阅读说明：本技术 水平线性振动电机 (Horizontal linear vibration motor ) 是由 姜振善 崔教锡 朴贤濬 金华植 李宗基 于 2021-08-16 设计创作，主要内容包括：本发明涉及一种线性振动电机,尤其涉及一种比现有的线性电机更加小型化,使得中间振动增强的便于安装于手表、智能腕带上的便于安装小型水平线性振动电机。(The invention relates to a linear vibration motor, in particular to a small horizontal linear vibration motor which is more miniaturized than the existing linear motor, enhances the middle vibration and is convenient to mount on a watch and an intelligent wrist strap.)

1. A linear vibration motor, characterized by comprising a bracket (100) formed with a housing, fixing a flexible printed circuit board (200) so that a leakage magnetic flux is shielded;

a flexible printed circuit board (200) mounted on an upper portion of the bracket (100) such that an external power is supplied to the coil (300);

a coil (300) which generates an electromagnetic field by an external signal and amplifies horizontal vibration by the action of a magnet (400), and which is provided on the flexible printed circuit board (200);

a magnet (400) fixed to the plate (600) by a permanent magnet, generating a magnetic field, and horizontally vibrating the weight section (500) to the left and right by the action of the magnetic field of the coil (300);

a weight part (500) connected with the spring (700), and used for amplifying vibration by weight and determining resonance frequency so as to fix the plate part (600);

a plate part (600) fixed to the weight part (500) and combined with the magnet (400) to form a closed magnetic field loop so that the magnetic field is concentrated;

a spring (700) connected to the box part (800) and the weight part (500) to amplify vibration and determine a resonance frequency;

a box part (800) forming an outer case to protect the weight part (500), fixing the spring (700) so that leakage magnetic flux is shielded;

a support (900) that fixes the spring (700);

a first spring piece (710) fixed to the inner side surface of the box part (800) by a first support part (910) maintaining a predetermined height when the first spring piece (710) is mounted on the box part (800) by protruding a predetermined height (H) toward the upper part of the first spring piece (710), a second spring piece (720) fixed to the outer side surface of the weight part (500) by a second support part (920) at a predetermined distance from the first spring piece (710), and a third spring piece (730) having an arch shape at the lower part and having a horizontal shape at the upper part connected to the first spring piece (710) and the second spring piece (720) are connected to each otherIn this configuration, a linear space (S) capable of linear motion is provided by bending the weight section (500) from the end of the first support section (910) by a predetermined angle (alpha), which is 5 DEG or more.

Technical Field

The invention relates to a linear vibration motor, in particular to a small horizontal linear vibration motor which is more miniaturized than the existing linear motor, enhances the middle vibration and is convenient to mount on a watch and an intelligent wrist strap.

Background

With the recent rapid development of wireless communication technology, portable communication devices have been increasingly downsized and light-weighted, and with the trend toward downsizing and light-weighting, components including mechanism devices, IC chips, and circuits mounted inside the portable communication devices have become highly concentrated and highly functionalized, and therefore, in order to improve space utilization, improvements in size and shape are required.

In addition, a flat vibration motor, which is mounted inside a portable communication device and gives information arrival by silent vibration, has been studied in a large amount in accordance with the above-described trend.

The initial model of the vibration motor mounted in the portable communication device is a rotary vibration motor having a stator and a rotor as basic structures, in which a rod is fixed to a holder of the stator and the rotor is supported and rotated by the rod to generate vibration, and in order to increase the vibration force, the rotor is increased in size or the number of revolutions is increased to improve the vibration force.

A horizontal vibration type actuator type vibration motor in which such a problem is improved has recently been widely used because it has a longer life span, overcomes a limit of size, and can obtain a fast response speed, compared to a rotary type vibration motor.

In addition, the horizontal vibration motor makes the internal parts not to be impacted by the vibration body, so that the life span of the vibration motor can be increased, and the vibration force can be increased to manufacture a more excellent vibration motor, and thus it is required to continuously develop a vibration motor having more improved durability and vibration force.

Documents of the prior art

Patent document

(patent document 1) laid-open patent publication No. 10-2010-0073301 (2010.07.01.)

Disclosure of Invention

Technical problem to be solved

The present invention has been made to solve the problems occurring in the prior art, and an object of the present invention is to provide a horizontal linear vibration motor. The concentration degree of electromagnetic field is maximized in the middle of to make the vibration characteristic obtain promoting, provide one kind and more miniaturized than current linear electric motor, make the small-size horizontal linear vibration motor of being convenient for install on wrist-watch, intelligent wrist strap of being convenient for of middle vibration reinforcing.

Technical scheme

In order to achieve the above object, the present invention provides a linear vibration motor, which includes a bracket 100 formed with a housing, fixing a Flexible Printed Circuit Board (FPCB)200 so that a leakage magnetic flux is shielded;

a flexible printed circuit board 200 mounted on an upper portion of the bracket 100 such that an external power is supplied to the coil 300;

a coil 300 for generating an electromagnetic field by an external signal and amplifying horizontal vibration by the action of the coil 300 with the magnet 400, the coil being provided on the flexible printed circuit board 200;

a magnet 400 fixed to the plate 600 by a permanent magnet, generating a magnetic field, and horizontally vibrating the weight part 500 by the magnetic field of the coil 300;

a weight part 500 connected to the spring 700, for amplifying vibration by weight and determining a resonance frequency so that the plate part 600 is fixed;

a plate part 600 fixed to the weight part 500 to be coupled to the magnet 400 to form a closed magnetic field loop so that a magnetic field is concentrated;

a spring 700 connected to the case part 800 and the weight part 500 to amplify vibration and determine a resonance frequency;

a box part 800 forming a housing to protect the weight part 500 and fixing the spring 700 so as to shield the leakage flux;

a support 900 to fix the spring 700; by increasing the electromagnetic field force, it is possible to drive at a fast response speed and a wide frequency band.

Effects of the invention

Therefore, the present invention enables driving at a fast response speed and a wide frequency band by improving the electromagnetic field force.

Further, the concentration of the electromagnetic field is thereby maximized, thereby improving the vibration characteristics.

Further, the linear motor is miniaturized by generating strong vibration compared to the conventional linear motor, and can be mounted on a small portable device.

Drawings

Fig. 1 is an exploded perspective view of a horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 2a is a cross-sectional view of a horizontal linear vibration motor according to an embodiment of the present invention, and fig. 2b is a longitudinal sectional view of the horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 3 is a front view and a side view illustrating a spring of an important part of a horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 4 is a magnetic field distribution diagram and a magnetic field flow diagram illustrating a bracket and a tank part in the horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 5 is a view showing a distribution pattern of a non-magnetic material and a magnetic flux for a bracket and a box part in a horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 6a is a cross-sectional view of a horizontal linear vibration motor according to another embodiment of the present invention, and fig. 6b is a longitudinal sectional view of a horizontal linear vibration motor according to another embodiment of the present invention.

Fig. 7a is a longitudinal sectional view illustrating a stopper rod (stopper) type damper before being activated in a horizontal linear vibration motor according to another embodiment of the present invention, and fig. 7b is a longitudinal sectional view illustrating a stopper rod type damper after being activated in a horizontal linear vibration motor.

Description of the reference numerals

100: support 200: flexible printed circuit board

300: coil 400: magnet

500 weight part 600 plate part

700: spring 710: first spring plate

720, a second spring plate 730, a third spring plate

800 case part 900 supporting part

910, a first supporting portion 920, a second supporting portion

S is a linear space part

Detailed Description

The present invention may be modified in various ways and may have various embodiments, and specific embodiments will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these specific embodiments, and it should be understood that the present invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

In order that those skilled in the art will be able to understand the present invention in more detail, embodiments of the present invention are provided. Therefore, the forms of the respective elements shown in the drawings may be exaggerated for the purpose of more clearly illustrating the forms, and a detailed description thereof will be omitted when it is considered that a detailed description of the related known art may obscure the gist of the present invention in describing the present invention.

The terms first, second, etc. may be used when describing various components, but these components are not limited to these terms. The terms are only used to distinguish one constituent element from other constituent elements.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "a" or "an" when used in this specification is not meant to imply a limitation to the number of items.

In the present invention, the terms "including" or "having" are used to indicate the presence of the features, numerals, steps, actions, components, elements, or combinations thereof described in the specification, and it is to be understood that the presence or possibility of addition of one or more other features, numerals, steps, actions, components, or combinations thereof is not previously excluded.

First, the present invention relates to a horizontal linear vibration motor including at least one or more of a bracket 100, a flexible printed circuit board 200, a coil 300, a magnet 400, a weight portion 500, a plate portion 600, a spring 700, a box portion 800, and a support portion 900.

Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings.

Referring to fig. 1 to 3, fig. 1 is an exploded perspective view of a horizontal linear vibration motor according to an embodiment of the present invention.

Fig. 2a is a cross-sectional view of a horizontal linear vibration motor according to an embodiment of the present invention, and fig. 2b is a longitudinal sectional view of the horizontal linear vibration motor according to an embodiment of the present invention. Fig. 3 is a front view and a side view illustrating a spring of an important part of a horizontal linear vibration motor according to an embodiment of the present invention.

A horizontal linear vibration motor according to an embodiment of the present invention includes a bracket 100 formed with a housing, fixing a Flexible Printed Circuit Board (FPCB)200 so that a leakage magnetic flux is shielded; a flexible printed circuit board 200 mounted on an upper portion of the bracket 100 such that an external power is supplied to the coil 300; a coil 300 for generating an electromagnetic field by an external signal and amplifying horizontal vibration by the action of the coil 300 with the magnet 400, the coil being provided on the flexible printed circuit board 200; a magnet 400 fixed to the plate 600 by a permanent magnet, generating a magnetic field, and horizontally vibrating the weight part 500 by the magnetic field of the coil 300; a weight part 500 connected to the spring 700, for amplifying vibration by weight and determining a resonance frequency so that the plate part 600 is fixed; a plate part 600 fixed to the weight part 500 to be coupled to the magnet 400 to form a closed magnetic field loop so that a magnetic field is concentrated; a spring 700 connected to the case part 800 and the weight part 500 to amplify vibration and determine a resonance frequency; a box part 800 forming a housing to protect the weight part 500 and fixing the spring 700 so as to shield the leakage flux; a support 900 to fix the spring 700; by increasing the electromagnetic field force, it is possible to drive at a fast response speed and a wide frequency band.

Here, the spring 700 includes a first spring piece 710 positioned at the front and a second spring piece 720 positioned at the rear while maintaining a predetermined distance from the first spring piece 710, and the first spring piece 710 and the second spring piece 720 are integrally connected to each other by a third spring piece 730, and the entire spring 700 includesIn a form ofThe weight part 500 has a symmetrical structure at the left and right sides in the longitudinal direction. This is to fix the weight part 500 and the box part 800 so that the vibration balance can be maintained uniformly.

The first spring piece 710 is fixed to the inner surface of the box part 800 by a first support part 910, and the second spring piece 720 located at the rear is fixed to the outer surface of the weight part 500 by a second support part 920.

As shown in the left side of fig. 3, the first spring piece 710 is bent from the end of the first support portion 910 to the weight portion 500 by a predetermined angle α, thereby providing a linear space S capable of linear motion.

The angle α is 5 ° or more, so that it is possible to prevent an interference phenomenon with the tank part 800 during the linear reciprocating motion of the weight part 500. That is, when the angle α is 5 ° or less, the range in which the first spring piece 710 moves around the first support part 910 becomes lower, so that the movement of the weight part 500 is extremely restricted, and the vibration amount becomes small. This is provided to ensure a sufficient resonance frequency in downsizing.

As shown in the right side of fig. 3, the first support portion 910 is formed to protrude from the upper portion of the first spring piece 710 by a predetermined height H, so that the predetermined height can be maintained when the box portion 800 is assembled.

The third spring plate 730 has a horizontal upper portion and an arched lower portion, so that smooth vibration can be achieved.

Referring to fig. 4, fig. 4 is a magnetic field distribution diagram and a magnetic field flow diagram illustrating a bracket and a tank part in the horizontal linear vibration motor according to an embodiment of the present invention.

In the present invention, the holder 100 and the box 800 are preferably made of magnetic materials forming a closed circuit.

As shown in the magnetic field distribution diagram and the magnetic field flow diagram of fig. 4, the magnetic field is distributed so as to spread from the center of the bracket 100 to both sides, the middle tank 800 is also spread from the upper portion to both sides, and the magnetic field spread in the middle is distributed and flows along the side walls of the tank 800 to the lower portion, thereby forming a closed loop, and maximizing the electromagnetic field.

Referring to fig. 5, fig. 5 is a view illustrating a distribution pattern of a non-magnetic material and a magnetic flux for a bracket and a box part in a horizontal linear vibration motor according to an embodiment of the present invention.

In the present invention, the magnetic body forming a closed circuit in the holder 100 and the box 800 is preferably made of SUS-430 of ferrite series or pure iron.

As shown in fig. 5, when a nonmagnetic material is used, (m1Point): 0.1526 Tesla (Tesla) 1526 Gauss (Gauss), and when a magnetic material is used, (m1Point):0.0047 Tesla (Tesla) 47.85 Gauss (Gauss), the shielding effect against the leakage flux is significant.

Referring to fig. 6a and 6b, fig. 6a is a cross-sectional view of a horizontal linear vibration motor according to another embodiment of the present invention, and fig. 6b is a longitudinal-sectional view of a horizontal linear vibration motor according to another embodiment of the present invention.

In the present invention, the third spring piece 730 positioned between the weight portion 500 and the tank portion 800 has a simple configuration, but in addition to this configuration, as shown in fig. 6a and 6b, the third spring piece 730 preferably includes any one of an inner damper inwardly contacting the weight portion 500 or an outer damper 732 outwardly contacting the tank portion 800. This is to enable easy control of the fall Time (Falling Time).

Referring to fig. 7a and 7b, fig. 7a and 7b are longitudinal sectional views illustrating before and after activation of a stopper (stopper) type damper in a horizontal linear vibration motor according to another embodiment of the present invention.

In the present invention, the space between the weight part 500 and the box part 800 is formed to be empty, and in addition to this, as shown in fig. 7a and 7b, stopper-type dampers 810 are preferably provided inside the right and left sides of the box part 800. At this time, a double-sided tape 811 is attached to one side surface of the inner wall of the box portion 800, a PET film 813 is attached to the other side surface of the double-sided tape 811, and a polyurethane foam 813 is provided on the PET film 812.

Although the horizontal linear vibration motor including the stopper type damper 810 does not have an influence during normal driving, when an external impact is applied, the weight portion 500 moves in the direction of the arrow shown in fig. 7b, and is buffered by the urethane foam 813 provided on the PET film during a collision with the stopper type damper 810, thereby preventing the deformation of the spring 700, forming a GAP between the coil 300 and the weight portion 500, and preventing the damage of the coil 300.

The present invention has been described above with reference to the drawings, but this is merely an example, and various substitutions, modifications, and changes may be made without departing from the technical spirit of the present invention, and the present invention is not limited to the foregoing embodiments and drawings.