KR100540288B1 - Dynamic micro vibrator of direct current driving - Google Patents

Abstract

The present invention relates to a dynamic micro-vibrator of the direct current drive type vibration up and down through a DC power supply without a separate drive circuit, the progressive vibration reduction phenomenon does not occur as always vibrating at the resonance point, the present invention yoke, permanent magnet, A micro vibrator comprising a plate, comprising: a leaf spring for holding and supporting the yoke; A coil positioned between the yoke and the plate and fixedly coupled; And at least two spring electrode terminals, one side of which is connected to a connection pattern of a printed circuit board, to switch the DC power supplied to the coil, and the other side of the spring electrode terminal is extended to the vertically bent portion of the leaf spring. And an insulator attached to an outer wall of the yoke from an end of the vertically bent extended portion of the leaf spring.

Micro, Vibrator, Leaf Spring, Spring, Switching, DC Power, Dynamic

Description

Dynamic micro vibrator of direct current drive             

1 is a cross-sectional view of a conventional AC drive vibration, acoustic composite mode micro speaker.

Figure 2a is a cross-sectional view of a direct-current drive magnetic dynamic micro vibrator according to the present invention.

Figure 2b is a cross-sectional view of the direct-acting external magnetic dynamic micro vibrator according to the present invention.

3 is a plan view of a leaf spring according to the present invention.

Figure 4a is a front and rear electrode pattern of the PCB electrode terminal according to the present invention and the configuration of the energization position of both sides.

Figure 4b and Figure 4c is a plan view and a bottom view for explaining the coupling state of the PCB electrode terminal, the fixed coil and the spring electrode terminal according to the present invention.

5A to 5C are cross-sectional views for explaining the driving principle of a DC driving dynamic micro vibrator according to the present invention.

* Explanation of symbols for the main parts of the drawings

3: Lower cover 4: PCB electrode terminal

7: plate 8: permanent magnet

9: yoke 14: housing

15: housing guide 16: leaf spring

17: magnetic circuit guide 18: insulation pad

19: spring electrode terminal 20: fixed coil

The present invention relates to a micro vibrator used for the purpose of vibration reproduction for transmission transmission of a micro portable electronic device, and more particularly, a magnetic circuit mass body composed of permanent magnets is used to recover the repulsive force of the magnetic field generated from the fixed coil and the restoring force of the leaf spring. It can be driven up and down through the switch, and enables the automatic switching action of the conductive plate spring and the spring electrode terminal, and enables the generation and transfer of up and down movement by applying direct DC power without constructing a separate driving circuit. The present invention relates to a leaf spring dynamic micro vibrator.

Conventional vibrators can be divided into a rotation method that utilizes the asymmetric centrifugal force generated by rotating the eccentric mass as a vibration source, and a dynamic method of moving coil type, that is, a moving coil method, such as a structure and principle of a speaker. In the case of the rotation method, a direct current power source is used, but the dynamic method should use an AC power source due to its structural features.

In the past, as a vibrator for incoming calls in an ultra-small portable electronic device (particularly, a mobile phone), a cylindrical or coin-type motor rotary vibrator has been mainstream. However, in the recent two to three years, many micro-speaker companies in Korea and Japan have utilized the principles of the speaker and its theoretical structure to develop new markets in accordance with the demand for multifunctional components. We have proposed a vibration, acoustic composite mode micro speaker that integrates vibration and sound reproduction as an electrical signal source.

However, such a mixed mode micro speaker, even if matched with the original matching defect for the output signal transmission system of the mobile phone in the reproduction function of the vibration, the resonance frequency changes according to the change of the leaf spring progression. Due to the reduction of power, it is not practically commercialized.

On the other hand, there are two types of a motor-type vibrator of the rotation type, a core type and a coreless type, and the coreless type vibrator is mainly used for the incoming transmission of a portable terminal. The motors are basically formed in a cylindrical shape in which the rotor and the asymmetric mass are formed separately and combined. In addition, the asymmetrical centrifugal vacuum is not added by asymmetrically arranging coils wound around a part of the rotor shaft. Coin-type vibrators that enable the generation of motion are also commercialized.

As mentioned above, although the conventional technology has been mentioned, the motor-type vibrators using the asymmetric centrifugal force through rotation are completely different from the DC-driven dynamic micro vibrators according to the present invention and their vibration generating principle, and thus, will no longer be described below. I will not explain.

1 is a cross-sectional view showing the structure of a conventional AC drive dynamic vibration, acoustic composite mode micro speaker.

The conventional AC driving dynamic vibration, acoustic composite mode micro speaker includes a cylindrical frame 2 and a magnetic circuit portion and a sound generating portion mounted therein. Here, the yoke 9 of the magnetic circuit portion is fixed to the leaf spring 10 and the leaf spring 10 is fixed to the frame 2, whereby vibration is generated. Let's look at this more specifically.

The upper cover 1 is coupled to the upper side of the frame 2, the lower cover 3 is coupled to the lower side, the upper cover 1 is provided with a sound emitting port 12, and the lower cover 3 to the rear Ventilation is provided. The sound generating unit includes a diaphragm 5 and a voice coil 6, and the voice coil 6 receives power by connecting the voice coil lead wire 11 to the PCB electrode terminal 4. The magnetic circuit portion is composed of a circular plate 7, a permanent magnet 8, and a circular yoke 9, and the magnetic circuit portion acts as a mass of vibration to generate vibration.

Korean Patent Laid-Open Publication No. 2000-12495 discloses an external magnetic compound mode micro speaker, the structure of which is similar to that described above.

The vibration force generation of the AC drive dynamic acoustic / vibration combined mode micro speaker is determined by the lead coil 11 of the voice coil inserted at right angles into the air gap (space between the inside of the yoke and the outside of the plate) of the magnetic circuit. When a negative electrical signal is induced, an alternating rotating magnetic field corresponding to the positive or opposite direction and a directing magnetic field generated from a permanent magnet react with each other and are attracted or repelled.

At this time, the direction of force generated is determined by the direction of the direct current magnetic flux from the inside of the magnetic circuit air gap to the outside and the direction of the alternating rotation magnetic flux generated in the coil, and acts in the up or down direction based on the cross section of the air gap. Done. At this time, AC electric energy of full duty wave must be applied to the coil in order to repeat up and down in sequence. The magnitude of the generated force is proportional to the magnetic flux density in the air gap, the length of the coil and the magnitude of the current flowing in the coil. In addition, when the reaction angle between the magnetic field generated in the coil and the magnetic field present in the air gap is at right angles, it interacts with the greatest force, and the applied unit is Newton.

The above is a quote from Framing's left-handed rule, which is too well known for the interaction of two magnetic fields.

In the conventional vibrating body, the resonant frequency is determined by the correlation between the weight of the entire vibrating part and the rigidity based on the elasticity of the support, and the vibration width is the largest in the resonant part. In addition, the smaller the stiffness of the leaf spring, the braking support, the lower the resonant frequency. It is noted that the magnetic circuit structure has a much larger mass than the diaphragm structure. As a result, when a relatively large magnetic circuit structure is used as the vibration source, it is possible to generate a vibration frequency in a low region that the human body can feel well.

The vibration / acoustic composite mode micro speaker has the theoretical background based on the above principle, and reproduces the sound in the vibration mode at the maximum resonance point frequency of the magnetic circuit structure, and the frequency from the resonance point frequency of the light diaphragm structure to the maximum audible region. Use in mode.

In the AC dynamic vibration / acoustic composite mode micro speaker, only the components that provide two functional elements are integrated into one unit, and thus the cost reduction effect can be obtained by reducing the number of components mounted in the mobile phone set. In addition, since there is an alternating current method, there is an advantage that it is possible to secure the added value of adding various types of vibration functions according to the frequency of the driving signal source. However, in the case of existing mobile phones, the output control signal is composed of three separate types of independent outputs that do not share each other, which is a receiver for audio listening requiring a 32 ohm or 16 ohm termination load. It requires an output unit and an 8 ohm terminating load, and is divided into a micro speaker output unit for receiving incoming information as a ring tone or musical element, and a vibration output unit for transmitting the incoming information to the bodily sensation. Two outputs of the mobile phone are provided with an AC power source having a frequency in the audible region of the audio or musical element, but an output for vibration generation is provided with a DC power source that directly switches the battery power to a transistor. .

Therefore, the dynamic AC drive vibrator developed based on the principle of a conventional speaker has a fatal defect that it is impossible to generate continuous vibration even if it is connected to the vibration output unit of an existing mobile phone. Power supply and the driving method is AC method). In order to overcome this fatal flaw, there is a method of adding a conversion circuit capable of processing the vibration control DC power to AC power, but this is not practical because it provides another cost increase factor. Even though it is possible to provide an AC-type driving signal source through the change of the microprocessor, it is inevitably accompanied by the deterioration of the quality due to the vibration force deterioration caused by the change of the progression of the dynamic vibrator by the leaf spring. This is not a desirable direction. That is, when the use period of the leaf spring supporting the magnetic circuit portion becomes longer, the leaf spring loosens compared to the initial stage (this is called progressive change), and thus the resonance point (resonance frequency) is different from the initial stage. . Accordingly, when the resonant frequency is supplied in accordance with the initial state, the vibration force is lowered due to the different resonance point.

Therefore, the present invention is to solve the problems of the prior art as described above, the up and down vibration is made through a DC power supply without a separate drive circuit, the direct current driving does not occur the progressive vibration reduction phenomenon as always vibrating at the resonance point The purpose is to provide a dynamic micro vibrator of the type.

The present invention for achieving the above object, in the micro vibrator including a yoke, a permanent magnet, a plate, the spring holding the yoke fixedly; A coil positioned between the yoke and the plate and fixedly coupled; And at least two spring electrode terminals, one side of which is connected to a connection pattern of a printed circuit board, for switching the DC power supplied to the coil, and the other side of the spring electrode terminal being vertically bent portion of the leaf spring. And an insulator attached to an outer wall of the yoke from an end of the vertically bent extending portion of the leaf spring.

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As another example, preferably, the present invention is a micro vibrator including a yoke, a permanent magnet, and a plate, comprising: a leaf spring for holding and supporting the yoke; A coil positioned between the yoke and the plate and fixedly coupled; And at least two spring electrode terminals, one side of which is connected to a connection pattern of a printed circuit board, for switching the DC power supplied to the coil, the other side of the spring electrode terminals being in contact with an outer wall of the yoke that is a conductor. The insulator is attached to a lower side of the contact point of the spring electrode terminal.

Preferably, the printed circuit board has an annular ring shape, at least three connection pattern regions electrically separated from each other, a first spring electrode terminal connected to the first connection pattern region, and a second connection pattern region connected to the first connection pattern region. The second spring electrode terminal is connected to one coil lead wire, the other coil lead wire is connected to the third connection pattern region, and the first connection pattern region and the third connection pattern region are connected to an external DC power source. It is characterized by.

Preferably, the spring connection terminal is provided with a plurality of spring electrode terminals.

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

Figure 2a is a cross-sectional view of the direct-acting magnetic dynamic micro-vibrator according to the present invention, Figure 2b is a cross-sectional view of the direct-acting external magnetic type dynamic micro-vibrator according to the present invention, the magnetic and the magnetic is the permanent magnet inside the yoke? The technical features of the present invention are the same, as there is a difference in whether they are on the outside, and only the inner magnetic shape will be described later. Like reference numerals in FIGS. 2A and 2B denote like elements.

The greatest feature of the dynamic micro vibrator according to the present invention is that the magnetic circuit portion composed of the yoke 9, the permanent magnet 8, the plate 7 is supported by the leaf spring 16, and the coil 20 is fixed. By switching the supply state of the DC power supply in the above, the magnetic circuit part, which is a mass body, vibrates in the up and down directions. This will be described in more detail with reference to the accompanying drawings.

In Fig. 2A, the configuration of the circular yoke 9, the permanent magnet 8 and the circular plate 7 is the same as before. In addition, a housing guide 15 is provided in place of the frame, and one end of the leaf spring 16 is inserted into and fixed to the housing guide 15. The other end of the leaf spring 16 is bent and extended at right angles, and the portion bent at right angles is maintained by the magnetic circuit guide 17 while being in contact with the outer surface of the yoke 9. It is fixedly supported on the outer surface of the yoke 9. The insulator 21 is attached to a predetermined distance from the end of the portion which is bent and extended at right angles to the leaf spring outside the yoke. The insulator 21 supports the spring electrode terminal 19 to be described later to operate as a switch.

The coil 20 is fixedly coupled to the lower cover 3 in an insulated state. As shown in FIG. 2A, the position of the lower cover 3 to which the coil 20 is fixed protrudes, and the coil is protruded. 20 is fixedly coupled in an insulated state. PCB electrode terminal 4 has an annular ring shape as shown in Figures 4a to 4c to be described later, the PCB electrode terminal 4 is connected to the spring electrode terminal 19, which is the main part of the present invention, the coil 20 is connected via a drop line. One end of the spring electrode terminal 19 is connected to a terminal of a printed circuit board (PCB), and the other end of the spring electrode terminal 19 contacts a vertically bent surface of the leaf spring 16 of the conductor. The contact portion of the spring electrode terminal 19 has a streamlined shape. The spring electrode terminal 19 is in contact with the leaf spring 16 at four points. Here, since the leaf spring 16 is coupled to the yoke by the magnetic circuit guide 17, the magnetic circuit guide is also wrapped in the vertically bent portion of the leaf spring. However, since the spring electrode terminal is to be in electrical contact with the leaf spring, the magnetic circuit guide is removed for the portion where the spring electrode terminal is in contact with the leaf spring. The structure of the leaf spring 16 will be described later with reference to FIG. 3.

In the micro vibrator according to the present invention as described above, the leaf spring 16 has a portion extending bent at a right angle, is coupled to the yoke through the magnetic circuit guide, the spring electrode terminal 19 is in contact with the leaf spring 16 Although described as being, this may be modified as follows.

The leaf spring 16 and the yoke 9 may be combined in the same manner as in the prior art. That is, the yoke may be inserted into the central hole of the leaf spring 16 to be coupled using an adhesive or the like. In this case, the leaf spring 16 is not bent and has a structure as in the prior art. In this case, the magnetic circuit guide is unnecessary. The spring electrode terminal 19 is in contact with the outer wall of the yoke 9 of the conductor, and an insulator is formed below the contact point of the spring electrode terminal of the yoke. In other words, when the yoke is moved upward by attaching an insulator after forming a groove over a predetermined portion or the entire portion (band shape) at the lower side of the yoke or by attaching an insulator having a small thickness at the lower side of the yoke. (19) can be configured to be electrically switched. The insulating pad 18 is provided between the PCB electrode terminal and the lower cover 3 to prevent electrical contact therebetween, and the housing 14 is connected to the lower cover 3 to protect the components of the present invention. Combined.

3 is a plan view of a leaf spring, the structure of which is the same as a conventional leaf spring, except that the annular ring on the inner side is bent and extended vertically. In general, the leaf spring has a form in which the outer annular ring 16a and the inner annular ring 16b are joined by four support members 16c.

4A to 4C are views for explaining a structure of a PCB electrode terminal and a coupling state of a coil and a spring electrode terminal coupled to the PCB electrode terminal according to the present invention.

As shown in the drawing, the printed circuit board (PCB) has an annular ring shape, and the driving DC power connection patterns 4c and 4d extend from one side of the annular ring in order to connect with an external power supply terminal. The printed circuit board has connection patterns formed on both sides thereof, and as shown in FIG. 4A, the connection patterns of both sides are electrically connected to each other through the double-side energization positions 4a and 4b. 4A and 4I show connection patterns formed on the rear surface of the double-sided printed circuit board.

4B is a plan view illustrating a coil and a spring electrode terminal connected to a PCB. The coil 20 is positioned at a predetermined distance from the inside of the ring of the printed circuit board, and the coil is connected to the connection pattern of the printed circuit board through the coil lead wires 20a and 20b. At this time, one coil lead wire 20b is connected to the connection pattern 4e which is not electrically connected to the drive DC power connection pattern 4d, and the other coil lead wire 20a is connected to the drive DC power connection pattern 4d. The connection pattern 4e is electrically connected to the connection pattern 4i on the rear surface of the printed circuit board. And, the spring electrode terminal 19 is provided with four terminals to maintain the angle of 90 degrees to each other. The four spring electrode terminals 19a, 19b, 19c, and 19d are all connected to a connection pattern formed on the rear side of the printed circuit board. The four spring electrode terminals 19a, 19b, 19c, and 19d are not necessarily connected to the rear side connection pattern. It would be desirable to connect to the pattern.

As shown in the drawing, the connection patterns 4c and 4h form a first region, the connection patterns 4e and 4i form a second region, and 4d forms a third region, and each region is electrically connected. Separated by. Here, the first and second spring electrode terminals 19a and 19b which form an angle of 90 degrees to each other are connected to the first region, and the third and fourth spring electrode terminals 19c and 19d which form an angle of 90 degrees to each other are made of It is connected to two areas. Therefore, the first and second spring electrode terminals and the third and fourth spring electrode terminals are electrically separated from each other, and the first and second (or third and fourth) spring electrode terminals are electrically connected to each other. . The reason why the two spring electrode terminals are set in the present invention is, of course, to stabilize the electrical connection. The first lead wire 20a of the coil is connected to the third region, and the second lead wire 20b of the coil is connected to the second region. Due to this structure, the power supplied to the coil is switched when the spring electrode terminal contacts the insulator out of the vertical bending extension portion of the leaf spring.

5a to 5c are diagrams for explaining the operating principle of the dynamic vibrator according to the present invention.

Fig. 5A shows a state in which no power is supplied (initial state), and the magnetic flux acts in the direction of the arrow in the figure. In this state, when DC power is applied as shown in Fig. 5B, as shown in the figure, a rotating magnetic field is generated by the coil, thereby changing the traveling direction of the magnetic field generated from the permanent magnet. As a result, the coil is fixed to the lower cover, and the yoke is coupled to the leaf spring so that the magnetic circuit portion consisting of the yoke, the permanent magnet, and the plate rises upward. When the magnetic circuit portion rises as described above, as shown in FIG. 5C, the contact point of the spring electrode terminal is located in the insulator, so that the connection state between the spring electrode terminal and the leaf spring is broken, and as a result, the power supply to the coil is stopped. do. The magnetic field then maintains its original initial state and the magnetic circuit portion is restored to its original position by the leaf spring. When the magnetic circuit part is restored to its original position, the spring electrode terminal and the leaf spring contact each other to supply power to the coil. The above process is repeated until the power supply is stopped, and vibration is generated.

Although the present invention has been described above based on the preferred embodiments, these embodiments are only intended to illustrate the present invention, not to limit the present invention to those skilled in the art to which the present invention pertains without departing from the spirit of the present invention. It will be apparent that various changes, modifications or adjustments can be made. For example, the greatest feature of the present invention is to repeat the power supply and interruption continuously to the coil through the switch structure, it is known to those skilled in the art to adopt a variety of switch structure as long as the vibration force at the resonance point does not change It can be easily adopted.

Therefore, the protection scope of the present invention will be limited only by the appended claims, and should be construed as including all such changes, modifications or adjustments.

As described above, the present invention can effectively generate vibration even through a DC power supply, and can also generate vibration without a progressive decrease in vibration force due to always switching at a resonance point. Such a micro-vibrator according to the present invention can be immediately applied to a conventional mobile phone set without a separate conversion circuit, it is possible to implement a dynamic vibration, acoustic composite mode speaker of the direct-current combined use drive system through a modified design.

Claims (5)

delete In the micro vibrator including a yoke, a permanent magnet, a plate, A leaf spring for holding and supporting the yoke; A coil positioned between the yoke and the plate and fixedly coupled; And At least two spring electrode terminals of one side connected to the connection pattern of the printed circuit board to switch the DC power supplied to the coil, And the other side of the spring electrode terminal is in contact with the vertically bent extending portion of the leaf spring, and an insulator is attached to an outer wall of the yoke from an end of the vertically bent extension portion of the leaf spring. In the micro vibrator including a yoke, a permanent magnet, a plate, A leaf spring for holding and supporting the yoke; A coil positioned between the yoke and the plate and fixedly coupled; And At least two spring electrode terminals of one side connected to the connection pattern of the printed circuit board to switch the DC power supplied to the coil, And the other side of the spring electrode terminal is in contact with an outer wall of the yoke, which is a conductor, and an insulator is attached below the point where the spring electrode terminal is in contact. The method of claim 2 or 3, The printed circuit board has an annular ring shape and has at least three connection pattern regions electrically separated from each other. The first spring electrode terminal is connected to the first connection pattern region, the second spring electrode terminal and one coil lead wire are connected to the second connection pattern region, and the other coil lead wire is connected to the third connection pattern region. And the first connection pattern region and the third connection pattern region are connected to an external direct current power source. The method of claim 4, wherein And a plurality of spring electrode terminals provided in the one connection pattern region.

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