Linear actuator
First Claim
1. A linear actuator comprising:
- an output member supported on a fixing-side member so as to linearly reciprocate freely;
an elastic member for biasing the output member to a middle position of the linear reciprocation;
a permanent magnet fixed to the output member;
a coil for linearly reciprocating the output member by having a variable magnetic field act on the permanent magnet, the coil being fixed to the fixing-side material such that the coil faces one of magnetic poles of the permanent magnet;
a yoke composed of a magnetic member, wherein the yoke having a midway portion secured to the other magnetic pole of the permanent magnet, and the yoke extending to the exterior of the coil that positioned along an exterior of the permanent magnet with a space from the permanent magnet, and the yoke having an end portion disposed on an exterior of the coil with an air-gap therebetween;
wherein the yoke, the permanent magnet and the coil capable of forming a magnetic circuit; and
power supplier means for forming a variable magnetic field on the coil,wherein the output member is elastically supported by the elastic member with respect to the fixing-side member such that an inversional reciprocation of the output member is occurred while a linear reciprocation of the output member is occurred, said inversional reciprocation being generated by elastic deformation of the elastic member by the linear reciprocation, and said inversional reciprocation being a movement repeatedly carrying out a rotational movement that the output member rotates a predetermined degree of angle in a forward direction and then rotates the same degree of angle in a reverse direction.
1 Assignment
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Accused Products
Abstract
Provided is a linear actuator which is simple in structure, inexpensive to manufacture, in addition, has small magnetic leakage, and can provide a large inertial force without increasing the number of parts and weight.
The linear actuator is provided with an output shaft 12 which is supported on a supporting case 11 so as to linearly reciprocate freely, an elastic member 13 which biases the output shaft 12 toward a middle position of the linear reciprocation thereof, a permanent magnet 14 which is fixed to the output shaft 12, a coil 15 which linearly reciprocates the output shaft 12 by having a variable magnetic field act on the permanent magnet 14 and is fixed to the supporting case 11 such that the coil 15 faces one of magnetic poles of the permanent magnet 14, a yoke 16, which is composed of a magnetic material, has a midway portion tightly secured to the other magnetic pole of the permanent magnet 14, extends to the exterior of the coil 15 along the exterior of the permanent magnet 14 with a space from the permanent magnet 14, and has an end portion disposed close to the exterior of the coil 15, and power supply means for forming a variable magnetic field on the coil 15.
45 Citations
7 Claims
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1. A linear actuator comprising:
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an output member supported on a fixing-side member so as to linearly reciprocate freely; an elastic member for biasing the output member to a middle position of the linear reciprocation; a permanent magnet fixed to the output member; a coil for linearly reciprocating the output member by having a variable magnetic field act on the permanent magnet, the coil being fixed to the fixing-side material such that the coil faces one of magnetic poles of the permanent magnet; a yoke composed of a magnetic member, wherein the yoke having a midway portion secured to the other magnetic pole of the permanent magnet, and the yoke extending to the exterior of the coil that positioned along an exterior of the permanent magnet with a space from the permanent magnet, and the yoke having an end portion disposed on an exterior of the coil with an air-gap therebetween;
wherein the yoke, the permanent magnet and the coil capable of forming a magnetic circuit; andpower supplier means for forming a variable magnetic field on the coil, wherein the output member is elastically supported by the elastic member with respect to the fixing-side member such that an inversional reciprocation of the output member is occurred while a linear reciprocation of the output member is occurred, said inversional reciprocation being generated by elastic deformation of the elastic member by the linear reciprocation, and said inversional reciprocation being a movement repeatedly carrying out a rotational movement that the output member rotates a predetermined degree of angle in a forward direction and then rotates the same degree of angle in a reverse direction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification