JPS57125911A - Automatic focusing device - Google Patents

Automatic focusing device

Info

Publication number
JPS57125911A
JPS57125911A JP1182581A JP1182581A JPS57125911A JP S57125911 A JPS57125911 A JP S57125911A JP 1182581 A JP1182581 A JP 1182581A JP 1182581 A JP1182581 A JP 1182581A JP S57125911 A JPS57125911 A JP S57125911A
Authority
JP
Japan
Prior art keywords
distance
signal
value
focusing
automatic focusing
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
JP1182581A
Other languages
Japanese (ja)
Inventor
Toshiichi Ichiyanagi
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Priority to JP1182581A priority Critical patent/JPS57125911A/en
Priority to US06/287,698 priority patent/US4402586A/en
Publication of JPS57125911A publication Critical patent/JPS57125911A/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

Landscapes

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

Abstract

PURPOSE:To execute always accurate focusing operation by generating an output signal when the set value of a distance ring is below a prescribed distance, and driving the distance ring up to the prescribed distance value independently from a distance measuring signal. CONSTITUTION:In the case of setting a distance ring within a <=1m manual range and photographing an object located within an automatic focusing range (for example, 2m), the user presses an operating button, then a switch S0 is turned on, and a converter U1 operates, to conduct electricity to integrated circuits IC1-IC3, and focusing is accomplished with the object information inputted from the line sensor IC1 to IC2 and the set distance information inputted from switches S1-S6 to the IC2. Since the distance value of this time is a manual value, the switch SW1 is turned on, and a signal is fed from an SFC circuit to the terminal 14 of the IC2, and from the output terminals A-D of the IC2 a signal is fed to a driving circuit DDC, by which a motor M1 is driven and the distance ring is moved up to the automatic focusing range. Thereby, the accurate focusing is accomplished at all times.
JP1182581A 1980-08-04 1981-01-29 Automatic focusing device Pending JPS57125911A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1182581A JPS57125911A (en) 1981-01-29 1981-01-29 Automatic focusing device
US06/287,698 US4402586A (en) 1980-08-04 1981-07-28 Focusing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1182581A JPS57125911A (en) 1981-01-29 1981-01-29 Automatic focusing device

Publications (1)

Publication Number Publication Date
JPS57125911A true JPS57125911A (en) 1982-08-05

Family

ID=11788538

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1182581A Pending JPS57125911A (en) 1980-08-04 1981-01-29 Automatic focusing device

Country Status (1)

Country Link
JP (1) JPS57125911A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180347856A1 (en) * 2017-06-02 2018-12-06 Noritz Corporation Heating heat-source apparatus and control method thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20180347856A1 (en) * 2017-06-02 2018-12-06 Noritz Corporation Heating heat-source apparatus and control method thereof
US10921026B2 (en) 2017-06-02 2021-02-16 Noritz Corporation Heating heat-source apparatus and control method thereof

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