EP0433704B1 - Loudspeaker housing case - Google Patents
Loudspeaker housing case Download PDFInfo
- Publication number
- EP0433704B1 EP0433704B1 EP90122510A EP90122510A EP0433704B1 EP 0433704 B1 EP0433704 B1 EP 0433704B1 EP 90122510 A EP90122510 A EP 90122510A EP 90122510 A EP90122510 A EP 90122510A EP 0433704 B1 EP0433704 B1 EP 0433704B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing parts
- adhesive
- housing
- loudspeaker
- another
- 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
- 239000000853 adhesive Substances 0.000 claims description 28
- 230000001070 adhesive effect Effects 0.000 claims description 28
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 239000011324 bead Substances 0.000 description 10
- 125000006850 spacer group Chemical group 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/02—Casings; Cabinets ; Supports therefor; Mountings therein
- H04R1/021—Casings; Cabinets ; Supports therefor; Mountings therein incorporating only one transducer
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
- H04R31/006—Interconnection of transducer parts
Definitions
- the invention relates to a multi-part - in particular two-part - housing for receiving speakers.
- a housing is known for example from EP-A-0 021 455.
- an elastic rubber seal is arranged in the manufacture of high-quality loudspeaker receptacle housings before the mechanical connection between the mutually facing edges of the housing parts.
- This measure has the effect that, due to the effect of the rubber seal which compensates for the manufacturing tolerances, the force effects of the mechanical connecting elements for producing a continuous and tight connection of the housing parts are lower. This also reduces the tension in the housing parts and improves the auditory impression of the loudspeaker box.
- the invention has for its object to provide a multi-part speaker housing, the sound behavior is further improved.
- the object is achieved in that the housing parts forming the loudspeaker receptacle housing are floatingly glued to one another by an adhesive with a minimum layer thickness of 0.5 mm, a hardness of maximum 60 Shore A and a minimum elongation at break of 400%, the housing parts on their mutually facing edges glued throughout. This ensures that manufacturing tolerances on the housing edges are compensated for and, moreover, the housing parts thus arranged are completely tension-free.
- Claim 3 specifies a method for producing a glued loudspeaker housing.
- the adhesive By applying the adhesive with a layer thickness that exceeds the desired minimum adhesive thickness between the housing parts in the final state and by pressing the housing parts together at least during the curing time of the adhesive, the adhesive is distributed particularly well between the housing parts and almost the entire width of the edges uses the housing parts as an adhesive surface.
- Figure 1 shows a sectional view of a two-part loudspeaker receptacle housing with the loudspeaker inserted.
- Figure 2 shows a section of two housing parts at their interface in detail.
- Figure 3 shows a curing and shipping carton for glued loudspeaker housing.
- Figure 4 shows a further section of two housing parts at their interface in detail.
- FIG. 1 shows a loudspeaker receptacle housing 5 which has two housing parts 6, 7 and in which a loudspeaker 8 is inserted.
- the mutually facing ends 9, 10 of the housing parts 6, 7 are designed as flanges 11, 12.
- An adhesive bead 15 is arranged between the flange surfaces 13, 14 formed by the flanges 11, 14, which glues the two housing parts 6, 7 to one another throughout.
- the plastic bead 15 is formed from a Sika PUR adhesive with the manufacturer's name SikaTack®-Instant and has a hardness of 50 Shore A and an elongation at break of 600%.
- the thickness (D K ) of the adhesive bead 15 between the flange surfaces 13, 14 is 0.5 mm in the exemplary embodiment shown.
- Holding clips 16 are pushed onto the flanges 11, 12 in the direction of the arrow during the curing time of the adhesive bead 15.
- the center piece 17 of such a holding clip 16, the width (B) of which corresponds to the thickness (D K ) of the adhesive bead 15, is immersed in the gap 18 between the flange surfaces 13, 14 which is free of adhesive, while the resilient clip ends 19 the flanges 11 , 12 press against the center piece 17.
- the flange 12 has a blind hole 20 on its flange surface 14, into which a spacer 21 arranged on the flange surface 13 of the flange 11 engages and hits the bottom 22 of the blind hole 20.
- the overall length (B L ) of the spacer 21 corresponds to the depth (S T ) of the blind hole 20 plus the desired minimum adhesive thickness (D K ) of the plastic bead 15 which bonds the housing parts 6.7.
- the diameter (D S ) of the blind hole 20 exceeds the diameter ( D A ) of the spacer 21 is scarce.
- FIG. 3 illustrates a simple production example for realizing a glued loudspeaker receptacle housing 5.
- a two-part curing and transport box 23 made of molded plastic is used.
- the lower part 24 of the curing and transport box 23 has a receiving recess 25 into which the housing part 6 is inserted.
- the flange 11 of the housing part 6 then lies on the head side 26 of the lower part 24.
- the flange surface 13 is then provided with an adhesive bead 15.
- a housing part 7, already equipped with a loudspeaker 5, with the flange surface 14 is placed on the plastic bead 15.
- the spacers 21 and blind holes 20 located on the flange surfaces 13, 14 and described above in FIG.
- the upper part 27 of the receiving and transport box 23, which also contains a receiving recess 28, is then placed over the part of the loudspeaker receiving housing 5 protruding from the lower part 24.
- the upper part 27 Since the depth (T O ) of the receiving recess 28 of the upper part 27 is just below the height (H A ) of the part of the loudspeaker receiving housing 5 protruding from the lower part 24, the upper part 27 is pressed onto the lower part 24 by the force (P) along the direction of the arrow, so that the spacers 21 are placed on the bottom 22 of the blind hole 20.
- the force (P) required until the adhesive has hardened can be replaced by wrapping the upper part 27 and the lower part 24 of the receiving and transport carton 23 perpendicularly to their mutually facing edges with an adhesive strip (not shown) during a brief force (P) will.
- FIG. 4 shows another interface between two housing parts 6, 7 in Shown in detail, in deviation from FIG. 2, a self-tapping screw 29 is only guided through the flange 11 and the spacer 21 into a further blind hole 30 located at the bottom 22 of the blind hole 20.
- the force exerted by the screw 29 causes the two flange surfaces 13, 14 to be pressed against one another at least during the curing time of the adhesive.
- the screws 29 can be removed or can also remain in the flanges 11, 12, since it has been shown in comparison to removed screws 29 that up to a maximum of 4 screws 29 at the seams of two housing parts 6, 7 do not impair the auditory impression of the loudspeaker box .
- flange surfaces 13, 14 in each of the exemplary embodiments discussed above can be pretreated with a primer for better adhesion of the adhesive bead 15.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Description
Die Erfindung betrifft ein mehrteiliges - insbesondere zweiteiliges - Gehäuse zur Aufnahme von Lautsprechern. Ein solches Gehäuse ist zum Beispiel aus der EP-A-0 021 455 bekannt.The invention relates to a multi-part - in particular two-part - housing for receiving speakers. Such a housing is known for example from EP-A-0 021 455.
Seit geraumer Zeit besteht in der Lautsprechertechnik das Problem, mehrteilige Lautsprechergehäuse so miteinander zu verbinden, daß das Lautsprechergehäuse trotz der Mehrteiligkeit keinen oder nur einen vernachlässigungsfähigen Einfluß auf das Wiedergabeverhalten des Lautsprechers ausübt. Derartig nachteilige Eigenschaften mehrteiliger Lautsprechergehäuse rühren daher, daß die Gehäuseteile im statischen Zustand lokale Verspannungen aufweisen, die im dynamischen Zustand den Höreindruck der Lautsprecherbox beeinträchtigen. Diese Verspannungen haben ihre Ursache darin, daß die Gehäuseteile an ihren einander zugewandten Kanten nach wirtschaftlicher Betrachtungsweise unvermeidbare Fertigungstoleranzen aufweisen, zu deren Überwindung und Erzielung einer durchgängig planen Verbindung der Gehäuseteile an ihren einander zugewandten Kanten eine Vielzahl von Schrauben oder Schnappen als mechanisch wirkende Verbindungselement eingesetzt werden. Aus diesem Grunde wird bei der Fertigung hochwertiger Lautsprecheraufnahmegehäuse vor dem mechanischen Verbinden zwischen den einander zugewandten Kanten der Gehäuseteile eine elastische Gummidichtung angeordnet. Diese Maßnahme bewirkt, daß wegen der die Fertigungstoleranzen ausgleichenden Wirkung der Gummidichtung die Kraftwirkungen der mechanischen Verbindungselemente zur Erzeugung einer durchgängigen und dichten Verbindung der Gehäuseteile geringer ausfallen. Hierdurch werden auch die Verspannungen der Gehäuseteile reduziert und der Höreindruck der Lautsprecherbox verbessert.
Der Erfindung liegt die Aufgabe zugrunde, ein mehrteiliges Lautsprecheraufnahmegehäuse zu schaffen, dessen Klangverhalten noch weiter verbessert ist.For some time now there has been the problem in loudspeaker technology of connecting multi-part loudspeaker housings in such a way that the loudspeaker housing has no or only a negligible influence on the reproduction behavior of the loudspeaker despite the multipart structure. Such disadvantageous properties of multi-part loudspeaker housings result from the fact that the housing parts in the static state have local stresses which, in the dynamic state, impair the auditory impression of the loudspeaker box. This tension is due to the fact that the housing parts on their mutually facing edges have inevitable manufacturing tolerances from an economic point of view, to overcome and achieve a consistently flat connection of the housing parts on their mutually facing edges a variety of screws or snaps are used as a mechanically acting connecting element. For this reason, an elastic rubber seal is arranged in the manufacture of high-quality loudspeaker receptacle housings before the mechanical connection between the mutually facing edges of the housing parts. This measure has the effect that, due to the effect of the rubber seal which compensates for the manufacturing tolerances, the force effects of the mechanical connecting elements for producing a continuous and tight connection of the housing parts are lower. This also reduces the tension in the housing parts and improves the auditory impression of the loudspeaker box.
The invention has for its object to provide a multi-part speaker housing, the sound behavior is further improved.
Die Aufgabe wird dadurch gelöst, daß die das Lautsprecheraufnahmegehäuse bildenden Gehäuseteile schwimmend miteinander verklebt sind, indem ein Klebstoff mit einer Mindestschichtdicke von 0,5 mm, einer Härte von maximal 60 Shore A und einer Mindestbruchdehnung von 400 % die Gehäuse teile an ihren einander zugewandten Kanten durchgängig verklebt. Hierdurch wird sichergestellt, daß Fertigungstoleranzen an den Gehäusekanten ausgeglichen werden und überdies die so verfügten Gehäuseteile völlig verspannungsfrei aufeinanderstehen.The object is achieved in that the housing parts forming the loudspeaker receptacle housing are floatingly glued to one another by an adhesive with a minimum layer thickness of 0.5 mm, a hardness of maximum 60 Shore A and a minimum elongation at break of 400%, the housing parts on their mutually facing edges glued throughout. This ensures that manufacturing tolerances on the housing edges are compensated for and, moreover, the housing parts thus arranged are completely tension-free.
Als besonders vorteilhaft erweist sich nach der Erfindung der Umstand, daß auf ein aufwendiges mechanisches Verbinden der Gehäuseteile verzichtet werden kann und eine Lagerhaltung für elastische Gummidichtungen gänzlich entfällt.According to the invention, the fact that an expensive mechanical connection of the housing parts can be dispensed with and storage for elastic rubber seals is completely eliminated has proven to be particularly advantageous.
Eine vorteilhafte Weiterbildung der Erfindung ist in Anspruch 2 ausgeführt. Durch die Anordnung von Fixierhilfen an den einander zugewandten Kanten der Gehäuseteile wird nicht nur ein einfaches Zusammensetzen der Gehäuseteile und eine Verhinderung von Radialverschiebungen der Gehäuseteile während des Durchhärtens des Klebstoffes sichergestellt, sondern auch durch die Baulänge der Fixierhilfen die jeweils gewünschte Mindestklebstoffdicke zwischen den Gehäuseteilen gewährleistet.An advantageous development of the invention is set out in claim 2. The arrangement of fixing aids on the mutually facing edges of the housing parts not only ensures simple assembly of the housing parts and a prevention of radial displacements of the housing parts during the curing of the adhesive, but also ensures the desired minimum adhesive thickness between the housing parts due to the overall length of the fixing aids.
Anspruch 3 gibt ein Verfahren zur Herstellung eines geklebten Lautsprecheraufnahmegehäuses an. Durch den Auftrag des Klebers mit einer die jeweils gewünschte Mindestklebstoffdicke zwischen den Gehäuseteilen im Endzustand übersteigenden Schichtdicke und durch das Aufeinanderpressen der Gehäuseteile zumindest während der Durchhärtzeit des Klebers wird erreicht, daß sich der Klebstoff zwischen den Gehäuseteilen besonders gut verteilt und nahezu die gesamte Breite der Kanten der Gehäuseteile als Klebefläche ausnutzt.Claim 3 specifies a method for producing a glued loudspeaker housing. By applying the adhesive with a layer thickness that exceeds the desired minimum adhesive thickness between the housing parts in the final state and by pressing the housing parts together at least during the curing time of the adhesive, the adhesive is distributed particularly well between the housing parts and almost the entire width of the edges uses the housing parts as an adhesive surface.
Figur 1 zeigt eine Schnittdarstellung eines zweiteiligen Lautsprecheraufnahmegehäuses mit eingesetztem Lautsprecher.Figure 1 shows a sectional view of a two-part loudspeaker receptacle housing with the loudspeaker inserted.
Figur 2 zeigt einen Schnitt zweier Gehäuseteile an ihrer Nahtstelle im Detail.Figure 2 shows a section of two housing parts at their interface in detail.
Figur 3 zeigt einen Aushärte- und Transportkarton für geklebte Lautsprecheraufnahmegehäuse.Figure 3 shows a curing and shipping carton for glued loudspeaker housing.
Figur 4 zeigt einen weiteren Schnitt zweier Gehäuseteile an ihrer Nahtstelle im Detail.Figure 4 shows a further section of two housing parts at their interface in detail.
In Figur 1 ist ein Lautsprecheraufnahmegehäuse 5 dargestellt, welches zwei Gehäuseteile 6,7 aufweist und in welches ein Lautsprecher 8 eingesetzt ist. Die einander zugewandten Enden 9,10 der Gehäuseteile 6,7 sind als Flansche 11,12 ausgebildet. Zwischen den von den Flanschen 11,12 gebildeten Flanschflächen 13,14 ist eine Klebstoffwulst 15 angeordnet, welche die beiden Gehäuseteile 6,7 durchgängig miteinander verklebt. Die Kunststoffwulst 15 ist aus einem PUR-Klebstoff der Firma Sika mit der Herstellerbezeichnung SikaTack®-Instant gebildet und weist eine Härte von 50 Shore A und eine Bruchdehnung von 600 % auf. Die Dicke (DK) der Klebstoffwulst 15 zwischen den Flanschflächen 13,14 beträgt im dargestellten Ausführungsbeispiel 0,5 mm. Halteklammern 16 sind während der Durchhärtezeit der Klebstoffwulst 15 längs der Pfeilrichtung auf die Flansche 11,12 aufgeschoben. Das Mittelstück 17 einer derartigen Halteklammer 16, dessen Breite (B) der Dicke (DK) der Klebstoffwulst 15 entspricht, taucht dabei in den vom Klebstoff freien Spalt 18 zwischen den Flanschflächen 13,14 ein, während die federnd ausgebildeten Klammerenden 19 die Flansche 11,12 gegen das Mittelstück 17 drücken.1 shows a
In Figur 2 ist eine Nahtstelle zweier Gehäuseteile 6,7 im Detail dargestellt. In Abweichung zu Figur 1 weist der Flansch 12 an seiner Flanschfläche 14 ein Sackloch 20 auf, in welches ein an der Flanschfläche 13 des Flansches 11 angeordneter Abstandshalter 21 eingreift und auf dem Boden 22 des Sacklochs 20 aufstößt. Die Baulänge (BL) des Abstandshalters 21 entspricht der Tiefe (ST) des Sackloches 20 plus der gewünschten Mindestklebstoffdicke (DK) der die Gehäuseteile 6,7 verklebenden Kunststoffwulst 15. Der Durchmesser (DS) des Sackloches 20 übersteigt den Durchmesser (DA) des Abstandshalters 21 knapp.A seam of two
In Figur 3 ist ein einfaches Herstellungsbeispiel zur Realisierung eines geklebten Lautsprecheraufnahmegehäuses 5 veranschaulicht. Dazu wird ein zweiteiliger Aushärte- und Transportkarton 23 aus Formkunststoff verwendet. Das Unterteil 24 des Aushärte- und Transportkartons 23 weist eine Aufnahmevertiefung 25 auf, in die das Gehäuseteil 6 eingesetzt wird. Der Flansch 11 des Gehäuseteils 6 liegt hiernach auf der Kopfseite 26 des Unterteils 24 auf. Sodann wird die Flanschfläche 13 mit einer Klebstoffwulst 15 versehen. Im nächsten Arbeitsschritt wird ein bereits mit einem Lautsprecher 5 bestücktes Gehäuseteil 7 mit der Flanschfläche 14 auf die Kunststoffwulst 15 aufgesetzt. Die an den Flanschflächen 13,14 befindlichen und oben in Figur 2 beschriebenen Abstandshalter 21 und Sacklöcher 20 gewährleisten dabei ein genaues Zentrieren der Gehäuseteile 6,7 aufeinander und stellen sicher, daß die Klebstoffwulst 15 nicht etwa durch das Gewicht des Gehäuseteils 7 und des eingesetzten Lautsprechers 8 unter die gewünschte Mindestklebstoffdicke zusammengedrückt wird. Das Oberteil 27 des Aufnahme- und Transportkartons 23, welches ebenfalls eine Aufnahmevertiefung 28 enthält, wird sodann über das aus dem Unterteil 24 herausragende Teil des Lautsprecheraufnahmegehäuses 5 gestülpt. Da die Tiefe (TO) der Aufnahmevertiefung 28 des Oberteils 27 die Höhe (HA) des aus dem Unterteil 24 herausragenden Teils des Lautsprecheraufnahmegehäuses 5 knapp unterschreitet, wird durch Krafteinwirkung (P) längs der Pfeilrichtung das Oberteil 27 auf das Unterteil 24 gedrückt, so daß die Abstandshalter 21 auf dem Boden 22 des Sackloches 20 aufsetzen. Die bis zur Durchhärtung des Klebstoffs erforderliche Krafteinwirkung (P) läßt sich dadurch ersetzen, daß das Oberteil 27 und das Unterteil 24 des Aufnahme- und Transportkartons 23 während einer nur kurzzeitigen Krafteinwirkung (P) senkrecht zu ihren einander zugewandten Kanten mit einem nicht dargestellten Klebestreifen umwickelt werden.FIG. 3 illustrates a simple production example for realizing a glued
In Figur 4 ist eine weitere Nahtstelle zweier Gehäuseteile 6,7 im Detail dargestellt, wobei in Abweichung zu Figur 2 lediglich durch den Flansch 11 und den Abstandshalter 21 eine selbstschneidende Schraube 29 in ein am Boden 22 des Sacklochs 20 befindliches weiteres Sackloch 30 geführt ist. Die von der Schraube 29 ausgeübte Kraft bewirkt, daß die beiden Flanschflächen 13,14 zumindest während der Durchhärtzeit des Klebstoffs aufeinander gepreßt werden. Hiernach können die Schrauben 29 entfernt werden oder aber auch in den Flanschen 11,12 verbleiben, da sich im Vergleich zu entfernten Schrauben 29 gezeigt hat, daß bis zu maximal 4 Schrauben 29 an den Nahtstellen zweier Gehäuseteile 6,7 den Höreindruck der Lautsprecherbox nicht beeinträchtigen.FIG. 4 shows another interface between two
Es wird darauf hingewiesen, daß die Flanschflächen 13,14 in jedem vorstehend behandelten Ausführungsbeispiel zur besseren Haftung der Klebstoffwulst 15 mit einem Primer vorbehandelt sein können.It is pointed out that the
Claims (3)
- Multiple-part - especially two-part - housing for receiving loudspeakers,
characterized in that- the housing parts (6, 7) forming the loudspeaker receptacle are adhesively bonded to one another in a floating manner; and that- the adhesive continuously bonding the housing parts (6,7) at their edges (11, 12) facing one another has a minimum film thickness (DK) of 0.5 mm and a maximum hardness of 60 Shore A, as well as a minimum elongation at fracture of 400%. - Loudspeaker receptacle housing according to Claim 1,
characterized in that
the housing parts (6, 7) have, at their edges (11, 12) facing one another, fastening aids (16; 21) that allow easy assembly of the housing parts (6, 7), prevent mutual radial displacement of the housing parts (6, 7) until the adhesive has completely hardened, and because of their length ensure the particular desired minimum adhesive thickness (DK) between the housing parts (6, 7). - Method for producing a loudspeaker receptacle housing according to Claim 1,
characterized in that- the housing parts (6, 7) are adhesively bonded in a floating and continuous manner at their edges (11, 12) facing one another by means of an adhesive which after complete hardening has a maximum hardness of 60 shore A and a minimum elongation at fracture of 400%, such that the adhesive is applied with a film thickness which exceeds a particular desired minimum film thickness that is at least 0.5 mm in the final state; and- the housing parts (6, 7) adhesively bonded in each case are pressed together at least during the time the adhesive is completely hardening.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3941734A DE3941734A1 (en) | 1989-12-18 | 1989-12-18 | SPEAKER RECORDING HOUSING |
| DE3941734 | 1989-12-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0433704A2 EP0433704A2 (en) | 1991-06-26 |
| EP0433704A3 EP0433704A3 (en) | 1992-04-01 |
| EP0433704B1 true EP0433704B1 (en) | 1994-06-08 |
Family
ID=6395692
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90122510A Expired - Lifetime EP0433704B1 (en) | 1989-12-18 | 1990-11-26 | Loudspeaker housing case |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0433704B1 (en) |
| DE (2) | DE3941734A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19815751C2 (en) * | 1998-04-08 | 2000-10-26 | Matthias Petig | Loudspeaker with a loudspeaker housing formed from several components |
| DE10330453A1 (en) * | 2003-07-05 | 2005-01-27 | Karosseriewerk Krämer GmbH | Wall structure for absorption of airborne sound comprises two boundary layers and a compound separation layer forming spaces which are filled with an absorption material |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2260983A1 (en) * | 1972-12-13 | 1974-06-20 | Geb Otten Marita Preuss | SPEAKER BOX |
| DE2922998A1 (en) * | 1979-06-07 | 1980-12-18 | Braun Ag | SPEAKER HOUSING |
| DE8303355U1 (en) * | 1983-02-08 | 1983-06-16 | Hornaff, Bernd, 6900 Heidelberg | SPEAKER HOUSING |
| JPS60236398A (en) * | 1984-05-09 | 1985-11-25 | Fujitsu Ten Ltd | Manufacture of speaker box |
| JPS61210794A (en) * | 1986-03-06 | 1986-09-18 | Pioneer Electronic Corp | Sound cabinet |
-
1989
- 1989-12-18 DE DE3941734A patent/DE3941734A1/en not_active Withdrawn
-
1990
- 1990-11-26 EP EP90122510A patent/EP0433704B1/en not_active Expired - Lifetime
- 1990-11-26 DE DE59006041T patent/DE59006041D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0433704A2 (en) | 1991-06-26 |
| EP0433704A3 (en) | 1992-04-01 |
| DE59006041D1 (en) | 1994-07-14 |
| DE3941734A1 (en) | 1991-06-20 |
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