JPS5766424A - Automatic focusing device of camera - Google Patents

Automatic focusing device of camera

Info

Publication number
JPS5766424A
JPS5766424A JP14181580A JP14181580A JPS5766424A JP S5766424 A JPS5766424 A JP S5766424A JP 14181580 A JP14181580 A JP 14181580A JP 14181580 A JP14181580 A JP 14181580A JP S5766424 A JPS5766424 A JP S5766424A
Authority
JP
Japan
Prior art keywords
voltage
frequency
objective lens
clock pulses
focus point
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
JP14181580A
Other languages
Japanese (ja)
Inventor
Seiichi Nishida
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 JP14181580A priority Critical patent/JPS5766424A/en
Publication of JPS5766424A publication Critical patent/JPS5766424A/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

Landscapes

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

Abstract

PURPOSE:To eliminate the need for a mechanical stopping mechanism by generating an in-focus point voltage by the video signal of an object outputted from an image sensor, and by driving an objective lens by a pulse motor by converting the said voltage and a frequency. CONSTITUTION:A video signal 3 including information on the distance between an object 1 and a camera is outputted by an image sensor 2 and then decoded by an automatic focusing detecting circuit 4 to generate a DC voltage showing the in-focus point of an objective lens which corresponds to the distance from the object. This voltage is inputted to a V-F converting circuit 6 to output clock pulses 7 of a frequency which corresponds to the in-focus point. The clock pulses are amplified by a pulse driving circuit 8 and a prescribed number of clock pulses 9, proportional to the frequency, are supplied to a pulse motor 10, thereby driving the objective lens.
JP14181580A 1980-10-09 1980-10-09 Automatic focusing device of camera Pending JPS5766424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14181580A JPS5766424A (en) 1980-10-09 1980-10-09 Automatic focusing device of camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14181580A JPS5766424A (en) 1980-10-09 1980-10-09 Automatic focusing device of camera

Publications (1)

Publication Number Publication Date
JPS5766424A true JPS5766424A (en) 1982-04-22

Family

ID=15300766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14181580A Pending JPS5766424A (en) 1980-10-09 1980-10-09 Automatic focusing device of camera

Country Status (1)

Country Link
JP (1) JPS5766424A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991406A (en) * 1988-07-27 1991-02-12 Kabushiki Kaisha Toshiba Air conditioner
JPH0698240A (en) * 1992-12-17 1994-04-08 Hitachi Ltd Automatic focusing device for video camera

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4991406A (en) * 1988-07-27 1991-02-12 Kabushiki Kaisha Toshiba Air conditioner
JPH0698240A (en) * 1992-12-17 1994-04-08 Hitachi Ltd Automatic focusing device for video camera
JPH0697784B2 (en) * 1992-12-17 1994-11-30 株式会社日立製作所 Video camera autofocus device

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