EP3837858A1 - Planar loudspeaker - Google Patents
Planar loudspeakerInfo
- Publication number
- EP3837858A1 EP3837858A1 EP19784003.6A EP19784003A EP3837858A1 EP 3837858 A1 EP3837858 A1 EP 3837858A1 EP 19784003 A EP19784003 A EP 19784003A EP 3837858 A1 EP3837858 A1 EP 3837858A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sound panel
- drive unit
- centering
- planar
- stabilizing
- 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.)
- Pending
Links
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
- H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
- H04R7/04—Plane diaphragms
-
- 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
-
- 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
- H04R7/24—Tensioning by means acting directly on free portions of diaphragm or cone
-
- 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
- H04R7/26—Damping by means acting directly on free portion of diaphragm or cone
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/041—Centering
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
- H04R9/04—Construction, mounting, or centering of coil
- H04R9/041—Centering
- H04R9/043—Inner suspension or damper, e.g. spider
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/15—Transducers incorporated in visual displaying devices, e.g. televisions, computer displays, laptops
Definitions
- the invention relates to a planar loudspeaker, comprising a flat sound panel and a drive unit for driving the sound panel.
- DE 10 2015 103 339 A1 discloses such a planar loudspeaker.
- DE 10 2015 103 339 A1 is also included or referred to, also with regard to the feasibility and / or complete disclosure.
- a so-called acoustic short circuit occurs, in which the waves emitted to the front and back cancel each other out.
- the short circuit must be prevented by means of housing measures.
- planar waves or planar parallel waves are predominantly generated in planar loudspeakers.
- the sound panel is stimulated flatly and homogeneously and in particular creates a flat wavefront. This largely eliminates the acoustic short circuit.
- the volume decreases significantly more slowly with planar waves than with spherical waves. There are also fewer reflections.
- planar loudspeakers also enable significantly flatter designs since no large-volume housings are required. Since no special tools are required for the production of planar loudspeakers, these are cheaper.
- a sound panel of a planar loudspeaker is conventionally fastened to a support frame by means of an elastic holding element which runs in a channel-like manner at the edge of the sound panel. This limits the freedom of movement of the sound panel, which worsens the acoustic result.
- the loudspeaker according to the invention is designed as a planar loudspeaker.
- planar loudspeakers In contrast to funnel-shaped and / or cone-shaped loudspeakers, planar loudspeakers have a flat shape.
- planar loudspeaker has no loudspeaker basket and / or a carrier frame.
- A, for example rigid, attachment to the outer edge is in particular not necessary.
- the shape is necessary.
- only an arbitrarily shaped recess is made in the front.
- the sound panel which is set in vibration, is flat, in particular flat and / or plate-shaped.
- planar speaker can e.g. to be attached to a wall like a picture or flat screen.
- the sound panel can be designed as a flat membrane.
- the planar loudspeaker can be a flat membrane loudspeaker.
- the sound panel can also replace a membrane.
- the sound panel can be designed to be particularly rigid.
- the sound panel preferably consists of a light material or a composite material.
- the sound panel can be designed as a “carbon sandwich”.
- a RohacelKD material can be bonded with carbon, in particular baked.
- the planar speaker has a bracket.
- the sound panel can be connected to the holder, preferably indirectly.
- the sound panel can be e.g. can be attached to a wall or stand.
- a support frame for the sound panel is not necessary, but is nevertheless conceivable.
- the holder can be made in one piece or in several pieces.
- the planar loudspeaker comprises at least one drive unit for driving the sound panel.
- the drive unit is preferably attached to the holder.
- the drive unit is in particular designed to set the sound panel into vibrations for sound generation.
- the drive unit is preferably designed as an electrodynamic drive.
- a current through conductors e.g. a wire to be held in a magnetic field.
- a force is exerted on the sound panel connected to the drive unit.
- the planar loudspeaker comprises at least one stabilization device, which does not surround the drive unit, for stabilizing a movement of the sound panel.
- the stabilization device surrounds the round, three-dimensional drive unit.
- the drive unit acts on the membrane in a punctiform manner.
- the stabilizing device surrounds the drive unit and ensures that the membrane is returned to the rest position.
- the sound can change due to the stabilization device.
- This also applies to conventional planar loudspeakers, in which the stabilizing device is arranged on the edge of the sound panel and in this way likewise surrounds the drive unit.
- the drive unit is not surrounded by the stabilization device, an additional stabilization device on the edge being possible in principle.
- the stabilization device is preferably spaced from the edge.
- the drive unit and the stabilization device are spaced apart from one another.
- the sound panel can thus be stabilized with only very little influence on the sound.
- a stabilizing device arranged in this way fulfills a double function and, in addition to stabilizing or fastening the sound panel, also centers the drive unit.
- the stabilization device ensures in particular that only the desired piston movements are permitted and all other movements such as tilting, horizontal displacement and / or axial twists can be prevented.
- a coil e.g. Magnetic field coil and / or voice coil
- the drive unit is in particular automatically centered by the stabilizing device. This prevents axial, vertical and / or horizontal rotation of the coil.
- the upper and lower edges of the coil carrier run parallel to the edges of the magnets and thus in the desired manner in the magnetic field, in particular during the entire movement sequence.
- the stabilization device is arranged between the sound panel and the holder and has at least one lifting section which is designed to be movable, flexible and / or elastic.
- the elastic modulus can be less than 20 GPa, 15 GPa, 10 GPa, 5 GPa, 1 GPa or 0.1 GPa.
- the lifting section can perform a lifting movement between 1 mm and 10 mm, preferably between 4 mm and 6 mm.
- the stabilizing device can be attached to the sound panel and / or the holder, in particular using an adhesive.
- the sound section is dynamically fixed to the bracket by the lifting section.
- the sound panel can, in particular, only perform the desired piston movement.
- the planar loudspeaker comprises at least one centering device, which does not surround the drive unit, for centering the sound panel and / or at least part of the drive unit, in particular a plate-shaped coil carrier.
- a voice coil can preferably be centered between bar magnets.
- the centering device is arranged on a different plane than the stabilizing device.
- the centering device also has a lifting section which is designed to be movable, flexible and / or elastic.
- the elastic modulus can be less than 20 GPa, 15 GPa, 10 GPa, 5 GPa, 1 GPa or 0.1 GPa.
- the lifting section can perform a lifting movement between 1 mm and 10 mm, preferably between 4 mm and 6 mm.
- the centering device can be attached to the sound panel and / or the holder, in particular by means of an adhesive.
- the sound panel is dynamically fixed to the bracket by the lifting section.
- the sound panel can, in particular, only perform the desired piston movement.
- the centering device can in particular be constructed identically to the stabilizing device. However, these are preferably designed differently.
- the stabilizing device can be designed as a pot spider.
- the stabilizing device preferably has a larger diameter than the centering device.
- the centering device and the stabilizing device can in particular be arranged coaxially and / or concentrically to one another. All in all, a spider that is linearly effective in the stroke direction results.
- the centering device and the stabilizing device can in particular move in opposite directions relative to one another.
- the centering device and the stabilizing device can also be arranged at different locations and consequently not above one another.
- a triangular arrangement of the centering device (s) and the stabilizing device (s) is conceivable.
- the stabilizing device can in particular be movably connected to the sound panel, while the centering device can be movably attached to the holder.
- the stabilizing device and the centering device are thereby firmly fixed on one side.
- the stabilization device can preferably have a stabilization holder. This can e.g. be centrally connected to the lifting section.
- the stabilization bracket can be rigid, for example as a tube.
- the stabilization bracket can be firmly attached to the bracket, for example glued. Only the section of the stabilization device facing the sound panel is therefore movable.
- the centering device can preferably have a centering bracket. This can, for example, be connected centrally to the lifting section.
- the centering bracket can be rigid, for example as a tube.
- the centering bracket can be firmly attached to the sound panel, e.g. glued, be. Therefore only the section of the centering device facing the holder is movable.
- the diameter of the centering bracket is preferably smaller than the diameter of the stabilizing bracket.
- the centering bracket can be arranged within the stabilizing bracket.
- This arrangement in different levels stabilizes the planar speaker.
- the sound panel and / or the drive unit is thereby guided, stabilized and / or centered. Nevertheless, a piston-like stroke movement is made possible.
- the drive unit has a plate-shaped coil carrier with a coil formed thereon and a magnet device, the coil carrier being arranged in a gap between two magnet units of the magnet device.
- the voice coil moves in particular between two bar magnets, e.g. Neodymium magnets.
- the coil carrier can be moved in a direction perpendicular to a connecting straight line between the two magnet units, in particular as a function of the electromagnetic interaction between the coil and the magnet device.
- the coil is wound in such a way that it extends at least substantially along a plane oriented parallel to a direction of movement.
- coil layers can be provided.
- the coil layers can in particular be arranged parallel to one another.
- at least or exactly two, three, four, five, six or more drive units are provided.
- the sound panel is driven in parallel by two linear drives.
- the drives act flat, that is not point-like. In particular, this can prevent the development of bending waves.
- the drive units can preferably be fastened to the same holder, wherein different holders are also possible.
- the stabilization device is arranged between the drive units.
- the stabilization device is arranged centrally on the sound panel.
- exactly one stabilization device can be provided.
- a plurality of stabilizing devices are distributed over the sound panel and in particular arranged at four corner areas of the sound panel.
- the sound panel is supported evenly, which increases stability.
- a central stabilization device can also be provided.
- the lifting section of the stabilizing device and / or the centering device comprises or consists of a rubber, foam and / or fabric material.
- a lifting movement can be performed and / or limited.
- the lifting movement can e.g. be guided and / or limited by means of a spring device.
- the lifting section of the stabilizing device and / or the centering device has a, in particular central, recess.
- the lifting section can also be closed and e.g. have a bottom or lid.
- the lifting section can in particular be attached, for example glued, to the sound panel or the holder at the edge of the recess.
- the lifting section is annular.
- a recess in the lifting section can also be annular.
- ring is to be understood broadly. In addition to circular shapes, oval shapes are also included. Alternatively, an angular configuration of the lifting section is also conceivable.
- the lifting section comprises or consists of a bead and / or spider.
- a spider which is also called a centering spider, can e.g. be designed as a radial and / or concentric spring element, for example a bidirectional disc spring.
- two oppositely oriented and interconnected spiders can also be provided, which form the lifting section.
- the stabilization device comprises at least one retaining ring.
- a preferably annular lifting section can be attached to the retaining ring.
- the lifting section is preferably arranged coaxially and / or concentrically on the retaining ring.
- the retaining ring can also be solid, for example in the form of a puck or a disk.
- the lifting section in particular a bead, can be arranged, for example, between the holding ring and the sound panel or between the holding ring and the holder.
- the stabilizing device comprises two retaining rings, which preferably have different diameters, the lifting section, in particular a bead, being arranged between the retaining rings.
- the retaining ring with a smaller diameter can be connected to the sound panel and the retaining ring with the larger diameter can be connected to the holder.
- the reverse orientation is also conceivable. So the retaining ring with the smaller diameter with the bracket and the retaining ring with the larger diameter in connection with the sound panel.
- the retaining rings can be moved into one another in a telescopic manner.
- the lifting section connects the retaining rings to one another.
- the lifting section can be glued to the retaining rings.
- At least one holding element which does not completely surround the sound panel, is provided on the sound panel.
- the holding element is designed to fasten the sound panel to a support frame. In particular, centering and / or stabilization can thereby be achieved.
- the sound panel is preferably not fully connected or connectable to a support frame via the holding element.
- air can flow out between the sound panel and the support frame, whereby e.g. an acoustic curtain is avoided.
- a sealed, closed housing is not necessary for planar loudspeakers - in contrast to funnel-shaped or conical loudspeakers - since there is only a slight risk of acoustic short circuits.
- the holding element is preferably elastic. In particular, this enables a relative movement between the sound panel and the support frame.
- the holding element can for example comprise or consist of a plastic, rubber, foam, fabric, textile and / or paper material.
- the holding element can be U-shaped. With a piston-like movement of the sound panel, it can roll to a certain extent.
- One leg of the holding element can be connected to the sound panel, e.g. glued, while the other leg is connected to the support frame, e.g. glued, can be.
- the sound panel can preferably have several, for example two, three, four, five, six, seven, eight or more, holding elements.
- the holding elements can in particular different, for example opposite, sides of the sound panel.
- two holding elements face each other. A spring force that arises laterally cancels out in this way.
- the invention also relates to a method for producing a planar loudspeaker.
- a stabilizing device which has at least one movable, flexible and / or elastic lifting section, is arranged for stabilizing a flat sound panel between the sound panel and a holder.
- the stabilization device does not surround a drive unit for driving the sound panel.
- the stabilizing device is spaced from the drive unit.
- the stabilizing device can in particular be fastened to the holder and / or the sound panel by means of a hanging, Velcro, clip, clamp, plug-in, latching, magnetic, peg and / or screw device.
- permanent connections are also conceivable, for example adhesive, rivet, soldered and / or welded connections.
- a section of the stabilization device facing the holder is preferably glued to the holder.
- a section of the stabilization device facing the sound panel is glued to the sound panel.
- a lifting section can be glued to the holder or a holding ring on an underside and to the sound panel or a holding ring on an upper side.
- the sound panel is thus indirectly attached to the bracket via the stabilization device. Because the stabilizing device has a lifting section, the sound panel is fixed dynamically and not rigidly.
- a centering device which has at least one movable, flexible and / or elastic lifting section, is arranged for centering the sound panel and / or at least part of the drive unit in a different plane than the stabilizing device.
- the centering device does not surround the drive unit for driving the sound panel.
- the centering device is spaced from the drive unit.
- the centering device can in particular be fastened to the holder and / or the sound panel by means of a hanging, Velcro, clip, clamp, plug-in, latching, magnetic, peg and / or screw device.
- permanent connections are also conceivable, for example adhesive, rivet, soldered and / or welded connections.
- a section of the centering device facing the sound panel, in particular a centering bracket, is preferably glued to the sound panel.
- a section of the centering device facing the holder is glued to the holder.
- a lifting section can be glued to the holder on an underside.
- the sound panel is thus indirectly attached to the bracket via the centering device. Because the centering device has a lifting section, the sound panel is fixed dynamically and not rigidly.
- Fig. 1 is a bottom perspective view of an embodiment
- planar speaker 2 is a top perspective view of an embodiment of a planar speaker
- Fig. 3 is a side view of an embodiment of a
- Fig. 4 is a bottom perspective view of another
- FIG. 5 is a sectional perspective view of an embodiment of a stabilizing device of a planar speaker
- Fig. 6 is a plan view of another embodiment of a
- Fig. 7 is a sectional perspective view of another
- Fig. 8 is a sectional view of an embodiment of a
- Fig. 9 is a sectional perspective view of another
- Fig. 10 is a sectional perspective view of another
- FIG. 1 1 is a top perspective view of an embodiment of a planar loudspeaker according to the invention
- Fig. 12 is a top perspective view of another
- FIG. 13 is a top perspective view of another
- the holder 12 can have a plurality of individual parts connected, in particular screwed, to one another. Alternatively, the holder 12 can also be formed in one piece.
- Two drive units 14 are fastened, in particular screwed, to the holder 12.
- the drive units 14 each comprise a magnet device 16 with two magnet units 18 and a plate-shaped coil carrier 20 arranged in a gap therebetween.
- a stabilization device 22 is arranged between the drive units 14.
- the stabilization device 22 extends between the sound panel 10 and the holder 12.
- the stabilization device 22 comprises a first retaining ring 24 and a second retaining ring 26.
- the first retaining ring 24 has a smaller diameter than the second retaining ring 26 on.
- a lifting section designed as a bead 28 is provided between the retaining rings 24, 26.
- the retaining rings 24, 26 are provided between the retaining rings 24, 26.
- the stabilization device 22 can thus simulate the movement of the sound panel 10, which is driven in particular synchronously by the drive units 14.
- the stabilization device 22 is formed by a spider 30. Retaining rings are not necessary.
- the spider 30 is designed as a kind of concentric spring.
- the spider 30 can in particular have a central recess or else be closed.
- the spiders 30 can also be used together.
- the spiders 30 can be oriented oppositely, coaxially one above the other. The travel is extended.
- four stabilization devices 22 are provided instead of a central stabilization device. These are arranged at the corner areas of the sound panel 10.
- FIG. 7 shows a sound panel 10, which is connected to a support frame 34 via holding elements 32.
- the holding elements 32 are comparatively narrow and do not extend over the entire circumference of the sound panel 10.
- the holding elements 32 are in particular narrower than the distance between two holding elements 32.
- the holding elements 32 can in particular be distributed uniformly on the sound panel 10. At least one holding element 32 is preferably provided on each side of the sound panel 10. The sound panel 10 can thus be stabilized and / or centered on each side.
- the holding elements 32 are preferably elastic. In particular, this enables a relative movement between the sound panel 10 and the support frame 34.
- the holding element 32 can have a wavy section. This allows a certain game.
- One leg of the holding element 32 can be connected to the sound panel 10, while the other leg can be connected to the support frame 34.
- the holding element 32 can also be U-shaped.
- the legs of the U-shaped holding element 23 can in particular be oriented parallel to the support frame 34.
- the holding element 23 can virtually unroll when the sound panel 10 is moved.
- the apex can increase or decrease in particular.
- the legs of the U-shaped holding element 23 can in particular be oriented parallel to the sound panel 10.
- the holding element 23 can virtually unroll when the sound panel 10 is moved.
- Fig. 1 1 shows a planar speaker with a central stabilizing device 22 and a plurality of centering devices 36.
- the centering devices 36 are arranged above the stabilizing device 22 and consequently in another plane.
- a centering device 36 is arranged coaxially with the stabilizing device 22.
- stabilizing devices 22 can also be provided. For example, one can be found in each corner area Stabilizing device 22 may be arranged.
- a centering device 36 can be located directly above it, for example.
- a centering device 36 is arranged coaxially above a stabilizing device 22.
- the centering device 36 and the stabilizing device 22 can in particular move in opposite directions relative to one another.
- the stabilizing device 22 is movably connected to the sound panel 10, while the centering device 36 can be movably attached to the holder 12 by means of a holding means 38.
- the stabilization device 22 can preferably have a stabilization holder designed as a stabilization tube 40.
- Stabilization bracket 40 is fixedly attached to bracket 12, e.g. glued.
- the centering device 36 has a centering bracket designed as a centering tube 42.
- the centering tube 42 can be hollow or solid.
- the centering bracket 42 is fixedly attached to the sound panel 10, e.g. glued.
- the diameter of the centering bracket 42 is preferably smaller than the diameter of the stabilizing bracket 40.
- the centering bracket 42 is arranged within the stabilizing bracket 40.
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Multimedia (AREA)
- Manufacturing & Machinery (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102018124261.1A DE102018124261B4 (en) | 2018-10-01 | 2018-10-01 | Planar speakers |
PCT/EP2019/076395 WO2020070046A1 (en) | 2018-10-01 | 2019-09-30 | Planar loudspeaker |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3837858A1 true EP3837858A1 (en) | 2021-06-23 |
Family
ID=68172176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19784003.6A Pending EP3837858A1 (en) | 2018-10-01 | 2019-09-30 | Planar loudspeaker |
Country Status (4)
Country | Link |
---|---|
US (1) | US11388517B2 (en) |
EP (1) | EP3837858A1 (en) |
DE (1) | DE102018124261B4 (en) |
WO (1) | WO2020070046A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102020112950A1 (en) | 2020-05-13 | 2021-11-18 | Grawe & Schneider GdbR (vertretungsberechtigte Gesellschafter: Thomas Grawe, 83088 Kiefersfelden und Gerd-Peter Schneider, 84032 Landshut) | Kitchen sink |
Family Cites Families (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB312756A (en) | 1928-04-13 | 1929-06-06 | Cyril John Nesbitt Dufort | Improvements in and relating to electrically operated loud speakers |
JPS5474417A (en) | 1977-11-26 | 1979-06-14 | Sony Corp | Multi-point driving type speaker |
JPS5718200A (en) * | 1980-07-09 | 1982-01-29 | Hitachi Ltd | Plane type loudspeaker |
NO169210C (en) | 1989-07-06 | 1992-05-20 | Nha As | ELECTRODYNAMIC AUDIO FOR HEARING DEVICE. |
CA2147684C (en) * | 1994-04-25 | 1998-12-08 | Akihiro Furuta | Loudspeaker |
TW507465B (en) | 2000-12-28 | 2002-10-21 | Tai-Yan Kam | Transparent planar speaker |
US6714655B2 (en) | 2001-05-11 | 2004-03-30 | Matsushita Electric Industrial Co., Ltd. | Speaker |
EP1410680B1 (en) | 2001-07-13 | 2010-12-15 | Harman Becker Automotive Systems GmbH | Planar loudspeaker |
JP3915448B2 (en) * | 2001-07-30 | 2007-05-16 | 日本ビクター株式会社 | Electroacoustic transducer |
US6804368B2 (en) | 2002-04-11 | 2004-10-12 | Ferrotec Corporation | Micro-speaker and method for assembling a micro-speaker |
US7333620B2 (en) | 2003-04-09 | 2008-02-19 | Harman International Industries, Incorporated | Acoustic transducer with mechanical balancing |
DE102007003165A1 (en) * | 2007-01-22 | 2008-07-24 | Siemens Ag | Area loudspeaker and method for adjusting the vibration behavior of a vibration system |
JP4534173B2 (en) * | 2008-04-15 | 2010-09-01 | ソニー株式会社 | Speaker, voice coil unit and manufacturing method thereof |
DE102009040982A1 (en) | 2009-09-09 | 2011-03-10 | CICADA Technologies GbR (Vertretungsberechtigter Gesellschafter: Andreas Müller, 10825 Berlin) | Acoustic transducer and method for generating and / or receiving sound waves, movable member for an acoustic transducer and arrangement for moving a movable member of an acoustic transducer |
DE102011005292A1 (en) | 2011-03-09 | 2012-09-13 | Opitz Müller und Partner GbR (Vertretungsberechtigter Gesellschafter: Norbert Opitz, 10713 Berlin) | Acoustic transducer for generating and receiving sound waves, has converting device, which is arranged for converting electrical signal into movement of movable element along moving direction |
DE102014201693B3 (en) * | 2014-01-30 | 2015-06-25 | Kendrion Kuhnke Automation Gmbh | Electric vibrator |
DE102015103339A1 (en) | 2015-03-06 | 2016-09-08 | LEGIS GbR (vertretungsberechtigter Gesellschafter: Thomas C.O. Schmidt, 10707 Berlin) | Planar speaker with double-sided ferrofluid storage of a voice coil of a drive unit and acoustic unit with such a planar loudspeaker |
DE202015101126U1 (en) * | 2015-03-06 | 2016-06-08 | LEGIS GbR (vertretungsberechtigter Gesellschafter: Thomas C.O. Schmidt, 10707 Berlin) | Planar speaker with double-sided ferrofluid storage of a voice coil of a drive unit and acoustic unit with such a planar loudspeaker |
-
2018
- 2018-10-01 DE DE102018124261.1A patent/DE102018124261B4/en active Active
-
2019
- 2019-09-30 US US17/282,116 patent/US11388517B2/en active Active
- 2019-09-30 EP EP19784003.6A patent/EP3837858A1/en active Pending
- 2019-09-30 WO PCT/EP2019/076395 patent/WO2020070046A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
US11388517B2 (en) | 2022-07-12 |
US20210377664A1 (en) | 2021-12-02 |
DE102018124261A1 (en) | 2020-04-02 |
DE102018124261B4 (en) | 2020-06-04 |
WO2020070046A1 (en) | 2020-04-09 |
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