JPH0923610A - Oscillation motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an oscillation motor which can produce a high torque using an air core coil as a drive coil while facilitating connection between the drive coil and an external circuit. SOLUTION: The oscillation motor comprises a plurality of air core coils arranged while being shifted to one side of a rotor 10. The air core coil comprises a first air core coil part 3a and a second air core coil part superposed thereon wherein the first and second air core coil parts 3a, 3b are connected electrically at the inner circumferential part thereof, and electrodes for external connection are formed at the outer circumferential part of first and second air core coil parts 3a, 3b. The first and second air core coil parts 3a, 3b may be shifted from each other in the circumferential direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration motor in which a plurality of air-core coils are eccentrically arranged on one side of a rotor. For example, a pager or the like vibrates when an individual call signal is received. It can be used for applications such as issuing a notification.

[0002]

2. Description of the Related Art In a pager or the like, a vibration motor for generating vibration by rotation may be used as one means for informing that an individual call signal has been received. In order to generate vibration due to the rotation of the motor, an eccentric plate with a decentered center of gravity may be provided on the output shaft of the motor, but in order to reduce the thickness and reduce the current consumption, a plurality of drive coils are installed in the rotor. It is proposed to displace it on one side of. Actual Kaihei 2-33573
The example described in Japanese Patent Publication is an example, and this is shown in FIGS. 8 and 9.

In FIGS. 8 and 9, reference numeral 30 indicates a vibration motor. The vibration motor 30 includes a cup-shaped case 36 and an end plate 31 that covers the open end of the case 36.
An oil-impregnated bearing 32, 35 press-fitted and fixed in the center hole of the case 36 and the end plate 31, a rotary shaft 33 rotatably supported by the oil-impregnated bearing 32, 35, and an oil-impregnated bearing 3
A boss 34 that is integrally provided on the rotary shaft 33 between 2 and 35, a rotor holder 21 that is integrally molded on the outer peripheral side of the boss 34 with resin, and three drive coils 23 embedded in the rotor holder 21. And a brush 3 provided near the center of rotation on the lower surface side of the rotor holder 21.
7 and the brush 37 fixed to the inner surface of the end plate 31.
And a flat ring-shaped magnet 39 fixed to the inner surface of the end plate 31 so as to face the drive coil 23. The three drive coils 23 are arranged on the rotor holder 21 so as to be offset from the rotation shaft 33, and when the rotor 30 is rotationally driven, vibration is generated due to an imbalance in weight thereof.

The drive coils 23 are energized via the commutator 38 and the brush 37, and the drive coils 23 are switched in accordance with the rotational position of the rotor 30 to continuously rotate the rotor 30. be able to. When the rotor 30 is rotationally driven, the vibration is generated as described above.

According to the conventional vibration motor described above,
By arranging the plurality of drive coils 23 in the rotor holder 21 in a biased manner, the rotor itself is unbalanced and vibration is generated. Therefore, a new component is added to unbalance the weight distribution of the rotor. It is possible to obtain a highly efficient vibration motor that does not need to be formed and is thin and consumes less current.

[0006]

However, according to the above-mentioned conventional vibration motor, a so-called slice is formed by winding a copper foil having an insulating layer formed on at least one surface side an appropriate number of times and slicing this into an appropriate thickness. When the drive coil is composed of coils, the slice coil does not have a leader wire,
In particular, it is difficult to pull out the electrode on the inner peripheral side of the coil.

The present invention has been made in order to solve the above problems of the prior art. When using an air-core coil as the drive coil, the connection between the drive coil and an external circuit is easy and a large size is achieved. An object is to provide a vibration motor that can obtain torque.

[0008]

According to the first aspect of the present invention,
In a vibration motor in which a plurality of air-core coils are eccentrically arranged on one side of a rotor, the air-core coil includes a first air-core coil part and a second air-core coil part superposed on the first air-core coil part. The first air-core coil portion and the second air-core coil portion are electrically connected to each other at their inner peripheral portions, and are externally connected to the outer peripheral portion of the first air-core coil portion and the outer peripheral portion of the second air-core coil portion. It is characterized in that a connection electrode is formed. As in the invention described in claim 2, the first air-core coil portion and the second air-core coil portion may be arranged so as to be offset from each other in the circumferential direction.

[0009]

According to the present invention, since the plurality of air-core coils are eccentrically arranged on one side of the rotor, when the rotor is rotationally driven, vibration is generated due to an imbalance in the weight distribution of the rotor. The air-core coil is composed of a first air-core coil section and a second air-core coil section which is superposed on the first air-core coil section, and the first air-core coil section and the second air-core coil section are provided in the inner peripheral portion. The electrical connection increases the substantial number of turns of the drive coil. In addition, the inner peripheral portions of the first air-core coil portion and the second air-core coil portion that are overlapped with each other are connected to each other, and the outer peripheral portions of the first air-core coil portion and the second air-core coil portion are connected to each other. It is energized. First air core coil section and second
It is not necessary to connect the electrode on the inner peripheral side of the air-core coil section of 1 to the external circuit.

According to the second aspect of the present invention, the superposed first air-core coil portion and second air-core coil portion are circumferentially displaced so that a part of the inner peripheral portion thereof overlaps. Therefore, it is substantially the same as one drive coil being skewed and arranged, and the rotor itself rotates smoothly.

[0011]

Embodiments of the vibration motor according to the present invention will be described below with reference to FIGS. 1 to 4, reference numeral 10 indicates a rotor of the motor.
The rotor 10 mainly includes a holder 1 integrally molded of resin. The holder 1 has a plurality of concave portions 2
Is formed, and a drive coil is embedded in each recess 2. Each drive coil is an air-core coil in which the winding is flatly wound in a trapezoidal shape, and is composed of a first air-core coil portion 3a and a second air-core coil portion 3b superposed on the first air-core coil portion 3a. Has been done. The first air-core coil portion 3a and the second air-core coil portion 3b are overlapped with each other in the circumferential direction so that the inner peripheral portions of the first air-core coil portion 3a and the second air-core coil portion 3b overlap each other. The amount by which the first air core coil portion 3a and the second air core coil portion 3b are displaced in the circumferential direction is such that the first air core coil portion 3a and the second air core coil portion 3b are one drive coil. It is limited within the range that does not impair the function of.

The rotor 10 is a rotor for a vibration motor used for informing that a pager or the like has received an individual call signal, and the holder 1 has a rotary shaft (not shown) inserted therein. The first air-core coil portion 3 is formed asymmetrically with respect to the shaft hole 7.
Three sets of drive coils 3 each including a and the second air-core coil portion 3b are arranged in the holder 1 in a biased manner. A commutator is formed on the boss portion around the shaft hole 7, but it is not shown.

The second air-core coil portion 3b is turned upside down and overlapped with the first air-core coil portion 3a. First air core coil portion 3a and second air core coil portion 3b
Have electrodes on the inner circumference side of the winding start and the outer circumference side of the winding end, respectively, and are overlapped with the first air-core coil section 3
The electrodes a on the inner peripheral side of the second air-core coil portion 3b are connected to each other by the solder 4. Further, the electrodes on the outer peripheral portions of the first air-core coil portion 3a and the second air-core coil portion 3b serve as external connection electrodes. In this way, the second air-core coil portion 3b is turned upside down and overlapped with the first air-core coil portion 3a, and the electrodes on the inner peripheral side of each air-core coil portion are electrically connected. In addition, since the electrodes on the outer peripheral side of each air-core coil portion are electrodes for external connection, the electrodes for external connection on one air-core coil portion to the electrodes on the inner peripheral side, and then on the other side. A drive current can flow in the same direction in the first air core coil portion 3a and the second air core coil portion 3b from the electrode on the inner peripheral side of the air core coil portion to the electrode for external connection.

A lead frame (not shown) is integrally provided on the holder 1 by insert molding or the like.
The external connection electrode of the first air-core coil section 3a is solder 5
Is electrically connected to the soldering land of the lead frame, and the external connection electrode of the second air core coil portion 3b is electrically connected to the soldering land of the lead frame by the solder 6. The lead frame is connected to an external circuit via a flexible circuit board (not shown). Electrical connection between the inner electrodes of the first air-core coil section 3a and the second air-core coil section 3b, and electrical connection between the external connection electrode of the first air-core coil section 3a and the solder land. Connection, and electrical connection between the external connection electrode of the second air-core coil portion 3b and the soldering land can be easily performed, for example, by soldering in a state in which they are bridged with a conductor wire covered with solder. Can be connected to.

Each of the drive coils of the rotor 10 having the first air-core coil portion 3a and the second air-core coil portion 3b is shown in the same manner as in the conventional example shown in FIGS. 8 and 9. It is arranged so as to face the magnet on the stator side, which is not formed, and constitutes a relatively flat motor. As is well known, by energizing each drive coil via a commutator or a brush, and switching the energization to each drive coil according to the rotational position of the rotor 10, the rotor 10 can be continuously driven to rotate. . As described above, since the three drive coils are arranged in the holder 1 in a biased manner, when the rotor 10 is rotationally driven, vibration is generated due to the imbalance of the weight thereof.

According to the embodiment described above, the first air core coil 3 in which one driving coil is superposed on each other is used.
Since it is composed of a and the second air-core coil 3b, there is an advantage that the number of windings of the drive coil is substantially increased and the torque is increased. Further, one drive coil is composed of the first air-core coil portion 3a and the second air-core coil portion 3 which are superposed on each other.
The first air-core coil is electrically connected on the inner peripheral side of b, and the external connection electrodes are formed on the outer peripheral portions of the first air-core coil portion 3a and the second air-core coil portion 3b. It is not necessary to connect the electrodes on the inner peripheral side of the first air core coil section and the second air core coil section to an external circuit, and the first air core coil section and the second air core coil section are configured by the so-called slice coil described above. Even in this case, there is an advantage that the connection between the drive coil and the external circuit becomes easy.

Further, since the first air core coil portion and the second air core coil portion are displaced in the circumferential direction so that a part of the inner peripheral portion thereof overlaps, one drive coil is skewed. Is substantially the same as that of the rotor 10, and there is an advantage that the torque unevenness is reduced and the rotation of the rotor 10 itself becomes smooth.

In the embodiment described above, three drive coils were used as the drive coils, but the number of drive coils is arbitrary, and the point is that a plurality of drive coils constituting the drive coils are provided on one side of the rotor. It is sufficient if they are eccentrically arranged. Further, the first air-core coil portion and the second air-core coil portion that form the drive coil do not necessarily need to be arranged so as to be displaced from each other in the circumferential direction, and are shown in FIGS. 5, 6, and 7. You may comprise like an example. Hereinafter, modified examples of the present invention shown in FIGS. 5, 6 and 7 will be described.

In the embodiment shown in FIGS. 5 and 6, two drive coils are used as the drive coils, and each drive coil is superposed on the other of the first air core coil portion 3a and the second air core coil portion 3b. In addition, the first air-core coil portion 3a and the second air-core coil portion 3b are superposed at exactly the same position without being displaced from each other in the circumferential direction. Of course, the two drive coils are eccentrically arranged on one side of the rotor, and generate vibrations when driven to rotate. A first air-core coil portion 3a and a second air-core coil portion 3 which form a drive coil
In b, the electrodes of the inner peripheral portion are electrically connected by the solder 4, and the first air core coil portion 3a and the second air core coil portion 3 are
The external connection electrode formed on the outer peripheral portion of b is connected to the external circuit. Therefore, both of the electrodes for external connection are located on the outer peripheral side, which facilitates the wiring process and the like in the holder 1.

In the embodiment shown in FIG. 7, two drive coils are used as the drive coils as described above, and each drive coil is
A first air-core coil section 3a and a second air-core coil section 3b which are superposed on each other, wherein the first air-core coil section 3a and the second air-core coil section 3b are circumferentially arranged with respect to each other. They are arranged in a staggered manner, and are substantially the same as those in which one drive coil is skewed as described above, and torque unevenness is reduced to smooth the rotation of the rotor itself.

The method of manufacturing the air core coil is not particularly limited. As described above, a so-called slice coil formed by winding an appropriate number of turns of a copper foil having an insulating layer formed on at least one surface side and slicing this into an appropriate thickness may be used, or a circular cross section or a rectangular cross section. Alternatively, a magnet wire having an appropriate sectional shape may be wound.

[0022]

According to the invention described in claim 1, since one drive coil is composed of the first air-core coil portion and the second air-core coil portion which are superposed on each other, the drive coil This has the advantage of substantially increasing the number of windings and increasing the torque. In addition, one drive coil is electrically connected to the first air-core coil portion and the second air-core coil portion that are overlapped with each other on the inner peripheral side, and is connected to the first air-core coil portion and the second air-core coil portion.
Since the external connection electrode is formed on the outer peripheral portion of the air-core coil portion, it is not necessary to connect the electrodes on the inner peripheral side of the first air-core coil portion and the second air-core coil portion to the external circuit. Even when the first air-core coil section and the second air-core coil section are so-called slice coils, there is an advantage that the drive coil and the external circuit can be easily connected.

According to the second aspect of the present invention, the superposed first air-core coil and second air-core coil are shifted in the circumferential direction so that a part of the inner peripheral portion thereof overlaps. The arrangement is substantially the same as that where one drive coil is skewed and arranged, and there is an advantage that torque unevenness is reduced and the rotation of the rotor itself becomes smooth.

[Brief description of drawings]

FIG. 1 is a plan view showing a rotor portion of an embodiment of a vibration motor according to the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG.

3 is a sectional view taken along the line BB in FIG.

FIG. 4 is a cross-sectional view taken along the vertical centerline of FIG.

FIG. 5 is a plan view showing a modified example of a rotor portion applicable to the present invention.

FIG. 6 is a front view of the same rotor portion.

FIG. 7 is a plan view showing still another modified example of the rotor portion applicable to the present invention.

FIG. 8 is a plan view showing an example of a rotor of a conventional vibration motor.

FIG. 9 is a cross-sectional view showing an example of a conventional vibration motor using the same rotor.

[Explanation of symbols]

 3a air core coil 3b air core coil 4 solder which is an electrical connection 10 rotor

Claims (2)

[Claims] 1. A vibration motor in which a plurality of air-core coils are eccentrically arranged on one side of a rotor, wherein the air-core coil is a first air-core coil portion and a second air-core coil portion superposed on the first air-core coil portion. A core coil portion, wherein the first air-core coil portion and the second air-core coil portion are electrically connected at an inner peripheral portion thereof, and an outer peripheral portion of the first air-core coil portion and a second air-core coil portion. A vibration motor, wherein an external connection electrode is formed on the outer peripheral portion of the core coil portion. 2. The vibration motor according to claim 1, wherein the first air-core coil portion and the second air-core coil portion are arranged so as to be offset from each other in the circumferential direction.