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JPS55111927A - Automatic focus detector - Google Patents

Automatic focus detector

Info

Publication number
JPS55111927A
JPS55111927A JP1892279A JP1892279A JPS55111927A JP S55111927 A JPS55111927 A JP S55111927A JP 1892279 A JP1892279 A JP 1892279A JP 1892279 A JP1892279 A JP 1892279A JP S55111927 A JPS55111927 A JP S55111927A
Authority
JP
Japan
Prior art keywords
full aperture
distance measurement
sensor groups
lens
photo sensor
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.)
Granted
Application number
JP1892279A
Other languages
Japanese (ja)
Other versions
JPS626206B2 (en
Inventor
Mikio Kobayashi
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 JP1892279A priority Critical patent/JPS55111927A/en
Publication of JPS55111927A publication Critical patent/JPS55111927A/en
Publication of JPS626206B2 publication Critical patent/JPS626206B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To prevent the decrease in distance measurement accuracy by various full aperture value lenses and make possible the detection of automatic focusing even at the large full aperture value by selecting plural kinds of a pair of photo sensor groups according to the lens full aperture values.
CONSTITUTION: The incident light quantity photo detecting signals through the photographing lens by pairs of photo sensor groups SA10... and SB10, SA20... and SB20..., SA30 and SB30... of different distances of the array elements 13 which are scanned and driven by a photo sensor drive circuit 14 go through a multiplexer 8 and become the distance measurement signals of coincidence type. This multiplexer 8 is controlled by the lens full aperture signal and the sensor groups SA10... and SB10..., SA20... and SB10...,... are selected according to the lens full aperture, thus the occurrence of photo detection errors is obviated by the correct photo sensor groups of different distances, and the base distance at the distance measurement becomes a correct value, due to which the distance measurement accuracy does not decrease irrespective of the full aperture. Hence, the automatic focus detection is accomplished even if the full aperture range is expanded.
COPYRIGHT: (C)1980,JPO&Japio
JP1892279A 1979-02-20 1979-02-20 Automatic focus detector Granted JPS55111927A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1892279A JPS55111927A (en) 1979-02-20 1979-02-20 Automatic focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1892279A JPS55111927A (en) 1979-02-20 1979-02-20 Automatic focus detector

Publications (2)

Publication Number Publication Date
JPS55111927A true JPS55111927A (en) 1980-08-29
JPS626206B2 JPS626206B2 (en) 1987-02-09

Family

ID=11985102

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1892279A Granted JPS55111927A (en) 1979-02-20 1979-02-20 Automatic focus detector

Country Status (1)

Country Link
JP (1) JPS55111927A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55124509U (en) * 1979-02-28 1980-09-03
JPS55144211A (en) * 1979-04-27 1980-11-11 Fuji Photo Optical Co Ltd Focus detector of camera
JPS59133512A (en) * 1983-01-21 1984-07-31 Nippon Kogaku Kk <Nikon> Focus detecting device
JPS59168713U (en) * 1983-04-26 1984-11-12 京セラ株式会社 Sensor switching device in automatic focus detection camera
US4509842A (en) * 1983-02-01 1985-04-09 Minolta Camera Kabushiki Kaisha Camera system capable of focus detection through an interchangeable objective lens
US4959677A (en) * 1986-10-01 1990-09-25 Canon Kabushiki Kaisha Device for detecting the focus adjusted state of an objecting lens
US5525792A (en) * 1990-01-18 1996-06-11 Nikon Corporation Camera having superimposed information display device
US7471889B2 (en) 2004-04-13 2008-12-30 Canon Kabushiki Kaisha Focus detection system for focus adjustment having differently-sized apertures and using a pair of signals formed by a pencil of rays passing through different regions of exit pupil of imaging lens

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5395624A (en) * 1977-01-27 1978-08-22 Leitz Ernst Gmbh Electroooptical light collecting device for photographic camera

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5395624A (en) * 1977-01-27 1978-08-22 Leitz Ernst Gmbh Electroooptical light collecting device for photographic camera

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55124509U (en) * 1979-02-28 1980-09-03
JPS6127374Y2 (en) * 1979-02-28 1986-08-15
JPS55144211A (en) * 1979-04-27 1980-11-11 Fuji Photo Optical Co Ltd Focus detector of camera
JPS59133512A (en) * 1983-01-21 1984-07-31 Nippon Kogaku Kk <Nikon> Focus detecting device
JPH0473566B2 (en) * 1983-01-21 1992-11-24
US4509842A (en) * 1983-02-01 1985-04-09 Minolta Camera Kabushiki Kaisha Camera system capable of focus detection through an interchangeable objective lens
JPS59168713U (en) * 1983-04-26 1984-11-12 京セラ株式会社 Sensor switching device in automatic focus detection camera
US4959677A (en) * 1986-10-01 1990-09-25 Canon Kabushiki Kaisha Device for detecting the focus adjusted state of an objecting lens
US5525792A (en) * 1990-01-18 1996-06-11 Nikon Corporation Camera having superimposed information display device
US7471889B2 (en) 2004-04-13 2008-12-30 Canon Kabushiki Kaisha Focus detection system for focus adjustment having differently-sized apertures and using a pair of signals formed by a pencil of rays passing through different regions of exit pupil of imaging lens

Also Published As

Publication number Publication date
JPS626206B2 (en) 1987-02-09

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