JP2001028860A - Electromagnetic vibrator and battery driver using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the resistance for vibration and impact of an electrical connecting portion and also improve reliability of a battery driver in an electro- magnetic vibrator used in such a battery driver. SOLUTION: A battery driver comprises a vibration generating mechanism consisting of a motor 1 and an eccentric weight 2, a plate spring type power feeding terminal 4 that is led from the vibration generating mechanism and is electrically connected with a power feeding land 13 of the driver, and an elastic body 6 provided at the rear side of the power feeding terminal 4. When the vibration generating mechanism is incorporated in the driver, the power feeding terminal 4 is pushed toward the power feeding land 13 with a composite force of a pushing force of the elastic body 6 and an elastic force of the same power feeding terminal 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic vibrator mainly used for battery-powered equipment, and more particularly, to an electric connection structure with the equipment.

[0002]

2. Description of the Related Art Some portable information devices such as a battery-operated device (hereinafter referred to as a device), especially a portable telephone and a PIM (personal information management) device, transmit information by bodily sensation vibration. The vibration generation method is often an electromagnetic drive method in terms of cost and energy efficiency. For example, a rotary vibration structure in which an eccentric weight is attached to a motor, a reciprocating vibration structure similar to a speaker, and the like. When attaching the electromagnetic vibrating body to a device, a method of firmly fixing the vibrating body with screws or the like or sandwiching the electromagnetic vibrating body through an elastic body is often adopted (however, the supporting rigidity is limited to the natural vibration. Make the number equal to or higher than the generated frequency). The latter method of mounting via an elastic body is frequently used because it can protect the electromagnetic vibrating body from the shock when the equipment is dropped by mistake and gives the equipment itself an impact reducing action by its cushioning action. There is a tendency. The present invention relates to an electrical connection method for a device having a structure in which an electromagnetic vibrating body is attached via an elastic body.

[0003] As a general electrical connection method in a portable device, a first example is to incorporate a button battery. In order to facilitate attachment and detachment, a structure is employed in which a leaf spring protruding from the device elastically contacts the electrode of the battery. The second example is mounting of electronic components. FIG. 8 is a side view of a conventional motor mounting structure. Solder tightly because reliability is important. In an elastically supported electromagnetic vibrating body, there are many structures in which the lead wire 54 is extended and connected by soldering as shown in FIG. In the figure, a thin cylindrical motor 51 (electromagnetic vibrator) provided with an eccentric weight 2 has its case 53 covered with a synthetic rubber boot 55,
Is sandwiched between. The electrical connections are not shown.

However, in recent years, there has been a growing demand for an electromagnetic vibrating body to be easily and preferably mounted by an automatic assembling machine, and an elastic contact type electric connection structure such as a button battery has been adopted. Japanese Patent Application Laid-Open No. Hei 8-3 is a similar example.
No. 08170. FIG. 9 is a perspective view of a conventional motor mounting structure.

In the figure, an eccentric weight 82 is attached to the rotating shaft of a thin cylindrical motor 81 to constitute an electromagnetic vibrator. The case 83 of the motor 81 is
It is fixed to the mounting plate 91 by 2. At one end of the case 83, there is an electrode (hidden and invisible in the figure) which communicates with the inside of the motor, and the power is supplied by contacting the elastic locking socket piece 93 projecting from the mounting plate 91.

In this configuration, the motor 81 is held firmly substantially like a screw. Then, a pair of elastic locking socket pieces 93 are separately provided to perform electrical connection. According to this, the motor 81 can be easily attached to the device and can be reliably connected electrically.

However, this structure is not applicable when the electromagnetic vibrator is elastically held. This is because if the elastic connection is maintained, the electric connection portion slides due to the vibration and a contact failure occurs, as described in the publication. As described above, if the electromagnetic vibrator is held firmly, it is possible to make electrical connection by elastic contact and maintain the connection reliability, but if it is elastically held, the reliability of the elastic contact portion cannot be maintained. That is, they were in a trade-off relationship. Further, as will be described in detail in Examples, elastically supporting the electromagnetic vibrator requires the elastic contact portion to have a performance capable of coping with large displacement due to impact. However, there has been no technique that can meet this demand in the technical field of the present invention, which is composed of minute components.

[0008]

SUMMARY OF THE INVENTION The present invention has a structure in which an electromagnetic vibrating body is elastically held and its electric connection is performed by crimping. While maintaining the advantages of easy electrical connection just by assembling, protecting the electromagnetic vibrating body from drop impact, and providing shock mitigation to the equipment, the problem is poor contact due to vibration of the electrical connection part And to solve the problem of poor contact due to impact.

Accordingly, an object of the present invention is to provide an electromagnetic vibrator having high electrical connection reliability and to contribute to realization of a battery-driven device which is easy to assemble and has excellent reliability.

[0010]

In order to achieve the above object, an electromagnetic vibrator according to the present invention comprises a leaf spring-like power supply terminal which is derived from a vibration generating mechanism and is electrically connected to a power supply land of an apparatus. And an elastic body provided on the back side, and when the vibration generating mechanism is incorporated in the device, the power supply terminal is:
The power supply land is pressed by a combined force of the pressing force of the elastic body and the elastic force of the power supply terminal.

[0011]

DETAILED DESCRIPTION OF THE INVENTION An electromagnetic vibrating body according to a first aspect of the present invention includes a vibration generating mechanism, a leaf spring-shaped power supply terminal which is derived from the vibration generating mechanism and is electrically connected to a power supply land of an apparatus. An elastic body provided on the back side of the terminal, the power supply terminal when the vibration generating mechanism is incorporated in the device,
The power supply land is pressed by a combined force of the pressing force of the elastic body and the elastic force of the power supply terminal.

[0012] The electromagnetic vibrator according to claim 2 of the present invention comprises:
2. The power supply terminal according to claim 1, wherein the power supply terminal has a spring strength of 10 g.
f or more, and is set such that the combined pressing force of the elastic force and the pressing force by the elastic body does not exceed 500 gf.

According to a third aspect of the present invention, there is provided a battery-driven device comprising the electromagnetic vibrator according to the first or second aspect.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is a structural view showing a state in which a thin cylindrical motor with an eccentric weight is mounted in an electromagnetic drive in an apparatus according to an embodiment of the present invention. FIG. 1A is a diagram viewed from the axial direction, and FIG. 1B is a diagram viewed from the side.

In FIG. 1, an eccentric weight 2 is attached to a shaft of a thin cylindrical motor 1 (hereinafter referred to as a motor). A drive mechanism for rotating the shaft is accommodated in the case 3.
The rotation generating mechanism and the eccentric weight constitute a vibration generating mechanism. A leaf spring-like power supply terminal 4 is provided from one end of the case 3.
Is protruding. The case 3 has a boot 5 made of synthetic rubber.
(Elastic body). The boot 5 is substantially cup-shaped, and a part 5a thereof is cut open so that the case 3 can be easily accommodated.

On the side of the device, a mounting plate 11 and a housing 12 are provided.
The motor 1 is sandwiched between the two. A power supply land 13 is provided on the mounting plate 11 at a position corresponding to the power supply terminal 4 so that power can be supplied to the motor 1.

With this configuration, the motor 1 is mounted on the mounting plate 11.
And the housing 12 is mounted and fixed, the motor 1 is crimped to the mounting plate 11, and the power supply terminal 4 elastically contacts the power supply land 13 to supply power. In the drawing, the mounting plate 11 is expressed so as to come close to the motor 1 and make contact. In actual equipment, there is a positioning member in the front-rear and left-right directions so that the power supply terminal 4 of the motor 1 contacts the power supply land 13 correctly. However, since it is not the subject of the present invention, it is omitted to avoid complication. In this way, a device having a structure that elastically holds a motor and makes an electrical connection elastically,
Assembly can be completed very easily.

The structure of the electrical connection, which is the main part of the present invention, will be described. As shown in the figure, a leaf spring-shaped power supply terminal 4 protrudes from one end of the case 3, and a substantially triangular elastic pressing body 6 is formed on a part of the boot 5 behind the power supply terminal 4. Then, when the motor 1 is incorporated in the device, the power supply terminal 4 elastically contacts the power supply land 13. Further, with the pressing of the case 3, the substantially triangular elastic pressing body 6 of the boot 5 presses from behind the power supply terminal 4.

The pressing force generated at the power supply terminal 4 at this time will be described with reference to a graph. FIG. 2 shows the pressing force of the motor having the structure shown in FIG. 1 when the power supply terminal 4 alone has no elastic pressing body 6 behind the power supply terminal 4, and FIG. . In each case, the horizontal axis represents the pressing force (unit: gf), and the vertical axis represents the terminal displacement (unit: mm). The terminal displacement refers to a displacement of the power supply terminal in a direction away from the motor, based on a state in which the device is incorporated. The terminal displacement at zero pressing force is the free height of the power supply terminal 4.

FIG. 2 is a diagram for explaining the relationship between the terminal displacement and the pressing force of the power supply terminal. As shown in FIG. 2, data was collected using samples having various free heights in consideration of manufacturing tolerances. As described above, in the case where the elastic pressing member 6 is not provided, the linear displacement has almost the same elastic coefficient. An average pressing force of about 45 gf is obtained, and if there is no vibration or impact, electrical connection can be made without any problem. However, it has been found that when the pressing force falls below 10 gf, relative motion occurs in the electrical contact portion between the power supply terminal 4 and the power supply land 13 due to vibration, and a high molecular weight polymer is generated, thereby impeding the electrical connection. Even when the pressing force was large, it was found that the leaf spring portion 4a still had a slight vibration, which also became a cause of generation of a high molecular polymer in a long term. Also, since the motor 1 is elastically supported,
When a drop impact force is applied to the device, the terminal is displaced on the minus side in the figure, and the plate spring portion 4a of the power supply terminal 4 may exceed the elastic limit and may be plastically deformed to lower the pressing force.

FIG. 3 is a diagram for explaining the relationship between the terminal displacement and the pressing force of the power supply terminal. FIG. 3 shows data when the elastic pressing member 6 made of synthetic rubber is arranged behind the power supply terminal 4. Again, data was collected using samples of various free heights. The elastic modulus is similar to that of FIG. 2 in the portion where the terminal displacement is large, but the elastic coefficient is large in the portion where the terminal displacement is small, that is, the portion close to the final mounting state, and a high pressing force of about 75 gf is obtained on average. . That is, the elastic pressing body 6 has a function of increasing the pressing force by about 30 gf. In addition, by increasing the elastic coefficient in a portion close to the final mounting state, an effect of preventing plastic deformation of the plate spring portion 4a of the power supply terminal when a drop impact force is applied to the device is exerted.

FIG. 4 is an explanatory view showing the state of micro vibration of the power supply terminal. The horizontal axis represents the elapsed time, and the vertical axis represents the displacement amplitude of the leaf spring portion 4a of the power supply terminal in the mounting plate direction.
A small hole was drilled in the mounting plate 11 and measured using a laser displacement meter. In the figure, (a) the case where there is no elastic pressing body and (b) the case where there is an elastic pressing body behind the power supply terminal are recorded side by side.
Thus, the vibration amplitude of the power supply terminal could be reduced to about 1/5 by the elastic pressing member.

As described above, the present embodiment is configured such that the elastic pressing body 6 of the boot 5 presses the power supply terminal 4 against the power supply land 13 by pressing the case 3 when assembled into the device. Thereby, first, by setting the elastic coefficient of the elastic pressing member 6, the power supply terminal 4 and the power supply land 13 are set.
Contact pressure with a high degree of freedom. Therefore, an appropriate contact pressure can be obtained while responding to various conditions,
High connection reliability can be demonstrated in various applications. The main pressing force can be assigned to the elastic pressing body 6.
If it is attempted to increase the contact pressure only with the power supply terminal 4, the influence from the support structure of the power supply terminal 4 to the arrangement of the peripheral members is affected, and it is difficult to achieve both a large terminal displacement and a large pressing force.

Secondly, when the elastic pressing body 6 is formed and the power supply terminal 4 is pressed, the double-supported beam vibration of the leaf spring portion 4a of the power supply terminal can be damped. As described above, this vibration also contributed to a decrease in reliability. Elastic pressing body 6
Is made of a material having good damping properties such as synthetic rubber, a specific example can be effectively reduced as described with reference to FIG. In this way, even if the electromagnetic vibrator vibrates, the sliding of the electrical connection portion can be reduced or prevented, and high contact reliability can be obtained in a vibration environment.

In this embodiment, the elastic force of the power supply terminal 4 and the pressing force of the elastic pressing body 6 are combined. Thus, first, the contact pressure can be set with the combined characteristic of two different types of elastic force. If the elastic force of the metal leaf spring and the pressing force of the synthetic rubber are combined, it is possible to utilize the constant characteristics of the metal material that do not change over time and the vibration damping characteristics of the synthetic rubber. Therefore, high connection reliability can be obtained under various environmental conditions.

Second, the displacement characteristics can be made non-linear.
This characteristic has been described with reference to FIG. As shown in the figure, even if the motor 1 moves away from the mounting plate 11 due to external acceleration and the terminal displacement becomes large, the leaf spring portion 4a of the power supply terminal follows with sufficient margin, and moves in the opposite direction to reduce the terminal displacement. Alternatively, when the value becomes negative, the rigidity is increased to prevent plastic deformation. By such an operation, high connection reliability can be obtained in an impact environment.

Further, in this embodiment, an elastic pressing member 6 is provided integrally with the boot 5 covering the case 3. Since it can be constituted only by adding a function to a part of the boot 5 which elastically supports the motor 1, no cost is required for improving the performance of the electric connection portion. As a result, high connection reliability can be obtained without an increase in cost.

In this embodiment, as shown in FIG. 1, a triangular projection is provided at a portion of the elastic pressing member 6 which comes into contact with the power supply terminal 4. With such a shape, the contact pressure characteristics between the power supply terminal 4 and the power supply land 13 can be set with a high degree of freedom. Thereby, an appropriate contact pressure can be obtained while responding to various conditions. Therefore, high connection reliability can be obtained in various applications. In the design of FIG. 1, the pressing force is increased by an average of 30 gf, and the elastic coefficient is set so that the pressing force does not exceed 500 gf under any conditions specified in the specifications.

In this embodiment, a synthetic rubber is used for the elastic pressing member 6 to be brought into contact with the power supply terminal 4. This allows
A terminal pressing structure having insulation and vibration damping properties can be obtained.
Although the effect of vibration damping can be said to be indispensable as described above, if the elastic pressing member 6 is made of synthetic rubber, it is not necessary to separately add an insulating function and a braking function to the terminal portion. Therefore, high connection reliability can be obtained without an increase in cost.

The elastic pressing member 6 is most preferably made of synthetic rubber industrially, but may be made of natural rubber, metal or organic cotton or felt. It is also possible to form the elastic pressing structure with a synthetic resin represented by polyacetal. In the embodiment, the power supply terminal 4 is arranged in a region where the case 3 is projected in the pressing direction, but the power supply terminal may be arranged outside the region if necessary.

(Embodiment 2) Another embodiment of the present invention will be described with reference to FIG. FIG. 5 (a) is a diagram viewed from the axial direction, and FIG. 5 (b) is a diagram viewed from the side. Although the general structure is the same as that of the first embodiment, the boot 5 and the elastic pressing body 6 are integrally formed in the first embodiment (FIG. 1).
In the second embodiment (FIG. 5), the boot 25 and the elastic pressing body 2
6 is different from that of FIG.

With this, it is possible to set the material and structure that are optimal for the functions to be performed respectively, so that it is possible to obtain appropriate contact pressure characteristics, vibration damping characteristics, and environmental resistance while responding to various conditions. High connection reliability can be demonstrated.

In this embodiment, the case 3 has been described in which the boot 3 is elastically supported on the case 3 in advance, but an elastic support structure may be provided on the side of the device. Similarly,
Power supply land 1 on device side without elastic pressing body 6 on motor side
3 may be elastically displaced, and an elastic pressing body may be disposed behind the elastic pressing member.

Embodiment 3 Next, details of the shape of the elastic pressing body will be described with reference to FIG. FIG. 6 shows four types of shapes. (A) triangular projection, (b) hollow projection,
(C) The trapezoidal projection and (d) the double bump are tentatively called.

(A) The triangular projection is the one described in the first embodiment. As shown in FIG. 1, the vibration of the leaf spring 4a is controlled by pressing the rear of the electric connection portion of the power supply terminal 4 and making the inclination of the leaf spring 4a side contact gently. The inclination angle is determined so as to obtain the pressing force characteristic described above. (B) The hollow projection is suitable for obtaining a smaller elastic modulus. (C) The trapezoidal projection is suitable for obtaining a higher elastic modulus.
(D) The double bump is suitable when it is desired to more positively obtain the damping action of the leaf spring.

As described above, by providing at least one projection on the elastic pressing portion, the contact pressure characteristic between the power supply terminal and the power supply land can be set with a high degree of freedom, so that an appropriate contact pressure can be set while meeting various conditions. And high connection reliability can be demonstrated in various situations.

(Embodiment 4) Still another embodiment will be described with reference to FIG. In the figure, what is covered by an elastic body 35 is a flat disk-shaped electromagnetic vibrating body 31. The electromagnetic vibrator 31 is one in which a reciprocating oscillator is accommodated in a case 33 or one in which a flat motor is attached with an eccentric weight. As in the example already described, an elastic pressing body is provided behind the power supply terminal 34. Thus, the present invention can be applied to various types of electromagnetic vibrators.

Although various embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various applications and developments are possible within the scope of the present invention.

[0039]

As is apparent from the above description, according to the present invention, there is provided a structure in which the vibration generating mechanism is elastically held and the electrical connection thereof is performed by press-contact between the leaf spring-like power supply terminal and the power supply land. The problem of poor contact due to vibration of the electrical connection and poor contact due to shock can be solved by providing an elastic body on the back side of the power supply terminal. Accordingly, an electromagnetic vibrator having high electrical connection reliability is provided, which contributes to realization of a battery-driven device which is easy to assemble and has excellent reliability.

[Brief description of the drawings]

FIG. 1A is a view of a motor mounting structure according to an embodiment of the present invention viewed from an axial direction. FIG. 1B is a view of a motor mounting structure of an embodiment of the present invention viewed from a side.

FIG. 2 is an explanatory diagram showing a relation between terminal displacement and pressing force of a power supply terminal (when a power supply terminal is used alone).

FIG. 3 is an explanatory view showing a relation between terminal displacement and power supply terminal pressing force (when an elastic pressing body is present).

FIG. 4 is an explanatory view of observation of displacement amplitude of micro vibration of a power supply terminal.

FIG. 5A is a view of a motor mounting structure according to another embodiment of the present invention viewed from an axial direction. FIG. 5B is a view of a motor mounting structure of another embodiment of the present invention viewed from a side.

6A is a diagram illustrating the shape of a triangular protrusion of the elastic pressing member. FIG. 6B is a diagram illustrating the shape of a hollow protrusion of the elastic pressing member. FIG. 6C is a diagram illustrating the shape of a trapezoidal protrusion of the elastic pressing member. Figure (d) Diagram showing the shape of the bilobal projection of the elastic pressing body

FIG. 7 is a side view of a motor mounting structure according to still another embodiment.

FIG. 8 is a side view of a conventional motor mounting structure.

FIG. 9 is a perspective view of another conventional motor mounting structure.

[Explanation of symbols]

 1, 51, 81 Thin cylindrical motor (part of electromagnetic vibrator) 2, 82 Eccentric weight 3, 33, 53, 83 Case 4, 34 Power supply terminal 4a Leaf spring 5, 25, 35, 55 Boot (elastic body) 5a, 25a Opening section of boot 6, 26, 36 Elastic pressing body 11, 61 Mounting plate 12, 62 Housing 13 Power supply land 31 Electromagnetic vibrator 54 Lead wire 92 Elastic locking piece 93 Elastic locking socket piece

Claims (3)

[Claims] A vibration generating mechanism includes: a vibration generating mechanism; a leaf spring-shaped power supply terminal which is derived from the vibration generation mechanism and is electrically connected to a power supply land of an apparatus; and an elastic body provided on a back side of the power supply terminal. An electromagnetic vibrating body that, when a mechanism is incorporated in a device, presses the power supply terminal against the power supply land by a combined force of a pressing force of the elastic body and an elastic force of the power supply terminal. 2. The power supply terminal according to claim 1, wherein the power supply terminal has a spring strength of at least 10 gf, and a combined pressing force of the elastic force and the pressing force by the elastic body does not exceed 500 gf. Electromagnetic vibrator. 3. A battery-driven device comprising the electromagnetic vibrator according to claim 1.