JP5742860B2 - Vibration generator - Google Patents

Description

  The present invention relates to a vibration generator that generates power by vibration.

  Conventionally, a vibration generator that converts kinetic energy caused by vibration into electric energy is known. In such a vibration generator, for example, an inductive current accompanying a change in magnetic flux is generated in the coil by vibrating a mover including a permanent magnet in the bobbin around which the coil is wound. This generated induced current can be supplied to an external load. For example, in the vibration power generator described in Patent Document 1, a coil wound around a bobbin is provided inside a coil spring. The support member fixed to the end of the coil spring vibrates due to the elastic force of the coil spring. The mover (weight and permanent magnet) fixed to the support member vibrates in the coil spring and reciprocates in the coil. As a result, an induced current is generated in the coil.

  In such a case, it is preferable to match (close) the natural frequency of the mover to the vibration frequency in the usage environment of the vibration generator. The reason is that when the vibration frequency and natural frequency in the use environment are the same or very close to each other, the mover vibrates efficiently in the use environment, and the power generation efficiency of the vibration generator is improved. The natural frequency of the mover may be called a resonance frequency or a natural vibration frequency. The natural frequency of the mover is specified based on the spring constant of the coil spring.

JP 2011-114884 A

  In the vibration generator described in Patent Document 1, in order to dispose the coil and the mover (weight and permanent magnet) in the coil spring, the inner diameter of the coil spring must be larger than the diameter of the coil and the permanent magnet. . Thus, when the shape of the coil spring is restricted, there is a problem that it is difficult to match the natural frequency to the vibration frequency.

  An object of the present invention is to provide a vibration generator that can easily match the natural frequency (resonance frequency) of a mover including a permanent magnet to the vibration frequency in a use environment.

The vibration generator according to the present invention is provided on at least one of a coil, a permanent magnet that is reciprocally movable in the coil in the axial direction, and both ends of the permanent magnet in the axial direction. A weight having a cross section cut in a direction perpendicular to the axial direction and having a diameter larger than the inner diameter of the coil, and a spring in which a strand is wound spirally and elastically deformed in the axial direction. A coil spring provided at a position that does not overlap the coil when projected onto a plane parallel to the axial direction, and an adjusting means for adjusting an elastic force by restricting the movement of the coil spring in the axial direction. The adjusting means includes a direction in which the distance in the axial direction from the end of the coil spring opposite to the end connected to the weight or the permanent magnet is a fixed position and intersects the axial direction. Moved to It is possible, when moving from the outside in a direction intersecting the axial direction on the inside, characterized in that entering the one of the plurality of gaps between the wires adjacent.

  According to the present invention, in the vibration power generator, when the coil and the coil spring are projected onto a plane parallel to the axial direction, the projected images do not overlap each other. For this reason, the shape of the coil spring is not limited by the shape of the coil. Therefore, the shape of the coil spring can be easily adjusted so that the natural frequency of the permanent magnet matches the vibration frequency in the usage environment of the vibration generator. For this reason, the power generation efficiency in the environment where the vibration power generator is used can be improved.

In the present invention, the weight may include a first weight provided at one end of the permanent magnet in the axial direction and a second weight provided at the other end . Also, the weight may be provided inside the coil spring. The inner diameter of the coil spring may be larger than the inner diameter of the coil. The weight may be provided so as to be relatively movable in a direction intersecting the axial direction with respect to the permanent magnet. The weight may include a plurality of detachable divided weights.

FIG. 3 is a diagram illustrating an internal structure of the vibration generator 1 (a state in which a plate member 16 is moved out of a tubular member 10). It is the figure which expanded the connection part of the fastening member 35 and the weight 50. FIG. FIG. 2 is a diagram showing an internal structure of the vibration generator 1 (a state in which a plate member 16 has moved into a cylindrical member 10). It is a figure which shows the internal structure of the vibration generator 1 in another embodiment. It is a figure which shows the internal structure of the vibration generator 1 in another embodiment.

  A vibration generator 1 according to an embodiment of the present invention will be described with reference to FIG. The upper and lower sides in FIG. 1 are referred to as the upper and lower sides of the vibration generator 1. The vibration generator 1 includes a housing 11. The shape of the housing 11 is a cylindrical shape. The axis of the housing 11 extends in the vertical direction. Hereinafter, the direction in which the axis of the housing 11 extends (that is, the vertical direction) is referred to as the axial direction. Both ends of the housing 11 in the axial direction are open. A wall member 12 is provided in the upper opening of the housing 11. The wall member 12 covers the opening at the upper end of the housing 11. A lid member 13 is provided in the lower opening of the housing 11. The lid member 13 covers the lower opening of the housing 11. The lid member 13 is detachable from the housing 11. As a material for the casing 11, the wall member 12, and the lid member 13, a nonmagnetic material such as a resin (polycarbonate resin or acrylic resin) can be used.

  The tubular member 10 is accommodated in the upper region of the space surrounded by the casing 11, the wall member 12, and the lid member 13. The cylindrical member 10 includes a cylindrical portion 101, two extending portions 102, and five extending portions 103. The shape of the cylindrical portion 101 is a cylindrical shape. The inner diameter of the cylindrical portion 101 is approximately 1/3 of the inner diameter of the housing 11. The axial direction of each of the cylindrical portion 101 and the housing 11 faces the same direction (vertical direction). The length of the cylindrical portion 101 in the axial direction is smaller than about ½ of the length of the casing 11 in the axial direction. The positions of the axial centers of the cylindrical portion 101 and the housing 11 are the same. Both ends of the cylindrical portion 101 in the axial direction are opened. The upper end of the cylindrical portion 101 is in contact with the wall member 12. The wall member 12 covers the opening at the upper end of the cylindrical portion 101.

  The two extending portions 102 and the five extending portions 103 are plate-like members extending from the outer peripheral wall of the cylindrical portion 101 in a direction orthogonal to the axial direction (hereinafter referred to as “orthogonal direction”). . The shape of each of the extending portions 102 and 103 when viewed from the axial direction is a circle having a hole at the center.

  Two extending portions 102 are provided at both ends of the cylindrical portion 101 in the axial direction. The diameter of the extended portion 102 is substantially the same as the inner diameter of the housing 11. The outer side (tip) of the extending portion 102 in the orthogonal direction is in contact with the inner wall of the housing 11. When the extending portion 102 contacts the inner wall of the housing 11, the position of the cylindrical member 10 with respect to the housing 11 is fixed. Five extending portions 103 are provided on the inner side of the extending portion 102 in the axial direction. The diameter of the extended portion 103 is slightly smaller than the diameter of the extended portion 102. The five extending portions 103 are arranged at equal intervals in the axial direction. The five extending portions 103 divide the outer peripheral wall of the cylindrical portion 101 into six equal parts in the axial direction.

  As a material of the cylindrical member 10, a nonmagnetic material such as a resin (acetal resin, liquid crystal polymer resin) can be used. The cylindrical member 10 functions as a bobbin around which a coil 20 described later is wound. In addition, the shape of the cylindrical member 10 can be changed. For example, the number of the extending portions 103 of the cylindrical member 10 is not limited to five, and may be 1 to 4, or 6 or more. The cylindrical member 10 may be configured not to include the extending portion 103.

  Each of the six coils 20 is wound around each of the portions of the outer peripheral wall of the cylindrical portion 101 divided into six equal parts by the five extending portions 103 along the outer peripheral wall. The extending direction of the electric wires constituting each coil 20 is orthogonal to the axial direction. The electric wires constituting each of the two adjacent coils 20 are wound in opposite directions. The inner diameter of the coil 20 matches the outer diameter of the cylindrical portion 101 of the cylindrical member 10. Hereinafter, the inner diameter of the coil 20 is referred to as “D1”.

  The coil 20 is not limited to the configuration wound around the cylindrical portion 101. For example, the coil 20 may be configured by only a spiral electric wire, and in this case, the cylindrical portion 101 may not be provided. The electric wires constituting each of the six coils 20 may be wound in the same direction. The number of the coils 20 is not limited to six, and may be 1 to 5, or 7 or more.

  The mover 30 is accommodated inside the cylindrical portion 101 of the cylindrical member 10. The mover 30 can reciprocate along the axial direction in the housing 11. The mover 30 includes six permanent magnets 34, a fastening member 35, and a weight 50.

  Each of the six permanent magnets 34 has the same shape and a cylindrical shape. The outer diameter of the permanent magnet 34 is slightly smaller than the inner diameter of the cylindrical portion 101. Hereinafter, the outer diameter of the permanent magnet 34 is referred to as “D2”. The axial directions of the six permanent magnets 34 face the same direction (vertical direction). The axial direction of each of the six permanent magnets 34 and the axial direction of the cylindrical portion 101 face the same direction (vertical direction). The six permanent magnets 34 are arranged in the axial direction. The lengths of the six permanent magnets in the axial direction are substantially the same as the lengths of the six coils 20 in the axial direction. The overall axial length of the six permanent magnets is substantially the same as the axial length of the tubular member 10. At least a part of the six permanent magnets 34 is disposed inside the cylindrical portion 101 of the cylindrical member 10. Each of the six permanent magnets 34 is provided with a through hole (not shown) extending in the axial direction at the axial center.

  Each of the six permanent magnets 34 is magnetized in the axial direction. In the portion where each of the six permanent magnets 34 is adjacent to the other permanent magnet 34, the same poles face each other. Thereby, the magnetic flux density around the six permanent magnets 34 is increased. A structure in which the same poles of the six permanent magnets 34 are opposed to each other is referred to as a “same pole facing structure”. The number of permanent magnets 34 is not limited to six and may be 1 to 5, or 7 or more.

  A bar-shaped fastening member 35 is inserted in the axial direction along the through holes of the six permanent magnets 34. The fastening member 35 includes projecting portions that project in the orthogonal direction at both ends in the axial direction. The protrusions sandwich the six permanent magnets 34 from both sides in the axial direction. The fastening member 35 prevents the permanent magnets 34 from being separated by a magnetic repulsive force acting between the six permanent magnets 34.

  A weight 50 is provided below the lower end of the fastening member 35. The weight 50 is provided so that the six permanent magnets 34 can easily reciprocate in the axial direction. The weight 50 includes a fixed weight 501 and three divided weights 503. The weight 50 is disposed below the cylindrical member 10.

  The fixed weight 501 is connected to the lower end of the fastening member 35. The shape of the fixed weight 501 is a substantially cylindrical shape. The diameter of the fixed weight 501 is larger than the inner diameter D1 of the coil 20 and smaller than the inner diameter of the housing 11. Hereinafter, the diameter of the fixed weight 501 is referred to as “D3”. The axial direction of the fixed weight 501 and the axial direction of each of the six permanent magnets 34 face the same direction (vertical direction). The length of the fixed weight 501 in the axial direction is approximately 1/5 of the length of the housing 11 in the axial direction. The fixed weight 501 includes a protruding portion 502 protruding in the orthogonal direction at the upper end.

  As shown in FIG. 2, the fixed weight 501 includes a connection hole 54 at the top. The connection hole 54 includes a first hole 541 extending downward from the upper surface of the fixed weight 501 and a second hole 542 provided at the lower end of the first hole 541. The shapes of the first hole 541 and the second hole 542 are cylindrical. The positions of the axes of the first hole 541 and the second hole 542 coincide. The inner diameter of the second hole 542 is larger than the inner diameter of the first hole 541. The fastening member 35 includes a protrusion 36 at the lower end. The protrusion 36 includes a first protrusion 361 extending downward from the lower end of the fastening member 35 and a second protrusion 362 provided at the lower end of the first protrusion 361. The shapes of the first protrusion 361 and the second protrusion 362 are cylindrical. The positions of the respective axes of the first protrusion 361 and the second protrusion 362 are the same. The diameter of the second protrusion 362 is larger than the diameter of the first protrusion 361.

  The first protrusion 361 passes through the first hole 541. The inner diameter of the first hole 541 is slightly larger than the diameter of the first protrusion 361. The second protrusion 362 is disposed in the second hole 542. The inner diameter of the second hole 542 is larger than the diameter of the second protrusion 362. Therefore, the six permanent magnets 34 and the fixed weight 501 fastened by the fastening member 35 are relatively movable in the orthogonal direction by the difference between the diameter of the first protrusion 361 and the inner diameter of the first hole 541. On the other hand, the length of the second hole 542 in the axial direction and the length of the second protrusion 362 in the axial direction are substantially the same. Accordingly, the positional relationship in the axial direction between the six permanent magnets 34 fastened by the fastening member 35 and the fixed weight 501 is fixed.

  In addition, the shape of the connection hole 54 and the protrusion part 36 can be made into another shape in which the six permanent magnets 34 and the fixed weight 501 are relatively movable in the orthogonal direction.

  As shown in FIG. 1, the three divided weights 503 are connected to the lower end of the fixed weight 501. Each of the three divided weights 503 has a substantially cylindrical shape. The diameter of each divided weight 503 is slightly smaller than the diameter D3 of the fixed weight 501. The axial direction of each divided weight 503 and the axial direction of the fixed weight 501 face the same direction (vertical direction). The length of each divided weight 503 in the axial direction is approximately ½ of the length of the fixed weight 501 in the axial direction. Each of the three divided weights 503 includes a screw at the upper end and a screw hole at the lower end. The fixed weight 501 has a screw hole at the lower end. The divided weight 503 is fixed to the fixed weight 501 by fitting the upper end screw into the lower end screw hole of the fixed weight 501. Thus, the divided weight 503 can be attached to and detached from the fixed weight 501. The divided weight 503 is fixed to the lower side of the other divided weight 503 by fitting the upper end screw into the screw hole at the lower end of the other divided weight 503. Accordingly, the divided weights 503 can be attached one by one in order under the fixed weight 501.

  As a material of the weight 50, brass, lead, stainless steel or the like can be used. The number of divided weights 503 is not limited to three, and may be 0 to 2 or 4 or more. The structure for fixing the divided weights 503 to the fixed weight 501 and the structure for fixing the divided weights 503 can be changed to those other than the screw and the screw hole. For example, the divided weight 503 may include a through hole extending in the axial direction through the axis. The divided weight 503 may be fixed to the fixed weight 501 by inserting a screw into the through hole of the divided weight 503 from below and fitting the screw into the screw hole of the fixed weight 501.

  A coil spring 40 is provided on the upper side of the lid member 13. The coil spring 40 includes an element wire that is an elongated metal wire wound spirally. The coil spring 40 is a compression spring that elastically deforms in the same direction as the axial direction. The lower end of the coil spring 40 is connected to the lid member 13. The length in the axial direction of the coil spring 40 that is not elastically deformed is approximately ½ of the length in the axial direction of the housing 11. The upper end of the coil spring 40 contacts the protruding portion 502 of the fixed weight 501 with the mover 30 moved downward, and the upper end of the coil spring 40 protrudes from the fixed weight 501 with the mover 30 moved upward. Separated from part 502. Regardless of the arrangement of the mover 30, at least a part of the weight 50 is arranged inside the coil spring 40, and at least a part of the six permanent magnets 34 is arranged inside the cylindrical part 101 of the cylindrical member 10. .

  The coil spring 40 is accommodated below the cylindrical member 10 in the space surrounded by the housing 11, the wall member 12, and the lid member 13. The coil spring 40 is disposed below the lower end of the coil 20 wound around the cylindrical portion 101 of the cylindrical member 10. When the coil 20 and the coil spring 40 are projected onto a virtual plane parallel to the axial direction, the projection image of the coil spring 40 and the projection image of the coil 20 do not overlap.

  The inner diameter of the coil spring 40 is slightly larger than the diameter D3 of the fixed weight 501. Hereinafter, the inner diameter of the coil spring 40 is referred to as “D4”. The inner diameter D1 of the coil 20, the diameter D2 of each of the six permanent magnets 34, the diameter D3 of the fixed weight 501 and the inner diameter D4 of the coil spring 40 satisfy the relationship D2 <D1 <D3 <D4. The diameter D3 of the fixed weight 501 is larger than the inner diameter of the cylindrical portion 101 of the cylindrical member 10. Accordingly, when the mover 30 moves upward in the housing 11 along the axial direction, the upper end of the fixed weight 501 comes into contact with the extended portion 102 at the lower end of the cylindrical member 10, and the fixed weight 501 is a cylindrical portion. 101 does not enter. Therefore, the movable element 30 has a state in which the upper end of the fixed weight 501 is in contact with the extended portion 102 at the lower end of the cylindrical member 10 and the protrusion 502 of the fixed weight 501 at the upper end of the coil spring 40 in the most compressed state. It is possible to reciprocate in the axial direction between the contacted state.

  The casing 11 includes a slit 17 in a portion separated from the lid member 13 by a length L1 in the axial direction. The slit 17 is an elongated slit extending in the orthogonal direction. A plate-like plate member 16 is provided in the vicinity of the slit 17 and outside the housing 11. The plate member 16 is movable in the orthogonal direction. As shown in FIG. 1, the plate member 16 moves away from the slit 17 in a state where the plate member 16 has moved to the outside in the orthogonal direction of the housing 11. On the other hand, as shown in FIG. 3, the plate member 16 enters the housing 11 from the slit 17 in a state where the plate member 16 has moved inward in the orthogonal direction. An end portion on the inner side in the orthogonal direction of the plate member 16 enters the inside from a portion of the element wire constituting the coil spring 40 that is disposed inside the slit 17. Specifically, it is as follows. The coil spring 40 forms a plurality of gaps between a plurality of portions extending in the orthogonal direction among the strands wound spirally in the axial direction. The plate member 16 enters a gap disposed inside the slit 17 among the plurality of gaps.

  When the plate member 16 enters any one of the plurality of gaps, the elastic force of the coil spring 40 changes. Specifically, it is as follows. In the state in which the plate member 16 has moved to the outside in the orthogonal direction (see FIG. 1), the coil spring 40 has the entire strand (length L1 + L2) in the axial direction acting as an effective winding. The coil spring 40 is elastically deformed uniformly over the entire region in the axial direction. On the other hand, in a state where the plate member 16 has moved inward in the orthogonal direction (see FIG. 3), the coil spring 40 is an element of a region of length L2 from the portion where the plate member 16 is inserted to the upper end of the coil spring 40. The wire acts as an effective winding. The coil spring 40 is elastically deformed only in the region corresponding to the length L2. Therefore, the elastic force is smaller when the plate member 16 is moved inward in the orthogonal direction than when the plate member 16 is moved outward in the orthogonal direction.

  In addition, the shape of the housing | casing 11, the cylindrical part 101 of the cylindrical member 10, the permanent magnet 34 of the needle | mover 30, and the weight 50 can be changed. For example, the casing 11, the cylindrical portion 101, the permanent magnet 34, and the weight 50 may have other elliptical cylindrical shapes such as an elliptical cylindrical shape and a square cylindrical shape. It is desirable that the permanent magnet 34 has the same cross-sectional shape as that in the cylindrical portion 101. The shape of the weight 50 preferably has the same cross-sectional shape as the housing 11. Even when the weight has a shape other than the cylindrical shape, the diameter of the cross section when the weight 50 is cut in the orthogonal direction is smaller than the inner diameter D4 of the coil spring 40 and larger than the inner diameter D1 of the coil 20.

  The diameter of the divided weight 503 may be larger than the diameter of the fixed weight 501. In this case, when the diameter of the divided weight 503 is “D5”, the inner diameter D1 of the coil 20, the diameter D2 of each of the six permanent magnets 34, the inner diameter D4 of the coil spring 40, and the diameter D5 of the divided weight 503 are: , D2 <D1 <D5 <D4 is satisfied. That is, the diameter D5 of the divided weight 503 is smaller than the inner diameter D4 of the coil spring 40 and larger than the inner diameter D1 of the coil 20.

  The material of the housing 11 is preferably a magnetic material such as iron or stainless steel in order to positively suppress the leakage magnetic field. There may be. In this case, metals such as copper, aluminum, and brass may be used.

  The shapes of the slit 17 and the plate member 16 can be changed. For example, a plurality of slits 17 may be provided in a portion of the housing 11 that is separated from the lid member 13 by the length L1 in the axial direction.

  The power generation operation of the vibration power generator 1 will be described with reference to FIG. The user generates vibration power in a vibrating body (for example, an automobile) that vibrates in the vertical direction with the axial direction of the housing 11 facing the vertical direction and the wall member 12 is disposed above the lid member 13. The machine 1 is fixed. The mover 30 moves downward by gravity. The upper end of the coil spring 40 contacts the protrusion 502 of the fixed weight 501, and the weight 50 is supported from below by the coil spring 40. As the vibrating body vibrates in the vertical direction, kinetic energy is transmitted to the mover 30. Further, kinetic energy is transmitted to the mover 30 by the elastic force of the coil spring 40.

  The mover 30 reciprocates up and down in the casing 11 along the axial direction. The weight 50 is in the axial direction between the state where the upper end of the fixed weight 501 is in contact with the extended portion 102 at the lower end of the cylindrical member 10 and the state where the protrusion 502 of the fixed weight 501 is in contact with the upper end of the coil spring 40. Move back and forth. At least some of the six permanent magnets 34 reciprocate in the axial direction inside the cylindrical portion 101 of the cylindrical member 10. Since the weight 50 is connected to the permanent magnet 34, the permanent magnet 34 reciprocates favorably in the axial direction even when the amount of vertical movement of the vibrating body is small.

  In the vibration power generator 1, the coil 20 and the coil spring 40 are in a positional relationship that does not overlap with their respective projected images when each is projected onto a virtual plane parallel to the axial direction. For this reason, the shape of the coil spring 40 is not limited to the shape of the coil 20. Therefore, the coil spring 40 is set so that the natural frequency of the mover 30 matches (very close to) the use environment of the vibration generator 1, specifically, the vibration frequency of the vibration body to which the vibration generator 1 is attached. The shape can be easily adjusted. When the vibration frequency of the vibrating body matches the natural frequency of the mover 30, the mover 30 vibrates efficiently due to the vibration of the vibrating body. For this reason, the power generation efficiency of the vibration power generator 1 is improved. In addition, the natural frequency in the needle | mover 30 may be called a resonance frequency or a natural vibration frequency.

  The vibration generator 1 can make the inner diameter of the coil spring 40 larger than the inner diameter of the coil 20. For this reason, since the elastic force of the coil spring 40 can be adjusted in a wide range, the natural frequency of the mover 30 can be adjusted in a wide range.

  Further, the vibration generator 1 can make the diameter D3 of the fixed weight 501 and the diameter D5 of the divided weight 502 larger than the inner diameter D1 of the coil 20. The larger the total weight of the mover 30, that is, the sum of the weights of the six permanent magnets 34 and the weight 50, the easier the mover 30 vibrates with a slight force. For this reason, the vibration power generator 1 can be adjusted to vibrate the mover 30 more easily by increasing the diameter D3 of the fixed weight 501 and the diameter D5 of the divided weight 502.

  The natural frequency of the mover 30 changes not only by the elastic force of the coil spring 40 but also by the total weight of the mover 30, that is, the weight obtained by adding the weights of the six permanent magnets 34 and the weight 50. Specifically, the natural frequency of the mover 30 can be reduced (lower) as the total weight of the weight 50 increases. Therefore, by adjusting the weight of the weight 50, it becomes easier to adjust the natural frequency of the mover 30 to match the vibration frequency even when the vibration frequency of the vibrating body to which the vibration generator 1 is attached is small. .

  The user of the vibration generator 1 can adjust the natural frequency of the mover 30 by switching the number of the divided weights 503 according to the vibration frequency of the vibration body to which the vibration generator 1 is attached. Thereby, the mover 30 can be more efficiently vibrated according to the vibration frequency of the vibrating body.

  Further, in the state where the plate member 16 has moved to the outside in the orthogonal direction (see FIG. 1) and the state in which the plate member 16 has moved to the inside in the orthogonal direction (see FIG. 3), Since the elastic force to be changed changes, the natural frequency of the mover 30 also changes. Specifically, for example, the natural frequency of the mover 30 in a state where the plate member 16 has moved outward in the orthogonal direction (see FIG. 1) is about 2.0 Hz, and the plate member 16 has moved inward in the orthogonal direction The position of the slit 17 in the axial direction is determined so that the natural frequency of the mover 30 in the state (see FIG. 3) is about 2.2 Hz. For this reason, the user of the vibration power generator 1 switches the position of the plate member 16 according to the vibration frequency of the vibration body to which the vibration power generator 1 is attached, thereby efficiently moving the mover 30 according to the vibration frequency of the vibration body. Can be vibrated.

  When the permanent magnet 34 passes through the inside of the coil 20, the magnetic flux generated by the permanent magnet 34 is orthogonal to the coil 20. As a result, an induced current is generated in the coil 20. As the permanent magnet 34 repeats reciprocating movement inside the coil 20, an alternating current is generated in the coil 20. The alternating current generated in the coil 20 is transmitted to a rectifier (not shown) via a wire connected to the coil 20. 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.

  The vibration generator 1 is in a state in which at least a part of the weight 50 is always disposed inside the coil spring 40. For this reason, the axial length of the vibration generator 1 can be shortened by the length in the axial direction of the portion of the weight 50 that has entered the inside of the coil spring 40. Therefore, the vibration generator 1 can be reduced in size.

  In the manufacturing process of the vibration power generator 1, there may be an error in the dimensions of the casing 11 and the cylindrical member 10. In this case, there is a possibility that the position of the axis of the housing 11 and the position of the axis of the cylindrical portion 101 are slightly shifted. However, in the vibration power generator 1, the permanent magnet 34 and the weight 50 can be moved relative to each other in the orthogonal direction, so that both move relative to each other in the orthogonal direction in accordance with the displacement of the axial center. Therefore, when the mover 30 is reciprocated, it is possible to prevent a portion of the mover 30 from repeatedly contacting the inner wall of the casing 11 and the cylindrical portion 101 and preventing the mover 30 from reciprocating.

  The present invention is not limited to the above embodiment, and various modifications can be made. Hereinafter, another embodiment will be described. For example, as shown in FIG. 4, the mover 30 of the vibration power generator 1 may include weights on both sides in the axial direction of the six permanent magnets 34. The vibration generator 1 of FIG. 4 differs from the vibration generator 1 of FIG. 1 in that a weight 60 is provided on the upper side in addition to the weight 50 on the lower side of the six permanent magnets 34. 4 differs from the vibration generator 1 of FIG. 1 in that spacers 38 and 39 are provided between the weights 50 and 60 and the six permanent magnets 34, respectively.

  The weight 60 includes a fixed weight 601. The shape of the fixed weight 601 is the same as that of the fixed weight 501 and includes a connection hole (first hole and second hole, see FIG. 2) and a screw hole. Like the fixed weight 501, a divided weight can be attached to the fixed weight 601. However, in the vibration power generator 1 of FIG. 4, no divided weight is attached to the fixed weight 601. The spacer 38 is provided between the fastening member 35 at the lower end and the fixed weight 501. The spacer 39 is provided between the fastening member 35 at the upper end and the fixed weight 601. Each of the spacers 38 and 39 has a cylindrical shape having a through hole in the axial center portion. Of the protrusions 36 (see FIG. 2) provided at the lower end of the fastening member 35, the first protrusion 361 (see FIG. 2) is longer in the axial direction than FIG. The first protrusion 361 is inserted into the through hole of the spacer 38. The permanent magnet 34 and the fixed weight 501 are separated by a length in the axial direction of the spacer 38. A second protrusion 362 (see FIG. 2) provided at the tip of the first protrusion 361 is disposed in the second hole 542 (see FIG. 2) of the fixed weight 501.

  Unlike the vibration power generator 1 of FIG. 1, projecting portions (first projecting portion and second projecting portion) having the same shape as the projecting portion 36 extend upward from the upper end of the fastening member 35. The first protrusion is inserted into the through hole of the spacer 39. The permanent magnet 34 and the fixed weight 601 are separated by a length in the axial direction of the spacer 39. The second protrusion provided at the tip of the first protrusion is disposed in the second hole of the fixed weight 601. Thereby, the weight 60 is connected to the fastening member 35. The six permanent magnets 34 and the fixed weight 601 are relatively movable in the orthogonal direction.

  When the weight 50 is provided at one end of the six permanent magnets 34 by providing the weights 50 and 60 respectively at both ends of the six permanent magnets 34 as in the vibration generator 1 of FIG. 4 (FIG. 1). Compared to the reference), the total weight of the movable element 30 can be increased. As described above, in the vibration power generator 1 shown in FIG. 4, the adjustment of the total weight of the mover 30 to obtain the target natural frequency is further facilitated.

  For example, as shown in FIG. 5, the permanent magnet 71 may be attached to the lower end of the mover 30 of the vibration generator 1, that is, the lower end of the weight 50, and the permanent magnet 72 may be attached to the upper side of the lid member 13. Note that the directions of the permanent magnets 71 and 72 are adjusted so that the same poles face each other. In the case of FIG. 5, the permanent magnet 71 provided at the lower end of the weight 50 is magnetized to the N pole on the upper side and magnetized to the S pole on the lower side. The permanent magnet 72 provided on the upper surface of the lid member 13 is magnetized to the S pole on the upper side and magnetized to the N pole on the lower side. For this reason, a repulsive force acts between the permanent magnets 71 and 72. The lid member 13 can change the position in the axial direction with respect to the housing 11.

  When the vibration power generator 1 of FIG. 5 vibrates, an upward force acts on the mover 30 by the repulsive force between the permanent magnets 71 and 72. As a result, the natural frequency of the mover 30 changes. As described above, the vibration generator 1 of FIG. 5 has the permanent magnets 71 and 72 in addition to the total weight of the weight 50, the elastic force of the coil spring 40, and whether or not the plate member 16 is used. It becomes possible to change the frequency. For example, the user can finely adjust the magnitude of the force acting on the mover 30 by the permanent magnets 71 and 72 by changing the position of the lid member 13 in the axial direction relative to the housing 11. Therefore, the vibration generator 1 can easily finely adjust the natural frequency of the mover 30 without changing the total weight of the weight 50 and the elastic force of the coil spring 40.

  In the above-described embodiment, when the mover 30 moves downward, the coil spring 40 contacts the protrusion 502 of the fixed weight 501. On the other hand, when the mover 30 moves downward, the coil spring 40 may be in contact with any part of the mover 30. For example, the coil spring 40 may contact the permanent magnet 34 or may contact the fastening member 35. Even in these cases, since the elastic force of the coil spring 40 is transmitted to the mover 30, the coil spring 40 can vibrate the mover 30 satisfactorily.

  The coil spring 40 may be provided below the weight 50. The upper end of the coil spring 40 may transmit elastic force to the mover 30 by contacting the lower end of the weight 50 (that is, the lower end of the divided weight 503). In this case, the inner diameter D4 of the coil spring 40 may be smaller than any one of the diameter D3 of the fixed weight 501, the diameter D5 of the divided weight 503, and the inner diameter D1 of the coil 20. The vibration generator 1 may be configured not to include the slit 17 and the plate member 16. The fastening member 35 and the weight 50 may be fixed with a screw, an adhesive, or the like. The relative position in the orthogonal direction between the fastening member 35 and the weight 50 may be fixed.

  One of the weights 50 and 60 corresponds to the “first weight” of the present invention, and the other corresponds to the “second weight” of the present invention. The plate member 16 corresponds to the “adjusting means” of the present invention.

DESCRIPTION OF SYMBOLS 1 Vibration generator 10 Cylindrical member 16 Plate member 17 Slit 20 Coil 30 Mover 34 Permanent magnet 50, 60 Weight

Claims (6)

Coils,
A permanent magnet provided in the coil so as to be capable of reciprocating in the axial direction of the coil;
A weight provided at at least one of both ends of the permanent magnet in the axial direction, wherein a weight of a cross section cut in a direction perpendicular to the axial direction is larger than the inner diameter of the coil,
A coil spring that is wound spirally and elastically deforms in the axial direction, and is provided at a position that does not overlap the coil when projected onto a plane parallel to the axial direction ;
Adjusting means for adjusting elastic force by restricting movement of the coil spring in the axial direction ;
The adjusting means includes
Of the coil spring, the distance in the axial direction from the end opposite to the side connected to the weight or the permanent magnet is fixed, and is movable in a direction intersecting the axial direction. A vibration power generator that enters any one of a plurality of gaps between adjacent strands when moving from the outside to the inside in a direction that intersects the direction . The weight is
The vibration generator according to claim 1, further comprising a first weight provided at one end portion of the permanent magnet in the axial direction and a second weight provided at the other end portion. .
At least a portion of the weight is, the vibration generator according to claim 1 or 2, characterized in that provided inside the coil spring. The vibration generator according to any one of claims 1 to 3 , wherein an inner diameter of the coil spring is larger than an inner diameter of the coil. The weight is vibration generator according to any of claims 1 4, characterized in that provided relatively movable in a direction crossing the axial direction with respect to the permanent magnet. The weight is
Vibration generator according to any of claims 1 5, characterized in that it comprises a removable plurality of divided weights.

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