KR100892318B1 - Linear vibrator - Google Patents

Abstract

A linear vibrator is disclosed. After the linear vibrator is raised or lowered by the electromagnetic force, the center of the magnet generating vibration while lowering or rising only by the elastic force of the spring is installed at the upper side or the lower side with respect to the center of the coil in the initial state. The weight is coupled to the bottom or top of the. As a result, the center of the magnet does not fall or rise above the predetermined distance or more than the predetermined distance with respect to the center of the coil, and thus, when the magnet moves by only the elastic force of the spring, no electromagnetic force interferes with the magnet. Therefore, the current can be applied to the coil over the entire period in which the magnet vibrates, so that not only the amplitude of the magnet can be obtained according to the design value but also the rising time, which is the time until the amplitude reaches 90% of the design value, is shortened. . In addition, due to the weight, in the initial state, there is no fear that the center of the magnet will be located at the point of the coil where the electromagnetic force becomes "0", and therefore, vibration is always generated when the current is initially applied. In addition, since the weight is made of metal, the amount of vibration is improved.

Description

Linear Vibrator {LINEAR VIBRATOR}

Figure 1a is a schematic configuration diagram for showing the operation principle of a conventional linear vibrator.

Figure 1b is a graph showing the electromagnetic force in the vibration section and the vibration section of a conventional linear vibrator.

2 is a perspective view of a linear vibrator according to a first embodiment of the present invention.

3 is a cross sectional view of FIG. 2.

Figure 4a is a schematic configuration diagram for showing the operating principle of the linear vibrator according to the first embodiment of the present invention.

Figure 4b is a graph showing the electromagnetic force in the vibration section and the vibration section of the linear vibrator according to the first embodiment of the present invention.

5 is a cross-sectional view of a linear vibrator according to a second embodiment of the present invention.

Figure 6a is a schematic configuration diagram for showing the operating principle of a linear vibrator according to a second embodiment of the present invention.

Figure 6b is a graph showing the electromagnetic force in the vibration section and the vibration section of the linear vibrator according to the second embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: case 115: lower case

120: FPCB 131,133: first and second coil

140,240: Spring 150,250: Magnet

170,270: Weight

The present invention relates to a linear vibrator.

In general, the communication device has a built-in incoming signal generator for informing the incoming. An incoming signal generator includes an acoustic generator or a vibration generator, which will be described with reference to FIGS. 1A and 1B of a conventional linear vibrator that generates vibration while linearly vibrating.

Figure 1a is a schematic configuration diagram for showing the operation principle of a conventional linear vibrator, Figure 1b is a graph showing the electromagnetic force in the vibration section and the vibration section of the conventional linear vibrator.

As shown, the upper side of the magnet 11 magnetized in the Y-axis direction is disposed so as to be the S pole, the lower side is the N pole, and a spring (not shown) connected to the magnet 11 is fixed to the upper side of the magnet 11. do. A coil 15a through which current flows in the forward direction is disposed on the left side of the magnet 11, and a coil 15b through which current flows in the reverse direction is disposed on the right side of the magnet 11. At this time, in the initial state, the centers O1 and O2 of the magnet 11 and the coils 15a and 15b in the Y-axis direction coincide with each other.

Then, among the lines of magnetic force from the magnet 11, the components of the X-axis direction of the magnetic force lines of the magnets 11 directed to the coils 15a and 15b and the Z-axis components of the electric force lines generated from the coils 15a and 15b. Lorentz force law is established.

At this time, when the Y-axis center O1 of the magnet 11 oscillating in the Y-axis direction is between the AB sections based on the center O2 of the coils 15a and 15b, the magnets 11 to the coils 15a. The X-axis component of the line of magnetic force directed toward 15b and the X-axis component of the line of magnetic force directed from the coils 15a and 15b to the magnet 11 are at the upper and lower sides with respect to the center O2 of the coils 15a and 15b. The same affects for the current direction. As a result, the magnet 11 is lifted upward by the (+) electromagnetic force.

However, when the center O1 of the magnet 11 descends more than a predetermined distance from the center O2 of the coils 15a and 15b and is located at the point “B”, the magnet 11 is directed toward the coils 15a and 15b. The X-axis component of the line of magnetic force and the X-axis component of the line of magnetic force directed from the coils 15a and 15b to the magnet 11 affect only the current direction below the center O2 of the coils 15a and 15b. The electromagnetic force is zero.

In addition, when the magnet 11 is located below the "B" point, only the X-axis component of the magnetic force line directed from the magnet 11 to the coils 15a and 15b is centered (O2) of the coils 15a and 15b. By influencing only the lower current direction with reference to), a negative (-) electromagnetic force that pulls the magnet 11 downward is formed.

In other words, assuming that the magnet 11 is designed to vibrate the AC section, when a current is applied to the coils 15a and 15b, the magnet 11 moves upward and then moves downward by the elastic force of the spring. do. However, when the magnet 11 moves downward by the elastic force of the spring, current is applied to the coils 15a and 15b only when the magnet 11 moves upward so that the electromagnetic force does not interfere. If (11) moves downward, no current is applied.

That is, in the conventional linear vibrator which generates vibration by generating electromagnetic force in only one direction, when the magnet 11 descends by more than B points, and tries to move upward by the elastic force of the spring, the negative electromagnetic force is applied between the CB sections. This is formed to pull the magnet 11 to move upward. Therefore, the section in which the current can be applied to the coils 15a and 15b for generating the positive electromagnetic force is the section B-A in which the magnet 11 moves from the lower side to the upper side. That is, since the current can be applied to the coils 15a and 15b only in the B-A section smaller than the design value vibration section of the magnet 11 designed to vibrate between the A-C sections, the electromagnetic force acting on the magnet 11 is reduced. As a result, not only the amplitude of the design value can be obtained but also the rising time required to obtain an amplitude corresponding to 90% of the design value is delayed.

Further, due to the dispersion in the manufacturing process of the linear vibrator, in the initial state, when the Y axis center O1 of the magnet 11 is shouting at a position "B" where the electromagnetic force becomes zero, the coils 15a and 15b. ) May cause a problem that vibration does not occur even when a current is applied.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to provide a linear vibrator that can not only obtain the amplitude of the design value, but also shorten the rising time.

Another object of the present invention is to provide a linear vibrator which always vibrates when an electric current is applied in an initial state.

Linear vibrator according to the present invention for achieving the above object, a case formed with a predetermined space therein; A flexible printed circuit board (FPCB) fixed to a bottom surface of the case; First and second coils respectively provided at both side surfaces of the case and connected to the FPCB; A spring having one side coupled to an upper surface of the case; The spring is fixed to the spring, and one side and the other side are disposed to face the first coil and the second coil, respectively, and move upward or downward by the action of the first and second coils. Magnet vibrating while moving downward or upward by the elastic force of the; And restricting the magnet from falling down or rising more than a predetermined amount based on the centers of the first and second coils, so that the first coil, the magnet, and the magnet are moved when the magnet is moved by an elastic force of the spring. Means for preventing electromagnetic forces generated by the second coil and the magnet from interfering with the movement of the magnet.

Hereinafter, a linear vibrator according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view of a linear vibrator according to a first embodiment of the present invention, and FIG. 3 is a cross sectional view of FIG.

First Example

As shown, a case 110 having a predetermined space formed therein is provided. The case 110 is coupled to the upper case 111 and the upper case 111 with the lower surface open, and has a lower case 115 with the upper and front and rear surfaces open. At this time, the upper case 111 and the lower case 115 is preferably provided in a square.

A flexible printed circuit board (FPCB) 120 is fixed to a lower surface of the lower case 115 by an adhesive or the like, and the display holes 116 and 121 which indicate positions of mutually coupled positions on the lower surface of the lower case 115 and the FPCB 120. Is formed correspondingly. In addition, support pieces 117a, 117b, 118a, and 118b are integrally formed on both front and rear ends of the lower case 115. The support pieces 117a, 117b, 118a, and 118b support the outer surface of the FPCB 120 to prevent the FPCB 120 from escaping to the front side and the rear side of the lower case 115.

The FPCB 120 is inserted between the lower surface of the lower case 115 and one side 115a and is fixed to the lower case 115. In order to be able to insert the FPCB 120 between the lower surface of the lower case 115 and one side 115a, the lower surface of one side 115a of the lower case 115 has a predetermined distance from the lower surface of the lower case 115. Have

The first coil 131 and the second coil 133 are closely attached to both side surfaces 115a and 115b of the lower case 115, and the first coil 131 and the second coil 133 are fixed to the FPCB 120. Connected with. The first coil 131 and the second coil 133 are formed by winding in a vertical direction, in order to increase the electromagnetic force generated by the action of the magnet 150 to be described later, the first coil 131 and the second coil ( 133 is preferably wound on the outer surface of the core 138. In addition, one side surface 115a and the other side 115b of the lower case 115 has a support hole 119 into which the core 138 is inserted and supported.

A spring 140 having a first arm 141, a second arm 144, and a receiving part 147 is coupled to an upper surface of the upper case 111.

The first arm 141 is fixed to the upper end portion side of the upper case 111, the lower end side is located on the lower side of the upper surface of the upper case 111. The second arm 144 is fixed to the upper end side of the upper surface center portion of the upper case 111, the lower end side is located below the upper surface of the upper case 111. Thus, the first and second arms 141 and 144 are arranged in the longitudinal direction of the upper case 111 to form a cantilever shape. The accommodating part 147 is provided in a rectangular shape in which one side and the bottom are open, one side is coupled to the free end side of the first arm 141 and the other side is coupled to the free end side of the second arm 144.

The magnet 150 is formed in a shape corresponding to the accommodating part 147, is inserted into and fixed to the accommodating part 147, and is located between the first coil 131 and the second coil 133. One side and the other side of the magnet 150 face the first coil 131 and the second coil 133, respectively. Therefore, when the current is applied to the first and second coils 131 and 133, the magnet 150 is moved upward or by the action of the electric field generated in the first and second coils 131 and 133 and the magnetic field generated in the magnet 150. When the movement to the lower side, and the magnet 150 cuts off the current supplied to the first and second coils (131, 133) at the top dead center or bottom dead center, the magnet 150 by the elastic force of the spring 140 Exercise down or up. The vibration is generated by repetition of this operation, which will be described later.

On the upper surface of the upper case 111 and the first and second arms 141 and 144, display holes 112 and 141a and 113 and 144a indicating positions of mutual coupling are respectively formed.

The lower surface of the magnet 150 may hit the FPCB 120 by the vertical vibration of the magnet 150. Then, the FPCB 120 is damaged and noise is generated at the same time. In order to prevent this, a magnetic fluid 160 is fixed to the bottom of the lower case 115. Magnetic fluid is a fluid in which 0.01 to 0.02 μm ultrafine magnetic powder is dispersed in a colloidal shape in a liquid, and then surfactant is added to prevent precipitation or aggregation. The magnetic fluid is characterized in that the concentration of magnetic particles in the fluid is kept constant even if external magnetic fields, gravity, centrifugal force, etc. are applied.

Figure 4a is a schematic configuration diagram for showing the operating principle of the linear vibrator according to the first embodiment of the present invention, Figure 4b is an electromagnetic force in the vibration section and the vibration section of the linear vibrator according to the first embodiment of the present invention As a graph, this is explained.

The linear vibrator which generates vibration by generating electromagnetic force only in one direction increases the amplitude of the vibrating body by a predetermined or more, so that when the center of the vibrating body falls by more than the predetermined or rises more than the predetermined center, the vibrating body is moved by the elastic force of the spring. Electromagnetic force is generated in a direction opposite to the intended direction, which interferes with the vibration of the vibrating body.

That is, as shown in FIG. 4A, in order to vibrate the magnet 150 in the vertical Y axis direction, an electromagnetic force acting on the magnet 150 is generated in the Y axis direction. To this end, the magnet 150 is magnetized in the Y-axis direction so that the upper surface side is disposed so that the S pole lower surface side is the N pole. The first and second coils 131 and 133 are wound in the vertical direction to apply current to the first coil 131 in the forward direction, and to apply the current to the second coil 133 in the reverse direction. Then, when a current is applied to the first and second coils 131 and 133, the positive electromagnetic force and the second coil in the (+) Y-axis direction generated by the action of the first coil 131 and the magnet 150. The magnet 150 rises in the (+) Y-axis direction by (+) electromagnetic force in the (+) Y-axis direction generated by the action of 133 and the magnet 150. When the magnet 150 rises to the maximum, when the currents applied to the first and second coils 131 and 133 are blocked, the magnet 150 is driven by the elastic force of the spring 140 (see FIG. 3). Descending direction. When the magnet 150 descends as much as possible in the negative (-) Y-axis direction, when a current is applied to the first and second coils 131 and 133, the magnet 150 is controlled by the elastic force and the positive electromagnetic force of the spring 140. ) Increases in the (+) Y-axis direction. As described above, the magnet 150 is vibrated by repeatedly applying and blocking current to the first and second coils 131 and 133.

At this time, when the center O3 of the magnet 150 in the Y-axis direction is located near the center O4 of the first and second coils 131 and 133 in the Y-axis direction, the positive (+) Y-axis direction is (+). Electromagnetic force is formed.

However, when the center O3 of the magnet 150 drops by a predetermined distance from the center O4 of the first and second coils 131 and 133, the magnetic force lines directed from the magnet 150 to the first and second coils 131 and 133. X-axis component of the direction and the X-axis component of the line of magnetic force from the first and second coils (131,133) to the magnet 150, the current direction of the lower side relative to the center (O2) of the first and second coils (131,133) This only affects the electromagnetic force, and the electromagnetic force becomes "0".

In addition, when the center O3 of the magnet 150 is lowered by more than a predetermined amount, only the X-axis direction component of the magnetic force line directed from the magnet 150 to the first and second coils 131 and 133 may be the first and second coils 131 and 133. By influencing the lower current direction with respect to the center (O4) of), a negative (-) electromagnetic force in the (-) Y-axis direction is formed.

That is, when the center (O3) of the magnet 150 is located below the predetermined or more (-) electromagnetic force that pulls the magnet 150 in the (-) Y-axis direction, so the magnet by the elastic force of the spring 140 When (150) tries to rise in the (+) Y-axis direction, (-) electromagnetic force interferes with the rise of the magnet 150.

In order to prevent this, in the linear vibrator according to the present embodiment, the magnet 150 is restricted from falling by more than a predetermined amount based on the center O4 of the coils 131 and 133, and the magnet 150 is controlled by the elastic force of the spring 140. When is raised, means are provided to prevent the electromagnetic force generated by the first coil 131 and the magnet 150 and the second coil 133 and the magnet 150 from interfering with the movement of the magnet 150. .

In the initial state, in the initial state, the Y-axis center O3 of the magnet 150 is installed to be located above the Y-axis center O4 of the first and second coils 131 and 133, and the magnet 150 is disposed. It is provided that the plate-shaped metal weight 170 is provided on the bottom surface of the plate.

The weight 170 is in contact with the bottom surface of the lower case 115 (see Fig. 3) when the magnet 150 is lowered by more than a predetermined (-) Y-axis direction, so that the center of the Y-axis direction O3 of the magnet 150 is The lowering of the first and second coils 131 and 133 in the Y-axis direction center O4 by more than a predetermined level is prevented.

Then, the vibration section of the magnet 150, as shown in Figure 4b, the magnet 150 is raised by the elastic force of the spring 140 because it does not vibrate below the "L" point where the (-) electromagnetic force is formed When not in operation, it is not subject to interference by (-) electromagnetic force.

That is, the current may be applied to the first and second coils 131 and 133 in the L-M section in which the magnet 150 rises by the elastic force of the spring 140. Therefore, not only the amplitude of the magnet 150 corresponding to the design value can be obtained, but also the rising time required to reach the amplitude corresponding to 90% of the design value can be reduced. In addition, since the metal weight 170 is coupled to the magnet 150, a large vibration amount can be obtained.

2nd Example

FIG. 5 is a cross-sectional view of a linear vibrator according to a second embodiment of the present invention, illustrating only differences from the first embodiment.

As shown, in the initial state, in the initial state, the magnet 250 is disposed so that the upper surface side of the magnet 250 is the N pole, and the lower surface side is the S pole, so that the magnet 250 is moved in the (-) Y-axis direction. This causes the negative (-) electromagnetic force to be drawn. At this time, the Y-axis center O5 (see FIG. 6A) of the magnet 250 is located below the Y-axis center O6 (see FIG. 6A) of the first and second coils 231 and 233. Then, the weight 260 is provided between the magnet 250 and the spring 240 to prevent the magnet 250 from rising above a predetermined level.

The operation of the linear vibrator according to the second embodiment of the present invention configured as described above will be described with reference to FIGS. 6 to 6B. Figure 6a is a schematic configuration diagram for showing the operating principle of the linear vibrator according to the second embodiment of the present invention, Figure 6b is an electromagnetic force in the vibration section and the vibration section of the linear vibrator according to the second embodiment of the present invention This is the graph shown.

As shown, in the initial state, when current is applied to the first and second coils 231 and 133, the magnet 250 descends in the negative (-) Y-axis direction by (-) electromagnetic force. At the moment when the magnet 250 descends to the maximum, when the current applied to the first and second coils 231 and 233 is blocked, the magnet 150 rises in the positive Y-axis direction by the elastic force of the spring 240. . Then, when the magnet 250 is applied to the first and second coils 231 and 233 at the moment when the magnet 250 rises to the maximum in the (+) Y-axis direction, the magnet 250 is driven by the elastic force and the negative electromagnetic force of the spring 240. ) Drops in the minus Y-axis direction. As described above, the magnet 250 is vibrated by repeatedly applying and blocking current to the first and second coils 231 and 233.

However, the magnet 250 rises by more than a predetermined amount, and the Y-axis center O5 of the magnet 250 passes through the Y-axis center O6 of the first and second coils 231 and 233 at the "R" point. When it reaches, the electromagnetic force is "O". Then, when the center of the magnet 250 is located further above the "R" point, (+) electromagnetic force in the (+) Y-axis direction is formed, thereby raising the magnet 250 to descend in the (-) Y-axis direction. . However, due to the weight 260 provided between the magnet 250 and the spring 240, the Y axis center O5 of the magnet 250 is not located above the "R" point, so that the positive electromagnetic force is Does not occur. Therefore, the magnet 250 descending in the negative (-) Y-axis direction by the spring 240 is not subjected to electromagnetic force interference.

As described above, the linear vibrator according to the present invention after raising or lowering by the electromagnetic force, the center of the magnet generating vibration while lowering or rising only by the elastic force of the spring, based on the center of the coil in the initial state It is installed on the upper side or the lower side, the weight is coupled to the bottom or upper surface of the magnet. As a result, the center of the magnet does not fall or rise above the predetermined distance or more than the predetermined distance with respect to the center of the coil, and thus, when the magnet moves by only the elastic force of the spring, no electromagnetic force interferes with the magnet. Therefore, the current can be applied to the coil over the entire period in which the magnet vibrates, so that not only the amplitude of the magnet can be obtained according to the design value but also the rising time, which is the time until the amplitude reaches 90% of the design value, is shortened. .

In addition, due to the weight, in the initial state, there is no fear that the center of the magnet will be located at the point of the coil where the electromagnetic force becomes "0", and therefore, vibration is always generated when the current is initially applied.

In addition, since the weight is made of metal, the amount of vibration is improved.

In the above, the present invention has been described in accordance with one embodiment of the present invention, but those skilled in the art to which the present invention pertains have been changed and modified without departing from the spirit of the present invention. Of course.

Claims (11)

A case having a predetermined space formed therein; A flexible printed circuit board (FPCB) fixed to a bottom surface of the case; First and second coils respectively provided at both side surfaces of the case and connected to the FPCB; A spring having one side coupled to an upper surface of the case; The spring is fixed to the spring, and one side and the other side are disposed to face the first coil and the second coil, respectively, and move upward or downward by the action of the first and second coils. Magnet vibrating while moving downward or upward by the elastic force of the; And The first coil, the magnet and the first when the magnet is moved by the elastic force of the spring by limiting the magnet is lowered or lowered more than the predetermined or ascending more than the predetermined relative to the center of the first and second coils And means for preventing electromagnetic forces generated by the coil and the magnet from interfering with the movement of the magnet. The method of claim 1, Assuming that the vibration direction of the magnet is the Y-axis direction, The magnet is disposed so that the upper surface side is the S pole lower surface side and the N pole so that the direction of the electromagnetic force acting on the magnet is in the positive (+) Y axis direction, and the first and second coils are wound in the vertical direction. One is forward and the other is reversed, The means, The center of the Y-axis direction of the magnet is located above the center of the Y-axis direction of the first and second coils, When the magnet is lowered in the Y-axis direction by more than a predetermined amount, the magnet is in contact with the bottom surface of the case, and the Y-axis center of the magnet is predetermined based on the Y-axis center of the first and second coils. A linear vibrator, comprising: a weight for preventing abnormal dropping. The method of claim 1, Assuming that the vibration direction of the magnet is the Y-axis direction, The magnet is disposed so that the upper surface side is the N pole lower surface side and the S pole so that the direction of the electromagnetic force acting on the magnet is (-) Y-axis direction, the first and second coils are wound in the vertical direction Is forward and the other is reversed. The means, The center of the Y-axis direction of the magnet is located below the center of the Y-axis direction of the first and the second coil, Is provided between the magnet and the spring to prevent the magnet from rising in the Y-axis direction more than a predetermined relative to the Y-axis center of the first and second coil even if the magnet rises in the Y-axis direction more than a predetermined Linear vibrator, characterized in that the weight. The method of claim 2 or 3, And said weight is made of metal. The method of claim 2 or 3, The case is coupled to the upper case and the upper case and the lower case is open and linear vibrator, characterized in that the upper surface and the front and rear and the lower case is open. The method of claim 5, wherein The FPCB is fixed to the lower surface of the lower case, The lower case and the FPCB are formed to correspond to the display hole for indicating the position that is mutually coupled, The front side and the rear side of the lower case linear vibrator, characterized in that the support piece is formed integrally to the lower case to prevent the FPCB from escaping to the front side and the rear side of the lower case. The method of claim 6, One side lower end of the lower case has a predetermined distance from the lower surface of the lower case, The FPCB is a linear vibrator, characterized in that inserted into the interval between the lower surface and one lower surface of the lower case is fixed to the lower surface of the lower case. The method of claim 5, wherein The spring is disposed in the longitudinal direction of the upper case is provided in a rectangular shape, the upper end side is coupled to the upper surface of the upper case and the lower end side is located on the upper side of the upper case to form a cantilever shape, the first and second arms (Arm), It is provided in a shape corresponding to the magnet is fixed to the magnet, one side is coupled to the free end side of the first arm, the other side is a linear vibrator, characterized in that it has a receiving portion coupled to the free end side of the second arm. The method of claim 8, The upper surface of the upper case and the first and the second arm is a linear vibrator, characterized in that the display hole for indicating the position coupled to each other are formed correspondingly. The method of claim 2 or 3, The first and second coils are wound on a core, The side of the case is a linear vibrator, characterized in that the support hole is formed is supported by the core is inserted. The method of claim 5, wherein The bottom surface of the lower case is a linear vibrator, characterized in that the magnetic fluid (Magnetic Fluid) is in contact with the vibrating magnet or the weight.

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