Vibration-type linear actuator

Abstract

The objective is to obtain a vibration-type linear actuator that can reduce size while suppressing performance degradation, or improve performance without changing the size. [Solution] The vibrating linear actuator 10 comprises an electromagnetic core block 20 having an electromagnet 40, and a drive block 50 having a permanent magnet 512 positioned opposite the electromagnet 40 in a first direction, and reciprocating relative to the electromagnetic core block 20 in a second direction intersecting the first direction. The core 41 of the electromagnet 40 is provided with a plurality of magnetic pole portions 412 arranged in the second direction, and the magnetic pole portions 412 include a wound magnetic pole portion 4122 around which a coil 44 is wound, and an unwound magnetic pole portion 4121 around which the coil 44 is not wound. The length of the wound magnetic pole portion 4122 in the third direction intersecting the first and second directions is shorter than the length of the unwound magnetic pole portion 4121 in the third direction.

Description

Technical Field

[0001] The present disclosure relates to a vibration type linear actuator.

Background Art

[0002] Conventionally, as shown in Patent Document 1 below, a vibration type linear actuator including an electromagnetic core block having an electromagnet and a drive block that reciprocates with respect to the electromagnetic core block is known. In this Patent Document 1, the drive block is arranged to face the electromagnet and has a permanent magnet that attracts and repels against the magnetic poles formed by the electromagnet. By doing so, the drive block is relatively reciprocated with respect to the electromagnetic core block by the electromagnetic force of the electromagnet and the permanent magnet.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a vibration type linear actuator, it is preferable to suppress a decrease in performance while reducing the size, or to improve the performance without changing the size.

[0005] Therefore, an object of the present disclosure is to obtain a vibration type linear actuator capable of suppressing a decrease in performance while reducing the size, or improving the performance without changing the size.

Means for Solving the Problems

[0006] A vibrating linear actuator according to one aspect of the present disclosure comprises an electromagnetic core block having an electromagnet, and a drive block disposed opposite the electromagnet in a first direction and having a permanent magnet that attracts and repels the magnetic poles formed by the electromagnet, and reciprocating relative to the electromagnetic core block in a second direction intersecting the first direction, wherein the electromagnet comprises a core and a coil wound around the core, the core comprises a plurality of magnetic pole portions arranged in the second direction, the magnetic pole portions comprising a wound magnetic pole portion around which the coil is wound and an unwound magnetic pole portion around which the coil is not wound, and the length of the wound magnetic pole portion in a third direction intersecting the first and second directions is shorter than the length of the unwound magnetic pole portion in the third direction. [Effects of the Invention]

[0007] According to this disclosure, it is possible to obtain a vibrating linear actuator that can reduce size while suppressing a decrease in performance, or improve performance without changing the size. [Brief explanation of the drawing]

[0008] [Figure 1] This is a perspective view showing an example of a vibrating linear actuator according to an embodiment. [Figure 2] This is a front view showing an example of a vibrating linear actuator according to an embodiment. [Figure 3] This is an exploded perspective view showing an example of a vibrating linear actuator according to an embodiment. [Figure 4] This is a perspective view showing an example of an electromagnet according to an embodiment. [Figure 5] This is a plan view showing an example of an electromagnet according to an embodiment. [Figure 6] This is a perspective view showing an example of a core according to an embodiment. [Figure 7] This is a plan view showing an example of a core according to an embodiment. [Figure 8] This is a schematic perspective view showing an example of a core according to the embodiment, disassembled into individual electrical steel sheets. [Figure 9] It is a perspective view showing an example of an electromagnet according to an embodiment with the coil removed. [Figure 10] It is a plan view showing an example of an electromagnet according to an embodiment with the coil removed. [Figure 11] It is a sectional view taken along the line A-A of FIG. 10. [Figure 12] It is a perspective view showing a first modification example of an electromagnet according to an embodiment. [Figure 13] It is a plan view showing a first modification example of an electromagnet according to an embodiment. [Figure 14] It is a perspective view showing a second modification example of an electromagnet according to an embodiment. [Figure 15] It is a plan view showing a second modification example of an electromagnet according to an embodiment. [Figure 16] It is a perspective view showing a third modification example of an electromagnet according to an embodiment. [Figure 17] It is a plan view showing a third modification example of an electromagnet according to an embodiment. [Figure 18] It is a perspective view showing a modification example of a permanent magnet according to an embodiment.

Embodiments for Carrying Out the Invention

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings. However, a more detailed description than necessary may be omitted. For example, a detailed description of already well-known matters or a redundant description of substantially the same configuration may be omitted.

[0010] Note that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0011] In the following embodiments, the direction in which the core and the permanent magnet face each other will be defined as the Z direction (vertical direction: first direction) for explanation. In the following embodiments, the upper side in the state where the core is located below and the permanent magnet is located above will be defined as the upper side in the vertical direction, and the lower side will be defined as the lower side in the vertical direction for explanation.

[0012] And the direction in which the drive block moves will be defined as the Y direction (left - right direction: second direction) for explanation. Further, the direction intersecting (orthogonal) with the Z direction (vertical direction: first direction) and the Y direction (left - right direction: second direction) will be defined as the X direction (front - back direction: third direction) for explanation.

[0013] (Embodiment) As shown in FIGS. 1 to 3, the vibration - type linear actuator 10 according to the present embodiment includes a stator block 20 as an electromagnetic core block. This stator block 20 includes an electromagnet 40.

[0014] The vibration - type linear actuator 10 also includes a drive block 50 that reciprocates relatively in the Y direction (left - right direction: second direction) with respect to the stator block 20. This drive block 50 is arranged to face the electromagnet 40 in the Z direction (vertical direction: first direction) and has a permanent magnet 512 that attracts and repels the magnetic poles formed by the electromagnet 40. In the present embodiment, the drive block 50 includes a pair of movers 51, and the permanent magnets 512 are respectively arranged on each mover 51. By doing so, the pair of movers 51 function as two magnetic blocks.

[0015] Furthermore, in the present embodiment, the vibration - type linear actuator 10 includes a connecting plate 60 which is a pair of elastic support portions that respectively connect each mover 51 to the stator block 20, and a pair of left - right connecting spring portions 70 that connect between the two movers 51.

[0016] The stator block 20 as an electromagnetic core block has a fixed - side base 30 made of synthetic resin, and the electromagnet 40 is fixed on this fixed - side base 30.

[0017] The electromagnet 40 comprises a core 41 made of a magnetic material, an insulating coil bobbin 43 attached to the core 41, and a coil 44 wound around the core 41 via the coil bobbin 43. In this embodiment, a voltage is periodically applied to the coil 44. Furthermore, each magnetic pole surface 41a of the electromagnet 40 is positioned opposite a pair of permanent magnets 512.

[0018] A pair of movable elements 51, acting as magnetic blocks, are arranged side by side in the X direction (front-to-back direction: third direction) with a gap between them. Each movable element 51 comprises a movable side housing 511 made of synthetic resin, a permanent magnet 512, and a magnetic back yoke 513. A drive element 52 is fixed to the upper surface of each movable side housing 511 by screws or the like. When the vibrating linear actuator 10 is applied as a drive source for an electric razor or the like, an inner blade (not shown) is connected to each drive element 52.

[0019] In this embodiment, each movable element 51 is configured to reciprocate independently in the reciprocating direction (Y direction: left-right direction: second direction) by the bending deformation of a pair of connecting plates 60. Specifically, the permanent magnets 512 of each movable element 51 are positioned opposite the magnetic pole surface 41a of the electromagnet 40 of the stator block 20 via a predetermined gap, connected by each connecting plate 60. At this time, the permanent magnets 512 of the pair of movable elements 51 are positioned with opposite polarity to each other with respect to the magnetic pole surface 41a of the electromagnet 40, and are positioned to receive electromagnetic forces (attractive and repulsive forces) with opposite patterns to each other. In this way, when the electromagnet 40 is energized, the pair of movable elements 51 are subjected to moving forces in opposite directions with respect to the reciprocating direction (Y direction: left-right direction: second direction). The back yoke 513 is positioned on the side of the permanent magnet 512 opposite to the electromagnet 40 side.

[0020] The pair of connecting plates 60, which serve as elastic support parts, are made of synthetic resin and are integrally molded with the movable side housing part 511. In this embodiment, each connecting plate 60 comprises an upwardly extending part 61, a downwardly extending part 62, and an elastic plate part 63 positioned between them.

[0021] A pair of upward extensions 61 are fixed to both ends of the movable housing portion 511, and a pair of downward extensions 62 are connected to the fixed base 30 of the stator block 20. In this way, each movable element 51 is supported in a suspended state by a pair of connecting plates 60. In this embodiment, the elastic plate portion 63 is equipped with two spring plate portions 631 and 632 that are spaced apart and arranged in parallel, and the movable element 51 is moved back and forth in the reciprocating direction (Y direction: left-right direction: second direction) by the deflection deformation of the two spring plate portions 631 and 632.

[0022] The pair of connecting spring sections 70 are made of synthetic resin and are integrally molded with the movable housing section 511 and the connecting plate 60. Each connecting spring section 70 comprises two connecting base sections 71 and a spring piece section 72 that connects the two connecting base sections 71.

[0023] Furthermore, by configuring the vibration-type linear actuator 10 as described above, the pair of movable elements 51 are made to reciprocate with phases that are 180 degrees different.

[0024] Specifically, by periodically applying a voltage to only one side of the electromagnet 40 (either a positive or negative voltage), a magnetic pole is periodically formed on the magnetic pole surface 41a of the electromagnet 40. By periodically forming a magnetic pole on the magnetic pole surface 41a of the electromagnet 40, the electromagnetic force from the electromagnet 40 and the permanent magnet 512 causes a periodic reciprocating force to act on the pair of movable elements 51 in opposite directions in the reciprocating direction (Y direction: left-right direction: second direction). By periodically applying a reciprocating force to the pair of movable elements 51 in opposite directions in the reciprocating direction (Y direction: left-right direction: second direction), the pair of movable elements 51 reciprocate at 180-degree different phases due to the thrust from the electromagnet 40 and the deflection deformation of the springs (a pair of connecting plates 60 and a pair of connecting spring parts 70). In this embodiment, the pair of movable elements 51 move during the forward stroke of the reciprocating motion by the resultant force of the thrust from the electromagnet 40 and the restoring force of the springs (four spring plate sections 631, four spring plate sections 632, and two spring piece sections 72). During the return stroke of the reciprocating motion, the pair of movable elements 51 move by the restoring force of the deformed springs (four spring plate sections 631, four spring plate sections 632, and two spring piece sections 72). At this time, the spring force due to the elastic deformation of the connecting spring section 70 is applied in a direction that restricts the amplitude of both movable elements 51, so that the pair of movable elements 51 reciprocate with a predetermined uniform amplitude while suppressing variations in each amplitude.

[0025] In this embodiment, the goal is to reduce the size of the electromagnet 40 while suppressing a decrease in performance, or to improve performance without changing the size of the electromagnet 40.

[0026] Specifically, the core 41 comprises a base portion 411 positioned below and a magnetic pole portion 412 connected to the base portion 411 so as to rise upward. The multiple magnetic pole portions 412 are arranged to be spaced apart in the reciprocating direction (Y direction: left-right direction: second direction). In this embodiment, three magnetic pole portions 412 are arranged to be spaced apart in the reciprocating direction (Y direction: left-right direction: second direction). The upper surfaces of the three magnetic pole portions 412 form the magnetic pole surface 41a of the core 41.

[0027] Furthermore, in this embodiment, as shown in Figures 4 to 7, the three (or more) magnetic pole portions 412 are provided with a wound magnetic pole portion 4122 around which the coil 44 is wound, and an unwound magnetic pole portion 4121 around which the coil 44 is not wound. Specifically, the magnetic pole portion 412 located in the center in the Y direction (left-right direction: second direction) is a wound magnetic pole portion 4122 around which the coil 44 is wound, and the magnetic pole portions 412 located on both sides in the Y direction (left-right direction: second direction) are unwound magnetic pole portions 4121 around which the coil 44 is not wound.

[0028] Furthermore, the length of the wound magnetic pole portion 4122 in the X direction (front-to-back direction: third direction) is made shorter than the length of the unwound magnetic pole portion 4121 in the X direction (front-to-back direction: third direction).

[0029] This prevents the coil 44 from protruding significantly outward in the X direction (front-to-back direction: third direction) from the core 41 when the coil 44 is wound around the wound pole portion 4122. This reduces the dead space that would otherwise be formed around the electromagnet 40. For example, in the case of a conventional product where the length of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) and the length of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction) are approximately the same, when the coil 44 is wound around the wound pole portion 4122, the coil 44 protrudes significantly outward in the X direction (front-to-back direction: third direction) from the core 41. As a result, a space is formed on both sides of the portion of the coil 44 that protrudes from the core 41 in the Y direction (left-to-right direction: second direction) where the core 41 (unwound pole portion 4121) does not exist.

[0030] In contrast, as in this embodiment, if the length of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction), then the core 41 (unwound pole portion 4121) will be present on both sides of the coil 44 wound around the wound pole portion 4122 in the Y direction (left-to-right direction: second direction). Therefore, if the length of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction), it becomes possible to suppress the dead space that would otherwise be formed around the electromagnet 40.

[0031] Furthermore, by using an electromagnet 40 with this configuration, if the length of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction) is kept the same as conventionally, while the length of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) is made shorter than conventionally, the area of ​​the pole surface 41a of the wound pole portion 4122, whose length in the X direction (front-to-back direction: third direction) is shortened, will be slightly smaller, but the area of ​​the pole surfaces 41a of the pair of unwound pole portions 4121, which have the same length as conventionally, will be the same as conventionally. In this way, the reduction in the area of ​​contact between the core 41 and the permanent magnet 512 can be reduced compared to the case where the length of all pole portions 412 (wound pole portion 4122 and the pair of unwound pole portions 4121) in the X direction (front-to-back direction: third direction) is made shorter than conventionally. Therefore, with the electromagnet 40 according to this embodiment, it is possible to shorten the length of the electromagnet 40 in the X direction (front-to-back direction: third direction) while minimizing the reduction in the opposing area between the core 41 and the permanent magnet 512 compared to the conventional design. In other words, it is possible to reduce the size (length in the X direction) of the vibrating linear actuator 10 while suppressing a decrease in the performance of the vibrating linear actuator 10 (thrust of the drive block 50).

[0032] On the other hand, if the length of the wound magnetic pole section 4122 in the X direction (front-to-back direction: third direction) is kept the same as before, while the length of the unwound magnetic pole section 4121 in the X direction (front-to-back direction: third direction) is made longer than before, the length of the electromagnet 40 in the X direction (front-to-back direction: third direction) can be kept the same as before, while increasing the area of ​​contact between the core 41 and the permanent magnet 512. In this way, the performance of the vibrating linear actuator 10 (thrust of the drive block 50) can be improved without changing the size (length in the X direction) of the vibrating linear actuator 10.

[0033] Thus, with the vibration-type linear actuator 10 according to this embodiment, it is possible to reduce the size (length in the X direction) while suppressing a decrease in performance (thrust of the drive block 50), or to improve performance (thrust of the drive block 50) without changing the size (length in the X direction).

[0034] In this embodiment, as shown in Figure 8, a core 41 is formed by stacking and fixing multiple electromagnetic steel sheets 42 in the X direction (front-to-back direction: third direction). Methods for fixing the stacked electromagnetic steel sheets 42 include fixing with coil bobbins 43, fixing by crimping (dowel lamination), fixing by laser welding (welded lamination), and fixing by adhesive lamination. In this embodiment, the sheets are fixed with coil bobbins 43. It is also possible to fix multiple electromagnetic steel sheets 42 using multiple methods in combination, such as fixing by crimping (dowel lamination) while also fixing with coil bobbins 43.

[0035] In this embodiment, the plurality of electromagnetic steel sheets 42 comprises a first electromagnetic steel sheet 421 and a second electromagnetic steel sheet 422 having a different shape from the first electromagnetic steel sheet 421. That is, the plurality of electromagnetic steel sheets 42 forming the core 41 comprises at least one first electromagnetic steel sheet 421 and at least one second electromagnetic steel sheet 422.

[0036] In this embodiment, the first electromagnetic steel sheet 421 includes a base material 4211 positioned below and constituting a part of the base portion 411, and a magnetic pole material 4212 connected to the base material 4211 so as to rise upward and constituting a part of the magnetic pole portion 412. The second electromagnetic steel sheet 422 also includes a base material 4221 positioned below and constituting a part of the base portion 411, and a magnetic pole material 4222 connected to the base material 4221 so as to rise upward and constituting a part of the magnetic pole portion 412.

[0037] Furthermore, the magnetic pole material 4212 of the first electromagnetic steel sheet 421 comprises a wound magnetic pole material 42122 located in the center in the Y direction (left-right direction: second direction) and constituting a part of the wound magnetic pole portion 4122, and unwound magnetic pole materials 42121 located on both sides in the Y direction (left-right direction: second direction) and constituting a part of the unwound magnetic pole portion 4121. Thus, the first electromagnetic steel sheet 421 has a roughly E-shape when viewed along the X direction (front-back direction: third direction: thickness direction).

[0038] On the other hand, the magnetic pole material 4222 of the second electromagnetic steel sheet 422 is provided with non-wound magnetic pole material 42221 located on both sides in the Y direction (left-right direction: second direction) and constituting part of the non-wound magnetic pole portion 4121, but it is not provided with wound magnetic pole material located in the center in the Y direction (left-right direction: second direction) and constituting part of the wound magnetic pole portion 4122. In this way, the second electromagnetic steel sheet 422 has a roughly C shape when viewed along the X direction (front-back direction: third direction: thickness direction). This ensures that the shape of the second electromagnetic steel sheet 422 is different from that of the first electromagnetic steel sheet 421.

[0039] Furthermore, by stacking multiple electromagnetic steel sheets 42, each comprising at least one first electromagnetic steel sheet 421 and at least one second electromagnetic steel sheet 422, in the X direction (front-to-back direction: third direction), a core 41 is formed in which the length of the wound magnetic pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound magnetic pole portion 4121 in the X direction (front-to-back direction: third direction).

[0040] Thus, in this embodiment, by simply stacking multiple electromagnetic steel sheets 42 of different shapes, a core 41 is formed in which the length of the wound magnetic pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound magnetic pole portion 4121 in the X direction (front-to-back direction: third direction). This makes it easier to form a core 41 in which the length of the wound magnetic pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound magnetic pole portion 4121 in the X direction (front-to-back direction: third direction).

[0041] Furthermore, in this embodiment, a core 41 is formed by stacking multiple first electromagnetic steel sheets 421 in the X direction (front-to-back direction: third direction), and stacking multiple second electromagnetic steel sheets 422 on both sides of the multiple first electromagnetic steel sheets 421 stacked in the X direction (front-to-back direction: third direction) in the X direction (front-to-back direction: third direction).

[0042] In this way, both ends of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) are located further inward in the X direction (front-to-back direction: third direction) than both ends of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction), and a core 41 is formed in which the length of the wound pole portion 4122 in the X direction (front-to-back direction: third direction) is shorter than the length of the unwound pole portion 4121 in the X direction (front-to-back direction: third direction).

[0043] In this embodiment, the number of second electromagnetic steel sheets 422 stacked on one side of the multiple first electromagnetic steel sheets 421 stacked in the X direction (front-to-back direction: third direction) is the same as the number of second electromagnetic steel sheets 422 stacked on the other side. By doing so, as shown in Figure 7, the three (multiple) magnetic pole portions 412 are arranged to be symmetrical with respect to a straight line L1 extending in the Y direction (left-to-right direction: second direction) when viewed from the Z direction (up-down direction: first direction), that is, in a plan view.

[0044] In this way, as in this embodiment, when the drive block 50 is equipped with two movable elements 51, it becomes possible to generate approximately the same thrust for each movable element 51.

[0045] The coil 44 is wound around the wound magnetic pole section 4122 via the coil bobbin 43. The coil bobbin 43 is attached to the wound magnetic pole section 4122 by inserting and fitting the wound magnetic pole section 4122 inside the cylindrical section 431, as shown in Figures 9 to 11.

[0046] Therefore, as in this embodiment, when a core 41 is formed by stacking multiple second electromagnetic steel sheets 422 on both sides of multiple first electromagnetic steel sheets 421 stacked in the X direction (front-to-back direction: third direction) in the X direction (front-to-back direction: third direction), the cylindrical portion 431 of the coil bobbin 43 becomes unable to hold the second electromagnetic steel sheets 422.

[0047] Therefore, in this embodiment, a clamping portion 4331 is formed on the coil bobbin 43 to hold down the electromagnetic steel sheet 42 located at the end in the X direction (front-to-back direction: third direction) and clamp multiple electromagnetic steel sheets 42 together. This ensures that even when a core 41 is formed by laminating electromagnetic steel sheets 42 of different shapes, the electromagnetic steel sheets 42 do not shift position or peel off.

[0048] Specifically, as shown in Figure 11, the coil bobbin 43 comprises a cylindrical portion 431 into which the wound magnetic pole portion 4122 is inserted and fitted, an upper flange 432 connected to the upper end of the cylindrical portion 431, and a lower flange 433 connected to the lower end of the cylindrical portion 431. On both sides of the lower flange 433 in the X direction (front-rear direction: third direction), clamping portions 4331 are formed that contact the base material 4221 of the second electromagnetic steel sheet 422 located at the end in the X direction (front-rear direction: third direction), so that when the coil bobbin 43 is attached to the core 41, the multiple electromagnetic steel sheets 42 constituting the core 41 are clamped by the pair of clamping portions 4331.

[0049] In this way, the second electromagnetic steel sheet 422, which is not held by the cylindrical portion 431, is also held by the coil bobbin 43, thereby more reliably preventing the electromagnetic steel sheet 42 (especially the second electromagnetic steel sheet 422) from shifting position or peeling off.

[0050] Furthermore, the clamping portion 4331 can be formed to extend linearly from one end to the other in the Y direction (left-right direction: second direction), or it can be formed as a dotted line from one end to the other in the Y direction (left-right direction: second direction).

[0051] Furthermore, it is also possible to bring the clamping portion into contact with the non-wound magnetic pole material 42221 of the second electromagnetic steel sheet 422.

[0052] Thus, the clamping portion only needs to be able to hold the second electromagnetic steel sheet 422 that is not held by the cylindrical portion 431, and the contact location, the shape of the contact portion, etc. can be set in various ways.

[0053] Furthermore, the three (or more) magnetic pole sections 412 can be made asymmetrical in a plan view. For example, the center of the wound magnetic pole section 4122 in the X direction (front-to-back direction: third direction) can be shifted to one side relative to the center of the unwound magnetic pole section 4121 in the X direction (front-to-back direction: third direction). In this case, as shown in Figures 12 and 13, it is possible to shift the winding magnetic pole section 4122 so that one end in the X direction (front-to-back direction: third direction) is not aligned with one end in the X direction (front-to-back direction: third direction) of the unwound magnetic pole section 4121, or, as shown in Figures 14 and 15, it is possible to shift the winding magnetic pole section 4122 so that one end in the X direction (front-to-back direction: third direction) is aligned with one end in the X direction (front-to-back direction: third direction) of the unwound magnetic pole section 4121.

[0054] Furthermore, when forming the core 41 shown in Figures 12 and 13 using electromagnetic steel sheets 42, it is possible to form it by stacking a number of first electromagnetic steel sheets 421 stacked in the X direction (front-to-back direction: third direction) and then stacking second electromagnetic steel sheets 422 on both sides of the X direction (front-to-back direction: third direction), while making the number of second electromagnetic steel sheets 422 different on one side and the other side of the X direction (front-to-back direction: third direction).

[0055] Furthermore, when the core 41 shown in Figures 14 and 15 is formed using electrical steel sheets 42, it is possible to form it by laminating the second electrical steel sheet 422 only on one side in the X direction (front-to-back direction: third direction) of a plurality of first electrical steel sheets 421 that are laminated in the X direction (front-to-back direction: third direction).

[0056] Furthermore, the number of magnetic pole portions 412 in the core 41 can be two or three or more. For example, as shown in Figures 16 and 17, the core 41 can have five magnetic pole portions 412.

[0057] In the core 41 shown in Figures 16 and 17, the magnetic pole portions 412 on both sides and in the center in the Y direction (left-right direction: second direction) are unwound magnetic pole portions 4121, and one wound magnetic pole portion 4122 is formed between adjacent unwound magnetic pole portions 4121. A coil 44 is then wound around each of the wound magnetic pole portions 4122.

[0058] Furthermore, it is not necessary to have two permanent magnets 512 facing each other on the core 41; for example, as shown in Figure 18, it is also possible to have one permanent magnet 512 facing the core 41.

[0059] Furthermore, the combination of the number of permanent magnets 512 and the number of wound magnetic pole portions 4122 of the core 41 can be any combination.

[0060] (Note) The above description of embodiments discloses the following technologies.

[0061] (Technology 1) A vibrating linear actuator comprising: an electromagnetic core block having an electromagnet; a drive block positioned opposite the electromagnet in a first direction and having a permanent magnet that attracts and repels the magnetic pole formed by the electromagnet, and reciprocating relative to the electromagnetic core block in a second direction intersecting the first direction, wherein the electromagnet comprises a core and a coil wound around the core, the core comprises a plurality of magnetic pole portions arranged in the second direction, the magnetic pole portions comprising a wound magnetic pole portion around which the coil is wound and an unwound magnetic pole portion around which the coil is not wound, and the length of the wound magnetic pole portion in a third direction intersecting the first and second directions is shorter than the length of the unwound magnetic pole portion in the third direction.

[0062] Thus, in the vibration-type linear actuator of Technology 1, the length of the wound magnetic pole portion in the third direction is made shorter than the length of the unwound magnetic pole portion in the third direction.

[0063] This prevents the coil from protruding too far outward in a third direction from the core when the coil is wound around the magnetic pole. This helps to reduce the dead space that would otherwise form around the electromagnet.

[0064] Therefore, by keeping the length of the non-wound pole section in the third direction the same as before, while shortening the length of the wound pole section in the third direction compared to before, it is possible to shorten the length of the electromagnet in the third direction while minimizing the reduction in the area of ​​contact between the core and the permanent magnet compared to before. In this way, it becomes possible to reduce the size (width in the third direction) of the vibrating linear actuator while suppressing a decrease in the performance of the vibrating linear actuator.

[0065] Furthermore, by keeping the length of the wound magnetic pole section in the third direction the same as before, while increasing the length of the unwound magnetic pole section in the third direction, the opposing area between the core and the permanent magnet can be increased while keeping the length of the electromagnet in the third direction the same as before. In this way, the performance of the vibrating linear actuator can be improved without changing the size (width in the third direction) of the vibrating linear actuator.

[0066] Thus, using the vibration-type linear actuator of Technology 1 makes it possible to reduce the size while suppressing a decrease in performance, or to improve performance without changing the size.

[0067] (Technology 2) The vibration-type linear actuator according to Technology 1, wherein the core comprises a plurality of electromagnetic steel sheets, the electromagnetic steel sheets comprising a first electromagnetic steel sheet and a second electromagnetic steel sheet having a different shape from the first electromagnetic steel sheet, and the first electromagnetic steel sheet and the second electromagnetic steel sheet are stacked in the third direction.

[0068] This method allows for the formation of a core where the length of the wound pole portion in the third direction is shorter than the length of the unwound pole portion in the third direction, simply by laminating electromagnetic steel sheets of different shapes. Therefore, it becomes easier to form a core where the length of the wound pole portion in the third direction is shorter than the length of the unwound pole portion in the third direction.

[0069] (Technical 3) The vibration-type linear actuator according to Technical 2, wherein the electromagnet comprises a coil bobbin attached to the core, and the coil bobbin has a clamping portion formed thereon that presses down on the electromagnetic steel plate located at the end in the third direction and clamps a plurality of the electromagnetic steel plates.

[0070] This method makes it possible to more reliably prevent the electromagnetic steel sheets from shifting position or peeling off, even when forming a core by laminating electromagnetic steel sheets of different shapes.

[0071] (Technology 4) A vibrating linear actuator according to any one of the technologies 1 to 3, wherein the plurality of magnetic pole portions are formed to be symmetric with respect to a straight line extending in the second direction when viewed from the first direction.

[0072] This allows the drive block to generate approximately equal thrust for each of the two movable elements.

[0073] [others] The above describes the details of the vibration-type linear actuator described herein, but it will be obvious to those skilled in the art that the invention is not limited to these descriptions and that various modifications and improvements are possible.

[0074] For example, this disclosure can be applied to embodiments in which the configuration shown in the above embodiments is modified, replaced, added, or omitted. Furthermore, it is possible to combine the components described in the above embodiments and their variations to create new embodiments.

[0075] Furthermore, although the above embodiment illustrates a core 41 formed by stacking and fixing multiple electromagnetic steel sheets 42 in the X direction (front-to-back direction: third direction), it is also possible to form the core 41 using a powdered magnetic core.

[0076] Furthermore, the specifications of the electromagnetic core block, drive block, and other detailed components (shape, size, layout, etc.) can be modified as needed. [Industrial applicability]

[0077] As described above, the vibration-type linear actuator described herein can be used in various cutting devices, including those for home and commercial use, because it is possible to reduce the size while suppressing a decrease in performance, or to improve performance without changing the size. [Explanation of Symbols]

[0078] 10. Vibration-type linear actuator 20 Stator Block (Electromagnetic Core Block) 40 Electromagnets 41 cores 412 Magnetic pole part 4121 Non-wound magnetic pole section 4122 Winding Magnetic Pole Section 42 Electrical steel sheet 43 Coil Bobbin 4331 Clamping part 44 coils 50 Drive Block 512 Permanent Magnet

Claims

1. An electromagnetic core block having an electromagnet, A drive block is positioned opposite the electromagnet in a first direction and has a permanent magnet that attracts and repels the magnetic pole formed by the electromagnet, and moves reciprocally relative to the electromagnetic core block in a second direction intersecting the first direction, Equipped with, The electromagnet comprises a core and a coil wound around the core, The core comprises a plurality of magnetic pole portions arranged in the second direction, The magnetic pole portion comprises a wound magnetic pole portion around which the coil is wound, and an unwound magnetic pole portion around which the coil is not wound. The length of the wound magnetic pole portion in the third direction intersecting the first and second directions is shorter than the length of the unwound magnetic pole portion in the third direction. Vibration-type linear actuator.

2. The core comprises a plurality of electrical steel sheets, The aforementioned electrical steel sheet comprises a first electrical steel sheet and a second electrical steel sheet having a different shape from the first electrical steel sheet. The first electrical steel sheet and the second electrical steel sheet are stacked in the third direction. The vibration-type linear actuator according to claim 1.

3. The electromagnet comprises a coil bobbin attached to the core, The coil bobbin has a clamping portion formed therein that holds down the electromagnetic steel sheet located at the end in the third direction and clamps a plurality of the electromagnetic steel sheets. The vibration-type linear actuator according to claim 2.

4. The plurality of magnetic pole portions are formed such that, when viewed from the first direction, they are symmetrical with respect to a straight line extending in the second direction. A vibrating linear actuator according to any one of claims 1 to 3.

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