JP2005244804A - Diaphragm, and speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and small diaphragm which restricts mutual interference in a plurality of vibrations and raises the separation degree of the vibration, and to provide a speaker. <P>SOLUTION: A magnetostrictive speaker 10 comprises: the diaphragm 12 including a single plate-like member; and a plurality of magnetostrictive vibration devices 14 for driving the diaphragm 12 by multi-point. The diaphragm 12 is divided into a plurality of areas 12A, 12B, which are partitioned with a plurality of slits (boundary part) 18 for restricting the propagation of the vibration. The vibration is independently performed in the respective areas 12A, 12B. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a diaphragm and a speaker.

  2. Description of the Related Art Conventionally, a speaker in which a diaphragm made of a single plate member is driven at multiple points by a plurality of vibrators is widely known.

  For example, a multipoint drive type flat speaker 1 shown in FIG. 18 includes a diaphragm 3 made of a plate member having a peripheral edge fixed to a speaker frame 2 and a plurality of magnetostrictive speaker drivers that drive the diaphragm 3 at multiple points. 4 is provided. The magnetostrictive speaker driver 4 includes a thin plate-like magnetostrictive element 5 and series-wound coils 6A to 6C wound around the outer periphery of the magnetostrictive element 5 at a predetermined interval.

  In the multipoint driving type flat speaker 1, a plurality of magnetostrictive speaker drivers 4 are driven in the front-rear direction with respect to the diaphragm 3 by the magnetostrictive lateral effect, and are vibrated through four connection pieces 7 attached to the magnetostrictive speaker driver 4. The plate 3 is driven at multiple points.

JP 2000-341792 A

  However, this multi-point drive type flat speaker 1 has a problem in that vibrations at four drive points easily interfere with each other, and vibration isolation (degree of vibration independence at each drive point) is low.

  The multi-point drive type flat speaker 1 is originally intended to drive the diaphragm 3 in the same phase, so that a plurality of independent diaphragms are required to output multi-channel sound. There were limits to cost reduction and miniaturization.

  The present invention has been made in order to solve such a problem, and can reduce the cost and the size, and at the same time, suppress the mutual interference in a plurality of vibrations and increase the vibration separation degree. An object is to provide a diaphragm and a speaker that can be enhanced.

  As a result of earnest research, the inventor of the present invention has developed a diaphragm and a speaker that can reduce the cost and reduce the size, and at the same time suppress the mutual interference in a plurality of vibrations and increase the degree of vibration separation. I found it.

  That is, the above-described object can be achieved by the following present invention.

  (1) It consists of a single plate-like member partitioned into a plurality of regions, and each region is partitioned by a boundary portion that can suppress vibration propagation, and can be vibrated independently for each region. A diaphragm characterized by that.

  (2) The diaphragm according to (1), wherein the boundary portion includes a plurality of slits formed in the diaphragm at predetermined intervals.

  (3) The diaphragm according to (1), wherein the boundary portion includes a groove formed in the diaphragm with a predetermined width.

  (4) The diaphragm according to (1), wherein the boundary portion includes a rib provided on a vibration surface of the diaphragm.

  (5) The diaphragm according to (1), wherein the boundary portion is configured by sandwiching and holding the diaphragm from both sides in the thickness direction.

  (6) The diaphragm according to (1), wherein the boundary portion is configured by placing an elastic member in contact with a vibration surface of the diaphragm.

  (7) Consists of a single plate-like member partitioned into a plurality of regions, and each region is partitioned by a boundary portion that can suppress the propagation of vibration, and can be vibrated independently for each region. And a plurality of vibrating bodies that are individually arranged for each of the regions of the diaphragm and drive the diaphragm in multiple points.

  (8) Each of the vibrating bodies is vibrated at a different frequency, and each region of the diaphragm is partitioned so that the area of the vibrating body is larger as the frequency of the corresponding vibrating body is lower. The speaker according to (7).

  (9) The vibrating body is disposed on the outer periphery of the substantially magnetostrictive rod having a magnetostrictive member, one end of which is fixed to the mass member, and vibrates the magnetostrictive rod in the axial direction. The speaker according to (7) or (8), further comprising a drive coil to be operated.

  (10) The speaker according to (9), wherein the magnetostrictive rod is configured such that a shaft having a lower vibration frequency has a longer axial length.

  (11) The speaker according to (9) or (10), wherein the magnetostrictive member is a giant magnetostrictive member made of a giant magnetostrictive element.

  (12) The speaker according to any one of (7) to (11), wherein the boundary portion of the vibrating body includes a plurality of slits formed at predetermined intervals on the diaphragm.

  (13) The speaker according to any one of (7) to (11), wherein a boundary portion of the vibrating body includes a groove formed in the diaphragm with a predetermined width.

  (14) The speaker according to any one of (7) to (11), wherein the boundary portion of the vibrating body includes a rib provided on a vibration surface of the diaphragm.

  (15) The speaker according to any one of (7) to (11), wherein the boundary portion of the vibrating body is configured by sandwiching and holding the diaphragm from both sides in the thickness direction.

  (16) The boundary portion of the vibrating body is configured by placing an elastic member in contact with a vibration surface of the diaphragm, and is described in any one of (7) to (11). Speaker.

  According to the diaphragm and the speaker according to the present invention, it is possible to reduce the cost and the size of the speaker, and at the same time, it is possible to suppress the mutual interference in a plurality of vibrations and increase the degree of vibration separation. Have.

  The present invention comprises a single plate-like member partitioned into a plurality of regions, and each region is partitioned by a boundary portion that can suppress the propagation of vibration, and can be vibrated independently for each region. The above-described problems are solved by the made diaphragm.

  In addition, it consists of a single plate-like member partitioned into a plurality of regions, and each region is partitioned by a boundary part that can suppress the propagation of vibration, and can be vibrated independently for each region. A speaker that includes a diaphragm and a plurality of vibrators that are individually arranged for each region of the diaphragm and that drives the diaphragm in multiple points. It is.

  Hereinafter, magnetostrictive speakers according to Embodiments 1 and 2 of the present invention will be described in detail with reference to FIGS.

  As shown in FIGS. 1 and 2, the magnetostrictive speaker 10 according to the first embodiment of the present invention includes a diaphragm 12 made of a single plate-like member and two magnetostrictors that drive the diaphragm 12 at multiple points. And a vibration device (vibrating body) 14.

  The peripheral edge of the diaphragm 12 is fixed to a substantially frame-like speaker frame 16. The diaphragm 12 is divided into two regions 12A and 12B. Each of the regions 12A and 12B is partitioned by a plurality of slits 18 formed in the diaphragm 12 at predetermined intervals, and has a structure in which the propagation of mutual vibration can be suppressed with the plurality of slits 18 as boundaries. As a material of the diaphragm 12, for example, wood, glass, plastic, paper or the like can be applied.

  The magnetostrictive vibration device 14 includes a mass member 22 housed in a substantially cylindrical casing 20, a substantially rod-shaped giant magnetostrictive rod 24 made of a giant magnetostrictive member, one end of which is fixed to the mass member 22, and the giant magnetostrictive rod. The drive coil 26 is disposed so as to surround the outer periphery of the motor 24, and the transmission rod 28 is used to transmit the vibration of the giant magnetostrictive rod 24 to the diaphragm 12. The plate 12 is disposed so as to be substantially orthogonal to the vibration surface of the plate 12.

  The mass member 22 is for causing displacement due to the expansion / contraction only on the diaphragm 12 side when the giant magnetostrictive rod 24 is driven to expand and contract. Note that the mass member 22 is a member that has a mass that hardly vibrates due to the expansion and contraction of the giant magnetostrictive rod 24, for example, a mass that is at least about 100 to 200 times that of the giant magnetostrictive rod 24. It is preferable to apply.

  The giant magnetostrictive rod 24 fixed to the mass member 22 is composed of a giant magnetostrictive member made of a giant magnetostrictive element. Here, the “super magnetostrictive element” means a magnetostrictive element made of a powder sintered alloy or a single crystal alloy containing a rare earth element and / or a specific transition metal as a main component (for example, terbium, dysprosium, iron, etc.). It has the property of causing large displacement when a magnetic field is applied from the outside.

  The drive coil 26 can apply a predetermined coil magnetic field in the axial direction of the giant magnetostrictive rod 24, and can vary the coil magnetic field applied to the giant magnetostrictive rod 24 in accordance with an input signal.

  The transmission rod 28 is configured by a substantially disc-shaped flange portion located on the free end side of the giant magnetostrictive rod 24 and a rod portion extending along the axial direction of the giant magnetostrictive rod 24 with the flange portion as a base end. ing. A part of the transmission rod 28 protrudes to the outside of the casing 20, so that the axial vibration of the giant magnetostrictive rod 24 can be transmitted to the diaphragm 12 via the transmission rod 28.

  Next, the operation of the magnetostrictive speaker 10 will be described.

  When a signal having a predetermined frequency is input to the drive coil 26, the magnitude of the coil magnetic field applied to the giant magnetostrictive rod 24 is changed by this signal. As a result, axial displacement occurs in the giant magnetostrictive rod 24 due to the magnetostrictive effect, and the giant magnetostrictive rod 24 repeats expansion and contraction in the axial direction at a predetermined frequency and vibrates. The vibration of the giant magnetostrictive rod 24 is transmitted to the diaphragm 12 via the transmission rod 28, and sound is output from the diaphragm 12.

  By the way, the diaphragm 12 of the magnetostrictive speaker 10 is driven at multiple points by two magnetostrictive vibration devices 14, but the diaphragm 12 is partitioned into two regions 12A and 12B by a plurality of slits 18. The propagation of vibration between the regions 12A and 12B is suppressed. Therefore, although the diaphragm 12 is a single plate-like member, the regions 12A and 12B can vibrate independently and function as substantially independent diaphragms. Therefore, for example, if different audio signals are input to the regions 12A and 12B, multi-channel audio can be output from the diaphragm 12 without substantially interfering.

  According to the magnetostrictive speaker 10 according to the first embodiment, the magnetostrictive speaker 10 includes a single plate-like member partitioned into a plurality of regions 12A and 12B, and a plurality of regions that can suppress vibration propagation between the regions 12A and 12B. A diaphragm 12 partitioned by a slit (boundary portion) 18 and capable of independently vibrating for each of the regions 12A and 12B, and disposed separately for each of the regions 12A and 12B in the diaphragm 12. And a plurality of magnetostrictive vibration devices (vibrating bodies) 14 that drive multiple points, it is possible to suppress mutual interference in a plurality of vibrations and increase the degree of vibration separation. In addition, since the multi-channel sound can be output by the diaphragm 12 which is a single plate-like member, a plurality of diaphragms are unnecessary, and cost reduction and miniaturization can be easily realized.

  Next, the magnetostrictive speaker 30 according to the second embodiment of the present invention will be described with reference to FIGS.

  As shown in the figure, the magnetostrictive speaker 30 according to the second embodiment of the present invention includes a diaphragm 32 made of a single plate-shaped member, and two magnetostrictive vibration devices (vibration) that drive the diaphragm 32 at multiple points. Body) 34, 36.

  The diaphragm 32 is the same as the magnetostrictive speaker 10 according to the first embodiment in that the diaphragm 32 is configured by two regions 32A and 32B partitioned by a plurality of slits 18, but the areas of the regions 32A and 32B are different. The area of the region 32A is larger than the area of the region 32B.

  Also, the point that each region 32A, 32B is individually driven by two magnetostrictive vibration devices 34, 36 is the same as the magnetostrictive speaker 10 according to the first embodiment, but the axial length of one super magnetostrictive rod 38A is the other. The giant magnetostrictive rod 38A is longer than the axial length of the giant magnetostrictive rod 38B and is controlled so as to vibrate at a lower frequency than the giant magnetostrictive rod 38B having a short axial length. Since other structures are the same as those of the magnetostrictive speaker 10 according to the first embodiment, description thereof is omitted.

  According to the magnetostrictive speaker 30 according to the second embodiment, the giant magnetostrictive rods 38A and 38B are configured such that the axial length becomes longer as the vibration frequency is lower, so that the change in sound pressure due to the frequency is reduced. Can do. That is, in general, in order to obtain the same sound pressure at all frequencies, an amplitude larger than the amplitude of the high frequency is required at the low frequency. However, according to the magnetostrictive speaker 30 according to the second embodiment, the vibration amount becomes lower at the lower frequency. The low frequency sound pressure can be obtained at the same level as the high frequency sound pressure.

  In particular, each of the regions 32A and 32B is partitioned so that the area becomes larger as the frequency of the corresponding magnetostrictive vibration device (vibrating body) 34 and 36 is lower, so that the sound pressure can be made more uniform. it can.

  The speaker according to the present invention is not limited to the shape and structure of the magnetostrictive speakers 10 and 30 according to the first and second embodiments. For example, the sound pressure of the magnetostrictive speakers 10 and 30 can be sufficiently obtained. In this case, a magnetostrictive rod made of a magnetostrictive element may be applied instead of the giant magnetostrictive rod.

  In addition, the “vibrating body” in the present invention is not limited to a magnetostrictive vibration device using a magnetostrictive element, and for example, a vibration device using a piezoelectric element can be applied.

  Furthermore, the area of the diaphragm 12 is not limited to two, and the diaphragm may be divided into three or more areas.

  In the first and second embodiments, the boundary between the regions 12A and 12B is configured by the plurality of slits 18. However, the present invention is not limited to this, for example, as shown in FIGS. Like the diaphragm 40, the boundary between the regions 40 </ b> A and 40 </ b> B may be configured by a groove 42 formed in the diaphragm 40 with a predetermined width.

  Further, as in the diaphragm 50 shown in FIGS. 7 and 8, the boundary between the regions 50 </ b> A and 50 </ b> B may be configured by ribs 52 provided on the diaphragm 50.

  Furthermore, as in the diaphragm 60 shown in FIGS. 9 and 10, the boundary between the regions 60A and 60B is configured by holding the diaphragm 60 by holding members 62 from both sides in the thickness direction. Good.

  Further, like the diaphragm 70 shown in FIGS. 11 and 12, the boundary between the regions 70 </ b> A and 70 </ b> B is configured by arranging a rubber (elastic member) 72 in contact with the vibration surface of the diaphragm 70. May be.

  The magnetostrictive speaker according to the present invention is not limited to the structure in which the diaphragm is fixed by the speaker frame. For example, two magnetostrictive speakers 82 are provided as in the magnetostrictive speaker 80 shown in FIGS. The leg 84 may be supported.

  Further, like the magnetostrictive speaker 90 shown in FIGS. 15 to 17, an installation base 94 </ b> A for supporting the diaphragm 92 may be provided on the holding member 94 that holds the diaphragm 92 while sandwiching the diaphragm 92 from both sides in the thickness direction. Good. In addition, it is good also as a structure which provided the installation stand in the rib 52 shown by the said FIG.7 and FIG.8.

1 is a schematic plan view of a magnetostrictive speaker according to Embodiment 1 of the present invention. FIG. 1 is a schematic side sectional view of the magnetostrictive speaker in FIG. Schematic plan view of a magnetostrictive speaker according to Embodiment 2 of the present invention. Schematic side cross-sectional view of the magnetostrictive speaker in FIG. The schematic plan view which shows the example which comprised the boundary part of the diaphragm which concerns on this invention with the groove | channel Schematic side sectional view of the diaphragm in FIG. The schematic plan view which shows the example which comprised the boundary part of the diaphragm which concerns on this invention with the rib Schematic side sectional view of the diaphragm in FIG. The schematic plan view which shows the example which comprised the boundary part of the diaphragm which concerns on this invention using the holding member 9 is a schematic side sectional view of the diaphragm in FIG. The schematic plan view which shows the example which comprised the boundary part of the diaphragm which concerns on this invention using rubber | gum 11 is a schematic side sectional view of the diaphragm in FIG. Schematic front view showing a magnetostrictive speaker having a diaphragm supported by two legs 13 is a schematic side view of the magnetostrictive speaker in FIG. Schematic front view showing a magnetostrictive speaker in which a diaphragm is supported by an installation table provided on a holding member A schematic side view of the magnetostrictive speaker in FIG. Schematic plan view of the magnetostrictive speaker in FIG. Schematic exploded perspective view of a conventional multi-point driving type flat speaker

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Multipoint drive type plane speaker 2, 16 ... Speaker frame 3 ... Diaphragm 4 ... Magnetostrictive speaker driver 5 ... Magnetostrictive element 6A-6C ... Series coil 7 ... Connection piece 10, 30, 80, 90 ... Magnetostrictive speaker 12, 32, 40, 50, 60, 70, 82, 92 ... Diaphragms 12A, 12B, 32A, 32B, 40A, 40B, 50A, 50B,
60A, 60B, 70A, 70B, 82A, 82B, 92A, 92B ... area 14, 34, 36, 86, 96 ... magnetostrictive vibration device 18 ... slit 20 ... casing 22 ... mass member 24, 38A, 38B ... giant magnetostrictive rod 26 ... Drive coil 28 ... Transmission rod 42 ... Groove 52 ... Rib 62, 94 ... Holding member 72 ... Rubber 84 ... Leg 94A ... Installation stand

Claims (16)

  It consists of a single plate-like member divided into a plurality of regions, and each region is partitioned by a boundary part that can suppress the propagation of vibration, and can be vibrated independently for each region. A characteristic diaphragm. In claim 1,
The boundary portion includes a plurality of slits formed at predetermined intervals on the diaphragm. In claim 1,
The said boundary part consists of a groove | channel formed in the said diaphragm with a predetermined width | variety, The diaphragm characterized by the above-mentioned. In claim 1,
The said boundary part consists of a rib provided in the vibration surface of the said diaphragm, The diaphragm characterized by the above-mentioned. In claim 1,
The said boundary part is comprised by inserting | pinching and holding the said diaphragm from thickness direction both sides, The diaphragm characterized by the above-mentioned. In claim 1,
The said boundary part is comprised by contacting and arrange | positioning an elastic member to the vibration surface of the said diaphragm, The diaphragm characterized by the above-mentioned.   A diaphragm comprising a single plate-like member partitioned into a plurality of regions, and each region is partitioned by a boundary portion that can suppress vibration propagation, and can be vibrated independently for each region. And a plurality of vibrators individually disposed for each of the regions of the diaphragm and driving the diaphragm in a multipoint manner. In claim 7,
Each of the vibrators is vibrated at a different frequency, and each region of the diaphragm is partitioned so that the area of the diaphragm is larger as the frequency of the corresponding vibrator is lower. In claim 7 or 8,
The vibrator includes a substantially rod-shaped magnetostrictive rod having a magnetostrictive member, one end of which is fixed to a mass member, and a drive coil that is disposed on an outer periphery of the magnetostrictive rod and vibrates the magnetostrictive rod in an axial direction. And a speaker. In claim 9,
The speaker according to claim 1, wherein the magnetostrictive rod is configured such that the lower the vibration frequency, the longer the axial length. In claim 9 or 10,
The speaker according to claim 1, wherein the magnetostrictive member is a giant magnetostrictive member made of a giant magnetostrictive element. In any of claims 7 to 11,
The boundary part of the said vibrating body consists of a some slit formed in the said diaphragm at predetermined intervals. In any of claims 7 to 11,
The speaker is characterized in that the boundary portion of the vibrating body is formed by a groove formed in the diaphragm with a predetermined width. In any of claims 7 to 11,
The speaker is characterized in that the boundary portion of the vibrating body is formed of a rib provided on a vibration surface of the diaphragm. In any of claims 7 to 11,
The boundary part of the said vibrating body is comprised by inserting | pinching and holding the said diaphragm from thickness direction both sides, The speaker characterized by the above-mentioned. In any of claims 7 to 11,
The boundary part of the said vibrating body is comprised by arrange | positioning an elastic member in contact with the vibration surface of the said diaphragm, The speaker characterized by the above-mentioned.

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