JP2005269496A - Multifunctional vibration actuator and mobile terminal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology of preventing characteristic variations due to a shock caused by a fall or the like while reducing a man-hour and cost and making a vibration frequency characteristic flat. <P>SOLUTION: The outer edge 3a of a suspension 3 fixed to a magnetic circuit 2 and elastically deformable annular member 7 are clamped between the opening end 1b of a housing 1 and a cover 6, and pres-contacted by the elastic force of the annular member 7 so that the outer edge 3a of the suspension 3 cannot be moved from the opening end 1b of the housing 1, thereby fixing the housing 1 and the suspension 3 without the need of using a fixing means such as an adhesive, mold forming, and welding, and even when a shock is exerted to the housing 1 from its outside, the annular member 7 is compressed and deformed to absorb the shock thereby averaging the vibration frequency characteristic. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a multi-function vibration actuator that is mounted on a mobile terminal device such as a mobile phone or a small information communication terminal and notifies a user of an incoming call by sound or vibration with one device, and an assembling method thereof.
Specifically, in the housing, a magnetic circuit portion, a suspension that supports the magnetic circuit portion, a diaphragm that is disposed to face the magnetic circuit portion, and a magnetic gap portion of the magnetic circuit portion that is provided on the diaphragm are inserted into the housing. The present invention relates to a multifunctional vibration actuator and an assembling method in which a voice coil is housed and the opening end of the housing is covered with a cover.

Conventionally, as this type of multi-function vibration actuator, a plurality of protrusions provided at equal intervals on the outer edge of the suspension are fitted into a notch step provided in the frame of the housing (housing) and bonded together. When the outer edge of the suspension is fixed to the housing and the signal current of the voice signal is applied to the voice coil, the diaphragm vibrates to generate a ringtone, melody, voice, music, etc. And a mechanical vibration system including a magnetic circuit and a suspension vibrates, and this vibration is transmitted through the housing to the entire portable terminal device on which the multi-function vibration actuator is mounted (for example, see Patent Document 1). ).
Some suspensions are integrated with a housing (vibration transmission portion) by insert molding, welding, adhesion, or the like (see, for example, Patent Document 2).

JP 2002-191092 A (page 2-4, FIGS. 8-11) Japanese Patent Laid-Open No. 2002-219413 (page 3, FIG. 1)

However, in such a conventional multi-function vibration actuator, the housing and the suspension are fixed by bonding using an adhesive or by insert molding, so that when the impact such as dropping acts, There is a problem that the vibration characteristics due to the pension fluctuate.
Furthermore, in the case of the adhesion | attachment using an adhesive agent, there existed a problem that a man-hour increased and management of an adhesive agent was difficult.
In the case of molding, there is a problem that the mold structure becomes complicated and the ability of the mold becomes a problem and the productivity is poor, and in the case of welding, a welding facility is required and the cost is increased.

The invention according to claim 1 of the present invention aims to prevent fluctuations in characteristics due to impacts such as dropping and to flatten the frequency characteristics of vibration while reducing man-hours and costs.
The inventions described in claims 2 and 3 are intended to facilitate assembly and reduce manufacturing costs.

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention is characterized in that an outer edge portion of a suspension fixed to a magnetic circuit portion and an elastic deformation between an open end of a housing and a cover covering the housing. The outer edge portion of the suspension is pressed against the opening end of the housing so as to be immovable with a possible annular member interposed therebetween.
The elastically deformable annular member referred to here is an O-ring or the like.
The invention described in claim 2 is characterized in that the structure of the invention described in claim 1 is provided with a structure in which a locking means for fitting and locking the joint portion between the housing and the cover is provided from the approach of each other. And
According to a third aspect of the present invention, an elastically deformable annular member is placed on the cover, and then the outer edge portion of the suspension fixed to the magnetic circuit portion is stacked, and the housing on which the diaphragm and the voice coil are previously attached is lowered. By bringing them close to each other, the locking means provided at the joint between the housing and the cover are fitted and locked, and all the parts are assembled together.

According to the first aspect of the present invention, the outer edge portion of the suspension fixed to the magnetic circuit portion and the elastically deformable annular member are sandwiched between the open end of the housing and the cover. By elastically pressing the outer edge of the suspension against the opening end of the housing in an immovable manner, the housing and the suspension can be fixed without using adhesive, molding, welding, or other fixing means. Even when an impact is applied, the annular member is compressed and deformed to absorb the impact, and the frequency characteristics of vibration are averaged.
Therefore, it is possible to prevent fluctuations in characteristics due to an impact such as dropping, and to flatten the frequency characteristics of vibration while reducing man-hours and costs.
Furthermore, by changing the size and hardness of the annular member, the pressing force on the suspension changes, and the resonance frequency of vibration can be adjusted.
Moreover, since it has a buffering action by elastic deformation of the annular member, the vibration characteristics can be improved as compared with fixing such as adhesion.

According to the second and third aspects of the present invention, after mounting the annular member on the cover, the outer edge portions of the suspension fixed to the magnetic circuit portion are stacked, and the housing on which the diaphragm and the voice coil are previously attached is lowered from above to approach each other. By doing so, the locking means are fitted and locked, and all these components are assembled together.
Therefore, the assembly can be facilitated and the manufacturing cost can be reduced.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 5, the multi-function vibration actuator A according to the present invention includes a magnetic circuit portion 2, a suspension 3 that elastically supports the magnetic circuit portion 2, and a suspension 3. A diaphragm 4 disposed opposite to the magnetic circuit portion 2 and a voice coil 5 fixed to the diaphragm 4 and inserted into the annular magnetic gap portion 2a of the magnetic circuit portion 2 are provided. When input, the diaphragm 4 slightly vibrates to generate a sound such as a ringtone, melody sound, voice, music, etc. When a signal current having a vibration frequency of 120 to 160 Hz flows, the weight including the magnetic circuit unit 2 and the suspension 3 is generated. A certain mechanical vibration system is vibrated greatly.

  The housing 1 is a cylindrical housing that accommodates the magnetic circuit portion 2, and the outer peripheral portion 4 a of the diaphragm 4 is fixed to an opening end 1 a of one (upper in the drawing) with an adhesive or the like, and the other (drawing). The bottom cover 6 is detachably attached to the lower open end 1b.

  Between the other open end 1 b of the housing 1 and the cover 6, an outer edge 3 a of the suspension 3 fixed to the covering magnetic circuit portion 2 and an elastically deformable annular member 7 are sandwiched between the other ends of the housing 1. The outer edge 3a of the suspension 3 is pressed against and fixed to the open end 1b.

The annular member 7 is an O-ring formed of an elastic material such as synthetic rubber, for example. As shown in FIGS. 1, 3, and 5, the outer periphery of the bottom of the cover 6 is opposed to the outer edge 3 a of the suspension 3. It is arranged along.
Further, it is preferable to prepare a plurality of types of annular members 7 having different shapes, different sizes in the vertical thickness direction, and different hardnesses, and selecting them according to the situation.

Then, a locking means 8 is provided at the joint portion between the housing 1 and the cover 6 so as to be fitted and locked when they are close to each other.
In the case of the present embodiment, as shown in FIGS. 3 and 5, the side peripheral wall 6a of the bottomed cylindrical cover 6 and the lower peripheral side wall 1c of the housing 1 are formed so as to be fitted to each other. A plurality of locking projections 8a and locking recesses 8b are formed on the surface as the locking means 8 at equal intervals in the circumferential direction.

  In the illustrated example, the outer diameter of the lower peripheral side wall 1c of the housing 1 and the inner diameter of the side peripheral wall 6a of the cover 6 are fitted to be substantially the same, and the locking convex portion 8a is provided on the outer surface of the lower peripheral side wall 1c of the housing 1. Protruding and penetrating and penetrating the locking recess 8b in the inner surface of the side peripheral wall 6a of the cover 6 facing this, but the fitting structure and the shape of the locking means 8 are not limited to those shown in the figure, If there is a similar function, the locking projections 8a and the locking recesses 8b may be arranged in reverse, or may have other structures and shapes.

  The suspension 3 is a ring-shaped leaf spring, and a central hole 3b that fits in a magnetic circuit portion 2 described later at the center thereof, an annular portion 3c that surrounds the central hole 3b and contacts the magnetic circuit portion 2, An arm 3d that flexes and deforms by connecting the annular portion 3c and the outer edge portion 3a is formed, and the annular portion 3c is integrally fixed to the magnetic circuit portion 2 by laser welding or adhesion, and the outer edge By fixing the portion 3 a to the other opening end 1 b of the housing 1, the magnetic circuit portion 2 is elastically supported at a position facing the diaphragm 4.

  In the case of the present embodiment, as shown in FIGS. 4 and 5, a plurality of through holes 3e through which laser welding lasers pass are previously opened at a plurality of positions at equal intervals in a plurality of locations of the annular portion 3c. By selecting the through hole 3e corresponding to the characteristics of the suspension 3 to be mounted and the weight of the magnetic circuit portion 2 from the plurality of through holes 3e, and changing the laser irradiation position toward this, laser welding is performed. By changing the length from the laser welding position to the outer edge 3a of the suspension 3 fixed to the other opening end 1b of the housing 1, that is, the vibration center position, the desired frequency is adjusted to the vibration by the suspension 3.

  The diaphragm 4 is a diaphragm that is formed in an elastic material such as polycarbonate, polyetherimide, polyimide, polyethylene phthalate plastic film or the like, and is formed into a flat circular shape with an appropriate thickness. The annular rising portion 4b is bent to be bent along, and the outer peripheral portion 4a extending in parallel with the flat surface of the one opening end 1a of the housing 1 is bent from the rising portion 4b.

  Further, an annular mounting portion 4c is formed at a substantially middle position of the radius of the diaphragm 4, and the end surface of the voice coil 5 is fixed to the rear surface of the diaphragm 4 with an adhesive or the like to the annular magnetic gap portion 2a of the magnetic circuit portion 2. Concentric curved surface portions 4d and 4e projecting outward are bent at the center side and the outer peripheral side of the coil attachment portion 4c.

  The voice coil 5 is wound in a cylindrical shape, and as shown in FIG. 2, the lead wire 5a is attached to the back surface of the diaphragm 4 with an adhesive or the like so as not to adversely affect the vibration. Is led out toward a terminal block 1d provided outside the housing 1, and is electrically joined to a terminal fitting 1e provided on the terminal block 1d by soldering or bonding.

  The magnetic circuit section 2 is configured by overlapping a yoke 9, a disk-shaped magnet 10, and a disk-shaped pole piece 11 on a concentric axis.

  The yoke 9 is made of a magnetic material and has a bottomed cylindrical shape, and its outer peripheral surface 9 a is positioned with a small gap (for example, 0.05 to 0.2 mm) from the inner peripheral surface of the housing 1. And an abutting surface 9b opposed to the annular step portion 1f formed on the inner peripheral surface of the housing 1 is formed so that the two abut against each other when the magnetic circuit portion 2 vibrates. The movement due to impact is limited.

Further, in the case of the present embodiment, a convex portion 9c that fits with the central hole 3b of the suspension 3 is provided on the lower surface of the yoke 9, and the annular portion of the suspension 3 is formed in the concave portion 9d formed around the convex portion 9c. 3c contacts and is fixed integrally by laser welding or the like.
If necessary, a counterbore (not shown) having a diameter substantially the same as the diameter of the magnet 10 may be provided in the center of the bottom to position the magnet 10.

  The pole piece 11 is formed in a disk shape that is approximately the same diameter as or larger than the diameter of the magnet 10, and in order to position the magnet 10 on the bottom surface as necessary, the diameter of the magnet 10 is approximately the same. A counterbore (not shown) having the same diameter may be provided in a recessed manner. It is further preferable that the displacement of the magnet 10 in the radial direction is restricted by sandwiching the magnet 10 between this and the counterbore portion of the yoke 9.

Next, a method for assembling such a multi-function vibration actuator A will be described according to a procedure.
As shown in FIG. 3, first, the diaphragm 4 and the voice coil 5 are integrally attached to the housing 1, and the suspension 3 is integrated with the yoke 9 of the magnetic circuit portion 2 by laser welding so as to be integrated with the entire magnetic circuit portion 2 to form a bottomed cylindrical shape. An annular member 7 is placed in the cover 6 and placed along the side peripheral wall 6a.

  Then, the outer edge portion 3a of the suspension 3 integrated with the magnetic circuit portion 2 is stacked on the annular member 7, the housing 1 to which the diaphragm 4 and the voice coil 5 are attached is lowered, and the other opening is opened. The outer edge 3a of the suspension 3 and the annular member 7 are sandwiched between the end 1b and the cover 6.

  Thereby, the lower peripheral side wall 1c of the housing 1 and the side peripheral wall 6a of the cover 6 are fitted close to each other, and at the same time, the locking convex portion 6a and the locking concave portion 6b of the locking means 8 provided on both of them are fitted. The housing 1, the magnetic circuit unit 2, the suspension 3, the diaphragm 4, the voice coil 5, the cover 6, and the annular member 7 which are all components are assembled together, and the assembly is completed.

Therefore, the housing 1 and the suspension 3 can be fixed without using an adhesive, mold forming, welding, or other fixing means, and even if an impact is applied from the outside of the housing 1, the annular member 7 is compressed and deformed to absorb the impact. The frequency characteristics of vibration are averaged.
As a result, while reducing man-hours and costs, it is possible to prevent characteristic fluctuations due to impact such as dropping and to flatten the frequency characteristics of vibration.
Further, by changing the size and hardness of the annular member 7, the pressure contact force with respect to the outer edge portion 3 a of the suspension 3 changes, whereby the resonance frequency of vibration can be adjusted.

  The structures and shapes of the housing 1, the magnetic circuit unit 2, the suspension 3, the diaphragm 4, the voice coil 5, the cover 6, and the annular member 7 described in the previous embodiment are not limited to those illustrated, Other structures and shapes may be used as long as they have similar functions.

It is a vertical front view of the multifunction type vibration actuator which shows one Example of this invention. FIG. It is a vertical front view which shows the state decomposed | disassembled according to the assembly procedure. It is a reduced bottom view showing a state in which a suspension is fixed to a magnetic circuit unit. It is a disassembled perspective view.

Explanation of symbols

1 Housing 1b Open end (the other open end)
DESCRIPTION OF SYMBOLS 2 Magnetic circuit part 2a Magnetic space | gap part 3 Suspension 3a Outer edge part 4 Diaphragm 5 Voice coil 6 Cover 7 Ring member 8 Locking means

Claims (3)

In the housing (1), a magnetic circuit part (2), a suspension (3) for supporting the magnetic circuit part (2), a diaphragm (4) disposed opposite to the magnetic circuit part (2), and this A voice coil (5) that is provided on the diaphragm (4) and is inserted into the magnetic gap (2a) of the magnetic circuit (2) is accommodated, and the open end (1b) of the housing (1) is covered (6 ) Multifunctional vibration actuator covered with
Between the open end (1b) of the housing (1) and the cover (6) covering it, the outer edge portion (3a) of the suspension (3) fixed to the magnetic circuit portion (2) and elastically deformable A multifunctional vibration actuator characterized in that the outer edge (3a) of the suspension (3) is brought into immovable contact with the open end (1b) of the housing (1) by sandwiching the annular member (7). The multi-function vibration actuator according to claim 1, wherein a locking means (8) for fitting and locking is provided at a joint portion between the housing (1) and the cover (6) when approaching each other. In the housing (1), a magnetic circuit part (2), a suspension (3) for supporting the magnetic circuit part (2), a diaphragm (4) disposed opposite to the magnetic circuit part (2), and this A voice coil (5) that is provided on the diaphragm (4) and is inserted into the magnetic gap (2a) of the magnetic circuit (2) is accommodated, and the open end (1b) of the housing (1) is covered (6 In the assembly method of the multi-function vibration actuator covered with
After mounting the elastically deformable annular member (7) on the cover (6), the outer edge portion (3a) of the suspension (3) fixed to the magnetic circuit portion (2) is stacked, and from above the diaphragm (4 ) And the voice coil (5) attached to the housing (1) are lowered and brought close to each other, thereby engaging the locking means (8) provided at the joint between the housing (1) and the cover (6). A method for assembling a multi-function vibration actuator, wherein all parts are assembled together by locking.

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