JP5838799B2 - Vibration generator and method of manufacturing vibration generator - Google Patents

Description

  The present invention relates to a vibration generator that generates electric power by vibration and a method for manufacturing the vibration generator.

  Conventionally, vibration generators that convert kinetic energy caused by vibration into electrical energy have been proposed. In such a vibration power generator, for example, the permanent magnet vibrates in the bobbin around which the coil is wound, so that an induced current accompanying a change in magnetic flux is generated in the coil. Can be supplied to an external load (see, for example, Patent Document 1).

JP 2006-296144 A

  In a vibration power generator, a lubricant may be provided between the bobbin and the permanent magnet in order to reduce friction between the bobbin and the permanent magnet during vibration. Here, when the vibration of the permanent magnet is repeated, the lubricant in the central portion of the bobbin gradually moves to both sides of the bobbin, and finally the lubricant is unevenly distributed on both ends of the bobbin. In this case, the lubricant in the central part of the bobbin is reduced, and the frictional force between the permanent magnet and the bobbin is increased in this part. Accordingly, there is a problem that the permanent magnet is difficult to move in the bobbin and the power generation efficiency of the vibration generator is lowered, and at the same time, the bobbin generates heat due to friction and the reliability of the vibration generator is lowered.

  An object of the present invention is to provide a vibration generator that can suppress a decrease in power generation efficiency and reliability by continuously moving a permanent magnet in a bobbin, and a method of manufacturing the vibration power generator.

The vibration generator according to the first aspect of the present invention is a bobbin provided with an inner wall having a coil and a cylindrical member around which the coil is wound, and extending in a direction intersecting the cylindrical axial direction. And a permanent magnet provided in the bobbin so as to be capable of reciprocating in the axial direction. A plurality of adjacent divided bobbins, wherein the groove portion is provided at an end portion where the divided bobbin and the other divided bobbin are close to each other, and a lubricant is applied to at least a part of the inner wall of the bobbin. Features.

According to the first aspect, the vibration generator can store the lubricant provided between the bobbin and the permanent magnet in the groove provided on the inner wall. For this reason, it can be prevented that the lubricant moves to both sides of the bobbin and the lubricant is unevenly distributed on both sides of the bobbin in the process in which the permanent magnet vibrates in the axial direction in the bobbin. Therefore, the vibration generator can supply the lubricant to the entire inner wall of the bobbin, and can smoothly vibrate the permanent magnet in the bobbin. As a result, the power generation efficiency and reliability of the vibration power generator can be maintained. Moreover, since the bobbin has a structure in which the divided bobbins are arranged in the axial direction, it is possible to easily form a bobbin having a large axial length and a thin peripheral wall. Moreover, since each of the plurality of divided bobbins is provided with a groove portion at an end portion close to each other, the groove portion can be easily formed.

1st aspect WHEREIN: The said groove part may be orthogonally crossed with the said axial direction, and may be provided in the axial direction approximate center of the said bobbin. Thus, the lubricant it means to be accumulated in the axial direction substantial center of the bobbin, can be supplied substantially uniformly lubricant throughout the inner wall of the ball bins.

  1st aspect WHEREIN: The internal diameter of the edge part which adjoins the said other division | segmentation bobbin among the said division | segmentation bobbins may be larger than the internal diameter of the part except the said edge part. By bringing the divided bobbins close to each other, a groove portion can be automatically formed in a proximity portion between the divided bobbin and another divided bobbin. For this reason, the vibration generator can form a groove part more easily. Further, the shape of the groove can be easily controlled by adjusting the shape of the end of the divided bobbin.

  1st aspect WHEREIN: A taper shape may be sufficient as the edge part which adjoins the said other division | segmentation bobbin among the said division | segmentation bobbins. By bringing the divided bobbins close to each other, a groove portion can be automatically formed in a proximity portion between the divided bobbin and another divided bobbin. For this reason, the vibration generator can form a groove part more easily. Further, the shape of the groove can be easily controlled by adjusting the shape of the end of the divided bobbin. Furthermore, since the rigidity of the end portion of the divided bobbin is increased, the rigidity of the entire bobbin can be increased.

  In the first aspect, an elastic body may be provided between the divided bobbin and the other divided bobbin. Adhesion between the divided bobbins can be enhanced by bringing the divided bobbins close to each other with the elastic body interposed therebetween. As a result, the lubricant can be prevented from leaking out of the bobbin in the vicinity of the divided bobbins. Furthermore, the size of the groove can be controlled by the elastic material of the elastic body and the size of the elastic material.

  1st aspect WHEREIN: You may provide the fitting part fitted to the said other division | segmentation bobbin in the edge part which adjoins the said other division | segmentation bobbin among the said division | segmentation bobbins. Thereby, the adhesion between the divided bobbins can be enhanced. As a result, the lubricant can be prevented from leaking out of the bobbin in the vicinity of the divided bobbins.

The method of manufacturing a vibration generator according to the second aspect of the present invention is a cylindrical member having an outer diameter smaller than the inner diameter of the guide member, and the coil is wound inside the guide member which is a cylindrical member. A first insertion step of sequentially inserting the plurality of divided bobbins in an orientation in which the axial direction of the guide member and the axial direction of the divided bobbins coincide with each other, and a second insertion for inserting a permanent magnet into the divided bobbins A step of contacting the plurality of divided bobbins inserted into the guide member by the first insertion step, and forming a bobbin in which the divided bobbins are arranged in the axial direction. by the plurality of divided bobbins are in contact, said a inner wall of the bobbin, and an end portion of the split bobbin and the other of said split bobbin is close, grooves extending in a direction crossing the axial direction It is provided.

  According to the second aspect, the vibration generator can easily produce the bobbin by arranging a plurality of divided bobbins in the guide member and bringing the divided bobbins into contact with each other. Thereby, a bobbin with a thin wall thickness can be easily manufactured. Therefore, the power generation efficiency of the vibration power generator can be increased by shortening the distance between the coil and the permanent magnet.

Further, the vibration generator can store the lubricant provided between the bobbin and the permanent magnet in the groove provided on the inner wall. For this reason, it can be prevented that the lubricant moves to both sides of the bobbin and the lubricant is unevenly distributed on both sides of the bobbin in the process in which the permanent magnet vibrates in the axial direction in the bobbin. Therefore, the vibration generator can supply the lubricant to the entire inner wall of the bobbin, and can smoothly vibrate the permanent magnet in the bobbin. As a result, the power generation efficiency and reliability of the vibration power generator can be maintained.

1 is a cross-sectional view of a vibration generator 1. 5 is a diagram for explaining a manufacturing process of the vibration power generator 1. FIG. 5 is a diagram for explaining a manufacturing process of the vibration power generator 1. FIG. 5 is a diagram for explaining a manufacturing process of the vibration power generator 1. FIG. It is sectional drawing which shows the termination | terminus parts 13 and 23 in a 1st modification. It is sectional drawing which shows the termination | terminus parts 13 and 23 in a 2nd modification.

  A vibration generator 1 according to an embodiment of the present invention will be described with reference to FIG. The horizontal direction in FIG. 1 is defined as the horizontal direction of the vibration generator 1. The vibration generator 1 includes a housing 2. The shape of the housing 2 is a cylindrical shape. The axial direction of the housing 2 faces the left-right direction. One end of the housing 2 is closed and the other end is open. The casing 2 has a closed end portion directed to the left side and an open end portion directed to the right side. A lid 3 is attached to the opening at the other end of the housing 2. When the lid 3 covers the opening, the inside of the housing 2 is sealed. The units 10 and 20 are accommodated in the housing 2. The units 10 and 20 have the same shape. The units 10 and 20 are arranged in the axial direction of the housing 2.

  The unit 10 will be described. The unit 10 includes a bobbin 11, a lid part 12, and a terminal part 13. The shape of the bobbin 11 is a cylindrical shape. The outer diameter of the bobbin 11 is approximately half of the inner diameter of the housing 2. The length of the bobbin 11 in the axial direction is substantially half of the length of the housing 2 in the axial direction. The axial direction of the bobbin 11 faces the same direction as the axial direction of the housing 2.

  Both ends of the bobbin 11 are open. A lid 12 is attached to the opening at one end of the bobbin 11. The lid 12 covers the opening. The shape of the lid portion 12 is a cylindrical shape. The outer diameter of the lid portion 12 is slightly smaller than the inner diameter of the housing 2. The axial direction of the lid portion 12 faces the same direction as the axial direction of the bobbin 11. The lid portion 12 includes a hole 12 </ b> A on the side close to the bobbin 11. The inner diameter of the hole 12A is the same as the inner diameter of the bobbin 11. The inner wall 11A of the bobbin 11 and the inner wall of the hole 12A of the lid portion 12 communicate with each other without a step.

  An end portion 13 is attached to the opening at the other end of the bobbin 11. The shape of the terminal portion 13 is a cylindrical shape. The outer diameter of the terminal portion 13 is slightly smaller than the inner diameter of the housing 2. The axial direction of the end portion 13 faces the same direction as the axial direction of the bobbin 11. The end portion 13 includes a through hole 15 extending in the axial direction. The inner diameter of the through hole 15 is the same as the inner diameter of the bobbin 11. The inner wall 11A of the bobbin 11 and the inner wall 15A of the through hole 15 of the terminal end portion 13 communicate with each other without a step. Of the inner wall 15A of the through hole 15, an inclined portion 15B that extends linearly toward the outer peripheral direction is provided at the end of the bobbin 11 opposite to the side in contact with the inner wall 11A. The inner diameter of the portion of the inclined portion 15B of the through hole 15 is larger than the inner wall of the inner wall 15A other than the inclined portion 15B in the through hole 15. The end portion 13 is tapered at the inclined portion 15B.

  Three extending portions 11 </ b> B are provided on the outer wall of the bobbin 11. The extending portion 11 </ b> B extends from the outer wall of the bobbin 11 toward the outer peripheral direction. The extending portions 11B are arranged in the axial direction at equal intervals, and divide the outer wall of the bobbin 11 into four equal parts in the axial direction. A coil 14 is wound around each of the outer walls of the bobbin 11 divided into four equal parts. The coil 14 is wound so that the winding direction with the other coil 14 wound on the adjacent outer wall is opposite. A rectifier (not shown) is connected to the coil 14.

  The unit 20 will be described. The unit 20 includes a bobbin 21, a lid part 22, and a terminal part 23. Three extending portions 21 </ b> B are provided on the outer wall of the bobbin 21. A coil 24 is wound around each of the outer walls of the bobbin 21 divided into four equal parts by the extending portion 21B. The lid portion 22 includes a hole 22A. The end portion 23 includes a through hole 25. An inclined portion 25 </ b> B is provided on the inner wall 25 </ b> A of the through hole 25. The shape of the unit 20 is the same as that of the unit 10.

  The units 10 and 20 are accommodated in the housing 2 in a state of being aligned in the axial direction. The lid 12 of the unit 10 is close to the closed end of the housing 2. The terminal portion 13 of the unit 10 is close to the approximate center in the axial direction in the housing 2. The lid portion 22 of the unit 20 is close to the lid portion 3 attached to the open end of the housing 2. The terminal portion 23 of the unit 20 is close to the approximate center of the housing 2 in the axial direction. The units 10 and 20 have different axial directions.

  When the lid 3 pushes the unit 20 toward the unit 10, the units 10 and 20 are sandwiched between the closed end of the housing 2 and the lid 3. As a result, the end portion 13 of the unit 10 and the end portion 23 of the unit 20 are in close contact with each other. The units 10 and 20 are integrated. The inner walls 11A, 15A, (inclined part 15B), (inclined part 25B), 25A, 21A form a single hollow part 41 extending in the axial direction. The end in the axial direction of the hollow portion 41 is closed by the lid portions 12 and 22. The inclined portions 15B and 25B form a groove portion 42. The groove 42 is annular. The groove part 42 extends in a direction orthogonal to the axial direction of the hollow part 41. The groove portion 42 is provided in a proximity portion between the units 10 and 20. Further, since the lengths in the axial direction of the units 10 and 20 are the same, the groove portion 42 is positioned at the center in the axial direction of the hollow portion 41. The inner diameter of the groove part 42 is larger than the inner diameter of the other part of the hollow part 41.

  A permanent magnet 31 is provided in the hollow portion 41. The shape of the permanent magnet 31 is a cylindrical shape. The outer diameter of the permanent magnet 31 is slightly smaller than the inner diameter of the bobbins 11 and 21. The permanent magnet 31 is magnetized in the axial direction. The magnetization direction of the permanent magnet 31 faces the axial direction of the hollow portion 41. The N pole of the permanent magnet 31 faces the closed end of the housing 2. The south pole of the permanent magnet faces the open end side (the side on which the lid 3 is attached) of the housing 2. The length of the permanent magnet 31 in the axial direction is substantially the same as the length between the extending portions 11B and the length between 21B. The permanent magnet 31 can reciprocate in the axial direction in the hollow portion 41.

  The lubricant 51 is applied to at least a part of the inner wall (the inner walls 11A, 15A, 25A, and 21A) of the hollow portion 41. The lubricant 51 reduces the frictional force generated between the permanent magnet 31 and the hollow portion 41 when the permanent magnet 31 reciprocates in the hollow portion 41.

  The power generation operation of the vibration power generator 1 will be described with reference to FIG. The user vibrates the vibration generator 1 so that the housing 2 vibrates in the axial direction. Kinetic energy is applied to the housing 2. Kinetic energy is transmitted to the permanent magnet 31 through a frictional force between the permanent magnet 31 and the inner wall of the hollow portion 41 and a force with which the permanent magnet 31 collides with the lid portions 12 and 22. The permanent magnet 31 reciprocates in the hollow portion 41 in the axial direction. The permanent magnet 31 enters and exits the space covered with the coils 14 and 24. When passing through the space in the coils 14 and 24, the magnetic flux generated by the permanent magnet 31 intersects the coils 14 and 24. As a result, an induced current is generated in the coils 14 and 24. As the permanent magnet 31 repeatedly enters and leaves the space in the coils 14 and 24, an alternating current is generated in the coils 14 and 24.

  The alternating current generated in the coils 14 and 24 is transmitted to a rectifier (not shown) via wiring connected to each of the coils 14 and 24. The rectifier performs full-wave rectification of alternating current. The current rectified by the rectifier is converted to a constant voltage by a constant voltage circuit (not shown) and then output to the outside through an electrode (not shown). The current output to the outside is supplied to the load of the external device. The external device is driven by the supplied current.

  Since the lubricant 51 is applied to at least a part of the hollow portion 41 (inner walls 11A, 15A, 25A, 21A), the permanent magnet 31 smoothly reciprocates in the hollow portion 41. The lubricant 51 accumulates in the groove 42 in the process in which the permanent magnet 31 reciprocates in the axial direction. Further, the lubricant 51 accumulated in the groove portion 42 is supplied to the inner wall of the hollow portion 41 in the process in which the permanent magnet 31 reciprocates in the axial direction. Since the groove portion 42 is located at the center in the axial direction of the hollow portion 41, the lubricant 51 spreads over the entire inner wall of the hollow portion 41. Therefore, the permanent magnet 31 smoothly reciprocates in the entire hollow portion 41 by the lubricant 51 attached to the entire inner wall of the hollow portion 41. As described above, the groove portion 42 can prevent the lubricant 51 from being unevenly distributed at the end portion in the axial direction of the hollow portion 41. For this reason, the vibration generator 1 can maintain the power generation efficiency and the reliability in a good state even when the permanent magnet 31 repeatedly moves back and forth.

  A method for manufacturing the vibration generator 1 will be described with reference to FIGS. A housing 2, units 10 and 20, and a lid 3 are prepared. As shown in FIG. 2, the permanent magnet 31 is accommodated in the bobbin 11 of the unit 10 (arrow 5). The unit 10 in which the permanent magnet 31 is accommodated is inserted into the housing 2 (arrow 6). The unit 10 is inserted from the open end of the housing 2 in a direction in which the lid 12 is close to the closed end of the housing 2. The unit 10 moves in the housing 2 and is disposed in the vicinity of the closed end of the housing 2.

  Next, as shown in FIG. 3, the unit 20 is inserted into the housing 2 (arrow 7). The unit 20 is inserted from the open end of the housing 2 such that the lid 22 is close to the open end of the housing 2. The unit 20 moves in the housing 2 and is arranged next to the unit 10. The terminal portion 13 of the unit 10 and the terminal portion 23 of the unit 20 are in close proximity. Since the outer diameters of the lid parts 12 and 22 and the terminal parts 13 and 23 are slightly smaller than the inner diameter of the housing 2, the units 10 and 20 are arranged substantially in a straight line without being displaced in the axial direction. The housing 2 functions as a guide member for aligning the units 10 and 20 in a straight line without shifting in the axial direction.

  Next, as shown in FIG. 4, the lid 3 is attached to the open end of the housing 2 (arrow 8). By attaching the lid 3, the unit 20 is pushed toward the unit 10. The units 10 and 20 are sandwiched between the closed end of the housing 2 and the lid 3. As a result, the end portion 13 of the unit 10 and the end portion 23 of the unit 20 are in close contact with each other. A hollow portion 41 is formed by the inner walls 11A, 15A, 25A, and 21A. A groove portion 42 is formed by the inclined portions 15B and 25B. The groove part 42 extends in a direction orthogonal to the axial direction of the hollow part 41. The groove part 42 is located in the center of the hollow part 41 in the axial direction.

  As described above, in the vibration power generator 1, the hollow portion 41 is formed by combining the plurality of units 10 and 20 side by side in the axial direction. As a result, the axial lengths of the bobbins 11 and 21 included in the units 10 and 20 can be made shorter than the axial length of the hollow portion 41 to be finally formed. Generally, it is preferable that the bobbins 11 and 21 are thin. The reason is that the shorter the distance between the permanent magnet 31 and the coils 14 and 24, the larger the induced current generated in the coils 14 and 24 when the permanent magnet 31 is reciprocated, and the better the power generation efficiency. On the other hand, it is difficult to accurately manufacture the bobbins 11 and 21 that are thin and long in the axial direction because of restrictions on workability. On the other hand, in the present invention, a plurality of bobbins 11 and 21 can be integrated by aligning them in the axial direction to form a bobbin that is long in the axial direction. As a result, the axial lengths of the plurality of bobbins 11 and 21 can be shortened, so that a thin bobbin can be easily manufactured.

  Further, by providing the inclined portions 15B and 25B at the end portions 13 and 23, the groove portions 42 can be formed at the contact portions when the end portions 13 and 23 come into contact with each other when the units 10 and 20 are close to each other. Usually, it is difficult to insert a tool into the hollow portion 41 to form a groove due to workability limitations. On the other hand, in the present invention, the groove 42 can be easily formed on the inner wall of the hollow portion 41. Furthermore, the groove part 42 from which a shape differs can be easily created by adjusting the shape of inclination part 15B, 25B.

  Moreover, the edge part on the opposite side to the side which contacts the bobbins 11 and 21 among the termination | terminus parts 13 and 23 becomes a taper shape by forming the inclination parts 15B and 25B. For this reason, the rigidity of the end portions of the end portions 13 and 23 of the end portions 13 and 23 is compared with the case where the end portion on the opposite side to the side in contact with the bobbins 11 and 21 is bent outward to form the inclined portion. Is maintained in a strong state. Thereby, durability of the vibration generator 1 can be improved.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. Hereinafter, modified examples (first modified example and second modified example) of the present invention will be described.

  A first modification of the present invention will be described with reference to FIG. In the first modification, a recess 16 is provided on the end surface of the terminal portion 13 included in the unit 10 (see FIG. 1) on the side opposite to the side surface in contact with the bobbin 11. The recess 16 is provided in an annular shape so as to surround the through hole 15 from the outside. Moreover, the recessed part 26 is provided in the end surface on the opposite side to the side surface which contacts the bobbin 21 among the termination | terminus parts 23 with which the unit 20 (refer FIG. 1) is provided. The recess 26 is provided in an annular shape so as to surround the through hole 25 from the outside. When the units 10 and 20 are close to each other, the recesses 16 and 26 are arranged to face each other.

  An elastic body 43 is provided between the recesses 16 and 26 in a state where the units 10 and 20 are close to each other. The shape of the elastic body 43 is annular. The diameter of the elastic body 43 is the same as the diameter of the recesses 16 and 26. The elastic body 43 is deformed by being sandwiched from both sides by the recesses 16 and 26 and fits into the recesses 16 and 26. As a result, the elastic body 43 is in close contact with the end portions 13 and 23. The elastic body 43 prevents the lubricant 51 (see FIG. 1) applied to the inner wall of the hollow portion 41 from leaking out of the hollow portion 41 through the gap between the terminal portions 13 and 23. An O-ring can be used as the elastic body 43.

  As described above, in the first modification, the elastic body 43 is provided between the terminal portions 13 and 23. Thereby, the closeness of the units 10 and 20 can be improved by bringing the end portions 13 and 23 close to each other with the elastic body 43 interposed therebetween. Therefore, the lubricant 51 can be prevented from leaking out of the hollow portion 41 from the gap between the end portions 13 and 23.

  Further, the lubricant 51 can be stored in the gap 44 between the end portions 13 and 23 formed by the elastic body 43 being sandwiched between the end portions 13 and 23. The gap 44 functions as a part of the groove 42. Therefore, the lubricant 51 applied to the inner wall of the hollow portion 41 can be stored more efficiently.

  In the first modification described above, the recesses 16 and 26 may not be provided. An elastic body 43 may be sandwiched between the end portions 13 and 23.

  A second modification of the present invention will be described with reference to FIG. In the second modified example, a convex portion 17 is provided on an end surface of the terminal portion 13 included in the unit 10 (see FIG. 1) on the side opposite to the side surface in contact with the bobbin 11. The convex portion 17 is provided in an annular shape so as to surround the through hole 15 from the outside. Moreover, the recessed part 27 is provided in the end surface opposite to the side surface which contacts the bobbin 21 among the termination | terminus parts 23 with which the unit 20 (refer FIG. 1) is provided. The recess 27 is provided in an annular shape so as to surround the through hole 25 from the outside. When the units 10 and 20 are close to each other, the convex portion 17 and the concave portion 27 are arranged to face each other, and the convex portion 17 is fitted into the concave portion 27. By fitting the convex portion 17 and the concave portion 27, the end portions 13 and 23 are in close contact with each other. For this reason, the lubricant 51 applied to the inner wall of the hollow portion 41 can be prevented from leaking out of the hollow portion 41 through the gap between the terminal portions 13 and 23.

  As described above, in the second modification, the convex portion 17 is provided at the terminal end portion 13 and the concave portion 27 is provided at the terminal end portion 23. By fitting the convex portion 17 and the concave portion 27, the adhesion at the end portions 13 and 23 can be enhanced. Therefore, the lubricant 51 can be prevented from leaking out of the hollow portion 41 from the gap between the end portions 13 and 23.

  In the above-described embodiments and modifications, the end portions 13 and 23 are brought into close contact with each other by sandwiching the units 10 and 20 from both sides. On the other hand, the termination | terminus parts 13 and 23 may be adhere | attached with an adhesive agent. Moreover, you may adhere | attach the termination | terminus parts 13 and 23 by fastening with a clip from outer periphery. Further, one of the terminal portions 13 and 23 may be provided with a male screw, and the other may be provided with a female screw. The end portions 13 and 23 may be brought into close contact with screws.

  In the above-described embodiments and modifications, the end portions 13 and 23 provided on the bobbins 11 and 21 are brought into contact with each other, and both are brought into close contact with each other, and the groove portion 42 is formed in the contact portion. In contrast, the present invention may be configured not to include the terminal portions 13 and 23. Tapered portions for forming grooves are directly provided at the end of the bobbin 11 opposite to the side where the lid 12 is attached and the end of the bobbin 21 opposite to the side where the lid 22 is attached. May be. And the hollow part 41 may be formed by making the bobbins 11 and 21 contact, and a groove part may be formed in a contact part by a taper part. Moreover, the edge part on the opposite side to the side in which the cover part 12 is attached among the bobbins 11, and the edge part on the opposite side to the side in which the cover part 22 is attached among the bobbins 21 may be bent outward. . And the hollow part 41 may be formed by making the bobbins 11 and 21 contact, and a groove part may be formed in a contact part by a bending part.

  The shapes of the inclined portion 15B provided in the through hole 15 of the end portion 13 and the inclined portion 25B provided in the through hole 25 of the end portion 23 are not limited to the above-described embodiments and modifications. For example, the inclined portions 15B and 25B may extend in a curved shape toward the outer peripheral direction, or may be provided with a step.

  In the above-described embodiment and modification, the number of units is two, but may be three or more. The length in the axial direction of the unit may be the same or different for each unit. The position where the groove portion 42 is formed may be a portion other than the center in the axial direction of the hollow portion 41. The groove portion 42 may be provided in advance in the bobbins 11 and 21. The number of the groove portions 42 may be two or more. The extending direction of the groove part 42 is not limited to the direction orthogonal to the axial direction, and it is sufficient that it intersects the axial direction. However, considering the purpose of suppressing uneven application of lubricant on the inner wall surfaces of the bobbins 11 and 21, and the ease of manufacturing and assembling of the bobbins 11 and 21, the groove 42 is substantially orthogonal to the axial direction. It is preferable.

  The shapes of the housing 2 and the bobbins 11 and 21 are not limited to a cylindrical shape. The shapes of the housing 2 and the bobbins 11 and 21 may be other polygonal cylinders such as an elliptical cylinder and a square cylinder, for example. As long as the material of the housing | casing 2 is a nonmagnetic material, metals, such as copper, aluminum, and brass, may be sufficient as magnetic materials, such as iron and stainless steel. The shape of the permanent magnet 31 is not limited to a cylindrical shape, but preferably has the same cross-sectional shape as the bobbins 11 and 21.

  The bobbins 11 and 21 constituting the units 10 and 20 correspond to “divided bobbins” of the present invention, and the bobbins 11 and 21 in an integrated state correspond to “bobbins” of the present invention. 2 and 3, the step of inserting the units 10 and 20 into the housing 2 corresponds to the “first insertion step” of the present invention, and the step of inserting the permanent magnet 31 into the unit 10 is the “first insertion step” of the present invention. This corresponds to “two insertion steps”. In FIG. 4, the process of bringing the units 10 and 20 into close contact with each other by attaching the lid 3 corresponds to the “forming process” of the present invention. The housing 2 corresponds to the “guide member” of the present invention.

DESCRIPTION OF SYMBOLS 1 Vibration generator 2 Case 10, 20 Unit 11, 21 Bobbin 13, 23 Termination part 14, 24 Coil 15B, 25B Inclination part 16, 26, 27 Concave part 17 Protrusion part 31 Permanent magnet 41 Hollow part 42 Groove part 43 Elastic body 51 lubricant

Claims (7)

Coils,
A cylindrical member around which the coil is wound, and a bobbin provided with an inner wall having a groove extending in a direction intersecting the cylindrical axial direction;
A permanent magnet provided so as to be reciprocally movable in the axial direction in the bobbin.
It is a cylindrical member and is provided side by side in the axial direction, and includes a plurality of divided bobbins in which end portions in the axial direction are close to each other,
The groove is
The divided bobbin and the other divided bobbin are provided at close ends,
A vibration generator, wherein a lubricant is applied to at least a part of an inner wall of the bobbin. The groove is
The vibration generator according to claim 1, wherein the vibration generator is provided at a substantially center of the bobbin in a direction perpendicular to the axial direction.   3. The vibration generator according to claim 1, wherein an inner diameter of an end portion of the divided bobbin adjacent to the other divided bobbin is larger than an inner diameter of a portion excluding the end portion. .   The vibration generator according to any one of claims 1 to 3, wherein an end portion of the divided bobbin adjacent to the other divided bobbin has a tapered shape.   The vibration generator according to any one of claims 1 to 4, wherein an elastic body is provided between the divided bobbin and the other divided bobbin.   5. The vibration according to claim 1, further comprising a fitting portion that fits with the other divided bobbin at an end portion of the divided bobbin that is close to the other divided bobbin. Generator. A plurality of divided bobbins each having an outer diameter smaller than the inner diameter of the guide member and having a coil wound therein are arranged in the guide member, which is a cylindrical member, and the axial direction of the guide member A first insertion step of sequentially inserting in a direction in which the axial direction of the divided bobbins coincides;
A second insertion step of inserting a permanent magnet into the divided bobbin;
A molding step of contacting the plurality of divided bobbins inserted into the guide member by the first insertion step, and molding the bobbins in which the divided bobbins are arranged in the axial direction;
With
When the plurality of divided bobbins come into contact with each other in the forming step, the bobbins extend on the inner wall of the bobbin and in the direction intersecting the axial direction at the end where the divided bobbins and the other divided bobbins are close to each other. A method of manufacturing a vibration generator, wherein a groove is provided.

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