JPH05305270A - Oscillation actuator - Google Patents

Abstract

PURPOSE:To be entirely free from defects such as disconnection, property change and deterioration of wire material as well as coil fixing problems are eliminated by inputting an alternating frequency to one end of a coil and thereby detecting the sensing of a counter-oscillation action by a permanent magnet, using the other coil to allow the negative feedback of the detected sensing to an alternating frequency generation circuit. CONSTITUTION:A sector flat plate-like oscillator 1 of non-magnetic material is supported by a shaft 2 so that it can rotate horizontally. In addition, a permanent magnet 3 with N/S poles magnetized in a peripheral direction, is fixed in the center of a sector periphery. The oscillator 1 is rendered in a stretched condition by attaching a controlling coil spring 4. Further, a bifilar-wound oscillation coil 5, wound around a pole piece 6, is firmly fixed to the part, in a peripheral direction, of an oscillation body so that the oscillation coil 5 is positioned opposite to the permanent magnet 3 part through a space. The alternating frequency is entered to one end of the coil 5 from an oscillation device to allow the oscillation body to oscillate. Thus the sensing of a counter-oscillation action caused by the permanent magnet is detected using the other coil 5, so that the detected sensing is returned to achieve a feedback to an alternating frequency generation circuit. Consequently an oscillation frequency is synchronized with the resonance frequency of the oscillation body.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is incorporated in a pager of a small portable telephone, and is used as a vibrating body which informs that there is a telephone call by vibration instead of ringing sound of the telephone. Yes, it can be applied as a mechanism that vibrates flatly by being used especially for small and thin pagers.

[0002]

2. Description of the Related Art Conventionally, a weight (counterweight) 8 eccentric to a rotary shaft 7 of a small DC motor as shown in FIG.
Etc., or in the case of (b), the core of the armature 9 itself is notched or the coil 10 is lacked to make it unbalanced, and it is rotated in response to a call signal of the telephone to generate a vibration force. A technique is known in which a human body is sensed by the vibration to notify that there is a calling signal.

[0003]

Such a structure requires the size or length of the outer diameter of the vibrating motor and uses the commutator of the rotating portion and the contact portion around the brush, which causes malfunctions during rotation. It often happens, and flat type motors also have similar defects, so it is difficult to develop a smaller and flatter pager, and especially for flattened shapes with an outer diameter of 20 mm or less and a thickness of a few mm. A vibration mechanism that can be used for pagers and has a vibration force that can be sensed by the human body has not been developed.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a vibrating body is rotatably supported, a permanent magnet is fixed to a part of the vibrating body, and a restoring spring is attached to the vibrating body. The bifilar wound oscillation coil is placed and fixed to face each other through the air gap, the alternating frequency is input to one of the coils, and the sensing of the anti-oscillation operation of the permanent magnet by this is detected by the other coil, and the negative feedback is made to the alternating frequency generation circuit. The vibration actuator is characterized in that the oscillating coil is arranged at the outer peripheral facing portion of the vibrating body and the vibrating actuator is arranged at the surface facing portion of the vibrating body.

In the internal structure of the case of the magnetic case made of flat iron soft iron or low carbon steel with a closed magnetic path, the vibrating body is made of a non-magnetic material such as aluminum, resin or high specific gravity heavy metal. When used in a fan shape, it also acts as a counterweight. A permanent magnet magnetized with N and S poles is arranged at the center of the fan-shaped and plate-shaped vibrating body. The coil is bifilar wound, and two coils can be wound on one coil at the same time.
One coil is wound, one coil is for driving, and the other coil is for synchronization, and it has a bobbinless structure and is attached and fixed to the inner surface of the inside of the housing or the lower surface inside the housing. This is advantageous in assembly such as assembly and coil lead wire processing, and the quality can be stabilized. A tension spring or a spiral spring is used as the spring attached to the vibrating body depending on the mounting shape of the coil.

[0006]

Embodiment 1 FIG. 1 is an embodiment of the present invention, in which a fan-shaped plate-shaped vibrator 1 made of a non-magnetic material is supported by a shaft 2 so as to be rotatable left and right. A permanent magnet 3 having an NS pole magnetized in the circumferential direction is fixedly attached thereto. A restoring coil spring 4 is attached to the vibrator 1 and is in a tensioned state. The bifilar wound oscillating coil 5 is wound around the pole piece 6 around this permanent magnet portion with a gap, and is fixedly arranged opposite to the outer peripheral facing portion of the vibrating body, and an alternating frequency of 900 Hz is input from the oscillator to one of the coils 5 to vibrate. Vibrate the body. The resonance frequency of this vibrating body is 300 Hz.The oscillation frequency and the resonance vibration of the vibrating body are detected by detecting the anti-oscillation operation of the permanent magnet by the other coil and feeding it back negatively to the alternating frequency generation circuit. Numbers are in sync. Figure 3
Is an example of an oscillator circuit, and the driving coil is L1 and the synchronizing coil is L2.

[0007]

[Embodiment 2] FIG. 3 shows another embodiment of the present invention in which a fan-shaped plate-shaped vibrator 1 formed of a non-magnetic material is supported by a shaft 2 so as to be rotatable left and right. A permanent magnet 3 having an NS pole magnetized in the circumferential direction is fixed to the center of the surface. A restoring spiral spring 4 is attached to the vibrator 1. The bifilar wound oscillation coil 5 is wound around the pole piece 6 with a gap between the permanent magnet portion and fixed to face the portion of the vibrating body so as to face the vibrating body.
Enter the alternating frequency of Hz to vibrate the vibrating body. The resonance frequency of this vibrating body is 350 Hz.The resonance frequency of the vibrating body and the resonance frequency of the vibrating body are detected by detecting the anti-oscillation operation of the permanent magnet by the other coil and feeding it back negatively to the alternating frequency generating circuit. Numbers are in sync. FIG. 3 shows an example of an oscillator circuit.

[0008]

As described above, according to the present invention, it is sufficient to simply embed a permanent magnet without winding a coil on the vibrator itself, which is a movable part, and dispose the coil on the fixed part. Cutting wire due to vibration during the period,
There are no defects such as alteration and deterioration.

[Brief description of drawings]

FIG. 1 is a plan view (a) of an embodiment of a vibration actuator of the present invention and a sectional view (b) taken along line AA ′.

FIG. 2 is a perspective view of a conventional vibration motor.

FIG. 3 is an oscillator circuit diagram.

FIG. 4 is a plan view (a) and a sectional view (b) taken along line BB ′ of another embodiment of the vibration actuator according to the present invention.

[Explanation of symbols]

 1 Flat vibrator 2 Axis 3 Permanent magnet 4 Spring for restoration 5 Oscillation coil 6 Pole piece

Claims (3)

[Claims] 1. A vibrating body is rotatably supported, a permanent magnet is fixed to a part of the vibrating body, and a restoring spring is attached.
On the other hand, a bifilar wound oscillation coil is opposed to and fixed to this permanent magnet portion through a gap, an alternating frequency is input to one of the coils, and the sensing for anti-oscillation operation of the permanent magnet is detected by the other coil. And a negative feedback to the alternating frequency generating circuit. 2. The vibration actuator according to claim 1, wherein the oscillating coil is arranged in a portion of the vibrating body facing the outer circumference. 3. The vibration actuator according to claim 1, wherein the oscillating coil is arranged in a surface facing portion of the vibrating body.