JPS5773725A - Camera having focus detector - Google Patents

Camera having focus detector

Info

Publication number
JPS5773725A
JPS5773725A JP14933780A JP14933780A JPS5773725A JP S5773725 A JPS5773725 A JP S5773725A JP 14933780 A JP14933780 A JP 14933780A JP 14933780 A JP14933780 A JP 14933780A JP S5773725 A JPS5773725 A JP S5773725A
Authority
JP
Japan
Prior art keywords
capacitor
circuit
period
mirror
resistance
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
JP14933780A
Other languages
Japanese (ja)
Inventor
Nobuhiko Terui
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 JP14933780A priority Critical patent/JPS5773725A/en
Publication of JPS5773725A publication Critical patent/JPS5773725A/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
    • G02B7/36—Systems for automatic generation of focusing signals using image sharpness techniques, e.g. image processing techniques for generating autofocus signals

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE:To prevent a driving circuit from malfunctioning by providing a single- lens reflect camera with a timer circuit which holds the operation of a stopping circuit for a prescribed time even after the interception of incident light ends. CONSTITUTION:When a film F is exposed and a mirror returns to original positions 3 and 4, a switch S1 turns off by coupling with the mirror. In a following period determined by the time constant of a capacitor C1 and a resistance R5, however, the charging voltage of the capacitor C1 does not reach a reference voltage obtained through the voltage division of resistances R5 and R7, and consequently while the output of a comparator 12 is an Lo, outputs of NAND gates 8, 9 and 10 are His, so that none of a motor M and light emitting diodes D1, D2 and D3 operates. So that the said period is set longer than the period when the mirror returns to the positions 3 and 4 and then vibrates to make a focus detector 6 generate an erroneous output, the time constant of the capacitor C1 and resistance R5 is set, thereby supplying the erroneous output to either a motor driving circuit nor a display circuit.
JP14933780A 1980-10-27 1980-10-27 Camera having focus detector Pending JPS5773725A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14933780A JPS5773725A (en) 1980-10-27 1980-10-27 Camera having focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14933780A JPS5773725A (en) 1980-10-27 1980-10-27 Camera having focus detector

Publications (1)

Publication Number Publication Date
JPS5773725A true JPS5773725A (en) 1982-05-08

Family

ID=15472894

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14933780A Pending JPS5773725A (en) 1980-10-27 1980-10-27 Camera having focus detector

Country Status (1)

Country Link
JP (1) JPS5773725A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59135444A (en) * 1983-01-24 1984-08-03 Fuji Photo Optical Co Ltd Auto-focus device of camera
US5311229A (en) * 1990-02-07 1994-05-10 Canon Kabushiki Kaisha Camera with camoperated mirror driving mechanism

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54136327A (en) * 1978-04-14 1979-10-23 Olympus Optical Co Ltd Focus detector

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54136327A (en) * 1978-04-14 1979-10-23 Olympus Optical Co Ltd Focus detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59135444A (en) * 1983-01-24 1984-08-03 Fuji Photo Optical Co Ltd Auto-focus device of camera
US5311229A (en) * 1990-02-07 1994-05-10 Canon Kabushiki Kaisha Camera with camoperated mirror driving mechanism
US5408290A (en) * 1990-02-07 1995-04-18 Canon Kabushiki Kaisha Camera with motorized drive source
US5479235A (en) * 1990-02-07 1995-12-26 Canon Kabushiki Kaisha Camera with cam-operated mirror driving mechanism

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