JP2008131373A - Electromagnetic transducer and speaker device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enlarge a sound radiation area while reducing a projection area at a listening front side. <P>SOLUTION: Electromagnetic transducers 11, 12, 13 and 14 have a circle diaphragm 23 having a meander coil pattern, circle permanent magnetic boards 25 and 21 having band-shaped multi-pole magnetic patterns which are arranged in front of and back of the diaphragm 23, circle shock absorbers 24 and 22 which are arranged between the diaphragm 23 and the permanent magnetic board 25 and between the diaphragm 23 and the permanent magnetic board 21, and circle support members 42 and 41 which support the diaphragm 23, the permanent magnetic boards 25 and 21, and the shock absorbers 24 and 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electromagnetic transducer for reproducing an audio signal, for example, and a speaker device using the electromagnetic transducer.

  Various techniques have been proposed for electromagnetic transducers combining a permanent magnet and a vibrating membrane. For example, as shown in Patent Document 1, this type of electromagnetic transducer is usually a permanent magnet plate, a vibration film disposed so as to face the permanent magnet plate, and between the permanent magnet plate and the vibration film. And a buffer member disposed. Permanent magnets are formed by alternately forming different belt-shaped magnetic poles at regular intervals. In addition, a coil made of a meandering conductor pattern is formed on the entire surface of the vibrating membrane at a position facing a so-called neutral zone of so-called magnetization in a gap portion between different magnetic poles of the permanent magnet plate.

  Thus, when a current (audio signal) flows through the coil of the diaphragm, the coil and the multipolar magnetization pattern of the permanent magnet plate are electromagnetically coupled, and audio vibration is generated in the diaphragm according to Fleming's law. . The permanent magnet plate, the diaphragm and the buffer member are covered with a frame and attached to the speaker housing.

Japanese Patent Laid-Open No. 9-331596 (paragraph 0009)

Since the conventional electromagnetic transducer is configured as described above, the vibration membrane is mainly a film-like planar shape. To improve the sound pressure level, particularly the sound pressure level of the bass, the vibration membrane area, that is, radiation There is a problem that it is necessary to increase the external dimensions of the speaker in order to increase the area.
Further, since the vibrating membrane vibrates in the vertical direction of the plane, there is a problem that the radiated sound wave has high directivity and is unsuitable as a speaker device for hi-fi.

The present invention has been made to solve the above-described problems, and it is possible to increase the sound radiation area while suppressing the projection area on the front side of the listening and improve the sound pressure level, particularly the sound pressure level of the bass. It aims at obtaining the electromagnetic transducer which can be done.
Another object of the present invention is to obtain a speaker device that can realize non-directional characteristics using the electromagnetic transducer.

  The electromagnetic transducer according to the present invention includes arc-shaped vibrating membranes each having a meandering coil pattern, and arc-shaped first and second arcs arranged in front and rear of the vibrating membrane and having a strip-like multipolar magnetized pattern. Permanent magnet plates, arc-shaped first and second buffer members disposed between the diaphragm and the first permanent magnet plate, and between the diaphragm and the second permanent magnet plate, and the diaphragm Arc-shaped first and second support members that support the first and second permanent magnet plates and the first and second buffer members are provided.

  According to the present invention, it is possible to increase the sound radiation area while suppressing the projected area on the front side of the listening and improve the sound pressure level, particularly the sound pressure level of the bass.

Embodiment 1 FIG.
1 is an exploded perspective view showing a configuration of a speaker device using a plurality of electromagnetic transducers according to Embodiment 1 of the present invention. As shown in FIG. 1, the speaker device 10 includes an arcuate electromagnetic transducer (first electromagnetic transducer) 11, electromagnetic transducers (second electromagnetic transducers) 12, 13, which are arranged in a cylindrical shape. An electromagnetic transducer (third electromagnetic transducer) 14 and speaker frames 15 and 16 that support the arc-shaped electromagnetic transducers 11, 12, 13, and 14 are provided.

  FIG. 2 is an exploded perspective view showing the configuration of the electromagnetic transducer according to Embodiment 1 of the present invention. As shown in FIG. 2, the arc-shaped electromagnetic transducers 11, 12, 13, and 14 include an arc-shaped back permanent magnet plate (second permanent magnet plate) 21, an arc-shaped buffer member (second buffer member). ) 22, arc-shaped vibrating membrane 23, arc-shaped buffer member (first buffer member) 24, arc-shaped front permanent magnet plate (first permanent magnet plate) 25, arc-shaped support member (second A support member 41 and an arc-shaped support member (first support member) 42. Here, the structure 30 is formed by the back permanent magnet plate 21, the buffer member 22, the vibration film 23, the buffer member 24, and the front permanent magnet plate 25, and the frame 40 is formed by the support member 41 and the support member 42.

  Further, as shown in FIG. 2, the back permanent magnet plate 21 has a sound radiation hole 21a, the front permanent magnet plate 25 has a sound radiation hole 25a, the support member 41 has a sound radiation hole 41a, and the support member 42 has a sound radiation hole 25a. Are provided with sound radiation holes 42a. Further, the vibrating membrane 23 has a meandering coil pattern 23b made of a meandering conductor pattern formed on the entire surface of a thin and flexible resin film 23a.

  In the electromagnetic transducers 11, 12, 13, and 14, one vibration film 23 is sandwiched between two permanent magnet plates (a rear permanent magnet plate 21 and a front permanent magnet plate 25) via buffer members 22 and 24. It has a configuration like this. Here, the permanent magnet plate in which the sound radiation hole 25a for radiating sound to the outside is formed is referred to as the front permanent magnet plate 25, and is opposed to the front permanent magnet plate 25 via the vibration plate 23. For the sake of convenience, the permanent magnet plate on which is formed is referred to as a back permanent magnet plate 21.

  FIG. 3 is a view showing a cross section of the electromagnetic transducer according to Embodiment 1 of the present invention. As shown in FIG. 3, the arc-shaped back permanent magnet plate 21 has a band-like different magnetic pole (N pole, S pole) made of sintered ferrite magnets at a constant interval on almost the entire surface facing the vibration film 23. Are alternately formed. Hereinafter, this parallel striped magnetized pattern is referred to as a multipolar magnetized pattern. A so-called neutral zone nz is present in the gap between different magnetic poles (N pole, S pole). The back permanent magnet plate 21 is provided with sound radiation holes 21a at a constant pitch along a neutral zone nz of a gap between magnetic poles (N pole, S pole) having different multipole magnetization patterns.

  An arcuate vibration film 23 is disposed via a buffer member 22 at a position facing the surface of the back permanent magnet plate 21 where the multipolar magnetization pattern is formed. Each of the linear portions in the longitudinal direction of the meandering coil pattern 23b formed on the vibration film 23 has a position corresponding to the neutral zone nz of the gap portion between different magnetic poles (N pole, S pole) of the back permanent magnet plate 21. It is provided to become. Here, the straight portion refers to long straight portions of the meandering coil pattern 23b that are arranged in parallel to each other at a predetermined interval.

  On the front surface of the vibration film 23, a front permanent magnet plate 25 in which a band-like multipolar magnetized pattern made of sintered ferrite magnets is formed on almost the entire surface facing the vibration film 23 with the buffer member 24 interposed therebetween. ing. The front permanent magnet plate 25 is provided with sound radiation holes 25a at a constant pitch along a neutral zone nz of a gap between magnetic poles (N pole, S pole) having different multipolar magnetization patterns.

  A plate-like support member 41 on which the structure 30 is placed on the back surface of the structure 30 on which the back permanent magnet plate 21, the buffer member 22, the vibration film 23, the buffer member 24, and the front permanent magnet plate 25 are stacked. And the frame 40 is comprised by sticking together the support member 42 which covers the front surface of the structure 30, and the circumference | surroundings. In the support member 41 and the support member 42 of the frame 40, sound radiation holes 41a and 42a are provided corresponding to positions where the sound radiation holes 21a and 25a in the portions covering the back surface and the front surface of the structure 30 are formed. Yes.

  This arc-shaped back permanent magnet plate 21, arc-shaped buffer member 22, arc-shaped diaphragm 23, arc-shaped buffer member 24, arc-shaped front permanent magnet plate 25, arc-shaped support member 41, arc-shaped support member 41 The center of the arc of the support member 42 is the same, and is the center of the cylindrical speaker device 10.

  As shown in FIG. 1, by combining the arc-shaped electromagnetic transducers 11, 12, 13, and 14 shown in FIG. 2 with speaker frames 15 and 16, a non-directional cylindrical shape that radiates sound in a circular radial direction in all directions. Speaker device 10 is obtained.

  In FIG. 1, when the front side of the electromagnetic transducer 11 is fixed to the listening point, the electromagnetic transducer (first electromagnetic transducer) 11 is arranged on the front side of the listening for high directivity band. The left and right electromagnetic transducers (second electromagnetic transducers) 12 and 13 are disposed on the listening side surface for the mid-frequency band, and the rear electromagnetic transducer (third electromagnetic transducer) 14 is a bass with low directivity. It can be arranged on the back side for listening to the band, and the entire band can be covered with the listening point.

  As described above, according to the first embodiment, the electromagnetic transducers 11, 12, 13, and 14 are formed with the arc-shaped vibrating film 23 in which the meandering coil pattern is formed and the strip-shaped multipolar magnetization pattern. The arc-shaped front permanent magnet plate 25 and the rear permanent magnet plate 21 arranged before and after the vibration film 23, and between the vibration film 23 and the front permanent magnet plate 25 and between the vibration film 23 and the rear permanent magnet plate 21. By providing the arc-shaped buffer members 24, 22 arranged, the vibration film 23, the front permanent magnet plate 25, the back permanent magnet plate 21, and the arc-shaped support members 42, 41 that support the buffer members 24, 22. In addition, it is possible to increase the sound radiation area while suppressing the projected area on the front side of the listening and to improve the sound pressure level, particularly the sound pressure level of the bass.

  Further, according to the first embodiment, the speaker device 10 includes a high-frequency band electromagnetic transducer 11, a mid-frequency band electromagnetic transducers 12 and 13, and a low-frequency band electromagnetic transducer 14 in a cylindrical shape. By combining and arranging the electromagnetic transducer 11 on the listening front side, the electromagnetic transducers 12 and 13 on the listening side surface, and the electromagnetic transducer 14 on the listening back side, omnidirectional characteristics can be realized. The effect is obtained.

Embodiment 2. FIG.
FIG. 4 is a perspective view showing the configuration of a cylindrical speaker device using a plurality of electromagnetic transducers according to Embodiment 2 of the present invention. As shown in FIG. 4, the speaker device 50 includes a cylindrical electromagnetic converter (fourth electromagnetic converter) 51, a cylindrical electromagnetic converter (fifth electromagnetic converter) 52, and a cylindrical electromagnetic conversion. (Sixth electromagnetic transducer) 53 and speaker frames 15, 16 that support cylindrical electromagnetic transducers 51, 52, 53. Each of the cylindrical electromagnetic transducers 51, 52, 53 is a combination of a plurality of the electromagnetic transducers 11, 12, 13, 14 in Embodiment 1 with a reduced vertical length combined in a cylindrical shape. is there.

  In this cylindrical speaker device 50, cylindrical electromagnetic transducers 51, 52, 53 are arranged one above the other so that, for example, the cylindrical electromagnetic transducer 51 is used for the high frequency band, and the cylindrical electromagnetic transducer 52 is used. Is used for the mid-sound band, and the cylindrical electromagnetic transducer 53 is used for the low-sound band, so that a full-band omnidirectional cylindrical speaker device 50 can be obtained in the horizontal direction.

  As described above, according to the second embodiment, as in the first embodiment, the sound radiation area is increased while suppressing the projected area on the front side of the listening, and the sound pressure level, particularly the sound pressure level of the bass sound is increased. And an electromagnetic transducer 51 formed in a cylindrical shape for a high-frequency band, an electromagnetic transducer 52 formed in a cylindrical shape for a mid-frequency band, and a cylindrical shape for a low-frequency band. Further, by arranging the electromagnetic transducers 53 so as to overlap each other, an effect of realizing non-directional characteristics can be obtained.

It is a disassembled perspective view which shows the structure of the cylindrical speaker apparatus which uses multiple electromagnetic transducers by Embodiment 1 of this invention. It is a disassembled perspective view which shows the structure of the electromagnetic transducer by Embodiment 1 of this invention. It is a figure which shows the cross section of the electromagnetic transducer by Embodiment 1 of this invention. It is a perspective view which shows the structure of the cylindrical speaker apparatus which uses two or more electromagnetic transducers by Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Speaker apparatus, 11 Electromagnetic transducer, 12 Electromagnetic transducer, 13 Electromagnetic transducer, 14 Electromagnetic transducer, 15 Speaker frame, 16 Speaker frame, 21 Back permanent magnet plate, 21a Sound radiation hole, 22 Buffer member, 23 Vibration membrane 23a resin film, 23b meandering coil pattern, 24 buffer member, 25 front permanent magnet plate, 25a sound radiation hole, 30 structure, 40 frame, 41 support member, 41a sound radiation hole, 42 support member, 42a sound radiation hole, 50 speaker device, 51 electromagnetic transducer, 52 electromagnetic transducer, 53 electromagnetic transducer.

Claims (3)

An arc-shaped vibrating membrane in which a meandering coil pattern is formed;
Arc-shaped first and second permanent magnet plates formed with a strip-shaped multipolar magnetized pattern and disposed before and after the vibrating membrane;
Arc-shaped first and second buffer members disposed between the vibrating membrane and the first permanent magnet plate and between the vibrating membrane and the second permanent magnet plate;
An electromagnetic transducer comprising arcuate first and second support members that support the vibrating membrane, the first and second permanent magnet plates, and the first and second buffer members.   The first electromagnetic transducer for the high frequency band according to claim 1, the second electromagnetic transducer for the middle frequency band according to claim 1, and the third electromagnetic transducer for the low frequency band according to claim 1. Combine in a cylindrical shape, arrange the first electromagnetic transducer on the listening front side, arrange the second electromagnetic transducer on the listening side, and arrange the third electromagnetic transducer on the listening rear side. A speaker device characterized by the above.   A fourth electromagnetic transducer formed in a cylindrical shape by a plurality of high frequency band electromagnetic transducers according to claim 1 and a cylindrical shape by a plurality of medium frequency band electromagnetic transducers according to claim 1. A speaker comprising: a fifth electromagnetic transducer and a sixth electromagnetic transducer formed in a cylindrical shape by a plurality of low-frequency band electromagnetic transducers according to claim 1. apparatus.

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