JPS5967505A - Automatic focusing device of video camera - Google Patents

Automatic focusing device of video camera

Info

Publication number
JPS5967505A
JPS5967505A JP57177531A JP17753182A JPS5967505A JP S5967505 A JPS5967505 A JP S5967505A JP 57177531 A JP57177531 A JP 57177531A JP 17753182 A JP17753182 A JP 17753182A JP S5967505 A JPS5967505 A JP S5967505A
Authority
JP
Japan
Prior art keywords
image
sensor
circuit
focusing
picked up
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
JP57177531A
Inventor
Shinji Urata
Original Assignee
Asahi 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 Asahi Optical Co Ltd filed Critical Asahi Optical Co Ltd
Priority to JP57177531A priority Critical patent/JPS5967505A/en
Publication of JPS5967505A publication Critical patent/JPS5967505A/en
Application status is Pending legal-status Critical

Links

Classifications

    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B7/00Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28Systems for automatic generation of focusing signals
    • G02B7/282Autofocusing of zoom lenses

Abstract

PURPOSE:To stabilize a focusing operation by making the detection region of a sensor large on a telephoto side and small on a wide angle side. CONSTITUTION:When a zoom lens is driven to zoom, the distance information up to an object is detected by a focusing length detection circuit 4, and the distance information is inputted to a sensor area changing circuit 6. The circuit 6 outputs the sensor area information corresponding to each focal length to an automatic focusing sensor 7 in accordance with the dinstance information inputted thereto. An image to be picked up past a photographing lens 1 is formed an image on an image pikup plane 10a, and a part thereof is formed an image on the sensor 7 as well by a beam splitter 9. Since the sensor 7 is limited of the detection region in accordance with the sensor area information from the circuit 6, the sensor outputs a part of the image to be picked up formed the image by the splitter 9 to a processing circuit 11 which emits a focusing signal to a motor driving circuit 12. A motor 13 is run by said circuit to drive and rotate a focusing ring so that the automatic focusing operation for the image to be picked up in the limited detection region is accomplished.
JP57177531A 1982-10-12 1982-10-12 Automatic focusing device of video camera Pending JPS5967505A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP57177531A JPS5967505A (en) 1982-10-12 1982-10-12 Automatic focusing device of video camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57177531A JPS5967505A (en) 1982-10-12 1982-10-12 Automatic focusing device of video camera

Publications (1)

Publication Number Publication Date
JPS5967505A true JPS5967505A (en) 1984-04-17

Family

ID=16032552

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57177531A Pending JPS5967505A (en) 1982-10-12 1982-10-12 Automatic focusing device of video camera

Country Status (1)

Country Link
JP (1) JPS5967505A (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183878A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPS60183877A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPH01309013A (en) * 1988-06-07 1989-12-13 Canon Inc Focal point detector and camera
US4905032A (en) * 1987-11-06 1990-02-27 Minolta Camera Kabushiki Kaisha Automatic focus detecting device
US4935763A (en) * 1987-02-02 1990-06-19 Minolta Camera Kabushiki Kaisha Camera having a zoom lens unit
JPH02183239A (en) * 1989-01-09 1990-07-17 Olympus Optical Co Ltd Camera
JPH03141311A (en) * 1989-10-27 1991-06-17 Fuji Electric Co Ltd Video position detector
US5053801A (en) * 1987-05-21 1991-10-01 Minolta Camera Kabushiki Kaisha Device for automatically adjusting focus or detecting object distance or camera having such function
US5097282A (en) * 1987-02-06 1992-03-17 Minolta Camera Kabushiki Kaisha Automatic focusing apparatus
US5144357A (en) * 1987-11-06 1992-09-01 Minolta Camera Kabushiki Kaisha Automatic focus detecting means
JPH0566343A (en) * 1991-06-20 1993-03-19 Fuji Photo Film Co Ltd Automatic focusing device
US5196877A (en) * 1988-10-12 1993-03-23 Minolta Camera Kabushiki Kaisha Viewfinder framing device for zoom lens camera
US5243375A (en) * 1987-05-21 1993-09-07 Minolta Camera Kabushiki Kaisha Automatic focus adjusting device for adjusting the focus of the main object to be photographed
JP2013140288A (en) * 2012-01-06 2013-07-18 Canon Inc Focusing device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5391730A (en) * 1977-01-22 1978-08-11 Bell & Howell Japan Automatic focal point adjusting device
JPS57116311A (en) * 1981-01-13 1982-07-20 Canon Inc Measured visual field switching method in focusing position detector
JPS58219505A (en) * 1982-06-14 1983-12-21 Nippon Seimitsu Kogyo Kk Automatic focusing device capable of varying area for detecting focus

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5391730A (en) * 1977-01-22 1978-08-11 Bell & Howell Japan Automatic focal point adjusting device
JPS57116311A (en) * 1981-01-13 1982-07-20 Canon Inc Measured visual field switching method in focusing position detector
JPS58219505A (en) * 1982-06-14 1983-12-21 Nippon Seimitsu Kogyo Kk Automatic focusing device capable of varying area for detecting focus

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60183877A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPS60183878A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
US4935763A (en) * 1987-02-02 1990-06-19 Minolta Camera Kabushiki Kaisha Camera having a zoom lens unit
US5097282A (en) * 1987-02-06 1992-03-17 Minolta Camera Kabushiki Kaisha Automatic focusing apparatus
US5053801A (en) * 1987-05-21 1991-10-01 Minolta Camera Kabushiki Kaisha Device for automatically adjusting focus or detecting object distance or camera having such function
US5243375A (en) * 1987-05-21 1993-09-07 Minolta Camera Kabushiki Kaisha Automatic focus adjusting device for adjusting the focus of the main object to be photographed
US4994841A (en) * 1987-11-06 1991-02-19 Minolta Camera Kabushiki Kaisha Automatic focus detecting means
US4905032A (en) * 1987-11-06 1990-02-27 Minolta Camera Kabushiki Kaisha Automatic focus detecting device
US5144357A (en) * 1987-11-06 1992-09-01 Minolta Camera Kabushiki Kaisha Automatic focus detecting means
JPH01309013A (en) * 1988-06-07 1989-12-13 Canon Inc Focal point detector and camera
US5196877A (en) * 1988-10-12 1993-03-23 Minolta Camera Kabushiki Kaisha Viewfinder framing device for zoom lens camera
JPH02183239A (en) * 1989-01-09 1990-07-17 Olympus Optical Co Ltd Camera
JPH03141311A (en) * 1989-10-27 1991-06-17 Fuji Electric Co Ltd Video position detector
JPH0566343A (en) * 1991-06-20 1993-03-19 Fuji Photo Film Co Ltd Automatic focusing device
JP2013140288A (en) * 2012-01-06 2013-07-18 Canon Inc Focusing device

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