JPS57105710A - Focus detecting device - Google Patents

Focus detecting device

Info

Publication number
JPS57105710A
JPS57105710A JP18182980A JP18182980A JPS57105710A JP S57105710 A JPS57105710 A JP S57105710A JP 18182980 A JP18182980 A JP 18182980A JP 18182980 A JP18182980 A JP 18182980A JP S57105710 A JPS57105710 A JP S57105710A
Authority
JP
Japan
Prior art keywords
signal
generated
case
phir1
photographed
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
JP18182980A
Other languages
Japanese (ja)
Inventor
Yoshijiro Suzuki
Yoshiharu Takahashi
Kazuo Shiozawa
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP18182980A priority Critical patent/JPS57105710A/en
Publication of JPS57105710A publication Critical patent/JPS57105710A/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
    • G02B7/30—Systems for automatic generation of focusing signals using parallactic triangle with a base line
    • G02B7/32—Systems for automatic generation of focusing signals using parallactic triangle with a base line using active means, e.g. light emitter

Landscapes

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

Abstract

PURPOSE:To exactly stop a photographing lens at a focusing position even in case when luminance of an object to be photographed is low, by generating a stroboscopic light emission signal in case when transfer of a focusing detecting element from a CCD is not started within a prescribed time. CONSTITUTION:A CCD controlling circuit receives a driving pulse from an OSC, and a CCD module starts to store by a reset signal phiR. By the signal phiR, a monostable multivibrator MMV generates a signal phiR1 having constant time width. On the other hand, an FF generates a reset signal phiT1 by the signal phiR. An inverted signal of the signal phiR1, and the signal phiT1 are inputted to an AND circuit, and a signal phiT2 is generated. In case when luminance of an object to be photographed is high, a transfer signal phiT is generated when the signal phiR1 is being continued, the FF is reset, phiR1 and phiT1 disappear, and the signal phiT2 is not generated. In case when the luminance of an object to be photographed is low, the signal phiT2 is generated, a stroboscopic trigger signal phiST is generated through a differentiating circuit Diff, stroboscopic light is emitted, and even in case when the luminance of an object to be photographed is low, the photographing lens is stopped exactly at a focused position.
JP18182980A 1980-12-24 1980-12-24 Focus detecting device Pending JPS57105710A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18182980A JPS57105710A (en) 1980-12-24 1980-12-24 Focus detecting device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18182980A JPS57105710A (en) 1980-12-24 1980-12-24 Focus detecting device

Publications (1)

Publication Number Publication Date
JPS57105710A true JPS57105710A (en) 1982-07-01

Family

ID=16107540

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18182980A Pending JPS57105710A (en) 1980-12-24 1980-12-24 Focus detecting device

Country Status (1)

Country Link
JP (1) JPS57105710A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046516A (en) * 1983-11-18 1985-03-13 Minolta Camera Co Ltd Focus detector for camera using preliminary irradiation
JP2008024260A (en) * 2006-07-25 2008-02-07 Kayaba Ind Co Ltd Mixer drum driving device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4853717A (en) * 1971-11-02 1973-07-28
JPS53141031A (en) * 1977-05-14 1978-12-08 Ricoh Co Ltd Camera having focusing-state detecting element

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4853717A (en) * 1971-11-02 1973-07-28
JPS53141031A (en) * 1977-05-14 1978-12-08 Ricoh Co Ltd Camera having focusing-state detecting element

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6046516A (en) * 1983-11-18 1985-03-13 Minolta Camera Co Ltd Focus detector for camera using preliminary irradiation
JP2008024260A (en) * 2006-07-25 2008-02-07 Kayaba Ind Co Ltd Mixer drum driving device
US8104947B2 (en) 2006-07-25 2012-01-31 Kayaba Industry Co., Ltd. Concrete agitating drum driving device

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