GB218763A - Improvements in projection apparatus - Google Patents
Improvements in projection apparatusInfo
- Publication number
- GB218763A GB218763A GB1044423A GB1044423A GB218763A GB 218763 A GB218763 A GB 218763A GB 1044423 A GB1044423 A GB 1044423A GB 1044423 A GB1044423 A GB 1044423A GB 218763 A GB218763 A GB 218763A
- Authority
- GB
- United Kingdom
- Prior art keywords
- prism
- lens
- virtual images
- kaleidoscopes
- condenser
- 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
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/02—Viewing or reading apparatus
- G02B27/08—Kaleidoscopes
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Projection Apparatus (AREA)
Abstract
218,763. Hilger, Ltd., A., and Twyman, F. April 17, 1923. Kaleidoscopes. - In projection kaleidoscopes wherein the light passes through a condenser c, a prism d the cross section of which is a regular polygon, and a projecting lens e, means are provided for illuminating the virtual images of the object to be projected. As shown, a prism b, similar in cross section to the prism d, is placed between the light source a and the condenser. The prism b forms virtual images f of the light source which are conjugate with the virtual images g of the centre of the projecting lens formed. by the prism d. Alternatively, other sources of light may be placed at the positions of the images f. A diaphragm may be placed in the plane of the image formed by the lens e, and the image limited thereby may be projected by a second lens on to the screen.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1044423A GB218763A (en) | 1923-04-17 | 1923-04-17 | Improvements in projection apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1044423A GB218763A (en) | 1923-04-17 | 1923-04-17 | Improvements in projection apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB218763A true GB218763A (en) | 1924-07-17 |
Family
ID=9967956
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1044423A Expired GB218763A (en) | 1923-04-17 | 1923-04-17 | Improvements in projection apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB218763A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113766218A (en) * | 2021-09-14 | 2021-12-07 | 北京集创北方科技股份有限公司 | Position detection method for optical lens, electronic device, and storage medium |
-
1923
- 1923-04-17 GB GB1044423A patent/GB218763A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113766218A (en) * | 2021-09-14 | 2021-12-07 | 北京集创北方科技股份有限公司 | Position detection method for optical lens, electronic device, and storage medium |
CN113766218B (en) * | 2021-09-14 | 2024-05-14 | 北京集创北方科技股份有限公司 | Position detection method of optical lens, electronic device and storage medium |
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