Vibration device

Abstract

Provided is a vibration device equipped with leaf springs that can move for an adequate amount in response to an attraction force produced by a coil when being magnetized. When the coil is magnetized, a magnetic circuit is formed by a housing, a stator core, a moving core, and the leaf springs. In addition, the leaf spring are arranged at positions located symmetrically about the central axis of the coil. The leaf springs are each formed in an identical shape, and each have formed therein a slit that increases the amount of movement of the leaf spring. Further, the slit has a width for allowing magnetism to pass therethrough when the coil is magnetized. The symmetrical arrangement of the leaf springs around the central axis of the coil assures a preferable balance. Due to the slits formed in the leaf springs, it is possible to move the moving core appropriately. Furthermore, since magnetic fluxes are allowed to flow through the slits when the coil is excited, it is also possible to suppress magnetic saturation.

Description

Cross - reference to related applications , , ,

[0006] ,

[0001] This application is based on Japanese Patent Application No. 2022 - 54483 filed in Japan on March 29, 2022, and the contents of the base application are hereby incorporated by reference in their entirety.

Technical Field

[0002] The present disclosure relates to a vibration device and is suitable for use, for example, as a device that provides vibration - based information to a person using a device.

Background Art

[0003] As a need for vibration devices, if the device in which the vibration device is installed becomes smaller, corresponding miniaturization is required. On the other hand, when the vibration device is miniaturized, the coil is also miniaturized, and a decrease in the attractive force is also a concern.

[0004] Patent Document 1 describes that when a coil is excited, a moving core moves against the elastic force of an elastic member. Also, Patent Document 1 describes using a metal member such as a leaf spring as the elastic member. And there is a description of using the elastic member as a member constituting a magnetic circuit. However, Patent Document 1 does not explain the specific shape of the leaf spring. The elastic member for which the shape is described in Patent Document 1 is a resin material. [[ID=​​​​​​​​​​​​​​​​​This disclosure aims to provide a vibration device equipped with a leaf spring capable of displacing a sufficient amount in response to the attractive force of the coil during excitation. Specifically, the aim is to enable sufficient vibration to be applied to the moving core by devising the shape of the leaf spring supporting the moving core. Furthermore, the aim is to make magnetic saturation caused by the leaf spring less likely to occur when the leaf spring is used as a component of a magnetic circuit.

[0007] The first aspect of this disclosure is a vibration device comprising: a coil wound on a cylindrical bobbin and excited by electric current; a housing that holds the coil; a stator core disposed on the inner circumference of the coil and supported by the housing; a moving core disposed on the inner circumference of the coil opposite the stator core via a magnetic gap; and a leaf spring fixed to the moving core and also fixed to the housing, which biases the moving core in a direction away from the stator core.

[0008] Furthermore, in the first aspect of this disclosure, a control device is provided to control the power supply to the coil, enabling and de-energizing it. When the control device energizes the coil and energizes it, the housing, stator core, moving core, and leaf springs form a magnetic circuit, attracting the moving core towards the stator core with a magnetic gap. When the control device terminates the power supply to the coil and de-energizes it, the elastic force of the leaf springs moves the moving core in a direction that pulls it back from the stator core. The moving core vibrates within the housing due to its movement towards the stator core when the coil is energized and its movement back from the stator core when the coil is de-energized. In addition, multiple leaf springs are arranged symmetrically around the central axis of the coil, each leaf spring has the same shape as the others, and each leaf spring has a slit formed in it that increases the amount of displacement of the leaf spring. That is, the slits can extend the distance between the fulcrum and the point of force application of the leaf spring, and the stress applied to the leaf spring is relieved, so the amount of displacement of the leaf spring can be increased. Furthermore, this slit is wide enough for the magnetic field to pass through when the coil is excited, the slit prevents the magnetic field from saturating, and the leaf spring forming the slit functions as a component of the magnetic circuit, so that when the coil is excited, a magnetic circuit is formed in the housing, stator core, and moving core. The moving core has a cylindrical portion located on the inner circumference of the bobbin and a flat plate portion facing the flange of the bobbin. The magnetic gap is formed between the cylindrical portion and the stator core, and the magnetic circuit of the moving core is formed between the cylindrical portion and the flat plate portion located on the coil side of the leaf spring.

[0009] In the first aspect of this disclosure, multiple leaf springs of the same shape are arranged symmetrically around the central axis of the coil, resulting in a well-balanced arrangement when the moving core moves. Furthermore, slits are provided in the leaf springs to increase the amount of displacement, making it possible to appropriately displace the moving core. Moreover, when the coil is excited, the magnetic flux flows between the slits, which suppresses magnetic flux saturation even when the cross-sectional area of ​​the leaf springs is reduced.

[0010] The second aspect of this disclosure is that the spacing between the multiple leaf springs is approximately the same as the width of the slit. Because the spacing between the leaf springs is narrowed to the same extent as the width of the slit, magnetic flux can flow between the leaf springs when the coil is excited. This makes it possible to further enhance the effect of suppressing magnetic saturation.

[0011] A third aspect of this disclosure is that the leaf spring has a first plate portion fixed to a housing, a second plate portion fixed to a moving core, and a connecting portion connecting the second plate portion and the first plate portion. The slit is formed between the first plate portion and the second plate portion. By forming a slit between the first plate portion and the second plate portion, the deformation of the first plate portion and the second plate portion can be utilized, making it possible to increase the displacement of the leaf spring.

[0012] The fourth aspect of this disclosure is that the width of the first plate portion, the width of the second plate portion, and the width of the connecting portion are substantially the same. This makes it possible to avoid the occurrence of a region that constricts the magnetic flux inside the leaf spring when the coil is excited.

[0013] The fifth aspect of this disclosure is the outer circumference of multiple leaf springs, the portions facing the housing being interconnected. Since the multiple leaf springs are interconnected at their outer circumference, they can be assembled integrally, making assembly easier.

[0014] The sixth aspect of this disclosure is that the outer circumferences of the multiple leaf springs are crimped and fixed to the housing. Since the multiple leaf springs are interconnected by their outer circumferences, crimping and fixing is possible. The seventh aspect of this disclosure refers to the slits and spacing of the leaf spring collectively as the inter-space, achieving the same effects as the first aspect of this disclosure. [Brief explanation of the drawing]

[0015] [Figure 1] Figure 1 is a perspective view of the vibration device. [Figure 2] Figure 2 is a plan view of the vibration device shown in Figure 1. [Figure 3] Figure 3 is a front view of the vibration device shown in Figure 1. [Figure 4] Figure 4 is a cross-sectional view along the line IV-IV in Figure 2. [Figure 5] Figure 5 is a perspective view of another example of a vibration device. [Figure 6] Figure 6 is a perspective view of yet another example of a vibrating device. [Figure 7] Figure 7 is a diagram showing an example of the use of a vibration device. [Figure 8] FIG. 8 is a perspective view of still another example of the vibration device. [Figure 9] FIG. 9 is a perspective view of still another example of the vibration device. [Figure 10] FIG. 10 is a perspective view of still another example of the vibration device. [Figure 11] FIG. 11 is a front view of the vibration device illustrated in FIG. 10. [Figure 12] FIG. 12 is a perspective view of still another example of the vibration device. [Figure 13] FIG. 13 is a front view of the vibration device illustrated in FIG. 12.

BEST MODE FOR CARRYING OUT THE INVENTION

[0016] In FIGS. 1 to 4, reference numeral 100 denotes a vibration device. As shown in FIG. 7, the vibration device 100 is disposed, for example, on the seating surface or the back surface of a seat 200 of an automobile. The vibration device 100 is used to transmit information such as forgetting to fasten a seat belt or danger prediction to a passenger by vibration. The vibration information from the vibration device 100 is information that can be directly transmitted to the passenger. And since it is information different from normal signal information such as vision and hearing, it is a particularly useful information transmission means as danger prediction information. For example, when a sensor (not shown) detects a possibility of collision, the vibration device 100 is vibrated.

[0017] The housing of the vibration device 100 has a hexagonal shape with a front width of about 30 millimeters as shown in FIG. 3. The height of the housing 110 is about 10 to 15 millimeters. Further, the housing 110 is made of an iron-based material that allows magnetic flux to pass through. The housing 110 includes a hexagonal bottom portion 111 and a wall portion 112 that extends vertically from the bottom portion 111. The tip of the wall portion 112 opens outward to form a flange portion 113. Two mounting pieces 114 extend outward from the bottom portion 111, and mounting holes are formed in the mounting pieces 114. With this mounting piece 114, the vibration device is fixed to the frame of the automobile seat 200 by a frame bolt 120.

[0018] As shown in FIG. 4, a bobbin 130 made of an insulating resin material is disposed inside the housing 110. The bobbin 130 has a cylindrical shape with flange portions 131 at both ends. A copper wire coated with enamel is wound around the bobbin 130 a number of times (for example, 300 turns) to form a coil 140.

[0019] A stator core 118 is disposed on the inner circumference of the bobbin 130. More specifically, the stator core 118 is integrally formed with the bottom portion 111 of the housing 110. Then, the inner circumference of the bobbin 130 fits onto the outer circumference of the stator core 118, whereby the coil 140 is positioned within the housing 110. The coil 140 and the housing 110 are fixed by adhesion with an adhesive or bolts or the like.

[0020] A moving core 150 is also disposed on the inner circumference of the bobbin 130. The moving core 150 is disposed opposite the stator core 118 with a magnetic gap therebetween. The moving core 150 is also made of an iron-based material similar to the housing 110 and the stator core 118. The moving core 150 includes a cylindrical portion 151 located on the inner circumference of the bobbin 130 and a flat plate-like portion 152 facing the flange portion 131 of the bobbin 130. The flat plate-like portion 152 has the same hexagonal shape as the housing 110 and is compactly accommodated within the housing 110.

[0021] As shown in Figure 2, the moving core 150 is fixed to the flange portion 113 of the housing 110 by a leaf spring 160. The leaf spring 160 is made of spring steel, is generally J-shaped, and consists of a first plate portion 161, a second plate portion 162, and a connecting portion 163 that connects the first plate portion 161 and the second plate portion 162. A slit 164 is formed between the first plate portion 161 and the second plate portion 162. In other words, the leaf spring 160 is separated into the first plate portion 161 and the second plate portion 162 by this slit 164. As a result, the lengths of the first plate portion 161 and the second plate portion 162 can be increased relative to the area of ​​the leaf spring 160, thereby easing the stress caused by the deformation of the leaf spring 160 and increasing the amount of displacement of the leaf spring 160. Furthermore, the leaf spring 160 has approximately the same width in its first plate portion 161, second plate portion 162, and connecting portion 163.

[0022] The first plate portion 161 has its end in contact with the flange portion 113 of the housing 110. In this state, it is fixed to the flange portion 113 by flange bolts 121. On the other hand, the second plate portion 162 has its end in contact with the moving core 150 and is fixed to the moving core 150 by core bolts 122. Therefore, the part fixed to the flange portion 113 by flange bolts 121 becomes the fulcrum of the leaf spring 160, and the part fixed to the moving core 150 by core bolts 122 becomes the point of force application of the leaf spring 160.

[0023] In the example shown in Figure 2, three leaf springs 160 of the same shape are used, and the three leaf springs 160 are arranged point-symmetrically around the central axis of the coil 140 (bobbin 130). The width of the aforementioned slit 164 is less than 1 millimeter, and when the coil 140 is energized, the magnetic flux can jump over the slit 164. The spacing 165 between the three leaf springs 160 is also narrow, less than 1 millimeter, similar to the slit 164. Therefore, even if three leaf springs 160 are used, or if slits 164 are formed in the leaf springs 160, the spacing 165 and the slits 164 prevent the magnetism from becoming saturated.

[0024] Next, the operation of the vibration device 100, which has the above configuration, will be explained. Power is supplied to the coil 140 of the vibration device 100 from a battery (not shown). This power supply is controlled by the control device 210 shown in Figure 7, and is supplied as a square wave of about 50 to 100 Hz with a duty cycle of 50 percent. That is, current flows through the coil 140 for 5 to 10 milliseconds, and then it is de-energized for 5 to 10 milliseconds. This energization and de-energization continues for a period controlled by the control device 210.

[0025] When current is supplied to the coil 140, the coil 140 is excited and a magnetic circuit is created around the coil 140. In this example, the magnetic circuit is formed by the housing 110, the stator core 118, the moving core 150, and the leaf spring 160. Within this magnetic circuit, a magnetic gap is formed between the moving core 150 and the stator core 118, so the moving core 150 is attracted to the stator core 118.

[0026] The leaf spring 160 restricts the movement of the moving core 150 in this process. When the moving core 150 moves toward the stator core 118, the leaf spring 160 undergoes elastic deformation, and the elastic force associated with this deformation biases the moving core 150 in a direction that pulls it back away from the stator core 118. Therefore, even if the moving core 150 is displaced toward the stator core 118, the moving core 150 and the stator core 118 will not collide.

[0027] The elastic deformation of the leaf spring 160 is achieved by bending deformation at the first plate portion 161, torsional deformation at the connecting portion 163, and bending deformation at the second plate portion 162. As described above, by providing the slit 164, even with a leaf spring 160 having a small projected area, sufficient displacement can be obtained for the moving core 150 to move towards the stator core 118. In other words, even if the coil 140 is miniaturized along with the miniaturization of the vibration device 100 and the magnetic force during excitation decreases, the leaf spring 160 can still secure the necessary amount of displacement.

[0028] However, because the width of the slit 164 is narrow, the width of the first plate portion 161, the second plate portion 162, and the connecting portion 163 of the leaf spring 160 is almost the entire projected area of ​​the leaf spring 160. Therefore, even with a small projected area, the leaf spring 160 is able to suppress the moving core 150 from colliding with the stator core 118. In this example, the spring force of the leaf spring 160 is about 10 to 20 N.

[0029] When the coil 140 is energized, the leaf spring 160 also becomes a component that forms the magnetic circuit, so it is desirable to avoid the presence of slits 164 and gaps 165 in the leaf spring 160 if possible. However, in this example, both the slits 164 and gaps 165 are less than 1 millimeter, and as mentioned above, the magnetism does not saturate. Also, in this example, the width of the first plate portion 161, the second plate portion 162, and the connecting portion 163 of the leaf spring 160 is approximately the same, so no restricting points that particularly narrow the magnetic flux are formed inside the leaf spring 160 itself. Therefore, the leaf spring 160 functions effectively as a component that forms the magnetic circuit.

[0030] When the control device 210 terminates the energization of the coil 140, the moving core 150 moves in the direction of being pulled back from the stator core 118 by the elastic force of the leaf spring 160. The moving core 150 reaches a state where the elastic deformation of the leaf spring 160 shown in Figure 4 is zero, and then, due to the moment of inertia of the moving core 150, it displaces further upward than in Figure 4. Due to the movement of the moving core 150 toward the stator core 118 when the coil 140 is energized, and the movement of the moving core 150 in the direction of being pulled back from the stator core 118 when the coil 140 is not energized, the moving core 150 vibrates within the housing 110. In terms of displacement, the moving core 150 vibrates approximately 0.5 to 1 millimeter up and down from the state in Figure 4.

[0031] The vibration of the moving core 150 caused by the energization and de-energization of coil 140 eventually attenuates, but as described above, the control device 210 repeatedly energizes and de-energizes coil 140 at a predetermined frequency. Therefore, the vibration of the moving core 150 continues for the period controlled by the control device 210. The acceleration of the moving core 150 during this time is approximately 10G. When attached to the car seat 200, the vibration is reliably transmitted to the occupant.

[0032] In the example described above, the stator core 118 is formed integrally with the housing 110. This is effective because it reduces the number of components in the stator core 118 and thus the assembly time. However, it is also possible to form the stator core 118 separately from the housing 110 and fix it to the housing 110 with adhesive or bolts.

[0033] Furthermore, in the example described above, the flat plate portion 152 of the housing 110 and moving core 150 was made hexagonal, but other shapes, such as a circular shape as shown in Figure 5, may also be used. This can be changed according to the shape of the area where the vibration device 100 is installed. However, a circular shape as shown in Figure 5 is preferable for manufacturing purposes.

[0034] Furthermore, although three leaf springs 160 were used in the above example, any number of leaf springs 160 is acceptable. Figure 6 shows an example using four leaf springs 160. As shown in Figure 8, an example using two leaf springs 160 is also included. Multiple leaf springs 160 have the same shape for each leaf spring 160. They are then arranged in a balanced manner around the central axis. When there are three or more, they are arranged point-symmetrically with respect to the central axis, as shown in Figures 1, 5, and 6. The example of two leaf springs 160 arranged in Figure 8 is also point-symmetrically with respect to the central axis. However, although not shown in the illustration, when there are two leaf springs 160, it is also possible to arrange them line-symmetrically with respect to a line containing the central axis. In this disclosure, arrangements symmetrical with respect to a line containing the central axis are included in arrangements that are point-symmetrical with respect to the central axis.

[0035] In Figure 6, the leaf spring 160 is generally S-shaped, with a third plate portion 166 formed between the first plate portion 161 and the second plate portion 162. Even in this S-shaped case, the widths of the first plate portion 161, the second plate portion 162, the third plate portion 166, and the connecting portion 163 are approximately the same. By making the leaf spring 160 S-shaped, the amount of displacement of the leaf spring 160 per unit projected area can be further increased.

[0036] The shape of the leaf spring 160 is not related to the number of leaf springs 160. In the example where there are three leaf springs 160 as shown in Figures 1 to 5, or in the example where there are two leaf springs 160 as shown in Figure 8, an S-shaped leaf spring 160 may be used, and conversely, in the example where four leaf springs 160 are used as shown in Figure 6, a J-shaped leaf spring 160 may be used. The shape of the leaf spring 160 is such that a slit 164 is formed between the first plate portion 161 fixed to the housing 110 and the second plate portion 162 fixed to the moving core 150, and other shapes are also included.

[0037] In the example described above, all leaf springs 160 are made of the same shape. This is desirable because it reduces the number of parts and allows for a well-balanced arrangement. However, in this disclosure, "same shape" means that the shapes are roughly identical. This includes cases where there are slight differences in shape among the leaf springs 160 due to requirements such as assembly position. Therefore, in this disclosure, "same shape" means that the shapes are generally consistent. Similarly, "symmetrical around the central axis" means that the balance around the central axis is generally maintained. As long as the balance is not significantly impaired and does not adversely affect the behavior of the vibration device 100, it is included in the "symmetrical around the central axis" of this disclosure.

[0038] In the example described above, the slit 164 was formed to a predetermined width, but the slit 164 may also be made literally as a cut, so that the first plate portion 161 and the second plate portion 162 are in contact with each other across the slit 164. In that case, as shown in Figure 9, it is desirable to form a stress-relieving portion 167, such as a round hole, so that stress does not concentrate at the end of the slit 164.

[0039] In the example described above, each of the leaf springs 160 was fixed to the flange portion 113 of the housing 110 by a flange bolt 121. However, as shown in Figure 10, the outer circumferences 168 of the multiple leaf springs 160 can be made continuous. By making the outer circumferences 168 continuous, it is possible to prevent the multiple leaf springs 160 from becoming separated, and the workability during assembly can be improved.

[0040] Furthermore, by making the outer circumference 168 continuous, it becomes possible to fasten and secure it to the flange portion 113 of the housing 110 using the outer circumference 168. As shown in Figure 11, by fastening the outer circumference 168 to the flange portion 113, it becomes possible to eliminate the flange bolts 121.

[0041] Even when the outer circumference 168 is continuous, various shapes can be used for the leaf spring 160. Figure 12 shows an example where the housing 110 is cylindrical. In this example, the leaf spring 160 has the same J shape as in Figure 5, and three are arranged symmetrically around the central axis. In this example as well, as shown in Figure 13, the outer circumference 168 is crimped and fixed to the flange portion 113 of the housing 110.

[0042] Although not shown in the diagram, it is also possible to connect multiple leaf springs 160 in a continuous manner near the central axis. When multiple leaf springs 160 are connected in a continuous manner near the central axis, it is possible to use only one core bolt 122. In that case, it is possible to connect multiple leaf springs 160 to the moving core 150 with a single core bolt 122.

[0043] In the example described above, the control device 210 was controlled to prevent the moving core 150 from colliding with the stator core 118. This is a desirable control for improving the vibration characteristics of the vibration device 100. Furthermore, by preventing collision, the durability of the vibration device 100 can be increased. However, if necessary, it is permissible to design the device to allow collision between the moving core 150 and the stator core 118. The vibration pattern can be changed depending on whether or not collision occurs. If collision is allowed, it is desirable to coat both the moving core 150 and the stator core 118 with a surface hardening layer.

[0044] In the example described above, the vibration device 100 was installed in the seat 200 of an automobile. The transmission of vibration information from the seat is a desirable use of the vibration device 100. However, the vibration device 100 of this disclosure is not necessarily limited to automobiles. It can also be incorporated into a device carried by a person as a mobile device. Furthermore, even when used in an automobile, there are other uses such as in a horn.

[0045] Furthermore, the materials and sizes described above are merely examples and can be appropriately selected according to the required performance. The disclosures in this specification and drawings are not limited to the exemplary embodiments. The disclosures include the exemplary embodiments and modifications therefrom by those skilled in the art.

[0046] (Disclosure of technical ideas) This specification discloses several technical concepts, as listed in the following paragraphs. Some paragraphs are written in a multiple dependent form, where subsequent paragraphs optionally refer to preceding paragraphs. Furthermore, some paragraphs are written in a multiple dependent form, referring to other multiple dependent forms. These paragraphs written in multiple dependent forms define several technical concepts.

[0047] (Technical thought 1) A coil wound on a cylindrical bobbin and energized by current, This housing holds the coil, A stator core is arranged on the inner circumference of the coil and supported by the housing, A moving core is positioned on the inner circumference of the coil, facing the stator core via a magnetic gap, This includes a leaf spring that is fixed to the moving core and also to the housing, and biases the moving core in a direction that separates it from the stator core. When the coil is energized, the housing, the stator core, the moving core, and the leaf spring form a magnetic circuit. The aforementioned leaf springs are arranged in a plurality of positions symmetrically around the central axis of the coil, and each of the leaf springs is identical in shape to the others. Each of the leaf springs has a slit formed therein that increases the amount of displacement of the leaf spring, and this slit is wide enough for magnetic flux to pass through when the coil is excited.

[0048] (Technical thought 2) The vibration device according to technical concept 1, wherein the spacing between the multiple leaf springs is approximately the same as the width of the slit.

[0049] (Technical Thought 3) The leaf spring has a first plate portion fixed to the housing, a second plate portion fixed to the moving core, and a connecting portion that connects the second plate portion and the first plate portion. The slit is formed between the first plate portion and the second plate portion. This is a vibration device according to technical concept 1 or 2.

[0050] (Technical Thought 4) The vibration device according to technical concept 3, wherein the width of the first plate portion, the width of the second plate portion, and the width of the connecting portion are substantially the same as each other.

[0051] (Technical Thought 5) A vibration device according to any one of technical concepts 1 to 4, wherein the outer circumference of the multiple leaf springs arranged therein, the portions facing the housing, are interconnected.

[0052] (Technical Thought 6) The vibration device according to technical concept 5, wherein the outer circumferences of the multiple leaf springs are wound and fixed to the housing.

Claims

1. A coil wound on a cylindrical bobbin having flanges on both sides and excited by current, This housing holds the coil, A stator core is arranged on the inner circumference of the coil and supported by the housing, A moving core is positioned on the inner circumference of the coil, facing the stator core via a magnetic gap, A leaf spring is fixed to the moving core and also to the housing, and biases the moving core in a direction that separates it from the stator core. The system includes a control device that controls the power supply to the coil to energize or de-energize it. The moving core has a cylindrical portion located on the inner circumference of the bobbin and a flat plate portion facing the flange portion of the bobbin, and the magnetic gap is formed between the cylindrical portion and the stator core. When the control device energizes the coil and energizes the coil, the housing, the stator core, the moving core, and the leaf spring form a magnetic circuit, and the magnetic gap attracts the moving core towards the stator core. When the control device terminates the power supply to the coil and de-energizes it, the elastic force of the leaf spring moves the moving core in the direction of pulling it back from the stator core. When the coil is energized, the moving core moves toward the stator core, and when the coil is not energized, the moving core moves toward being pulled away from the stator core, causing the moving core to vibrate within the housing. The leaf springs are arranged in a plurality of positions symmetrically around the central axis of the coil, and each of the leaf springs is the same shape as the others, and each of the leaf springs has a slit formed therein that increases the amount of displacement of the leaf spring, the width of which the magnetic flux can pass when the coil is excited, the slit suppresses the saturation of the magnetism, the leaf springs forming the slits function as members constituting a magnetic circuit, and when the coil is excited, a magnetic circuit is formed in the housing, the stator core and the moving core, and the magnetic circuit of the moving core is formed in the cylindrical portion and the flat portion of the leaf spring located on the coil side, forming a vibration device.

2. The vibration device according to claim 1, wherein the spacing between the multiple leaf springs is substantially the same as the width of the slit.

3. The leaf spring has a first plate portion fixed to the housing, a second plate portion fixed to the moving core, and a connecting portion that connects the second plate portion and the first plate portion. The slit is formed between the first plate portion and the second plate portion. The vibration device according to claim 1 or 2.

4. The vibration device according to claim 3, wherein the width of the first plate portion, the width of the second plate portion, and the width of the connecting portion are substantially the same as each other.

5. The vibration device according to claim 1, wherein the outer circumferences of the multiple leaf springs arranged therein are interconnected at the portions facing the housing.

6. The vibration device according to claim 5, wherein the outer circumferences of the multiple leaf springs are wound and fixed to the housing.

7. A coil wound on a cylindrical bobbin having flanges on both sides and excited by current, This housing holds the coil, A stator core is arranged on the inner circumference of the coil and supported by the housing, A moving core is positioned on the inner circumference of the coil, facing the stator core via a magnetic gap, A leaf spring is fixed to the moving core and also to the housing, and biases the moving core in a direction that separates it from the stator core. The system includes a control device that controls the power supply to the coil to energize or de-energize it. The moving core has a cylindrical portion located on the inner circumference of the bobbin and a flat plate portion facing the flange portion of the bobbin, and the magnetic gap is formed between the cylindrical portion and the stator core. When the control device energizes the coil and energizes the coil, the housing, the stator core, the moving core, and the leaf spring form a magnetic circuit, and the magnetic gap attracts the moving core towards the stator core. When the control device terminates the power supply to the coil and de-energizes it, the elastic force of the leaf spring moves the moving core in the direction of pulling it back from the stator core. When the coil is energized, the moving core moves toward the stator core, and when the coil is not energized, the moving core moves toward being pulled away from the stator core, causing the moving core to vibrate within the housing. The leaf spring has a space formed therein that relieves the stress caused by the deformation of the leaf spring and increases the amount of displacement of the leaf spring, and this space is wide enough for magnetic flux to pass through when the coil is excited, the space suppresses magnetic saturation, the leaf spring forming the space functions as a component of a magnetic circuit, and when the coil is excited, a magnetic circuit is formed in the housing, the stator core and the moving core, and the magnetic circuit of the moving core is a vibration device formed in the cylindrical portion and the flat portion of the leaf spring located on the coil side.

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