JP2601240Y2 - Vibration actuator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration actuator, and more particularly to a moving magnet type vibration actuator suitable for a drive source of a vibration canceller actuator.

[0002]

2. Description of the Related Art A moving coil type vibration actuator is disclosed in Japanese Utility Model Laid-Open Publication No. 1-171578. FIG. 2 is a configuration diagram showing the configuration of the vibration actuator described in Japanese Utility Model Laid-Open No. 1-171578. In FIG. 2, reference numeral 1 denotes a hollow cylindrical side yoke, and reference numeral 2 denotes a hollow cylindrical center yoke in which an outer cylindrical surface is disposed at a constant interval with respect to an inner wall surface of the side yoke.

[0003] On the inner wall surface of the side yoke 1, first and second coils 3 and 4 are provided at predetermined intervals. Further, a third coil 5 facing the first coil 3 and a fourth coil 6 facing the second coil 4 are provided on the outer cylinder surface of the center yoke.

The mover 8 is supported in a space between the inner cylindrical surface of the side yoke 1 and the outer cylindrical surface of the center yoke 2 so as to be movable in the axial direction, and is made of a nonmagnetic material.
In the cylindrical portion of the mover 8 between the first coil 3 and the third coil 5, a first magnet 9 substantially constituting the cylindrical surface of the mover 8 is provided with a second coil 4. The cylindrical portion of the mover 8 between the first magnet 9 and the fourth coil 6 substantially constitutes the cylindrical surface of the mover 8, and the second magnet whose magnetization direction is opposite to that of the first magnet 9. 10 are provided.

In FIG. 2, as indicated by the broken line, the first coil 3 → the first magnet 9 → the third coil 5 →
Center yoke 2 → fourth coil 6 → second magnet 10 →
A magnetic circuit having a magnetic flux flowing through the second coil 4 → the side yoke 1 is formed.

Next, the operation of the above configuration will be described. The first coil 3 and the second coil 3 have a magnetic polarity as shown in FIG.
When a current flows through the coil 4, the third coil 5, and the fourth coil 6, thrust is generated in the first to fourth coils 3 to 6 according to Fleming's left-hand rule. Here, the side yoke 1
Since the center yoke 2 and the center yoke 2 are fixed, the mover 8 moves in the directions of arrows A and B due to the reaction of the thrust.

[0007]

However, the vibration actuator having the above configuration has the following problems. (1) There are two magnetic gaps in the magnetic circuit, the gap length of the magnetic gap is large, and the first and second magnets 9 and 10 are disposed with respect to the side yoke 1 and the center yoke 2 via a space. Therefore, the magnetic resistance is large and the loss is large. 2 Further, since the first and second magnets 9 and 10 are attached to the grooves formed in the cylindrical surface of the mover 8, the manufacturing is difficult. (3) Since only one magnetic circuit is formed, it is difficult to reduce the thickness of the mover in the moving direction in order to generate a predetermined power. 4 Further, since it is difficult to reduce the thickness of the mover in the moving direction, the length of the mover in the moving direction is increased, and the structure for supporting the mover is complicated.

In the above-described vibration actuator, the vibration is taken out from the mover via a fixed shaft or the like. However, in a vibration canceller actuator or the like that cancels vibration of a heavy object, it is necessary to adopt a configuration in which vibration is extracted from the entire housing.

A vibration actuator for vibrating the entire housing is disclosed in Japanese Utility Model Laid-Open No. 5-28464. FIG.
FIG. 1 is a configuration diagram illustrating a configuration of a vibration actuator described in Japanese Patent Application Laid-Open Publication No. H10-15095. In FIG. 3, the magnetic yoke 22 is arranged on four sides so as to surround the permanent magnet 21, and is constituted by a bobbin 25 in which a permanent magnet 21 and a spring 24 for supporting the permanent magnet 21 are housed at both ends.

[0010] By supplying a pulse-wave alternating current to such a vibration actuator, vibration is generated by the movement of the permanent magnet. According to such a configuration, although vibration can be generated in the entire actuator, the bobbin 2
Since the weight of the permanent magnet 21 supported by the spring 24 in the inside 5 cannot be increased so much, only a slight vibration for a pager or the like is generated. Furthermore, the bobbin 25 around the permanent magnet 21 increases the magnetic gap and the magnetic resistance, resulting in a large loss. For this reason, it is difficult to take out a vibration with a large force by using a heavy mover.

That is, in order to generate sufficient vibration on the housing side as a vibration actuator, it is necessary to use a heavy movable element. For this purpose, it is necessary to securely hold the mover and to consider the efficiency of the magnetic circuit.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a vibration actuator capable of generating a sufficiently large vibration in a housing with a small loss of a magnetic circuit. It is in.

[0013]

The object of the present invention is to provide a bottomed hollow cylindrical housing having one open end and a bottom at the other end, provided at the bottom of the housing,
A hollow cylindrical portion extending inside the housing, a first hollow ring of a magnetic material provided on an inner cylindrical surface of the housing,
A cover for covering the open end surface of the housing, a fixed shaft supported by the cover and the bottom of the housing, and a second magnetic member provided on an outer cylinder surface of the hollow cylindrical portion.
A hollow ring, which is axially movably supported by the fixed shaft via a spacer, and is disposed in a space between an inner cylindrical surface of the first hollow ring and an outer cylindrical surface of the second hollow ring. A hollow cylindrical yoke, a first coil wound in a circumferential direction on an inner cylindrical surface of the first hollow ring, and a shaft mounted on the first coil on an inner cylindrical surface of the first hollow ring; A second coil disposed adjacent to the first coil at an interval in the direction and wound in a direction opposite to the first coil, and facing the first coil on an outer cylindrical surface of the second hollow ring. A third coil provided in the portion and wound in a direction opposite to the first coil;
A fourth coil provided on the outer cylinder surface of the second hollow ring and facing the second coil and wound in the same direction as the first coil, and a fourth coil wound on the outer cylinder surface of the yoke; A first magnet provided in an opposing portion of the first coil and magnetized in a radial direction; and a first magnet provided in an opposing portion of the second coil on an outer cylindrical surface of the yoke, and provided in a radial direction. A second magnet magnetized in a direction opposite to the first magnet, and a second magnet provided on an inner cylindrical surface of the yoke at a portion facing the third coil, and radially extending from the first magnet. A third magnet magnetized in the opposite direction;
A fourth magnet provided on an inner cylindrical surface of the yoke at a portion opposed to the fourth coil and magnetized in the same direction as the first magnet in a radial direction; A spring for positioning the spacer such that the first to fourth coils and the first to fourth coils are located at positions facing each other, and a bottom portion of the housing and the spacer. And a spring for positioning the spacer so that each of the first to fourth coils and each of the first to fourth coils are opposed to each other. This is achieved by a vibrating actuator.

[0014]

In the vibration actuator of the present invention, a first magnet, a first coil, a first hollow ring, a second coil,
A first magnetic circuit is formed by the second magnet and the yoke, and a second magnetic circuit is formed by the third magnet, the third coil, the second hollow ring, the fourth coil, the fourth magnet, and the yoke. Is done.
When an electric current is applied to the coils constituting the first and second magnetic circuits, a thrust generated in the coils is generated, and the housing moves around the yoke movably attached to the fixed shaft.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a sectional view of an embodiment of the present invention.

In FIG. 1, a housing 31 is formed of a hollow cylindrical member having a bottom and an open end. The housing 31 has a housing 31
Is formed with a hollow cylindrical portion 31a extending inside.
A first hollow ring 32 made of a magnetic material is provided on the inner cylindrical surface of the housing 31. A cover 33 covering the end face and having a hole 33a formed in the center is attached to the open end face of the housing 31 using screws or the like. The fixed shaft 34 is mounted between the cover 33 and the bottom of the housing 31. The second hollow ring 35 is made of a magnetic material, and is provided on the outer cylindrical surface of the hollow cylindrical portion 31a.

The yoke 39 is made of a hollow cylindrical magnetic material, is attached to the fixed shaft 37 via a nonmagnetic spacer 38 and a bearing 36, and has an inner cylinder surface of the housing 31 and an outer cylinder of the hollow cylinder portion 32. It is arranged in the space between the plane. In the space on the inner cylinder side of the hollow cylinder 31a,
A spacer 40 is attached to the fixed shaft 37 via a bearing 36 so as to be movable in the axial direction.

The first coil 41 is wound on the inner cylindrical surface of the first hollow ring 32 in the circumferential direction.
2 is a first coil 41 on the inner cylindrical surface of the first hollow ring 32.
Are arranged adjacent to each other with an interval in the axial direction.
The coil 41 is wound in the opposite direction.

The third coil 43 is provided on the outer cylindrical surface of the second hollow ring 35 at a position opposite to the first coil 41, and is wound in the opposite direction to the first coil. Coil 4
4 is a second coil 4 on the outer cylinder surface of the second hollow ring 35.
2 and is wound in the same direction as the first coil 41.

The magnet 45 is provided on the outer cylinder surface of the yoke 39 by a first
, And is magnetized in the radial direction (N pole on the outer cylinder side).
Provided on the outer cylinder surface of the second coil 42 at an opposing portion thereof,
It is magnetized in the direction opposite to the first magnet 45 in the radial direction.
The third magnet 47 is provided on the inner cylinder surface of the yoke 39 at a portion facing the third coil 43, and is magnetized in a direction opposite to the first magnet in the radial direction (N pole on the inner cylinder side). , The fourth magnet 4
Numeral 8 is provided on the inner cylindrical surface of the yoke 39 at a portion facing the fourth coil 44, and is magnetized in the same direction as the first magnet 45 in the radial direction.

The springs 49 and 50 are provided on the cover 3 respectively.
3, the center of the bottom of the housing 31 and the spacer 40
, The spacer 40 is movable along the fixed shaft 34 and the initial position is determined. That is, the magnets 45 to 48 are connected to the coils 41 to 4.
This is for maintaining the magnetic head 5 at a magnetic center position (neutral point). The lead wire 50 is connected to the first to fourth coils 41
To 45 are supplied.

Therefore, the first magnet 45 → the first coil 4
1 → first hollow ring 32 → second coil 42 → second magnet 46 → first magnetic circuit that goes round via yoke 39, and third magnet 47 → third coil 43 → second hollow Ring 35 → fourth coil 44 → fourth magnet 48 → yoke 3
9, a second magnetic circuit is formed.

The fixed shaft 34 is configured to be supported using the cover 33 and the hole at the bottom of the housing 31.
A configuration in which the cover and the housing can be fixed without providing a hole may be employed.

Next, the operation of the vibration actuator having the above configuration will be described. Using the lead wire 51, the first to fourth
When current flows through the coils 41 to 44, thrust is generated in the first to fourth coils 41 to 44 provided in the magnetic circuit according to the Fleming's left hand rule. Then, as a reaction of this thrust, the mover (the first yoke 39a, the magnet 4
5, the second yoke 39b) is about to move. As a reaction of this thrust, the mover (yoke 39) tries to move. In this case, by increasing the weight of the mover, the entire housing also vibrates with the thrust generated in the coil. That is, the first to fourth coils 41 to 4
By passing an alternating current through the housing 4, the housing 31 generates vibrations according to the current waveform.

With the above-described structure of the vibration actuator, Since the structure is such that the mover can be moved along the fixed axis, the weight of the mover can be increased. This makes it easy to extract a large vibration from the entire housing. 2. Since the initial position is determined by the spring when the mover can be moved along the fixed axis, the mover can be securely held at the magnetic center position (neutral point). Therefore, the efficiency of the magnetic circuit does not decrease even when a heavy mover is used. Thus, the weight of the mover can be increased, and large vibrations can be easily extracted from the entire housing. 3. There is only one magnetic gap in each magnetic circuit, and the gap length of the magnetic gap is small.
Since -48 are fixed to the inner and outer cylinder surfaces of the yoke 39, the magnetic resistance is small and the loss is small. 4. Since the magnets 45 to 48 are mounted on the inner and outer cylinder surfaces of the yoke with their own magnetic attraction, assembly is easy. 5. Since two sets of magnetic circuits are formed, it is easy to output a predetermined power.

As described above, according to the vibration actuator of this embodiment, it is possible to realize a vibration actuator capable of generating a sufficiently large vibration in the housing with a small loss of the magnetic circuit.

[0027]

As described above, according to the present invention, it is possible to realize a vibration actuator capable of generating a sufficiently large vibration in a housing with a small loss of a magnetic circuit.

[Brief description of the drawings]

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

FIG. 2 is a configuration diagram showing a configuration of a vibration actuator described in Japanese Utility Model Laid-Open No. 1-171578.

FIG. 3 is a configuration diagram showing a configuration of a vibration actuator described in Japanese Utility Model Laid-Open No. 5-28464.

[Explanation of symbols]

 31 Housing 31a Hollow cylindrical part 32 First hollow ring 33 Cover 34 Fixed shaft 35 Second hollow ring 36 Bearing 39 Yoke 40 Spacer 41 First coil 42 Second coil 43 Third coil 44 Fourth coil 45 First Magnet 46 second magnet 47 third magnet 48 fourth magnet

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-52-149312 (JP, A) JP-A-63-217962 (JP, A) JP-A-6-77483 (JP, U) JP-A-1 171578 (JP, U) Japanese Utility Model 5-80156 (JP, U) Japanese Utility Model 5-60158 (JP, U) Japanese Utility Model 5-70163 (JP, U) Japanese Utility Model 5-28464 (JP, U) Actual opening 1979-57317 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 7/00-7/20 H02K 33/00-33/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A hollow cylindrical housing (31) having an open end on one end and a bottom on the other end, provided at the bottom of the housing (31) and extending inside the housing (31). A hollow cylindrical portion (31a) protruding; a first hollow ring (32) of a magnetic material provided on an inner cylindrical surface of the housing (31); and a cover (33) covering an open end surface of the housing (31). A fixed shaft (34) supported on the bottom of the cover and the housing (31), and a second hollow ring (35) of a magnetic material provided on the outer cylindrical surface of the hollow cylindrical portion (31a). A first coil (41) wound in a circumferential direction on an inner cylindrical surface of the first hollow ring (32); and a first coil (41) wound on an inner cylindrical surface of the first hollow ring (32). Adjacent to the coil (41) with an interval in the axial direction A second coil (42) disposed and wound in a direction opposite to the first coil (41); and a first coil (42) on an outer cylindrical surface of the second hollow ring (35). A third coil (43) provided in the facing portion of (41) and wound in the opposite direction to the first coil (41)
A fourth coil, which is provided on the outer cylindrical surface of the second hollow ring (35) at a portion facing the second coil (42) and wound in the same direction as the first coil (41); The coil (44)
An inner cylindrical surface of the first hollow ring (32) and an outer cylindrical surface of the second hollow ring (35), which are supported on the fixed shaft (34) via a spacer (40) so as to be movable in the axial direction. And a yoke (39) having a hollow cylindrical shape disposed in a space between the first coil (41) and an outer cylinder surface of the yoke (39). A magnetized first magnet (45), which is provided on an outer cylindrical surface of the yoke (39) at an opposite portion of the second coil (42), and is provided in a radial direction with the first magnet (45); ), A second magnet (46) magnetized in the opposite direction to
A third coil (43) provided on the inner cylindrical surface of the yoke (39) at a position opposite to the third coil (43) and magnetized in a radial direction opposite to the first magnet (45); The magnet (47)
A fourth coil (44) provided on the inner cylindrical surface of the yoke (39) and facing the fourth coil (44) and radially magnetized in the same direction as the first magnet (45); The magnet (48)
And the first to fourth coils disposed between the cover (33) and the spacer (40).
A spring (49) for positioning said spacer (40) such that each of said coils is at an opposing position.
And the bottom of the housing (31) and the spacer (40).
And a spring (50) disposed between the first and fourth coils for positioning the spacer (40) such that the first to fourth coils and the first to fourth coils are respectively opposed to each other. A vibration actuator characterized by comprising: