GB2021894A - Monocular range-finders - Google Patents

Monocular range-finders

Info

Publication number
GB2021894A
GB2021894A GB7917310A GB7917310A GB2021894A GB 2021894 A GB2021894 A GB 2021894A GB 7917310 A GB7917310 A GB 7917310A GB 7917310 A GB7917310 A GB 7917310A GB 2021894 A GB2021894 A GB 2021894A
Authority
GB
United Kingdom
Prior art keywords
lens
ctd
setting
image
objective lens
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
GB7917310A
Other versions
GB2021894B (en
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of GB2021894A publication Critical patent/GB2021894A/en
Application granted granted Critical
Publication of GB2021894B publication Critical patent/GB2021894B/en
Expired 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
    • G02B7/343—Systems for automatic generation of focusing signals using different areas in a pupil plane using light beam separating prisms
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Focusing (AREA)
  • Measurement Of Optical Distance (AREA)
  • Studio Devices (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

A portion of an image of an object produced by the objective lens e.g. in single lens reflex cameras, is projected onto image sensors (CTD 1, CTD 2) using homologous microprism grids arranged in an enantiomorphic fashion parallel to each other. A pulse generator (3) produces a common pulse train of frequency fA for read-out of the image sensors, which are or utilise charge transfer devices. The output signals of the sensors (CTD 1, CTD 2) are fed to a differential amplifier (4) which forms a lens-setting signal from the difference in brightness between them. The difference signal, integrated over one or more line periods, has a minimum value when the range setting of the objective lens is correct. The output signal is fed to an integrator (5), and used to drive a display means in the case of semi-automatic range setting so that manual range setting can be effected by watching the display whilst adjusting the objective lens. In a fully automatic arrangement a lens drive starts from the lens close-up position and adjusts the lens to remoter setting until a first minimum is detected, whereafter a fine setting can be carried out. <IMAGE>
GB7917310A 1978-05-18 1979-05-17 Monocular range-finders Expired GB2021894B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782821722 DE2821722C2 (en) 1978-05-18 1978-05-18 Device for automatic or semi-automatic focusing of the image of an object on an image plane

Publications (2)

Publication Number Publication Date
GB2021894A true GB2021894A (en) 1979-12-05
GB2021894B GB2021894B (en) 1982-10-27

Family

ID=6039644

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7917310A Expired GB2021894B (en) 1978-05-18 1979-05-17 Monocular range-finders

Country Status (4)

Country Link
JP (1) JPS54153029A (en)
DE (1) DE2821722C2 (en)
FR (1) FR2426272B1 (en)
GB (1) GB2021894B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448732A1 (en) * 1979-02-09 1980-09-05 Asahi Chemical Ind FOCUSING DETECTION DEVICE FOR A CAMERA
FR2512561A1 (en) * 1981-09-10 1983-03-11 Asahi Optical Co Ltd METHOD FOR DETECTING FOCUS
GB2143700A (en) * 1983-07-20 1985-02-13 Zeiss Jena Veb Carl Object location
GB2195214A (en) * 1980-12-10 1988-03-30 Emi Ltd Automatically focussing system for an optical system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4414470A (en) * 1979-02-08 1983-11-08 Ricoh Company, Ltd. Pupil divisional focusing position detection apparatus using lenticula lens
JPS5788415A (en) * 1980-11-21 1982-06-02 Mamiya Koki Kk Automatic focusing control device
JPS5933409A (en) * 1982-08-19 1984-02-23 Olympus Optical Co Ltd Focusing detector

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4840089A (en) * 1971-09-26 1973-06-12
DE2156617C3 (en) * 1971-11-15 1980-08-21 Ernst Leitz Wetzlar Gmbh, 6330 Wetzlar Device for determining the position of the plane of maximum amplitude of a spatial frequency, for example in the case of a range finder
CH553421A (en) * 1971-11-15 1974-08-30 Leitz Ernst Gmbh DEVICE FOR INDEPENDENT FOCUSING.
US4083056A (en) * 1975-09-09 1978-04-04 Asahi Kogaku Kogyo Kabushiki Kaisha Focus detecting device for single-lens reflex cameras
JPS52110032A (en) * 1976-03-12 1977-09-14 Canon Inc Detector for focusing
JPS5914723B2 (en) * 1976-05-22 1984-04-05 旭光学工業株式会社 Focus detection device for single-lens reflex camera
JPS6044643B2 (en) * 1977-03-18 1985-10-04 旭光学工業株式会社 focus detection device
JPS5593325A (en) * 1979-01-09 1980-07-15 Sharp Corp Precharge circuit of mos transistor

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2448732A1 (en) * 1979-02-09 1980-09-05 Asahi Chemical Ind FOCUSING DETECTION DEVICE FOR A CAMERA
GB2195214A (en) * 1980-12-10 1988-03-30 Emi Ltd Automatically focussing system for an optical system
FR2512561A1 (en) * 1981-09-10 1983-03-11 Asahi Optical Co Ltd METHOD FOR DETECTING FOCUS
GB2143700A (en) * 1983-07-20 1985-02-13 Zeiss Jena Veb Carl Object location

Also Published As

Publication number Publication date
DE2821722A1 (en) 1979-11-22
GB2021894B (en) 1982-10-27
FR2426272B1 (en) 1985-12-27
FR2426272A1 (en) 1979-12-14
DE2821722C2 (en) 1981-09-17
JPS54153029A (en) 1979-12-01

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee