JP2003033724A - Electrical-mechanical oscillation converter and small- sized portable device with the same built-in - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrical-mechanical oscillation generator built-in a small-sized portable device for use, wherein a coil fixed against a frame in place and a magnetic circuit section resiliently supported by a suspension against the frame are provided, and the magnetic circuit section as an oscillation section generates an oscillation by disposing the coil at a magnetic gap in the magnetic circuit, an oscillation energy is increased by increasing the mass of an oscillation section while keeping constant the volume of the oscillation section to obtain the various action modes of an oscillation. SOLUTION: In a device with an outer type magnetic circuit provided with a pole piece 2 and a circular magnet 3, a high-specific gravity material which is filled in a hollow section inside a center pole is allowed to be a weight 9. In a device with an inner type magnetic circuit provided with a yoke and a short cylindrical magnet, an extra thickness of the yoke periphery is increased to function as a weight or a high-specific gravity circular weight is separately manufactured and is fixed at the yoke periphery in place. As drive methods, an electric power is supplied by switching the divided frequency output of an oscillation frequency, the low path filter output of a music signal, the signal intensity detector output of the music signal or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a mobile communication device such as a mobile phone or a pager to notify the user of an incoming call by vibrating, or is incorporated in a small portable terminal or a small game console to experience vibration. The present invention relates to an electro-mechanical vibration converter.

[0002]

2. Description of the Related Art These portable devices are configured to be switched to use a buzzer sound or a melody sound to notify the user of an incoming call, or to generate vibration without sound due to consideration of the surroundings. Therefore, a structure has been adopted in which a sounding body for generating sound and an electro-mechanical vibration converter for generating vibration are built in. Among these, the sounding body is a small speaker or a buzzer, while the electro-mechanical vibration converter (hereinafter, abbreviated as a vibrator) is a small motor in which an eccentric rotating body is fixed. An example of such a vibrator is found in, for example, Japanese Patent Application Laid-Open No. 7-107699, and when the motor is started by an incoming signal, the eccentric rotating body rotates, and its imbalance causes vibration.

[0003]

In the vibrator as described above, the motor is composed of parts such as a stator and a rotor, so that the structure is complicated and the cost is high, and the volume in which the motor and the eccentric rotating body are combined is large. May not be used for small devices. Further, since it is a DC motor, there are problems that the rotation speed is uniform and only monotonous vibration is obtained. The present invention solves these problems and realizes a vibrator which has a simple structure, is extremely small, and can generate musical vibrations accompanied by rhythm, strength, and the like.

[0004]

In order to solve the above problems, in the present invention, a permanent magnet and a yoke or a pole piece are combined to form a magnetic circuit portion having a magnetic gap, and a coil is arranged in this magnetic gap. . The coil is fixed to the coil support plate, while the magnetic circuit section is elastically supported by a suspension, which is a support spring, so that the coil can vibrate. With this structure, when an alternating signal current is applied to the coil, the magnetic circuit of the magnetic gap of the magnetic circuit section and the electromagnetic action of the coil current cause the magnetic circuit section to vibrate as a weight, while the coil is stationary. If the signal current is musical, including rhythm, strength, etc., it is reproduced and transmitted to the user.

Further, in the present invention, the mass of the magnetic circuit portion is maximized to increase the energy of vibration of the magnetic circuit portion. That is, the excess weight necessary for forming the magnetic path is added to the parts of the magnetic circuit section to make it a weight, or a weight of a material having a high specific gravity is separately made and added.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a vibrator according to the present invention, in which a magnetic circuit unit and a coil are housed in a frame 1 made of plastic or the like. The magnetic circuit portion is formed by fixing an annular magnet 3 on a flange 2a of a pole piece 2 made of a magnetic material, and an annular top plate 4 is also fixed to the upper end of the magnet 3 by a magnetic material. Magnet 3
A magnetic field is generated in the magnetic gap between the inner periphery of the top plate 4 and the outer periphery of the upper end of the center pole 2b of the pole piece 2 by the magnetomotive force of the coil 8, and the coil 8 is arranged in this magnetic gap.

The magnetic circuit portions of the pole piece 2, the magnet 3 and the top plate 4 are the upper suspension A (5).
And the lower suspension B (6)
Is supported by. For the sake of simplicity, the frame 1 is depicted as an integral structure in FIG. 1, but for convenience of insert molding two suspensions, they may be divided into two parts and joined together. On the other hand, the coil 8 is fixed to a coil supporting plate 7 made of plastic or the like, and the coil supporting plate 7 is joined to the frame 1. The protector 1 is provided on the lower surface of the frame 1.
0 are joined together and are provided with a plurality of vent holes.

When an alternating signal current is supplied to the coil 8 having such a structure, the magnetic circuit portion and the coil are subjected to an alternating force by mutual electromagnetic action, but the coil 8 is fixed to the coil support plate 7. Suspension, A, B
The magnetic circuit portion elastically supported by (5, 6) vibrates. Then, this vibration is transmitted to the housing of the mobile device in which the vibrator is incorporated, and causes the wearer to sense the vibration. If the signal current flowing through the coil 8 is a simple sine wave or the like, the vibration is simple, but if it is a music signal or the like, the vibration is accompanied by rhythm and strength.

Regarding the elastic support of the magnetic circuit section,
Basically, only one of the two suspensions A and B (5, 6) is required. However, with one suspension, the magnetic circuit section tilts during vibration due to asymmetry or imbalance of parts. There is a risk that the coil 8 may come into contact with the coil 8 and produce abnormal noise or be damaged. As shown in FIG. 1, if the two suspensions A and B (5, 6) are used to support the upper and lower suspensions, the magnetic circuit portion does not tilt and operates stably.

In order to obtain the maximum vibration energy with such a small vibrator, it is desirable to maximize the mass of the magnetic circuit section. Therefore, in the present invention, as shown in FIG. 1, the center pole 2b of the pole piece 2 is formed into a cylindrical shape while leaving a wall thickness necessary for the passage of magnetic flux, and a weight 9 is formed in the hollow portion.
Is filled. It is desirable that the material of the weight 9 has a high specific gravity, and tungsten is used as an example. Although the hollow portion of the center pole 2b is provided with a ceiling in this figure, it may be a through hole as a matter of course.

FIG. 2 is another embodiment of the present invention. Figure 1
2 is of an outer magnet type in which a ring-shaped magnet 3 is arranged outside the coil 8, whereas FIG. 2 is of an inner magnet type in which a short cylindrical magnet 12 is arranged inside the coil 8. . The magnet 12 is fixed to the bottom portion 11a of the magnetic material yoke 11, and a magnetic material top plate 13 is joined to the upper end of the magnet 12. The coil 8 is arranged in the magnetic gap between the inner periphery of the upper end of the outer periphery 11b of the yoke 11 and the outer periphery of the top plate 13, and the coil 8 is fixed to the coil support plate 7. Here again, the magnetic circuit section is supported on the frame 1 by the upper and lower suspensions A and B (5, 6).

The operation is the same as that described above. When a signal current is passed through the coil 8, the elastically supported magnetic circuit section vibrates and transmits the vibration to the wearer. Again, in order to increase the vibration energy, the mass of the magnetic circuit unit is increased. That is, even if the outer diameter 11b of the yoke 11 is up to the two-dot chain line 14 required to form the magnetic path, the outer circumference 11b is thickened to the outside as much as possible to increase the weight. It is more effective if the outer portion of the chain double-dashed line 14 is made of a material having a higher specific gravity than that of the yoke, such as tungsten, as a separate body, and is fixed to the yoke 11.

FIG. 4 is a block diagram of a sound and vibration generating mechanism of a small portable device in which the motor with the eccentric weight described in the section of the prior art is incorporated as a vibrating body. When the signal received by the antenna 21 enters the reception signal processing unit 22, an incoming signal is output, and the motor drive circuit 25 or the music signal generation unit 26 is operated according to the setting of the user. When it is set to be used in the acoustic mode, the music signal generating unit 26 is started to output the music signal, and the speaker 2 is passed through the amplifier 27.
8 or buzzer Bz is driven to generate a melody or a buzzer sound. When used in the vibration mode, the motor drive circuit 25 is started to rotate the DC motor M, and the eccentric weight attached to the DC motor M rotates to generate vibration. The reception signal output from the reception signal processing unit 22 drives the receiver 24 via the amplifier 23 to reproduce the voice.

FIG. 3 is a block diagram of the sound and vibration generating mechanism of a small portable device using the vibrator of the present invention. The reception signal processing unit 31 includes an oscillation circuit including a crystal oscillator 32, and generates a sinusoidal vibration φ. Received signal processing unit 3
When the sound mode is selected when 1 outputs an incoming signal, the music signal generator 35 is started to output a music signal, and the speaker 28 (or a buzzer or the like not shown) is driven via the amplifier 39. Then, a melody or a buzzer sound is generated. When the reception state is entered, the reception signal output from the reception signal processing unit 31 drives the receiver 24 via the amplifier 33.

On the other hand, when responding to the incoming signal in the vibration mode, several operations are possible. That is, the oscillation output φ of the crystal unit 32 is frequency-divided by the frequency divider 34 to 80 to 200.
The first is to vibrate the vibrator V at a frequency of Hz, which may be continued to vibrate uniformly or may be vibrated intermittently by taking the logical product of the divided waveform and the square wave. Next, the second is to drive the music signal generated by the music signal generation unit 35 through the low-pass filter 36 and rhythmically with the low frequency component. The third method is to drive the music signal through the signal strength detector 38 with the strength. These drive signals are switched by the switch SW, amplified by the amplifier 37, and added to the vibrator V. Such various operation modes cannot be obtained by the conventional structure of FIG.

[0016]

As is apparent from the above description, the present invention has a simple structure and low cost, and is suitable for a small portable device having a small volume, as compared with a conventionally used motor and a vibrating body using an eccentric mass. Since a high specific gravity material is used or a weight is added to the magnetic circuit unit that serves as the oscillating mass, the vibration energy can be increased even with a small size, and various operation modes of the vibration can be obtained. This makes it possible to obtain an inexpensive vibrator suitable for use in a vibration mode in a mobile phone or the like, and is also suitable for giving a realistic sensation due to vibration in a game program or the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an embodiment of an electro-mechanical vibration converter of the present invention.

FIG. 2 is a sectional view of another embodiment of the electro-mechanical vibration converter of the present invention.

FIG. 3 is a block diagram of a sound and vibration generating mechanism of a small portable device incorporating the electro-mechanical vibration converter of the present invention.

FIG. 4 is a block diagram of a sound and vibration generating mechanism of a small portable device incorporating a conventional motor with an eccentric weight.

[Explanation of symbols]

1 frame 2 pole pieces 2a flange 2b Center pole 3, 12 magnets 4,13 Top plate 5 Suspension A 6 Suspension B 7 Coil support plate 8 coils 9 weights 10 protector 11 York 21 antenna 22, 31 Received signal processing unit 23, 27, 33, 37, 39 Amplifier 24 receiver 25 Motor drive circuit 26,35 Music signal generator 28 speakers 32 crystal unit 34 frequency divider 36 low pass filter 38 Signal strength detector Bz buzzer M motor SW switch V vibrator

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H04R 9/10 H04R 9/10 F term (reference) 5D012 CA09 GA04 5D017 AA11 5D107 AA06 BB08 CC08 CC10 DD03 FF07 5H633 BB02 GG06 GG09 GG12 HH02 HH07 HH25 JB06

Claims (4)

[Claims] 1. A coil fixed to a frame and a magnetic circuit portion elastically supported to the frame by using a suspension are provided, and the coil is arranged in a magnetic gap forming a part of the magnetic circuit, whereby An electro-mechanical vibration converter in which a weight is added to the vibrating section in an electro-mechanical vibration converter that vibrates a circuit section as a vibrating section. 2. The electro-mechanical vibration converter according to claim 1, wherein the magnetic circuit is an outer magnet type including a pole piece, a ring-shaped magnet, and a top plate, the weight is a center pole of the pole piece. Electricity characterized in that the hollow portion provided is filled with a high specific gravity material
Mechanical vibration converter. 3. The electro-mechanical vibration converter according to claim 1, wherein the magnetic circuit includes a yoke having a disk-shaped bottom portion and a short cylindrical outer peripheral portion, a short cylindrical magnet and a top plate. In the magnetic type, the weight is a surplus portion provided outside the magnetic path on the outer peripheral portion of the yoke, or separately made from a high specific gravity material in an annular shape and fixed to the outer periphery of the yoke. Mechanical vibration converter. 4. Electricity according to claim 1 to 3.
A small portable device incorporating a mechanical vibration converter, wherein the electric-mechanical vibration converter is driven by a frequency division output of an oscillation frequency, a low-pass filter output of a music signal, or a signal intensity detector output of a music signal. A small mobile device configured to switch between and supply.