JP2013247599A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus in which reception performance can be maintained or enhanced, even if it is made compact.SOLUTION: An electronic wrist watch 1, as an electronic apparatus, is constituted to include an antenna 2 performing at least one of transmission and reception of radio waves, a liquid crystal panel 4 (display body) for displaying information, and at least one wiring board 20. The antenna 2 has a planar dielectric 2b, a ground electrode (first conductive layer) 2c arranged on one side of the dielectric 2b, and a radiation electrode (second conductive layer) 2a arranged on the other side. The ground electrode 2c is located on a side of the antenna 2 close to the wiring board 20, and connected with the signal potential thereof. The radiation electrode 2a is located on a side of the antenna 2 remote from the wiring board 20, and connected with the ground potential thereof. The wiring board 20 is interposed between the back of the liquid crystal panel 4 and the ground electrode 2c.

Description

  The present invention relates to an electronic device that is built in a device having an antenna function and is mainly used by being worn on a person or an animal.

  Conventionally, as an example of an electronic device that has an antenna function and is mounted on an arm, a portable receiving device disclosed in Patent Document 1 is disclosed. 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 such a configuration, that is, a display body such as a liquid crystal panel is connected to the receiving antenna side with a flat cable, the impedance of the receiving antenna varies due to the influence of the liquid crystal panel or the flat cable, and the radiation efficiency is reduced. There was a problem that deterioration and the like occurred.

  Further, in the conventional technique, the antenna, the display body portion, and the digital circuit are arranged side by side in a plane, and there is a problem that the area of the display body portion is limited. For this reason, in a high-performance and high-performance electronic device, not only a large amount of information cannot be displayed on the display unit, but also an external design of the exterior case in the electronic device is greatly restricted. This is due to a technical limitation that the conventional receiving antenna must be disposed near the surface of the outer case in order to receive radio waves. Furthermore, in an electronic device used by being attached to a human body or an animal, the transmission / reception characteristics of the antenna should not greatly vary depending on the wearing state.

  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 An electronic apparatus according to this application example includes an antenna unit for transmitting and receiving radio waves, a display body unit for displaying information, and at least one wiring board. The antenna unit includes a plate-shaped dielectric, a first conductive layer disposed on one surface of the dielectric, and a second conductive layer disposed on the other surface. The first conductive layer is located on a surface of the antenna unit on the side close to the wiring substrate and connected to the signal potential of the wiring substrate, and the second conductive layer is connected to the antenna unit. It is located on the surface far from the wiring board and connected to the ground potential of the wiring board, and the wiring board is disposed between the back surface of the display body and the first conductive layer. Features.

  According to the electronic device of this application example, the antenna unit is configured by the plate-like dielectric and the first conductive layer and the second conductive layer disposed on both sides thereof, and the display unit, the wiring board, and the antenna The parts can be placed one on top of the other. As a result, most of the upper surface side of the electronic device can be occupied by the display body, and a large amount of information can be displayed. In addition, it is possible to provide an appropriate shield layer on the wiring board disposed between the first conductive layer of the antenna unit and the display body unit, and to prevent noise generated by the display body unit from entering the antenna unit. be able to. Further, the second conductive layer on the side of the antenna portion that is remote from the wiring board is connected to the ground potential of the wiring board. As a result, the bottom surface of the electronic device attached to the human body or the like is shielded by the ground potential, and unstable elements due to changes in the wearing state can be reduced. In addition, the display unit and the wiring board are close to each other, making it easy to connect them. Electronic devices can also reduce the degree of influence of the wiring on the characteristics of the antenna unit, and maintain and improve transmission / reception performance. It is.

  Application Example 2 In the electronic device according to the application example described above, the connection between the antenna unit and the wiring board is such that the core wire at one end of the coaxial cable is on the surface of the antenna unit on the side close to the wiring board. Connected to the first conductive layer, the outer skin is connected to the second conductive layer through a through hole, and at the other end of the coaxial cable, the core wire is connected to the signal potential of the wiring board, and the outer skin is connected to the wiring board. It is preferably connected to the ground potential.

  According to this configuration, wiring to the second conductive layer far from the wiring board of the antenna unit is facilitated by using the coaxial cable. In other words, since the coaxial cable is on the surface of the antenna portion close to the wiring substrate, the length of the coaxial cable can be minimized and the antenna portion and the wiring substrate can be connected. As a result, loss and characteristic deterioration due to wiring to the antenna unit can be minimized, and transmission / reception performance can be maximized.

  Application Example 3 In the electronic device according to the application example described above, the connection between the antenna unit and the wiring board is performed by connecting the core wire at one end of the coaxial cable on the surface of the antenna unit on the side close to the wiring board. The outer skin is connected to the second conductive layer through a hole, and the outer skin is connected to the first conductive layer. At the other end of the coaxial cable, the outer skin is connected to the signal potential of the wiring board, and the core wire is connected to the wiring board. It is preferably connected to the ground potential.

  According to this configuration, wiring to the second conductive layer far from the wiring board of the antenna unit is facilitated by using the coaxial cable. In this case, since the core wire of the coaxial cable is used for connection to the ground potential of the second conductive layer, the characteristic disturbance due to the leakage current flowing between the first conductive layer of the antenna portion and the outer sheath of the coaxial cable is also It can be minimized. As a result, it is possible to maximize transmission / reception performance while minimizing loss and characteristic deterioration due to wiring to the antenna unit.

  Application Example 4 In the electronic device according to the application example described above, the connection between the antenna unit and the wiring board is performed by connecting the core wire at one end of the coaxial cable on the surface of the antenna unit on the side far from the wiring board. Connected to the first conductive layer through a hole and connected to the second conductive layer, and at the other end of the coaxial cable, the core wire is connected to the signal potential of the wiring board, and the outer cover is connected to the wiring board. It is preferably connected to the ground potential.

  According to this configuration, in the wiring connecting the antenna portion and the wiring board, it flows through the capacitance between the outer sheath of the coaxial cable and the second conductive layer of the antenna, or between the outer sheath of the coaxial cable and the ground potential of the wiring substrate. The occurrence of leakage current can be suppressed and its influence can be minimized. As a result, loss and characteristic deterioration due to wiring to the antenna unit can be minimized, and transmission / reception performance can be maximized.

  Application Example 5 In the electronic device according to the application example described above, the electronic device further includes a battery for supplying power, and the battery is disposed on a side opposite to the side on which the wiring board of the antenna unit is disposed. It is preferable that

  According to this configuration, since the battery that needs to be replaced can be placed near the surface of the outer case of the electronic device, the battery can be easily replaced. Since the second conductive layer on the battery side of the antenna unit is connected to the ground potential of the wiring board, even if the battery is placed at this position, the influence on the antenna characteristics is small and transmission / reception performance is not impaired.

  Application Example 6 In the electronic device according to the application example described above, the shape of the dielectric of the antenna unit and the shape of at least one of the first conductive layer and the second dielectric layer are n (n is 0, 1, 2, 3 or 4), and at least a short side of the rectangle is a conductor portion formed on the display body portion or the wiring board. It is preferable that the antenna is disposed on the outer side from the position that enters the inside of the larger outer edge by a length of two hundredths of the wavelength of the radio wave.

  According to this configuration, it is desirable that the display surface shape of the display body portion of the electronic device is rectangular, and if the antenna portion and the wiring board are also the same shape as the display body portion, each element is placed in the exterior case of the electronic device. It can be accommodated efficiently. When the electronic device is substantially rectangular or the like and the corners need to be rounded, the corners of the antenna unit and the wiring board may be appropriately cut off accordingly. When the antenna unit is a planar antenna, the magnetic current generated at the outer edge of the antenna unit determines the antenna performance. In this case, if the outer edge part of the antenna part is outside the position on the larger outer edge of the display body part or the wiring board from the inner edge by the 2 / 100th wavelength of the received radio wave, the antenna part is It has been confirmed by simulation that the performance can be maintained. Therefore, according to this configuration, it is possible to realize an electronic device that is compact and excellent in appearance design of the outer case without affecting the antenna performance.

  Application Example 7 In the electronic device according to the application example described above, the electronic device further includes a conductor larger than a maximum outer shape of any of the display body portion, the wiring board, and the antenna portion, It is preferable that the battery is disposed on the side opposite to the side on which the wiring board is disposed.

  According to this configuration, the conductor provided in the electronic device has an effect of ensuring the ground potential, for example, and can further stabilize the operation of the electronic device. The conductor may have a configuration in which a part of the outer case of the electronic device is formed of a conductive material such as metal.

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. (A) The top view which shows the structure of a liquid crystal panel part, (b) Sectional drawing which shows the structure of a liquid crystal panel part. 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. Sectional drawing which shows the antenna part structure in the electronic wristwatch of Embodiment 3. FIG.

  Hereinafter, a preferred example of the electronic 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 an electronic apparatus 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 (electronic 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, if satellite signals are used, various applications such as display of current position, measurement of moving distance, and measurement of moving speed are possible. 4 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, and FIG. 4 is a block diagram illustrating a circuit configuration of the electronic wristwatch. In FIG. 2, the scale is changed in the vertical and horizontal directions so that the structure, particularly in the vertical direction (thickness direction) can be clearly understood. As shown in FIGS. 2 and 1, an electronic wristwatch 1 with a GPS reception function includes an outer case 11 formed of a material that is not conductive and easily transmits radio waves, such as plastic (polycarbonate resin), and the outer case 11 has arms. 8 and a belt 19 for attaching to the belt. The exterior case 11 includes a glass 12 attached to the opening on the surface side on which information such as time is visually recognized, and a back lid 13 attached to the back side that is the side of the arm 8 to which the electronic wristwatch 1 is attached. And buttons 16a, 16b and 16c (FIG. 1) provided on the side surface of the outer case 11. The exterior case 11 has a substantially cylindrical appearance, but may be substantially rectangular parallelepiped (rectangular shape with rounded corners and sides), particularly in the case of digital display using a liquid crystal panel or the like. In many cases, the shape is a rectangular parallelepiped. 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 described later with reference to FIG. Receiving radio waves from the wiring board 20 that is located closest to the liquid crystal panel unit 4 among the other substrates in the figure, the shield unit 21 that shields the receiving module 30, the control unit 40, and the like, and the GPS satellite 90 For this purpose, the antenna unit 2 and the battery 18 that is the 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. Note that it is more preferable that the antenna unit 2, the liquid crystal panel unit 4, and the wiring board 20 have the same size and shape, that is, congruence, so that mounting efficiency is increased.

  And the liquid crystal panel part 4 is arrange | positioned on the opposite side to the antenna part 2 on both sides of the wiring board 20, and is connected to the drive circuit 44 (FIG. 4) mounted in the wiring board 20 via the flexible substrate 4n. The antenna unit 2 includes an electrode (second conductive layer) 2a, a plate-like dielectric plate (dielectric) 2b, and an electrode (first conductive layer) 2c in order from the battery 18 side. In addition, it is electrically connected to the power supply / reception point 4k on the electrode 2c side through a through hole provided in the dielectric plate 2b. The antenna unit 2 and the receiving module 30 (FIG. 4) are connected via the coaxial cable 25. A sheath at one end of the coaxial cable 25 is connected to the power supply / reception point 4k, and a core wire of the coaxial cable 25 is connected to the vicinity of the power supply / reception point 4k on the electrode 2c. The core wire at the other end of the coaxial cable 25 is connected to the SAW filter 35 through the signal terminal 36 for inputting the high-frequency signal of the receiving module 30 through the connector 26, and the outer skin is grounded to the wiring board 20 through the connector 26. Connected to potential.

  Since the antenna unit 2 is arranged such that the power supply / reception point 4k faces the wiring substrate 20, it can be said that the antenna unit 2 and the wiring substrate 20 are easily connected. Further, when the size of the antenna unit 2 is limited, the resonance frequency of the antenna becomes the lowest when the electrode 2c, the dielectric plate 2b, and the electrode 2a have the same size. Therefore, when the electrode 2c and the electrode 2a have the same size, the size of the antenna unit 2 is preferably the smallest, but the electrode 2c may be set larger than the electrode 2a or vice versa. This can be applied when finely adjusting the resonance frequency of the antenna unit 2. Further, when the outer case 11 has conductivity, it is preferable in terms of characteristics to provide a gap of 1/200 or more of the electromagnetic wave wavelength at the resonance frequency between the outer edge of the dielectric plate 2b and the outer case 11. Has been confirmed by simulation.

  In addition, at least the short side edge of the rectangular antenna portion 2 should not be placed more than 2/100 of the electromagnetic wave wavelength inside the larger outer edge of the wiring board 20 or the liquid crystal panel portion 4. And the battery 18 should also be arrange | positioned so that the outer edge of the antenna part 2 may not be hidden. 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, the counter electrode 4f, and the 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, the type of liquid crystal 4h to be used, that is, an operation mode such as a TN (Twisted Nematic) mode, an STN (Super Twisted Nematic) mode, or a display type of a normally white mode or a normally black mode. The retardation plate, the polarizing plate and the like are arranged in a predetermined direction according to the above, but the illustration is omitted 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. 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 by the mixer 52 with the local signal output from the VCO 53, and down-converted to a signal in the intermediate frequency band. The PLL circuit 54 compares the phase of the signal obtained by dividing the local signal output from the VCO 53 with a stable reference clock signal, and synchronizes the local signal output from the VCO 53 with the reference clock signal. Generate and stabilize. The signal mixed by the mixer 52 is amplified by the IF amplifier 55, and unnecessary signals are 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.

  The display unit 80 includes a control unit 40, a 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. The battery 18 supplies energy necessary for circuit operation and display.

  The control unit 40, the CPU 62, and the DSP 61 cooperate to calculate time measurement and positioning information, and calculate information such as time, current position, moving distance, and moving speed based on the information. The control unit 40 controls the display of these pieces of information on the liquid crystal panel unit 4 and controls the setting of the operation mode and display mode of the electronic wristwatch 1 according to the operation of the button 16. It is possible to provide advanced functions such as navigation for displaying the current position on a map.

  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, it is desirable that the antenna unit 2 is an antenna suitable for receiving this circularly polarized wave. A compact form is preferable so that it can be incorporated. 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 close to the liquid crystal panel portion 4. Thus, the antenna unit 2 is provided between the wiring board 20 placed and the arm 8 to which the electronic wristwatch 1 is to be attached (FIG. 2).

  FIG. 5A is a plan view of the antenna unit 2 viewed from the side close to the wiring board 20, FIG. 5B is a cross-sectional view showing a power feeding configuration to the antenna unit, and FIG. It is a top view which shows the excitation mode in the electrode near the arm 8 in an antenna part. The conventional patch antenna includes a wide ground electrode and a radiation electrode that is fed through the dielectric plate 2b from the ground electrode side. In the antenna unit 2 used in the present embodiment, the ground electrode, the radiating electrode, and the dielectric plate 2b of the conventional patch antenna have substantially the same shape and size, and the electrode is connected to the ground electrode / radiating like the conventional patch antenna. It cannot be distinguished like an electrode. However, for the sake of convenience, the surface shown in FIG. 5A, that is, the electrode on the opposite side (the electrode 2a described above) (the electrode 2c described above) is called the ground electrode 2c. The electrode 2a on the opposite surface is called a radiation electrode 2a. The radiation electrode 2a is drawn out to the ground electrode 2c side through the through hole. The antenna unit 2 includes a radiation electrode 2a, a ground electrode 2c positioned opposite to the radiation electrode 2a, and a dielectric plate 2b sandwiched between the radiation electrode 2a and the ground electrode 2c.

  On the side of the ground electrode 2c of the antenna unit 2, a power supply / reception point 4k that is connected to the radiation electrode 2a through the dielectric plate 2b from the radiation electrode 2a is provided. It is a 1 mm circle and is insulated from the ground electrode 2c. Further, the portion where the dielectric plate 2b is inserted through the through hole has a cylindrical shape with a diameter of 0.5 mm. The outer sheath of the coaxial cable 25 is connected to the power supply / reception point 4k. The core electrode of the coaxial cable 25 is connected to the ground electrode 2c in the vicinity of the power supply / reception point 4k. At the other end of the coaxial cable 25, the core wire is connected to the SAW filter 35 through the signal terminal 36, and the outer skin is connected to the ground potential of the wiring board 20, thereby connecting the antenna unit 2 and the receiving module 30. taking it. Therefore, the radiation electrode 2 a is connected to the ground potential of the wiring board 20 through the power supply / reception point 4 k, and the ground electrode 2 c is connected to the SAW filter 35 through the signal terminal 36 in the reception module 30. That is, in this embodiment, the power supply / reception point 4k is a ground point to which the ground potential of the reception module 30 is connected, and the ground electrode 2c near the power supply / reception point 4k is connected to a power supply / reception point (signal point) to which a signal is connected. Become. That is, in this case, it can be said that the ground electrode 2 c is the first conductive layer located on the surface of the antenna unit 2 on the side close to the wiring board 20 and is connected to the signal potential of the wiring board 20. The radiation electrode 2 a is a second conductive layer located on the surface of the antenna unit 2 far from the wiring board 20, and can be said to be connected to the ground potential of the wiring board 20. In addition, the name of this grounding point / signal point is a way of calling as seen from the receiving module 30 and is artificial. In the antenna unit 2, the ground electrode 2c and the radiation electrode 2a have substantially the same shape. From the viewpoint of the antenna operation, it may be considered that the ground electrode 2c is at the ground potential and the signal potential is generated at the radiation electrode 2a.

  The radiation electrode 2a has a rectangular shape (substantially square) having a triangular notch 4p at one corner, and is usually copper, aluminum, iron, gold, silver, palladium, indium tin oxide (ITO). However, in this case, it is formed on the surface of the dielectric plate 2b by copper (Cu) plating having a thickness of 10 μm. At the same time, the portion of the through hole that passes through the dielectric plate 2b is also formed by copper (Cu) plating. In the radiation electrode 2a, the individual frequency adjustment can be easily performed by providing the trimming portion 4t obtained by partially scraping the copper (Cu) plating in the vicinity of the notch 4p. The ground electrode 2c has substantially the same rectangular shape as that of the radiation electrode 2a, and is formed at the same time including the power supply / reception point 4k by copper (Cu) plating having a thickness of 10 μm. Thus, if the power supply / reception point 4k is on the ground electrode 2c side, the length of the coaxial cable 25 can be minimized and connected to the input portion of the received signal on the wiring board 20, that is, the SAW filter 35, It is possible to minimize the influence on the electromagnetic field distribution in the vicinity of the antenna unit 2 due to the loss due to the coaxial cable 25 and the drawing of the wire, and to maintain good antenna performance.

The dielectric plate 2b has a rectangular shape substantially the same size as that of 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 plate 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 plate 2b in the electronic device is desirably 2 cm to 4 cm on a side in the case of a rectangular shape like the electronic wristwatch 1. For reference, when the dielectric plate 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 plate 2 b of the antenna unit 2 uses alumina (Al ₂ O ₃ ) having a rectangular shape with a thickness of 0.8 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 9.6 and the dielectric loss tangent is 0.00014. Further, the cutout 4p is set to have a cutout of 3 mm on the short side and 3.5 mm on the long side. The cutouts 4p can be provided at any number of the four corners of the dielectric plate 2b, that is, at locations 0-4. In particular, in the case of digital display, a rectangular shape with a corner is preferred in terms of design. In this case, an electronic device having an excellent exterior design can be realized by providing the notches 4p at the four corners.

  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.5 (c), the antenna part 2 is a pin electric power feeding system which receives electric power in the part of the power receiving / feeding point 4k. This method can generate an excitation mode without using a special circuit element or the like in the power receiving system, and is simple and can easily receive circularly polarized waves. When the antenna unit 2 having such an arrangement receives radio waves, the excitation mode F1 current flows on the radiation electrode 2a in the long side direction, and the current in the excitation mode F2 is perpendicular to the excitation mode F1, that is, in the short side direction. Flows. Further, a current having the opposite phase flows in the same direction as F1 and F2 on the ground electrode 2c. In other words, the position of the power supply / reception point 4k can be set by the configuration of the antenna unit 2 so that the excitation modes F1 and F2 as described above occur. 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 4t. Control such as setting F2 to a different phase can be easily performed, and circularly polarized wave can be received. The trimming portions 4t can also be provided at any number and location in the four corners of the radiation electrode 2a or the ground electrode 2c. An appropriate position and number may be selected depending on the ease of adjustment during manufacturing.

  In some cases, the outer shape of the antenna unit 2 must be a rectangle with a large aspect ratio because of extreme demands for miniaturization and restrictions on the exterior design of the device. In this case, the difference in resonance frequency between the excitation mode F1 and the excitation mode F2 is greatly different. Even in such a case, linearly polarized light can be received if the resonance frequency of the excitation mode F1 in the major axis direction is matched with the target reception frequency. Of course, the target reception frequency may be matched with the excitation mode F2, but in this case, the size of the antenna unit 2 is increased. The fact that the frequency can be adjusted to F2 is a case where the antenna size has a margin, and at that time, circularly polarized waves can be received.

  When a radio wave arrives at the antenna unit 2, a surface current flowing along the ground electrode 2c and the radiation electrode 2a is induced, and a reception signal is obtained at the power receiving / feeding point 4k by this current. The surface current flowing along the ground electrode 2c and the radiation electrode 2a has a two-dimensional distribution, and the distribution differs depending on the excitation modes F1 and F2. These current distributions can be replaced with a one-dimensional distribution by assuming magnetic currents 2e, 2f, 2g, and 2h flowing in the outer edge of the antenna unit 2, as shown in FIG. Magnetic currents 2e and 2h are induced by the excitation mode F1, and magnetic currents 2f and 2g are induced by the excitation mode F2. In order not to affect the induction of these magnetic currents, it is important for maintaining the antenna performance that the outer edge of the antenna unit 2 has sufficient clearance.

It has been found by simulation and experiment that the amount of this clearance does not have a serious effect on the antenna performance if it takes the following values. The clearance will be described with reference to FIG. Conductive materials such as metal are provided in each range of the distance Δp from the outer edge of the antenna unit 2 to the outside in the plane direction, the distance Δc from the outer edge to the inside in the plane direction, and Δe from the ground electrode 2 c of the antenna unit 2 in the height direction. Do not leave. If there is a conductive material in this range, the antenna performance is significantly deteriorated. In addition, a conductive material such as a metal should not be placed in the range of Δe in the height direction from the radiation electrode 2a of the antenna unit 2. However, since the size of the battery 18 is usually small, this condition can be easily achieved. Not shown. Here, specific values of Δp, Δc, and Δe should be set to 2/100 or less, 0.5 / 100 or more, and 0.00.5 / 100 or more of the wavelength of the received radio wave. That is, the distance Δp between the smaller outer edge of the radiating electrode 2a or the ground electrode 2c of the antenna unit 2 and the larger outer edge of the wiring board 20 or the liquid crystal panel unit 4 placed thereon is determined by the wavelength of the received radio wave Of 2/100 or less. Preferably, arranged so as to be Delta] p <0 as Delta] p ₁ within the ellipse 81 of Delta] p = 0 or 2. In particular, Δp = 0 is most desirable in terms of mounting efficiency. Further, in the range from Δp outside the outer edge of the antenna portion 2 to Δc inside, a clearance of Δe = 0.5 / 100 wavelength or more is required both above the ground electrode 2c and below the radiation electrode 2a. Both Δc and Δe are preferably set to 1/100 wavelength or more. Among these three-direction clearances, the influence of Δp is particularly great, and it is important to set Δp ≦ 2/100 wavelength. In addition, due to the demand for extreme miniaturization and restrictions on the exterior design of equipment, when receiving linearly polarized waves with the rectangular antenna part 2 having a large aspect ratio, the clearance described above should be provided at least on the short side of the rectangle. It is necessary to take.

  In the electronic wristwatch 1, if the outer shape of the antenna unit 2, the liquid crystal panel unit 4, and the wiring substrate 20 can be made substantially the same, the most efficient mounting is achieved. If the antenna unit 2 of the present embodiment is used in the mounting structure of the present embodiment, the above clearance can be easily secured even if the antenna unit 2, the liquid crystal panel unit 4 and the wiring board 20 have the same shape. It is possible to realize the electronic wristwatch 1 having high efficiency and good reception performance. That is, even if the outer shapes of the antenna unit 2, the liquid crystal panel unit 4, and the wiring board 20 are substantially the same, the antenna unit 2 has almost no influence of the liquid crystal panel unit 4 or the wiring board 20 on the outer edge of the antenna unit 2. The magnetic currents 2e, 2h, 2f, and 2g (FIG. 5A) can be formed without being received. Thereby, the antenna part 2 can receive reliably the electromagnetic wave from the GPS satellite 90 as a receiving part. This is almost the same if Δp ≦ 2/100 wavelength even when the antenna portion 2 is larger than the outer shape of the liquid crystal panel portion 4, that is, when Δp <0, and even when the antenna portion 2 is smaller than the liquid crystal panel portion 4. The same can be said.

  As described above, in the electronic wristwatch 1 according to the first embodiment, the wiring board 20 is disposed on the arm 8 side with respect to the liquid crystal panel unit 4, and the antenna is located at a position closer to the arm 8 than the wiring board 20. Part 2 is arranged. In the electronic wristwatch 1 having such a configuration, the liquid crystal panel unit 4 and the wiring board 20 are arranged close to each other, and the flexible substrate 4n that connects the liquid crystal panel unit 4 and the wiring board 20 is separated from the antenna unit 2. There is an advantage that the reception performance can be improved because the antenna unit 2 is hardly affected by the flexible substrate. Thereby, even when the electronic wristwatch 1 is downsized, the reception performance can be maintained. Further, the antenna unit 2 is arranged so that the power supply / reception point 4k 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. is there. Therefore, the antenna unit 2 and the wiring board 20 can be easily connected. Furthermore, a ground potential of the wiring board 20 is connected to the radiation electrode 2a, and a signal terminal 36 for inputting a reception signal in the reception module 30 is connected to the ground electrode 2c. As a result, the ground electrode 2c is sandwiched between the ground potential wiring occupying a large area on the wiring board 20 and the radiation electrode 2a connected to the ground potential, thereby minimizing the influence from the outside. It becomes possible. The electronic wristwatch 1 can particularly suppress the proximity to the arm 8 that is a good conductor, that is, the fluctuation of the reception performance due to a slight shift in the wearing state and the wearing position, and the influence when a finger or the like is brought close to the display surface side. Similarly, it can be minimized as well.

In the electronic wristwatch 1, when the back cover 13 is configured in the form of a conductive conductor such as metal, a wide range including a large conductor of a human body including an arm that is in close contact with the battery and a battery is ground potential of the wiring board 20. It becomes. As a result, the electronic wristwatch 1 can obtain more stable and higher performance antenna characteristics. Further, since the battery 18 is considered to be at the ground potential of the wiring board 20 at the reception frequency, the battery 18 does not approach the radiation electrode 2a connected to the ground potential and affect it. With this configuration, the battery 18 can be placed closest to the back cover 13 to facilitate replacement.
(Embodiment 2)

  Next, another form of the antenna unit will be described. FIG. 6 is a cross-sectional view illustrating an antenna unit configuration in the electronic wristwatch of the second embodiment. The electronic wristwatch 100 according to the second embodiment is different from the first embodiment in the connection between the power supply / reception point 4k of the antenna unit 2 and the coaxial cable 25. In the following description, parts having the same functions in the electronic wristwatch 100 are given the same reference numerals as those in the first embodiment, and the description thereof is omitted. Only parts different from those in the first embodiment will be described.

In the electronic wristwatch 100, when the power supply / reception point 4k of the antenna unit 2 and the coaxial cable 25 are connected, the power supply / reception point 4k is connected to the core wire of the coaxial cable 25, and the vicinity of the power supply / reception point 4k of the ground electrode 2c is the outer sheath of the coaxial cable 25. It is connected to the. In this case, the outer sheath of the coaxial cable 25 may be connected so as to surround the power supply / reception point 4k. At the other end of the coaxial cable 25, that is, the side connected to the wiring board 20, the core wire of the coaxial cable 25 is connected to the ground potential of the wiring board 20 through the connector 26, and the outer skin is the signal terminal 36 of the receiving module 30. It is connected to the. With this connection, the potentials of the radiation electrode 2a and the ground electrode 2c are the same as those in the first embodiment, and the same effect as in the first embodiment can be obtained. Further, since the core wire of the coaxial cable 25 is connected to the ground potential on the side of the wiring board 20 and the outer skin is connected to the SAW filter 35 through the signal terminal 36, leakage current (common mode current) flows and matches on the wiring board. Although the conditions change a little, it is easy to eliminate the effect. The amount of change of the matching condition is very small, and the influence can be eliminated by slightly changing the constant of the matching circuit. Furthermore, according to the present embodiment, since the potential of the outer sheath of the coaxial cable 25 and the ground electrode 2 c are the same, no leakage current flows between the ground electrode 2 c and the outer sheath of the coaxial cable 25. As a result, the electromagnetic field distribution formed in the antenna unit 2 can be brought closer to the original operation state, that is, an ideal operation state in which there is no adverse effect due to the disturbance of the electromagnetic field by the conductive object in the vicinity of the antenna unit 2. it can. Moreover, it can suppress that a characteristic fluctuates with the routing position of the coaxial cable 25. FIG. Further, a general-purpose coaxial connector generally used for connection between the power supply / reception point 4k and the coaxial cable 25 can be used, and the manufacture and maintenance of the electronic wristwatch 100 can be facilitated.
(Embodiment 3)

  Next, another form of the antenna unit will be described. FIG. 7 is a cross-sectional view showing an antenna unit configuration in the electronic wristwatch of the third embodiment. The antenna unit 2 in the electronic wristwatch 200 according to the third embodiment is different from the first and second embodiments in the arrangement direction of the radiation electrode 2a and the ground electrode 2c. Hereinafter, components having the same functions in the electronic wristwatch 200 are denoted by the same reference numerals as those in the first and second embodiments, and the description thereof is omitted. Only parts different from the first embodiment will be described.

  In the electronic wristwatch 1 or the electronic wristwatch 100 according to Embodiments 1 and 2 described above, the ground potential of the wiring board 20 is connected to the radiation electrode 2a. As described above, the radiation electrode 2a and the ground electrode 2c have substantially the same shape, and it is convenient to call the radiation electrode 2a. In the first and second embodiments, the radiation electrode 2a is formed through a through hole. The extracted electrode is called a ground electrode 2c. This is a name depending on the outer shape of the antenna unit 2. If a name based on the operation of the antenna unit 2 is given, it is more appropriate to consider that the ground electrode 2c is operating as a radiation electrode in the first and second embodiments. In the third embodiment, the arrangement of the antenna unit 2 is changed so that the name from the antenna shape matches the name from the operation.

  As shown in FIG. 7, the antenna unit 2 of the electronic wrist watch 200 has a ground electrode 2c, a dielectric plate 2b, and a radiation electrode 2a in order from the battery 18 side, and is provided on the ground electrode 2c side. Power is supplied from the electrical point 4k to the signal terminal 36 (FIG. 4) which is a reception input of the reception module 30. That is, in this case, it can be said that the radiation electrode 2 a is the first conductive layer located on the surface of the antenna unit 2 on the side close to the wiring board 20 and is connected to the signal potential of the wiring board 20. The core wire of the coaxial cable 25 is connected to the power supply / reception point 4k, and the outer sheath of the coaxial cable 25 is connected to the power supply / reception point 4k so as to surround the power supply / reception point 4k. The antenna unit 2 is connected to the wiring board 20 by the coaxial cable 25, and the core wire is connected to the signal terminal 36 of the receiving module 30 on the wiring board 20. According to this configuration, the coaxial cable 25 becomes longer than the configurations in the first and second embodiments, but the influence of leakage current on the wiring board 20 and in the vicinity of the power supply / reception point 4k of the antenna unit 2 can be minimized. .

  According to the antenna unit 2 in the electronic wristwatch 200 of the present embodiment, the wiring board 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. There is an advantage that the reception performance can be improved by making it difficult to receive, and by minimizing the influence of the leakage current on the wiring board 20 and in the vicinity of the power supply / reception point 4k of the antenna unit 2.

  The electronic wristwatch 1, 100, 200, which is the electronic device described above, is not limited to the above-described embodiments, and is similar to any of the embodiments, even in the following modifications. Effects can be obtained.

  (Modification 1) The antenna unit 2 and the liquid crystal panel unit 4 of the electronic wristwatch 1, 100, 200 are in the form of a rectangular shape, but are not limited to this form, and are circular, elliptical, and other rhombuses. Or a parallelogram, a polygon, or the like, and functions in the same manner as the rectangular shape.

  (Modification 2) The notch 4p of the antenna unit 2 is not limited to a triangular shape, and is formed in a concave shape from the outer edge toward the inside of the antenna unit 2, or a shape protruding from the outer edge in a convex shape. It may be. Thereby, the antenna unit 2 can be set flexibly in accordance with the design shape of the electronic wristwatch 1, 100, 200 or the like. Similarly, the shape of the trimming portion 4t is not limited to a triangular shape, and may be a shape formed in a concave shape from the outer edge toward the inside of the antenna portion 2, or a shape scraped in parallel to the outer edge. Further, any number of trimming portions 4t may be provided on either side of the radiation electrode 2a or the ground electrode 2c, and it is not always necessary to place the trimming portion 4t at the same location as the cutout portion 4p.

  (Modification 3) The connection between the antenna unit 2 and the signal terminal 36 of the receiving module 30 is not limited to the coaxial cable 25. Lead wires, coplanar guides, microstrip lines, Rehel lines, and the like can also be used.

  (Modification 4) The electronic device is not limited to the electronic wristwatch 1, 100, 200, but also includes a travel clock, a pocket watch, and a watch attached to a portable electronic device having the antenna unit 2, and further a watch function. It is also possible to apply to a portable terminal or the like that does not have For example, it is attached to the human body to collect biological information, and the collected data is sent to an external computer via wireless communication, or attached to an animal for wildlife ecological observation and collected. The present invention can also be applied to a device that performs such operations.

  (Modification 5) The display body portion is not limited to the liquid crystal panel portion 4, but may be one using a display other than liquid crystal, for example, organic EL (organic electroluminescence) or EPD (Electro Phoretic). Display). Furthermore, it is possible to employ an analog timepiece display composed of hands, a dial, a step motor that drives the hands, and a train wheel.

  DESCRIPTION OF SYMBOLS 1 ... Electronic wristwatch as electronic device, 2 ... Antenna part, 2a ... Radiation electrode as 2nd conductive layer, 2b ... Dielectric plate as dielectric, 2c ... Ground electrode as 1st conductive layer, 4 ... Display body Liquid crystal panel unit as a unit, 4k: Power supply / reception point, 4n: Flexible substrate, 4p ... Notch unit, 4t ... Trimming unit, 8 ... Arm, 11 ... Exterior case, 20 ... Wiring substrate, 25 ... Coaxial cable, 30 ... Reception Module: 40 ... control unit, 90 ... GPS satellite, 100 ... electronic wristwatch as electronic device, 200 ... electronic wristwatch as electronic device.

Claims (7)

An electronic device including an antenna unit for performing at least one of transmission and reception of radio waves, a display body unit for displaying information, and at least one wiring board,
The antenna unit has a plate-like dielectric, a first conductive layer disposed on one surface of the dielectric, and a second conductive layer disposed on the other surface,
The first conductive layer is located on a surface of the antenna unit on the side close to the wiring board and connected to the signal potential of the wiring board, and the second conductive layer is on the side of the antenna part far from the wiring board. Is connected to the ground potential of the wiring board,
The electronic device, wherein the wiring board is disposed between a back surface of the display body portion and the first conductive layer. The electronic device according to claim 1,
The antenna part and the wiring board are connected to each other on the surface of the antenna part on the side close to the wiring board, with the core wire at one end of the coaxial cable connected to the first conductive layer and the outer skin through the through hole. An electron connected to a conductive layer, and at the other end of the coaxial cable, the core wire is connected to the signal potential of the wiring board, and the outer skin is connected to the ground potential of the wiring board. apparatus. The electronic device according to claim 1,
The antenna unit and the wiring board are connected to each other by connecting a core wire at one end of the coaxial cable to the second conductive layer through a through hole on the surface of the antenna unit on the side close to the wiring board. An electron connected to a conductive layer, wherein at the other end of the coaxial cable, the outer skin is connected to the signal potential of the wiring board, and the core wire is connected to the ground potential of the wiring board. apparatus. The electronic device according to claim 1,
The antenna unit and the wiring board are connected to each other by connecting a core wire at one end of the coaxial cable to the first conductive layer through a through hole on the surface of the antenna unit on the side far from the wiring board. An electron connected to a conductive layer, and at the other end of the coaxial cable, the core wire is connected to the signal potential of the wiring board, and the outer skin is connected to the ground potential of the wiring board. apparatus. The electronic device according to any one of claims 1 to 4,
The electronic apparatus according to claim 1, further comprising a battery for supplying power, wherein the battery is disposed on a side of the antenna unit opposite to the side on which the wiring board is disposed. The electronic device according to claim 1,
The shape of the dielectric of the antenna unit and the shape of at least one of the first conductive layer and the second dielectric layer are n corners (n is 0, 1, 2, 3, 4) And at least the short side of the rectangle has a length of two hundredths of the wavelength of the radio wave from the larger outer edge of the conductor portion formed on the display body portion or the wiring board. An electronic device, characterized in that the electronic device is arranged outside the position inside the inside. The electronic device according to any one of claims 1 to 6,
It further has a conductor larger than the maximum outer shape of any of the display body part, the wiring board, and the antenna part, and the conductor is opposite to the side of the battery where the wiring board is disposed. An electronic device characterized in that the electronic device is arranged on a side.

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