JP2008212848A - Actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an actuator capable of converting the rotation of a rotary motor into the reciprocating motion of a driven body part by noncontact, and easily applied for a mechanism for directly driving the movable blade of an electric razor. <P>SOLUTION: The actuator is equipped with two disc-like rotary side magnet parts 4 which are connected to the rotary shaft projecting at both ends of the rotary motor 2 respectively, and have four axially magnetized fan-like magnet bodies 4a at least adjacently disposed in a rotational direction with the adjacent magnetic poles having different magnetic poles on the same surface side. Furthermore, the actuator is equipped with two drive-side magnet parts 5 which are oppositely disposed on the outside of the respective rotation-side magnet parts 4 and have at least a magnetic pole opposing the outside magnetic pole surface of the rotation-side magnet parts 4, and a driven body part 1 which is disposed in parallel axially, and connected to the respective drive side magnet parts 4, 4 by through ends in the axial direction, wherein the respective drive-side magnet parts 4, 4 are swingablly supported on a casing body 3 by spring bodies 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an actuator used for an electric razor or the like.

Conventionally, there has been provided an actuator (linear oscillator) that rotates a disk-shaped permanent magnet body with a rotary motor and swings a similar disk-shaped permanent magnet body opposed to the permanent magnet body in the axial direction (for example, Patent Document 1).
JP 2005-348469 A

  Since the actuator disclosed in Patent Document 1 retaliates the shaft body once connected to the center of the swinging permanent magnet body, it can be used as an electric toothbrush actuator by attaching a toothbrush or the like to the shaft body. However, it could not be used for a mechanism that can directly drive the movable blade of an electric razor.

  Therefore, an actuator that can be used in a mechanism that directly drives a movable blade of an electric razor is desired.

  The present invention has been made in view of the above points, and the object of the present invention is to convert the rotation of a rotary motor into a reciprocating motion of a driven body portion in a non-contact manner and directly drive a movable blade of an electric razor. An object of the present invention is to provide an actuator that can be easily applied to such a mechanism.

  In order to achieve the above-mentioned object, according to the invention of claim 1, at least two magnet bodies magnetized in the axial direction are respectively arranged adjacent to the rotary shafts that can project at both ends of the rotary motor, and at least adjacent to each other in the rotational direction. In addition, at least one magnetic pole facing the outer magnetic pole surface of the rotating side magnet unit and two rotating side magnet units arranged so that adjacent magnetic poles on the same surface side are different from each other and the outer side of each rotating side magnet unit are opposed to each other. Two drive-side magnet portions, a driven body portion arranged so as to be parallel to the axial direction, and a spring body that urges each of the drive-side magnet portions to swing in the axial direction. The driven body portion is characterized in that both end sides in the axial direction are connected to the corresponding driving side magnet portions.

  According to the first aspect of the present invention, the rotation of the rotary motor can be converted into the reciprocating motion of the driven body portion in a non-contact manner, and it is only necessary to provide the drive side magnet portions on both sides of the driven body portion. For example, by using a movable blade of an electric razor as a driven body portion, it is possible to easily obtain a mechanism that directly drives the movable blade in a reciprocating manner, and furthermore, efficient driving can be performed by resonance by a spring body.

  According to a second aspect of the present invention, in the first aspect of the present invention, the two driven body portions are provided in parallel, and two driving side magnet portions corresponding to the respective driven body portions are provided on the respective rotating side magnet portions. It is arranged outside.

  According to the second aspect of the present invention, the two driven body portions can be reciprocally driven by one rotary motor, and can be applied to, for example, an electric razor provided with two movable blades.

  According to a third aspect of the invention, in the second aspect of the invention, each driven side of each driven body portion facing the magnetic pole of each rotating side magnet portion so that the propulsion directions of both driven body portions are opposite to each other. The magnetic pole of the magnet part is set.

  According to the invention of claim 3, a counter operation for reciprocating both driven body portions in opposite directions is obtained.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the drive-side magnet portion is provided with two different magnetic poles respectively opposed to the magnetic poles of two adjacent magnet bodies of the rotation-side magnet portion. It is characterized by being.

  According to the fourth aspect of the present invention, the magnetic flux can be effectively used by setting the number of magnetic poles of the rotating side magnet portion and the number of magnetic poles of the driving side magnet portion to the same number, and as a result, a large driving force can be obtained. it can.

  The present invention can convert the rotation of the rotary motor into the reciprocating motion of the driven body portion in a non-contact manner, and it is only necessary to provide the drive side magnet portions on both sides of the driven body portion. By using the blade as the driven body portion, it is possible to obtain a mechanism for directly reciprocating the movable blade, and there is an effect that efficient driving can be performed by resonance by the spring body.

  Embodiments of the present invention will be described below.

(Embodiment 1)
In this embodiment, as shown in FIG. 1, an actuator having a movable blade (inner blade) of an electric razor as a driven body portion 1 is configured, and a rotary motor 2 configured by a DC motor as shown in FIG. The rotating shaft (not shown) is fixedly held on the bottom of the housing 3 so that the rotating shaft (not shown) is parallel to the bottom of the razor housing 3, and disk-shaped rotating side magnets are provided at both ends of the rotating shaft protruding on both sides of the rotary motor 2. The rotation side magnet portions 4 are rotated in the same direction by the rotary motor 2 by connecting the centers of the portions 4.

  Each rotation-side magnet portion 4 is composed of four magnet bodies 4a having fan-shaped magnetic poles with an angle of 90 ° when viewed from the center, and each magnet body 4a has an axial direction so that adjacent magnetic poles have different polarities. The opposite magnetic poles of the magnet bodies 4a of the rotation-side magnet portions 4 on both sides are made the same polarity.

  And on the outer sides of the rotation side magnet portions 4 on both sides, the end portions of the leg portions 1a, 1a suspended from both ends of the driven body portion 1 composed of movable blades arranged in parallel in the axial direction of the rotary motor 2 are provided. Disc-shaped drive-side magnet portions 5 connected to the side peripheral portions are respectively opposed to each other.

  These drive side magnet parts 5 are composed of four fan-like magnet bodies 5a having the same diameter as the rotation side magnet part 4 and similarly magnetized, and are arranged on both end sides of the driven body part 1. The magnetic poles of the magnet bodies 5a facing the magnet portions 5 and 5 are different polarities.

  And one end is connected to the center of the outer surface of these drive side magnet parts 5, and the other end is connected to the inner wall surface of case 3, and the outer surface of each drive side magnet part 5 and the inner wall surface of case 3 are connected. A driven body portion 1 including drive side magnet portions 5 and 5 is supported on the housing 3 so as to be swingable in the axial direction of the rotary motor 2 by a coiled spring body 6 interposed therebetween.

  Thus, for example, when the rotary motor 2 is rotated in the direction of the arrow, the rotation-side magnet portions 4 and 4 on both sides are also rotated by this rotation, and each magnet body 4a of each rotation-side magnet portion 4 is accompanied with this rotation. The magnetic poles of the respective magnetic bodies 5a of the drive-side magnet portions 5 are repelled when the opposing area of the magnetic pole parts of the same polarity is larger than the opposing area of the magnetic pole parts of the different polarity on one side. Then, the opposing area of the magnetic pole parts of different polarity is larger than the opposing area of the magnetic pole parts of the same polarity, and the repulsive force and the attractive force in the same direction serve as a driving force to move the driven body part 1 in one direction. Move to.

  In this movement, the spring body 6 is compressed against the biasing force of the spring body 6 on the above-mentioned repulsion side, and the spring body 6 is extended against the restoring force on the above-mentioned suction side.

  And in the rotation position where the opposing area with one magnetic pole of each magnet body 5a of each drive side magnet part 5 that opposes one magnetic pole of each magnet body 4a of each rotation side magnet part 4 is the same pole, The repulsive force and the attractive force opposite to the opposite pole are maximized, and the driven body portion 1 moves to the moving end in one direction.

  Then, as each rotation-side magnet portion 4 rotates, the opposing area of the magnetic pole parts of the same polarity of each magnet body 4a and each magnet body 5a on the one-direction side is changed to the opposite area of the magnetic pole part of the opposite polarity. When the opposing areas of the magnetic pole parts of the different polarities of the magnet bodies 4a and 5a at each of the magnet bodies change so as to be close to the opposing areas of the magnetic pole parts of the same polarity, the unidirectional propulsion consisting of the repulsive force and the attractive force The magnitude of the force also changes, and the driven body portion 1 starts to move in the other direction by the counter-propulsive force composed of the urging force and the return force of the spring bodies 6 on both sides.

  And with the further rotation of each rotation side magnet portion 4, the opposing area of the magnetic pole part of the same polarity of each magnet body 4a and each magnet body 5a on one side is smaller than the opposing area of the magnetic pole part of a different polarity, When the opposing area of the different magnetic pole parts of each magnet body 4a and each magnet body 5a on the other direction side is smaller than the opposing area of the same magnetic pole part, the attractive force between the different magnetic pole parts on the one direction side. Is larger than the repulsive force between the magnetic pole parts of the same polarity and attracts, and the repulsive force between the magnetic pole parts of the same polarity is larger than the attractive force of the magnetic pole parts of the opposite polarity on the other direction side, The suction force and the repulsive force in the same direction serve as a propulsive force to move the driven body portion 1 in the other direction.

  Thus, in this embodiment, by rotating each rotation side magnet part 4 with the rotation motor 2, the driven body part 1 can be converted into a reciprocating motion in the axial direction without contact.

  If the rotational speed of the rotary motor 2, that is, the number of reciprocations of the driven body portion 1, is set so as to resonate the spring bodies 6 on both sides, it can be driven efficiently.

Further, in the present embodiment, since the rotation-side magnet portions 4 and 4 are formed in a disk shape, there is no influence on the drive of the driven body portion 1 due to the rotation angle, and an efficient drive can be performed.
(Embodiment 2)
In the first embodiment, the number of the driven body portions 1 is one. However, the present embodiment is characterized in that the two driven body portions 1 are driven at the same time, and is arranged in parallel as shown in FIG. The drive-side magnet unit 5 made of a rectangular parallelepiped or a cubic magnet is connected to the lower ends of the leg portions 1a and 1a at both ends of the driven bodies 1 and 1, respectively, and one magnetic pole of each drive-side magnet unit 5 is connected to the drive-side magnet unit 5. The outer side magnetic pole surface of the rotation side magnet part 4 is made to oppose, and the back surface of each drive side magnet part 5 is supported by the housing | casing (not shown) with the spring body 6. FIG. The opposing magnetic poles of the two drive-side magnet portions 5 and 5 of each driven body portion 1 are different magnetic poles. Since the structure of the rotary motor 2 and the rotation side magnet part 4 is the same as Embodiment 1, description is abbreviate | omitted.

  Thus, in the present embodiment as well, in the same manner as in the first embodiment, the rotation-side magnet unit 4 is rotated by the rotary motor 2 to correspond to the magnetic poles of the drive-side magnet unit 5 at both ends of each driven body unit 1. A repulsive force is generated on one side and an attractive force is generated on the other side between the magnetic poles of the magnet body 4a of each rotating side magnet portion 4, and each driven portion 1 can be reciprocated.

Here, if the magnetic poles opposed to the magnetic pole surfaces of the rotation side magnet part 4 of the drive side magnet part 5 adjacent to the driven part 1 on both sides are made different, the driving directions of the driven part 1 on both sides are made to be opposite. Thus, a so-called counter operation is obtained.
(Embodiment 3)
In the second embodiment, each drive-side magnet unit 5 provided in each driven-body unit 1 is configured by a single magnet body. However, as shown in FIG. The two magnet bodies 5b and 5b that are coupled together constitute the drive-side magnet section 5. The magnetic poles facing the same direction of the two magnet bodies 5b and 5b have different polarities. The opposing magnetic poles of the magnet bodies 5b and 5b of the driving-side magnet unit 5 provided on the opposite side are also different.

  The upper and lower magnet bodies 5b, 5b are arranged at the same pitch with the two adjacent magnet bodies 4a, 4a of the rotation-side magnet section 4, and thereby the four magnet bodies 5b of the driven body sections 1 on both sides. And the four magnet bodies 4a of the rotation-side magnet unit 4 have the same number of magnetic poles as that of the rotation-side magnet unit 4 and the number of magnetic poles on the drive side. You can gain power.

  Here, if the magnetic poles opposed to the magnetic pole surfaces of the rotating magnet portions 4 of the upper and lower magnet bodies 5b and 5b of the adjacent driving magnet portions 5 of the driven body portions 1 on both sides are made different at the upper and lower positions, the driven surfaces on both sides are changed. The driving directions of the body part 1 can be made opposite to each other, and so-called counter operation is obtained.

  In the present embodiment, the configurations of the rotary motor 2 and the rotation-side magnet unit 4 are the same as those in the first embodiment, and thus the description thereof is omitted.

  The number of magnetic poles of the rotation-side magnet unit 4 in each embodiment is four. However, if the number of poles is increased by setting two different poles as one set, the number of reciprocating drives (vibration) times (number of poles / 2) times the number of rotations. Is not limited to the number of poles of the embodiment.

FIG. 3 is a partially broken and omitted perspective view of the first embodiment. (a) is a perspective view of the principal part of Embodiment 2, (b) is a perspective view of the principal part of Embodiment 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Driven body part 1a Leg part 2 Rotation motor 3 Housing | casing 4 Rotation side magnet part 4a Magnet body 5 Drive side magnet part 5a Magnet body 6 Spring body

Claims (4)

Two rotating magnets are connected to the rotating shafts projecting at both ends of the rotating motor, and at least two magnet bodies magnetized in the axial direction are arranged at least adjacent to each other in the rotating direction, and adjacent magnetic poles on the same surface side are arranged differently. A rotation side magnet part;
Two drive-side magnet portions each having at least one magnetic pole opposed to the outer magnetic pole surface of the rotation-side magnet portion and arranged opposite to each rotation-side magnet portion;
A driven body portion disposed so as to be parallel to the axial direction;
A spring body that urges each of the drive side magnet portions to swing in the axial direction,
2. The actuator according to claim 1, wherein the driven body portion is connected to the respective driving side magnet portions corresponding to both end sides in the axial direction. The two driven body portions are provided in parallel, and two drive side magnet portions are arranged outside the respective rotation side magnet portions corresponding to the respective driven body portions. The actuator according to 1. The magnetic poles of each drive-side magnet portion of each driven-body portion facing the magnetic poles of each rotation-side magnet portion are set so that the propulsion directions of both driven-body portions are opposite to each other. The actuator according to claim 2. 4. The drive side magnet unit according to claim 1, wherein two different magnetic poles respectively facing the magnetic poles of two adjacent magnet bodies of the rotation side magnet unit are provided in the drive side magnet unit. 5. Actuator.

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