JP2013172338A - Speaker device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for returning of a voice coil to a neutral position set in a magnetic gap in a state where a driving force is not generated, while regulating vibration of the voice coil in one direction, when holding the vibration system in a speaker device including a vibration direction converting part.SOLUTION: A speaker device 1 includes a static part 100, a diaphragm 10 vibrating for the static part 100, a planar voice coil 30 vibrating in a direction different from that of the diaphragm 10 upon receiving an electric signal, a rigid vibration direction converting part 50 which transmits vibration of the voice coil 30 to the diaphragm 10 vibrating in a different direction, a magnetic circuit 20 having a magnetic gap 20G in which the voice coil 30 is disposed, and a holding part 300 for holding the voice coil 30 at the static part 100. The holding part 300 includes a first holding part 301 for holding vibration of the voice coil 30 in one axial direction, and a second holding part 302 for returning the voice coil 30 to a neutral position in the magnetic gap 20G when an electric signal is not input.

Description

  The present invention relates to a speaker device.

  A conventional speaker includes a magnetic circuit, a voice coil body, a diaphragm, and a frame, and the outer edge side of the diaphragm that is connected to the voice coil body on the inner edge side is connected to the frame via the first edge. The voice coil body is connected to the frame via a damper and a second edge (see, for example, Patent Document 1).

JP 2007-194702 A

  In the conventional speaker, the vibration direction of the voice coil and the vibration direction of the diaphragm coincide with each other. When the speaker is thinned along the vibration direction of the diaphragm, the vibration width of the voice coil is reduced by the thinning of the speaker. It will be regulated. For this reason, it is difficult to achieve both the large amplitude of the diaphragm and the thinning of the speaker, which are necessary when performing low-frequency range reproduction with high sound pressure.

  For this, the vibration direction of the voice coil and the vibration direction of the diaphragm are made different, and the vibration of the voice coil is changed to the diaphragm via the vibration direction converting means for converting the input of one vibration direction into the vibration of the different direction. By transmitting, it is possible to increase both the vibration of the diaphragm and make the speaker thinner. According to this, even when the speaker is thinned along the vibration direction of the diaphragm, the vibration of the voice coil can be increased within a predetermined range.

  A speaker equipped with such a vibration direction converting means regulates the vibration of the voice coil in one direction because the reaction force generated by the vibration of the diaphragm acts on the voice coil in a direction crossing its own vibration direction. A holding means is required. This holding means is required to have a function that can cause vibration along one direction of the voice coil with less mechanical impedance and suppress vibration of the voice coil in a direction crossing this direction.

  On the other hand, the voice coil is required to return to the neutral position set in the magnetic gap when no driving force is generated. As a result, linearity of driving force and amplitude is ensured, and sound reproduction with less distortion becomes possible. However, if the above-mentioned holding means tries to perform vibration along one direction of the voice coil with less mechanical impedance, the elastic force of the holding means has to be reduced, and the voice coil is set in the magnetic gap. It becomes difficult to return to the neutral position.

  This invention makes it an example of a subject to cope with such a problem. That is, when holding the vibration system in the speaker device including the vibration direction converting means, the voice coil is returned to the set neutral position in the magnetic gap while the vibration of the voice coil is restricted in one direction and no driving force is generated. It is an object of the present invention to be able to do so.

In order to achieve such an object, the speaker device according to the present invention has at least the following configuration.
A stationary part, a diaphragm that vibrates with respect to the stationary part, a flat voice coil that receives an electric signal and vibrates in a direction different from that of the diaphragm, and the vibration of the voice coil differs from the vibration A rigid vibration direction converting portion that transmits to the diaphragm that vibrates in a direction; a magnetic circuit having a magnetic gap in which the voice coil is disposed; and a holding portion that holds the voice coil in the stationary portion. Includes a first holding unit that holds the vibration of the voice coil in a uniaxial direction, and a second holding unit that returns the voice coil to a neutral position in the magnetic gap when the electric signal is not input. A speaker device characterized by that.

It is explanatory drawing which showed the basic composition of the speaker apparatus in embodiment of this invention (the figure (a) is sectional drawing along the X-axis direction, the figure (b) is explanatory drawing which showed operation | movement of the drive part). . It is explanatory drawing which showed the example of various forms of the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the other example of a vibration direction conversion part. It is explanatory drawing which shows the other example of a vibration direction conversion part. It is explanatory drawing which showed the example of the form of the holding | maintenance part in the speaker apparatus which concerns on embodiment of this invention. It is explanatory drawing which showed the example of the form of the holding part in the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the example of the form of the holding part in the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing which showed the example of the form of the holding part in the speaker apparatus which concerns on other embodiment of this invention. It is explanatory drawing explaining the structural material of the holding | maintenance part used for the speaker apparatus which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment of the present invention includes the contents shown in the drawings, but is not limited thereto. In the following description of each drawing, parts that are common to the parts that have already been described are assigned the same reference numerals, and duplicate descriptions are partially omitted.

  1A and 1B are explanatory views showing a basic configuration of a speaker device according to an embodiment of the present invention (FIG. 1A is a cross-sectional view along the X-axis direction, and FIG. 1B shows an operation of a drive unit. Illustration). The speaker device 1 includes a stationary unit 100 and a vibrating unit 200 that vibrates with respect to the stationary unit.

  The stationary part 100 is a general term for parts that support the vibration of the diaphragm 10 and the voice coil 30, and in the illustrated example, the frame 12, the magnetic circuit 20 that also functions as the frame 12, and the like correspond to the stationary part 100. The stationary part 100 is not intended to be completely stationary per se, and the entire stationary part 100 vibrates under the influence of vibrations of the diaphragm 10 and the voice coil 30 or other forces. It may be a thing. The magnetic circuit 20 includes a magnetic gap 20G in which the voice coil 30 is disposed.

  The vibration part 200 is a part that vibrates relative to the stationary part 100 due to the vibration of the voice coil 30, such as the diaphragm 10, the voice coil 30, the voice coil support part 40, the vibration direction conversion part 50, and the connection part 60. . The voice coil 30 has a flat plate shape, and receives an electric signal (audio signal) and vibrates in a direction different from that of the diaphragm 10. The vibration direction converter 50 is a rigid part that transmits the vibration of the voice coil 30 to the diaphragm 10 that vibrates in a direction different from the vibration. In the drawing, the voice coil 30 is supported by the voice coil support unit 40, but the voice coil 30 itself may be connected to the vibration direction conversion unit 50. Here, the vibration direction of the voice coil 30 is defined as the X-axis direction, and the two directions orthogonal thereto are defined as the Y-axis direction and the Z-axis direction, respectively. The outer peripheral portion of the diaphragm 10 is supported by a frame 12 that is a stationary portion 100 via an edge 11. The voice coil 30 and the magnetic circuit 20 constitute the drive unit 14 of the speaker device 1.

  The diaphragm 10 may have a substantially rectangular shape in plan view, or may have a circular shape, an elliptical shape, or other shapes. Moreover, the cross-sectional shape of the diaphragm 10 can be formed in a predetermined shape such as a flat plate shape, a dome shape, or a cone shape, for example. In the illustrated example, the cross-sectional shape of the diaphragm 10 is a plane, but may be a curved shape. Moreover, if necessary, the overall height of the diaphragm 10 may be made relatively small, and the speaker device 1 may be thinned.

  In the drive unit 14, the voice coil 30 vibrates in a uniaxial direction along the magnetic gap 20 </ b> G of the magnetic circuit 20, and the vibration direction conversion unit 50 changes the direction and transmits the vibration to the diaphragm 10. In the illustrated example, the voice coil 30 vibrates along the X-axis direction, and the diaphragm 10 is arranged so as to vibrate in the Z-axis direction perpendicular to the X-axis direction. The diaphragm 10 is vibrated in the Z-axis direction by converting the vibration in the direction into a changing oblique angle.

  The magnetic circuit 20 includes a magnet 21 (21A, 21B) and a magnetic pole member (yoke part) 22 (22A, 22B) so that a plurality of magnetic gaps 20G are arranged along the vibration direction (for example, the X-axis direction) of the voice coil 30. It has. Here, the magnetic pole directions of the magnets 21 (21A, 21B) are set so that the magnetic field directions of the pair of magnetic gaps 20G are opposite to each other (± Z-axis direction), and the magnetic gaps having magnetic fields in the opposite directions. By arranging the voice coil 30 around which the conductive member is wound so that currents in opposite directions (± Y-axis direction) flow with respect to 20G, a direction along the magnetic gap 20G (± X-axis) is arranged in the voice coil 30. Direction) driving force (Lorentz force, electromagnetic force). The arrangement relationship between the magnet 21 and the magnetic pole member (yoke part) 22 is not limited to the illustrated example. By forming the voice coil support portion 40 with, for example, a flat insulating member, rigidity (including bending rigidity and torsional rigidity) can be added to the entire voice coil 30.

  One end of the vibration direction conversion unit 50 is connected to the voice coil 30 directly or via another member so that the angle can be changed, and the other end is directly connected to the diaphragm 10 so that the angle can be changed directly or via another member. And are arranged obliquely with respect to the vibration direction of the diaphragm 10 and the vibration direction of the voice coil 30. That is, the vibration direction conversion part 50 is formed at the both ends of the link part 51, the rigid link part 51 that is obliquely provided so that the angle can be freely changed between the voice coil 30 or the voice coil support part 40 and the diaphragm 10. And a joint portion 52 serving as a fulcrum for the angle change of the vibration direction converter 50.

  In the illustrated example, the connecting portion 53 (53A) at one end of the vibration direction changing portion 50 is connected to the voice coil 30 or the voice coil support portion 40 via the connecting portion 60, but directly without using the connecting portion 60. You may connect. The connecting portion 60 is formed between the end portion on the voice coil side of the vibration direction converting portion 50 and the end portion on the vibration direction changing portion side of the voice coil 30 or the voice coil support portion 40, and both ends thereof in the vibration direction. They are connected at intervals along the line. The connecting part 60 absorbs the thickness of the magnetic circuit 20 to reduce the thickness of the speaker device.

  A contact avoiding portion 70 that avoids contact with the joint portion 52 is formed at a portion close to the joint portion 52 of the vibration direction converting portion 50. The contact avoiding unit 70 also functions as a joining member accommodating portion (constraining portion) that accommodates and restrains the joining member that joins the vibration direction converting portion 50. The contact avoiding portion 70 is formed in a concave shape along the joint portion 52, for example, a concave portion, a notch portion, a groove portion, or the like, and the joint portion 52 and the surface of the attachment site disposed in the vicinity of the joint portion 52 A predetermined space is formed between the joint portion 52 and the adhesive member interposed between the vibration direction changing portion 50 and the attachment site. In the illustrated example, a notch 71 is formed as a contact avoiding portion 70 in the connecting portion 60 so as to be close to the joint portion 52 (52A), and a concave portion 72 is formed as a contact avoiding portion 70 in the diaphragm 10 in the joint portion 52 (52B). It is formed so as to be close to. Thereby, when the connection part 53 of the vibration direction conversion part 50 and the end surface of the connection part 60 or the diaphragm 10 are bonded together with a bonding member such as an adhesive or a double-sided tape, the adhesive protrudes toward the joint part 52. In addition, the end portion of the double-sided tape enters the cutout portion 71 or the concave portion 72 so that the joint portion 52 does not come into contact with the end portion.

  As shown in FIG. 6A, such a speaker device 1 inputs a voice signal SS as an electrical signal to the voice coil 30 of the drive unit 14, thereby providing a magnetic signal as shown in FIG. The voice coil 30 or the voice coil support portion 40 vibrates in the X-axis direction shown in the figure along the magnetic gap 20G of the circuit 20, for example. As a result, the vibration is changed in direction by the vibration direction converter 50 and transmitted to the diaphragm 10, and the diaphragm 10 is vibrated in, for example, the Z-axis direction shown in FIG. A corresponding sound is emitted.

  According to such a speaker device 1, since the vibration direction of the voice coil 30 and the vibration direction of the diaphragm 10 are made different by the vibration direction conversion unit 50, the voice coil 30 is moved along the vibration direction of the diaphragm 10. Compared to the case of vibrating, the back side of the diaphragm 10 can be made thinner. As a result, a thin speaker device capable of reproducing the low sound range with high sound pressure can be obtained.

  Furthermore, since the vibration of the voice coil 30 is redirected by the vibration direction converter 50 and transmitted to the diaphragm 10, the speaker device 1 can be increased even if the amplitude of the diaphragm 10 is increased by increasing the amplitude of the voice coil 30. The thickness in the acoustic radiation direction (the overall height of the speaker device) does not increase. This makes it possible to obtain a thin speaker device that can emit a large volume of reproduced sound.

  FIG. 2 is an explanatory diagram showing various examples of the speaker device according to the embodiment of the present invention. In all the examples shown in FIG. 2, the vibration direction converter 50 forms a parallel link including a pair of link portions 51. In the example shown in FIG. 2A, the drive unit 14 drives one diaphragm 10 by a set of voice coil 30 and magnetic circuit 20. In the example shown in FIG. 2B, the drive unit 14 causes the pair of diaphragms 10 and 10 opposed to each other to vibrate in opposite directions by the pair of voice coils 30 and the magnetic circuit 20. In the example shown in FIG. 2C, the driving unit 14 vibrates one diaphragm 10 by the two voice coils 30 and 30 and the magnetic circuits 20 and 20 that are arranged to face each other. In the example shown in FIG. 2D, the drive unit 14 includes a pair of diaphragms 10 (10 </ b> A), which are opposed to each other by two voice coils 30, 30 and magnetic circuits 20, 20 which are opposed to each other. 10 (10B) are vibrated in opposite directions. In the example shown in FIGS. 2A and 2C, the diaphragm 10 is driven on one side, and a unidirectional sound can be emitted. In the example shown in FIG. 2B and FIG. 2D, the diaphragm 10 is driven on both sides, and omnidirectional sound can be emitted.

  FIG. 3 is an explanatory diagram illustrating another example of the vibration direction conversion unit 50. The vibration direction conversion unit 50 (link mechanism 50L) shown in FIG. 3 is used in the embodiment of FIG. 2 (c) in which a pair of drive units are provided and the vibration direction conversion units 50 are arranged so as to face each other substantially symmetrically. is there.

  The vibration direction converter 50 has one end as a joint portion 52A (R), 52A (L) with the first connection portion 53A (R), 53A (L) and the other end as a joint with the second connection portion 53B. A pair of first link portions 51A (R) and 51A (L) are provided as portions 52B (R) and 52B (L). Also, one end is a joint part 52C (R), 52C (L) with the intermediate part of the first link parts 51A (R), 51A (L), and the other end is a joint part 52D ( R) and 52D (L) have a pair of second link portions 51B (R) and 51B (L). As described above, the first connecting portion 53A is connected to the voice coil 30 or the voice coil support portion 40 directly or via the connecting portion 60 as another member, and the second connecting portion 53B is connected to the diaphragm 10. The stationary connection portion 53 </ b> C is connected to the bottom portion of the frame 12 that becomes the stationary portion 100, the yoke portion 22 that forms the magnetic circuit 20, and the like.

  Further, joint portions 52E (R) and 52E () with a pair of connection portions 53D (R) and 53D (L) whose one ends extend integrally from the first connection portions 53A (R) and 53A (L). L) and the other end of the third link portion 51C (R), (L) is the joint portion 52F (R), 52F (L) with the second connecting portion 53B and the connecting portion 53E integrated. Have.

  The first link portion 51A (R), the third link portion 51C (R), the first link portion 51A (L), the third link portion 51C (L), and the second link portion 51B (R ) And the third link portion 51C (L), and the second link portion 51B (L) and the third link portion 51C (R) form a parallel link.

  In the illustrated example, the second connecting portion 53B disposed in the vicinity of the joint portions 52F (R) and 52F (L) and the pair disposed in the vicinity of the joint portions 52A (R) and 52A (L). In the connecting portions 53D (R) and 53D (L), a recess 76 is formed as the contact avoiding portion 70 so that a space is formed between each joint portion and the connecting portion.

  In the vibration direction conversion unit 50, the stationary connection portion 53 </ b> C supported by the frame 12 functions as the stationary unit 100. According to such a vibration direction conversion unit 50, when the joint portions 52A (R) and (L) move so as to be close to each other in the X-axis direction due to the vibration of the voice coil support unit 40, the parallel link mechanism causes the second The connecting portion 53B and the connecting portion 53E integrated therewith rise while maintaining a parallel state, and the first link portions 51A (R), (L) and the third link portion 51C (R) forming a parallel link. , (L) is changed so that the angle rises. At this time, since the joint portions 52D (L) and (R) are supported at both ends of the stationary connection portion 53C that becomes the stationary portion, the first link portion 51A (R) receives the reaction force from the stationary portion. , (L) and the third link portions 51C (R), (L) are reliably changed, and the displacement of the joint portions 52A (R), (L) is reliably converted into the displacement of the diaphragm 10. .

  Similarly, when the joint portions 52A (R) and (L) move away from each other in the X-axis direction, the second link portion 53B and the link portion 53E integrated therewith are lowered by the parallel link mechanism while maintaining the parallel state. The angle is changed so that the first link portions 51A (R), (L) and the third link portions 51C (R), (L) forming the parallel links are tilted. At this time, since the joint portions 52D (R) and (L) are supported by the stationary portion, the first link portions 51A (R) and (L) and the third link receive the reaction force from the stationary portion. The angle of the portions 51C (R) and (L) is reliably changed, and the displacement of the joint portions 52A (R) and (L) is reliably converted into the displacement of the diaphragm 10.

  According to such a vibration direction conversion unit 50, the joint portions 52B (R), (L), 52F (R) in which vibration in the X-axis direction of one voice coil support unit 40 vibrates with substantially the same phase and substantially the same amplitude. , (L) and the second connecting portion 53B are converted into vibrations in the Z-axis direction. As a result, the diaphragm 10 is supported in a wide range and is provided with vibrations having substantially the same phase and substantially the same amplitude. Therefore, the vibration of the voice coil support unit 40 with respect to the planar diaphragm 10 having a large area is provided. Can be transmitted in substantially the same phase.

  In the vibration direction conversion unit 50, the connecting portions 53B, 53D (R), (L), and the third link portions 51C (R), (L) are arranged in parallel in a pair in the width direction, and the first link The portions 51A (R) and (L) are formed in a bifurcated portion, and joint portions 52C (R) and (L) with the second link portions 51B (R) and (L) are formed in the middle portion thereof. The link portions 51B (R), (L) and the connection portion 53C of the link portions 53B, 53D (R), (L), the third link portions 51C (R), ( L). By forming the link portion with a single sheet-like (plate-like) component in this way, the diaphragm 10 can be supported and vibrated on the surface, so that the entire diaphragm 10 can be vibrated substantially in phase. It is possible to suppress divided vibration.

  Moreover, the vibration direction conversion part 50 of this form refracts the whole one plate-shaped member which forms a link part to convex base shape, and 1st link part 51A (R), (L) and 2nd connection part. 53B is formed, and this plate-like member is partially cut out and refracted into a concave shape to form the second link portions 51B (R) and (L) and the stationary connection portion 53C.

  The vibration direction conversion unit 50 can form a link mechanism of the vibration direction conversion unit 50 by using one integral part for the two opposing voice coil support units 40. Even when the provided speaker device is formed, the assembling work can be easily performed. Further, by providing the immovable connecting portion 53C, the joint portion 52D (particularly with respect to the opposing vibration of the voice coil support portion 40 (the plurality of voice coil support portions 40 vibrate in opposite directions to each other). Even if the frames R) and (L) are not supported by the frame 12, the positions of the joint portions 52D (R) and (L) are held constant. Can be simplified.

  As a link mechanism, the right first link portion 51A (R) and the third link portion 51C (R), and the left first link portion 51A (L) and the third link portion 51C (L). Since the parallel link is formed, the second connecting portion 53B fixed to the diaphragm 10 can be stably translated along the Z-axis direction with respect to the opposing vibration of the voice coil support portion 40. As a result, it is possible to apply stable vibration to the planar diaphragm 10.

  In the example shown in FIG. 3A, the convex portion 510 is provided on the link portion where bending is likely to occur due to the opposing vibration of the voice coil support portion 40 to increase the rigidity. In the illustrated example, the first link portions 51A (R), (L), the second link portions 51B (R), (L), the connecting portions 53D (R), (L), and the connecting portions 53C are convex. A portion 510 is provided. Further, in the example shown in FIG. 3B, an opening 520 is provided in a link portion that does not particularly require strength, thereby reducing the weight of the vibration direction changing portion. In the illustrated example, an opening 520 is provided in the connecting portion 53B. The weight reduction of the vibration direction converter is particularly effective in widening the reproduction characteristics and increasing the amplitude and sound pressure level of the sound wave for a predetermined audio current.

  FIG. 4 is an explanatory diagram illustrating another example of the vibration direction converter 50. The vibration direction conversion unit 50 shown in FIG. 4 is provided with a pair of drive units, the vibration direction conversion units 50 are arranged opposite to each other substantially symmetrically, and the pair of vibration plates vibrate in different directions. There are those used in the embodiment.

  In FIG. 2D, the vibration direction conversion unit 50 is configured such that the pair of voice coils 30 and 30 approaches or separates along the X-axis direction, and the first diaphragm 10A and the second diaphragm 10B are Z. It transforms into vibration that approaches or separates along the axial direction. The vibration direction converter 50 shown in FIG. 4 is a combination of the first vibration direction converter 50A that vibrates the first diaphragm 10A and the second vibration direction converter 50B that vibrates the second diaphragm 10B. ing.

  The first vibration direction converter 50A is connected to the first diaphragm 10A and extends along the X-axis direction, and a pair of voice coils 30 disposed along the X-axis direction. , 30 and voice coil side connecting portions 50b, 50b connected to each of them, and a plurality of link portions 50c (a pair of links in the illustrated example) provided between the diaphragm side connecting portion 50a and each voice coil side connecting portion 50b. Link portions 50c, 50c) and a joint portion 50d for connecting the end portion of the link portion 50c and the end portion of the diaphragm side connecting portion 50a or the voice coil side connecting portion 50b. The diaphragm side connecting portion 50a and the voice coil side connecting portion 50b are arranged substantially in parallel. The pair of link portions 50c are substantially symmetrical with respect to the Z-axis (axis along the vibration direction of the diaphragm 20). The first vibration direction conversion unit 50A and the second vibration direction conversion unit 50B are disposed substantially symmetrically with respect to the X axis. The second vibration direction converter 50B includes a diaphragm side connecting portion 50a connected to the second diaphragm 10A and a plurality of voice coil side connecting portions 50b (in the example shown, a pair of voice coil side connecting portions 50b and 50b). ), A plurality of link portions 50c (a pair of link portions 50c and 50c in the illustrated example), and a plurality of joint portions 50d. The diaphragm-side coupling portion 50 a is provided with a fitting convex portion 55 that is fitted into the fitting hole of the diaphragm 10.

  In the first vibration direction conversion unit 50A and the second vibration direction conversion unit 50B, the plurality of link portions 50c are in the Y-axis direction (directions that intersect the vibration direction of the voice coil 31 and the vibration direction of the diaphragm 20 respectively). Are arranged in parallel with a predetermined interval. And the some link part 50c of the 2nd vibration direction conversion part 50B is arrange | positioned between the some link parts 50c of 50 A of 1st vibration direction conversion parts. The voice coil side connecting portion 50b of the first vibration direction conversion section 50A is disposed on the second diaphragm 10B side with respect to the voice coil 30 or the voice coil support section 40, and the voice coil of the second vibration direction conversion section 50B. The side connection portion 50b is disposed on the first diaphragm 10A side with respect to the voice coil 30 or the voice coil support portion 40.

  According to this, the link portion 50c of the first vibration direction conversion section 50A and the link portion 50c of the second vibration direction conversion section 50B that are arranged in parallel in the Y-axis direction are in an intersecting state, and the first vibration direction The voice coil side connection portion 50b of the conversion unit 50A is disposed between the second diaphragm 10B and the voice coil side connection portion 50b of the second vibration direction conversion unit 50B, and the second vibration direction conversion unit 50B. The voice coil side connecting portion 50b is disposed between the first diaphragm 10A and the voice coil side connecting portion 50b of the first vibration direction changing portion 50A.

  The vibration direction conversion unit 50 includes a columnar portion side connecting portion 50f that is directly connected to a columnar portion (not shown) of the stationary portion or connected (directly connected) via another member. In the link portion 50c of the vibration direction converting portion 50, the inclination angle of the link portion 50c (eg, the angle formed by the link portion 50c and the X-axis direction) is changed by the vibration of the voice coil 30 and the reaction force received from the columnar portion. The columnar part of the stationary part is arranged between the columnar part side connecting part 50f of the first vibration direction converting part 50A and the columnar part side connecting part 50f of the second vibration direction converting part 50B. Further, the columnar part 10B of the stationary part 100 is disposed between the voice coil side connection part 50b of the first vibration direction conversion part 50A and the voice coil side connection part 50b of the second vibration direction conversion part 50B. .

  The voice coil side connecting portion 50 b and the link portion 50 c extend along the vibration direction (X-axis direction) of the voice coil 31 and protrude toward the first diaphragm 21 or the second diaphragm 22. 54. The protrusion 54 is formed continuously from one end of the link portion 50c to the other end.

  By providing such a protruding portion 54, the voice coil side connecting portion 50 b and the link portion 50 c have rigidity with respect to the vibration direction of the voice coil 31. The diaphragm-side connecting portion 50a is provided with necessary rigidity by attaching the diaphragm-side connecting portion 50a itself to the diaphragm 20. Moreover, since the protrusion part 54 raises the rigidity of the link part 50c etc., since it protrudes partially, the mass increase of the link part 50c etc. can be suppressed.

  The height of the voice coil side connection portion 50b of the first vibration direction conversion portion 50A and the height of the voice coil side connection portion 50b of the second vibration direction conversion portion 50B in the vibration direction (Z-axis direction) of the diaphragm 20 This difference can be set to a desired size by using a connecting member (not shown). Specifically, by making this difference relatively large, the amplitude of the diaphragm 20 can be made relatively large while making the speaker device 1 thinner. Further, by providing this difference, a part of the thickness of the magnetic circuit 40 in the vibration direction of the diaphragm 20 can be overlapped in the difference, so that the speaker device 1 is thinned and used for the magnetic circuit 40. The thickness of the magnet 41 can be made relatively large, and the electromagnetic force acting on the voice coil 31 can be made relatively large.

  The connecting member includes the voice coil 30 or the voice coil support portion 40, the voice coil side connecting portion 50b of the first vibration direction changing portion 50A, and the voice coil side connecting portion 50b of the second vibration direction changing portion 50B. It is the member which has connected. The connecting member is a spacer that fills the gap between the voice coil side connecting portion 50b of the first vibration direction changing portion 50A and the voice coil side connecting portion 50b of the second vibration direction changing portion 50B arranged at different positions. The voice coil side connecting portion 50b of the first vibration direction converting portion 50A and the voice coil side connecting portion 50b of the second vibration direction converting portion 50B are disposed.

  The speaker device 1 according to the embodiment of the present invention includes a holding unit 300 that holds the vibrating unit 200 on the stationary unit 100 so as to freely vibrate. FIG. 5 is an explanatory diagram showing a configuration example of the holding unit in the speaker device according to the embodiment of the present invention. FIG. 5A shows an example of the form of the holding unit 300 itself, and FIG. 5B shows an example of the form of holding the voice coil 30 by the holding unit 300.

  The holding unit 300 includes a first holding unit 301 that holds the vibration of the voice coil 30 in one axis direction, and a second holding that returns the voice coil 30 to the neutral position in the magnetic gap 20G when no electric signal is input. Part 302 is provided. In the illustrated example, the first holding unit 301 and the second holding unit 302 have different shapes, the first holding unit 301 has a shape in which a linear member is refracted, and the second holding member 302 is curved. It has a shape. In the illustrated example, the first holding unit 301 and the second holding unit 302 are made of different materials, and the first holding unit 301 is a rigid member, and the second holding member is elastic. It is a member. In the illustrated example, the periphery of the first holding unit 301 is surrounded by the second holding unit 302.

  The first holding part 301 includes a plate-like member 301B that can be refracted by a linear joint part 301A that intersects the vibration direction (X-axis direction in the drawing) of the voice coil. The first holding portion 301 is connected in a rhombus shape in plan view with a pair of plate-like members 301B and 301B facing each other, and a linear shape intersecting the vibration direction (X-axis direction in the drawing) of the voice coil 30 at the connection location. The joint portion 301A is provided.

  On the other hand, in the illustrated example, the second holding portion 302 has a surface along a direction (Z-axis direction shown) intersecting the vibration direction (X-axis direction shown) of the voice coil 30. It is an elastic member such as a leaf spring having a curved portion 302A along the (X-axis direction in the drawing). The elastic member may be made of a known material used in metal, fiber, or speaker dampers. The fiber may be impregnated with a thermoplastic resin as necessary.

  In addition, the first holding portion 301 is provided with a flat plate-like attachment portion 301C via a joint portion 301A on the outer side of the bendable plate-like member 301B, and the second holding portion 302 is a flat plate shape on the outer side of the bending portion 302A. Mounting portion 302B is provided. The second holding portion 302 includes a pair of curved portions 302A having two plate-like members facing each other and having different bending directions, and the first holding portion having a rhombus shape in plan view inside the pair of curved portions 302A. The part 301 is arranged.

  The illustrated first holding part 301 regulates the vibration of the voice coil 30 in one direction by refracting the rigid plate-like member 301B at the linear joint part 301A. Even if a force in the Z-axis direction is applied to the coil support portion 40, it has a function of receiving the force and suppressing the displacement of the voice coil 30 in the Z-axis direction. Further, the first holding unit 301 has a function of displacing the voice coil 30 along the direction in which the force acts with a small mechanical impedance when the force in the X-axis direction acts on the voice coil 30.

  On the other hand, the illustrated second holding portion 302 has a function of increasing the force to pull back to the neutral position as the distance from the neutral position of the voice coil 30 increases with respect to the displacement of the voice coil 30 in the X-axis direction. The voice coil 30 has a function of returning the voice coil 30 to the neutral position in the magnetic gap 20G when no driving force is applied to the voice coil 30.

  The arrangement of the first holding unit 301 and the second holding unit 302 will be described based on FIG. In the illustrated example, the first holding portion 301 is provided at four locations on the four sides of the substantially rectangular voice coil 30, and the second holding portion is provided around the two first holding portions 301 close to the connecting portion 60. The part 302 is arranged. The attachment parts 301C and 302B of the first holding part 301 and the second holding part 302 have one attachment part 301C and 302B attached to the voice coil 30 or the voice coil support part 40, and the other attachment part 301C and 302B. It is attached to the stationary part 100.

  When the second holding unit 302 is arranged on the outer periphery of the first holding unit 301 as in the illustrated example, the space for supporting the voice coil 30 or the voice coil supporting unit 40 can be saved and driven. A part or the whole apparatus can be reduced in size.

  The voice coil 30 is formed by winding a conducting wire (conductive member) to which an audio signal is input, and is itself arranged so as to be able to vibrate on the stationary part 100 or the stationary part 100 via the voice coil support part 40. Is arranged so as to freely vibrate. The voice coil support portion 40 can be formed of, for example, a flat insulating member, and the voice coil 30 is supported on the surface or inside thereof. In the voice coil support portion 40, a plurality of conductive layers 43 are formed on the voice coil 30 side. The conductive layer 43 is electrically connected to the lead wire 31 drawn from the start point and end point of the conducting wire of the voice coil 30.

  FIG. 6 is an explanatory diagram showing a configuration example of a holding unit in a speaker device according to another embodiment of the present invention. In the illustrated example, the first holding unit 301 is connected to one of the voice coil 30 before and after the vibration direction (X-axis direction in the drawing) of the voice coil 30 and the second holding unit 302 is connected to the other front and rear of the vibration direction. Are connected. In the drawing, the second holding portion 302 is connected to the connecting portion 60 side, and the first holding portion 301 is connected to the opposite side, but not limited thereto, the first holding portion is connected to the connecting portion 60 side. 301 may be connected and the 2nd holding | maintenance part 302 may be connected to the other side.

  In the example shown in FIG. 6, the first holding unit 301 regulates the vibration of the voice coil 30 in one axial direction (X-axis direction), and the second holding unit 302 determines the position of the voice coil 30 when not driven. It plays a role of returning to the neutral position in the magnetic gap 20G.

  FIG. 7 is an explanatory view showing a configuration example of a holding unit in a speaker device according to another embodiment of the present invention. In the illustrated example, the first holding portion 301 is provided at four locations on the four sides of the substantially rectangular voice coil 30 with respect to the voice coil 30. And the 2nd holding | maintenance part 302 is each arrange | positioned in the vibration direction of the voice coil 30, respectively. In the example shown in FIG. 7, the first holding portion 301 arranged at four locations on the four sides of the voice coil 30 and the second holding portion 302 arranged before and after the vibration direction of the voice coil 30 cooperate to form the voice coil. The second holding portion 302 disposed in front of and behind the vibration direction of the voice coil 30 controls the position of the voice coil 30 when not driven to be neutral within the magnetic gap 20G. It plays the role of returning to the position.

  FIG. 8 is an explanatory view showing a configuration example of a holding unit in a speaker device according to another embodiment of the present invention. The illustrated example is an example in which the second holding unit 302 is configured by an edge 11 that connects the diaphragm 10 to the stationary unit 100. In this embodiment, the voice coil 30 or the voice coil support part 40 can be held on the stationary part only by the first holding part 301. The edge 11 has a function of returning the vibration portions such as the voice coil 20 and the diaphragm 10 (10A, 10B) to the neutral position when not driven. You may add the 2nd holding | maintenance part 302 mentioned above to the holding | maintenance of the voice coil 30 or the voice coil support part 40. FIG. Note that the vibration direction conversion unit 50 in FIG. 8 uses the embodiment shown in FIG.

  In the illustrated example, the edge 11 is constituted by a first edge 11A provided on the acoustic radiation side of the diaphragm 10 (10A, 10B) and a second edge 11B provided on the inner side of the speaker device. In the illustrated example, the first edge 11A and the second edge 11B have two ridges, but this may be one ridge or three or more ridges. Since the first edge 11A radiates a sound wave, the first edge 11A is made of a material that does not adversely affect the sound pressure frequency characteristics, and the voice coil 30 is indirectly held by the second edge 11B so that the vibration system is in a neutral position. It is preferable to have a function of returning to the above. Specifically, the second edge 11B is preferably a fabric material such as aramid fiber impregnated with a thermosetting resin such as a phenol resin.

  FIG. 9 is an explanatory diagram for explaining constituent members of the holding unit used in the speaker device according to the embodiment of the present invention. The first holding unit 301 or the second holding unit 302 can be constituted by a woven fabric C. At this time, the holding function can be enhanced by setting the weaving direction Cd of the woven fabric to a direction intersecting the vibration direction of the voice coil 30 (X-axis direction in the drawing).

  The first holding unit 301 is preferably soft in the vibration direction of the voice coil 30 and hard in the direction intersecting the first holding unit 301. Since the woven fabric C has a characteristic that it is difficult to stretch in the weaving direction N, the first holding portion 301 is formed so that the direction intersecting the weaving direction N becomes the vibration direction of the voice coil 30. As a result, the first holding unit 301 that can perform vibration of the voice coil 30 with less resistance and suppress vibration other than the one-axis direction of the voice coil 30 can be obtained.

  Further, when the woven fabric C is used for the second holding unit 302, it is necessary to apply an elastic force that the second holding unit 302 should bear. In this case, it is preferable to use a warp Cb with a low compliance (hard) and a weft Ca with a high compliance (with expansion and contraction). An appropriate elastic force can be applied to the second holding portion 302 by making the direction of the weft Ca coincide with the vibration direction of the voice coil using the stretchability of the weft Ca.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration.

1: speaker device, 100: stationary part, 200: vibration part,
300: holding part,
301: 1st holding | maintenance part,
301A: joint part, 301B: plate-like member, 301C: attachment part,
302: Second holding unit,
302A: curved portion, 302B: attachment portion,
10: diaphragm, 11: edge, 20: magnetic circuit, 30: voice coil,
50: Vibration direction conversion unit,
C: Woven cloth, Cd: Weaving direction, Ca: Weft, Cb: Warp

Claims (16)

A stationary part;
A diaphragm that vibrates relative to the stationary part;
A flat voice coil that receives an electrical signal and vibrates in a direction different from that of the diaphragm;
A rigid vibration direction converter that transmits the vibration of the voice coil to the diaphragm that vibrates in a direction different from the vibration;
A magnetic circuit having a magnetic gap in which the voice coil is disposed;
A holding part for holding the voice coil in the stationary part;
The holding part is
A first holding unit for holding the vibration of the voice coil in a uniaxial direction;
A speaker device comprising: a second holding unit that returns the voice coil to a neutral position in the magnetic gap when the electric signal is not input.   The speaker device according to claim 1, wherein the first holding unit and the second holding unit have different shapes.   The speaker device according to claim 1, wherein the first holding unit and the second holding unit are made of different materials.   The speaker device according to claim 1, wherein a periphery of the first holding unit is surrounded by the second holding unit.   2. The speaker device according to claim 1, wherein the first holding unit includes a plate-like member that can be refracted by a linear joint that intersects a vibration direction of the voice coil.   The first holding portion includes a pair of plate-like members opposed to each other and connected in a rhombus shape in plan view, and a linear joint portion that intersects the vibration direction of the voice coil is provided at the connection location. The speaker device according to claim 5, wherein:   The speaker device according to claim 6, wherein the first holding portion is provided at four locations on each side of the substantially rectangular voice coil.   7. The second holding portion is an elastic member having a surface along a direction intersecting with a vibration direction of the voice coil and a curved portion along the vibration direction of the voice coil. The speaker device described.   The first holding unit is connected to one of the voice coil before and after the vibration direction of the voice coil, and the second holding unit is connected to the other of the voice coil before and after the vibration direction. 6. The speaker device according to 6.   The speaker device according to claim 1, wherein the second holding unit is configured by an edge that holds the voice coil by connecting the diaphragm to the stationary unit.   The said 1st holding | maintenance part or the said 2nd holding | maintenance part is formed with the woven fabric, The weaving direction of the said woven fabric was made into the direction which cross | intersects the vibration direction of the said voice coil. Speaker device.   The speaker device according to claim 11, wherein the second holding portion is formed of a woven fabric, makes the weft compliance larger than the warp compliance, and matches the direction of the weft with the vibration direction of the voice coil. . The voice coil and the magnetic circuit constitute a drive unit,
The speaker device according to claim 1, wherein the driving unit vibrates one of the diaphragms by a set of the voice coil and the magnetic circuit. The voice coil and the magnetic circuit constitute a drive unit,
2. The speaker device according to claim 1, wherein the driving unit vibrates a pair of opposed diaphragms in opposite directions by a pair of the voice coil and the magnetic circuit. The voice coil and the magnetic circuit constitute a drive unit,
2. The speaker device according to claim 1, wherein the driving unit vibrates one of the diaphragms by the two sets of the voice coils and the magnetic circuit arranged to face each other. The voice coil and the magnetic circuit constitute a drive unit,
2. The speaker device according to claim 1, wherein the driving unit vibrates a pair of opposed diaphragms in opposite directions by the two sets of voice coils and the magnetic circuit arranged opposite to each other.

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