JP2000316267A - Vibrating linear actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibrating linear actuator capable of restraining vertical vibration of a moving element. SOLUTION: In this linear actuator, a moving element 2 and a fixed element 3 are made noncontact by using a retaining member 1, which can be displaced only in the operating direction and can not be displaced in the direction except the operation direction. In the retaining member 1, two leaf springs 4 make a pair, and a linkage member 5 is arranged between the two leaf springs 4. Both of the leaf springs 4 and the linkage member 5 are aligned in the vibrating direction. Both of the leaf springs 4 are laterally symmetric with respect to a center line perpendicularly intersecting the vibrating direction. The two leaf springs 4 are linked on the center line by the linkage member 5. The height of the fixed end of a moving element 2 side of the retaining member 1 is made equal to that of the fixed end of a frame 6 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type linear actuator which can be used for a reciprocating electric shaver or the like.

[0002]

2. Description of the Related Art Conventionally, a reciprocating electric shaver using a vibrating linear actuator has been disclosed in Japanese Unexamined Patent Publication No. 7-2655.
No. 59 is known.

[0003] This is a reciprocating motor for reciprocating the mover with respect to the stator, in which the mover and the stator have a non-contact structure, and can be displaced only in the movement direction. The mover is fixed to a fixed portion by a non-displaceable support, and the mover is held in a non-contact state with the stator. And, by holding the mover in a non-contact state with respect to the stator with the support in this way, the mover can move in a non-contact manner, and there is no sliding part, and the mover can be moved at high speed. As there is no sliding part, the life is extended.

[0004] However, in the above conventional example,
In this type, when the single support makes a pendulum motion, the amount of movement of the mover in the vertical direction is large, and as a result, vertical vibration is generated. There's a problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a vibration-type linear actuator capable of suppressing the vertical vibration of a mover. It is an issue.

[0006]

In order to solve the above-mentioned problems of the prior art and achieve the object of the present invention, the vibration type linear actuator of the present invention can be displaced only in the direction of movement, and can be displaced in directions other than the direction of movement. Impossible support 1 and mover 2 and stator 3
In a non-contact structure, a support 1 is a pair of two leaf springs 4 and a connecting body 5 is provided between the two leaf springs 4.
The two leaf springs 4 and the connecting body 5 are arranged in the vibration direction, and the two leaf springs 4 are symmetrical with respect to a center line orthogonal to the vibration direction. The fixed body 5 is connected by the connecting body 5, and the fixed end of the support 1 on the movable element 2 side and the fixed end of the support 6 on the frame 6 side have the same height. As described above, since both leaf springs 4 are symmetrical with respect to the center line orthogonal to the vibration direction, gap fluctuations in the vertical direction are completely eliminated, and propulsion loss can be eliminated. And in what constituted the reciprocating electric shaver using the vibration type linear actuator of the present invention, the vertical movement of the inner blade is eliminated, and the inner blade moves horizontally with respect to the outer blade,
The beard can be cut reliably.

It is preferable that the support 1 is constituted by providing a plurality of pairs of two leaf springs 4 and connecting ends of adjacent pairs. With such a configuration, a direction perpendicular to the vibration direction (vertical direction) while ensuring a spring constant
Can be reduced in size.

Further, it is preferable that the connecting body 5 is integrally formed by bending an end of the leaf spring 4. With such a configuration, the rigidity of the joint with the connector 5 can be ensured without requiring the connector 5 as a separate component.

It is preferable that a part or the whole of a plurality of pairs of the leaf springs 4 is formed integrally. By adopting such a configuration, the rigidity of the joint with the connecting body 5 can be ensured without requiring the connecting body 5 as a separate part.
It is easy to manufacture and has good dimensional assembly accuracy.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the accompanying drawings. FIG. 1 shows a principle diagram of an electric motor which is a vibration type linear actuator of the present invention, and FIGS. 2 to 7 show an embodiment of a motor which is a vibration type linear actuator provided with the mechanism shown in the principle diagram of FIG. 8, 9 and 10 show other embodiments of the support 1.

First, the basic configuration of a motor A which is a vibration type linear actuator of the present invention will be described with reference to the principle diagram of FIG.

The electric motor A is of a reciprocating type for reciprocating the mover 2 with respect to the stator 3. The mover 2 is composed of a permanent magnet 7a, a yoke 7b, and a frame member 8 that integrates them. The yoke 7b is made of a magnetic material and has a permanent magnet 7a bonded thereto. The stator 3 is constituted by an electromagnet in which a winding 9 is formed on a laminate of a sintered body of a magnetic material or an iron plate of a magnetic material. The stator 3 composed of an electromagnet is provided with a permanent magnet 7 a provided on the mover 2 and a gap 10.
Are opposed to each other.

Reference numeral 1 denotes a support for securing the gap 10 by holding the mover 2 in a non-contact state with the stator 3. This support 1 moves the mover 2 in the direction of movement (mover 2
The supporting body 1 can be displaced only in the direction of vibration and cannot be displaced in directions other than the direction of movement. It is arranged and arranged. The leaf spring 4 is made of spring steel or a molded product. The pair of leaf springs 4 and the connecting body 5 are arranged in the vibration direction of the mover 2 and are symmetrical with respect to a center line orthogonal to the vibration direction of the leaf springs. 4 are connected by a connecting body 5 on the center line L. That is, the two leaf springs 4 have the same length and the same inclination, and the connecting body 5 located on the center line L so that the same leaf spring 4 is symmetrical with respect to the center line L.
Are connected by The principle diagram shown in FIG. 1 and FIG.
In the embodiment shown in FIG. 7 to FIG. 7, one end of the two leaf springs 4 having the same length and orthogonal to the direction of movement and parallel to the direction of movement of the two leaf springs 4
The support 1 is constituted by being connected by.

The support 1 having the above configuration has one end serving as the fixed end 1a on the mover 2 side and the other end serving as the fixed end 1b on the frame 6 side. The fixed end 1a on the side is fixedly connected to the mover 2 (connected and fixed to the frame member 8 of the mover 2), and the fixed end 1b on the frame 6 side is fixed to the frame 6. Here, the fixed end 1a on the mover 2 side and the fixed end 1b on the frame 6 side have the same height.

Although not shown in the principle diagram shown in FIG. 1, the electromagnet constituting the stator 3 is fixed to the frame 6 by screws or other fixing means, or to another fixing portion.
Here, by changing the current direction of the electromagnet as the stator 3, the permanent magnet 7a attached to the mover 2 moves in the reciprocating direction. The reciprocating motor A is constructed by blocking the mover 2 and the stator 3 via the support 1 and the frame 6 as described above.

One or more movers 2 are provided. The mover 2 is provided with a driver 11.
The driven object is attached to the. For example, when the reciprocating electric motor A is used as a driving source of a reciprocating electric shaver, an inner blade having an inner blade is attached to the driver 11 so as to be vertically movable, and the inner blade is not shown. However, the inner cutter of the inner cutter body is elastically pushed upward by a push-up spring, so that the inner cutter is in elastic contact with the outer cutter.

In the reciprocating electric shaver using the electric motor A as a driving source according to the present embodiment, the driving frequency is determined by the natural frequency of the system. Therefore, in this case, the mover 2
Weight M of the actuator, the driver 11, and the driven object (for example, the inner blade body)
From the total spring constant K of the spring constant Kb of the leaf spring constituting the support 1 and the spring constant component Km due to the attractive force of the magnet, the frequency f = (1 / 2π) · (K / M) ^1/2 is obtained. It is determined.

Thus, by making the current direction of the electromagnet as the stator 3 alternate, the mover 2 moves in the reciprocating direction (the direction of the arrow in FIG. 1), but the mover 2 moves in the reciprocating direction. Then, since the support 1 is connected at the ends opposite to the fixed ends of the pair of leaf springs 4 by the connecting body 5, one of the leaf springs 4 and the other leaf spring 4 Will exercise. In this case, when one of the leaf springs 4 performs a pendulum motion, the other leaf spring 4 performs a pendulum motion with the connecting body 5 serving as a non-fixed end of the one of the leaf springs 4 that has made the pendulum motion as a fulcrum.
As described above, since the pendulum motions are in opposite directions, the movable element 2 does not move up and down as a whole. Further, the displacement of each leaf spring 4 can be reduced to half, and the length of the spring can be shortened, as compared with the case where a single leaf spring is formed as in the related art.

In the present invention, since both leaf springs 4 are symmetrical with respect to the center line L perpendicular to the vibration direction, gap fluctuation in the vertical direction is completely eliminated. The vertical movement of No. 2 becomes zero, and the propulsion loss can be eliminated. And
When the reciprocating electric razor is configured using the vibration type linear actuator of the present invention, the vertical movement of the inner blade is eliminated, and the inner blade moves horizontally with respect to the outer blade, so that the beard can be reliably cut. Become.

Next, an embodiment of the present invention will be described with reference to FIGS. The basic structure of the electric motor A, which is a vibration-type linear actuator shown in FIGS. 2 to 7, is the same as that shown in the principle diagram of FIG. 1 described above.

In this embodiment, an example is shown in which two movable elements 2 are provided, an inner movable element 2a and an outer movable element 2b. The inner movable element 2a has an inverted L-shaped projecting portion 12 provided on an upper portion thereof, and a driver 11 is provided on the upper portion of the projecting portion 12. The outer driver 2b is provided with a hole (not shown) vertically penetrating at the center, and the inner mover 2a is inserted into the hole, and the inner mover 2a is vibrated in the hole. It can be moved in any direction. A protrusion 13 is provided at a position opposing the protrusion 12 on the upper part of the outer movable element 2b, and the driver 11 is provided on the protrusion 13. A driven object is attached to each driver 11. For example, when a reciprocating electric motor A is used as a driving source of a reciprocating electric shaver, an inner blade body having an inner blade is vertically movable in each driver 11. Although not shown, the inner cutter is elastically pushed upward by a push-up spring, and the inner cutter of the inner cutter is elastically contacted with the outer cutter.

The inner movable element 2a can be displaced only in the movement direction (the direction of the arrow in FIG. 3) and cannot be displaced in other directions than the movement direction, as shown in the principle diagram of FIG. 2a and the stator 3 are supported so as not to be in contact with each other, and the outer mover 2 can be displaced only in the direction of movement, as shown in the principle diagram of FIG. The outer movable element 2b and the stator 3 are supported in a non-contact manner by the support 1 described above. The basic configuration of the support 1 is the same as the principle diagram shown in FIG. In the embodiment, the outer movable element 2b is supported by two sets of front and rear supports 1 on the left and right sides, and the inner movable element 2a is supported by one set of support bodies 1 on the left and right sides. . One set of the inner mover 2a and the outer mover 2b constituting the mover 2 or two sets of the support 1
The configuration of the connection is as described in the principle diagram of FIG.

A yoke 7b having a permanent magnet 7a bonded thereto is fixed to the inner movable member 2a and the outer movable member 2b in the same manner as described above. The polarity is made different, and the reciprocating direction of the inner movable member 2a and the outer movable member 2b is set to be opposite, so that the reciprocating drive of the driven object is reversed to reduce the vibration. .

The frame 6 is provided with a frame 6b for fixing the support on the left and right sides of the upper frame 6a (that is, in the moving direction of the mover 2). The fixed end 1b on the frame 6 side of one set of supports 1 for supporting one set of inner movers 2a located at the right side, or the frame 6 of two sets of front and rear supports 1 for supporting the outer mover 2b Side fixed end 1b
Is fixed.

The front and rear sides of the center of the upper frame 6b in the left-right direction (that is, the moving direction of the mover 2) are recessed to form recesses 14. The front and rear recesses 14 are driven upward. Projection 12 having element 11, driver 11 on top
Is movably inserted.

A U-shaped stator frame 6c is integrally provided before and after the frame 6, and the stator 3 is fixed to the stator frame 6c.

The two movers 2 (that is, the inner mover 2)
a and the outer mover 2b) are fixed to the shaft 6 by a shaft 15 (in the embodiment, a shaft 1 is provided at the center of the upper frame portion 6b).
5 is fixed on the link 1).
6 are connected to each other. The link 16 has a central hole 16a at the center and an elongated hole 16b formed on both sides parallel to the longitudinal direction of the link 16.
6 has a central hole 16a rotatably mounted on a shaft 15 fixed to the frame 6, a shaft 12a provided on a protrusion 12 having a driver 11, and a protrusion 13 having a driver 11.
Shafts 13a provided on the both sides of the link 16
6b, whereby the inner movable element 2a and the outer movable element 2b, which are in opposite phase relationship, are connected via the link 16.

The link 16 is rotatable only with respect to the shaft 15, so that when either the inner movable member 2a or the outer movable member 2b moves, the shaft 12a, the shaft 1
A link 16 connected to 3a rotates about the shaft 15, and moves the other mover 2 in the opposite direction. That is, even when a load is applied, no amplitude difference occurs between the inner mover 2a and the outer mover 2b, and a mode in which the inner mover 2a and the outer mover 2b move in the same direction can also be suppressed. It does not generate unpleasant vibration in the hand. In this case, the axis 12
a, the shaft 13a slides on the inner surface of the long hole 16b of the link 16, and absorbs the fluctuation in the distance between the shaft 12a and the shaft 13a.

As described above, in the present embodiment, the inner movable element 2a and the outer movable element 2b are set so that the reciprocating directions of the inner movable element 2a and the outer movable element 2b are reversed, and the inner movable element 2a and the outer movable element 2b that are reciprocally driven. Since the two movers 2 are connected via a link 16 that rotates about the shaft 15, the inner mover 2a and the outer mover 2b are always driven at the same frequency and opposite phases. Therefore, the vibration of the electric motor A can be reduced, and the vibration transmitted to the hand can also be reduced.

In this embodiment, as in the description based on the principle diagram of FIG. 1, the pair of leaf springs 4 constituting the support 1 are symmetrical with respect to a center line orthogonal to the vibration direction. As a result, the vertical gap fluctuation is completely eliminated, and as a result, the vertical movement of the mover 2 becomes zero, and the propulsion loss can be eliminated. When a reciprocating electric shaver is used, the vertical movement of the inner blade is eliminated, and the inner blade moves horizontally with respect to the outer blade, so that the beard can be reliably cut.

Next, another embodiment of the support 1 will be described with reference to FIG.

In the present embodiment, the support 1 is provided with a plurality of pairs of two leaf springs 4, and in the case where a plurality of pairs of the two leaf springs 4 are provided, an end of an adjacent pair is provided. The parts are connected by a connecting body 5. In each pair of two leaf springs 4, a connecting body 5 is disposed between the two leaf springs 4. In each pair, both of the two leaf springs 4 and the connecting body 5 are provided.
Are arranged in the vibration direction. In each pair, the two leaf springs 4 are symmetrical with respect to a center line L orthogonal to the vibration direction which is the moving direction.
Are connected by a connector 5 on the center line L, and the fixed end 1a of the support 1 on the mover 2 side and the fixed end 1 on the frame 6 side.
b is the same height. When the support 1 has the configuration of the embodiment shown in FIG. 8, the dimension in the direction (longitudinal direction) orthogonal to the vibration direction, which is the moving direction, can be reduced while securing the spring constant, and the motor A can be made compact. Can be

Next, another embodiment of the support 1 will be described with reference to FIG.

In the present embodiment, an example is shown in which the supporting body 1 is formed by integrally forming the connecting body 5 by bending the end of the leaf spring 4. Also in this embodiment, 2
The two leaf springs 4 are paired via a bent portion forming the connecting body 5, and the two leaf springs 4 and the bent portions forming the connecting body 5 are arranged in the vibration direction which is the moving direction. The leaf springs 4 are bilaterally symmetric with respect to a center line orthogonal to the vibration direction, and the two leaf springs 4 are connected on the center line L by a bent portion forming a connecting body 5. The fixed end 1a on the mover 2 side and the fixed end 1b on the frame 6 side have the same height. In the present embodiment, since the connecting body 5 is integrally formed by bending the end of the leaf spring 4 to form the support body 1, the connecting body 5 is not required as a separate component, and the connecting body 5 is not required. 5 can secure the rigidity of the connecting portion.

Next, still another embodiment of the support 1 will be described with reference to FIG.

In this embodiment, some or all of the pairs of the plurality of leaf springs 4 are integrally formed. FIG. 10 shows an example in which the leaf springs 4 are bent to integrally form a plurality of pairs of the leaf springs 4 (that is, an example in which all the pairs of the plurality of leaf springs 4 are integrally formed). , A plurality of leaf springs 4
May be integrally formed.
In this embodiment, the connecting body 5 is not required as a separate component, the rigidity of the joint with the connecting body 5 can be ensured, and the manufacturing is simple and the dimensional assembly accuracy is good.

[0037]

According to the first aspect of the present invention, the movable member and the stator have a non-contact structure which can be displaced only in the direction of movement but cannot be displaced in directions other than the direction of movement. In the above, the support is a pair of two leaf springs and a connecting body is arranged between the two leaf springs, and both the leaf springs and the connecting body are arranged in the vibration direction, and both the leaf springs are orthogonal to the vibration direction. Since the two leaf springs are connected by a connecting body on the center line and the fixed end on the mover side and the fixed end on the frame side of the support are at the same height,
The mover can be moved in a non-contact manner, it can move at high speed because there is no sliding part, and since there is no sliding part, it has long life and low noise. Since it is symmetrical with respect to the center line orthogonal to the vertical direction, gap fluctuations in the vertical direction can be completely eliminated, propulsion loss can be eliminated, and efficiency can be improved. When a reciprocating electric razor is constructed using a vibrating linear actuator, the vertical movement of the inner blade is eliminated and energy loss is eliminated. Thus, the cutting efficiency is improved.

According to the second aspect of the present invention, in addition to the effects of the first aspect of the present invention, the support is provided with a plurality of pairs of two leaf springs, and the end of the adjacent pair is provided. Since the parts are connected to each other, the dimension in the direction (vertical direction) perpendicular to the vibration direction can be reduced while securing the spring constant, thereby achieving compactness.

According to the third aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the connecting body is integrally formed by bending the end of the leaf spring, the connection is made. The number of parts can be reduced without requiring the body as a separate part, and the rigidity of the joint with the connecting body can be ensured.

According to the fourth aspect of the present invention, in addition to the effect of the second aspect of the present invention, since a part or all of a plurality of pairs of leaf springs are formed integrally, the connection is made. The body is not required as a separate part, the rigidity of the joint with the connecting body can be ensured, and the manufacturing is simple and the dimensional assembly accuracy is good.

[Brief description of the drawings]

FIG. 1 is a principle diagram of a vibration type linear actuator of the present invention.

FIG. 2 is a perspective view of an embodiment of the vibration linear actuator according to the present invention.

FIG. 3 is a front sectional view of the same.

FIG. 4 is a side sectional view of the same.

FIG. 5 is a front view of the same.

FIG. 6 is a side view of the same.

FIG. 7 is a plan view of the same.

FIG. 8 is an explanatory view of another embodiment of the above support.

FIG. 9 is an explanatory view of still another embodiment of the above support.

FIG. 10 is an explanatory view of still another embodiment of the above support.

[Explanation of symbols]

 A motor 1 support 2 mover 3 stator 4 leaf spring 5 connected body

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3C056 HA04 HA07 HA12 HA22 5H633 BB08 BB11 GG02 GG09 GG13 HH03 HH05 HH13 HH18 JA03 JB05

Claims (4)

[Claims] 1. A support wherein a movable member and a stator have a non-contact structure in which the movable member and the stator are displaceable only in the direction of movement but cannot be displaced in directions other than the direction of movement. A connecting body is arranged between the two leaf springs, and both the leaf springs and the connecting body are arranged in the vibration direction. The two leaf springs are symmetrical with respect to a center line orthogonal to the vibration direction. Are connected by a connecting body on a center line, and a fixed end on the mover side and a fixed end on the frame side of the support are at the same height. 2. The vibration-type linear actuator according to claim 1, wherein the support is provided by providing a plurality of pairs of two leaf springs and connecting ends of adjacent pairs. 3. The vibration-type linear actuator according to claim 1, wherein the connecting body is integrally formed by bending an end of the leaf spring. 4. The vibration-type linear actuator according to claim 2, wherein a part or all of a plurality of pairs of leaf springs are formed integrally.