EP0081780A1 - Transducteur électrodynamique - Google Patents
Transducteur électrodynamique Download PDFInfo
- Publication number
- EP0081780A1 EP0081780A1 EP82111252A EP82111252A EP0081780A1 EP 0081780 A1 EP0081780 A1 EP 0081780A1 EP 82111252 A EP82111252 A EP 82111252A EP 82111252 A EP82111252 A EP 82111252A EP 0081780 A1 EP0081780 A1 EP 0081780A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- opening
- membrane
- pin
- transducer according
- converter
- 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.)
- Granted
Links
- 230000005520 electrodynamics Effects 0.000 title claims abstract description 4
- 239000012528 membrane Substances 0.000 claims abstract description 20
- 230000035945 sensitivity Effects 0.000 claims abstract description 6
- 210000004379 membrane Anatomy 0.000 description 17
- 230000001419 dependent effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
Images
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
- H04R9/10—Telephone receivers
-
- 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
Definitions
- the invention relates to an electrodynamic converter with a membrane voice coil arrangement held by a fastening ring and a permanent magnet system arranged in a housing.
- a transducer is described in European Patent Application No. 81 302 213.4 (Publication No. 0 040 948).
- the object underlying the invention is to provide a transducer in which the undesirable low frequencies are damped by design measures and thus the sensitivity of the transducer to these frequencies is reduced.
- the frequency dependence of the acoustic resistance shifts towards higher frequencies, while the acoustic reactive resistance is increased, as a result of which the total impedance of the acoustic shunt by the voice coil is greater at those frequencies at which the acoustic resistance is frequency-dependent.
- the distortions resulting from the sensitivity correcting shunt are reduced to a minimum.
- This transducer consists of the membrane voice coil arrangement 13, 15 arranged on the fastening ring 10 and the permanent magnet system 5, 4, 3, which is held together by the guide rod 2 forming part of the housing 1.
- the voice coil 15 is arranged concentrically in the air gap 6 formed by the pole shoes 3 and 4.
- the converter also has a retaining ring 20.
- FIGS. 28 and 2C show schematically and greatly enlarged an exemplary embodiment for the elongated opening 21, which is arranged concentrically in the membrane 13.
- several elongated openings 22, 23 are provided. It has been found that these embodiments represent a far better problem solution for an acoustic shunt than a simple cylindrical hole. However, such elongated openings are not so easy to manufacture.
- FIG. 3 also greatly enlarged, another embodiment of an acoustic shunt is shown, in which the opening 24 be a piece of pipe 25 be stands, which is fixed in a hole in the membrane.
- the pipe section 25 should fit well into the hole and there through a glue or dgL. be attached.
- the advantage of this embodiment is that the air flow through this opening is influenced not only by the diameter of the pipe section 25, but also by the inner surface of the pipe section, which dampens the air flow and thus increases the acoustic reactive resistance causes. The effect achieved depends on both the inside diameter of the tube and its length.
- FIGS. 4 and 5 illustrate further acoustic shunts according to the invention, which differ in two ways from a shunt which consists of an ordinary hole.
- the representations in Figures 4 and 5 are not to scale, and the bypass is shown greatly enlarged.
- the acoustic shunt consists of an elongated circular opening 26 which arises between the outer surface of a pin 27, 28 and the inner surface of a hole 29 into which the pin is immersed.
- the ring width A (Fig. 6), which limits the path of the air flow through the membrane, is smaller than the diameter of a hole which would be necessary to achieve the same acoustic resistance. As a result, the frequency at which the acoustic resistance becomes frequency-dependent is shifted towards higher frequencies.
- the fixed pins 27, 28 projecting into the hole 29 ensure that one of the edges delimiting the air flow has a large surface area towards the air flow. The consequence of this is that the acoustic reactive resistance is large compared to the acoustic resistance at those frequencies at which the resistance is frequency-dependent.
- the annular opening 26 should preferably be arranged concentrically in the membrane.
- the construction of the converter, as illustrated in FIG. 1, facilitates the implementation of the pin-hole arrangement, as shown in FIGS. 4 and 5.
- the pin 27 is a component of the guide rod 2.
- the hole 29 in the membrane 13 can be punched after the membrane has been attached to the support ring 10 and with the help of the same reference surfaces which are used for the Adjustment of the voice coil can be used, adjusted. Further details in connection with the manufacture and assembly of the voice coil are described in European Patent Application No. 81 302 213.4.
- FIG. 5 Another embodiment of the pin-hole arrangement is illustrated in FIG. 5. Instead of connecting the pin to the concentrically arranged guide rod 2, the same effect can be achieved if the pin 28 (FIG. 5) is attached to the retaining ring 20. However, it could prove more difficult to adjust such a pin 28.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DK547381A DK148550C (da) | 1981-12-10 | 1981-12-10 | Elektrodynamisk transducer med bevaegelig spole |
| DK5473/81 | 1981-12-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0081780A1 true EP0081780A1 (fr) | 1983-06-22 |
| EP0081780B1 EP0081780B1 (fr) | 1986-10-01 |
Family
ID=8142738
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19820111252 Expired EP0081780B1 (fr) | 1981-12-10 | 1982-12-04 | Transducteur électrodynamique |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0081780B1 (fr) |
| AU (1) | AU556443B2 (fr) |
| DE (1) | DE3273600D1 (fr) |
| DK (1) | DK148550C (fr) |
| NZ (1) | NZ202625A (fr) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3530869A1 (de) * | 1985-08-29 | 1987-03-12 | Sennheiser Electronic | Membran fuer einen elektroakustischen wiedergabewandler |
| US5155773A (en) * | 1989-10-09 | 1992-10-13 | Kirk Acoustics A/S | Electrodynamic transducer including inset |
| WO2012114159A1 (fr) * | 2011-02-25 | 2012-08-30 | Nokia Corporation | Appareil transducteur |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR34820E (fr) * | 1925-01-09 | 1927-10-21 | ||
| DE864269C (de) * | 1948-10-31 | 1953-01-22 | Charlotte Thomson | Elektrodynamische Schwingspule mit Selbstkuehlung |
| GB819146A (en) * | 1956-11-26 | 1959-08-26 | Standard Telephones Cables Ltd | Improvements in or relating to acoustic impedance devices |
| US2966558A (en) * | 1956-10-11 | 1960-12-27 | Hugh S Knowles | Transducer and vibratory diaphragm |
| DE1230858B (de) * | 1960-06-22 | 1966-12-22 | Siemens Ag | Membran fuer einen elektroakustischen Wandler |
| DE1762676A1 (de) * | 1968-08-02 | 1970-07-02 | Peerles Mb Gmbh Feinmechanik U | Membran fuer Mikrofonsystem mit Kugelcharakteristik oder Lautsprechersystem |
| DE2322475A1 (de) * | 1972-02-09 | 1974-11-21 | Lehner Fernsprech Signal | Elektroakustischer wandler, insbesondere fuer sprech- und hoerkapseln von fernsprechapparaten |
-
1981
- 1981-12-10 DK DK547381A patent/DK148550C/da not_active IP Right Cessation
-
1982
- 1982-11-26 NZ NZ20262582A patent/NZ202625A/en unknown
- 1982-12-04 EP EP19820111252 patent/EP0081780B1/fr not_active Expired
- 1982-12-04 DE DE8282111252T patent/DE3273600D1/de not_active Expired
- 1982-12-06 AU AU91132/82A patent/AU556443B2/en not_active Ceased
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR34820E (fr) * | 1925-01-09 | 1927-10-21 | ||
| DE864269C (de) * | 1948-10-31 | 1953-01-22 | Charlotte Thomson | Elektrodynamische Schwingspule mit Selbstkuehlung |
| US2966558A (en) * | 1956-10-11 | 1960-12-27 | Hugh S Knowles | Transducer and vibratory diaphragm |
| GB819146A (en) * | 1956-11-26 | 1959-08-26 | Standard Telephones Cables Ltd | Improvements in or relating to acoustic impedance devices |
| DE1230858B (de) * | 1960-06-22 | 1966-12-22 | Siemens Ag | Membran fuer einen elektroakustischen Wandler |
| DE1762676A1 (de) * | 1968-08-02 | 1970-07-02 | Peerles Mb Gmbh Feinmechanik U | Membran fuer Mikrofonsystem mit Kugelcharakteristik oder Lautsprechersystem |
| DE2322475A1 (de) * | 1972-02-09 | 1974-11-21 | Lehner Fernsprech Signal | Elektroakustischer wandler, insbesondere fuer sprech- und hoerkapseln von fernsprechapparaten |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3530869A1 (de) * | 1985-08-29 | 1987-03-12 | Sennheiser Electronic | Membran fuer einen elektroakustischen wiedergabewandler |
| US5155773A (en) * | 1989-10-09 | 1992-10-13 | Kirk Acoustics A/S | Electrodynamic transducer including inset |
| WO2012114159A1 (fr) * | 2011-02-25 | 2012-08-30 | Nokia Corporation | Appareil transducteur |
| US9271067B2 (en) | 2011-02-25 | 2016-02-23 | Nokia Technologies Oy | Transducer apparatus having a mechanical acoustic filter with movable blocking member |
Also Published As
| Publication number | Publication date |
|---|---|
| DK148550B (da) | 1985-07-29 |
| AU9113282A (en) | 1983-06-16 |
| DK547381A (da) | 1983-06-11 |
| NZ202625A (en) | 1985-08-16 |
| DK148550C (da) | 1986-04-21 |
| EP0081780B1 (fr) | 1986-10-01 |
| DE3273600D1 (en) | 1986-11-06 |
| AU556443B2 (en) | 1986-11-06 |
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