WO2006064750A1

WO2006064750A1 - Vibrating linear actuator

Info

Publication number: WO2006064750A1
Application number: PCT/JP2005/022749
Authority: WO
Inventors: Tomoyuki Kugou; Tomohide Aoyagi
Original assignee: Namiki Seimitsu Houseki Kabushikikaisha
Priority date: 2004-12-14
Filing date: 2005-12-12
Publication date: 2006-06-22
Also published as: JP2006167523A

Abstract

[PROBLEMS] To provide a vibrating linear actuator capable of providing a vibration sufficient for providing its feeling to a body while maximally securing the size of a magnet by solving a problem in a conventional vibrating linear actuator providing the vibration by disposing a coil in a magnetic gap having a magnet wherein the thickness of the mounted magnet is reduced according to a reduction in the thickness of the actuator. [MEANS FOR SOLVING PROBLEMS] The magnet is installed through a frame without forming a magnetic gap in the clearance thereof from a yoke. Thus, the overall actuator can be thinned without increasing the size of the magnet.

Description

Specification

Vibration linear actuator

Technical field

TECHNICAL FIELD [0001] The present invention relates to a vibration linear actuator used in a mobile phone and! /, A mobile communication device.

Background art

[0002] Currently, mobile communication devices typified by mobile phones are provided with a silence notification function for notifying an incoming call by a sensory vibration in addition to a function for notifying an incoming call by sound. In order to provide this function, the mobile phone is equipped with a vibration actuator. A typical example is a vibration motor that vibrates by attaching an eccentric weight to the rotation shaft of the motor.

However, since the vibration motor obtains vibration from rotational motion, there is a problem that torque during vibration is limited as compared with vibration due to reciprocation. To solve this problem, there is a vibrating linear actuator that includes a magnet and a coil and reciprocally moves a magnet supported by a suspension on a straight line using the magnetic force generated by the coil. Has been.

Further, since the vibration linear actuator vibrates in the thickness direction, there is an advantage that the user can easily detect when an incoming call is notified by vibration.

[0004] Patent Document 1: JP-A-9 205763

Patent Document 2: JP 2003-9493

Disclosure of the invention

Problems to be solved by the invention

[0005] However, in recent years, with the reduction in the thickness of mobile phones, the vibration actuators to be mounted are also required to be thin.

In response to the above-mentioned demand for thinning, the vibration linear actuator has a structure that when the thickness is thinned, the thickness of the magnet provided therein becomes thin, and the torque during vibration decreases due to the weakening of the magnetic flux. I had a problem.

Therefore, the present invention maintains the torque during vibration without changing the thickness of the magnet even if the thickness is reduced. It is an object of the present invention to provide a vibration linear actuator that can be used. Means for solving the problem

[0007] In order to solve the above-mentioned problem, in the invention according to claim 1, a magnet is provided through the frame, the frame is supported in a housing via a suspension attached to the surface of the frame, and the magnet is further provided. It is characterized by a structure in which the tip is placed close to the inner wall of the coil.

[0008] The invention according to claim 2 is the vibration linear actuator according to claim 1, wherein the frame is made of a high specific gravity material.

[0009] In the invention according to claim 3, in the vibration linear actuator according to claim 1 or 2,

In addition, the amount of air movement during driving is limited by adjusting the gap between the outer periphery of the frame and the inner side wall of the housing.

[0010] In the invention of claim 4, one coil is arranged on the inner wall of the casing, and a magnetic circuit is constituted by the coil and a magnet arranged in the magnetic flux of the coil, and the movable body provided with the magnet is provided. In a vibration linear actuator that has a structure in which a child is attached to the inside of a casing via a suspension and generates a mutual magnetic driving force between the coil and the magnet by passing a driving current through the coil.

A configuration in which a magnet is provided through the frame constituting the mover, the frame is supported in the housing via a suspension attached to the surface of the frame, and the tip end of the magnet is disposed close to the inner wall of the coil. The yoke is provided with a relief portion corresponding to deformation of the suspension during driving.

The invention's effect

[0011] According to the invention of claim 1, by providing a magnet through the frame and further disposing the tip of the magnet on the inner wall of the coil, the mover is vibrated by the attractive force or repulsive force of the magnet and the coil. Therefore, by reducing the number of magnetic circuit components such as the top plate and realizing vibration drive, and by providing a magnet that penetrates the frame further, The thickness of the vibrating linear actuator can be kept within the amplitude of the mover equipped with a magnet.

Therefore, it is possible to easily reduce the thickness of the vibration linear actuator without changing the thickness of the magnet, and to compensate for the decrease in vibration torque caused by not arranging a coil in the magnetic gap as in Patent Documents 1 and 2. I can do it.

[0012] Further, unlike the vibration linear actuator shown in Patent Documents 1 and 2, the movable element is not supported by the inner wall of the casing through the suspension, but through the suspension provided on the surface of the frame. By using the structure in which the movable element is supported by the plate 5 provided at the bottom of the body, the entire vibration linear actuator without expanding the radial dimension of the vibration linear actuator can be made compact.

[0013] In the invention of claim 2, since the magnetic circuit is composed of only the magnet and the coil as described above, the material of the frame is not limited to the magnetic material. Therefore, by using a high specific gravity material for the frame, it is possible to use the frame as a weight and increase the torque during vibration.

[0014] According to the invention of claim 3, by restricting the gap between the inner wall of the casing and the frame, the air separated into the upper and lower casing spaces is separated from the frame integrated with the magnet. Therefore, it is possible to flatten the frequency characteristics of the mover amplitude during driving without increasing the number of special parts.

According to this method, it is possible to easily obtain a stable mover amplitude frequency characteristic with a minimum number of parts.

[0015] According to the invention of claim 4, by providing the yoke with a relief portion corresponding to the deformation amount of the suspension, it is possible to maintain the amplitude of the yoke even when the thickness is reduced.

As described above, according to the present invention, it is possible to obtain a vibration linear actuator having a small diameter and a stable frequency characteristic while maintaining the vibration torque.

Further, since the number of parts is smaller than that of a vibration linear actuator having a structure in which a coil is arranged in a conventional magnetic gap, it is possible to reduce the number of assembling steps and to reduce the cost. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a vibration linear actuator according to an embodiment of the present invention will be described with reference to the drawings.

Example 1

FIG. 1 shows a side sectional view of a first embodiment used in the present invention.

As can be seen from the side cross-sectional view shown in FIG. 1, the vibration linear actuator in this embodiment is composed of a mover comprising a frame 2, a magnet 3 provided through the frame 2, and a frame surface. It consists of a suspension 6 that supports the movable element on the outer periphery, a coil 1 that drives the movable element, a cover 4 that accommodates the movable element, and a casing made up of a plate 5. With this structure, the size of the magnet 3 can be maintained in the thickness direction without mounting the top plate and yoke shown in Patent Documents 1 and 2 and other magnetic circuit components. The entire vibration linear actuator can be made thinner.

In the present embodiment, the coil 1 generates a magnetic field by passing a driving current in the vicinity of the resonance frequency of the mover through the coil 1 and works between the magnetic field generated by the coil 1 and the magnetic field generated by the magnet 3. The structure is such that the mover supported by the suspension 6 is vibrated up and down by an attractive or repulsive force.

[0020] Therefore, the magnetic circuit is composed only of the magnet 3 and the coil 1, and there is no need for a part for forming a magnetic path such as a top plate used in Patent Documents 1 and 2, and a conventional vibration reactor is used. The number of parts can be reduced compared to.

In addition, as in Patent Documents 1 and 2, the structure in which the suspension 6 attached to the surface of the frame 2 is supported by the plate 5 rather than the structure in which the mover is supported via the suspension attached to the inner wall of the casing is adopted. In this way, the radial dimension of the entire vibration linear actuator is suppressed to obtain the volume of the frame 2 that functions as a weight when the frame vibrates, and the suspension 6 is joined to the frame 2 and the plate 5 compared to Patent Documents 1 and 2. The structure can take a large area.

[0022] Further, the vibration linear actuator shown in the present embodiment has a top plate like the vibration linear actuator described in Patent Documents 1 and 2, which has fewer parts than the conventional vibration linear actuator. And the yoke is arranged in the thickness direction of the magnet, Since the dimensions of the casing in the thickness direction are determined by the amplitude of the movable element and the movable element, it can be made thinner than conventional vibration linear actuators in which a magnetic gap is formed by the yoke and the top plate. it can.

[0023] In this embodiment, the gap between the inner wall of the cover 4 and the side surface of the frame 2 is set between 0.05 mm and 0.15 mm, which restricts the movement of air above and below the frame 2 The air in the space is used as a damper to obtain a flat mover amplitude-frequency characteristic.

The same technical effect as in the present embodiment. The same effect can be obtained by using an elastic body other than the plate panel for the suspension 6 or forming the coil 1 on the inner side of the plate 2 with a printed board.

Example 2

FIG. 2 shows a side sectional view of a second embodiment used in the present invention.

As can be seen from the side cross-sectional view shown in FIG. 2, the vibration linear actuator in this embodiment includes a mover comprising a magnet 3 and a frame 2, a suspension 6 for supporting the mover, and the mover. It consists of a coil 1 to be driven, a cover 4 for housing them, a plate 5, and a housing made of a substrate 7.

[0026] The drive structure of this embodiment is the same as that of the first embodiment, and the frame 2 supported by the suspension 6 by the attractive force or repulsive force acting between the coil 1 and the magnet 3 when a drive current is passed through the coil 1. The mover consisting of the magnet 3 is structured to vibrate in the vertical direction.

[0027] In addition, as in Example 1, a flat mover amplitude frequency characteristic is obtained by setting the gap between the inner wall of the cover 4 and the side surface of the frame 2 to 0.05 mm to 0.15 mm.

[0028] Unlike the first example, this embodiment has a structure in which a mover made up of a frame 2 and a magnet 3 is supported via a suspension 6 attached to the inner periphery of the surface of the frame 2.

[0029] According to the above embodiment, a vibration linear actuator having a smaller diameter, thinner and flat frequency characteristics than the conventional one can be obtained while maintaining the size of the magnet and maintaining the torque during vibration. Come out. Brief Description of Drawings FIG. 1 is a side sectional view of a first embodiment of the present invention. FIG. 2 is a side sectional view of a second embodiment of the present invention.

[0031] 1 coil

2 frames

3 Magnet

4 Cover

5 plates

6 Suspension

Claims

The scope of the claims

[1] One coil is arranged on the inner wall of the housing, and a magnetic circuit is configured by the coil and a magnet arranged in the magnetic flux of the coil. A movable element having the magnet is suspended in the housing. In a vibration linear actuator that generates a mutual magnetic driving force between a coil and a magnet by passing a driving current through the coil, the magnet penetrates through a frame constituting the mover. The vibration linear actuator is characterized in that the frame is supported in the housing via a suspension attached to the surface of the frame, and the magnet end is disposed close to the inner wall of the coil.

2. The vibration linear actuator according to claim 1, wherein the frame is made of a high specific gravity material having a specific gravity heavier than that of iron.

[3] The clearance between the inner side wall and the frame is 0.05mn! By limiting to 0.15 mm, the amount of air movement between the upper and lower spaces sandwiching the mover inside the housing is limited, and the air in the space is used as a damper during driving. The vibration linear actuator according to claim 1 or 2.

[4] One coil is arranged on the inner wall of the casing, and a magnetic circuit is configured by the coil and a magnet arranged in the magnetic flux of the coil. A movable element having the magnet is suspended in the casing. In a vibration linear actuator that generates a mutual magnetic driving force between a coil and a magnet by passing a driving current through the coil, the magnet penetrates through a frame constituting the mover. The suspension is attached to the surface of the frame, the frame is supported in the casing, and the end of the magnet is disposed close to the inner wall of the coil. An oscillating linear actuator, wherein a relief portion corresponding to the deformation of the yoke is provided in the yoke.