JP2004357416A - Feeding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor equipped with a feeding device that secures stable electrical contact and high reliability in its life by suppressing surges and harmonic oscillations, that is good in assembly workability, and that has versatility as a component, too. <P>SOLUTION: On a part of a position near one end of a motor 10, a pair of feeding terminals 11 are provided positioned at the other end of the motor 10. Furthermore, a pair of electrodes 41 positioned at the feeding terminals 11 and supplying electric power to the motor 10 are provided on a circuit board 40. The feeding device 50 whose side is partially fixed to the side of the motor 10 with an adhesive or a double-sided tape is gripped between the feeding terminals 11 and the electrodes 41 so formed, and the electrodes 41 of the circuit board 40 are each electrically connected to the feeding terminals 11 of the motor 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
[Industrial applications]
The present invention relates to a power supply device of a DC motor for a vibration generator mainly mounted on a portable device such as a pager.
[0002]
[Prior art]
In recent years, each electronic component mounted on a portable device is often of a surface mount type, and is being wired to a printed wiring board by reflow soldering.
Conventionally, components that cannot be reflow soldered are wired by hand soldering or connector type non-soldering. However, in practice, the manual soldering method has problems of poor work efficiency and poor after-maintenance.
[0003]
In addition, the connector type has a problem that the socket portion is expensive, the mounting operation including soldering operation of the socket portion is complicated, and furthermore, the mounting of the socket portion does not allow a thin and small size. For these reasons, a solderless contact method that solves these problems has been frequently used recently.
[0004]
As this solderless contact method, a method utilizing the compressibility of a coil spring is known, and recently, this method has begun to be used for mounting a flat type vibration motor of a vibration generating device of a portable telephone device.
In some cases, a conductive compression coil spring inserted into a cylindrical projection of a housing is provided between a coil power supply terminal portion of a motor and an electrode provided on a circuit board to perform electrical connection. (See, for example, Reference 1)
Further, in order to reduce the thickness, there is a type in which a pair of coil springs through which a rubber damper for fixing a motor body is inserted are interposed between a power supply terminal portion of the motor and an electrode of a circuit board to perform electrical connection. . (See, for example, Reference 2)
[0005]
Further, in order to stabilize electrical contact, a coil spring, which is housed in a resin-made cylindrical spring guide provided on a bracket of the motor and one end of which is soldered to an external terminal of the motor, is provided on the circuit board. It is surrounded by one that makes electrical connection by contacting the electrodes (see, for example, Patent Document 3) or a part of an insulating elastic body that holds the motor body and is fixed to the external terminals of the motor. In some cases, a coiled spring is interposed between a power supply terminal of the motor and an electrode of a circuit board to make electrical connection. (See, for example, Reference 4)
[0006]
[Patent Document 1] Japanese Utility Model Application Laid-Open No. 2-141883 [Patent Document 2] Japanese Patent Application Laid-Open No. 8-140301 [Patent Document 3] Japanese Patent Application Laid-Open No. 10-117460 [Patent Document 4] Japanese Patent Application Laid-Open No. 2002-44907 ]
[Problems to be solved by the invention]
However, a coil spring tends to cause a resonance phenomenon called surging.
Further, this surging may cause an electrical contact failure such as peeling of the plating of the noble metal applied to the contact portion of the coil spring or the surface of the electrode or movement of the contact point. Further, this surging also causes a problem of shortening the service life when the coil spring is broken. Further, the coil spring may not be able to suppress high-frequency vibrations that hinder normal electrical contact.
In view of effective use of resources and reduction in size and thickness of the device, it was necessary to minimize the size of the insulating elastic body (cushion) for suppressing the play of the motor. Further, there is a problem that the assembling work must be simplified, such as stopping the soldering work, and the versatility of the mounted components must be expanded to improve the production efficiency.
[0008]
Therefore, the present invention solves the above-mentioned problems, and in particular, secures stable electrical contact and reliability that withstands severe vibration, and also has good workability, and a flat motor having high versatility as a component. It is intended to provide a power supply device.
[0009]
[Means for achieving the object]
The above object is attained by sandwiching between a flat power supply terminal led out to the side of the motor and an electrode of a circuit board facing the pole of the power supply terminal, as in the invention of claim 1. A power supply device having an elasticity for electrically connecting the power supply device, the power supply device accommodates a metal spring corresponding to the number of poles for short-circuiting the pole of the power supply terminal and the electrode of the circuit board, and accommodates the spring. The insulating member is formed of an insulating elastic member, and the elastic member has the same number of holes as the number of springs in which the springs are housed, and has a thickness dimension shorter than the free length of the spring. It is formed wider than the distance between the power supply terminal and the electrode of the circuit board, and in the sandwiching, the spring and the elastic member simultaneously press the pole of the power supply terminal and the electrode of the circuit board to provide stable electrical contact and severe High enough to withstand severe vibrations It can be achieved ensuring dependability.
[0010]
Further, if the spring is a compression coil spring as in the invention according to the second aspect, the spring can be easily mounted in the hole provided in the elastic member as described in the third aspect, and the moldability of the elastomer or the like can be improved. It can be easily molded integrally with a good elastic member.
If the spring is a leaf spring, a large number of power supply devices can be easily formed by continuously molding the spring.
Further, by mounting at least one side of the power supply device to at least a part of the flat motor, it is possible to achieve improvement in workability and improvement in parts procurement efficiency.
In manufacturing the power supply device, the power supply device may be integrally formed, and a large number of power supply devices may be formed at the same time.
[0011]
[First Embodiment]
FIG. 1 is a cross-sectional view of a main part showing an embodiment of the present invention. The flat type motor 10 that generates vibration is mounted between cushions 61 and 62 between an upper housing 20 and a circuit board 40 mounted on a lower housing 30 of the mobile phone device. A flat power supply terminal 11 is provided on the side near the other end of the motor 10. The power supply terminal 11 has a flat plate shape and faces the other end of the motor 10. The circuit board 40 is provided with a pair of electrodes 41 for supplying power to the motor 10 with a printed pattern surface. Between the power supply terminal 11 and the electrode 41 thus formed, a power supply device 50 whose side surface is partially fixed to the side surface of the motor 10 with an adhesive or a double-sided tape adhesive member 70 is sandwiched. The electrode 41 and the power supply terminal 11 of the motor 10 are electrically connected to each other. The upper housing is provided with a guide 21 for preventing the motor 10 from moving in the radial direction, which is arranged in an annular shape or similar to the outer diameter of the motor.
[0012]
FIG. 2 is an exploded perspective view showing the configuration of the power supply device 50. In FIG. 2, the power supply device 50 includes a pair of coil springs 51 and a damper 52 used for compression. The coil spring 51 is formed of a metal wire having a circular or square cross section. On the other hand, the damper 52 is made of an elastic member made of synthetic rubber such as natural rubber or urethane rubber, or a foam of such rubber, or an elastomer having good moldability. The damper 52 has a pair of vertical holes 52a and 52b. The inner diameters of the holes 52a and 52b are set to the same size as or smaller than the outer diameter of the coil spring 51, and to a size that allows the coil spring 51 to be inserted.
The thickness b of the damper 52 in the direction sandwiched between the power supply terminal 11 and the electrode 41 is larger than the distance a between the power supply terminal 11 and the electrode 41 (shown in FIG. 1). c is formed larger than the thickness dimension b of the damper 52.
[0013]
Since the outer shape of the power supply device 50 according to the present invention shown in FIGS. 1 and 2 has a substantially cubic shape, a double-sided adhesive tape or the like is provided on a side surface 52c parallel to the direction in which the holes 52a and 52b of the damper 52 penetrate. The adhesive member 70 is attached and mounted on the side surface of the motor 10 where the power supply terminal 11 of the motor 10 is located. The power supply terminal may be attached to at least a part of the power supply terminal.
When this mounting is performed by an adhesive method, an adhesive having elasticity may be used. Further, the entire coil spring 51 may be plated with a noble metal. Further, the damper 52 may be formed of a synthetic resin foam structure to have elasticity and flexibility, or the coil spring 51 may be formed integrally with the damper 52.
[0014]
FIG. 3A is a cross-sectional view illustrating a state where the coil spring 51 is inserted into the holes 52a and 52b of the damper 52. The outer diameter of the coil spring 51 is set to be equal to or slightly smaller than the inner diameter of the holes 52a and 52b. In this case, the coil spring 51 can be easily inserted into the holes 52a and 52b because the damper 52 itself has elasticity.
After the insertion, the inner surfaces of the holes 52a and 52b press the outer surface of the coil spring 51, so that they do not easily fall off. Since the free length of the coil spring 51 is set to be longer than the thickness of the damper 52, the end of the inserted coil spring 51 is exposed from both ends or one side of the damper 52.
[0015]
FIG. 3B shows another example of the end shape of the coil spring 51. The coil spring 51b has its end 51c bent in the coil winding axis direction so that the cut end face faces the power supply terminal 11.
When the cut end surface is brought into contact with the pattern surface of the power supply terminal 11 in this manner, reliable conduction can be obtained by protruding the pattern surface at the cut end surface.
Further, the end portions 51c are brought close to each other and positioned adjacent to each other. In general, the power supply portion of the motor 10 is small, and the pole interval between the power supply terminals 11 is often very small. Even in such a case, it is necessary to surely bring the end portion into contact with the pattern surface. If the ends 51c are adjacent to each other, the coil springs can be reliably brought into contact with the pattern surfaces of the poles having a small interval.
The distance between the end portions 51c can be easily set by rotating the coil spring 51, so that the end portions 51c can be adjusted to the power supply terminal pattern surfaces at various intervals.
Since such a configuration in which the end is bent can be used also on the electrode 41 side, it is possible to cope with various types of power supply terminals and electrodes by changing the position setting of the end of the spring.
[0016]
FIG. 4 is a perspective view showing a state in which the power supply device 50 configured as described above is attached to a side surface of the motor 10. The damper 52 is fixed to the side surface of the motor 10 by an adhesive member 70 so that one end of the coil spring 51 rides on each of the poles 11a and 11b of the power supply terminal 11. Further, the motor 11 on which the power supply device 50 is mounted as described above is fitted into the guide 21 of the upper housing 20. The guide 21 has a notch 21a facing the electrode 41 of the circuit board 40 shown in FIG. 1, and the power supply terminal 11 of the motor 10 is fitted into the notch 21a without play.
Although the guide 21 is shown in a cylindrical shape in FIG. 4, a pillar-shaped guide according to the outer diameter of the motor may be arranged in an annular shape.
[0017]
FIG. 5 is an enlarged cross-sectional view of a main part showing the vicinity of a power supply unit of the motor 10 in FIG. 5, the coil spring 51 is sandwiched between the pole of the power supply terminal 11 and the electrode 41 of the circuit board 40. In other words, the coil spring 51 presses the pole of the power supply terminal 11 and the electrode 41 of the circuit board 40, and short-circuits between the respective poles to form electrical conduction. Similarly, the damper 52 is sandwiched between the power supply terminal 11 and the electrode 41 of the circuit board 40. In other words, the damper 52 presses the periphery of the contact portion between the power supply terminal 11 and the coil spring 51 of the electrode 41 of the circuit board 40.
[0018]
If the power supply device 50 including the coil spring 51 and the damper 52 is formed in advance in a state where the coil spring 51 is inserted into the opening of the damper 52, the power supply device 50 can be mounted on the motor as needed, so that the mounting operation can be simplified. Further, there is an advantage that the power supply device 50 can be used in common even if the type of the motor is different. In addition, by attaching the power supply device 50 to the motor 10 and supplying the power, the assembly work can be simplified in the production process of a mobile phone device or the like.
Further, since the damper 52 can select vibration damping characteristics different from those of the cushions 61 and 62 for suppressing the play at the top and bottom of the motor 10, it is possible to have more excellent vibration damping characteristics.
[0019]
FIG. 6 shows the spring characteristics of the coil spring 51 and the damper 52.
In FIG. 6, the X axis represents the amount of deflection or compression, and the Y axis represents the load or pressing force. As can be seen from this characteristic diagram, the coil spring 51 has a linear characteristic because it is formed of a metal wire, and the damper 52 has a spring characteristic of a non-linear characteristic because it has a rubber spring structure. The load-deflection characteristics of the spring shown in this characteristic diagram can be replaced with the compression-pressure characteristics of the spring.
[0020]
Here, in the state configured as described above, the distance a between the power supply terminal 11 and the electrode 41, the thickness b of the damper 52, the free length c of the coil spring 51, and the length of the coil spring 51 exposed from the damper 52 are set. Assuming that S1 is S1 and the compression amount of the coil spring 51 is S2, the following relationship is established.
S1 = c−b
S2 = ca = S1 + ba
This will be described with reference to FIG. 6. When the upper housing 20 and the lower housing 30 start to be combined, the coil spring 51 first compresses the amount of S1. The amount of S2 is compressed. Thus, the pressing force of the damper 52 in the compression S2 is P1, and the pressing strength of the coil spring 51 is P2. FIG. 6 shows that P2 is much larger than P1. This indicates that the damper 52 is pressing the power supply terminal and the electrode, and the coil spring 51 is pressing the contact portion with a stronger force.
[0021]
As described above, the pressing force of the coil spring 51 is much stronger than that of the damper 52, and the coil springs 51 operate independently of each other, so that there is no possibility of poor electrical contact. Further, since the damper 52 has a time delay of the following of the stress to the stress due to the viscoelasticity peculiar to the rubber spring, the insulating effect against the high frequency is remarkably large, and the contact between the end of the coil spring 51 and the electrode 41 or the pole of the power supply terminal 11 is caused. The micro vibration applied to the portion can be absorbed, and thereby the vibration can be prevented from abrasion of the contact surface and the peeling of the plating, so that there is an effect of maintaining a stable contact.
[0022]
Further, since the coil spring 51 is made of metal, surging is easily caused by a resonance phenomenon. However, from the beginning, the holes 52a and 52b of the damper 52 are each in contact with the outer diameter of the coil spring 51, and the damper 52 has a volume-invariant non-compressive property against the deformation peculiar to the rubber spring. A part of the inner diameter of the holes 52a and 52b is narrowed by being sandwiched and pressed between the circuit board 40 and the circuit board 40 mounted on the lower housing, and the surface thereof pushes the outer diameter of the inserted coil spring 51. As a result, a part of the vibration applied to the coil spring 51 is absorbed or the amplitude of the spring is delayed, so that surging hardly occurs. As a result, there is no possibility of sudden disconnection of the contact portion due to surging or breakage even if the coil spring 51 is used with severe vibration for a long time.
[0023]
In the power supply device according to the above embodiment, a coil spring is mounted on an elastic member having an opening, and the power supply device 50 is manufactured in advance.
In order to manufacture such a power supply device, it is possible to use a method of simultaneously molding a spring when an elastic member is molded by injection molding.
FIG. 7 shows a step of integrally molding the compression coil spring as a power supply device simultaneously with the molding of the elastic member using an elastomer having good moldability.
[0024]
As shown in FIG. 7, a mold used for injection molding is composed of an upper mold 69 and a lower mold 66.
The lower mold 66 includes a lower mold 64 having a cavity 63 into which the elastomer E forming the damper 62 is injected, and a pin 65 to which the coil spring 61 is mounted.
The upper mold 69 includes an upper mold 68 in which an insertion hole 67 into which the pin 65 is inserted is formed.
The depth of the cavity 63 is set to the height b of the damper 62, and a compression coil spring 61 having a free length c is mounted on the pin 65. (FIG. 7 (a))
[0025]
When the upper mold 69 and the lower mold 66 are clamped, the pin 65 is inserted into the insertion hole 67, and the coil spring 61 is compressed to the height b.
When the elastomer E is injected into the cavity 63 in this state, the coil spring 61 is formed integrally with the damper 62 in a compressed state. (FIG. 7 (b))
When the integrally formed damper 62 and coil spring 61 are taken out of the mold, the coil spring 61 extends to a free length c. Both ends of the extended coil spring 61 project from the damper 62.
By integrally molding in this manner, it is possible to mount the power supply device on the pin more easily than mounting the spring in the hole of the damper, and it is possible to produce a large number of power supply devices at once by increasing the number of dies.
Also, since the shape of the cavity can be set relatively freely, it is possible to match the shape of the motor to be mounted.
[0026]
8 and 9 show another embodiment of the power supply device. The power supply device 80 includes a leaf spring 81 that utilizes bending and a damper 82. In other configurations, the same components as those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.
The upper part 81 a of the leaf spring 81 formed in a substantially C shape is in contact with the power supply terminal 11, and the lower part 81 b is in contact with the electrode 41. The free length f of the upper part 81a and the lower part 81b is larger than the distance a between the electrode 41 and the power supply terminal 11, and is larger than the dimension b of the damper 82.
[0027]
In order to form the power supply device 80, as shown in FIG. 9A, the leaf spring 81 is compressed and mounted on a lower die 86 having a cavity 83 set to a width dimension b, and an upper die 89 is formed. After the mold is clamped, the elastomer E is injected into the cavity 83.
Thereafter, when the power supply device 80 is removed from the mold, the upper portion 81a and the lower portion 81b of the leaf spring 81 are released from the compression and protrude from the damper 82, and the interval therebetween becomes a free length f.
When the leaf spring is used as the spring, the leaf spring 81 can be formed in a continuous state as shown in FIG. A large number of power supply devices can be easily manufactured by cutting the connecting portion 81c after attaching a continuously formed leaf spring to a mold.
In the above-described embodiments, the power supply terminal 11 or the electrode 41 is paired. However, the number of conducting portions is not limited to this, and a plurality of conducting portions can be provided. Further, the arrangement of the springs is not limited to one row, and various arrangements such as a triangular arrangement and a plurality of equilibrium arrangements are possible.
[0028]
【The invention's effect】
As described above, according to the first aspect of the present invention, the surging or the gap between the flat plate-shaped power supply terminal led out to the side of the motor and the electrode of the circuit board facing the pole of the power supply terminal. High-frequency vibration can be suppressed, stable electrical contact can be obtained, and highly reliable conduction can withstand severe vibration.
[0029]
Further, according to the configurations of claims 2 to 4, the power supply device can be easily formed, and according to the configuration of claim 5, the power supply device can be easily mounted on the motor and used.
Further, according to the manufacturing method of the sixth aspect, since the spring and the elastic member can be integrated at the same time, it is possible to manufacture a large amount and quickly.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.
FIG. 2 is an exploded perspective view showing the configuration of the power supply device shown in FIG.
FIG. 3 is a sectional view of the power supply device shown in FIG.
FIG. 4 is a perspective view of a motor equipped with a power supply device according to the present invention.
FIG. 5 is an enlarged sectional view of a main part around the power supply device shown in FIG. 1;
FIG. 6 is a diagram showing spring characteristics of a coil spring and a damper according to the present invention.
FIG. 7 is a diagram illustrating a method of manufacturing the power supply device illustrated in FIG. 1;
FIG. 8 is a cross-sectional view of a main part showing another embodiment of the present invention.
9 is a diagram illustrating a method for manufacturing the power supply device illustrated in FIG.
10 is a perspective view of one component used in the power supply device shown in FIG.
[Explanation of symbols]
Reference Signs List 10 Motor 11 Power supply terminal 20 Upper housing 21 Guide 30 Lower housing 40 Circuit board 41 Electrode 50 Power supply device 51 Coil spring 52 Dampers 61, 62 Cushion 70 Adhesive member

Claims (6)

A flat-shaped power supply terminal led out to the side of the motor and a power supply device having elasticity for electrically connecting them by being sandwiched between electrodes of a circuit board opposed to the poles of the power supply terminal, The power supply device includes a metal spring corresponding to the number of short-circuits between the poles of the power supply terminal and the electrodes of the circuit board, and an insulating elastic member that accommodates the spring. The same number of holes as the number of springs to be accommodated are formed, the thickness dimension thereof is shorter than the free length of the spring, and wider than the gap between the power supply terminal and the circuit board. And the elastic member simultaneously presses a pole of the power supply terminal and an electrode of the circuit board. The power supply device according to claim 1, wherein the spring is a compression coil spring. The power supply device according to claim 2, wherein the hole is formed in the elastic member in advance, and the compression coil spring is inserted into the hole. The power supply device according to claim 1, wherein the spring is a plate-shaped spring that utilizes bending. The power supply device according to claim 1, wherein at least one side surface of the power supply device is mounted on at least a part of the motor. A step of mounting a spring in the injection molding die, and a step of compressing the spring, wherein the compressed spring is housed, the mold is clamped, and an elastic member is injected into the die to form a power supply device. And a step of taking out the formed power supply device from the mold, expanding the compressed spring and projecting from the surface of the elastic member.

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