JP2007124011A - Antenna system and electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna system or the like for requiring only a small mount area and capable of excellently receiving a circularly polarized wave signal. <P>SOLUTION: In a wrist watch 1 incorporating the GPS, chip-shaped print antennas 31a, 31b singly capable of receiving a linearly polarized wave signal are employed for indexes 23a respectively corresponding to, e.g. 12 and 2 among indexes 23a formed on a dial 23. Then the antenna system receives a GPS radio wave being a circularly polarized wave by shifting at least one of received signals, e.g. the received signal by the antenna 31a so that a phase difference between the respective received signals by the antennas 31a, 31b is equal to a cross angle θ in th length direction of the antennas 31a, 31b, that is, in a reception characteristic direction and composing the resulting received signals. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antenna device or the like provided with a chip-like antenna element.

  As a conventional wristwatch with a built-in GPS (Global Positioning System), which is a kind of electronic equipment, the antenna that receives GPS radio waves can be removed outside the watch case, and can be removed when GPS is not used (For example, see Patent Document 1).

  In recent years, so-called printed antennas, in which an antenna conductor is formed on a printed wiring board provided inside the device body using a photo-etching technique, are not used so as not to hinder downsizing of mounted products. Yes.

In the case of an antenna that receives GPS radio waves, it is necessary to receive a circularly polarized signal. Therefore, as antennas for receiving circularly polarized signals such as GPS radio waves, two chip-shaped printed antennas for receiving linearly polarized signals are arranged on a printed wiring board along axes orthogonal to each other. A configuration in which at least one printed antenna pair is mounted is known (see, for example, Patent Document 2).
JP 2001-102827 A JP 2004-282109 A

  However, in the technique disclosed in Patent Document 2, it is necessary to arrange the printed antennas constituting one antenna pair along axes orthogonal to each other, which is a limitation in mounting the antenna on a product. This hindered the miniaturization of products. In view of the above circumstances, an object of the present invention is to realize an antenna device or the like that has a small mounting area and can receive a circularly polarized signal satisfactorily.

In order to solve the above-mentioned problem, the invention described in claim 1
Two chip-shaped antenna elements (for example, antennas 31a and 31b in FIGS. 1 to 3) arranged so that predetermined reception characteristic directions for linearly polarized wave reception intersect,
Phase change means (for example, FIG. 2) changes the phase of at least one of the received signals of the two antenna elements to make a phase difference according to the crossing angle in the reception characteristic direction of each of the antenna elements. Phase shift circuit section 32) of FIG.
Signal synthesizing means (for example, the phase shift circuit unit 32 in FIGS. 2 and 3) for synthesizing and outputting both received signals given a phase difference by the phase changing means;
Is an antenna device (for example, the antenna device 620 in FIG. 3).

The invention described in claim 2
A plurality of chip-like antenna elements (for example, antennas 31a and 32b in FIGS. 1 to 3) arranged so that predetermined reception characteristic directions for linearly polarized wave reception intersect;
Phase changing means for changing the phase of some or all of the received signals of the plurality of antenna elements to obtain a phase difference according to the crossing angle in the reception characteristic direction of each of the antenna elements (for example, FIG. 2, the phase shift circuit section 32) of FIG.
Signal synthesizing means (for example, the phase shift circuit unit 32 in FIGS. 2 and 3) for synthesizing and outputting the received signals to which the phase difference is given by the phase changing means;
Is an antenna device (for example, the antenna device 620 in FIG. 3).

The invention according to claim 3 is the antenna device according to claim 1 or 2,
The antenna elements are arranged such that reception characteristic directions of adjacent antenna elements are not orthogonal to each other.

The invention according to claim 4
A viewing space that is visible from the outside (for example, the space between the dial 23 and the watch glass 12 in FIG. 2);
A plurality of chip-like antenna elements (for example, the antennas 31a and 31b in FIGS. 1 to 3) disposed in the viewing space so that predetermined reception characteristic directions for linearly polarized wave reception are different directions;
Phase changing means (for example, FIG. 2) changes the phase of some or all of the received signals of the plurality of antenna elements to make a phase difference corresponding to the difference in the receiving direction characteristic of each of the antenna elements. , A phase shift circuit unit 32) of FIG.
Combined output means (for example, the phase shift circuit unit 32 in FIGS. 2 and 3) for combining and outputting the received signals after the phase difference is given by the phase change means;
Position detecting means (for example, the CPU 100 in FIG. 3) for detecting the current position based on the signal output by the combined output means;
Is an electronic device (for example, the wristwatch 1 of FIGS. 1 to 3).

The invention according to claim 5 is the electronic device according to claim 4,
The antenna element is formed by electrically connecting a plurality of antenna element pieces whose reception characteristic directions are parallel.

The invention according to claim 6 is the electronic device according to claim 4,
The antenna element is a predetermined decorative member disposed in the viewing space.

The invention according to claim 7 is the electronic device according to claim 4,
An analog clock mechanism (for example, the analog pointer mechanism 26 in FIG. 2) is provided,
The visual recognition space is a space formed between a dial (for example, the dial 23 of FIG. 2) and a glass surface (for example, the watch glass 12 of FIG. 2),
The antenna element has a time character (for example, a time character 23a corresponding to 12:00 and 2 o'clock in FIGS. 1 and 2).

  According to the first aspect of the present invention, the reception signals of the two antenna elements for linearly polarized wave reception are combined with the phase difference corresponding to the crossing angle in the reception characteristic direction of each antenna element. As a result, an antenna device that can receive circularly polarized waves with a small mounting area can be realized by using two antenna elements for receiving linearly polarized waves. Further, at this time, the receiving characteristic directions of the two antenna elements do not necessarily have to be orthogonal to each other, so that the degree of freedom in layout when mounted on the product is increased, and miniaturization of the product is not hindered.

According to the second aspect of the present invention, the reception signals of the plurality of antenna elements for linearly polarized wave reception are combined with the phase difference corresponding to the crossing state of the reception characteristic directions of the antenna elements.
Thereby, the antenna device which can receive circular polarization favorably with a small mounting area can be realized by using a plurality of antenna elements for linearly polarized wave reception. At this time, the reception characteristic directions of the plurality of antenna elements do not necessarily have to be orthogonal to each other, so that the degree of freedom in layout when mounted on a product is increased, and downsizing of the product is not hindered.

  According to the invention described in claim 3, the antenna elements are arranged so that the reception characteristic directions of the adjacent antenna elements are not orthogonal to each other. That is, since circularly polarized waves can be received without arranging the reception characteristic directions of adjacent antenna elements to be orthogonal to each other, the degree of freedom in layout when mounting this antenna device on a product can be increased.

  According to the fourth aspect of the present invention, the reception signals of the plurality of antenna elements for linearly polarized wave reception, which are arranged in the viewing space so that the reception characteristic directions are different, are at the intersection angles of the reception characteristic directions of the respective antenna elements. The corresponding phase difference is combined and combined, and the current position is detected based on the combined signal. Accordingly, it is possible to realize an electronic device that receives circularly polarized waves satisfactorily using a plurality of antenna elements for linearly polarized wave reception and detects the current position based on the received signal. At this time, since the reception characteristic directions of the plurality of antenna elements do not necessarily have to be orthogonal to each other, the use of this antenna element can avoid restrictions on the mounting method that hinder downsizing of electronic equipment.

  According to the invention described in claim 5, the antenna element is formed by electrically connecting a plurality of antenna element pieces whose reception characteristic directions are parallel. As a result, for example, one antenna element can be configured by connecting a plurality of antenna element pieces arranged separately, so that the degree of freedom in layout when the antenna element is mounted on the electronic device is increased, and the electronic device is downsized. It is possible to avoid restrictions on the mounting method of the antenna element that hinders.

  According to the invention described in claim 6, the decorative member of the decorative object arranged in the viewing space can be used as the antenna element. Thereby, it is not necessary to particularly prepare a space for mounting the antenna element in the viewing space, and it does not hinder downsizing of the electronic device.

  According to the seventh aspect of the present invention, in an analog timepiece that is a kind of electronic equipment, time characters can be used as antenna elements.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. In the following, a case where the present invention is applied to a wristwatch incorporating a GPS will be described. However, it is not limited to this.

[appearance]
FIG. 1 is a plan view of a wristwatch 1 in the present embodiment, and FIG. 2 is a cross-sectional view taken along the line AA ′ of the wristwatch 1 (cross-sectional view at 12 o'clock to 6 o'clock). The wristwatch 1 includes a watch case 10 that houses a watch module, a GPS module, and the like. A watch band 60 for attaching the watch case 10 to the user's wrist is attached to the outer peripheral portion of the watch case 10 at 6 o'clock and 12 o'clock. A switch 11 is provided for instructing execution of the various functions 1.

  The watch case 10 is formed in an annular short column shape from a metal such as stainless steel or titanium. In addition, an extension part for attaching the watch band 60 is formed on the side part of each position of the watch case 10 at 12:00 and 6 o'clock, and a pin for attaching the watch band 60 is formed on this extension part. A hole through which the hole passes is formed.

  A watch glass 12 is fitted on the upper end portion (upper side in FIG. 2) of the watch case 10 via a packing 13 so as to close the upper end portion, and the lower end portion (lower side in FIG. 2). ), A back cover (back) 14 is attached via an O-ring 15 so as to close the lower end portion. The back cover 14 is made of a strong metal such as stainless steel or titanium and has a substantially flat plate shape with a small thickness.

  Inside the watch case 10, an upper housing 21 and a lower housing 22 are arranged with their peripheral portions attached to an inner frame provided on the inner peripheral surface of the watch case 10.

  A printed wiring board 30 formed of a predetermined resin is disposed on the upper surface of the upper housing 21, and a dial plate 23 is disposed on the upper surface of the printed circuit board 30. A ring-shaped parting plate 24 is disposed on the upper surface of the dial 23. Are arranged in contact with the peripheral edge of the watch glass 12. A liquid crystal display panel 25 for displaying time and the like is supported by the upper housing 21 below the opening 23b formed at a position near 6 o'clock on the dial 23. That is, when the wristwatch 1 is viewed from the front, the dial 23 can be seen through the watch glass 12, and the time displayed on the liquid crystal display panel 25 can be seen through the opening 23b of the dial 23. The pointer 26a is moved through the viewing space.

  In addition, on the upper surface of the dial 23, twelve time letters 23a formed in a substantially rectangular shape in plan view are provided at equal intervals in the circumferential direction, and these time letters 23a are arranged from 1 o'clock to 12 o'clock. It corresponds to each time. In the present embodiment, among these time characters 23a, the time characters 23a corresponding to 12:00 and 2 o'clock are antennas 31a and 31b that individually receive linearly polarized signals, and these two antennas 31a, 31a, 31b is configured to be able to receive GPS radio waves that are circularly polarized signals. The antennas 31 a and 31 b are so-called printed antennas in which a predetermined antenna conductor is formed by patterning on the upper surface (front surface) of the printed wiring board 30, so that the antennas 31 a and 31 b are exposed upward from openings formed at corresponding positions on the dial 23. Is formed.

  In addition, a phase shift circuit unit 32 formed by printed wiring is disposed on the lower surface (back surface) of the printed wiring board 30 at a position close to 12:00. The phase shift circuit unit 32 is electrically connected to each of the antennas 31a and 31b, and changes (shifts) the phase of at least one of the received signals so that the phase difference between the received signals by the antennas 31a and 31b becomes a predetermined angle θ. Phase).

  In addition, the upper housing 21 includes an analog pointer mechanism 26 disposed in the vicinity of the center of the inside of the watch case 10. The analog pointer mechanism 26 has a pointer shaft extending upward from a shaft hole formed in the central portion of the dial 23, and a pointer 26a such as an hour hand or a minute hand attached to the pointer shaft. The needle is moved above the board 23.

  A battery 27 is incorporated in the lower housing 22. A circuit board 28 is connected between the upper housing 21 and the lower housing 22 to connect and control an analog pointer mechanism 26, antennas 31a, 31b, and the like.

  The circuit elements included in the circuit board 28 are electrically connected to the antennas 31 a and 31 b via the control IC such as a CPU, a clock circuit that has an oscillation circuit and measures the current time, and the phase shift circuit unit 32. There is a receiving circuit for extracting position data from signals received by the antennas 31a and 31b. The control IC specifies the current position of the wristwatch 1 based on the position data extracted by the receiving circuit, displays the current time measured by the time measuring circuit on the liquid crystal display panel 25, or indicates the current time. In this way, the analog pointer mechanism 26 is controlled to move the pointer 26a.

[Internal configuration]
FIG. 3 is a block diagram showing the internal configuration of the wristwatch 1. According to the figure, the wristwatch 1 includes a CPU 100, an input unit 200, a display unit 300, a ROM 400, a RAM 500, a position detection control circuit unit 600, a phase shift circuit unit 32, a time measuring circuit unit 700, And an oscillation circuit unit 720.

  The CPU 100 reads out a program stored in the ROM 400 in response to a predetermined timing or an operation signal input from the input unit 200 and develops it in the RAM 500. Based on the program, instructions and data to each unit constituting the wristwatch 1 are read. Perform forwarding, etc. Specifically, for example, a timing process for displaying the current time by the timing circuit unit 700 on the display unit 300, or a position detection process for detecting the current position based on a position information signal input from the position detection control circuit unit 600. Etc.

  The input unit 200 includes a switch 11 for instructing execution of various functions of the wristwatch 1, and outputs a corresponding operation signal to the CPU 100 when the switch 11 is operated. The display unit 300 includes the dial 23 and the analog pointer mechanism 26 controlled by the CPU 100 and the liquid crystal display panel 25, and displays the current time measured by the time measuring circuit unit 700.

  The ROM 400 stores system programs and application programs for the wristwatch 1, programs and data for realizing the present embodiment, and the like. The RAM 500 is used as a work area of the CPU 100, and temporarily stores programs read from the ROM 400, data processed by the CPU 100, and the like.

  The phase-shift circuit unit 32 includes at least one of the reception signals from the antennas 31a and 31b so that the phase difference between the reception signals of the antennas 31a and 31b becomes the crossing angle θ in the longitudinal direction of the antennas 31a and 31b, that is, the reception characteristic direction. The phase of one received signal is changed (shifted). Specifically, for example, the phase difference between both received signals is set to “θ” by shifting the phase of one received signal by “θ”. Then, two received signals having this phase difference as “θ” are synthesized and output. The phase shift circuit unit 32 constitutes an antenna device 620 together with the antennas 31a and 31b.

  FIG. 4 shows an example of the circuit configuration of the phase shift circuit unit 32 and the antennas 31a and 31b. According to the figure, the phase shift circuit unit 32 is an offset power feeding type phase shift circuit and includes a phase shifter 33. The phase shifter 33 shifts the phase of the signal received by the antenna 31b by “θ” and outputs it. Here, “θ” is the crossing angle in the longitudinal direction of the antennas 31a and 31b. Then, from the phase shift circuit unit 32, the reception signal of the antenna 31a and the output signal from the phase shifter 33 are combined and output. That is, the reception signals of the antennas 31a and 31b having a mutual phase difference of “θ” are combined and output.

  FIG. 5 shows an example of the circuit configuration of the phase shifter 33. According to the figure, the phase shifter 33 has a known configuration including inductors L1 and L2 and a capacitor C, and the phase shift angle of the input signal is determined by the set values of the inductors L1 and L2 and the capacitor C. . The phase shifter 33 is formed by patterning a predetermined conductor on the printed wiring board 30.

  In FIG. 3, the position detection control circuit unit 600 calculates position information (for example, latitude, longitude, altitude, etc.) based on the signal input from the phase shift circuit unit 32. The CPU 100 calculates the current position of the wristwatch 1 based on this position information.

  The clock circuit unit 700 counts the signal input from the oscillation circuit unit 720 to clock the current time, and outputs the clocked current time data to the CPU 100. The oscillation circuit unit 720 is a circuit that always outputs a clock signal having a constant frequency.

[Action / Effect]
As described above, according to the present embodiment, the wristwatch 1 has the antennas 31a and 31b which are chip-shaped printed antennas whose time letters 23a corresponding to 12:00 and 2 o'clock can individually receive linearly polarized signals. Composed. Then, the phase shift circuit 32 shifts at least one of the received signals so that the phase difference of the received signals from the antennas 31a and 31b becomes the crossing angle θ in the longitudinal direction of the antennas 31a and 31b, that is, the receiving characteristic direction. And synthesized. As a result, GPS radio waves that are circularly polarized waves can be received well. Further, since the antennas 31a and 31b are also used as the time letters 23a and the longitudinal directions thereof do not have to be orthogonal, the degree of freedom in layout is increased, and miniaturization of the wristwatch 1 by mounting the antenna is not hindered.

[Modification]
It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can of course be changed as appropriate without departing from the spirit of the present invention.

(A) Phase shift circuit section 32
For example, in the above-described embodiment, the phase shift circuit unit 32 has the circuit configuration illustrated in FIG. 4, but may have other configurations.

  FIG. 6 shows a circuit configuration of a phase shift circuit unit 32A, which is a distributed constant type phase shift circuit, as another circuit configuration example of the phase shift circuit unit 32. According to the figure, the phase shift circuit section 32A is a distributed constant circuit composed of an offset feeding type microstrip line, one end of which is connected to the antenna 31a, and one end of which is connected to the antenna 31b. The other end of the microstrip line 34b whose line length is longer than the line 34a by “λ · θ / (2π)” is connected.

  Here, “λ” is a wavelength obtained by shortening the wavelength of the GPS radio wave received by the antennas 31a and 31b due to the wavelength shortening effect of the dielectric, and is shorter than the wavelength of the GPS radio wave itself. The shortening rate of this wavelength is mainly determined by the relative permittivity and thickness of the dielectric material that is the material of the printed wiring board 30, the line widths of the lines 34a and 34b, and the like.

  Thus, since the difference in line length between the lines 34a and 34b is “λ · θ / (2π)”, the phase difference between the received signals of the antennas 31a and 31b at the connection point between the lines 34a and 34b is “θ The phase is shifted according to the crossing angle θ in the longitudinal direction of the antennas 31a and 31b.

  In particular, when the longitudinal directions of the antennas 31a and 31b are orthogonal to each other, for example, when the time letters 23a corresponding to 12:00 and 3 o'clock are the antennas 31a and 31b, the branch line type transition shown in FIG. A phase shift circuit unit 32B that is a phase circuit may be used. In the drawing, “λ” is a wavelength obtained by shortening the wavelength of the GPS radio wave due to the wavelength shortening effect of the dielectric that is the material of the printed wiring board 30 as described above. The phase shift circuit 32B synthesizes and outputs reception signals from the antennas 31a and 31b whose phase difference is “θ = 90 °”.

  In the above-described embodiment, the phase shift circuit 32 shifts one of the received signals of the antennas 31a and 31b, but appropriately shifts the phase of both received signals. The phase difference may be “θ”.

(B) Number of Antennas In the above-described embodiment, the two antennas 31a and 31b are provided. However, three or more antennas may be provided. In this case, for each antenna, the received signal may be phase-shifted so that the phase difference between the received signals of the antenna and the other antennas is equal to the crossing angle in the longitudinal direction of the two antennas.

  Specifically, for example, in addition to the antennas 31a and 31b, a time character 23a corresponding to 4 o'clock is defined as an antenna 31c. Here, similarly to the antennas 31a and 31b, the antenna 31c is a printed antenna that can receive a linearly polarized signal alone and is formed by patterning a predetermined antenna conductor on the upper surface of the printed wiring board 30. . In this case, the crossing angle in the longitudinal direction of the antennas 31a and 31b and the crossing angle in the longitudinal direction of the antennas 31b and 31c are both equal to “θ”.

  FIG. 8 shows an example of a circuit configuration of the phase shift circuit unit 32C when the three antennas 31a, 31b, and 31c are provided. According to the figure, the phase shift circuit section 32C has two phase shifters 33a and 33b. The phase shifter 33a changes (phase shifts) the phase of the signal received by the antenna 31b by “θ” and outputs it. The phase shifter 33b changes (phase shifts) the phase of the signal received by the antenna 31c by “2θ” and outputs it.

  Then, from the phase shift circuit unit 32C, the reception signal from the antenna 31a and the output signals of the phase shifters 33a and 33b are combined and output. That is, the antenna 31c in which the phase difference between the reception signal of the antenna 31b and the reception signal of the antenna 31a is "2θ" between the reception signal of the antenna 31a and the reception signal of the antenna 31a is "θ". The received signal is synthesized and output.

  As described above, when three or more antennas are provided, the phase shift circuit unit 32 uses any one of these antennas as a reference, and the received signal of each of the other antennas as an antenna. The phase is shifted by the crossing angle in the longitudinal direction. This makes it possible to receive circularly polarized waves with an antenna that receives signals of three or more linearly polarized waves. The crossing angle in the longitudinal direction of the antennas 31a and 31b and the crossing angle in the longitudinal direction of the antennas 31b and 31c are both equal to “θ”, but may be different.

(C) Forming one antenna with a plurality of antennas In the above-described embodiment, one time character 23a is one antenna. However, two or more antennas whose longitudinal directions are parallel are electrically connected. One antenna may be used.

  Specifically, for example, as shown in FIG. 9, in addition to the antennas 31a and 31b, time letters 23a corresponding to 6 o'clock and 8 o'clock are antennas 31d and 31e, respectively. The figure is a plan view of the dial 23. Here, similarly to the antennas 31a and 31b, the antennas 31d and 31e can receive linearly polarized waves independently, and are printed antennas formed by patterning a predetermined antenna conductor on the upper surface of the printed wiring board 30. . Then, the antenna 31a and the antenna 31d, which are parallel in the longitudinal direction, and the antenna 31b and the antenna 31e are connected by wiring on the printed wiring board 30, for example. As described above, by connecting two antennas having the same longitudinal direction, that is, the reception characteristic direction to form one antenna, it is possible to further improve the reception sensitivity of GPS radio waves.

(D) Decorative member used as antenna In the above-described embodiment, the time character 23a is used as an antenna. However, a decorative member on the dial 23, for example, a decorative character such as a manufacturer name on the dial 23 is used as an antenna. It is also good.

(E) Electronic Device In the above-described embodiment, the case where the present invention is applied to a wristwatch with a built-in GPS has been described. However, the present invention can be similarly applied to any electronic device including an antenna that receives circularly polarized waves. Of course.

The front view of a wristwatch. FIG. The internal block diagram of a wristwatch. The circuit structural example of a phase-shift circuit part. The circuit structural example of a phase shifter. The other circuit structural example of a phase shift circuit part. The other circuit structural example of a phase shift circuit part. The other circuit structural example of a phase shift circuit part. Other arrangement examples of antennas.

Explanation of symbols

1 Watch 100 CPU
200 Input unit 300 Display unit 400 ROM
500 RAM
600 Antenna device 31a, 31b Antenna 32 Phase shift circuit unit 33 Phase shifter 700 Position detection control circuit unit 800 Timing circuit unit 820 Oscillation circuit unit

Claims (7)

Two chip-shaped antenna elements arranged so that predetermined reception characteristics directions for linearly polarized wave reception intersect;
Phase changing means for changing the phase of at least one of the received signals of the two antenna elements to make a phase difference corresponding to the crossing angle of the reception characteristic direction of each of the antenna elements;
Signal synthesis means for synthesizing and outputting both received signals given a phase difference by the phase change means;
An antenna device comprising: A plurality of chip-like antenna elements arranged so that predetermined reception characteristic directions for linearly polarized wave reception intersect;
Phase changing means for changing the phase of some or all of the received signals of the plurality of antenna elements to make a phase difference according to the crossing angle of the reception characteristic directions of each of the antenna elements;
Signal synthesis means for synthesizing and outputting each received signal given a phase difference by the phase change means;
An antenna device comprising:   The antenna device according to claim 1, wherein the antenna elements are arranged so that reception characteristic directions of adjacent antenna elements are not orthogonal to each other. A viewing space visible from the outside,
A plurality of chip-like antenna elements arranged in this viewing space so that the predetermined reception characteristic directions for linearly polarized wave reception are different directions;
Phase changing means for changing a phase of a part or all of the received signals of the plurality of antenna elements to make a phase difference according to a difference in reception direction characteristics of each of the antenna elements;
Combined output means for combining and outputting the received signals after the phase difference is given by the phase changing means;
Position detecting means for detecting the current position based on the signal output by the combined output means;
Electronic equipment comprising.   The electronic device according to claim 4, wherein the antenna element is formed by electrically connecting a plurality of antenna element pieces whose reception characteristic directions are parallel.   The electronic device according to claim 4, wherein the antenna element is a predetermined decorative member disposed in the viewing space. It has an analog clock mechanism,
The viewing space is a space formed between the dial and the glass surface,
The electronic apparatus according to claim 4, wherein the antenna element is a time character.

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