JP2013039021A - Power generation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power generation apparatus which is suitable for the thickness reduction.SOLUTION: A power generation apparatus 50 includes: magnets 33A, 33B; a lower yoke 31 and an upper yoke 32 which are connected with the magnets 33A, 33B; and a coil 41 around which a coil wire disposed so as to face the magnets 33A, 33B or at least parts of the lower yoke 31 and the upper yoke 32 in the vertical direction is wound. The magnets 33A, 33B, the lower yoke 31, and the upper yoke 32 are integrated to form a movable unit 23 and the movable unit 23 vibrates against the coil 41. Thus, the thicknesses of the magnets 33A, 33B and the coil 41 are reduced and the power generation apparatus 50 which is suitable for the thickness reduction is provided.

Description

  TECHNICAL FIELD The present invention relates to a power generator used mainly for industrial electronic devices such as watches, hearing aids, mobile phones and personal computers, manufacturing machines, household electronic devices such as refrigerators and washing machines, and electronic devices such as various sensors. Is.

  In recent years, as electronic devices such as watches, hearing aids, mobile phones and personal computers, industrial and household electronic devices, and various sensors have become more diverse and sophisticated, the processing load on control means such as CPUs has increased and has been used. Since the power to be used is increasing and the number of times of charging and the frequency of battery replacement are also increasing, there is a demand for a power generator built in an electronic device.

  Such a conventional power generator will be described with reference to a cross-sectional view of the conventional power generator shown in FIG. In FIG. 1, a power generation device 10 includes a spring 2 and a magnet 3 disposed in a cylindrical housing 1, and a coil 4 wound around the outer periphery of the housing 1. Here, the right end of the spring 2 is fixed to the magnet 3, and the left end is fixed to the side wall of the housing 1, so that the magnet 3 can vibrate left and right in the housing 1.

  The power generation apparatus 10 configured as described above is built in a predetermined position such as the back surface of the liquid crystal display in an electronic device (not shown) such as a mobile phone, and when the mobile phone is vibrated left and right, the magnet 3 vibrates left and right. However, the electronic device is charged by the electromotive force generated in the coil 4 by electromagnetic induction.

  As prior art document information related to the invention of this application, for example, Patent Document 1 is known.

JP 2009-112069 A

  However, the conventional power generator has a simple structure. However, in order to be built in an electronic apparatus that is becoming thinner in recent years, the coil 4 that is cylindrical and requires a relatively large thickness and that is exposed to the outside of the housing 1 is used. There is a problem that it is not suitable for thinning, for example, it is necessary to increase the number of turns of the coil wire to some extent in order to obtain a sufficient power generation amount.

  The present invention solves such a conventional problem, and an object of the present invention is to provide a power generator suitable for thinning.

  In order to achieve the above object, the present invention particularly provides a magnet formed with a longer width in the front-rear and left-right directions than the thickness in the vertical direction, a yoke member connected to the magnet, and at least a magnet or a yoke member. A coil around which a coil wire arranged to face a part in the vertical direction is wound is provided. Here, the coil is formed such that the width in the front-rear and left-right directions is longer than the thickness in the up-down direction with the up-down direction as the central axis of winding. Further, the magnet and the yoke member integrally form a movable unit, and the movable unit is configured to vibrate left and right with respect to the coil.

  According to the present invention, the magnet formed with a longer width in the front-rear and left-right directions than the thickness in the up-down direction, the yoke member connected to the magnet, and the magnet or the yoke member in the up-down direction A coil around which coil wires arranged opposite to each other are wound is provided. Here, the coil is formed such that the width in the front-rear and left-right directions is longer than the thickness in the up-down direction with the up-down direction as the central axis of winding. Further, the magnet and the yoke member integrally form a movable unit, and the movable unit is configured to vibrate left and right with respect to the coil. By being configured in this manner, the magnet and the coil can be made thin, so that it is possible to realize a power generator that can be made thin.

Sectional drawing of the electric power generating apparatus by Embodiment 1 of this invention Exploded perspective view of the power generator A perspective view excluding some of the components of the power generator Sectional drawing which shows the operating state of the power generator The perspective view except a part of component which shows the operation state of the power generator Sectional drawing of the other electric power generating apparatus concerning Embodiment 1 Top view of another power generator according to the first embodiment Sectional drawing of the electric power generating apparatus by Embodiment 2 of this invention Top view of the power generator Exploded perspective view of another power generator according to the second embodiment Sectional drawing of the other electric power generating apparatus concerning Embodiment 2 Top view showing the operation of another power generator according to the second embodiment. Sectional view of a conventional power generator

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  These drawings are partially enlarged in size for easy understanding of the configuration.

(Embodiment 1)
FIG. 1 is a cross-sectional view of a power generation device according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a perspective view of the same component part. 1 is a sectional view when the movable unit 23 is in a neutral position, FIG. 3A is a perspective view in a state where the upper case 25 is removed in a neutral position, and FIG. Furthermore, it is a perspective view of the state where the upper yoke 32 is removed.

  Here, the power generation device 50 includes a lower case 21, a plurality of springs 22, a movable unit 23, a fixed unit 24, and an upper case 25.

  Further, the lower case 21 is a rectangular box shape having an upper surface opening, and is made of a nonmagnetic material such as resin or nonmagnetic stainless steel, and columnar protrusions 21B protrude from the four corners of the inner bottom surface 21A. Further, conductive metal connection terminals 26A and 26B are provided in the center of the front and rear sides of the inner bottom surface 21A, and external electrodes 27A and 27B are provided on the lower surface of the inner bottom surface 21A. The connection terminals 26A and 26B are electrically connected to the conductive metal external electrodes 27A and 27B disposed on the lower surface of the lower case 21, respectively.

  The spring 22 is a torsion spring that expands and contracts in the left-right direction. The coil portion 22A is a circular metal wire, the arm portion 22B extends outward from the coil portion 22A, and the arm portion 22C extends inward. It has. The tip of the arm portion 22C is bent upward to form an end portion 22D.

  Furthermore, the movable unit 23 includes a lower yoke 31, an upper yoke 32, magnets 33A and 33B, and a connection plate 34, which will be described.

  Here, the lower yoke 31 is a metal plate serving as a yoke member, and is made of a magnetic material. The side surface is folded upward to form the side wall 31A, and the bottom surface 31 includes notches 31B on four sides of the bottom surface.

  The upper yoke 32 is a substantially H-shaped metal plate as a yoke member, and is made of a magnetic material. The upper yoke 32 is provided with a guide portion 32B cut out in a square shape at the center of the front end portion and the rear end portion, while the side surface is folded downward to form a side wall 32A. In addition, two slits 32C are provided on the left and right at the position where the side wall 32A is bent.

  Suitable materials for the lower yoke 31 and the upper yoke 32 include magnetically conductive stainless steel, electromagnetic steel plates such as silicon steel plates, iron such as pure iron and cast iron, permalloy and ferrite.

  Further, the magnets 33A and 33B are rectangular plates, for example, the magnet 33A is magnetized so that the upper surface is an S pole and the lower surface is an N pole, and the magnet 33B is an N pole on the upper surface and the lower surface is an S pole. The magnets 33A and 33B preferably have a strong magnetic force, and neodymium magnets containing neodymium, iron, and boron are suitable. Note that it is desirable to perform rust-preventing metal plating on the surfaces of the magnets 33A and 33B. Further, the magnet 33A may be magnetized so that the upper surface is an N pole and the lower surface is an S pole, and the magnet 33B is magnetized so that the upper surface is an S pole and the lower surface is an N pole.

  The connection plate 34 is a rectangular metal plate made of a nonmagnetic material such as brass. Here, the connection plate 34 is connected to the magnets 33A and 33B, and the magnets 33A and 33B and the connection plate 34 are arranged in an H shape as viewed from above. The connection of the connection plate 34 to the magnets 33A and 33B may be fixed using an adhesive (not shown) or the like, or the magnets 33A and 33B may simply be in contact with the connection plate 34. Further, when the movable unit 23 vibrates left and right, the connection plate 34 functions as a weight, and the resonance frequency of vibration can be adjusted by changing the weight of the connection plate 34.

  The fixed unit 24 includes a coil 41 and a yoke guide 42.

  Here, the coil 41 is provided with a hole 41A penetrating vertically in the center, and a coil wire is wound around the vertical direction as an axis. Examples of coil wires include polyurethane copper wires, polyester copper wires, polyamide copper wires, and the like. For example, the coil 41 may be formed of a resin component and a bobbin may be formed, and one coil wire may be directly wound around the bobbin, or an air-core coil may be formed by winding a self-bonding coil wire. .

  The yoke guide 42 includes a locking portion 42A protruding downward at the center of the lower surface, and a recess 42B provided with a predetermined width on the upper surface side of the locking portion 42A. Further, a step portion 42E is provided near the upper surface of the front end portion 42C and the rear end portion 42D of the yoke guide 42.

  The engaging portion 42A of the yoke guide 42 is inserted into the hole 41A, and the coil 41 is fixed to the yoke guide 42.

  The upper case 25 has a rectangular box shape with an opening on the lower surface, and is made of a nonmagnetic material such as resin or nonmagnetic stainless steel. A protrusion 25B is provided at the lower end of the left and right side walls 25A.

  Each component of this electric power generation apparatus 50 is arrange | positioned as follows.

  Here, the lower yoke 31 is disposed on the upper surface of the inner bottom surface 21 </ b> A of the lower case 21.

  A fixing unit 24 in which the engaging portion 42 </ b> A of the yoke guide 42 is inserted into the hole 41 </ b> A of the coil 41 is disposed above the lower yoke 31. The front end portion 42C and the rear end portion 42D of the yoke guide 42 are fixed to the front and rear side walls 21C of the lower case 21. The ends of the coil wires forming the coil 41 are electrically connected to the connection terminals 26A and 26B by soldering or the like, and the coil 41 and the external electrodes 27A and 27B are electrically connected.

  Further, the magnets 33 </ b> A and 33 </ b> B and the connection plate 34 combined in an H shape in a top view are arranged on the yoke guide 42. Here, the connection plate 34 is disposed in the recess 42B, and the connection plate 34 is configured to be slidable left and right along the recess 42B.

  Further, the coil portion 22 </ b> A of the spring 22 is inserted into the protrusion 21 </ b> B of the lower case 21. Here, the arm portion 22 </ b> B extending to the outside of the coil portion 22 </ b> A is pressed against the inner surface of the lower case 21.

  The upper yoke 32 is disposed so as to cover the magnets 33A and 33B and the connection plate 34 from above. Here, the end portion 22D of the arm portion 22C is exposed from the slit 32C, and the guide portion 32B is aligned with the stepped portion 42E. Here, the side wall 31A of the lower yoke 31 is overlapped with the side wall 32A of the upper yoke 32, and the lower yoke 31 and the upper yoke 32 are integrated with the magnets 33A and 33B and the connecting plate 34, which are combined in an H shape. Is formed. At this time, since the end portion 22D of the arm portion 22C is exposed from the slit 32C, the movable unit 23 is urged from the left and right and is positioned at the approximate center of the lower case 21.

  Further, the lower yoke 31 and the upper yoke 32 are arranged in connection with the magnets 33A and 33B. The connection of the lower yoke 31 and the upper yoke 32 to the magnets 33A and 33B may be fixed using an adhesive (not shown) or the like, or may be welded. Alternatively, the magnets 33A and 33B, the lower yoke 31, and the upper yoke 32 may be simply in contact with each other.

  Here, since the lower yoke 31 and the upper yoke 32 are connected so that the magnetization of the magnet 33B is reversed on the upper and lower surfaces with respect to the magnet 33A, the direction of the magnetic field generated by the magnet 33A and the magnet 33B is obstructed. In addition, the presence of the lower yoke 31 and the upper yoke 32 prevents leakage of the magnetic field. Thereby, when the power generation device 50 is used, even if an electronic circuit or the like is disposed outside, the structure is difficult to be affected by noise or the like due to a magnetic field.

  The protrusion 25B of the upper case 25 is inserted inside the side wall 21C of the lower case 21, and the upper case 25 is covered from above the movable unit 23 so that the side wall 25A and the side wall 21C are in contact with each other.

  Here, the movable unit 23 is configured to move to the left and right with respect to the coil 41 in the combined lower case 21 and upper case 25. When the movable unit 23 moves left and right, the magnets 33A and 33B of the movable unit 23 move left and right with respect to the coil 41 of the fixed unit 24, and a current flows through the coil 41 by electromagnetic induction. This current can be derived through the external electrodes 27A and 27B.

  The power generation device 50 configured as described above includes a watch, a hearing aid, a mobile phone and a personal computer, industrial electronic devices such as manufacturing machines, household electronic devices such as refrigerators and washing machines, automobile-related electronic devices, and various sensors. It is built in a predetermined electronic device. Here, the power generation device 50 is mounted on a circuit board or the like in the electronic device. Since the power generation device 50 is configured in the upper case 25 and the lower case 21 and can be mounted on a circuit board or the like using the external electrodes 27A and 27B, it is easy to handle.

  The power generation device 50 is connected to a rectifier circuit (not shown) that rectifies the current in a fixed direction regardless of which direction the current flows through the external electrodes 27A and 27B. A storage circuit (not shown) such as is connected. As a rectifier circuit, a bridge-type full-wave rectifier circuit configured by connecting four diodes in a predetermined direction is suitable.

  When the user holding the electronic device walks or the like, an external force is applied to the power generation device 50 according to the movement of the user, and the movable unit 23 vibrates with respect to the fixed unit 24. The operation of the movable unit 23 relative to the fixed unit 24 at this time will be described with reference to the cross-sectional view of FIG. 4 and the perspective view of FIG.

  Here, FIG. 4 is a cross-sectional view when the movable unit 23 is displaced to the rightmost side, FIG. 5A is a perspective view with the upper case 25 removed in that state, and FIG. It is the perspective view which removed.

  Here, when the movable unit 23 is displaced to the right with respect to the fixed unit 24, the magnets 33A and 33B of the movable unit 23 are displaced to the right with respect to the coil 41 of the fixed unit 24.

  Then, the arm portion 22C of the left spring 22 extends, the right spring 22 contracts, and a force for returning to the left side is applied to the movable unit 23. Here, the protrusion 21B that holds the coil portion 22A of the right spring 22 enters the inside of the notch 31B of the lower yoke 31, thereby increasing the width of displacement of the movable unit 23. Suitable for miniaturization of the device 50.

  Here, since a force for returning to the left side is applied to the movable unit 23, the movable unit 23 is then displaced to the left side with respect to the fixed unit 24. At this time, it is displaced to the left beyond the neutral position shown in FIGS. At this time, a force returning to the right side is applied to the movable unit 23 by the spring 22, and then the movable unit 23 is displaced to the right side. That is, the movable unit 23 vibrates with respect to the fixed unit 24.

  Then, when the movable unit 23 vibrates with respect to the fixed unit 24, an alternating current flows through the external electrodes 27A and 27B, and the power storage circuit is charged through the rectifier circuit.

  Then, when the electronic device is used, electricity stored in the storage circuit is used as operating power.

  In order to continuously generate the vibration of the movable unit 23, it is preferable to match the resonance frequency of the vibration of the movable unit 23 with the frequency of vibration received by the electronic device. The resonance frequency of the movable unit 23 is generally determined from the spring constant of the spring 22 and the mass of the movable unit 23. For example, when the power generation device 50 is built in a portable electronic device, it is desirable to adjust the spring constant of the spring 22 so that the resonance frequency of the vibration of the movable unit 23 is 1 Hz to 10 Hz in accordance with the walking frequency. . This is because by adjusting the resonance frequency of the vibration of the movable unit 23 by selecting the spring 22, it is possible to realize the power generation device 50 in which the resonance frequency is changed without changing the movable unit 23.

  In the above description, the magnets 33A and 33B and the connection plate 34 are disposed above the coil 41. However, as shown in the sectional view of FIG. An arrangement may be adopted. Here, the upper yoke 53A and the lower yoke 53B are connected to the upper and lower surfaces of the magnet 52A, and the yoke members of the upper yoke 53C and the lower yoke 53D are connected to the upper and lower surfaces of the magnet 52B. The upper yokes 53A and 53C and the lower yokes 53B and 53D are made of a magnetic material, and are configured to generate a vertical magnetic field between the upper yokes 53A and 53C and the lower yokes 53B and 53D.

  The magnets 52A and 52B are magnetized, for example, such that the magnet 52A has an S pole on the upper surface, the N pole on the lower surface, and the magnet 52B has an N pole on the upper surface and an S pole on the lower surface.

  4A shows a neutral position, and FIG. 4B shows a state where the magnets 52A and 52B, the upper yokes 53A and 53C, and the lower yokes 53B and 53D are integrally displaced to the left. The fixed unit 61 includes a coil 51 and a yoke guide 54, and the movable unit 62 includes magnets 52A and 52B, upper yokes 53A and 53C, and lower yokes 53B and 53D. And with respect to the fixed unit 61, the movable unit 62 vibrates left and right to generate power.

  Although the spring 22 is shown as a torsion spring, the present invention can be implemented even with other types of springs such as a leaf spring, a compression coil spring, and a tension coil spring. For example, as shown in the top view of FIG. 7, the tension coil spring 72 can be used for left and right vibration of the movable unit 23. Here, the lower case 71 is provided with two protrusions 71A on the left and right sides from the inner bottom surface. Buffer members 73 such as rubber and sponge are disposed at two locations inside the protrusion 71A. The tension coil spring 72 is held at a substantially central position between the protrusion 71 </ b> A and the inner wall of the lower case 71.

  Here, the movable unit 23 vibrates left and right by the tension coil spring 72. Further, the impact on the movable unit 23 is reduced by the buffer member 73 by causing the side surface of the movable unit 23 to collide with the buffer member 73 at the left and right ends of the vibration of the movable unit 23.

  For example, when a tension coil spring such as the tension coil spring 72 is used, it is possible to float the movable unit 23 in a hollow state, and in that case, the friction generated by sliding between the upper case 25 and the lower case 21 is reduced. Thus, the movable unit 23 can be vibrated.

  Although the spring 22 has been described as an example of the elastic body, an elastic material such as rubber may be used.

  The magnets 33A, 33B or the magnets 52A, 52B have been described as connecting both the upper and lower yoke members. However, if the magnets 33A, 33B are connected to either the upper yoke or the lower yoke, Implementation of the present invention is possible. Note that the configuration in which both the upper and lower yoke members are connected has the advantage of increasing the amount of power generation and suppressing the magnetic field leaking outside the yoke member.

  Further, although the power generation device 50 has been described as including the connection plate 34, the present invention can be implemented without the connection plate 34.

  Further, among the yoke members, the upper yoke 32 has been described as having an H shape when viewed from above, but may have a shape without the guide portion 32B. Further, it is desirable that the portion notched by the guide portion 32B is within 20% when the upper yoke 32 is viewed from above. Similarly, the portion to be cut out as the cutout portion 31 </ b> B is preferably within 20% in the top view of the lower yoke 31. This is because the magnetic field leaking to the outside of the yoke member can be further suppressed.

  As described above, according to the first embodiment, the magnets 33A and 33B formed with the longitudinal and lateral widths made longer than the vertical thickness, the yoke member connected to the magnets 33A and 33B, and the magnet 33A. , 33B or at least a part of the yoke member is provided with a coil 41 wound with a coil wire disposed so as to be opposed in the vertical direction. Here, the coil 41 is formed such that the vertical direction is the central axis of winding and the width in the front-rear and left-right directions is longer than the thickness in the vertical direction. Further, the magnets 33 </ b> A and 33 </ b> B and the yoke member integrally form the movable unit 23, and the movable unit 23 vibrates with respect to the coil 41. As described above, the magnets 33A and 33B formed with a longer width in the front-rear and left-right directions than the thickness in the vertical direction and the vertical direction as the central axis of the winding, the width in the front-rear and left-right directions compared to the thickness in the vertical direction. With the coil 41 formed long, the thickness can be reduced, and the power generation device 50 suitable for thickness reduction can be provided.

  Further, an upper yoke 32 and a lower yoke 31 are provided as yoke members, an elastic body is provided on the side of the movable unit 23, and the coil 41 is disposed between the upper yoke 32 and the lower yoke 31. As a result, the coil 41 can be inserted into the movable unit 23, and the upper yoke 32 and the lower yoke 31 can suppress the leakage of the magnetic field generated by the magnets 33A and 33B.

  Moreover, since it comprises the magnets 33A and 33B and the connection plate 34 is disposed between the magnets 33A and 33B, the resonance frequency of the movable unit 23 can be adjusted by the weight of the connection plate 34. is there.

  Further, a lower case 21 having a protrusion 21B for holding an elastic body is provided, and a notch 31B is provided in the lower yoke 31. When the movable unit 23 moves most from the neutral position, the protrusion 21B is inward of the notch 31B. I try to enter. For this reason, since the movable unit 23 can be moved without being regulated by the position of the protrusion 21B, it is suitable for downsizing.

  Further, the magnets 52A and 52B are arranged in the left and right direction of the coil 51, and the upper yokes 53A and 53C and the lower yokes 53B and 53D connected to the magnets 52A and 52B are arranged to face the coil 51 in the vertical direction. Thus, the magnets 52A and 52B can be disposed on the side of the coil 51, which is suitable for thinning.

  Further, the movable unit 23, the coil 41, and the elastic body are accommodated between the upper case 25 and the lower case 21, and external electrodes 27A and 27B electrically connected to the coil 41 are provided on the lower surface of the lower case 21. Yes. For this reason, it is possible to handle the power generation device 50 as a whole, and convenience in handling such as mounting on a circuit board in an electronic device is improved.

(Embodiment 2)
Hereinafter, power generation device 150 according to Embodiment 2 of the present invention will be described with reference to the drawings.

  FIG. 8 is a cross-sectional view of the power generation device 150 according to Embodiment 2 of the present invention, and FIG. 9 is a top view with the upper case 125 and the upper yoke 132 removed. 8 corresponds to the AA cross section of FIG.

  The difference between the second embodiment and the first embodiment is that the elastic bodies 122A to 122D are connected to the left and right sides and the front and rear sides of the movable unit 123, and the movable unit 123 is moved to the front and rear and right and left by expansion and contraction of the elastic bodies 122A to 122D. Is configured to vibrate.

  The power generation apparatus 150 includes a lower case 121, elastic bodies 122A to 122D, a movable unit 123, a fixed unit 124, and an upper case 125.

  Here, the lower case 121 has a rectangular box shape with an upper surface opening. The elastic bodies 122 </ b> A to 122 </ b> D are, for example, springs, and connect the front and rear and left and right inner surfaces of the lower case 121 and the side surfaces of the movable unit 123. The movable unit 123 can vibrate forward, backward, left and right with respect to the fixed unit 124 by the expansion and contraction of the elastic bodies 122A to 122D.

  Further, the upper case 125 is disposed so as to cover the lower case 121, whereby the elastic bodies 122 </ b> A to 122 </ b> D, the movable unit 123, and the fixed unit 124 are accommodated in the lower case 121.

  Next, the configuration of the movable unit 123 and the fixed unit 124 will be described.

  The movable unit 123 includes a lower yoke 131, an upper yoke 132, and magnets 133A to 133D.

  Here, the lower yoke 131 is a metal plate serving as a yoke member, and is made of a magnetic material. The side surface is folded upward to form a side wall 131A, and the side wall 131A is provided with a square hole 131B. One end of each of the elastic bodies 122A to 122D is connected to the side wall 131A.

  The magnets 133A to 133D are plate-like, and adjacent magnets are magnetized with magnetic poles having different top surfaces. For example, the upper surfaces of the magnets 133A, 133B, 133C, and 133D are magnetized to the N pole, the S pole, the N pole, and the S pole, respectively. Here, the lower surfaces of the magnets 133 </ b> A to 133 </ b> D are magnetized with magnetic poles different from the upper surface, and are fixed to the lower yoke 131. The magnets 133A to 133D are arranged at a predetermined interval, and a guide path 134 is formed between the adjacent magnets 133A to 133D.

  The upper yoke 132 is a metal plate serving as a yoke member and is disposed so as to cover the lower yoke 131, and the magnets 133 </ b> A to 133 </ b> D are accommodated between the upper yoke 132 and the lower yoke 131.

  The fixed unit 124 includes coils 141 </ b> A to 141 </ b> D and a yoke guide 142.

  Here, the yoke guide 142 includes arms 142 </ b> A to 142 </ b> D extending in the front, rear, left, and right directions, and the arms 142 </ b> A to 142 </ b> D intersect at right angles at the center of the yoke guide 142.

  Further, the ends of the arms 142 </ b> A to 142 </ b> D are bent downward on the outside of the square hole 131 </ b> B, and the ends are fixed to the inner bottom surface of the lower case 121. Furthermore, the protrusion 142E is provided in the upper part of arms 142A-142D.

  The coils 141A to 141D are configured by winding coil wires around the vertical direction. The protrusion 142E penetrates the coils 141A to 141D, and fixes the coils 141A to 141D to the yoke guide 142.

  In order to make the movable unit 123 movable with respect to the fixed unit 124, the arms 142A to 142D are arranged along the guide path 134, and a space is provided between the yoke guide 142 and the magnets 133A to 133D. Yes. Each arm 142A to 142D passes through the square hole 131B.

  Thereby, magnets 133A-133D can vibrate with respect to yoke guide 142 using the space between yoke guide 142 and magnets 133A-133D.

  Note that the ends of the coil wires forming the coils 141A to 141D are electrically connected to an external electrode (not shown).

  In the power generation device 150 configured as described above, for example, when a user holding an electronic device walks, an external force is applied to the power generation device 150 according to the movement of the user, and the movable unit 123 becomes a fixed unit 124. It vibrates and generates electricity. Then, electric power for operating the electronic device is supplied via a rectifier circuit, a power storage circuit, and the like inside the external electrode and the electronic device (not shown).

  Next, what is described with reference to FIGS. 10 to 12 is another power generation apparatus 250 according to the second embodiment.

  10 is an exploded perspective view of the power generation device 250, and FIG. 11 is a cross-sectional view.

  Similarly to the power generation apparatus 150, the power generation apparatus 250 is configured such that the movable unit 223 vibrates in the front / rear and left / right directions with respect to the fixed unit 224. However, as compared with the power generation device 150, the power generation device 250 includes a coil 241A on the upper side of the magnets 233A and 233B arranged at the same height on the horizontal plane, a coil 241B on the lower side, and the magnets 233A and 233B in the coil 241A. And the point of being sandwiched between the coils 241B is different.

  The power generation device 250 includes a lower case 221, elastic bodies 222 </ b> A to 222 </ b> D, a movable unit 223, a fixed unit 224, and an upper case 225.

  The lower case 221 has a cylindrical box shape with an upper opening. Here, a bearing 221A is provided as a circular hole at a substantially central position on the inner bottom surface of the lower case 221, and a coil receiver 221B is provided around the bearing 221A so as to be recessed.

  The elastic bodies 222 </ b> A to 222 </ b> D connect, for example, springs, the front and rear inner surfaces of the lower case 221 and the side surface of the movable unit 223. The movable unit 223 can vibrate in the front-rear and left-right directions with respect to the fixed unit 224 by the expansion and contraction of the elastic bodies 222A to 222D.

  The upper case 225 has a cylindrical box shape with a lower surface opening. Here, a bearing 225A is provided as a circular hole at a substantially central position on the inner bottom surface of the upper case 225, and a coil receiver 225B is provided around the bearing 225A so as to be recessed.

  The upper case 225 is disposed so as to cover the lower case 221, whereby the elastic bodies 222 </ b> A to 222 </ b> D, the movable unit 223, and the fixed unit 224 are accommodated between the lower case 221 and the upper case 225.

  Next, the configuration of the movable unit 223 and the fixed unit 224 will be described.

  The movable unit 223 includes a yoke 231 and magnets 233A and 233B.

  Here, the yoke 231 has a ring shape and is made of a magnetic material serving as a yoke member.

  Further, the magnets 233A and 233B are plate-like, and adjacent magnets are magnetized so that their upper surfaces have different magnetic poles. For example, the upper surfaces of the magnets 233A and 233B are magnetized to S and N poles, respectively, and the lower surfaces are magnetized to N and S poles, respectively. Here, the magnets 233A and 233B are arranged in contact with the inside of the yoke 231.

  The fixed unit 224 includes coils 241A and 241B and a shaft 242.

  Here, the coils 241A and 241B are formed by winding coil wires around the vertical direction.

  The shaft 242 has a columnar shape, and ring-shaped protrusions 242A and 242B are provided at predetermined intervals in the vertical direction around the side surface and viewed from above. The coil 241A is inserted into the shaft 242 from above until it contacts the protrusion 242A, and the coil 241B is inserted from below until it contacts the protrusion 242B.

  Here, the movable unit 223 and the fixed unit 224 are combined so that the magnets 233A and 233B can move between the coils 241A and 241B.

  Then, both ends of the shaft 242 are inserted into the bearings 221A and 225A, the coil 241A is disposed in the coil receiver 225B, and the coil 241B is disposed in the coil receiver 221B. Thereby, the movable unit 223 and the fixed unit 224 are accommodated between the upper case 225 and the lower case 221.

  Note that the ends of the coil wires forming the coils 241A and 241B are electrically connected to external electrodes (not shown).

  In the power generation device 250 configured as described above, for example, when a user holding an electronic device walks, an external force is applied to the power generation device 250 according to the movement of the user, and the movable unit 223 is moved to the fixed unit 224. It vibrates and generates electricity. Then, electric power for operating the electronic device is supplied via the external electrode and a rectifier circuit, a storage circuit, and the like inside the electronic device.

  FIG. 12 shows a state in which the movable unit 223 has moved relative to the fixed unit 224 in the diagonally right direction as an example.

  In this way, the movable unit 223 can move relative to the fixed unit 224 until the side surface of the coil 241A contacts the inner side surface of the yoke 231, and a large movable width is ensured, and the amount of power generation can be increased. .

  Suitable materials for the lower yoke 131, the upper yoke 132, and the yoke 231 are magnetic steel plates such as conductive stainless steel and silicon steel plate, iron such as pure iron and cast iron, permalloy, ferrite, and the like.

  Examples of coil wires include polyurethane copper wires, polyester copper wires, polyamide copper wires, and the like. The coils 141A to 141D, 241A, and 241B may be formed by, for example, forming a bobbin with resin parts and winding one coil wire directly around the bobbin, or by winding a self-bonding coil wire May be formed.

  Magnets 133A to 133D, 233A, and 233B preferably have a strong magnetic force, and neodymium magnets containing neodymium, iron, and boron are suitable. In addition, it is desirable to perform rust prevention metal plating on the surface of the magnet. Further, if the magnets are magnetized with different magnetic poles on the upper surface of adjacent magnets, the magnetic poles may be S poles or N poles.

  As described above, according to the second embodiment, the elastic bodies 122A to 122D are connected to the front, rear, left and right of the lower yoke 131 serving as the yoke member, and the movable unit 123 can be vibrated from front to back and left and right with respect to the coils 141A to 141D. Therefore, power generation can be performed regardless of the direction in which the power generation device 150 is disposed.

  In addition, since the magnets 233A and 233B are sandwiched between the plurality of coils 241A and 241B, a small power generator 250 can be realized.

  The power generator according to the present invention has an advantageous effect of being suitable for thinning, and is mainly useful for supplying operating power to various electronic devices.

21, 71, 121, 221 Lower case 21A Inner bottom surface 21B, 71A, 142E, 242A, 242B Protrusion 21C, 25A, 31A, 32A Side wall 22, 122A-122D, 222A-222D Spring 22A Coil portion 22B, 22C Arm portion 22D End Portion 23, 62, 123, 223 Movable unit 24, 61, 124, 224 Fixed unit 25, 125, 225 Upper case 25B Protrusion 26A, 26B Connection terminal 27A, 27B External electrode 31, 53B, 53D, 131 Lower yoke 31B Cutting Notch portion 32, 53A, 53C, 132 Upper yoke 32B Guide portion 32C Slit 33A, 33B, 52A, 52B, 133A-133D, 233A, 233B Magnet 34 Connection plate 41, 51, 141A-141D, 241A, 241B Coil 4 A hole 42, 54 Yoke guide 42A Locking part 42B Recess 42C Front end part 42D Rear end part 42E Step part 50, 150, 250 Power generator 72 Tension coil spring 73 Buffer member 131A Side wall 131B Square hole 134 Guide path 142 Yoke guide 142A-142D Arm 221A, 225A Bearing 221B, 225B Coil receiver 231 Yoke 242 Shaft

Claims (8)

A magnet formed with a longer width in the front-rear and left-right directions than the thickness in the up-down direction, a yoke member connected to the magnet, and at least a part of the magnet or the yoke member opposed in the up-down direction. The coil includes a coil around which the coil wire is wound, and the coil is formed with a longitudinal axis as a central axis of winding and having a width in the front-rear and left-right directions longer than a thickness in the vertical direction, and the magnet and the yoke A power generation device in which members constitute a movable unit as a unit, and the movable unit vibrates with respect to the coil. The yoke member includes an upper yoke and a lower yoke, and the coil is disposed between the upper yoke and the lower yoke, and includes an elastic body provided on a side of the movable unit. The power generation device according to claim 1, which vibrates due to expansion and contraction of the elastic body. The power generator according to claim 2, further comprising a plurality of the magnets, and further comprising a connection plate disposed between the plurality of magnets. A lower case having a protrusion for holding the elastic body is further provided, and a notch is provided in the lower yoke, and when the movable unit is moved most from a neutral position, the protrusion enters inward of the notch. Item 4. The power generation device according to item 3. The power generator according to claim 2, wherein the magnet is disposed in a left-right direction of the coil, and the upper yoke and the lower yoke connected to the magnet are disposed to face the coil in a vertical direction. 3. The apparatus according to claim 2, further comprising an upper case and a lower case that are accommodated with the movable unit, the coil, and the elastic body interposed therebetween, and an external electrode that is electrically connected to the coil on the lower surface of the lower case. Power generator. The power generator according to claim 1, wherein the elastic body is connected to front, rear, left, and right of the yoke member, and the movable unit can vibrate front, rear, left, and right with respect to the coil. The power generator according to claim 1, wherein the coil is arranged with the magnet sandwiched between the upper and lower sides.

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