JP2006006990A - Vibration motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration motor capable of smoothly starting to be rotated even in the low electro-motive force and obtaining larger vibration by variation of a voltage. <P>SOLUTION: The vibration motor is constituted by a motor 1 and a weight 3 fixed to a rotation shaft 2 of the motor 1. A fluid mattery 5 is stored in an expandable/contractable bag-like storage part 4 and the bag-like storage part 4 for storing the fluid matter 5 is mounted to the rotation shaft 2 of the motor 1 as the weight 3. The fluid matter 5 is, for example, liquid-like, gel-like or powdery substance. The bag-like storage part 4 is formed, for example, by a rubber-like substance. In the bag-like storage part 4 for storing the fluid mattery 5, the center of gravity is outwardly moved by centrifugal force accompanying rotation of the rotation shaft 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vibration motor that generates vibration for notifying an incoming call, for example, in a mobile phone or the like, and more particularly to improvement of a weight thereof.

  In a mobile phone or the like, when a ring tone is restricted, such as a so-called manner mode, notification of an incoming call by vibration is widely adopted. By causing the mobile phone to vibrate, it is possible to notify the user of an incoming call without disturbing the surroundings.

  In this case, a vibration motor in which a weight is attached to a rotating shaft is incorporated as a vibration generation source in a mobile phone. In general, the weight attached to the rotating shaft is such as tungsten alloy or iron. For example, a semi-cylindrical weight is used (see, for example, Patent Document 1).

  FIG. 5 shows a typical configuration of a conventional vibration motor, and a metal weight 103 is fixed to a rotating shaft 102 of the motor 101. In order to generate vibration, the weight 103 needs to be eccentrically attached to the rotating shaft 102. Here, a plurality of fan-shaped weights 103 are attached and fixed by means such as welding.

Further, in Patent Document 1, an insertion hole for inserting the motor shaft is provided in the weight, the motor shaft is inserted into the insertion hole and penetrated to the outer end portion of the insertion hole, and the outer end of the motor shaft is inserted. A weight fixing method is disclosed in which a portion is fixed to a distal end portion of an insertion hole by welding means.
JP-A-11-114495

  By the way, in the vibration motor of the type in which a metal weight is fixed as in the prior art described above, in order to obtain a larger vibration, a heavy and large weight (weight) corresponding to the vibration must be used. However, when the weight is heavy, particularly at the time of start-up or the like, an electromotive force necessary for rotating the motor shaft becomes large, resulting in an increase in power consumption. In mobile phones and the like, each company is struggling to increase the available call time and standby time, and the increase in power consumption is not preferable.

  Further, in a vibration motor of a type that fixes a metal weight, the amplitude of vibration provided by the motor is constant regardless of whether the rotation is weak or strong. Now that various vibration forms are required, it is indispensable to deal with more flexible vibration variations. In this respect, conventional vibration motors remain unsatisfactory.

  The present invention has been proposed in order to eliminate the drawbacks of the conventional vibration motor, and can start to rotate smoothly even when the electromotive force is low, and a larger vibration is obtained by changing the voltage. It is an object of the present invention to provide a vibration motor that can be used. It is another object of the present invention to provide a vibration motor that consumes less power, has a variable amplitude, and can handle more flexible vibration variations than conventional ones.

In order to achieve the above-described object, a vibration motor according to the present invention is a vibration motor including a motor and a weight fixed to a rotation shaft of the motor, and a fluid is contained in a telescopic bag-shaped housing portion. And a bag-like accommodation portion containing the fluid is attached as a weight to the rotating shaft of the motor.

  In the vibration motor of the present invention, the bag-like container that contains the fluid (a substance such as liquid, gel, or powder) that functions as a weight is not applied to the motor, that is, before the motor is started. The centrifugal force is not applied, and is pulled inward (near the rotating shaft) by the expansion and contraction force of the bag-like housing portion. When an electromotive force is applied to the motor in this state, the motor starts to rotate smoothly even when the electromotive force is low.

  On the other hand, as the voltage applied to the motor is increased, the fluid accommodated in the bag-like accommodation part obtains a centrifugal force, and the bag-like accommodation part expands accordingly, and the center of gravity of the weight moves outward. As a result, the same effect as when the weight is heavy is obtained, and a larger vibration is obtained. Moreover, the amplitude of the vibration obtained is variable depending on the strength of the voltage applied to the motor.

  According to the present invention, it is possible to provide a vibration motor that can start to rotate smoothly even in a state where the electromotive force is low and can obtain a larger vibration by a change in voltage. In addition, it is possible to provide a vibration motor that consumes less power, has a variable amplitude, and can handle more flexible vibration variations than conventional ones.

  Hereinafter, a vibration motor to which the present invention is applied will be described in detail with reference to the drawings.

  As shown in FIG. 1, the vibration motor of this embodiment is formed by attaching a weight 3 to the rotating shaft 2 of the motor 1. In this respect, the vibration motor is basically the same as the conventional vibration motor. However, in the present invention, it is a great feature that the weight 3 is not a weight made of a hard material such as metal, but a weight that can be expanded and contracted. Hereinafter, the weight 3 will be described.

  In the vibration motor according to the present embodiment, as described above, the weight 3 is a retractable weight. Specifically, as shown in FIG. 2, the weight 3 is composed of a bag-like accommodation portion 4 that can expand and contract like a rubber balloon. However, since only the bag-like storage part 4 is insufficient in weight and cannot sufficiently function as a weight, the liquid or gel fluid 5 instead of the metal weight is used as the bag-like storage part. 4 is accommodated.

  The bag-like storage part 4 is made of a stretchable material such as various rubbers, has a bag-like form, and stores the fluid 5 therein. Therefore, it is necessary to be made of a material that is not affected by the fluid 5, and it is necessary to select a material suitable for this depending on the type of the fluid 5 in the liquid or gel state. In addition, since the substance contained in the liquid is in a liquid, gel, or powder form, it is necessary to pay attention to pinholes.

  The bag-shaped housing portion 4 needs to be attached to the rotating shaft 2 of the motor 1, and an attaching portion 6 provided with a hole 6a into which the rotating shaft 2 is inserted is formed. By simply inserting the rotary shaft 2 through the attachment portion 6, the attachment of the bag-like storage portion 4 to the rotary shaft 2 can be completed, and complicated attachment work such as welding is unnecessary. Further, since the attachment portion 6 is formed integrally with the bag-like storage portion 4 and is formed of a material such as rubber, the attachment portion 6 is not inadvertently dropped from the rotating shaft 2 due to the frictional force thereof.

  In addition, it is preferable to provide a plurality of the attaching portions 6 in the axial direction of the rotating shaft 2, for example, two or more places as shown in FIG. Thereby, the attachment state of the weight 3 to the rotating shaft 2 becomes stable.

  On the other hand, the fluid 5 accommodated in the bag-like accommodating portion 4 may be any fluid as long as it has fluidity, and liquid, gel-like, and powder-like substances can be used. is there. However, since the fluid 5 replaces the weight, it is preferable that the fluid 5 is a substance having a certain specific gravity. It is also preferable to avoid substances whose fluidity is lost or lowered due to temperature conditions or the like.

  In the vibration motor having the above-described configuration, before applying a voltage to the motor 1, the fluid 5 serving as a weight substitute is on the inside, and the bag-like storage portion 4 is in a contracted state. Therefore, it starts to rotate smoothly even when the electromotive force is low as compared with the case where a metal weight is used.

  At this time, the intensity of vibration is felt to be small, but as the voltage applied to the motor 1 is increased, as shown in FIG. Accompanied by this, the bag-like accommodation portion 4 extends, and the center of gravity of the weight 3 moves outward. As a result, when the voltage applied to the motor 1 is increased and the rotation of the rotary shaft 2 is accelerated, the apparent weight of the weight 3 is increased and a larger vibration can be obtained.

  As described above, in the vibration motor according to the present embodiment, due to a change in the voltage applied to the motor 1, a weak vibration (amplitude) can be obtained when the voltage is weak, and a strong vibration (amplitude) can be obtained when the voltage is strong. it can. For this reason, it becomes possible to make the amplitude variable, and it is possible to flexibly cope with various vibration variations as compared with the conventional vibration motor. In addition, since the electromotive force at the time of activation is low, it is possible to reduce power consumption. In mobile phones and the like, reduction of power consumption is a great merit.

It is a perspective view which shows schematic structure of the vibration motor to which this invention is applied. It is a cross-sectional view of a bag-shaped accommodation part. It is a side view which shows the attachment state to the rotating shaft of a bag-shaped accommodating part. It is a perspective view which shows a mode that the gravity center of a weight moves outside with a centrifugal force. It is a perspective view which shows an example of the conventional vibration motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor 2 Rotating shaft 3 Weight 4 Bag-shaped accommodation part 5 Fluid 6 Attachment part

Claims (6)

A vibration motor composed of a motor and a weight fixed to the rotation shaft of the motor,
A vibration motor characterized in that a fluid is accommodated in an extendable bag-like accommodation portion, and the bag-like accommodation portion containing the fluid is attached as a weight to a rotating shaft of the motor.   The vibration motor according to claim 1, wherein the fluid is a liquid, gel, or powder substance.   The vibration motor according to claim 1, wherein the bag-shaped housing portion is formed of a rubber-like substance.   The vibration motor according to claim 3, wherein the bag-shaped housing portion has an attachment portion into which a rotation shaft of the motor is inserted.   5. The vibration motor according to claim 4, wherein the bag-like storage portion has a plurality of the attachment portions in an axial direction of the motor. The vibration motor according to any one of claims 1 to 4, wherein the bag-like accommodation portion that accommodates the fluid moves the center of gravity outward by centrifugal force as the rotation shaft rotates.

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