GB956362A - Electro-acoustic transducer assemblies and methods of manufacturing resonance-damping cover walls therefor - Google Patents
Electro-acoustic transducer assemblies and methods of manufacturing resonance-damping cover walls thereforInfo
- Publication number
- GB956362A GB956362A GB2326560A GB2326560A GB956362A GB 956362 A GB956362 A GB 956362A GB 2326560 A GB2326560 A GB 2326560A GB 2326560 A GB2326560 A GB 2326560A GB 956362 A GB956362 A GB 956362A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wall
- diaphragm
- slit
- slots
- slot
- 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
- 238000013016 damping Methods 0.000 title abstract 2
- 238000000429 assembly Methods 0.000 title 1
- 230000000712 assembly Effects 0.000 title 1
- 238000004519 manufacturing process Methods 0.000 title 1
- 238000000034 method Methods 0.000 title 1
- 239000000463 material Substances 0.000 abstract 4
- 238000005452 bending Methods 0.000 abstract 2
- 239000004568 cement Substances 0.000 abstract 1
- 239000002184 metal Substances 0.000 abstract 1
- 230000000717 retained effect Effects 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
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
956,362. Telephone instruments. SONOTONE CORPORATION. July 4, 1960 [July 6, 1959], No. 23265/60. Heading H4J. An electro-acoustic transducer assembly ineludes a housing enclosing a transducer 21 (Fig. 1) and a vibratory diaphragm 64, the housing having a cover wall 70 (Figs. 4, 5) that defines with the diaphragm 64 an enclosure communicating with the exterior of the assembly through a series of apertures in the cover wall, each aperture comprising a slot 71 defined by the opposite edges of a slit cut in the cover wall, the opposed edges of the cut slit being displaced relative to each other by an amount exceeding the thickness of the wall material, and the width of the slot 71 so formed being less than the thickness of the wall material such that it provides a significant degree of damping to acoustic resonances of the diaphragm 64. The slots 71 are made by cutting a series of slits in a sheet-metal blank, bending the material defining at least one edge of each slit out of the original plane of the blank, and bending the material back towards its original position. Each edge of each slit may be first bent in opposite directions out of the original plane of the blank and subsequently bent back inwardly to define a slot 79 (Figs. 11, 12, not shown). The slots are of width 0.0005 to 0.003 inch. The device is a microphone and transducer 21 is a piezo-electric element coupled to diaphragm 64 by a stirrup 66. The wall 70 may have one or more stiffening ribs 78. The circular rim 74 of wall 70 is secured by cement to a housing 60 and to the periphery of the diaphragm 64. Alternatively, or in addition, rim 74 is retained in position by a flange 68 of an elastomeric casing 69. The dimensions of the slots may be checked by holding the wall 70 in a jig and feeding gas under pressure through the wall 70 while measuring the pressure difference on a gauge connected across the two sides of the wall 70 (Fig. 10, not shown).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US82508359A | 1959-07-06 | 1959-07-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB956362A true GB956362A (en) | 1964-04-29 |
Family
ID=25243070
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2326560A Expired GB956362A (en) | 1959-07-06 | 1960-07-04 | Electro-acoustic transducer assemblies and methods of manufacturing resonance-damping cover walls therefor |
Country Status (2)
Country | Link |
---|---|
GB (1) | GB956362A (en) |
NL (1) | NL111059C (en) |
-
0
- NL NL111059D patent/NL111059C/xx active
-
1960
- 1960-07-04 GB GB2326560A patent/GB956362A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL111059C (en) |
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