JPS5632113A - Focusing detector - Google Patents

Focusing detector

Info

Publication number
JPS5632113A
JPS5632113A JP10847879A JP10847879A JPS5632113A JP S5632113 A JPS5632113 A JP S5632113A JP 10847879 A JP10847879 A JP 10847879A JP 10847879 A JP10847879 A JP 10847879A JP S5632113 A JPS5632113 A JP S5632113A
Authority
JP
Japan
Prior art keywords
focusing
outputs
output
respective photodetectors
differential detector
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
JP10847879A
Other languages
Japanese (ja)
Inventor
Toshitatsu Suzuki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP10847879A priority Critical patent/JPS5632113A/en
Publication of JPS5632113A publication Critical patent/JPS5632113A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To enable focusing to be performed accurately irrespective of the space frequencies of the subject by constituting the specified circuits in such a manner that the focusing is determined by the extreme value of the sum of the absolute value of the difference between the output mean value of the photodetector group for focusing detecting and the outputs of the respective photodetectors.
CONSTITUTION: A photodetector group PSA is placed on the imaging film plane of a taking optical system or in a position equivalent to this. The outputs s1Wsn from the respective photodetectors are subjected to addition averaging operations, and the mean output Si inputs to a differential detector DIF. On the other hand, the outputs s1Wsn of the respective photodetectors inputting to the differential detector DIF are adjusted to suitable values with an amplifier AMP. The differential outputs u1Wun between Si and of the differential detector and s1Wsn are added in an adder ADD via a rectifier PCT, whereby an output Z is obtained. The focusing position is obtained in the position where Z assumes an extreme value when the taking optical system is displaced. Thereby, the focusing may be made accurately irrespective of the space frequencies of the subject.
COPYRIGHT: (C)1981,JPO&Japio
JP10847879A 1979-08-25 1979-08-25 Focusing detector Pending JPS5632113A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10847879A JPS5632113A (en) 1979-08-25 1979-08-25 Focusing detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10847879A JPS5632113A (en) 1979-08-25 1979-08-25 Focusing detector

Publications (1)

Publication Number Publication Date
JPS5632113A true JPS5632113A (en) 1981-04-01

Family

ID=14485765

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10847879A Pending JPS5632113A (en) 1979-08-25 1979-08-25 Focusing detector

Country Status (1)

Country Link
JP (1) JPS5632113A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63121566U (en) * 1987-02-02 1988-08-08

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63121566U (en) * 1987-02-02 1988-08-08

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