JPS57201214A - Diopter adjustable finder optical system - Google Patents

Diopter adjustable finder optical system

Info

Publication number
JPS57201214A
JPS57201214A JP8618981A JP8618981A JPS57201214A JP S57201214 A JPS57201214 A JP S57201214A JP 8618981 A JP8618981 A JP 8618981A JP 8618981 A JP8618981 A JP 8618981A JP S57201214 A JPS57201214 A JP S57201214A
Authority
JP
Japan
Prior art keywords
lens group
positive
optical system
lens
finder optical
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.)
Granted
Application number
JP8618981A
Other languages
Japanese (ja)
Other versions
JPS6119968B2 (en
Inventor
Kikuo Momiyama
Hiroki Someya
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP8618981A priority Critical patent/JPS57201214A/en
Priority to US06/375,302 priority patent/US4664485A/en
Publication of JPS57201214A publication Critical patent/JPS57201214A/en
Publication of JPS6119968B2 publication Critical patent/JPS6119968B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B25/00—Eyepieces; Magnifying glasses
    • G02B25/001—Eyepieces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/14—Viewfinders

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Viewfinders (AREA)
  • Telescopes (AREA)
  • Lenses (AREA)

Abstract

PURPOSE:To obtain a finder optical system which is provided with a diopter adjustable eyepiece and has aberrations corrected well, by constituting the eyepiece with lenses of 3 groups, namely, positive, negative, and positive groups arranged in order form the side of a pentagonal roof prism and satisfying prescribed conditions. CONSTITUTION:A finder optical system consists of a focus plate 1, a condenser lens 2, a roof prism 3, a positive first lens group 4, a negative second lens group 5, a positive third lens group 6, and an eye point 7, and the first lens group 4 and the second lens group 5 are fixed, and the second lens group 6 is moved on the optical axis to adjust the diopter. When focal lengths of the first and the third lens groups are denoted as f1 and f3, respectively, f1>f3 is satisfied to correct aberrations well. Further, when radiuses of curvatures of respective lens surfaces of the third lens group 6 are denoted as R11 and R12 in order from the roof prism side, R11<¦R12¦and R12<0 are satisfied to correct aberrations better.
JP8618981A 1981-05-20 1981-06-04 Diopter adjustable finder optical system Granted JPS57201214A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP8618981A JPS57201214A (en) 1981-06-04 1981-06-04 Diopter adjustable finder optical system
US06/375,302 US4664485A (en) 1981-05-20 1982-05-05 Finder optical system for a camera

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8618981A JPS57201214A (en) 1981-06-04 1981-06-04 Diopter adjustable finder optical system

Publications (2)

Publication Number Publication Date
JPS57201214A true JPS57201214A (en) 1982-12-09
JPS6119968B2 JPS6119968B2 (en) 1986-05-20

Family

ID=13879817

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8618981A Granted JPS57201214A (en) 1981-05-20 1981-06-04 Diopter adjustable finder optical system

Country Status (1)

Country Link
JP (1) JPS57201214A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04176405A (en) * 1990-11-13 1992-06-24 Nobuyo Sakai Personal secret case
US6424468B1 (en) * 2000-09-05 2002-07-23 Nikon Corporation Eyepiece lens
RU2601244C2 (en) * 2013-09-09 2016-10-27 Кэнон Кабусики Кайся Eyepiece and viewing device, having eyepiece

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04176405A (en) * 1990-11-13 1992-06-24 Nobuyo Sakai Personal secret case
US6424468B1 (en) * 2000-09-05 2002-07-23 Nikon Corporation Eyepiece lens
RU2601244C2 (en) * 2013-09-09 2016-10-27 Кэнон Кабусики Кайся Eyepiece and viewing device, having eyepiece

Also Published As

Publication number Publication date
JPS6119968B2 (en) 1986-05-20

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