GB1203128A - A device for the automatic focusing of slide projectors - Google Patents
A device for the automatic focusing of slide projectorsInfo
- Publication number
- GB1203128A GB1203128A GB5276268A GB5276268A GB1203128A GB 1203128 A GB1203128 A GB 1203128A GB 5276268 A GB5276268 A GB 5276268A GB 5276268 A GB5276268 A GB 5276268A GB 1203128 A GB1203128 A GB 1203128A
- Authority
- GB
- United Kingdom
- Prior art keywords
- slide
- focusing
- focused
- automatic focusing
- nov
- 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
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Projection Apparatus (AREA)
Abstract
1,203,128. Slide projectors; focusing. ERNST LEITZ G.m.b.H. Nov. 7, 1968 [Nov.18, 1967], No.52762/68. Heading G2A. [Also in Division G1] An automatic focusing device for slide projectors comprises an optical system which directs a beam 4 of light for reflection by a slide 7 on to a double photo-electric cell 16 in a differential circuit for controlling the focusing of the slide, a double field lens 13 splitting the beam into two separate beams. Reversible motor 19 in the differential circuit drives rack and pinion focusing devices 20, 21, until the reflected beam falls on the dividing line of the lenses 13a, 13b, the slide then being focused. Surfaces 15a, 15b, completely certain the split beams 4a which may be focused or non-focused.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEL0046079 | 1967-11-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1203128A true GB1203128A (en) | 1970-08-26 |
Family
ID=7271440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5276268A Expired GB1203128A (en) | 1967-11-18 | 1968-11-07 | A device for the automatic focusing of slide projectors |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1203128A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2445512A1 (en) * | 1978-12-27 | 1980-07-25 | Thomson Csf | Position detecting system for image forming appts. - includes two part photodiode providing two signals with difference proportional to position error |
JPS5752008A (en) * | 1981-06-17 | 1982-03-27 | Canon Inc | Distance detector |
EP0083413A1 (en) * | 1981-12-31 | 1983-07-13 | International Business Machines Corporation | Autofocus arrangement for electron-beam lithographic systems |
US5078487A (en) * | 1984-11-19 | 1992-01-07 | Canon Kabushiki Kaisha | Projecting apparatus |
-
1968
- 1968-11-07 GB GB5276268A patent/GB1203128A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2445512A1 (en) * | 1978-12-27 | 1980-07-25 | Thomson Csf | Position detecting system for image forming appts. - includes two part photodiode providing two signals with difference proportional to position error |
JPS5752008A (en) * | 1981-06-17 | 1982-03-27 | Canon Inc | Distance detector |
EP0083413A1 (en) * | 1981-12-31 | 1983-07-13 | International Business Machines Corporation | Autofocus arrangement for electron-beam lithographic systems |
US5078487A (en) * | 1984-11-19 | 1992-01-07 | Canon Kabushiki Kaisha | Projecting apparatus |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |