JPS54139726A - Preventing method and apparatus for malfunction of auto focus system - Google Patents

Preventing method and apparatus for malfunction of auto focus system

Info

Publication number
JPS54139726A
JPS54139726A JP4719478A JP4719478A JPS54139726A JP S54139726 A JPS54139726 A JP S54139726A JP 4719478 A JP4719478 A JP 4719478A JP 4719478 A JP4719478 A JP 4719478A JP S54139726 A JPS54139726 A JP S54139726A
Authority
JP
Japan
Prior art keywords
scanning
value
signal
photo detecting
malfunction
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
JP4719478A
Other languages
Japanese (ja)
Inventor
Tsuneaki Kadosawa
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.)
Fujinon Corp
Original Assignee
Fuji Photo 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 Fuji Photo Optical Co Ltd filed Critical Fuji Photo Optical Co Ltd
Priority to JP4719478A priority Critical patent/JPS54139726A/en
Publication of JPS54139726A publication Critical patent/JPS54139726A/en
Pending legal-status Critical Current

Links

Landscapes

  • Focusing (AREA)
  • Automatic Focus Adjustment (AREA)

Abstract

PURPOSE: To enable smooth and accurate focusing to be performed by preventing a distance control lens from making hunting form movement owing to once or more appearance of the extremal value and malfunction of module, etc.
CONSTITUTION: This measures distances by receiving the field light from a scanning mirror 1 in a photo detecting part, receiving the field light from a stationary mirror in a photo detecting part 4 and measuring the correlations in the respective photo detecting parts wherein the maximum extremal value of the correlation signals is stored and held in a holding circuit 9 at the scanning in one direction of the scanning mirror 1, the level signal which has been set at a value lower by the specified level determined from the maximum extremal value having been thus stored and held, by taking S/N, etc. into consideration, at the scanning in the opposite direction, and the correlation signal at the scanning in the opposite direction are compared in a comparator 11, and arrangement is so made that a distance signal is transmitted only when the times of taking the value higher than the level signal toward the correlation signal are once and no distance is transmitted when they are zero or twice or more.
COPYRIGHT: (C)1979,JPO&Japio
JP4719478A 1978-04-22 1978-04-22 Preventing method and apparatus for malfunction of auto focus system Pending JPS54139726A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4719478A JPS54139726A (en) 1978-04-22 1978-04-22 Preventing method and apparatus for malfunction of auto focus system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4719478A JPS54139726A (en) 1978-04-22 1978-04-22 Preventing method and apparatus for malfunction of auto focus system

Publications (1)

Publication Number Publication Date
JPS54139726A true JPS54139726A (en) 1979-10-30

Family

ID=12768299

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4719478A Pending JPS54139726A (en) 1978-04-22 1978-04-22 Preventing method and apparatus for malfunction of auto focus system

Country Status (1)

Country Link
JP (1) JPS54139726A (en)

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