EP0642291B1 - Lautsprechermembranbefestigung - Google Patents
Lautsprechermembranbefestigung Download PDFInfo
- 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
Links
Images
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)
Claims (7)
- Lautsprecher, umfassend:eine Membran (12), die einen Hals mit einer ringförmigen Kante aufweist;einen Schwingspulenkörper (14), der eine ringförmige Kante aufweist; undeine Spinne (10)
die ringförmige Kante (21) des Halses und die ringförmige Kante des Schwingspulenkörpers (14) in einer ringförmigen Rillenstruktur (11) in festem Bezug zur Spinne angeordnet und miteinander verbunden sind. - Lautsprecher nach Anspruch 1, bei dem die ringförmige Rillenstruktur (11) integral mit der Spinne (10) ist.
- Lautsprecher nach Anspruch 1, bei dem die ringförmige Rillenstruktur (11) eine Staubkappe (160) über dem Schwingspulenkörper (114) umfaßt.
- Lautsprecher nach Anspruch 1, der ferner folgendes umfaßt:einen vorderen Korb (30), der eine rückwärtige Kante aufweist, die eine Öffnung (32) umgibt, und der einen inneren Bereich aufweist;eine Erregeranordnung (20), die zentral an den inneren Bereich des vorderen Korbes gekoppelt ist, mit einer inneren und einer äußeren Wand, und die einen Magneten (18) zum Liefern eines Magnetfeldes zwischen der inneren und der äußeren Wand aufweist;einen rückwärtigen Korb (24), der einen Boden mit einer Bodenkante (25), die eine Bodenöffnung umgibt, und eine Vorderkante, die eine Öffnung umgibt, aufweist;wobei der Schwingspulenkörper (14) eine vordere und eine rückwärtige Kante und einen zentralen Innenraum aufweist, wobei der Schwingspulenkörper derart aufgebaut ist, daß er zwischen die innere und die äußere Wand der Erregeranordnung (20) paßt;eine Schwingspule (15), die um die vordere ringförmige Kante des Schwingspulenkörpers (14) gekoppelt ist;wobei die Membran (12) eine äußere ringförmige Kante aufweist, die zwischen die rückwärtige Kante des vorderen Korbes (30) und die vordere Kante des rückwärtigen Korbes (24) gekoppelt ist;wobei die Spinne (10) eine äußere Kante aufweist, die an die untere Kante des rückwärtigen Korbes (24) gekoppelt ist, und eine Stirnfläche aufweist, die an die rückwärtige Kante (21) des Schwingspulenkörpers (14) und die ringförmige Kante des Halses gekoppelt ist, wobei die Spinne den Schwingspulenkörper und den Hals federnd trägt.
- Lautsprecher nach Anspruch 1, bei demdie Spinne (10) sich über die gesamte Ausdehnung der unteren Öffnung des rückwärtigen Korbes (24) erstreckt; unddie rückwärtige Kante des Schwingspulenkörpers (14) und die ringförmige Kante (21) des Halses mit der Spinne an einer zentralen Rille (11), die in der Stirnfläche der Spinne angeordnet ist, gekoppelt sind.
- Lautsprecher nach Anspruch 4, bei demdie rückwärtige Kante des Schwingspulenkörpers (14) und die ringförmige Kante (21) des Halses mit der Spinne (10) bei einer zentralen Rille (11), die in der Stirnfläche der Spinne angeordnet ist, gekoppelt sind; undwobei die Spinne eine zentrale Öffnung umfaßt, die konzentrisch zu der ringförmigen Rille ist und einen Durchmesser hat, der kleiner als ein Durchmesser der ringförmigen Rille ist;wobei der Lautsprecher ferner eine Staubkappe (160) aufweist, die mit der Spinne gekoppelt ist und sich über die gesamte Ausdehnung der zentralen Öffnung erstreckt.
- Lautsprecher nach Anspruch 4, wobei
der Lautsprecher derart aufgebaut ist, daß er einen Abstand zwischen der Oberseite des vorderen Korbes (30) und dem Boden des rückwärtigen Korbes (24) von weniger als 18 cm (8 Inches) hat.
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 (de) | 1995-03-08 |
EP0642291A3 EP0642291A3 (de) | 1996-01-31 |
EP0642291B1 true EP0642291B1 (de) | 2002-02-13 |
Family
ID=22289525
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19940305330 Expired - Lifetime EP0642291B1 (de) | 1993-08-05 | 1994-07-20 | Lautsprechermembranbefestigung |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0642291B1 (de) |
JP (1) | JP3411400B2 (de) |
DE (1) | DE69429843T2 (de) |
Cited By (1)
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)
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)
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. |
-
1994
- 1994-07-20 EP EP19940305330 patent/EP0642291B1/de not_active Expired - Lifetime
- 1994-07-20 DE DE1994629843 patent/DE69429843T2/de not_active Expired - Lifetime
- 1994-08-03 JP JP18206794A patent/JP3411400B2/ja not_active Expired - Lifetime
Cited By (1)
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 |
---|---|
JPH07154895A (ja) | 1995-06-16 |
DE69429843T2 (de) | 2002-08-08 |
EP0642291A3 (de) | 1996-01-31 |
EP0642291A2 (de) | 1995-03-08 |
DE69429843D1 (de) | 2002-03-21 |
JP3411400B2 (ja) | 2003-05-26 |
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