Mobile terminal device

Abstract

To provide a mobile terminal device having a vital-sign acquisition function, in which the ground is enhanced and the desensitization is suppressed more.SOLUTION: In a mobile terminal device 1, an FPC 9 has a ground line. This FPC 9 has one end side connected to a charging terminal substrate 71 and the other end side connected to a main substrate 34 through a sensor substrate 8 on the way, so that a first ground line is formed. While this first ground line is open on the charging terminal substrate 71 side, in the mobile terminal device 1 of this embodiment, the charging terminal substrate 71 and the main substrate 34 are electrically connected by a second ground line, which is different from the first ground line, by the FPC 9. Thus, the ground is connected in a loop shape, the ground between the main substrate 34 and the sensor substrate 8 is enhanced, and the desensitization is suppressed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a portable terminal device, and more particularly to a portable terminal device that is worn and has various processing functions such as a function for acquiring vital information and a function for communicating with external devices. [Background technology]

[0002] 2. Description of the Related Art Small-sized portable terminal devices that can be worn on the wrist or hung from the neck have become widespread. For example, there are watch-type mobile terminal devices that have a communication function, allowing users to check emails received on their smartphones and make calls. Furthermore, with the rise in awareness of health management, portable terminal devices that can be worn on a part of the body such as the wrist, finger, or leg to easily measure vital information while going about one's daily life are becoming more common. For example, Patent Document 1 proposes technology for a smartwatch that, in addition to displaying the time, detects vital signs (biological information) such as heart rate when worn on the wrist and displays them on an LCD screen, as well as transmitting the detected vital signs to an external device such as a smartphone. Such smartwatches include a battery, sensor board, main board, wireless antenna, liquid crystal display device, etc., housed within a housing, and are connected by an FPC (flexible printed circuit board) that includes power lines, ground lines, etc. One end of the FPC is connected to a charging terminal that enables charging from an external source, and the other end is connected to the main board via the sensor board (partial connection).

[0003] Smartwatches are equipped with the ability to communicate wirelessly with external devices such as smartphones and LTE (Long Term Evolution) base stations. However, if the radio equipment mounted on the main board contains components with weak grounding (high impedance), such as a sensor board, CPU noise and power supply noise on the main board can pick up on the components, causing performance degradation such as reduced sensitivity. Furthermore, in smartwatches, the FPC connected to the sensor board located on the bottom side of the housing (the side that comes into contact with the wrist) has one end connected to the charging terminal and the other end connected to the main board, which means that the ground is weak and prone to picking up noise.

[0004] This problem is not limited to smartwatches, but is common to all portable terminal devices that are small enough to be worn on the body. In other words, in the case of a portable terminal device that is worn on the human body, such as on the hand or ankle, or hung from the neck, the size of the designated board connected to the charging terminal weakens the ground, making it more susceptible to noise. As a noise countermeasure, it is possible to install a metal plate, for example, in the case of a smart watch, to sandwich a large metal plate between the main board and the sensor board. However, providing a metal plate increases the thickness and weight of the mobile terminal device, and also increases the cost. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Publication No. 2022-153424 Summary of the Invention [Problem to be solved by the invention]

[0006] An object of the present invention is to further strengthen the ground and further suppress desensitization in a mobile terminal device. [Means for solving the problem]

[0007] In the invention described in claim 1, a predetermined substrate on which a functional unit for realizing functions of the mobile terminal device is disposed; a battery that supplies power to the predetermined board; an antenna for communicating with the outside; a charging terminal for charging the battery; a first ground line electrically connecting the charging terminal and the predetermined substrate; a second ground line electrically connecting the charging terminal and the predetermined substrate via a path different from that of the first ground line; The present invention provides a mobile terminal device having the above features. [Effects of the Invention]

[0008] According to the present invention, a second ground line is provided that electrically connects the charging terminal and the specified board via a path separate from the first ground line that electrically connects the charging terminal and the specified board, thereby further strengthening the ground in the mobile terminal device and further reducing sensitivity suppression. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 2 is an explanatory diagram illustrating the appearance of a mobile terminal device. [Figure 2] FIG. 2 is a cross-sectional view of the mobile terminal device. [Figure 3] FIG. 1 is an explanatory diagram of a loop connection of an FPC inside a mobile terminal device. [Figure 4] FIG. 10 is a cross-sectional view of a portable terminal device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] A preferred embodiment of the mobile terminal device of the present invention will be described in detail below with reference to FIGS. In the following embodiment, a portable terminal device that is worn on the wrist and acquires vital information of the user will be described as an example of a portable terminal device that is worn on the body. (1) Overview of the embodiment In the mobile terminal device 1 of this embodiment, the FPC 9 has a ground line, and one end of this FPC 9 is connected to the charging terminal board 71, and the other end is connected to the main board 34 via the sensor board 8, thereby forming a first ground line. This first ground line is open on the charging terminal board 71 side, whereas in the mobile terminal device 1 of this embodiment, the charging terminal board 71 and the main board 34 are electrically connected by a second ground line separate from the first ground line via the FPC 9. This results in a ground connection in a loop, strengthening the ground between the main board 34 and the sensor board 8 and suppressing sensitivity suppression.

[0011] The second ground line is formed by wrapping a conductive cloth around a battery holder 33 located between the charging terminal portion 7 for charging the battery 32 and the main board . That is, the battery 32, the battery holder 33, the conductive cloth 35, and the conductive parts of the main board 34 (such as the shield case 342) are electrically connected to form a separate line, and the ground is connected in a loop by this separate line and the FPC 9. The battery holder 33 around which the conductive cloth 35 is wound is prevented from becoming thick due to the winding of the conductive cloth 35 by shaving off the outer periphery (at least in the thickness direction) around which the conductive cloth 35 is wound.

[0012] (2) Details of the embodiment FIG. 1 shows the external appearance of a mobile terminal device 1. As shown in FIG. As shown in FIG. 1, the mobile terminal device 1 of this embodiment is fixed to the wrist H by providing belts 2 on two opposing side surfaces of the device body 11. The belt 2 functions as a mounting means for attaching the device main body 11 to the human body in a state in which vital information can be acquired. Although the device body 11 is shown to have a rectangular shape as shown in FIG. 1, various shapes such as a circle or a star shape can be adopted.

[0013] The device main body 11 comprises a case side periphery 3, a switch 4, a liquid crystal display device 5, a case bottom 6, a charging terminal section 7, a sensor board 8, and a belt fastener 21, as can be seen in Figure 1(a) which shows the front side when worn on the wrist H, and Figure 1(b) which shows the back side which is in close contact with the wrist H. The case side peripheral portion 3 is formed in a circular rectangular shape with rounded edges on all four sides so as to define the outer shape of the device main body 11. Although not shown, an antenna 31 is disposed on the inner peripheral surface of the case side peripheral portion 3 (see FIG. 2). In this embodiment, the case side periphery 3 is made of a non-metallic material such as resin that is plated with metal in order to prevent a decrease in antenna radiation efficiency, but it can also be made of a metallic material.

[0014] The switch 4 is a switch button that penetrates the peripheral side surface of the case side peripheral portion 3, and is an input device for performing operations such as instructing the mobile terminal device 1 to start acquiring vital information. Although FIG. 1 shows a state in which only one switch 4 is provided, it is also possible to provide two or more switches.

[0015] The liquid crystal display device 5 is disposed on the upper surface side of the open top and bottom surfaces of the case side periphery 3, and is provided with glass on the top surface to protect the liquid crystal. The liquid crystal display device 5 has a liquid crystal display for displaying vital sign information detected in this embodiment, displaying various information corresponding to the clock function and image display function of the mobile terminal device 1, and displaying various information transmitted from external devices. Note that an organic EL display (electroluminescence) may be used instead of a liquid crystal display. The liquid crystal display device 5 has various touch panels arranged on the upper surface of the liquid crystal display, and a glass cover arranged on the top surface. The touch panel is an input device that causes the liquid crystal display device 5 to function as an input device. The touch panel detects the position touched (pressed) by the user, and acquires inputs and instructions corresponding to various icons and the like displayed on the liquid crystal display corresponding to the touched position.

[0016] The case bottom 6 is fixed to the lower surface side (opposite the liquid crystal display device 5) of the upper and lower open surfaces of the case side peripheral portion 3, thereby forming the housing of the device main body 11 together with the case side peripheral portion 3. In this embodiment, the case side peripheral portion 3 and the case bottom portion 6 are formed as separate bodies, but they can also be formed as an integrated body. In this embodiment, the case bottom 6 is made of a non-metallic material such as resin that is metal-plated to suppress a decrease in antenna radiation efficiency, similar to the case side peripheral portion 3 in this embodiment, but it can also be made of a metallic material. The case bottom 6 is made of the same material as the case side periphery 3, but can also be made of a different material. However, when the case side periphery 3 and the case bottom 6 are formed, the same material is used. The case bottom 6 has through holes formed therein for the sensor board 8 and the charging terminal board 71 of the charging terminal section 7 .

[0017] The charging terminal section 7 includes a charging terminal board 71 shown in FIG. 1(b) and a charging terminal holder 72, which will be described later. The charging terminal board 71 is a terminal for charging the battery 32 (described later) housed inside the device main body 11. In this embodiment, the charging terminal board 71 is connected to the battery 32 by a connection wire (not shown). Part of the terminal of the charging terminal board 71 penetrates the case bottom 6 and is exposed to the outside, and the internal battery 32 is charged by connecting the charging terminal board 71 to a charging IC and a charger (not shown).

[0018] The sensor board 8 is a board on which sensors for acquiring vital information of a user wearing the mobile terminal device 1 are arranged, and a part of the board including the sensor is arranged to penetrate the case bottom 6. The sensor board 8 is arranged to protrude slightly from the case bottom 6, so that it is placed in closer contact with the user's skin (wrist H) (see FIG. 2(a)). The sensor board 8 is provided with sensors corresponding to the vital sign detection function of the mobile terminal device 1, and at least one of various sensors is provided to detect, for example, the user's heart rate, pulse wave, respiratory rate, blood pressure, blood oxygen concentration (SpO2), body temperature, etc.

[0019] The belt stoppers 21 are members for fixing the belt 2 to the device body 11, and are disposed on two opposing end faces of the case bottom 6. The belt stoppers 21 may also be disposed on the case side periphery 3.

[0020] Next, the internal configuration of the mobile terminal device 1 will be described. Fig. 2 shows a cross section of the mobile terminal device 1. Fig. 2(a) shows a cross section in the left-right direction at the position of the sensor board 8 in Fig. 1(b), and Fig. 2(b) shows a cross section in the left-right direction at the position of the charging terminal board 71. FIG. 3 shows planar layout information inside the mobile terminal device 1 and the loop connection of the FPC 9.

[0021] As shown in Figure 2(a), within the mobile terminal device 1, from the bottom (wrist side), a sensor board 8, a sensor board holder 81, a battery 32, and a main board 34 are arranged, and three of the side surfaces of the battery 32 are prevented from moving horizontally by a battery holder 33. As described above, the sensor board 8 is placed in one of the two through holes formed in the case bottom 6, with a portion of its thickness protruding from the case bottom 6, and is fixed inside the device main body 11 by screwing or taping a metal sensor board holder 81 to the case bottom 6. The battery 32 is a power source that supplies power to the main board 34 and the sensor board 8, and is a rechargeable battery such as a lithium ion battery or a nickel-metal hydride battery.

[0022] The main board 34 functions as a specified board and is equipped with a control unit consisting of a CPU, ROM, RAM, memory device, etc., and various elements for realizing various functions such as the vital information acquisition function of the mobile terminal device 1, clock function, communication function, screen display function, and information processing. The ROM and storage device store various programs that enable the CPU to realize the functions of the mobile terminal device 1. For example, the CPU executes a vital sign information program to calculate vital sign information such as heart rate and blood oxygen concentration from data detected by the sensor board 8, and display the information on the liquid crystal display device 5 or transmit it to an external device via the antenna 31.

[0023] An antenna 31 is disposed on the inner peripheral surface of the case side peripheral portion 3 . The antenna 31 is provided with various antennas 31 corresponding to the various functions of the mobile terminal device 1, such as an LTE antenna, a GNN antenna, a WLAN antenna, an antenna for Bluetooth or WiFi, for sending and receiving data (for example, sending detected vital information, receiving various processing instructions, making calls, sending and receiving emails, etc.) between various external devices such as smartphones, personal computers, and servers. The antenna 31 may be disposed on the main board in addition to the inner peripheral surface of the case side peripheral portion 3 .

[0024] As shown in Figure 2(b), the charging terminal board 71 of the charging terminal section 7 is placed in the other through-hole formed in the case bottom 6, and is fixed to the case bottom 6 from above (the liquid crystal display device 5 side) by a charging terminal holder 72 using screws or tape. The charging terminal holder 72 is formed from a conductive material such as metal or conductive resin.

[0025] FIG. 3(a) is a view of the case bottom 6 and its mounting object as seen from the liquid crystal display device 5 side. 3(a), the sensor board 8 is placed in one of the through-holes (not shown) in the case bottom 6, and is fixed from above (inside the device body 11) by a sensor board holder 81. The charging terminal board 71 is placed in the other through-hole (not shown), and is fixed from above by a charging terminal holder 72.

[0026] An FPC 9 is disposed on the case bottom 6 . One end of the FPC 9 is connected to the charging terminal board 71, passes from the side facing the charging terminal board 71 under the sensor board retainer 81 (towards the sensor board 8), exits from the opposite side in the longitudinal direction (the vertical direction in the drawing) of the case bottom 6, and then runs along the bottom surface of the case bottom 6, around the outside of the sensor board retainer 81, and extends to approximately the center in the longitudinal direction of the case bottom 6. A male FPC connector 91 is connected to the other end of the FPC 9.

[0027] The FPC 9 is made up of power lines, signal lines, and ground lines, and is formed in a flat plate shape while being insulated from one another as a whole. The FPC connector 91 of the FPC 9 is electrically connected to the main board by being connected to a female connector 341 (see FIG. 3(c)) provided on the main board . The power supply line is connected to the main board 34 by being laid from the charging terminal board 71 to the FPC connector 91. The power supply line branches off midway and is connected to the sensor board 8. The signal line is laid from the sensor board 8 to the FPC connector 91, thereby connecting the sensor board 8 and the main board . The ground line is arranged from the charging terminal board 71 to the FPC connector 91, so that it is connected to the main board 34, and also branches off midway to be connected to the sensor board 8. As a result, the ground line of the FPC 9 functions as the first ground line in conventional devices. In addition, the ground wire of FPC9 and charging terminal holder 72 are electrically conductive.

[0028] FIG. 3(b) is a view of the battery 32 and the battery holder 33 as seen from the liquid crystal display device 5 side. As shown in Figure 3(b), the battery holder 33 is formed in a U-shape by integrally forming two opposing side holders 331 of different lengths and an upper surface holder 332 connected to both end portions of the side holders 331. Conductive cloth 35 is wound around the upper surface holder 332 of the battery holder 33 (see Fig. 3(b) and Fig. 2(b)). Note that in Fig. 2(b), the conductive cloth 35 is shown to be much thicker than it actually is to make its presence more easily apparent, but in reality it is wound much thinner. 3(b) and 2(b), the conductive cloth 35 is wrapped around the center of the top surface holder 332, but it may be wrapped around a longer range, for example, the entire length (the distance between the two side surface holders 331). This allows for greater freedom in the shape and arrangement of the shield case 342 (see FIG. 3(c)).

[0029] A rectangular battery 32 is arranged inside the U-shaped battery holder 33. The battery 32 is fixed in place by abutting three of its four side surfaces against the battery holder 33.

[0030] FIG. 3(c) is a view of the main board 34 seen from the case bottom 6 side. As shown in FIG. 3(a), the main board 34 has a connector 341 disposed on the surface facing the battery 32 for connecting the FPC 9 including the power line and the ground line. In addition, shield cases 342 to 344 for the respective elements are arranged on the main board . As an example, three shield cases are provided, but the number can be determined according to the components of the main board 34. Although not shown, it is also possible to strengthen the ground by connecting each shield case with conductive cloth or conductive tape. The shield case 342 is electrically connected to the ground line of the FPC 9 connected to the connector 341 .

[0031] Then, the battery holder 33 and the battery 32 arranged as shown in Figure 3(b) are placed on top of the case bottom 6 shown in Figure 3(a) so that the top surface holder 332 of the battery holder 33 is positioned on the charging terminal holder 72, thereby electrically connecting the metal charging terminal holder 72 and the conductive cloth 35. Furthermore, by turning the main board 34 shown in Figure 3(c) upside down from the state shown in the figure and arranging it so that the shield case 342 is positioned on top of the conductive cloth 35, the conductive cloth 35 and the shield case 342 are electrically connected. As a result, as shown in Figure 2(b), the battery holder 33 wrapped with conductive cloth 35 is placed on top of the charging terminal section 7 (charging terminal board 71) on the case bottom 6, and the shielding case 342 of the main board 34 is placed on top of that. As a result, charging terminal board 71, charging terminal holder 72, conductive cloth 35, and shield case 342 of main board 34 are electrically connected to form a second ground line. Furthermore, by connecting the charging terminal board 71 and the main board 34 with a first ground line by the FPC 9 and a second ground line separate from the first ground line, a ground connected in a loop can be achieved. This strengthens the ground between the main board 34 and the sensor board 8, and reduces sensitivity suppression.

[0032] As described above, according to the mobile terminal device 1 of this embodiment, the charging terminal board 71 and the main board 34 are electrically connected by a new second ground line with a separate route in addition to the first ground line using the FPC 9 that has been conventionally present. This results in a ground connection in a loop, strengthening the ground between the main board 34 and the sensor board 8 and suppressing sensitivity suppression. Furthermore, since no metal plate is disposed between the main board 34 and the sensor board 8 but the conductive cloth 35 is simply wound around them, noise countermeasures can be implemented inexpensively and the thickness does not increase.

[0033] The above describes one embodiment of the mobile terminal device 1 of the present invention, but the present invention is not limited to the described embodiment, and various modifications can be made within the scope, embodiment, and modified example described in each claim. FIG. 4 is a cross-sectional view of a mobile terminal device according to a modified example. In the described embodiment and variant, the charging terminal board 71 and the shield case 342 of the main board 34 are connected by wrapping conductive cloth 35 around the upper surface holder 332, thereby forming a second ground line passing through the charging terminal holder 72. In contrast to this, as shown in Figure 4(a), a conductive connection pin 36 that connects to the other may be erected on at least one of the main board 34 and the charging terminal holder 72, thereby forming a second ground line that passes through the charging terminal holder 72. The arrangement of the connection pins 36 is particularly effective when there is no battery holder 33, when there is a battery holder but it is not on the charging terminal board 71, or when there is no top surface holder 332. When the battery holder 33 described in the embodiment and the modified example is present, a through hole through which the connection pin 36 passes is formed at the position where the connection pin 36 is disposed.

[0034] As shown in FIG. 4(b), the second ground line can be formed by using a conductive gasket 37 that is conductive and compressible, instead of the conductive cloth 35. In this case, the conductive gasket 37 used is elastic and conductive, and is placed between the charging terminal holder 72 and the top surface holder 332 of the battery holder 33, and between the top surface holder 332 and the shield case 342 of the main board 34. In addition, similar to the conductive cloth 35 of the embodiment, the conductive gasket 37 may be wound around the upper surface retainer 332. Furthermore, the conductive gasket 37 may be disposed between the charging terminal holder 72 and the shield case 342 of the main board 34 so as to be in direct contact with the charging terminal holder 72 and the shield case 342 of the main board 34 .

[0035] Furthermore, it is also possible to form the second ground line using an FPC other than the FPC 9.

[0036] In the embodiment and modified examples described above, the battery 32 is disposed on the case bottom 6 side, and the main board 34 is disposed above it (on the liquid crystal display device 5 side). Alternatively, the main board 34 may be disposed on the case bottom 6 side, and the battery 32 may be disposed above it.

[0037] Furthermore, in the described embodiments and variants, the charging terminal section 7 is arranged within the projection range of the main board 34, i.e., a part of the main board 34 is located above the charging terminal section 7, but the charging terminal section 7 may also be arranged outside the projection range of the main board 34. In this case, the second ground line connecting charging terminal board 71 and main board 34 is formed by wiring such as an FPC. The wiring may connect charging terminal board 71 and main board 34 directly, or may connect them via another member.

[0038] In the embodiment and modified examples described above, the first ground line connecting the charging terminal board 71 and the main board 34 passes through the sensor board 8 along the way, but it is also possible that it does not pass through. For example, in FIG. 3(a), the FPC 9 coming out of the charging terminal board 71 may pass outside the sensor board retainer 81 (opposite the side where the FPC connector 91 and connector 341 are arranged) instead of passing under it. In this case, the sensor board 8 does not go through the FPC 9, so it is possible to receive power supply via the main board 34 rather than from the FPC 9.

[0039] In the mobile terminal device 1 and the modified example described above, the device main body 11 is attached to the wrist H (human body) by the belt 2. On the other hand, as long as the device can be worn anywhere on the human body in a state where vital information of the wearer can be acquired, it does not have to be a wrist belt 2, and can be worn anywhere on the ankle, neck, thigh, forehead, etc. For example, the mobile terminal device main body may be fixed inside a hat or a supporter.

[0040] Furthermore, in the described embodiments and variants, a smart watch having a sensor board 8 and the function of acquiring vital information has been described as an example of a mobile terminal device, but the present invention can also be applied to mobile terminal devices having other functions. For example, by transmitting and receiving data between an external device such as a smartphone via an antenna, it can also be applied to mobile terminal devices that have the function of checking emails forwarded from the external device or making calls. Even in the case of a mobile terminal device that does not have such a sensor board 8, in addition to a first ground line that electrically connects the charging terminal board 71 to a specified board (including the main board 34), a second ground line is provided that electrically connects the charging terminal board 71 to the specified board via a path separate from the first ground line. Furthermore, if the mobile terminal device does not have the function of acquiring vital information, it does not necessarily have to be worn on the wrist, but can be worn around the neck with a portable strap or attached to a bag with a key chain.

[0041] From the above-described embodiments and modifications, the mobile terminal device can be configured as follows. (Configuration 1) A predetermined substrate on which a functional unit for realizing the functions of a mobile terminal device is arranged; a battery that supplies power to the predetermined board; an antenna for communicating with the outside; a charging terminal for charging the battery; a first ground line electrically connecting the charging terminal and the predetermined substrate; a second ground line electrically connecting the charging terminal and the predetermined substrate via a path different from that of the first ground line; A mobile terminal device comprising: (Configuration 2) The first ground line electrically connects the charging terminal and the predetermined substrate via an FPC having a ground line and a power line. 2. The mobile terminal device according to configuration 1, (Configuration 3) A wearing means for wearing the mobile terminal device on a human body; a sensor unit that detects biological information while the device is attached by the attachment means; a transmitting means for transmitting the detected biological information to an external device via the antenna; 3. The mobile terminal device according to claim 1, further comprising: (Configuration 4) The first ground line further includes a signal line, which passes through the sensor unit on the way. 4. The mobile terminal device according to configuration 3. (Configuration 5) A case body having a case bottom and a case side periphery, The sensor unit is disposed so that a part of the sensor unit in the thickness direction penetrates the bottom of the case. 5. The mobile terminal device according to configuration 3 or 4. (Configuration 6) The charging terminal is disposed so that a portion of the charging terminal in the thickness direction penetrates the bottom of the case, and is fixed from the inside of the case body by a conductive charging terminal holder. 6. The mobile terminal device according to configuration 5. (Configuration 7) The second ground line electrically connects the charging terminal and the predetermined substrate by a conductive cloth, a conductive connection pin, or a conductive gasket. 7. The mobile terminal device according to any one of configurations 1 to 6, wherein: (Configuration 8) A battery holder, a portion of which is disposed above the charging terminal and abuts against a side surface of the battery to suppress horizontal movement; a conductive cloth wound around at least a part of the portion of the battery holder that is disposed above the charging terminal; the second ground line electrically connects the charging terminal and the predetermined substrate via the conductive cloth; 7. The mobile terminal device according to any one of configurations 1 to 6, wherein: [Explanation of symbols]

[0042] 1. Mobile terminal device 2 Belt 3 Case side periphery 4 Switch 5 LCD display device 6 Bottom of the case 7 Charging terminal section 71 Charging terminal board 72 Charging terminal holder 8 Sensor board 81 Sensor board holder 9 FPC 91 FPC connector (male) 11 Device body 21 Belt stopper 31 Antenna 32 Batteries 33 Battery Folder 331 Side Support 332 Upper surface holder 34 Main board 341 Connector (female) 342~344 Shield Case 35 Conductive cloth 36 connecting pins 37 Gasket

Claims

1. a predetermined substrate on which a functional unit for realizing functions of the mobile terminal device is disposed; a battery that supplies power to the predetermined board; an antenna for communicating with the outside; a charging terminal for charging the battery; a first ground line electrically connecting the charging terminal and the predetermined substrate; a second ground line electrically connecting the charging terminal and the predetermined substrate via a path separate from the first ground line; A mobile terminal device comprising:

2. the first ground line electrically connects the charging terminal and the predetermined substrate via an FPC having a ground line and a power line; 2. The mobile terminal device according to claim 1, wherein:

3. a wearing means for wearing the mobile terminal device on a human body; a sensor unit that detects biological information while the device is attached by the attachment means; a transmitting means for transmitting the detected biological information to an external device via the antenna; 3. The mobile terminal device according to claim 1, further comprising:

4. the first ground line further includes a signal line, the signal line passing through the sensor unit on the way; 4. The mobile terminal device according to claim 3.

5. a case body having a case bottom and a case side periphery; The sensor unit is disposed so that a part of the sensor unit in the thickness direction penetrates the bottom of the case.

4. The mobile terminal device according to claim 3.

6. The charging terminal is disposed so that a portion of the charging terminal in the thickness direction penetrates the bottom of the case, and is fixed from the inside of the case body by a conductive charging terminal holder.

6. The mobile terminal device according to claim 5,

7. the second ground line electrically connects the charging terminal and the predetermined substrate by a conductive cloth, a conductive connection pin, or a conductive gasket; 7. The mobile terminal device according to claim 6,

8. a battery holder, a portion of which is disposed above the charging terminal and which abuts against a side surface of the battery to suppress horizontal movement; a conductive cloth wound around at least a part of the portion of the battery holder that is disposed above the charging terminal; the second ground line electrically connects the charging terminal and the predetermined substrate via the conductive cloth; 3. The mobile terminal device according to claim 1 or 2.

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