JPS54121121A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS54121121A
JPS54121121A JP2779178A JP2779178A JPS54121121A JP S54121121 A JPS54121121 A JP S54121121A JP 2779178 A JP2779178 A JP 2779178A JP 2779178 A JP2779178 A JP 2779178A JP S54121121 A JPS54121121 A JP S54121121A
Authority
JP
Japan
Prior art keywords
detectors
subject
constitution
concave
behind
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
JP2779178A
Other languages
Japanese (ja)
Inventor
Kenichi Oikami
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 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 Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP2779178A priority Critical patent/JPS54121121A/en
Publication of JPS54121121A publication Critical patent/JPS54121121A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To make the constitution of a focus detector simple by alternately applying the incident light from the same region of the subject to detectors which are provided in the positions optically equivalent to before and behind the intended focal plane.
CONSTITUTION: Concave and convex parts 10, 11 are formed in the focusing screen 5 in observation optical system and the installation positions of the light intensity detectors 8, 9 opposing to these concave and convex parts become optically equivalent to before and behind the intended focal plane. Hence, if the subject light from the same region of the subject is entered to the detectors 8, 9 through fine vibration or the like of a mirror 2, the focusing is detected when the detection outputs of the detectors 8, 9 become equal.
COPYRIGHT: (C)1979,JPO&Japio
JP2779178A 1978-03-13 1978-03-13 Focus detector Pending JPS54121121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2779178A JPS54121121A (en) 1978-03-13 1978-03-13 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2779178A JPS54121121A (en) 1978-03-13 1978-03-13 Focus detector

Publications (1)

Publication Number Publication Date
JPS54121121A true JPS54121121A (en) 1979-09-20

Family

ID=12230788

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2779178A Pending JPS54121121A (en) 1978-03-13 1978-03-13 Focus detector

Country Status (1)

Country Link
JP (1) JPS54121121A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63303578A (en) * 1987-06-04 1988-12-12 Fuji Photo Film Co Ltd Compact camera with focusing mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63303578A (en) * 1987-06-04 1988-12-12 Fuji Photo Film Co Ltd Compact camera with focusing mechanism

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