EP1128705B1 - Lautsprecher - Google Patents

Lautsprecher Download PDF

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Publication number
EP1128705B1
EP1128705B1 EP20010301583 EP01301583A EP1128705B1 EP 1128705 B1 EP1128705 B1 EP 1128705B1 EP 20010301583 EP20010301583 EP 20010301583 EP 01301583 A EP01301583 A EP 01301583A EP 1128705 B1 EP1128705 B1 EP 1128705B1
Authority
EP
European Patent Office
Prior art keywords
diaphragm
voice coil
supporting member
coil
speaker
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
EP20010301583
Other languages
English (en)
French (fr)
Other versions
EP1128705A2 (de
EP1128705A3 (de
Inventor
Shigeru Sugiyama
Naohiro Fujinama
Hajime Kitamura
Yoshio Imahori
Hitoshi Yamashima
Masami Kushida
Hisashi Kubota
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.)
Star Micronics Co Ltd
Original Assignee
Star Micronics Co Ltd
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
Priority claimed from JP2000050197A external-priority patent/JP4261721B2/ja
Priority claimed from JP2000050198A external-priority patent/JP3619736B2/ja
Application filed by Star Micronics Co Ltd filed Critical Star Micronics Co Ltd
Publication of EP1128705A2 publication Critical patent/EP1128705A2/de
Publication of EP1128705A3 publication Critical patent/EP1128705A3/de
Application granted granted Critical
Publication of EP1128705B1 publication Critical patent/EP1128705B1/de
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
    • H04R9/04—Construction, mounting, or centering of coil

Definitions

  • the present invention relates to a dynamic speaker, and particularly to a structure for fixing a voice coil to a diaphragm in the dynamic speaker.
  • the dynamic speaker As one type of a speaker, a dynamic speaker has been known heretofore.
  • the dynamic speaker as disclosed in, for example, JP-A-6-178390 , comprises generally a diaphragm, a voice coil of which one end portion is fixed to the diaphragm, and a magnetic circuit unit defining a cylindrical magnetic gap for placing the other end portion of the voice coil therein.
  • One end portion 2a of a voice coil 2 having an I-shaped coiling section as shown in Fig. 13A is bonded and fixed to a diaphragm 4.
  • the fixing strength is insufficient. Accordingly, there is fear that the voice coil 2 peels off and separates from the diaphragm 4 during being used.
  • the voice coil 2 is easier to separate from the diaphragm.
  • JP-A-01215200 JP-A-56126399 and US-A-1962012 .
  • a speaker comprising:
  • the invention provides a speaker in which separation of a voice coil can be prevented without worsening acoustic characteristic of a dynamic speaker. Further, a coiling sectional shape of the voice coil has been improved by the invention.
  • the "coil supporting member”, as long as it supports one end portion of the voice coil in a state where it is caulked and fixed to the diaphragm by a plastic deformation of its caulking projection, is not particularly limited in its concrete constitution such as itsmaterial, its shape, a supporting method of voice coil, or the like.
  • the "caulking projection”, as long as the coil supporting member can be caulked and fixed to the diaphragm by its plastic deformation is not particularly limited in its concrete constitution such as its shape, its size, the number of the projections, arrangement, or the like.
  • the "diaphragm” and “magnetic circuit unit” are not particularly limited in their concrete constitution such as their material, shapes, and the like as long as they can be used as a component of the dynamic speaker.
  • the "voice coil” is not particularly limited in its concrete coiling sectional shape as long as its coiling thickness at the first portion is set larger than that at other portions.
  • the coiling thickness of the voice coil at the first portion is set larger than that at the other portions, the large bonding area between the first portion thereof and the diaphragm can be obtained without considerably increasing the weight of the voice coil. Therefore, it is possible to prevent the large load onto the bonding surface caused by the increase of the weight of the voice coil unlike the case where the coiling thickness of the voice coil is made large in whole, and the sufficient fixing strength of the voice coil in relation to the diaphragm can be obtained.
  • the coiling thickness of the voice coil at the other portions is set relatively small, it is not necessary to expand the width of the cylindrical magnetic gap in the magnetic circuit unit, and the large bonding area can be obtained between the first portion thereof and the diaphragm. Therefore, without lowering electroacoustic conversion efficiency of the speaker, the effects can be obtained.
  • the coiling section or voice coil is substantially L-shaped by forming a flange that protrudes inward in the radial direction at the first portion, the large bonding area can be obtained in a state where the increase of the weight of the voice coil is kept to a minimum. Further, without considerably complicating the coiling operation of the voice coil, the coiling thickness of the voice coil at the first portion thereof can be set larger than that at other portions.
  • the coil supporting member that supports the first portion of the voice coil is caulked to the diaphragm by subjecting the caulking projection formed in the coil supporting member to the plastic deformation. Therefore, the following effects that act on the invention can be obtained.
  • the voice coil is supported by the coil supporting member at the first portion thereof, it is not only directly fixed to the diaphragm by bonding but also indirectly fixed to the diaphragm through the coil supporting member. Therefore, the sufficient fixing strength of the voice coil in relation to the diaphragm can be obtained even if the coiling thickness of the voice coil is not made large and the large bonding area is not obtained between one end portion of the voice coil and the diaphragm unlike the conventional art.
  • it is not necessary to expand the width of the cylindrical magnetic gap between the magnetic circuit unit and the frame it is possible to previously prevent electroacoustic conversion efficiency of the speaker from lowering.
  • the coil supporting member is caulked to the diaphragm by the plastic deformation of its caulking projection, the diaphragm itself does not receive the excessive load at the caulking time. Accordingly, by providing the coil supporting member, it is possible to previously prevent deformation injurious to the acoustic property from occurring in the diaphragm.
  • the separation of the voice coil can be prevented without worsening acoustic property of the speaker in the dynamic speaker.
  • the direct fixing between the voice coil and the diaphragm by bonding may be omitted.
  • the bonding step or the like required conventionally when the voice coil is fixed to the diaphragm can be eliminated, the working efficiency in manufacture of speaker can be heightened greatly.
  • the voice coil can be surely supported by the coil supporting member, so that the fixing strength of the voice coil to the diaphragm can be sufficiently heightened. Therefore, the direct fixing between the voice coil and the diaphragm by bonding can be readily omitted.
  • the "flange portion” and “engaging portion” as long as the coil supporting member can support the voice coil by their fitting, are not particularly limited in the concrete constitution such as a sectional shape.
  • the concrete method of subjecting the caulking projection of the coil supporting member to the "plastic deformation" is not particularly limited.
  • the plastic deformation can be also performed by a mechanical method such as cold caulking.
  • a method can be also adopted, in which the caulking projection is subjected to a heat deformation by applying the ultrasonic vibration to the caulking projection.
  • caulk-fixing can be performed readily and reliably.
  • the diaphragm itself does not take direct part in caulk-fixing, it is not necessary entirely to take application of material of two members to fusion-bonding into consideration like a case where the two members are fusion-bonded by an ultrasonic wave. Accordingly, there is not restriction on selection freedom of material of the diaphragm, because the method in which the caulking projection is subjected to the heat deformation by applying the ultrasonic vibration is adopted.
  • the concrete constitution of the coil supporting member is not particularly limited. Further, in case that this coil supporting member is composed of an annular member, the caulking projections are formed at plural places in the coil supporting member at a predetermined interval in the circumferential direction, and plural through-holes into which these caulking projections are inserted are formed in the diaphragm; caulk-fixing can be performed in a state where the coil supporting member is exactly positioned in the predetermined position of the diaphragm.
  • the voice coil can be reliably supported by the coil supporting member. Therefore, also in case that fixing of the coil supporting member to the diaphragm is performed by other fixing methods than caulk-fixing, for example, by bonding, the fixing strength of the voice coil in relation to the diaphragm can be heightened in some degree.
  • Fig. 1 is a side sectional view of a speaker 10 according to a comparative example, in which the speaker faces upward
  • Fig. 2 is a detailed diagram of a 11 portion in Fig. 1 .
  • the speaker 10 is a dynamic speaker comprising a diaphragm 12, a frame 14, a voice coil 16 and a magnetic circuit unit 18.
  • the speaker 10 is a small-sized speaker having an outer diameter of about 30 mm, and used as, for example, a generator of alarm or the like, which is mounted on a base plate in a state where it has been stored in a case (not shown) and loaded on an automobile or the like.
  • the diaphragm 12 is a member having a plurality of unevenness formed concentrically, and the diaphragm 12 is formed by applying heat press molding to a synthetic resin film.
  • a peripheral edge flat portion 12a of the diaphragm 12 and a central flat portion 12b are located on the same horizontal annular plane.
  • the frame 14 is a steel member, and comprises a bottomed cylinder portion 14A located in the center and an annular mounting portion 14B that extends outward in the diameter direction from the vicinity of the upper end portion on the outer surface of this bottomed cylinder portion 14A.
  • a plurality of through-holes (not shown) is formed at a predetermined interval in the circumferential direction.
  • annular flat portion 14Ba located above an upper end surface 14Aa of the bottomed cylindrider portion 14A and a flange portion 14Bb extending upward from this annular flat portion 14Ba.
  • the diaphragm 12 at its peripheral edge flat portion 12a, is bonded and fixed to the annular flat portion 14Ba of the mounting portion 14B of the frame 14.
  • the bond-fixing is performed in a state where the diaphragm 12 and the frame 14 are arranged so as to be concentric with each other in relation to a central axis Ax of the speaker 10.
  • the voice coil 16 is arranged so as to be concentric with the diaphragm 12, and an upper end portion 16a (one end portion) of the voice coil 16 is bonded and fixed to the central flat portion 12b of the diaphragm 12.
  • the fixing structure will be described later.
  • the magnetic circuit unit 18 includes the bottomed cylinder portion 14A of the frame 14, a magnet 20 and a steel yoke 22. Both of the magnet 20 and yoke 22 are formed in the shape of a disk, placed on a bottom surface of the bottomed cylinder portion 14a in this order so as to be concentric with each other, and bonded and fixed to the frame 14.
  • the magnetic circuit unit 18 is set so that an upper end surface 22a of the yoke 22 has substantially the same height as the upper end surface 14Aa of the bottomed cylinder portion 14A, and a cylindrical magnetic gap G is formed, between the outer surface of the yoke 22 and the inner surface of the bottomed cylinder portion 14a, with the same width in the entire surrounding. And, in the cylindrical magnetic gap G, a lower portion 16b (other end portion) of the voice coil 16 is placed.
  • a coiling sectional shape of the voice coil 16 is set to a shape of L in which a flange portion 16a1 that protrudes inward in the radial direction is formed at an upper end portion 16a.
  • the bonding area between the upper end portion 16a of the voice coil 16 and the central flat portion 12b of the diaphragm 12 is sufficiently obtained.
  • the diaphragm 12 and voice coil 16 move up and down, when the speaker is driven, in a range shown by a two-dots chain line in Fig. 2 .
  • the height of the flange portion 16a1 is set so that clearance is provided in some degree between the flange portion 16a1 and the upper end surface 22a of the yoke 22 even when the vibration occurs with the maximum amplitude.
  • the voice coil 16 is formed using a coiling press jig 102 and a coiling receiver jig 104.
  • the coiling press jig 102 is formed in the shape of a column having the larger diameter than the diameter of the voice coil 16.
  • the outer diameter of the coiling receiver jig 104 is set to the same value as the inner diameter of the voice coil 16, and an upper end portion of the jig 104 is formed as a small-diameter recess portion 104a having the same shape as the inner surface and the lower end surface of the flange portion 16a1.
  • the coil wire C is moved up and down in the predetermined range, whereby the coil wire C is wound on the outer surface of the coiling receiver jig 104 thereby to form the voice coil 16 having the coiling section of the L-shape in which the flange portion 16a1 is formed at the upper end portion 16a.
  • the coil wire C As the coil wire C, a wire coated with fusion-bonding synthetic resin is used. And, immediately before the coiling, hot wind is blown against the wire C in order to melt the coating, whereby the wound wire C is fusion-bonded mutually to form the voice coil 16. Further, the coiling number of the coil wire C is set to an even number (for example, the coiling number at the upper end portion 16a is twelve and the coiling number at other portions is four), so that both leading and trailing ends of the wire are drawn out from the upper end portion 16a of the voice coil 16.
  • the upper end portion 16c of the voice coil 16 is bonded and fixed to the central flat portion 12b of the diaphragm 12. Since the voice coil 16 has the coiling section of the L-shape in which the flange portion 16a1 is formed at the upper end portion 16a, by only increasing slightly the weight of the usual voice coil having the I-shaped coiling section, the large bonding area can obtained between the upper end portion 16a and the diaphragm 12.
  • the coiling thickness of the voice coil having the I-shaped coiling section is only made large in whole, it is possible to prevent the large load caused by the increase of the weight of the voice coil from acting onto the bonding surface, and the sufficient fixing strength of the voice coil 16 in relation to the diaphragm 12 can be obtained.
  • the separation of the voice coil 16 can be prevented without worsening the properties of the speaker.
  • the speaker 10 is used under environment where large vibration and shock load act, for example, even in case that the speaker 10 is used as a speaker mounted on an automobile, it can be sufficiently fit for use.
  • the flange portion 16a1 is formed at the upper end portion 16a of the voice coil 16 so as to protrude inward in the radial direction, when the coiling operation of the voice coil is performed, the predetermined small-diameter recess portion 104a is previously formed at the upper end portion of the coiling receiver jig 104, whereby the voice coil 16 having the L-shaped coiling sectional shape can be readily formed.
  • the sectional shape of the flange portion 16a1 is set to a rectangular shape.
  • the flange portion may have other sectional shapes than this shape, needles to say.
  • a flange portion 16a1 can be adopted, which has a wedge-shaped section in which the vertical width becomes gradually narrower inward in the radial direction.
  • this sectional shape the increase of the weight of the voice coil 16 is kept to a minimum. Further, the large bonding area can be obtained between its upper end portion 16a and the diaphragm 12 and rigidity of the voice coil 16 itself can be heightened.
  • flange portion 16a1 protruding inward in the radial direction may be formed at the upper end portion 16a of the voice coil 16, whereby the large bonding area can be obtained between its upper end portion 16a and the diaphragm 12.
  • Fig. 5 is a side sectional view of a speaker 100 according to a first embodiment of the invention, in which the speaker faces upward
  • Fig. 6 is a detailed diagram of a 11 portion in Fig. 5 .
  • the speaker 100 is a dynamic speaker comprising a diaphragm 12, a frame 14, a voice coil 16 and a magnetic circuit unit 18. Structures and functions of the diaphragm 12, the frame 14, the voice coil 16 and the magnetic circuit unit 18 are the same as those of the speaker 10 described in the comparative example.
  • the voice coil 16 is fixed to the diaphragm 12 through a coil supporting member 26.
  • a flange portion 16a1 protruding inward in the radial direction is formed at the upper end portion 16a of the voice coil 16.
  • an engaging portion 26a is formed at a lower end portion of the coil supporting member 26, which engages with the flange portion 16a1 of the voice coil 16.
  • a caulk-fixed portion 26b is formed at an upper end portion of the coil supporting member 26, which is caulked to be fixed to the central flat portion 12b of the diaphragm 12.
  • the flange portion 16a1 of the voice coil 16 is interposed between the engaging portion 26a of the coil supporting member 26 and the central flat portion 12b of the diaphragm 12 and held by them from upper and lower sides, whereby the voice coil 16 is fixed to the diaphragm 12.
  • the diaphragm 12, the voice coil 16, and the coil supporting member 26 move up and down, when the speaker is driven, in a range shown by a two-dots chain line in Fig. 6 .
  • the height of the coil supporting member 26 is so set that clearance is provided in some degree between the coil supporting member 26 and the upper end surface 22a of the yoke 22 even when the vibration occurs with the maximum amplitude. And, by thus setting the height of this coil supporting member 26, the usual speaker driving is performed without hindrance. Further, when the vibration occurs with abnormally large amplitude over the maximum amplitude, the coil supporting member 26 comes into contact with the upper end surface 22a of the yoke 22 to restrict the vibration, whereby it is prevented that the diaphragm 12 or the like breaks.
  • Fig. 7 is a perspective view showing a state before the coil supporting member 26 is caulked and fixed to the diaphragm 12.
  • the coil supporting member 26 includes an annular member made of synthetic resin, and functions as a bobbin. At a peripheral surface of the supporting member 26, a different-in-level portion is so formed that a lower half has a large diameter, and its lower half constitutes the engaging portion 26a. Further, column-shaped caulking projections 26b' are formed at twelve points on the upper end surface of this coil supporting member 26 at an interval of 30° in the circumferential direction.
  • each of these through-holes 12c is a circular hole having the substantially same diameter as that of the caulking projection 26b'.
  • each caulking projection 26b' of the coil supporting member 26 is inserted from the lower side into each through-hole 12c of the diaphragm 12, the coil supporting member 26 is caulked and fixed to the diaphragm 12 by subjecting each caulking projection 26b' to a plastic deformation.
  • the plastic deformation of each caulking projection 26b' is performed by applying ultrasonic vibration to the caulking projection 26b' and subjecting the caulking projection 26b' to a heat-deformation.
  • a horn 204 of an ultrasonic vibration device is brought into contact with the upper end portion of the caulking projection 26b' to apply the ultrasonic vibration to the caulking projection 26b', whereby the caulking projection 26b' is subjected to the heat deformation, so that a caulk-fixed portion 26b is formed.
  • the thus formed caulk-fixed portion 26b holds the diaphragm 12 between the caulk-fixed portion 26b and the body portion of the coil supporting member 26 at the surrounding portion of the through-hole 12c, whereby the coil supporting member 26 is firmly fixed to the diaphragm 12.
  • the voice coil 16 is formed by coiling a coil wire C around the coil supporting member 26 fixed to the diaphragm 12.
  • the coil supporting member 26 fixed to the diaphragm 12 is set to a coiling receiver jig 106 having the same outer diameter as that of its engaging portion 26a. Thereafter, the coil supporting member 26 and the central flat portion 12b of the diaphragm 12 are pressed from the upper side by a coiling press jig 208. In this state, a leading end portion of the coil wire C is hung on a small-diameter recess portion adjacent above the engaging portion 26a of the coil supporting member 26, and the coiling receiver jig 106 and the coiling press jig 208 are rotated abount the central axis Ax (refer to Fig.
  • the coil wire C is moved up and down in the predetermined range, whereby the coil wire C is wound on the outer surfaces of the coil supporting member 26 and the coiling receiver jig 106 thereby to form the voice coil 16 having the coiling section of the L-shape in which the flange portion 16a1 is formed at the upper end portion 16a.
  • the coil wire C As the coil wire C, a wire coated with fusion-bonding synthetic resin is used. And, immediately before the coiling, hot wind is blown against the wire C in order to melt the coating, whereby the wound wire C is fusion-bonded mutually to form the voice coil 16. Further, the coiling number of the coil wire C is set to an even number (for example, the coiling number at the upper end portion 16a is eight and the coiling number at other portions is four), so that both leading and trailing ends of the wire are drawn out from the upper end portion 16a of the voice coil 16.
  • the speaker 100 has the coil supporting member 26 caulked and fixed to the diaphragm 12, and the engaging portion 26a of the coil supporting member 26 and the central flat portion 12b of the diaphragm 12 holds the flange portion 16a1 formed at the upper end portion 16a of the voice coil 16 between them, whereby the voice coil 16 is fixed to the diaphragm 12. Therefore, the following effects can be obtained.
  • the voice coil 16 is fixed to the diaphragm 12 physically by engaging with the voice coil to the coil supporting member 26. Therefore, its fixing strength can be improved greatly in comparison with the case where the upper end portion 16a of the voice coil 16 is fixed directly to the diaphragm 12 by bonding like the conventional art.
  • the coiling thickness at the upper end portion 16a of the voice coil 16 is large because the flange portion 16a1 is formed there, since other portions than the upper end portion 16a have the usual coiling thickness, it is not necessary to expand the width of the cylindrical magnetic gap G in the magnetic circuit unit 18, whereby without lowering electroacoustic conversion efficiency of the speaker 100, the effects can be obtained.
  • the coil supporting member 26 since its caulking projection 26b' is subjected to the plastic deformation thereby to provide the caulk-fixed portion 26b, is caulked and fixed to the diaphragm 12. Therefore, the diaphragm 12 itself does not receive the excessive load at the caulk-fixing time. Accordingly, by providing the coil supporting member 26, it is possible to prevent deformation injurious to the acoustic property from occurring in the diaphragm 12.
  • the separation of the voice coil can be prevented without worsening the acoustic property of the speaker.
  • the speaker 100 according to the first embodiment is used under environment where considerable vibration and shock load act, for example, even in case that the speaker 100 is used as a speaker mounted on an automobile, it can be sufficiently fit for use.
  • the upper end portion 16a of the voice coil 16 is not directly fixed to the diaphragm 12 by bonding. Therefore, the bonding step or the like conventionally required when the voice coil 16 is fixed to the diaphragm 12 is not necessary, so that the working efficiency in manufacture of the speaker 100 can be heightened greatly.
  • the coil supporting member 26 functions also as the amplitude limiting means. Therefore, it is possible to prevent the diaphragm 12 or the like from breaking due to occurrence of the vibration with the abnormal amplitude.
  • the coil supporting member 26 includes the annular member and the caulking projections 26b' are formed at the plural places in its circumferential direction, while the plural through-holes 12c into which these caulking projections 26b' are inserted are formed in the diaphragm 12. Therefore, caulk-fixing can be performed in a state where the coil supporting member 26 is exactly positioned in the predetermined position of the diaphragm 12. Particularly, in this first embodiment, since the twelve caulking projections 26b' and the twelve through-holes 12c are formed at the interval of 30°, the fixing strength between the coil supporting member 26 and the diaphragm 12 can be made extremely high.
  • each caulking projection 26b' is performed by applying the ultrasonic vibration to the caulking projection 26' thereby to subject the caulking projection to the heat deformation. Therefore, though each caulking projection 26' is a very small projection, the caulk-fixing can be readily and reliably performed. In this case, since the diaphragm 12 itself is not subject to caulk-fixing, it is not necessary to select the material to be suitable for fusion-bonding. Accordingly, there is no restriction on selection freedom of material of the diaphragm 12.
  • Figs. 9A and 9B are diagrams similar to Figs. 8A and 8B , which show a first modification of the first embodiment.
  • the first modification it is similar to the second embodiment that a voice coil 16 is fixed to a diaphragm 12 through a coil supporting member 26.
  • the first modification is different from the first embodiment in a manufacturing method for realizing this fixing.
  • the voice coil 16 is previously formed and the coil supporting member 26 is set to a caulking receiver jig 202 together with this voice coil 16. Thereafter, the diaphragm 12 is set to the coil supporting member 26 in such a manner that each caulking projection 26b' is inserted into each through-hole 12c. Under this state, as shown in Fig. 9B , a horn 204 of an ultrasonic vibration device is brought into contact with the upper end portion of the caulking projection 26b' to apply the ultrasonic vibration to the caulking projection 26', whereby the caulking projection 26b' is subjected to a heat deformation, so that a caulk-fixed portion 26b is formed.
  • Fig. 10 is a main portion side sectional view, which shows a second modification of the first embodiment; and Fig. 11 is a perspective view of the second modification, which shows a state before a coil supporting member 26 is caulked and fixed to a diaphragm 12.
  • the second modification is different from the first embodiment in the caulk-fixing structure of the coil supporting member 26 to the diaphragm 12.
  • an annular rib-shaped caulking projection 26c' is formed at the upper end surface of the coil supporting member 26.
  • an inward part of its central flat portion 12b in the radial direction is punched out, and a circular through-hole 12d of such a size that it substantially comes into contact with the periphery outside of the caulking projection 26c' is formed.
  • the caulking projection 26c' is inserted into the through-hole 12d of the diaphragm 12 from the lower side, the caulking projection 26c' is subjected to a plastic deformation toward the peripheral side in whole to form a caulk-fixed portion 26c, whereby the coil supporting member 26 is fixed to the diaphragm 12.
  • the plastic deformation of the caulking projection 26c' is performed by applying ultrasonic vibration to the caulking projection 26c' and subjecting the caulking projection 26c' to a heat-deformation.
  • the coil supporting member 26 in the second modification is not an annular member but a lid member that covers the whole of the through-hole 12d.
  • the upper and lower spaces of the diaphragm 12 are completely partitioned, and acoustic property of a speaker 100 is maintained.
  • the diaphragm 12 can be readily set to the coil supporting member 26, whereby working efficiency in manufacture of the speaker 100 can be heightened more.
  • Figs. 12A and 12B are diagrams similar to Fig. 6 , which show a third modification and a fourth modification of the first embodiment.
  • a projection 26d is formed, which has a little smaller diameter than the diameter of a through-hole 12c of the diaphragm 12.
  • the projection 26d is inserted into the through-hole 12c from the lower side.
  • adhesive A is applied to the surroundings of the projection 26d, whereby the coil supporting member 26 is bonded and fixed to a central flat portion 12b of the diaphragm 12.
  • the fixing strength of the voice coil 16 to the diaphragm 12 can be greatly improved.
  • the sectional shape of each of the engaging portion 26a of the coil supporting member 26 and the flange portion 16a1 of the voice coil 16 is set to a rectangular shape.
  • the engaging portion 26a and the flange portion 16a1 may have other sectional shape than this shape.
  • both sectional shapes it is possible to set the both sectional shapes to a trapezoid or a triangle, or it is possible to set one sectional shape to a fan-shape and to set the other sectional shape to a shape having an arc-shaped recess portion that fits to the fan-shape.
  • the coil supporting member 26 includes the member made of synthetic resin.
  • the coil supporting member 26 may be made of other material than the synthetic resin, for example, of aluminum as long as the caulking projections 26b' and 26c' can be.subjected to the plastic deformation. Further, in case of using aluminum or the like, the ultrasonic vibration cannot be used. However, each of the caulking projections 26b' and 26C' can be mechanically subjected to the plastic deformation.
  • the coil supporting member 26 may be formed not as an annular member having the plural caulking projections 26b' are formed but as a small piece having a single caulking projection 26b' is formed. In this case, each of these plural coil supporting members 26 can be caulk-fixed to each of plural through-holes 12 formed at a central flat portion 12b of the diaphragm 12.
  • the speaker 100 is a small-sized speaker
  • the similar effects to those in the first embodiment and each modification can be obtained.

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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)
  • Diaphragms For Electromechanical Transducers (AREA)

Claims (6)

  1. Lautsprecher, enthaltend:
    eine Membran (12);
    eine Magnetkreiseinheit (18), die einen zylindrischen Magnetspalt definiert; und
    eine Schwingspule (16), die einen ersten Abschnitt (16a), der an der Membran befestigt ist, und einen zweiten Abschnitt (16b) hat, der sich im zylindrischen Magnetspalt befindet, wobei der erste Abschnitt (16a) der Schwingspule einen Flanschabschnitt (16a1) hat, der in radialer Richtung der Membran derart nach innen hervorragt, dass die Schwingspule im wesentlichen L-förmig ist, wobei die Dicke des ersten Abschnittes (16a) der Schwingspule größer ausgebildet ist als jene des zweiten Abschnittes (16b) der Schwingspule, und wobei ein Spulenhalteelement (26), das den ersten Endabschnitt (16a) der Schwingspule hält, an der Membran (12) befestigt ist; dadurch gekennzeichnet, dass das Spulenhalteelement mit der Membran verstemmt ist, indem ein Stemmvorsprung (26b), der im Spulenhalteelement ausgebildet ist, plastisch verformt ist, und dadurch, dass ein Eingriffsabschnitt (26a), der mit dem Flanschabschnitt in Eingriff gelangt, im Spulenhalteelement ausgebildet ist.
  2. Lautsprecher nach Anspruch 1, weiterhin enthaltend:
    einen Rahmen (14) mit einer Unterseite;
    wobei die Magnetkreiseinheit (18) einen Magneten (20), der an der Unterseite des Rahmens angebracht ist, und ein Joch (22) enthält, das auf dem Magneten angeordnet ist, wobei der zylindrische Magnetspalt zwischen der Seitenfläche des Joches (22) und dem Rahmen (14) definiert ist;
    die Membran (12) über dem Joch angeordnet ist; und der erste Abschnitt (16a) der Schwingspule mit der Membran verklebt ist.
  3. Lautsprecher nach Anspruch 2, bei dem der Rahmen (14) eine im wesentlichen kreisförmige Gestalt hat und sich die Unterseite im Zentrum der Kreisform befindet.
  4. Lautsprecher nach einem der Ansprüche 1 bis 3, bei dem der erste Abschnitt (16a) der Schwingspule eine abgeschrägte Seitenfläche hat.
  5. Lautsprecher nach einem der vorhergehenden Ansprüche, bei dem das Spulenhalteelement (26) aus Kunstharz besteht; und
    die plastische Verformung dadurch erfolgt, dass eine Ultraschallschwingung auf den Stemmvorsprung angewendet wird und der Stemmvorsprung einer Wärmeverformung unterzogen wird.
  6. Lautsprecher nach einem der vorhergehenden Ansprüche, bei dem das Spulenhalteelement (26) ein ringförmiges Element ist;
    wobei der Stemmvorsprung eine Vielzahl von Stemmvorsprüngen enthält, die an unterschiedlichen Positionen im Spulenhalteelement in einem vorbestimmten Intervall in der Umfangsrichtung ausgebildet sind; und
    eine Vielzahl von Durchgangslöchern in der Membran ausgebildet ist, in die die Vielzahl der Stemmvorsprünge eingefügt ist.
EP20010301583 2000-02-25 2001-02-22 Lautsprecher Expired - Lifetime EP1128705B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2000050197 2000-02-25
JP2000050197A JP4261721B2 (ja) 2000-02-25 2000-02-25 スピーカ
JP2000050198 2000-02-25
JP2000050198A JP3619736B2 (ja) 2000-02-25 2000-02-25 スピーカ

Publications (3)

Publication Number Publication Date
EP1128705A2 EP1128705A2 (de) 2001-08-29
EP1128705A3 EP1128705A3 (de) 2003-01-02
EP1128705B1 true EP1128705B1 (de) 2009-05-06

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EP20010301583 Expired - Lifetime EP1128705B1 (de) 2000-02-25 2001-02-22 Lautsprecher

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DE (1) DE60138583D1 (de)

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CN1585565B (zh) * 2003-08-19 2011-02-09 松下电器产业株式会社 扬声器

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EP2007169A3 (de) * 2007-06-20 2009-12-09 Sonion Horsens A/S Miniatursprachspule mit integrierter Kopplungsspule
KR101483089B1 (ko) * 2013-04-24 2015-01-19 주식회사 이엠텍 음향변환장치의 서스펜션
US9154864B1 (en) * 2014-04-30 2015-10-06 Harman International Industries, Inc. Speaker assembly
CN107172547B (zh) * 2017-05-26 2020-05-08 歌尔股份有限公司 音圈绕制方法及振动组件及设有该振动组件的发声器
US10911875B2 (en) * 2018-08-30 2021-02-02 Apple Inc. Electro-acoustic transducer diaphragm with integrated structural features, and related systems and methods
CN110830890B (zh) * 2019-11-11 2021-12-28 歌尔股份有限公司 音圈组件及扬声器

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US1962012A (en) * 1932-04-09 1934-06-05 Grassmann Peter Electrodynamic loud speaker
JPS5389728A (en) * 1977-01-19 1978-08-07 Sansui Electric Co Loudspeaker unit
JPS567594A (en) * 1979-06-30 1981-01-26 Pioneer Electronic Corp Voice coil for flat diaphragm type speaker
JPS56126399A (en) * 1980-03-10 1981-10-03 Mitsubishi Electric Corp Attaching structure of voice coil for flat plate type speaker
JPS57148498A (en) * 1981-03-09 1982-09-13 Seiko Instr & Electronics Ltd Dynamic speaker
JPH01215200A (ja) * 1988-02-23 1989-08-29 Mitsubishi Electric Corp スピーカー
ATE205040T1 (de) * 1994-06-01 2001-09-15 Harman Audio Electronic Sys Lautsprecher

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1585565B (zh) * 2003-08-19 2011-02-09 松下电器产业株式会社 扬声器

Also Published As

Publication number Publication date
EP1128705A2 (de) 2001-08-29
CN1199519C (zh) 2005-04-27
EP1128705A3 (de) 2003-01-02
DE60138583D1 (de) 2009-06-18
CN1310576A (zh) 2001-08-29

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