GB1272207A - Overhead projector - Google Patents
Overhead projectorInfo
- Publication number
- GB1272207A GB1272207A GB2553670A GB2553670A GB1272207A GB 1272207 A GB1272207 A GB 1272207A GB 2553670 A GB2553670 A GB 2553670A GB 2553670 A GB2553670 A GB 2553670A GB 1272207 A GB1272207 A GB 1272207A
- Authority
- GB
- United Kingdom
- Prior art keywords
- housing
- overhead projector
- lens
- writing
- ritzerfeld
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/132—Overhead projectors, i.e. capable of projecting hand-writing or drawing during action
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
- Drawing Aids And Blackboards (AREA)
Abstract
1,272,207. Overhead projectors. G. RITZERFELD. May 27, 1970 [March 2, 1970], No.25536/70. Heading G2A. A writing projector comprises a light source 11 within a housing 1 upon which are mounted a detachable transparent writing plate over a Fresnel lens 4 carried in a stirrup 5 pivoted to housing 1 by pins 7 whereby the lens 4 may be raised for cleaning.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19707008118 DE7008118U (en) | 1970-03-02 | 1970-03-02 | WRITING PROJECTOR |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1272207A true GB1272207A (en) | 1972-04-26 |
Family
ID=6609946
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2553670A Expired GB1272207A (en) | 1970-03-02 | 1970-05-27 | Overhead projector |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE7008118U (en) |
GB (1) | GB1272207A (en) |
-
1970
- 1970-03-02 DE DE19707008118 patent/DE7008118U/en not_active Expired
- 1970-05-27 GB GB2553670A patent/GB1272207A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE7008118U (en) | 1970-07-16 |
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