DE925653C - Housing for electrodynamic cone loudspeakers with a deeply tuned membrane - Google Patents
Housing for electrodynamic cone loudspeakers with a deeply tuned membraneInfo
- Publication number
- DE925653C DE925653C DET931D DET0000931D DE925653C DE 925653 C DE925653 C DE 925653C DE T931 D DET931 D DE T931D DE T0000931 D DET0000931 D DE T0000931D DE 925653 C DE925653 C DE 925653C
- Authority
- DE
- Germany
- Prior art keywords
- housing
- membrane
- electrodynamic
- cone loudspeakers
- deeply
- 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
Links
- 239000012528 membrane Substances 0.000 title claims description 10
- 230000005520 electrodynamics Effects 0.000 title claims description 6
- 230000005855 radiation Effects 0.000 claims description 4
- 238000013016 damping Methods 0.000 claims description 2
- 239000000835 fiber Substances 0.000 claims 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- -1 felt Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2811—Enclosures comprising vibrating or resonating arrangements for loudspeaker transducers
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
-
- 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
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2884—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure
- H04R1/2888—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of the enclosure structure, i.e. strengthening or shape of the enclosure for loudspeaker transducers
Landscapes
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Description
Die gebräuchlichen Gehäuse für die üblichen elektrodynamischen Konuslautsprecher sind entweder hinten akustisch völlig geöffnet oder besitzen zumindest Löcher an den Seiten- und Hinterwänden, um zu vermeiden, daß störende Gehäuseresonanzen auftreten. Solche Resonanzen können in bekannter Weise auch dadurch vermieden werden, daß man die Rückseite des Lautsprechers durch einen akustischen Ohmschen Widerstand, ίο z. B. ein Blech mit zahlreichen engen Schlitzen, abdeckt, Ferner ist bekannt, ein allseitig mit Ausnahme dar Schallabstrahlungsseite der Membran geschlossenes Gehäuse zu benutzen, das über akustische Filter mit der Außenluft in Verbindung steht oder eine oder mehrere Öffnungen besitzt, die1 durch eine nicht angetriebene bewegliche Membran akustisch dicht abgeschlossen sind.The customary housings for the usual electrodynamic cone loudspeakers are either completely open acoustically at the rear or at least have holes on the side and rear walls in order to avoid disturbing housing resonances. Such resonances can be avoided in a known manner that the back of the speaker through an acoustic ohmic resistance, ίο z. B. a sheet with numerous narrow slots, covers, It is also known to use a housing that is closed on all sides with the exception of the sound radiation side of the membrane, which is in communication with the outside air via acoustic filters or has one or more openings that 1 through a not driven movable membrane are acoustically sealed.
Es hat sich nun herausgestellt, daß der Einfluß eines !abgeschlossenen Kastens dann veirhältnismäßig ungefährlich ist, wenn es sich um einen sehr flachen Kasten handelt, in den eine an sich tief abgestimmte, in dem für die Tiefabstimmung in Betracht kommenden Bereich jedoch verhältnismäßig hoch abgestimmte Membran eingesetzt ist, und wenn selbstverständlich ein gewisses minimales Volumen nicht unterschritten wird. Versuche haben ergeben, daß ζ. B. beim Einsetzen einer auf 140 Hz abgestimmten Membran in einen flachen, etwa 101 großen Kasten, der nicht ganz 50 mm tief war, die Eigenfrequenz durch Vergrößerung der Rückstellkraft nur auf 160 Hz ging, ohne daß irgendwelche störenden Erscheinungen außer diesem geringfügigen Ansteigen der Eigenfrequenz sich bemerkbar machten. Allgemein gesagt, bringt bei den üblichen Tiefenabmessungen der heutzutage benutzten elektrodynamischen Systeme ein abgeschlossenes Gehäuse dann keine Beeinträchtigungen der Wiedergabe mit sich, wenn, bezcgen auf die Abmessungen des Gehäuses, die Tiefe etwa 10 bis I5%> der größten Seiten- bzw. Längenabmessung des Gehäuses beträgt. Dies ist darauf zurückzuführen, daß bei solchen flachen Gehäusen die eingeschlossene Luftmasse eine im Verhältnis zum Volumen große Oberfläche besitzt. Es wird daher eine etwaige größere Bewegung der Luftteilchen beim Schwingen ■ der Membran, insbesondere durch Oberflächen- , reibung, stark gedämpft. Am größten wird diese Dämpfung, wenn das Verhältnis Oberfläche : Volumen des Luftpolsters groß ist, also ein sehr flaches Gehäuse benutzt wird, am geringsten, wenn ein kugelförmiges Gehäuse verwendet wird, da bekanntlich bei der Kugel das Verhältnis Oberfläche: Volumen am kleinsten ist.It has now been found that the influence of a closed box is relatively harmless if it is a very flat box in which a diaphragm which is inherently low, but relatively high in the area considered for low tuning is used, and if of course a certain minimum volume is not undershot. Tests have shown that ζ. B. when inserting a membrane tuned to 140 Hz in a flat, about 101 large box, which was not quite 50 mm deep, the natural frequency by increasing the restoring force only went to 160 Hz, without any disturbing phenomena except this slight increase in the natural frequency made themselves felt. Generally speaking, with the usual depth dimensions of the electrodynamic systems used today, a closed housing does not impair the reproduction if, in relation to the dimensions of the housing, the depth is about 10 to 15%> of the largest side or length dimension of the housing amounts to. This is due to the fact that in such flat housings the enclosed air mass has a large surface area in relation to the volume. It is therefore a possible greater movement of the air particles while swinging ■ the membrane, in particular by surface friction, highly attenuated. This attenuation is greatest when the surface: volume ratio of the air cushion is large, i.e. a very flat housing is used, and it is lowest when a spherical housing is used, as it is known that the surface: volume ratio of the sphere is the smallest.
Diese Tatsache gestattet die Ausbildung außerordentlich flacher Lautsprechergehäuse, die allseitig mit Ausnahme der Schallabstrahlungsseite! der Membran geschlossen sind und infolge ihrer flachen Ausbildung unauffällig an Wänden, Türen, Schränken, Schreibtischen u. dgl. untergebracht werden können. Auf diese Weise können die neuerdings entwickelten Lautsprechersysteme sehr geringer Bauhöhe technisch einwandfrei eingebaut und an dem Bestimmungsort angeordnet werden.This fact allows the formation of extremely flat loudspeaker housings on all sides with the exception of the sound radiation side! the membrane are closed and as a result of their flat Training can be housed inconspicuously on walls, doors, cupboards, desks and the like can. In this way, the recently developed loudspeaker systems can be very small Installation height technically flawlessly installed and arranged at the destination.
Die Erfindung betrifft dementsprechend ein allseitig mit Ausnahme der Schallabstrahlungsseite der Membran abgeschlossenes Gehäuse; für elektrodynamische Konuslautsprecher mit tief abgestimmter Membran, das dadurch gekennzeichnet ist, daß, bezogen auf die Inneniabmessungen, seine Tiefe, in Richtung· 'der Lautsprecherachse gemessen, nur 10 bis 15% der Breiten- bzw. der Längenabmessungen des Gehäuses, !höchstens etwa 60 mm beträgt, und daß die eingeschlossene Luftmasse eine im Verhältnis zu flhrem Volumen große Oberfläche aufweist. zu ihrem Volumen große Oberfläche aufweist.The invention accordingly relates to all sides with the exception of the sound radiation side the membrane closed housing; for electrodynamic cone speakers with deeply tuned Membrane, which is characterized in that, based on the internal dimensions, its depth, in Direction · 'of the loudspeaker axis measured, only 10 up to 15% of the width or length dimensions of the housing,! is at most about 60 mm, and that the enclosed air mass has a large surface area in relation to its volume. has a large surface area for its volume.
Die Abbildung veranschaulicht ein Ausführungsbeispiel des Erfindungsgegenstandes. In das Gehäuse ist der elektrodynamische Konus lautsprecher L eingesetzt. DieAbmessungen dieses Gehäuses betragen etwa Tiefe a = 50 mm, Breite b = 460 mm, Länge c = 520 mm. Die Wandstärke ist verhältnismäßig groß; sie beträgt etwa 8 mm. Dies ist erforderlich mit Rücksicht auf sonst auftretende Wandresonanzen. Selbstverständlich ist es möglich, auch mit dünneren Wänden auszukommen, wenn diese zusätzlich versteift oder in bekannter Weise mit dämpfenden Stoffen, wie Filz, Bleiblech u. dgl., belegt sind. Das Luftvolumen des Gehäuses beträgt etwa 10 1; die Erhöhung der Rückstellkraft durch das eingeschlossene Luftpolster ist geringfügig. Die Eigenfrequenz des Lautsprechers geht nur um etwa 10 bis 15% herauf, wenn die Grundresonanz ohne Gehäuse etwa zwischen 130 bis 180 Hz liegt.The figure illustrates an embodiment of the subject matter of the invention. The electrodynamic cone loudspeaker L is inserted into the housing. The dimensions of this housing are approximately depth a = 50 mm, width b = 460 mm, length c = 520 mm. The wall thickness is relatively large; it is about 8 mm. This is necessary in view of the wall resonances that may otherwise occur. Of course, it is also possible to get by with thinner walls if these are additionally stiffened or covered in a known manner with damping materials such as felt, lead sheet and the like. The air volume of the housing is about 10 1; the increase in the restoring force due to the enclosed air cushion is slight. The natural frequency of the loudspeaker only increases by around 10 to 15% if the basic resonance without the housing is around 130 to 180 Hz.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DET931D DE925653C (en) | 1937-10-22 | 1937-10-23 | Housing for electrodynamic cone loudspeakers with a deeply tuned membrane |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE844942X | 1937-10-22 | ||
DET931D DE925653C (en) | 1937-10-22 | 1937-10-23 | Housing for electrodynamic cone loudspeakers with a deeply tuned membrane |
Publications (1)
Publication Number | Publication Date |
---|---|
DE925653C true DE925653C (en) | 1955-03-28 |
Family
ID=25950136
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DET931D Expired DE925653C (en) | 1937-10-22 | 1937-10-23 | Housing for electrodynamic cone loudspeakers with a deeply tuned membrane |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE925653C (en) |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB248845A (en) * | 1924-12-12 | 1926-03-12 | John Sydney Robert James | Improvements in and relating to loud speakers for wireless telephony, and the like |
DE501735C (en) * | 1930-07-07 | Ideal Werke Akt Ges Fuer Draht | Funnelless loudspeaker in which the cone membrane is inserted into the front wall of a resonance box | |
FR688364A (en) * | 1929-01-17 | 1930-08-22 | Radio broadcaster | |
DE568088C (en) * | 1929-04-17 | 1933-01-14 | Georg Seibt A G Dr | Funnelless large area loudspeaker |
US1986856A (en) * | 1933-01-28 | 1935-01-08 | Rca Corp | Sound translating device |
US1995080A (en) * | 1929-06-27 | 1935-03-19 | Operadio Mfg Co | Loud speaker |
GB434563A (en) * | 1934-08-13 | 1935-09-04 | Philip Keston Turner | Improvements in and relating to baffles and containers for loud speakers |
-
1937
- 1937-10-23 DE DET931D patent/DE925653C/en not_active Expired
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE501735C (en) * | 1930-07-07 | Ideal Werke Akt Ges Fuer Draht | Funnelless loudspeaker in which the cone membrane is inserted into the front wall of a resonance box | |
GB248845A (en) * | 1924-12-12 | 1926-03-12 | John Sydney Robert James | Improvements in and relating to loud speakers for wireless telephony, and the like |
FR688364A (en) * | 1929-01-17 | 1930-08-22 | Radio broadcaster | |
DE568088C (en) * | 1929-04-17 | 1933-01-14 | Georg Seibt A G Dr | Funnelless large area loudspeaker |
US1995080A (en) * | 1929-06-27 | 1935-03-19 | Operadio Mfg Co | Loud speaker |
US1986856A (en) * | 1933-01-28 | 1935-01-08 | Rca Corp | Sound translating device |
GB434563A (en) * | 1934-08-13 | 1935-09-04 | Philip Keston Turner | Improvements in and relating to baffles and containers for loud speakers |
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