NL34521C - - Google Patents
Info
- Publication number
- NL34521C NL34521C NL34521DA NL34521C NL 34521 C NL34521 C NL 34521C NL 34521D A NL34521D A NL 34521DA NL 34521 C NL34521 C NL 34521C
- Authority
- NL
- Netherlands
- Prior art keywords
- light
- source
- zeiss
- electromagnet
- prism
- Prior art date
Links
- 230000005540 biological transmission Effects 0.000 abstract 2
- 230000003287 optical effect Effects 0.000 abstract 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 229910052711 selenium Inorganic materials 0.000 abstract 1
- 239000011669 selenium Substances 0.000 abstract 1
- 230000011664 signaling Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mechanical Light Control Or Optical Switches (AREA)
- Optical Communication System (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
409,073. Photophones. ZEISS, C., [Firm of], Carl-Zeiss-Strasse, Jena, Germany. Dec. 17, 1932, No. 35814. Convention date, Dec. 23, 1931. [Class 40 (v).] Some parts of an optical signalling apparatus are used for both transmission and reception, and the necessary changes in the other electric and optical parts are made by a single switch k, Fig. 1. For transmission an electromagnet f<1>, traversed by the signals, moves a prism d to and from a reflecting-surface c<1> and thus modulates the reflection of light incident from a source g. For reception a constant current is passed through the electromagnet of such strength the prism is pressed tightly against the reflecting surface so that the received incident light passes uninterruptedly to the selenium cell h. According to a modification, Fig. 2, the light from a source r is modulated by a movable diaphragm p. The side opposite the source has an inclined surface v which, in the position where the light from the source r is completely cut off, deflects the received light to a light-sensitive cell u.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE409073X | 1931-12-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NL34521C true NL34521C (en) |
Family
ID=6422367
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NL34521D NL34521C (en) | 1931-12-23 |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US1973089A (en) |
| FR (1) | FR747649A (en) |
| GB (1) | GB409073A (en) |
| NL (1) | NL34521C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2466000A (en) * | 1945-06-12 | 1949-04-05 | Chester L Brown | Photophone |
| US3290503A (en) * | 1963-05-06 | 1966-12-06 | Raytheon Co | Light communication system |
-
0
- NL NL34521D patent/NL34521C/xx active
-
1932
- 1932-12-16 US US647625A patent/US1973089A/en not_active Expired - Lifetime
- 1932-12-16 FR FR747649D patent/FR747649A/en not_active Expired
- 1932-12-17 GB GB35814/32A patent/GB409073A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US1973089A (en) | 1934-09-11 |
| FR747649A (en) | 1933-06-20 |
| GB409073A (en) | 1934-04-26 |
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