JP2008072862A - Power generation device, and power generation apparatus with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide portable equipment with a power generation apparatus which generates power with higher efficiency. <P>SOLUTION: A power generation device includes a power generating means to induce electricity, a rectifying means to rectify the electricity induced by the power generating means, and an accumulating means of the electricity rectified by the rectifying means. The power generating means includes a bias magnet which is magnetized in two poles, a magnetostriction material, a compressing means, a closed magnetic path forming member, and a coil. The magnetostriction material changes magnetic permeability through a reverse magnetostrictive effect by applying force from an outside, and changes a flow of magnetic flux which is generated at one pole of the bias magnet. The compressing means is arranged between the bias magnet and the magnetostriction material, and applies periodic amplitude force to the magnetostriction material. The closed magnetic path forming member is arranged so that the magnetic flux flowing out of the magnetostriction material may be introduced to the other pole of the bias magnet. The coil is wound around the magnetostriction material or the closed magnetic path forming member. Such constitution is employed to supply the electricity induced by the power generating means to the rectifying means through a coil terminal of the coil. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a power generation device using an inverse magnetostriction effect that converts mechanical energy generated by applied force into electric energy, and a power generation apparatus including the power generation device.

  As a conventional power generation device that uses the inverse magnetostrictive effect, the amount of magnetic flux that passes through the magnetostrictive material out of the magnetic flux generated from the bias magnet placed at the end of the magnetostrictive material by applying force to the magnetostrictive material by the movement of the rotating weight A power generator that can generate a large amount of current at a low voltage of several [V] is known by using the current induced in the coil wound around the magnetostrictive material by changing the amount of magnetic flux. (For example, refer to Patent Document 1).

  FIG. 15 and FIG. 16 are drawings for explaining a configuration example of this conventional power generation apparatus and a configuration of coil means constituting a part of a power generation device included in this power generation apparatus.

  As shown in FIG. 15, the conventional power generation apparatus 301 includes a low voltage drive device 6 and a power generation device 302, and is configured to drive the current generated by the power generation device 302 with the low voltage drive device 6. Yes.

  As shown in FIGS. 15 and 16, the conventional power generation device 302 includes coil means arranged so that magnetic fluxes generated by the two bias magnets 8 pass through the movement of the rotary weight 20 that moves due to the difference in posture. The magnetostrictive material 7 at the core 310 is configured to apply a force.

  In the power generation device 302 configured in this manner, the amount of magnetic flux passing through the magnetostrictive material 7 changes due to the inverse magnetostrictive effect, and a current is induced in the coil 17 wound around the magnetostrictive material 7. The induced current is rectified by the rectifying means 4 via the rectifying means terminals 13 and 14, and the rectified electric charge is stored in the power storage means 5. The electric charge stored by the power storage means 5 is used for driving a low voltage driving device 6 such as a wristwatch.

Japanese Patent Laid-Open No. 9-90065 (page 2-3, FIG. 1-2)

  However, in the conventional power generation device 302, when the magnetic flux generated at one pole of the two bias magnets 8 returns to the other pole, a closed magnetic circuit is not formed, and therefore the degree of demagnetization of the bias magnet 8 is large. Become. Therefore, there is a problem that the amount of magnetic flux that contributes to power generation through the magnetostrictive material 7 is greatly reduced. Therefore, since this conventional power generation apparatus 301 generates current using the power generation device 302 having the above-described problems, it is difficult to efficiently generate power.

  Therefore, an object of the present invention is to solve the above-described problems, and an object thereof is to provide a power generation device that can generate power with higher efficiency and a power generation apparatus including the power generation device.

The power generation device of the present invention basically employs the configuration described below.
The power generation device of the present invention includes a power generation means for inducing current, a rectification means for rectifying the current induced by the power generation means, and a power storage means for storing charges obtained by rectification by the rectification means. Magnetostriction in which the power generation means changes the magnetic flux generated at one pole of the bias magnet by changing the permeability by the reverse magnetostriction effect by applying a force from the outside with a bias magnet magnetized to two poles A compression means for applying a periodic amplitude force to the magnetostrictive material and a magnetic flux flowing out of the magnetostrictive material to guide the other magnetic pole to the other pole of the bias magnet. A path forming member and a coil wound around the magnetostrictive material or the closed magnetic path forming member, and configured to supply current induced by the power generation means to the rectification means via the coil terminal of the coil. Become And it is characterized in and.

  In the power generation device of the present invention, the compression means mentioned above is in contact with the operating lever, the feed screw rotating by the force applied to the operating lever, and the magnetostrictive material, and the shaft of the feed screw by the force expanded by the rotation of the feed screw. Compressive member made of soft magnetic material, which is fed in the direction, and the operating lever, are integrated with the operating lever. By rotating the feed screw in the reverse direction, the force and displacement applied to the compressing member are removed, and the operating lever is again forced And a return spring for applying displacement.

  The power generation device of the present invention is characterized in that the power storage means in the power generation device described above and a low voltage drive device are connected, and the low voltage drive device is driven using the charge stored in the power storage means. To do.

  Unlike the conventional configuration, the present invention employs a configuration in which the flow of magnetic flux generated from the bias magnet forms one closed magnetic circuit, so that the magnetostrictive material does not increase the degree of demagnetization of the bias magnet. The amount of change in magnetic flux that contributes to power generation can be increased. Therefore, if the configuration of the present invention is used, power generation can be performed with high efficiency.

  In the configuration of the present invention, since the coil core is formed of a soft magnetic material, the degree of demagnetization of the bias magnet can be further suppressed, and power generation can be performed with high efficiency.

  In addition, since the structure of the present invention has a structure in which a minute gap is provided between the bias magnet and the magnetostrictive material when a force is applied to the magnetostrictive material by the compression means, the magnetic flux that contributes to power generation through the magnetostrictive material. The amount of change in power can be increased, and power generation can be performed with higher efficiency.

  In the configuration of the present invention, since the compression means and the bias magnet are not fixed, but only the magnetostrictive material is fixed, only the compressive force acts on the magnetostrictive material, and no force acts on the bias magnet. The durability of the device can be greatly increased.

  In addition, since the structure of the present invention uses a mechanism capable of expanding the force as the compression means, generally, the level of force required to cause the inverse magnetostriction effect is applied with a small force. It becomes possible.

  The power generation device of the present invention includes a power generation device having a power generation means, a rectifier circuit, and a power storage means, and a low-voltage driving device connected to the power storage means, as in the conventional configuration.

  The configuration of the rectifier circuit, the power storage means, and the low-voltage drive device included in this power generation device is the same as the conventional configuration, but the power generation device of the present invention has the configuration of the power generation means included in the power generation device. Is different. This power generation means is configured to form a closed magnetic path for the magnetic flux generated from one pole of the bias magnet and return to the other pole.

With this configuration, it is possible to increase the amount of change in magnetic flux that passes through the magnetostrictive material and contributes to power generation without increasing the degree of demagnetization of the bias magnet that could not be obtained with conventional power generation devices. . Below, the structure of the electric power generation device of this invention and the specific structure of an electric power generating apparatus provided with the same are demonstrated based on drawing.

  First, the power generation device of this embodiment and a power generation apparatus including the power generation device will be described. FIG. 1 is a diagram for explaining a configuration example of a power generation apparatus and a power generation device of the present invention, and FIG. 2 is a perspective view showing a configuration of a power generation means.

  As shown in FIG. 1, a power generation device 1 according to the present invention includes a power generation means 3 that induces a current having a periodic amplitude synchronized with the periodic amplitude force by applying a periodic amplitude force, and a power generation means. Power generation device 2 having a rectifying means 4 for rectifying the current induced in 3, a power storage means 5 for storing the charge rectified by the rectifying means 4, and a low power driven by using the charge stored in the power storage means 5. And a voltage driving device 6.

  As shown in FIGS. 1 and 2, the power generation means 3 has a bias magnet 8 magnetized in two poles and a magnetic flux generated from one pole of the bias magnet 8 in a direction having magnetic anisotropy. It is arranged so as to pass through, and is arranged between the bias magnet 8 and the magnetostrictive material 7a by changing the magnetic permeability due to the inverse magnetostriction effect by applying an external force and changing the flow of magnetic flux, Compression means 9 for applying a periodic amplitude force in the direction of magnetic anisotropy of the magnetostrictive material 7a. Further, the power generation means 3 applies a periodic amplitude force to the magnetostrictive material 7a by the compression means 9 so that the flow of magnetic flux passing through the magnetostrictive material 7a is wound around the coil core and the coil core. The coil means 10 is arranged so as to be linked with the coil and induces a current by the periodically changing magnetic flux. Further, the above-described members are arranged so that the flow of magnetic flux forms one closed magnetic path so that the magnetic flux interlinked with the coil in the coil means 10 returns to the other pole of the bias magnet 8 again.

  The closed magnetic path is formed by providing a soft magnetic member 12 that magnetically connects the magnetic material 7a and the coil means 10 and a soft magnetic member 11 that magnetically connects the coil means 10 and the bias magnet 8. Is done. Further, the two soft magnetic members 11 and 12 are fixed by sandwiching the nonmagnetic members 15 and 16.

Next, the coil means described above will be described in more detail. FIG. 3 is a diagram for explaining a configuration example of the coil means 10 in the power generation means 3.
The coil means 10 is provided with a coil core 18 made of a soft magnetic material, a coil 17 made of an electrical wire wound around the coil core 18, and both ends of the coil 17. And rectifying means terminals 13 and 14 transmitted to. In the case of the present embodiment, the coil core 18 serves as a closed magnetic path forming member.

  Next, the operation of the power generation means 3 of the present invention will be described. 4-6 is drawing for demonstrating the effect | action of the electric power generation means 3 in a present Example. FIG. 4 shows an initial state of the power generation means 3, and FIG. 5 shows that the compression means 9 is moved to the magnetostrictive material 7 a side to form a space between the compression member 9 and the bias magnet 8 and magnetostriction. 6 shows a state when the flow of magnetic flux of the material 7a is reduced, and FIG. 6 shows a state when the state shown in FIG. 5 is canceled and a closed magnetic circuit is formed again.

  As shown in FIG. 4, the flow of magnetic flux in the initial state of the power generation means 3 is that the magnetic flux generated from the N pole of the bias magnet 8 is the compression means 9, the magnetostrictive material 7 a, the soft magnetic member 12, and the coil means 10. The soft magnetic member 11 and the bias magnet 8 are formed back to the south pole. That is, in this state, the flow of magnetic flux forms one closed magnetic circuit.

  Further, as shown in FIG. 5, the compressing means 9 applies a force in the direction having the magnetic anisotropy of the magnetostrictive material 7a, that is, in the direction parallel to the direction in which the magnetic flux flows (direction indicated by the arrow). The amount of magnetic flux passing through the magnetostrictive material 7a changes due to the inverse magnetostrictive effect, and at the same time, the amount of magnetic flux interlinked with the coil of the coil means 10 forming the closed magnetic path is changed to induce a current in the coil. In this case, by applying a compressive force to the magnetostrictive material 7 a by the compression means 9, the magnetic permeability of the magnetostrictive material 7 a is lowered due to the inverse magnetostrictive effect, thereby reducing the amount of magnetic flux passing through the coil means 10. Accordingly, the amount of magnetic flux interlinking with the coil in the coil means 10 is also reduced, so that a current corresponding to the degree of change is induced.

  Further, as shown in FIG. 6, the force applied to the magnetostrictive material 7a is released by the compression means 9 in the direction indicated by the arrow, so that the amount of magnetic flux passing through the magnetostrictive material 7a is again in the initial state (the state shown in FIG. 4). ) At the same time, the amount of magnetic flux interlinking with the coil in the coil means 10 forming the closed magnetic path also returns to the original, and this time, a current in the reverse direction can be induced in the coil.

  In this way, the induced current direction is different between the states shown in FIGS. 5 and 6, but as shown in FIG. 1, the induced current is passed to the rectifying means 4 through the rectifying means terminals 13 and 14. By being transmitted, the current is rectified and stored in the storage means 5. And the low voltage drive device 6 can be driven using the electric charge stored in the power storage means 5.

  Therefore, by periodically repeating the operations shown in FIGS. 4 to 6 described above, the mechanical energy of the periodic force can be stored in the power storage means 5 as electrical energy.

  Further, in the power generation means 3 of this configuration, since the flow of magnetic flux generated by the bias magnet 8 forms one closed magnetic circuit, the degree of demagnetization of the bias magnet 8 is not increased and the pressing means 9 is used. Thus, the amount of change in magnetic flux that contributes to power generation can be increased through the magnetostrictive material 7a. Therefore, according to this configuration, power generation can be performed with high efficiency.

  Further, since the coil core 18 (see FIG. 3) corresponding to the closed magnetic path forming member in the power generation device 3 is made of a soft magnetic material, the degree of demagnetization of the bias magnet 8 can be suppressed as much as possible.

  Further, when a force is applied to the magnetostrictive material 7a by the compression means 9 in the power generation device 3, a minute gap is provided between the bias magnet 8 and the magnetostrictive material 7a, so that it contributes to power generation through the magnetostrictive material 7a. The amount of change in magnetic flux can be further increased.

  Further, by fixing only the magnetostrictive material 7a without fixing the compression means 9 and the bias magnet 8, only the compressive force acts on the magnetostrictive material 7a, and no force acts on the bias magnet 8. In general, ferromagnetic materials such as magnetostrictive materials and magnets are very fragile against tensile forces, but have a high yield strength against compressive forces, so this configuration greatly increases the durability of power generation devices. Can be increased.

  Next, a modification of the power generation means according to the present invention will be described. FIG. 7 is a diagram for explaining a configuration example of the power generation means in the present embodiment.

The power generation means 203 of the present embodiment uses a material whose permeability is lowered by applying a tensile force to the magnetostrictive material 7b by the tensile means 209 instead of the magnetostrictive material having the inverse magnetostrictive effect in the above-described form. The only difference is that the other configurations are the same.
Even with this configuration, the magnetic flux generated from one pole of the bias magnet 8 can form a closed magnetic path that returns to the other pole via a plurality of members. An effect can be obtained.

  Next, another configuration example of the power generation means of the present invention will be described. FIG. 8 is a drawing for explaining another configuration example of the power generation means in the present embodiment.

  The difference between the power generation means 103 shown in the present embodiment and the power generation means shown in Example 1 is that, as shown in FIG. 8, the arrangement of the coil means shown in the previous Example 1 is changed and the coil means 110 is changed. Is constructed by winding a coil around a magnetostrictive material (not shown), and a magnetic material 108 is newly provided at a position where the coil means in the power generation means of Example 1 is arranged. The same. In the case of this configuration, the magnetic material 108 serves as a closed magnetic path forming member. This embodiment can be applied when the power generation means 103 is not required to be downsized. That is, in order to obtain a desired amount of induced current, a predetermined number of coil turns is required, but in the configuration shown in FIG. 7, the coil means 110 is configured by winding a coil around a magnetostrictive material. This is because the configuration is not suitable when the number of windings is restricted.

  In this way, the coil means 110 is configured by winding a coil around a magnetostrictive material, and the magnetic material 108 is newly provided at the position where the coil means in the power generation means of the first embodiment is disposed. As in the first embodiment, the magnetic flux generated at one pole of the bias magnet 8 forms a closed magnetic circuit and flows to the other pole of the bias magnet 8. Therefore, similarly to the first embodiment, the amount of change in magnetic flux that contributes to power generation through the magnetostrictive material can be increased without increasing the degree of demagnetization of the bias magnet 8 that could not be obtained with the conventional power generation apparatus.

  In addition, although the form which wound the coil around the coil core was shown in Example 1 and the form which wound the coil around the magnetostrictive material in this embodiment, these forms are combined to connect the coil core and the magnetostrictive material in series. The coil may be wound around sequentially.

  Next, still another configuration example of the power generation means of the present invention will be described. FIG. 9 is a perspective view showing still another configuration example of the power generation unit of the present embodiment. The feature of this embodiment is that the compression means 9 shown in Embodiments 1 and 2 is configured by a compression member 21, an operation lever 22, a feed screw 23, and a return spring 24. Since the other structure which comprises the electric power generation means 303 is the same, description in a present Example is performed about this compression means 9, and the detailed description here about another structure is omitted.

  As shown in FIG. 9, the compression means 9 in the power generation means 303 is provided to be in contact with the operating lever 22, the feed screw 23 rotated by the force applied to the operating lever 22, and the magnetostrictive material 7 a. The compression member 21 made of a soft magnetic material, which is arranged so as to move in the axial direction of the feed screw 23 with the force expanded by the rotation of the rotation, is provided integrally with the operating lever 22 and rotates the feed screw 23 in the reverse direction. Thus, it is constituted by a return spring 24 for removing the force and displacement applied to the compression member 21 and applying the force and displacement to the operating lever 22 again.

  By configuring the power generation means 303 in this way, it is possible to easily store mechanical energy of periodic force as electrical energy. Further, since the compression means 9 in the present embodiment uses a mechanism capable of expanding the force from the outside, generally the level of force required to cause the inverse magnetostriction effect is small. It is possible to act by external force.

  Next, the operation of the compression means 9 in the power generation means 303 will be described. 10 to 12 are diagrams for explaining the operation of the compression means 9 in the power generation means 303. In this figure, (a) shows a top view of the power generation means 303, and (b) shows a right side view with the soft magnetic member 11 removed.

  As shown in FIG. 10, in the power generation means 303 in the initial state, the magnetic flux generated from the N pole of the bias magnet 8 is guided to the compression member 21 made of a soft magnetic material and the magnetostrictive material 7a. The magnetic flux guided to the magnetostrictive material 7 a passes through the coil means 10 through the soft magnetic member 12 and returns to the S pole of the bias magnet 8 through the soft magnetic member 11. . In other words, as described above, in the power generation means 303, the flow of magnetic flux forms one closed magnetic circuit. The compression member 21 has a female thread and can be fed by a feed screw 23. Further, an operating lever 22 configured integrally with the return spring 24 is fixed to the feed screw 23.

  Next, as shown in FIG. 11, the feed screw 23 fixed to the operating lever 22 by applying an external force to the operating lever 22 in the direction of the arrow shown in FIG. Now turn right. As the feed screw 23 rotates, the compression member 21 with the female screw cut is fed in the axial direction of the feed screw, leftward as shown in FIG. 5A, and compressive force is applied to the magnetostrictive material 7a. . At this time, a force obtained by expanding the force applied to the operating lever 22 is applied as a compression force.

  In this way, by applying a force to the compression member 21 in the direction having the magnetic anisotropy of the magnetostrictive material 7a, in the drawing, in the direction parallel to the flow direction of the magnetic flux, the amount of magnetic flux passing through the magnetostrictive material 7a by the inverse magnetostrictive effect. At the same time, the amount of magnetic flux interlinking with the coil 17 in the coil means 10 forming the closed magnetic path also changes, and current is induced in the coil 17. In this case, by applying a compressive force from the outside via the operation lever 22, the magnetic permeability of the magnetostrictive material 7a is lowered due to the inverse magnetostrictive effect, and the amount of magnetic flux passing through the magnetostrictive material 7a can be reduced. Along with this, the amount of magnetic flux interlinking with the coil 17 in the coil means 10 can also be reduced, so that a current corresponding to the degree of change can be induced from the coil 17.

  Next, as shown in FIG. 12, the force applied to the operating lever 22 is returned in the direction of the arrow shown in FIG. In this way, by releasing the force applied to the operating lever 22, the feed screw 23 fixed to the operating lever 22 rotates counterclockwise in FIG. With the rotation of the feed screw 23, the compression member 21 with the female screw cut is fed in the axial direction of the feed screw, that is, in the right direction opposite to FIG. 11 in FIG. Release the compressive force. Then, by releasing the force applied to the magnetostrictive material 7a, the amount of magnetic flux passing through the magnetostrictive material 7a returns to the initial state (the state shown in FIG. 10), and at the same time, in the coil means 10 forming the closed magnetic circuit. The amount of magnetic flux interlinking with the coil 17 is also restored, and a current in the opposite direction can be induced this time.

  In this way, by periodically repeating the operations of FIGS. 10 to 12, the power generation means 303 shown in the present embodiment can generate mechanical energy of periodic force as electrical energy. .

  Next, a configuration example of a power generation apparatus in which the power generation means including the compression means according to the present embodiment is incorporated in a wristwatch will be described. 13 and 14 are diagrams showing the configuration of the power generation device.

  As described in the first embodiment, the power generation device 3 includes a power generation device including a power generation unit, a rectification unit, and a power storage unit, and a low-voltage drive device. In FIGS. Only the arrangement form of the low-voltage driving device exterior 19 which is the exterior component of the power generation means 303 and the power generation means 303 is shown.

The power generation device 303 shown in FIG. 13 and FIG. 14 is configured by incorporating the operating lever 22 of the power generation means 303 through a notch provided in a low-voltage drive device exterior 19 such as a wristwatch. The configuration shown in FIGS. 13 and 14 is the same except that the position of the notch provided in the low-voltage drive device exterior 19 is changed. With this configuration, it becomes easy to operate the operation lever 22 with the other hand not wearing the wristwatch.

It is drawing which shows the structure of the electric power generating apparatus of this invention, and an electric power generation device. Example 1 It is a perspective view which shows the structural example of the electric power generation means which concerns on this invention. Example 1 It is drawing which shows the structural example of the coil means in the electric power generation means which concerns on this invention. Example 1 It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. Example 1 It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. Example 1 It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. Example 1 It is drawing which shows the modification of the electric power generation means which concerns on this invention. Example 1 It is drawing which shows the other structural example of the electric power generation means which concerns on this invention. (Example 2) It is a perspective view which shows the further another structural example of the electric power generation means which concerns on this invention. (Example 3) It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. (Example 3) It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. (Example 3) It is drawing for demonstrating the effect | action of the electric power generation means shown in FIG. (Example 3) It is drawing which shows the structural example of the electric power generating apparatus of this invention. (Example 3) It is drawing which shows the structural example of the electric power generating apparatus of this invention. (Example 3) It is drawing which shows the structure of the conventional electric power generating apparatus and an electric power generation device. It is drawing which shows the structure of the coil means in the conventional electric power generation device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power generation device 2 Power generation device 3 Power generation means 4 Rectification means 5 Power storage means 6 Low voltage drive equipment 7a, 7b Magnetostrictive material 8 Bias magnet 9 Compression means 10 Coil means 11 Soft magnetic member 12 Soft magnetic member 13 Rectification means terminal 14 Rectification means terminal DESCRIPTION OF SYMBOLS 15 Nonmagnetic member 16 Nonmagnetic member 17 Coil 18 Coil core 19 Low voltage drive apparatus exterior 21 Compression member 22 Actuation lever 23 Feed screw 24 Return spring 103 Power generation means 108 Magnetic material 110 Coil means 203 Power generation means 209 Tension means 301 Power generation apparatus 302 Power generation device 303 Power generation means 310 Coil means

Claims (3)

Power generation means for inducing current,
Rectifying means for rectifying the current induced by the power generation means;
Power storage means for storing the charge rectified by the rectifying means,
The power generation means includes
A bias magnet magnetized in two poles;
A magnetostrictive material that changes the magnetic permeability generated by one pole of the bias magnet by changing the magnetic permeability due to the inverse magnetostriction effect by applying force from the outside; and
A compression means disposed between the bias magnet and the magnetostrictive material and applying a periodic amplitude force to the magnetostrictive material;
A closed magnetic path forming member arranged to guide the magnetic flux flowing out of the magnetostrictive material to the other pole of the bias magnet;
A coil wound around the magnetostrictive material or the closed magnetic path forming member,
A power generation device configured to supply a current induced by the power generation means to the rectification means via a coil terminal of the coil. The compression means includes
An actuating lever;
A feed screw that rotates due to the force applied to the actuating lever;
A compression member made of a soft magnetic material, in contact with the magnetostrictive material, and sent in the axial direction of the feed screw with a force expanded by the rotation of the feed screw;
A return spring provided integrally with the actuating lever and removing the force and displacement applied to the compression member by rotating the feed screw in the reverse direction, and again applying force and displacement to the actuating lever; The power generation device according to claim 1, comprising: The power storage device according to claim 1 or 2 is connected to a low-voltage drive device,
The low-voltage drive device is driven using the electric charge stored in the power storage means.

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