JPS5596915A - Compact large aperture ratio lens - Google Patents
Compact large aperture ratio lensInfo
- Publication number
- JPS5596915A JPS5596915A JP455079A JP455079A JPS5596915A JP S5596915 A JPS5596915 A JP S5596915A JP 455079 A JP455079 A JP 455079A JP 455079 A JP455079 A JP 455079A JP S5596915 A JPS5596915 A JP S5596915A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- object side
- focal length
- curvature
- directed
- 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 obtain the compact photographic lens of a short overall length by specifically arranging lenses of 4 groups and 4 elements.
CONSTITUTION: The 1st lens composed of a positive meniscus lens whose convex face is directed to the object side, 2nd lens consisting of a biconcave lens, 3rd lens consisting of a positive lens and 4th lens consisting of a positive meniscus lens whose convex face is directed to the object side, subsequently from the object side are so arranged as to satisfy formulas 1W6 where f is let the combined focal length of the entire lens system, f1 the focal length of the 1st lens, ri the radius of curvature of the (i)th face and ni the refractive index of the (i)th lens with respect to the d line. As a result of this, the spherical aberrations as the entire system are balanced and in addition it is avoided to become extremely small radius of curvature at the time of practical focal length, thus the flare of the spherical aberrations and comatic aberrations is corrected.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP455079A JPS5596915A (en) | 1979-01-18 | 1979-01-18 | Compact large aperture ratio lens |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP455079A JPS5596915A (en) | 1979-01-18 | 1979-01-18 | Compact large aperture ratio lens |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5596915A true JPS5596915A (en) | 1980-07-23 |
JPS6363881B2 JPS6363881B2 (en) | 1988-12-08 |
Family
ID=11587151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP455079A Granted JPS5596915A (en) | 1979-01-18 | 1979-01-18 | Compact large aperture ratio lens |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5596915A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6140616A (en) * | 1984-07-31 | 1986-02-26 | Fanuc Ltd | Position control system |
JPH01309014A (en) * | 1988-06-07 | 1989-12-13 | Asahi Optical Co Ltd | Front stop projection lens |
JPH02137812A (en) * | 1988-11-18 | 1990-05-28 | Olympus Optical Co Ltd | Photographic lens |
US7206143B2 (en) | 2003-05-13 | 2007-04-17 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
-
1979
- 1979-01-18 JP JP455079A patent/JPS5596915A/en active Granted
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6140616A (en) * | 1984-07-31 | 1986-02-26 | Fanuc Ltd | Position control system |
JPH01309014A (en) * | 1988-06-07 | 1989-12-13 | Asahi Optical Co Ltd | Front stop projection lens |
JPH02137812A (en) * | 1988-11-18 | 1990-05-28 | Olympus Optical Co Ltd | Photographic lens |
US7206143B2 (en) | 2003-05-13 | 2007-04-17 | Olympus Corporation | Image-formation optical system, and imaging system incorporating the same |
Also Published As
Publication number | Publication date |
---|---|
JPS6363881B2 (en) | 1988-12-08 |
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