JP2014046310A - Stopper structure with falling guide of multifunctional vibration actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a square-shaped multifunctional vibration actuator, capable of stabilizing a vibration characteristic and imparting impact resistance, and easy in improving space efficiency to a square-shaped mounting space.SOLUTION: The stabilization of the vibration characteristic and the improvement in the impact resistance such as falling, when sensible vibration is generated, are made possible by minimally setting a void between a housing inner wall and a magnetic circuit part, while securing weight of the magnetic circuit part in an inner structure by providing a guide groove and a projection part corresponding to behavior of the magnetic circuit part on the housing inner wall, and by using a dynamic structure using a frame-shaped suspension.

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 the housing via a suspension, whereby the acoustic reproduction unit and the magnetic circuit unit are provided. The present invention relates to a multi-function vibration actuator having a dynamic structure in which two are arranged opposite to each other.

  Currently, mobile communication devices such as multi-function mobile phones are mainly equipped with a sound playback function used when playing ringtones and various media, and a sensory vibration generation function used in manner mode. It has become. In some of such multifunctional portable terminals, multifunctional vibration actuators represented by the structure described in Japanese Patent No. 4553278 (hereinafter referred to as Patent Document 1) are used. The multi-function vibration actuator described in Patent Document 1 is based on a dynamic structure in which a sound reproducing unit to which a voice coil is attached and a magnetic circuit unit supported by a suspension and provided with a magnet are arranged to face each other. The technical feature is that the suspension is insert-molded in the housing. For this reason, the structure described in Patent Document 1 has an effect of improving the positioning accuracy of the magnetic circuit portion and improving the impact resistance by the protrusion provided on the yoke side. In addition, a structure described in Japanese Patent No. 4867703 (hereinafter referred to as Patent Document 2) is registered as a multi-function vibration actuator using the same dynamic structure, and a structure using a suspension outer ring portion as a stopper in addition to the basic structure. Is its technical feature.

Japanese Patent No. 4553278 Japanese Patent No. 4867031

  While having the technical features described above and the effects thereof, the structures described in Patent Documents 1 and 2 are limited in use from the suspension structure to a dynamic structure using a circular radial suspension structure. For this reason, it is difficult to satisfy the requirement for improving the space efficiency of the built-in components accompanying the integration in the integration of the internal structure of the multifunctional mobile phone which has been advanced in recent years. More specifically, the multi-function vibration actuators described in Patent Documents 1 and 2 have a problem that due to their structure, the space efficiency cannot be improved with respect to the square mounting space that is often configured in the mounting housing. ing.

  In order to solve the above-mentioned problems, the invention described in the present application can stabilize vibration characteristics and impart impact resistance, and can easily improve space efficiency with respect to a rectangular mounting space. The purpose is to provide.

  To achieve the above object, according to a first aspect of the present invention, in a multi-function vibration actuator having a dynamic structure using a frame-like suspension, a guide is provided along the vibration direction of the magnetic circuit portion, It features a structure in which the suspension fixing part protrudes. More specifically, for the magnetic circuit portion that vibrates in a linear manner by the frame suspension, the guide convex portion along the vibration direction is provided on the magnetic circuit portion side, and the groove portion is provided on the housing inner wall side. A technical feature is a structure in which an impact-resistant stopper is formed by projecting a suspension fixing portion at the end of the guide groove.

  In the second aspect of the present invention, the structure described in the first aspect is characterized in that the guide groove is provided at a symmetrical position with respect to the magnetic circuit portion. More specifically, the technical feature is that the plurality of guide grooves and the suspension fixing portions protruding at the end portions of the guide grooves are formed equidistant from the center of the magnetic circuit portion.

  By using the above-described structure, the multi-function vibration actuator according to the first aspect of the present invention can stabilize vibration characteristics and impart impact resistance in a square structure using a frame suspension. ing. In addition, it is possible to solve the problem of improving the space efficiency with respect to the square mounting space described in the prior art. These effects are achieved in a dynamic structure using a frame-shaped suspension, in which a guide is formed between the magnetic circuit portion and the inner wall of the housing, and a suspension fixing portion projects from one end of the guide groove provided on the inner wall of the housing. It becomes the effect by doing.

  In other words, since the multi-function vibration actuator of the present application uses a dynamic structure with a frame-like suspension as the drive structure, the vibration component of the magnetic circuit portion when the sensory vibration occurs is only the component in the thickness direction. Therefore, in the multi-function vibration actuator of the present application, the rotation of the magnetic circuit portion, which has occurred in the structure using the radial suspension, is eliminated at the time of the occurrence of the sensible vibration, and the distance between the outer periphery of the magnetic circuit portion and the inner wall of the housing is made constant. I can keep it. In this way, the outer dimensions of the magnetic circuit portion corresponding to the inner wall of the housing can be secured to the maximum by using the basic structure described in the present application. Further, by adjusting the air flow rate between the outer periphery of the magnetic circuit portion and the inner wall of the housing in the guide portion and using the air between the diaphragm and the magnetic circuit portion as a damper, an effect of stabilizing the vibration characteristics can be obtained.

  In addition, the guide structure can prevent the collision between the voice coil and the magnetic circuit section caused by the behavior in the tilt direction at the time of impact such as dropping, by the guide structure described above. This is an effect of the vibration component and the shape of the magnetic circuit portion. That is, in the multifunctional vibration actuator of the present invention, the vibration component of the magnetic circuit portion is only in the thickness direction by using the frame-shaped suspension. For this reason, by setting the gap between the magnetic circuit section and the inner wall of the housing in the guide section to be narrower than the gap between the voice coil and the magnetic circuit section, the collision in the tilt direction with respect to the vibration direction of the magnetic circuit section is prevented, Impact resistance can be imparted by a simple structure.

  Further, in the structure described in this aspect, a structure is used in which a part of the housing side fixing portion of the suspension that is insert-fixed in the housing is protruded from the end face of the guide groove portion. For this reason, in this aspect, it is possible to protect the end surface by the protruding housing-side fixing portion, and to prevent deformation on the end surface side due to a collision between the magnetic circuit portion and the end surface, which occurs during an impact such as dropping.

  Furthermore, the multi-function vibration actuator described in the present application uses a dynamic structure in which a sound reproduction unit is fixed to the end of the housing and a magnetic circuit unit is disposed opposite to the sound reproduction unit via a frame-like suspension as a drive structure. Yes. For this reason, the sound reproducing unit is configured by a diaphragm provided with a voice coil, and vibration of the voice coil is directly transmitted to the diaphragm, so that a sound quality with less distortion can be obtained. For the magnetic circuit section, a plate magnet magnetized in the thickness direction is sandwiched between a yoke and a pole piece made of a magnetic material, and the magnetic flux of the magnet is concentrated in a magnetic gap formed between the outer edge of the yoke and the pole piece. The structure is used. Therefore, by arranging the voice coil in the magnetic gap, the responsiveness of the sound reproducing unit and the magnetic circuit unit can be improved.

  In addition, by using the structure according to the second aspect of the present invention, it is possible to enhance the effects of stabilizing the vibration characteristics and impact resistance. This is an effect obtained by arranging the guide grooves in symmetrical positions with respect to the magnetic circuit portion. That is, by arranging the guide grooves symmetrically, it is possible to achieve a structure in which the mutual inclination amounts generated between the magnetic circuit portion and the housing in each guide are uniformed when experiencing vibrations. For this reason, the stability of the vibration characteristics can be improved by adjusting the range of the tilt amount allowable during the vibration of the magnetic circuit portion, and the impact is distributed to each guide portion at the time of the impact. In addition, the impact resistance can be improved.

As described above, by using the structure described in the claims of the present application, vibration characteristics can be stabilized and impact resistance can be imparted, and the square mounting space can be easily improved in space efficiency with respect to the square mounting space. A functional vibration actuator can be provided.

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 FIG. 1 is a cross-sectional side view taken along the A-A ′ and B-B ′ cross sections of FIG. 1. The perspective view of the guide part of the multi-function vibration actuator used in the embodiment of the present invention

  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.

  FIG. 1 is an overall perspective view of a multifunctional vibration actuator used in the best mode of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3 is a cross-sectional view taken along line AA ′ and BB ′ in FIG. FIG. 4 is a side sectional view of the cross section, and FIG. 4 is a perspective view of the guide portion of FIG.

  As can be seen from FIG. 1, the multi-function vibration actuator used in the present embodiment has a rectangular rectangular structure. As can be seen from FIGS. 2 and 3, the multi-function vibration actuator has a sound reproducing portion constituted by a diaphragm 3 provided with a voice coil 4 and a center cap 2 fixed to the end surface of the housing 5, and has a magnet 8 magnetic body. A magnetic circuit portion constituted by a weight 9 sandwiched between a pole piece 7 and a yoke 10 and fixed to the outer periphery of the yoke 10 is supported on the inner wall of the housing 5 via a frame-like suspension 6, whereby the sound reproducing portion and the magnetic circuit are supported. The dynamic structure with the parts facing each other.

  With such a structure, the multi-function vibration actuator described in the present embodiment uses a common mechanism for the sound reproduction function by the vibration of the sound reproduction part and the function for generating the sensation vibration by the vibration of the magnetic circuit part. Can do. More specifically, both functions can be used by setting the input signal to the voice coil 4 in the vicinity of the resonance frequency of each part. In addition, with respect to the input signal to the voice coil 4, it is possible to simultaneously output sound reproduction and body vibration by superimposing the resonance frequencies. In addition, in this embodiment, the frame-shaped suspension 6 is supported on the inner wall of the housing via two support portions m, two on each side. Therefore, by adjusting the distance between the support portions on each side, the behavior of the frame suspension 6 can be stabilized, and the stress inside the suspension can also be dispersed between the support portions.

  In addition to the technical characteristics of the basic structure and the effects obtained thereby, in this embodiment, it is possible to stabilize vibration and improve impact resistance by the guide structure. This is an effect obtained by projecting a part of the frame suspension 6 fixed to the inner wall of the housing to the end portion of the guide groove w provided on the inner wall of the housing as a stopper p. More specifically, the guide groove w shown in the BB 'cross section of FIG. 3 and FIG. 4 restricts the behavior of the magnetic circuit section, so that the magnetic circuit section and the voice coil can be affected even in the event of an impact such as dropping. In addition, it is possible to prevent a deformation on the housing side in the event of a collision between the magnetic circuit portion and the housing in which a part of the frame-like suspension 6 protruded from the guide end portion occurs in the thickness direction. became.

  2 and 3, in this embodiment, the magnet 8 is sandwiched between a pole piece made of a magnetic material and a yoke so that a magnetic gap g is formed in the magnetic circuit. For this reason, when the sound reproducing unit and the magnetic circuit unit are driven, the responsiveness can be improved by the concentrated magnetic flux. In addition, in this embodiment, the yoke 10 is formed by bending, and the guide convex portion y corresponding to the guide groove portion w on the housing side is formed on the outer periphery of the weight 9 provided on the outer side of the yoke 10. For this reason, the processing of the yoke 10 and the dimension adjustment of the weight 9 can be facilitated, and both the securing of the weight of the magnetic circuit portion and the provision of the impact resistance can be achieved.

  In addition to the effects described above, in the present embodiment, the guide groove w and the guide convex portion y are set to be symmetric with respect to the position of the center of gravity of the magnetic circuit portion. For this reason, while ensuring the maximum weight of the magnetic circuit section, the distance between the magnetic circuit section and the inner wall of the housing during normal driving is set to a minimum without interfering with the driving, and only when the aforementioned impact occurs. It was possible to provide a mechanism for protecting the structure. In the present embodiment, the mechanism limits the amount of air movement in the upper and lower spaces of the housing 5 with the magnetic circuit portion interposed therebetween. For this reason, when the sound reproducing unit and the magnetic circuit unit are driven, the air between the diaphragm and the magnetic circuit unit is used as a damper, and the effect of stabilizing the vibration characteristics can be provided.

As described above, by using the structure described in the embodiment of the present application, it is possible to stabilize the vibration characteristics and impart impact resistance, and it is easy to improve the space efficiency with respect to the square mounting space. A functional vibration actuator could be provided.

DESCRIPTION OF SYMBOLS 1 Grill 2 Center cap 3 Diaphragm 4 Voice coil 5 Housing 6 Frame type suspension 7 Pole piece 8 Magnet 9 Weight 10 Yoke 11 Cover 12 Contact terminal g Magnetic space m Support part p Stopper part w Guide groove part Y Guide convex part

Claims (2)

The diaphragm provided with the voice coil is fixed to the end surface of the housing having a cylindrical shape,
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,
Providing a guide convex portion and a guide groove corresponding to the convex portion on the magnetic circuit portion outer periphery and the housing inner wall,
A part of the housing side fixing portion of the suspension protrudes from the end portion of the guide groove,
The distance between the suspension and the magnetic circuit at the end of the guide groove is
A multi-function vibration actuator having a dynamic structure set shorter than a distance between the voice coil and the magnetic circuit section.
  The multifunctional vibration actuator according to claim 1, wherein the guide groove is provided at a symmetrical position with respect to the magnetic circuit portion.

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