JP2013044704A - Portable electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable electronic apparatus in which degrading of reception sensitivity of an antenna is prevented.SOLUTION: A wrist watch 1 includes a GPS antenna 16 for receiving a satellite signal transmitted from a GPS satellite, a GPS module 21 for processing the received satellite signal, and a number plate 11. The GPS antenna 16 and the GPS module 21 are arranged at a rear surface side opposite to a display surface of the number plate 11, and in addition arranged spaced from each other when viewing the watch 1 from an observation direction for observing the number plate 11.

Description

  The present invention relates to a portable electronic device that receives a satellite signal transmitted from a position information satellite such as a GPS satellite.

2. Description of the Related Art Conventionally, portable electronic devices that receive satellite signals transmitted from GPS (Global Position System) satellites are known (see, for example, Patent Document 1).
The portable electronic device (watch) described in Patent Document 1 includes an antenna that receives a satellite signal transmitted from a GPS satellite, and an electronic device that is electrically connected to the antenna and processes the satellite signal received by the antenna. And a module.

JP 2007-526985 A

  By the way, in the portable electronic device described in Patent Document 1, an antenna is disposed on the electronic module. As described above, when the antenna and the electronic module are arranged close to each other, there is a problem that in-band noise transmitted from the electronic module directly enters the antenna, and the reception sensitivity of the satellite signal is lowered.

  An object of the present invention is to provide a portable electronic device that suppresses a decrease in reception sensitivity of an antenna.

A portable electronic device according to the present invention includes a portable antenna including an antenna that receives a satellite signal transmitted from a position information satellite, a receiving circuit that processes the received satellite signal, and a display unit that displays predetermined information. The antenna and the receiving circuit are arranged on the back side opposite to the display surface of the display unit, and from the observation direction in which the information displayed by the display unit is observed The portable electronic device is arranged so as to be spaced apart from each other.
Here, the antenna and the receiving circuit are arranged on the back side of the display unit means that the antenna and the receiving circuit are arranged in contact with the display unit, and arranged at a position separated from the back side of the display unit. The configuration is also included.

According to the present invention, when the portable electronic device is viewed from the observation direction for observing information displayed on the display unit, that is, from the direction orthogonal to the display surface of the display unit on which information is displayed. The antenna and the receiving circuit are arranged apart from each other in a plan view of the type electronic device. For this reason, in-band noise transmitted from the receiving circuit is difficult to enter the antenna, and a decrease in receiving sensitivity of the antenna can be suppressed.
In addition, in the portable electronic device of the present invention, an antenna and a receiving circuit are arranged on the back side of the display unit. For this reason, when the portable electronic device is viewed from the observation direction for observing the information displayed on the display unit, the antenna and the receiving circuit are not exposed from the display surface for displaying the information on the display unit, and the appearance is improved. it can. In addition, compared with a configuration in which one of the antenna and the receiving circuit is provided on the display surface side and the other is provided on the back surface side, an increase in thickness dimension can be suppressed, and the portable electronic device can be reduced in size and portability. Can be improved.

The portable electronic device of the present invention preferably has a substrate on which the antenna and the receiving circuit are provided.
According to the present invention, the antenna and the receiving circuit are arranged on the same substrate. According to this, for example, the number of substrates can be reduced and wiring between the substrates can be made unnecessary as compared with a configuration in which the substrate on which the antenna is disposed and the substrate on which the reception circuit is disposed are provided as separate substrates. Therefore, the configuration of the portable electronic device can be simplified, and the portable electronic device can be further downsized and the manufacturing cost can be reduced. Further, since the number of unnecessary wirings is reduced, it is possible to ensure the stability of signal processing in the receiving circuit.

In the portable electronic device of the present invention, it is preferable that the antenna and the receiving circuit are arranged on the same surface of the substrate.
According to the present invention, since the antenna and the receiving circuit are disposed on the same surface (same mounting surface) of the substrate, for example, the antenna is disposed on one surface side of the substrate and the receiving circuit is disposed on the other surface side. A thickness dimension can be made small compared with a structure etc. Therefore, the portable electronic device can be further reduced in size.

In the portable electronic device of the present invention, the display unit includes a pointer that displays the information, and a pointer shaft that is positioned at the center of the display unit when viewed from the observation direction and holds the pointer. It is preferable that the antenna and the receiving circuit are arranged at positions that are point-symmetric with respect to the pointer axis when viewed from the observation direction.
According to the present invention, the antenna and the receiving circuit are arranged point-symmetrically with respect to the pointer shaft at the center position of the display unit, so that the antenna and the receiving circuit can be reliably spaced apart. Therefore, the influence of in-band noise transmitted from the receiving circuit can be reduced more reliably, and the receiving sensitivity of the antenna can be improved.

In the portable electronic device according to the aspect of the invention, when the display unit observes the display unit from the observation direction, the upper direction is 0 o'clock direction, the right direction is 3 o'clock direction, the lower direction is 6 o'clock direction, and the left direction is Preferably, the dial has a 9 o'clock direction, and the antenna is disposed at a position corresponding to the 9 o'clock direction of the dial.
According to the present invention, satellite signals can be easily received when a portable electronic device is used as a wristwatch. In other words, when wearing a wristwatch, in general, it is often worn on the left arm (especially the wrist). In this case, the 9 o'clock direction is vertically upward with the arm hung down. Therefore, by disposing the antenna in the 9 o'clock direction, for example, when the arm is hung vertically downward during walking, the antenna is positioned vertically upward in the portable electronic device. This facilitates reception of satellite signals transmitted from the position information satellite.

In the portable electronic device of the present invention, the portable electronic device includes a housing that houses the antenna and the receiving circuit. The antenna includes an upper surface that faces the display unit, and a side surface that is adjacent to the upper surface. Preferably, the antenna has a side surface facing the side surface, and the side surface portion is made of a non-conductive material.
According to the present invention, the side surface portion of the housing that faces the side surface of the antenna is made of a non-conductive material. For this reason, it can suppress that the satellite signal from the side in a portable electronic device is interrupted | blocked by a housing | casing. Therefore, the antenna can satisfactorily receive the satellite signal from the position information satellite.

In the portable electronic device of the present invention, it is preferable that a region overlapping with the antenna when viewed from the observation direction is made of a non-conductive material.
According to the present invention, the region overlapping the antenna is configured of the nonconductive material in a plan view as viewed from the observation direction in which the display unit is observed. For this reason, the satellite signal input from the observation direction in the portable electronic device is not blocked by the conductive member, and the satellite signal can be satisfactorily received by the antenna.

In the portable electronic device of the present invention, it is preferable that the antenna is a patch antenna.
According to the present invention, for example, a patch antenna having a smaller GND substrate than a chip antenna is used as the antenna. As a result, the antenna can be miniaturized and the portable electronic device can be further miniaturized. In addition, in the patch antenna, it is possible to increase the reception sensitivity of satellite signals on the upper surface (portion facing the display unit) and the side surface (surface adjacent to the upper part) of the antenna.

Schematic which shows the wristwatch which concerns on one Embodiment of this invention. The front view of the wristwatch of this embodiment. 1 is a schematic cross-sectional view of a wristwatch according to an embodiment.

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
The embodiments described below are preferred specific examples of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

FIG. 1 is a schematic view showing a wristwatch 1 with a GPS time adjustment device (hereinafter referred to as “watch 1”) as a portable electronic device according to the present invention, and FIG. FIG. 3 is a schematic sectional view of the wristwatch 1.
The wristwatch 1 receives a satellite signal from at least one GPS satellite 2 among a plurality of GPS satellites 2 orbiting the earth in a predetermined orbit, acquires satellite time information, and holds the time internally. The information (internal time information) can be corrected. The GPS satellite 2 is an example of the position information satellite in the present invention, and a plurality of GPS satellites 2 exist above the earth. Currently, about 30 GPS satellites 2 orbit.

As shown in FIG. 2, the wristwatch 1 includes a dial 11 and a pointer 12 that constitute a display unit of the present invention.
The dial 11 is formed with a scale for indicating the time by the hands 12 as in the case of a general clock. Here, although detailed illustration is omitted, the wristwatch 1 has a normal timepiece function that causes the hour hand 121 to make one turn in the clockwise direction in 12 hours, and the dial 11 has a scale that can display the time by the hour hand 121. Prepare. Therefore, when the wristwatch 1 is worn on the wrist and viewed from the observation direction for observing the scale of the dial 11 (plan view when the dial 11 is viewed from the thickness direction), the upward direction is the 0:00 direction and the right direction is The 3 o'clock direction, the downward direction is the 6 o'clock direction, and the left direction is the 9 o'clock direction.
The dial 11 is made of a non-conductive material (for example, plastic, glass, etc.), and has a configuration that allows satellite signals transmitted from the GPS satellite 2 to pass therethrough.
The pointer 12 includes an hour hand 121, a minute hand 122, and a second hand 123, which are rotatably held by a pointer shaft 124 provided at the center position of the dial 11. These pointers 12 are driven via gears by a step motor (mechanical drive means) described later.

Next, a detailed configuration of the wristwatch 1 will be described.
As shown in FIGS. 2 and 3, the wristwatch 1 includes a housing 10. The housing 10 includes an exterior case 13 (which constitutes a side surface portion of the housing), a bezel 14 that holds a surface glass 140, and a back cover 15.
The outer case 13 constitutes a side surface portion of the housing in the present invention, and is made of a nonconductive material such as plastic, ceramic, glass, or the like. The exterior case 13 is formed in a substantially cylindrical shape, and a surface glass 140 is attached to an opening on the surface side of the exterior case 13 via a bezel 14. A back cover 15 is attached to the opening on the back side of the outer case 13. The back cover 15 is made of metal and formed in a ring shape, and a back glass 150 is attached to an opening at the center thereof. In addition, although the example in which the back surface glass 150 is attached is shown here, for example, a configuration in which a metal lid member is attached may be employed.
Further, as shown in FIG. 2, external operation members such as buttons 131 and 132 and a crown 133 are provided on the exterior case 13.

A step motor for driving the pointer 12, a GPS antenna 16, a solar panel 17, a battery 18, and the like are disposed inside the outer case 13.
The step motor is a general one used for a timepiece including a motor coil 19, a stator (not shown), a rotor, and the like. This step motor drives the pointer 12 via a gear.

The GPS antenna 16 is an antenna that receives satellite signals from a plurality of GPS satellites 2 that orbit the earth over a predetermined orbit. In this embodiment, the GPS antenna 16 is configured by a patch antenna, and receives a satellite signal from the upper surface 16A that mainly receives satellite signals from the dial plate 11 side and the exterior case 13 side (side of the wristwatch 1). And a side surface 16B for receiving mainly. In such a patch antenna, for example, the GND substrate 161 can be made smaller than other antennas such as a chip antenna, and high reception sensitivity can be secured on the upper surface 16A and the side surface 16B. Note that the GPS antenna 16 is not limited to a patch antenna, and for example, a helical antenna, a chip antenna, an inverted F antenna, or the like may be employed.
The GPS antenna 16 is disposed on the opposite side of the display surface 11A (see FIG. 3) of the dial plate 11. Here, as described above, since the dial 11 is made of a non-conductive material, a satellite signal transmitted from a GPS satellite passes through the surface glass 140 and the dial 11 and is input to the GPS antenna 16. Is done. The bezel 14 is made of ceramics in order to improve the reception performance of the satellite signal.

Further, as shown in FIG. 2, the GPS antenna 16 is located on the pointer shaft 124 that holds the pointer 12 when the dial 11 is viewed from the observation direction, that is, in plan view when the dial 11 is viewed from the thickness direction. The dial 11 is arranged in the 9 o'clock direction. In such a configuration, the GPS antenna 16 is arranged vertically above the wristwatch 1 in a state where the user wearing the wristwatch 1 hangs his arm vertically downward, and is transmitted from the GPS satellite. The structure facilitates receiving satellite signals.
Here, as described above, since the exterior case 13 facing the side surface 16B of the GPS antenna 16 is made of a non-conductive material, satellite signals input from the side of the wristwatch 1 are transmitted by the exterior case 13. Passes without being blocked. Therefore, even when the wristwatch 1 is worn on the wrist, the satellite signal from the side of the wristwatch 1 can be satisfactorily received by the GPS antenna 16.

A circuit board 20 is disposed on the back cover side of the GPS antenna 16, and a battery 18 is disposed on the back cover side of the circuit board 20.
The circuit board 20 is based on the control of the GPS module 21 (the receiving circuit of the present invention) for processing the signal received by the GPS antenna 16 and the stepping motor for driving the pointer 12 and the received satellite signal, as will be described later. A clock circuit 22 for correcting the internal time information is attached. The GPS module 21 and the clock circuit 22 are driven by electric power supplied from the battery 18.

Here, the GPS module 21 and the clock circuit 22 are arranged on the surface of the circuit board 20 that faces the dial plate 11. That is, the GPS antenna 16, the GPS module 21, and the clock circuit 22 are provided on the same mounting surface of the circuit board 20, in other words, on the same surface of the circuit board 20.
As shown in FIG. 2, the GPS module 21 is arranged in the 3 o'clock direction with respect to the pointer shaft 124 in a plan view as viewed from the thickness direction of the dial 11. That is, when the wristwatch 1 is viewed from the observation direction for observing the dial plate 11, the GPS antenna 16 and the GPS module 21 are disposed at positions that are point-symmetric with respect to the pointer shaft 124.
In such a configuration, the GPS antenna 16 and the GPS module 21 are arranged apart from each other, and in-band noise transmitted from the GPS module 21 becomes difficult to enter the GPS antenna 16. Thereby, the reception sensitivity of the GPS antenna 16 can be improved.

  Although the GPS module 21 does not show a specific configuration, an RF (Radio Frequency) unit that receives a satellite signal transmitted from a GPS satellite and converts it into a digital signal, and performs correlation determination of the received signal to synchronize. A BB unit (baseband unit) to perform, and an information acquisition unit that acquires time information and positioning information from a navigation message (satellite signal) demodulated by the BB unit.

The RF section consists of a bandpass filter, PLL circuit, IF filter, VCO (Voltage Co
ntrolled oscillator), ADC (A / D converter), mixer, LNA (Low Noise Amplifier), IF amplifier, and the like.
The satellite signal extracted by the band pass filter is amplified by the LNA, mixed with the VCO signal by the mixer, and down-converted to IF (Intermediate Frequency). The IF mixed by the mixer passes through an IF amplifier and IF filter, and is converted into a digital signal by an ADC (A / D converter).

The BB unit generates a local code generation unit that generates a local code composed of the same C / A code as that used at the time of transmission by a GPS satellite, and a correlation value between the local code and a reception signal output from the RF unit. And a correlation unit to calculate.
If the correlation value calculated by the correlator is equal to or greater than a predetermined threshold, the C / A code used for the received satellite signal matches the generated local code, and the satellite signal is captured. (Synchronized). Therefore, the navigation message can be demodulated by correlating the received satellite signal with the local code.

The information acquisition unit acquires time information and position information from the navigation message demodulated by the BB unit. That is, the navigation message transmitted from the GPS satellite includes preamble data, HOW (Handover Word) TOW (Time of Week, also referred to as “Z count”), and subframe data. There are subframe data from subframe 1 to subframe 5. Each subframe includes, for example, satellite correction data including week number data and satellite health data, and ephemeris (detailed orbit information for each GPS satellite). And data such as almanac (general orbit information of all GPS satellites).
Therefore, the information acquisition unit extracts a predetermined data portion from the received navigation message, and acquires time information and position information.

  The clock circuit 22 controls the GPS module 21 and corrects the internal time information based on the acquired time information. Then, the clock circuit 22 drives the hands 12 based on the internal time information to display the time.

The solar panel 17 includes a photovoltaic element that performs photovoltaic generation that converts light energy into electrical energy, and can receive light transmitted through the surface glass 140 to perform photovoltaic generation.
The solar panel 17 is disposed on the surface side of the dial plate 11 and has a diameter smaller than that of the dial plate 11 as shown in FIG. Thereby, when the wristwatch 1 is observed from the observation direction, the scale provided along the outer peripheral edge of the dial 11 can be visually recognized.
As shown in FIG. 2, the solar panel 17 includes a window portion 171 that opens at least in a region overlapping with the GPS antenna 16 in plan view. For this reason, even when the solar panel 17 is arranged, the satellite signal transmitted from the GPS satellite 2 is not obstructed by the solar panel 17, and the GPS antenna 16 receives the satellite signal that has passed through the window portion 171. Is possible.
The battery 18 is a secondary battery such as a lithium ion battery. The battery 18 is a power source for the wristwatch 1 and stores power generated by the solar panel 17.

[Effects of Embodiment]
In the wristwatch 1 of the present embodiment, when the wristwatch 1 is viewed from the observation direction in which the dial 11 is observed (in plan view as shown in FIG. 2), the GPS antenna 16 and the GPS module 21 are arranged apart from each other. ing. For this reason, in-band noise transmitted from the GPS module 21 can be prevented from entering the GPS antenna 16 directly, and reception sensitivity in the GPS module 21 can be improved.
In addition, the GPS antenna 16 and the GPS module 21 are arranged on the back side (back cover 15 side) of the dial plate 11 constituting the display unit. For this reason, the GPS antenna 16 and the GPS module 21 are not exposed to the dial 11 side when viewed from the observation direction, and the appearance is improved. Further, in the present embodiment, for example, one of the GPS antenna 16 and the GPS module 21 is disposed on the front surface side of the dial 11 and the other is disposed on the back surface side. Therefore, the size can be reduced.

  In the present embodiment, the GPS antenna 16 and the GPS module 21 are disposed on the same circuit board 20. For this reason, for example, the configuration of the wristwatch 1 can be simplified as compared with the configuration in which a substrate for disposing the GPS antenna 16 and a substrate for disposing the GPS module 21 are provided, and wiring between these substrates is provided. Miniaturization can be promoted. In addition, since a circuit for connecting the GPS antenna 16 and the GPS module 21 to the circuit board 20 can be formed, unnecessary wiring can be reduced, device reliability can be improved, and signal stability can be improved. Can be improved.

  In the present embodiment, the GPS antenna 16 and the GPS module 21 are disposed on the surface of the circuit board 20 that faces the dial plate 11. Thus, by providing the GPS antenna 16 and the GPS module 21 on one surface side of the circuit board 20, for example, one of the GPS antenna 16 and the GPS module 21 is disposed on the back surface of the circuit board 20, and the other is disposed on the front surface. Compared with the structure to perform, the increase in a thickness dimension can be suppressed and the wristwatch 1 can be further reduced in size (thinner).

  In the present embodiment, the GPS antenna 16 and the GPS module 21 are point-symmetric with respect to the pointer shaft 124 when the wristwatch 1 is viewed from the observation direction, that is, in plan view when viewed from the thickness direction of the dial 11. It is arranged at the position. By setting it as such a structure, the GPS antenna 16 and the GPS module 21 will be arrange | positioned reliably apart, and the influence with respect to the GPS antenna 16 of the in-band noise transmitted from the GPS module 21 can be reduced more reliably. . In addition, since the GPS antenna 16 and the GPS module 21 which are relatively large members are arranged point-symmetrically, the arrangement position balance is improved, and the arrangement structure of each member constituting the wristwatch 1 can be optimized. .

In the present embodiment, the GPS antenna 16 is disposed at the 9 o'clock position of the dial 11 in a plan view as shown in FIG. 2 when the wristwatch 1 is viewed from the thickness direction of the dial 11.
In such a configuration, the wristwatch 1 is attached to the left arm of the user, and the GPS antenna 16 is positioned vertically upward in the wristwatch 1 with the user lowering the arm vertically downward. For this reason, the satellite signal transmitted from the GPS satellite 2 in the sky can be more suitably received by the GPS antenna 16, and the reception sensitivity of the GPS antenna 16 can be improved.

In the present embodiment, the outer case 13 that faces the side surface 16B of the GPS antenna 16 is made of a nonconductive material.
For this reason, a satellite signal is input from the side of the wristwatch 1 such as when the user wears the wristwatch 1 on the left arm and performs reception processing with the GPS antenna 16 with the arm down vertically. In some cases, the sanitary signal can be prevented from being blocked by the outer case 13. Therefore, in the present embodiment, it is possible to suppress a decrease in the reception sensitivity of the GPS antenna 16 even when the user's arm is lowered vertically.

In the present embodiment, the dial plate 11 is made of a nonconductive material. The solar panel 17 includes a window portion 171 that opens at a position overlapping the GPS antenna 16 in plan view. That is, in the present embodiment, at least a member in a region overlapping with the GPS antenna 16 in a plan view is formed of a nonconductive material.
In such a configuration, the satellite signal from the surface glass 140 side is not obstructed by the dial 11 or the solar panel 17. Therefore, the GPS antenna 16 can receive satellite signals with good reception sensitivity.

  In this embodiment, a patch antenna is employed as the GPS antenna 16. In such a patch antenna, the GND substrate 161 can be downsized compared to other antennas. For this reason, it can also contribute to size reduction of the wristwatch 1. In addition, since the patch antenna can ensure high reception sensitivity at the upper surface 16A facing the dial plate and the side surface 16B adjacent to the upper portion, the reception sensitivity is higher than when other types of antennas are arranged. Improvements can be made.

[Modification]
In addition, this invention is not limited to the said embodiment.
For example, in the above-described embodiment, the solar panel 17 is arranged on the surface side of the dial plate 11. However, for example, by arranging a scale on the solar panel 17, the solar panel 17 can function as the display unit of the present invention. Also good. In this case, by attaching a non-conductive material to the window portion 171, it is possible to prevent the GPS antenna 16 from being exposed and maintain the appearance with a high quality, and to suppress a decrease in the reception sensitivity of the GPS antenna 16.

  In the above embodiment, an example in which the GPS antenna 16 is arranged at the 9 o'clock position is shown, but the present invention is not limited to this. For example, assuming that a left-handed user wears a wrist watch on the right arm, the GPS antenna 16 may be provided at the 3 o'clock position and the GPS module 21 may be disposed at the 9 o'clock position. Further, the GPS antenna 16 may be arranged at the 0 o'clock position, the 6 o'clock position, or the like.

  In the above embodiment, the GPS antenna 16 is arranged in the 9 o'clock direction and the GPS module 21 is arranged in the 3 o'clock direction, so that the GPS antenna 16 and the GPS module 21 are point-symmetric with respect to the pointer shaft 124. Although the arrangement configuration is illustrated, the present invention is not limited to this. For example, the GPS antenna 16 may be arranged in the 9 o'clock direction and the GPS module 21 may be provided at the 4 o'clock position. Even in such a case, since the GPS antenna 16 and the GPS module 21 are arranged apart from each other in plan view, the influence of in-band noise can be reduced as compared with a configuration in which they are provided adjacent to each other.

Furthermore, although the configuration in which the GPS antenna 16 and the GPS module 21 are arranged on the same circuit board 20 is illustrated, a configuration in which the GPS antenna 16 and the GPS module 21 are arranged on different boards may be employed.
Further, although the example in which the GPS antenna 16 and the GPS module 21 are arranged on the surface corresponding to the dial plate 11 of the circuit board 20 has been shown, a configuration may be adopted in which the GPS antenna 16 and the GPS module 21 are arranged on the surface facing the back cover 15.
Further, the GPS antenna 16 may be disposed on the dial 11 side of the circuit board 20 and the GPS module 21 may be disposed on the back cover 15 side, and may not be disposed on the same plane. In this case, the thickness dimension of the wristwatch 1 may be increased, but the positions of the GPS module 21 and the GPS antenna 16 can be further separated. Therefore, the influence of the in-band noise generated in the GPS module 21 can be further reduced, and the decrease in the reception sensitivity of the GPS antenna 16 can be more reliably suppressed.

Moreover, although the exterior case 13 of the housing | casing 10 showed the example comprised by a nonelectroconductive material, when receiving only the satellite signal from the surface glass 140 side, the exterior case 13 is made of a conductive material such as metal. It may be configured.
Further, in the above embodiment, the wristwatch 1 is exemplified as the portable electronic device, and the satellite signal is received from the surface glass 140 side. However, for example, from the back cover 15 side or the outer case 13 side (side). When the satellite signal can be received, the dial 11 may be made of a conductive material.

  The portable electronic device of the present invention is not limited to an analog timepiece having hands, but may be applied to a combination timepiece having hands and a display, or a digital timepiece having only a display. Furthermore, the present invention is not limited to wristwatches, and is applied to various portable watches such as pocket watches, and various portable information terminals such as cellular phones, digital cameras, PNDs (personal navigation devices), car navigation systems, and the like. Also good.

The power generation device is not limited to the solar panel 17 and may be a device that operates a generator with a rotating weight. Further, the battery 18 may be charged with electric power from an external power source, for example, an outlet, without providing the power generation device in the wristwatch 1.
Further, the power source is not limited to a rechargeable secondary battery, and may be a primary battery.

  Moreover, although the above-mentioned embodiment demonstrated the GPS satellite as an example of a position information satellite, not only a GPS satellite but a Galileo (EU), GLONASS (Russia), Hokuto (China) as a position information satellite of this invention. Other global navigation satellite systems (GNSS), etc., or position information satellites that transmit satellite signals including time information such as geostationary satellites such as SBAS and quasi-zenith satellites may be used.

  DESCRIPTION OF SYMBOLS 1 ... Wristwatch (portable electronic device), 2 ... GPS satellite (positional information satellite), 10 ... Housing, 11 ... Dial (display unit), 11A ... Display surface, 12 ... Pointer, 13 ... Exterior case (housing) 16 ... GPS antenna (antenna), 16A ... upper surface, 16B ... side surface, 20 ... circuit board (substrate), 21 ... GPS module (receiving circuit), 124 ... pointer shaft.

Claims (8)

An antenna for receiving a satellite signal transmitted from a position information satellite;
A receiving circuit for processing the received satellite signal;
A portable electronic device comprising a display unit for displaying predetermined information,
The antenna and the receiving circuit are arranged on the back side opposite to the display surface of the display unit, and the portable electronic device is viewed from the observation direction in which the information displayed by the display unit is observed. A portable electronic device characterized in that the electronic devices are spaced apart from each other. The portable electronic device according to claim 1,
A portable electronic device comprising a substrate on which the antenna and the receiving circuit are provided. The portable electronic device according to claim 2, wherein
The portable electronic device, wherein the antenna and the receiving circuit are arranged on the same surface of the substrate. The portable electronic device according to any one of claims 1 to 3,
The display unit
A guideline for displaying the information;
A pointer shaft that is positioned at the center of the display unit as viewed from the observation direction and holds the pointer;
The portable electronic device, wherein the antenna and the receiving circuit are arranged at positions that are point-symmetric with respect to the pointer axis when viewed from the observation direction. The portable electronic device according to any one of claims 1 to 4,
When observing the display unit from the viewing direction, the display unit has a dial with an upward direction of 0 o'clock, a right direction of 3 o'clock, a down direction of 6 o'clock, and a left direction of 9 o'clock. And
The portable electronic device, wherein the antenna is arranged at a position corresponding to the 9 o'clock direction of the dial. The portable electronic device according to any one of claims 1 to 5,
A housing for housing the antenna and the receiving circuit;
The antenna includes an upper surface facing the display unit, and a side surface adjacent to the upper surface,
The housing has a side surface facing the side surface of the antenna,
The said side part is comprised with the nonelectroconductive material. The portable electronic device characterized by the above-mentioned. The portable electronic device according to any one of claims 1 to 6,
A region that overlaps with the antenna when viewed from the observation direction is made of a non-conductive material. The portable electronic device according to any one of claims 1 to 7,
The portable electronic device, wherein the antenna is a patch antenna.

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