WO2010035728A1 - Electric shaver, and electromagnetic actuator - Google Patents

Abstract

Disclosed is an electromagnetic actuator (15) for an electric shaver, which comprises: movable elements (32a and 32b) made reciprocally movable in reciprocating directions (X); and a stator (31) including a stator core (33) having plural salient poles (33a to 33c) arrayed in the reciprocating directions, and a coil (34) wound on at least one of the salient poles.  The magnetic path of a boundary portion between the movable elements and the stator is shifted in directions (Y) orthogonal to the reciprocating directions in at least one of the salient poles.  As a result, the electromagnetic actuator periodically generates driving forces for driving the movable elements in the orthogonal directions while generating driving forces for reciprocating the movable elements in the reciprocating directions.

Description

Electric razor and electromagnetic actuator

The present invention relates to an electric razor, and more particularly, to a reciprocating electromagnetic actuator for an electric razor.

An electric razor using a reciprocating electromagnetic actuator is proposed in Patent Document 1, for example. The reciprocating electromagnetic actuator is disposed in the head portion of the electric razor. The reciprocating electromagnetic actuator includes a stator fixed in the head portion of the electric razor and a mover supported so as to reciprocate in the head portion of the electric razor. The stator is, for example, an electromagnet, and has a mover, such as a permanent magnet. The mover supports the inner blade. The inner blade is covered with a mesh-shaped outer blade mounted on the head portion. The mover reciprocates (linear drive) by energizing the stator. Body hair such as a heel is introduced into the head part through the stitches of the outer blade, and is shaved with the outer blade and the inner blade.

JP-A-7-265560

Since the heel grows in various directions, the user who wants to shave has to move the electric razor in various directions on the skin to introduce the heel into the stitches of the outer blade.
An object of the present invention is to provide an electric razor and an electromagnetic actuator that can improve the shaving performance and improve the shaving performance.

One aspect includes a head portion that is tiltably connected to a gripping portion, an inner blade that is reciprocally provided in the head portion, and an outer blade that is provided on the head portion so as to cover the inner blade And an electric razor including an electromagnetic actuator for reciprocating the inner blade. The electromagnetic actuator is configured to support the inner blade and move the inner blade back and forth in the reciprocating direction, a stator core including a plurality of salient poles arranged side by side in the reciprocating direction, And a stator including a coil wound around at least one of the salient poles. In the electromagnetic actuator, a magnetic path at a boundary between the movable element and the stator is shifted in a direction orthogonal to the reciprocating direction in at least one of the plurality of salient poles. While generating the driving force for reciprocating the child in the reciprocating direction, the driving force for driving the movable element in the orthogonal direction is generated periodically.

According to this configuration, the inner blade reciprocates with the reciprocating movement of the mover, so that the inner blade and the outer blade are cut off the wrinkles and the like, and the direction orthogonal to the reciprocating direction acting on the mover It is possible to periodically reciprocate the head part through the movable element with the driving force, and this is the same as changing the shaving direction of the electric razor. It becomes easy to be introduced into the outer blade, the introduction rate is increased, and the shaving performance is improved.

In one example, at least one of the leading end surface of each salient pole and the magnetic action portion of the mover facing the leading end surface is provided with a convex portion for shifting the magnetic path. Alternatively, the shaving performance can be improved with an easy response by simply providing a convex portion on the mover.

In one example, the convex portion is a separate member from the stator core.
According to this configuration, it is possible to improve shaving performance by adding a convex portion to an existing stator or movable element that does not have a convex portion. Further, the convex portion where the magnetic flux is concentrated can be constituted by, for example, compression molding of magnetic metal powder capable of reducing eddy current loss, or can be constituted by laminating a plurality of core materials made of magnetic metal.

In one example, the plurality of salient poles are three salient poles including two end-side salient poles positioned at both ends in the reciprocating direction and a central salient pole positioned in the center in the reciprocating direction, The magnetic paths of the two end salient poles are shifted to one side in the orthogonal direction, and the magnetic paths of the central salient poles are shifted to the other side in the orthogonal direction.

According to this configuration, the shift amount of the magnetic path at the boundary between the mover and the stator can be increased within a limited range, and the force in the direction perpendicular to the reciprocating direction received by the mover can be efficiently generated. It becomes possible.

In one example, the magnetic action portion of the mover facing the tip surface of each salient pole includes a permanent magnet.
According to this configuration, even if the amount of magnetic flux (current) generated on the stator side is suppressed, a desired driving force can be obtained by the permanent magnet included in the magnetic action portion of the mover.

In one example, the number of the stators is one, the number of the movable elements is two, the two movable elements each include a magnetic action unit including permanent magnets arranged in opposite polarities, and the two movable elements are Reciprocated in opposite phase.

According to this configuration, it is possible to efficiently generate a force in a direction orthogonal to the reciprocating direction received by the mover in synergy with the reciprocal movement of the two movers in opposite phases.
In one example, the two magnetic paths formed at the boundary between the two movers and the stator are shifted so as to be line symmetric with respect to the two movers.

According to this configuration, the force in the direction orthogonal to the reciprocating direction received by the mover can be efficiently generated in synergy with the reciprocal movement of the two movers in opposite phases.
In one example, a spring member for resonating the mover is further provided.

According to this configuration, even if the amount of magnetic flux (current) generated on the stator side is suppressed, a desired driving force can be obtained by the spring member that resonates the mover.
In one example, the stator core is a compression molded body of magnetic metal powder.

According to this configuration, an eddy current loss can be suppressed sufficiently small, and an electromagnetic actuator excellent in magnetic efficiency can be configured. Further, since the stator core can be molded, the degree of freedom of the shape of the stator core is high.

In one example, the stator core is a laminate of a plurality of core layers made of a magnetic metal.
According to this configuration, an eddy current loss can be suppressed sufficiently small, and an electromagnetic actuator excellent in magnetic efficiency can be configured. Further, since the core layer can be formed by pressing the metal plate, it can contribute to cost reduction of the stator core.

In another aspect, at least one of the movable element capable of reciprocating in the reciprocating direction, the stator core including a plurality of salient poles arranged side by side in the reciprocating direction, and the plurality of salient poles. An electromagnetic actuator comprising a stator including a wound coil is provided. In the electromagnetic actuator, a magnetic path at a boundary portion between the movable element and the stator is shifted in a direction orthogonal to the reciprocating direction in at least one of the plurality of salient poles. The driving force for driving the movable element in the orthogonal direction is periodically generated while generating the driving force for reciprocating in the reciprocating direction.

An electromagnetic actuator having this configuration is preferably used as a drive source for an electric razor.

It is a perspective view of the electric razor of one Embodiment. (A) is a perspective view of an electromagnetic actuator, (b) is a top view for demonstrating the overlap of a stator and a needle | mover. It is a top view of the stator (stator core) of a modification. It is a top view of a needle | mover. It is a perspective view which shows the more concrete structure of an electromagnetic actuator. (A) is a perspective view which shows the more concrete structure of a needle | mover (magnetic action part), (b) (c) is a perspective view which shows the modification.

Hereinafter, an electric shaver according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the electric razor 11 of this embodiment includes a grip portion 12 that can be gripped by a user, and a head portion 13 connected to the upper portion of the grip portion 12. The head unit 13 can tilt with two degrees of freedom, for example. The head unit 13 includes a plurality of blade blocks 14a to 14c and an electromagnetic actuator 15. An operation switch 16 is provided on the outer surface of the grip portion 12. A battery and a drive circuit (both not shown) are provided inside the grip portion 12. The electromagnetic actuator 15 is supplied with a drive current (alternating current) generated by the drive circuit based on an ON operation of the operation switch 16 of the grip portion 12.

A pair of knitted blade blocks 14a and 14b and a slit blade block 14c are arranged on the upper portion of the head portion 13. The knitted blade blocks 14a and 14b include inner blades 22a and 22b and mesh-shaped outer blades 21a and 21b that cover the inner blades 22a and 22b, respectively. The slit blade block 14c is disposed between the stitch blade blocks 14a and 14b. The slit blade block 14c includes a slit outer blade 21c and an inner blade (not shown). These blade blocks 14a to 14c are arranged side by side in a direction (Y in FIG. 1) perpendicular to the longitudinal direction (X in FIG. 1) of the blade blocks 14a, 14b, and 14c, and are arranged on the top of the head portion 13. . That is, the illustrated electric razor 11 is a so-called three-blade type.

The outer blades 21 a to 21 c of the blade blocks 14 a to 14 c are integrated as an outer blade cassette 23. The outer blade cassette 23 can be attached to and detached from the upper portion of the head housing 24. The inner blades 22 a and 22 b can reciprocate at the top of the head portion 13. The inner blades 22a and 22b are preferably urged so as to press the inner surfaces of the mesh outer blades 21a and 21b, respectively. The inner blades 22a and 22b are reciprocated in the outer blades 21a and 21b by driving the electromagnetic actuator 15 (see arrow X in FIG. 1). In the following description, “reciprocating direction X” refers to the direction of reciprocating movement of the inner blades 22 a and 22 b, and “orthogonal direction Y” refers to the direction orthogonal to the reciprocating direction X.

The inner blade (not shown) of the slit blade block 14c is drivingly connected to a mover (for example, member number 32a in FIG. 2) that drives one inner blade (for example, the inner blade 22a) of the blade blocks 14a and 14b. It may be interlocked with one inner blade.

As shown in FIG. 2A, the electromagnetic actuator 15 includes one stator 31 and movers 32a and 32b corresponding to the inner blades 22a and 22b, respectively. The stator 31 is fixed in the head housing 24. The movers 32a and 32b are movable in the reciprocating direction X. The movers 32 a and 32 b may be supported by the head housing 24.

The stator 31 includes a stator core 33 including a plurality of salient poles 33a to 33c, and a coil 34. The plurality of salient poles 33a to 33c are arranged side by side in the reciprocating direction X. In the illustrated example, the stator core 33 is E-shaped and includes three salient poles 33a to 33c. The salient poles 33a and 33c may be called end salient poles, and the salient pole 33b may be called central salient poles. The lower ends of the plurality of salient poles 33a to 33c are connected to each other, and the tips of the salient poles 33a to 33c face upward. A coil 34 is wound around a salient pole 33b located in the center.

Each of the salient poles 33a to 33c of the stator core 33 has a rectangular column shape having an elongated rectangular cross section, the short side of the cross section extends in the reciprocating direction X, and the long side of the cross section extends in the orthogonal direction Y. ing. As shown in FIG. 2 (b), by the central bisector L1 extending in the reciprocating direction X, the tip side of the salient poles 33a to 33c is a region A1 for driving the movable element 32a and a region A2 for driving the movable element 32b. It is divided into and.

In the region A1, a pair of convex portions 33x are provided on the tip surfaces of the salient poles 33a to 33c. A gap having a width corresponding to one of the convex portions 33x is provided between the pair of convex portions 33x. Each convex portion 33x has a rectangular column shape having an elongated rectangular cross section, the long side of the cross section extends in the reciprocating direction X, and the short side of the cross section extends in the orthogonal direction Y. In the illustrated example, for each of the salient poles 33a and 33c arranged at both ends, the outer convex portion 33x located farther from the central bisector L1 continues to the outer edge in the orthogonal direction Y of the salient pole. (Ie, without a gap from the outer edge). On the other hand, with respect to the central salient pole 33b, the outer convex portion 33x located farther from the central bisector L1 is shifted inward by one width of the convex portion 33x from the outer edge in the orthogonal direction Y of the salient pole. It is provided at a position (that is, a position close to the central bisector L1). In the illustrated example, the projecting portion 33x of the salient pole 33a and the projecting portion 33x of the salient pole 33c are aligned with each other along the reciprocating direction X, but the projecting portion 33x on the tip surface of the center salient pole 33b is projected at both ends. Each of the poles 33a and 33c is shifted inward from the convex portion 33x by one width of the convex portion 33x.

The region A2 is line symmetric with the region A1 with respect to the central bisector L1. Therefore, each of the salient poles 33a and 33c at both ends of the region A2 has an outer convex portion 33x continuous to the outer edge in the orthogonal direction Y of the salient pole and an inner side with a gap corresponding to one width of the convex portion 33x. And an inner convex portion 33x. The center salient pole 33b includes an outer convex portion 33x provided at a position shifted inward by one width of the convex portion 33x from the outer edge in the orthogonal direction Y of the salient pole, and one width of the convex portion 33x. And an inner convex portion 33x provided on the inner side with a gap.

The stator core 33 may be a laminate of a plurality of core layers 33y made of a magnetic metal such as SPCC (cold rolled steel plate) as shown in FIG. The stator core 33 may be a compression molded body of magnetic metal powder. The stator core 33 may be configured by cutting a magnetic metal block.

In the example of FIG. 2, a pair of convex portions 33x is provided in each of the regions A1 and A2 on the tip surfaces of the salient poles 33a to 33c. Instead, as shown in FIG. 3, one convex portion 33x may be provided in each of the regions A1 and A2. As in the example of FIG. 2, the convex portions 33x of the salient poles 33a and 33c at both ends in the example of FIG. 3 are provided at the outer edge portion in the orthogonal direction Y, whereas the convex portion 33x of the central salient pole 33b is the outer edge portion. Is provided at a position displaced inward by a predetermined amount.

Next, the operation of the stator 31 will be described. While an alternating current for driving is supplied from a drive circuit (not shown) to the coil 34 wound around the central salient pole 33b, the polarity of the tip of the salient pole 33b changes periodically. On the other hand, the polarities of the tips of the salient poles 33a and 33c at both ends periodically change with a phase opposite to that of the central salient pole 33b. In this way, the salient poles 33a to 33c generate an alternating magnetic field. The magnetic flux between the salient poles 33a to 33c and the movers 32a and 32b intensively passes through the convex portion 33x.

Next, the movers 32a and 32b will be described.
The movers 32a and 32b are associated with the areas A1 and A2 of the stator 31, respectively. The movable elements 32a and 32b are provided with magnetic action portions 35a and 35b facing the tip surfaces of the salient poles 33a to 33c of the stator 31, respectively. The stator 31 (particularly the salient poles 33a to 33c) and the movers 32a and 32b (particularly the magnetic action portions 35a and 35b) form a magnetic path. The reciprocating motion of the movers 32a and 32b is obtained by an alternating magnetic field generated by the stator 31.

The dimensions of the magnetic action portions 35a and 35b will be described. In the following description, the reciprocating direction X may be referred to as the longitudinal direction. The orthogonal direction Y may be referred to as the width direction. As shown in FIG. 2B, the dimension (length) of the magnetic action portions 35a and 35b in the reciprocating direction X extends over the salient poles 33a to 33c of the stator core 33, but the stator core in the reciprocating direction X. It is slightly shorter than the dimension (length) of 33. The dimension (width) of the magnetic acting portions 35a and 35b in the orthogonal direction Y is the dimension of the formation region of the pair of convex portions 33x in the orthogonal direction Y (that is, between the width of the two convex portions 33x and the convex portion 33x). The sum of the gap distance). Each of the magnetic acting portions 35a and 35b includes a rectangular plate-shaped base portion 35y and convex portions 35x provided at both ends in the width direction of the lower surface of the base portion 35y. The width of each convex portion 35 x is the same as that of the convex portion 33 x of the stator core 33. The length of each convex part 35x is the same as the length of the base part 35y. Between each convex part 35x of magnetic action part 35a, 35b, the gap | interval of the width | variety for one convex part 35x is provided. In FIG. 2B, in each of the regions A1 and A2, the centers of the convex portions 33x outside the salient poles 33a and 33c of the stator core 33 and the convex portions 33x inside the central salient pole 33b are centered. A center line L2 is shown through. The movers 32a and 32b are arranged so that the center points in the width direction of the magnetic action portions 35a and 35b are located on the center line L2. The inner blades 22a and 22b are detachably connected to the movers 32a and 32b.

With reference to FIG. 6, the magnetic structure of the magnetic action parts 35a and 35b will be described.
In the example shown in FIG. 6A, the base portion 35y is made of a magnetic metal and functions as a back yoke. The convex portion 35 x is constituted by a permanent magnet 36. The permanent magnet 36 has a magnetic pole boundary in the center of the reciprocating direction X, and has different magnetic poles on both sides of the boundary. The permanent magnets 36 of the movers 32a and 32b are arranged with the same polarity. On the other hand, the permanent magnet 36 of the mover 32a and the permanent magnet 36 of the mover 32b are arranged with opposite polarities.

6B, the base portions 35y of the magnetic action portions 35a and 35b are constituted by permanent magnets 36. The convex portion 35x is made of a magnetic metal. In the example of FIG. 6C, the base portions 35 y and the convex portions 35 x of the magnetic action portions 35 a and 35 b are both constituted by permanent magnets 36. 6B and 6C, the permanent magnets 36 of the movers 32a and 32b are arranged with opposite polarities.

As shown in FIG. 4, the spring member 37a may be connected to both ends of the movable elements 32a and 32b in the reciprocating direction X, and the spring member 37b may be connected to both ends of the movable elements 32a and 32b in the orthogonal direction Y. . When the spring constant of the spring member 37a is set to a value that resonates with the reciprocation of the movers 32a and 32b, the driving force for reciprocating the movers 32a and 32b can be reduced. Instead of the movers 32a and 32b, spring members 37a and 27b may be coupled to the magnetic action portions 35a and 35b.

The operation of the electromagnetic actuator 15 will be described. As shown in FIG. 2, when an alternating current flows through the coil 34 of the stator 31, the polarity of the tip of the central salient pole 33b and the polarity of the tip of the salient poles 33a, 33c are periodically reversed in phase. Change. The magnetic field change accompanying the change in polarity acts on the magnetic action portions 35a and 35b of the movers 32a and 32b, whereby the movers 32a and 32b reciprocate. Since the permanent magnets 36 of the movers 32a and 32b are arranged with opposite polarities, the movers 32a and 32b reciprocate in opposite phases, and the inner blades 22a and 22b reciprocate. The heel introduced into the stitches of the outer blades 21a and 21b is sandwiched and cut between the inner blades 22a and 22b and the outer blades 21a and 21b, and the heel is shaved off. Incidentally, the scissors introduced into the slit-shaped outer blade 21c are shaved off by the reciprocating motion of the inner blade (not shown) interlocked with the mover 32a or 32b.

Because of the positional relationship between the projections 33x provided on the salient poles 33a to 33c of the stator 31 (stator core 33) and the projections 35x (permanent magnets 36) of the magnetic action portions 35a and 35b of the movers 32a and 32b. Arc-shaped driving forces F1 and F2 (see FIG. 2B) act on the movers 32a and 32b, respectively. Each arcuate driving force F1, F2 has a driving force in the reciprocating direction X (also referred to as a reciprocating direction component) and a driving force in the orthogonal direction Y (also referred to as an orthogonal direction component). The arcuate driving forces F1 and F2 are directed outward in the orthogonal direction Y from the central salient pole 33b of the stator 31 toward the salient poles 33a and 33c at both ends. The movable elements 32a and 32b ( inner blades 22a and 22b) reciprocate in opposite phases by the reciprocating direction components of the driving forces F1 and F2, and the movable elements 32a and 32b (inner blade 22a) by the orthogonal components of the driving forces F1 and F2. , 22b) are biased in the opposite direction in the orthogonal direction Y. The reciprocating motion of the movable elements 32a and 32b by the driving forces F1 and F2 having orthogonal direction components causes the head portion 13 to move minutely around an axis perpendicular to the XY plane and passing through the center point of the outer blades 21a to 21c. Periodically reciprocates within an angular range. The reciprocating rotation of the head portion 13 has the same effect as changing the shaving direction of the electric razor 11 in various ways. The wrinkles or the like facing in various directions are easily introduced into the stitches of the outer blades 21a to 21c, the introduction rate is increased, and the shaving performance of the electric shaver 11 is improved.

Next, characteristic effects of the present embodiment will be described.
(1) In the present embodiment, the convex portions 33x of the salient poles 33a to 33c constituting the magnetic path at the boundary between the movers 32a and 32b and the stator 31 are provided so as to be shifted in the direction orthogonal to the reciprocating direction. ing. Thereby, the electromagnetic actuator 15 of the electric razor 11 generates driving forces F1 and F2 each having a driving force in the reciprocating direction and a periodic driving force in the orthogonal direction to reciprocate the movers 32a and 32b. . Thereby, a wrinkle etc. can be cut | disconnected with the inner blades 22a and 22b and the outer blades 21a and 21b. Further, the head unit 13 periodically reciprocates by the driving force in the orthogonal direction transmitted to the head unit 13 through the movers 32a and 32b. Since this rotation has the same effect as changing the shaving direction of the electric razor 11, it is easy to introduce wrinkles or the like facing in various directions into the outer blades 21 a and 21 b, and the introduction rate is high. Therefore, the shaving performance can be improved.

(2) In the present embodiment, the magnetic path can be shifted by the convex portion 33x provided on the tip surface of the salient poles 33a to 33c of the stator 31. The shaving performance can be improved by an easy structural change by simply providing the convex portion 33x on the conventional stator.

(3) In the present embodiment, the plurality of salient poles of the stator 31 include two end salient poles 33a and 33c located at both ends of the reciprocating direction X, and a central salient located at the center in the reciprocating direction X. There are three salient poles comprising the pole 33b. The magnetic paths of the two end-side salient poles 33a and 33c are shifted to one side in the orthogonal direction Y, and the magnetic path of the central salient pole 33b is offset to the other side in the orthogonal direction Y. Therefore, the shift amount of the magnetic path at the boundary between the movers 32a and 32b and the stator 31 can be increased within a limited range, and the force in the direction orthogonal to the reciprocating direction received by the movers 32a and 32b can be generated efficiently. Can be made.

(4) In this embodiment, since the permanent magnet 36 is used for the magnetic action portions 35a and 35b of the movers 32a and 32b, a desired driving force can be obtained even if the amount of magnetic flux (current) generated by the stator 31 is suppressed. F1 and F2 can be obtained. This configuration contributes to suppression of power consumption.

(5) In this embodiment, two movers 32 a and 32 b are provided for one stator 31, the permanent magnets 36 of the movers 32 a and 32 b are arranged with opposite polarities, and the movers 32 a and 32 b are Reciprocates in opposite phase. In such movers 32a and 32b, in the present embodiment, the convex portions 33x of the salient poles 33a to 33c are even line-symmetric between the regions A1 and A2 corresponding to the movers 32a and 32b, respectively. By synergistically reciprocating the opposite phases of the pair of movers 32a and 32b, the force in the orthogonal direction received by the movers 32a and 32b can be efficiently generated.

(6) In this embodiment, by providing the spring member 37a that resonates the movers 32a and 32b, a desired driving force can be obtained even if the amount of magnetic flux (current) generated by the stator 31 is suppressed.

(7) By configuring the stator core 33 of the present embodiment with a laminated body of the core layer 33y made of magnetic metal, the eddy current loss can be suppressed sufficiently small, and the electromagnetic actuator 15 having excellent magnetic efficiency is configured. can do. In addition, since each core layer 33y can be formed by pressing a metal plate, the stator core 33 having this configuration can contribute to cost reduction. Further, if the stator core 33 is configured by compression molding of magnetic metal powder, eddy current loss can be suppressed sufficiently small, and the electromagnetic actuator 15 having excellent magnetic efficiency can be configured. The configured stator core 33 has a high degree of freedom in its shape.

(8) The convex portion 33x formed on the salient poles 33a and 33c at both ends in the reciprocating direction X and the convex portion 33x formed on the salient pole 33b at the intermediate position in the reciprocating direction X are controlled amounts. Shifted in the orthogonal direction Y. In particular, the convex portions 33x formed on the salient poles 33a and 33c at both ends are shifted outward in the orthogonal direction Y from the convex portion 33x formed on the salient pole 33b at the intermediate position. By this shift, orthogonal components having opposite phases are applied to the driving forces F1 and F2, and the rotational moment acting on the head portion 13 increases. Therefore, the shaving performance of the electric razor 11 is improved.

In addition, you may change embodiment of this invention as follows.
In the above embodiment, the convex portion 33x and the stator core 33 (the salient poles 33a to 33c) are integrally formed. However, the convex portion 33x may be a separate member from the stator core 33, and may be joined or bonded. Thus, the convex portion 33x may be fixed to the stator core 33. According to this structure, the effect of this invention can be acquired by the change of adding the convex part 33x to the conventional stator. Moreover, the convex part 33x can also be produced by a technique different from the technique for producing the stator core 33. For example, the convex portion 33x where the magnetic flux concentrates can be configured by compression molding of magnetic metal powder that can reduce eddy current loss, for example.

In the above embodiment, the convex portion 33x of the tip surface of the salient poles 33a to 33c of the stator 31 (stator core 33) is shifted in the orthogonal direction Y. However, the magnetic action portions 35a and 35b of the movers 32a and 32b The convex portion 35x may be shifted in the orthogonal direction Y. In this case, the convex portions 35x in which the magnetic acting portions 35a and 35b are shifted function as convex portions that shift the magnetic path at the boundary between the mover and the stator. Or you may shift both the convex part 33x of the stator 31, and the convex part 35x of the needle | mover 32a, 32b.

In the above embodiment, the convex portions 33x of the salient poles 33a and 33c located at both ends are shifted to one side in the orthogonal direction Y, and the convex portion 33x of the salient pole 33c located in the center is shifted to the other side in the orthogonal direction Y. However, the present invention is not limited to this, and a mode in which the convex portion 33x of at least one of the salient poles 33a to 33c is shifted may be employed.

In the above embodiment, the convex portion 33x is provided on the tip surface of the salient poles 33a to 33c so as to shift the magnetic path at the boundary between the movers 32a and 32b and the stator 31 in the orthogonal direction Y. The part 33x may be eliminated, and the salient poles 33a to 33c themselves may be shifted in the orthogonal direction Y. In this case, the tip surfaces of the salient poles 33a to 33c function as convex portions that shift the magnetic path at the boundary between the mover and the stator.

In the above embodiment, the permanent magnet 36 is used for the magnetic action portions 35a and 35b of the movers 32a and 32b. However, the present invention may be applied to a so-called reluctance type electromagnetic actuator using a magnetic metal that does not use the permanent magnet 36. . In this case, the magnetic action portions 35a and 35b are manufactured by a laminated body of core layers made of magnetic metal, magnetic metal powder molding, magnetic metal block cutting, or the like. In the magnetic action portions 35a and 35b, reluctance convex portions may be provided in the reciprocating direction X at predetermined intervals.

In the embodiment described above, the stator 31 is configured by winding the coil 34 around the center salient pole 33b. However, the coil 34 may be wound around the salient poles 33a and 33c at both ends.
In the above embodiment, the pair of movers 32a and 32b is driven by one stator 31, but a plurality of stators corresponding to the respective movers 32a and 32b may be used.

In the above embodiment, the electric razor 11 is a so-called three-blade type having three outer blades 21a to 21c. However, the electric razor 11 is a single-blade, two-blade, four-blade or more. There may be.

DESCRIPTION OF SYMBOLS 11 ... Electric razor, 12 ... Holding part, 13 ... Head part, 15 ... Electromagnetic actuator, 21a, 21b ... Outer blade, 22a, 22b ... Inner blade, 31 ... Stator, 32a, 32b ... Movable element, 33 ... Stator Core, 33a to 33c ... salient pole, 33x ... convex part (magnetic path), 33y ... core layer, 34 ... coil, 35a, 35b ... magnetic action part, 36 ... permanent magnet, 37a ... spring member, F1, F2 ... drive Power.

Claims (11)

1. A head unit that is tiltably coupled to the gripping unit;
   A reciprocating inner blade provided in the head portion;
   An outer blade provided on the head portion so as to cover the inner blade;
   An electromagnetic actuator for reciprocating the inner blade,
   A mover that supports the inner blade and allows the inner blade to reciprocate in a reciprocating direction;
   The electromagnetic actuator comprising: a stator core including a plurality of salient poles arranged side by side in the reciprocating direction; and a stator including a coil wound around at least one of the plurality of salient poles; ,
   An electric razor comprising:
   The electromagnetic actuator is
   A magnetic path at a boundary between the mover and the stator is shifted in a direction orthogonal to the reciprocating direction in at least one of the plurality of salient poles, thereby moving the mover to the reciprocating motion. An electric shaver configured to periodically generate a driving force for driving the movable element in the orthogonal direction while generating a driving force that reciprocates in a direction.
2. 2. An electric shaver according to claim 1, wherein at least one of the tip surface of each salient pole and the magnetic action portion of the mover facing the tip surface is provided with a convex portion for shifting the magnetic path.
3. The electric razor according to claim 2, wherein the convex portion is a separate member from the stator core.
4. The plurality of salient poles are three salient poles each composed of two end-side salient poles located at both ends in the reciprocating direction and a central salient pole located in the center in the reciprocating direction,
   The electric razor according to claim 1, wherein the magnetic paths of the two end-side salient poles are shifted to one side in the orthogonal direction, and the magnetic path of the central salient pole is offset to the other side in the orthogonal direction.
5. The electric razor according to claim 1, wherein the magnetic action portion of the mover facing the tip surface of each salient pole includes a permanent magnet.
6. The number of the movable elements is one, the number of the movable elements is two, the two movable elements each include a magnetic action unit including permanent magnets arranged in opposite polarities, and the two movable elements are in opposite phases. The electric shaver according to claim 5, which is reciprocated.
7. The electric razor according to claim 6, wherein two magnetic paths respectively formed at a boundary portion between the two movers and the stator are shifted so as to be line symmetric with respect to the two movers.
8. The electric shaver according to claim 1, further comprising a spring member for resonating the movable element.
9. 2. The electric shaver according to claim 1, wherein the stator core is a compression molded body of magnetic metal powder.
10. The electric shaver according to claim 1, wherein the stator core is a laminate of a plurality of core layers made of a magnetic metal.
11. A mover capable of reciprocating in the reciprocating direction;
    A stator core including a plurality of salient poles arranged side by side in the reciprocating direction and a coil wound around at least one of the plurality of salient poles;
    An electromagnetic actuator comprising:
    A magnetic path at a boundary between the mover and the stator is shifted in a direction orthogonal to the reciprocating direction in at least one of the plurality of salient poles, thereby moving the mover to the reciprocating motion. An electromagnetic actuator configured to periodically generate a driving force for driving the mover in the orthogonal direction while generating a driving force that reciprocates in a direction.

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