JPS57161713A - Focusing detector - Google Patents

Focusing detector

Info

Publication number
JPS57161713A
JPS57161713A JP4609581A JP4609581A JPS57161713A JP S57161713 A JPS57161713 A JP S57161713A JP 4609581 A JP4609581 A JP 4609581A JP 4609581 A JP4609581 A JP 4609581A JP S57161713 A JPS57161713 A JP S57161713A
Authority
JP
Japan
Prior art keywords
memory
stored
photodetector
light
selectively
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.)
Granted
Application number
JP4609581A
Other languages
Japanese (ja)
Other versions
JPH0113083B2 (en
Inventor
Masahiro Aoki
Kenichi Oikami
Masatoshi Ida
Asao Hayashi
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.)
Olympus Corp
Original Assignee
Olympus Corp
Olympus Optical 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 Olympus Corp, Olympus Optical Co Ltd filed Critical Olympus Corp
Priority to JP4609581A priority Critical patent/JPS57161713A/en
Publication of JPS57161713A publication Critical patent/JPS57161713A/en
Publication of JPH0113083B2 publication Critical patent/JPH0113083B2/ja
Granted 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)
  • Automatic Focus Adjustment (AREA)
  • Focusing (AREA)

Abstract

PURPOSE:To achieve high-precision focusing detection all the time with regard to a low-contrast object, by correcting characteristic variance among photoelectric converting circuits. CONSTITUTION:A means 31 of cutting off light incident to a photodetector 2 selectively and a means 32 of lighting the photodetector 2 selectively and uniformly are provided between an optical system 1 and the photodetector 2, and corrected value memories 33 and 34 are provided in parallel to a digital memory 4. Then, when the incident light is cut off, photoelectric outputs are converted by an A/D converter 3 and stored in the memory 33 as dark value data. Further, photoelectric outputs in a lighting state are stored in the memory 34 as light value data. On the basis of those stored data, a digigal signal which corresponds to the light intensity distribution of an object image stored in the memory 4 is corrected to detect the focusing state of the object image.
JP4609581A 1981-03-28 1981-03-28 Focusing detector Granted JPS57161713A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4609581A JPS57161713A (en) 1981-03-28 1981-03-28 Focusing detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4609581A JPS57161713A (en) 1981-03-28 1981-03-28 Focusing detector

Publications (2)

Publication Number Publication Date
JPS57161713A true JPS57161713A (en) 1982-10-05
JPH0113083B2 JPH0113083B2 (en) 1989-03-03

Family

ID=12737424

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4609581A Granted JPS57161713A (en) 1981-03-28 1981-03-28 Focusing detector

Country Status (1)

Country Link
JP (1) JPS57161713A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6086409A (en) * 1983-10-18 1985-05-16 Canon Inc Range finder

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50159216A (en) * 1974-06-12 1975-12-23
JPS5145556A (en) * 1974-10-17 1976-04-19 Ricoh Kk Kyorikenshutsu hoho oyobi sochi
JPS5432013A (en) * 1977-08-15 1979-03-09 Nec Corp Picture element correction system for image sensor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50159216A (en) * 1974-06-12 1975-12-23
JPS5145556A (en) * 1974-10-17 1976-04-19 Ricoh Kk Kyorikenshutsu hoho oyobi sochi
JPS5432013A (en) * 1977-08-15 1979-03-09 Nec Corp Picture element correction system for image sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6086409A (en) * 1983-10-18 1985-05-16 Canon Inc Range finder

Also Published As

Publication number Publication date
JPH0113083B2 (en) 1989-03-03

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