JPS6481925A - Finder optical system capable of diopter adjustment - Google Patents

Finder optical system capable of diopter adjustment

Info

Publication number
JPS6481925A
JPS6481925A JP62239796A JP23979687A JPS6481925A JP S6481925 A JPS6481925 A JP S6481925A JP 62239796 A JP62239796 A JP 62239796A JP 23979687 A JP23979687 A JP 23979687A JP S6481925 A JPS6481925 A JP S6481925A
Authority
JP
Japan
Prior art keywords
lens
ocular
constitution
diopter adjustment
lenses
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
JP62239796A
Other languages
Japanese (ja)
Other versions
JP2503531B2 (en
Inventor
Daijiro Fujie
Masaaki Yanagisawa
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.)
Nikon Corp
Original Assignee
Nikon Corp
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 Nikon Corp filed Critical Nikon Corp
Priority to JP62239796A priority Critical patent/JP2503531B2/en
Publication of JPS6481925A publication Critical patent/JPS6481925A/en
Application granted granted Critical
Publication of JP2503531B2 publication Critical patent/JP2503531B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Lenses (AREA)

Abstract

PURPOSE:To simplify the constitution and to improve the image performance by fixing 1st and 3rd lenses among three lenses constituting an ocular and moving a 2nd lens in the direction of the optical axis for diopter adjustment, and satisfying specific conditions. CONSTITUTION:The ocular L has the 1st negative lens L1, the 2nd positive lens L2, and the 3rd negative lens L3 in order from an observing eye side and the 2nd lens L2 is moved in the optical axis direction while the 1st and 3rd lenses are fixed, thereby performing the diopter adjustment. Then an inequality I holds. In the inequality I, f2 is the focal length of the 2nd lens L2, (f) the focal length of the whole finder system at the time of 0 diopter, N2 the refractive index of the 2nd lens L2, SF0 a shape factor showing the shape of the whole lens, r1 the radius of curvature of the lens surface of the ocular closest to the observing eye side, and r6 the radius of curvature of the lens surface closest to a focal plate side, so that expressions II hold. Consequently, the constitution is simplified and the image performance is improved.
JP62239796A 1987-09-24 1987-09-24 Finder optical system with adjustable diopter Expired - Fee Related JP2503531B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62239796A JP2503531B2 (en) 1987-09-24 1987-09-24 Finder optical system with adjustable diopter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62239796A JP2503531B2 (en) 1987-09-24 1987-09-24 Finder optical system with adjustable diopter

Publications (2)

Publication Number Publication Date
JPS6481925A true JPS6481925A (en) 1989-03-28
JP2503531B2 JP2503531B2 (en) 1996-06-05

Family

ID=17049999

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62239796A Expired - Fee Related JP2503531B2 (en) 1987-09-24 1987-09-24 Finder optical system with adjustable diopter

Country Status (1)

Country Link
JP (1) JP2503531B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446590A (en) * 1992-07-08 1995-08-29 Olympus Optical Co., Ltd. High eye point type viewfinder optical system
JP2008052085A (en) * 2006-08-25 2008-03-06 Nikon Corp Eyepiece lens and finder optical system having the same and optical apparatus
JP2014115451A (en) * 2012-12-10 2014-06-26 Canon Inc Finder optical system and image capturing device
JP2020194127A (en) * 2019-05-29 2020-12-03 富士フイルム株式会社 Viewfinder and image capturing device
CN115857156A (en) * 2023-02-28 2023-03-28 中山市美景光学信息有限公司 Long-focus eyepiece optical system capable of reducing visibility adjustment range

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5446590A (en) * 1992-07-08 1995-08-29 Olympus Optical Co., Ltd. High eye point type viewfinder optical system
JP2008052085A (en) * 2006-08-25 2008-03-06 Nikon Corp Eyepiece lens and finder optical system having the same and optical apparatus
JP2014115451A (en) * 2012-12-10 2014-06-26 Canon Inc Finder optical system and image capturing device
JP2020194127A (en) * 2019-05-29 2020-12-03 富士フイルム株式会社 Viewfinder and image capturing device
US11546493B2 (en) 2019-05-29 2023-01-03 Fujifilm Corporation Finder and imaging device
CN115857156A (en) * 2023-02-28 2023-03-28 中山市美景光学信息有限公司 Long-focus eyepiece optical system capable of reducing visibility adjustment range

Also Published As

Publication number Publication date
JP2503531B2 (en) 1996-06-05

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees