GB513561A - Improvements in or relating to telephone transmitters - Google Patents
Improvements in or relating to telephone transmittersInfo
- Publication number
- GB513561A GB513561A GB7816/39A GB781639A GB513561A GB 513561 A GB513561 A GB 513561A GB 7816/39 A GB7816/39 A GB 7816/39A GB 781639 A GB781639 A GB 781639A GB 513561 A GB513561 A GB 513561A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transmitter
- sealing compound
- casing
- cement
- grooves
- 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
- 238000007789 sealing Methods 0.000 abstract 4
- 150000001875 compounds Chemical class 0.000 abstract 3
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract 2
- 239000004568 cement Substances 0.000 abstract 2
- 239000000945 filler Substances 0.000 abstract 2
- IWZSHWBGHQBIML-ZGGLMWTQSA-N (3S,8S,10R,13S,14S,17S)-17-isoquinolin-7-yl-N,N,10,13-tetramethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-amine Chemical compound CN(C)[C@H]1CC[C@]2(C)C3CC[C@@]4(C)[C@@H](CC[C@@H]4c4ccc5ccncc5c4)[C@@H]3CC=C2C1 IWZSHWBGHQBIML-ZGGLMWTQSA-N 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229920001800 Shellac Polymers 0.000 abstract 1
- 125000000217 alkyl group Chemical group 0.000 abstract 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 abstract 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 239000008187 granular material Substances 0.000 abstract 1
- 239000011507 gypsum plaster Substances 0.000 abstract 1
- RCHKEJKUUXXBSM-UHFFFAOYSA-N n-benzyl-2-(3-formylindol-1-yl)acetamide Chemical compound C12=CC=CC=C2C(C=O)=CN1CC(=O)NCC1=CC=CC=C1 RCHKEJKUUXXBSM-UHFFFAOYSA-N 0.000 abstract 1
- 229920001568 phenolic resin Polymers 0.000 abstract 1
- 239000011347 resin Substances 0.000 abstract 1
- 229920005989 resin Polymers 0.000 abstract 1
- 239000003829 resin cement Substances 0.000 abstract 1
- 230000010255 response to auditory stimulus Effects 0.000 abstract 1
- ZLGIYFNHBLSMPS-ATJNOEHPSA-N shellac Chemical compound OCCCCCC(O)C(O)CCCCCCCC(O)=O.C1C23[C@H](C(O)=O)CCC2[C@](C)(CO)[C@@H]1C(C(O)=O)=C[C@@H]3O ZLGIYFNHBLSMPS-ATJNOEHPSA-N 0.000 abstract 1
- 229940113147 shellac Drugs 0.000 abstract 1
- 235000013874 shellac Nutrition 0.000 abstract 1
- 239000004208 shellac Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only for microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R21/00—Variable-resistance transducers
- H04R21/02—Microphones
- H04R21/021—Microphones with granular resistance material
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)
- Telephone Set Structure (AREA)
Abstract
513,561. Transmitters. STANDARD TELEPHONES & CABLES, Ltd., POCOCK, L. C., and LEMAN, H. S. April 6, 1938, No. 7816/39. Divided out of 513,529. [Class 40 (iv)] In a variable resistance transmitter or microphone in which granules of conducting material, for example, carbon, are agitated in response to sound waves for instance by means of an electrode, the fixed electrode structure of the transmitter is assembled in a recess or cavity in the transmitter casing and is permanently held in place therein solely by means of sealing compound. The transmitter, which is of the general form described in Specifications 435,130 and 494,293, comprises a moving electrode 8 and a fixed electrode structure, including the rear electrode 15 and its holder 16 and a centering ring 17, which is held in the cylindrical portion 11 of the casing 1 by sealing compound 19 which engages in grooves 18. The sealing compound may be formed by equal parts of a liquid phenol formaldehyde cement and finely-ground plaster of Paris, or by shellac cement with an inorganic filling agent, a phenol aldehyde resin cement, or a synthetic stopper incorporating an alkyl resin with inorganic filling agents. The sealing compound may be keyed to the casing by radial holes or axial grooves, and in the instrument shown in Fig. 6 the grooves 27 extend through the flange 13 at the inner end of the cylindrical portion 11 and are closed by discs 28.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB237518X | 1938-04-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB513561A true GB513561A (en) | 1939-10-16 |
Family
ID=10200725
Family Applications (5)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10565/38A Expired GB513529A (en) | 1938-04-06 | 1938-04-06 | Improvements in or relating to telephone transmitters |
| GB7816/39A Expired GB513561A (en) | 1938-04-06 | 1938-04-06 | Improvements in or relating to telephone transmitters |
| GB7815/39A Expired GB526212A (en) | 1938-04-06 | 1939-03-10 | Improvements in or relating to telephone transmitters |
| GB21035/45A Expired GB594116A (en) | 1938-04-06 | 1944-08-15 | Improvements in or relating to microphones |
| GB1277/45A Expired GB593082A (en) | 1938-04-06 | 1945-01-16 | Improvements in and relating to sliding bolts for doors and otherwise |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB10565/38A Expired GB513529A (en) | 1938-04-06 | 1938-04-06 | Improvements in or relating to telephone transmitters |
Family Applications After (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7815/39A Expired GB526212A (en) | 1938-04-06 | 1939-03-10 | Improvements in or relating to telephone transmitters |
| GB21035/45A Expired GB594116A (en) | 1938-04-06 | 1944-08-15 | Improvements in or relating to microphones |
| GB1277/45A Expired GB593082A (en) | 1938-04-06 | 1945-01-16 | Improvements in and relating to sliding bolts for doors and otherwise |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE433695A (en) |
| CH (1) | CH237518A (en) |
| FR (1) | FR852567A (en) |
| GB (5) | GB513529A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1025452B (en) * | 1952-09-18 | 1958-03-06 | Standard Elektrik Ag | Electro-acoustic converter with Helmholz resonator |
| DE1012641B (en) * | 1954-04-27 | 1957-07-25 | Akg Akustische Kino Geraete | Arrangement at sound transducers to smooth the frequency characteristics |
| US2758861A (en) * | 1954-11-12 | 1956-08-14 | Arthur N Molloy | Bolt lock |
| DE1147631B (en) * | 1960-08-16 | 1963-04-25 | Sennheiser Electronic | Electroacoustic converter |
| US4205206A (en) * | 1975-10-31 | 1980-05-27 | Iwatsu Electric Co. Ltd. | Carbon granule microphone with molded resin-conductive carbon electrode |
| GB2203480A (en) * | 1987-04-15 | 1988-10-19 | Leslie Thomas Isaac | Sliding bolt assembly |
-
0
- BE BE433695D patent/BE433695A/xx unknown
- FR FR852567D patent/FR852567A/fr not_active Expired
-
1938
- 1938-04-06 GB GB10565/38A patent/GB513529A/en not_active Expired
- 1938-04-06 GB GB7816/39A patent/GB513561A/en not_active Expired
-
1939
- 1939-03-10 GB GB7815/39A patent/GB526212A/en not_active Expired
- 1939-04-06 CH CH237518D patent/CH237518A/en unknown
-
1944
- 1944-08-15 GB GB21035/45A patent/GB594116A/en not_active Expired
-
1945
- 1945-01-16 GB GB1277/45A patent/GB593082A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BE433695A (en) | |
| GB526212A (en) | 1940-09-12 |
| GB593082A (en) | 1947-10-08 |
| FR852567A (en) | 1940-03-01 |
| GB594116A (en) | 1947-11-03 |
| CH237518A (en) | 1945-04-30 |
| GB513529A (en) | 1939-10-16 |
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