GB442228A - Improvements in photophones - Google Patents
Improvements in photophonesInfo
- Publication number
- GB442228A GB442228A GB22780/34A GB2278034A GB442228A GB 442228 A GB442228 A GB 442228A GB 22780/34 A GB22780/34 A GB 22780/34A GB 2278034 A GB2278034 A GB 2278034A GB 442228 A GB442228 A GB 442228A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plate
- armature
- prism
- pivoted
- light
- 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
-
- 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
- H04B10/50—Transmitters
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)
- Treatments Of Macromolecular Shaped Articles (AREA)
- Optical Elements Other Than Lenses (AREA)
- Optical Communication System (AREA)
Abstract
442,228. Photophones. ZEISS, C., [Firm of], Carl-Zeiss-Strasse. Jena, Germany. Aug. 4, 1934, No. 22780. Convention date, Aug. 17, 1933. [Class 40 (v)] Relates to a photophone in which the pencil of light for the transmission of sound is modulated by a body that moves relatively to a totally reflecting surface and is rigidly connected to a part influenced by electromagnetic or electrostatic means. According. to the invention, the body and the electrically influenced part are mounted on the body containing the totally reflecting surface. As shown in Fig. 1, light from a source b passes through a condenser a to a rectangular prism c by which it is reflected through an objective d. A glass plate e lies against the surface c<1> of the prism and is mounted in an armature f, Figs. 2 and 3, which is pivoted at f<1>, f<2> on the surface c<1>. A tongue cut out from the armature is pressed against the surface cl by an adjusting screw h<1> carried by a bar h fixed to the legs of a horseshoe magnet l which holds the prism c and is supported by the housing m. An elastic arm i also presses against the armature near its axis of oscillation, the arm being pivoted on a bolt i<1> on the magnet l and actuated by a two-armed lever j pivoted at j<1> on the housing m so as to adjust the distance of the plate e from the surface c<1> or the pressure of the plate against this surface. The magnet l carries cores k located on the side of the armature facing the prism, speech currents passing through the windings surrounding these cores causing the armature f and plate e to oscillate thereby varying the pressure with which the plate e lies against the surface c<1> so as to control the amount of light which is reflected through the objective d. Flutes may be provided either on the surface c<1> or on the surface of the plate e co-operating therewith.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE442228X | 1933-08-17 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB442228A true GB442228A (en) | 1936-02-04 |
Family
ID=6521506
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB22780/34A Expired GB442228A (en) | 1933-08-17 | 1934-08-04 | Improvements in photophones |
Country Status (3)
Country | Link |
---|---|
US (1) | US2010313A (en) |
DE (1) | DE604401C (en) |
GB (1) | GB442228A (en) |
-
0
- DE DENDAT604401D patent/DE604401C/de active Active
-
1934
- 1934-08-04 GB GB22780/34A patent/GB442228A/en not_active Expired
- 1934-08-11 US US739382A patent/US2010313A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US2010313A (en) | 1935-08-06 |
DE604401C (en) |
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