CN107808995B - wearable communication device - Google Patents

wearable communication device Download PDF

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Publication number
CN107808995B
CN107808995B CN201610809440.0A CN201610809440A CN107808995B CN 107808995 B CN107808995 B CN 107808995B CN 201610809440 A CN201610809440 A CN 201610809440A CN 107808995 B CN107808995 B CN 107808995B
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antenna element
communication device
wearable communication
frequency band
tongue
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CN107808995A (en
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颜铭庆
张琨盛
王传骏
林敬基
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Acer Inc
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Acer Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/273—Adaptation for carrying or wearing by persons or animals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors

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Abstract

The invention provides a wearable communication device, which comprises a shoe body structure, a grounding element and an antenna element. The shoe body structure includes a tongue. The grounding element is disposed on the tongue. An antenna element is disposed on the tongue and adjacent an edge of the ground element. The antenna element operates in a first frequency band and the length of the ground element is no less than 1/4 wavelengths of the lowest frequency of the first frequency band.

Description

穿戴式通信装置wearable communication device

技术领域technical field

本发明涉及一种通信装置，尤其涉及一种穿戴式通信装置。The present invention relates to a communication device, in particular to a wearable communication device.

背景技术Background technique

随着移动通信技术的快速发展，各个国际大厂已经开始陆续进行穿戴式通信装置(wearable communication device)的开发。例如，随着路跑风气的盛行以及居家、健康与儿童照护的发展，智慧鞋(smart shoes)近年来逐渐受到瞩目，并可用于管控人们的定位资讯、生理参数以及路跑资讯等。穿戴式通信装置的整体环境(例如：外观设计、天线空间、接地面尺寸以及天线周围环境)与目前的手持式装置相去甚远，因此穿戴式通信装置在天线设计上也必须有不一样的设计思维与应用技术。With the rapid development of mobile communication technology, various international manufacturers have started to develop wearable communication devices one after another. For example, with the popularity of road running and the development of home, health and child care, smart shoes have gradually attracted attention in recent years, and can be used to control people's positioning information, physiological parameters, and road running information. The overall environment of wearable communication devices (such as: appearance design, antenna space, ground plane size, and the surrounding environment of the antenna) is far from the current handheld devices, so wearable communication devices must also have a different antenna design. Thinking and Applied Technology.

以智慧鞋为例来看，现有的智慧鞋大多是直接采用模块化天线，并将模块化天线与接地面一同设置在鞋底或是鞋垫中。然而，上述做法只着重在智慧鞋的系统整合，而忽略了人体对于天线元件所造成的影响。因此，现有的智慧鞋的通信品质往往不佳，甚至会出现定位失真或失效的状况。Taking smart shoes as an example, most of the existing smart shoes directly use modular antennas, and the modular antennas are arranged in the sole or insole together with the ground plane. However, the above approach only focuses on the system integration of smart shoes, ignoring the influence of the human body on the antenna elements. Therefore, the communication quality of the existing smart shoes is often poor, and even positioning distortion or failure may occur.

发明内容SUMMARY OF THE INVENTION

本发明提供一种穿戴式通信装置，包括设置在鞋体结构的鞋舌内的接地元件与天线元件，从而有助于提升穿戴式通信装置的通信品质。The present invention provides a wearable communication device, which includes a ground element and an antenna element arranged in a shoe tongue of a shoe body structure, thereby helping to improve the communication quality of the wearable communication device.

本发明的穿戴式通信装置，包括鞋体结构、接地元件与天线元件。鞋体结构包括鞋舌。接地元件设置在鞋舌。天线元件设置在鞋舌，并邻近接地元件的一边缘。此外，天线元件操作在第一频段，且接地元件的长度不小于第一频段的最低频率的1/4波长。The wearable communication device of the present invention includes a shoe body structure, a grounding element and an antenna element. The body structure includes a tongue. The grounding element is provided on the tongue. The antenna element is disposed on the tongue, adjacent to an edge of the ground element. In addition, the antenna element operates in the first frequency band, and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band.

在本发明的一实施例中，上述的天线元件与接地元件设置在基板上，且基板埋设在鞋舌内。In an embodiment of the present invention, the above-mentioned antenna element and grounding element are disposed on a substrate, and the substrate is embedded in the shoe tongue.

基于上述，本发明的穿戴式通信装置包括鞋体结构，且接地元件与天线元件是设置在鞋体结构的鞋舌。因此，将有效地降低周遭环境或是人体对天线元件与接地元件所造成的影响，从而有助于提升穿戴式通信装置的通信品质。Based on the above, the wearable communication device of the present invention includes a shoe body structure, and the ground element and the antenna element are disposed on the shoe tongue of the shoe body structure. Therefore, the influence of the surrounding environment or the human body on the antenna element and the ground element will be effectively reduced, thereby helping to improve the communication quality of the wearable communication device.

附图说明Description of drawings

图1是依据本发明一实施例的穿戴式通信装置的示意图。FIG. 1 is a schematic diagram of a wearable communication device according to an embodiment of the present invention.

图2与图3分别是依据本发明一实施例的天线元件的示意图。FIG. 2 and FIG. 3 are schematic diagrams of an antenna element according to an embodiment of the present invention, respectively.

图4是依据本发明一实施例的穿戴式通信装置在未放入人体组织模拟液时的天线元件的返回损失图。4 is a graph of the return loss of the antenna element of the wearable communication device according to an embodiment of the present invention when no human tissue simulant is placed.

图5是依据本发明一实施例的穿戴式通信装置在放入人体组织模拟液时的天线元件的返回损失图。5 is a graph of the return loss of the antenna element when the wearable communication device is placed in a human tissue simulant according to an embodiment of the present invention.

图6是依据本发明一实施例的天线元件的辐射效率图。FIG. 6 is a radiation efficiency diagram of an antenna element according to an embodiment of the present invention.

附图标记说明：Description of reference numbers:

100：穿戴式通信装置 110：鞋体结构100: Wearable Communication Device 110: Shoe Body Structure

111：鞋舌 112：鞋身111: Tongue 112: Body

113：鞋头 114：鞋带孔113: Toe cap 114: Lace hole

115：鞋口 120：天线元件115: Shoe mouth 120: Antenna element

130：接地元件 140：基板130: Grounding element 140: Substrate

150：射频电路 160：电池150: RF Circuits 160: Batteries

210：第一辐射部 220：馈入部210: first radiating part 220: feeding part

230：第二辐射部 201：边长230: Second radiating part 201: Side length

FP2：馈入点 310：第一部分FP2: Feed Point 310: Part 1

320：第二部分 330：闭槽孔320: Part Two 330: Closed Slotted Holes

SD31：第一边缘 SD32：第二边缘SD31: First edge SD32: Second edge

610、620：曲线610, 620: Curve

具体实施方式Detailed ways

为使本发明的上述特征和优点能更明显易懂，下文特举实施例，并配合所附图作详细说明如下。In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, the following embodiments are given and described in detail with the accompanying drawings as follows.

图1是依据本发明一实施例的穿戴式通信装置的示意图。如图1所示，穿戴式通信装置100可例如是一智慧鞋。具体而言，穿戴式通信装置100包括鞋体结构110，且鞋体结构110包括鞋舌111、鞋身112、鞋头113、鞋带孔114以及鞋口115。此外，穿戴式通信装置100还包括天线元件120以及接地元件130。FIG. 1 is a schematic diagram of a wearable communication device according to an embodiment of the present invention. As shown in FIG. 1 , the wearable communication device 100 can be, for example, a smart shoe. Specifically, the wearable communication device 100 includes a shoe body structure 110 , and the shoe body structure 110 includes a shoe tongue 111 , a shoe body 112 , a toe cap 113 , a shoelace hole 114 and a shoe mouth 115 . In addition, the wearable communication device 100 further includes an antenna element 120 and a ground element 130 .

天线元件120与接地元件130是设置在鞋舌111，且天线元件120邻近接地元件130的一边缘。举例来说，穿戴式通信装置100还包括基板140。天线元件120与接地元件130设置在基板140的一表面上，且基板140可埋设在鞋舌111内。换言之，天线元件120、接地元件130与基板140可设置在鞋舌111的夹层空间内。此外，基板140可例如是一软性印刷电路板，并可顺应人体的足部的表面进行弯折，从而致使鞋舌111可贴附在人体的足部的表面上。The antenna element 120 and the ground element 130 are disposed on the tongue 111 , and the antenna element 120 is adjacent to an edge of the ground element 130 . For example, the wearable communication device 100 further includes a substrate 140 . The antenna element 120 and the ground element 130 are disposed on a surface of the substrate 140 , and the substrate 140 can be embedded in the shoe tongue 111 . In other words, the antenna element 120 , the ground element 130 and the substrate 140 may be disposed in the interlayer space of the shoe tongue 111 . In addition, the substrate 140 can be, for example, a flexible printed circuit board, and can be bent to conform to the surface of the foot of the human body, so that the tongue 111 can be attached to the surface of the foot of the human body.

天线元件120可操作在第一频段，且接地元件130的长度不小于(也即，大于或是等于)第一频段的最低频率的1/4波长。因此，将有助于天线元件120的微型化。此外。当使用者穿上穿戴式通信装置100时，鞋舌111是位于人体的足部的上方，也即人体的足部不会遮蔽到设置在鞋舌111内的天线元件120与接地元件130。因此，将可避免天线元件120与接地元件130受到人体的影响，也即将可降低周遭环境对天线元件120与接地元件130所造成的影响，从而有助于提升穿戴式通信装置100的通信品质。The antenna element 120 can operate in the first frequency band, and the length of the ground element 130 is not less than (ie, greater than or equal to) 1/4 wavelength of the lowest frequency of the first frequency band. Therefore, miniaturization of the antenna element 120 will be facilitated. also. When the user wears the wearable communication device 100 , the tongue 111 is located above the foot of the human body, that is, the foot of the human body is not shielded from the antenna element 120 and the grounding element 130 disposed in the tongue 111 . Therefore, the influence of the human body on the antenna element 120 and the ground element 130 can be avoided, and the influence of the surrounding environment on the antenna element 120 and the ground element 130 can be reduced, thereby helping to improve the communication quality of the wearable communication device 100 .

举例来说，天线元件120所涵盖的第一频段可例如是，全球定位系统(globalpositioning system，简称GPS)所使用的1.57542GHz频段。此外，设置在鞋舌111内的天线元件120，将有利于穿戴式通信装置100接收来自天空中GPS的卫星信号，从而可避免穿戴式通信装置100出现定位失真或失效的状况。再者，设置在鞋舌111内的天线元件120与接地元件130也不容易受到周遭环境的影响，从而可提升穿戴式通信装置100的通信品质的稳定性。相对地，随着通信品质的稳定性的提升，穿戴式通信装置100将无须额外设置匹配电路或是匹配元件，从而有助于降低穿戴式通信装置100的生产成本。For example, the first frequency band covered by the antenna element 120 may be, for example, the 1.57542 GHz frequency band used by a global positioning system (GPS for short). In addition, the antenna element 120 disposed in the shoe tongue 111 will facilitate the wearable communication device 100 to receive satellite signals from GPS in the sky, thereby preventing the wearable communication device 100 from experiencing positioning distortion or failure. Furthermore, the antenna element 120 and the grounding element 130 disposed in the shoe tongue 111 are not easily affected by the surrounding environment, so that the stability of the communication quality of the wearable communication device 100 can be improved. In contrast, with the improvement of the stability of the communication quality, the wearable communication device 100 does not need to provide additional matching circuits or matching elements, thereby helping to reduce the production cost of the wearable communication device 100 .

更进一步来看，穿戴式通信装置100还包括射频电路150与电池160。其中，射频电路150与电池160设置在基板140上。也即，射频电路150与电池160也可设置在鞋舌111的夹层空间内。此外，射频电路150可通过同轴缆线电性连接至天线元件120的馈入点，以提供信号至天线元件120或是接收来自天线元件120的信号。电池160可用于提供穿戴式通信装置100所需的电力。例如，电池160可提供操作电压至射频电路150。Looking further, the wearable communication device 100 further includes a radio frequency circuit 150 and a battery 160 . The radio frequency circuit 150 and the battery 160 are disposed on the substrate 140 . That is, the radio frequency circuit 150 and the battery 160 can also be disposed in the interlayer space of the shoe tongue 111 . In addition, the radio frequency circuit 150 can be electrically connected to the feeding point of the antenna element 120 through a coaxial cable, so as to provide a signal to the antenna element 120 or receive a signal from the antenna element 120 . The battery 160 may be used to provide power required by the wearable communication device 100 . For example, the battery 160 may provide the operating voltage to the radio frequency circuit 150 .

图2与图3分别是依据本发明一实施例的天线元件的示意图，且以下将参照图2与图3进一步说明天线元件120的结构与操作。如图2与图3所示，天线元件120包括第一辐射部210、馈入部220与第二辐射部230。其中，馈入部220的第一端具有馈入点FP2，且馈入部220的第二端电性连接第一辐射部210。2 and FIG. 3 are schematic diagrams of an antenna element according to an embodiment of the present invention, respectively, and the structure and operation of the antenna element 120 will be further described below with reference to FIGS. 2 and 3 . As shown in FIGS. 2 and 3 , the antenna element 120 includes a first radiating part 210 , a feeding part 220 and a second radiating part 230 . The first end of the feeding portion 220 has a feeding point FP2 , and the second end of the feeding portion 220 is electrically connected to the first radiation portion 210 .

值得一提的是，馈入部220与第一辐射部210可形成贴片天线(patch antenna)结构，且天线元件120可通过贴片天线结构操作在第一频段。具体而言，第一辐射部210可例如是一方形金属片。此外，由于接地元件130的长度不小于第一频段的最低频率的1/4波长，因此第一辐射部210(也即，方形金属片)的边长201可小于第一频段的最低频率的1/2波长，从而有助于天线元件120的微型化。例如，在一实施例中，第一辐射部210(也即，方形金属片)的边长201可约为第一频段的最低频率的1/6至1/8波长。举例而言，第一频段可例如是1.57542 GHz频段，且第一辐射部210(也即，方形金属片)的边长201可例如是23毫米(mm)。It is worth mentioning that the feeding part 220 and the first radiating part 210 can form a patch antenna structure, and the antenna element 120 can operate in the first frequency band through the patch antenna structure. Specifically, the first radiation portion 210 can be, for example, a square metal sheet. In addition, since the length of the grounding element 130 is not less than 1/4 wavelength of the lowest frequency of the first frequency band, the side length 201 of the first radiation part 210 (ie, the square metal sheet) may be less than 1/4 of the lowest frequency of the first frequency band /2 wavelength, thereby contributing to the miniaturization of the antenna element 120 . For example, in one embodiment, the side length 201 of the first radiation portion 210 (ie, the square metal sheet) may be approximately 1/6 to 1/8 wavelength of the lowest frequency of the first frequency band. For example, the first frequency band may be, for example, the 1.57542 GHz frequency band, and the side length 201 of the first radiation portion 210 (ie, the square metal sheet) may be, for example, 23 millimeters (mm).

请继续参照图3，第一辐射部210(也即，方形金属片)包括电性相连的第一部分310与第二部分320。也即，第一辐射部210(也即，方形金属片)可基于馈入部220划分成第一部分310与第二部分320。其中，第一部分310包括相邻的第一边缘SD31与第二边缘SD32。第一部分310的第一边缘SD31电性连接馈入部220的第二端，且第一部分310的第二边缘SD32电性连接第二辐射部230的第一端。此外，第二辐射部230的第二端电性连接馈入部220，且第二辐射部230环绕第一部分310的第一边缘SD31与第二边缘SD32。Please continue to refer to FIG. 3 , the first radiation portion 210 (ie, the square metal sheet) includes a first portion 310 and a second portion 320 that are electrically connected. That is, the first radiation part 210 (ie, the square metal sheet) may be divided into the first part 310 and the second part 320 based on the feeding part 220 . The first portion 310 includes adjacent first edges SD31 and second edges SD32. The first edge SD31 of the first portion 310 is electrically connected to the second end of the feeding portion 220 , and the second edge SD32 of the first portion 310 is electrically connected to the first end of the second radiation portion 230 . In addition, the second end of the second radiating portion 230 is electrically connected to the feeding portion 220 , and the second radiating portion 230 surrounds the first edge SD31 and the second edge SD32 of the first portion 310 .

因此，如图3所示，第二辐射部230、第一部分310与馈入部220将可形成环形天线(loop antenna)结构，且天线元件120可通过环形天线结构操作在第二频段，例如：2.45GHz频段。具体而言，第二辐射部230、第一部分310与馈入部220可形成一闭槽孔330，且闭槽孔330的周长约为第二频段的最低频率的1/2波长。此外，第二辐射部230可例如是一C字形金属片，以此环绕第一部分310的第一边缘SD31与第二边缘SD32。Therefore, as shown in FIG. 3 , the second radiating part 230 , the first part 310 and the feeding part 220 can form a loop antenna structure, and the antenna element 120 can operate in the second frequency band through the loop antenna structure, for example: 2.45 GHz band. Specifically, the second radiating portion 230 , the first portion 310 and the feeding portion 220 may form a closed slot 330 , and the perimeter of the closed slot 330 is about 1/2 wavelength of the lowest frequency of the second frequency band. In addition, the second radiation portion 230 may be, for example, a C-shaped metal sheet, so as to surround the first edge SD31 and the second edge SD32 of the first portion 310 .

图4是依据本发明一实施例的穿戴式通信装置在未放入人体组织模拟液时的天线元件的返回损失图，且图5是依据本发明一实施例的穿戴式通信装置在放入人体组织模拟液时的天线元件的返回损失图。如图4与图5所示，在未放置以及放置人体组织模拟液的情况下，天线元件120的频率范围皆可涵盖1.57GHz以及2.4GHz～2.5GHz。此外，图6是依据本发明一实施例的天线元件的辐射效率图，其中曲线610为在未放入人体组织模拟液时的天线元件120的辐射效率，且曲线620为在放入人体组织模拟液时的天线元件120的辐射效率。FIG. 4 is a diagram of the return loss of the antenna element of the wearable communication device according to an embodiment of the present invention when the body tissue simulant is not placed, and FIG. 5 is a graph of the wearable communication device according to an embodiment of the present invention placed in the human body Return loss plot of the antenna element when tissue simulant. As shown in FIG. 4 and FIG. 5 , the frequency range of the antenna element 120 can cover both 1.57 GHz and 2.4 GHz˜2.5 GHz when the human tissue simulating liquid is not placed or placed. In addition, FIG. 6 is a radiation efficiency diagram of an antenna element according to an embodiment of the present invention, wherein the curve 610 is the radiation efficiency of the antenna element 120 when the human tissue simulation solution is not placed, and the curve 620 is the radiation efficiency of the antenna element 120 when the human tissue simulation solution is placed in it. Radiation efficiency of the antenna element 120 in liquid state.

如图6所示，相较于在未放入人体组织模拟液的情况来看，当穿戴式通信装置100放入人体组织模拟液时，天线元件120的辐射效率的下降幅度小于1dB。换言之，将天线元件120与接地元件130设置在鞋舌111内，可有效地降低周遭环境或是人体对天线元件120与接地元件130所造成的影响。因此，即使是在放入人体组织模拟液的情况下，天线元件120依旧可保有良好的辐射效率，从而有助于提升穿戴式通信装置100的通信品质。As shown in FIG. 6 , when the wearable communication device 100 is placed in the human tissue simulating fluid, the radiation efficiency of the antenna element 120 decreases by less than 1 dB compared to the case where the human tissue simulating fluid is not placed. In other words, disposing the antenna element 120 and the ground element 130 in the shoe tongue 111 can effectively reduce the influence of the surrounding environment or the human body on the antenna element 120 and the ground element 130 . Therefore, the antenna element 120 can still maintain good radiation efficiency even when the human tissue simulant is put in, thereby helping to improve the communication quality of the wearable communication device 100 .

综上所述，本发明的穿戴式通信装置包括鞋体结构，且天线元件与接地元件是一同设置在鞋体结构的鞋舌。因此，将有效地降低周遭环境或是人体对天线元件与接地元件所造成的影响，从而有助于提升穿戴式通信装置的通信品质。此外，天线元件可操作在第一频段，且接地元件的长度不小于第一频段的最低频率的1/4波长。因此，将有助于天线元件的微型化。To sum up, the wearable communication device of the present invention includes a shoe body structure, and the antenna element and the grounding element are disposed together on the shoe tongue of the shoe body structure. Therefore, the influence of the surrounding environment or the human body on the antenna element and the ground element will be effectively reduced, thereby helping to improve the communication quality of the wearable communication device. In addition, the antenna element can operate in the first frequency band, and the length of the ground element is not less than 1/4 wavelength of the lowest frequency of the first frequency band. Therefore, miniaturization of the antenna element will be facilitated.

虽然本发明已以实施例揭露如上，然其并非用于限定本发明，任何所属技术领域中具有通常知识者，在不脱离本发明的精神和范围内，当可作些许的更动与润饰，故本发明的保护范围当视权利要求书所界定者为准。Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the definition of the claims.

Claims (7)

1. A wearable communication device, comprising:
a shoe body structure comprising a tongue;
a grounding element disposed on the tongue;
an antenna element disposed on the tongue adjacent an edge of the grounding element, wherein the antenna element operates in a first frequency band and the length of the grounding element is not less than the 1/4 wavelength of the lowest frequency of the first frequency band;
the antenna element includes:
a first radiation part;
a feed-in part, a first end of which has a feed-in point, and a second end of which is electrically connected to the first radiating part, wherein the feed-in part and the first radiating part form a patch antenna structure, and the antenna element operates in the first frequency band through the patch antenna structure;
the first radiating portion is a square metal sheet, the square metal sheet includes a first portion and a second portion electrically connected to each other, a first edge of the first portion is electrically connected to the second end of the feeding portion, and the antenna element further includes:
a second radiating portion, a first end of which is electrically connected to a second edge of the first portion, a second end of which is electrically connected to the feeding portion, and the second radiating portion surrounds the first edge and the second edge of the first portion, wherein the second radiating portion, the first portion and the feeding portion form a loop antenna structure, and the antenna element operates in a second frequency band through the loop antenna structure.
2. The wearable communication device of claim 1, wherein the antenna element and the ground element are disposed on a substrate, and wherein the substrate is embedded in the tongue.
3. The wearable communication device of claim 2, further comprising:
a radio frequency circuit disposed on the substrate and providing a feed signal to the antenna element.
4. The wearable communication device of claim 3, further comprising a battery disposed on the substrate and providing an operating voltage to the RF circuit.
5. The wearable communication device of claim 1, wherein the side length of the square metal sheet is 1/6-1/8 wavelengths of the lowest frequency of the first frequency band.
6. The wearable communication device of claim 1, wherein the loop antenna structure comprises a closed slot, and a perimeter of the closed slot is 1/2 wavelengths at a lowest frequency of the second frequency band.
7. The wearable communication device of claim 1, wherein the second radiating portion is a C-shaped metal sheet.
CN201610809440.0A 2016-09-08 2016-09-08 wearable communication device Active CN107808995B (en)

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CN2560106Y (en) * 2002-07-05 2003-07-09 泓越科技股份有限公司 Sheet antenna
US6788200B1 (en) * 2002-10-21 2004-09-07 Mitchell W Jamel Footwear with GPS
CN2843122Y (en) * 2005-11-30 2006-12-06 李本亮 A kind of sport footwear that receives command signal
CN201008021Y (en) * 2007-01-23 2008-01-16 富港电子（东莞）有限公司 Planar antenna
TWI388088B (en) * 2007-11-22 2013-03-01 Htc Corp Antenna device
CN201976835U (en) * 2011-03-29 2011-09-21 李繁林 Anti-lost shoes
US9578926B2 (en) * 2012-12-17 2017-02-28 Vibralabs Incorporated Device for automatically tightening and loosening laces
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