JPS57158818A - Method and device for focus detection - Google Patents

Method and device for focus detection

Info

Publication number
JPS57158818A
JPS57158818A JP4417981A JP4417981A JPS57158818A JP S57158818 A JPS57158818 A JP S57158818A JP 4417981 A JP4417981 A JP 4417981A JP 4417981 A JP4417981 A JP 4417981A JP S57158818 A JPS57158818 A JP S57158818A
Authority
JP
Japan
Prior art keywords
circuit
photodetector arrays
memories
circuits
supplied
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
JP4417981A
Other languages
Japanese (ja)
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 JP4417981A priority Critical patent/JPS57158818A/en
Publication of JPS57158818A publication Critical patent/JPS57158818A/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

Landscapes

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

Abstract

PURPOSE:To discrminate the focusing state, by detecting the quantity of lateral deviation of an object image by the operation processing of picture information from a pair of photodetector arrays to discriminate an approximate focusing state and detecting next degree of blur of the object image. CONSTITUTION:When photodetector arrays 23 and 24 are selected by a selecting circuit 30, illuminance information of two photodetectors are sampled and held by circuits 32-1-32-2n. The digital signal from a circuit 31 is subjected to D/A conversion in a D/A converter 33 and is supplied to comparators 35-1-35-2n. This converted signal is compared with values of analogue signals of circuits 32-1-32-2n. Comparison outputs are supplied to memories 34-1-34-2n, and digital signal is stored when the comparison output is inverted. After that, the circuit 31 reads out illuminance information of respective photodetectors in memories 34-1-34-2n through an address bus 36 and a decorder 37 to operate the quantity of lateral deviation. For the focus, photodetector arrays 15 and 16 are selected by the circuit 31, and a focus detection signal is obtained in the blurred image detection system.
JP4417981A 1981-03-27 1981-03-27 Method and device for focus detection Pending JPS57158818A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4417981A JPS57158818A (en) 1981-03-27 1981-03-27 Method and device for focus detection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4417981A JPS57158818A (en) 1981-03-27 1981-03-27 Method and device for focus detection

Publications (1)

Publication Number Publication Date
JPS57158818A true JPS57158818A (en) 1982-09-30

Family

ID=12684346

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4417981A Pending JPS57158818A (en) 1981-03-27 1981-03-27 Method and device for focus detection

Country Status (1)

Country Link
JP (1) JPS57158818A (en)

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