JP2006332780A - Lateral drive speaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lateral drive speaker capable of excellently reproducing a low frequency signal and reproducing a plural kinds of sound signals by using one diaphragm. <P>SOLUTION: The lateral drive speaker includes: the diaphragm 10 with a curved face; a first drive section 20a for supporting a one-end part 10b of the diaphragm 10 and vibratingly driving the diaphragm 10 via the one-end part in response to a first input signal SG1; and a second drive section 20b for supporting the other end 10a of the diaphragm 10 and vibratingly driving the diaphragm 10 via the other end part 10a in response to a second input signal SG2 different from the first input signal SG1. Further, the diaphragm 10 is formed from a metallic foil with high rigidity higher than a specified rigidity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a lateral drive type speaker that vibrates by driving an end face of a drive plate, for example.

  In recent years, AV (Audio Visual) devices in which a display and a speaker are integrated, for example, PDP (Plasma Display Panel) television receivers, liquid crystal television receivers, portable DVD players, etc., have adopted flat panel displays. Equipment is being made thinner.

  Further, in portable information terminal devices such as mobile phones and PDAs (Personal Digital Assistance), flat panel displays such as liquid crystal displays and organic EL displays are generally employed, and the reduction in thickness and weight is being promoted.

  In such AV equipment and portable information terminal equipment, speaker installation space has become a major problem as the whole equipment is being made thinner. In addition, even in a device in which a speaker is mounted separately, there may be a case where a vehicle-mounted device or a narrow space cannot be secured largely. Under such circumstances, the demand for thinner speakers is further increased.

  As a speaker corresponding to such a demand, for example, a rectangular diaphragm is formed to be curved along its length direction, one end thereof is semi-fixed, and the other end is supported via an edge so as to be vibrated, and A speaker is known that is driven by attaching a driver near the other end from the center of the back surface (see, for example, Patent Document 1).

  Further, there is provided a speaker having a curved diaphragm, a coil provided at an end of the diaphragm, and an electromagnet arranged so as to sandwich the coil, and the diaphragm is vibrated by a magnetic driving force of the electromagnet. It is known (see, for example, Patent Document 2).

JP 2004-356868 A (FIG. 3) JP-A 64-54899 (FIG. 3)

  In the general speaker described above, for example, the diaphragm is formed of a film having relatively small rigidity. For this reason, since the area of the diaphragm cannot be made relatively large, it may be difficult to reproduce the low frequency range satisfactorily. Moreover, since the rigidity of the diaphragm is relatively small, it may be difficult to support the diaphragm.

  Further, in the general speaker described above, only one audio signal can be reproduced with one diaphragm. For this reason, when reproducing a plurality of types of audio signals, it is necessary to provide a plurality of diaphragms, which may increase the installation space.

  This invention makes it an example of a subject to cope with such a problem. That is, an object of the present invention is to provide a speaker that can satisfactorily reproduce a low frequency range in a lateral drive type speaker. It is another object of the lateral drive type speaker to provide a speaker that can reproduce a plurality of types of audio signals with a single diaphragm.

  In order to achieve such an object, a laterally driven speaker according to the present invention comprises at least the configurations according to the following independent claims.

  The lateral drive type speaker according to the first aspect of the invention supports a diaphragm having a curved surface, one end of which is fixed or semi-fixed, and the other end of the diaphragm, and the other end according to an input signal. Drive means for radiating sound pressure from the curved surface of the diaphragm in a direction perpendicular to the curved surface, and the diaphragm is a high-rigidity metal whose rigidity is higher than specified. It is formed by foil.

  According to a third aspect of the present invention, the laterally driven speaker supports a diaphragm having a curved surface and one end of the diaphragm, and the vibration is transmitted through the one end in response to a first input signal. A first driving means for driving the plate to vibrate; and the other end portion of the diaphragm, and the diaphragm via the other end portion according to a second input signal different from the first input signal. And a second driving means for driving the vibration.

  The lateral drive type speaker according to the present invention supports a diaphragm having a curved surface, one end of which is fixed or semi-fixed, and the other end of the diaphragm, and the other end is driven in response to an input signal. And it has as a main component the drive means which radiates sound pressure from the curved surface of a diaphragm in the direction orthogonal to the curved surface. At this time, the diaphragm is formed of a highly rigid metal foil whose rigidity is higher than specified.

  The operation of the lateral drive type speaker configured as described above will be described. The driving means vibrates and drives the other end of the diaphragm according to the input signal. The diaphragm formed of a highly rigid metal foil is bent by the vibration driving of the end portion by the driving means, and radiates sound pressure from the curved surface in a direction perpendicular to the curved surface.

  At this time, since the diaphragm is formed of a highly rigid metal foil, the area of the diaphragm can be increased as compared with a general lateral drive type speaker. Since the area of the diaphragm is relatively large, the sound pressure characteristic in the low frequency range is better than that of a general speaker.

  In addition, since the diaphragm is formed of a highly rigid metal foil, the diaphragm of the metal foil can be reliably supported by, for example, a driving unit as compared with a general speaker. That is, since the diaphragm can be supported more reliably, mechanical accuracy and reliability are improved when the entire speaker is downsized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is an explanatory view showing the structure of a laterally driven speaker according to the first embodiment of the present invention. FIG. 2 is a plan view of the lateral drive type speaker 1 shown in FIG. As shown in FIGS. 1 and 2, the lateral drive speaker 1 according to the present embodiment includes a diaphragm 10, a drive unit 20, and a support unit 30. The drive unit 20 corresponds to an embodiment of the drive unit according to the present invention.

  The diaphragm 10 has a curved portion 11 as shown in FIGS. For example, a curved portion 11 is formed at a substantially central portion of the diaphragm 10. Moreover, the diaphragm 10 has elasticity and plasticity. In the present embodiment, the diaphragm 10 is supported so that the one end 10a is mechanically semi-fixed or fixed by the support 30 as shown in FIG. Further, the other end portion 10 b of the diaphragm 10 is joined to and supported by the drive unit 20.

  For example, as shown in FIG. 1, the bending portion 11 has a convex curved surface on the upper side. By changing the curvature of the curved portion 11, the sound quality of the sound wave generated by the diaphragm 10 can be controlled.

  Moreover, the diaphragm 10 is formed using, for example, a paper-based material, a metal-based material, or a composite material obtained by combining them as a base material. The diaphragm 10 according to the present embodiment is preferably formed of a highly rigid metal foil (metal film), for example, compared to a resin film. That is, the diaphragm 10 is formed of a highly rigid metal foil whose rigidity is higher than specified. By using a highly rigid metal foil as the diaphragm 10, for example, the diaphragm 10 having a larger area can be formed as compared with a diaphragm formed of a resin film. By increasing the area of the diaphragm 10 (specifically, the area of the curved surface related to the sound generation of the diaphragm), the sound pressure characteristics in the low sound range are improved. The diaphragm 10 is preferably formed of a metal foil having a relatively small specific gravity, such as magnesium. By using a metal foil having a relatively small specific gravity, the deformation of the diaphragm 10 by its own weight can be reduced. Even if the diaphragm 10 is formed thick in order to increase the rigidity of the diaphragm 10, the weight of the diaphragm 10 can be relatively reduced.

  The drive unit 20 supports the end 10 b of the diaphragm 10. Further, the drive unit 20 drives the diaphragm 10 to vibrate via an end portion 10b of the diaphragm 10 as shown in FIG.

  FIG. 3 is a cross-sectional view for explaining a specific example of the drive unit 20 of the lateral drive speaker 1 shown in FIG. As shown in FIG. 3, the drive unit 20 includes a magnetostrictive element 21, a coil unit 22, and a holding unit 23.

  The magnetostrictive element 21 expands and contracts in response to an external magnetic field generated by the coil unit 22 or the like, for example. In detail, the magnetostrictive element 21 is formed of, for example, a rare earth element, a transition metal element, or the like, and changes its dimensions in accordance with an external magnetic field. For example, as shown in FIG. 3, one end of the magnetostrictive element 21 is joined to one end 10 b of the diaphragm 10 and the other end is joined to the holding portion 23.

  The coil unit 22 is electrically connected to the signal source S0 via, for example, terminals T1 and T2. For example, an electrical signal SG1 corresponding to an audio signal is input from the signal source S0 to the coil unit 22 via terminals T1 and T2. The coil unit 22 generates a magnetic field according to the input signal.

  As shown in FIG. 3, for example, the holding portion 23 has a magnetostrictive element 21 and a coil portion 22 formed on one surface. The holding part 23 is preferably formed of, for example, a nonmagnetic material. This is to reduce the influence of the coil 22 on the magnetic field generated.

  As described above, since the drive unit 20 has a simple structure including the magnetostrictive element 21 and the coil unit 22, the drive unit 20 can be reduced in size as compared with an electrodynamic drive unit.

The operation of the lateral drive type speaker 1 described above will be described with reference to FIGS.
The signal SG1 is input from the signal source S0 to the coil unit 22 via the terminals T1 and T2, and the coil unit 22 generates a magnetic field according to the input signal.
The magnetostrictive element 21 expands and contracts according to the magnetic field generated by the coil unit 22. More specifically, for example, when an electric signal SG1 including an AC component such as an audio signal is input to the coil unit 22 as an input signal, the coil unit 22 generates a variable magnetic field according to the signal SG1. The magnetostrictive element 21 expands and contracts in a direction S <b> 2 along the axial direction of the coil portion 22 as shown in FIG. 3, for example, according to the varying magnetic field generated by the coil portion 22.
As shown in FIG. 1, the end portion 10b of the diaphragm 10 receives a driving force corresponding to the expansion / contraction vibration of the magnetostrictive element 21, and vibrates along the expansion / contraction direction S2 according to the driving force. That is, as shown in FIG. 1, the drive unit 20 is driven to vibrate in the direction S <b> 2 along at least the surface direction of the curved surface of the vibration plate 10 via the end portion 10 b of the vibration plate 10.
The highly rigid diaphragm 10 is bent by the vibration of the end portion 10b of the diaphragm 10, and in the vicinity of the center of the curved portion 11 of the diaphragm 10, for example, a direction orthogonal to the surface direction of the curved portion 11 as shown in FIG. Vibrates along S1.

  As described above, the speaker 1 according to the present embodiment includes the diaphragm 10 having the curved portion 11 having the curved surface, with the one end 10a fixed or semi-fixed, and the other end 10b of the diaphragm 10. And driving the other end portion 10b according to the input signal SG1 to radiate sound pressure from the curved surface of the diaphragm 10 in a direction S1 orthogonal to the curved surface. 10 is formed of a highly rigid metal foil whose rigidity is higher than specified, so that the area of the diaphragm can be increased as compared with a general lateral drive type speaker. Since the area of the diaphragm is relatively large, the sound pressure characteristic in the low frequency range is better than that of a general speaker.

  In addition, since the diaphragm is formed of a highly rigid metal foil, the diaphragm of the metal foil can be reliably supported by, for example, a driving unit as compared with a general speaker. That is, since the diaphragm can be supported more reliably, mechanical accuracy and reliability are improved when the entire speaker is downsized.

  Further, as described above, the diaphragm 10 having the curved portion 11 formed with the curved surface and the end portion 10b of the diaphragm 10 are supported, and the diaphragm 10 is driven to vibrate via the end portion 10b. Accordingly, the lateral drive type speaker 1 as a whole can be thinned.

  That is, as described above, the drive unit 20 has a simple structure including the magnetostrictive element 21 and the coil unit 22 and can be reduced in size as compared with the electrodynamic drive unit. The whole can be thinned.

  Further, the drive unit 20 supports the end portion 10b of the diaphragm 10, and vibrates at least in the direction S2 along the surface direction of the curved surface of the diaphragm 10 via the end portion 10b. Due to the relatively small vibration drive of the end portion 10b, the vibration plate 10 is bent, and in the vicinity of the center portion of the bending portion 11 of the vibration plate 10, for example, along a direction S1 orthogonal to the surface direction of the bending portion 11 as shown in FIG. Therefore, it can vibrate relatively large.

  Further, by forming the diaphragm 10 with a metal having a relatively small specific gravity, such as a magnesium foil, the weight of the lateral drive type speaker 1 as a whole can be made relatively small.

  In the above-described embodiment, the drive unit 20 is provided at one end 10b of the diaphragm 10, and the other end 10a of the diaphragm 10 is semi-fixed or fixed by the support unit 30. Compared with the case where the drive units 20 are provided at both ends of the diaphragm 10, the lateral drive type speaker 1 can be reduced in size.

  FIG. 4 is an explanatory diagram (equivalent circuit diagram) showing an example of a signal supply method for the lateral drive type speaker 1. FIG. 4A is a diagram showing the inductance (L) and the signal source S when the drive unit 20 shown in FIG. 1 is a magnetostrictive element. FIG. 4B is a diagram showing the signal source S, the load resistor R1 and the capacitor C1 when the driving unit 20 is a piezoelectric element. FIG. 4C is an equivalent circuit diagram in which the signal source S is connected in parallel to the load resistor R1 and the capacitor by the drive unit 20 via the transformer T.

  As shown in FIG. 4A, when the signal SG1 is input to the magnetostrictive element 21 from the signal source S via the terminals T1 and T2, the magnetostrictive element 21 receives the action of the magnetic field generated from the coil section 22. Since it is displaced, the inductance (L) is the main component of the drive equivalent circuit. When a piezoelectric element is used as the drive unit 20, a drive equivalent circuit as shown in FIGS. 4B and 4C is obtained. As described above, the electric signal SG1 input to the drive unit 20 can be controlled.

[Second Embodiment]
FIG. 5 is an explanatory diagram for explaining the structure of a laterally driven speaker according to the second embodiment of the present invention. 6 is a plan view of the lateral drive type speaker shown in FIG. The lateral drive type speaker 1a according to the present embodiment supports a diaphragm having a curved surface and one end of the diaphragm, and vibrates and drives the diaphragm via the one end in response to a first input signal. 1st drive means and the 2nd drive means which supports the other end part of the diaphragm, and vibrates and drives the diaphragm via the other end part according to the 2nd input signal different from the 1st input signal And have.

  In the operation of the lateral drive type speaker 1a configured as described above, the first driving means supports one end portion of the diaphragm and vibrates the diaphragm via the one end portion in accordance with the first input signal. The second driving means supports the other end of the diaphragm, and vibrates and drives the diaphragm via the other end in response to a second input signal different from the first input signal.

As described above, for example, with one diaphragm, the diaphragm can vibrate based on two different input signals, and two types of dense and dense waves corresponding to the input signal can be generated.
Further, for example, the lateral drive type speaker 1a according to the present invention includes two types of diaphragms as compared with a general speaker in which two diaphragms that generate one kind of dense and dense waves are provided with one diaphragm. Therefore, it is possible to reduce the installation space of the speaker.

Hereinafter, the speaker 1a according to the present embodiment will be described in detail with reference to FIGS.
As shown in FIGS. 5 and 6, the lateral drive speaker 1 a according to this embodiment includes a diaphragm 10, a drive unit 20 a, a drive unit 20 b, and a support unit 30. The drive unit 20a corresponds to an embodiment of the first drive unit according to the present invention. The drive unit 20b corresponds to an embodiment of the second drive unit according to the present invention. The difference from the first embodiment is that the lateral drive type speaker 1a is provided with drive units 20a and 20b at both end portions 10a and 10b of the diaphragm 10 as shown in FIGS. Components having the same functions in the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  The drive unit 20a supports the one end portion 10b of the diaphragm 10, and drives the diaphragm 10 to vibrate via the one end portion 10b according to the first input signal SG1. The drive unit 20b supports the other end portion 10a of the diaphragm 10, and vibrates and drives the diaphragm 10 via the other end portion 10a according to a second input signal SG2 different from the first input signal SG1. The signals SG1 and SG2 input to the drive unit 20a and the drive unit 20b are different signals that have passed through, for example, a stereo signal, a low-pass filter, a high-pass filter, or the like.

  The operation of the speaker 1a having the above-described configuration will be described with a focus on differences from the first embodiment with reference to FIGS.

  When the electric signal SG1 is input to the driving unit 20a provided at the one end 10b of the diaphragm 10, the coil unit 22 of the driving unit 20a generates a magnetic field according to the input signal SG1. The magnetostrictive element 21 expands and contracts according to the magnetic field generated by the coil unit 22. On the other hand, when the electric signal SG2 is input to the drive unit 20b provided at the other end 10a of the diaphragm 10, the coil unit 22 of the drive unit 20b generates a magnetic field according to the input signal SG2. The magnetostrictive element 21 expands and contracts according to the magnetic field generated by the coil unit 22.

  As shown in FIG. 5, the driving portions 20 a and 20 b provided at both ends of the vibration plate 10 cause the both ends of the vibration plate 10 to have a driving force corresponding to the expansion and contraction vibration of the magnetostrictive element 21 of each of the two driving portions 20. And vibrates along the expansion / contraction direction S2 according to the driving force. That is, as shown in FIG. 5, the drive unit 20 is driven to vibrate in the direction along at least the surface direction of the curved surface of the vibration plate 10 via the end portion of the vibration plate 10.

  The highly rigid diaphragm 10 bends due to vibration at the end of the diaphragm 10, and near the center of the curved portion 11 of the diaphragm 10, for example, a direction S1 orthogonal to the surface direction of the curved portion 11 as shown in FIG. Vibrates along.

  As described above, the laterally driven speaker 1a according to the present embodiment supports the diaphragm 10 having a curved surface and the one end 10b of the diaphragm 10, and the one end 10b according to the first input signal SG1. The first drive unit 20a that vibrates and drives the diaphragm 10 through the other end, and the other end 10a of the diaphragm 10, and the other end according to the second input signal SG2 different from the first input signal SG1 Since the second driving unit 20b that vibrates the diaphragm 10 via the unit 10a is provided, the diaphragm vibrates based on two different input signals, for example, with one diaphragm, and the input signal It is possible to generate two types of dense waves according to the above.

[Third Embodiment]
The lateral drive type speaker 1b according to the third embodiment is substantially the same component as the speaker 1a according to the second embodiment. As a difference from the second embodiment, in the speaker 1b according to this embodiment, the vibration generated in each of the end portions of the diaphragm by the first and second driving means is substantially transmitted via the diaphragm 10. It is the point which has the isolation | separation means to isolate | separate and vibrate. Specifically, for example, in the diaphragm 10, vibrations propagate from the end portions 10a and 10b of the diaphragm 10 through the diaphragm 10 to be attenuated, and the vibrations are substantially separated and vibrated through the diaphragm. As described above, the internal loss of the diaphragm 10 is defined.

  The operation of the speaker 1b configured as described above will be briefly described. By the separating means, the vibrations generated at the ends of the diaphragm by the first and second driving means are substantially separated and vibrated through the diaphragm 10. Specifically, for example, in the vibration plate 10, the vibrations of the end portions 10 a and 10 b of the vibration plate 10 are attenuated by the internal loss of the vibration plate 10 when propagating through the vibration plate 10. It is relatively small that mutual vibrations affect each other. For this reason, the vibrations generated by the drive unit 20a and the drive unit 20b can be separated and vibrated by the single vibration plate 10, and can generate and radiate independent coarse / fine waves (sound waves).

[Fourth Embodiment]
A laterally driven speaker 1c according to the fourth embodiment is substantially the same component as the speaker 1a according to the second and third embodiments. As a difference from the second and third embodiments, as the separating means according to the present embodiment, vibrations propagate from the end portions 10a and 10b of the diaphragm 10 through the diaphragm 10 to be attenuated, and the vibrations. The length between the two end portions 10a and 10b along the curved surface of the diaphragm 10 is defined so that each substantially vibrates separately through the diaphragm 10.

  In the configuration described above, the vibration generated by the both end portions 10a and 10b of the diaphragm 10 propagates through the diaphragm 10 toward the substantially central portion of the curved surface. Each of the vibrations is attenuated by the internal loss of the diaphragm 10. At this time, since the length of the diaphragm 10 is defined as described above, the vibration propagated from both ends substantially separates (independently) and vibrates.

  As described above, as the separating means, the vibration propagates from the end portions 10a and 10b of the diaphragm 10 through the diaphragm 10 and is attenuated, and each vibration is substantially separated through the diaphragm 10. Since the length between the both end portions 10a and 10b along the curved surface of the diaphragm 10 is defined so as to vibrate, the vibration propagated substantially from both end portions may be separated (independently) and vibrated. it can.

[Fifth Embodiment]
FIG. 7 is an explanatory view showing the structure of a laterally driven speaker 1d according to the fifth embodiment of the present invention. As a difference from the second to fourth embodiments, the lateral drive type speaker 1d according to the present embodiment has a separating means along a direction orthogonal to the curved surface of the diaphragm 10 at a specified position of the diaphragm 10. It is a point including a defining means for defining the amplitude smaller than a specified value. Specifically, the lateral drive type speaker 1d has a support portion 40 as shown in FIG. 7, for example. The support portion 40 corresponds to an embodiment of the support means according to the present invention.

  The support unit 40 defines the amplitude along the direction orthogonal to the curved surface of the diaphragm 10 at a prescribed position of the diaphragm 10 to be smaller than a prescribed value. For example, as illustrated in FIG. 7, the support portion 40 is disposed so as to be in contact with the diaphragm 10 so that the amplitude along the direction orthogonal to the curved surface of the diaphragm 10 is substantially zero at a specified position P1. Yes.

  The operation of the above-described configuration will be described focusing on differences from the second to fourth embodiments. Since the support portion 40 defines the amplitude along the direction orthogonal to the curved surface of the diaphragm 10 at a prescribed position of the diaphragm 10 to be smaller than a prescribed value, vibrations at both ends of the diaphragm 10 are substantially separated ( Independent) can vibrate. Specifically, as shown in FIG. 7, since the support portion 40 is disposed so as to contact the diaphragm 10 at the specified position P1, the amplitude of the diaphragm 10 along the direction orthogonal to the curved surface is substantially zero. Thus, the vibrations at both ends of the diaphragm 10 can vibrate substantially separately (independently).

  As described above, the speaker 1c according to the present embodiment has the support portion 40 that defines the amplitude along the direction orthogonal to the curved surface of the diaphragm 10 to be smaller than the defined value at the defined position P1 of the diaphragm 10. Since it is provided, vibrations at both ends of the diaphragm 10 can vibrate substantially separately (independently).

[Sixth Embodiment]
FIG. 8 is an explanatory view showing the structure of a laterally driven speaker 1e according to the sixth embodiment of the present invention. The difference from the second to fifth embodiments is that the lateral drive type speaker 1e according to the present embodiment includes specified position control means for controlling the specified position of the diaphragm 10 by the specifying means. For example, as shown in FIG. 8, the speaker 1 e according to this embodiment includes a specified position control unit 42 that controls a specified position P <b> 1 of the diaphragm 10 by the support unit 40.

  For example, as shown in FIG. 8, the specified position control unit 42 can be controlled to move the specified position P1 of the diaphragm 10 to the specified position P2. For example, the specified position control unit 42 controls the movement of the support unit 40 along the curved surface of the diaphragm 10.

  As described above, since the specified position control unit 42 that controls the specified position of the diaphragm 10 by the support unit 40 is provided, the specified position of the diaphragm 10 can be controlled. That is, when the specified position control unit 42 sets the support unit 40 to the specified position P1 (substantially the center of the curved surface of the diaphragm 10), the area from both ends of the diaphragm 10 to the specified position P1 is approximately. The diaphragm 10 has substantially the same sound quality characteristics with respect to the vibrations at both ends.

  On the other hand, when the specified position control unit 42 sets the support unit 40 to the specified position P2 (for example, a position closer to the end 10a than the substantially central portion of the curved surface of the diaphragm 10), the end of the diaphragm 10 is set. The area from 10b to the specified position P2 is increased, and the area from the end 10a to the specified position P2 is increased. For this reason, bass reproduction characteristics are improved in a portion corresponding to a relatively large area from the end portion 10b to the specified position P2 of the diaphragm 10, and a relatively small portion from the end portion 10a to the specified position P2 of the diaphragm 10 is improved. The high-pitched sound reproduction characteristic is improved in a portion corresponding to the area. That is, the profit regulation position control unit 42 has a function of adjusting the sound quality of the diaphragm 10.

  Further, by inputting the signals SG1 and SG2 suitable for the sound quality characteristic of the diaphragm 10 by the above-described specified position control section 42 to the drive parts 20a and 20b, the sound generation more suitable for the sound quality characteristic is performed from the diaphragm 10. be able to. Specifically, by inputting the bass reproduction signal SG1 to the drive unit 20a and the treble reproduction signal SG2 to the drive unit 20b, the diaphragm 10 performs sound generation more suitable for the bass and treble characteristics. Can do.

  FIG. 9 is an explanatory diagram (equivalent circuit diagram) showing an example of a signal supply method for the laterally driven speakers according to the second to sixth embodiments of the present invention. Specifically, it is a diagram showing an inductance (L) and a signal source S when the driving unit 20 is a magnetostrictive element. As shown in FIG. 9, in the first drive unit 20a, when the signal SG1 is input to the magnetostrictive element 21 from the signal source Sa via the terminals T1 and T2, the magnetostrictive element 21 generates a magnetic field generated from the coil unit 22. Since it is displaced under the action, the inductance (L) is the main component of the drive equivalent circuit. Similarly, in the second drive unit 20b, when the signal SG1 is input to the magnetostrictive element 21 from the signal source Sb via the terminals T1 and T2, the magnetostrictive element 21 receives the action of the magnetic field generated from the coil unit 22. Since it is displaced, the inductance (L) is the main component of the drive equivalent circuit. As described above, the electrical signals SG1 and SG2 input to the drive unit 20 can be controlled.

The present invention is not limited to the embodiment described above.
In the above-described embodiment, the drive unit 20 uses a magnetostrictive element, but is not limited to this form.

  For example, the drive unit 20 may be driven to vibrate by an electrodynamic drive unit (a drive unit that drives a coil provided in an end portion of a diaphragm disposed in a magnetic gap of a magnetic circuit), a piezoelectric element, or the like. Good.

  In addition, for example, in the above-described embodiment, the coil portion is formed in a cylindrical shape so as to surround the magnetostrictive element, but is not limited to this form. The coil portion may generate a magnetic field to be applied in order for the magnetostrictive element to expand and contract.

  In the above-described embodiment, the magnetostrictive element is driven to vibrate the end portion of the diaphragm 10 in the direction S2. However, the present invention is not limited to this form. For example, the magnetostrictive element 34 may drive the diaphragm 10 in a specified direction. More specifically, vibration driving may be performed in a direction orthogonal to the surface direction of the curved portion of the diaphragm 10.

  Moreover, you may combine each of embodiment mentioned above mutually. For example, a highly rigid metal foil or magnesium foil may be used as the diaphragm 10 of each embodiment.

  In the above-described embodiment, the specified position control unit 42 controls the specified position of the support unit 40. However, the present invention is not limited to this mode. For example, the specified position control unit 42 may control the support unit 40 and the diaphragm 10 so as to be disposed at the bonding position or at positions separated from each other. By doing so, it is possible to selectively control whether the vibrations at both ends of the diaphragm 10 are combined vibrations or separated vibrations via the diaphragm 10.

It is explanatory drawing which shows the structure of the lateral drive type speaker which concerns on 1st Embodiment of this invention. It is a top view of the lateral drive type speaker 1 shown in FIG. It is sectional drawing for demonstrating one specific example of the drive part 20 of the lateral drive type speaker 1 shown in FIG. It is explanatory drawing (equivalent circuit diagram) which shows the example of the signal supply system with respect to the lateral drive type speaker 1. FIG. (A) is a figure which shows the inductance (L) and signal source S in case the drive part 20 shown in FIG. 1 is a magnetostriction element. (B) is a diagram showing a signal source S, a load resistor R1 and a capacitor C1 when the drive unit 20 is a piezoelectric element. (C) is an equivalent circuit diagram in which the signal source S is connected in parallel with the load resistor R1 and the capacitor by the drive unit 20 via the transformer T. It is explanatory drawing for demonstrating the structure of the lateral drive type speaker which concerns on 2nd Embodiment of this invention. It is a top view of the lateral drive type speaker shown in FIG. It is explanatory drawing which shows the structure of the lateral drive type speaker 1d which concerns on 5th Embodiment of this invention. It is explanatory drawing which shows the structure of the lateral drive type speaker 1e which concerns on 6th Embodiment of this invention. It is explanatory drawing (equivalent circuit diagram) which shows the example of the signal supply system with respect to the lateral drive type speaker which concerns on 2nd-6th embodiment of this invention.

Explanation of symbols

1, 1a-1e Lateral drive type speaker 10 Diaphragm 11 Bending portion 11
20 Drive part 21 Magnetostrictive element 22 Coil part 23 Holding part 40 Support part 42 Specified position control part

Claims (10)

A diaphragm having a curved surface, one end of which is fixed or semi-fixed;
Driving means for supporting the other end of the diaphragm, driving the other end in accordance with an input signal, and radiating sound pressure from the curved surface of the diaphragm in a direction perpendicular to the curved surface; Have
The diaphragm is formed of a highly rigid metal foil whose rigidity is higher than a specified level. The lateral drive type speaker according to claim 1, wherein the driving unit is driven to vibrate in a direction along a curved surface of the diaphragm via an end portion of the diaphragm. A diaphragm having a curved surface;
First driving means for supporting one end of the diaphragm and driving the diaphragm through the one end in response to a first input signal;
Second driving means for supporting the other end of the diaphragm and driving the diaphragm to vibrate via the other end in response to a second input signal different from the first input signal. Lateral drive type speaker. 4. The separating apparatus according to claim 3, further comprising: a separating unit configured to vibrate the vibration generated in each of the end portions of the diaphragm by the first and second driving units substantially through the diaphragm. 5. Lateral drive type speaker. The diaphragm propagates and attenuates from each of the ends of the diaphragm through the diaphragm, so that each of the vibrations is substantially separated and vibrated through the diaphragm. The lateral drive type speaker according to claim 4, wherein an internal loss of the diaphragm is defined. The separating means is configured such that the vibration propagates from each end of the diaphragm through the diaphragm and is attenuated, and each of the vibrations is substantially separated and vibrated through the diaphragm. The lateral drive type speaker according to claim 4, wherein a length between both end portions along the curved surface of the diaphragm is defined. The lateral drive type speaker according to claim 4, wherein the separating unit includes a defining unit that defines an amplitude along a direction orthogonal to the curved surface of the diaphragm at a specified position of the diaphragm to be smaller than a specified value. . The lateral drive type speaker according to claim 7, wherein the separation unit includes a specified position control unit that controls a specified position of the diaphragm by the specifying unit. The lateral drive type speaker according to any one of claims 3 to 8, wherein the diaphragm is formed of a highly rigid metal foil whose rigidity is higher than a specified value. The lateral drive type speaker according to any one of claims 3 to 8, wherein the diaphragm is formed of a magnesium foil.

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