JP2021191013A - Vibration actuator - Google Patents

Abstract

To provide a thin vibration actuator which has a large vibrational thrust, and can give large vibration within a limited space.SOLUTION: A vibration actuator 100 includes a casing, a movable element holding part, a movable element held by the movable element holding part, a shaft 20 that passes through the movable element holding part so as to be slidably held by the movable element holding part and fixed to the casing, and a fixed element that is disposed to be opposed to the movable element and is fixed to the casing. Compression springs 22 are provided on both ends of the shaft inside the casing, and further, bushes 24 that are slidable with respect to the shaft are provided inside the compression springs. The bushes are fixed to the movable element holding part, and the movable element holding part and the movable element vibrate in the axial direction of the shaft.SELECTED DRAWING: Figure 3

Description

The present invention relates to a thin vibration actuator.

In recent years, sports competitions using computer games and video games called e-sports have been performed, and a highly operable keyboard called a gaming keyboard is used as an input means thereof. Since the gaming keyboard requires quick and accurate operation, it is devised to give a feeling of corrosion according to the input operation.

Further, in recent years, there is a demand for a mechanism that allows a person to experience a larger vibration depending on the situation of competition such as fighting and explosion. Examples of the vibration generation source for the input device include the vibration actuator described in Patent Document 1 for transmitting the operation sensation of the touch panel to the hand. The vibration actuator described in Patent Document 1 is a thin vibration actuator, but there is a demand for a vibration actuator capable of giving a larger vibration in a limited space.

Japanese Unexamined Patent Publication No. 2011-97747

An object of the present invention is to provide a thin vibration actuator having a large thrust, which can give a larger vibration in a limited space.

The vibration actuator of the present invention is slidably penetrated and held in the housing, the mover holding portion, the mover held by the mover holding portion, and the mover holding portion, and is held in the housing. It has a shaft to be fixed and a stator arranged facing the movable element and fixed to the housing, and compression springs are wound around both ends inside the housing of the shaft, and further inside the shaft. It has a bush that is slidable with respect to the shaft, the bush is fixed to the mover holder, and the mover and the stator form a magnetic circuit, whereby the mover holder and the mover are formed. Is characterized in that it vibrates in the axial direction of the shaft.

The housing is a flat square cylinder and includes a top surface yoke, a bottom surface yoke, and a pair of side surface yokes, the shaft is fixed at both ends to the pair of side surface yokes, and the stator is fixed to the bottom surface yoke. Will be done.

The mover is a flat coil, and the stator is a flat plate-shaped permanent magnet.

The mover is a flat plate-shaped permanent magnet, and the stator is a flat coil.

According to the present invention, it is possible to provide a vibration actuator that is thin and can give a large vibration required for a gaming keyboard.

It is a top perspective view of the vibration actuator 100 of this invention. It is a top perspective view of the vibration actuator 100 of this invention. It is a top perspective view of the vibration actuator 100 of this invention. It is a top view of the vibration actuator 100 of this invention. It is a top view of the vibration actuator 100 of this invention. It is a top view of the vibration actuator 100 of this invention. It is XY direction side view of the vibration actuator 100 of this invention. It is XY direction side view of the vibration actuator 100 of this invention. It is a YZ direction side view of the vibration actuator 100 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 is a top perspective view of the vibration actuator 100 of the present invention, FIG. 2 is a view in which the top yoke 11 is removed from FIG. 1, and FIG. 3 is a view in which the mover holding portion 14 is removed from FIG. 4 is a top view of the vibration actuator 100 of the present invention, FIG. 5 is a view in which the top yoke 11 is removed from FIG. 4, and FIG. 6 is a view in which the mover holding portion 14 is removed from FIG. Further, FIG. 7 is a side view in the XY direction of the vibration actuator 100 of the present invention, FIG. 8 is a view in which the side yoke 2 and the mover holding portion 14 are removed from FIG. 7, and FIG. 9 is a side view in the YZ direction of the vibration actuator 100 of the present invention. In the figure, the upper surface yoke 11 and the actuator holding portion 14 are removed. The size of the vibration actuator 100 (the size of the XZ surface) is, for example, about the size of a postcard, which is considerably larger than the vibration actuator described in Patent Document 1 used for mobile phones, touch panels, and the like.

As shown in FIGS. 1, 4, and 7, the vibration actuator 100 includes a housing 10, and the housing 10 has a top surface yoke 11, a side surface yoke 12, and a bottom surface yoke 13, and has a long flat angle in the X direction in the figure. It is tubular. As shown in the figure, the upper surface yoke 11 has dimensions in the X-axis direction shorter than those of the side surface yoke 12 and the bottom surface yoke 13, and the mover holding portions 14 are arranged at the shortened portions (both ends of the upper surface yoke 11 in the X-axis direction). The housing 10 and the mover holding portion 14 form a flat box shape.

The mover holding portion 14 has a long flat prismatic shape in the Z direction in the figure, has a through hole in the Z direction, and has a recess at one end (center side of the housing) in the X direction. The through hole is formed to allow the shaft 20 and the compression spring 22, which will be described later, to pass through and fix the bush 24. Further, the recess is formed to fix the coil 16 described later.

Further, as shown in FIGS. 2, 5 and 8, the coil 16 and the magnet 18 are housed inside the housing 10 facing each other. In the present embodiment, the movable element holding portion 14 and the coil 16 are on the movable side, and the vibration direction thereof is the Z direction in the figure. The magnet 18 is on the fixed side. The coil 16 has an elliptical or rectangular flat shape and is held by the mover holding portion 14. The magnet 18 has a flat plate shape and is fixed to the bottom yoke 13 by, for example, adhesive.

Further, as shown in FIGS. 3, 6 and 9, a shaft 20 extending in the vibration direction is held inside the mover holding portion 14. The shaft 20 penetrates the side yoke 12 and is fixed by a retaining ring 26 from the outside. Compression springs 22 are arranged at both ends of the shaft 20 (inside the side yoke 12) so as to wind around the shaft 20. Although the position of the compression spring 22 is restricted by the bush 24, neither the compression spring 22 nor the bush 24 is fixed to the shaft 20 and relative movement is allowed.

The mover holding portion 14 is made of resin, for example, and the coil 16 and the bush 24 are fixedly held inside the movable element holding portion 14, and the inner shape is formed according to their outer shapes so that the shaft 20 and the compression spring 22 can penetrate without being fixed. ing. Although the bush 24 is fixedly held by the mover holding portion 14, it is slidable with respect to the shaft 20. Since the shaft 20 is fixed to the housing 10 (side yoke 12) and not fixed to the mover holding portion 14, when a current of a predetermined frequency is passed through the coil through an electrode and wiring (not shown), the mover holding portion 14 Vibrates in the direction of the shaft 20 (Z direction), and a desired vibration can be applied to a gaming keyboard or the like in which the vibration actuator 100 is incorporated.

The mover holding portion 14 holds the coil 16 and the bush 24, and the shaft 20 and the compression spring 22 penetrate the mover holding portion 14, so that the vibration direction of the mover holding portion 14 and the coil 16 (Z direction in the figure). The dimensions of can be set almost to fill the housing 10 with the clearance required for vibration. Therefore, there is almost no wasted space in the housing 10, and the magnetic circuit can be made as large as possible with respect to the size of the housing 10, so that the vibration actuator 100 can obtain the maximum thrust in that size. Will be.

In the above embodiment, the coil is set to the movable side and the magnet is set to the fixed side, but by holding the magnet in the mover holding portion and fixing the coil to the housing, the magnet can be set to the movable side and the coil can be set to the fixed side. can.

The vibration actuator of the present invention can give a larger vibration in a limited space, and for example, it can be used industrially in that it can provide a gaming keyboard or the like that can be attached to give a more realistic feeling. Has the potential.

10 Housing 11 Top yoke 12 Side yoke 13 Bottom yoke 14 Movable holder 16 Coil 18 Magnet 20 Shaft 22 Compression spring 24 Bush 26 Retaining ring 100 Vibration actuator

Claims (4)

A housing, a movable element holding portion, a movable element held by the movable element holding portion, a shaft that penetrates the movable element holding portion and is slidably held and fixed to the housing, and the said. It has a stator that is placed face-to-face with the mover and fixed to the housing.
A compression spring is wound around both ends inside the housing of the shaft, and a bush slidable with respect to the shaft is provided inside the bush, and the bush is fixed to the mover holding portion. ,
A vibration actuator comprising the movable element and the stator forming a magnetic circuit so that the movable element holding portion and the movable element vibrate in the axial direction of the shaft. The housing is a flat square cylinder and includes a top surface yoke, a bottom surface yoke, and a pair of side surface yokes, the shaft is fixed at both ends to the pair of side surface yokes, and the stator is fixed to the bottom surface yoke. The vibration actuator according to claim 1. The vibration actuator according to claim 1 or 2, wherein the mover is a flat coil, and the stator is a flat plate-shaped permanent magnet. The vibration actuator according to claim 1 or 2, wherein the mover is a flat plate-shaped permanent magnet, and the stator is a flat coil.

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