EP0642291B1 - Loudspeaker diaphragm attaching - Google Patents

Loudspeaker diaphragm attaching Download PDF

Info

Publication number
EP0642291B1
EP0642291B1 EP19940305330 EP94305330A EP0642291B1 EP 0642291 B1 EP0642291 B1 EP 0642291B1 EP 19940305330 EP19940305330 EP 19940305330 EP 94305330 A EP94305330 A EP 94305330A EP 0642291 B1 EP0642291 B1 EP 0642291B1
Authority
EP
European Patent Office
Prior art keywords
edge
spider
voice coil
loudspeaker
coil former
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
EP19940305330
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0642291A3 (en
EP0642291A2 (en
Inventor
James M. Scanlan
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.)
Bose Corp
Original Assignee
Bose Corp
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 Bose Corp filed Critical Bose Corp
Publication of EP0642291A2 publication Critical patent/EP0642291A2/en
Publication of EP0642291A3 publication Critical patent/EP0642291A3/en
Application granted granted Critical
Publication of EP0642291B1 publication Critical patent/EP0642291B1/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/16—Mounting or tensioning of diaphragms or cones

Definitions

  • the invention relates in general to loudspeaker diaphragm attaching and more particularly to an improved joint among diaphragm neck, spider and voice coil former.
  • FR-A-2 668 018 shows a loudspeaker comprising, a diaphragm having a neck with an annular edge which is formed in a mould with a voice coil former having an annular edge moulded into the annular edge of the diaphragm; and, a spider which is secured to the diaphragm adjacent the annular edge.
  • the present invention is characterised in that the annular edge of the neck and the annular edge of the voice coil former are disposed and connected together in an annular groove structure in fixed relationship to the spider.
  • a loudspeaker driver basket has the motor structure located in front of the cone with the spider behind the motor structure resiliently supporting the rear edge of the coil former.
  • the voice coil is located at the front end of the coil former.
  • the neck joint is in a groove in the spider.
  • the dual shear action of the neck joint in the novel cone/coil former/spider configuration increases the buckling load of the coil former.
  • the spider groove provides a large bond area between the cone, former and spider, thus making a stronger neck joint.
  • the groove aids in confining the bonding adhesive to a localized region which improves manufacturability by preventing the adhesive from flowing out of the desired joint.
  • This invention also helps provide consistent acoustic properties of the manufactured loudspeaker drivers embodying the invention.
  • the adhesives used to couple the dustcap to conventional loudspeakers have variations in their stiffness, mass and damping characteristics. These variations are difficult to control and therefore result in variations in the frequency response of the loudspeakers.
  • the novel cone/coil former/spider configuration eliminates the need for a dustcap and its associated adhesive joint, yet still prevents the ingress of dust into the motor structure and reduces variations in acoustic properties of manufactured drivers embodying the invention.
  • Rear basket 24 preferably made from aluminium, has a bottom edge 25 coupled to the outer edge of spider 10.
  • the spider is preferably made from a cotton-polyester blend and has a centrally disposed circular groove 11. Spider 10 extends completely over the opening in rear basket 24, thereby additionally functioning as a dust cap to help prevent debris from entering motor structure 20.
  • the central portion of spider 10, located inside groove 11, can be treated or impregnated with various stiffening agents well known in the art to achieve the traditional range of conventional dust cap properties.
  • a light treatment will allow air to pass through spider 10 and over coil former 14, cooling voice coil 15 and motor structure 20.
  • a stiffer treatment helps produce more acoustic energy at higher frequencies and prevents buckling of the membrane at high pressure loads.
  • Paper or plastic cone 12 has annular foam surround 13 disposed around its outer edge 22.
  • the inner annular edge 21 of the cone neck is bonded with the rear edge of coil former 14, preferably made from aluminium, inside groove 11 with a two-part epoxy adhesive, which is then cured at a high temperature.
  • Voice coil 15 is disposed at the front edge of coil former 14 and is preferably made from copper clad aluminium wire. Tinsel leads 16 are coupled to voice coil 15 and are brought out through slits 40 in cone 12.
  • Motor structure 20 is supported on the inside of front basket 30, which is preferably aluminium, and comprises a rearwardly opening cup-shaped yoke assembly formed with an annular recess 44 for accommodating voice coil 15.
  • a neodymium-iron-boron circular disk magnet 18 is sandwiched between yoke 19 and coin 17 coacting with yoke 19 to define an annular recess 44 and to provide a radial magnetic field between coin 17 and the cylindrical wall of yoke 19.
  • Yoke 19 and coin 17 are preferably made from low-carbon steel.
  • surround 13 is adhesively bonded between the rearward edge of the front basket and the front edge of the rear basket.
  • front basket 30 has a circular opening 32 for accommodating yoke 19.
  • Circular lip 43 of yoke 19 is bonded to the edge of circular opening 32.
  • the distance between the top 30 of front basket 30 and the bottom 24 of rear basket 24 is less than 18 cm (8 inches).
  • FIG. 5 there is shown an enlarged sectional view of neck joint 50 along section 5-5 in Fig. 2.
  • coil former 14 and cone 12 are pre-assembled with horizontal plane 53 of surround 13 perpendicular to axial plane 52 of former 14.
  • Cone 12 and the rear edge of coil former 14 are then bonded to spider 10 in groove 11 with a high-temperature, two-part epoxy 51.
  • groove 11 assists in centering and maintaining the perpendicularity of coil former 14 with respect to horizontal plane 53 of surround 13. In addition, groove 11 aids in confining bonding adhesive 51 to a localised region which improves manufacturability by preventing the adhesive from flowing out of the desired joint and into motor structure 20 or onto spider 10.
  • a particularly important advantage of groove 11 can be seen by comparing neck joint 50 with a prior art neck joint 250, as shown in Fig. 7.
  • neck joint 250 only one surface of coil former 214 contacts one surface of spider 210 and cone 212.
  • the neck joint according to the invention shown in Figs. 5 and 6 has a significantly larger bond area to form a stronger joint.
  • Another advantage of the invention resides in the dual shear action of neck joint 50 increasing the buckling load of coil former 14.
  • the coil former is displaced in the direction shown by arrow 54 in Fig. 5 and arrow 254 in Fig. 7.
  • Prior art neck joint 250 creates a non-columnar, uneven pull on coil former 214.
  • coil former 14 is always in either pure tension or pure compression, thereby extending the life of the neck joint. This feature is particularly important in woofers where the coil former excursions are quite large and create large stresses at the neck joint.
  • Fig. 6 shows an alternative embodiment of the invention.
  • spider 110 shown in Fig. 6 has a central circular opening concentric with groove 111 and having a smaller diameter than groove 111.
  • Dust cap 160 covers the circular opening as shown to prevent dust from entering the magnetic gap and allowing the differential air pressure at the yoke to equalize the pressure in front of the cone.
  • FIG. 8 dust cap 331 is formed with annular groove 312 accommodating the upper edges of cone 313 and former 314 secured therein with adhesive 317.
  • Adhesive 316 secures the inside edge of spider 315 to dust cap 331.
  • spider 325 is formed with an annular groove 322 that accommodates the upper edges of cone 323 and former 324 with spider 325 secured to the outside edge of dust cap 321.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
EP19940305330 1993-08-05 1994-07-20 Loudspeaker diaphragm attaching Expired - Lifetime EP0642291B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10237893A 1993-08-05 1993-08-05
US102378 1993-08-05

Publications (3)

Publication Number Publication Date
EP0642291A2 EP0642291A2 (en) 1995-03-08
EP0642291A3 EP0642291A3 (en) 1996-01-31
EP0642291B1 true EP0642291B1 (en) 2002-02-13

Family

ID=22289525

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940305330 Expired - Lifetime EP0642291B1 (en) 1993-08-05 1994-07-20 Loudspeaker diaphragm attaching

Country Status (3)

Country Link
EP (1) EP0642291B1 (ja)
JP (1) JP3411400B2 (ja)
DE (1) DE69429843T2 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9445201B2 (en) 2013-11-21 2016-09-13 Harman International Industries, Inc. Inverted dual coil transducer

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3783150B2 (ja) 1998-04-24 2006-06-07 株式会社オメガ 殺菌力を有する氷およびその製造方法
FR2818083B1 (fr) * 2000-12-12 2003-02-21 Francois Charlet Haut-parleur a pavillon interne
US20080027158A1 (en) * 2004-08-19 2008-01-31 Hiroyuki Ishida Speaker Diaphragm
JP4137869B2 (ja) 2004-10-25 2008-08-20 パイオニア株式会社 スピーカー装置及びその製造方法
DE102008024816B4 (de) 2008-05-23 2015-07-16 Sennheiser Electronic Gmbh & Co. Kg Dynamischer elektro-akustischer Wandler und Hörer
GB201721285D0 (en) * 2017-12-19 2018-01-31 Pss Belgium Nv Loudspeaker

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5389728A (en) * 1977-01-19 1978-08-07 Sansui Electric Co Loudspeaker unit
NL7908896A (nl) * 1979-12-11 1981-07-01 Philips Nv Een mechanisch filter voor een elektrodynamische omzetter.
US4737992A (en) * 1985-11-15 1988-04-12 Bose Corporation Compact electroacoustical transducer with spider covering rear basket opening
DE3641760A1 (de) * 1986-12-06 1988-06-16 Electronic Werke Deutschland Lautsprecher
US5008945A (en) * 1988-05-23 1991-04-16 Pioneer Electronic Corp. Water-proof speaker unit
JPH04111597A (ja) * 1990-08-30 1992-04-13 Sharp Corp 動電型スピーカ
FR2668018A1 (fr) * 1990-10-12 1992-04-17 Cabasse Kergonan Sa Procede de fabrication de l'equipage mobile d'un haut-parleur electrodynamique, et equipage mobile correspondant.

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9445201B2 (en) 2013-11-21 2016-09-13 Harman International Industries, Inc. Inverted dual coil transducer

Also Published As

Publication number Publication date
EP0642291A3 (en) 1996-01-31
JPH07154895A (ja) 1995-06-16
EP0642291A2 (en) 1995-03-08
DE69429843D1 (de) 2002-03-21
JP3411400B2 (ja) 2003-05-26
DE69429843T2 (de) 2002-08-08

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