JPS6481925A - Finder optical system capable of diopter adjustment - Google Patents
Finder optical system capable of diopter adjustmentInfo
- 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
Links
Landscapes
- 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.
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)
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 |
-
1987
- 1987-09-24 JP JP62239796A patent/JP2503531B2/en not_active Expired - Fee Related
Cited By (6)
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 |