5564218A publication Critical patent/JPS5564218A/en
Pending legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To enable focus to be detected at the arbitrary portions in the field of view of the photographing optical system by providing the means of selecting one out of the plural photo detector groups disposed on the imaging plane so as to receive the respectively different portions of the images.
CONSTITUTION: Respective photo detector groups 3aW3e are disposed on the imaging plane of a photographing optical system 1 for detecting foucs and receive respectively different images. The photo detector groups 3aW3e are selected by a select switch 5 and the illuminance signal of the selected photo detector group is supplied to a picture-element-distributing part 6. The picture-element-distributing part 6 fetches out the illuminances xn-1, xn, xn+1 of the three adjoining picture elements with respect to the respective picture elements and parallel supplies these subsequently to a local illuminance operating part 7. The local illuminance operating part obtains |Xn of the second order difference of the illuminances about xn and similarly obtains Xn for each n. A cumulation operating part 8 obtains the sum Y with respect to the Xn being inputted. The position where the value of Y becomes maximum may be detected as focus.
COPYRIGHT: (C)1980,JPO&Japio
JP13694378A 1978-11-07 1978-11-07 Focus detector Pending JPS5564218A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13694378A JPS5564218A (en) 1978-11-07 1978-11-07 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13694378A JPS5564218A (en) 1978-11-07 1978-11-07 Focus detector

Publications (1)

Publication Number Publication Date
JPS5564218A true JPS5564218A (en) 1980-05-14

Family

ID=15187148

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13694378A Pending JPS5564218A (en) 1978-11-07 1978-11-07 Focus detector

Country Status (1)

Country Link
JP (1) JPS5564218A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57161708A (en) * 1981-03-28 1982-10-05 Olympus Optical Co Ltd Focusing detector having variable visual field of detection
JPS5934504A (en) * 1982-08-20 1984-02-24 Sony Corp Autofocusing device
JPS59107685A (en) * 1982-12-10 1984-06-21 Sanyo Electric Co Ltd Setting circuit of focus control area
JPS6219823A (en) * 1985-07-18 1987-01-28 Koshina:Kk Focusing device
JPS62156608A (en) * 1986-10-18 1987-07-11 Koshina:Kk Focusing device
JPS62180315A (en) * 1986-02-04 1987-08-07 Minolta Camera Co Ltd Focus detecting device
DE3803305A1 (en) * 1987-02-04 1988-08-18 Asahi Optical Co Ltd Device for automatically determining the focusing of a photographic camera

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57161708A (en) * 1981-03-28 1982-10-05 Olympus Optical Co Ltd Focusing detector having variable visual field of detection
JPH0368362B2 (en) * 1981-03-28 1991-10-28 Olympus Optical Co
JPS5934504A (en) * 1982-08-20 1984-02-24 Sony Corp Autofocusing device
JPH0473563B2 (en) * 1982-08-20 1992-11-24
JPS59107685A (en) * 1982-12-10 1984-06-21 Sanyo Electric Co Ltd Setting circuit of focus control area
JPH029509B2 (en) * 1982-12-10 1990-03-02 Sanyo Electric Co
JPS6219823A (en) * 1985-07-18 1987-01-28 Koshina:Kk Focusing device
JPS62180315A (en) * 1986-02-04 1987-08-07 Minolta Camera Co Ltd Focus detecting device
JPH06100717B2 (en) * 1986-02-04 1994-12-12 ミノルタ株式会社 Focus detection device
JPS62156608A (en) * 1986-10-18 1987-07-11 Koshina:Kk Focusing device
DE3803305A1 (en) * 1987-02-04 1988-08-18 Asahi Optical Co Ltd Device for automatically determining the focusing of a photographic camera
DE3803305C3 (en) * 1987-02-04 1998-12-10 Asahi Optical Co Ltd Device for detecting the focusing of a camera lens

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