JP2013061308A - Wrist device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wrist device that can maintain or improve reception performance even if it is downsized.SOLUTION: An electronic wrist watch 1 as a wrist device has an antenna part 2 for receiving a radio wave, a display part including a liquid crystal panel part 4, and at least one wiring board 20 and can be fitted to a wrist 8. While being fitted to the wrist 8, the antenna part 2 is provided between a wiring board 20 arranged on the wrist side of the liquid crystal panel part 4 and closest to the liquid crystal panel part 4, and the wrist 8.

Description

  The present invention relates to a wrist device incorporating a device having an antenna function.

  Conventionally, a portable receiver shown in Patent Document 1 has been disclosed as a wrist device incorporating an antenna function. This portable receiving device has a digital circuit part constituting a part of a receiving circuit and a receiving antenna on one surface of a sandwich structure wiring board in which an electromagnetic shielding layer is inserted between both front and back surfaces, On the other surface of the substrate, there is an analog circuit portion that faces the receiving antenna via the wiring substrate and constitutes another part of the receiving circuit. In the portable receiver having this configuration, the analog circuit part that is susceptible to noise is electromagnetically shielded by the electromagnetic shielding layer interposed in the wiring board with respect to the digital circuit part that is the source of high-frequency digital noise. This electromagnetic shielding effectively suppresses leakage and mixing of noise components from the digital circuit section to the analog circuit section. Therefore, portable receivers can be miniaturized by arranging the digital circuit part and the analog circuit part close to each other, and can further reduce the size and reduce the influence of noise. Can be improved.

Japanese Patent Laid-Open No. 10-197662

  However, in the conventional technique, it is possible to suppress the influence of the digital circuit unit and achieve downsizing of the portable receiving device. However, when further downsizing is desired, the general technique shown in Patent Document 1 is used. In a simple configuration, that is, a configuration in which a display unit such as a liquid crystal panel is connected to the receiving antenna side with a flat cable, the impedance changes due to the influence of the liquid crystal panel or the flat cable on the receiving antenna and the radiation efficiency deteriorates There was a problem that the above occurred.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following application examples or forms.

  Application Example 1 A wrist device according to this application example includes an antenna unit that receives radio waves, a display unit that includes a liquid crystal panel unit, and at least one wiring board, and can be worn on an arm. The antenna unit is provided between the arm and the wiring board that is disposed on the arm side of the display unit and is closest to the display unit in a state where the antenna unit is mounted on the arm. Features.

  According to the wrist device of this application example, when there is one wiring board, the wiring board is arranged on the arm side with respect to the display unit, and the antenna unit is arranged at a position on the arm side from the wiring board. In addition, when there are a plurality of wiring boards, the wiring board closest to the display unit among the wiring boards arranged on the arm side of the display unit is the corresponding board, and the arm side with respect to the corresponding wiring board is The antenna unit is disposed at the position. For example, if another board or component is arranged in layers between the corresponding wiring board and the arm, the antenna unit is inserted into any of the layers. In the wrist device having such a configuration, since the antenna unit and the display unit are not arranged on the same surface side of the wiring board as in the conventional example, the influence of a flat cable or the like that connects the display unit or the display unit to the antenna unit. The reception performance can be maintained and improved even when the device is downsized.

  Application Example 2 In the wrist device described in the application example, it is preferable that the antenna unit has the same size as the wiring board and the display unit.

  According to this configuration, the display unit is not configured to protrude in a bowl shape with respect to the antenna unit, and thus, at the end of the antenna unit, the display unit is hardly affected. It is possible to sufficiently form an electromagnetic field. Therefore, the wrist device can maximize the reception performance.

  Application Example 3 In the wrist device described in the application example, the antenna unit includes a radiation electrode for receiving the radio wave, a ground electrode that is an electrode to which power is supplied, and the radiation electrode and the ground electrode. It is preferable that the radiation electrode is disposed in the direction of the arm.

  According to this configuration, the radiation electrode of the antenna unit is arranged in the direction of the arm, whereby the ground electrode is oriented in the direction of the wiring board. In the antenna unit, in order to maximize the area of the radiation electrode, a so-called feeding point for supplying power is provided on the side of the ground electrode instead of the radiation electrode that receives radio waves. In this configuration, since the ground electrode is directed toward the wiring board, and the ground electrode and, for example, the ground terminal of the wiring board face each other, each connection can be easily performed. . In this case, a part of the radio wave to be received is once reflected by the arm, and then reflected by the radiation electrode of the antenna unit.

  Application Example 4 In the wrist device described in the application example, it is preferable that the radiation electrode and the ground electrode have the same shape.

  According to this configuration, if the radiation electrode is square, the ground electrode is also square, and if the radiation electrode is round, the ground electrode is round. Yes. If the radiation electrode and the ground electrode have the same shape through the dielectric layer, the antenna unit can receive radio waves efficiently. In this case, in addition to the same shape as the ground electrode, the radiation electrode preferably has the same or smaller size as the ground electrode.

The schematic diagram which shows the outline | summary of a GPS system. FIG. 3 is a cross-sectional view illustrating a configuration including an antenna unit in the electronic wristwatch according to the first embodiment. FIG. 3A is a plan view showing a configuration of a liquid crystal panel unit, and FIG. The block diagram which shows the circuit structure of an electronic wristwatch. (A) The top view which looked at the antenna part from the ground electrode side, (b) Sectional drawing which shows the electric power feeding structure to an antenna part, (c) The top view which shows the excitation mode in the discharge electrode of an antenna part. Sectional drawing which shows the antenna part structure in the electronic wristwatch of Embodiment 2. FIG.

  Hereinafter, a preferred example of the wrist device of the present invention will be described with reference to the accompanying drawings. Here, an outline will be described by taking as an example a wrist device adapted to a communication system that receives and uses a positioning signal or the like by radio waves from a position information satellite or the like. This communication system is a so-called GPS (Global Positioning System) system.

  FIG. 1 is a schematic diagram showing an outline of a GPS system. As shown in FIG. 1, a GPS satellite 90 is a position information satellite orbiting a predetermined orbit above the earth. For example, a satellite signal obtained by superimposing a navigation message or the like on a 1.57542 GHz microwave is used. Sending to the ground. The GPS satellite 90 is equipped with an atomic clock, and the satellite signal includes GPS time information which is extremely accurate time information measured by the atomic clock. Therefore, the electronic wristwatch (list device) 1 having a function as a GPS receiver can display the accurate time by receiving the satellite signal and correcting the advance or delay of the internal time. This correction is performed as a time measurement mode.

The satellite signal includes orbit information indicating the position of the GPS satellite 90 in the orbit. In other words, the electronic wristwatch 1 can also perform positioning calculation. Normally, by receiving satellite signals transmitted from four or more GPS satellites 90, orbital information and GPS time information contained therein are used. And has a function of performing positioning calculation. By the positioning calculation, the electronic wristwatch 1 can easily correct the time difference in accordance with the current position, and this correction is performed as a positioning mode. In addition, the satellite signal can be used for various applications such as displaying the current position, measuring the moving distance, and measuring the moving speed. In the electronic wristwatch 1, the liquid crystal panel unit 4 serving as a display unit receives these pieces of information. Can be digitally displayed.
(Embodiment 1)

  Embodiment 1 demonstrates an example of the structure about the electronic wristwatch 1 provided with the GPS receiving function. FIG. 2 is a cross-sectional view illustrating a configuration including an antenna unit in the electronic wristwatch according to the first embodiment. As shown in FIGS. 2 and 1, the electronic wristwatch 1 with a GPS reception function is made of a metal such as stainless steel or titanium, or a resin such as plastic, and in this case, an outer case 11 formed of plastic (polycarbonate resin). And a belt 19 for attaching the outer case 11 to the arm 8. The exterior case 11 is formed in a substantially cylindrical shape, and has a glass 12 attached to an opening on the surface side on which information such as time is visually recognized, and a back surface on the arm 8 side on which the electronic wristwatch 1 is attached. The back cover 13 attached to the side and the buttons 16a, 16b, and 16c (FIG. 1) provided on the side surface of the exterior case 11 are provided. These buttons 16 (16a, 16b, 16c) are configured to be able to set display on the liquid crystal panel unit 4 by manual operation.

  The exterior case 11 has a drive mechanism for processing such as ticking time, a processing mechanism for processing information and displaying processed information, and the like. A support frame 15 is provided to support. The support frame 15 has a liquid crystal panel unit 4 for displaying various information such as time, and a receiving module 30 and a control unit 40, which will be described later with reference to FIG. In order to receive radio waves from the wiring board 20 that is located closest to the liquid crystal panel unit 4 among the other boards, the shield part 21 that shields the receiving module 30, the control part 40, etc., and the GPS satellite 90 The antenna unit 2 and the battery 18 as a power supply source of the electronic wristwatch 1 are supported. In the electronic wristwatch 1, the antenna unit 2, the liquid crystal panel unit 4, and the wiring board 20 are substantially the same size, that is, have a substantially congruent rectangular shape, and the outer periphery is accommodated inside the support frame 15 having a substantially circular shape. ing. A protrusion (not shown) for alignment with the outer case 11 is provided on the outer periphery of the support frame 15, and the liquid crystal panel unit 4 is installed at a predetermined position with respect to the outer case 11. ing. It is more preferable that the antenna unit 2, the liquid crystal panel unit 4, and the wiring board 20 have the same size, that is, congruence.

  The liquid crystal panel unit 4 is connected to the surface of the wiring board 20 on the surface side opposite to the antenna unit 2 via the flexible substrate 4n. The antenna unit 2 includes, in order from the battery 18 side, a radiation electrode 2a, a dielectric layer 2b, and a ground electrode 2c, and feeds the reception module 30 to a feed point 2d provided on the ground electrode 2c side. The unit 70 is configured to supply high-frequency power. A connector 25 is provided at the feeding point 2d, and is connected to the back side of the wiring board 20 facing the feeding point 2d by a lead wire 26. That is, it can be said that the antenna unit 2 has a configuration in which the antenna unit 2 and the wiring substrate 20 can be easily connected because the feeding point 2d is disposed to face the wiring substrate 20. The ground electrode 2c is preferably the same size as the radiation electrode 2a, but may be set larger than the radiation electrode 2a. Further, it is preferable to provide a gap of 2 mm between the outer edge wall of the dielectric layer 2 b and the outer case 11. The detailed configuration and reception function of the antenna unit 2 will be described in detail later with reference to FIG.

  Next, the liquid crystal panel unit 4 will be described. FIG. 3A is a plan view showing the configuration of the liquid crystal panel unit, and FIG. 3B is a cross-sectional view showing the configuration of the liquid crystal panel unit. FIG. 3B is a cross-sectional view taken along P-P ′ in FIG. 3A and 3B, the liquid crystal panel unit 4 includes a transparent substrate 4a and a counter substrate 4b paired with the transparent substrate 4a, which are bonded together by a sealing material 4c as a sealing material. It is the composition which is. That is, the sealing material 4c forms a closed space region in both substrate surfaces.

  Then, the liquid crystal panel unit 4 switches a plurality of pixel electrodes (pixels) 4d arranged on the surface of the transparent substrate 4a and each pixel electrode 4d inside the frame-shaped region by the sealing material 4c and having a mosaic shape or the like. A TFT (Thin Film Transistor) 4e to be controlled, a planar counter electrode 4f disposed on the surface of the counter substrate 4b on the transparent substrate 4a side facing the pixel electrode 4d, and the pixel electrode 4d and the counter electrode 4f are covered. In the direction of the liquid crystal 4h provided on the opposite side of the TFT 4e in the transparent substrate 4a, the liquid crystal 4h sealed and held in the region partitioned by the sealing material 4c and the alignment film 4g. And a light source unit 4j that emits white light 10 toward the surface. The pixel electrode 4d, TFT 4e, counter electrode 4f, and alignment film 4g are formed of a transparent member. The liquid crystal 4h displays various kinds of information by transmitting or blocking the light 10 from the light source unit 4j corresponding to the pixel electrode 4d whose switching is controlled by the TFT 4e. That is, the liquid crystal panel unit 4 is a so-called transmissive liquid crystal display device. In addition, the liquid crystal panel unit 4 includes a flexible substrate 4n for connection to the outside via the terminal unit 4m, and the flexible substrate 4n is connected to the surface of the wiring substrate 20 (FIG. 2) on the liquid crystal panel unit 4 side. Has been. Here, as the light source unit 4j, an organic EL (organic electroluminescence) is used to supply light to the liquid crystal 4h via the pixel electrode 4d. It is possible to eliminate the pixel electrode 4d. In this case, the organic EL is arranged at the position where the pixel electrode 4d is located, and the organic EL is individually switched. Further, the light source unit 4j may be configured to guide light from a light source lamp to the entire surface of the liquid crystal 4h with a light guide plate, for example.

  In the liquid crystal panel unit 4, depending on the type of liquid crystal 4h to be used, that is, depending on the operation mode such as TN (Twisted Nematic) mode, STN (Super Twisted Nematic) mode, normally white mode or normally black mode. A retardation plate, a polarizing plate, and the like are arranged in a predetermined direction, but are not shown here. When the liquid crystal panel unit 4 is configured for color display, a red (R), green (G), and blue (B) filter is provided in a region facing each pixel electrode 4d in the counter substrate 4b. Just do it. Further, in the liquid crystal panel unit 4, a reflection plate is provided on the liquid crystal side of the transparent substrate 4a in place of the light source unit 4j, and the light reflected from the counter substrate 4b side is reflected, that is, a so-called reflective liquid crystal display device. Is also possible.

  Next, a circuit configuration of the electronic wristwatch 1 having a GPS reception function will be described. FIG. 4 is a block diagram showing a circuit configuration of the electronic wristwatch. As shown in FIG. 4, the electronic wristwatch 1 includes an antenna unit 2, a receiving module 30, a display unit 80 including a control unit 40, and a battery 18.

  The receiving module 30 is connected to the antenna unit 2 and includes a SAW (Surface Acoustic Wave) filter 35, an RF (Radio Frequency) unit 50, and a baseband unit 60. Has been. The SAW filter 35 performs a process of extracting a satellite signal from the radio wave received by the antenna unit 2. The RF unit 50 includes an LNA (Low Noise Amplifier) 51, a mixer 52, a VCO (Voltage Controlled Oscillator) 53, a PLL (Phase Locked Loop) circuit 54, an IF (Intermediate Frequency) amplifier 55, an IF A filter 56 and an ADC (A / D converter) 57 are included.

  The satellite signal extracted by the SAW filter 35 is amplified by the LNA 51, mixed with the clock signal output from the VCO 53 by the mixer 52, and down-converted to an intermediate frequency band signal. The PLL circuit 54 compares the phase of the clock signal obtained by dividing the output clock signal of the VCO 53 with the reference clock signal, and synchronizes the output clock signal of the VCO 53 with the reference clock signal. The signal mixed by the mixer 52 is amplified by the IF amplifier 55, and the high frequency signal is removed by the IF filter 56. The signal that has passed through the IF filter 56 is converted into a digital signal by an ADC (A / D converter) 57. The baseband unit 60 includes a DSP (Digital Signal Processor) 61, a CPU (Central Processing Unit) 62, an SRAM (Static Random Access Memory) 63, and an RTC (Real Time Clock) 64. The baseband unit 60 is connected to a crystal oscillation circuit with temperature compensation circuit (TCXO: Temperature Compensated Crystal Oscillator) 65, a flash memory 66, and the like.

  A crystal oscillation circuit (TCXO) 65 with a temperature compensation circuit generates a reference clock signal having a substantially constant frequency regardless of temperature, and the flash memory 66 stores current position information, time difference information, and the like. When set to the timekeeping mode or the like, the baseband unit 60 performs a process of demodulating the baseband signal from the digital signal converted by the ADC 57 of the RF unit 50. The baseband unit 60 acquires satellite information such as orbit information and GPS time information included in the navigation message of the captured GPS satellite 90 and stores it in the SRAM 63. In addition, the receiving module 30 is provided with a feeding unit 70 for feeding high-frequency power to the feeding point 2d (FIG. 2) of the antenna unit 2.

  The display unit 80 includes the control unit 40, the crystal resonator 43, and the like. The control unit 40 includes a storage unit 41, an oscillation circuit 42, and a drive circuit 44, and performs various controls. The control unit 40 controls the reception module 30, sends a control signal to the reception module 30, controls the reception operation of the reception module 30, and displays the display on the liquid crystal panel unit 4 via the drive circuit 44 in the control unit 40. Control. The storage unit 41 stores various types of information including internal time information.

  Here, the antenna unit 2 built in the electronic wristwatch 1 needs to receive satellite signals from a plurality of GPS satellites 90 (FIG. 1). Since the radio wave of the satellite signal transmitted from the GPS satellite 90 is so-called circularly polarized wave, the antenna unit 2 is preferably a patch antenna suitable for receiving this circularly polarized wave. It is preferable that it is a compact form so that it can be incorporated in Therefore, the electronic wristwatch 1 has a configuration in which the antenna portion 2 having a compact form as described below is inserted between the wiring board 20 and the battery 18, that is, the electronic wristwatch 1 is attached to the liquid crystal panel portion 4. The antenna unit 2 is provided between the wiring board 20 that is the closest board and the arm to which the electronic wristwatch 1 is to be attached.

  5A is a plan view of the antenna unit 2 as viewed from the ground electrode side, FIG. 5B is a cross-sectional view showing a power supply configuration to the antenna unit 2, and FIG. It is a top view which shows the excitation mode in a discharge electrode. As shown in FIG. 5, the antenna unit 2 includes a radiating electrode 2a that functions as a patch metal plate for a patch antenna, receiving a radio wave, a ground electrode 2c that faces the radiating electrode 2a, and a radiating electrode 2a and a ground. And a dielectric layer 2b sandwiched between the electrodes 2c. On the side of the ground electrode 2c of the antenna portion 2, a feeding point 2d that is a surface that is inserted through the dielectric layer 2b and connected to the radiation electrode 2a is provided. In this case, the feeding point 2d is 1 mm in length. It is circular and is insulated from the ground electrode 2c. Further, the portion through which the dielectric layer 2b is inserted has a cylindrical shape with a diameter of 0.5 mm. The connector 25 (FIG. 2) disposed at the feeding point 2d is connected to the radiation electrode 2a via the feeding point 2d and also to the ground electrode 2c. Then, lead wires 26 respectively connected to the radiation electrode 2a or the ground electrode 2c extend from the connector 25, and the radiation electrode 2a and the ground electrode 2c are electrically connected to the power feeding unit 70 via the wiring board 20. ing.

  The radiation electrode 2a has a rectangular shape (substantially square) having a triangular notch 2e at one corner, and is usually copper, aluminum, iron, gold, silver, palladium, indium tin oxide (ITO). However, in this case, it is formed by copper (Cu) plating having a thickness of 10 μm. At the same time, the portion through which the dielectric layer 2b is inserted is also formed by copper (Cu) plating. In the radiation electrode 2a, individual frequency adjustment can be easily performed by providing the trimming portion 2f obtained by partially scraping the copper (Cu) plating in the vicinity of the notch portion 2e. The ground electrode 2c has substantially the same rectangular shape as the radiation electrode 2a, and is formed at the same time including the feeding point 2d by copper (Cu) plating having a thickness of 10 μm. Thus, if the feed point 2d is on the ground electrode 2c side, the area of the radiation electrode 2a that receives radio waves can be maximized.

The dielectric layer 2b has a rectangular shape substantially the same size as the radiation electrode 2a, and usable materials include alumina (Al ₂ O ₃ ), mullite (3Al ₂ O ₃ .2SiO ₂ ), stearite ( MgO / SiO ₂ ), forsterite (2Mg ₂ O / SiO ₂ ), zirconia (PSZ), magnesia titanate (MgTiCO ₃ ) and the like. As the characteristics of the dielectric layer 2b, the dielectric constant is desirably 8 or more and 22 or less, and the dielectric loss tangent is desirably 0.001 or less. Therefore, in order to obtain these characteristics, the size of the dielectric layer 2b in the wrist device is desirably 2 cm to 4 cm on one side in the case of a rectangular shape like the electronic wristwatch 1. For reference, when the dielectric layer 2b is circular, the diameter is desirably 2.5 cm to 3.5 cm. In any case, the thickness is desirably 0.05 mm to 1.5 mm. In the electronic wristwatch 1, the dielectric layer 2b of the antenna unit 2 uses alumina (Al ₂ O ₃ ) having a rectangular shape with a thickness of 0.7 mm, a short side of 2.7 cm, and a long side of 3.2 cm. The alumina (Al ₂ O ₃ ) in this case has the characteristics that the dielectric constant is 17 and the dielectric loss tangent is 0.001. Further, the cutout portion 2e is set to have a cutout at a short side of 3 mm and a long side of 3.5 mm.

  Next, reception of radio waves including a positioning signal from the GPS satellite 90 by the antenna unit 2 having such a configuration will be described. The circularly polarized wave is used so that the radio wave from the GPS satellite 90 can be received even if the object to be received is facing an arbitrary direction like a moving body. Circular polarization is a form in which the direction of the electric field rotates with the passage of time. In general, an antenna can receive a radio wave when a current flows in the same direction as the electric field direction of the radio wave. Therefore, in order to receive circularly polarized waves, it is important to rotate the current flowing through the antenna as time passes. In order for the current flowing in the antenna to rotate, it is only necessary to generate an excitation having a phase difference of 90 degrees by passing the current in the orthogonal direction. In the antenna unit 2, the circularly polarized wave can be received by generating two excitation modes orthogonal to each other and having a phase difference of 90 degrees in the radiation electrode 2a as described below. .

  As shown in FIG. 5C, the antenna unit 2 is a pin feeding system that receives power feeding at the feeding point 2d. This method is simple because it can generate an excitation mode without using a special circuit element or the like in the power feeding system, and can easily receive circularly polarized waves. In the antenna unit 2 having such an arrangement, when high-frequency power is supplied from the power supply unit 70 to the radiation electrode 2a via the power supply point 2d, in this case, a current flows in the long-side direction through the radiation electrode 2a. An excitation mode F1 is generated, and in the direction orthogonal to the excitation mode F1, a current flows in the short side direction to generate the excitation mode F2. In other words, the feed point 2d can be set so that the excitation modes F1 and F2 as described above occur depending on the configuration of the antenna unit 2. At this time, the excitation mode F1 and the excitation mode F2 differ depending on the rectangular shape of the radiation electrode 2a, and the excitation mode F1 and the excitation mode are adjusted by adjusting the short side and the long side length and the trimming portion 2f. Control such as setting F2 to a different phase can be easily performed.

  Further, in the electronic wristwatch 1, the antenna unit 2 is the same as the outer shape of the liquid crystal panel unit 4, and the liquid crystal panel unit 4 does not protrude from the antenna unit 2 in the external direction. Therefore, the radiation electrode 2a can form an electromagnetic field at the end thereof with almost no influence of the liquid crystal panel unit 4. Thereby, the radiation electrode 2a can receive reliably the radio wave from the GPS satellite 90 as a receiving part. The same can be said for the case where the antenna unit 2 is larger than the outer shape of the liquid crystal panel unit 4.

As described above, the antenna unit 2 in the electronic wristwatch 1 of the first embodiment has the wiring board 20 disposed on the arm 8 side with respect to the liquid crystal panel unit 4, and the arm 8 side of the wiring board 20. The antenna unit 2 is disposed at the position. In the electronic wristwatch 1 having such a configuration, since the antenna unit 2 and the liquid crystal panel unit 4 are not arranged on the same surface side of the wiring board 20, the antenna unit 2 connects the liquid crystal panel unit 4 or the liquid crystal panel unit 4. Therefore, there is an advantage that the reception performance can be improved without being influenced by the flexible substrate 4n. Thereby, even when the electronic wristwatch 1 is downsized, it is possible to maintain at least the reception performance. Further, the antenna unit 2 is arranged so that the feeding point 2d on the ground electrode 2c side faces the wiring substrate 20 because the radiation electrode 2a faces the battery 18 side, that is, the arm 8 side. . Therefore, the antenna unit 2 and the wiring board 20 can be easily connected. When there are a plurality of wiring boards, among the wiring boards arranged on the arm 8 side with respect to the liquid crystal panel unit 4, the antenna unit is provided on the arm 8 side of the wiring board 20 closest to the liquid crystal panel unit 4. 2 will be arranged.
(Embodiment 2)

  Next, another form of the antenna unit 2 will be described. FIG. 6 is a cross-sectional view illustrating an antenna unit configuration in the electronic wristwatch of the second embodiment. In the antenna unit 2 in the second embodiment, the arrangement direction of the radiation electrode 2a and the ground electrode 2c is different from that in the first embodiment. Below, in the components which comprise the antenna part 2, the same code | symbol is provided to the thing with the same function, and only a different part from Embodiment 1 is demonstrated.

  As shown in FIG. 6, the antenna unit 2 of the electronic wristwatch 1 has a ground electrode 2c, a dielectric layer 2b, and a radiation electrode 2a in this order from the battery 18 side, and is a power feed provided on the ground electrode 2c side. High-frequency power is supplied from the power supply unit 70 of the receiving module 30 to the point 2d. A connector 25 is provided at the feed point 2d, and the lead wire 26 is connected to each of the feed point 2d and the ground electrode 2c. The antenna unit 2 is connected from the connector 25 to the wiring board 20 by a lead wire 26, and is connected to the power feeding unit 70 on the wiring board 20. According to this configuration, the lead wire 26 is longer than the configuration in the first embodiment, but the radiation electrode 2a of the antenna unit 2 faces the direction of the glass 12, and directly receives radio waves from the direction of the glass 12. can do.

  According to the antenna unit 2 in the electronic wristwatch 1 of the second embodiment, the wiring substrate 20 is disposed on the arm 8 side with respect to the liquid crystal panel unit 4, and the antenna unit 2 is influenced by the liquid crystal panel unit 4 or the flexible substrate 4n. In addition to the advantage that the reception performance can be improved due to the difficulty of receiving, the radiation electrode 2a faces the direction of the glass 12, so that radio waves can be received efficiently.

  The electronic wristwatch 1 that is the wrist device described above is not limited to each of the above-described embodiments, and the same effects as in any of the embodiments can be obtained even in the following modifications. It is done.

  (Modification 1) The antenna unit 2 and the liquid crystal panel unit 4 of the electronic wristwatch 1 are in the form of a rectangle, but are not limited to this form, and are in the form of a circle, an ellipse, or the like. It functions in the same way as the rectangular shape.

  (Modification 2) The radiation electrode 2a, the dielectric layer 2b, and the ground electrode 2c constituting the antenna unit 2 are not limited to an integrated configuration in which each is directly bonded, and any one of these The other board | substrate etc. may be inserted. Thereby, the antenna part 2 has flexibility in the installation configuration.

  (Modification 3) The notch portion 2e of the antenna part 2 is not limited to a triangular shape, and is formed in a concave shape from the outer edge toward the inner direction of the antenna part 2, or a shape protruding in a convex shape from the outer edge. It may be. Thus, the antenna unit 2 can be set flexibly in accordance with the design shape and the like of the electronic wristwatch 1.

  (Modification 4) In the setting where the antenna unit 2 is between the wiring board 20 and the arm 8, the antenna unit 2 is arranged on the outer surface side of the back cover 13, that is, on the surface facing the arm 8. Such a configuration is also included.

  (Modification 5) The wrist device is not limited to the electronic wristwatch 1, but also includes a travel clock, a pocket watch, and a watch attached to a portable electronic device having an antenna unit 2, and further has a clock function. It is also possible to apply to a portable terminal that does not exist. Further, the display unit is not limited to the liquid crystal panel unit 4 and may be a display using a display other than the liquid crystal, such as an organic EL (organic electroluminescence) or an EPD (Electro Phoretic Display). Can be mentioned.

  DESCRIPTION OF SYMBOLS 1 ... Electronic wristwatch as wrist device, 2 ... Antenna part, 2a ... Radiation electrode, 2b ... Dielectric layer, 2c ... Ground electrode, 2d ... Feeding point, 2e ... Notch part, 2f ... Trimming part, 4 ... Display part Liquid crystal panel part, 4n ... flexible board, 8 ... arm, 11 ... exterior case, 20 ... wiring board, 25 ... connector, 30 ... receiving module, 40 ... control part, 70 ... power feeding part, 90 ... GPS satellite.

Claims (4)

A wrist device having an antenna unit for receiving radio waves, a display unit including a liquid crystal panel unit, and at least one wiring board, and capable of being worn on an arm,
The antenna unit is provided between the arm and the wiring board that is disposed on the arm side of the display unit and is closest to the display unit while being mounted on the arm. And list equipment. The wrist device according to claim 1,
The wrist device, wherein the antenna unit is the same size as the wiring board and the display unit. The wrist device according to claim 1 or 2,
The antenna unit is
A radiation electrode for receiving the radio wave;
A ground electrode which is an electrode to which power is supplied;
A dielectric layer disposed between the radiation electrode and the ground electrode,
The wrist device, wherein the radiation electrode is arranged in the direction of the arm. The wrist device according to claim 3,
The wrist device, wherein the radiation electrode and the ground electrode have the same shape.

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