GB219406A - Improvements in method and means for focussing lenses - Google Patents
Improvements in method and means for focussing lensesInfo
- Publication number
- GB219406A GB219406A GB1135723A GB1135723A GB219406A GB 219406 A GB219406 A GB 219406A GB 1135723 A GB1135723 A GB 1135723A GB 1135723 A GB1135723 A GB 1135723A GB 219406 A GB219406 A GB 219406A
- Authority
- GB
- United Kingdom
- Prior art keywords
- operating
- lenses
- threads
- screw
- carriages
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Automatic Focus Adjustment (AREA)
- Focusing (AREA)
- Lens Barrels (AREA)
Abstract
219,406. Webster, A. W., and Kapella, Ltd. April 27, 1023. Finders.-Apparatus for focusing simultaneously two or more lenses of different focal length by mechanism involving the use of screw threads of different pitch comprises an operating - member rotatably mounted on a support, a carriage for each lens hava peripheral surface engaging the operating-member, and screw-threads of different pitch on these surfaces, engaging screw-threads on the operating-member, for displacing the lenses simultaneously when the operating-member is rotated. In the form shown, lenses B, C are mounted in carriages D, E, threaded into a rotary sleeve G, which is in turn threaded into a fixed flange A, and carries an operating-handle. A feather F prevents rotation of the carriages D, E with respect to the flange A. The pitch and hand of the various screw-threads are chosen to produce differential axial movement of the lenses according to their focal lengths. Multiple screwthreads may be employed if rapid axial movement is desired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1135723A GB219406A (en) | 1923-04-27 | 1923-04-27 | Improvements in method and means for focussing lenses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1135723A GB219406A (en) | 1923-04-27 | 1923-04-27 | Improvements in method and means for focussing lenses |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB219406A true GB219406A (en) | 1924-07-28 |
Family
ID=9984759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1135723A Expired GB219406A (en) | 1923-04-27 | 1923-04-27 | Improvements in method and means for focussing lenses |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB219406A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6777939B2 (en) | 2002-02-27 | 2004-08-17 | Siemens Aktiengesellschaft | Coil system with current regulation based on emitted heat |
-
1923
- 1923-04-27 GB GB1135723A patent/GB219406A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6777939B2 (en) | 2002-02-27 | 2004-08-17 | Siemens Aktiengesellschaft | Coil system with current regulation based on emitted heat |
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