JP2013066276A - Inertial drive actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inertial drive actuator that reduces wiring used in driving two movable bodies.SOLUTION: An inertial drive actuator has: an electromagnet; a first movable body that is arranged in a direction in which the electromagnet produces magnetic flux; a second movable body that is arranged in the direction in which the electromagnet produces magnetic flux; displacement generating means; and a drive circuit that drives the electromagnet and the displacement generating means. The inertial drive actuator controls magnetic force that is exerted on the first movable body and the second movable body from the electromagnet, in response to the displacement generated by the displacement generating means, to control friction to the first movable body and the second movable body. The first movable body and the second movable body are permanent magnets, and have opposite magnetic poles facing each other. The first movable body and the second movable body are aligned along a direction of displacement by the displacement generating means. Respective ranges of movement of the first movable body and the second movable body by the single electromagnet overlap with each other in the same plane.

Description

  The present invention relates to an inertial drive actuator.

  FIG. 6 is a perspective view showing a configuration of a conventional inertial drive actuator described in Patent Document 1. As shown in FIG. In the conventional inertial drive actuator shown in FIG. 6, one end of the piezoelectric element 902 is fixed to the fixing member 901, and the other end is fixed to one end of the vibration substrate 903. A movable body 904 that can move in the vibration direction of the piezoelectric element 902 is disposed on the vibration substrate 903. The moving body 904 includes a suction portion 904a, a coil 905, and a protrusion 907. The protrusion 907 is provided on the opposite side of the surface of the suction portion 904a facing the vibration substrate 903. A coil 905 is formed on the protrusion 907.

  The drive circuit 920 is connected to the piezoelectric element 902 and the coil 905, respectively. Here, the fixing member 901 or the vibration substrate 903 is made of a magnetic material, and the attracting portion 904a is also a magnetic material. The bottom surface of the suction portion 904a is in contact with the vibration substrate 903, and a magnetic field is generated when a current is applied to the coil 905. Since the generated magnetic field passes through the moving body 904 that is a magnetic body, a magnetic field is also generated in the attracting portion 904a. A magnetic attraction force is generated on the vibration substrate 903 or the fixing member 901 by the magnetic field generated on the adsorption portion 904a. As a result, the moving body 904 and the vibration substrate 903 come into close contact with each other, and a frictional force is generated therebetween.

JP 2009-177974 A

  In the above-described conventional inertial drive actuator, normally, one electromagnet is required for one moving body. Therefore, when two moving bodies are used, two electromagnets are required. In such a configuration, the moving range of each moving body is limited only to the corresponding electromagnet, and each moving range cannot be shared.

  The present invention has been made in view of the above, and an object of the present invention is to provide an inertial drive actuator in which each moving body can share a moving range when driving two moving bodies.

  In order to solve the above-described problems and achieve the object, an inertial drive actuator according to the present invention includes one electromagnet, a first moving body arranged in the direction of magnetic flux generation of the electromagnet, and the direction of magnetic flux generation of the electromagnet. And a drive circuit that drives the electromagnet and the displacement generating means, and the first moving body and the second movement from the electromagnet with respect to the displacement generated by the displacement generating means. An inertial drive actuator that controls friction with respect to the first moving body and the second moving body by controlling a magnetic force acting on the body, wherein the first moving body and the second moving body are permanent magnets, and the first moving body and The magnetic poles of the second moving body are opposite to each other, the first moving body and the second moving body are arranged side by side in the displacement direction by the displacement generating means, and the moving range of the first moving body and the second moving body by one electromagnet In the same plane It is characterized in that partially overlap and have.

  In the inertial drive actuator according to the present invention, it is preferable that the electromagnet is connected to the displacement generating means.

  In the inertial drive actuator according to the present invention, it is preferable that an intermediate member is disposed between the first moving body and the second moving body and the electromagnet, and a displacement generating means is connected to the intermediate member.

  In the inertial drive actuator according to the present invention, the electromagnet and the intermediate member are preferably connected to the displacement generating means.

  In the inertial drive actuator according to the present invention, the electromagnet and the intermediate member are preferably connected to each other.

  In the inertial drive actuator according to the present invention, the intermediate member is preferably interposed between the electromagnet and the displacement generating means.

  In the inertial drive actuator according to the present invention, it is preferable to dispose a magnetic body on each of the first moving body and the second moving body.

  In the inertial drive actuator according to the present invention, it is preferable that the first moving body, the second moving body, and the magnetic body are connected to each other.

  The inertial drive actuator according to the present invention has an effect that wiring can be saved when two moving bodies are driven.

It is a side view which shows the structure of the inertial drive actuator which concerns on 1st Embodiment. It is a side view which shows the structure of the inertial drive actuator which concerns on 2nd Embodiment. It is a side view which shows the structure of the inertial drive actuator which concerns on 3rd Embodiment. It is a side view which shows the structure of the inertial drive actuator which concerns on 4th Embodiment. It is a front view which shows the structure of the inertial drive actuator which concerns on the modification of 4th Embodiment. It is a perspective view which shows the structure of the conventional inertial drive actuator.

Embodiments of an inertial drive actuator according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by the following embodiment.
(First embodiment)
FIG. 1 is a side view showing the configuration of the inertial drive actuator 100 according to the first embodiment.
The inertial drive actuator 100 according to the first embodiment includes one electromagnet 110, a first moving body 120, a second moving body 130, a piezoelectric element 140 as a displacement generating unit, and a drive circuit 160.

  The electromagnet 110 has a configuration in which a coil 112 is wound around a core material 111, and a magnetic flux is generated from the electromagnet 110 in the vertical direction of FIG. Both ends 112a and 112b of the conducting wire constituting the coil 112 are connected to two terminals 161 and 162 of the drive circuit 160, respectively. Although not shown, the drive circuit 160 is also connected to the piezoelectric element 140. The drive circuit 160 drives the electromagnet 110 and the piezoelectric element 140.

  On the upper surface 113 of the core material 111, the 1st moving body 120 and the 2nd moving body 130 are mounted along with right and left. The first moving body 120 and the second moving body 130 are permanent magnets, and are placed so that the magnetic poles are opposite to each other. Specifically, in the first moving body 120, the S pole is arranged on the lower surface 122 side arranged on the upper surface 113 side of the core material 111, and the N pole is arranged on the upper surface 121 side. In the second moving body 130, the N pole is arranged on the lower surface 132 side arranged on the upper surface 113 side of the core material 111, and the S pole 131 is arranged on the upper surface 131 side.

  Therefore, the first moving body 120 and the second moving body 130 are arranged with the N pole and the S pole along the magnetic flux generation direction of the electromagnet 110. When the electromagnet 110 is driven to generate magnetic flux, one of the first moving body 120 and the second moving body 130 is attracted to the electromagnet 110 and the other repels the electromagnet 110.

  One side surface 142 of the piezoelectric element 140 is connected to one side surface 114 of the core material 111. The other side surface 141 of the piezoelectric element 140 is connected to the fixing member 150. When the piezoelectric element 140 is driven by the drive circuit 160, the electromagnet 110 connected to the piezoelectric element 140 is displaced in a direction away from the fixing member 150. Here, the first moving body 120 and the second moving body 130 are arranged side by side in the displacement direction by the piezoelectric element 140.

The other side surface 115 of the core material 111 is connected to an elastic member (not shown). This elastic member urges the electromagnet 110 toward the fixed member 150 by its elastic force.
Connections between the fixing member 150 and the piezoelectric element 140, between the piezoelectric element 140 and the core material 111, and between the core material 111 and the elastic member are made by, for example, adhesion.

  In the above configuration, the first moving body 120 and the second moving body are controlled by controlling the magnetic force acting on the first moving body 120 and the second moving body 130 from the electromagnet 110 with respect to the displacement generated by the piezoelectric element 140. The friction against 130 is controlled independently.

Here, in the inertial drive actuator that controls the friction of the moving body by the magnetic flux of the electromagnet, conventionally, one electromagnet is required for each moving body. Therefore, in order to independently control the two moving bodies, two electromagnets are necessary, and two sets (four reciprocating wires) of wiring are necessary.
In contrast, in the inertial drive actuator 100 of the first embodiment, the magnetic force acting on the two moving bodies 120 and 130 is independently controlled by one electromagnet 110. By such control, the movement of the first moving body 120 and the second moving body 130 can be controlled independently of each other.

  Further, since the magnetic force acting on the two moving bodies 120 and 130 can be controlled by one electromagnet 110, the moving range A120 of the first moving body 120 and the moving range A130 of the second moving body 130 are on the upper surface 113 of the core 111. Some overlap. In other words, the moving ranges of the first moving body 120 and the second moving body 130 by one electromagnet 110 partially overlap in the same plane. Thereby, the moving range of the two moving bodies 120 and 130 can be shared, and the moving range of the moving body can be expanded as compared with the case where two moving bodies are used in the conventional inertial drive actuator.

For example, a case where the first moving body 120 is moved leftward and the second moving body 130 is moved rightward will be described.
First, a current is applied from the terminal 162 of the driving circuit 160 to the terminal 161. Then, the magnetic flux of the electromagnet 110 becomes the N pole on the upper surface 113 facing the first moving body 120 and the second moving body 130 and the S pole on the lower surface. Therefore, the first moving body 120 is attracted to the electromagnet 110, and the second moving body 130 is repelled. In this state, the piezoelectric element 140 is extended by applying a voltage from the drive circuit 160 to the piezoelectric element 140. At this time, since the side surface 141 is connected to the fixing member 150, the piezoelectric element 140 does not extend in the right direction in FIG. 1 but extends toward the electromagnet 110. Therefore, the electromagnet 110 is displaced in the left direction in FIG. Since the first moving body 120 is attracted to the electromagnet 110 and has a strong friction with the upper surface 113 of the core material 111, it is displaced together with the electromagnet 110 in the extending direction of the piezoelectric element 140, that is, in the left direction. On the other hand, since the second moving body 130 is repelled from the electromagnet 110, the friction with the upper surface 113 of the core material 111 is weak, so that the second moving body 130 remains in place due to inertia against the expansion of the piezoelectric element 140.

  Next, when a current is applied from the terminal 161 of the drive circuit 160 to the terminal 162, the magnetic flux of the electromagnet 110 causes the upper surface 113 facing the first moving body 120 and the second moving body 130 to be the S pole and the lower surface to be the N pole. . For this reason, the 1st moving body 120 repels with respect to the electromagnet 110, and the 2nd moving body 130 adsorb | sucks to the electromagnet 110. FIG. In this state, when the voltage applied from the drive circuit 160 to the piezoelectric element 140 is 0 V, the piezoelectric element 140 contracts. Since one side surface 114 of the core material 111 is bonded to the piezoelectric element 140 and the other side surface 115 is pressed by the elastic member, the electromagnet 110 is displaced in the contracting direction by contraction of the piezoelectric element 140. Accordingly, since the second moving body 130 is attracted to the electromagnet 110 and has a strong friction with the upper surface 113 of the core material 111, the electromagnet 110 and the piezoelectric element 140 are contracted in the contracting direction, that is, rightward. Displace. On the other hand, since the first moving body 120 repels the electromagnet 110 and has low friction, the first moving body 120 remains in place due to inertia against the contraction of the piezoelectric element 140.

By repeatedly applying the current to the two moving bodies 120 and 130 and applying the voltage to the piezoelectric element 140 as described above, the first moving body 120 is moved to the left and the second moving body 130 is moved to the right. Each can be moved in the direction.
On the other hand, by reversing the combination of the application of current to the two moving bodies 120 and 130 and the application of voltage to the piezoelectric element 140, the first moving body 120 is moved to the right in the second direction. Each of the bodies 130 can be moved leftward.

  Therefore, by repeatedly expanding and contracting the piezoelectric element 140 and driving the electromagnet 110, the two moving bodies 120 and 130 can be moved in arbitrary directions, respectively. In other words, by controlling the magnetic force acting on the first moving body 120 and the second moving body 130 from the electromagnet 110 with respect to the displacement generated by the piezoelectric element 140 as the displacement generating means, The friction with respect to the two moving bodies 130 can be controlled independently. Therefore, the first moving body 120 and the second moving body 130 can be controlled independently from each other by one electromagnet 110.

  In addition, the friction state of the first moving body 120 and the second moving body 130 with respect to the electromagnet 110 (the upper surface 113 of the core material 111) when the electromagnet 110 is not driven varies depending on the configuration, but the frictional force is strong. In this case, the state in which the frictional force is reduced by the repulsion of the electromagnet 110 and the first moving body 120 or the second moving body 130 is mainly used. When the frictional force is weak, the electromagnet 110 and the first moving body 120 or the second A state where the frictional force due to the adsorption of the moving body 130 is increased is mainly used.

(Second Embodiment)
FIG. 2 is a side view showing the configuration of the inertial drive actuator 200 according to the second embodiment.
In the inertial drive actuator according to the second embodiment, an intermediate member 270 is disposed between the first moving body 120 and the second moving body 130 and the electromagnet 110, and the intermediate member 270 has a piezoelectric element as a displacement generating means. The point 240 is connected to the inertial drive actuator 100 according to the first embodiment. Other configurations are the same as those of the inertial drive actuator 100 according to the first embodiment. The same members are denoted by the same reference numerals, and detailed description thereof is omitted.

  If the core material 111 of the electromagnet 110 is a magnetic body, the friction between the first moving body 120 and the second moving body 130 that are magnets may be too large. In such a case, when the piezoelectric element 240 is expanded and contracted in a state where magnetic flux is generated in the electromagnet 110, the moving body that should remain in place due to the repulsion with the electromagnet 110 has a large friction with the core material 111, so There is a risk of displacement with the element 240. In order to avoid such a situation, the friction between the core member 111 and the first moving body 120 and the second moving body 130 is adjusted by arranging the intermediate member 270.

In addition, one side surface 242 of the piezoelectric element 240 is connected to the side surface 272 of the intermediate member 270. The other side surface 241 of the piezoelectric element 240 is connected to the fixing member 150. The side surfaces 241 and 242 are connected by, for example, adhesion.
In the inertial drive actuator 100 of the first embodiment, the piezoelectric element 140 is connected to the side surface of the core 111 to displace the electromagnet 110, whereas in the inertial drive actuator 200 of the second embodiment, the piezoelectric element 140 is displaced. The element 240 is connected to the side surface 272 of the intermediate member 270.
If the intermediate member 270 is not fixed to the core material 111 of the electromagnet 110 and can be moved to the left and right on the upper surface 113, the side surface 272 of the intermediate member 270 and the side surface 242 of the piezoelectric element 240 have substantially the same area. The displacement of the element 240 is easily transmitted to the intermediate member 270 efficiently.

Further, the moving range A120 of the first moving body 120 and the moving range A130 of the second moving body 130 partially overlap on the upper surface 271 of the intermediate member 270 that substantially corresponds to the upper surface 113 of the core member 111. Thereby, the moving range of the two moving bodies 120 and 130 can be shared, and the moving range of the moving body can be expanded as compared with the case where two moving bodies are used in the conventional inertial drive actuator.
In addition, about another structure, an effect | action, and an effect, it is the same as that of 1st Embodiment.

(Third embodiment)
FIG. 3 is a side view showing the configuration of the inertial drive actuator 300 according to the third embodiment.
The inertial drive actuator 300 according to the third embodiment is different from the inertial drive actuator 200 according to the second embodiment in that the electromagnet 110 and the intermediate member 270 are connected to a piezoelectric element 340 as a displacement generating unit. The other configuration is the same as that of the inertial drive actuator 200 according to the second embodiment, and the same reference numerals are used for the same members, and detailed descriptions thereof are omitted.

  In inertial drive actuator 300, side surface 272 of intermediate member 270 and side surface 114 of core material 111 are connected to one side surface 342 of piezoelectric element 340. The other side surface 341 of the piezoelectric element 340 is connected to the fixing member 150. These connections are made by, for example, adhesion.

The intermediate member 270 may be formed on the upper surface 113 of the core material 111 by coating, or may be formed of a member separate from the core material 111. In the latter case, the intermediate member 270 is preferably connected to the core member 111 by, for example, adhesion.
With the above configuration, when the piezoelectric element 340 is expanded and contracted, the electromagnet 110 and the intermediate member 270 are displaced in a direction corresponding to the expansion and contraction.
In addition, about another structure, an effect | action, and an effect, it is the same as that of 2nd Embodiment.

(Fourth embodiment)
FIG. 4 is a side view showing the configuration of the inertial drive actuator 400 according to the fourth embodiment.
The inertial drive actuator 400 according to the fourth embodiment differs from the inertial drive actuator 100 according to the first embodiment in that an intermediate member 470 is interposed between the electromagnet 110 and the piezoelectric element 440. Other configurations are the same as those of the inertial drive actuator according to the second embodiment, and the same reference numerals are used for the same members, and a detailed description thereof is omitted.

  Similar to the intermediate member 270 of the second embodiment, the intermediate member 470 is provided on the upper surface 113 of the core material 111, thereby causing friction between the core material 111 and the first moving body 120 and the second moving body 130. adjust.

  Further, the intermediate member 470 includes a side wall 472 between the intermediate member 470 and the piezoelectric element 440. The side wall 472 is interposed between the electromagnet 110 and the piezoelectric element 440, one side surface 473 is connected to the side surface 442 of the piezoelectric element 440, and the other side surface 474 is connected to the side surface 114 of the core material 111. The other side surface 441 of the piezoelectric element 440 is connected to the fixing member 150. These connections are made by, for example, adhesion.

  With such a configuration, when the side surface of the core material 111 is covered with the intermediate member 470, the contact area between the intermediate member 470 and the piezoelectric element 440 can be increased, and thereby the intermediate member 470 can be displaced efficiently, The first moving body 120 and the second moving body 130 can be reliably displaced to desired positions.

Further, the movement range A120 of the first moving body 120 and the movement range A130 of the second moving body 130 partially overlap on the upper surface 471 of the intermediate member 470 in a range that substantially corresponds to the upper surface 113 of the core member 111. . Thereby, the moving range of the two moving bodies 120 and 130 can be shared, and the moving range of the moving body can be expanded as compared with the case where two moving bodies are used in the conventional inertial drive actuator.
In addition, about another structure, an effect | action, and an effect, it is the same as that of 2nd Embodiment.

FIG. 5 is a front view showing a configuration of an inertial drive actuator according to a modification of the fourth embodiment. FIG. 5 is a view of the core material 111 as viewed from the side surface 115 side.
In the modification shown in FIG. 5, the magnetic body 480 is disposed on the first moving body 120. The magnetic body 480 includes an upper wall 481 placed on the upper surface 121 of the first moving body 120 and side walls 482 and 483 extending downward from both ends of the upper wall 481. The side walls 482 and 483 have shapes that cover the core material 111 of the electromagnet 110. The magnetic body 480 may be magnetically attracted to the upper surface 121 of the first moving body 120, or may be connected by adhesion, for example.
Although not shown in FIG. 5, a magnetic body similar to the magnetic body 480 is also disposed on the second moving body 130.
With such a configuration, the magnetic fluxes of the first moving body 120 and the second moving body 130 and the electromagnet 110 can be closed.

  As described above, the inertial drive actuator according to the present invention is useful as an inertial drive actuator that drives two moving bodies.

DESCRIPTION OF SYMBOLS 100 Inertial drive actuator 110 Electromagnet 111 Core material 112 Coil 113 Upper surface 114, 115 Side surface 120 1st moving body 130 2nd moving body 140 Piezoelectric element 141, 142 Side surface 150 Fixed member 160 Drive circuit 200 Inertial drive actuator 240 Piezoelectric element 241,242 Side surface 270 Intermediate member 271 Upper surface 272 Side surface 300 Inertial drive actuator 340 Piezoelectric element 341, 342 Side surface 400 Inertial drive actuator 440 Piezoelectric element 441, 442 Side surface 470 Intermediate member 471 Upper surface 472 Side wall 473, 474 Side surface

Claims (8)

One electromagnet,
A first moving body arranged in the direction of magnetic flux generation of the electromagnet;
A second moving body disposed in the direction of magnetic flux generation of the electromagnet;
A displacement generating means;
A drive circuit for driving the electromagnet and the displacement generating means;
Have
The friction with respect to the first moving body and the second moving body is controlled by controlling the magnetic force acting on the first moving body and the second moving body from the electromagnet with respect to the displacement generated by the displacement generating means. An inertial drive actuator,
The first moving body and the second moving body are permanent magnets,
The magnetic poles of the first moving body and the second moving body are opposite to each other,
The first moving body and the second moving body are arranged side by side in the displacement direction by the displacement generating means,
The inertial drive actuator according to claim 1, wherein movement ranges of the first moving body and the second moving body by the one electromagnet partially overlap in the same plane.   The inertial drive actuator according to claim 1, wherein the electromagnet is connected to the displacement generating means.   The intermediate member is disposed between the first moving body, the second moving body, and the electromagnet, and the displacement generating unit is connected to the intermediate member. Inertial drive actuator.   The inertial drive actuator according to claim 3, wherein the electromagnet and the intermediate member are connected to the displacement generating means.   The inertial drive actuator according to claim 4, wherein the electromagnet and the intermediate member are connected to each other.   The inertial drive actuator according to any one of claims 3 to 5, wherein the intermediate member is interposed between the electromagnet and the displacement generating means.   The inertial drive actuator according to any one of claims 1 to 6, wherein a magnetic body is disposed on each of the first moving body and the second moving body.   The inertial drive actuator according to claim 7, wherein the first moving body, the second moving body, and the magnetic body are connected to each other.

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