DE102016108598A1 - Planar dynamic transducer - Google Patents

Planar dynamic transducer

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Publication number
DE102016108598A1
DE102016108598A1 DE102016108598.7A DE102016108598A DE102016108598A1 DE 102016108598 A1 DE102016108598 A1 DE 102016108598A1 DE 102016108598 A DE102016108598 A DE 102016108598A DE 102016108598 A1 DE102016108598 A1 DE 102016108598A1
Authority
DE
Germany
Prior art keywords
membrane
magnet
dynamic transducer
magnet units
planar dynamic
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
Application number
DE102016108598.7A
Other languages
German (de)
Inventor
André Michaelis
Roland Jacques
Axel Grell
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sennheiser electronic GmbH and Co KG
Original Assignee
Sennheiser electronic GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sennheiser electronic GmbH and Co KG filed Critical Sennheiser electronic GmbH and Co KG
Priority to DE102016108598.7A priority Critical patent/DE102016108598A1/en
Publication of DE102016108598A1 publication Critical patent/DE102016108598A1/en
Application status is Pending legal-status Critical

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/04Construction, mounting, or centering of coil
    • H04R9/046Construction
    • H04R9/047Construction in which the windings of the moving coil lay in the same plane
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00Diaphragms for electromechanical transducers; Cones
    • H04R7/02Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/04Plane diaphragms
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/06Loudspeakers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/08Microphones
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/025Magnetic circuit

Abstract

According to one aspect of the present invention, a planar dynamic transducer with a vibratable diaphragm (500), tracks (600) on the diaphragm (500) and a magnet assembly (400) is provided. The magnet assembly (400) has a plurality of magnet units (400) having first ends facing the diaphragm (500). These first ends are not parallel to the membrane.

Description

  • The present invention relates to a planar dynamic sound transducer.
  • Planardynamic transducers are also referred to as planar magnetic, orthodynamic, isodynamic or magnetostatic transducers. The planar dynamic transducer is one of the dynamic, electromagnetic sound transducers. A planar dynamic sound transducer according to the prior art comprises a planar multi-pole magnet arrangement, a membrane and a second mirrored multipolar magnet arrangement. The multipole magnet assembly may provide parallel magnetic bars with spaces therebetween. The magnetization of the magnetic bars may be in the direction of the short dimension. The two magnet assemblies repel, with the result that they should be assembled in a suitably designed construction. Thus arise strip-shaped magnetic fields, wherein the magnetization direction is alternating and in particular in the direction of the short dimension of the strip.
  • Planard dynamic transducers can be used in both speakers and microphones. A planar dynamic transducer has a magnetic drive consisting of opposing plates, discs or rectangular bars. Between two opposite magnet arrangements, a membrane is provided with conductor tracks.
  • The membrane between the two magnet arrangements is a flat membrane consisting of a thin plastic film or a polyester film. On the membrane electrical conductors are provided. The electrical conductors can be configured for example in the form of a thin wire or a vapor-deposited conductor track. The position and direction of the electrical conductors are aligned with the magnetic poles of the two magnet assemblies. The conductors can be configured meandering.
  • It is therefore an object of the present invention to provide an improved sound dynamic transducer.
  • This object is achieved by a sound-dynamic transducer according to claim 1.
  • According to one aspect of the present invention, a planar dynamic transducer is provided with a vibratable membrane, tracks on the membranes and a magnet assembly. The magnet assembly has a plurality of magnet units having first ends facing the diaphragm. These first ends are not parallel to the membrane.
  • The first ends may thus be round, semicircular, oval, elliptical, or drop-shaped. Thus, a planar dynamic transducer can be obtained, which allows a more even or more planar drive for the membrane.
  • Furthermore, the inventive design of the magnetic drive leads to improved acoustic properties, because the sound emitted by the membrane does not strike a straight surface, which is aligned parallel to the membrane. Thus, the magnetic drive disturbs the vibrational behavior of the membrane only to a very reduced extent.
  • According to one aspect of the present invention, there is provided a planar dynamic transducer having a diaphragm, tracks on the diaphragm, and a magnet assembly. The magnet arrangement has a plurality of magnet units which, on their side facing the membrane, do not have a straight surface but only a curved, kinked, angled or round surface. This leads according to the invention to the fact that the vertices of the magnet units can be positioned closer to the membrane without acoustically attenuating the membrane and influencing its vibration behavior. Furthermore, the inventive design of the magnet units (round or aerodynamically shaped rods) leads to acoustic advantages, since the membrane movement and the acoustic flow are less affected or impaired.
  • Further embodiments of the invention are the subject of the dependent claims.
  • Advantages and embodiments of the invention are explained below with reference to the drawing.
  • 1 shows a schematic sectional view of a planar dynamic transducer according to the prior art,
  • 2 shows the plan view of a planar dynamic transducer according to the prior art,
  • 3A shows a schematic representation of a planar dynamic transducer according to the prior art,
  • 3B . 3C each show a graph illustrating a magnetic flux in a planar dynamic transducer according to 3A .
  • 4A shows a schematic representation of a planar dynamic transducer according to the invention, and
  • 4B . 4C each show a graph illustrating a magnetic flux in a planar dynamic transducer according to 4A ,
  • 1 shows a schematic sectional view of a planar dynamic transducer according to the prior art. The planar dynamic converter 100 has a vibratable membrane 110 with electrical conductors 130 on. The electrical conductors 130 can be configured meandering. The membrane 110 can be configured as a membrane film. The converter 100 further includes a first and second magnet arrangement 120 . 140 on, wherein the first magnet arrangement 120 above the membrane 110 and the second magnet arrangement 140 below the membrane 110 is provided. The first membrane arrangement 120 has a plurality of magnetic rods 121 - 122 on. The magnetic bars 121 - 122 have first and second magnetic bars 121 . 122 which alternate and each have a different magnetization direction. The same applies to the magnetic bars 141 . 142 the second magnet arrangement 140 ,
  • In 1 are magnetic field lines FL as well as one on the membrane 110 resulting power 101 shown.
  • 2 shows a plan view of a planar dynamic transducer according to the prior art. The planar dynamic converter 100 has a membrane 110 with a membrane edge 111 and a movable oscillating surface 112 on. The planar dynamic converter 100 further comprises a plurality of first and second magnetic bars 121 . 122 the first magnet arrangement 120 as well as first and second magnetic bars 141 . 142 the second magnet arrangement 140 on. In the top view of 2 is the second magnet arrangement 140 not to be seen; (it lies under the membrane 110 ). On the membrane 110 is a meandering track 130 with a positive connection 131 and a negative connection 132 intended. The conductor track 130 is in 2 shown in dashed lines. In the top view of 2 are the first and second magnetic bars 121 . 122 the first magnet arrangement 120 above the membrane 110 intended.
  • The membrane 110 has a movable area 112 and a fixed area 111 on which serves the membrane 110 to attach to a chassis of a transducer. The magnetic bars are in the moving area 112 the membrane 110 intended. At the respective ends of the magnetic bars 120 as well as at the edge areas can a stray field 200 arise. The invention relates to the idea that in the field of stray field 200 no linear sound conversion is possible.
  • 3A shows a schematic representation of a planar dynamic transducer according to the prior art and in particular the course of the forming between the magnet field. A magnet arrangement 310 has a plurality of magnetic rods 311 on both sides of a membrane 320 on. On the membrane are tracks 330 intended. The tracks 330 essentially extend between adjacent magnetic bars 311 , The adjacent magnetic bars are oppositely polarized. This forms between the magnetic rods 311 a magnetic field 350 , The tracks 330 become centered between the adjacent magnetic bars 311 positioned. Preferably, the conductor tracks 330 in the places with the strongest and most uniform magnetic field 350 intended. Due to the magnetic field formation, it can lead to a deflection 340 the membrane 320 come. In 3A The magnetic bars have a square cross-section.
  • 3B shows a graph illustrating the magnetic flux B over the length L of the membrane of 3A , by the rectangular configuration of the membrane rods 311 It can come in the peripheral areas of the magnetic bars to increases in field strengths. Thus, the magnetic field between adjacent magnetic bars is not uniform.
  • 3C shows another graph illustrating the magnetic flux over the length of the membrane. In 3C In particular, the situation is shown with a growing deflection of the membrane. The elevations of the field strengths at the ends of the magnetic bars is even more prominent or higher.
  • With a suitable arrangement and by appropriate shaping of the magnets, it is possible to attach them only on one side of the membrane. This should be based 1 be explained. The magnetic field is then either only through the magnet arrangement 120 (above the membrane) or through the magnet assembly 140 generated (below the membrane). The other magnet arrangement ( 140 or 120 ) then deleted. This makes it possible to build extremely flat transducer systems. Although the resultant magnetic field is then less homogeneous in the region of large diaphragm deflection, it is nevertheless sufficiently homogeneous for small diaphragm deflections (not too high volume) to produce a clean listening impression. Such a magnet arrangement on only one side is the subject of claim 2.
  • 4A shows a schematic representation of a planar dynamic transducer according to the invention. The dynamic transducer has a (currently) vibratable membrane 500 with a plurality of electrical conductors 600 on. Furthermore, the planar dynamic transducer has a magnet arrangement 400 on. The magnet arrangement 400 has a plurality of magnet units 410 on, with the membrane 500 between the magnet units 410 is arranged. Thus, first magnet units are above and second magnet units 410 below the membrane 500 arranged. Opposite first and second magnet units are oppositely magnetized, so that the same direction magnetic poles face each other. Adjacent magnet units are also oppositely magnetized. The magnet units 410 have first ends 411 on which of the membrane 500 are facing. The magnet units have second ends 412 on, which are remote from the membrane
  • The first ends 411 the magnet units 410 have a configuration which is not parallel to the straight membrane 500 are designed. For example, the first ends 411 the magnet units 410 arched, kinked, angled or rounded be configured.
  • Optionally, the magnet units 410 be designed as magnetic rods, which have a round, semicircular, oval, elliptical or teardrop-shaped cross-section.
  • 4A and 4B each show a graph illustrating a magnetic flux over the length of the membrane. Due to the non-parallel configuration of the first ends 411 the magnetic bars 410 According to the invention, an increase in the field strengths at the corners of the magnetic bars can be avoided. This is the course of the magnetic flux between adjacent magnet units 410 much more uniform than in the prior art. In 4C is shown a situation with a greater deflection of the membrane. Again, the planar dynamic transducer according to the invention leads to a more uniform distribution of the magnetic flux in the region between adjacent magnet units.
  • Due to the curvature of the magnet units 410 opposite the membrane 500 This results in more uniform magnetic field lines, resulting in a wider and more uniform drive field. The strong concentration of magnetic field lines at the edges of the magnetic bars according to the prior art (see 3A ) can thus be significantly reduced. Thus, a broader and more homogeneous magnetic field in the drive range is achieved with the planar dynamic transducer according to the invention. This is also advantageous because hereby the width 610 the tracks 600 can be increased. This can lead to a reduction of the drive fluctuations in deflection of the membrane.
  • Furthermore, as a result of the design of the magnet unit according to the invention, the magnet units can be guided closer to the membrane without this leading to the magnet units acoustically damping the membrane surface. The arched, or rounded configuration of the first ends of the magnet units can also improve the acoustic transmission, because there are fewer acoustic reflections on the lateral surfaces of the magnetic bars according to the prior art.
  • According to one aspect of the present invention, the magnet units may be configured as circular segments or as diagonally positioned rods. It is important only that the first ends (the ends facing the membrane) are not parallel to the membrane 500 are designed.
  • The planar dynamic transducer can be used in a handset or in a microphone.

Claims (7)

  1. Planard dynamic transducer, with a diaphragm ( 500 ) with a plurality of electrical conductors ( 600 ), and a magnet arrangement ( 400 ) comprising a plurality of magnet units ( 410 ), wherein first magnet units ( 410 ) above the membrane ( 500 ) and / or second magnet units ( 410 ) below the membrane ( 500 ) are provided, wherein first ends ( 411 ) of the magnet units ( 410 ) each of the membrane ( 500 ) and not parallel to the membrane ( 500 ) are configured.
  2. A planar dynamic transducer according to claim 1, wherein the plurality of magnet units ( 410 ) exclusively on one side of the membrane ( 500 ) are provided.
  3. Planar dynamic transducer according to claim 1 or 2, wherein the first ends ( 411 ) of the magnet units ( 410 ) are not straight.
  4. Planar dynamic transducer according to claim 1 to 3, wherein the first ends ( 411 ) of the magnet units ( 410 ) arched, kinked, angled or rounded are designed.
  5. Planar dynamic transducer according to one of claims 1 to 4, wherein the magnet units ( 410 ) have a round, semicircular, oval, elliptical, or drop-shaped cross-section.
  6. Microphone, with a planar dynamic transducer according to one of claims 1 to 5.
  7. Handset, with a planar dynamic transducer according to one of claims 1 to 6.
DE102016108598.7A 2016-05-10 2016-05-10 Planar dynamic transducer Pending DE102016108598A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102016108598.7A DE102016108598A1 (en) 2016-05-10 2016-05-10 Planar dynamic transducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102016108598.7A DE102016108598A1 (en) 2016-05-10 2016-05-10 Planar dynamic transducer

Publications (1)

Publication Number Publication Date
DE102016108598A1 true DE102016108598A1 (en) 2017-11-16

Family

ID=60163064

Family Applications (1)

Application Number Title Priority Date Filing Date
DE102016108598.7A Pending DE102016108598A1 (en) 2016-05-10 2016-05-10 Planar dynamic transducer

Country Status (1)

Country Link
DE (1) DE102016108598A1 (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer
US20040008858A1 (en) * 2002-05-02 2004-01-15 Steere John F. Acoustically enhanced electro-dynamic loudspeakers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer
US20040008858A1 (en) * 2002-05-02 2004-01-15 Steere John F. Acoustically enhanced electro-dynamic loudspeakers

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