JP2003145046A - Portable device and its vibration generator system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent transmission of vibration of a vibration generator body to its power feeding board. SOLUTION: A weight unbalanced member 9 is attached to the rotary shaft 8 of the main body 7 of a motor to construct the vibration generator body 10. A connection terminal 11 which is led from the main body 7 of the motor and connected to the power feed part 4 of a printed board 2 is formed from a leaf spring, and set so as not to resonate with the vibration generated by the vibration generator body 10. Accordingly, connection with the feed part 4 of the printed board 2 is held reliably.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a pager or a portable device such as a wrist watch having a vibration time notification means, and a vibration generator mounted therein.

[0002]

2. Description of the Related Art Conventionally, for example, in a mobile phone,
It is becoming common to add a vibration generator with an eccentric weight attached to the rotary shaft of a small motor, and to notify the incoming call silently by vibration when necessary.

The above-mentioned vibration generator is connected to a power feeding portion of a substrate in a mobile phone through an electric connecting means.
Specifically, those using a lead wire were initially implemented.

However, there is a problem in assembly work in the case of using the above-mentioned lead wire because soldering or the like is required. Therefore, recently, the mainstream method is to attach a leaf spring, a coil spring, or an elastic connection terminal such as conductive rubber to a small motor that constitutes a vibration generator, and directly connect it to the power supply part of the board when incorporating it in a mobile phone. Has become.

If the connection terminal is made of an elastic material, a reliable connection state can be obtained even if there are some errors in the assembly size and the like, and the elasticity makes it difficult to transmit the vibration of the vibration generator to the substrate. You can also expect to do it.

As is well known, various electronic components are mounted on a substrate, for example, a printed substrate, and it can be understood that it is important to suppress vibration transmission because these are weak against vibration.

[0007]

However, when the connecting terminal is simply made of an elastic material, resonance may occur due to the relationship with the natural frequency of the vibration system rather than the problem of vibration damping.

As a result, when the vibration generator is activated, the energization becomes unreliable due to the resonance of the connection terminal, which may adversely affect the notification itself. In addition, the contact / separation of the contact part generates an arc, and the electrical connection is made. However, there was a problem that caused problems.

The present invention has solved the above-mentioned conventional drawbacks, and an object of the present invention is to ensure the connection between the vibration generator and a power supply unit such as a mobile phone and to keep the original function of the device good. And

[0010]

SUMMARY OF THE INVENTION To solve this problem, the present invention provides a portable device having a vibration generator therein,
The vibration generator is electrically connected to the power feeding portion of the substrate via the connection terminal made of an elastic material, and the connection terminal is set so as not to resonate due to the vibration generated by the vibration generator. As a result, the connection between the vibration generator and the power supply unit such as a mobile phone becomes reliable.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention relates to a portable device in which a vibration generator is installed, wherein the vibration generator is electrically connected to a power feeding portion of a substrate via a connection terminal made of an elastic material,
Moreover, the connection terminal is set so as not to resonate due to the vibration generated by the vibration generator.

When the frequency of the vibration generator is fm, the natural frequency fo of the system formed by the vibration generator and the connection terminal is fo.
Was set to be smaller than fm / √2.

It is also conceivable that the connection terminal is made of conductive rubber in addition to the leaf spring and the coil spring.

Further, as the vibration generator, a vibration generator constituted by providing a weight unbalance member on the rotating portion of the motor body, and a connection terminal for supplying power to the motor, which is connected to a power supply portion of the device side board The connection terminal is formed of an elastic material that is set so as not to resonate due to the vibration generated by the vibration generator.

When the frequency of the vibration generator is fm, the natural frequency fo of the system formed by the vibration generator and the connection terminal is fo.
Was set to be smaller than fm / √2.

The connection terminal is set to be elastically deformed so as to bend at least in the direction of application of the vibration generated by the vibration generator.

According to the above, even if the connection terminal is made of an elastic material, the resonance peculiar to the elastic material is not generated, and the vibration of the vibration generator is buffered to suppress the transmission to the printed circuit board.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described below with reference to the drawings.

The figure shows a case where the invention is applied to a mobile phone, that is, in FIGS. 1 to 3, a printed circuit board 2 on which a large number of electronic parts and the like are mounted is provided in a body case 1 of the mobile phone, and a vibration generator 3 is provided. Is also installed internally in a state of being electrically connected to the power feeding portion 4 of the printed board 2.

The vibration generator 3 is attached to the inside of the rib 5 formed integrally with the body case 1 through the elastic material 6.

The vibration generator 3 includes a vibration generator 10 in which a weight unbalance member 9 is attached to a rotary shaft 8 of a so-called cylinder-shaped motor body 7 having a longitudinal dimension larger than a radial direction, and the motor body 7. It is composed of a pair of connection terminals 11 derived from the above.

In the case of the present embodiment, the weight unbalance member 9 is made of a weight made of a material having a large mass such as tungsten, and is eccentric to the rotary shaft 8 of the motor body 7.
It is fixed to. Therefore, when the motor body 7 is energized, the weight unbalance member 9 eccentrically rotates to induce vibration.

The connection terminal 11 is made of a leaf spring-like conductive material such as copper alloy, and its tip is set as a free end. When the vibration generator 10 is installed at a predetermined position in the body case 1, the connection terminal 11 is in an elastically deformed and bent state, and its free end side is in elastic contact with the power supply section 4 of the printed circuit board 2. Is.

By the way, the connection terminal 11 is used as the vibration generator 1.
It is set so as not to resonate due to the vibration generated at zero.

FIG. 4 shows a vibration transmission characteristic. When the frequency of the vibration generator 10 is fm, the vibration generator 10 is shown.
And the natural frequency fo of the system due to the connection terminal 11 is fm / √
When the value is set to be smaller than 2, the vibration conductivity becomes "1" or less and resonance is not generated.

The natural frequency fo is fo = 1 / 2π
It is expressed by a relational expression of √K / √m. Note that K = spring constant, m
= Mass of the vibration generator 9.

In order to suppress resonance, fo <
fm / √2, and if the frequency fm of the vibration generator 10 is determined, the spring constant K of the connection terminal 11 may be reduced.

Specifically, it is conceivable to reduce the thickness of the connection terminal 11 or to use a soft elastic material.

According to the configuration of the above embodiment, the vibration generator 1
The connection terminal 11 does not resonate due to the vibration generated at 0, the stable power supply state can be maintained, and the vibration notification can be ensured.

Incidentally, if the rotation speed of the motor body 7 in the vibration generator 10 is set to 9000 rpm, the vibration frequency fm becomes 150 Hz. Therefore, the vibration generator 1
The natural frequency fo of the system consisting of 0 and the connection terminal 11 is 150
If it is set to x√2 = 212 Hz or less, the connection terminal 11 will be located in the non-resonant region.

FIG. 5 shows another embodiment of the present invention in which the connecting terminal 12 is made of conductive rubber instead of the leaf spring of the above embodiment. In this case, in order to prevent the resonance of the connection terminal 12, a method such as changing the hardness of rubber can be considered.

FIG. 6 shows still another embodiment of the present invention in which the connection terminal 13 is constituted by a conductive coil spring instead of the leaf spring of the above embodiment. In this case, in order to prevent the resonance of the connection terminal 13, a method such as thinning the wire diameter of the coil spring may be considered.

[0033]

As described above, according to the present invention, the vibration generator provided in the portable device is electrically connected to the power feeding portion of the substrate through the connecting terminal made of the elastic material, and the connecting terminal generates vibration. Since it is set so as not to resonate due to the vibration generated by the body, not only the generation of an arc or the like is prevented, but also the vibration of the vibration generating body is reliably absorbed by the connection terminal.

Therefore, it is possible to keep the portable device in a good condition without adversely affecting the electronic parts and the like due to the vibration transmission to the arc and the substrate.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a mounted state of a vibration generator on a portable device according to an embodiment of the present invention.

FIG. 2 is a front view of the mobile phone.

FIG. 3 is a bottom view of the vibration generator.

[Fig. 4] Vibration transfer characteristic diagram

FIG. 5 is a cross-sectional view of essential parts showing another embodiment of the present invention.

FIG. 6 is a cross-sectional view of an essential part showing still another embodiment of the present invention.

[Explanation of symbols]

2 substrates (printed circuit board) 3 Vibration generator 4 power supply 7 Motor body 8 rotation axes 9 Weight unbalance member 10 Vibration generator 11, 12, 13 connection terminals

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 5D107 AA11 AA14 AA16 BB08 CC09                       DD09                 5H605 AA04 BB05 CC06 EA09 EA11                       EA12 EC08 FF08 GG21

Claims (9)

[Claims] 1. A portable device having a vibration generator internally provided, wherein the vibration generator is electrically connected to a power supply section of a substrate via a connection terminal made of an elastic material, and the connection terminal is connected to the vibration generation body. A mobile device that is set so that it does not resonate due to the vibration that occurs. 2. When the vibration frequency of the vibration generator is fm,
The natural frequency fo of the system consisting of the vibration generator and the connection terminal is f
The mobile device according to claim 1, wherein the mobile device is set to be smaller than m / √2. 3. The mobile device according to claim 1, wherein the connection terminal is formed of a leaf spring. 4. The mobile device according to claim 1, wherein the connection terminal is composed of a coil spring. 5. The mobile device according to claim 1, wherein the connection terminal is made of conductive rubber. 6. A vibration generator comprising a weight unbalance member provided in a rotating portion of a motor body, and a connection terminal for supplying power to the motor body, which is connected to a power supply portion of a device side board, This connection terminal is a vibration generator made of an elastic material set so as not to resonate due to the vibration generated by the vibration generator. 7. When the vibration frequency of the vibration generator is fm,
The natural frequency fo of the system consisting of the vibration generator and the connection terminal is f
The vibration generator according to claim 6, wherein the vibration generator is set to be smaller than m / √2. 8. The vibration generator according to claim 6, wherein the connection terminal is elastically deformed so as to be bent at least in a direction in which the vibration generated by the vibration generator is applied. 9. The vibration generator according to claim 6, wherein the weight attached to the rotation shaft of the motor main body in an eccentric state is a weight unbalance member.