JP2005045988A - Pocket generator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration-power-generating device that can increase power generating efficiency, while miniaturizing and simplifying the mechanism and reducing its weight, and that can be used as a power source for a light-emitting body or a portable electronic apparatus, in a generator in which electric power is generated using kinetic energy due to vibrations caused by walking and the like. <P>SOLUTION: A support end is formed by fixing one end of a cantilever, which is structured with a spring lever to which a piezoelectric element is attached, to a box; and a weight is provided at the other end, which constitutes the free end of the spring lever, in such a way that its centroid is positioned above the support end. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

Detailed Description of the Invention

  The present invention generates power by converting a force generated by vibration during walking or the like into a distortion of a piezoelectric element to generate electric power. By carrying the present invention, a power source for a light emitter or a portable electronic device is used. The present invention relates to a portable power generation device.

  First, as a first conventional technique, in the field of wristwatches, an unbalanced vehicle whose center of rotation and center of gravity are eccentric is used to convert random motion into rotational force, and the rotational force is stored in the self-winding mechanism to store the permanent magnet and armature. A rotating magnetic field is configured to generate power and generate electric power.

  Next, in the second conventional technique, there is a technique in which a piezoelectric element is provided on a shoe sole and a voltage generated by pressure applied to the walking support is used as a power source of the illuminant. It is a power generation mechanism that converts to

Problems to be solved by the invention

  However, since the power generation means according to the first conventional technique uses an unbalanced vehicle or a self-winding mechanism, there is a drawback that the manufacturing cost is increased.

  Next, in the second conventional technique, since the position where the piezoelectric element is provided is limited to the shoe sole, there is a problem that the range and method in which the power generated by power generation can be used are limited, and the present invention has the above disadvantages. It was made to solve the problem.

Means for solving the problem

  In the present invention, means for efficiently converting vibrations during walking into pendulum motion and means for causing deflection in a cantilever composed of a suspended piezoelectric element and a spring lever are used as means for solving the above problems. First, as a first feature of the present invention, one end of a cantilever made of a spring lever to which a piezoelectric element is fixed is fixed to a housing to form a support end, and the other end serving as a free end of the spring lever is formed. This is a portable electric device provided with a weight having a center of gravity located above the support end.

  Next, a second feature of the present invention is a portable power generation device in which a coupling portion is provided on the housing in the first feature, and the housing is suspended from a suspension support portion via the coupling portion.

  Next, as a third feature of the present invention, there is provided a portable power generation device characterized in that the coupling portion in the second feature is provided on the free end side of the housing.

  Next, as a fourth feature of the present invention, there is provided a portable power generation device in which a weight is provided at the support end portion of the cantilever in the second or third feature or the fixing portion of the housing for fixing the support end. .

  Next, as a fifth feature of the present invention, in any one of the second to fourth features, one end of a cable member such as a wire is attached to a hanging support portion, and the other end of the rope member is fixed to a coupling portion. This is a portable power generation device.

  Next, a sixth feature of the present invention is a portable power generation device according to any one of the second to fifth features, wherein an uneven portion is provided on a part or all of the outside of the housing.

  Next, as a seventh feature of the present invention, there is provided a portable power generation device in which the gravity center position of the weight provided on the free end side is provided at a position horizontal to the support end in any one of the second to sixth features. .

  Next, as an eighth feature of the present invention, in any one of the second to seventh features, a rectifying mechanism that rectifies an alternating voltage generated by the piezoelectric element, and a voltage that is converted into a direct current by the rectifying mechanism is stored. This is a portable power generation device in which the charging mechanism is provided inside the housing and at a position adjacent to the support end of the cantilever.

  Next, as a ninth feature of the present invention, in any one of the first to seventh features, a rectifying mechanism that rectifies an alternating voltage generated by the piezoelectric element, and a voltage that is converted into a direct current by the rectifying mechanism is stored. It is a portable power generation device provided with a charging mechanism.

  Hereinafter, embodiments of the present invention will be described. First, the structure shown in FIG. 1 to FIG. 5 is a light emitting device. The power generation mechanism will be described below. As shown in FIG. 3, the piezoelectric element a1 is fixed to the spring lever a2, and the spring lever a2 One end serving as a support end is fixed to the housing a7 via the spacer a3 and the spacer b5, and the weight 4 is provided at the other end serving as the free end of the spring lever a2 so that the center of gravity of the weight 4 is above the support point. (Claim 1).

  Next, the light emitting mechanism has a configuration in which the LED 11 is connected to the piezoelectric element a1 through the full-wave rectifier 6 as shown in FIG.

  Next, the configuration shown in FIG. 5 is such that a capacitor 12 that is a power storage mechanism is connected to the piezoelectric element a1 via the full-wave rectifier 6, and the capacitor 12 and the LED 11 are connected via a switch.

  Next, the function of the present invention will be described. The power generation is performed by carrying the present invention by vibration during walking, and the graph showing the vertical movement during walking is a graph shown in FIG. In this graph, t is time and x is the position of the present invention. From this graph, it can be seen that the speed in the upward direction is about twice the speed in the downward direction. The present invention pays attention to the difference in speed, and obtains an effect by providing the center of gravity of the weight, which is the pendulum motion, upward. In addition, this structure shall set it as an appropriate amplitude by adjusting the shape and material of spring-like lever a2, and shall synchronize with the vibration at the time of a walk.

  Next, referring to FIG. 7 and FIG. 8, FIG. 7 shows a state at a stationary position, FIG. 8 is a diagram showing a state when starting to return on the lower side, and the state shown in FIG. This is the position at which the downward force is applied to the weight 4 and the deflection of the spring-like lever a2 increases and begins to return. In this state, the upward force is applied and the resultant force is combined with the return motion. Will be deflected upward. The vibration direction A indicates the direction of the force that becomes the return motion, and the center of gravity G is disposed so as to be located above the fulcrum at the stationary position as shown in FIG.

  Next, the state shown in FIG. 9 is a view showing a state where the deflection of the spring-like lever a2 increases and starts to return in the upper direction. In this state, a downward force acts on the weight 4 and the pendulum motions. Energize. The vibration direction B indicates the direction of the force that becomes the return motion at this time.

  Next, FIG. 10 is a diagram showing the vibration direction A and the vibration direction B, and by comparing these, the mechanism converts the force acting upward in the lower position corresponding to the vibration direction A into a pendulum motion. It can be seen that this is a configuration that places particular emphasis on.

  As described above, the speed in the upward direction in vibration during walking is twice the speed in the downward direction, which is four times the force in terms of force, and this mechanism efficiently uses this upward force. The effect is obtained by converting it into a pendulum motion. The spring-like lever a2 bends due to the pendulum motion, and the piezoelectric element a1 is distorted to generate a voltage.

  Next, the stopper function of this configuration will be described with reference to FIG. 1 and FIG. 2. If a large force is applied to the piezoelectric element a1, which is a ceramic material, due to the pendulum movement of the weight 4, there is a problem that it breaks. However, this can be solved by adjusting the position so that the upper and lower parts inside the housing a7 abut the weight part when the amplitude of the pendulum is large, and suppressing the deflection of the spring lever a2.

  Next, in the configuration shown in FIG. 4, the AC voltage generated by the piezoelectric element a1 is converted into a direct current by the double-wave rectifier 6 to drive the LED 11, and an example in which a capacitor 12 and a switch are added to this configuration is shown in FIG. In this case, the voltage converted into a direct current by the both-wave rectifier 6 is charged in the capacitor 12 and the LED 11 is driven through the switch. With this configuration, the present invention can be used as a power source for a flashlight, and the LED 11 having this configuration can be replaced with a portable electronic device as a power source for these.

  In addition, white LED can be driven by connecting the pressure | voltage rise mechanism using a transistor, a coil, etc. in the structure of FIG. 5 to the capacitor | condenser 12 via a switch. It should be noted that an electric double layer capacitor or a secondary battery can be used for the capacitor 12 which is a power storage mechanism.

  Next, in the configuration shown in FIG. 11, the coupling portion 8 is provided in the housing a7 having the configuration shown in FIGS. 1 and 2, one end of the cord material 9 is fixed to the coupling portion 8, and the other end of the cord material 9 is suspended. It is the structure attached to the suspension fixture 10 via 13 (Claim 2).

  Next, the function of the present invention will be described with reference to FIG. 11. The present invention is a means for generating a deflection in a cantilever consisting of a piezoelectric element that vibrates both ends in a suspended state and a spring lever a2. It is. Due to the vibration, the weight 4 vibrates and becomes a force in the vibration direction C, and this force also becomes a rotational force of the support end portion with the point E being a bending portion of the rope member 9 as a fulcrum. However, at this time, the weights of the spacers a3, b5, etc. become the rotational force in the rotational direction D with the point E as the fulcrum, and the rotational force in the support end and the rotational force in the rotational direction D are opposed to rotate the housing a7. The bending of the restraining spring lever a2 can be used, and the deflection can be used as a distortion of the piezoelectric element a1 to generate a voltage.

  In addition, about the arrangement position of the weight 4 of this structure, the vibration at the time of a walk is efficiently made into a pendulum movement by providing the gravity center position of the weight 4 above a fulcrum similarly to the structure shown in the said FIG.1 and FIG.2. Can be converted.

  Next, the position where the coupling portion 8 is provided will be described. The rotational force of the housing a7 due to the force in the vibration direction C of the weight 4 and the rotational force in the rotational direction D of the spacers a3 and b5 are opposed to each other. 11, a coupling portion 8 is provided at a position on the free end side of the housing a <b> 7 (claim 3).

  With this arrangement, the distance between the fulcrum E and the spacers a3 and b5 can be increased and the rotational force in the rotational direction D can be increased. Therefore, the weight of the spacers a3 and b5 having functions as weights is reduced. This is effective in reducing weight. This arrangement also has an effect of suppressing the rotation of the housing a7 caused by the change in the center of gravity of the weight 4 due to the pendulum movement.

  Next, the arrangement position of the full-wave rectifier 6 is provided so as to be adjacent to the spacer a3 and the spacer b5. With this arrangement, the weight of the full-wave rectifier 6 is added to the weight of the spacer a3 and the spacer b5 to form a weight. As described above, this is effective in reducing the weight. In addition, when a booster mechanism or a power storage mechanism is provided, a weight can be provided by providing it at this position (claim 8).

  The configuration shown in FIG. 11 uses the spacers a3 and b5 as weights. However, by providing weights on the support end side, the spacers can be omitted and the spring lever a2 can be fixed directly to the housing a7. (Claim 4).

  Next, the rope 9 connecting the suspension support 10 and the housing a7 will be described. The suspension 9 transmits the vibration of the suspension support 10 to the coupling portion 8 and is formed using an elastic material such as a wire. By transmitting the downward force acting on a7 as the deflection of the cable member 9, it can be transmitted to be the movement of the casing a7. Furthermore, by fixing and attaching the rope member 9 and the connecting portion 8, it is possible to suppress the rotation of the housing a7 in the vibration in the lateral direction and to generate a force in the vibration direction C and the rotation direction D (Claim 5).

  The weight of the support end, the arrangement position of the suspension support 10, the elasticity of the rope member 9, the attachment method to the coupling portion 8 and the like are for suppressing the rotation of the housing a7 during vibration and causing the spring lever a2 to bend. This is a means, and this effect can be obtained by the shape and material of the outside of the housing a7. For example, when the present invention is suspended from a saddle or the like, the outside of the saddle body a7 and the saddle surface are in sliding contact. Therefore, by providing a concave portion or a convex portion on the outer side of the housing a7, the friction of the sliding contact portion can be further strengthened, and the effect can be enhanced. Further, the same effect can be obtained by forming the outside of the housing a7 with a material having a high coefficient of friction such as rubber (claim 6).

  In addition, the configuration in which the concavo-convex portion is provided on the outer side of the housing a7 is also effective when used as a key holder attached to the key of an automobile. The remote controller can generate and store electricity by vibration during driving, and can open and close a flashlight or a door. It is also possible to use a power source. In this case, the effect can be enhanced by forming a recess on the outside of the housing a7 so as to come into contact with the bulging portion below the engine key insertion portion of the automobile.

  In addition, when hanging on the heel or the like, the vibration during walking is used. In this case, the gravity center position of the weight 4 is provided above the support end in order to use vibration during driving of the automobile. Unlike the arrangement, the effect can be enhanced by providing the position of the center of gravity of the weight 4 at a position that is horizontal to the support end (claim 7).

  Next, the configuration shown in FIG. 12 is a first variation example for reducing the size of the present invention, and is an example in which the casing a7 is replaced with a casing b14 having a small shape.

  Next, the configuration shown in FIG. 13 is a second variation example for reducing the size of the present invention. The piezoelectric element a1 is replaced with a smaller piezoelectric element b15, and the spring-like lever a2 is also small. This is an example of replacing the spring lever b16. With this configuration, the present invention can be miniaturized and can be used as a key holder type.

  Next, the embodiment of the present invention will be described. First, the first embodiment is configured to be the light emitting device shown in FIGS. 1 to 5, and the weight 4 shown in FIGS. 1 and 2 has a weight of 5 g. The spring-like lever a2 for fixing the piezoelectric element a1 is a hardened steel plate having a span of 40 mm and a thickness of 0.1 mm, and the average width is 10 mm. The center of gravity of the weight 4 is provided so as to be located 10 ° above the support end. Next, as shown in FIG. 4, a full wave rectifier 6 is connected to the piezoelectric element a1, and the full wave rectifier 6 is a light emitting element. The LED 11 is connected.

  The amplitude due to vibration during walking of this configuration is 10 to 20 mm, and the generated voltage is approximately 0.5 V to 3 V. The amplitude and the generated voltage are about 30% to 50% higher than when the center of gravity of the weight 4 is arranged so as to be horizontal with the support end. As for the generated voltage, the amplitude increases and the generated voltage becomes high when the pendulum motion and the vibration are synchronized. The voltage is driven by the LED 11 with approximately two vibration cycles.

  Next, the second embodiment is configured as shown in FIG. 5, and an electrolytic capacitor having a capacitance of 33 μF is used as the capacitor 12. As a result of measuring the power generation by vibration during walking as described above, the result is about 12 steps of walking. The stored voltage is about 2 V, and is a voltage that can drive the LED 11 (Claim 9).

  Next, the third embodiment is configured as shown in FIG. 11, and a connecting portion 8 is provided in the housing a <b> 7 in the first embodiment, and the suspension fixture 10 is attached to one end of the rope member 9 via the suspension support portion 13. It is the structure which attached and attached the other end of the rope 9 to the coupling | bond part 8, The weight 4 weight of this structure is 5g, and the weight of the spacer a3 and the spacer b5 is 4g. A wire having a wire diameter of 1.5 mm is used for the rope member 9.

  In this configuration, since the housing a7 is suspended, the housing a7 moves randomly due to vibration during walking, the amplitude of the weight 4 also changes according to the motion, and the generated voltage is high or low. The measurement result is approximately 0.5V to 3V.

  The movement of the housing a7 in this configuration is complicated, but the point is the angle of a straight line connecting the force in the vibration direction c and the rotation direction D, the center of gravity of the weight 4 and the support point, and the spacer a3, the spacer b5 and the point E The effect can be enhanced by adjusting the distance and the weight of each part.

The invention's effect

  As described above, the portable power generation device of the present invention efficiently converts vibrations during walking or the like into electric power, and can be attached to a bag or the like in a suspension-supported configuration. Any electronic device that can do this can be combined with the present invention. Furthermore, since the present invention has a small and simple configuration, it can be manufactured with a small number of processes, and the manufacturing cost can be kept low. In addition, the present invention can be used as a traffic safety measure by attaching the present invention to a umbrella or a school bag as a light emitting device. As described above, the present invention generates power by vibration during walking of a human being carried, so that the functions of portable electronic devices and light-emitting devices can be maintained even in areas or places where no battery or power is supplied. Is possible.

  BRIEF DESCRIPTION OF THE DRAWINGS It is the front view which made a part the cross section of embodiment which shows the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a disassembled perspective view of embodiment which shows the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a principal part disassembled perspective view of embodiment which shows the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a figure which shows the connection system of the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a figure which shows the connection system of the portable electric power generating apparatus concerning the 2nd Example of this invention.   It is a graph which shows the vibration at the time of walking.   It is a principal part front view of embodiment which shows the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a principal part front view of embodiment which shows the pendulum located in the downward direction of the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a principal part front view of embodiment which shows the pendulum located above the portable electric power generating apparatus concerning the 1st Example of this invention.   It is a figure which shows the motion direction of the pendulum of the portable electric power generating apparatus concerning the 1st Example of this invention.   It is the front view which carried out the cross section of one part of embodiment which shows the portable electric power generating apparatus concerning the 2nd Example of this invention.   It is the front view which carried out the cross section of one part of embodiment which shows the 1st modification of the portable electric power generating apparatus of this invention.   It is a principal part disassembled perspective view of embodiment which shows the 2nd modification of the portable electric power generating apparatus of this invention.

Explanation of symbols

1 Piezoelectric element a
2 Spring lever a
3 Spacer a
4 weight 5 spacer b
6 Full-wave rectifier 7 Housing a
8 Connecting portion 9 Rope 10 Hanging support 11 LED
12 Capacitor 13 Suspension support 14 Housing b
15 Piezoelectric element b
16 Spring lever b

Claims (9)

  One end of a cantilever beam composed of a spring lever to which a piezoelectric element is fixed is fixed to the housing to form a support end, and a weight having a center of gravity located above the support end is provided at the other end of the spring lever that is a free end. A portable power generator characterized by that.   2. The portable power generator according to claim 1, wherein a coupling portion is provided on the housing, and the housing is suspended from the suspension support portion via the coupling portion.   3. The portable power generator according to claim 2, wherein the coupling portion is provided on the free end side of the housing.   4. The portable power generation device according to claim 2, wherein a weight is provided at a support end portion of the cantilever and a fixing portion of a housing that fixes the support end.   The portable power generator according to any one of claims 2 to 4, wherein one end of a cable member such as a wire is attached to the suspension support part, and the other end of the rope member is fixed to the coupling part.   The portable power generation device according to any one of claims 2 to 5, wherein a concavo-convex portion is provided on a part or all of the outside of the housing.   7. The portable power generator according to claim 2, wherein a gravity center position of a weight provided on the free end side is provided at a position horizontal to the support end.   The rectifying mechanism for rectifying the AC voltage generated by the piezoelectric element and the charging mechanism for storing the DC voltage generated by the rectifying mechanism are inside the housing and cantilevered. A portable power generation device provided at a position adjacent to the support end of the power generation device.   8. The portable power generation device according to claim 1, further comprising: a rectifying mechanism that rectifies an AC voltage generated by the piezoelectric element; and a charging mechanism that stores a voltage converted into a direct current by the rectifying mechanism.

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