WO2015019779A1

WO2015019779A1 - Vibration power generation device

Info

Publication number: WO2015019779A1
Application number: PCT/JP2014/068312
Authority: WO
Inventors: 貴春加藤; 良明深井
Original assignee: スター精密株式会社
Priority date: 2013-08-05
Filing date: 2014-07-09
Publication date: 2015-02-12
Also published as: CN105359395A; JP6142723B2; JP2015033266A

Abstract

A vibration power generation device configured so as to utilize vibration in the vertical direction and generate induced electromotive force and which effectively suppresses generation of impact noise as a result of having a compact configuration. A magnetic circuit unit (40) arranged so as to surround a coil holder (30), having a configuration so as to be supported in a suspended manner relative to a case (20), via a coil spring (12), and so as to generate induced electromotive force in a conduction coil (32) supported by the coil holder (30) as a result of the vibration of same in the vertical direction. The clearances (C1, C3) between the magnetic circuit unit (40) and the coil holder (30) are set so as to be smaller than the clearances (C2, C4) between the magnetic circuit unit (40) and the case (20). As a result, the magnetic circuit unit (40) is prevented from coming in contact with the case (20) and the generation of large impact noise is prevented. Furthermore, no application of shock-absorbing tape, etc., on the inner peripheral surface of the case (20) is required, as a result, and the case (20) does not increase in size.

Description

Vibration power generator

The present invention relates to a vibration power generator configured to generate an induced electromotive force using vertical vibration.

2. Description of the Related Art Conventionally, a portable vibration power generation apparatus configured to automatically generate power by a human walking motion or the like is known.

For example, “Patent Document 1” discloses a vibration power generator configured to generate an induced electromotive force in a conductive coil by causing a magnetic circuit unit to vibrate in a vertical direction with respect to a coil holder that supports the conductive coil. Are listed.

In this vibration power generator, a pair of guide shafts extending in the vertical direction are arranged on the left and right sides of the coil holder, the magnetic circuit unit is slidably attached to both guide shafts, and a pair of coil springs are provided. Via the upper end of the coil holder. In this vibration power generator, the magnetic circuit unit is vibrated in the vertical direction by utilizing the elastic deformation of both coil springs.

Special table 2008-543254 gazette

If the magnetic circuit unit is suspended and supported by the coil holder via the coil spring as in the vibration power generation apparatus described in the above-mentioned “Patent Document 1”, the apparatus configuration can be relatively simplified.

However, this vibration power generator has the following problems because the magnetic circuit unit is configured to slide in the vertical direction with respect to each of the pair of guide shafts.

That is, if the positional relationship accuracy between the two guide shafts and the dimensional accuracy of the pair of guide shaft insertion holes formed in the magnetic circuit unit are not sufficiently secured, a large frictional resistance is generated during sliding. As a result, the magnetic circuit unit is not vibrated smoothly, and the power generation efficiency is lowered accordingly.

On the other hand, if the guide shaft is abolished as a vibration power generation device, the magnetic circuit unit can be smoothly vibrated in the vertical direction, and the device configuration can be simplified.

However, in general, a portable vibration power generator has a configuration in which a coil holder and a magnetic circuit unit are accommodated in a case. Therefore, when the guide shaft is eliminated, the magnetic circuit unit vibrates in the vertical direction. The unit is freely displaced in the lateral direction and comes into contact with the case. At this time, since the case is exposed to the external space, there is a problem in that when the magnetic circuit unit strongly contacts the case, a loud collision sound is generated, which gives the user a sense of incongruity.

For this reason, it is necessary to take measures such as applying shock absorbing tape to the inner peripheral surface of the case, but in this case, a space for accommodating the shock absorbing tape is required in the case. Therefore, there is a problem that the case becomes large and the vibration power generator cannot be configured in a compact manner.

The present invention has been made in view of such circumstances, and in a vibration power generator configured to generate an induced electromotive force using vertical vibration, a compact configuration can reduce the impact sound. It is an object of the present invention to provide a vibration power generator that can effectively suppress generation.

The present invention is intended to achieve the above object by devising the clearance between the magnetic circuit unit, the coil holder and the case.

That is, the vibration power generator according to the present invention is
A coil holder that supports the conductive coil and a magnetic circuit unit that is suspended and supported by the coil holder or the case via a coil spring are accommodated in the case, and the magnetic circuit unit is vertically moved with respect to the coil holder. In a vibration power generator configured to generate an induced electromotive force in the conductive coil by vibrating in a direction,
The coil holder is composed of a plate-like member arranged to extend in the vertical direction,
The magnetic circuit unit is formed so as to surround both the front and rear sides and the left and right sides of the coil holder,
The clearance between the magnetic circuit unit and the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case.

As long as the “coil holder” is composed of a plate-like member arranged so as to extend in the vertical direction, the specific configuration such as the horizontal sectional shape and the length in the vertical direction is not particularly limited. .

The above-mentioned “magnetic circuit unit” does not necessarily have to be formed so as to surround the entire circumference of the coil holder as long as it is formed so as to surround both the front and rear surfaces and the left and right surfaces of the coil holder.

“The clearance between the magnetic circuit unit and the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case” means that the magnetic circuit unit is displaced in either the front, back, left, or right direction. Even in this case, it means that the magnetic circuit unit is set to a value that contacts the coil holder and does not contact the case before being displaced to a position where the magnetic circuit unit contacts the case.

As shown in the above configuration, the vibration power generator according to the invention of the present application is such that the magnetic circuit unit suspended and supported by the coil holder or the case via the coil spring vibrates in the vertical direction, so that the conductive coil supported by the coil holder Since the configuration is such that an induced electromotive force is generated, the magnetic circuit unit can be smoothly vibrated in the vertical direction with a simple configuration.

In the vibration power generator according to the present invention, the coil holder is configured by a plate-like member arranged so as to extend in the vertical direction, and the magnetic circuit unit surrounds both the front and rear surfaces and the left and right side surfaces of the coil holder. However, since the clearance between the magnetic circuit unit and the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case, the following operational effects can be obtained.

That is, in the configuration in which the magnetic circuit unit is suspended and supported as in the vibration power generation device according to the present invention, when the conventionally used guide shaft is abolished, when the magnetic circuit unit vibrates in the vertical direction, the magnetic circuit The unit is freely displaced in the lateral direction.

However, in the vibration power generator according to the present invention, since the clearance between the magnetic circuit unit and the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case, the magnetic circuit unit contacts the coil holder. Even if there is a thing, it does not contact the case. At that time, even if the magnetic circuit unit comes into contact with the coil holder, since both members are housed in the case, a loud collision sound like when the magnetic circuit unit comes into contact with the case is not generated. Absent.

Therefore, it is not necessary to take a countermeasure such as attaching a shock absorbing tape to the inner peripheral surface of the case, and the case can be prevented from being enlarged, so that the vibration power generator can be configured compactly.

As described above, according to the present invention, in the vibration power generator configured to generate the induced electromotive force using the vertical vibration, the generation of the collision sound can be effectively suppressed by the compact configuration. it can.

In addition, in the vibration power generation device according to the present invention, since a conventionally used guide shaft is not required, the power generation efficiency can be increased while simplifying the device configuration.

In the above configuration, when a pair of coil springs are arranged on both the left and right sides of the coil holder, and a pair of projecting portions that project to the left and right sides are formed in the lower region of the coil holder, Such effects can be obtained.

That is, within the movable range when the magnetic circuit unit vibrates in the vertical direction, the clearance between the magnetic circuit unit and each overhang portion of the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case. It is possible to easily secure a space for arranging a pair of left and right coil springs between the upper region of the coil holder and the case. As a result, the size reduction of the vibration power generator can be further promoted.

In the above configuration, if the clearance between the magnetic circuit unit and the coil holder is set to a value smaller than the clearance between the magnetic circuit unit and the case, the specific values of both are not particularly limited. Is set to a value less than or equal to 1/2 of the latter, the magnetic circuit unit abuts against the case after allowing for some manufacturing errors and assembly errors of each member constituting the vibration power generator. Can be prevented in advance.

In the above configuration, if the space in the case is sealed, it is possible to prevent the sound generated when the magnetic circuit unit comes into contact with the coil holder from leaking into the external space of the case. it can. As a result, it is possible to maximize the noise reduction of the vibration power generator.

The partial cross section front view which shows the vibration electric power generating apparatus which concerns on one Embodiment of this invention II-II sectional view of FIG. 1 is a partial cross-sectional front view showing the main part of FIG. Sectional view taken along line IV-IV in FIG. Rear view showing the case body of the vibration power generator as a single item It is a fragmentary sectional front view which shows the said vibration electric power generating apparatus, Comprising: (a) is a figure which shows the state which has a magnetic circuit unit in a neutral position, (b) shows the state which the magnetic circuit unit displaced to the upper side from the neutral position. FIG. 4C is a diagram showing a state in which the magnetic circuit unit is displaced downward from the neutral position. Front view showing two modifications of the coil holder of the vibration power generator The same figure as FIG. 1 which shows the modification of the said vibration electric power generating apparatus.

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

FIG. 1 is a partial sectional front view showing a vibration power generation apparatus 10 according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II. 3 is a partial cross-sectional front view showing the main part of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line IV-IV.

As shown in these drawings, the vibration power generation apparatus 10 according to the present embodiment is supported in a case 20 suspended from a coil holder 30 that supports a conductive coil 32 and a pair of coil springs 12 with respect to the case 20. The magnetic circuit unit 40 and a pair of left and right light emitting diodes 50 are accommodated.

In the vibration power generation apparatus 10, the magnetic circuit unit 40 vibrates in the vertical direction with respect to the coil holder 30, thereby generating an induced electromotive force in the conductive coil 32 and causing both the light emitting diodes 50 to emit light alternately. ing. At that time, the vibration in the vertical direction of the magnetic circuit unit 40 is performed when the vibration power generation apparatus 10 is carried in a state of being mounted on a bag, a school bag, clothes, or the like. The acceleration of the vertical vibration generated at this time is 1 G or less, and each coil spring 12 has a spring constant having a value corresponding to the vibration acceleration.

Next, a specific configuration of the vibration power generator 10 will be described.

First, the configuration of the case 20 will be described.

The case 20 has a vertically long rectangular front shape and is formed with a constant front-rear width. The case 20 includes a case main body 22 and a cover 24.

The case body 22 is configured as a resin box-shaped member formed so as to open rearward. On the other hand, the cover 24 is configured as a resin plate-like member, and is arranged so as to close the opening of the case body 22 from the rear side. At this time, the cover 24 is completely sealed with respect to the case main body 22 over the entire circumference. This sealing is performed by, for example, adhesion or welding.

FIG. 5 is a rear view showing the case main body 22 as a single item.

As shown in the figure, the case body 22 has a configuration in which mounting brackets 22a are formed on a pair of left and right side walls. The pair of left and right mounting brackets 22a mounts the vibration power generator 10 to a bag or the like in a state where a belt or the like is passed through a vertically long opening formed between the mounting bracket 22a and the case body 22. Is for.

The case body 22 is formed with a constant thickness, but the upper end and the lower end of the front wall are formed as

thick portions

22b and 22c, respectively.

A pair of locking pins 22d protruding rearward are formed at the left and right corner portions of the case main body 22 in the upper thick portion 22b. Further, a portion located between the pair of left and right locking pins 22d in the thick wall portion 22b is formed so as to protrude downward in a substantially rectangular shape, and the case main body 22 is provided in the front-rear direction at the center portion thereof. A pair of left and right circular holes 22e penetrating therethrough is formed.

On the other hand, a rib 22f that protrudes rearward is formed at the central portion in the left-right direction of the lower thick portion 22c. The rib 22f has a reverse U-shaped cross section.

Cushion materials

26 and 28 extending in a strip shape in the left-right direction are attached to the lower surface of the upper thick portion 22b and the upper surface of the lower thick portion 22c, respectively. As shown by a two-dot chain line in FIG. 2, the pair of upper and

lower cushion members

26 and 28 come into contact with each other when the magnetic circuit unit 40 vibrates in the vertical direction and the amplitude exceeds a certain value. It is elastically deformed, thereby restricting the magnetic circuit unit 40 from vibrating with an overamplitude, and reducing the impact force at the time of contact.

Next, the configuration of the coil holder 30 will be described.

As shown in FIGS. 1 to 4, the coil holder 30 is composed of a plate-like member disposed so as to extend in the vertical direction at the center in the case 20.

The coil holder 30 has a vertically long rectangular outer shape when viewed from the front, and a pair of projecting portions 30a projecting to the left and right sides are formed in the lower region. Each of the overhang portions 30a is set so that the position of the upper end edge 30a1 thereof is set at substantially the same height as the center position of a coil housing portion 30Aa described later, and is formed so as to overhang with a constant width to the lower end position of the coil holder 30. ing. At this time, the upper end edge 30a1 of each of the overhang portions 30a is formed to extend obliquely downward toward the left and right sides.

The length of the coil holder 30 in the vertical direction is set to be slightly smaller than the internal dimension of the case body 22 in the vertical direction. And this coil holder 30 is being fixed to the case main body 22 in the state inserted in the case main body 22 from the back side to the position which the upper and lower both ends contact | abut to the

thick parts

22b and 22c of the case main body 22. .

This fixing is performed by bringing the upper and lower ends of the coil holder 30 into contact with the

thick portions

22b and 22c in a state where the adhesive A is applied to the rear surfaces of the

thick portions

22b and 22c in advance. Yes. At this time, an inverted U-shaped recess 30 b is formed at the left and right center position of the lower end surface of the coil holder 30, and the coil holder 30 is engaged by engaging the recess 30 b with the rib 22 f of the case body 22. The positioning in the left-right direction is intended.

The coil holder 30 includes a holder main body 30A in which a coil housing portion 30Aa for housing the conductive coil 32 and a board housing portion 30Ab for housing the circuit board 34 are formed, and the front and rear surfaces of the holder body 30A. And two friction reduction films 30B attached to the entire area excluding the substrate housing portion 30Ab. At that time, the holder main body 30A is made of general-purpose resin such as ABS resin, while each friction reducing film 30B is made of ultrahigh molecular weight polyethylene film.

The coil housing portion 30Aa is formed at a position slightly displaced downward from the vertical center position of the holder body 30A. Specifically, this position is set at the center position between the lower surface of the upper thick portion 22b and the upper surface of the lower thick portion 22c in the case main body 22.

The coil housing portion 30Aa has a horizontally oblong inner peripheral surface shape. And the conductive coil 32 accommodated in this coil accommodating part 30Aa has a horizontally long oval winding shape that is slightly smaller than the inner peripheral surface shape.

On the other hand, the substrate housing portion 30Ab is formed at the upper end of the holder body 30A.

The substrate housing portion 30Ab has a horizontally elongated inner peripheral surface shape. A pair of left and right light emitting diodes 50 are mounted on the front surface of the circuit board 34 accommodated in the substrate accommodating portion 30Ab.

Each of the light emitting diodes 50 has a bullet-shaped outer shape having an outer diameter slightly smaller than the inner diameter of the pair of left and right circular holes 22e formed in the thick portion 22b of the case body 22. The pair of left and right light emitting diodes 50 are inserted into the pair of left and right circular holes 22e when the coil holder 30 is fixed to the case body 22, and the tip positions thereof are substantially the same as the front surface of the thick portion 22b. It is arranged to be one.

As described above, since the coil holder 30 is in contact with the rear surface of the thick portion 22b of the case body 22 via an adhesive, a pair of left and right circular holes 22e is formed in the thick portion 22b. Nevertheless, the space in the case 20 is sealed.

A pair of left and right groove portions 30Ac extending in the vertical direction from the coil housing portion 30Aa to the substrate housing portion 30Ab is formed on the rear surface of the holder body 30A. Each of the pair of coil terminals 32 a extending from the conductive coil 32 is inserted into each of the groove portions 30Ac and led to the circuit board 34.

Next, the configuration of the magnetic circuit unit 40 will be described.

The magnetic circuit unit 40 is formed so as to surround both the front and rear surfaces and the left and right surfaces of the coil holder 30.

The magnetic circuit unit 40 includes a pair of yokes 44 disposed on both front and rear sides of the coil holder 30, and a pair of upper and lower magnets 42 are attached to the inner side surfaces of the yokes 44. Yes.

Each magnet 42 is an N-48 neodymium magnet and has a horizontally long rectangular parallelepiped shape.

Each yoke 44 is made of a soft iron plate and has a laterally long rectangular outer shape when viewed from the front. Each of the yokes 44 includes a flange portion 44a extending from the one side end portion so as to be bent at a right angle, and comes into contact with the other yoke 44 at the front end surface of the flange portion 44a. A small hole 44b that penetrates the flange 44a in the left-right direction is formed at the upper end of the flange 44a in each of the yokes 44.

A pair of upper and lower magnets 42 are attached to each yoke 44 in a state where both magnets 42 are positioned and supported at predetermined intervals in the vertical direction by a magnet holder 46 fixed to each yoke 44 by adhesion or the like. Yes.

Each of these magnet holders 46 is composed of a nonmagnetic metal plate (for example, a brass plate) having a laterally long rectangular outer shape when viewed from the front. At this time, the magnet holders 46 are formed with the same height as the yokes 44. In the magnet holder 46, two horizontally long rectangular through holes 46a are formed at predetermined intervals in the vertical direction. Each magnet 42 is attracted to each yoke 44 by a magnetic force in a state where the magnet 42 is fitted in each of the through holes 46 a and the inner side surface thereof is substantially flush with the inner side surface of each magnet holder 46. Yes.

At that time, the pair of upper and lower magnets 42 attached to each yoke 44 is arranged in a state where the polarities are reversed. In addition, the pair of upper and lower magnets 42 is in a state where the polarities are reversed between the pair of front and rear yokes 44 (that is, in a state where the polarities of the two pairs of upper and lower magnets 42 are matched with each other in the positional relationship between the two). Has been placed.

As a result, in this magnetic circuit unit 40, a magnetic circuit that generates a magnetic flux across the space between each pair of magnets 42 is formed by the two pairs of upper and lower magnets 42 and a pair of front and rear yokes 44. ing.

Next, the configuration of the pair of left and right coil springs 12 will be described.

The pair of coil springs 12 are arranged so as to extend in the vertical direction on the left and right sides of the coil holder 30.

Each of the coil springs 12 is locked at its upper end to locking pins 22 d formed at the left and right corners of the upper end of the case body 22, and its lower end is locked to the small hole 44 b of each yoke 44. Has been.

In the state where the magnetic circuit unit 40 is suspended and supported by the pair of coil springs 12, the center position of the magnetic circuit unit 40 (that is, the center position of the upper and lower two sets of magnets 42) is substantially the same as the center position of the coil housing portion 30Aa. The coil length of each coil spring 12 is set so as to be the height.

As described above, the coil holder 30 has a pair of left and right overhang portions 30a formed in the lower region thereof, but the pair of coil springs 12 has an upper region of the coil holder 30 (that is, a pair of left and right overhang portions 30a). Are located on the left and right sides of the upper edge 30a1). Then, as shown in FIG. 4, these coil springs 12 are arranged in a positional relationship that partially overlaps each overhanging portion 30 a in plan view.

Further, as described above, the pair of left and right overhang portions 30a formed in the lower region of the coil holder 30 has the upper edge 30a1 positioned at substantially the same height as the center position of the coil housing portion 30Aa. Even when the magnetic circuit unit 40 comes into contact with the upper cushion member 26 by vibration in the vertical direction, the state in which the magnetic circuit unit 40 and the upper end portions of the two overhanging portions 30a overlap in the front view is maintained. Yes.

In the vibration power generation apparatus 10 according to the present embodiment, the clearance between the magnetic circuit unit 40 and the coil holder 30 is set to a value smaller than the clearance between the magnetic circuit unit 40 and the case 20.

That is, as shown in FIG. 4, the clearance C <b> 1 between each magnet 42 (or each magnet holder 46) and the front or rear surface of the coil holder 30 in the magnetic circuit unit 40 is the front wall of each yoke 44 and the case body 22. Is set to a value smaller than the clearance C2 between the portion and the cover 24.

At this time, the relationship between the clearances C1 and C2 is set to C1 ≦ 1/2 × C2. Specifically, the clearance C1 is set to a value of about C1 = 0.1 to 0.3 mm, and the clearance C2 is set to a value of about C2 = 0.6 to 1.2 mm.

In the magnetic circuit unit 40, the clearance C3 between the flange portion 44a of each yoke 44 and each overhang portion 30a of the coil holder 30 is the clearance between the flange portion 44a of each yoke 44 and the side wall portion of the case body 22. A value smaller than C4 is set.

At this time, the relationship between the clearances C3 and C4 is set to C3 ≦ 1/2 × C4. Specifically, the clearance C3 is set to a value of about C3 = 0.1 to 0.4 mm, and the clearance C4 is set to a value of about C4 = 0.8 to 1.6 mm.

Next, the operation of the vibration power generation apparatus 10 according to this embodiment will be described.

6A and 6B are partial cross-sectional front views showing the vibration power generation apparatus 10, where FIG. 6A is a diagram illustrating a state where the magnetic circuit unit 40 is in a neutral position, and FIG. The figure which shows the state displaced to (c) is a figure which shows the state which the magnetic circuit unit 40 displaced to the downward side from the neutral position.

When the magnetic circuit unit 40 vibrates in the vertical direction with respect to the coil holder 30 and the magnetic circuit unit 40 is displaced upward from the neutral position shown in FIG. 5A, an induced electromotive force is generated in the conductive coil 32, One light emitting diode 50 emits light as shown in FIG. Thereafter, when the magnetic circuit unit 40 is displaced downward from the position shown in FIG. 4B, an induced electromotive force in the reverse direction is generated in the conductive coil 32, and the other light-emitting diode 50 as shown in FIG. Emits light.

At that time, when the magnetic circuit unit 40 is displaced upward from the neutral position by a certain value or more, the magnetic circuit unit 40 comes into contact with the upper cushion member 26, and the magnetic circuit unit 40 is moved from the neutral position to the lower side by a certain value or more. When displaced, the magnetic circuit unit 40 comes into contact with the lower cushion material 28. Thereby, it is controlled that the magnetic circuit unit 40 vibrates with an overamplitude, and the impact force at the time of the contact is relaxed, so that the generation of impact sound is effectively suppressed.

Further, as shown in FIG. 5B, even when the magnetic circuit unit 40 is displaced upward to a position where it comes into contact with the cushion material 26, the magnetic circuit unit 40 is not attached to each overhanging portion 30a of the coil holder 30 when viewed from the front. On the other hand, even when the magnetic circuit unit 40 is displaced downward to the position where it abuts against the cushion material 28 as shown in FIG. It is located above the upper end edge 30a1 of the overhanging portion 30a and does not interfere with each overhanging portion 30a.

As described above in detail, the vibration power generation apparatus 10 according to the present embodiment is supported by the coil holder 30 when the magnetic circuit unit 40 suspended and supported by the case 20 via the coil spring 12 vibrates in the vertical direction. Since the electromotive force is generated in the conductive coil 32, the magnetic circuit unit 40 can be smoothly vibrated in the vertical direction with a simple configuration.

Further, in the vibration power generation apparatus 10 according to the present embodiment, the coil holder 30 is configured by a plate-like member disposed so as to extend in the vertical direction, and the magnetic circuit unit 40 is provided on both the front and rear surfaces and the left and right sides of the coil holder 30. The clearances C1 and C3 between the magnetic circuit unit 40 and the coil holder 30 are set to be smaller than the clearances C2 and C4 between the magnetic circuit unit 40 and the case 20. The following effects can be obtained.

That is, in the configuration in which the magnetic circuit unit 40 is suspended and supported as in the vibration power generation apparatus 10 according to the present embodiment, when the conventionally used guide shaft is eliminated, the magnetic circuit unit 40 vibrates in the vertical direction. At this time, the magnetic circuit unit 40 is freely displaced in the lateral direction.

However, in the vibration power generator 10 according to the present embodiment, the clearances C1 and C3 between the magnetic circuit unit 40 and the coil holder 30 are set to values smaller than the clearances C2 and C4 between the magnetic circuit unit 40 and the case 20. Therefore, even if the magnetic circuit unit 40 contacts the coil holder 30, it does not contact the case 20. At that time, even if the magnetic circuit unit 40 abuts against the coil holder 30, both members are accommodated in the case 20, so that a loud collision noise occurs when the magnetic circuit unit 40 abuts against the case 20. There is no end to it.

Therefore, it is not necessary to take a countermeasure such as attaching an impact absorbing tape to the inner peripheral surface of the case 20, and the case 20 can be prevented from being enlarged, so that the vibration power generation apparatus 10 can be configured compactly. it can.

As described above, according to this embodiment, the vibration power generation apparatus 10 configured to generate the induced electromotive force using the vertical vibration effectively suppresses the generation of the collision sound due to the compact configuration. be able to.

In addition, in the vibration power generation apparatus 10 according to the present embodiment, since a conventionally used guide shaft is not necessary, the power generation efficiency can be increased after simplifying the apparatus configuration.

Particularly in the present embodiment, a pair of coil springs 12 are arranged on the left and right sides of the coil holder 30, and a pair of projecting portions 30 a that project to the left and right sides are provided in the lower region of the coil holder 30. Since it is formed, the following effects can be obtained.

That is, within the movable range when the magnetic circuit unit 40 vibrates in the vertical direction, the clearances C1 and C3 between the magnetic circuit unit 40 and each overhang portion 30a of the coil holder 30 are the clearances between the magnetic circuit unit 40 and the case 20. It is easy to secure a space for arranging a pair of left and right coil springs 12 between the upper region of the coil holder 30 and the case 20 while maintaining a state set to a value smaller than C2 and C4. It becomes possible. As a result, the vibration power generation apparatus 10 can be further reduced in size.

At this time, in this embodiment, the clearances C1 and C3 between the magnetic circuit unit 40 and the coil holder 30 are set to a value of 1/2 or less with respect to the clearances C2 and C4 between the magnetic circuit unit 40 and the case 20. Therefore, it is possible to prevent the magnetic circuit unit 40 from coming into contact with the case 20 while allowing a manufacturing error and an assembling error of each member constituting the vibration power generation apparatus 10 to some extent.

In this embodiment, since the space in the case 20 is sealed, the sound generated when the magnetic circuit unit 40 comes into contact with the coil holder 30 leaks into the external space of the case 20. Can be prevented in advance. As a result, it is possible to maximize the noise reduction of the vibration power generator 10.

Furthermore, in the present embodiment, the configuration of the coil holder 30 is such that the friction reducing films 30B are attached to both the front and rear surfaces of the holder body 30A, so that the dynamic friction when the magnetic circuit unit 40 contacts the coil holder 30 is used. The coefficient can be kept sufficiently small, which makes it easier to smoothly vibrate the magnetic circuit unit 40 in the vertical direction.

Further, in the present embodiment, each magnet holder 46 of the magnetic circuit unit 40 is made of a nonmagnetic metal plate, so that each magnet holder 46 effectively functions as a weight for increasing the weight of the magnetic circuit unit 40. Can be made.

In the embodiment described above, the pair of left and right overhang portions 30a formed in the lower region of the coil holder 30 is positioned from the upper end edge 30a1 at the substantially same height as the center position of the coil housing portion 30Aa to the lower end position of the coil holder 30. Although it has been described that it is formed so as to protrude with a constant width, other configurations can be adopted.

For example, like the coil holder 130 shown in FIG. 7A, a pair of left and right projecting portions 130a formed in the lower region of the upper end edge 130a1 is located at substantially the same height as the center position of the coil housing portion 30Aa. It is possible to adopt a configuration formed so as to extend to a midway position without reaching the lower end position of the coil holder 130.

Alternatively, as in the coil holder 230 shown in FIG. 7B, a pair of left and right projecting portions 230a formed in the lower region of the upper end edge 230a1 is located at substantially the same height as the center position of the coil housing portion 30Aa. It is also possible to employ a configuration formed in a tapered shape so that the amount of overhang gradually decreases from the position toward the lower end position of the coil holder 230.

Even when these

coil holders

130 and 230 are employed, the same effects as those of the above embodiment can be obtained.

In the embodiment described above, the upper end portion of each coil spring 12 has been described as being configured to be engaged with the respective engagement pins 22d of the upper end portion of the case body 22, but other configurations may be employed. Is possible.

For example, as shown in FIG. 8, the upper end portion of the holder body 330A of the coil holder 330 is formed with a locking pin 330Ad that protrudes to the left and right sides. A locked configuration is also possible.

Even when such a configuration is adopted, the same effect as that of the above embodiment can be obtained.

It should be noted that the numerical values shown as specifications in the above-described embodiment and its modifications are merely examples, and it goes without saying that these may be set to different values as appropriate.

Further, the present invention is not limited to the configurations described in the above embodiment and its modifications, and configurations with various other changes can be adopted.

DESCRIPTION OF SYMBOLS 10

Vibration power generator

12, 312 Coil spring 20 Case 22 Case main body

22a Mounting bracket

22b, 22c Thick part 22d Locking pin 22e Circular hole 22f Rib 24

Cover

26, 28

Cushion material

30, 130, 230, 330

Coil holder

30a, 130a, 230a Overhang portion 30a1, 130a1, 230a1 Upper edge 30b Recess 30A, 330A Holder body 30Aa Coil housing portion 30Ab Substrate housing portion 30Ac Groove portion 30B Friction reduction film 32 Conductive coil 32a Coil terminal 34 Circuit substrate 40 Magnetic circuit unit 42 Magnet 44 44a Flange 44b Small hole 46 Magnet holder 46a Through hole 50 Light emitting diode 330Ad Locking pin A Adhesive

Claims

A coil holder that supports the conductive coil and a magnetic circuit unit that is suspended and supported by the coil holder or the case via a coil spring are accommodated in the case, and the magnetic circuit unit is vertically moved with respect to the coil holder. In a vibration power generator configured to generate an induced electromotive force in the conductive coil by vibrating in a direction,
The coil holder is composed of a plate-like member arranged to extend in the vertical direction,
The magnetic circuit unit is formed so as to surround both the front and rear sides and the left and right sides of the coil holder,
The vibration power generator characterized in that a clearance between the magnetic circuit unit and the coil holder is set to a value smaller than a clearance between the magnetic circuit unit and the case.
A pair of coil springs are arranged on both the left and right sides of the coil holder;
2. The vibration power generator according to claim 1, wherein a pair of projecting portions projecting to the left and right sides are formed in a lower region of the coil holder.
The clearance between the magnetic circuit unit and the coil holder is set to a value of 1/2 or less with respect to the clearance between the magnetic circuit unit and the case. Vibration power generator.
The vibration power generator according to any one of claims 1 to 3, wherein a space in the case is sealed.