JPS5635116A - Telephoto lens - Google Patents
Telephoto lensInfo
- Publication number
- JPS5635116A JPS5635116A JP1840680A JP1840680A JPS5635116A JP S5635116 A JPS5635116 A JP S5635116A JP 1840680 A JP1840680 A JP 1840680A JP 1840680 A JP1840680 A JP 1840680A JP S5635116 A JPS5635116 A JP S5635116A
- Authority
- JP
- Japan
- Prior art keywords
- group
- converging
- diverging
- decrease
- telephoto lens
- 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 decrease the aberration fluctuations in near distances by forming an afocal system to infinite objects with the 1st converging group and the 2nd diverging group, and performing focusing through retreating of the 2nd diverging group with the 1st and 3rd converging groups in a stationary state.
CONSTITUTION: The lens is constituted by the 1st converging group, the 2nd diverging group and the 3rd converging group, and nearly an afocal system for infinite objects is formed with the 1st converging group and the 2nd diverging group. The relation shown by the formula 1 is provided to the focal lengths of the entire system and the respective groups. Since this is a telephoto lens, F>f1 is satisfied; moreover, in order to decrease the extent of movement for the purpose of focusing of the 2nd group, |f2|<f3 is satisfied. Further, the radii of curvature are made to satisfy the formulas (2)W(4), respectively, in order to decrease the flucuations in aberration owing to the retraction of the 2nd group. In this way, the telephoto lens of a small size, superior operating characteristic and high performance may be obtained. (F denotes the focal length of the entire system, fn the focal length of each group and rn the radius of curvature.)
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1840680A JPS5834810B2 (en) | 1980-02-16 | 1980-02-16 | telescope lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1840680A JPS5834810B2 (en) | 1980-02-16 | 1980-02-16 | telescope lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5635116A true JPS5635116A (en) | 1981-04-07 |
| JPS5834810B2 JPS5834810B2 (en) | 1983-07-29 |
Family
ID=11970780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1840680A Expired JPS5834810B2 (en) | 1980-02-16 | 1980-02-16 | telescope lens |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5834810B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828710A (en) * | 1981-08-14 | 1983-02-19 | Olympus Optical Co Ltd | Telephoto lens of large aperture ratio |
| JPS5878423U (en) * | 1981-11-21 | 1983-05-27 | ダイキン工業株式会社 | ventilation system |
| JPS59116709A (en) * | 1982-12-24 | 1984-07-05 | Olympus Optical Co Ltd | Focusing system of telephotolens |
| JPS6028612A (en) * | 1983-07-27 | 1985-02-13 | Nippon Kogaku Kk <Nikon> | High-aperture ratio telephoto lens |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06312820A (en) * | 1992-06-30 | 1994-11-08 | Akio Oguchi | Pulley for stretching endless belt |
| JPH0719226U (en) * | 1993-09-17 | 1995-04-07 | 岐建木村株式会社 | belt conveyor |
-
1980
- 1980-02-16 JP JP1840680A patent/JPS5834810B2/en not_active Expired
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5828710A (en) * | 1981-08-14 | 1983-02-19 | Olympus Optical Co Ltd | Telephoto lens of large aperture ratio |
| JPS6355044B2 (en) * | 1981-08-14 | 1988-11-01 | Olympus Optical Co | |
| JPS5878423U (en) * | 1981-11-21 | 1983-05-27 | ダイキン工業株式会社 | ventilation system |
| JPS59116709A (en) * | 1982-12-24 | 1984-07-05 | Olympus Optical Co Ltd | Focusing system of telephotolens |
| JPH0542643B2 (en) * | 1982-12-24 | 1993-06-29 | Olympus Optical Co | |
| JPS6028612A (en) * | 1983-07-27 | 1985-02-13 | Nippon Kogaku Kk <Nikon> | High-aperture ratio telephoto lens |
| JPH0412443B2 (en) * | 1983-07-27 | 1992-03-04 | Nippon Kogaku Kk |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5834810B2 (en) | 1983-07-29 |
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