JP2001352719A - Flat dc motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cost performance by simplifying the structure of a brush in a flat DC motor. SOLUTION: The terminals 131, 132 of the brush 130 are exposed from one part of an upper resin film 140a so that one end of conductive parts 114, 115 may be connected to a power source (not illustrated). The other end of the conductive parts 114, 115 form conductive brushes 116, 117 of which conductive parts are peeled by removing the upper resin film 140a, a lower resin film 140b, and which have front end parts 116a, 116b, 117a, 117b formed out of a pair of thin plate strips, each of which is divided into two portions. The front ends 116a, 116b, 117a, 117b are folded and bent in the upper direction of a rotating shaft 12, and disposed so as to slide in contact with a commutator 120.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor used in portable equipment, and more particularly to a commutator integrally formed with a permanent magnet to form a fixed commutator, which is disposed on an armature. And a brush of a flat type.

[0002]

2. Description of the Related Art Conventionally, portable devices such as a PHS and a mobile phone are received by vibration of a vibration motor without depending on sound being received so as not to disturb a quiet environment at the time of reception, such as a concert hall or a hospital. In many cases, a vibration motor that allows a user of a portable device to sense is provided. The vibration motor described above is required to be further improved in order to reduce the size and weight, to reduce the power consumption, to increase the exciting force, and to reduce the cost. To this end, various simplified configurations of the vibration motor have been tried. For example, a plurality of armature coils (3
Examples of the configuration of a flat DC motor for vibration by an eccentric rotor using the same are Japanese Patent Application Laid-Open No. 6-205565 (Document A) and Japanese Patent Application No. 2000-07498 filed in the same application.
No. 5 (Document B).

[0003] Document A shows the main configuration of a flat DC motor using three armature coils as shown in FIGS. FIG. 6 shows a main sectional view, and FIG. 7 shows an arrangement of three armature coils. Hereinafter, Document A will be described with reference to the drawings.

As shown in FIGS. 6 and 7, a flat DC motor 300 for generating vibration includes a disk-shaped permanent magnet 303 magnetized to four poles in a thickness direction fixed to the bottom of a casing 302. An electric machine in which three fan-shaped coils 306a, 306b, 306c facing each other via a gap are arranged in substantially the same plane, and fixed together with a commutator 308 having a plurality of segments on a rotor shaft 305. And a pair of brushes 309 contacting the commutator 308. When a DC power supply is connected to the pair of brushes 309, three fan-shaped coils 306a, 306b, 306c
Rectified current flows through the armature 304 and the armature 304 rotates in a predetermined direction. To use as a vibration generation motor,
By making the armature 304 largely eccentric, the armature 3
When a large centrifugal force is generated at 04 and it rotates, strong vibration is generated in the whole apparatus.

[0005] Document A discloses that the eccentric armature 304 causes the armature 304 to rotate, thereby generating a large centrifugal force and generating strong vibration in the entire apparatus. However, in the structure of the DC motor of Document A, the commutator 308 formed on the armature 304 is provided with a pair of bent brushes 309 as independent components, and the number of components is increased by one. It is not easy.

Document B is a top view of a plurality of permanent magnets and brushes of a flat DC motor, as schematically shown in FIG. Four fan-shaped permanent magnet pieces 400a,
400b, 400c, and 400d are provided on a lower case 404 made of a magnetic material on spaces 401a, 401b, and 401, respectively.
armature (not shown) separated from each other by c and 401d
Permanent magnet pieces 400a, 400b, 400c facing
The 400d magnetic pole faces are alternately magnetized to different magnetic polarities. Spaces 401a, 401b, 401c, 401
In adjacent spaces in d, for example, 401a and 401d,
A pair of brushes 402, 403, one end of which is insulated from and fixed to the lower yoke 404, are displaced in a direction facing the armature. The other end of the pair of brushes 402 and 403 is connected to a commutator (not shown) that is branched into a plurality of pieces and provided on the lower surface of the armature to maintain soft spring properties and complete electrical conduction. Combine. As in Document A, a pair of folded brushes 402 and 403 are provided as independent components, and the number of components is one, and the structure is not simple.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to simplify the brush structure of a flat DC motor and to improve the assemblability, thereby improving the assemblability of a flat-type DC motor. Is removed from the resin of the flexible printed circuit board, and is formed to be in sliding contact with the surface of the commutator on the armature. The flat DC motor according to claim 1 of the present invention is formed by a cup-shaped yoke facing a magnetic pole surface of a disk-shaped permanent magnet having a plurality of poles magnetized in a thickness direction. An armature in which a plurality of fan-shaped coils are disposed substantially in the same plane through a magnetic pole surface and a gap in a magnetic field, and are fixed together with a commutator including a plurality of segments to a rotating shaft. And a vibration motor comprising a pair of brushes that come into contact with the commutator, wherein the pair of brushes is constituted by a conductor of a flexible printed circuit board connected to a power supply.

According to another aspect of the present invention, there is provided a flat DC motor, wherein the pair of brushes comprises: a flexible printed circuit board having one end connected to a power supply; Either the upper or lower resin film of the flexible printed wiring board is removed from the end of the conductor portion covered in a sandwich shape with the upper and lower resin films, and the conductor portion is slid on the surface of the commutator on the armature. It is characterized by being formed so as to contact.

According to a third aspect of the present invention, there is provided a flat-type DC motor comprising a pair of brushes, wherein one end of the brush is sandwiched between upper and lower resin films of a flexible printed circuit board connected to a power supply. The upper end of the conductor portion coated on the flexible printed wiring board is formed by removing any one of the upper and lower resin films and folding it back, so that the conductor portion slides on the surface of the commutator on the armature. It is characterized by being formed.

According to a fourth aspect of the present invention, there is provided a flat type DC motor, wherein the commutator has four conductive metal film segments which are divided into approximately 1/4 in a diameter direction. Are formed in a substantially planar shape, and segments which are point-symmetric with respect to the rotor axis are electrically connected to the same potential to form a commutator. The commutator to which the armature coil is connected and a pair of brushes It is characterized by dynamic contact.

According to a fifth aspect of the present invention, there is provided a flat type DC motor having four permanent magnets and one or two armature coils.
And wherein the armature coil is eccentric with respect to the armature center.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a half sectional view of a flat DC motor showing a first embodiment of the present invention. FIG. 2 (A)
FIG. 2 is a development view of a brush of the flat DC motor of the present invention.
FIG. 2B is a cross-sectional view taken along the line ZZ in FIG. FIG.
FIG. 4 is a half sectional view of a flat DC motor according to a second embodiment. FIG. 4 is a development view of another brush of the flat DC motor of the present invention. FIG. 5 is a development view of another brush of the flat DC motor of the present invention.

In FIGS. 1, 2 (A) and 2 (B),
The flat DC motor 100 of the present invention includes an upper yoke 101,
It is composed of an armature 110, a commutator 120, a flexible printed circuit board 130, and a lower yoke 151.

At the center of a cup-shaped upper yoke 101 made of a magnetic material, a bearing 102 made of oiles metal or the like is fixed. The armature 110 includes a semi-disc-shaped armature coil 111 attached to a rotor shaft 112 and an armature holder 1.
13 and fixed. The pair of brushes 130 is formed of a flexible printed circuit board in which thin-film conductors 114 and 115 are covered with an upper resin film 140a and a lower resin film 140b in a sandwich shape. The center of the upper resin film 140a has a center hole 13 for preventing interference with the rotor shaft 112.
3 are provided. Terminals 131 and 13 of brush 130
2 is exposed from a part of the upper resin film 140a so that one ends of the conductors 114 and 115 are connected to a power supply (not shown). One end of each of the conductors 114 and 115 becomes conductive brushes 116 and 117 in a form in which the upper resin film 140a and the lower resin film 140b are removed and the conductors are stripped. Divided tip portions 116a, 11
6b, 117a and 117b.
116 b, 117 a, 117 b are disposed so as to be bent and bent upward of the rotor shaft 112, and to be in sliding contact with the commutator 120.

Referring to FIG. 3, a flat DC motor 200 for generating vibration is opposed to a disk-shaped permanent magnet 203 fixed to the bottom of a casing 202 and magnetized to four poles in the thickness direction via a gap. A fan-shaped armature coil 204 is disposed in substantially the same plane and is fixed to a rotor shaft 205 together with a commutator 208 having a plurality of segments. The upper end is formed of a pair of brushes 209 bent upward. When a DC power supply is connected to the pair of brushes 209, a rectified current flows through the armature coil 204, and the armature 2
04 rotates in a predetermined direction. In order to use the motor as a vibration generating motor, a large centrifugal force is generated in the armature 210 by rotating the armature 210 by large eccentricity, so that a strong vibration is generated in the entire apparatus. In this embodiment, the number of the armature coils 204 of the armature 210 may be any one to three.

3 and 4, in the brush 230, the conductor portions 231 and 232 are made of an upper resin film 235a and a lower resin film 23.
The flexible printed circuit board is sandwiched in 5b. Terminal 236 of brush 230,
237 is a power source (not shown) at one end of the conductor parts 231 and 232.
Is exposed from a part of the upper resin film 235a so as to be connected to the upper resin film 235a. One end of each of the conductor portions 231 and 232 is a conductive brush 233 or 234 in a form in which the upper resin film 235a and the lower resin film 235b are removed and the conductor portion is exposed, and is formed into a pair of thin strips. Split tip 233
a, 233b, 234a, 234b,
33a, 233b, 234a and 234b are the rotor shaft 2
The commutator 208 is arranged so as to be flexed on the X-ray in the upward direction and to be in sliding contact with the commutator 208.

Referring to FIG. 5, the brush 250 is
43 and 244 are formed of a flexible printed wiring board covered in a sandwich shape with an upper resin film 240a and a lower resin film 240b. Terminals 241 and 242 of brush 250
Are exposed from a part of the upper resin film 240a so that one ends of the conductor portions 243 and 244 are connected to a power supply (not shown).
One end of the brush 250 is divided into a pair of two thin strip-shaped strips which are bent upward in the Y line by removing the upper resin film 240a and the lower resin film 240 and exposing the conductor. Tip portions 245a, 245b, 246a, 24
Conductive brushes 243 and 244 having 6b are disposed in sliding contact with the commutator 208. The tip portions 245a, 245b, 246a, and 246b are formed by being folded on substantially the same plane,
Since there is a resin coating from 242 to the Y line, the strength and the flexibility of the spring are obtained at the same time.

In any of the embodiments shown in FIGS. 1 to 5, the brush is formed integrally with the flexible printed circuit board, so that the connection between the brush and the printed circuit board as in the conventional example is made by soldering, for example. No action is required.

[0019]

According to the present invention, it is possible to realize an excellent vibration motor having a simple brush structure, good assemblability, and improved cost / performance.

Further, according to the present invention, since the brush is formed integrally with the flexible printed circuit board, the vibration motor can be easily made thin.

[Brief description of the drawings]

FIG. 1 is a half sectional view of a flat DC motor according to a first embodiment of the present invention.

FIG. 2A is a development view of a brush of the flat DC motor of the present invention. FIG. 2B is a sectional view taken along line ZZ of FIG.

FIG. 3 is a half sectional view of a flat DC motor showing a second embodiment.

FIG. 4 is a development view of another brush of the flat DC motor of the present invention.

FIG. 5 is a development view of another brush of the flat DC motor of the present invention.

FIG. 6 is a main configuration diagram of a conventional flat DC motor.

FIG. 7 shows an arrangement of three armature coils in a conventional example.

FIG. 8 shows an example of Japanese Patent Application No. 2000-047985.

[Explanation of symbols]

100, 200 Flat DC motor 101 Upper yoke 102, 152 Bearing 110, 210 Armature 111, 204 Armature coil 112, 205 Rotor shaft 113 Armature holder 114, 115, 231, 232, 243, 244 Conductor 116a , 116b, 117a, 117b, 233a,
233b, 234a, 234b, 245a, 245b,
246a, 246b Brush tip 120, 208 Commutator 121, 203 Disc-shaped permanent magnet 130, 230, 250 Brush 131, 132, 236, 237, 241, 242 Terminal 140a, 235a, 240a Upper resin film 140b, 235b, 240b Lower Resin film 151 Lower yoke 202, 209 Casing

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 23/54 H02K 23/54 23/58 23/58 Z

Claims (5)

[Claims] In a magnetic field formed by a magnetic pole surface of a disk-shaped permanent magnet having a plurality of poles magnetized in a thickness direction and a cup-shaped yoke opposed to the magnetic pole surface, a plurality of magnetic poles are formed via a gap between the magnetic pole surface of the permanent magnet and a gap. An armature having a plurality of fan-shaped coils disposed substantially in the same plane and fixed together with a commutator comprising a plurality of segments on a rotating shaft, and a vibration motor comprising a pair of brushes contacting the commutator. A flat-type DC motor, wherein the pair of brushes are constituted by conductors of a flexible printed circuit board connected to a power supply. 2. A structure of the pair of brushes, wherein one end of a conductor portion coated in a sandwich shape with a resin film above and below the flexible printed wiring board, one end of which is connected to a power supply, is connected to the upper and lower sides of the flexible printed wiring board. 2. The flat DC motor according to claim 1, wherein the resin film is removed, and the conductor portion is formed to be in sliding contact with the surface of the commutator on the armature. 3. A configuration of the pair of brushes, wherein one end of a conductor portion coated in a sandwich shape with a resin film above and below the flexible printed circuit board whose one end is connected to a power source is connected to the upper and lower sides of the flexible printed circuit board. 2. The flat DC motor according to claim 1, wherein said resin film is removed, folded back, and formed so that said conductor portion is in sliding contact with a surface of said commutator on said armature. 4. The configuration of the commutator is approximately one in the diameter direction.
The four conductive metal film segments divided into are formed in a substantially planar shape, and the segments which are point-symmetric with respect to the rotor axis are electrically connected to the same potential to form a commutator. The flat type DC motor according to any one of claims 1 to 3, wherein the commutator connected to the first DC motor and the pair of brushes are in sliding contact with each other. 5. The method according to claim 1, wherein the number of poles of the permanent magnet is four, the configuration of the armature coil is one or two, and the armature coil is eccentric with respect to the armature center. The flat DC motor according to any one of claims 1 to 4.