JPS5678823A - Automatic focus control device - Google Patents

Automatic focus control device

Info

Publication number
JPS5678823A
JPS5678823A JP15665779A JP15665779A JPS5678823A JP S5678823 A JPS5678823 A JP S5678823A JP 15665779 A JP15665779 A JP 15665779A JP 15665779 A JP15665779 A JP 15665779A JP S5678823 A JPS5678823 A JP S5678823A
Authority
JP
Japan
Prior art keywords
lens
wbn
wan
range finding
prism
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
JP15665779A
Other languages
Japanese (ja)
Other versions
JPH0410051B2 (en
Inventor
Kunihiko Araki
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 JP15665779A priority Critical patent/JPS5678823A/en
Priority to US06/201,528 priority patent/US4387975A/en
Priority to DE3050920A priority patent/DE3050920C2/en
Priority to DE3041098A priority patent/DE3041098C2/en
Publication of JPS5678823A publication Critical patent/JPS5678823A/en
Publication of JPH0410051B2 publication Critical patent/JPH0410051B2/ja
Granted legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make it unnecessary to hold the lens during range finding to make it possible to shorten the time for focusing, by obtaining and correcting the finding error caused by lens movement.
CONSTITUTION: The light beam from the object is incident to photoelectric elements A1WAn through mirror 20, lens 21, and prism 22, and is incident to photoelectric elements B1WBn through mirror 23, lens 24, and prism 22. Photodiode arrays CCd, BBD, and so on are used in photoelectric element groups A1WAn and B4WBn. The defocus signal corresponding to phase slip j' of patterns A and B formed by outputs of photoelectric element groups A1WAn and B1WBn includes the error indicated by the two-dots chain line or the one-dot chain line in the figure when the lens is moved in a constant speed. Then, the true value is calculated from the range finding value of the defocus signal to control movement of the lens, so that range finding is possible while moving the lens, and the time required for focusing can be shortened.
COPYRIGHT: (C)1981,JPO&Japio
JP15665779A 1979-10-31 1979-12-03 Automatic focus control device Granted JPS5678823A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP15665779A JPS5678823A (en) 1979-12-03 1979-12-03 Automatic focus control device
US06/201,528 US4387975A (en) 1979-10-31 1980-10-28 Automatic focusing position detection apparatus
DE3050920A DE3050920C2 (en) 1979-10-31 1980-10-31 Device for the automatic focusing of an optical system on an object
DE3041098A DE3041098C2 (en) 1979-10-31 1980-10-31 Device for determining the focus of an optical system on an object

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15665779A JPS5678823A (en) 1979-12-03 1979-12-03 Automatic focus control device

Publications (2)

Publication Number Publication Date
JPS5678823A true JPS5678823A (en) 1981-06-29
JPH0410051B2 JPH0410051B2 (en) 1992-02-24

Family

ID=15632440

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15665779A Granted JPS5678823A (en) 1979-10-31 1979-12-03 Automatic focus control device

Country Status (1)

Country Link
JP (1) JPS5678823A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492448A (en) * 1981-10-02 1985-01-08 Minolta Camera Kabushiki Kaisha Automatic focusing device for use in a camera
US4816856A (en) * 1986-03-31 1989-03-28 Minolta Camera Kabushiki Kaisha Automatic focus control device
US4882601A (en) * 1986-05-16 1989-11-21 Minolta Camera Kabushiki Kaisha Camera with an automatic focusing device
JPH01309012A (en) * 1988-06-08 1989-12-13 Sigma:Kk Automatic focus adjusting device
US4888609A (en) * 1985-01-17 1989-12-19 Minolta Camera Kabushiki Kaisha Automatic focus adjusting apparatus
US4910548A (en) * 1986-05-16 1990-03-20 Minolta Camera Kabushiki Kaisha Camera with a multi-zone focus detecting device
US4924250A (en) * 1986-03-31 1990-05-08 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5168299A (en) * 1986-05-16 1992-12-01 Minolta Camera Co., Ltd. Camera with a multi-zone focus detecting device
US5192966A (en) * 1986-03-31 1993-03-09 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5196881A (en) * 1986-03-31 1993-03-23 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5218395A (en) * 1986-05-16 1993-06-08 Minolta Camera Kabushiki Kaisha Camera with a multi-zone focus detecting device
JP2006039317A (en) * 2004-07-28 2006-02-09 Hamamatsu Photonics Kk Automatic focusing device and microscope using the same

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4492448A (en) * 1981-10-02 1985-01-08 Minolta Camera Kabushiki Kaisha Automatic focusing device for use in a camera
US5079582A (en) * 1985-01-14 1992-01-07 Minolta Camera Kabushiki Kaisha Automatic focus adjusting apparatus
US4888609A (en) * 1985-01-17 1989-12-19 Minolta Camera Kabushiki Kaisha Automatic focus adjusting apparatus
US5001509A (en) * 1985-01-17 1991-03-19 Minolta Camera Kabushiki Kaisha Automatic focus adjusting apparatus
US4816856A (en) * 1986-03-31 1989-03-28 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5196881A (en) * 1986-03-31 1993-03-23 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5192966A (en) * 1986-03-31 1993-03-09 Minolta Camera Kabushiki Kaisha Automatic focus control device
US4924250A (en) * 1986-03-31 1990-05-08 Minolta Camera Kabushiki Kaisha Automatic focus control device
US5168299A (en) * 1986-05-16 1992-12-01 Minolta Camera Co., Ltd. Camera with a multi-zone focus detecting device
US4910548A (en) * 1986-05-16 1990-03-20 Minolta Camera Kabushiki Kaisha Camera with a multi-zone focus detecting device
US4882601A (en) * 1986-05-16 1989-11-21 Minolta Camera Kabushiki Kaisha Camera with an automatic focusing device
US5218395A (en) * 1986-05-16 1993-06-08 Minolta Camera Kabushiki Kaisha Camera with a multi-zone focus detecting device
JPH01309012A (en) * 1988-06-08 1989-12-13 Sigma:Kk Automatic focus adjusting device
JP2006039317A (en) * 2004-07-28 2006-02-09 Hamamatsu Photonics Kk Automatic focusing device and microscope using the same

Also Published As

Publication number Publication date
JPH0410051B2 (en) 1992-02-24

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