KR100748592B1 - Subminiature linear vibrator - Google Patents

Abstract

A subminiature linear vibrator is provided to permit to eliminate necessity of a circuit for driving a vibrator by using a resonant frequency generator. A subminiature linear vibrator(2) includes a stator(100) and a mover(200). The stator is formed by mounting a printed circuit board(10) equipped with an annular field coil(12), a capacitor(14), and a frequency generation control chip(16) onto a lower case(6) of a main body. The mover is formed by mounting an annular weight(22) and an annular permanent magnet(24) beneath a bracket(20) having an air flow hole(21), and connecting an elastic spring(26) to a bottom surface of an upper case(4) and a peripheral portion(20a) of the air flow hole of the bracket. The vertically magnetized annular permanent magnet is arranged in the vicinity of the annular field coil.

Description

Miniature Linear Vibrator {SUBMINIATURE LINEAR VIBRATOR}

1 is an exploded perspective view of a micro linear vibration device according to an embodiment of the present invention;

Figure 2 is a side cross-sectional view of a micro linear vibration device according to an embodiment of the present invention,

3 is a plan sectional view of FIG. 2;

Figure 4 is a circuit diagram of a micro linear vibration device according to an embodiment of the present invention,

5 is a view for explaining the vibration principle of the linear vibration device according to an embodiment of the present invention,

6 is an enlarged perspective view of the elastic spring of FIG. 1;

7 is a waveform diagram of a resonant frequency signal.

<Description of the symbols for the main parts of the drawings>

2-- compact linear vibrator 4-- top case

6-- lower case 10-- printed circuit board

12-Ring coil 14-Capacitor

16-Frequency control chip 20-Bracket

20a-Peripheral 21-Airflow

22-- annular weight 24-- annular permanent magnet

26-- Elastic spring 100-- Fixture

200-- mobile

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrator, and to a vibrator that is extremely small and linearly vibrated.

These days, as the size of the terminals is becoming smaller and smaller, various components employed in the terminals are also becoming smaller and thinner. Among various components requiring miniaturization and thinning, there are vibration devices for mobile phone vibration alarms, etc. These vibration devices are often implemented by miniaturizing the vibration motor.

As an example of miniaturizing the vibration motor, there is a "flat non-commutator vibration motor" (Patent Application No. 10-2002-38046), which was patented in the Republic of Korea by the inventor of the present invention on July 2, 2002. The flat non-commutator vibrating motor of the example is a flat type (motor) type vibration motor with a significant reduction in thickness, weight and size, but without a brush and commutator (brushless type) vibration motor. An eccentric means (weight) is installed on one side of the outer surface of the permanent magnet, which is a rotor, and a pair of hall sensors for detecting the magnetic pole or magnetic pole position of the permanent magnet are installed to operate and operate the vibration motor. The motor controller is installed in the internal space of the vibration motor, and has a structure in which the arrangement structure of the stator coil is improved to reduce the magnetic flux loss and to eliminate the starting point.

The flat vibration motor of the above example is a very small sized vibration device having a thickness of less than 15 mm and a diameter of less than 2 mm to 3 mm, and this ultra-small vibration device is not the same as the motor method described above. If it can also be implemented as a small vibrator can be implemented in a variety of ways.

Accordingly, it is an object of the present invention to provide an ultra-small and linearly vibrable micro vibrator.

Another object of the present invention is to provide a micro linear vibration device having a coil resonance frequency generator.

In accordance with the above object, the present invention, in the linear vibration device, the annular field coil 12, the capacitor 14 and the frequency generation control on the lower case 6 of the main body of the upper and lower case (4) (6) The fixed circuit 100 is mounted by mounting the printed circuit board 10 having the chip 16 mounted thereon, and the annular weight 22 and the annular permanent magnet 24 are formed at the bottom of the bracket 20 having the air flow hole 21. ) And the elastic spring 26 is attached to the bottom surface of the upper case 4 and the air flow hole periphery 20a of the bracket 20 to configure the movable body 200, but the vertically magnetized annular permanent magnet 24 ) Is arranged to be adjacent to the annular field coil (12).

In the 'mini linear vibrator' referred to herein, the 'linear vibrator' is a device having a mechanism that causes the movable body to vibrate while moving linearly, unlike a motor vibrator that causes vibration by the rotation of the rotating body. Meaning, 'miniature' means that the main body thickness of the linear vibrating device is in the range of about 2 to 5mm and its diameter is in the range of about 7 to 15mm.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Ultra-small linear vibrator according to an embodiment of the present invention, unlike the motor-type vibration device that causes the vibration by the rotation of the rotating body, the movable body moves up and down linearly so that the bodily vibration is built in the terminal relative to the motor-type vibration device Has great characteristics.

In addition, the linear vibration device according to an embodiment of the present invention is implemented to be embedded in the coil resonant frequency generator in the body implemented in a very small. Furthermore, although the resonance frequency to be generated in the coil resonant frequency generator built in the main body depends on a plurality of parameters implemented for vibration in the linear vibrator, in the exemplary embodiment of the present invention, the coil resonant frequency generator includes a frequency generation control chip ( IC is separated into a capacitor and a capacitor, and the capacitance value is adjusted by using the capacitor to realize the required resonance frequency.

1 is an exploded perspective view of a micro linear vibration device 2 according to an embodiment of the present invention, Figure 2 is a side cross-sectional view of a micro linear vibration device 2 according to an embodiment of the present invention, Figure 3 is Plane section view. 4 is a circuit configuration diagram of the micro linear vibration device 2 according to the embodiment of the present invention.

The ultra-linear linear vibrator 2 according to the embodiment of the present invention constitutes a main body by fastening the upper case 4 and the lower case 6. The main body is manufactured in a microminiature having a thickness of about 2 to 5 mm and a diameter of about 7 to 15 mm.

On the lower case 6, the fixed circuit 100 is formed by mounting the printed circuit board 10 on which the annular field coil 12, the capacitor 14, and the frequency generation control chip 16 are mounted.

The annular field coil 12 has a predetermined diameter and is preferably disposed concentrically on the printed circuit board 10, and the capacitor 14 and the frequency generation are formed on the printed circuit board 10 inside the annular field coil 12. The control chip 16 is arranged. The capacitor 14 and the frequency generation control chip 16 constitute a coil resonance frequency generator (40 in FIG. 4) for generating the resonance frequency of the annular field coil 12, and use the capacitance values using the capacitors 14. When adjusted, the frequency generation control chip 16 can arbitrarily generate the resonance frequency required by the designer. The capacitor 14 is preferably composed of a microlayer multilayer capacitor (MLCC), which is a very small size, and the coil resonance frequency generator 40 will be described later in detail with reference to FIG. 4. .

On the other hand, the upper case 4 constitutes a movable body 200 which has a linear movement by acting with the fixture 100 of the lower case 2. That is, the annular weight 22 and the annular permanent magnet 24 are mounted on the bottom of the bracket 20 having the air flow hole 21, and the elastic spring 26 is attached to the bottom of the upper case 4 and the bracket 20. The movable body 200 is constituted by binding to the air flow hole periphery 20a.

The annular weight 22 mounted on the bottom of the bracket 20 serves as a weight of the movable body 200 and is configured to be mounted on the outermost circumference of the bottom of the bracket 20, and the adjacent inner circumference of the annular weight 22. The annular permanent magnet 24 having two poles vertically magnetized in the vertical direction is mounted on the bottom surface of the bracket 20.

The air flow hole 21 of the bracket 20 allows the air flow generated as the movable body 200 reciprocates linearly in the vertical direction to flow smoothly. The air flow hole peripheral portion 20a of the bracket 20 has a bent concave shape structure. The lower ring piece 26a of the elastic spring 26 as shown in FIG. 6 is welded to the periphery of the bent air flow hole 20a of the bracket 20 by spot welding, and the upper side of the elastic spring 26 is welded. (26b) is also welded to the bottom of the upper case 4 by spot welding.

In Fig. 6, reference numeral 26c, which has not been described, is a connection part of the elastic spring 26.

As shown in FIG. 6, the upper piece 26b of the elastic spring 26 is configured to have a smaller diameter than the lower ring piece 26a of the elastic spring 26. The structure of the elastic spring 26 is an operator. The lower ring piece 26a of the elastic spring 26 is first fixed to the upper surface of the air flow hole periphery 20a of the bracket 20 by spot welding, and then the welder is inserted through the air flow hole 21 of the bracket 20. The upper piece 26b of the elastic spring 26 allows spot welding to the bottom surface of the upper case 4 easily.

In the embodiment of the present invention, the annular field magnet 12 of the stationary body 100 and the annular permanent magnet 24 of the movable body 200 are arranged in a structure of the annular permanent magnet 24 of the vertically polarized magnetized magnet. The magnetic pole boundary portion PB of the annular permanent magnet 24 is formed to be lower than the uppermost end of the annular field coil 12.

Referring to this example in more detail with reference to the example shown in FIG. 2, when the annular permanent magnet 24 is vertically magnetized to the lower S, N, the SN stimulus boundary part PB of the annular permanent magnet 24 is the annular field coil 12. It is formed so as to be adjacent to the upper N-pole region of the lower N, S-pole (system magnetic pole) to be formed. That is, in the embodiment of the present invention, the annular permanent magnet 24 is configured to be vertical two-pole magnetized, and in the annular field coil 12, the two-pole magnetic pole opposite to the magnetized polarity of the annular permanent magnet 24 is vertical. To be formed.

Due to the arrangement of the annular permanent magnet 24 and the annular magnet coil 12, the lower S pole of the annular permanent magnet 24 is subjected to the attractive force on the lower N pole (field magnetic pole) of the annular magnetic coil 12. The upper N-pole of the annular permanent magnet 24 is subjected to the attraction action to the upper S-pole (field stimulus) of the annular field coil 12 so that the movable body 200 is lowered downward.

In the ultra-small linear vibrator 2 of the present invention, the lower case 6 is made of a magnetic material such as a steel plate to enhance the electromagnetic force of the annular field coil 12 and shield the electromagnetic force leaking to the outside. Preferably, the material of the bracket 20 is also composed of a magnetic material such as an iron plate in order to enhance the magnetic force of the annular permanent magnet 24 and to allow the magnetic leakage of the bracket 20 to be shielded. The upper case 4 may be either nonmagnetic or diamagnetic.

The micro linear vibration device 2 according to the embodiment of the present invention is the attraction between the annular field coil 12 of the stationary body 100 and the annular permanent magnet 24 of the movable body 200 and The movable body 200 is moved up and down by the elastic force 26 of the elastic spring 26, but the movable body 200 is moved up and down by using the coil resonance frequency generator 40 of FIG. The linear vibration device 2 is linearly oscillated by configuring the oscillator to be resonant oscillated.

Referring to FIG. 4, the coil resonance frequency generator 40 includes an output including a constant voltage regulator 42, an RC oscillator 44 having a capacitor 14, a duty ratio controller 46, and a driver 50. Comprising a portion 48, a driving current corresponding to the resonance frequency for causing the movable body 200 to oscillate oscillation is applied to the annular field coil (12).

In the coil resonant frequency generator 40, the constant voltage regulator 42, the resistor element of the RC oscillator 44, the duty ratio controller 46, and the driver 50 are the frequency generation control chips shown in FIGS. 1 to 3. It is implemented in IC form as shown in (16).

However, the capacitor element of the RC oscillator 44 in the coil resonant frequency generator 40 is implemented as at least one or more capacitors 14, as shown in FIGS. 1 to 3, but separately from the frequency generation control chip 16. Configuration is configured.

In the arrangement of the capacitor 14, the magnetic field strength and the fixed body of the annular permanent magnet 24 whose resonance frequency, which should be generated by the coil resonance frequency generator 40, constitute the movable body 200. Parameters such as the strength of the electromagnetic force generated by the driving current flowing through the annular field coil 12 constituting the (100), the weight of the annular weight 22, and the elastic modulus of the elastic spring 26 are taken into consideration. Because it is done. Therefore, when the parameters are determined, the value of the resonant frequency in the coil resonant frequency generating unit 40 is obtained. Thus, the designer may designate one or more capacitors 14 having a capacitance value to obtain the obtained resonant frequency. You just need to install on.

If all the capacitor components of the RC oscillator 44 are embedded in the same IC as the frequency generation control chip 16, the capacitance value is fixed and thus cannot be matched to the resonance frequency required for the linear vibration device.

Referring to Figure 4 will be described in more detail the operation of generating the resonant frequency in the coil resonant frequency generator 40 and outputs the drive current corresponding thereto.

When the constant voltage generated by the constant voltage regulator 42 of the coil resonance frequency generator 40 is applied to the RC oscillator 44, the RC oscillator 44 generates a constant oscillation frequency at all times without changing the oscillation frequency. The RC oscillator 44 performs oscillation by the RC time constant, wherein the capacitor component in the RC time constant is formed by one or more capacitors 14, that is, one or more multilayer thin film capacitors (MLCC).

The oscillation signal oscillated by the RC oscillator 44 is adjusted to the frequency for coil resonance by adjusting the capacitor value of the designer using the capacitor 14, and is applied to the duty ratio controller 46. The duty ratio adjusting unit 46 adjusts the pulse duty ratio of the oscillation frequency to 50:50 and applies it to the driving unit 50 of the output unit 48 as a resonance frequency signal RFS as shown in FIG. 7. . The driving unit 50 of the output unit 48 applies a driving pulse binary logic state corresponding to the resonance frequency signal RFS to the driving switching unit 52 such as a transistor. Accordingly, the driving switching unit 52 is turned on in response to the binary logic 'high' state (or binary logic 'low' state) of the corresponding driving pulse in response to the resonance frequency signal, so that the driving current flows in the annular field coil 12. .

As an embodiment of the present invention, when the annular permanent magnet 24 of the movable body 200 as shown in Figure 2 magnetized in the lower S, N as shown in Figure 2 the annular field coil 12 of the fixed body 100 The driving current flows to the upper part of the annular field coil 12 so as to form a field pole of the north pole and the south pole of the south pole.

Therefore, in the initial state in which the drive current does not flow in the annular field coil 12, the movable body 200 maintains the initial position as shown in FIG. 5 (a), and when the drive current flows, it is shown in the annular field coil 12. As described above, field poles of the upper N pole and the lower S pole are formed. As a result, the movable body 200 descends downward as shown in FIG. 5 (b), and the driving current does not flow to the annular field coil 12 when descending to the lowermost position.

In this state, as shown in (b) of FIG. 5, the elastic springs 26 bound to the bottom of the upper case 4 are extended to have the maximum elastic restoring force. Therefore, the movable body 200 by the elastic restoring force of the elastic spring 26, as shown in (c) of FIG. 5, is moved up from the bottom to the top.

After that, the movable body 200 is returned to the initial position as shown in FIG. 5A again by the compressive force of the elastic spring 26. When the movable body 200 returns to the initial position, the stationary body 100 is returned. As the driving current flows again to the annular field coil 12, the process of FIG. 5 (a) (b) (c) can be repeated.

As described above, as the oscillation oscillation operation is performed by the action between the stationary body 100 and the movable body 200, the linear vibrator 2 of the present invention vibrates linearly.

In the above description of the present invention, specific embodiments have been described, but various modifications may be made without departing from the scope of the present invention. Therefore, the scope of the present invention should not be defined by the described embodiments, but should be determined by the equivalent of claims and claims.

As described above, the present invention can implement a vibrating device that is extremely small and linearly vibrating, and furthermore, the built-in resonant frequency generator inside the micro vibrating device does not have to have a separate circuit part outside the main body for driving. have.

Claims (10)

In the linear vibrator, The printed circuit board 10 mounted with the annular field coil 12, the capacitor 14, and the frequency generating control chip 16 is mounted on the lower case 6 of the main body of the upper and lower cases 4 and 6. The fixed body 100 is mounted, and the annular weight 22 and the annular permanent magnet 24 are mounted on the bottom of the bracket 20 having the air flow hole 21, and the elastic spring 26 is attached to the upper case 4. The movable body 200 is formed by binding to the bottom surface and the air flow hole periphery 20a of the bracket 20, and the vertically magnetized annular permanent magnet 24 is disposed adjacent to the annular field coil 12. Miniature linear vibrator made with. The ultra-small linear vibration device according to claim 1, wherein the capacitor (14) and the frequency generation control chip (16) constitute a coil resonance frequency generator (40) for generating a coil resonance frequency. The micro linear vibration device according to claim 1 or 2, wherein the capacitor (14) is composed of one or more multilayer thin film capacitors (MLCC) and forms a capacitance component of the RC oscillation unit (44). The micro linear vibration device according to claim 1 or 2, wherein the magnetic pole boundary PB of the annular permanent magnet (24) is formed lower than the uppermost end of the annular field coil (12). The method of claim 2, wherein the coil resonance frequency generator 40, A constant voltage regulator 42 for generating a constant voltage, An RC oscillator 44 including the capacitor 14 and outputting an oscillation signal based on an RC time constant under the constant voltage supply; A duty ratio controller 46 for adjusting the duty ratio of the outgoing signal and outputting it as a resonance frequency signal; And an output unit (48) for applying a driving current based on the resonance frequency signal to the annular field coil (12). The coil resonance frequency of the coil resonance frequency generator 40 is characterized in that the magnetic strength of the annular permanent magnet 24, the strength of the electromagnetic force generated by the driving current flowing through the annular field coil 12, and the annular Miniature linear vibration device, characterized in that obtained by considering the parameters including the weight of the weight (22), the elastic modulus of the elastic spring (26). The micro linear vibration device according to claim 1 or 2, wherein the lower case (6) and the bracket (20) are made of a magnetic material. The micro linear vibration device according to claim 1 or 2, wherein the air flow hole peripheral portion (20a) of the bracket (20) is configured to have a bent indentation shape. According to claim 8, The elastic spring 26 is composed of a lower ring piece (26a), the upper piece (26b), the connection connecting piece (26c), of the upper piece (26b) welded to the bottom surface of the upper case (4) Ultra-compact linear vibration device, characterized in that the diameter is configured to be narrower than the diameter of the lower ring piece (26a) to be welded on the air flow hole peripheral portion (20a). 5. The annular permanent magnet (24) is configured to vertically pole-pole magnetized, and in the annular field coil (12), two-pole magnetic poles opposite to the magnetized polarity of the annular permanent magnet (24) are vertical. Miniature linear vibration device, characterized in that configured to form.

Images