JP2015046727A - Improvement method of vibration characteristics in multifunctional vibration actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multifunctional vibration actuator in which the bonding strength and damper function of a suspension can be enhanced, without enlarging the space for damper in the housing.SOLUTION: In a square dynamic structure using a frame-like suspension, overall thickness can be suppressed while enhancing the damper function, by bonding both components of the frame-like suspension and a magnetic circuit while holding a cushioning material, having a planar shape wider than that of a bonding portion, between the bonding portions of the frame-like suspension and magnetic circuit.

Description

  According to the present invention, an acoustic reproduction unit constituted by a diaphragm provided with a voice coil is fixed to an end surface of a housing, and a magnetic circuit unit having a magnet is supported on an inner wall of the housing via a frame-like suspension, thereby The present invention relates to a multi-function vibration actuator having a dynamic structure in which a magnetic circuit portion is disposed oppositely.

  Currently, mobile communication devices typified by multi-function mobile phones are equipped with an incoming call notification function for notifying the user of incoming calls through sound reproduction and body vibration. As typical examples of devices that provide such an incoming call notification function, there are many examples described in JP-T-2003-515435 (hereinafter described as Patent Document 1) and JP-A-2005-269696 (hereinafter described as Patent Document 2). A functional vibration actuator has been filed and published. In both Patent Documents 1 and 2, an acoustic reproduction unit having a diaphragm with a voice coil attached thereto and a magnetic circuit unit having a magnet are arranged opposite to each other, and the acoustic reproduction unit and the magnetic circuit unit are selectively selected according to the input frequency to the voice coil. A dynamic structure that drives the motor is used. In addition, the structure described in Patent Document 1 is characterized in that an elastic body is sandwiched between the suspension and the magnetic circuit unit to suppress steepness in mechanical resonance. Further, Patent Document 2 provides a damper function at the time of experiencing vibration and receiving an impact such as a drop by providing an elastically deformable annular member between the suspension and the cover. .

Special table 2003-515435 Japanese Patent Laying-Open No. 2005-269496

  While having the above-described technical features and the effects thereof, the multi-function vibration actuators described in Patent Documents 1 and 2 are structurally space in the housing having a cylindrical shape that wraps the side surface of the magnetic circuit unit Therefore, the effect of the damper function is limited. This is because the multifunctional vibration actuators described in Patent Documents 1 and 2 have the suspension fixed and the damper function improved by making the elastic member a block shape.

  That is, the multi-function vibration actuators described in Patent Documents 1 and 2 have a technical feature of a structure in which only the bottom surface on the inner peripheral side of the suspension is fixed by an elastic body, or a structure in which the suspension is fixed by an elastic body. . For this reason, it is difficult to improve both the damper function and the fixing strength of the suspension without increasing the mounting space of the multi-function vibration actuator in the housing.

  In order to solve the above problems, the invention described in the present application can improve the fixing strength and the damper function of the suspension without enlarging the space for the damper inside the housing having a cylindrical shape that wraps the side surface of the magnetic circuit section. The purpose is to provide a multifunctional vibration actuator.

  For the above-mentioned purpose, in the first aspect of the present invention, a multi-function vibration actuator having a dynamic structure supports a magnetic circuit unit using a frame-shaped suspension, and between the frame-shaped suspension and the magnetic circuit unit. The technical feature is a structure in which a buffer material having a planar shape wider than that of the fixed portion is sandwiched between the fixed portion and the fixed portion.

Further, the second aspect of the present invention is characterized in that an adhesive is used as the buffer material described in the first aspect.

  By using the structure described above, the multi-function vibration actuator according to the first aspect of the present invention can provide the effect of increasing the fixing strength of the suspension and improving the damper function without limiting the space inside the housing. it can. This is the effect of increasing the area of the plate-like elastic member in comparison with the suspension fixing portion in the structure described in the present application.

  More specifically, by expanding the area, not only the suspension side facing surface but also the suspension side surface adjacent to the facing surface can be fixed to the elastic member between the suspension frame-like suspension and the magnetic circuit section. It becomes. For this reason, a stronger fixing strength can be provided by the suspension having an increased number of fixing points and the magnetic circuit unit having an increased fixing area. Furthermore, by making the cushioning material into a plate shape, the size expansion in the thickness direction between the frame-shaped suspension and the magnetic circuit part is suppressed, and the damper function is enhanced on the magnetic circuit part side by enlarging the area of the cushioning material. An effect can also be obtained. Further, the multifunction vibration actuator according to the present invention uses a structure using a frame-like suspension. For this reason, the volume of the magnetic circuit part accommodated in a housing can be ensured to the maximum.

  In addition to the above effects, it is possible to improve non-linearity in characteristics of the frame suspension by providing the cushioning material. More specifically, the tensile force, the compressive force, and the torsional force generated when the frame-like suspension is displaced can be released, and the relationship between the displacement and the load on the vibration characteristics can be made a linear relationship. For this reason, it is possible to alleviate the asymmetry of the vibration frequency characteristic caused by the nonlinearity of the frame suspension, and to improve the reproducibility of the response to the frequency of the input signal when the body vibration is generated.

  Furthermore, by improving the non-linearity in the characteristics, it is possible to suppress the fluctuation of the resonance frequency that occurs when using the frame suspension. More specifically, for vibration characteristics that show different resonance frequencies for each input level, which are generated by using a frame-like suspension, the variation in resonance frequency is suppressed through each input level, and operation is performed at a constant resonance frequency regardless of the input level. It becomes possible to make it.

  In addition, by using the content described in the second aspect of the present invention for the above structure, the above-described effects can be obtained without increasing the number of parts. In addition, in this aspect, the adhesive functions as a buffer material. For this reason, with respect to the fixation between the frame-like suspension and the magnetic circuit portion, it is possible to provide the fixation at the portion where the interval is narrow and the addition of the damper function at the portion where the interval is wide in a single step.

As described above, by using the structure described in the claims of the present application, it is possible to provide a multi-function vibration actuator capable of improving suspension fixing strength and damper function without expanding the damper space inside the housing. can do.

Overall perspective view of multifunctional vibration actuator used in an embodiment of the present invention Exploded perspective view of a multi-function vibration actuator used in an embodiment of the present invention The drive part perspective view of the multi-function type vibration actuator used in the embodiment of the present invention 1 is a side sectional view taken along line AA ′ and B-B ′ in the overall perspective view of FIG. 1.

  Hereinafter, the best embodiment of the present invention will be described with reference to FIGS. 1, 2, 3 and 4. In addition, about the symbol and component number in a figure, the common symbol or number is provided to what functions as the same component.

  1 is an overall perspective view of a multi-function vibration actuator used in the best embodiment of the present invention, FIG. 2 is an exploded perspective view, and FIG. 3 is a perspective view of a drive unit of the multi-function vibration actuator according to this embodiment. FIG. 4 is a side sectional view taken along lines AA ′ and BB ′ in FIG.

  As can be seen from FIG. 1, the multi-function vibration actuator used in this embodiment is provided with a rectangular diaphragm 3 in a rectangular housing 5, and a center cap 2 is fixed to the center of the diaphragm, and a grille 1 surrounds the outer periphery of the diaphragm. Protect. For this reason, the space efficiency can be improved by the square planar shape when assembled into the mounting housing. In addition, by providing the center cap 2 at the center of the diaphragm 3, it is possible to improve the non-linearity of the diaphragm and provide an acoustic output with reduced distortion while having a square planar shape.

  As can be seen from FIGS. 2 and 4, the multi-function vibration actuator used in this embodiment has a center cap 2, a diaphragm 3, and a voice coil 4, and a sound reproducing portion by a magnetic pole piece 7 and a yoke 10. The magnet circuit 8 is sandwiched, and a weight 9 is provided on the outer periphery of the yoke 10 to constitute magnetic circuit sections. In this embodiment, the sound reproducing unit and the magnetic circuit unit are fixed to the end surface of the housing 5, and the magnetic circuit unit is fixed to the frame-like suspension 6 through the buffer material 11. The inner wall of the housing 5 has a cylindrical shape that wraps around the side surface of the magnetic circuit portion. For this reason, the drive structure of the multi-function vibration actuator used in this embodiment forms a square dynamic structure in which the voice coil 6 is arranged in the magnetic gap g formed between the pole piece and the yoke, and follows with high magnetic efficiency. This makes it possible to perform sound reproduction and sensation vibration with good performance.

  In addition to the basic structure described above and the effects thereof, as is understood from FIGS. 2 and 3, in this embodiment, the magnetic circuit portion is fixed to the frame-like suspension 6 via the buffer material 11. As can be seen from FIG. 3, the cushioning material 11 has a planar shape wider than the fixed portion between the suspension and the yoke. More specifically, in the present embodiment, as a technical feature, the planar shape of the buffer material 11 is formed wider than the fixing portion, and the buffer material 11 is fixed to the buffer material 11 by the adhesive c including the side surface of the fixing portion. It has a structure. For this reason, when strain is transmitted from the fixing portion to the buffer material 11, a sufficient fixing strength is maintained, and the magnetic circuit side fixing portion of the frame-shaped suspension 6 is elastically supported with respect to the yoke 10 to thereby support the frame-shaped suspension. It is possible to make the relationship between the displacement and the load a linear relationship by releasing the strain received by the corner portion 6 to the buffer material 11 through the fixing portion and improving the nonlinearity of the frame suspension in the vibration characteristics. did it. In addition, as shown in the BB ′ cross-sectional view of FIG. 4, in this embodiment, a part of the frame-like suspension fixing portion p insert-molded on the inner wall of the housing is used as a shock-resistant stopper, Sometimes it is possible to prevent contact between the voice coil 4 and the magnetic circuit section.

  In addition, asymmetry of the vibration frequency characteristics caused by the non-linearity of the frame suspension is alleviated as an effect of the change in the above characteristics, and the reproducibility of the response to the frequency of the input signal when experiencing vibration is improved. Became possible. More specifically, by improving non-linearity in the above characteristics, fluctuations in the resonance frequency that occur when using the frame suspension can be suppressed, and operation can be performed at a constant resonance frequency regardless of the input level.

  Further, from the same technical point of view as this embodiment, it is possible to use a flexible adhesive as the cushioning material 11, and in addition to the above-described effects, the effect of reducing the number of parts can be imparted. it can.

As described above, by using the structure described in the embodiment of the present application, a multi-function vibration actuator capable of improving the suspension fixing strength and the damper function without expanding the damper space inside the housing is provided. We were able to.

DESCRIPTION OF SYMBOLS 1 Grill 2 Center cap 3 Diaphragm 4 Voice coil 5 Housing 6 Frame suspension 7 Pole piece 8 Magnet 9 Weight 10 Yoke 11 Elastic member 12 Cover 13 Contact terminal

c Adhesive g Magnetic gap p Suspension housing side fixing part

Claims (2)

The diaphragm provided with the voice coil is fixed to the end surface of the cylindrical housing,
A multi-function vibration actuator having a dynamic structure that supports a magnetic circuit portion having a magnet on the inner wall of the housing using a frame-shaped suspension,
A multi-function vibration actuator fixed between a fixed portion between the frame-shaped suspension and the magnetic circuit portion with a buffer material having a planar shape wider than the fixed portion interposed therebetween.   The multifunction vibration actuator according to claim 1, wherein the buffer material is an adhesive.

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