JP3806724B1 - Light emitting device and flashlight using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device which is compact and has high power generation efficiency and good operability by humans.
SOLUTION: A piezoelectric element that is flexible and bent in a convex manner, a support member that supports the piezoelectric element so as to be bent, and an elastic body, and the piezoelectric element is a convex portion of the piezoelectric element. When the elastic body is pressed and contracted from the piezoelectric element by applying an external force to the shaped part, and is bent into a concavely bent piezoelectric element, and the external force applied to the piezoelectric element is removed, A light emitting device and a pocketlight using the same, wherein the elastic body returns to its original shape and the piezoelectric element bent into the concave portion is bent to generate power when the piezoelectric element is restored to the convex bent piezoelectric element. An electric light is provided.
[Selection] Figure 1

Description

  The present invention relates to a light emitting device and a flashlight using the same.

  Conventionally, many inventions have been made on light emitting devices and flashlights using the same, and they are used as portable lights for walking at night, emergency lights for power outages, and the like. A normal light emitting device and a flashlight using the same include a battery or a manual generator and a charger. A device equipped with a battery has a problem of non-lighting during use due to battery consumption. A device equipped with a manual generator and a charger is composed of an electromagnetic induction generator having a magnet and a coil, and has a large number of parts. It is difficult to say that it is lightweight, small and convenient to carry. In addition, in a piezoelectric light emitting device that emits a light emitting body such as a light emitting diode using an electromotive force generated by stress applied to the piezoelectric element, in a warning lamp that is shaken by hand, the vibration and stress applied are used. A non-power-supply piezoelectric light emitting device characterized by causing a light emitter to emit light is disclosed. However, no description of the invention relating to a portable lighting device using a non-power-emitting device is found.

Japanese Patent Laid-Open No. 2001-351416

  The present invention has been made in view of such circumstances, and is a light-emitting device that is compact and has high power generation efficiency and a flashlight using the light-emitting device, and is light and small, and is particularly convenient for lighting at hand in the event of a disaster. The purpose is to provide a flashlight that does not require maintenance.

A piezoelectric element that has flexibility and is bent convexly by a compressive force; and a support member that supports the piezoelectric element so that the piezoelectric element can be bent. The piezoelectric element applies an external force to the convex portion of the piezoelectric element. When it is bent into a piezoelectric element bent into a concave when applied, and when the piezoelectric element bent into the concave is restored to a piezoelectric element bent into a convex, it is bent to generate electricity. A power generation unit;
An electrical circuit for transmitting electrical energy generated in the piezoelectric portion;
A light emitting diode that emits light with the electric energy;
A light emitting device comprising:
as well as,
A piezoelectric element that is flexible and is bent convexly by a compressive force; a support member that flexibly supports the piezoelectric element; and an elastic body, wherein the piezoelectric element is a convex shape of the piezoelectric element. By applying an external force to the part, the elastic body is pressed from the piezoelectric element and contracts, and when bending into a concavely bent piezoelectric element, and the external force applied to the piezoelectric element is removed, A power generation unit characterized in that when the elastic element returns to its original shape and the piezoelectric element bent in the concave portion is restored to the convex bent piezoelectric element, the power generation unit is bent to generate power; and
An electrical circuit for transmitting electrical energy generated in the piezoelectric portion;
A light emitting diode that emits light with the electric energy;
A light emitting device comprising:
Is provided.

  When the power generation unit of the light emitting device has the elastic body, it is preferable that the piezoelectric element is in contact with the elastic body in a state where an external force is not acting on the piezoelectric element. Furthermore, it is preferable that the piezoelectric element has a rectangular shape regardless of whether or not the elastic body is provided, and both ends in the longitudinal direction are supported by the support member. Furthermore, the piezoelectric element has a rectangular shape, and a variable force corresponding to the degree of bending of the piezoelectric element is applied in the longitudinal direction, and both ends in the longitudinal direction are supported by the support member. A configuration is preferable. The electrical circuit preferably includes a power storage unit.

  These light-emitting devices are particularly preferably a light-emitting device whose external force is the gripping force of a human or the vibration of a human hand and a flashlight using the same.

  In the present invention, a piezoelectric element bent convexly by a compressive force is bent by an external force, and when a slight external force is applied, the piezoelectric element is rapidly displaced into a piezoelectric element bent concavely. At this time, large electric energy can be generated in the piezoelectric element, and furthermore, the elastic constant of the piezoelectric element itself as a leaf spring and the elastic constant of the elastic body can be appropriately selected for both large and small external forces. High efficiency and high voltage corresponding to external force can be obtained. Moreover, even if the piezoelectric element and the elastic body are arranged so as to overlap in the direction in which the pressing force is applied, there is an effect that a compact configuration can be achieved. Further, in the present invention, when a human applies a pressing force to the piezoelectric element with a gripping force or the like, the piezoelectric element can be bent and rapidly displaced from a flat state to a concavely bent state, High power can be obtained. ADVANTAGE OF THE INVENTION According to this invention, a flashlight can be provided by implement | achieving a compact light-emitting device with few parts, and mounting | wearing a light-emitting device so that illumination is possible with respect to the exterior. Since the light-emitting device according to the present invention does not require a battery, there is no need for maintenance such as battery replacement or periodic battery replacement.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a sectional view showing a schematic structure and an operating state of a power generation unit 10 according to the present invention. As shown in FIG. 1A, the power generation unit 10 of the light emitting device includes a flexible piezoelectric element 11 formed by bonding a reinforcing plate 13 and a piezoelectric plate 12, and a bending of the piezoelectric element 11. A support member 15 that freely supports and an elastic body 14 are provided. The piezoelectric element 10 is a piezoelectric element that has flexibility and is bent convexly by receiving a compressive force in a longitudinal direction from a support member.

  The piezoelectric plate 12 is made of, for example, a lead zirconate titanate piezoelectric material, is polarized in the thickness direction thereof, and has a rectangular shape with the left-right direction in FIG. 1 as the longitudinal direction. Here, the piezoelectric element 11 has a so-called unimorph type structure, but is not limited to this, and has various flexibility such as a monomorph element, a bimorph element, and a multilayer bimorph element. A piezoelectric element can be used. The reinforcing plate 13 is made of metal, resin, or a composite thereof. The reinforcing plate 13 is preferably one that is small in deformation in the length direction and excellent in restoring force in the thickness direction, and is preferably made of a spring material such as tough steel and phosphor bronze. A V-shaped notch 16 is formed on the inner wall surface of the support member 15, and the piezoelectric element 11 is supported by being inserted into the notch 16 so that both ends thereof are movable.

  As the elastic body 14, various materials such as a so-called rubber such as an isoprene polymer, a plastic elastic body, and the like, such as a “spiral spring” that is a metal elastic body, are used. It is preferable to generate a strain approximately proportional to the external pressure and to generate a stress corresponding to the strain. It is a concept that includes a so-called buckling spring that does not deform when an external force that is smaller than a certain magnitude is applied, and that suddenly bends when an external force greater than a certain magnitude acts. In addition, if the piezoelectric element has a bending restoring function such that the shim plate has a shape memory function, if the external force is removed, it can be returned to an initial state where no external force is applied without using an elastic body. Furthermore, even a piezoelectric element that does not have a restoring function, the concave portion of the concave piezoelectric element can be returned to the initial state by applying an external force from the opposite side, that is, from the convex side. Further, even a piezoelectric element having a self-restoring force can relieve stress from an external force by using an elastic body, and a light-emitting device with a long lifetime can be configured.

  When the elastic body 14 is made of metal, it is preferable to sandwich the piezoelectric element 11 between a flexible plastic plate or laminate coating in order to insulate the piezoelectric element 11 from the elastic body 14. . Such a configuration in which the piezoelectric element 11 is sandwiched between plastic plates is preferable from the viewpoint of protecting the piezoelectric element 11 and from the viewpoint of adjusting the bending strength of the piezoelectric element 11.

  In a state where no external force is applied to the piezoelectric element 11, the piezoelectric element 11 has flexibility and is bent convexly. Moreover, it is preferable that the lower side is in contact with the elastic body 14. One reason for adopting such a configuration is, for example, that the elastic body is displaced without waste to sufficiently obtain the restoring force of the elastic body to be described later. Even in the case of a piezoelectric element having a self-restoring force, by using an elastic body in this way, stress from external force can be further alleviated and a long-life light emitting device can be configured.

  The structure in which the reinforcing plate 13 of the piezoelectric element 11 is brought into contact with the elastic body 14 is that when the piezoelectric plate 12 is brought into contact with the elastic body 14, a large stress is applied to the contact portion, and the piezoelectric plate 12 is destroyed. This is to prevent it. In order to easily support the piezoelectric element 11 in such a state, the piezoelectric element 11 is supported in a convexly bent state, and when the piezoelectric element becomes flat, a horizontal force causes excessive stress. The notch 16 may be formed so as not to hang on the piezoelectric element. Specifically, as shown in the figure, the support plate is cut into a V shape and bent in a convex manner, and the piezoelectric plate is received at the V-shaped side, and when flat, it is received at the deepest part of the V-shaped valley and recessed. It is also preferable that the piezoelectric plate bent to be supported by a V-shaped side surface on the opposite side. Furthermore, as will be described later, it is more preferable that a variable force corresponding to the bending of the piezoelectric element is applied in the longitudinal direction so that both ends in the longitudinal direction are supported by the support member.

  In the power generation unit 10 configured as described above, an external force (pressing force) is applied to the piezoelectric element 11 so as to shift from the state shown in FIG. When the pressure is applied gradually, the pressure changes to FIG. The external force F at this time is a critical magnitude that can invert the piezoelectric element 10. F is a force larger than the resultant force of the restoring force of the elastic body 14 and the restoring force of the piezoelectric element 11 as a leaf spring in FIG. When a force larger than F is applied for a predetermined time or longer, the piezoelectric element 11 is bent and deformed into a concave shape and the elastic body 14 is contracted and deformed almost instantaneously through the state shown in FIG. As a result, large electric energy is generated in the piezoelectric element 11 and can be taken out by an electric circuit.

  The state shown in FIG. 1C is a state where the piezoelectric element is not bent any more. In this state, the horizontal force from the support portion bends the piezoelectric element, and the resultant force of pressing the elastic body downward and the vertical component of the external force temporarily balances with the restoring force of the elastic body. It can be said that it is a temporary stable state. Next, when the external force applied to the piezoelectric element 11 becomes smaller than a certain magnitude in the state shown in (b), the restoring force from below the elastic body 14 exceeds the force by which the piezoelectric element pushes the elastic body, and the piezoelectric element 11 instantaneously returns to the original convex shape, and the piezoelectric element 11 also returns to the original shape shown in FIG. 1 (a) from FIG. 1 (c). As described above, even when the elastic body 14 returns to its original shape, the piezoelectric element 11 bends rapidly, thereby generating a large electric energy in the piezoelectric element 11 and taking it out by an electric circuit. This is because the restoring force as a leaf spring of the piezoelectric element and the restoring force from the elastic body work simultaneously.

  As a configuration for returning from the state shown in FIG. 1C to the state shown in FIG. 1A, buttons for applying an external force to the piezoelectric element 11 are attached to the upper side of the piezoelectric element 11, and the buttons are Although the structure is such that the piezoelectric element 11 can be warped in an upward convex shape because it is positioned so as to move within a certain range, the case where it cannot be warped to a stable position is also included. When the piezoelectric element 11 is free, the stable state shown in FIG. In FIG. 1, as an elastic body,

  Since the polarity of the voltage generated when the piezoelectric element 11 is bent changes depending on the bending direction of the piezoelectric element 11, electric energy can be extracted from the piezoelectric element 11 using a bridge rectifier circuit. preferable. Thereby, it is possible to prevent a voltage having a reverse polarity from being applied to a load, a storage battery, or the like.

  Next, a power generation unit of a light emitting device according to another embodiment of the present invention will be described. FIG. 2 is a cross-sectional view illustrating a schematic structure of the power generation unit 20. In the power generation unit 20, a constant compressive force is applied in the longitudinal direction of the plurality of piezoelectric elements 11, and the piezoelectric elements 11 are supported in a bent state so as to be convex upward, and are approximately in the middle of adjacent piezoelectric elements. A spacer 22 is provided in the part, and the lower surface of the lowermost piezoelectric element 11 is in contact with the elastic body 14. Further, a pressing member 21 is provided so as to be in contact with the convex portion of the uppermost piezoelectric element 11. The pressing member 21 and the spacer 22 are preferably made of metal, plastic, ceramics or the like. However, since the external force is transmitted, the entire member has high rigidity, and the contact portion between the piezoelectric element 11 and the spacer 22 is smooth and wear-resistant. It should be good and should not damage the surface of the piezoelectric element. Further, it is preferable that the piezoelectric plate 12 is not provided in the portion so that the pressing member 21 and the spacer 22 do not contact the piezoelectric plate 12 of the piezoelectric element 11. For example, it is also preferable to handle the piezoelectric plate by separating the piezoelectric plate or by hollowing out the contact portion between the piezoelectric plate and the pressing member 21 or the spacer 22.

  The bending form of each piezoelectric element 11 and the form of the elastic body 14 in the power generation unit 20 are the same as those of the power generation part 10, but when a greater force is applied to the piezoelectric element 11 than the pressing force F that flattens the piezoelectric element 11, By selecting an appropriate elastic body 14 having a constant value, it is possible to cause the piezoelectric element 11 to undergo steep bending deformation by utilizing the spring properties of the plurality of piezoelectric elements 11 themselves beyond the stress due to the deformation of the elastic body 14. Further, even when the pressing force applied to the piezoelectric element 11 is removed, the piezoelectric element is suddenly returned to the original posture by utilizing the spring property of the piezoelectric element 11 itself in addition to the force received from the elastic body 14. Is easy. That is, as shown in FIG. 2B, for example, when an external force is applied to the pressing member 21 to flatten the piezoelectric element 11, and further an external force is applied to the pressing member 21, a horizontal force applied to the piezoelectric element from the support portion. Thus, due to the action of the reinforcing plate of the piezoelectric element as a leaf spring, all the piezoelectric elements 11 bend instantaneously so as to be concave. When the external force is applied with a predetermined magnitude, the displacement proceeds until it antagonizes with the restoring force of the elastic body 14. On the other hand, when the external force applied to the pressing member 21 is removed or reduced in the state shown in FIG. 2C, the piezoelectric element 11 is instantaneously restored to the state shown in FIG. In response, the exercise returning to FIG. Thus, by repeatedly applying the external force at a constant cycle, the piezoelectric plate 11 generates power efficiently.

  Since the electrical energy obtained from the piezoelectric element 11 is AC power in this way, it is usually converted into DC power through a rectifier circuit (for example, a Wheatstone bridge rectifier circuit) and used in a power storage device such as a capacitor or a secondary battery. It can be charged or directly supplied to the load to drive the load. When the load is a light emitting diode, it can emit light. In the power generation section shown in FIG. 2, it is necessary to provide a rectifier circuit for each piezoelectric element 11 in order for the plurality of piezoelectric elements 11 to bend and move so as to be uniformly convex or concave as described above. There is no, but it does not exclude this. That is, as shown in FIG. 3, a rectifier circuit is attached to each piezoelectric element, and after rectification, a light emitting diode is emitted by connecting to a power storage unit such as a capacitor, a capacitor, or a secondary battery in parallel or directly. The LED can be connected to a light emitting diode to emit light.

  In the light emitting device including the power generation units 10 and 20 shown in FIGS. 1 and 2, when the light emitting diode is attached to the piezoelectric element 11 via the bridge rectifier circuit, the piezoelectric element 11 becomes flat (b). From (1) to (c), and when the elastic body 14 returns to the original posture and (a) is obtained, it was confirmed that the light emitting diode shines best.

  Further, as shown in FIG. 4, each bimorph piezoelectric element and the light emitting diode can be directly connected without a rectifier circuit. In FIG. 4, the light emitting diode 100a has a cathode connected to the electrode 12b of the piezoelectric plate and an anode connected to the electrode 12a of the piezoelectric plate. On the other hand, the light emitting diode 100b has a cathode connected to the electrode 12a of the piezoelectric plate and an anode connected to the electrode 12b of the piezoelectric plate. For example, in FIG. 4, when the polarization direction of the bimorph piezoelectric ceramic is parallel and upward, the electrode 12a surface of the piezoelectric plate is the positive electrode. When the electromotive force is positive, 100a is lit and 100b is not lit. In FIG. 4, when the electromotive force is negative, 100b is lit and 100a is not lit. From FIG. 1 (a) to FIG. 1 (b) and from FIG. 1 (b) to FIG. 1 (c), different light emitting diodes emit light, respectively. Conversely, from FIG. 1C to FIG. 1B and from FIG. 1B to FIG. 1A, the light emitting diode emits light in a manner opposite to that described above. become. Furthermore, the light emitting diodes 100a and 100b having two types of connection modes opposite to each other emit visible light having a luminance proportional to the magnitude of the electromotive force reflecting the strain rate according to the external force. As a result, both light-emitting diodes repeatedly blink rhythmically with external force, and if one of the light-emitting diodes is lit when the oscillation period is short, the overall brightness is always on due to the remaining luminance, and the lighting effect Can also be realized. FIG. 4 shows an example of a bimorph type piezoelectric element, but a monomorph type piezoelectric element can be constituted by a light emitting diode 100a and a light emitting diode 100b simply connected in opposite directions to both electrodes.

  Further, in the light emitting device 20, by bending the plurality of piezoelectric elements 11, the same power generation efficiency can be obtained with respect to a large external force such as a gripping force that cannot be handled by a single piezoelectric element. Moreover, if electric power is taken out from each piezoelectric element in parallel, a large current proportional to the number of piezoelectric elements can be obtained. Moreover, if electric power is taken out from each piezoelectric element in series, a large voltage proportional to the number of piezoelectric elements can be obtained.

  When the external force applied to the piezoelectric element of the power generation unit described above is used as a hand grip force, a flashlight as shown in FIG. 5 can be provided. As an embodiment of the flashlight, the piezoelectric element itself can be directly held by the finger part or the palm part of the hand to generate electric power. In addition, the external force application side of the support portion is covered with a covering material such as flexible plastic or rubber, and the covering material portion is grasped by a finger portion or a palm portion of the hand, and external force is applied to the piezoelectric element through this. In addition, it is preferable to generate electricity. Moreover, it is also preferable to generate electric power by holding the pressing member 21 in FIG. 2 with a finger part or a palm part of the hand.

  FIG. 6 illustrates the present invention in which the rectifier circuit and the power storage device are electric circuits and the light emitting diode is a light emitting portion. As shown in FIG. 6, the rectifier circuit can be of a type in which each piezoelectric element is connected in parallel and connected to one rectifier circuit, or a type in which one rectifier circuit is added to each piezoelectric element as shown in FIG. .

  Furthermore, as shown in FIG. 7, by processing the power after passing through the rectifier circuit in combination with a power storage unit such as a capacitor, a diode, and an electrical resistance, even if the power storage device is in an almost empty state, Thus, it is possible to avoid a state in which the total amount of is absorbed by the power storage device and cannot be lit. When you want to use a flashlight, it is time to illuminate immediately, and it is desirable to illuminate the LED immediately, and if external force is applied continuously, it is desirable to gradually store power with extra power. Therefore, in order to realize this, it is desirable to have an electric circuit configuration as shown in FIG.

  FIG. 8 is a cross-sectional view showing a schematic structure of a power generation unit 30 which is still another embodiment of the present invention. In the power generation unit 30, one end of the piezoelectric element 11 is supported by the movable support member 31 and the other end is supported by the fixed support member 15. Further, the lower surface of the piezoelectric element 11 is in contact with the elastic body 14. As a method for fixing the piezoelectric element 11, as shown in FIG. 9, a cylindrical member 34 is fixed to one end of the piezoelectric element 11, and a cylindrical hole 33 is provided in the support member 32. It is also preferable to have a structure in which the cylindrical member 34 is fitted in the hole 33 so as to be rotatable. However, the notch 16 in the power generation part of FIGS. 1 and 2 is supported by the inner surface of the V-shaped valley when bent, and is supported by the inner surface of the V-shaped valley when bent. Although it is possible to support the piezoelectric plate support interval to some extent by supporting it at the back, in the support method shown in FIG. 9, the support portion is rotatably supported. In such a fixed support member, the support interval is kept constant. Therefore, a mechanism is provided in which the movable support member 31 is provided to change the support interval. In particular, in the state of FIG. 8B, the movable support member 31 moves to the left and the support interval is widened, so that stress on the entire piezoelectric element can be reduced. Furthermore, there is an advantage that electric power can be taken out with a small external force by a support method using a movable support member shown in FIGS. 10A and 10B described later.

  Therefore, one end of the piezoelectric element is supported by a movable support portion, and a horizontal force is variably applied according to the bending of the piezoelectric element. By supporting the piezoelectric element, stress in the horizontal direction of the entire piezoelectric element is reduced. Thus, it is possible to increase the life and change from the (b) state to the (c) state with an appropriate horizontal force. As a result, the piezoelectric element can be smoothly changed, and a high electromotive force is exhibited without stress. Such a method of supporting the piezoelectric element 11 shown in FIG. 9 can be applied to the power generation units 10 and 20 having the notch portions in the support portion described above. Further, as an embodiment in which one end or both ends of the piezoelectric element are supported by the movable support portion, FIG. 10B is also preferable. In FIG. 10 (a), the movable support portion slides in the horizontal direction to change the support interval, whereas in FIG. 10 (b), the support portion has a rotating shaft, It becomes movable by widening the support interval while rotating along the provided guide. In the state in which the piezoelectric element is bent, in FIGS. 10A and 10B, the rotary movable support portion is restored to the original position by the restoring elastic body attached to the guide.

  In the power generation unit 30, the light emitting diode is attached to the piezoelectric element 11 via the bridge rectifier circuit according to FIG. 3, and when the present invention is used, the piezoelectric element 11 is flattened from the state of FIG. 3B to FIG. It was confirmed that the light-emitting diode shines best when the elastic body 14 returns to the original state until it reaches the state and from the state of FIG. 3C to FIG. 3A.

  The power generation units 40 and 50 shown in FIG. 11 are cross-sectional views showing still another embodiment of the present invention. In both cases, the flexible convexly bent piezoelectric element 11, the elastic body 14, the support part 15 that flexibly supports the piezoelectric element, and the bimorph power generation element 11 having the separated piezoelectric part are arranged so as to face each other vertically. The striking objects 41 and 51 for applying an external force are arranged between the piezoelectric elements 11. The striking objects 41 and 51 are devised to efficiently apply external force to the convex portions of the piezoelectric element when the entire housing including the support member 15 is vibrated by a human hand. Since the hit objects 41 and 51 do not come into contact with the piezoelectric plate 12, damage due to the hitting of the piezoelectric plate does not occur. That is, in FIG. 6A, the hitting object 41 is pinned to one end of a rod-like object 42 so as to be movable up and down, and the other end of the rod-like object is pinned to an intermediate part of the support part so as to be rotatable. . In FIG. 6B, the striking object 51 moves up and down while the left and right movement is restricted by the guide 52 having a width slightly wider than the width.

  The striking objects 41 and 51 may be metal balls such as steel balls, plastic balls, ceramic balls, or columnar or cubic shapes made of the same material. When a striking object such as a steel ball hits the convex part of the other piezoelectric element and an external force is applied, the elastic body is pushed by the piezoelectric element and contracts, and when the striking object suddenly changes into a concavely bent piezoelectric element, Apart from the piezoelectric element, the elastic body returns to its original shape, and when the piezoelectric element having the concave portion suddenly returns to the piezoelectric element having the convex portion, a large electric power is developed. This is because the electromotive force is substantially proportional to the displacement speed of the piezoelectric plate of the piezoelectric element. The maximum electromotive force generated by the power generation unit is obtained under the condition that the integral value of the displacement speed of the piezoelectric element per unit time is maximized. This depends on the size and weight of the hit object, the number of hits, the elastic constant of the elastic body, and the characteristics of the piezoelectric element itself as a leaf spring.

  The power generation units 60 and 70 are cross-sectional views showing still another embodiment of the present invention. In both cases, the bimorph power generation element 11 having the flexible piezoelectric element 11, the elastic body 14, and the support portion 15 is disposed so as to be opposed to each other vertically, and agents 61 and 71 for applying an external force are placed between the piezoelectric elements 11. Structure. The acting material applies the lever principle so that an external force can be efficiently applied to the convex portion of the piezoelectric element. That is, in FIG. 6 (a), the action object 61 is pinned to one end of the collar so as to be movable up and down, and the other end of the collar is extended outside the housing including the support portion 15, It is pinned with a pin 63 so as to be rotatable at an intermediate part 15 ′ of the support part. In FIG. 6 (b), one end of the collar 72 is pinned to the intermediate part 15 ′ of the support part 15, and the other end of the collar 72 is the support part facing the support part intermediate part 15 ′ having the pinning part 73. It penetrates between and is placed outside the housing. An action material 71 is fixed in the vicinity of the convex portion of the piezoelectric element of the flange 72. Both the agents 61 and 71 apply an external force to the convex portion of the piezoelectric element 11 on the basis of the lever principle. This external force can also be applied by a gripping force or vibration motion by a human hand.

  The acting objects 61 and 71 may be metal balls such as steel balls, plastic balls, ceramic balls, or cylindrical or cubic objects made of the same material. When an action object such as a steel ball hits the convex part of one piezoelectric element and an external force is applied, the elastic body is pressed and contracted by the piezoelectric element, and suddenly changes to a concavely bent piezoelectric element. When the object is separated from the piezoelectric element, the elastic body returns to its original shape, and the piezoelectric element bent into a concave shape suddenly returns to a piezoelectric element having a convex portion, a large electric power is developed. This is because the electromotive force is substantially proportional to the displacement speed of the piezoelectric plate of the piezoelectric element. The maximum electromotive force generated by the power generation unit is obtained under the condition that the integral value of the displacement speed of the piezoelectric element per unit time is maximized. This depends on the size and weight of the steel ball, the number of hits, the elastic constant of the elastic body, and the characteristics of the piezoelectric element itself as a leaf spring.

  In this way, the light emitting device of the present invention is configured by including any of the power generation units 40, 50, 60, and 70 to which an external force is applied, the electric circuit of FIG. 3, FIG. 4, FIG. 6, and FIG. can do. This external force can also be applied by a gripping force or vibration motion by a human hand, and can be a flashlight.

  The present invention is suitable for a portable electroluminescent device. It is particularly suitable for a flashlight, and is not limited to such an application, but is suitable for an on-site light emitting device in a place where vibration is generated by natural force or human equipment.

FIG. 3 is a cross-sectional view illustrating a schematic structure and an operation state of the power generation unit 10. Sectional drawing showing the schematic structure of another electric power generation part 20, and an operation state. Conceptual diagram showing the configuration of the electric circuit 90 The conceptual diagram which shows the connection of another electric circuit 91 and the piezoelectric element 11 Conceptual diagram of applying external force to the piezoelectric element 11 by gripping the hand Configuration example of piezoelectric element 11, light emitting diode, and electric circuit Another configuration example of the piezoelectric element 11, the light emitting diode, and the electric circuit Furthermore, sectional drawing showing the general | schematic structure of another electric power generation part 30, and an operation state. Sectional drawing which shows another support form of a piezoelectric element. Sectional drawing showing the structure which supports a rectangular-shaped piezoelectric element with a variable support force in a longitudinal direction Sectional drawing showing schematic structure of the electric power generation parts 40 and 50 of another light-emitting device Sectional drawing showing the schematic structure of the electric power generation parts 60 and 70 of another light-emitting device.

Explanation of symbols

10, 20, 30, 30 ′, 30 ″, 40, 50, 60, 70; power generation unit 11; piezoelectric element 12; piezoelectric plate 12a, 12b; piezoelectric plate electrode 13; reinforcing plate 14; '; Fixed support member 16; Notch portion 21; Pressing member 22; Spacer 31; Movable support member 32; Support member 33; Cylindrical hole portion 34; Cylindrical member 41 and 51; 61 · 71; active substance 62 · 72; ６３ 63 · 73; pin 90; electric circuit 91; rectifier circuit 100a, 100b;

Claims (7)

A flexible piezoelectric element formed by bonding a reinforcing plate and a piezoelectric plate, a support member that supports the piezoelectric element in a freely bendable manner, an elastic body, an electric circuit, and a light emitting diode;
Said piezoelectric element, by the horizontal compressive force applied from the support member in its outside to the reinforcing plate, the whole is bent in a convex in a vertical direction, the elastic member by applying an external force to the convex portion When the piezoelectric element is pressed and contracted to bend into a bent piezoelectric element, and the external force applied to the piezoelectric element is removed, the elastic body returns to its original shape and A light emitting device characterized in that, when a bent piezoelectric element is restored to a convex bent piezoelectric element, the light emitting diode is caused to emit light through the electric circuit that generates electric power and transmits electric energy. Wherein in a state where the external force to the piezoelectric element does not act, the piezoelectric element emitting device according to claim 1, characterized in that in contact with the elastic body.   The light emitting device according to claim 1, wherein the piezoelectric element has a rectangular shape, and both ends of the piezoelectric element are supported by the support member. The piezoelectric element has a rectangular shape, said horizontal compressive force is applied to the variable in the longitudinal direction, claim 1, both ends of the longitudinal direction, characterized in that it is supported by the support member Or the light-emitting device of Claim 2.   The light emitting device according to claim 1, wherein the electric circuit includes a power storage unit.   5. The light-emitting device according to claim 1, wherein the external force is a grip force of a human or a force caused by vibration motion of a human hand.   A flashlight using the light-emitting device according to claim 5.

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