JPS57116311A - Measured visual field switching method in focusing position detector - Google Patents

Measured visual field switching method in focusing position detector

Info

Publication number
JPS57116311A
JPS57116311A JP56003580A JP358081A JPS57116311A JP S57116311 A JPS57116311 A JP S57116311A JP 56003580 A JP56003580 A JP 56003580A JP 358081 A JP358081 A JP 358081A JP S57116311 A JPS57116311 A JP S57116311A
Authority
JP
Japan
Prior art keywords
focus
mark
camera
state
focus state
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
JP56003580A
Other languages
Japanese (ja)
Inventor
Takao Kinoshita
Mitsuya Hosoe
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 JP56003580A priority Critical patent/JPS57116311A/en
Priority to DE19813141959 priority patent/DE3141959A1/en
Publication of JPS57116311A publication Critical patent/JPS57116311A/en
Priority to US06/577,329 priority patent/US4475800A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • 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

Landscapes

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

Abstract

PURPOSE:To obtain an image signal of high quality by switching the sizes of a measured visual field determined by a photoelectric converting means and an electric-signal processing means in accordance with the focal length of an optical system. CONSTITUTION:This describes the focus setting of the photographic lens of a camera by applying a focus-position detection and display system to the camera. A viewfinder visual-field frame 19, a visual-field mark 20 indicating the present position of a measured visual field, and a mark 21 showing that the camera is in focus are provided, and a display element LEDB is arranged right behind the mark 21. Marks 22 and 23 which indicate a front-focus and a rear-focus state are arrow marks which show the rotation directions of a focusing ring for transition from an out-of-focus state to an in-focus state, and display elements LEDs C and A are provided right behind them. Consequently, a photographer knows the focus setting state of the camera by judging which mark lights up, and then stops the setting of the photographic lens in the in-focus state. In the front-focus or rear-focus state, the photographic lens focusing ring is only rotates as shown by the arrow of the mark 22 or 23 until the focusing mark 21 lights up.
JP56003580A 1980-10-23 1981-01-13 Measured visual field switching method in focusing position detector Pending JPS57116311A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56003580A JPS57116311A (en) 1981-01-13 1981-01-13 Measured visual field switching method in focusing position detector
DE19813141959 DE3141959A1 (en) 1980-10-23 1981-10-22 "FOCUS DETECTING SYSTEM"
US06/577,329 US4475800A (en) 1980-10-23 1984-02-08 Focus detecting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56003580A JPS57116311A (en) 1981-01-13 1981-01-13 Measured visual field switching method in focusing position detector

Publications (1)

Publication Number Publication Date
JPS57116311A true JPS57116311A (en) 1982-07-20

Family

ID=11561385

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56003580A Pending JPS57116311A (en) 1980-10-23 1981-01-13 Measured visual field switching method in focusing position detector

Country Status (1)

Country Link
JP (1) JPS57116311A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950671A (en) * 1982-09-16 1984-03-23 Olympus Optical Co Ltd Method for displaying focus information of television camera or the like
JPS5967505A (en) * 1982-10-12 1984-04-17 Asahi Optical Co Ltd Automatic focusing device of video camera
JPS60183877A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPS60183878A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPH01230012A (en) * 1988-03-10 1989-09-13 Fuji Photo Film Co Ltd Automatic focusing device
USRE35409E (en) * 1982-09-24 1996-12-24 Moore; Sidney D. Electrically addressable opto-electronic indicator for making dynamic evaluations of microscopic or larger subjects

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5950671A (en) * 1982-09-16 1984-03-23 Olympus Optical Co Ltd Method for displaying focus information of television camera or the like
JPH0548028B2 (en) * 1982-09-16 1993-07-20 Olympus Optical Co
USRE35409E (en) * 1982-09-24 1996-12-24 Moore; Sidney D. Electrically addressable opto-electronic indicator for making dynamic evaluations of microscopic or larger subjects
JPS5967505A (en) * 1982-10-12 1984-04-17 Asahi Optical Co Ltd Automatic focusing device of video camera
JPS60183877A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPS60183878A (en) * 1984-03-02 1985-09-19 Canon Inc Focus detector
JPH01230012A (en) * 1988-03-10 1989-09-13 Fuji Photo Film Co Ltd Automatic focusing device

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