JP2003134721A - Small vibration motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply surely, and electrically connect conducting terminals of a motor and a power supply of an equipment main at a low cost. SOLUTION: The small vibration motor is provided with a motor case 2 having a rotational shaft, a stator, a rotor and a commutator inside, an eccentric weight 3 fixed to an end of the rotational shaft, a brush mount 4a mounted to an opening end of the motor case 2, a pair of brushes fixed to the brush mount and contacting the commutator, a terminal block 4b integrally molded with the brush mount and abutting on a circumference of the motor case, a pair of guide grooves 4c formed on the terminal block in parallel, pin conducting terminals 5 fitted into the guide grooves and contacts 5b formed on the pin conducting terminals and outwardly protruding from the guide grooves. The pin conducting terminals and brushes are electrically connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small vibration motor used as a vibration source for calling in a mobile communication device such as a mobile phone.

[0002]

2. Description of the Related Art In the small vibration motor described above, an eccentric weight is attached to a rotary shaft protruding from the motor, and vibration is generated by rotating the eccentric weight. Two lead wires extend from the motor. Conventionally, when assembling the motor to the device body, the lead wire is manually positioned to the power supply unit on the device body side, and the lead wires are connected by soldering. However, positioning and soldering work required time and effort.

In order to solve this problem, Japanese Patent Laid-Open No. 11-
In Japanese Patent No. 136901, instead of the lead wire,
Proposing a small vibration motor that allows the energizing terminals to be electrically connected to the power supply unit on the device body side simply by positioning the motor when the motor is mounted on the device body by protruding the spring plate-like energizing terminals from the motor. is doing.

[0004]

However, in the method disclosed in Japanese Unexamined Patent Publication No. 11-136901, one end of the current-carrying terminal is supported by a cantilever and the other end is formed into a free end shape, so that the elastic force of the spring is increased. However, there is a problem that the free end is easily deformed and the reliability of the electrical connection is insufficient.

Further, in the actual product of this small vibration motor, the diameter of the vibration motor is about 4 to 5 mm, the width of the spring-plate-shaped energizing terminal is about 1 to 2 mm, and the tip of the free end-shaped energizing terminal is Has a small mountain-shaped protrusion, and the protrusion is electrically connected to the power supply unit on the device body side in a substantially point-contact state.

However, since the current-carrying terminals are plate-shaped, there is a problem that space is taken up by the width of the plate and the cost is increased. In addition, if the device body is accidentally dropped, the impact thereof causes the free end portion of the current-carrying terminal to be shaken, resulting in unstable electrical connection between the projection of the current-carrying terminal and the power supply unit. In order to prevent this, in Japanese Unexamined Patent Publication No. 2000-78790, a motor is attached to the main body of the device via an elastic member, and the energizing terminal is pressed by a pressing body that projects from a part of the elastic member. However, there is a problem that the structure of the elastic member becomes complicated and the cost increases.

The present invention is to solve the above-mentioned conventional problems, and is a small vibration capable of easily and reliably making an electrical connection between a current-carrying terminal of a motor and a power-supplying section on the main body of a device at low cost. The purpose is to provide a motor.

[0008]

In order to achieve the above object, a small vibration motor according to claim 1 of the present invention includes a motor case having a rotary shaft, a stator, a rotor and a commutator therein, and In a small vibration motor having an eccentric weight fixed to one end of a rotating shaft, a brush base mounted on an open end of a motor case, a pair of brushes fixed to the brush base and contacting the commutator, and A terminal block formed integrally with the brush block and abutting on the peripheral surface of the motor case, a pair of parallel guide grooves formed in the terminal block, and a pin-shaped current-carrying terminal fitted in the guide groove. 3. The invention according to claim 2, further comprising: a contact portion formed on the pin-shaped energizing terminal and protruding outward from the guide groove to electrically connect the pin-shaped energizing terminal and the brush. Claim 1
In, a brush holder fixed to one end of the brush, and a through hole formed in the brush base, the brush holder and the pin-shaped energizing terminal is inserted into the through hole to electrically connect the two. The invention according to claim 3 is characterized in that, in claim 1 or 2, the pin-shaped current-carrying terminal is bent into a substantially U-shape to form a parallel electrode, and the parallel electrode is fitted in the guide groove. It is characterized by the combination.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of a small vibration motor of the present invention, FIG. 1 (A) is a plan view, and FIG. 1 (B).
Is a front view, FIG. 1 (C) is a left side view, and FIG. 1 (D) is a right side view.

The small vibration motor 1 is a cylindrical motor case 2
In the motor case 2, a conventionally known stator in which a magnet is assembled, a rotary shaft rotatably disposed inside the stator, and a commutator fixed to one end of the rotary shaft are provided. And a rotor electrically connected to the commutator and fixed to the rotary shaft.

As shown in FIG. 1, an eccentric weight 3 is fixed to the other end of the rotary shaft, and power is supplied to the commutator at the open end of the motor case 2 opposite to the eccentric weight 3. The power feeding unit 4 is attached and fixed. The power feeding unit 4 has a substantially L-shape when viewed from the side, and includes a brush base 4a attached to the open end of the motor case 2 and a terminal base 4b part of which abuts on the arc surface of the motor case 2. The base 4a and the terminal base 4b are integrally formed of an insulating material.

A pair of parallel guide grooves 4c, 4c are formed in the terminal block 4b of the power feeding unit 4 along the axial direction x of the motor 1. A pin-shaped conducting terminal 5 having a circular cross section is fitted and arranged along the inside of the guide groove 4c. The width of the guide groove 4c is slightly larger than the diameter of the pin-shaped energizing terminal 5. The pin-shaped energizing terminal 5 has a free end portion 5a, one end of which is fitted into the guide groove 4c, and a guide groove 4
It has a contact portion 5b that projects outward from the guide groove 4c at a substantially central portion of c.

FIG. 2 is an exploded view of the power supply unit 4 of FIG. 1, FIG. 2 (A) is a brush assembly, FIG. 2 (B) is a brush stand and terminal block, and FIG. FIG. 3 (A) is a front view of the terminal, and FIG. 3 is an assembly view of each part of FIG.
Is a front view, and FIG. 3 (B) is a sectional view taken along line BB of FIG. 3 (A).

In FIG. 2A, a pair of brush assemblies 6 comprises a brush 7 having a substantially V-shape that contacts the commutator.
And a brush holder 9 fixed to one end of this brush 7.
The other end of the brush 7 is elastically contacted with the commutator.
The brush holder 9 is provided with a horizontal connecting portion 9a.

In FIG. 2C, the end of the pin-shaped current-carrying terminal 5 on the side opposite to the free end 5a is folded back into a substantially U shape as shown in FIG. Are formed.

In FIG. 2B, the power feeding member 4 is provided with the brush base 4a, the terminal base 4b, and the pair of guide grooves 4c as described above. The brush base 4a has an insertion groove 4d into which the brush 7 and the brush holder 9 are inserted, a connecting portion 9a of the brush holder 9 and a connecting portion 5c of the pin-shaped energizing terminal 5.
Is formed with a through hole 4e having a convex cross section.

A method of assembling the power feeding unit 4 having the above structure will be described with reference to FIG. First, when the connecting portion 9a of the brush holder 9 is inserted into the engaging hole 4e of the brush base 4a, the brush 7 and the brush holder 9 are inserted into the insertion groove 4d.
It is engaged and fixed inside. Next, the pin-shaped energizing terminal 5 is moved from the back surface of the brush base 4a (see FIG. 1D) along with the free end portion 5a along the guide groove 4c, and the connecting portion 5c is formed.
Is inserted into the through hole 4e, the connecting portion 5c of the pin-shaped current-carrying terminal 5 and the connecting portion 9a of the brush holder 9 are engaged with each other to electrically connect the two.

4A and 4B show an example of mounting the small vibration motor having the above-mentioned configuration to a portable communication device. FIG. 4A is a view seen from the left side of FIG. 4B, and FIG. It is a longitudinal cross-sectional view.

A rubber cover 10 is mounted around the motor case 2 except for the terminal block 4b, and the motor case 2 is fixed to the device body 11 via the rubber cover 10. At that time, the circuit board 1 is arranged so that the power supply pattern 13 of the circuit board 12 and the contact portion 5b of the pin-shaped energizing terminal 5 come into contact with each other.
When 2 is pressed against the motor case 2 in the direction of the arrow in the figure, the contact portion 5b of the pin-shaped energizing terminal 5 sinks and the free end 5a slides along the guide groove 4c to the position 5a ', and the pin-shaped energizing terminal 5 , The free end 5a 'and the opposite end 5d
Since the contact portion 5b is pressed against the power feeding pattern 13 by the elastic force in the vertical direction in the guide groove 4c, the pair of pin-shaped conducting terminals 5 are fitted in the guide groove 4c. Therefore, there is no tilt and parallelism between the pin-shaped current-carrying terminals is maintained, and the electric connection between the current-carrying terminal 5 and the power supply unit 13 on the device body side can be reliably performed. The rubber cover 10 may be omitted.

FIG. 5 shows another embodiment of the small vibration motor of the present invention. FIG. 5 (A) is a plan view, FIG. 5 (B) is a sectional view, and FIG. 5 (C) is a right side view. . It should be noted that the same components as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the present embodiment, the pin-shaped energizing terminal 5 located in the guide groove 4c is bent into a substantially U shape to form the parallel electrode 5d, and the parallel electrode 5d is fitted in the guide groove 4c. ing. According to the present embodiment, two contact portions 5b are formed on each of the pair of pin-shaped energization terminals 5 and 5, so that when the contact portions 5b are attached to the mobile communication device, the electrical connection to the power feeding pattern is further improved. It can be done reliably.

[0022]

As is apparent from the above description, according to the present invention, a motor case having a rotary shaft, a stator, a rotor and a commutator therein and an eccentric weight fixed to one end of the rotary shaft. In a small vibration motor including: a brush base mounted on an open end of the motor case; a pair of brushes fixed to the brush base and contacting the commutator; and a motor case integrally formed on the brush base. A terminal block abutting on the peripheral surface of the terminal block, a pair of guide grooves formed in the terminal block, a pin-shaped energizing terminal fitted in the guide groove, and the guide formed on the pin-shaped energizing terminal. Since the pin-shaped energizing terminal and the brush are electrically connected to each other by providing the contact portion protruding outward from the groove, the electric connection between the energizing terminal of the motor and the power feeding portion on the device body side can be easily performed at low cost. And it can be performed reliably. In addition, since the pin-shaped energizing terminal is supported at two points, the contact part is pressed against the power-supplying part on the device body side by the vertical elastic force in the guide groove when assembled, and also the pair of pin-shaped energizing terminals are energized. Since the terminals are fitted in the guide grooves, there is no fall and the parallelism between the pin-shaped current-carrying terminals is maintained, and the electric connection between the current-carrying terminals and the power supply unit on the device body side can be reliably performed.

[Brief description of drawings]

FIG. 1 shows an embodiment of a small vibration motor of the present invention,
1A is a plan view, FIG. 1B is a front view, and FIG.
Is a left side view, and FIG. 1D is a right side view.

2 is an exploded view of the power feeding unit of FIG. 1, FIG.
2A is a front view of a brush assembly, FIG. 2B is a front view of a brush base and a terminal base, and FIG.

3A and 3B are assembly diagrams of the respective parts of FIG. 2, FIG. 3A being a front view and FIG. 3B being a cross-sectional view taken along line BB of FIG. 3A.

FIG. 4 shows an example of mounting the small vibration motor of FIG. 1 to a portable communication device, FIG. 4 (A) is a view seen from the left side of FIG. 4 (B), and FIG. 4 (B) is a longitudinal sectional view. Is.

5 shows another embodiment of the small vibration motor of the present invention, FIG. 5 (A) is a plan view, FIG. 5 (B) is a sectional view, and FIG.
(C) is a right side view.

[Explanation of symbols]

2 ... Motor case 3 ... Eccentric weight 4 ... Power supply unit 4a ... Brush stand 4b ... Terminal block 4c ... Guide groove 4e ... through hole 5 ... Pin-shaped energizing terminal 5b ... contact part 7 ... Brush 9 ... Brush holder

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomohide Aoyagi             3-8-22 Nitta, Adachi-ku, Tokyo Namiki             Mitsuge Co., Ltd. F term (reference) 5D107 AA09 AA11 BB08 CC09 FF08                 5H605 AA08 BB05 BB09 CC03 CC06                       DD09 EA02 EA04 EA23 EC07                       EC08 GG01                 5H613 AA01 AA02 BB04 BB14 BB37                       PP02 PP03

Claims (3)

[Claims] 1. A small vibration motor equipped with a motor case having a rotating shaft, a stator, a rotor and a commutator inside, and an eccentric weight fixed to one end of the rotating shaft, mounted on the open end of the motor case. Brush base, a pair of brushes fixed to the brush base and contacting the commutator, a terminal base integrally formed on the brush base and abutting on the peripheral surface of the motor case, and the terminal base A pair of parallel guide grooves, a pin-shaped conducting terminal fitted in the guide groove, and a contact portion formed on the pin-shaped conducting terminal and protruding outward from the guide groove, A small vibration motor characterized by electrically connecting a pin-shaped energizing terminal and a brush. 2. A brush holder fixed to one end of the brush, and a through hole formed in the brush base. The brush holder and the pin-shaped current-carrying terminal are inserted into the through hole to electrically connect them. The small vibration motor according to claim 1, wherein 3. The miniature according to claim 1, wherein the pin-shaped current-carrying terminal is bent into a substantially U shape to form a parallel electrode, and the parallel electrode is fitted in the guide groove. Vibration motor.