EP0945043B1 - Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer - Google Patents

Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer Download PDF

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Publication number
EP0945043B1
EP0945043B1 EP98900977A EP98900977A EP0945043B1 EP 0945043 B1 EP0945043 B1 EP 0945043B1 EP 98900977 A EP98900977 A EP 98900977A EP 98900977 A EP98900977 A EP 98900977A EP 0945043 B1 EP0945043 B1 EP 0945043B1
Authority
EP
European Patent Office
Prior art keywords
transducer
closing member
annular
axis
annular body
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
EP98900977A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0945043A1 (en
Inventor
Peter Bleim
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 EP98900977A priority Critical patent/EP0945043B1/en
Priority claimed from PCT/IB1998/000149 external-priority patent/WO1998038834A1/en
Publication of EP0945043A1 publication Critical patent/EP0945043A1/en
Application granted granted Critical
Publication of EP0945043B1 publication Critical patent/EP0945043B1/en
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
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/06—Arranging circuit leads; Relieving strain on circuit leads
    • 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

Definitions

  • the invention relates to an electroacoustic transducer comprising a diaphragm which is substantially centro-symmetrical with respect to a transducer axis and which is capable of vibrating in the direction of the transducer axis, and comprising a voice coil connected to the diaphragm in the area of the rear volume of the transducer, and comprising a magnet system which is substantially centro-symmetrical with respect to the transducer axis, which magnet system is accommodated in a housing of the transducer and comprises a magnet, a cover disc adjoining the magnet, and a substantially pot-shaped yoke comprising a core disc, which also adjoins the magnet, and a hollow cylindrical yoke portion which projects from the core disc in a direction parallel to the transducer axis, and which forms an annular air gap between the cover disc and the hollow cylindrical yoke portion, in which air gap the voice coil is arranged, and comprising a substantially annular closing member adapted to close the rear volume, which closing member
  • An electroacoustic transducer of the type defined in the opening paragraph is commercially available from the Applicant under the type designation WD 00917 and is known therefrom.
  • the known transducer comprises a substantially cylindrical magnet system which comprises a circular cover disc, a round disc-shaped magnet and a pot-shaped yoke which comprises a round disc-shaped base from which a hollow cylindrical yoke portion projects at the location of its perimeter, which portion changes into peripheral pot wall which extends transversely to the transducer axis.
  • this magnet system is accommodated in a plastic transducer housing.
  • the closing member for closing the rear volume of the known transducer is formed by a ring-like closing cap, which is also made of a plastic and which comprises a hollow cylindrical closing wall, which extends parallel to the transducer axis, and an annular closing disc, which is connected to this closing wall and which has a circular opening.
  • the ring-like closing cap provided as the closing member is connected to the transducer housing with its hollow cylindrical closing wall, i.e. with the peripheral face of this wall, by ultrasonic welding in a mechanically rigid and acoustically sealed manner. With its opening the annular closing disc is slid onto the pot-shaped yoke of the magnet system, i.e.
  • the closing cap to the transducer housing in a mechanically rigid as well as acoustically sealed manner and, in addition, to adapt the inner diameter of the annular closing disc of the closing cap and the outer diameter of the hollow cylindrical yoke portion of the yoke system accurately to one another.
  • Both the acoustically sealed connection to the housing of the transducer and said adaptation of the diameters constitute an additional operation, which makes the transducer more expensive and should therefore be avoided.
  • the magnet system is substantially hollow cylindrical and comprises an annular magnet and an annular cover disc as well as a hollow cylindrical yoke having an annular core disc from which the hollow cylindrical yoke portion projects in the area of its inner diameter
  • the closing member comprises an annular body having an annular contact surface which extends transversely to the transducer axis and with which it faces the contact portion of said part of the transducer, which contact portion also extends transversely to the transducer axis, and a ring projection, which projects obliquely from the annular body along its entire circumference and is movable against spring action, by means of which ring projection an acoustic sealing with a mating surface can be achieved, and the at least one passage terminates in the annular contact surface of the annular body, which surface extends transversely to the transducer axis.
  • the closing member can initially be connected to the transducer without an acoustically sealed connection being made between the annular body of the closing member and the transducer portion adapted to cooperate with the annular body, and that an acoustically sealed connection between the ring projection and the mating surface and an acoustically sealed connection between the annular contact surface of the annular body of the closing member and the annular contact portion of the transducer part adapted to cooperate with the annular body is not formed until the transducer is mounted in an electroacoustic device, the ring projection of the closing member then being resiliently urged against a mating surface of the electroacoustic device, while at the same time the acoustic impedance between the rear volume of the transducer and the acoustic free space surrounding the transducer is formed by means of the at least one passage, which acoustic impedance is required in order to obtain a desired acoustic characteristic of the transducer.
  • the closing member in the transducer in accordance with the invention has both a positioning function and a fixing function because by means of the closing member the transducer is held in a desired operating position in an electroacoustic device in a stable manner after the transducer has been mounted into this device.
  • a further additional function of the closing member in the transducer in accordance with the invention is that by means of the closing member, i.e. by means of the ring projection of the closing member, it is possible to compensate for mounting height tolerances.
  • the ring projection can project obliquely from the annular body towards the transducer axis. It has proved to be particularly advantageous if the ring projection of the closing member projects from the annular body of the closing member in a direction away from the transducer axis. Thus, a comparatively large diameter of the ring projection is obtained, which has proved to be advantageous because in this way a gentle spring action can be achieved by means of the ring projection.
  • a transducer in accordance with the invention it has further proved to be advantageous if a plurality of stabilizing projections, which are spaced at equal angles from one another, project obliquely from the annular body of the closing member in directions with respect to the transducer axis which are opposite to that of the ring projection. This ensures that in the built-in condition of the transducer the annular contact surface of the annular body of the closing member always closely engages with the contact portion of the transducer part adapted to cooperate with the annular body, thereby guaranteeing a proper acoustically sealed connection between the contact surface and the contact portion.
  • the closing member comprises a given number of stabilizing projections and an equal number of passages, and each stabilizing projection and each passage is disposed symmetrically with respect to a radial direction. This results in a close and relatively large-area engagement of the contact surface of the annular body of the closing member and the contact portion of a transducer part adapted to cooperate with the annular body.
  • the closing member is made of a plastic, preferably polyacetal.
  • a plastic preferably polyacetal.
  • such a construction has proved to be particularly favorable because particularly polyacetal has satisfactory spring characteristics and a high temperature stability.
  • transducer in accordance with the invention it has further proved to be particularly advantageous if the transducer can be provided with differently constructed closing members which differ from one another with respect to the implementation of the passages provided in order to realize acoustic frictions and which consequently result in different acoustic characteristics of the transducer.
  • a plurality of variants of a transducer in accordance with the invention which differ from one another with respect to their acoustic characteristics, can be realized in a simple manner and substantially without additional expense.
  • Figure 1 is an underneath view taken at the arrow I in Figure 2 and showing a basic unit of an electrodynamic transducer in accordance with a first embodiment of the invention, to which unit a closing member can be connected.
  • Figure 2 shows the basic unit in a side view taken at the arrow II-II in Figure 1 and partly in sectional view.
  • Figure 3 shows the basic unit of Figures 1 and 2 in a plan view taken at the arrow III in Figure 2.
  • FIG 4 similarly to Figure 2, shows the electroacoustic transducer in accordance with the first embodiment of the invention, the basic unit and the closing member of the transducer being connected to one another.
  • Figure 5 shows the closing member of the transducer of Figure 4 in a cross-sectional view taken on the line V-V in Figure 6.
  • Figure 6 shows the closing member of Figure 5 in a plan view taken at the arrow VI in Figure 5.
  • Figure 7 shows a part of the closing member of Figures 5 and 6 in a sectional view taken on the line VII-VII in Figure 6 and to an enlarged scale in comparison with Figure 6.
  • Figure 8 shows diagrammatically a part of a portable telephone including an electroacoustic transducer in accordance with a second embodiment of the invention.
  • FIGS 1 to 3 show a basic unit B of an electrodynamic transducer 1 in a first embodiment of the invention, which is shown as a whole in Figure 4 and which has 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 1 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 is accommodated in the housing 3 and comprises an annular magnet 10, also referred to as the 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 hollow cylindrical yoke 13 at its lower side.
  • the yoke 13 comprises the annular core disc 12 and a hollow cylindrical yoke portion 14, which projects from said disc in a direction parallel to the transducer axis 2 and 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 is centro-symmetrical with respect to the transducer axis 2 and can perform excursions in the direction of the transducer axis 2.
  • the voice coil 16 is disposed in the rear volume HV of the transducer 1.
  • 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 8, 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 one 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 I 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 as can be seen in Figure 1, further comprises a substantially annular closing member 30 for closing the rear volume HV.
  • This closing member 30 is shown separately in Figures 5, 6 and 7.
  • the closing member 30 as shown in Figures 5 to 7 is made of a plastic, preferably polyacetal because this synthetic material has suitable spring characteristics and a high temperature stability.
  • the closing member 30 With a contact surface 32, which extends parallel to a circle 31 which is concentric with the transducer axis 2, the closing member 30 lies against a contact portion 33 of a part of the transducer 1, which portion is shown diagrammatically in dash-dot lines in Figure 1, which part of the transducer 1 in the present case is formed by the yoke 13 of the magnet system 9 , i.e. by the annular core disc 12 of the yoke 13 of the magnet system 9.
  • the closing member 30 has a total of four passages 34, 35, 36 and 37 which open into its contact surface 32 and which serve to obtain an acoustic friction between the rear volume HV of the transducer 1 and the acoustic free space surrounding the transducer 1.
  • the closing member 30 comprises an annular body 38 whose annular contact surface 32, which in the present case extends transversely to the transducer axis 2, faces the contact portion 33 of said part of the transducer 1, i.e. the contact portion 33 of the yoke 13, which also extends transversely to the transducer axis 2, and further comprises a ring projection 39, which projects obliquely from the annular body 38 along its entire circumference and is movable against spring action.
  • the spring action is mainly provided by means of an annular thinner portion Z between the annular body 38 and the ring projection 39.
  • An acoustic sealing with the ring projection 39 can be achieved with a mating surface 40.
  • Such a mating surface 40 is shown diagrammatically in Figure 4.
  • the mating surface 40 has been provided on a supporting wall 41, shown in dash-dot lines in Figure 4, of an electroacoustic device, which is not shown any further in Figure 4.
  • the supporting wall 41 serves for closing the rear volume HV of the transducer 1.
  • each of the passages 34, 35, 36 and 37 terminates in the annular contact surface 32 of the annular body 38, which surface extends transversely to the transducer axis 2.
  • the ring projection 39 advantageously projects from the annular body 38 in a direction away from the transducer axis 2.
  • the closing member 30 has four stabilizing projections 42, 43, 44 and 45 spaced at equal angles from one another.
  • the four stabilizing projections 42, 43, 44 and 45 project obliquely from the annular body 38 of the closing member 30 in directions with respect to the transducer axis 2 which are opposite to that of the ring projection 39.
  • the four stabilizing projections 42, 43, 44 and 45 thus point towards the transducer axis 2.
  • the four stabilizing projections 42, 43, 44 and 45 of the closing member 30 project from the annular body 38 of the closing member 30 at substantially the same angle as the ring projection 39.
  • the transducer 1 as shown in Figure 4 thus comprises a closing member 30 having a given number of stabilizing projections, i.e. four stabilizing projections 42, 43, 44 and 45, and an equal number of passages, i.e. four passages 34, 35, 36 and 37.
  • Each of the stabilizing projections 42, 43, 44 and 45 and each of the passages 34, 35, 36 and 37 are disposed symmetrically with respect to radial directions 46, 47, 48 and 49, respectively.
  • closing member 30 it is to be noted that in this closing member 30 four angularly equispaced projections 50, 51, 52 and 53, which extend substantially in the direction of the transducer axis 2, are connected to the annular body 38 of this transducer, by means of which projections the closing member 30 can be connected to the yoke 13 of the transducer 1 in order to retain the closing member 30.
  • the projections 50, 51, 52 and 53 each have a slot 54, 55, 56 and 57 so that the projections are cross-sectionally U-shaped, the limb portions of the of the projections 50, 51, 52 and 53 being resiliently movable towards one another when the projections 50, 51, 52 and 53 are inserted or introduced into the holes 58, 59, 60 and 61 provided for this purpose in the yoke 13.
  • the closing member is secured to the yoke 13 of the transducer 1 by means of the resilient action of the projections 50, 51, 52 and 53.
  • the transducer 1 shown in Figure 4 has been provided with the closing member 30 as shown in Figures 5 to 7, which closing member has passages 34, 35, 36 and 37 of substantially rectangular cross-sectional shape.
  • the basic unit B of the transducer 1 can be connected to differently constructed closing members, i.e. that a transducer can be provided with differently constructed closing members 30, which differ from one another with respect to the shapes of the passages provided in order to obtain acoustic frictions and which consequently give rise to different acoustic characteristics of the transducer.
  • closing member whose construction differs from that of the closing member 30 as shown in Figures 5 to 7 can have cross-sectionally rectangular passages whose sides have greater or smaller lengths or it can have cross-sectionally semicircular or wedge-shaped passages.
  • the closing member 30 can initially be connected to the transducer without an acoustically sealed connection being made between the annular body 38 of the closing member 30 and the yoke 13 of the magnet system 9 of the transducer 1, which yoke is adapted to cooperate with the annular body 38, and that an acoustically sealed connection between the ring projection 39 and the mating surface 40 and an acoustically sealed connection between the annular contact surface 32 of the annular body 38 of the closing member 30 and the annular contact portion 33 of the yoke 13 of the magnet system 9 of the transducer 1, which yoke is adapted to cooperate with the annular body 38, is not formed until the transducer 1 is mounted in an electroacoustic device, the ring projection 39 of the closing member 30 then being resiliently urged against a mating surface 40 of the electroacoustic device, while at the same time the acoustic impedance between the
  • the closing member 30 in the transducer 1 has both a positioning function and a fixing function because by means of the closing member 30 the transducer 1 is held in a desired operating position in an electroacoustic device in a stable manner after the transducer 1 has been mounted into this electroacoustic device, which is achieved mainly owing to the resilient action of the ring projection 39 of the closing member 30.
  • a further advantage of the closing member 30 is that by means of the closing member, i.e. by means of the ring projection 39 of the closing member, it is possible to compensate for mounting height tolerances. Since the ring projection 39 projects outwardly from the ring projection 38 a gentle spring action is achieved by means of the ring projection.
  • the provision of the stabilizing projections 42, 43, 44 and 45 guarantees that the contact surface 32 of the annular body 38 is always acoustically sealed with respect to the contact portion 33 of the yoke 13, even when in view of the available space the annular body 38 is comparatively narrow and is therefore dimensionally less stable.
  • Figure 8 shows a part of a portable telephone 62 having a housing 63 which accommodates a support 64 carrying a printed circuit board 65.
  • the telephone 62 includes an electroacoustic transducer 1 in accordance with a second embodiment of the invention.
  • the electroacoustic transducer 1 bears with its narrow annular bounding wall 5 on a positioning cylinder 66, which is also annular, the transducer 1 being urged against the positioning cylinder 66 by the resilient action of the ring projection 39, so that the transducer 1 is properly positioned and held in its operating position.
  • the closing member 30 of the transducer 1 shown in Figure 8 does not comprise any stabilizing projections.
  • the annular body 38 of the transducer 1 shown in Figure 1 is constructed so as to have a suitable dimensional stability.
  • two passages 34 and 36 of the closing member 30 are indicated by means of broken lines.
  • the ring projection of a closing member can be connected to the annular body without a thinner portion and can in itself be elastically deformable as a whole and can consequently be movable against spring action.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
EP98900977A 1997-02-28 1998-02-05 Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer Expired - Lifetime EP0945043B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98900977A EP0945043B1 (en) 1997-02-28 1998-02-05 Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP97890036 1997-02-28
EP97890036 1997-02-28
EP98900977A EP0945043B1 (en) 1997-02-28 1998-02-05 Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer
PCT/IB1998/000149 WO1998038834A1 (en) 1997-02-28 1998-02-05 Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer

Publications (2)

Publication Number Publication Date
EP0945043A1 EP0945043A1 (en) 1999-09-29
EP0945043B1 true EP0945043B1 (en) 2003-07-02

Family

ID=26148325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98900977A Expired - Lifetime EP0945043B1 (en) 1997-02-28 1998-02-05 Electroacoustic transducer comprising a closing member for closing the rear volume of the transducer

Country Status (4)

Country Link
EP (1) EP0945043B1 (ja)
JP (1) JP4126620B2 (ja)
AT (1) ATE244495T1 (ja)
DE (1) DE69816028T2 (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4665089B2 (ja) * 2001-03-07 2011-04-06 並木精密宝石株式会社 電磁誘導型アクチュエータ装置並びに携帯電話等を含む携帯用情報機器

Also Published As

Publication number Publication date
JP4126620B2 (ja) 2008-07-30
EP0945043A1 (en) 1999-09-29
DE69816028D1 (de) 2003-08-07
JP2000509935A (ja) 2000-08-02
DE69816028T2 (de) 2004-04-22
ATE244495T1 (de) 2003-07-15

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