JP2005236781A - Vibrator for directly driving board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrator for directly driving a board wherein a coil bobbin in the vibrator is prevented from coming in contact with a bottom part and results in being damaged due to the action of a strong external force. <P>SOLUTION: The vibrator includes: a magnetic circuit configuration section including a permanent magnet 12 sandwiched between an outer yoke 11 and an inner yoke 13; a coil inserted to a gap formed by the outer yoke and the inner yoke; and a coupler member 14 for fixing a bobbin 15 with a coil wound thereon, provided with a support member 14 for supporting an elastic body 17 for making the magnetic circuit configuration section freely vibratory, and fitted to the board. A limit member P1 placing a limit on a width of a displacement is provided between the coupler member and the inner yoke within a range wherein a tip of the bobbin is not in contact with the outer yoke when the magnetic circuit configuration section is displaced in a vibrating direction. The gap b3 is set within a range of b2>b3 and a2>b3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vibration device that is directly attached to a plate body and vibrates the plate body, and in particular, a plate that prevents a coil bobbin in the vibration device from bottoming out and being damaged by applying an unnecessary large external force. The present invention relates to a vibration device for direct body driving.

  2. Description of the Related Art Conventionally, in electronic devices such as a stereo playback device, a personal computer, and a mobile phone, a speaker device has been used to output sound information from various media. In this speaker device, a diaphragm that emits sound is attached to a vibration device that is supplied with a drive signal that outputs sound. The diaphragm usually has a horn shape specially designed for the speaker device. For example, a voice coil of the vibration device is fixed to the diaphragm, and the voice coil vibrates in a magnetic circuit. Sound is output.

  Such a speaker device is also used for acoustic reproduction of music and voice in a vehicle, for example, a passenger compartment of a passenger car. The speaker device is embedded in, for example, a door for a front seat, or further placed on a rear tray, and a plurality of speaker devices are mounted on at least one of the front seat and the rear seat. It is common to be mounted and arranged correspondingly.

  However, in addition to arranging the speaker device related to sound reproduction in the front seat door or on the rear tray, it has been proposed to arrange the speaker device on the ceiling plate in the vehicle interior (for example, Patent Document 1). See).

  The speaker device described in Patent Document 1 will be described with reference to FIG. In order to cope with the fact that when a normal speaker device is mounted in a vehicle interior, there are restrictions on the mounting position of the speaker device, and a speaker device having a very large aperture cannot be used. Instead of the above-described conventional speaker device having a caliber, a speaker device directly attached to a ceiling board is used.

  FIG. 8 is an enlarged cross-sectional view showing an example of a speaker device configured by directly attaching the vibration device 1 to, for example, an automobile interior plate 2. In the vibration device 1, a disc-shaped yoke 3 having a pole piece 3-1 at the center, an annular permanent magnet 4 arranged so that the pole piece 3-1 is inserted, and the permanent An outer magnet type magnetic circuit component is formed by the annular yoke 5 overlaid on the magnet.

  The permanent magnet 4 is sandwiched between the yoke 3 and the yoke 5, and the outer peripheral surface of the pole piece 3-1 and the inner peripheral surface of the yoke 5 are arranged with a gap therebetween. A voice coil 8 wound around a cylindrical bobbin 7 is inserted into the gap, and the bobbin 7 is fixed to a coupler member 6 for attaching the vibration device 1 to the interior plate 2. A damper 9 is provided between the yoke 5 and the coupler member 6, and when an AC drive signal is supplied to the voice coil 8, the magnetic circuit constituent part vibrates.

  Since the interior plate 2 is usually made of a material such as urethane or foamed PP, the interior plate 2 itself serves as a diaphragm. Therefore, when an AC drive signal is given to the voice coil 8, the interior plate 2 connected to the coupler member 6 to which the bobbin 7 around which the voice coil 8 is wound is fixed, and an acoustic signal corresponding to the AC drive signal is generated. Can be generated.

  In this way, by using the interior plate 2 as a diaphragm, a large diaphragm area can be secured, so that good sound reproduction in the middle and high range is possible. 8 shows a state in which the vibration device 1 is attached to the upper surface of the interior board 2, but the same effect can be obtained even when it is attached to the lower surface of the interior board 2.

  Various plate body direct drive vibration devices that can be employed as such an in-vehicle speaker device have been proposed (see, for example, Patent Document 2). A specific configuration example of the proposed vibration device will be described with reference to FIGS. 9 and 10.

  FIG. 9 is a side view of the vibration device, and shows a state in which the vibration device is directly attached to the lower surface of the interior plate 2 in an automobile, for example. In the figure, the left half of the vibration device 10 from the center is shown in a longitudinal section. In the vibration device 10, a round dish-shaped outer yoke 11 having a concave portion in which a side wall portion and a bottom portion are continuously formed, a disk-shaped permanent magnet 12 attached to the bottom portion, and a top of the permanent magnet 12. And a disc-shaped inner yoke 13 slightly larger than the permanent magnet 12, and a gap is placed between the inner surface of the side wall of the outer yoke 11 and the outer peripheral surface of the inner yoke 13. The outer yoke 12, the permanent magnet 13 and the inner yoke 14 form a magnetic circuit component.

  The vibration device 10 includes a coupler member 14 that is attached to the surface of the interior plate 2. The coupler member 14 includes a magnetic circuit component including an outer yoke 11, a permanent magnet 12, and an inner yoke 13. Are provided with a plurality of elastic body support members 14-1 to 14-3.

  FIG. 10 is a plan view of the vibration device 10 as viewed from the outer yoke 11 side. The section taken along line XX shown here corresponds to the longitudinal section shown in FIG. In the vibration device 10 illustrated in FIG. 10, the three elastic body support members 14-1 to 14-3 are provided, but the number is not limited to these three. FIG. 9 shows elastic bodies 17-1 to 17-3 for elastically supporting the outer yoke 11 and the coupler member 14, and these elastic bodies 17-1 to 17-3 are formed as outer yokes. 11 is an elastic piece integrally formed with the elastic body attaching member 16 fixed to the edge of the side wall portion, and each tip portion is screwed to the corresponding elastic body supporting member 14-1 to 14-3. It has been stopped.

  As shown in FIG. 9, the cylindrical bobbin 15 around which the coil is wound is fixed to an annular bobbin mounting portion 14-3 provided on the coupler member 14. In addition, the coil wound around the bobbin 15 is shown by the black part in FIG. This coil is inserted into a gap formed between the inner surface of the side wall of the outer yoke 11 and the outer peripheral surface of the inner yoke 13.

  When an AC drive signal is supplied to this coil, vibration is generated in accordance with the frequency of the AC drive signal by the action of the formed magnetic circuit. This vibration is transmitted to the interior board 2 via the coupler member 14. Similarly to the case shown in FIG. 8, the interior plate 2 is formed of a material such as urethane or foamed PP, so that the interior plate 2 itself can serve as a diaphragm. Therefore, when an AC drive signal is applied to the coil, the interior plate 2 is vibrated through the coupler member 14 connected to the bobbin 15 around which the coil is wound, and generates sound corresponding to the frequency of the signal. Can do.

  Thus, by using the interior plate 2 as a diaphragm, a good sound field can be formed. Further, the vibration device 10 shown in FIG. 9 is attached to the lower surface of the interior plate 2. However, the vibration device 1 is attached to the upper side surface of the interior plate 2 between the ceiling plate and the interior plate 2 of the automobile. However, the same effect can be obtained as a speaker device using a plate body direct drive vibration device. Such a vibration device is not limited to an automobile interior plate, but can be directly attached to a plate body to form a panel type speaker device.

Japanese Utility Model Publication No. 6-45865 JP 2003-143690 A

  In the vibration device for plate body direct drive proposed so far, for example, in order to attach the vibration device 1 shown in FIG. 8 between a ceiling plate and an interior plate in an automobile, it is in a narrow space. Since it is limited, it is absolutely necessary to design the entire apparatus thinly. As a result, the distance a1 between the inner surface of the yoke 3 and the tip of the bobbin 7 is reduced. Of course, the interval a1 is designed to be larger than the maximum amplitude of the magnetic circuit component when the AC drive signal is supplied to the coil.

  However, when the interval a1 is narrower than the interval b1 between the tip end surface of the pole piece 3-1 and the inner surface of the coupler member 6, for example, when the vibration device 1 is attached to the interior plate 2, When a large external force is applied, the magnetic circuit component is displaced beyond the maximum amplitude, so that the tip of the bobbin 7 may abut against the inner surface of the yoke 3 and the bobbin 7 may be damaged.

  Similarly, in the case of the vibration device 10 shown in FIG. 9, the distance a2 between the tip of the bobbin 15 and the inner surface of the outer yoke 11 is also designed to be larger than the maximum amplitude of the magnetic circuit component. When the distance a2 is narrower than the distance b2 between the inner yoke 13 and the bobbin mounting portion 14-4 provided on the coupler member 14, when a large external force is applied to the magnetic circuit component, the magnetic circuit component However, the displacement may exceed the maximum amplitude, and the tip of the bobbin 15 may abut against the inner surface of the outer yoke 11 to break the bobbin 15.

  In this way, when the bobbin of the vibration device is damaged, even if the vibration device is attached to the interior plate, it does not play the role of the speaker device and must be replaced. Therefore, there is a problem that the cost is increased, and it is inconvenient when working in a narrow space.

  In the above, the case of mounting between a ceiling board and an interior board in an automobile is taken as an example. However, for example, when a panel type speaker device is formed by attaching a vibration device to a plate body, the vibration device is unnecessary. A large external force may be applied, and even at this time, the above-described problem of breakage of the bobbin occurs.

  Therefore, in view of such problems, the object of the present invention is to provide a restricting means in the vibration device so that the coil bobbin does not hit the bottom even when an unnecessary large external force is applied to the vibration device. It is an object of the present invention to provide a vibration device for direct drive of a plate body in which displacement of a magnetic circuit component is limited.

  In order to solve the above problems, in the present invention, a magnetic circuit component including a permanent magnet sandwiched between a first yoke and a second yoke, and the first yoke and the second yoke A coupler that is attached to a plate body, provided with a support member that supports a coil inserted into the formed gap and an elastic body that fixes the bobbin around which the coil is wound and that allows the magnetic circuit component to vibrate. In the vibration device for directly driving a plate body having a member, when the magnetic circuit component is displaced in the vibration direction, the displacement of the bobbin is within a range in which the tip of the bobbin does not contact the first yoke or the second yoke. It was decided to provide limiting means for limiting the width of the.

  The magnetic circuit component is placed on the dish-shaped first yoke in which a side wall and a bottom are continuously formed, the permanent magnet attached to the bottom, and the permanent magnet. The second yoke is provided with a gap from the side wall, and the restricting means is a restricting member provided on an inner surface of the coupler member, and the restricting member is opposed to a plane of the second yoke. It was decided that it was arranged.

  The restricting means is a restricting member provided on a plane of the second yoke, and the restricting member is disposed to face an inner surface of the coupler member, and the restricting member includes a disc, a polygonal column, a circle It has a shape of any of a ring, a cross-shaped column, or a plurality of columns.

  The restricting means is a restricting member provided on a bobbin mounting member provided on an inner surface of the coupler member for fixing the bobbin, and the restricting member is disposed to face a plane of the second yoke, or A restricting member provided at an end of the side wall of the first yoke, the restricting member being disposed opposite the coupler member, wherein the restricting member is a ring or a plurality of pillars; It was made to have either shape.

  The restricting means is a plurality of restricting members provided on an outer peripheral portion of the coupler member, and the restricting members are disposed in close proximity to the outer peripheral surface of the side wall portion of the first yoke, and the magnetic circuit The displacement is limited to a range in which the tip of the bobbin does not come into contact with the first yoke or the second yoke when the component part is displaced in a biased manner.

  Further, the magnetic circuit component of the vibration device includes the disk-shaped first yoke having a pole piece at the center, the annular permanent magnet, and the first yoke sandwiching the permanent magnet with the first yoke. The coil is inserted into a gap formed between the pole piece and the second yoke, and the restricting means is a restriction provided at the tip of the pole piece. A limiting member disposed opposite to the inner surface of the coupler member, the limiting member having a shape of a disc, a polygonal column, a ring, a cross column, or a plurality of columns It was.

  The restricting means is a restricting member provided on an annular surface of the second yoke, and the restricting member is disposed so as to face the plane of the coupler member or the plate body, and the restricting member includes an annular ring or a plurality of restricting members. It was assumed to have any shape of the pillars.

  As described above, according to the present invention, in a plate body direct drive vibration device using a plate body as a vibration plate, a coupler member for attaching the vibration device to the plate body, and a magnetic circuit component of the vibration device Since the restricting means for restricting the change width between them is provided small, even when a large external force acts on the vibration device when attached to the plate body or after being attached to the plate body, the restriction means is The width of displacement of the magnetic circuit component is limited. Therefore, the tip of the bobbin does not hit the first yoke or the second yoke, and therefore the bobbin is not damaged.

  Further, as the restricting means, a restricting member having any shape of a disc, a polygonal column, a ring, or a plurality of columns can be used, and it is integrated with either the coupler member, the first yoke or the second yoke. In addition, since it can be provided as a separate part, the bobbin can be prevented from being damaged with a simple configuration.

  Further, in the present invention, a plurality of limiting members are erected on the outer peripheral portion of the coupler member, and the limiting members are brought close to the outer peripheral surface of the outer yoke of the magnetic circuit component, so that a large force is generated by the magnetic force of the vibration device. Even if the magnetic circuit component part acts in a biased manner and the magnetic circuit component part is inclined to be displaced in the lateral direction, the outer peripheral surface of the side wall portion of the outer yoke on the side that is biased and displaced comes into contact with the restriction member, and the displacement is restricted, As a result, it is possible to prevent the bobbin from being damaged.

  Next, an embodiment according to the plate body direct drive vibration device of the present invention will be described with reference to the drawings. In the following, each embodiment will be described with reference to how to provide limiting means for limiting the displacement state of the magnetic circuit component when a large external force is applied to the vibration device.

  Example 1 is a case where a limiting member that limits the range of axial displacement of the magnetic circuit component is provided on the inner surface of the coupler member. FIG. 1 shows a vibration device for directly driving a plate body according to the first embodiment. The vibration device shown in FIG. 1 has the same configuration as that of the vibration device 10 shown in FIG. 9, and only the portion shown in the longitudinal section of the vibration device 10 is shown. In FIG. 1, the same parts as those shown in FIG. 9 are denoted by the same reference numerals.

  The vibration device 10 includes a coupler member 14 for attaching to the surface of the interior plate 2, and the coupler member 14 includes a magnetic circuit component including an outer yoke 11, a permanent magnet 12, and an inner yoke 13 with respect to the coupler member 14. Therefore, an elastic body support member 14-1 is provided to support the vibration freely. An elastic body 17-1 is connected to the outer yoke 11 in order to elastically support the magnetic circuit component with respect to the coupler member 14. The elastic body 17-1 is an elastic piece integrally formed with the elastic body mounting member 16 fixed to the end edge portion of the side wall portion of the outer yoke 11, and each tip portion has a corresponding elastic body support. Screwed to the member.

  By the way, as described above, the distance a2 between the tip of the bobbin 15 and the inner surface of the outer yoke 11 is designed to be larger than the maximum amplitude of the magnetic circuit constituent part. When the gap b2 is smaller than the distance b2 from the bobbin mounting portion 14-4 provided on the coupler member 14, a large external force is applied to the magnetic circuit component, causing the magnetic circuit component to be displaced beyond the maximum amplitude. The leading end of the bobbin 15 comes into contact with the inner surface of the outer yoke 11.

  Therefore, in Example 1, a limiting member that limits the range of axial displacement of the magnetic circuit component is provided on the inner surface of the coupler member, and the displacement is limited so that the magnetic circuit component does not displace beyond the maximum amplitude. As a result, the tip of the bobbin 15 does not hit the inner surface of the outer yoke 11.

  In the case of the vibration device 10 shown in FIG. 1, a disc-shaped restricting member P <b> 1 is fixed to the inner surface of the coupler member 14. When the restricting member P1 is integrally formed with the coupler member 14, it is not necessary to fix the restricting member P1 as a separate member, which is convenient. Here, the thickness of the limiting member P1 is adjusted so that b2> b3 and a2> b3 when the distance between the lower surface of the limiting member P1 and the upper surface of the inner yoke 13 is b3. .

  By adjusting the distance in this way, the upper surface of the inner yoke 13 is restricted even when the magnetic circuit component is displaced in the direction of the coupler member 14 when an unnecessary large external force is applied to the magnetic circuit component. It can reach P1 and prevent further displacement. At this time, the interval b3 is 0, but the interval between the tip of the bobbin 15 and the bottom inner surface of the outer yoke 11 can maintain the size of a2-b3, and the tip of the bobbin 15 is outside. There is no contact with the inner surface of the bottom of the yoke 11. Therefore, it is possible to avoid the bobbin 15 from being damaged.

  Here, when the magnetic circuit component of the vibration device 10 is displaced in the axial direction due to the action of an external force, the magnetic circuit component is not necessarily displaced uniformly in the axial direction. When the external force is shifted in the radial direction, the magnetic circuit component is tilted and displaced. Therefore, no matter where the magnetic circuit component is tilted and displaced, the distance a2 between the tip of the coil 15 corresponding to the tilted position and the bottom inner surface of the outer yoke 11 is the size of a2-b3. Need to be maintained.

  In the example shown in FIG. 1, the limiting member P1 is a disc having a predetermined thickness, and the lower surface of the limiting member P1 covers almost the entire surface of the inner yoke 13. It arrange | positions so that it may oppose. In this case, the peripheral portion of the lower surface of the restricting member P1 is always in contact with the upper surface of the inner yoke 13 regardless of the position where the magnetic circuit component is tilted and displaced, and the interval a2 is a2−b3. It will be maintained in size.

  The limiting member P1 shown in FIG. 1 employs a disc body. The shape of the restricting member is not limited to this disk body, and it is sufficient that the restricting member has a shape that can cope with at least the case where the magnetic circuit component portion is inclined and displaced as described above. FIG. 2 shows a modification of the limiting member P1. FIG. 2A is a plan view of the disc body of the limiting member P1 shown in FIG.

  As a modification of the restricting member P1, FIG. 2B shows a quadrangular column or a quadrangular plate, and FIG. 2C shows a hexagonal column or a hexagonal plate. These columns or plates have a plurality of corners, and the plane thereof is sized so as to face the entire upper surface of the inner yoke 13. FIG. 2D shows an example in which the plane of the limiting member is formed in a cross shape. FIG. 2E shows an example of an annular plate, and FIG. 2F shows a plurality of, for example, four small diameter cylinders or circles as the limiting member P1. An example in the case of a board is shown. These restricting members may be formed integrally with the coupler member, or may be formed by fixing a separate member to the coupler member.

  By the way, when the vibration device 10 is attached to an interior plate in an automobile, in order to improve serviceability, the coupler member 14 of the vibration device 10 is not directly attached to the interior plate, but is attached via a bracket member. I have to. In the case of this mounting method, an engaging portion with the bracket member is provided at the center portion of the coupler member 14, and this engaging portion may protrude in a convex shape toward the inner yoke of the vibration device. .

  If such an engaging portion exists in the center portion of the coupler member 14, for example, the disc-shaped limiting member P1 as shown in FIG. 1 cannot be fixed to the inner surface of the coupler member 14, If the limiting member has the shape shown in FIGS. 2E and 2F, this problem can be avoided.

  Example 2 is a case where a limiting member for limiting the range of axial displacement of the magnetic circuit component is provided on the inner yoke of the magnetic circuit component, and is shown in FIG. In the first embodiment, the limiting member is provided on the inner surface of the coupler member. However, in the second embodiment, the way of providing the limiting member is changed from the inner surface of the coupler member to the upper surface of the inner yoke. The configuration of the vibration device 10 other than the changed portion is also based on the vibration device 1 shown in FIG. 9 in the second embodiment shown in FIG. The same reference numerals are given.

  In the second embodiment, the disc-shaped limiting member P2 is provided on the upper surface of the inner yoke 13, and the distance between the inner surface of the coupler member 14 and the upper surface of the limiting member P2 is b4. Due to the presence of the limiting member P2, the displacement width of the magnetic circuit component is limited to the interval b4. Thus, even when the magnetic circuit component is displaced in the axial direction when a large external force is applied to the vibration device, the distance between the tip of the bobbin 15 and the inner surface of the bottom of the outer yoke 11 is a2−b4. Is secured.

  Thus, by providing the limiting member P2, when an unnecessary large external force is applied to the vibration device, the axial displacement of the magnetic circuit component is limited, and the tip of the bobbin 15 is connected to the outer yoke 11. It is possible to prevent the bobbin from being damaged without hitting the inner surface of the bottom of the bobbin.

  As in the case of the first embodiment, the limiting member having the shape shown in FIGS. 2A to 2F can be used as the limiting member P2. Further, these limiting members may be formed by a part of the inner yoke, or may be formed by fixing a separate member to the upper surface of the inner yoke.

  The third embodiment is a case where a limiting member that limits the range of axial displacement of the magnetic circuit component is provided in the bobbin mounting portion of the coupler member, and is shown in FIG. In the first and second embodiments, as a limiting means, limiting members P1 and P2 having a predetermined shape are arranged in a space between the coupler member and the inner yoke to limit the displacement width of the magnetic circuit component in the vibration device. However, in the third embodiment, such a special limiting member is not provided, but the limiting member is changed to be formed as a part of the bobbin mounting portion of the coupler member.

  The configuration of the vibration device 10 other than the changed portion is based on the vibration device 10 shown in FIG. 9 in the third embodiment shown in FIG. 4 as in the first and second embodiments. Are given the same reference numerals.

  In the third embodiment, paying attention to the fact that the lower surface of the bobbin mounting member provided on the coupler member 14 faces the peripheral portion of the inner yoke 13, as a vibration limiting means of the magnetic circuit component of the vibration device, The lower surface of the bobbin mounting portion was further extended toward the inner yoke 13 to form a restricting member 14-5.

  Due to the presence of the limiting member 14-5, the displacement width of the magnetic circuit component is limited to the interval b5. Thus, even when the magnetic circuit component is displaced in the axial direction when a large external force is applied to the vibration device, the distance between the tip of the bobbin 15 and the inner surface of the bottom of the outer yoke 11 is a2−b5. Is secured.

  Thus, by providing the limiting member 14-5, when an unnecessary large external force is applied to the vibration device, the axial displacement of the magnetic circuit component is limited, and the tip of the bobbin 15 is located outside. The bobbin can be prevented from being damaged without hitting the inner surface of the bottom of the yoke 11. Further, since the restricting member 14-5 is disposed so as to face the peripheral edge of the inner yoke 13, it is possible to prevent bobbin damage even when the magnetic circuit component is displaced at any position. it can.

  Even when the bobbin mounting member is disposed outside the bobbin 15, it can be used as a limiting member by extending the member toward the end surface of the side wall portion of the outer yoke 11. Further, as the restricting member 14-5, FIG. 4 shows an annular case integrally formed with the bobbin attaching portion of the coupler member, but the restricting member having the shape shown in FIG. It can also be adopted. Here, the limiting member may be fixed to the bobbin mounting portion as a separate member instead of being integrally formed.

  Example 4 is a case where a limiting member that limits the range of axial displacement of the magnetic circuit component is provided in the outer yoke of the magnetic circuit component, and is shown in FIG. In the third embodiment, as a restricting means, a restricting member obtained by extending a bobbin mounting member provided on the coupler member toward the upper surface of the inner yoke 13 or the end surface of the side wall of the outer yoke 11 is provided. However, in the fourth embodiment, the distal end portion of the side wall portion of the outer yoke 11 is extended toward the coupler member to be a limiting member.

  The configuration of the vibration device 10 other than the changed portion is based on the vibration device 10 shown in FIG. 9 in the fourth embodiment shown in FIG. 5 as in the third embodiment. The same reference numerals are given.

  In the fourth embodiment, focusing on the fact that the front end surface of the side wall portion of the outer yoke 11 faces the outer peripheral surface of the coupler member 14 outside the bobbin 15, as vibration limiting means for the magnetic circuit component of the vibration device. The front end of the side wall of the outer yoke 11 was further extended in the direction of the coupler member 14 to form the limiting member 11-1.

  Due to the presence of the limiting member 11-1, the displacement width of the magnetic circuit component is limited from the interval b2 to the interval b6. Thus, even when the magnetic circuit component is displaced in the axial direction when a large external force is applied to the vibration device, the distance between the tip of the bobbin 15 and the inner surface of the bottom of the outer yoke 11 is a2−b6. Is secured.

  Thus, by providing the limiting member 11-1, when an unnecessary large external force is applied to the vibration device, the axial displacement of the magnetic circuit component is limited, and the tip of the bobbin 15 is located outside. The bobbin can be prevented from being damaged without hitting the inner surface of the bottom of the yoke 11. In addition, since the limiting member 11-1 is disposed so as to face the outer peripheral portion of the coupler member 14, the bobbin breakage can be prevented even when the magnetic circuit component is displaced at any position. it can.

  As the restricting member 11-1, FIG. 5 shows a case where it is formed integrally with the side wall portion of the outer yoke 11 and has an annular shape, but the shape shown in FIG. 2 (f) is restricted. A member can also be employed. Here, the limiting member may be fixed to the front end surface of the side wall portion of the outer yoke 11 as a separate member instead of being integrally formed.

  Example 5 is a case where the coupler member is provided with a limiting member for limiting the lateral inclination of the magnetic circuit component, and is shown in FIGS. 6 and 7.

  In the first to fourth embodiments, the limiting member has a predetermined thickness in a space formed by the coupler member 14 and the magnetic circuit component, that is, the upper surface of the inner yoke or the front end surface of the side wall of the outer yoke. By providing a limiting member, when an unnecessarily large external force is applied to the vibration device, the axial displacement width of the magnetic circuit component is limited, and the bobbin is prevented from hitting the inner surface of the bottom of the outer yoke. It was to prevent damage.

  In the fifth embodiment, the axial displacement of the magnetic circuit component is not limited, but the magnetic circuit component of the vibration device is inclined when an unnecessarily large external force F is applied to a biased position of the vibration device. As a result, the magnetic circuit component is displaced more greatly than the others at the inclined position, and partial bottom contact of the bobbin occurs. Even in such a state, it is intended to prevent the bobbin from being damaged.

  Here, the configuration of the vibration device used is based on the vibration device 10 shown in FIGS. 9 and 10 in the fifth embodiment shown in FIGS. 6 and 7 as well as in the first to fourth embodiments. The same parts are denoted by the same reference numerals.

  In the fifth embodiment, a plurality of limiting members P31 to P33 extending to the outer peripheral surface of the side wall portion of the outer yoke 11 are integrally formed with the coupler member 14 in the outer peripheral portion of the coupler member 14. As shown in FIG. 7, the restricting members P31 to P33 are arranged between the elastic bodies 17-1 to 17-3 and the elastic body attaching member 16, and in the illustrated case, there are three places.

  Here, the inner side surfaces of the restricting members P31 to P33 are set as close as possible to the outer peripheral surface of the side wall portion of the outer yoke 11 within a range that does not hinder vibration due to the coil drive signal of the magnetic circuit driving unit. For this reason, the elastic body mounting member 16 also extends outwardly from the outer peripheral surface of the side wall portion of the outer yoke 11 so that the inner surface of the limiting member is as close as possible to the side wall surface of the outer yoke 11. Avoid overhanging.

  Due to the presence of the restricting members P31 to P33, when the magnetic circuit component portion is inclined, the outer peripheral surface of the side wall portion of the outer yoke comes into contact with the restricting member so that the magnetic circuit component portion is not inclined further. As a result, when an unnecessary large external force F acts on the vibration device at a biased position as shown in the drawing, even if the magnetic circuit component is further inclined, the limiting member P31 prevents the inclination, and as a result, It is possible to prevent the front end of the bobbin 15 and the bottom inner surface of the outer yoke 11 from coming into contact with each other.

  In the first to fifth embodiments described so far, as the plate body direct drive vibration device, the limiting means is provided on the basis of the configuration of the vibration device 10 illustrated in FIGS. 9 and 10. On the other hand, in the sixth embodiment, the vibration device 1 for direct drive of the plate shown in FIG. 8 is provided with limiting means, and the magnetic circuit component of the vibration device 1 is greatly displaced by an external force. It is intended to prevent damage.

  Also in the sixth embodiment, providing the limiting device in the vibration device 1 is the same as in the previous embodiment. Note that the vibration device used in the sixth embodiment is the vibration device 1 shown in FIG. 8, and the configuration of the vibration device 1 is different from the magnetic circuit configuration unit in the previous embodiment. The way of setting will also be different.

  Specifically, a limiting member is disposed between the pole piece 3-1 and the coupler member 6 so that the distance b1 is smaller than the distance a1, and the axial displacement width of the magnetic circuit component is limited. You can also. In this case, a limiting member having the shapes (a) to (b) shown in FIG. 2 can be employed. Further, the outer peripheral portion of the coupler member 6 is made larger than that shown in FIG. 8 so as to protrude over the entire lower surface of the yoke 5. A limiting member can be disposed between the outer peripheral portion of the protruding coupler member 6 and the yoke 5. In this case, a limiting member having the shapes (e) and (f) shown in FIG. 2 can be employed.

  Further, as in the case of the fifth embodiment, a plurality of limiting members are erected on the outer peripheral portion of the protruding coupler member 6, and the limiting members are disposed close to the outer peripheral surface of the permanent magnet 4. When a large external force is applied to the vibration device 1, the permanent magnet 4 comes into contact with the limiting member and restricts the inclination of the magnetic circuit component of the vibration device 1. Therefore, since the partial bottom contact of the bobbin can be prevented, the bobbin can be prevented from being damaged.

In the vibration device according to the first embodiment of the present invention, it is a diagram illustrating that a limiting member that limits the range of axial displacement of the magnetic circuit component is provided on the inner surface of the coupler member. It is a figure explaining the modification of the limiting member in the vibration apparatus of Example 1. FIG. It is a figure explaining having provided the limiting member which restrict | limits the range of the axial direction displacement of a magnetic circuit structure part on the inner side yoke of a magnetic circuit structure part in the vibration apparatus by Example 2 of this invention. In the vibration device according to the third embodiment of the present invention, it is a diagram for explaining that the limiting member for limiting the axial displacement range of the magnetic circuit component is provided in the bobbin mounting portion of the coupler member. In the vibration device according to Example 4 of the present invention, it is a diagram for explaining that a limiting member for limiting the range of axial displacement of the magnetic circuit component is provided in the outer yoke of the magnetic circuit component. In the vibration apparatus according to Example 5 of the present invention, it is a diagram illustrating that the coupler member is provided with a limiting member that limits the lateral inclination of the magnetic circuit component. It is the top view which looked at the vibration apparatus shown by FIG. 6 from the outer side yoke side. It is a figure which shows sectional drawing of the plate body direct drive vibration apparatus by a prior art. It is a figure which shows sectional drawing of the other plate body direct drive vibration apparatus by a prior art. It is the top view which looked at the vibration apparatus shown by FIG. 9 from the outer side yoke side.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 10 ... Vibration apparatus 2 ... Interior board 3, 5 ... Yoke 3-1 ... Pole piece 4, 12 ... Permanent magnet 6, 14 ... Coupler member 7, 15 ... Bobbin 8 ... Coil 9 ... Damper 11 ... Outer yoke 11- DESCRIPTION OF SYMBOLS 1, 14-5, P1, P2, P31-P33 ... Restriction member 13 ... Inner yoke 14-1-14-3 ... Elastic body support member 14-4 ... Bobbin attachment part 16 ... Elastic body attachment members 17-1-17 -3 ... Elastic body

Claims (14)

A magnetic circuit component including a permanent magnet sandwiched between the first yoke and the second yoke;
A coil inserted in a gap formed by the first yoke and the second yoke;
A coupler member attached to the plate body, provided with a support member that supports an elastic body that fixes the bobbin around which the coil is wound and that allows the magnetic circuit component to vibrate;
In a plate body direct drive vibration device having
When the magnetic circuit component is displaced in the vibration direction, the bobbin has a restricting means for limiting a width of the displacement in a range in which a tip end portion of the bobbin does not contact the first yoke or the second yoke. The vibration device.   The magnetic circuit component includes the dish-shaped first yoke having a side wall and a bottom continuously formed, the permanent magnet attached to the bottom, and the permanent magnet mounted on the permanent magnet. 2. The vibration device according to claim 1, further comprising the second yoke provided with a gap from a portion.   3. The vibration device according to claim 2, wherein the restricting unit is a restricting member provided on an inner surface of the coupler member, and the restricting member is disposed to face a plane of the second yoke. .   The said limiting means is a limiting member provided on the plane of the said 2nd yoke, This limiting member is arrange | positioned facing the inner surface of the said coupler member, The said of Claim 2 characterized by the above-mentioned. Vibration device.   5. The vibration device according to claim 3, wherein the limiting member has a shape of any one of a disk, a polygonal column, a ring, a cross-shaped column, and a plurality of columns.   The restricting means is a restricting member provided on a bobbin mounting member provided on an inner surface of the coupler member for fixing the bobbin, and the restricting member is disposed to face a plane of the second yoke. The said vibration apparatus of Claim 2 characterized by these.   3. The restriction member is a restriction member provided at an end portion of the side wall portion of the first yoke, and the restriction member is disposed to face the coupler member. Said vibration device.   The vibration device according to claim 6 or 7, wherein the limiting member has a shape of either a ring or a plurality of pillars. The restricting means is a plurality of restricting members provided on an outer peripheral portion of the coupler member, and the restricting members are disposed in close proximity to the outer peripheral surface of the side wall portion of the first yoke,
The displacement is limited to a range in which the tip of the bobbin does not come into contact with the first yoke or the second yoke when the magnetic circuit component is displaced in an uneven manner. The vibration device. The magnetic circuit component includes the disc-shaped first yoke having a pole piece at the center, the annular permanent magnet, and the second yoke that sandwiches the permanent magnet with the first yoke. And
2. The vibration device according to claim 1, wherein the coil is inserted into a gap formed between the pole piece and the second yoke.   11. The vibration according to claim 10, wherein the limiting means is a limiting member provided at a tip end portion of the pole piece, and the limiting member is disposed to face an inner surface of the coupler member. apparatus.   12. The vibration device according to claim 11, wherein the limiting member has a shape of any one of a disk, a polygonal column, a ring, a cross-shaped column, or a plurality of columns.   11. The limiting means is a limiting member provided on an annular surface of the second yoke, and the limiting member is disposed to face a plane of the coupler member or the plate body. The said vibration apparatus as described in.   The vibration device according to claim 13, wherein the limiting member has a shape of either an annular shape or a plurality of pillars.

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