High-efficiency short-axis horizontal linear vibration actuator

Abstract

This invention relates to a high-efficiency short-axis horizontal linear vibration actuator. As the markets for virtual reality (VR) and augmented reality (AR) expand beyond the mobile phone market, and as the size of the instruments used in vibration actuators in various products such as automotive electronics, home appliances, and beauty products continues to increase, this invention specifically relates to a high-efficiency short-axis horizontal linear vibration actuator capable of expressing various tactile feedback vibration effects through vibration.

Description

Technical Field

[0001] This invention relates to a high-efficiency short-axis horizontal linear vibration actuator. In response to the expanding virtual reality (VR) and augmented reality (AR) markets beyond the mobile phone market, and the increasing size of instruments used in vibration actuators in various products such as automotive electronics, home appliances, and beauty products, this invention specifically relates to a high-efficiency short-axis horizontal linear vibration actuator capable of expressing various tactile feedback vibration effects through vibration. Background Technology

[0002] Typically, in addition to the mobile phone market, vibration actuators are being used in a variety of products, including automotive electronics, home appliances, and beauty products, as the virtual reality (VR) and augmented reality (AR) markets continue to expand.

[0003] The initial model of the vibration actuator installed inside a portable communication instrument was a rotary vibration motor with a stator and rotor as its basic structure. In this rotary vibration motor, a rod is fixed on the support of the stator, and the rotor is supported and rotated on the rod to generate vibration. In order to improve the vibration force, the volume of the rotor is increased or the rotation speed is increased to improve the vibration force. However, due to structural problems, there are limitations in miniaturization, and there are great difficulties in generating high vibration. There is also the problem of not being able to ensure a lifespan of more than the specified time.

[0004] To improve the problems of rotary vibration motors, a horizontal vibration actuator type vibration motor has recently been disclosed. The disclosed horizontal vibration actuator type vibration motor includes: an upper housing and a lower housing that are connected to each other; a magnetic force generating means formed on at least one side of the upper housing and the lower housing; a magnet subjected to an attractive or repulsive force relative to the magnetic force generating means; a weight part that is integral with the magnet and moves up and down to increase the vibration force; an elastic means located on the lower part of either the upper or lower side of the weight part to elastically support the weight part; and a fixing member for fixing the other end of the elastic means to the upper housing and the lower housing.

[0005] Compared to rotary vibratory motors, this type of horizontal vibration actuator vibratory motor has a longer service life, overcomes size limitations, and can achieve a fast response speed, so it has been widely used recently. However, as the size of the instruments used with the actuator increases, it becomes difficult to express various tactile feedback vibration effects through vibration.

[0006] In addition, most horizontal vibration motors generate vibration in the long axis direction, making them difficult to install on products that require vibration in the short axis direction.

[0007] Existing technical documents

[0008] Patent documents

[0009] (Patent Document 1) Patent Publication No. 10-2010-0073301 (July 1, 2010) Summary of the Invention

[0010] Technical problems to be solved

[0011] This invention is proposed to solve the problems existing in the prior art. Its purpose is to provide a highly efficient horizontal linear vibration actuator in the short axis direction that can vibrate horizontally in the short axis direction, thereby improving the problem that most horizontal vibration motors vibrate in the long axis direction, making it difficult to install them on products that need to vibrate in the short axis direction.

[0012] Furthermore, the present invention aims to provide a highly efficient short-axis horizontal linear vibration actuator that maximizes magnetic field efficiency by minimizing leakage magnetic flux to the outside, thereby exhibiting strong vibration force and improving vibration response time.

[0013] Technical solution

[0014] To achieve the above objectives, the present invention provides a high-efficiency short-axis horizontal linear vibration actuator, which includes a bracket 10, on which a flexible printed circuit board 20, a coil 50 and a spring 60 are fixed to a bracket to shield the leakage magnetic flux.

[0015] A flexible printed circuit board 20 is mounted on the outer edge of the bracket 10, so that an external power supply is supplied to the coil 50;

[0016] The yoke 30 is fixed to the spring 60, and the yoke plate 70 and the lower magnet 40 are fixed to form a closed loop of the magnetic field generated by the magnet, thereby shielding the leakage magnetic flux.

[0017] The lower magnet 40 is fixed to the yoke 30 by a permanent magnet, generating a magnetic field that interacts with the magnetic field of the coil 50, thereby causing the vibrator to vibrate horizontally in the short axis direction.

[0018] The coil 50, mounted on the bracket 10, generates an electromagnetic field through an external signal, which interacts with the upper magnet 90 and the lower magnet 40, thereby amplifying the horizontal vibration in the short axis direction.

[0019] Spring 60, connected to the bracket 10 and yoke 30, amplifies vibration and determines the resonant frequency;

[0020] The yoke plate 70 is combined with the yoke part 30 to form a closed loop of the magnetic field generated in the magnet, thereby shielding the leakage magnetic flux and fixing the weight part 80 and the upper magnet 90.

[0021] The weight part 80 is fixed to the yoke plate 70. The weight of the weight part amplifies the vibration and determines the resonant frequency.

[0022] The upper magnet 90 is fixed to the yoke plate 70 by a permanent magnet, thereby generating a magnetic field, which interacts with the magnetic field of the coil 50, causing the vibrator to vibrate horizontally in the short axis direction.

[0023] The housing 100 forms an outer shell to protect the vibrating body and shield the leakage magnetic flux. This structure improves the electromagnetic force, maximizing the vibration force and further enhancing the intermediate vibration response time.

[0024] The yoke 30 and yoke plate 70 are provided with an assembly direction part AS. The assembly direction part AS has a first assembly protrusion 301 and a second assembly protrusion 302 at the center of the upper part on both sides of the yoke 30, and a first assembly groove 701 and a second assembly groove 702 at the center of both sides of the yoke plate 70, so as to realize the insertion and assembly of the first assembly protrusion 301 and the second assembly protrusion 302. The width of the first assembly groove 701 is larger than that of the second assembly groove 702.

[0025] Furthermore, the bracket 10 includes coil fixing plates 101 with their upper ends bent inward at both ends of the long direction of the flat plate, and spring fixing plates 102 with their upper ends bent vertically upward along the diagonal direction are provided on the sides of both ends of the long direction of the flat plate.

[0026] Furthermore, the spring 60 has contact fixing portions 601 at both ends and contact connecting portions 602 connecting the contact fixing portions 601, wherein the width of the contact fixing portions 601 is wider than the width of the contact connecting portions 602.

[0027] Furthermore, the spring 60 has a first support portion ST and a second support portion ST superimposed on the outer side of the contact fixing portion 601 at both ends, and shock absorbers DP are provided on the inner and outer sides of the contact fixing portion 601 at both ends, so that the shock absorbers DP are symmetrically arranged in the diagonal direction.

[0028] Invention Effects

[0029] Therefore, the present invention provides a high-efficiency short-axis horizontal linear vibration actuator, which improves existing products that are limited to horizontal vibration in the long axis direction to have horizontal vibration in the short axis direction, thereby expanding the range of products that can be used. With the coil in the center, magnets are placed above and below to form a closed magnetic field loop, which improves the electromagnetic force, maximizes the vibration force, and improves the vibration response time. Attached Figure Description

[0030] Figure 1 An exploded perspective view of the high-efficiency short-axis horizontal linear vibration actuator according to the present invention.

[0031] Figure 2 This is a longitudinal cross-sectional view of the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0032] Figure 3 This is an example diagram illustrating the combined state of the yoke, yoke plate, and upper and lower magnets in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0033] Figure 4 This diagram illustrates the magnetic field directionality of the yoke, yoke plate, and upper and lower magnets in the high-efficiency short-axis horizontal linear vibration actuator of the present invention, and compares the electromagnetic field distribution and leakage flux of the present invention with those of the prior art.

[0034] Figure 5 This is an enlarged schematic diagram of the support and the coil fixed on the support in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0035] Figure 6 This is an enlarged schematic diagram of the spring and the part in which the spring is provided in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0036] Figure 7 This is an enlarged schematic diagram of the portion of the high-efficiency short-axis horizontal linear vibration actuator of the present invention that includes a spring.

[0037] Figure 8 A schematic diagram showing the response characteristics of a conventional long-axis horizontal vibration motor compared to the present invention is presented in the efficient short-axis horizontal linear vibration actuator of the present invention.

[0038] Explanation of reference numerals in the attached figures

[0039] 10: Support bracket; 20: Flexible printed circuit board

[0040] 30: Yoke 40: Lower magnet

[0041] 50: Coil; 60: Spring

[0042] 70: Yoke plate 80: Weight section

[0043] 90: Upper magnet; 100: Box section Detailed Implementation

[0044] The present invention can be modified in various ways and has many embodiments. Specific embodiments will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to these specific embodiments. It should be understood that the present invention includes all modifications, equivalents, and even substitutions that have the spirit and technical scope of the present invention.

[0045] To enable those skilled in the art to understand the invention in more detail, embodiments of the invention are provided. Therefore, the forms of the various elements shown in the accompanying drawings may be exaggerated for clarity, and detailed descriptions of relevant prior art will be omitted when it is believed that such descriptions would obscure the spirit of the invention.

[0046] The terms "first," "second," etc., can be used when describing multiple constituent elements, but these constituent elements cannot be limited to these terms. Terms are merely used to distinguish one constituent element from others.

[0047] The terminology used in this invention is for illustrative purposes only and is not intended to limit the invention. Singular expressions, unless otherwise expressly indicated in the text, include the plural meaning.

[0048] In this invention, terms such as "comprising" or "having" are used to indicate the presence of features, numbers, steps, actions, constituent elements, components or combinations thereof described in the specification, and should be understood not to preclude the presence or additional possibilities of one or more other features or numbers, steps, actions, constituent elements, components or combinations thereof.

[0049] First, the present invention relates to a high-efficiency short-axis horizontal linear vibration actuator, comprising at least one of a bracket 10, a flexible printed circuit board 20, a yoke 30, a lower magnet 40, a coil 50, a spring 60, a yoke plate 70, a weight part 80, an upper magnet 90, and a housing part 100.

[0050] The preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings.

[0051] See Figure 1 and Figure 2 , Figure 1 An exploded perspective view of the high-efficiency short-axis horizontal linear vibration actuator according to the present invention. Figure 2 This is a longitudinal cross-sectional view of the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0052] According to the present invention, a flexible printed circuit board 20, a coil 50 and a spring 60 are fixed on a bracket 10 having a housing and shielding the leakage magnetic flux. The flexible printed circuit board 20 is mounted on the outer edge of the bracket 10 to prevent interference and to allow external power to be supplied to the coil 50.

[0053] Furthermore, the yoke 30 is fixed to the spring 60, and the yoke plate 70 and lower magnet 40 are fixed to form a closed loop of the magnetic field generated by the magnet, thereby shielding the leakage magnetic flux. The lower magnet 40 is made of a permanent magnet and is fixed to the yoke 30, generating a magnetic field that interacts with the magnetic field of the coil 50, thereby causing the vibrating body to vibrate horizontally in the short axis direction. At this time, the yoke 30 is bent vertically at both ends of the flat plate to form... The shape of the magnet encloses the space part SP.

[0054] Furthermore, the coil 50 is mounted on the support 10 and generates an electromagnetic field through an external signal, which interacts with the upper magnet 90 and the lower magnet 40, thereby amplifying the horizontal vibration in the short axis direction. The spring 60 is connected to the support 10 and the yoke 30, thereby amplifying the vibration and determining the resonant frequency.

[0055] The yoke plate 70 is combined with the yoke portion 30 to form a closed loop of the magnetic field generated in the magnet, thereby shielding the leakage magnetic flux and fixing the weight portion 80 and the upper magnet 90. The weight portion 80 is fixed to the yoke plate 70, and the weight of the weight portion amplifies the vibration, thus determining the resonant frequency.

[0056] The upper magnet 90 is made of a permanent magnet and is fixed to the yoke plate 70, thereby generating a magnetic field. This magnetic field interacts with the magnetic field of the coil 50, causing the vibrator to vibrate horizontally in the short axis direction. The box part 100 forms a shell to protect the vibrator and shield the leakage magnetic flux.

[0057] See Figure 3 , Figure 3 This is an example diagram illustrating the combined state of the yoke, yoke plate, and upper and lower magnets in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0058] According to the present invention, the high-efficiency short-axis horizontal linear vibration actuator is provided with an assembly direction part AS on the yoke 30 and the yoke plate 70, thereby preventing reverse assembly during the assembly process, making it easy to identify and improving the accuracy of assembly.

[0059] The assembly direction part AS has a first assembly protrusion 301 and a second assembly protrusion 302 provided at the center of the upper part on both sides of the yoke 30, and a first assembly groove 701 and a second assembly groove 702 provided at the center of both sides of the yoke plate 70, so that assembly can be easily performed. The first assembly groove 701 is wider than the second assembly groove 702, so as to prevent reverse assembly.

[0060] See Figure 4 , Figure 4 This diagram illustrates the magnetic field directionality of the yoke, yoke plate, and upper and lower magnets in the high-efficiency short-axis horizontal linear vibration actuator of the present invention, and compares the electromagnetic field distribution and leakage flux of the present invention with those of the prior art.

[0061] In the high-efficiency short-axis horizontal linear vibration actuator of the present invention, the lower magnet 40 and the upper magnet 90 are composed of multi-stage magnetized magnets arranged vertically. Since the magnets adopt a structure wrapped by the yoke 30 and the yoke plate 70, a closed loop of magnetic field is formed, which minimizes the leakage flux and maximizes the electromagnetic force.

[0062] The comparison of electromagnetic field forces in the vibration direction according to the present invention shows that the electromagnetic field force of the prior art is 0.032N, while the electromagnetic field force of the high-efficiency short-axis horizontal linear vibration actuator of the present invention is 0.394N, which is more than 12 times higher.

[0063] Furthermore, the results of comparing the leakage magnetic flux are as follows: the leakage magnetic flux of the high-efficiency short-axis horizontal linear vibration actuator of the present invention is 11.26 mT, while the leakage magnetic flux of the existing structure is 160.6 mT. Compared with the existing structure, the leakage magnetic flux is more than 14 times smaller.

[0064] See Figure 5 , Figure 5 This is an enlarged schematic diagram of the support and the coil fixed on the support in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0065] The bracket 10 of the high-efficiency short-axis horizontal linear vibration actuator according to the present invention includes upper ends that are bent upward and inward at both ends of the long direction in a flat plate shape. The coil fixing piece 101 is curved in shape.

[0066] The bracket 10 has spring-loaded retaining plates 102 that bend vertically upwards along the diagonal direction on the sides of both ends of the flat plate. Preferably, an insulator IS is inserted between the bracket 10 and the coil 50 to facilitate insulation during assembly or use.

[0067] See Figure 6 , Figure 6This is an enlarged schematic diagram of the spring and the part in which the spring is provided in the high-efficiency short-axis horizontal linear vibration actuator of the present invention.

[0068] The spring 60 of the high-efficiency short-axis horizontal linear vibration actuator according to the present invention includes contact fixing portions 601 at both ends and contact connecting portions 602 connecting the contact fixing portions 601. Preferably, the width of the contact fixing portions 601 is wider than the width of the contact connecting portions 602. In this case, the contact connecting portions 602 have... and It can be any of the forms in the equation, thereby enabling the adjustment of the resonant frequency.

[0069] See Figure 7 , Figure 7 This is an enlarged schematic diagram of the portion of the high-efficiency short-axis horizontal linear vibration actuator of the present invention that includes a spring.

[0070] The spring 60 of the high-efficiency short-axis horizontal linear vibration actuator according to the present invention has a first support portion and a second support portion ST superimposed on the outer side of the contact fixing portion 601 at both ends, so that the spring 60 can be more firmly supported during the fixing process, thereby improving the durability against deformation and damage.

[0071] Furthermore, when the spring 60 is provided with shock absorbers DP on the inner and outer sides of the contact fixing part 601 at both ends, it is preferable to arrange the shock absorbers DP symmetrically in a diagonal direction. When more than one is added, the vibration force and response speed can be improved.

[0072] See Figure 8 , Figure 8 A schematic diagram showing the response characteristics of a conventional long-axis horizontal vibration motor compared to the present invention is presented in the efficient short-axis horizontal linear vibration actuator of the present invention.

[0073] like Figure 8 As shown, the response characteristics of the high-efficiency short-axis horizontal linear vibration actuator of the present invention are improved by more than 3.5 times compared with the existing long-axis horizontal vibration motor. In order to further improve this response characteristic, a magnetofluid can be used.

[0074] The present invention has been described above based on the accompanying drawings, but this is merely illustrative. Various substitutions, modifications and alterations can be made without departing from the technical concept of the present invention, and it is not limited to the foregoing embodiments and drawings.

Claims

1. A high-efficiency horizontal linear vibration actuator in a short-axis direction, comprising a bracket (10) on which a flexible printed circuit board (20), a coil (50), and a spring (60) are fixed so that leakage magnetic flux is shielded; a yoke portion (30) fixed to the spring (60), a fixed yoke plate (70), and a lower magnet (40) are fixed so that a closed loop of a magnetic field generated by the magnet is formed, thereby causing leakage magnetic flux to be shielded; the lower magnet (40) is fixed to the yoke portion (30) by a permanent magnet, generates a magnetic field, and acts on a magnetic field of the coil (50), thereby causing a vibration body to generate horizontal vibration in a short-axis direction; the spring (60) is connected to the bracket (10) and the yoke portion (30), thereby amplifying vibration and determining a resonance frequency; the yoke plate (70) is combined with the yoke portion (30), thereby forming a closed loop of a magnetic field generated by the magnet, causing leakage magnetic flux to be shielded, and fixing a weight portion (80) and an upper magnet (90); the weight portion (80) is fixed to the yoke plate (70), and amplifies vibration using a weight of the weight portion, thereby determining a resonance frequency; the upper magnet (90) is fixed to the yoke plate (70) by a permanent magnet, thereby generating a magnetic field and acting on a magnetic field of the coil (50), thereby causing a vibration body to generate horizontal vibration in a short-axis direction; and a box portion (100) forms an outer case to protect the vibration body, thereby causing leakage magnetic flux to be shielded, characterized in that: the yoke portion (30) and the yoke plate (70) are provided with an assembly direction portion (AS), the assembly direction portion (AS) is provided with a first assembly protrusion (301) and a second assembly protrusion (302) at a central portion of an upper portion on both sides of the yoke portion (30), and is provided with a first assembly groove (701) and a second assembly groove (702) at central portions of both sides of the yoke plate (70), the first assembly protrusion (301) and the second assembly protrusion (302) are inserted and assembled, and a width of the first assembly groove (701) is greater than a width of the second assembly groove (702); the bracket (10) includes a coil fixing piece (101) that is bent upward toward an inner side of an upper portion at each of both ends in a long direction of a flat plate shape, and is provided with a spring fixing piece (102) that is bent vertically upward along a diagonal direction at a side surface of each of both ends in the long direction of the flat plate shape; and the spring (60) has a contact fixing portion (601) at each of both ends and a contact connecting portion (602) that connects between the contact fixing portions (601), and a width of the contact fixing portion (601) is greater than a width of the contact connecting portion (602).

2. The high-efficiency horizontal linear vibration actuator in a short-axis direction according to claim 1, characterized in that: the spring (60) is provided with a first support portion (ST) and a second support portion (ST) that are stacked at an outer side of the contact fixing portion (601) at each of both ends, a damper (DP) is provided at an inner side and an outer side of the contact fixing portion (601) at each of both ends, and the dampers (DP) are symmetrically provided in a diagonal direction. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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