EP0471990B1 - Double-coil loudspeaker - Google Patents
Double-coil loudspeaker Download PDFInfo
- Publication number
- EP0471990B1 EP0471990B1 EP91112202A EP91112202A EP0471990B1 EP 0471990 B1 EP0471990 B1 EP 0471990B1 EP 91112202 A EP91112202 A EP 91112202A EP 91112202 A EP91112202 A EP 91112202A EP 0471990 B1 EP0471990 B1 EP 0471990B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- winding
- winding assembly
- pole plate
- voice coil
- permanent magnet
- 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 - Lifetime
Links
- 238000004804 winding Methods 0.000 claims description 65
- 230000000712 assembly Effects 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000005236 sound signal Effects 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 7
- 238000010276 construction Methods 0.000 claims 3
- 241000239290 Araneae Species 0.000 claims 1
- 239000002356 single layer Substances 0.000 claims 1
- 239000012528 membrane Substances 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 7
- 238000005755 formation reaction Methods 0.000 description 7
- 239000004020 conductor Substances 0.000 description 6
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001771 impaired effect Effects 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
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/041—Centering
-
- 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
Definitions
- the invention relates to a double coil loudspeaker, in which each of the two voice coils are acted upon by sound signals from different signal sources and is based on US-A-4'897'877.
- loudspeakers which differ from conventionally known dynamic cone loudspeakers, for example illustrated in Funkschau 1983, No. 7, page 99, FIG. 1, only by a modified voice coil design and explained in more detail below, are used above all where there is space constraint To transmit sound signals from two different signal sources using only one membrane.
- this double-coil loudspeaker has two coil-shaped winding assemblies on the voice coil support, with one turn of the other winding assembly being arranged next to each turn of the first winding assembly. If the winding formations are laid around the voice coil former in multiple layers, this does not change the arrangement of the turns of the two winding formations described above in relation to one another in the respective positions. Only the individual windings in a lower layer are covered by windings in the layer above, which each belong to a different winding structure. The windings of all winding formations usually have the same wire cross-section.
- the effective conductor length of the two winding assemblies is matched to the thickness of the pole plate adjacent to the winding assemblies or the thickness of this pole plate is adapted to the effective conductor lengths for the frequency spectra to be transmitted.
- the effective conductor length is understood to mean the longitudinal extension of the winding formations on the voice coil former parallel to the central axis of the loudspeaker. According to this explanation, it is also understandable in itself why the sound reproduction quality is reduced compared to single-coil loudspeakers when the two winding groups are subjected to sound signals of different frequency spectra.
- the well-known winding design with adjacent Windings of different winding connections have the effect that only one winding group can be optimally designed with regard to the effective conductor length for the frequency spectrum to be transmitted. But the winding bandage, whose effective conductor length is optimized, is still no guarantee of good sound reproduction behavior. This is because, due to the known arrangement of the winding associations on the voice coil former, the non-optimized winding association counteracts the optimized winding association with an increased ballast weight compared to a single-coil loudspeaker.
- the outer winding bandage is only acted upon by a speech signal source, the sound reproduction of the second sound signal source (such as a stereo system) is not impaired by the winding effort for speech reproduction.
- the double coil loudspeaker according to the invention with its first winding assembly as loudspeaker for the audio system of the motor vehicle and with its second winding assembly as loudspeaker for the speech reproduction of the telephone with hands-free operation can be used.
- This arrangement also eliminates the need for a switchover unit, which is required when the cone loudspeakers of the audio system simultaneously take over the sound reproduction of the telephone, as is conventional.
- the conventionally designed double-coil loudspeaker illustrated in FIG. 1 has a conical basket 10 in which the cone-shaped membrane 11 is inserted.
- the membrane 11 and the basket 10 are connected to one another at their ends, each of which has the larger diameter.
- the end of the membrane 11, which has the smaller diameter, is covered by a hemispherical dust cap 12 pointing towards the other end of the membrane 11.
- annular permanent magnet 13 is attached centrally to the central axis of the loudspeaker, with another between the end of the basket 10 and the permanent magnet 13 is also annular, but has a smaller inner diameter than the permanent magnet 13 pole plate 14 is interposed.
- the other annular surface of the permanent magnet 13 facing away from the basket 10 is covered with a disk-shaped second pole plate 15.
- a tubular voice coil former 17 is attached to the end of the membrane 11, which has the smaller diameter.
- a concertina-shaped centering membrane 18 is arranged between the inner surface of the basket 10 and the end of the voice coil bobbin 17, which faces the membrane 11. This ensures during operation of the loudspeaker that the voice coil bobbin 17 is always centered on the central axis of the loudspeaker.
- each turn 22 of a first winding assembly 20 is a turn 22 in the vertical extent of the other winding association 21.
- This arrangement of the windings 22 with respect to one another also applies in a horizontal extension if, as shown in FIG. 1, the winding assemblies 20, 21 are laid in multiple layers around the voice coil former 17.
- the cross-section of the winding wire is the same for both winding groups 20, 21.
- the longitudinal extent of the wound formations 20, 21 on the voice coil bobbin 17 is selected so that the idle state of the loudspeaker means that the wound formations 20, 21 are approximately in the middle of the first pole plate 14 located next to it on the inside.
- the ends 23 of the winding wire of each winding assembly 20, 21 are guided to the connecting terminals 24, 25 arranged on the basket 10.
- FIG. 2 A double coil loudspeaker designed according to the invention is illustrated in FIG. 2. This differs from the double coil loudspeaker described in FIG. 1 by a different arrangement of the winding formations 20, 21 on the voice coil former 17.
- a first winding assembly 20 is placed in multiple layers around the outer jacket 19 of the voice coil bobbin 17.
- the second winding bandage 21 is also placed in multiple layers on this winding bandage 20.
- this winding assembly 21 is distinguished by a reduced wire cross section and a reduced winding width in the longitudinal direction of the voice coil bobbin 17.
- the longitudinal dimensions of both winding assemblies 20, 21 also protrude here, the first pole plate 14 arranged next to them at the same distance.
- each winding assembly 20, 21 can be adapted to the frequency spectrum to be transmitted in each case. If the second winding bandage 21 is designed for the voice reproduction of a telephone, this winding bandage 21, because of its light weight, has no influence on the reproduction quality of the other winding bandage 20 designed for a different frequency spectrum.
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)
- Circuit For Audible Band Transducer (AREA)
Description
Die Erfindung betrifft einen Doppelspulenlautsprecher, bei dem jede der beiden Schwingspulen mit Tonsignalen aus verschiedenen Signalquellen beaufschlagt werden und geht aus von der US-A-4′897′877.The invention relates to a double coil loudspeaker, in which each of the two voice coils are acted upon by sound signals from different signal sources and is based on US-A-4'897'877.
Derartige Doppelspulenlautsprecher sind seit einiger Zeit im Stand der Technik bekannt.Such double-coil loudspeakers have been known in the prior art for some time.
Diese Lautsprecher, welche sich gegenüber herkömmlich bekannten, zum Beispiel in der Funkschau 1983, Heft 7, Seite 99, Figur 1 veranschaulichten dynamischen Konuslautsprechern nur durch eine geänderte und unten näher erläuterte Schwingspulenausbildung unterscheiden, finden vor allem dort Anwendung, wo es aufgrund beengter Platzverhältnisse gilt, Tonsignale aus zwei verschiedenen Signalquellen mittels nur einer Membran zu übertragen.These loudspeakers, which differ from conventionally known dynamic cone loudspeakers, for example illustrated in Funkschau 1983, No. 7, page 99, FIG. 1, only by a modified voice coil design and explained in more detail below, are used above all where there is space constraint To transmit sound signals from two different signal sources using only one membrane.
So ist es beispielsweise in der Fernsehtechnik bei stereotonübertragenen Fernsehsendungen üblich, die aus dem linken und rechten Tonkanal ausgetrennten Baßsignale mittels eines Doppelspulenlautsprechers wiederzugeben. Dazu weist dieser Doppelspulenlautsprecher auf dem Schwingspulenträger zwei spulenförmig ausgebildete Wickelverbände auf, wobei jeder Windung des ersten Wickelverbandes eine Windung des anderen Wickelverbandes nebengeordnet ist. Sind die Wickelverbände mehrlagig um den Schwingspulenträger herumgelegt, ändert dies in den jeweiligen Lagen nicht die zuvor beschriebene Anordnung der Windungen der beiden Wickelverbände zueinander. Lediglich die einzelnen Wicklungen einer unteren Lage werden in der darüberliegenden Lage von Windungen überdeckt, die jeweils einem anderen Wickelverband angehören. Die Windungen aller Wickelverbände haben üblicherweise den gleichen Drahtquerschnitt.For example, it is common in television technology for stereo broadcast television broadcasts that result from the left and right sound channel separated bass signals to play using a double coil speaker. For this purpose, this double-coil loudspeaker has two coil-shaped winding assemblies on the voice coil support, with one turn of the other winding assembly being arranged next to each turn of the first winding assembly. If the winding formations are laid around the voice coil former in multiple layers, this does not change the arrangement of the turns of the two winding formations described above in relation to one another in the respective positions. Only the individual windings in a lower layer are covered by windings in the layer above, which each belong to a different winding structure. The windings of all winding formations usually have the same wire cross-section.
Mittels dieser bekannten Anordnung ist eine gute Wiedergabequalität zweier, jedoch dem gleichen Frequenzspektrum angehöriger Tonsignale möglich. Dies ist nach Erkenntnissen der Anmelderin darauf zurückzuführen, daß für die zu übertragenden Frequenzspektren die wirksame Leiterlänge der beiden Wickelverbände der Dicke der den Wickelverbänden benachbarten Polplatte beziehungsweise die Dicke dieser Polplatte den wirksamen Leiterlängen angepaßt ist. Unter wirksamer Leiterlänge wird in diesem Zusammenhang die Längsausdehnung der Wickelverbände auf dem Schwingspulenträger parallel zur Mittelachse des Lautsprechers verstanden. Nach dieser Erklärung ist auch aus sich heraus verständlich, warum bei der Beaufschlagung der beiden Wickelverbände mit Tonsignalen unterschiedlicher Frequenzspektren die Tonwiedergabequalität gegenüber Einzelspulenlautsprechern vermindert ist. Die bekannte Wicklungsausgestaltung mit einander nebenliegenden Windungen unterschiedlicher Wickelverbindungen bewirkt, daß nur ein Wickelverband hinsichtlich der wirksamen Leiterlänge auf das zu übertragende Frequenzspektrum optimal ausgelegt sein kann. Aber auch der Wickelverband, dessen wirksame Leiterlänge optimiert ist, ist noch keine Garantie für ein gutes Klangwiedergabeverhalten. Dies deshalb, weil durch die bekannte Anordnung der Wickelverbände auf dem Schwingspulenträger der nicht optimierte Wickelverband dem optimierten Wickelverband eine gegenüber einem Einzelspulenlautsprecher erhöhtes Ballastgewicht entgegen bringt.With this known arrangement, a good reproduction quality of two, but belonging to the same frequency spectrum, sound signals is possible. According to the applicant's knowledge, this can be attributed to the fact that the effective conductor length of the two winding assemblies is matched to the thickness of the pole plate adjacent to the winding assemblies or the thickness of this pole plate is adapted to the effective conductor lengths for the frequency spectra to be transmitted. In this context, the effective conductor length is understood to mean the longitudinal extension of the winding formations on the voice coil former parallel to the central axis of the loudspeaker. According to this explanation, it is also understandable in itself why the sound reproduction quality is reduced compared to single-coil loudspeakers when the two winding groups are subjected to sound signals of different frequency spectra. The well-known winding design with adjacent Windings of different winding connections have the effect that only one winding group can be optimally designed with regard to the effective conductor length for the frequency spectrum to be transmitted. But the winding bandage, whose effective conductor length is optimized, is still no guarantee of good sound reproduction behavior. This is because, due to the known arrangement of the winding associations on the voice coil former, the non-optimized winding association counteracts the optimized winding association with an increased ballast weight compared to a single-coil loudspeaker.
Aus der Schrift US-A-4 897 877, welche den Oberbegriff der vorliegenden Anmeldung bildet, ist eine Anordnung bekannt, bei welcher der zweite Wickelverband gegenüber dem ersten Wickelverband eine verminderte Längsausdehnung aufweist, indem dieser um den Außenmantel des ersten Wickelverbandes gewickelt ist. Beide Wickelverbände werden mit Tonsignalen einer Tonsignalquelle beaufschlagt. Solche Anordnungen haben sich jedoch in der Praxis nicht durchgesetzt, weil die Tonwiedergabe mittels derartig modifizierter Lautsprecher insgesamt als nicht befriedigend angesehen wurde.
Daher liegt der Erfindung die Aufgabe zugrunde, derartige Doppelspulenlautsprecher einem größeren Anwendungsfeld zuzuführen.From the document US-A-4 897 877, which forms the preamble of the present application, an arrangement is known in which the second winding bandage has a reduced longitudinal extent compared to the first winding bandage, in that the latter is wound around the outer jacket of the first winding bandage. Both winding groups are supplied with sound signals from a sound signal source. However, such arrangements have not become established in practice because the sound reproduction using loudspeakers modified in this way was considered unsatisfactory overall.
The object of the invention is therefore to supply such double-coil loudspeakers to a larger field of application.
Diese Aufgabe wird mit den Merkmalen gemäß Anspruch 1 gelöst. Wird nämlich der äußere Wickelverband lediglich von einer Sprachsignalquelle beaufschlagt, wird durch den wickelmäßigen Aufwand für die Sprachwiedergabe die Tonwiedergabe der zweiten Tonsignalquelle (etwa einer Stereoanlage) nicht beeinträchtigt. Besonders vorteilhaft ist es, den angegebenen Doppelspulenlautsprecher in Kraftfahrzeugen, die über eine Autotelefonanlage mit Freisprechfunktionen verfügen, einzusetzen, da der erfindungsgemäße Doppelspulenlautsprecher mit seinem ersten Wickelverband als Lautsprecher für die Audioanlage des Kraftfahrzeugs und mit seinem zweiten Wickelverband als Lautsprecher für die Sprachwiedergabe des Telefons mit Freisprechbetrieb verwendet werden kann. Bei dieser Anordnung entfällt auch eine Umschalteinheit, die dann erforderlich ist, wenn wie herkömmlich die Konuslautsprecher der Audioanlage gleichzeitig die Tonwiedergabe des Telefons übernehmen.This object is achieved with the features according to claim 1. If the outer winding bandage is only acted upon by a speech signal source, the sound reproduction of the second sound signal source (such as a stereo system) is not impaired by the winding effort for speech reproduction. It is particularly advantageous to use the specified double coil loudspeaker in motor vehicles which have a car telephone system with hands-free functions, since the double coil loudspeaker according to the invention with its first winding assembly as loudspeaker for the audio system of the motor vehicle and with its second winding assembly as loudspeaker for the speech reproduction of the telephone with hands-free operation can be used. This arrangement also eliminates the need for a switchover unit, which is required when the cone loudspeakers of the audio system simultaneously take over the sound reproduction of the telephone, as is conventional.
Es zeigen
- Figur 1:
- einen dynamischen Konuslautsprecher mit herkömmlicher Doppelspulenausbildung im Schnitt, und
- Figur 2:
- einen dynamischen Konuslautsprecher mit erfindungsgemäßer Doppelspulenausbildung im Schnittpunkt.
- Figure 1:
- a dynamic cone speaker with conventional double coil training on average, and
- Figure 2:
- a dynamic cone loudspeaker with inventive double coil design at the intersection.
Die Erfindung soll nun anhand der beiden Figuren näher erläutert werden.The invention will now be explained in more detail with reference to the two figures.
Der in Figur 1 veranschaulichte, herkömmlich ausgebildete Doppelspulenlautsprecher weist einen konusförmigen Korb 10 auf, in welchem die ebenfalls konusförmige Membran 11 eingesetzt ist. Die Membran 11 und der Korb 10 sind an ihren Enden, die jeweils die größeren Durchmesser aufweisen, miteinander verbunden. Das Ende der Membran 11, welches den kleineren Durchmesser aufweist, ist durch eine zum anderen Ende der Membran 11 hinweisende, halbkugelförmig ausgebildete Staubschutzkappe 12 abgedeckt.The conventionally designed double-coil loudspeaker illustrated in FIG. 1 has a
An dem Ende des Korbes 10, mit dem kleineren Durchmesser, ist zentrisch zur Mittelachse des Lautsprechers ein kreisringförmiger Dauermagnet 13 angesetzt, wobei zwischen dem Ende des Korbes 10 und dem Dauermagneten 13 noch eine ebenfalls kreisringförmig ausgebildete, jedoch einen kleineren Innendurchmesser als der Dauermagnet 13 aufweisende Polplatte 14 zwischengeordnet ist. Die andere, dem Korb 10 abgewandte Kreisringfläche des Dauermagneten 13 ist mit einer scheibenförmigen zweiten Polplatte 15 abgedeckt.At the end of the
Der auf der zum Korb 10 hinweisenden Fläche der zweiten Polplatte 15, zentrisch zur Mittelachse des Lautsprechers aufgesetzte Polkern 16 wird über seine gesamte Baulänge unter Einhaltung eines bestimmten Abstandes vom Dauermagneten 13 und der ersten Polplatte 14 ummantelt. An das Ende der Membran 11, welches den kleineren Durchmesser aufweist, ist ein rohrförmiger Schwingspulenträger 17 angesetzt. Dieser Schwingspulenträger 17, dessen Innendurchmesser den Außendurchmesser des Polkerns 16 knapp überschreitet, ist zum Polkern 16 geführt und ummantelt diesen an dem oberen, freien Ende, indem er in den vom Dauermagneten 13 und der ersten Polplatte 14 sowie dem Polkern 16 gebildeten Abstand hineinragt.The
Zwischen der Innenfläche des Korbes 10 und dem Ende des Schwingspulenträgers 17, welches der Membran 11 zugewandt ist, ist eine ziehharmonikaförmig ausgebildete Zentriermembran 18 angeordnet. Diese sorgt während des Betriebs des Lautsprechers dafür, daß der Schwingspulenträger 17 immer zentrisch zur Mittelachse des Lautsprechers steht.Between the inner surface of the
Um den Außenmantel 19 des Schwingspulenträgers 17 sind benachbart zur ersten Polplatte 14 zwei spulenförmig ausgebildete Wickelverbände 20,21 gelegt. Wie Figur 1 deutlich hervorhebt, ist in vertikaler Ausdehnung jeder Windung 22 eines ersten Wickelverbandes 20 eine Windung 22 des anderen Wickelverbandes 21 nebengeordnet. Diese Anordnung der Windungen 22 zueinander gilt auch in horizontaler Ausdehnung, wenn, wie in Figur 1 dargestellt, die Wickelverbände 20,21 mehrlagig um den Schwingspulenträger 17 gelegt sind. Der Querschnitt des Windungsdrahtes ist für beide Wickelverbände 20,21 gleich. Die Längsausdehnung der Wickelverbände 20,21 auf dem Schwingspulenträger 17 ist so gewählt, daß Ruhezustand des Lautsprechers die Wickelverbände 20,21 etwa mittig zu der innen nebengeordneten ersten Polplatte 14 stehen. Die Enden 23 des Wickeldrahtes eines jeden Wickelverbandes 20,21 sind zu den am Korb 10 angeordneten Anschlußklemmen 24,25 geführt.Around the
Ein erfindungsgemäß ausgebildeter Doppelspulenlautsprecher ist in Figur 2 veranschaulicht. Dieser unterscheidet sich von dem in Figur 1 beschriebenen Doppelspulenlautsprecher durch eine andere Anordnung der Wickelverbände 20,21 auf dem Schwingspulenträger 17.A double coil loudspeaker designed according to the invention is illustrated in FIG. 2. This differs from the double coil loudspeaker described in FIG. 1 by a different arrangement of the
Wie Figur 2 deutlich zeigt, ist ein erster Wickelverband 20 mehrlagig um den Außenmantel 19 des Schwingspulenträgers 17 gelegt. Auf diesen Wickelverband 20 ist der zweite Wickelverband 21 ebenfalls mehrlagig aufgelegt. Im Gegensatz zum ersten Wickelverband 20 zeichnet sich dieser Wickelverband 21 durch einen verminderten Drahtquerschnitt und eine verminderte Wickelbreite in Längsrichtung des Schwingspulenträgers 17 aus. In Ruhestellung des Lautsprechers überragen auch hier die Längsausdehnungen beider Wickelverbände 20,21, die ihnen nebengeordnete erste Polplatte 14 mit gleichem Abstand.As FIG. 2 clearly shows, a
Durch den schichtweisen Aufbau der beiden Wickelverbände 20,21 auf dem Schwingspulenträger 17 ist somit auch ohne weiteres nachvollziehbar, daß die wirksame Leiterlänge eines jeden Wickelverbandes 20, 21 dem jeweils zu übertragenden Frequenzspektrum angepaßt werden kann. Wird der zweite Wickelverband 21 für die Sprachwiedergabe eines Telefontons ausgelegt, hat dieser Wickelverband 21 wegen seines geringen Gewichtes keinen Einfluß auf die Wiedergabequalität des für ein anderes Frequenzspektrum ausgelegten anderen Wickelverbandes 20.Due to the layered structure of the two
Claims (2)
- Double-coil loudspeaker,- with a cone-shaped frame (10),- with a diaphragm (11) of likewise cone-shaped construction, that is mounted in the frame (10) and to which it is joined at the end of the diaphragm (11) having the greater diameter,- with a circular permanent magnet (13) at whose one circular face a likewise circular first pole plate (14), having a smaller internal diameter compared to the permanent magnet (13), is arranged, and at whose other circular face a second pole plate (15) of disc-shaped construction is arranged centrally to the centre axis, and which circular permanent magnet (13) is joined at the side provided with the first pole plate (14) to the end of the cone-shaped frame (10) which has the smaller diameter,- with a cylindrical pole core (16) arranged centrally to the centre axis, whose one end is joined to the second pole plate (15) and which cylindrical pole core (16) is enclosed over its overall length by the permanent magnet (13) and the first pole plate (14), a distance being maintained between said cylindrical pole core (16), said permanent magnet (13) and said first pole plate (14),- with a voice coil former (17) of tubular construction, whose internal diameter barely exceeds the external diameter of the pole core (16), and is less than the internal diameter of the first pole plate (14), and which encloses with its one end one part of the free end of the pole core (16), and which is joined by its other end to the end of the cone-shaped diaphragm (11) having the smaller diameter,- with a spider (18) that is arranged between the inside of the frame (10) and the outer face (19) of the voice coil former (17) in the region of the junction with the diaphragm (11), and which maintains the voice coil former (17) centrally to the pole core (16),- with two coil-type winding assemblies (20, 21) each arranged on the outer face (19) of the voice coil former (17), whereby in the rest position of the system the longitudinal extensions of the winding assemblies (20, 21) on the voice coil former (17) are equally spaced from the first pole plate (14) adjacent to the winding assemblies (20, 21), and whereby the longitudinal and transverse extension of the second winding assembly (21) is reduced in relation to the longitudinal and transverse extension of the first winding assembly (20),- with terminals (24, 25) to which the two wire ends (23) of each winding assembly (20, 21) are led,characterised in that- the first winding assembly (20) is arranged in single or multiple layers one above the other on the outer face (19) of the voice coil former (17),- the second winding assembly (21) is laid around the first winding assembly (20) on a part of its surface, preferably in the region that is arranged adjacent to the first pole plate (14) in the rest position of the system,- each winding assembly (20, 21) is fed from an audio signal source carrying independent and different audio signals, whereby the voice signals of a telephone system are fed exclusively to the second winding assembly (21), and- the first winding assembly (20) is designed for the reproduction of the low and broad-band audio spectrum.
- Double-coil loudspeaker according to Claim 1,
characterised in that
the wire diameter of the second winding assembly (21) is reduced in relation to the wire diameter of the first winding assembly (20).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4025591A DE4025591A1 (en) | 1990-08-13 | 1990-08-13 | DOUBLE COIL SPEAKER |
| DE4025591 | 1990-08-13 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0471990A2 EP0471990A2 (en) | 1992-02-26 |
| EP0471990A3 EP0471990A3 (en) | 1992-08-19 |
| EP0471990B1 true EP0471990B1 (en) | 1995-04-19 |
Family
ID=6412140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91112202A Expired - Lifetime EP0471990B1 (en) | 1990-08-13 | 1991-07-20 | Double-coil loudspeaker |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0471990B1 (en) |
| JP (1) | JPH04234300A (en) |
| DE (2) | DE4025591A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014175724A1 (en) | 2013-04-26 | 2014-10-30 | Knowles Ipc (M) Sdn. Bhd. | Double coil speaker |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19953119C2 (en) * | 1999-11-04 | 2003-03-20 | Harman Audio Electronic Sys | Audio amplifier with a clocked power amplifier |
| FR2807262B1 (en) * | 2000-04-03 | 2003-02-14 | Sagem | MOBILE PHONE WITH IMPROVED SPEAKER |
| KR20060102199A (en) * | 2005-03-23 | 2006-09-27 | 주식회사 청음전자 | Speaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1487376C3 (en) * | 1965-07-16 | 1975-01-16 | N.V. Philips' Gloeilampenfabrieken, Eindhoven (Niederlande) | Method for connecting the membrane, voice coil bobbin and, if necessary, centering means of electrodynamic transducers |
| US4088847A (en) * | 1975-12-11 | 1978-05-09 | Matsushita Electric Industrial Co., Ltd. | Speaker voice coil construction |
| DE3208409A1 (en) * | 1982-03-09 | 1983-09-15 | Hagenuk GmbH, 2300 Kiel | Dynamic sound transducer |
| US4897877A (en) * | 1987-05-18 | 1990-01-30 | Oxford Speaker Company | Sub-woofer driver combination with dual voice coil arrangement |
-
1990
- 1990-08-13 DE DE4025591A patent/DE4025591A1/en not_active Withdrawn
-
1991
- 1991-07-20 DE DE59105234T patent/DE59105234D1/en not_active Expired - Fee Related
- 1991-07-20 EP EP91112202A patent/EP0471990B1/en not_active Expired - Lifetime
- 1991-07-29 JP JP3210352A patent/JPH04234300A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014175724A1 (en) | 2013-04-26 | 2014-10-30 | Knowles Ipc (M) Sdn. Bhd. | Double coil speaker |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0471990A3 (en) | 1992-08-19 |
| DE59105234D1 (en) | 1995-05-24 |
| EP0471990A2 (en) | 1992-02-26 |
| JPH04234300A (en) | 1992-08-21 |
| DE4025591A1 (en) | 1992-02-20 |
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