Electrodynamic sound transducers have long been known and have a diaphragm capable of vibrating, a vibrating coil coupled to the diaphragm and a magnet system cooperating with the vibrating coil. In that arrangement, the diaphragm and the vibrating coil form the element, which is capable of vibrating of the electrodynamic sound transducer.
In a conventional electrodynamic sound transducer the vibrating mass consisting of the diaphragm and the vibrating coil can prove to be a disadvantage.
On the German patent application from which priority is claimed the German Patent and Trade Mark Office searched the following documents: U.S. Pat. No. 6,636,612 B1 and EP 1 434 463 A2.
Aspects of the present invention concern an electrodynamic sound transducer.
Thus, an object of the present invention is to provide an electrodynamic sound transducer having a reduced vibrating mass.
That object can be attained by an electrodynamic sound transducer as described herein.
Thus, there is provided an electrodynamic sound transducer having a diaphragm capable of vibrating, and a vibrating coil coupled to the diaphragm and a magnet system. The magnet system has a first and a second magnet ring which are arranged above and below the diaphragm and are radially magnetized. The vibrating coil is arranged between the first and second magnet rings. The first magnet ring has an end having a projection, for example, in the form of a point or a round portion, which extends towards the diaphragm. In that way, the cross-section of the first and second magnet rings is adapted to the configuration or curvature of the diaphragm.
According to an aspect of the present invention, the magnetization direction of the first and second magnet rings is in the same direction.
According to a further aspect of the invention, the first magnet ring is arranged on a resonator above the diaphragm, and the second magnet ring is arranged on a chassis below the diaphragm.
In that way, the flux density and thus also the magnetic field can be increased.
According to a further aspect of the present invention, the point of the first magnet ring is adapted to the configuration of a coil seat of the diaphragm.
The electrodynamic sound transducer, according to aspects of the invention, has two radially magnetized magnet rings, between which is disposed the diaphragm having the vibrating coil. Optionally, the magnetization direction of the two rings can be in the same direction. Optionally, one of the rings can be fixed to a resonator above the coil. Optionally, the second ring can be fixed to a chassis below the coil. Optionally, the resonator arranged above the diaphragm can have a recess adapted to the shape of the diaphragm (in particular in the middle region, that is to say the dome).
With the electrodynamic sound transducer, according to aspects of the invention, a mechanically insensitive transducer system with a small vibrating mass is made possible. That makes it possible to achieve an improved transient performance on the part of the electrodynamic sound transducer. With the electrodynamic sound transducer according to aspects of the invention, it is possible to enjoy similar acoustic properties as in the case of a ribbon transducer, but with a mechanically robust structure. The diaphragm according to aspects of the invention, can be glued at the entire edge so that the front and rear sides of the transducer are sealed off relative to each other. It is also possible to implement a directional microphone with the electrodynamic sound transducer according to aspects of the invention.
Optionally, the vibrating coil has a plurality of turns which are mounted in mutually juxtaposed relationship on the diaphragm. The height of the coil can then determined based on the coil wire diameter.
Optionally, the conductor tracks can be produced by vapor deposition, printing or in the form of circuit board material.
Advantages and embodiments, by way of example of the invention, are described in greater detail hereinafter with reference to the drawings.
The diaphragm 110 can be fixed to the chassis 150 at the outer edge 111 of the diaphragm, for example by gluing. The vibrating coil 120 can be fixed to a coil seat 112 of the diaphragm. Optionally the diaphragm 110 can have a dome 113.
The magnet system 130 has a first and a second magnet ring 131, 132. The first magnet ring 131 can be fixed to the resonator 140, that is to say therefore above the diaphragm. The second magnet ring 132 can be fixed below the diaphragm, for example to the chassis 150.
The first and second magnet rings 131, 132 are radially magnetized. Optionally, the magnetization direction of the first and second magnet rings 131, 132 is in the same direction.
The coil has at least one turn. Optionally, a plurality of turns can be arranged in mutually juxtaposed relationship so that the height of the coil corresponds to the coil wire diameter. It should be noted however that other geometrical arrangements of the coil 120 are also possible to achieve a compromise between small mass and long conductor length, in which respect a large quantity of conductor affords greater sensitivity. Optionally, the height of the coil is limited so that the coil is rather of a flat configuration.
It will be seen from
The configuration of the ends 131a, 132a of the first and/or second magnet ring 131, 132 is adapted to the contour of the diaphragm 110 at that location (for example at the coil seat).
The ends 131a of the first magnet ring 131 are not flat but have for example a projection 131a (for example in the form of a point or a round portion) extending towards the diaphragm 110.
The ends 132a of the second magnet ring 132 can optionally also have a corresponding projection for reasons of symmetry.
The maximum deflection of the diaphragm is not influenced by the change in the cross-section of the first and second diaphragm magnet rings.
According to aspects of the invention, there is provided an electrodynamic sound transducer having a similar sensitivity as in the case of a ribbon microphone. The in part low sensitivity can be boosted for example by way of a transmitter or a low-noise circuit.
The sound transducer, according to aspects of the invention, can be used in an earphone or in a microphone.
The present application is a continuation of PCT Application No. PCT/EP2015/071411, filed Sep. 18, 2015, which claims priority to German Application No. 102014218986.1, filed Sep. 22, 2014, the disclosures of which are hereby incorporated by reference in their entirety for all purposes.
Number | Name | Date | Kind |
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6636612 | North et al. | Oct 2003 | B1 |
20020057819 | Czerwinski | May 2002 | A1 |
20040070294 | Hanada | Apr 2004 | A1 |
20070206830 | Usuki | Sep 2007 | A1 |
Number | Date | Country |
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20 2009 011485 | Jan 2010 | DE |
1434463 | Jun 2004 | EP |
1434463 | Nov 2008 | EP |
311486 | May 1929 | GB |
59216398 | Dec 1984 | JP |
2016046075 | Mar 2016 | WO |
Entry |
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Written Opinion for PCT/EP2015/071411 dated Dec. 11, 2015, 6 pages (non-English). |
First Notice Informing the Applicant of the Communication to the International Application (To Designated Offices Which Apply to the 30 month time Limit Under Article 22(1) for PCT/EP2015/071411 dated Sep. 18, 2015, 1 page. |
Second and Supplementary Notice Informing the Applicant of the Communication to the International Application (To Designated Offices Which Apply to the 30 month time Limit Under Article 22(1) for PCT/EP2015/071411 dated Jan. 26, 2017, 1 page. |
International Search Report for PCT/EP2015/071411 dated Dec. 11, 2015, 7 pages (non-English). |
Notification of Receipt of Record Copy for PCT/EP2015/071411 dated Sep. 29, 2015, 1 page. |
Notification Concerning Availability of the Publication of the International Application for for PCT/EP2015/071411 dated Mar. 31, 2016, 1 page. |
Number | Date | Country | |
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20170188156 A1 | Jun 2017 | US |
Number | Date | Country | |
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Parent | PCT/EP2015/071411 | Sep 2015 | US |
Child | 15456216 | US |