JP5123040B2 - Vibration type linear actuator - Google Patents

Description

  The present invention relates to a vibration type linear actuator that can be used as a drive source for a reciprocating electric shaver or the like.

  A stator, a mover, an electromagnet arranged on one of the stator and the mover, a permanent magnet arranged on the other of the two, and a plurality of movers arranged in parallel are movably supported. There is known a vibration type linear actuator that includes a supporting portion that vibrates a movable element by a current supplied to an electromagnet (see Patent Document 1).

  In the above vibration type linear actuator, for the purpose of downsizing, a plurality of movers and support portions are integrally connected by a thin elastic piece between a single support portion and a plurality of movers arranged in parallel. It is formed as a single piece made of synthetic resin. Moreover, the said support part is divided and provided in two in the reciprocating vibration direction of a needle | mover, The dimension of a height direction can be restrained by interposing a stator between two support parts.

  Here, in the vibration type linear actuator, since the electromagnet is arranged in the stator and the permanent magnet is arranged in the movable element and the plurality of movable elements are reciprocally oscillated in opposite phases, the support portion is always twisted. The gap between the permanent magnet of the mover and the electromagnet of the stator is likely to change due to the force applied. Therefore, the synthetic resin base provided on the stator and each support part must be connected to multiple screws. The gap size is stabilized by firmly connecting with.

However, such a screw fastening structure is costly. In addition, there is a problem that variations in characteristics tend to occur due to variations in tightening of a large number of screws. Furthermore, a separate screw is required to fix the vibration type linear actuator to the casing of the electric razor.
JP 2005-354879 A

  The present invention has been invented in view of the above-described conventional problems, and it is an object of the present invention to provide a low-cost vibration type linear actuator that is not limited in size and has no variation in characteristics. .

In order to solve the above problems, a vibration type linear actuator according to the present invention includes a stator, a mover, an electromagnet disposed on one of the stator and the mover, and the other of the two. And a support part that movably supports a plurality of movers arranged in parallel, and support parts respectively positioned on both sides of the mover in the reciprocating vibration direction of the stator are coupled to the stator. In the vibration type linear actuator in which the magnetic pole surface of the electromagnet and the magnetic pole surface of the permanent magnet face each other through a gap, and the movable element reciprocally vibrates by the current supplied to the electromagnet, each of the support portions includes a plurality of movable elements. The stator includes a plurality of engaged portions, and the stator includes a plurality of engaging portions in the direction in which the plurality of movable elements are arranged on both sides of the vibration direction. Engagement between the engaging part and the engaged part Is connected, further, the supporting part between the plurality of engaged portions in a direction lined with a plurality of movable elements, a particular feature incorporating a locking portion of the housing for accommodating the vibrating linear actuator Have. By engaging the plurality of engaging portions and the engaged portion, the support portion is not easily twisted without being fixed by screwing.

  If the engaging part is formed integrally with the core of the electromagnet of the stator, the support part can be reliably prevented from being twisted and the characteristics can be stabilized.

  Further, even if a bridge connecting the support portions located on both sides of the movable element in the reciprocating vibration direction of the stator is formed integrally with the support portion, torsion of the support portion is prevented and the characteristics are stabilized. It will be advantageous.

  If the cover has a cover attached to the support part and a wiring processing part for handling the lead wire connected to the winding of the electromagnet is provided on the cover, the wiring process of the lead wire can be performed by the vibration type linear actuator alone. It becomes possible.

Further, when the fixing portion is a screw hole into which a screw for fixing to the housing that houses the vibration type linear actuator is screwed, the fixing portion can be fixed to the housing with only the screw.

  In the present invention, each support portion includes a plurality of engaged portions in a direction in which a plurality of movable elements are arranged, and the stator has a plurality of engaging portions in a direction in which the plurality of movable elements are arranged on both sides of the vibration direction. Since the stator and each support part are connected by the engagement of the engaging part and the engaged part, a plurality of stators and a support part can be provided without screwing and fixing the stator and the support part. The support portion is less likely to twist due to the engagement between the engaging portion and the engaged portion, so that a stable characteristic can be obtained at a low cost with a small number of parts and a small assembly process.

  Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings. A vibration type linear actuator shown in FIGS. 1 and 2 includes a stator 1, two movable elements 2 and 2 arranged in parallel, and both movable elements. The support part 3 in which each one end side of 2 and 2 is connected through thin elastic pieces 20 and 20 and the support in which the other end side of both movable elements 2 and 2 are connected through thin elastic pieces 20 and 20 It comprises a portion 3, a spring piece 4 connecting one end of both movers 2, 2, and a spring piece 4 connecting the other end of both movers 2, 2. The two movers 2 and 2, the support portions 3 and 3, the springs 4 and 4, and the four elastic pieces 20 in total are formed as an integral body made of synthetic resin.

  The vibration type linear actuator of the illustrated example for driving a reciprocating electric razor includes drive elements 21 and 21 having inner blades for shaving mounted on the upper surface side of each mover 2. , 2 have a permanent magnet 22 and a back yoke 23 attached thereto.

  Here, each elastic piece 20 is formed so as to hang downward from both end portions of the mover 2, and the pair of support portions 3, 3 are opposed to each other below the permanent magnet 22.

  The stator 1 is an electromagnet including a metal E-shaped core 11, a coil bobbin 12, and a winding 13 wound around the outer periphery of the central piece of the core 11, and is disposed between the support portions 3 and 3. Thus, the tip magnetic pole surface of the core 11 is opposed to the permanent magnet 22 via a gap.

  When an alternating current is passed through the winding 13, the movable element 2 performs reciprocal vibration while bending the elastic piece 20. At this time, the two movable elements 2 and 2 perform reciprocal vibration in opposite phases. Thus, the magnetic poles of the permanent magnets 22 are arranged. Further, when both the movable elements 2 and 2 perform reciprocal vibrations in opposite phases, the spring pieces 4 and 4 have both the movable elements 2 and 2 as a spring vibration system, and have a frequency that matches the natural frequency. By driving the movers 2 and 2, the reciprocating vibration of the movers 2 and 2 is brought into a resonance state.

  Here, as is apparent from FIG. 1, the core 11 has a plurality of projecting portions 15 and 15 integrally projecting from both ends in the vibration direction of the movers 2 and 2 toward the support portions 3 and 3, respectively. ing. These protrusions 15 and 15 provided at intervals in the direction in which the two movers 2 and 2 are arranged are recessed groove-like engaged portions 30 and 30 provided on the lower surface side of the support portions 3 and 3. The stator 1 that is pulled into the movable elements 2 and 2 side by the magnetic attraction force acting between the core 11 and the permanent magnet 22 is the above-mentioned total 4 Positioned by the engagement of the two protrusions 15 and the engaged portions 30, 30, a gap is formed between the tip magnetic pole surface of the core 11 and the permanent magnet 22.

  In addition, since both the movers 2 and 2 are driven in opposite phases, a twisting force in a direction orthogonal to the vibration direction of the mover 2 is applied to the support portions 3 and 3. Since the plurality of projecting portions 15, 15 that are present in the direction in which they are arranged are fitted into the engaged portions 30, 30, the support portions 3, 3 are not twisted. Maintains stable dimensions.

  The screw hole 33 provided in the center of the support portion 3 in the direction in which the movable elements 2 and 2 are arranged is used to connect the vibration type linear actuator configured as described above to an electric razor as shown in FIGS. A screw hole into which a screw 60 for fixing to the housing 6 is screwed.

  3 and 4 show other examples. The basic configuration is the same as in the above embodiment, but here, the bridges 35 and 35 connecting the pair of support portions 3 and 3 that are located apart in the vibration direction of the movers 2 and 2 are integrated with the support portions 3 and 3. Provided. Due to the presence of the bridges 35 and 35, the support portions 3 and 3 have a higher resistance against the twisting force, so that more stable characteristics can be obtained.

  Another example is shown in FIGS. This is because the cover 5 for handling a lead wire (not shown) for feeding that is connected to a pair of coil terminals 14 to which the winding 13 of the stator 1 is connected is provided between the stator 1 and the support portions 3 and 3. The cover 5 made of synthetic resin is attached to the lower surface side, and has a plurality of hooks 50, 50 on its outer peripheral portion, and these hooks 50 are locked in a locking recess 36 provided in the support portion 3. The lower surface of the stator 1 and the support parts 3 and 3 is covered.

  As shown in FIG. 7, the cover 5 includes wiring processing portions 51 and 51 for hooking and handling the lead wires on the lower surface side, and screws for fixing the vibration type linear actuator to the housing 6. Holes 52 and 52 through which 60 is inserted are provided. 9 to 11 correspond to those provided with the cover 5.

  FIG. 12 shows a vibration type linear actuator not provided with the cover 5 fixed to the housing 6 with a screw 60. FIG. 13 shows a fixing hook 61 provided on the inner surface of the housing 6 inside the housing 6. The vibration type linear actuator is fixed to the housing 6 by being engaged with the upper edge of the support portion 3 fitted into the housing 6.

  As shown in FIG. 14, the casing 6 shown here surrounds the vibration type linear actuator, and is separately connected to a main body (not shown) that also serves as an electric shaver grip. A blade frame to which an outer blade for shaving is attached is connected to the upper surface side. A hole 63 shown in FIG. 11 provided on the bottom surface of the housing 6 is for inserting the lead wire.

  Although the stator 1 has an electromagnet and the mover 2 has a permanent magnet 22, the present invention can be applied even if the stator 1 has a permanent magnet and the mover 2 has an electromagnet. can do. In this case, it is preferable in terms of strength and rigidity that the protrusion 15 as the engaging portion is provided on the back yoke 23 arranged behind the permanent magnet 22 of the stator 1.

It is an exploded perspective view of an example of an embodiment of the invention. It is a perspective view same as the above. It is a disassembled perspective view of another example. It is a perspective view same as the above. It is a perspective view of another example. It is an exploded perspective view same as the above. It is a bottom view same as the above. It is a front view same as the above. It is a longitudinal cross-sectional view of the state fixed to the housing | casing. It is a cross-sectional view same as the above. It is a bottom view same as the above. It is a longitudinal cross-sectional view of another example. It is a cross-sectional view of another example. It is a perspective view same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stator 2 Movable element 3 Support part 4 Spring piece 5 Cover 6 Case 11 Core 13 Winding 15 Protrusion 22 Permanent magnet 30 Engaged part

Claims (5)

A stator, a mover, an electromagnet arranged on one of the stator and the mover, a permanent magnet arranged on the other of the two, and a plurality of movers arranged in parallel are movably supported. And supporting portions positioned on both sides of the stator in the reciprocating vibration direction of the mover are coupled to the stator, and the magnetic pole surface of the electromagnet and the magnetic pole surface of the permanent magnet are interposed via a gap. It is a vibration type linear actuator that opposes and the mover reciprocally vibrates by the current supplied to the electromagnet,
Each of the support portions includes a plurality of engaged portions in a direction in which a plurality of movers are arranged, and the stator includes a plurality of engagement portions in a direction in which the plurality of movers are arranged on both sides of the vibration direction. And the stator and each support part are connected by the engagement of the engaging part and the engaged part ,
Further, the support portion includes a fixing portion for a housing that houses the vibration type linear actuator between a plurality of engaged portions in a direction in which a plurality of movers are arranged. Vibration type linear actuator.   2. The vibration type linear actuator according to claim 1, wherein the engaging portion is formed integrally with a core of an electromagnet provided on the stator.   3. The vibration type linear actuator according to claim 1, wherein bridges connecting the support portions respectively positioned on both sides of the stator in the reciprocating vibration direction of the stator are formed integrally with the support portions.   The wiring processing part for the handling of the lead wire connected to the winding of an electromagnet is provided in the cover with the cover attached to a support part, The any one of Claims 1-3 characterized by the above-mentioned. The vibration type linear actuator described in the item. The fixed part of the support portion, the vibration type according to claim 1, wherein the vibrating linear fixing screws of the actuator to the housing for accommodating a is a screw hole to be screwed Linear actuator.

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