EP0926924B1 - Haut-parleur - Google Patents

Haut-parleur Download PDF

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Publication number
EP0926924B1
EP0926924B1 EP98401003A EP98401003A EP0926924B1 EP 0926924 B1 EP0926924 B1 EP 0926924B1 EP 98401003 A EP98401003 A EP 98401003A EP 98401003 A EP98401003 A EP 98401003A EP 0926924 B1 EP0926924 B1 EP 0926924B1
Authority
EP
European Patent Office
Prior art keywords
section
speaker
vibrating
base section
vibrating section
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
EP98401003A
Other languages
German (de)
English (en)
Other versions
EP0926924A2 (fr
EP0926924A3 (fr
Inventor
Takeshi Nakamura
Takayuki Kaneko
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.)
Murata Manufacturing Co Ltd
Original Assignee
Murata Manufacturing 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
Application filed by Murata Manufacturing Co Ltd filed Critical Murata Manufacturing Co Ltd
Publication of EP0926924A2 publication Critical patent/EP0926924A2/fr
Publication of EP0926924A3 publication Critical patent/EP0926924A3/fr
Application granted granted Critical
Publication of EP0926924B1 publication Critical patent/EP0926924B1/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/127—Non-planar diaphragms or cones dome-shaped
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R17/00—Piezoelectric transducers; Electrostrictive transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2307/00—Details of diaphragms or cones for electromechanical transducers, their suspension or their manufacture covered by H04R7/00 or H04R31/003, not provided for in any of its subgroups
    • H04R2307/023—Diaphragms comprising ceramic-like materials, e.g. pure ceramic, glass, boride, nitride, carbide, mica and carbon materials

Definitions

  • the present invention relates to a speaker including a substantially semi-spherical piezoelectric ceramic member and more particularly to a speaker which is constructed for use, for example, as a super-tweeter used in reproducing DVD audio or super-audio CDs.
  • a piezoelectric ceramic speaker initially envisaged by the present Applicant has a vibrating section made of a semi-spherical piezoelectric body and is constructed by connecting the vibrating section and a base section which sections are separately formed of different materials.
  • the vibrating section is mounted on the base section with insulation materials located therebetween.
  • this related speaker is constructed by using an adhesive to connect the vibrating section and the base section which are separately formed of different materials, the manufacturing efficiency and the acoustic characteristics of the sound output thereby are not uniform or of high quality as is desired. Furthermore, a high harmonic mode of the semi-spherical piezoelectric body is generated as spurious in about half of a fundamental resonance frequency by profile vibration of the semi-spherical end surface.
  • the base section is required to have insulation material for accommodating connecting terminals, the base section often requires an increased thickness because the specific weight of the base section usually made of synthetic resin is too light which causes a draw or concave recess during molding of the base section.
  • the Applicant's earlier European patent application EP 782,370 relates to a speaker using a semi-spherical vibrating section made of piezoelectric material and having driving electrodes on its inner and outer surfaces.
  • US 4,550,797 describes a speaker diaphragm made from a moulded sintered ceramic body.
  • This diaphragm is dome shaped or cone-shaped and has a small integral flange at the periphery thereof in order to prevent deformation during a firing process that forms part of the manufacturing method of the diaphragm.
  • US 4,284,921 describes a speaker using a cone-shaped or dome-shaped vibrating section made of piezoelectric material and having driving electrodes on its inner and outer surfaces.
  • This vibrating section has a small integral flange at its periphery.
  • the preferred embodiments of the present invention provide a speaker which is adapted and constructed to allow increased efficiency of manufacturing and substantially uniform and excellent acoustic characteristics of sound output thereby.
  • a speaker includes a semi-spherical vibrating section, driving electrodes for vibrating the vibrating section, and a base section for holding the vibrating section, wherein the vibrating section and the base section comprise a unitary, integral molded piezoelectric body and the vibrating section and base section have a weight ratio relative to each other in the range from 1:5 to 1:20.
  • the vibrating section vibrates due to a piezoelectric effect and emits sound waves from the curved semi-spherical surfaces of the vibrating body in the inventive speaker according to the preferred embodiments of the present invention. Because of the semi-spherical shape of the vibrating body, sound waves are transmitted omnidirectionally and are not limited to only certain directional sound wave transmission as is common in prior art speakers.
  • the vibrating section and the base section are molded as a single unitary body of piezoelectric material, a step and material required for bonding the vibrating section and the base section to each other required in related speakers is eliminated. Thus, the number of parts and manufacturing and assembly steps are reduced and ease and efficiency of fabrication is increased. Further, with the novel structure of the preferred embodiments of the present invention, profile vibration in the high order mode is suppressed because of the unitary construction of the vibrating section and the base section, thereby improving the acoustic characteristics of the speaker.
  • the vibrating section and the base section are molded and formed such that a ratio of weight relative to each other is 1:5 to 1:20 for the purpose of improving the acoustic characteristics of the speaker. More specifically, the inventor of the present application determined that acoustic characteristics of the inventive speaker are greatly improved when an outline vibration mode of the semi-spherical surfaces of the vibrating body is suppressed as much as possible. The inventor also determined that the outer edges of the curved semi-spherical surfaces of the vibrating body should be fixed to suppress the outline vibration mode of the vibrating body.
  • the inventor discovered that when the outer edges of the curved semi-spherical surfaces of the speaker body are fixed to a support member such as a speaker box, for example, and the base section of the speaker vibrates, the acoustic characteristics of the speaker are changed.
  • This problem of changing speaker acoustic characteristics is solved and uniform high quality acoustic characteristics are achieved by molding the vibrating section and the base section such that a ratio of weight relative to each other is in the range from 1:5 to 1:20.
  • the driving electrodes are disposed on a surface of the vibrating section and to have a portion of the driving electrodes extend onto the base section. As a result of this arrangement of the driving electrodes, it is easier to connect the electrodes with external circuits by extending the driving electrodes located on the surface of the vibrating section onto the base section.
  • mounting notches or holes in the base section to allow the speaker to be attached to a support member such as a case or box.
  • FIG. 1 is a perspective view showing one example of a preferred embodiment of a speaker according to the present invention.
  • FIG. 2 is a section view along line II-II in Fig. 1 .
  • Fig. 1 is a perspective view of a speaker according to a preferred embodiment of the present invention and also shown in Fig. 2 which is a section view along line II-II in Fig. 1 .
  • a speaker 10 shown in Fig. 1 includes a semi-spherical vibrating section 12.
  • the vibrating section 12 is polarized in the direction of its thickness, for example.
  • a ringed plate-like base section 14 is formed at the edge portion of the vibrating section 12 in a single, unitary body construction.
  • the vibrating section 12 and the base section 14 are preferably formed so that the ratio of their respective weights relative to each other is about 1:5 to about 1:20.
  • the vibrating section 12 is preferably formed to have a size of about 20 mm in diameter and about 0.5 mm in thickness and the base section 14 is preferably formed to have a size of about 60 mm in diameter and about 5 mm in thickness.
  • Mounting notches or recesses 16 are preferably created in the circumferential direction of the outer edge portion of the base section 14, for example, at a plurality of locations at predetermined intervals at the same time when the base section 14 is molded.
  • the mounting notches 16 make it easy to fix the base section 14 to a separate support member such a case or support stand.
  • the speaker can be fixed to such support member by fixing members such as screws (not shown).
  • the shape and location and number of the mounting notches 16 is not limited to that shown in Fig. 1 . For example, it is possible to create through holes of any shape in the base section 14 for functioning as mounting holes 16.
  • the vibrating section 12 and the base section 14 are press-molded or injection-molded using a piezoelectric body such as ceramic and by sintering thereafter.
  • the notches 16 can be formed.
  • the electrodes can be added as described below.
  • a driving electrode 18 for vibrating the vibrating section 12 is disposed on the curved outer surface of the semi-spherical vibrating section 12 and a driving electrode 20 is disposed on the inner surface of the semi-spherical vibrating section 12. That is, the driving electrode 18 and the driving electrode 20 are arranged so as to face each other with the vibration section 12 being located therebetween in a thickness direction thereof. Further, one end of a strip lead electrode 22 is connected to the driving electrode 18 and the other end thereof is extended on the surface of the base section 14. Similarly, one end of a strip lead electrode 24 is connected to the driving electrode 20 and the other end thereof is extended onto the back of the base section 14.
  • the driving electrodes 18 and 20 and the lead electrodes 22 and 24 of the present preferred embodiment preferably have a double-layer structure, respectively.
  • a Ni layer is preferably formed as the underlying layer and an Au layer is preferably laminated on the Ni layer as a finishing layer.
  • the driving electrodes 18 and 20 and the lead electrodes 22 and 24 are preferably formed by plating, sputtering, evaporation or printing after masking a portion where no electrode is to be formed.
  • the speaker 10 also includes connecting terminals 26 and 28 each preferably comprising a metallic pin.
  • the connecting terminals 26 and 28 are attached respectively so as to penetrate through the base section 14 in the thickness direction thereof. Then, the connecting terminal 26 is electrically connected and fixed to the lead electrode 22 and the connecting terminal 28 is electrically connected and fixed to the lead electrode 24.
  • the connecting terminals 26 and 28 are connected with the lead electrodes 22 and 24 by soldering, for example, or other connection devices or techniques.
  • the vibrating section 12 and the base section 14 comprise a single unitary molded piezoelectric body, there is no step or material required for bonding the vibrating section 12 the base section 14. Thus, this reduces the parts and steps required for manufacturing the speaker and increases the quality of the acoustic characteristics of the speaker. In addition, forming the vibrating section 12 and the base section 14 to have a ratio of weight of about 1:5 to about 1:20, the acoustic characteristics of the speaker are further improved. In addition, due to the single molded unitary piezoelectric body including the vibrating section 12 and base section 14, the profile vibration in the high order mode is suppressed.
  • the fabrication of the speaker is further facilitated because the construction of the preferred embodiments of the present invention allow the driving electrodes 18 and 20 and the lead electrodes 22 and 24 to be formed at the same time via a plating step or similar process. Because the lead electrodes 22 and 24 are extended onto the base section 14, the vibration is not suppressed as often occurs in the prior art in which lead wires are connected directly to the vibrating section 12. Because the lead electrodes 22 and 24 and the connecting terminals 26 and 28 are formed in the speaker 10, it is easy to connect the electrodes 22, 24, 26 and 28 to external circuits (not shown). In addition, because mounting notches 16 are formed in the base section 14 in the speaker 10, the speaker 10 is easily attached to a support member.
  • the vibrating section and the base section are molded into a single unitary body of piezoelectric material so that it is not required to connect the vibrating section and the base section as is required with other speakers.
  • the number of parts and steps required to assemble the speaker is reduced and the costs of manufacturing are significantly reduced.
  • the profile vibration in the high order mode is significantly reduced and the acoustic characteristics of the speaker are greatly improved.

Claims (8)

  1. Haut-parleur (10), comprenant :
    une section vibrante sensiblement semi-sphérique (12) ;
    une pluralité d'électrodes de commande (18, 20) pour faire vibrer ladite section vibrante (12) ; et
    une section de base (14) pour supporter ladite section vibrante (12) ; dans lequel
    ladite section vibrante (12) et ladite section de base (14) comprennent un unique corps piézoélectrique moulé unitaire ;
    caractérisé en ce que ladite section vibrante (12) et ladite section de base (14) ont un rapport pondéral l'une par rapport à l'autre dans la gamme de 1/5 à 1/20.
  2. Haut-parleur (10) selon la revendication 1, dans lequel ladite pluralité d'électrodes de commande (18, 20) sont situées sur la surface de ladite section vibrante (12) et une partie (22, 24) desdites électrodes de commande (18, 20) s'étend sur ladite section de base (14).
  3. Haut-parleur (10) selon la revendication 1 ou 2, dans lequel une pluralité d'encoches de montage (16) sont fournies dans ladite section de base (14) pour permettre audit haut-parleur (10) d'être supporté sur un élément de support.
  4. Haut-parleur (10) selon l'une quelconque des revendications précédentes, dans lequel ladite section vibrante (12) est polarisée dans une direction d'épaisseur de celle-ci.
  5. Procédé de fabrication d'un laut-parleur (10) comprenant les étapes consistant à :
    fournir un moule pour former un corps unitaire simple comprenant une section vibrante (12) et une section de base (14) ;
    insérer un matériau piézoélectrique dans ledit moule pour former un corps simple unitaire moulé comprenant la section vibrante (12) et la section de base (14) ; et
    fritter le corps unitaire moulé comprenant la section vibrante (12) et la section de base (14) ;
    caractérisé en ce que ladite section vibrante (12) et ladite section de base (14) ont un rapport pondéral l'une par rapport à l'autre dans la gamme de 1/5 à 1/20.
  6. Procédé selon la revendication 5, comprenant en outre l'étape consistant à fournir une pluralité d'électrodes de commande (18, 20) sur la surface de ladite section vibrante (12) de sorte qu'une partie (22, 24) desdites électrodes de commande (18, 20) s'étende sur ladite section de base (14).
  7. Procédé selon la revendication 5 ou 6, dans lequel une pluralité d'encoches de montage (16) sont fournies dans ladite section de base (14) pour permettre audit haut-parleur (10) d'être supporté sur un élément de support.
  8. Procédé selon l'une quelconque des revendications 5 à 7, dans lequel ladite section vibrante (12) est polarisée dans une direction d'épaisseur de celle-ci.
EP98401003A 1997-12-27 1998-04-24 Haut-parleur Expired - Lifetime EP0926924B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP09368133A JP3134835B2 (ja) 1997-12-27 1997-12-27 スピーカ
JP36813397 1997-12-27

Publications (3)

Publication Number Publication Date
EP0926924A2 EP0926924A2 (fr) 1999-06-30
EP0926924A3 EP0926924A3 (fr) 2005-04-13
EP0926924B1 true EP0926924B1 (fr) 2008-08-20

Family

ID=18491050

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98401003A Expired - Lifetime EP0926924B1 (fr) 1997-12-27 1998-04-24 Haut-parleur

Country Status (5)

Country Link
EP (1) EP0926924B1 (fr)
JP (1) JP3134835B2 (fr)
KR (1) KR100320300B1 (fr)
CN (1) CN1132499C (fr)
DE (1) DE69839907D1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100906335B1 (ko) * 2007-08-07 2009-07-06 티.비텔레콤(주) 디지털 마이크의 베이스 부재 제조 방법

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2409654B1 (fr) * 1977-11-17 1985-10-04 Thomson Csf Dispositif transducteur piezoelectrique et son procede de fabrication
FR2473242A1 (fr) * 1980-01-08 1981-07-10 Thomson Csf Transducteur electroacoustique a dome actif
US4550797A (en) * 1983-01-17 1985-11-05 Victor Company Of Japan Loudspeaker diaphragm made of a molded, sintered ceramic body
JP3180646B2 (ja) * 1995-12-14 2001-06-25 株式会社村田製作所 スピーカ
JP3186584B2 (ja) * 1996-05-31 2001-07-11 株式会社村田製作所 スピーカ

Also Published As

Publication number Publication date
KR19990062395A (ko) 1999-07-26
JPH11196490A (ja) 1999-07-21
JP3134835B2 (ja) 2001-02-13
EP0926924A2 (fr) 1999-06-30
EP0926924A3 (fr) 2005-04-13
CN1222048A (zh) 1999-07-07
DE69839907D1 (de) 2008-10-02
KR100320300B1 (ko) 2002-02-19
CN1132499C (zh) 2003-12-24

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