JPS5678811A - Automatic focus controlling device - Google Patents

Automatic focus controlling device

Info

Publication number
JPS5678811A
JPS5678811A JP15665979A JP15665979A JPS5678811A JP S5678811 A JPS5678811 A JP S5678811A JP 15665979 A JP15665979 A JP 15665979A JP 15665979 A JP15665979 A JP 15665979A JP S5678811 A JPS5678811 A JP S5678811A
Authority
JP
Japan
Prior art keywords
series
outputs
range finding
range
wbn
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
JP15665979A
Other languages
Japanese (ja)
Inventor
Kunihiko Araki
Akira Takahashi
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP15665979A priority Critical patent/JPS5678811A/en
Publication of JPS5678811A publication Critical patent/JPS5678811A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To enhance the range finding precision, by obtaining defocus signals by plural range finders and by driving a lens by the intermediate value of them.
CONSTITUTION: In case that the focus is in an arbitrary position, phase slip (j) is obtained by outputs of photoelectric element groups A1WAn and B1WBn as follows; outputs α1Wαn of photoelectric elements A1WAn of the A group and outputs b1Wbn of photoelectric elements B1WBn of the B group are stored in a pair of memories as series, and one series is shifted for the other series to examine their correlation degree. The correlation degree between these series is obtained by expression Ya=Σ((ai-bi)q or YB=Σ[(ai-bi+1)p-(ai+1- bi)p]. Though defocus signals corresponding to p=1, 2, 3...j' are fluctuated in a certain range (indicated oblique lines) due to variance of the operating part and so on, the generation frequency becomes maximum in the intermediate part and is proportional to lens leading-out quantity (e). Thus, the range finding precision can be enhanced by taking the intermediate value of repetitive signals of range finding.
COPYRIGHT: (C)1981,JPO&Japio
JP15665979A 1979-12-03 1979-12-03 Automatic focus controlling device Pending JPS5678811A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15665979A JPS5678811A (en) 1979-12-03 1979-12-03 Automatic focus controlling device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15665979A JPS5678811A (en) 1979-12-03 1979-12-03 Automatic focus controlling device

Publications (1)

Publication Number Publication Date
JPS5678811A true JPS5678811A (en) 1981-06-29

Family

ID=15632484

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15665979A Pending JPS5678811A (en) 1979-12-03 1979-12-03 Automatic focus controlling device

Country Status (1)

Country Link
JP (1) JPS5678811A (en)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101128A (en) * 1980-01-14 1981-08-13 Minolta Camera Co Ltd Automatic focus adjusting camera
JPS57128307A (en) * 1981-02-03 1982-08-09 Nippon Kogaku Kk <Nikon> Automatic focus adjuster
JPS5852607A (en) * 1981-09-24 1983-03-28 Nippon Kogaku Kk <Nikon> Automatic focusing device
JPS58198009A (en) * 1982-05-14 1983-11-17 West Electric Co Ltd Ultrasonic auto-focusing device
US4492448A (en) * 1981-10-02 1985-01-08 Minolta Camera Kabushiki Kaisha Automatic focusing device for use in a camera
JPS6127107U (en) * 1984-07-23 1986-02-18 ライトロン株式会社 auto focus device
US4575212A (en) * 1982-12-28 1986-03-11 Minolta Camera Kabushiki Kaisha Camera with an improved focus detecting system
US4734571A (en) * 1985-10-30 1988-03-29 Minolta Camera Kabushiki Kaisha Focus condition detecting device having correlation calculation means and means for determining the range of shifts of image signals
JPH0540036A (en) * 1991-06-07 1993-02-19 Nikon Corp Focus detecting device
JPH0540037A (en) * 1991-06-07 1993-02-19 Nikon Corp Focus detecting device
US5291233A (en) * 1989-01-30 1994-03-01 Minolta Camera Kabushiki Kaisha Camera having an auto zoom function
JPH08211284A (en) * 1991-06-07 1996-08-20 Nikon Corp Focus detector
JP2009139795A (en) * 2007-12-10 2009-06-25 Sony Corp Imaging device
US8339505B2 (en) 2008-03-22 2012-12-25 Sanyo Electric Co., Ltd. Electronic camera
JP2015114544A (en) * 2013-12-12 2015-06-22 キヤノン株式会社 Imaging device, control method of the same and control program thereof

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56101128A (en) * 1980-01-14 1981-08-13 Minolta Camera Co Ltd Automatic focus adjusting camera
JPS57128307A (en) * 1981-02-03 1982-08-09 Nippon Kogaku Kk <Nikon> Automatic focus adjuster
JPH0470608B2 (en) * 1981-02-03 1992-11-11 Nippon Kogaku Kk
JPH0235962B2 (en) * 1981-09-24 1990-08-14 Nippon Kogaku Kk
JPS5852607A (en) * 1981-09-24 1983-03-28 Nippon Kogaku Kk <Nikon> Automatic focusing device
US4492448A (en) * 1981-10-02 1985-01-08 Minolta Camera Kabushiki Kaisha Automatic focusing device for use in a camera
JPH0449088B2 (en) * 1982-05-14 1992-08-10 West Electric Co
JPS58198009A (en) * 1982-05-14 1983-11-17 West Electric Co Ltd Ultrasonic auto-focusing device
US4575212A (en) * 1982-12-28 1986-03-11 Minolta Camera Kabushiki Kaisha Camera with an improved focus detecting system
JPS6127107U (en) * 1984-07-23 1986-02-18 ライトロン株式会社 auto focus device
US4734571A (en) * 1985-10-30 1988-03-29 Minolta Camera Kabushiki Kaisha Focus condition detecting device having correlation calculation means and means for determining the range of shifts of image signals
US5291233A (en) * 1989-01-30 1994-03-01 Minolta Camera Kabushiki Kaisha Camera having an auto zoom function
JPH0540037A (en) * 1991-06-07 1993-02-19 Nikon Corp Focus detecting device
JPH0540036A (en) * 1991-06-07 1993-02-19 Nikon Corp Focus detecting device
JPH08211284A (en) * 1991-06-07 1996-08-20 Nikon Corp Focus detector
JP2009139795A (en) * 2007-12-10 2009-06-25 Sony Corp Imaging device
US8218962B2 (en) 2007-12-10 2012-07-10 Sony Corporation Image-capturing apparatus
US8339505B2 (en) 2008-03-22 2012-12-25 Sanyo Electric Co., Ltd. Electronic camera
JP2015114544A (en) * 2013-12-12 2015-06-22 キヤノン株式会社 Imaging device, control method of the same and control program thereof

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