JPS57148709A - Focus detecting optical device - Google Patents

Focus detecting optical device

Info

Publication number
JPS57148709A
JPS57148709A JP3451981A JP3451981A JPS57148709A JP S57148709 A JPS57148709 A JP S57148709A JP 3451981 A JP3451981 A JP 3451981A JP 3451981 A JP3451981 A JP 3451981A JP S57148709 A JPS57148709 A JP S57148709A
Authority
JP
Japan
Prior art keywords
lens
reimage
photoelectric transducer
plate
plane including
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
JP3451981A
Other languages
Japanese (ja)
Inventor
Toru Fukuhara
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.)
Nikon Corp
Original Assignee
Nikon Corp
Nippon Kogaku KK
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 Nikon Corp, Nippon Kogaku KK filed Critical Nikon Corp
Priority to JP3451981A priority Critical patent/JPS57148709A/en
Publication of JPS57148709A publication Critical patent/JPS57148709A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/28—Systems for automatic generation of focusing signals
    • G02B7/34—Systems for automatic generation of focusing signals using different areas in a pupil plane

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To ensure the good compensation of various aberrations for a reimage forming lens although this lens has a small size and to detect the focusing state of an objective lens, by securing a symmetrical relation of distribution among a reimage forming lens and a photoelectric transducer plus another reimage forming lens and the photoelectric transducer to a normal line set at the center part of a focus plate. CONSTITUTION:A focus plate S, a reimage forming lens L4 and a photoelectric transducer P4 are arranged so that a plane including the plate S, a plane including a main plane of the lens L4 and a plane including the light receiving surface of the transducer P4 cross to each other on a straight line vertical to the paper surface after passing a point 0. In the same way, a lens L3 and a photoelectric transducer P3 are arranged at the positions which are symmetrical to a normal line set at the center part S0 of the plate S. In such constitution, the focusing state of an objective lens L is detected when the lens L moves toward the optical axis and by the outputs of the transducers P3 and P4. In this case, the picture angle theta2 can be reduced for the lenses L3 and L4 to ensure the good compensation of various aberrations.
JP3451981A 1981-03-12 1981-03-12 Focus detecting optical device Pending JPS57148709A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3451981A JPS57148709A (en) 1981-03-12 1981-03-12 Focus detecting optical device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3451981A JPS57148709A (en) 1981-03-12 1981-03-12 Focus detecting optical device

Publications (1)

Publication Number Publication Date
JPS57148709A true JPS57148709A (en) 1982-09-14

Family

ID=12416507

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3451981A Pending JPS57148709A (en) 1981-03-12 1981-03-12 Focus detecting optical device

Country Status (1)

Country Link
JP (1) JPS57148709A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177813A (en) * 1984-09-25 1986-04-21 Canon Inc Focus detector
US4905034A (en) * 1986-03-25 1990-02-27 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic focusing projector
WO1992017805A1 (en) * 1991-03-29 1992-10-15 Olympus Optical Co., Ltd. Apparatus for sensing automatic focusing

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295221A (en) * 1976-02-04 1977-08-10 Minolta Camera Co Ltd Detector for focusing

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295221A (en) * 1976-02-04 1977-08-10 Minolta Camera Co Ltd Detector for focusing

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177813A (en) * 1984-09-25 1986-04-21 Canon Inc Focus detector
JPH0588446B2 (en) * 1984-09-25 1993-12-22 Canon Kk
US4905034A (en) * 1986-03-25 1990-02-27 Asahi Kogaku Kogyo Kabushiki Kaisha Automatic focusing projector
US4949115A (en) * 1986-03-25 1990-08-14 Asahi Kogaku Kogyo K.K. Automatic focusing projector
WO1992017805A1 (en) * 1991-03-29 1992-10-15 Olympus Optical Co., Ltd. Apparatus for sensing automatic focusing
US5245173A (en) * 1991-03-29 1993-09-14 Olympus Optical Co., Ltd. Automatic focal-point sensing apparatus sensing high and low magnification

Similar Documents

Publication Publication Date Title
JPS56165111A (en) Telecentric illuminating system
JPS5295221A (en) Detector for focusing
JPS6441805A (en) Position detecting apparatus of two bodies, which are separated by minute distance
ATE24780T1 (en) WIDE ANGLE OPTICAL DEVICE.
JPS57105715A (en) Uniform scanning lens having high resolving power
JPS57148709A (en) Focus detecting optical device
JPS5689005A (en) Position detector
JPS5746222A (en) Large aperture ratio objective lens
JPS55155331A (en) Focus detector
JPS57173810A (en) Optical system of endoscope objective lens
JPS5789731A (en) Focusing screen
JPS57192920A (en) Scanning optical system for compensating plane falling
EP0298725A3 (en) Focus detecting apparatus for camera
JPS547323A (en) Optical system for detecting point of focus
JPS57154224A (en) Focus detecting device of camera
JPS56130725A (en) Optical device for focus detection
JPS53105223A (en) Optical system of distance detector for automatic focusing
JPS547927A (en) Photographic lens of excellent focusing operation
JPS57197404A (en) Measuring method of radius of curvature
JPS57104911A (en) Focus detecting device
JPS6456407A (en) Focus detector
JPS5461503A (en) Detection of focal point
JPS5775071A (en) Optical system for focus detection of television camera
JPS56132307A (en) Condenser
JPS57189106A (en) Focus detector