JP2000069736A - Oscillatory actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembling work by arranging an elastic material on a central shaft secured with a magnetic circuit and a damper thereby ensuring machining accuracy of the elastic material and suppressing deformation at the time of assembling. SOLUTION: A magnetic circuit is formed by clamping a permanent magnet disc 2 between a yoke 1 and a plate 3. A bolt-like central shaft 4 is passed through the central hole of a damper 8 and fitted in the central hole of the magnetic circuit. The damper 8 is shaped to have a plurality of spirals for supporting the magnetic circuit flexibly and integrated with a bobbin 13 for supporting a coil 5. An elastic material 9 is interposed between the central shaft 4 coupled with the magnetic circuit and a supporting base 10 and bonded to the central shaft 4. When a driving current is applied to the coil 5, the magnetic circuit supported flexibly by the damper 8 and a supporting rubber 12 oscillates to collide against the supporting base 10. Since the elastic material 9 is bonded to the central shaft 4 coupled with the magnetic circuit, noise can be suppressed upon collision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration actuator mounted on a mobile communication device such as a portable telephone and having a function of generating a ringing tone, voice, or vibration.

[0002]

2. Description of the Related Art A vibration actuator of this type is described, for example, in Japanese Patent Application No. 8-324997 (vibration actuator for pager). This conventional vibration actuator includes a magnetic circuit composed of a permanent magnet 2, a yoke 1, and a plate 3, as shown in FIG.

The magnetic circuit is supported by a support rubber 12 which is a flexible structure attached to a damper 8 and a claw-like projection 15 provided on a support base 14 so as to be movable up and down.

When a drive current is applied to the coil 5, the magnetic circuit moves up and down in the axial direction, and the coil 5 transmits vibrations to the outside through the damper outer peripheral portion 6 and the support base 14. .

The center shaft 4 is connected to the yoke 1 and the permanent magnet 2 and is connected to the damper 8.
Is to prevent the yoke 1 from directly colliding with the support 14.

[0006]

However, in the above-described conventional vibration actuator having such a structure, the yoke collision portion of the support base is suppressed in order to suppress the collision sound when the magnetic circuit collides with the support base during vibration. However, since the elastic material such as rubber is provided, it is difficult to ensure the processing accuracy of the part because the shape is a thin ring shape, and there is a problem that the deformation is large even during assembly.

Accordingly, an object of the present invention is to provide a vibration actuator which ensures processing accuracy of an elastic material, has less deformation during assembly, and is easy to assemble.

[0008]

According to the present invention, in order to solve these problems, the elastic member is formed into a small disk shape, and is bonded to a collision portion of a central shaft fixing a magnetic circuit and a damper by bonding or the like. By fixing the vibration actuator, the processing accuracy of the elastic material is ensured, and the deformation during assembly is reduced.

That is, according to the present invention, a magnetic circuit constituted by using a permanent magnet, a coil disposed in a gap of the magnetic circuit, and a damper which flexibly supports the magnetic circuit with respect to the coil. Having an electric signal input to the coil;
In a vibration actuator that generates vibration by moving the magnetic circuit up and down, an elastic material is provided on a center shaft that fixes the magnetic circuit and the damper.

[0010]

Embodiments of the present invention will be described below.

First, a first embodiment of the present invention will be described.

FIG. 1 is a sectional view of a vibration actuator according to a first embodiment of the present invention. In FIG. 1, a magnetic circuit is formed such that a disk-shaped permanent magnet 2 is sandwiched between a yoke 1 and a plate 3.

The center shaft 4 is shaped like a bolt, penetrates the center hole in the center of the damper 8, and is fitted into the center hole of the magnetic circuit. That is, the magnetic circuit and the damper 8 are positioned coaxially by the center shaft 4.

The damper 8 is formed to have a plurality of spiral shapes so as to flexibly support the magnetic circuit, and integrally has a bobbin 13 for supporting the coil 5.

The support base 10 has a plurality of claw-shaped protrusions 11 at the outer edge thereof, and a support rubber 12 is attached to the claw-shaped protrusions 11.

The support rubber 12 has a magnetic circuit,
It is assembled so as to flexibly support the magnetic circuit so as not to separate from the magnetic circuit.

The elastic member 9 is interposed between the center shaft 4 connected to the magnetic circuit and the support 10, and is bonded to the center shaft 4.

In such a configuration, when a drive current is applied to the coil 5, the magnetic circuit flexibly supported by the damper 8 and the support rubber 12 vibrates and collides with the support base 10.

At this time, since the elastic member 9 is adhered to the central shaft 4 connected to the magnetic circuit, the generation of unnecessary sound at the time of collision is suppressed.

Here, since the elastic member 9 is formed in a small disk shape, the processing accuracy can be ensured and the deformation at the time of assembly is small.

Next, another embodiment of the present invention will be described.

FIG. 2 is a sectional view of a vibration actuator according to another embodiment of the present invention. In FIG. 2, the center shaft 4 has a bolt-like shape similar to that of the first embodiment, penetrates the center hole in the center of the damper 8, and fits into the center hole of the magnetic circuit.

That is, the magnetic circuit is flexibly supported only by the damper 8, and the supporting rubber and the supporting base are omitted. Therefore, when the magnetic circuit vibrates, the center shaft 4 directly collides with the housing 7 via the elastic member 9.

At this time, similar to the vibration actuator of the first embodiment shown in FIG.
Generation of unnecessary sound at the time of collision is suppressed.

Here, as in the first embodiment, the elastic member 9 is formed in a small disk shape, so that the processing accuracy can be ensured and the deformation during assembly is small.

[0026]

As described above, according to the present invention, the elastic member is formed into a small disk shape, and is fixed to the collision portion of the central shaft fixing the magnetic circuit and the damper by bonding or the like. Since the processing accuracy of the elastic material can be ensured and the deformation at the time of assembly can be reduced, it is possible to provide a vibration actuator that is highly accurate and easy to assemble.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vibration actuator according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a vibration actuator according to another embodiment of the present invention.

FIG. 3 is a partially cutaway perspective view of an example of a conventional vibration actuator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Yoke 2 Permanent magnet 3 Plate 4 Central axis 5 Coil 6 Damper outer peripheral part 7 Housing 8 Damper 9, 19 Elastic material 10, 14 Support base 11, 15 Claw-like projection 12 Support rubber 13 Bobbin

Claims (1)

[Claims] A magnetic circuit configured by using a permanent magnet, a coil disposed in a gap of the magnetic circuit, and a damper that flexibly supports the magnetic circuit with respect to the coil;
In a vibration actuator that inputs an electric signal to the coil and moves the magnetic circuit up and down to generate vibration, an elastic material is provided on a central shaft fixing the magnetic circuit and the damper. Vibration actuator.