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EP0943224B1 - Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure - Google Patents

Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure Download PDF

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Publication number
EP0943224B1
EP0943224B1 EP98900975A EP98900975A EP0943224B1 EP 0943224 B1 EP0943224 B1 EP 0943224B1 EP 98900975 A EP98900975 A EP 98900975A EP 98900975 A EP98900975 A EP 98900975A EP 0943224 B1 EP0943224 B1 EP 0943224B1
Authority
EP
European Patent Office
Prior art keywords
transducer
spring contacts
hollow cylindrical
bend
axis
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
Application number
EP98900975A
Other languages
German (de)
English (en)
Other versions
EP0943224A1 (fr
Inventor
Ewald Frasl
Erich Klein
Ernst Ruberl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to EP98900975A priority Critical patent/EP0943224B1/fr
Priority claimed from PCT/IB1998/000147 external-priority patent/WO1998038832A1/fr
Publication of EP0943224A1 publication Critical patent/EP0943224A1/fr
Application granted granted Critical
Publication of EP0943224B1 publication Critical patent/EP0943224B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention relates to an electroacoustic transducer comprising a substantially hollow cylindrical magnet system which is substantially centro-symmetrical with respect to a transducer axis, a diaphragm which is capable of vibrating in the direction of the transducer axis, a voice coil which is connected to the diaphragm, which has been wound from coil wire, and which has two coil leads, and two contact terminals which, viewed in the direction of the transducer axis, are disposed inside the substantially hollow cylindrical magnet system and which are each connected to one coil lead.
  • An electroacoustic transducer of the type defined in the opening paragraph is known from the document DE 25 03 828 C3.
  • the two contact terminals are formed by two contact pins which extend through the bottom wall of a pot-shaped supporting element and which are mechanically fastened to this bottom wall, as a result of which the contact faces formed by the contact tips of the contact pins are immovable, i.e. stationary.
  • an undesirable consequence of this is that when a known transducer is mounted in an electroacoustic device the two contact pins should enter into operative engagement either with resilient mating contacts or with stationary mating contacts which have been positioned very accurately with respect to the contact tips, in order to assure proper contact between the contact tips of the contact pins and the mating contacts.
  • the two contact pins have exactly equal radial distances from the transducer axis, as a result of which the known transducer cannot be mounted or built into an electroacoustic device in an arbitrary relative position because the contact pins do not enter into operative engagement with the mating contacts provided in the relevant electroacoustic device in the case of an incorrect relative position; this makes it more expensive to mount the known transducer.
  • an electrodynamic transducer of the type defined in the opening paragraph is characterized in that the contact terminals are formed by spring contacts formed with at least one bend, which spring contacts have at least two limbs which extend transversely to the transducer axis and which each have a first limb mechanically connected to a part of the transducer, and which each have a second limb having contact faces for engagement with mating contacts and whose contact faces are movable substantially parallel to the transducer axis, and the contact faces of both spring contacts have different radial distances from the transducer axis.
  • the construction of the contact terminals as spring contacts having at least one bend and having contact faces which are movable substantially parallel to the transducer axis ensures that contact faces of the spring contacts always engage properly with the mating contacts of an electroacoustic device, while dimensional tolerances can be substantially ignored. It is to be noted that according to the invention it is particularly advantageous that the spring contacts have at least one bend and the limbs of the spring contacts extend transversely to the transducer axis, because in this way the construction of the spring contacts and, as a consequence, of the entire transducer is also very compact in radial directions.
  • the construction of the spring contacts with at least one bend further has the advantage that it is possible to accommodate both spring contacts almost wholly inside the hollow cylindrical magnet system.
  • a transducer in accordance with the invention can be mounted in any desired relative position in an electroacoustic device in which the contacts adapted to mate with the spring contacts are annular and coaxial with the transducer axis, i.e. the transducer need not be brought into a given relative position, which has the advantage that mounting of the transducer in such a device can be as simply as possible.
  • the first limbs of the spring contacts formed with at least one bend are mechanically connected to a bottom wall of a substantially pot-shaped contact holder which is mounted in a hollow cylindrical part of the magnet system with its hollow cylindrical circumferential wall. This is advantageous for a simple mounting of the spring contacts in a transducer in accordance with the invention.
  • a transducer in accordance with the invention it has further proved to be very advantageous if the two spring contacts formed with at least one bend are disposed at least for the greater part inside the substantially hollow cylindrical magnet system, also viewed in a direction transverse to the transducer axis. In this way, the dimension of a transducer in accordance with the invention can also be particularly small in the direction of the transducer axis.
  • the spring contacts can be situated wholly inside the substantially hollow cylindrical magnet system, viewed in a direction perpendicular to the transducer axis.
  • the contact faces of the two spring contacts formed with at least one bend are disposed outside the substantially hollow cylindrical magnet system, viewed in a direction transverse to the transducer axis. This is advantageous for an as simple as possible engagement of the spring contacts with mating contacts of an electroacoustic device when a transducer in accordance with the invention is mounted in such an electroacoustic device.
  • the spring contacts can be formed with two bends, i.e. essentially S-shaped.
  • a construction with more bends is also possible.
  • the two spring contacts are formed with only one bend and, as a consequence, are substantially U-shaped. This is a satisfactory compromise between a compact construction and a gentle spring characteristic.
  • transducer in accordance with the invention are characterized in that the value of the outer diameter of the transducer is at the most 20.0 mm. These transducers consequently have a particularly compact construction.
  • FIGS 1 to 3 show an electrodynamic transducer 1 having a transducer axis 2.
  • the housing 3 essentially comprises a hollow cylindrical circumferential wall 4, which changes into a narrow annular bounding wall 5 at the top and which has three mounting projections 6, 7 and 8 at the bottom, which are spaced at equal angles from one another.
  • the mounting projections 6, 7 and 8 Prior to assembly of the transducer I the mounting projections 6, 7 and 8 project from the circumferential wall 4 in axial directions and after all the parts of the transducer 1 have been mounted in the housing 3 said projections are bent by means of an ultrasonic process.
  • the transducer 1 comprises a substantially hollow cylindrical magnet system 9, which is substantially centro-symmetrical with respect to the transducer axis 2 and whose construction is apparent from Figure 2.
  • the magnet system 9 comprises a ring magnet 10, which is adjoined by an annular cover disc 11 at its upper side and by an annular core disc 12 of a yoke 13 at its lower side.
  • the yoke 13 comprises the annular core disc 12 and, in addition, a hollow cylindrical yoke portion 14, whose end which is remote from the core disc 12 extends into the area of the cover disc 11, namely in such a manner that an annular air gap 15 is formed between the cover disc 11 and the yoke portion 14.
  • a voice coil 16 wound from coil wire is arranged in the air gap 15 and is shown only diagrammatically in Figure 2 because such a construction of a coil wound from coil wire is generally known.
  • the voice coil 16 is secured to a diaphragm 17 by means of an adhesive joint, which diaphragm can perform excursions in the direction of the transducer axis 2.
  • the diaphragm 17 comprises a curved central portion 18 and an annular peripheral portion 19 which is connected to the cover disc 11 by an adhesive with its edge zone, which lies between the narrow annular bounding wall 5 of the housing 3 and the cover disc 11.
  • the cover disc 11, the ring magnet 10, the core disc 12 of the yoke 13 and the diaphragm 17 all have the same outer diameter, which is adapted accurately to the inner diameter of the circumferential wall 4 of the housing 3 in such a manner that the core disc 12 of the yoke 13, the ring magnet 10 as well as the cover disc 11 and, consequently, also the diaphragm 17 are positioned exactly with respect to the transducer axis 2 by means of the circumferential wall 4 of the housing 3.
  • This also results in an exact positioning of the voice coil 16 in the air gap 15, so that always an unimpeded vibration of the voice coil 16 is guaranteed.
  • the voice coil 16 made of coil wire has two coil leads 20, of which only one lead 20 is shown in Figure 2.
  • the transducer 1 further has two contact terminals, which are both shown in Figure 1, but only one of these contact terminals is visible in Figure 2.
  • Each of the two contact terminals is electrically connected to a coil lead, preferably by soldering but clamping is also possible. Viewed in the direction of the transducer axis, the two contact terminals are disposed inside the substantially hollow cylindrical magnet system 9.
  • the contact terminals in the transducer shown in Figures 1 to 3 are preferably formed by substantially U-shaped spring contacts 21 and 22 having limbs 23 and 24, which extend transversely to the transducer axis 2 and of which a first limb 23 is mechanically connected to a part of the transducer 1 and of which a second limb 24 has contact faces 25 for cooperation with mating contacts, which contact faces 25 are movable substantially parallel to the transducer axis 2.
  • the contact faces 25 are each formed by a spring contact portion bent away from the second limb 24.
  • the two contact faces 25 of the two spring contacts 21 and 22 are situated at different radial distances from the transducer axis 2, as is clearly shown in Figure 1.
  • the first limb 23 of each of the two spring contacts 21 and 22 is mechanically connected to a part of the transducer 1.
  • This part of the transducer 1 for mounting the two spring contacts 21 and 22 is formed by a substantially pot-shaped contact holder 26.
  • the first limbs 23 of the two U-shaped spring contacts 21 and 22 are mechanically connected to a bottom wall 27 of the pot-shaped contact holder 26.
  • the pot-shaped contact holder 26 is mounted in the hollow cylindrical yoke portion 14 of the yoke 13 of the magnet system 9.
  • each of the two U-shaped spring contacts 21 and 22 has a terminal lug 29, which is inclined relative to said limb and which extends through the bottom wall 27 of the pot-shaped contact holder 26 and is connected to a respective coil lead 20.
  • the two terminal lugs 29 provide an electrical connection between, on the one hand, the coil leads 20 and, consequently, the voice coil 26 and, on the other hand, the two U-shaped spring contact 21 and 22.
  • the U-shaped spring contacts 21 and 22 are situated inside the substantially hollow cylindrical magnet system 9, viewed in the direction of the transducer axis 2.
  • the two U-shaped spring contacts 21 and 22 of the transducer 1 as shown in Figures 1 to 3 are disposed at least for the greater part inside the substantially hollow cylindrical magnet system 9, also viewed in a direction transverse to the transducer axis 2.
  • Viewed in a direction transverse to the transducer axis 2 only the contact faces 25 of the two U-shaped spring contacts 21 and 22 are situated outside the substantially hollow cylindrical magnet system 9.
  • this transducer 1 is shown to an enlarged scale, i.e. approximately five times full scale. At full scale of the transducer 1 the value of the outer diameter D of the transducer 1 indicated in Figure 3 has a nominal value of 13.2 mm.
  • the transducer 1 is therefore particularly compact and is therefore very suitable for use in telecommunication devices, such as portable telephones and the like.
  • the transducer 1 can be mounted in an electroacoustic device in an arbitrary relative position if this device comprises a circular and an annular contact, which are both coaxial with the transducer axis 2, or two annular mating contacts, which are coaxial with the transducer axis 2, for cooperation with the spring contacts 21 and 22.
  • the invention is not limited to the embodiment described above by way of example.
  • the first limb 23 of the two U-shaped spring contacts 21 and 22 is fully straight, i.e. rectilinear. However, if desired, this first limb can also be bent if this is required in view of the available space or for reasons of design.
  • the outer second limb 24 covers the inner first limb 23 of each of the two U-shaped spring contacts 21 and 22 for the greater part, viewed in the direction of the transducer axis 2, since the two limbs 23 and 24 of each spring contact 21 or 22 extend parallel to one another.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)

Claims (6)

  1. Transducteur électroacoustique comprenant
    un système d'aimant cylindrique sensiblement creux (9) qui est sensiblement symétrique par rapport à un axe de transducteur (2) se trouvant au centre;
    une membrane (17) qui est capable de vibrer dans la direction de l'axe de transducteur (2) ;
    une bobine mobile (16) qui est connectée à la membrane (17), qui consiste en un enroulement de fil de bobine, et qui comprend deux conducteurs de bobine (20), et deux bornes de contact qui, vu dans la direction de l'axe de transducteur (2), sont disposées à l'intérieur du système d'aimant cylindrique sensiblement creux (9) et qui sont chacune connectées à un conducteur de bobine (20) ;
       caractérisé en ce que les bornes de contact sont formées par des contacts à ressort (21,22) présentant au moins un coude, lesquels contacts à ressort (21,22) comprennent au moins deux branches (23,24) qui s'étendent transversalement par rapport à l'axe de transducteur (2) et qui comprennent chacun une première branche (23) mécaniquement reliée à une partie du transducteur (1), et qui comprennent chacun une deuxième branche (24) comportant des faces de contact (25) pour la mise en prise avec des contacts correspondants et dont les faces de contact (25) peuvent se déplacer sensiblement parallèlement à l'axe de transducteur (2), et les faces de contact des deux contacts à ressort (21,22) présentent des distances radiales différentes par rapport à l'axe de transducteur (2).
  2. Transducteur (1) suivant la revendication 1, caractérisé en ce que les premières branches (23) des contacts à ressort (21,22) présentant au moins un coude sont mécaniquement reliées à une paroi de fond (27) d'un support de contact sensiblement en forme de pot (26) qui est monté dans une partie cylindrique creuse du système d'aimant (9) avec sa paroi circonférentielle cylindrique creuse (28).
  3. Transducteur (1) suivant la revendication 1 ou 2, caractérisé en ce que les deux contacts à ressort (21,22) présentant au moins un coude sont disposés au moins pour la majeure partie à l'intérieur du système d'aimant cylindrique sensiblement creux (9), également vu dans une direction transversale par rapport à l'axe de transducteur (2).
  4. Transducteur (1) suivant la revendication 3, caractérisé en ce que les faces de contact (25) des deux contacts à ressort présentant au moins un coude sont disposées à l'extérieur du système d'aimant cylindrique sensiblement creux (9), vu dans une direction transversale par rapport à l'axe de transducteur (2).
  5. Transducteur suivant l'une quelconque des revendications précédentes, caractérisé en ce que les deux contacts à ressort (21,22) ne présentent qu'un coude et, par conséquent, sont sensiblement en forme de U.
  6. Transducteur (1) suivant l'une quelconque des revendications précédentes, caractérisé en ce que la valeur du diamètre externe du transducteur (1) est au plus de 20mm.
EP98900975A 1997-02-28 1998-02-05 Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure Expired - Lifetime EP0943224B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98900975A EP0943224B1 (fr) 1997-02-28 1998-02-05 Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP97890035 1997-02-28
EP97890035 1997-02-28
PCT/IB1998/000147 WO1998038832A1 (fr) 1997-02-28 1998-02-05 Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure
EP98900975A EP0943224B1 (fr) 1997-02-28 1998-02-05 Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure

Publications (2)

Publication Number Publication Date
EP0943224A1 EP0943224A1 (fr) 1999-09-22
EP0943224B1 true EP0943224B1 (fr) 2003-06-25

Family

ID=26148324

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98900975A Expired - Lifetime EP0943224B1 (fr) 1997-02-28 1998-02-05 Transducteur electroacoustique comportant des contacts a ressort qui presentent au moins une courbure

Country Status (4)

Country Link
EP (1) EP0943224B1 (fr)
JP (1) JP4011630B2 (fr)
AT (1) ATE243909T1 (fr)
DE (1) DE69815808T2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3875150B2 (ja) 2002-06-13 2007-01-31 スター精密株式会社 電気音響変換器およびその製造方法

Also Published As

Publication number Publication date
ATE243909T1 (de) 2003-07-15
JP2000509934A (ja) 2000-08-02
DE69815808T2 (de) 2004-05-19
EP0943224A1 (fr) 1999-09-22
JP4011630B2 (ja) 2007-11-21
DE69815808D1 (de) 2003-07-31

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