GB317134A - Improvements in or relating to sound reproducing or transmitting instruments - Google Patents
Improvements in or relating to sound reproducing or transmitting instrumentsInfo
- Publication number
- GB317134A GB317134A GB1193528A GB1193528A GB317134A GB 317134 A GB317134 A GB 317134A GB 1193528 A GB1193528 A GB 1193528A GB 1193528 A GB1193528 A GB 1193528A GB 317134 A GB317134 A GB 317134A
- Authority
- GB
- United Kingdom
- Prior art keywords
- coils
- diaphragm
- aluminium
- ring
- parchment
- 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
- 239000004411 aluminium Substances 0.000 abstract 4
- 229910052782 aluminium Inorganic materials 0.000 abstract 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract 2
- 229910052802 copper Inorganic materials 0.000 abstract 2
- 239000010949 copper Substances 0.000 abstract 2
- 239000010985 leather Substances 0.000 abstract 2
- 239000000123 paper Substances 0.000 abstract 2
- 229920002160 Celluloid Polymers 0.000 abstract 1
- 229920001800 Shellac Polymers 0.000 abstract 1
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 238000007789 sealing Methods 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
- 238000004804 winding Methods 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
- 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
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/12—Non-planar diaphragms or cones
- H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
317,134. Westhead, W. R. Jan. 7, 1929. No Patent granted (Sealing fee not paid). Magnetic instruments; diaphragms.-A sound reproducing or transmitting instrument, such as a hornless loud-speaker, comprises a large diameter conical diaphragm connected at different parts to a number of coils arranged in a magneticfield. The coils are preferably arranged concentrically, each being located in a separate magnetic field. In the construction shown, the diaphragm A of re-entrant cone formation is actuated by coils B, C, D located in the annular fields of electromagnets b<1>, c<1>, d<1> respectively. Screens G of copper or aluminium are preferably provided between adjacent magnets and may be earthed. The coils are preferably made of aluminium wire and wound on formers made of shellac treated " detail " or writing paper, copper, or aluminium, the coils C, D being mounted on frusto-conical members c, d secured to the portion a<1> of the diaphragm. The diaphragm, which may be made of parchment, thin sheet aluminium, Bristol board, celluloid, stiff paper or the material known under the registered Trade Mark " Paxolin," is supported in an opening in a baffle board E by a ring a<3> of oiled silk, leather, treated skin &c. clamped between metal rings F, one of which is carried on arms f attached to the magnet system. The ring a<3> may be tensioned slightly to avoid the use of a centring device for the coils. A slack ring is, however, preferably employed, and the coils centred either by narrow leather strips H arranged at the front and back of the diaphragm as shown in Fig. 1, or by means of the device shown in Fig. 2, which is made of thin cardboard or drum parchment and has the outer ring K clamped between the rings F and its centre portion k attached to the centre of the diaphragm. The coils may be connected in series or parallel to the amplifier or to the secondary of an output transformer employed therewith. Preferably, the individual coils are connected to independent secondaries or variable resistances are arranged in series with the field windings of the electromagnets for altering the strength of the magnetic fields. Specification 311,486 is disclaimed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1193528A GB317134A (en) | 1929-01-07 | 1929-01-07 | Improvements in or relating to sound reproducing or transmitting instruments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1193528A GB317134A (en) | 1929-01-07 | 1929-01-07 | Improvements in or relating to sound reproducing or transmitting instruments |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB317134A true GB317134A (en) | 1929-08-15 |
Family
ID=9995334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1193528A Expired GB317134A (en) | 1929-01-07 | 1929-01-07 | Improvements in or relating to sound reproducing or transmitting instruments |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB317134A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551556A (en) * | 1945-09-12 | 1951-05-01 | E D Mccurdy | Acoustic diaphragm with plural voice coil supports |
| US2789161A (en) * | 1951-04-05 | 1957-04-16 | Joseph B Brennan | Loud-speakers |
-
1929
- 1929-01-07 GB GB1193528A patent/GB317134A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2551556A (en) * | 1945-09-12 | 1951-05-01 | E D Mccurdy | Acoustic diaphragm with plural voice coil supports |
| US2789161A (en) * | 1951-04-05 | 1957-04-16 | Joseph B Brennan | Loud-speakers |
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