GB315501A - Improvements in or relating to diaphragms for acoustic instruments - Google Patents
Improvements in or relating to diaphragms for acoustic instrumentsInfo
- Publication number
- GB315501A GB315501A GB1236828A GB1236828A GB315501A GB 315501 A GB315501 A GB 315501A GB 1236828 A GB1236828 A GB 1236828A GB 1236828 A GB1236828 A GB 1236828A GB 315501 A GB315501 A GB 315501A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diaphragm
- coil
- threads
- moving
- washers
- 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
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
315,501. Paul, R. W. Jan. 24, 1929. Diaphragms; loud-speakers. - The diaphragm of a moving-coil loud-speaker or like acoustic instrument is in the form of a flat disc, of light wood such as balsa wood, mounted so as to be free to vibrate as a whole perpendicular to its plane and carrying the coil, being stiffened by ribs formed on or attached to the disc and dividing the surface into asymmetrical areas. Its mass may be further reduced by perforations covered by doped fabric pressed into domed form, and may be supported on threads or flexible washers. The diaphragm A, Figs. 1 and 2, is perforated at A<*> and covered with fabric C, while ribs D and an actuating coil B' are fastened to it. Threads E, E<1>, E<2>, and F, F<1>, F<2>, joined to the diaphragm and coil respectively support them centrally with respect to a magnetic system, as in Fig. 8, in which A<3> is the diaphragm B<6> the moving coil, and E<6> and F<3> are two of the supporting threads. Two of the latter may supply current to the moving coil. For centring the coil and diaphragm the threads E<6>, F<3>, &c. are secured to rotatable pins U, W, &c. held by clamps V on a bracket S. The annulus R surrounding the diaphragm A<3> may be surrounded by a baffle X. In another system of suspension, flexible washers H, H<1>, Fig. 4, shown in detail in Fig. 6, are anchored at the centre to a rod L inserted into the magnet pole M<1> and joined to the rings G and G<1> on the diaphragm A<2>. The washers H and H<1> are pierced by spiral apertures J, and mav be of celluloid, doped paper, &c. An extension L<2> of the rod L carries an insulating block I and fixing set screw O which supports terminal strips P<1> to which are soldered flexible connections Q from the moving coil. A feature of this construction is the facility with which the whole unit comprising diaphragm, coil, leads, and support may be withdrawn from the magnet system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1236828A GB315501A (en) | 1929-01-24 | 1929-01-24 | Improvements in or relating to diaphragms for acoustic instruments |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1236828A GB315501A (en) | 1929-01-24 | 1929-01-24 | Improvements in or relating to diaphragms for acoustic instruments |
Publications (1)
Publication Number | Publication Date |
---|---|
GB315501A true GB315501A (en) | 1929-07-18 |
Family
ID=10003243
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1236828A Expired GB315501A (en) | 1929-01-24 | 1929-01-24 | Improvements in or relating to diaphragms for acoustic instruments |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB315501A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3983337A (en) * | 1973-06-21 | 1976-09-28 | Babbco, Ltd. | Broad-band acoustic speaker |
-
1929
- 1929-01-24 GB GB1236828A patent/GB315501A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3983337A (en) * | 1973-06-21 | 1976-09-28 | Babbco, Ltd. | Broad-band acoustic speaker |
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