Wrist-worn terminal device

Abstract

To provide an arm-mounted terminal device which can determine whether the terminal has been mounted or not, more stably.SOLUTION: An arm-mounted terminal device includes a body section (1), and a belt (2) for fixing the body section (1) to an arm. The belt (2) serves as an insulating member in at least a certain range from an end connected to the body section (1), and includes a first electrode (21) located inside of both ends of the body section (1) in a width direction perpendicular to an extension direction of the belt (2), along a surface facing the arm in the certain range. The body section (1) has a measurement unit which measures capacitance related to the first electrode (21).SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a wrist-worn terminal device. [Background technology]

[0002] For battery-operated portable electronic devices, there is a technology to enter a power-saving state in which the functional operations to be executed are reduced to reduce power consumption when the device is not in use. In a mobile terminal worn on the arm (wrist-worn terminal device), determining whether the device is in an unused state may include determining whether the wrist-worn terminal device is not being worn on the arm.

[0003] Patent Document 1 discloses a technique for measuring the wearing state by using an acceleration sensor, measuring capacitance based on current or voltage measurement, or using a sensor that uses mechanical contacts. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-0232874 Summary of the Invention [Problem to be solved by the invention]

[0005] Sensors that use capacitance have the problem that, depending on the material of the surface on which the wrist-worn terminal device is removed and placed, capacitance may be generated in relation to the material, resulting in false detection.

[0006] An object of the present invention is to provide a wrist-worn terminal device that can more stably determine whether or not the device is being worn. [Means for solving the problem]

[0007] In order to achieve the above object, the present invention provides a main body; a belt for fastening the main body to the arm; Equipped with The belt is an insulating member in at least a certain range from the end connected to the main body, and is located inside both ends of the main body in the width direction perpendicular to the extending direction of the belt, and is positioned along the surface facing the arm within the certain range. vinegar a first electrode, The main body has a housing, a measuring unit that measures the capacitance related to the first electrode, and a second electrode that is located inside along the housing and connected to the measuring unit. death, the belt has a connecting portion connected to the main body portion, and a third electrode electrically connected to the first electrode and positioned on the connecting portion opposite the second electrode with the housing interposed therebetween; a determination processing unit that determines whether the belt is worn on the user's arm based on a measurement result of the capacitance by the measurement unit, It is a wrist-worn terminal device. [Effects of the Invention]

[0008] According to the present invention, it is possible to more stably determine whether or not a wrist-worn terminal device is being worn. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a diagram illustrating a wrist-worn terminal device according to an embodiment of the present invention; [Figure 2] FIG. 2 is a diagram illustrating an outline of a configuration related to wrist attachment detection. [Figure 3] FIG. 2 is a diagram showing the route of a signal line in a belt. [Figure 4] 10 is a diagram showing the positional relationship between the placement surface and the first electrode when the wrist-worn terminal device in an unworn state is placed on the placement surface. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a wrist-worn terminal device 100 according to this embodiment. FIG. 1 shows a side view (a) and a cross-sectional view (b) of a wrist-worn terminal device 100 worn on the arm.

[0011] As shown in FIG. 1(a), the wrist-worn terminal device 100 is, for example, a smart watch, and includes a main body 1 and two belts 2 and 3.

[0012] The upper surface of the main body 1, surrounded by the housing 10, is a display surface, and the display surface has a display screen 12a, and push button switches B1 to B3 protrude from the side of the housing 10. In addition, a first electrode 21 included in a sensor for detecting whether or not the device is worn on the arm A is located along the inside near the base of the belt 2 (the side facing the arm A).

[0013] 1(b), a circuit board 11, a display unit 12, a battery (not shown), and other components are located inside the housing 10. The interior of the housing 10 is sealed by a crystal 19 located on the top side and a back cover 14 located on the bottom side.

[0014] The substrate 11 is not particularly limited, but is a printed circuit board (PCB), and an electric / electronic circuit is printed on the substrate 11. Power is supplied from a battery to the electronic circuit of the substrate 11, and each part connected to the substrate 11 operates.

[0015] The board 11 is equipped with a CPU 13 (Central Processing Unit) (discrimination processing section, see FIG. 2), a RAM (Random Access Memory), a wearable measurement section 18 (see FIG. 2), and a pulse sensor (not shown). The CPU 13 is a hardware processor that performs calculations and controls the overall operation of the wrist-worn terminal device 100. The RAM provides the CPU 13 with working memory space and stores temporary data. The wearable measurement section 18 measures the capacitance associated with the first electrode 21 and outputs the measurement results to the CPU 13. The CPU 13 receives the measurement results and detects whether the wrist-worn terminal device 100 (particularly the belt 2 in this case) is worn on the arm. The pulse sensor, for example, uses a reflective photoplethysmography method and calculates the pulse by measuring changes in blood flow (periodic increases and decreases in oxygenated hemoglobin) in the blood vessels of the arm on which the wrist-worn terminal device 100 is worn.

[0016] Other functional components, such as various sensors, a communication unit, and a radio wave receiving unit, may be connected to the substrate 11. For example, various sensors may include an acceleration sensor, a pulse sensor, and a direction (geomagnetic field) sensor.

[0017] The display unit 12 performs display operations on the display screen 12a under the control of the CPU 13. The display screen 12a may be capable of displaying various characters, numbers, simple graphs, charts, etc. The display screen 12a is, for example, a liquid crystal display (LCD).

[0018] The battery includes, for example, a secondary battery and a power generation unit. The secondary battery is chargeable and dischargeable, being charged according to the power generation by the power generation unit and discharging according to the operation of the CPU 13 and the like. The secondary battery may be detachable and replaceable, or may be built into and fixed in the wrist-worn terminal device 100. The power generation unit generates power using solar power, for example. The power generation unit generates power by detecting light incident from above. The power generation unit may be capable of generating power according to the amount of light, even if the incident light is weaker than sunlight, such as from indoor lighting.

[0019] Connection parts 15 of the housing 10 protrude from both ends of the main body 1, that is, from the upper and lower sides in the display direction of the display screen 12a. Belts 2 and 3 are connected to the connection parts 15, respectively. A second electrode 16 is located within the connection part 15 via a signal line 17 extending from the substrate 11. The signal line 17 and the second electrode 16 may be a series of plate-like members, and in this case, they may be bent along the way or have a variable width depending on the orientation and size of the second electrode 16, which will be described later.

[0020] Belts 2 and 3 are members for attaching and fixing main body 1 to the arm. Belts 2 and 3 have connecting parts 20 and 30 at one end, respectively, which connect to connecting part 15 of main body 1, and extend at the other end so that they can be connected and fixed to each other at an appropriate location depending on the arm size, etc. Here, belts 2 and 3 are made of an insulating material such as resin, particularly in a certain range from the side where they connect to main body 1 (here, the entire belt, including connecting parts 20 and 30), but the connecting parts between belts 2 and 3 may also include metal fittings or the like.

[0021] Next, detection of wrist wear in the wrist-worn terminal device 100 of this embodiment will be described. The wrist-worn terminal device 100 of this embodiment measures the capacitance of the electrode positioned opposite the arm, and determines whether or not it is facing the arm based on the change in the capacitance.

[0022] FIG. 2 is a diagram illustrating an outline of the configuration related to wrist attachment detection. In this configuration, belt 2 (which may be belt 3) has a first electrode 21, a third electrode 22, and a signal line 23 electrically connecting first electrode 21 and third electrode 22, and main body 1 has a second electrode 16, a wearing measurement unit 18, a signal line 17 connecting second electrode 16 and wearing measurement unit 18 (measurement unit), and a CPU 13 to which wearing measurement unit 18 is electrically connected via wiring.

[0023] As described above, the first electrode 21 is located on the inner surface of the belt 2, i.e., on the surface facing the arm A when the device is worn on the arm A. The third electrode 22 is located at the connecting portion 20 of the belt 2, in close proximity to or in contact with the outer periphery of the main body 1 (connecting portion 15 of the housing 10) and facing it. The first electrode 21 and the third electrode 22 may be exposed, and in this case, their surfaces may be covered with an insulating protective film (including, in this case, a passivation film (oxide film) of the conductive metal of the electrode) or the like. Alternatively, the first electrode 21 and the third electrode 22 may be embedded in the belt 2.

[0024] The second electrode 16 is located along the housing 10, inside the housing 10, and is adjacent to and faces the third electrode 22 across the housing 10. As a result, the second electrode 16 and the third electrode 22 form a capacitor.

[0025] The opposing second electrode 16 and third electrode 22 form a capacitor. The capacitance of this capacitor depends on the distance between the electrodes, so the portion of the coupling portion 20 having at least the third electrode 22 is fixed in position relative to the housing 10, thereby fixing the capacitance. The housing 10 (connection portion 15) may be locally thin at the portion corresponding to the second electrode 16. The dielectric constant of the insulating member housing 10 corresponds to the capacitance of the capacitor, so the housing 10 may be made of a material with a higher dielectric constant than conventional materials (such as general polymer resins (dielectric constant of approximately 3.6)), such as polycarbonate (dielectric constant 6.4). A coating made of a material with a high dielectric constant may be provided between the second electrode 16 and the third electrode 22. In this case, the dielectric constant must be sufficiently high compared to the thickness of the coating (the increase in the distance between the electrodes) in order to increase the capacitance of the capacitor.

[0026] In this way, by configuring the second electrode 16 and the third electrode 22 so that they do not need to be directly connected by a conductor line, there is no need for the conductor line to penetrate the housing 10, and accordingly there is no need to take measures to prevent sealing leaks, particularly watertightness, in the housing 10. Furthermore, since there is no need to expose electrical wiring between the main body 1 and the belt 2 or to connect it directly with a terminal or the like, problems due to disconnection during use do not occur, and the configuration is not significantly more complicated than conventional configurations.

[0027] As described above, the wearing measurement unit 18 measures the capacitance of this capacitor and outputs the result to the CPU 13. Based on the capacitance measurement result, the CPU 13 determines whether or not the wrist-worn terminal device 100 is worn on the arm. The determination result may be used, for example, to control whether or not the pulse sensor is operating. The determination result may also be used to control switching of the display state by the display unit 12 (for example, changing to a display state that indicates relatively low energy consumption when the device is not worn).

[0028] FIG. 3 is a diagram showing the route of the signal line 23 on the belt 2. As shown in FIG. 3(a) is a perspective view of the connecting part 20, FIG. 3(b) is a plan view of the connecting part 20 seen from above (the side of the display screen 12a of the main body 1), and FIG. 3(c) is a bottom view of the connecting part 20 seen from below (the side of the back cover 14 of the main body 1). The Y direction is the direction away from the main body 1 (connecting part 15), and the relative positions of the protrusion extending in the Z direction and the connecting part 15 are determined by a pin, a screw, or the like.

[0029] Here, the signal line 23 may be located along the surface of the belt 2, and connects the first electrode 21 and the third electrode 22 by going around the side of the connecting part 20 away from the main body part 1 (the +Y side, the opposite side). This allows the signal line 23 to have as little capacitance as possible between it and the second electrode 16 of the main body part 1. Note that although this slightly increases the amount of work (processes) required in manufacturing, the signal line 23 may also connect the first electrode 21 and the third electrode 22 by passing through the connecting part 20 in the Z direction.

[0030] With the above configuration, a fixed capacitance (second capacitor) between the second electrode 16 and the third electrode 22 and a variable capacitance (first capacitor) between the first electrode 21 and the ground surface are arranged in series between the attached measurement unit 18 and the ground surface.

[0031] When the wrist-worn terminal device 100 is worn on the arm A and the inner surface of the belt 2 comes into contact with (close to) the arm A, the capacitance of the first capacitor increases, and the combined capacitance of the first and second capacitors also increases. As a result, when a predetermined voltage is applied to the second electrode 16 by the wear measurement unit 18, the amount of charge flowing to the second electrode 16 increases, and by directly or indirectly detecting this change in the amount of charge, it is possible to determine whether the device is being worn. The determination may be made periodically, or a period for making the determination may be determined based on the measurement results of another sensor such as an acceleration sensor.

[0032] The capacitance of the second capacitor is affected by clothing, gloves, and other items that may be caught between the device and the arm when it is worn on the arm, and is affected by the distance from the arm to the surface on which the wrist-worn terminal device 100 is placed in various positions and the material of the surface when it is not worn on the arm. The criteria for judgment are set so that changes in the amount of charge due to these effects can be determined.

[0033] FIG. 4 is a diagram showing the positional relationship between the placement surface P and the first electrode 21 when the wrist-worn terminal device 100 is removed from the arm and placed on the placement surface P. As shown in FIG.

[0034] In this wrist-worn terminal device 100, as shown in FIG. 4(a), when the main body 1 is placed so that its side is in contact with the mounting surface P (the surface on the back cover 14 side of the wrist-worn terminal device 100 is shown here), the first electrode 21 is spaced apart from both ends in the width direction perpendicular to the extension direction of the strap 2, and is located approximately in the center of the main body 1, inside both ends in the width direction. As a result, when the wristwatch is placed sideways on the mounting surface P, the distance dw between the first electrode 21 and the mounting surface P is sufficiently larger than the distance from the arm A when the wristwatch is worn on the wrist. In particular, when the mounting surface P is a metal plate, the capacitance of the first capacitor increases in inverse proportion to the distance between the first electrode 21 and the mounting surface P. Therefore, in a configuration in which the position of the first electrode 21 can be very close to the mounting surface P (for example, within 1 cm), it is easy for an erroneous determination that the watch is being worn on the arm A to occur. However, the position of the first electrode 21 described above can reduce the occurrence of such an erroneous determination. In wrist-worn terminal device 100 having a pulse sensor using reflective photoplethysmography, light-emitting measurement surface S is located on back cover 14, and when measuring the pulse, measurement light (for example, light with a wavelength of 550 nm) is emitted from light-emitting measurement surface S. By accurately determining whether or not the device is attached to the arm in this way, it is possible to prevent measurement light from light-emitting measurement surface S from unnecessarily irradiating the surrounding area when the device is not attached to the arm. As shown in FIG. 4(a), if the width of the wrist-worn terminal device 100 is greater than the width of the belts 2 and 3 and the distance dw is sufficient, the first electrode 21 does not need to be located near the center in the width direction.

[0035] According to such a positional relationship, the first electrode 21 may be made small in size or may have a shape (longitudinally long) along the direction in which the belt 2 extends.

[0036] 4(b), the belts 2 and 3 are connected to the connection portion 15 so as to curve upward toward the inner periphery of the belts 2 and 3 and have rigidity and / or elasticity so that when the wrist-worn terminal device 100 is placed with its upper surface (display screen 12a) facing the placement surface P, the first electrode 21 (together with the third electrode 22) is maintained apart from the placement surface P (so as not to bend naturally due to the weight of the belts 2 and 3 and come into contact with the placement surface P). This keeps the third electrode 22 and the first electrode 21 of the belt 2 out of contact with or close to the placement surface P. At the same time, the belt 2 (and belt 3) do not come into contact with or close to the main body 1 of the wrist-worn terminal device 100, so that the first electrode 21 is not close to the ground surface, electronic circuits, various conductive components, etc. within the housing 10. Furthermore, the distance between the first electrode 21 and the third electrode 22 does not change substantially (it may deform if a force significantly greater than that during normal use is applied), and this size is kept greater than the distance between the first electrode 21 and both ends of the width direction, thereby preventing the capacitance from changing significantly due to factors other than whether or not the device is worn on the arm.

[0037] Furthermore, by using a material with a lower dielectric constant for the connecting portion 20, particularly the material near the first electrode 21, than conventional materials or other portions (for example, polyamide (relative dielectric constant: 3.6)), it is possible to further reduce the degree of electrical coupling with surrounding objects such as the placement surface P. An example of such an insulating material is polytetrafluoroethylene (PTFE, relative dielectric constant: 2.1). As described above, in the wrist-worn terminal device 100 of this embodiment, the dielectric constant of the housing 10 is higher than the dielectric constant of the belts 2 and 3 (including the connecting portions 20 and 30).

[0038] As described above, the wrist-worn terminal device 100 of this embodiment comprises the main unit 1 and the belts 2 and 3 for fixing the main unit 1 to the arm A. The belt 2 is made of an insulating material over at least a certain range from the end connected to the main unit 1, and has a first electrode 21 located inside both ends of the main unit 1 in the width direction perpendicular to the extension direction of the belt 2 and within the certain range along the surface facing the arm A, and the main unit 1 has a wearing measurement unit 18 that measures the capacitance of the first electrode 21. In this way, in wrist-worn terminal device 100, which uses changes in capacitance to determine whether or not the device is attached to arm A, by positioning the electrode that detects whether or not the device is attached along the side of belt 2 facing arm A and on the inside, away from both ends in the width direction of belt 2, it is possible to easily separate first electrode 21 from the placement surface P when not attached to arm A, and therefore, with this wrist-worn terminal device 100, detection of whether or not the device is attached can be made less susceptible to the influence of the placement surface P and main body 1. This allows wrist-worn terminal device 100 to detect whether or not the device is attached to the arm more reliably than before.

[0039] Furthermore, the wrist-worn terminal device 100 includes a CPU 13 that determines whether or not the belt 2 (own device) is worn on the user's wrist based on the capacitance measurement result by the wearing measurement unit 18. In this way, the above-described electrode arrangement allows the CPU 13 to make a more accurate determination, and various operational controls of the wrist-worn terminal device 100 by the CPU 13 can also be efficiently switched depending on the determination result.

[0040] The main body 1 also has a housing 10 and a second electrode 16 located inside the housing 10 and connected to the wearing measurement unit 18. The belt 2 also has a connecting part 20 connected to the main body 1 and a third electrode 22 electrically connected to the first electrode 21 and located on the connecting part 20 opposite the second electrode 16 with the housing 10 in between. In this way, instead of directly connecting the wearable measurement unit 18 in the housing 10 to the first electrode 21, the housing 10 is sandwiched between the second electrode 16 and the third electrode 22 to form a capacitor, eliminating the need to provide a through-hole in the housing 10. This eliminates the need for measures to prevent a decrease in water resistance due to through-holes, and can suppress increases in costs and the labor involved in the manufacturing process compared to conventional methods. Furthermore, since there is no need to directly connect a signal line between the main body 1 and the belt 2, poor contact or disconnection of the signal line exposed at the connection between the main body 1 and the belt 2 can be reduced.

[0041] The above-mentioned certain range also includes the connecting portion 20. By making the connecting portion 20 have a lower dielectric constant than the conventional normal belt 2 portion, it is possible to further reduce the coupling strength between the first electrode 21 and parts other than the arm A in close proximity, thereby reducing changes in capacitance due to environmental factors such as the placement surface P. This allows the wrist-worn terminal device 100 to more stably determine whether or not it is being worn on the arm A.

[0042] Furthermore, the distance between the first electrode 21 and the third electrode 22 is equal to or greater than the distance between the first electrode 21 and both ends of the belt 2 in the width direction. This means that the influence of changes in the measured capacitance due to direct interaction between the first electrode 21 and the second electrode 16 and the third electrode 22, which are positioned in a substantially fixed manner, does not need to be taken into consideration, and therefore the wrist-worn terminal device 100 can more stably measure the capacitance and determine whether or not the device is worn on the wrist.

[0043] Furthermore, signal line 23 electrically connecting first electrode 21 and third electrode 22 is positioned along the surface of belt 2 and passes through the side of connecting part 20 opposite to the side facing main body 1. This allows signal line 23 to be routed as far away as possible from third electrode 22 and second electrode 16, thereby suppressing the influence of changes in capacitance between signal line 23 and second electrode 16.

[0044] In addition, the main body 1 has a display surface, and the belt 2 has a connecting part 20 that is connected to the main body 1, and has rigidity or elasticity such that the belt 2 does not come into contact with the mounting surface P when the device is placed on the mounting surface P with the display surface side of the main body 1 in contact with the mounting surface P. In other words, by increasing the elasticity and / or rigidity of the belt 2, the belt 2 is prevented from naturally bending and coming close to or into contact with the placement surface P when the wrist-worn terminal device 100 is worn, thereby reducing the influence of the surrounding environment on the capacitance detected by the first electrode 21 located on the belt 2, and therefore the wrist-worn terminal device 100 can more stably determine whether or not it is worn on the arm A.

[0045] Furthermore, the housing 10 may have a higher dielectric constant than the belt 2. This increases the capacitance of the capacitor formed by the second electrode 16 and the third electrode 22 sandwiching the housing 10 in the wrist-worn terminal device 100, making it easier to detect changes in the capacitance related to the first electrode 21.

[0046] Furthermore, the dielectric constant of the connecting portion 20 of the belt 2 may be lower than that of other portions. This weakens the bond between the first electrode 21 and the surrounding area other than the arm, reducing changes in capacitance due to factors other than the arm, and enabling the wrist-worn terminal device 100 to more stably determine whether the device is being worn or not.

[0047] The present invention is not limited to the above-described embodiment, and various modifications are possible. For example, the shapes of the first electrode 21, the second electrode 16, and the third electrode 22 are not limited to a rectangular shape in a plan view, and may have any different shape that can function as a capacitor, depending on the positional relationship with other components, the area that can be occupied, and the like.

[0048] Furthermore, in the above embodiment, the second electrode 16 and the third electrode 22 are opposed to each other to sandwich the housing 10 to form a capacitor, so that the signal lines 17 and 23 do not penetrate the housing 10, but they may penetrate the housing 10. In this case, the through holes may be filled as necessary to ensure water resistance, pressure resistance, and dust resistance.

[0049] The route of the signal line 23 shown in the above embodiment is merely an example, and any other appropriate route may be used. The portion of the signal line 23 located on the surface of the belt 2 may be covered with a protective film or the like as appropriate.

[0050] Furthermore, in the above embodiment, the rigidity and / or elastic modulus of the belts 2, 3 have been described as being high enough to bend naturally and not come close to or into contact with the placement surface P, but when the first electrode 21 is located at the connecting part 20, the parts other than the connecting part 20 may be soft and have a low elastic modulus. Also, when the first electrode 21 is located at a position where it is reliably fixed and supported near the connecting part with the connecting part 15 of the connecting part 20, the elastic modulus does not need to be high as long as its position does not change significantly due to the influence of gravity when the device is not being worn.

[0051] In the above embodiment, the materials of the connecting portion 20 and the housing 10 are described as being different from conventional materials, but they may be made of the same materials as conventional materials. Furthermore, the materials of the belts 2 and 3 in the connecting portion 20 and other portions may be the same or different.

[0052] Furthermore, in the above embodiment, the first electrode 21 is described as being located at the connecting portion 20, but this is not limited to this. The first electrode 21 may be located inside the belt 2, outside the connecting portion 20. Furthermore, the connecting portion 20 may be configured integrally with the belt 2, and the first electrode 21 may be located within a certain range (a range corresponding to the connecting portion 20) from the connection side of the main body 1.

[0053] Furthermore, the wrist-worn terminal device 100 is not limited to one having a digital display screen 12a, but may be an analog display type wrist-worn terminal device 100 in which pointers, rotating disks, etc. are exposed from the display surface and display is performed according to the indicated positions of these. In addition, the specific configurations, structures, materials, etc. shown in the above embodiments can be modified as appropriate within the scope of the present invention.

[0054] Although several embodiments of the present invention have been described, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and its equivalents. The inventions described in the claims originally attached to this application are as follows. The claim numbers described in the appendix are the same as those of the claims originally attached to this application.

[0055] [Note] <Claim 1> The device comprises a main body and a belt for fastening the main body to an arm, the belt is made of an insulating material over at least a certain range from the end connected to the main body, and has a first electrode located inside both ends of the main body in a width direction perpendicular to the extending direction of the belt and within the certain range along a surface facing the arm; The main body has a measuring unit that measures the capacitance associated with the first electrode. Wrist-worn terminal device. <Claim 2> 2. The wrist-worn terminal device according to claim 1, further comprising a determination processing unit that determines whether the belt is worn on the user's arm based on the capacitance measurement result by the measurement unit. <Claim 3> the main body unit has a housing and a second electrode located inside along the housing and connected to the measurement unit, The belt has a connecting portion connected to the main body portion, and a third electrode electrically connected to the first electrode and positioned on the connecting portion opposite the second electrode with the housing interposed therebetween. 3. The wrist-worn terminal device according to claim 1 or 2. <Claim 4> 4. The wrist-worn terminal device according to claim 3, wherein the certain range includes the connecting portion. <Claim 5> 5. The wrist-worn terminal device according to claim 3, wherein the distance between the first electrode and the third electrode is equal to or greater than the distance between the first electrode and both ends of the first electrode. <Claim 6> 5. A wrist-worn terminal device according to claim 3 or 4, wherein a signal line electrically connecting the first electrode and the third electrode is positioned along the surface of the belt and passes through the side of the connecting portion opposite the side facing the main body portion. <Claim 7> the main body portion has a display surface, The wrist-worn terminal device according to any one of claims 1 to 6, wherein the belt has a connecting portion that is connected to the main body portion, and has a rigidity or elasticity such that the belt does not come into contact with the placement surface when the main body portion is placed on the placement surface with the display surface side in contact with the placement surface. <Claim 8> 7. The wrist-worn terminal device according to claim 3, wherein the housing has a higher dielectric constant than the belt. <Claim 9> 9. The wrist-worn terminal device according to claim 3, wherein the belt has a lower dielectric constant at the connecting portion than at other portions. [Explanation of symbols]

[0056] 1 Main body 2, 3 belts 10. Cabinet 11 Circuit Board 12 Display section 12a display screen 13 CPU 14 Back cover 15 Connection 16 Second electrode 17 Signal line 18 Wearable measurement unit 19 Windshield 20, 30 connection part 21 First electrode 22 Third electrode 23 Signal line 100 Wrist-worn terminal device A Arm P Placement surface S Light emission measurement surface

Claims

1. a main body; a belt for fastening the main body to the arm; Equipped with the belt is made of an insulating material over at least a certain range from the end connected to the main body, and has a first electrode located inside both ends of the main body in a width direction perpendicular to the extending direction of the belt and within the certain range along a surface facing the arm; the main body portion has a housing, a measuring unit that measures a capacitance related to the first electrode, and a second electrode that is located inside along the housing and connected to the measuring unit, the belt has a connecting portion connected to the main body portion, and a third electrode electrically connected to the first electrode and positioned on the connecting portion opposite the second electrode with the housing interposed therebetween; a determination processing unit that determines whether the belt is worn on the user's arm based on a measurement result of the capacitance by the measurement unit, Wrist-worn terminal device.

2. The wrist-worn terminal device according to claim 1, wherein the certain range includes the connecting portion.

3. 3. The wrist-worn terminal device according to claim 1, wherein the distance between the first electrode and the third electrode is equal to or greater than the distance between the first electrode and both ends of the first electrode.

4. 3. A wrist-worn terminal device according to claim 1, wherein a signal line electrically connecting the first electrode and the third electrode is positioned along the surface of the belt and passes through the side opposite the side of the connecting portion facing the main body portion.

5. the main body portion has a display surface, The belt has a connecting portion that is connected to the main body portion, and has a rigidity or elasticity that prevents the belt from coming into contact with the placement surface when the main body portion is placed on the placement surface with the display surface side in contact with the placement surface. A wrist-worn terminal device as described in any one of claims 1 to 4.

6. 5. The wrist-worn terminal device according to claim 1, wherein the housing has a higher dielectric constant than the belt.

7. 7. The wrist-worn terminal device according to claim 1, wherein the belt has a lower dielectric constant at the connecting portion than at the other portions.

Images