JPS5587115A - Focus detector - Google Patents

Focus detector

Info

Publication number
JPS5587115A
JPS5587115A JP16415378A JP16415378A JPS5587115A JP S5587115 A JPS5587115 A JP S5587115A JP 16415378 A JP16415378 A JP 16415378A JP 16415378 A JP16415378 A JP 16415378A JP S5587115 A JPS5587115 A JP S5587115A
Authority
JP
Japan
Prior art keywords
prism
photo detector
focus
auxiliary lens
image
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
JP16415378A
Other languages
Japanese (ja)
Inventor
Kazuji Hiyakumura
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 JP16415378A priority Critical patent/JPS5587115A/en
Publication of JPS5587115A publication Critical patent/JPS5587115A/en
Pending legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE: To improve focus detection accuracy by so constituting the device that a photo detecting element and the subject are positioned in a conjugate or equivalent relation.
CONSTITUTION: A photographing lens 5, split image prism 6, auxiliary lens 7 and photo detector 8 are arrayed in a coaxial relation and the focal plane SS' of the prism 6 are in the positions optically equivalent to the film plane. The auxiliary lens 7 is movable on the optical axis and the photo detector 8 is constituted by the two portions 8A, 8B sandwiching the straight line EE' parallel with the boundary line of the prism 6. Now, when the subject image is formed on the focal plane SS', the split image prism 6 does not move the image to the two portions of P1 and P2 and therefore the movement amount d of the images P1', P2' on the photo detector 8 becomes 0 and this point is a focus. At the same time, the photo detector 8 and auxiliary lens 7 has the function as a contrast detection type focus detector as well and therefore the focus detection accuracy may be improved.
COPYRIGHT: (C)1980,JPO&Japio
JP16415378A 1978-12-25 1978-12-25 Focus detector Pending JPS5587115A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16415378A JPS5587115A (en) 1978-12-25 1978-12-25 Focus detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16415378A JPS5587115A (en) 1978-12-25 1978-12-25 Focus detector

Publications (1)

Publication Number Publication Date
JPS5587115A true JPS5587115A (en) 1980-07-01

Family

ID=15787738

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16415378A Pending JPS5587115A (en) 1978-12-25 1978-12-25 Focus detector

Country Status (1)

Country Link
JP (1) JPS5587115A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5897012A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focus detector
JPS5897011A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focusing detecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5897012A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focus detector
JPS5897011A (en) * 1981-12-07 1983-06-09 Olympus Optical Co Ltd Focusing detecting method

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