EP1236375A2 - Flachlautsprecheranordnung für tieftonwiedergabe - Google Patents
Flachlautsprecheranordnung für tieftonwiedergabeInfo
- Publication number
- EP1236375A2 EP1236375A2 EP00979559A EP00979559A EP1236375A2 EP 1236375 A2 EP1236375 A2 EP 1236375A2 EP 00979559 A EP00979559 A EP 00979559A EP 00979559 A EP00979559 A EP 00979559A EP 1236375 A2 EP1236375 A2 EP 1236375A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- membrane
- low
- frequency
- plate
- 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.)
- Granted
Links
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- 230000011514 reflex Effects 0.000 claims description 26
- 238000009423 ventilation Methods 0.000 claims description 13
- 239000006260 foam Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 230000005284 excitation Effects 0.000 claims description 3
- 238000005452 bending Methods 0.000 claims description 2
- 108090000623 proteins and genes Proteins 0.000 claims 1
- 230000000694 effects Effects 0.000 description 15
- 230000005540 biological transmission Effects 0.000 description 9
- 238000005192 partition Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 4
- 230000018109 developmental process Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000013016 damping Methods 0.000 description 2
- 230000003760 hair shine Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000876833 Emberizinae Species 0.000 description 1
- 229920000784 Nomex Polymers 0.000 description 1
- 239000004642 Polyimide Substances 0.000 description 1
- 229910000639 Spring steel Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 210000001520 comb Anatomy 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005520 electrodynamics Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 239000004763 nomex Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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- 230000002265 prevention Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
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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
- 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
- H04R1/2815—Enclosures comprising vibrating or resonating arrangements of the bass reflex type
- H04R1/2819—Enclosures comprising vibrating or resonating arrangements of the bass reflex type 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
- H04R1/26—Spatial arrangements of separate transducers responsive to two or more frequency ranges
-
- 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
- H04R1/2838—Enclosures comprising vibrating or resonating arrangements of the bandpass type
- H04R1/2842—Enclosures comprising vibrating or resonating arrangements of the bandpass type 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
- H04R5/00—Stereophonic arrangements
- H04R5/02—Spatial or constructional arrangements of loudspeakers
-
- 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
- H04R7/04—Plane diaphragms
- H04R7/045—Plane diaphragms using the distributed mode principle, i.e. whereby the acoustic radiation is emanated from uniformly distributed free bending wave vibration induced in a stiff panel and not from pistonic motion
-
- 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
- H04R1/283—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm
- H04R1/2834—Enclosures comprising vibrating or resonating arrangements using a passive diaphragm 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
- H04R1/2807—Enclosures comprising vibrating or resonating arrangements
- H04R1/2861—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn
- H04R1/2865—Enclosures comprising vibrating or resonating arrangements using a back-loaded horn 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
- H04R2440/00—Bending wave transducers covered by H04R, not provided for in its groups
- H04R2440/07—Loudspeakers using bending wave resonance and pistonic motion to generate sound
Definitions
- the invention relates to a flat speaker arrangement for bass reproduction with a front opening, flat, non-radiating housing enclosing a housing volume, a plate membrane arranged within the front opening of the housing and a tensioning membrane arranged between the housing and the plate membrane for holding and sealing the plate membrane with respect to the housing.
- the currently most modern plate loudspeaker principle the multi-resonance plate loudspeaker (Distributed Mode Loudspeaker, DML), offers a high reproduction quality with a very low construction depth ("Tönendes Marsh auf dem Wand”) and relatively little manufacturing effort.
- DML distributed Mode Loudspeaker
- These are lightweight, self-supporting, framed, weakly damped homogeneous rigid foam panels or lightweight sandwich panels with top layers that have high expansion shaft speeds.
- the air cushion between the wall and the panel loudspeaker with a decreasing distance acts as an ever harder spring, which, in combination with the wall reflex and also with increasing friction losses, significantly impedes the low-frequency deflection of the panel loudspeaker - the "wall effect".
- An arrangement is known from WO 97/09849 in which the back of a multi-resonance plate is shielded by a housing (box) in order to improve the low-frequency reproduction.
- An electropneumatic coupling of an arrangement for air pressure variation (pump) with a multi-resonance plate produces a low-frequency, monophase plate movement. Due to its size, however, the woofer system is accommodated in an additional housing, which in turn has to be placed away from the multi-resonance plate and its housing due to its size. There- with the bass reproduction is improved, but in return the spatial compactness is lost.
- the object of the invention is therefore to provide a flat loudspeaker arrangement which offers improved low-frequency reproduction without the need to place electroacoustic units separately.
- the flat housing is used both in the generation of sound and also for shielding the plate diaphragm.
- the housing not only serves as a rear closure of the plate diaphragm (prevention of the "dipole effect"), but also, when using a woofer arrangement, for example as a pressure chamber for the woofer arrangement.
- a woofer arrangement for example as a pressure chamber for the woofer arrangement.
- an inertial oscillator when used, it can also serve as a resonance body. This at least double use advantageously reduces the space requirement in such a way that integration into a single, flat housing is possible.
- one or more sound transducers are attached to the housing and / or the plate membrane for double use in such a way that the sound transducer membrane forms part of the outer wall of the housing, the plate membrane (1) being self-supporting and damped and a suitable coupling between the sound transducer ⁇ one hand and on the other plate diaphragm and the housing is provided on the part.
- the use of a housing specifies a defined volume of air which closes the plate membrane at the rear and to which the plate membrane is matched, so that the so-called "wall effect" is practically eliminated.
- the use of a separate sound transducer and a plate diaphragm largely avoids the "impact effect", since the separate sound transducer can be designed for a much larger stroke than a plate loudspeaker.
- the arrangement according to the invention can also be used in such a way that an additional sound transducer according to the invention serves to support and improve an already existing plate loudspeaker.
- a wall of the housing is preferably formed entirely by the plate membrane.
- the plate membrane has a plate-shaped, light, shear-resistant core, which is connected to the entire surface on both flat sides with a very hard, thin cover sheet.
- the sandwich core consists, for example, of fiber-reinforced, resin-impregnated paper (such as Nomex paper) with a honeycomb structure or of a hard foam structure (such as Polymid) and is covered on the front and back with a hard, thin sandwich cover sheet (preferably an epoxy resin film reinforced with carbon or glass fiber, a film made of light metal alloy, thin glass or special paper) glued or welded.
- the plate membrane can be flat or slightly curved.
- the plate membrane can be provided only to low-frequency response or even to ⁇ How dergabe medium and high clays are used.
- medium and / or high-frequency flexural wave drivers in the frequency range mainly above the fundamental frequency of the plate membrane can also be mechanically coupled to the latter.
- the plate membrane can, for example, be held on the housing with or without the aid of a rigid frame by means of suitable storage (for example a circumferential, tight tensioning membrane which can completely or partially move the plate membrane on one or both sides).
- suitable storage for example a circumferential, tight tensioning membrane which can completely or partially move the plate membrane on one or both sides.
- the plate membrane is fastened by means of the tension membrane to a rigid frame, which in turn is attached to the housing.
- the coupling of sound transducers can be done in different ways, whereby both the type of coupling itself and aids such as sound boxes, horn arrangements, funnel arrangements etc. can be adapted accordingly to the respective application and the respective acoustic requirements .
- sound transducers such as cone loudspeakers or inertial transducers
- plate diaphragm can be done in different ways, whereby both the type of coupling itself and aids such as sound boxes, horn arrangements, funnel arrangements etc. can be adapted accordingly to the respective application and the respective acoustic requirements .
- the preferred embodiments of a flat loudspeaker arrangement according to the invention explained below relate, inter alia, to some particularly suitable couplings and aids.
- the housing is formed by a in its interior hermetically sealed partition wall situated in two each divided ⁇ chambers a partial volume enclosing Kam and the intermediate wall has an opening, in the hermetically sealed, a low-frequency speaker terminals order one or more woofer introduced cone speakers is such that its membrane (s) th to Sei two ⁇ / are provided with one of the partial volume in communication.
- the plate membrane has a breakthrough into which a low-frequency loudspeaker arrangement is introduced in a hermetically sealed and vibration-insulated manner such that its membrane (s) is connected to the housing volume on one side and to the outside air on the other side / stand.
- the housing has an opening, into which a low-frequency loudspeaker arrangement is hermetically sealed in such a way that its membrane (s) is / are connected to the housing volume on one side and to the outside air on the other side ,
- a duct leading from the housing volume to the outside air is coupled with a diaphragm of the low-frequency loudspeaker arrangement to form a funnel for the low-frequency cone loudspeaker, forming a horn loudspeaker, the length and cross section of the Dukts are adapted to the respective conditions.
- one or more low-frequency inertial vibrators can also be provided, which are attached to the plate membrane and are acoustically coupled to it.
- a bass reflex tube leading from the housing volume to the outside air and / or a duct leading from the housing volume to the outside air can be provided to support the ventilation of the housing.
- the bass reflex tube is used in particular to (resonance) the effect To improve the degree of flat speaker arrangement in low tones.
- one or both chambers can be ventilated accordingly.
- the housing has an opening opposite the plate membrane, which preferably has the size of a wall.
- the housing is surrounded, for example, by a hermetically sealed, deep frame, which then forms a flat housing that is open to the rear.
- the membrane (s) of the woofer arrangement preferably has / have non-radiating contact with the housing volume via a surface, and the plate membrane has at least one window through which ventilation is carried out (preferably towards the listener side).
- the diaphragm (s) of the woofer assembly with a surface has non-radiating contact with the housing volume and the plate membrane has at least one window through which sound is ventilated into another housing (or another chamber of a housing with two chambers).
- the low-frequency loudspeaker system can at least partially protrude through the window (s) on the back, and a sleeve can be attached to the panel membrane for reinforcing the breakthrough edge and for non-radiative sealing.
- a spring element is connected to the plate membrane and the housing in a tensile, bending moment-transmitting, low-friction and tensioned manner.
- the spring element can be made of spring steel, brass, aluminum or plastic.
- the plate membrane and housing can be connected to one another with low friction by means of a circumferential foam bead. The soft foam bead then acts as a low-friction articulated bearing that can absorb tension.
- a conventional loudspeaker power amplifier can be used in the case of a sufficiently large housing volume and, in the case of a small housing volume, a negative impedance or a negative impedance converter that fully or partially compensates for the electrical impedance of the loudspeaker arrangement or the inertial floating.
- Figure 1 shows a first embodiment of a flat speaker arrangement according to the invention with three low-frequency cone speakers of a closed box;
- Figure 2 shows a second embodiment of a flat speaker arrangement according to the invention with five bass cone speakers in a closed box
- Figure 3 shows a first embodiment of a storage for a plate membrane
- Figure 4 shows a second embodiment of a storage for a plate membrane
- Figure 5 shows a third embodiment of a storage for a plate membrane
- Figure 6 shows a fourth embodiment of a storage for a plate membrane
- FIG. 7 shows a third embodiment of a flat loudspeaker arrangement according to the invention with a bass cone loudspeaker arranged at the rear in a closed box;
- FIG. 8 shows a fourth embodiment of a flat loudspeaker arrangement according to the invention with a bass cone loudspeaker arranged on the side in a closed box;
- FIG. 9 shows a fifth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker arranged in the rear in a closed box with additional horn;
- FIG. 10 shows a sixth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a two-chamber box with bass reflex tube;
- FIG. 11 shows a seventh embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box with a bass reflex tube;
- FIG. 12 shows an eighth embodiment of a flat loudspeaker arrangement according to the invention with several low-frequency cone loudspeakers in a box with a double bass reflex tube;
- FIG. 13 shows a ninth embodiment of a flat loudspeaker arrangement according to the invention with a bass cone loudspeaker arranged on the side in a box with a bass reflex tube;
- FIG. 14 shows a tenth embodiment of a flat loudspeaker arrangement according to the invention with a rear-facing orderly low-frequency cone speaker in a box with bass reflex tube;
- FIG. 15 shows an eleventh embodiment of a flat loudspeaker arrangement according to the invention with a bass cone loudspeaker arranged at the rear in a box with a bass reflex tube and duct;
- FIG. 16 shows a twelfth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a two-chamber box with bass reflex tube;
- FIG. 17 shows a thirteenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box with a duct;
- FIG. 18 shows a fourteenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box with a duct;
- FIG. 19 shows a fifteenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box with a bass reflex tube and duct;
- FIG. 20 shows a sixteenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box with a duct;
- FIG. 21 shows a seventeenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency cone loudspeaker in a box having two chambers;
- FIG. 23 shows a nineteenth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency inertial oscillator in a closed box;
- FIG. 24 shows a twentieth embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency inertial oscillator in a closed box with a bass reflex tube;
- FIG. 25 shows a twenty-first embodiment of a flat loudspeaker arrangement according to the invention with a low-frequency inertial oscillator in a closed box with duct;
- FIG. 26 shows a twenty-second embodiment of a flat speaker arrangement according to the invention with a low-frequency inertial transducer in a box that is open on the rear;
- a plate membrane 1 has a longer and a shorter diameter in the plate plane ("longitudinal direction", “transverse direction”), that it is held in a frame 2 by a hermetically tight clamping membrane 3 and that Frame 2 forms the side wall of a (flat) box (housing).
- the (flat) box can be divided into two chambers by an internal partition 4, only one chamber (main chamber) being delimited on one side by the plate membrane 1.
- a separate low-frequency drive is also provided, which activates the plate membrane in the low-frequency range by "pumping movement”.
- the exemplary embodiments thus relate to a broadband multi-resonance plate loudspeaker which has a multi-resonance sound plate with optional resonance combs and at least one low-tone electromechanical sound transducer (for example "pump speaker”, “shaker” etc.) and a resonance chamber, one wall of which is formed by the sound plate.
- This chamber will be referred to as the "main chamber” regardless of the total number of chambers.
- the membrane of the sound transducer for low tones thus forms part of the wall of the main chamber.
- the other side of the sound transducer membrane, which faces outward from the main chamber, can be part of a further chamber (“secondary chamber”).
- the hardness of the air spring behind a loudspeaker diaphragm is reduced by ventilation with the following measures: ventilation of the main chamber or possibly ventilation of the secondary chamber.
- ventilation of the main chamber or possibly ventilation of the secondary chamber.
- a resonance frequency will be obtained according to the bass reflex principle or according to the "Transmission-Lme" -P ⁇ nz ⁇ p.
- the damping can also be adjusted by selecting the cross-sectional profile.
- the shaker one or more is positioned differently than the mid-high drivers: either close to the center to emphasize the beam mode or in Baik knot areas for non-resonant demand for the piston movement.
- the cone pump creates low-frequency fluctuations in air pressure in the main chamber. A force transformation takes place in the ratio of the areas of the plate membrane to the pump membrane. A side effect is the possibility of sound radiation from the back
- pumps are used in the exemplary embodiments: a) “absorber cone”: the radiant power of the cone pump is absorbed in the loudspeaker housing; b) "plate cone”: cone pump directly in the “main chamber plate”; the electro-pneumatic pump chassis sits elastically in a hermetically sealed frame, which is arranged in an opening in the sound plate, and shines directly to the front; c) "Cone pump sits directly in the main chamber”: The electro-pneumatic pump chassis rests elastically in a hermetically sealed frame in an opening in the main chamber wall - but not the sound plate - and shines directly outwards; d) "Main chamber horn”: (The outside of the cone pump membrane forms the inner closure and drive of an acoustic "horn funnel”; e) Shaker as a pump.
- FIG. 1 illustrating the basic concept of the invention includes, among other things, a sound plate 6, which consists of a plate membrane 1 (sandwich panel) and mid-high driver 5 and which is combined with a closed, flat box 1, 2, 4, 9 is that it represents the front flat wall of this box 1, 2, 4, 9.
- the main chamber 7 of the box 1, 2, 4, 9 adjoining the sound plate 6 acts as a low-frequency force transformer in that the pressure fluctuations generated by a low-frequency loudspeaker arrangement 8 with a small membrane area react with the elastic plate membrane 1.
- the low-frequency speaker arrangement 8 consists, for example, of three low-frequency cone speakers, one of which is fastened to the plate diaphragm 1, one to the frame 2 and one to the intermediate wall 4 of the box 1, 2, 4, 9 such that the diaphragms of the low frequency -Loudspeaker arrangement form 8 parts of the walls.
- the plate membrane 1 is fastened to the frame 2 by a tensioning membrane 3 and is held elastically by this.
- the low-frequency acoustic short circuit (“dipole effect") is largely reduced by the shielding effect of Box 1, 2, 4, 9 and the low-frequency effect of the flat speaker is increased by the pumping effect.
- the multi-resonance sound plate realized in this way as the actual main radiator offers an extensive broadband range from the bass to the high-frequency range.
- the exemplary embodiment according to FIG. 2 has been modified from that shown in FIG. 1 in that a low-frequency loudspeaker arrangement 11 is provided instead of the low-frequency loudspeaker arrangement 8, which comprises five low-frequency cone loudspeakers.
- Two of the low-frequency cone speakers are inserted in openings in the plate diaphragm 1, two in openings in the intermediate wall 4 and one in an opening in the frame 2 and fastened accordingly.
- the bass cone speakers located in the diaphragm 1 and the partition 4 one is directed inwards and one is directed outwards.
- the bass cone loudspeaker housed in frame 2 is directed outwards.
- frame 2 and side wall 9 have ventilation device 12.
- the air-tight sealing-promoting fe ⁇ by a surrounding foam seal is 13 achieved, which is inserted in a frame groove 14 (eg glued).
- a thin pinhole 15 acoustically transparent, perforated hard foil made of metal or plastic
- the airtight resilient seal is achieved by a circumferential tensioning film 16 which is fastened (e.g. glued) to a circumferential flange 17 of the box 1, 2, 4, 9.
- the pinhole 15 can also be optionally provided.
- a special feature is the friction-free vibration gap 18, through which on the one hand the edge of the plate membrane 1 is separated from the flange 17 only by a barely visible, narrow space 19 and which, on the other hand, allows a sufficient width 20 of the resilient tensioning film 16 so that the edge vibration is not impeded becomes.
- Another special feature is that with this configuration the front surfaces of the plate membrane 1 and flange 17 can be adjusted in one plane, so that the perforated diaphragm 15 with the associated spacing profile 21 could also be omitted here.
- FIG. 5 shows a highly simplified, inexpensive embodiment.
- the airtight resilient seal is achieved by a circumferential tensioning film 22 which is attached (e.g. glued) to a circumferential flange 23 of the box 1, 2, 4, 9.
- the tensioning film 22 is glued flat on the simplified profiled flange 23.
- FIG. 6 finally shows a strongly embossed, circumferential tensioning membrane 24 made of a material with elastic dimensional stability, such as, for example, films made of aluminum, polyimide or fiber composite, which are attached to a flange 25 of the frame 2. on the one hand and the plate membrane 1 on the other hand is fastened, for example, by gluing or welding.
- a strongly embossed, circumferential tensioning membrane 24 made of a material with elastic dimensional stability, such as, for example, films made of aluminum, polyimide or fiber composite, which are attached to a flange 25 of the frame 2.
- the plate membrane 1 on the other hand is fastened, for example, by gluing or welding.
- the plate diaphragm 1 is in turn held by a circumferential, tight tensioning diaphragm 3 as the outer wall of a flat, hermetically sealed box 1, 2, 29.
- a circumferential, tight tensioning diaphragm 3 as the outer wall of a flat, hermetically sealed box 1, 2, 29.
- an active low-frequency loudspeaker arrangement used with only one low-frequency cone speaker 26, the membrane of which is connected on one side to the outside air and on the other side to the chamber volume 27, with the cone speaker 26 in various embodiments either in the large rear wall 29 (FIG. 7) or in the frame 2 forming the side wall (FIG. 8) can be used.
- FIG. 9 The embodiment shown in FIG. 9 is further developed compared to the exemplary embodiment according to FIG. 7 in such a way that an active low-frequency loudspeaker arrangement with low-frequency cone loudspeaker 26 is used in a hermetically sealed breakthrough of the passive box house, the membrane of which on one side with the chamber volume 27 and up the other side is connected to the outside air via a duct, the cone loudspeaker 26 and duct 28 together forming a horn loudspeaker.
- the duct is realized by means of plane-parallel walls (partition wall 4 and rear wall 29) as well as duct side walls 30.
- the connection of duct 28 and membrane of the low-frequency cone loudspeaker 26 is established through openings 32 in the loudspeaker chassis.
- the intermediate wall 4 can have a taper 33 in the region of the mid-high driver 5.
- a box 1, 2, 34, 29 is divided into two chambers 35, 36 by an internal hermetically sealed intermediate wall 34 in such a way that a main chamber 35 adjoining the plate membrane 1 is separated from a secondary chamber not adjoining the plate membrane 1 36 can be distinguished.
- the active low-frequency loudspeaker arrangement with low-frequency cone loudspeaker 26 is inserted into a hermetically sealed opening in the intermediate wall 34, the membrane of which is connected to one of the two chamber volumes on each side.
- the main chamber 35 is ventilated to the outside via a bass reflex tube 37.
- FIGS. 11 and 12 have a hermetically sealed, vibration-insulated breakthrough in the plate membrane 1, into which an active low-frequency loudspeaker arrangement with a low-frequency cone loudspeaker 26 (FIG. 11) or a plurality of low-frequency cone loudspeakers 39, 40 (FIG. 12 ), the membrane or membranes of which are / are connected on one side to the outside air and on the other to the chamber volume, the chamber being ventilated to the outside via a bass reflex tube 37.
- a further bass reflex tube 38 is also provided, and the mid-high drivers 5 from FIG.
- FIGS. 13 and 14 have been modified from those in FIGS. 8 and 7 in such a way that a bass reflex tube 37 of a certain length 46 projects through an opening in the frame 2 into the chamber volume.
- the embodiment according to FIG. 15 emerges from that of FIG. 5, the duct 28 forming a transmission line in FIG. 15 and the chamber 27 being ventilated by a bass reflex tube 37.
- the bass reflex tube 37 can alternatively also ventilate the secondary chamber 36 instead of the main chamber 35.
- the plate membrane 1 is held by a circumferential, tight tension membrane 3 and is used as the outer wall of a flat, hermetically sealed box 1, 2, 4, 50.
- An active low-frequency loudspeaker arrangement with low-frequency cone loudspeaker 26 is used in a hermetically sealed, vibration-isolated opening of the plate membrane 1, the membrane of which is connected on one side to the outside air and on the other side to the chamber volume, the box 1, 2, 4, 50 is in turn connected to the outside air via a duct 47 forming a transmission line.
- the coupling of the duct 47 to the chamber volume takes place via an opening 48, the duct 47 being in contact with the outside air via a further opening 49 and being formed by the frame 2 and partition 4 of the box 1, 2, 4, 50 and a rear wall 50 ,
- FIG. 18 shows an arrangement in which, starting from the arrangement according to FIG. 8, a duct 47 is coupled.
- the coupling of the domestic product 47 to the chamber volume takes place, in turn, via an opening 48, wherein the DUCT 47 has contact via ei ⁇ ne further opening 49 to the outside air and by Frame 2 and partition 4 of the box 1, 2, 4, 50 and a further rear wall 50 is formed.
- the embodiment according to FIG. 19 is based on a closed passive box 1, 2, 4, 50 in a hermetically sealed opening in the intermediate wall 4 of the box 1, 2, 4, 50, an active low-frequency loudspeaker arrangement with low-frequency cone loudspeaker 26, the membrane of which is used communicates with the chamber volume on one side and with the outside air via a duct 51, the low-frequency cone loudspeakers 26 and duct 51 together form a horn loudspeaker and the box 1, 2, 4, 50 additionally via a further duct 53 forming a transmission line is connected to the outside air.
- the ducts 51 and 53 are formed by frame 2 and partition 4 of the box 1, 2, 4, 50, a further rear wall 50 and a duct wall 52.
- the plate membrane 1 held by a circumferential, tight tensioning membrane 3 is used as the outer wall of a flat, hermetically sealed box 1, 2, 34, 50, which is divided into two chambers 55, 56 by an internal hermetically sealed partition wall 54 is subdivided in such a way that a main chamber 55 adjacent to the plate membrane 1 can be distinguished from a secondary chamber 56 not adjacent to the plate membrane 1.
- a hermetically sealed opening in the intermediate wall 54 a low-frequency cone loudspeaker 26 is used, the diaphragm of which borders on one of the two chamber volumes on both sides, the secondary chamber 56 communicating with the outside air via a duct 57 forming a transmission line.
- FIG. 21 and 22 show two basic forms of closed boxes 1, 2, 34, 29, one of which (FIG. 22) has only one chamber 27 and the other (FIG. 21) has two chambers 35, 36 which are hermetically sealed and separated from one another by an intermediate wall 34.
- the low-frequency cone loudspeaker 26 is accommodated in an opening in the intermediate wall 34 and is in contact with both chamber volumes via one side of its membrane in each case.
- the low-frequency cone loudspeaker 26 is inserted in an opening in the plate diaphragm 1.
- FIG. 23 A basic form of a hermetically sealed, closed box 1, 2, 29 with a low-frequency shaker 58 (low-frequency inertial vibrator) as a sound transducer for low frequencies is shown in FIG.
- the low-frequency shaker 58 is fastened to the plate membrane 1 from the inside in such a way that it can act as a low-frequency auxiliary drive for the plate membrane 1, i.e. is positioned in the central area to support the beam modal resonance or in a node zone of the first beam mode.
- FIG. 24 A further development of the arrangement according to FIG. 23 is shown in that a bass reflex tube 37 is inserted into the frame 2 for ventilation of the box 1, 2, 29.
- a duct 59 forming a transmission line is coupled to the chamber volume via an opening 60 on the intermediate wall 4 of the boxes 1, 2, 29, the duct 59 through the frame 2 and a rear wall 61 is realized in connection with the intermediate wall 4.
- the plate membrane 1 is in turn held by a circumferential, tight tension membrane 3, which in turn is surrounded by a hermetically sealed, deep frame 2.
- the rear wall of the box 1, 2, 29 is formed by the wall to which the box 1, 2, 29 is attached.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Multimedia (AREA)
- Obtaining Desirable Characteristics In Audible-Bandwidth Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19955867A DE19955867A1 (de) | 1999-11-22 | 1999-11-22 | Flachlautsprecheranordnung für Tieftonwiedergabe |
DE19955867 | 1999-11-22 | ||
PCT/EP2000/011259 WO2001039541A2 (de) | 1999-11-22 | 2000-11-14 | Flachlautsprecheranordnung für tieftonwiedergabe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1236375A2 true EP1236375A2 (de) | 2002-09-04 |
EP1236375B1 EP1236375B1 (de) | 2005-01-19 |
Family
ID=7929725
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00979559A Expired - Lifetime EP1236375B1 (de) | 1999-11-22 | 2000-11-14 | Flachlautsprecheranordnung für tieftonwiedergabe |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1236375B1 (de) |
DE (2) | DE19955867A1 (de) |
WO (1) | WO2001039541A2 (de) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2368484B (en) * | 2000-10-25 | 2004-06-16 | B & W Loudspeakers | Distributed mode panel type loudspeakers |
US7002070B2 (en) | 2001-06-22 | 2006-02-21 | Shelley Katz | Electronic piano |
DE10238325A1 (de) | 2002-08-16 | 2004-03-11 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Lautsprecher |
EP1392080A3 (de) * | 2002-08-17 | 2004-12-22 | KH Technology Corporation | Lautsprechereinheit und Anordnung |
GB2392043B (en) * | 2002-08-17 | 2006-03-22 | K H Technology Corp | Combination loudspeaker unit |
KR20100063142A (ko) * | 2003-01-22 | 2010-06-10 | 월드렙주식회사 | 사운드 생성을 위한 장치 및 방법 |
GB2422265B (en) * | 2003-01-22 | 2007-08-08 | Shelley Katz | Electrical and electronic musical instruments |
AU2008200358B2 (en) * | 2003-01-22 | 2009-12-03 | Shelley Katz | Electrical and electronic musical instruments |
DE102004021546A1 (de) * | 2004-05-03 | 2005-12-08 | Avantgarde Acoustic Lautsprechersysteme Gmbh | Hornlautsprecher |
KR100698256B1 (ko) * | 2004-07-16 | 2007-03-22 | 엘지전자 주식회사 | 디스플레이 윈도우를 이용한 스피커 장치 |
GB0605824D0 (en) * | 2006-03-23 | 2006-05-03 | Frobisher Paul | Lighting & Sound Reproduction |
JP5528569B2 (ja) | 2009-12-02 | 2014-06-25 | フラウンホッファー−ゲゼルシャフト ツァ フェルダールング デァ アンゲヴァンテン フォアシュンク エー.ファオ | フラットスピーカ |
DE102012025313B3 (de) * | 2012-12-22 | 2014-02-20 | Audi Ag | Schallwandler zur Wandlung elektrischer Signale in Luftschall |
KR102420554B1 (ko) | 2017-08-10 | 2022-07-14 | 삼성디스플레이 주식회사 | 표시 패널, 브라켓 및 이를 포함하는 표시 장치 |
CN107979787B (zh) * | 2017-11-28 | 2020-01-21 | 东台鹏美电子实业有限公司 | 低音音箱 |
CN110972034B (zh) * | 2019-11-11 | 2021-05-18 | 歌尔股份有限公司 | 一种振膜及发声装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2713396A (en) * | 1950-05-24 | 1955-07-19 | Ernest A Tavares | Novel, small, extended low frequency response, loudspeaker enclosure |
DE3172790D1 (en) * | 1980-12-19 | 1985-12-05 | Nissan Motor | Speaker for automotive vehicle audio system |
JP2751190B2 (ja) * | 1988-03-25 | 1998-05-18 | ヤマハ株式会社 | 音響再生帯域拡大装置およびその方法 |
WO1997009849A1 (en) * | 1995-09-02 | 1997-03-13 | New Transducers Limited | Loudspeakers with panel-form acoustic radiating elements |
UA51671C2 (uk) * | 1995-09-02 | 2002-12-16 | Нью Транзд'Юсез Лімітед | Акустичний пристрій |
GB9806994D0 (en) * | 1998-04-02 | 1998-06-03 | New Transducers Ltd | Acoustic device |
GB9714050D0 (en) * | 1997-07-03 | 1997-09-10 | New Transducers Ltd | Panel-form loudspeakers |
US6496586B1 (en) * | 1998-01-07 | 2002-12-17 | New Transducers Limited | Thin Loudspeaker |
-
1999
- 1999-11-22 DE DE19955867A patent/DE19955867A1/de not_active Ceased
-
2000
- 2000-11-14 WO PCT/EP2000/011259 patent/WO2001039541A2/de active Search and Examination
- 2000-11-14 DE DE50009306T patent/DE50009306D1/de not_active Expired - Lifetime
- 2000-11-14 EP EP00979559A patent/EP1236375B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO0139541A2 * |
Also Published As
Publication number | Publication date |
---|---|
WO2001039541A2 (de) | 2001-05-31 |
DE19955867A1 (de) | 2001-06-21 |
EP1236375B1 (de) | 2005-01-19 |
DE50009306D1 (de) | 2005-02-24 |
WO2001039541A3 (de) | 2002-02-14 |
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