JP2000070856A - Vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration motor which can enlarge bodily feeled vibration with a simple structure. SOLUTION: A bodily feeled vibration generating part 47 and an electric acoustic converting part 46 for generating a voice are provided. As the electric acoustic converting part 46, a vibration motor 1 provided with a second magnet 25, a voice coil 27, a pole piece 26, a vibrator 28 vibrating integrally with the voice coil 27 and the second electric circuit electrically connected with the voice coil 27 in a case 4 is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a pager, PH
The present invention relates to a vibration motor used for a portable wireless communication device such as a mobile phone and a mobile phone.

[0002]

2. Description of the Related Art As this kind of invention, a vibration motor which generates voice and ringing sound and generates bodily sensation is disclosed in Japanese Utility Model Registration No. 2570923 and the like. In the inventions disclosed in these publications, one voice coil is used to generate a voice and a ringing tone. This voice coil contributes to generation of bodily sensation vibration. The voice coil drive circuit has a function of switching between a current that generates a voice and a ringing tone and a current that contributes to the generation of bodily sensation vibration. The vibration motor generates vibration by linearly reciprocating a vibrating body that generates bodily sensation vibration.

[0003]

However, in the above-mentioned prior art, the voice coil drive circuit has a function of switching between a current for generating a voice and a ringing tone and a current for contributing to the generation of bodily sensation vibration. Is a complicated circuit. On the other hand, since the vibration motor is intended to be built in a portable wireless communication device, the vibration motor must be small. For this reason, the vibrating body that generates the bodily sensation vibration built in the conventional vibration motor has a small linear motion in the housing of the vibration motor, and the sensible vibration that can be generated is small.

Therefore, an object of the present invention is to provide a simple structure,
An object of the present invention is to provide a vibration motor capable of increasing bodily sensation vibration.

[0005]

In order to achieve the above object, the invention according to claim 1 includes a sensational vibration generating unit and an electroacoustic conversion unit for generating voice, and the sensational vibration generating unit includes A first ring-shaped magnet having two or more magnetic poles so that magnetic poles arranged next to each other in the direction are different from each other, a rotating shaft, a stator having a brush, and a gap in the rotating shaft direction. A rotor comprising: an armature having a coil that faces the first magnet and rotates with respect to the rotation axis; a commutator electrically connected to the armature; and a bearing for the rotation axis; And a first electric circuit electrically connected to the armature, wherein the electroacoustic conversion unit vibrates integrally with the second magnet, the voice coil, the pole piece, and the voice coil. Vibrator and
A vibration motor, wherein the case includes a second electric circuit electrically connected to the voice coil.

According to the first aspect of the present invention, the first
Since the electric circuit and the second electric circuit are provided separately,
There is no need to specifically design an electric circuit for bodily sensation vibration and electro-acoustic conversion. This is because the vibration motor is provided with the coil contributing to the generation of bodily sensation vibration and the voice coil contributing to electro-acoustic conversion. Further, since the rotor rotates perpendicularly to the rotation axis, the rotation axis can be shortened, and the vibration motor can easily generate a bodily sensation that can be sufficiently sensed simply by increasing it in the radial direction. Can be. Further, since the magnetic circuit including the first magnet contributing to the generation of bodily sensation and the magnetic circuit including the second magnet contributing to the electroacoustic conversion can be configured separately, the structure of the vibration motor is complicated. It is possible to have a function of generating bodily sensation vibration and a function of electro-acoustic conversion without having to perform the operation.

According to a second aspect of the present invention, in the first aspect, the case is cup-shaped, and vibrates integrally with the second magnet, the voice coil, the pole piece, and the voice coil. A vibrator is included in the recess of the case.

According to the second aspect of the present invention, it is possible to protect two parts, the body vibration generation unit and the electroacoustic conversion unit, with one case.

According to a third aspect of the present invention, in the first aspect of the invention, the case is cup-shaped and made of a magnetic material, and an annular convex portion is formed on a convex side surface of the case. A second magnet, a pole piece, and a voice coil are housed inside the annular projection.

According to the third aspect of the present invention, the annular convex portion, the flat portion inside the annular convex portion, the second magnet, and the pole piece form a magnetic circuit. The magnetic field in the gap with the pole piece can be increased.

[0011] The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention described in (1), the annular first magnet has four magnetic poles, and the coil is composed of three coil portions, and the three coil portions are arranged in a circumferential direction so as to form a three-phase arrangement. And are arranged so as to overlap with each other and have a flat-centered shape that does not form a perfect circle when viewed from the axial direction, and are formed in a flat shape.

According to the fourth aspect of the present invention, since the number of poles is small, the magnetized yoke of the first magnet has a relatively simple structure and can be easily manufactured. Further, since the weight of the center of gravity of the coil increases, the bodily sensation vibration can be further increased.

[0013] The invention according to claim 5 is the invention according to claims 1 to 4.
Wherein the rotor has a weight made of a nonmagnetic metal.

According to the fifth aspect of the present invention, the vibration motor can generate the bodily sensation vibration not only in the journal direction but also in the thrust direction with respect to the rotating shaft, so that the bodily sensation vibration is further increased. This is because the weight made of a nonmagnetic metal rotates relative to the magnetic field created by the first magnet, thereby generating an eddy current therein and vibrating in the thrust direction with respect to the rotation axis. It is.
In addition, the weight of the rotor increases due to the weight, and a greater bodily sensation can be obtained.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to FIG.
The first embodiment of the present invention will be described in detail with reference to FIG. The vibration motor 1 according to this embodiment generally includes a bodily sensation vibration generator 47 and an electroacoustic converter 46 as shown in FIGS. First, the electroacoustic converter 46 will be described in detail.

The circular iron plate 24 has a circular dish-shaped portion having a substantially U-shaped cross section at the center thereof. The iron plate 24 has a groove 24C formed on the outer periphery of the dish-shaped portion. A thin cylindrical second magnet 25 is fixedly arranged at the center of the flat portion 24B of the dish-shaped portion so that one end surface thereof is in contact with the second magnet 25. Second
The magnet 25 has one magnetic pole pair, and both end faces of the second magnet 25 each have a single magnetic pole. The pole piece (yoke) 26 is fixedly disposed on the other end surface of the second magnet 25 at a position coaxial with the second magnet 25. The outer diameter of the pole piece 26 is slightly larger than that of the second magnet 25 and is made of a magnetic material. A voice coil 27 is disposed in a gap 24D located between the upright portion 24A forming the outer periphery of the dish-shaped portion and the outer periphery of the pole piece 26. The vibrator 28 and the voice coil 27 are bonded with a rubber adhesive. The voice coil 27 is formed in an annular shape, and the conductor 31 of the voice coil 27 is bonded to the vibrator 28 with a rubber-based adhesive to connect the iron plate 24 and the inner wall of the case 4.
And is electrically connected to the electroacoustic transducer conductive pattern 8 formed on the substrate. 11 is a lead wire for electric sound.

The vibrator 28 is a thin film made of a heat-resistant polyimide-based material. The vibrator 28 has a disk shape, and its outer peripheral portion is arranged so as to enter the groove 24C of the iron plate 24, and the vibrator 28 is bonded to the iron plate 24 with a rubber-based adhesive. Between the upright portion 24A and the groove portion 24C of the iron plate 24, a back pressure through hole 29 for applying a back pressure to the vibrator 28 is provided along the circumference. A back pressure through-hole 30 is also provided along the circumference on the outer periphery of the groove 24C of the iron plate 24. When the electro-acoustic transducer configured as described above is used as a speaker, the electro-acoustic transducer is applied to the voice coil 27 in a magnetic circuit formed by the second magnet 25, the pole piece 26, and the dish-shaped portion of the iron plate 24. Lead wire 1
The voice current flows from the voice coil 27
1 and 2, the vibration in the vertical direction is generated, and this vibrates the vibrator 28 to generate sound. When this electroacoustic converter is used as a microphone, the voice coil 27 vibrates in the magnetic circuit by vibrating the vibrator 28 in response to a sound wave.
A voice current is generated. This audio current flows to the second electric circuit 71 through the electroacoustic conversion lead wire 11.

The case 4 is of a cup type. Case 4
A step 60 of a slight width is provided on the inner peripheral wall. The outer diameter of the iron plate 24 and the inner diameter of the recess of the case 4 are substantially the same, and the iron plate 24 is fitted into the recess 61 of the case 4, and the iron plate 24 is supported by the step 60. The flat portion of the case 4 is provided with a plurality of holes 32 through which sound waves pass. A part of the open end of the case 4 is cut out, and the lead wire attaching piece 7 of the bracket 6 is fitted into this part.
A vibrator 28 is provided in the space formed by the case 4 and the iron plate 24.
, A voice coil 27, a pole piece 26, and a second magnet 25. FIG. 4 shows a configuration of the vibrator 28 and the voice coil 27. 31 is a conductor of the coil.

Next, the bodily sensation vibration generator 47 will be described in detail. The body vibration generating unit includes the rotor 3 and the stator 2. The stator 2 includes a bracket 6 and a first magnet 5
And a first brush 14, a second brush 15, and a rotating shaft 18. The first magnet 5 has a thin cylindrical shape. The first magnet 5 is magnetized with two pairs of magnetic poles, and both end surfaces thereof are N-poles such that magnetic poles adjacent in the circumferential direction have different polarities.
The poles and S poles are alternately magnetized into two pole pairs. One magnetic pole width of the first magnet 5 is 90 ° in mechanical angle. The first magnet 5 uses a rare earth neodymium-iron-boron magnet to obtain a high magnetic flux density. The bracket 6 is made of a magnetic material, and a conductive portion of the conductive pattern 9 for vibration generation and the conductive pattern 8 for electroacoustic conversion is printed on one end surface. The conductive pattern 9 for generating vibration includes the first brush 14 and the second brush 14.
It is electrically connected to the brush 15. An insulating paint containing epoxy resin and titanium oxide as main components is applied from above the printed board on one end surface of the bracket 6 so as to electrically insulate the printed board from the rest. The first on one end of the bracket 6
The magnet 5 is arranged. A first brush 14 and a second brush 14 are provided on an inner peripheral portion of the first magnet 5 on one end surface of the bracket 6.
The brush 15 is planted. A through hole 13 is provided at substantially the center of the bracket 6, and the rotating shaft 18 is fitted therein. FIG. 7 is an enlarged view of the first brush 14 and the second brush 15.
FIG. 8 shows a cross section XX of the second bracket 15. The first brush contact 16 and the second brush contact 17 are formed by commutator pieces 35 to provided on the flat commutator substrate 22 of the rotor 3.
It comes into sliding contact with 40. Since the rotor 3 rotates relatively with respect to the first brush 14 and the second brush 14, the first brush contact 16 and the second brush contact 17 are connected to the commutator pieces 35 to
It moves while making contact with 40.

Next, the rotor 3 will be described in detail. The rotor 3 includes a bearing 45 and an armature 29. The armature 29 includes a first coil 19, a second coil 20, a third coil 21, a flat commutator substrate 22, a weight 33, and a commutator piece 3.
5-40. The bearing 45 uses an oilless metal sleeve. The bearing 45 is fitted and fixed in the through hole 34 provided at the center of the flat commutator substrate 22. The plate-shaped commutator substrate 22 is a double-sided substrate, and both surfaces are electrically connected by through holes. On one end surface of the flat commutator substrate 22 where the first brush contact 16 and the second brush contact 17 are in sliding contact, commutator pieces 35 to 40 are printed with copper foil so as to be arranged on one circumference. . First
The commutator segment 35 and the fourth commutator segment 38, and the third commutator segment 37 and the sixth commutator segment 40 are electrically connected at the other end surface of the flat commutator substrate 22. The second commutator 36 and the fifth commutator 39 are electrically connected at one end surface of the flat commutator substrate 22. One end of each of the first coil 19, the second coil 20, and the third coil 21 is connected, and the coils 19 to 21 are connected by a delta connection. The other end of the first coil 19 is in conduction with the sixth commutator piece 40. Second coil 20
The other terminal is electrically connected to the fourth commutator piece 38. The other end of the third coil 21 is electrically connected to the second commutator piece. The coils 19 to 21 are wound around a fan-shaped conductor having a crossing angle of 90 ° between 20C and 20D. Since the first coil 19, the second coil 20, and the third coil 21 have the same configuration, only the second coil 20 will be described. Side 20 extending in the circumferential direction
A and 20B are portions that do not contribute to the generation of the rotation torque of the rotor 3, and sides 20C and 20D extending in the radial direction are portions that contribute to the generation of the rotation torque of the rotor 3. As shown in FIG. 5, the coils 19 to 21 are arranged in two layers, the first coil 19 and the third coil 21 are arranged in the first layer, and the second coil is arranged in the second layer. First coil 19
Are arranged in the circumferential direction by 60 ° with respect to the second coil 20, and the third coil 21 is
It is arranged to be shifted by 60 ° in the other circumferential direction. Second coil 2
A weight 33 made of non-magnetic lead is arranged in the air core portion surrounded by the four sides 20A to 20D of the zero. This weight 33
Is used to increase the center of gravity of the rotor 3.
Is rotated, the bodily sensation in the direction perpendicular to the rotation axis 18 is increased. Furthermore, since the weight 33 is a non-magnetic material, an eddy current is generated inside the weight 33 by rotating in the magnetic field of the first magnet 5. Due to the eddy current, the weight 33 receives a force from the magnetic field of the first magnet.
Since the first magnet has four magnetic poles, the force applied to the weight 33 is reversed between the N pole and the S pole, and the weight 33 vibrates. The vibration of the weight 33 becomes a bodily sensation in the rotation axis direction of the vibration motor 1.

FIG. 9 is a development view of the vibration motor 1, and FIG.
Magnet, coils 19 to 21 and commutator pieces 35 to 4
0, relative positions of the brush contacts 16, 17 and the weight 33.

FIG. 3 shows a front view of the vibration motor 1. An electroacoustic transducer lead wire 11 is connected to the electroacoustic transducer conductive pattern 8 formed on the lead wire attaching piece 7 by soldering. Further, the vibration generating lead wire 11 is connected to the vibration generating conductive pattern 9 by soldering.

The brushes 14, 15 are made of a spring material having good electrical conductivity. The brush contacts 16, 17 sliding on the commutator pieces 35 to 40 are made of an alloy containing gold, silver, copper, palladium, platinum, or the like as a main component, and have stability against surrounding gas, conductivity, and abrasion resistance. Increases wearability. FIG.
, Brushes 14 and 15 are pushing rotor 3 upward. The slider 23 is provided on the lower surface of the iron plate 24 in FIG.
Is affixed. The slider 23 slides on the upper surface of the bearing 22 of the rotor 3 in FIG. The slider 23 is made of a material having low sliding friction. Rotor 3
In this case, a stable rotation can be obtained because the bearing 22 slides and rotates with the slider 23.

Next, effects of the present embodiment will be described. Since the magnetic circuits of the bodily sensation generating unit 47 and the electroacoustic converting unit 46 are separately configured, the vibration motor 1
Is simple in structure. Since the vibrator 28 is a thin film made of a polyimide-based material, the vibrator 28 has excellent heat resistance and good responsiveness to audio signals. When the electro-acoustic conversion unit is used as a speaker, voice is transmitted from the electro-acoustic conversion lead wire 11 to the voice coil 27 in a magnetic circuit formed by the second magnet 25, the pole piece 26, and the dish-shaped portion of the iron plate 24. When the current flows, the voice coil 2
In FIG. 7, a vertical vibration in FIGS. 1 and 2 is generated, and this vibrates the vibrator 28 to generate sound. When the electroacoustic converter is used as a microphone, the voice coil 27 vibrates in the magnetic circuit due to the vibration of the vibrator 28 in response to a sound wave.
7, a voice current is generated. This audio current flows to the second electric circuit 71 through the electroacoustic conversion lead wire 11.
The first magnet 5 uses a rare earth neodymium-iron-boron magnet to obtain a high magnetic flux density. An insulating paint containing epoxy resin and titanium oxide as main components is applied from above the printed board on one end surface of the bracket 6 so as to electrically insulate the printed board from the rest. Since the weight 33 is a non-magnetic material, an eddy current is generated inside the weight 33 by rotating in the magnetic field of the first magnet 5. Due to this eddy current, the weight 33 receives a force from the magnetic field of the first magnet. Since the first magnet has four magnetic poles, the force applied to the weight 33 is reversed between the N pole and the S pole, and the weight 33 vibrates. The vibration of the weight 33 becomes a bodily sensation in the rotation axis direction of the vibration motor 1. The rotor 3 is configured such that the bearing 22 is
Stable rotation can be obtained by sliding rotation with 3.

Next, a vibration motor 101 according to a second embodiment of the present invention will be described with reference to FIGS. However, portions common to the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

The case 124 is made of a magnetic material and is cup-shaped.
7 is built in. In a flat portion of the upper surface of the case 124 in FIG. 11, a circular dish-shaped portion having a substantially U-shaped cross section is formed, and a groove 124C is formed on the outer periphery of the dish-shaped portion. A second magnet 25 is provided at the center of the flat portion 124B of the dish-shaped portion.
Are arranged, and the pole piece 26 is further arranged thereon. Standing portion 124A forming the outer periphery of the dish-shaped portion
Constitutes a part of the magnetic circuit together with the second magnet 25 and the pole piece 26. The outer periphery of the vibrator 28 is located in the groove 124C. A back pressure through-hole 129 for applying back pressure to the vibrator 28 is provided along the circumference between the upright portion 124A and the groove portion 124C in the flat portion of the case 124. In the flat portion of the case 124,
A back pressure through-hole 130 is also provided along the circumference on the outer periphery of the groove 124C.

Next, the operation and effect of this embodiment will be described. By incorporating the body vibration generating unit 47 in the concave portion of the case 124 and providing the electroacoustic converter 46 in the flat portion of the convex portion of the case 124, the number of parts of the vibration motor 101 is reduced, and the number of assembling steps is reduced.

The present invention is not limited to the above-described embodiment, but can be variously modified without departing from the gist of the present invention. For example, the number of coils in the rotor 3 may be two. Also, the coils need not be shifted in the circumferential direction. The weight 33 may use brass in addition to lead, and the weight 33 may not be used.

[0029]

According to the first aspect of the present invention, since the first electric circuit and the second electric circuit are separately provided, the electric circuit for the bodily sensation vibration and the electro-acoustic conversion is specially designed. No need. Further, since the rotor rotates perpendicularly to the rotation axis, the rotation axis can be shortened, and the vibration motor can easily generate a bodily sensation that can be sufficiently sensed simply by increasing it in the radial direction. Can be. Further, since the magnetic circuit including the first magnet contributing to the generation of bodily sensation and the magnetic circuit including the second magnet contributing to the electroacoustic conversion can be configured separately, the structure of the vibration motor is complicated. It is possible to have a function of generating bodily sensation vibration and a function of electro-acoustic conversion without having to perform the operation.

According to the second aspect of the present invention, two parts, the body vibration generation unit and the electroacoustic conversion unit, can be protected by one case.

According to the third aspect of the present invention, the annular convex portion, the flat portion inside the annular convex portion, the second magnet, and the pole piece form a magnetic circuit. The magnetic field in the gap with the pole piece can be increased.

According to the fourth aspect of the present invention, since the number of poles is small, the magnetized yoke of the first magnet has a relatively simple structure and can be easily manufactured. Further, since the weight of the center of gravity of the coil increases, the bodily sensation vibration can be further increased.

According to the fifth aspect of the present invention, the vibration motor can generate the bodily sensation vibration not only in the journal direction but also in the thrust direction with respect to the rotating shaft, and the bodily sensation vibration is further increased. In addition, the weight of the rotor increases due to the weight, and a greater bodily sensation can be obtained.

[0034]

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a vibration motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the vibration motor shown in FIG.

FIG. 3 is a front view of the vibration motor shown in FIG. 1;

FIG. 4 is a perspective view of a vibrator and a voice coil of the vibration motor shown in FIG. 1;

FIG. 5 is a front view of an armature of the vibration motor shown in FIG. 1;

FIG. 6 is a rear view of the armature of the vibration motor shown in FIG. 1;

FIG. 7 is a front view of a first brush and a second brush of the vibration motor shown in FIG. 1;

FIG. 8 is a sectional view taken along line XX shown in FIG. 7;

FIG. 9 is a developed view of the vibration motor shown in FIG. 1;

FIG. 10 is an exploded perspective view of a vibration motor according to a second embodiment of the present invention.

FIG. 11 is a sectional view of the vibration motor shown in FIG. 10;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 101 Vibration motor 2 Stator 3 Rotor 4, 124 Case 5 1st magnet 18 Rotation axis 14 1st brush 15 2nd brush 19 1st coil 20 2nd coil 21 3rd coil 22 Plate commutator board 25 2nd magnet 26 pole piece 27 voice coil 28 oscillator 29 armature 33 weight 35 first commutator piece 36 second commutator piece 37 third commutator piece 38 fourth commutator piece 39 fifth commutator piece 40 sixth commutator piece 45 Bearing 46 Electroacoustic converter 47 Body vibration generator-13-

Claims (5)

[Claims] 1. A bodily sensation vibration generating unit and an electroacoustic conversion unit for generating a sound, wherein the bodily sensation vibration generating unit has a circle having two or more magnetic poles such that adjacent magnetic poles in the circumferential direction have different polarities. An armature having a stator having an annular first magnet, a rotating shaft, and a brush, and a coil that faces the first magnet through a gap in the rotating shaft direction and rotates with respect to the rotating shaft. A rotor including a commutator electrically connected to the armature, a bearing for the rotating shaft, a case including the rotor, and a first electric circuit electrically connected to the armature. The electro-acoustic conversion unit includes a second magnet, a voice coil, a pole piece, a vibrator integrally vibrating with the voice coil, and a second electric circuit electrically connected to the voice coil. , Provided in the case, Vibration motor. 2. The case is cup-shaped, and a second magnet, a voice coil, a pole piece, and a vibrator vibrating integrally with the voice coil are included in a recess of the case. The vibration motor according to claim 1, wherein: 3. The case is cup-shaped and made of a magnetic material, and has an annular convex portion formed on a convex side surface of the case, and a second magnet, a pole piece and a second magnet inside the annular convex portion. The vibration motor according to claim 1, wherein the vibration motor houses a voice coil. 4. The ring-shaped first magnet has four magnetic poles, and the coil is formed of three coil portions. The three coil portions are arranged in a circumferential direction so as to form a three-phase arrangement. Displaced and placed so as to overlap each other,
4. A flat center of gravity that does not form a perfect circle when viewed from the axial direction, and is formed in a flat shape.
A vibration motor according to claim 1. 5. The vibration motor according to claim 1, wherein the rotor has a weight made of a nonmagnetic metal.