JPS5538559A - Variable focal length lens system of optical correction type - Google Patents
Variable focal length lens system of optical correction typeInfo
- Publication number
- JPS5538559A JPS5538559A JP11201978A JP11201978A JPS5538559A JP S5538559 A JPS5538559 A JP S5538559A JP 11201978 A JP11201978 A JP 11201978A JP 11201978 A JP11201978 A JP 11201978A JP S5538559 A JPS5538559 A JP S5538559A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- positive
- negative
- focal length
- lens groups
- 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 an inexpensive variable focal length lens system, by making the shift of focus sufficiently smaller than the depth of focus by using a single independent moving method without use of cam, and withholding the shift of focus to a completely negligible extent.
CONSTITUTION: The system is constituted with five lens groups, positive, negative, positive, negative, and positive, from the object side. The first, third, and fifth positive lens groups are secured, while the second and fourth negative lens groups are housed in a common lens barrel, and are moved in the same direction by the same distance to vary the focal length. By constituting the first to fourth lens groups with at least one negative lens and at least one positive lens, chromatic aberration is corrected within each lens group. The first and third lens groups should be the lens groups having positive focal length with negative meniscus lens and positive lens, and the second and fourth lens groups should be lens groups having negative focal length with double-concave negative lens and positive meniscus lens. By disposing at least two positive lenses on the object side of the fifth lens group, fluctuation and increase of spherical aberration due to variation of focal lengths may be prevented.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53112019A JPS5833529B2 (en) | 1978-09-12 | 1978-09-12 | Optically corrected variable focal length lens system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53112019A JPS5833529B2 (en) | 1978-09-12 | 1978-09-12 | Optically corrected variable focal length lens system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5538559A true JPS5538559A (en) | 1980-03-18 |
| JPS5833529B2 JPS5833529B2 (en) | 1983-07-20 |
Family
ID=14575938
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53112019A Expired JPS5833529B2 (en) | 1978-09-12 | 1978-09-12 | Optically corrected variable focal length lens system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5833529B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5847882A (en) * | 1994-06-23 | 1998-12-08 | Canon Kabushiki Kaisha | Rear focusing zoom lens |
| JP2011069959A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device using the same |
| JP2011069957A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device |
| CN112859319A (en) * | 2021-02-22 | 2021-05-28 | 中科院南京天文仪器有限公司 | Large-caliber wide-spectrum coaxial bidirectional layout telescope optical system |
| JP2022055484A (en) * | 2020-09-29 | 2022-04-08 | 株式会社タムロン | Zoom lens and imaging device |
-
1978
- 1978-09-12 JP JP53112019A patent/JPS5833529B2/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5847882A (en) * | 1994-06-23 | 1998-12-08 | Canon Kabushiki Kaisha | Rear focusing zoom lens |
| US6094312A (en) * | 1994-06-23 | 2000-07-25 | Canon Kabushiki Kaisha | Rear focusing zoom lens |
| JP2011069959A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device using the same |
| JP2011069957A (en) * | 2009-09-25 | 2011-04-07 | Casio Computer Co Ltd | Zoom lens and projection type display device |
| JP2022055484A (en) * | 2020-09-29 | 2022-04-08 | 株式会社タムロン | Zoom lens and imaging device |
| CN112859319A (en) * | 2021-02-22 | 2021-05-28 | 中科院南京天文仪器有限公司 | Large-caliber wide-spectrum coaxial bidirectional layout telescope optical system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5833529B2 (en) | 1983-07-20 |
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