JPH11285226A - Oscillation type linear actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve assembling precision by reducing the number of item parts. SOLUTION: This actuator consists of a stator 1, consisting of electromagnets or permanent magnets, a moving element 2 having permanent magnets or electromagnets, and a frame 3 which is fixed with the stator 1 and supports the moving element 2 so as to reciprocate via a leaf spring 4. Jointing members 43 for jointing to the moving element 2 are formed integrally with the leaf spring 4, using highly rigid forming material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrating linear actuator for obtaining reciprocating vibration.

[0002]

2. Description of the Related Art As a vibrating linear actuator, a stator made of an electromagnet or a permanent magnet and a stator made of an electromagnet or a permanent magnet provided with a permanent magnet or a mover provided with the electromagnet and supported reciprocally. There is something consisting of. In this linear actuator, when the movable element is supported at both ends of the movable element using a leaf spring, as shown in FIGS. 9 to 11, a fixed base 40a and a support plate are provided on the upper end of the leaf spring 4. 40b and the fixed base 40a.
Is fixed to the frame 3 by welding, so that the leaf spring 4 is fixed. Further, a coupling plate 47 is fixed to the lower end of the leaf spring 4,
The coupling plate 47 was welded to a metal portion provided on the mover 2. In the figure, reference numeral 34 denotes a connecting plate connecting the upper ends of the frame 4.

[0003]

For this reason, many parts are required for fixing the leaf spring to the frame and connecting the mover, and the assembly accuracy is increased due to the large number of parts. It was difficult. The present invention has been made in view of such a point, and an object of the present invention is to provide a vibrating linear actuator capable of performing the above-described operation.

[0004]

According to the present invention, there is provided a stator comprising an electromagnet or a permanent magnet, a movable element having a permanent magnet or an electromagnet, and a stator to which the stator is fixed and which is interposed through a leaf spring. And a frame for supporting the mover in a reciprocating manner, wherein the leaf spring is integrally formed with a coupling member for connection with the mover using a highly rigid molding material. ing.

[0005] The connecting member is formed as a convex portion that fits into a concave portion provided on the mover side, and a member welded at the fitting portion can be suitably used. In addition, the coupling member is provided with a positioning portion for positioning with the mover, and what is welded to the mover at the positioning portion can be used. Can be used which is welded to the mover at a position having a clearance between the mover and a position different from the position of the positioner.

The present invention also provides a stator comprising an electromagnet or a permanent magnet, a movable element having a permanent magnet or an electromagnet, and a reciprocating means for moving the movable element to which the stator is fixed and via a leaf spring. The leaf spring is characterized in that a support plate for fixing the frame spring to the frame is integrally formed of a highly rigid molding material. The support plate used here also serves as the fixing portion of the linear actuator.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the accompanying drawings. The illustrated linear actuator is for a reciprocating electric shaver, and includes a stator 1, a mover 2 (two movers 21 and 22 in the figure), and a frame 3. The stator 1 includes an E-shaped yoke 10 in which a sintered body of a magnetic material or an iron plate of a magnetic material is laminated,
The coil 3 is wound around a central piece of the yoke 10 and is fixed to a lower center portion of the frame 3 having a U-shaped cross section.

[0008] The two types of movers 21 and 22 are each provided with a back yoke 26 on the lower surface of driven bodies 23 and 23 made of synthetic resin.
The driven body 23 of the mover 21 is formed in a square shape in plan view, and the back yoke 26 and the permanent magnet 20 are formed on the lower surfaces of both side pieces of the driven body 23. It is provided in. The other mover 22 is disposed between both side pieces of the mover 21. As described above, the permanent magnet 20 is provided on the lower surface via the back yoke 26, and is provided on the upper surface thereof. The connecting portion 24 protrudes upward through the upper surface opening of the mover 21.

Both ends of the movers 21 and 22 are connected to the frame 3 via leaf springs 4 and 4. The leaf spring 4 here comprises a central leaf spring 41 whose lower end is connected to the mover 22, a pair of left and right leaf springs 42, 42 whose lower end is connected to the mover 21, and the upper end is a support plate. It is fixed to the frame 3 via 40. The movers 21 and 22 are suspended from the frame 3 by a leaf spring 4. In addition, the mover 21
Connecting portion 24 between spring receiving portions 26, 26 on the inner surface and mover 22
Movers 21, 22 between the spring receiving portions 27, 27
In the reciprocating direction, a pair of spring members 28, 28 composed of compression coil springs are provided.

In the linear actuator constructed as described above, the permanent magnet 20 provided on the mover 2 vertically faces the stator 1 via a predetermined gap, and moves in the reciprocating direction of the mover 2. Since it is magnetized, it depends on the direction of the current flowing through the coil 11 of the stator 1
The leaf spring 4 moves left and right while being bent. By switching the direction of the current flowing through the coil 11 at an appropriate timing, the mover 2 can perform reciprocating vibration.

Here, the arrangement of the magnetic poles of the permanent magnets 20 provided on the mover 21 and the permanent magnets 2 provided on the mover 22
Since the arrangement of the magnetic poles of 0 is reversed, both movers 2
Reciprocal vibrations of the phases 1 and 22 differ by 180 °. At this time, since the spring members 28, 28 are compressed and expanded, both the movers 21, 22 operate as a spring vibration system. In addition,
The movers 21 and 22 include a shaft 38 protruding from the frame 3.
The two movers 21 and 22 are surely vibrated in the opposite phase state because they are connected to each other via the link 39 supported by the armature.

By the way, the movers 21 and 22 are connected to the frame 3 via the leaf springs 4 as described above.
Connecting member 43 for connecting to movers 21 and 22
Is an integral molding using high-rigidity molding material (insert molding)
A support plate 40 for coupling to the frame 3 is attached to the upper end by integral molding using the same high rigidity molding material. In the figure, P indicates a resin part.

Here, the coupling member 43 has a rectangular boss 44 protruding toward the mover 2 side, and the boss 44 having a tapered portion at the tip is fitted into a recess 2 a provided in the mover 2. Positioning and fixing can be performed by welding. Since the tapered portion corresponding to the tapered portion is provided also on the inner surface side of the concave portion 2a, accurate positioning can be performed. The welding is performed on this tapered portion as shown in FIG. Since the displacement during welding is suppressed, the assembly accuracy is improved.

As shown in FIG. 6, a step may be provided at the tip of the boss 44 to provide clearance between the movable member 2 and the inner surface of the recess. The welding is performed at the tip of the boss 44 having a clearance, and the positioning is performed at the root side of the boss 44 having no clearance. In this case, the dispersion of the welding strength is reduced and stable welding can be performed. As shown in FIGS. 7 and 8, the support plate 40 integrally molded at the upper end of the leaf spring 4 using a high-rigidity molding material, as shown in FIGS.
It is fitted into a positioning recess 33 provided on the upper edge of the frame 3 and fixed by welding at this portion. Since the movable member 2 is positioned and fixed in the concave portion 33, the movable member 2 can be positioned in the vibration direction and the vertical position at a time, so that accurate assembly can be performed. The support plate 40
Is also a member connecting the upper ends of the frame 3 as a connecting plate in the above-mentioned conventional example, and has a mounting screw hole so that the linear actuator can be used for fixing to a device using the linear actuator. It has become.

[0015]

As described above, according to the present invention, a stator including an electromagnet or a permanent magnet, a movable element including a permanent magnet or an electromagnet, The frame consists of a frame that supports the mover so that it can reciprocate freely. The plate spring is integrally formed with a coupling member for connection with the mover using a highly rigid molding material, reducing the number of parts. In addition to this, the cost can be reduced, and the number of parts is reduced, so that the assembling accuracy is improved.

[0016] When the coupling member is formed as a convex portion that fits into a concave portion provided on the mover side and is welded at the fitting portion, positioning between the leaf spring and the mover is facilitated. Become. In this case, if the movable member is welded to the movable member at the positioning portion for positioning with the movable member provided on the coupling member, the positional deviation at the time of welding can be suppressed, the assembling accuracy is improved, and the movable member is movable at a position different from the positioning portion If the movable element is welded at a position where there is a clearance between the movable element and the movable element, a variation in welding strength is reduced, and stable welding can be performed.

Further, in the present invention, a stator comprising an electromagnet or a permanent magnet, a mover provided with a permanent magnet or an electromagnet, and a reciprocating means for reciprocating the mover via the leaf spring, wherein the stator is fixed and the leaf spring is used. It consists of a frame that is movably supported.Because the plate spring is integrally formed with a support plate for fixing to the frame with a highly rigid molding material,
The number of parts can be reduced and the cost can be reduced. In addition, the number of parts is reduced and the assembling accuracy is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of an example of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is an exploded perspective view of the leaf spring and the mover according to the first embodiment.

FIG. 4 is a cutaway side view of a joint between the mover and the leaf spring.

FIGS. 5 (a) and 5 (b) are cross-sectional views of a joint portion between the mover and the leaf spring according to the first embodiment.

FIGS. 6A and 6B are cross-sectional views of another example of a joint portion between the movable element and the leaf spring according to the first embodiment.

FIG. 7 is an exploded perspective view of the above plate spring and a frame.

FIG. 8 is a perspective view of a leaf spring and a frame of the above.

FIG. 9 is an exploded perspective view of a conventional frame and a leaf spring.

FIG. 10 is a perspective view of a conventional frame and a leaf spring.

FIG. 11 is an exploded perspective view of a conventional leaf spring and a mover.

[Explanation of symbols]

 1 stator 2 mover 4 leaf spring

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[Procedure amendment]

[Submission date] June 15, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

[0003]

For this reason, many parts are required for fixing the leaf spring to the frame and connecting the mover, and the number of parts increases the assembly accuracy. It was difficult. The present invention has been made in view of such a point, and its purpose is to
Reduced number of parts, high accuracy, small variation and low cost
Another object of the present invention is to provide a vibration type linear actuator.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] The two types of movers 21 and 22 are each provided with a back yoke 25 on the lower surface of driven bodies 23 and 23 made of synthetic resin.
The driven body 23 of the mover 21 has a square shape in plan view, and the back yoke 25 and the permanent magnet 20 are formed on the lower surfaces of both side pieces of the driven body 23. It is provided in. The other mover 22 is disposed between both side pieces of the mover 21. As described above, the permanent magnet 20 is provided on the lower surface via the back yoke 25, and is provided on the upper surface thereof. The connecting portion 24 protrudes upward through the upper surface opening of the mover 21.

[Procedure amendment 3]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ryo Motohashi 1048 Odomo Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (6)

[Claims] A stator comprising an electromagnet or a permanent magnet;
A mover having a permanent magnet or an electromagnet, and a frame to which the stator is fixed and which supports the mover reciprocally via a leaf spring. The leaf spring has high rigidity. A vibration-type linear actuator, wherein a coupling member for coupling to a mover is formed integrally with a molding material. 2. The vibration-type linear device according to claim 1, wherein the coupling member is formed as a convex portion that fits into a concave portion provided on the mover side, and is welded at the fitting portion. Actuator. 3. The connecting member is provided with a positioning portion for positioning with the mover, and is welded to the mover at the positioning portion.
The vibration type linear actuator as described. 4. The coupling member is provided with a positioning portion for positioning with the mover, and is welded to the mover at a position different from the positioning portion and with a clearance from the mover. 3. The method according to claim 1, wherein
The vibration type linear actuator as described. 5. A stator comprising an electromagnet or a permanent magnet,
A mover having a permanent magnet or an electromagnet, and a frame to which the stator is fixed and which supports the mover reciprocally via a leaf spring. The leaf spring has high rigidity. A vibrating linear actuator, wherein a support plate for fixing to a frame is integrally formed of a molding material. 6. The vibration type linear actuator according to claim 5, wherein the support plate also serves as a fixing portion of the linear actuator.