CN105277266A - Weighing scale device for measuring height through sound wave transmission and wireless communication - Google Patents
Weighing scale device for measuring height through sound wave transmission and wireless communication Download PDFInfo
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Abstract
通过声波传输和无线通信测量身高的体重秤设备，包括家用体重秤和智能设备，智能设备和家用体重秤之间通过单向声波传输方式或双向声波传输方式测量身高；单向声波传输方式，智能设备内置有第一声波发送模块，家用体重秤内置有第一声波接收模块，家用体重秤与智能设备之间无线通信连接，时间间隔T1减去系统响应时间ST1得到声波的传播时间，测量身高为声波的传播时间乘以声波的波速；双向声波传输方式，智能设备内置有第一声波发送模块和第二声波接收模块，家用体重秤内置有第一声波接收模块和第二声波发送模块，声波的总传播时间为时间间隔T2减去系统响应时间ST2，测量身高为声波的总传播时间乘以声波的波速再除以2。
Weight scale equipment that measures height through sound wave transmission and wireless communication, including household weight scales and smart devices, and height is measured between smart devices and household weight scales through one-way sound wave transmission or two-way sound wave transmission; one-way sound wave transmission, smart The device has a built-in first sound wave sending module, and the home scale has a built-in first sound wave receiving module. There is a wireless communication connection between the home scale and the smart device. The time interval T1 is subtracted from the system response time ST1 to obtain the propagation time of the sound wave, and the measurement The height is the propagation time of the sound wave multiplied by the wave speed of the sound wave; the two-way sound wave transmission method, the smart device has a built-in first sound wave sending module and a second sound wave receiving module, and the home scale has a built-in first sound wave receiving module and a second sound wave sending module module, the total propagation time of the sound wave is the time interval T2 minus the system response time ST2, and the measured height is the total propagation time of the sound wave multiplied by the wave velocity of the sound wave and divided by 2.
Description
技术领域 technical field
本发明涉及一种可以测量身高的体重秤设备。 The invention relates to a weight scale device capable of measuring height.
背景技术 Background technique
目前可以测量身高和体重的一体式体重秤常见于公共场所，这种一体式体重秤体积大重量沉，不方便移动以及家用，限制了其应用范围。家用体重秤为平板式，体积小巧、美观、使用方便，但是不能提供测量身高的功能，因此测量身高往往都是去公共场所，比较不便利。 At present, integrated weighing scales capable of measuring height and weight are commonly found in public places. Such integrated weighing scales are large in size and heavy in weight, making it inconvenient to move and use at home, which limits its application range. Household weighing scales are flat-panel, compact, beautiful, and easy to use, but they cannot provide the function of measuring height, so height measurement is often done in public places, which is inconvenient.
发明内容 Contents of the invention
本发明针对现有技术中的上述不足，提供一种采用家用体重秤、通过声波传输和无线通信方式测量身高、使用方便、成本降低的体重秤设备。 The present invention aims at the above-mentioned deficiencies in the prior art, and provides a weight scale device that adopts a household weight scale, measures height through sound wave transmission and wireless communication, is easy to use, and reduces cost.
为了解决上述技术问题，本发明采用以下的技术方案： In order to solve the problems of the technologies described above, the present invention adopts the following technical solutions:
通过声波传输和无线通信测量身高的体重秤设备，包括家用体重秤以及为智能手机或者平板电脑的智能设备，智能设备和家用体重秤之间通过单向声波传输方式或双向声波传输方式测量身高； Weight scale equipment that measures height through sound wave transmission and wireless communication, including household weight scales and smart devices such as smartphones or tablet computers, and height is measured between smart devices and home weight scales through one-way sound wave transmission or two-way sound wave transmission;
单向声波传输方式，智能设备内置有第一声波发送模块，家用体重秤内置有与第一声波发送模块对应设置的第一声波接收模块，智能设备的壳体上设置有供第一声波发送模块发出声波的第一开孔，家用体重秤的壳体上表面设置有供第一声波接收模块接收声波的第二开孔，家用体重秤与智能设备之间通过WIFI或者蓝牙实现无线通信连接，单向声波传输方式的测量身高过程为，将智能设备的声音发送部位放在与头顶平齐的位置并能竖直向下发送第一声波，智能设备端通过第一声波发送模块发送带有标示的第一声波，并记录该第一声波的发送时间为第一时间点，家用体重秤端通过第一声波接收模块接收该带有标示的第一声波并识别，之后家用体重秤端通过WIFI或者蓝牙对智能设备端进行无线应答，智能设备端接收到家用体重秤端的无线应答后，记录接收到无线应答的时间为第二时间点，智能设备计算出第二时间点和第一时间点的时间间隔T1，上述时间间隔T1并不是第一声波的传播时间，第一声波的传播时间为该时间间隔T1减去系统响应时间ST1，系统响应时间ST1的获取方式为，将智能设备放在家用体重秤表面距离为零处，执行一次单向声波传输过程，计算出的时间间隔就是系统响应时间ST1，时间间隔T1减去系统响应时间ST1就得到第一声波的传播时间，于是测量身高为第一声波的传播时间乘以声波的波速，所述家用体重秤表面集成有温湿度传感器，温湿度传感器测得的环境温度和湿度通过WIFI或者蓝牙方式传输至智能设备内，智能设备通过温湿度传感器测得的环境温度和湿度查阅数据库获得声波的波速，数据库位于智能设备内，数据库内存有一定环境温度和湿度下对应的声波的波速，智能设备通过查阅得到的声波的波速进行测量身高的计算，智能设备的屏幕显示通过计算之后的身高； One-way sound wave transmission mode, the smart device has a built-in first sound wave sending module, the home scale has a built-in first sound wave receiving module corresponding to the first sound wave sending module, and the housing of the smart device is provided with a first sound wave receiving module. The first opening for the sound wave sending module to emit sound waves, the upper surface of the housing of the home scale is provided with the second opening for the first sound wave receiving module to receive sound waves, and the home scale and the smart device are realized through WIFI or Bluetooth Wireless communication connection, one-way sound wave transmission method of measuring height is as follows: put the sound sending part of the smart device at the same position as the top of the head and can send the first sound wave vertically downward, and the smart device end passes the first sound wave The sending module sends the first sound wave with the mark, and records the sending time of the first sound wave as the first time point, and the home scale end receives the first sound wave with the mark through the first sound wave receiving module and After the identification, the home scale terminal responds wirelessly to the smart device terminal through WIFI or Bluetooth. After the smart device terminal receives the wireless response from the home scale terminal, it records the time of receiving the wireless response as the second time point, and the smart device calculates the second time point. The time interval T1 between the second time point and the first time point, the above time interval T1 is not the propagation time of the first sound wave, the propagation time of the first sound wave is the time interval T1 minus the system response time ST1, the system response time ST1 The acquisition method is to place the smart device at a distance of zero from the surface of the household weighing scale, and perform a one-way sound wave transmission process. The calculated time interval is the system response time ST1, and the system response time ST1 is subtracted from the time interval T1 to get the second The propagation time of the sound wave, so the measured height is the propagation time of the first sound wave multiplied by the wave velocity of the sound wave. The surface of the home scale is integrated with a temperature and humidity sensor, and the ambient temperature and humidity measured by the temperature and humidity sensor are passed through WIFI or Bluetooth The smart device consults the database to obtain the wave speed of the sound wave through the ambient temperature and humidity measured by the temperature and humidity sensor. The database is located in the smart device, and the database stores the corresponding sound wave speed under a certain ambient temperature and humidity. The smart device Calculate the measured height by consulting the wave velocity of the sound wave obtained, and the screen of the smart device will display the calculated height;
双向声波传输方式，智能设备内置有第一声波发送模块和第二声波接收模块，家用体重秤内置有第一声波接收模块和第二声波发送模块，第一声波发送模块和第一声波接收模块对应设置，第二声波发送模块和第二声波接收模块对应设置，智能设备的壳体上设置有供第一声波发送模块发出声波、以及供第二声波接收模块接收声波的第一开孔，家用体重秤的壳体上表面设置有供第一声波接收模块接收声波、以及供第二声波发送模块发出声波的第二开孔，双向声波传输方式的测量身高过程为，将智能设备的声音发送部位放在与头顶平齐的位置并能竖直向下发送第一声波，智能设备端通过第一声波发送模块发送带有标示的第一声波，并记录该第一声波的发送时间为第一时间点，家用体重秤端通过第一声波接收模块接收该带有标示的第一声波并识别，之后家用体重秤端通过第二声波发送模块发送带有标示的第二声波，智能设备端通过第二声波接收模块接收该带有标示的第二声波并识别，并记录该第二声波的接收时间为第二时间点，智能设备计算出第二时间点和第一时间点的时间间隔T2，上述时间间隔T2并不是第一声波和第二声波的总传播时间，第一声波和第二声波的总传播时间为该时间间隔T2减去系统响应时间ST2，系统响应时间ST2的获取方式为，将智能设备放在家用体重秤表面距离为零处，执行一次双向声波传输过程，计算出的时间间隔就是系统响应时间ST2，时间间隔T2减去系统响应时间ST2就得到第一声波和第二声波的总传播时间，于是测量身高为第一声波和第二声波的总传播时间乘以声波的波速再除以2，所述家用体重秤表面集成有温湿度传感器，温湿度传感器测得的环境温度和湿度通过WIFI或者蓝牙方式传输至智能设备内，智能设备通过温湿度传感器测得的环境温度和湿度查阅数据库获得声波的波速，数据库位于智能设备内，数据库内存有一定环境温度和湿度下对应的声波的波速，智能设备通过查阅得到的声波的波速进行测量身高的计算，智能设备的屏幕显示通过计算之后的身高。 Two-way sound wave transmission mode, the smart device has a built-in first sound wave sending module and a second sound wave receiving module, the home scale has a built-in first sound wave receiving module and a second sound wave sending module, the first sound wave sending module and the first sound wave The wave receiving module is set correspondingly, the second sound wave sending module and the second sound wave receiving module are set correspondingly, and the casing of the smart device is provided with a first sound wave sending module for the first sound wave sending module and a first sound wave receiving module for the second sound wave receiving module. Opening, the upper surface of the housing of the household weighing scale is provided with a second opening for the first sound wave receiving module to receive sound waves and for the second sound wave sending module to emit sound waves. The sound sending part of the device is placed at the same position as the top of the head and can send the first sound wave vertically downward. The smart device sends the first sound wave with the mark through the first sound wave sending module and records the first sound wave. The sending time of the sound wave is the first time point. The home scale end receives and recognizes the first sound wave with the mark through the first sound wave receiving module, and then the home weight scale end sends the marked sound wave through the second sound wave sending module. For the second sound wave, the smart device receives and recognizes the second sound wave with the mark through the second sound wave receiving module, and records the receiving time of the second sound wave as the second time point, and the smart device calculates the second time point and The time interval T2 of the first time point, the above time interval T2 is not the total travel time of the first sound wave and the second sound wave, the total travel time of the first sound wave and the second sound wave is the time interval T2 minus the system response time ST2, the system response time ST2 is obtained by placing the smart device at a distance of zero from the surface of the household weighing scale, and performing a two-way sound wave transmission process. The calculated time interval is the system response time ST2, and the system response is subtracted from the time interval T2 Time ST2 just obtains the total propagation time of the first sound wave and the second sound wave, so the measured height is the total propagation time of the first sound wave and the second sound wave multiplied by the wave velocity of the sound wave and then divided by 2, the surface integration of the household weighing scale There is a temperature and humidity sensor, and the ambient temperature and humidity measured by the temperature and humidity sensor are transmitted to the smart device through WIFI or Bluetooth. The smart device consults the database to obtain the wave velocity of the sound wave through the ambient temperature and humidity measured by the temperature and humidity sensor. In the database, the corresponding sound wave velocity under a certain ambient temperature and humidity is stored in the database. The smart device calculates the measured height by consulting the obtained sound wave velocity, and the screen of the smart device displays the calculated height.
进一步，所述第二开孔和温湿度传感器设置在家用体重秤的壳体上表面的前端。 Further, the second opening and the temperature and humidity sensor are arranged at the front end of the upper surface of the housing of the household weighing scale.
进一步，所述智能设备为手机，手机的第一开孔设置于手机的侧端面。 Further, the smart device is a mobile phone, and the first opening of the mobile phone is arranged on a side end surface of the mobile phone.
本发明的有益效果是：1、结合家用体重秤和时下普及的智能设备（智能手机、平板电脑），通过智能设备和体重秤之间传输声波和无线通信方式测量身高；2、与现有一体式体重秤相比，本发明的体积大大减小，能够方便的布置在家庭之中，与常规家用体重秤相比，在增加少成本的情况下提供测量身高的功能。 The beneficial effects of the present invention are: 1. Combining household weighing scales with smart devices (smart phones, tablet computers) that are popular nowadays, the height is measured by transmitting sound waves and wireless communication between smart devices and weighing scales; 2. Integrating with the existing Compared with conventional weighing scales, the volume of the present invention is greatly reduced, and it can be conveniently arranged in families. Compared with conventional household weighing scales, it provides the function of measuring height with less cost.
附图说明 Description of drawings
图1为本发明通过声波传输和无线通信测量身高的体重秤设备实施例一的结构示意图； Fig. 1 is a structural schematic diagram of Embodiment 1 of a weight scale device for measuring height through sound wave transmission and wireless communication in the present invention;
附图标号：1-家用体重秤；2-家用体重秤；3-第二开孔；4-温湿度传感器。 Reference numerals: 1 - household weighing scale; 2 - household weighing scale; 3 - second opening; 4 - temperature and humidity sensor.
具体实施方式 detailed description
下面结合附图与实施例对本发明作进一步详细描述： Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:
实施例一 Embodiment one
参照图1：通过声波传输和无线通信测量身高的体重秤设备，包括家用体重秤1以及为智能手机的智能设备2，智能设备2和家用体重秤1之间通过单向声波传输方式或双向声波传输方式测量身高； Refer to Figure 1: A weight scale device that measures height through sound wave transmission and wireless communication, including a home weight scale 1 and a smart device 2 that is a smart phone. The smart device 2 and the home weight scale 1 are connected by one-way sound wave transmission or two-way sound waves Transmission method to measure height;
单向声波传输方式，智能设备2内置有第一声波发送模块，家用体重秤1内置有与第一声波发送模块对应设置的第一声波接收模块，智能设备2的壳体上设置有供第一声波发送模块发出声波的第一开孔，家用体重秤1的壳体上设置有供第一声波接收模块接收声波的第二开孔3，家用体重秤1与智能设备2之间通过WIFI或者蓝牙实现无线通信连接，单向声波传输方式的测量身高过程为，将智能设备2的声音发送部位放在与头顶平齐的位置并能竖直向下发送第一声波，智能设备端通过第一声波发送模块发送带有标示的第一声波，并记录该第一声波的发送时间为第一时间点，家用体重秤端通过第一声波接收模块接收该带有标示的第一声波并识别，之后家用体重秤端通过WIFI或者蓝牙对智能设备端进行无线应答，智能设备端接收到家用体重秤端的无线应答后，记录接收到无线应答的时间为第二时间点，智能设备2计算出第二时间点和第一时间点的时间间隔T1，上述时间间隔T1并不是第一声波的传播时间，第一声波的传播时间为该时间间隔T1减去系统响应时间ST1，系统响应时间ST1的获取方式为，将智能设备2放在家用体重秤1表面距离为零处，执行一次单向声波传输过程，计算出的时间间隔就是系统响应时间ST1，时间间隔T1减去系统响应时间ST1就得到第一声波的传播时间，于是测量身高为第一声波的传播时间乘以声波的波速，所述家用体重秤1表面集成有温湿度传感器4，温湿度传感器4测得的环境温度和湿度通过WIFI或者蓝牙方式传输至智能设备2内，智能设备2通过温湿度传感器4测得的环境温度和湿度查阅数据库获得声波的波速，数据库位于智能设备2内，数据库内存有一定环境温度和湿度下对应的声波的波速，智能设备2通过查阅得到的声波的波速进行测量身高的计算，智能设备2的屏幕显示通过计算之后的身高； In the one-way sound wave transmission mode, the smart device 2 has a built-in first sound wave sending module, the home scale 1 has a built-in first sound wave receiving module corresponding to the first sound wave sending module, and the housing of the smart device 2 is provided with The first opening for the first sound wave sending module to emit sound waves, the housing of the household weighing scale 1 is provided with the second opening 3 for the first sound wave receiving module to receive sound waves, the connection between the household weighing scale 1 and the smart device 2 The wireless communication connection is realized through WIFI or Bluetooth. The height measurement process of the one-way sound wave transmission method is as follows. The device side sends the first sound wave with the label through the first sound wave sending module, and records the sending time of the first sound wave as the first time point, and the home scale end receives the sound wave with the mark through the first sound wave receiving module. The marked first sound wave is recognized, and then the home weighing scale end wirelessly responds to the smart device end through WIFI or Bluetooth. After the smart device end receives the wireless answer from the home weighing scale end, record the time when the wireless answer is received as the second time point, the smart device 2 calculates the time interval T1 between the second time point and the first time point, the above time interval T1 is not the propagation time of the first sound wave, the propagation time of the first sound wave is the time interval T1 minus the system Response time ST1 and system response time ST1 are obtained by placing the smart device 2 at a distance from the surface of household weighing scale 1 at zero, and performing a one-way sound wave transmission process. The calculated time interval is the system response time ST1, time interval Subtract the system response time ST1 from T1 to obtain the propagation time of the first sound wave, so the measured height is the propagation time of the first sound wave multiplied by the wave velocity of the sound wave. The surface of the household weighing scale 1 is integrated with a temperature and humidity sensor 4, the temperature and humidity The ambient temperature and humidity measured by the sensor 4 are transmitted to the smart device 2 through WIFI or Bluetooth. The smart device 2 consults the database through the ambient temperature and humidity measured by the temperature and humidity sensor 4 to obtain the wave velocity of the sound wave. The database is located in the smart device 2. The database memory has the wave velocity of the corresponding sound wave under a certain ambient temperature and humidity, and the smart device 2 calculates the height by consulting the wave velocity of the sound wave obtained, and the screen of the smart device 2 displays the height after the calculation;
双向声波传输方式，智能设备2内置有第一声波发送模块和第二声波接收模块，家用体重秤1内置有第一声波接收模块和第二声波发送模块，第一声波发送模块和第一声波接收模块对应设置，第二声波发送模块和第二声波接收模块对应设置，智能设备2的壳体上设置有供第一声波发送模块发出声波、以及供第二声波接收模块接收声波的第一开孔，家用体重秤的壳体上表面设置有供第一声波接收模块接收声波、以及供第二声波发送模块发出声波的第二开孔3，双向声波传输方式的测量身高过程为，将智能设备2的声音发送部位放在与头顶平齐的位置并能竖直向下发送第一声波，智能设备端通过第一声波发送模块发送带有标示的第一声波，并记录该第一声波的发送时间为第一时间点，家用体重秤端通过第一声波接收模块接收该带有标示的第一声波并识别，之后家用体重秤端通过第二声波发送模块发送带有标示的第二声波，智能设备端通过第二声波接收模块接收该带有标示的第二声波并识别，并记录该第二声波的接收时间为第二时间点，智能设备2计算出第二时间点和第一时间点的时间间隔T2，上述时间间隔T2并不是第一声波和第二声波的总传播时间，第一声波和第二声波的总传播时间为该时间间隔T2减去系统响应时间ST2，系统响应时间ST2的获取方式为，将智能设备2放在家用体重秤1表面距离为零处，执行一次双向声波传输过程，计算出的时间间隔就是系统响应时间ST2，时间间隔T2减去系统响应时间ST2就得到第一声波和第二声波的总传播时间，于是测量身高为第一声波和第二声波的总传播时间乘以声波的波速再除以2，所述家用体重秤1表面集成有温湿度传感器4，温湿度传感器4测得的环境温度和湿度通过WIFI或者蓝牙方式传输至智能设备2内，智能设备2通过温湿度传感器4测得的环境温度和湿度查阅数据库获得声波的波速，数据库位于智能设备2内，数据库内存有一定环境温度和湿度下对应的声波的波速，智能设备2通过查阅得到的声波的波速进行测量身高的计算，智能设备2的屏幕显示通过计算之后的身高。 In the two-way sound wave transmission mode, the smart device 2 has a built-in first sound wave sending module and a second sound wave receiving module, the home scale 1 has a built-in first sound wave receiving module and a second sound wave sending module, the first sound wave sending module and the second sound wave The sound wave receiving module is set correspondingly, and the second sound wave sending module and the second sound wave receiving module are set correspondingly. The upper surface of the housing of the household weighing scale is provided with a second opening 3 for the first sound wave receiving module to receive sound waves and for the second sound wave sending module to emit sound waves. The height measurement process of the two-way sound wave transmission method In order to place the sound sending part of the smart device 2 at a level with the top of the head and send the first sound wave vertically downward, the smart device sends the first sound wave with the mark through the first sound wave sending module, And record the sending time of the first sound wave as the first time point, the home scale end receives the first sound wave with the mark through the first sound wave receiving module and recognizes it, and then the home weight scale end sends it through the second sound wave The module sends the second sound wave with the mark, and the smart device receives and recognizes the second sound wave with the mark through the second sound wave receiving module, and records the receiving time of the second sound wave as the second time point, and the smart device 2 calculates The time interval T2 between the second time point and the first time point, the above-mentioned time interval T2 is not the total propagation time of the first sound wave and the second sound wave, the total propagation time of the first sound wave and the second sound wave is the time interval T2 minus the system response time ST2, the system response time ST2 is obtained by placing the smart device 2 at a distance from the surface of the household weighing scale 1 at zero, and performing a two-way sound wave transmission process, the calculated time interval is the system response time ST2 , the time interval T2 minus the system response time ST2 will get the total travel time of the first sound wave and the second sound wave, so the measured height is the total travel time of the first sound wave and the second sound wave multiplied by the wave velocity of the sound wave and divided by 2 The surface of the household weighing scale 1 is integrated with a temperature and humidity sensor 4, and the ambient temperature and humidity measured by the temperature and humidity sensor 4 are transmitted to the smart device 2 through WIFI or Bluetooth, and the environment temperature and humidity measured by the smart device 2 through the temperature and humidity sensor 4 The temperature and humidity consult the database to obtain the wave speed of the sound wave. The database is located in the smart device 2. The database stores the corresponding sound wave speed under a certain ambient temperature and humidity. The smart device 2 calculates the height by checking the sound wave speed obtained. 2 screen displays the calculated height.
所述温湿度传感器4集成在所述家用体重秤1表面，温湿度传感器4测得的环境温度和湿度通过WIFI或者蓝牙方式传输至智能设备2内。 The temperature and humidity sensor 4 is integrated on the surface of the household weighing scale 1 , and the ambient temperature and humidity measured by the temperature and humidity sensor 4 are transmitted to the smart device 2 through WIFI or Bluetooth.
本实施例中，所述第二开孔3和温湿度传感器4设置在家用体重秤1的壳体上表面的前端，体重秤的中部供人体站立。所述智能设备2为手机，手机的第一开孔设置于手机的侧端面，也即手机的声音发送部位位于手机的侧端面。 In this embodiment, the second opening 3 and the temperature and humidity sensor 4 are arranged at the front end of the upper surface of the housing of the household weighing scale 1 , and the middle part of the weighing scale is for the human body to stand on. The smart device 2 is a mobile phone, and the first opening of the mobile phone is arranged on the side end surface of the mobile phone, that is, the sound sending part of the mobile phone is located on the side end surface of the mobile phone.
本发明的单向声波传输方式中，优选智能设备竖直向下发送声波，智能设备的第一声波发送模块和家用体重秤的第一声波接收模块在同一竖直线上，但稍有偏差也无碍，因为声波是扩散传播的，即便第一声波发送模块和第一声波接收模块之间稍微偏离竖直方向设置，第一声波接收模块还是能收到第一声波发送模块发出的第一声波，只不过传播路径稍微倾斜于竖直方向，通过该传播路径测得的身高和实际身高存在小误差但基本相同。双向声波传输方式类似。 In the one-way sound wave transmission mode of the present invention, it is preferable that the smart device sends sound waves vertically downward, and the first sound wave sending module of the smart device and the first sound wave receiving module of the household weighing scale are on the same vertical line, but slightly The deviation is not a problem, because the sound wave propagates diffusely. Even if the first sound wave sending module and the first sound wave receiving module are slightly deviated from the vertical direction, the first sound wave receiving module can still receive the first sound wave sending module. The first sound wave emitted by the module, but the propagation path is slightly inclined to the vertical direction, the height measured through this propagation path and the actual height have a small error but are basically the same. Two-way sound wave transmission works similarly.
实施例二 Embodiment two
本实施例与实施例一的不同之处在于：所述的智能设备采用平板电脑。本实施例的其他结构与实现方式与实施例一完全相同。 The difference between this embodiment and the first embodiment is that the smart device is a tablet computer. Other structures and implementations of this embodiment are completely the same as those of Embodiment 1.
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。 The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention within.
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