JPS5481838A - Zoom lens structure - Google Patents
Zoom lens structureInfo
- Publication number
- JPS5481838A JPS5481838A JP13957478A JP13957478A JPS5481838A JP S5481838 A JPS5481838 A JP S5481838A JP 13957478 A JP13957478 A JP 13957478A JP 13957478 A JP13957478 A JP 13957478A JP S5481838 A JPS5481838 A JP S5481838A
- Authority
- JP
- Japan
- Prior art keywords
- optical axis
- cam ring
- cam
- ring
- 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.)
- Pending
Links
Landscapes
- Lens Barrels (AREA)
Abstract
PURPOSE: To ensure the smooth rotation of a cam ring, properly control it in the direction of an optical axis, and make it possible to effectively eliminate the looseness in the direction of the optical axis by providing a means for energizing the cam ring in the one direction along the optical axis.
CONSTITUTION: Cam ring 17 is provided with cam groove along which the lens L2 of variable magnification system and the lens L3 of correction system are caused to move along the optical axis under the predetermined relationship for the purpose of zooming. Thus, with the rotation of the cam ring 17, the lenses L2 and L3 are moved by the action of the cam groove so as to do zooming. The cam ring 17 is smoothly rotated in the direction of the optical axis with no trouble due to looseness by the action of ring wave spring plate 18 disposed between stepped portion 1c of the firmly fixed lens barrel 1 and the end face of the cam ring 17, hence the stable zoom operation can be done.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13957478A JPS5481838A (en) | 1978-11-13 | 1978-11-13 | Zoom lens structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13957478A JPS5481838A (en) | 1978-11-13 | 1978-11-13 | Zoom lens structure |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9098271A Division JPS5630528B2 (en) | 1971-11-13 | 1971-11-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5481838A true JPS5481838A (en) | 1979-06-29 |
Family
ID=15248425
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13957478A Pending JPS5481838A (en) | 1978-11-13 | 1978-11-13 | Zoom lens structure |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5481838A (en) |
-
1978
- 1978-11-13 JP JP13957478A patent/JPS5481838A/en active Pending
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