JP2012061384A - Vibrating motor apparatus with speaker function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure without lowering both functions of a speaker and a vibrating motor.SOLUTION: This apparatus has a rotary shaft 1 supported rotatably in a case, and a weight 2 fixed eccentrically with respect to the rotary shaft in the case, and rotating together with the rotary shaft 1 to generate vibration. Further, a permanent magnet 4 having two different magnetic pole parts is fixed to the rotary shaft 1 in the case, and one magnetic pole part is arranged on a position rotated by 180° in the centered state at the rotary shaft with respect to the other magnetic pole part. A diaphragm 3 is fixed to the case, in the facing state to the permanent magnet 4. A plurality of coils 5 are positioned between the permanent magnet 4 and the diaphragm 3, and the coils are fixed on the diaphragm 3 so as to be positioned at each equal angle in the centered state at the rotary shaft 1.

Description

  The present invention relates to a vibration motor device having a speaker function.

  Mobile devices such as mobile phones are equipped with a vibration motor so that the user can be notified of the reception using vibration as well as the sound produced by the speaker. In such a mobile phone, if the vibration motor and the speaker are configured as separate parts, it is contrary to the recent trend toward miniaturization and weight reduction. Therefore, there is a need for a small part in which the functions of both the speaker and the vibration motor are contained in one package. Yes.

  For example, in the devices disclosed in Patent Documents 1 and 2, etc., an annular magnet is fixed in the case, a cylindrical magnetic body is fixed inside the magnet via a gap, and a boil coil is inserted into the gap. The voice coil is fixed to a diaphragm whose peripheral part is fixed to the periphery of the case. Further, a shaft fixed to the bottom surface of the case is positioned inside the cylindrical magnetic body, and a rotor (eccentric rotor) including a weight and a coil is rotatably supported around the shaft. When a high frequency signal is applied to the boil coil, the diaphragm vibrates and generates a sound pressure, and when a direct current is applied to the coil of the eccentric rotor, the eccentric rotor rotates about the axis to generate vibration.

Japanese Patent No. 3856429 (see FIGS. 1 to 3) Japanese Patent Laid-Open No. 2002-177883 (see FIGS. 1 and 3)

  However, the devices disclosed in Patent Documents 1 and 2 have the following problems.

  One is that a pair of coils and magnets is prepared for each of the speaker and the vibration motor, which complicates the structure and hinders space saving and weight reduction.

  Furthermore, since magnetic parts that affect each other are packed close together in a narrow space, the rotation of the motor is adversely affected.

  For example, the field magnet provided in the apparatus described in Patent Document 2 has a structure in which an annular magnet for a vibration motor having a plurality of different magnetic poles is bonded to the outer periphery of a single-pole annular magnet for a speaker. There are portions where the repulsive magnetic poles are in close contact with each other, impeding the rotational efficiency of the motor.

  In view of the above problems, an object of the present invention is to simplify the structure without deteriorating the functions of both the speaker and the vibration motor.

  The present invention relates to a vibration motor device having a speaker function. One aspect thereof includes a case, a rotating shaft that is rotatably supported in the case, and a weight that is eccentrically fixed to the rotating shaft in the case and rotates with the rotating shaft to generate vibration. In this aspect, a permanent magnet having two different magnetic pole portions is fixed to the rotating shaft in the case, and one of the magnetic pole portions is rotated 180 degrees around the rotating shaft with respect to the other magnetic pole portion. Arranged in position. A diaphragm is fixed to the case so as to face the permanent magnet. A plurality of coils are located between the permanent magnet and the diaphragm, and these are fixed on the diaphragm so as to be located at an equal angle around the rotation axis. In other words, in the present invention, a set of a permanent magnet that rotates around the rotating shaft and a plurality of coils that are fixedly arranged around the rotating shaft is configured as a magnetic component that is common to the speaker function and the vibration motor function. It is housed in the case.

  According to the present invention, since the coil and the magnet, which are the components of the speaker and the vibration motor, are configured as parts common to both, the number of components is small and the structure is simplified. Therefore, it is possible to reduce the size of components, leading to a reduction in the size of portable devices.

The schematic diagram which shows the structure concept of the vibration motor apparatus with a speaker function by this invention. The schematic diagram which looked at the apparatus of FIG. 1 from the direction along the rotating shaft. The figure which showed the current waveform of each coil in the case of implementing vibration motor mode about the apparatus of FIG. The figure which showed the current waveform of each coil in the case of implementing speaker mode about the apparatus of FIG.

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

  FIG. 1 schematically shows the configuration concept of the present invention. In the present invention, the functions of both the vibration motor and the speaker used in the portable device are housed in a single package with a simple structure without adversely affecting the functions of each other. In addition, sound generation and vibration generation can be controlled by a signal pattern that flows through electrodes of a common coil.

  Therefore, the device of the present invention built in the portable device casing includes a cup-shaped case (not shown), and a rotating shaft 1 rotatably supported by a bearing or the like as shown in FIG. A weight 2 that is eccentrically fixed to the shaft 1 is accommodated. The weight 2 rotates with the rotating shaft 1 to generate vibration. Further, an opening (not shown) of the case exists near the lower end of the rotating shaft 1, and the diaphragm 3 is fixed so as to close the opening, and sound pressure is generated by vibration of the diaphragm 3. The diaphragm 3 exists in a plane intersecting with the rotation axis 1.

  In order to generate this vibration and sound pressure, a permanent magnet 4 and a coil 5 are fixed around the rotating shaft 1 between the weight 2 and the diaphragm 3 in the case. Specifically, the permanent magnet 4 has two different magnetic pole portions 4A and 4B, the intermediate point between both magnetic pole portions is fixed to the fixed shaft 1, and one magnetic pole portion rotates with respect to the other magnetic pole portion. It is arranged at a position rotated 180 degrees around the axis 1 (180 degree rotationally symmetric position). The permanent magnet 4 rotates together with the rotary shaft 1 while maintaining the positional relationship of the magnetic pole portions. Three coils 5 are arranged at an equal angle of 120 degrees around the rotating shaft 1 and are fixed on the diaphragm 3 so as not to be related to the rotation of the rotating shaft 1. Each coil 5 includes an electrode 6 for inputting a signal current. The three coils 5 are located within the outer edge of the diaphragm 3, and each magnetic pole portion of the permanent magnet 4 has substantially the same outer diameter as the coil 5. The distance from the rotating shaft 1 to the center of each coil 5 is the same as the distance from the rotating shaft 1 to the center of each magnetic pole portion of the permanent magnet 4. In FIG. 1, the two magnetic pole portions 4A and 4B of the permanent magnet 4 are separately illustrated, but actually, the two magnetic pole portions 4A and 4B constitute one permanent magnet 4.

  In such a configuration, by applying the same direct current to the three coils 5 while shifting the time, the same magnetic field can be generated in the three coils 5 in order. By repeating this, the position of the same magnetic field can be moved in the circumferential direction around the rotating shaft 1 as time elapses. In this way, the same magnetic field sequentially generated at each coil position and each magnetic pole portion of the permanent magnet 4 repel and attract each other, whereby the rotating shaft 1 and the weight 2 connected to the permanent magnet 4 rotate and function as a vibration motor. .

  Further, the coil 5 is fixed on the diaphragm 3 so as not to rotate, and an alternating current superimposed with a sound signal is passed through any one of the coils 5 so that the magnetic field of the coil 5 is a magnetic pole portion of the permanent magnet 4. Therefore, the diaphragm 3 vibrates and functions as a speaker.

  Thus, in the present invention, since both the speaker and the vibration motor share the same magnet and coil, it is possible to simplify the structure. In addition, there is only one set of magnet and coil, and there are few elements that weaken this magnetic field in the surrounding area.

The operation of the specific vibration motor mode will be described using the waveform of FIG.

  FIG. 3 shows a current waveform that flows through three coils 5 (coil A, coil B, and coil C) arranged on the circumference around the rotation axis 1 when the vibration motor mode is implemented in the apparatus of FIG. It is a thing. As shown in this figure, the three coils 5 have a pattern in which one magnetic field (N pole in the case of FIG. 3) is generated sequentially from each coil 5 around the rotation axis 1 toward the permanent magnet 4 side. Current is passed through. Thereby, each magnetic pole part of the permanent magnet 4 follows and rotates, the weight 2 also rotates, and a vibration generate | occur | produces.

  Next, the operation in the speaker mode will be described with reference to FIGS. FIG. 2 is a schematic view of the apparatus shown in FIG. 1 as viewed from the direction along the rotation axis 1. FIG. 4 shows a current waveform that flows through three coils arranged on the circumference around the rotation axis 1 when the speaker mode is implemented in the apparatus of FIG.

  As shown in FIG. 4, an audio signal is supplied to only one coil C (coil 5C in FIG. 2), and a constant current is continuously supplied to the remaining two coils A and B (coils 5A and 5B in FIG. 2). Thus, coil A and coil B generate an N-pole magnetic field. As a result, as shown in FIG. 2, the magnetic pole portion 4A of the S pole in the permanent magnet 4 is positioned between the coil 5A and the coil 5B, so that the magnetic pole portion 4B of the N pole is positioned immediately above the coil 5C. Fixed. That is, the rotating shaft 1 is prevented from rotating and functioning as a vibration motor. Since the state in which one magnetic pole portion 4B is fixed immediately above the coil 5C is maintained, the coil 5C becomes a boil coil, and the audio signal input to the coil 5C is favorably converted into the vibration of the diaphragm 3.

  Furthermore, this apparatus can switch the vibration motor mode and the speaker mode as described above by external input. When the vibration motor mode is set, the current of the signal pattern as shown in FIG. When applied to the electrode 6 and the speaker mode is set, as shown in FIG. 4, a sound signal such as a ringing melody stored in the internal memory of the portable device is applied only to the electrode 6 of one coil 5C, and the rest The electrodes 6 of the two coils 5A and 5B are provided with a coil drive circuit (not shown) for applying a constant current.

  The configuration of the present invention has been described above with reference to the drawings. However, the present invention is not limited to the configuration illustrated in the drawings, and various modifications can be made without departing from the spirit of the present invention. For example, the number of coils 5 and electrodes 6 is not limited to three, and can be configured as long as two or more.

  Also, instead of using the diaphragm 3 that is common to all the coils 5, a diaphragm is prepared for each coil, and a different audio signal is sent to each coil, so that a multi-channel speaker is provided. It is also possible to function as.

DESCRIPTION OF SYMBOLS 1 Rotating shaft 2 Weight 3 Diaphragm 4 Permanent magnet 4A, 4B Magnetic pole part 5, 5A, 5B, 5C Coil 6 Electrode

Claims (3)

A vibration motor device having a speaker function,
Case and
A rotating shaft rotatably supported in the case;
A weight that is eccentrically fixed to the rotating shaft in the case and rotates together with the rotating shaft to generate vibration;
A permanent magnet having two different magnetic pole portions fixed to the rotating shaft in the case, wherein one magnetic pole portion is arranged at a position rotated 180 degrees around the rotating shaft with respect to the other magnetic pole portion. The permanent magnet being
A diaphragm fixed to the case so as to face the permanent magnet;
Between the permanent magnet and the diaphragm, a plurality of coils fixed on the diaphragm so as to be positioned at an equal angle around the rotation axis;
Vibration motor device having The vibration motor device according to claim 1,
A vibration motor mode that repeatedly generates the same magnetic field in order by applying the same direct current to the plurality of coils while shifting the time, and to any one of the plurality of coils A vibration motor device further comprising a coil drive circuit that selectively performs a speaker mode that applies a sound signal and applies a constant current to the remaining coils. In the vibration motor device according to claim 1 or 2,
The vibration motor device, wherein the diaphragm is prepared for each of the plurality of coils.

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