KR200456605Y1 - Linear Type Vibrator - Google Patents

Abstract

The present invention relates to a linear vibration generator for generating a vibration in the vicinity of the resonant frequency of the elastic structure capable of linear vibration.
More specifically, after the shock absorbing damper is coupled to the inside of the case, a spring coupled to each of the case and the yoke, a magnet coupled to the yoke, a flat yoke with a center hole coupled to the other side of the magnet, and a weight outside the yoke. The magnetic fluid is applied to the center hole and the edge of the planar yoke, and the coil is coupled to the conduction means on the base assembly so as to be disposed in the openings of the planar yoke and the yoke, and then the coil is connected to the conduction means on the base assembly. After the circuit is connected to provide a linear vibration generator that is configured by the final combination with the combination of the case and the part being subjected to.

Description

Linear Vibrator {Linear Type Vibrator}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a linear vibration generator, and more particularly, to a linear vibration generator for exciting a weighted body including a magnet supported by an elastic body near a resonance frequency. There may be several application cases, but I would like to explain it as an example of vibration generation used in mobile phones, PDAs, game machines, etc., which are increasing in recent years.

In general, among the most widely distributed to the public with the recent development of communication technology, mobile phones, personal digital assistants (PDAs) are well known. These devices are becoming smaller as they become smaller, making them portable as well as enabling voice and data input and output anywhere, anytime. Nowadays, not only vibrating function is required for public etiquette, but also vibrating function is provided when inputting data such as phone number or playing game by touch type. In addition, in the general game function, when a gun is shot or a sports game is generated by vibrating, it has begun to provide a function that allows the player to play the game more realistically. In this case, a motor that usually generates vibration is employed. In this case, the use of the vibration function increases the frequency of use of the vibration generator, thereby increasing the life expectancy and high reliability of the motor.

As a conventional vibration motor using a brush has a limit in technically ensuring a long life due to wear of contact parts such as a brush and a commutator, a linear vibration generator has appeared as a countermeasure. .

1 is a cross-sectional view of a conventional rotary vibration generator. The conventional flat vibration generator consists of a stator which is a fixed member and a rotor which is a rotating member. That is, the lower substrate 6 is coupled to the upper surface of the base 1, which is a circular flat plate, and the upper ends of the lead wires 4a and 4b and the leader wires are connected to an external power source. The conductor wires 5a and 5b and the brushes 7a and 7b are electrically connected to each other, and the washer-shaped magnets 16 having concentric circles are coupled to each other. The shaft 2 is assembled at the upper center of the base 1, and the case 3 is assembled on the opposite side of the base 1 around the shaft 2 so that the entire outer structure is formed by the base 1 and the case 3. Configure The shaft 2 serves to guide the rotation of the rotor described below, in which the commutator 9 is formed in a pattern of the substrate on the side with respect to the upper substrate 8 and is moved on the opposite side. Resin insulator 11 in a state in which two winding coils 10 wound by a (copper) line are coupled, a weight body 12 is coupled between two winding coils 10, and a bearing 13 is disposed at the center thereof. It is usually molded through injection and mechanically integrated. In order to reduce the rotational resistance of the contact portion by the base 1 or the case 3 when the rotor rotates, an upper washer 14 and a lower washer 15 made of a material having low frictional resistance may be added. Referring to the flow of current, an external current is applied to the lead wires 4a and 4b and the current flows to the brushes 7a and 7b along the pattern of the lower substrate 6 and then the upper substrate of the rotor ( After reaching the commutator 9 on one side of 8), it reaches the winding coil 10 along the pattern of the upper substrate 8 and flows inside the winding coil 10 to generate an electromagnetic force, thereby acting as an electromagnet. The magnet 16 located on the upper side and disposed to face the winding coil 10 interacts to generate rotational force.

This rotor is arranged to drive the winding coil 10, the weight body 12 to one side, so that the center of gravity is eccentric than the center of rotation to accompany the vibration during rotation. Such a vibration generator is called a brush type flat vibration generator.

This brush-type vibration generator changes the direction of the current by the sliding contact of the brush 7a.7b and the commutator 9, so that mechanical wear can not be avoided and it cannot respond to long life requirements. The vibration generator comes up.

As a linear vibration generator, a vibration generator has been proposed in Japanese Patent Laid-Open No. 1997-205763, and the structure proposed in this type of design is conceptually shown in FIGS. 2 and 3. Referring to FIG. 2, the vibration generating device includes a spring 120 disposed inside the case 112, and a magnet 142, a yoke 141, and a flat yoke 143 disposed on the spring 120. Magnetic field is generated by this. Coil 130 is disposed in the magnetic field, one end of the coil 130 is fixed to the inner surface of the base 111. The vibration generator is formed in the direction of the magnetic field and the direction of the current flowing along the coil 130 is vertical, if the current flows in the coil 130 in the direction of the magnetic field direction and the current according to the law of the left hand of Fleming In the vertical direction, ie, in FIG. 2, the magnetic field forming component supported by the spring 120 is moved. When the direction of the current applied to the coil 130 is continuously changed, the to-be-generated body continuously generates vertical vibration. Such a linear vibration generator can improve durability because there is no sliding contact unlike a rotary vibration generator. In addition, such a linear vibration generator has a structure capable of obtaining a vibration amount in a desired frequency band by generating a maximum displacement by using a resonance by deviating from the rotational structure that is a method for obtaining the vibration amount in a conventional brush type vibration motor. Here, the resonance frequency (fn) is influenced by the mass (m) and the spring constant (k) of the subject body as shown in Equation 1 below.

[Formula 1]

However, unlike the vibration motor of the conventional rotating structure, there is no wearable electrical contact, but without the shaft or bearings to guide the movement, it is a form that vibrates up and down on the spring, so that the up and down vibrating parts can be stably operated. Structural design is a key technology of linear vibrators.

As such, an example of the devised to ensure stable operation of the up and down vibrating part is introduced in FIG. 4. In FIG. 4, the shock and noise generated when the liquid is dispersed in the magnetic powder, ie, the magnetic fluid 245, on the yoke 212 to which the spring 220 is coupled, and the vibration amplitude is increased, resulting in mechanical contact. It suggests ways to reduce the risk.

In the conventional linear vibration generator technology of FIG. 2, since the vibrator is simply suspended only by a spring in the absence of a shaft or bearing for guiding the motion, when the structure is made as small as 10 mm (mm) in diameter, the upper and lower sides of the vibrator and the stator may be separated. There is a fatal flaw in which interference is easily caused from side to side, and thus vibration force is reduced or unpleasant noise is generated. Therefore, the practicality is greatly reduced when manufacturing only the mechanism structure of the invention in a compact structure.

An example devised as a countermeasure for this is the design of FIG. 4. In FIG. 4, when the magnetic fluid 245 is applied to the upper portion of the yoke 212 to which the spring 220 is coupled, the vibration amplitude becomes large, and mechanical contact occurs. It suggests ways to reduce the impact and noise generated. In terms of function, it is a design that improves practicality by reducing impact and noise even when interference with the upper part occurs in up and down vibration. However, the magnetic structure after the spring 220 is coupled to the case 212 due to the design structural factor proposed in the design of 4 Inevitably, the fluid 245 is applied, and thus the opening 213 is applied to the upper portion of the case 212 to apply the magnetic fluid 245 to apply the magnetic fluid 245 through the opening. It is difficult to apply, and it is not difficult to directly observe the applied state because it is applied between the mechanical parts, and when excessively applied, it is more difficult to remove the magnetic fluid 245. In addition, the magnetic fluid 245 is prevented from escaping, and there is a disadvantage in that a separate sealing operation is required in order to prevent foreign substances from entering. As a result, the manufacturing process is complicated and manufacturing costs are increased.

The present invention is coupled to the case 312 and the yoke 341, respectively, after the shock absorbing damper 313 inside the case 312, as shown in Figure 5 to the yoke 341 Coupled to the magnet 342 and magnetized in the vertical direction, the planar yoke (343) and the weight 344 to the outer side of the yoke (341) is coupled to the other side of the magnet 342, the yoke (341), Magnetic fluids 345a and 345b were applied to the center hole and the edge of the flat yoke 343, and then the coil 330 was energized to the surface so as to be disposed in the openings of the flat yoke 343 and the yoke 341. After coupling to the base assembly 311 having a (311a) and the coil 330 is connected to the current supply means 311a on the base assembly 311 and then the final coupling with the combination of the case 312 and the part being It consists of doing. The core contents of the present invention constitute the central hole of the planar yoke 343 and apply magnetic fluids 345a and 345b to the hole and the edge of the planar yoke 343. It stays at the hole and its edge.

The magnetic fluid 345a applied to the center hole of the flat yoke 343 together with the damper 313 coupled below the case 312 has an impact of vibrator and stator contacting the upper and lower parts when the vertical vibration is excessive. It will reduce the noise that is absorbed and unpleasant. In other words, unlike the conventional design, the damper 313 coupled to the bottom of the case 312 simply reduces the impact and noise when contacting at the top, and at the bottom, the magnetic fluid 345a is applied before the base assembly 311 is assembled. Appropriate amount can be applied and it can reduce the impact and noise when contacting from the bottom. Therefore, unlike the conventional design, it is possible to omit the cumbersome processes of making an opening for magnetic fluid application or resealing the opening, thereby simplifying the process and confirming the application state with the naked eye, thereby accurately controlling the required amount. It will be possible to improve.

 In addition, when the magnetic fluid 345a is applied to the center hole of the planar yoke 343, the magnetic fluid 345b is also applied to the edge of the planar yoke 343 by the action of the magnetic fluid 345b. And the distance between the magnet 342 or the coil 330 and the yoke 341 is kept constant to function as a shaft and a bearing in the conventional rotary vibration generator to prevent interference between the stator and the oscillator in the left and right radial directions. By preventing the vibration can be reduced or the occurrence of noise can be prevented.

Figure 1 shows a side cross-section of a conventional rotary vibration generator.
Figure 2 shows a side cross section of a conventional linear vibrator.
3 is a plan view showing a spring of a conventional linear vibration generator.
Figure 4 shows a side cross-section of a conventional linear vibration generator improvement.
5 shows a side cross section of the present invention.
6 shows other structural examples of the planar yoke of the present invention.

The present invention is a yoke made of a soft magnetic material and the case 312 after combining the shock absorbing damper 313 having elasticity, such as a resin foam material or rubber in the case 312 is generally made of a metal 341 is preferably a spring 320 is coupled by a welding method or an adhesive method, the magnet 342 is coupled to the yoke 341 and magnetized in the vertical direction, the plane having the center hole of the soft magnetic material The yoke 343 is attached to the other side of the magnet 342, and on the outside of the yoke 341, a weight body 344 made of a sintered article of high specific gravity such as tungsten is disposed, and the planar yoke 343 is disposed. Magnetic fluids 345a and 345b are applied to the center hole and the edge of the circuit, and the coil 330 is energized such as a thin circuit board or a metal terminal so as to be disposed in the openings of the flat yoke 343 and the yoke 341. (311a) After coupling to the base assembly 311 is provided with a circuit and is connected to the power supply means 311a on the base assembly 311 and then the final combination with the case 312 and the combination of the part to be subjected.

The present invention constitutes a central hole portion of the flat yoke 343 and applies magnetic fluids 345a and 345b to the hole portions and the edges of the flat yoke 343. It is characterized in that it stays at the hole part and its edge, but instead of making the hole part in the middle of the flat yoke 343, the same effect can be obtained by making various types of grooves in the center of the flat yoke 343 as shown in FIG. have.

312: case, 313: damper, 341: yoke, 320: spring, 342: magnet,
343: flat yoke, 344: weight, 345a, 345b: magnetic fluid, 330: coil
311a: energization means, 311: base assembly

Claims (4)

After the shock absorbing damper is coupled to the inside of the case, the spring is coupled to the case and the yoke respectively, the magnet is coupled to the yoke, the flat yoke with the center hole coupled to the other side of the magnet, and the weight is coupled to the outside of the yoke. And applying a magnetic fluid to the center hole and the edge of the planar yoke, and coupling the coil to a conduction means on the base assembly so as to be disposed in the openings of the planar yoke and the yoke, and then connecting the coil to the conduction means on the base assembly. After that, the linear vibration generator is configured by the final combination with the case and the part to be coupled The linear vibration generator according to claim 1, having a shape of a groove in the center of the flat yoke and applying magnetic fluid to the flat yoke groove and its edge.
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