JP2006047234A - Timepiece with radio function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a power generating amount in a timepiece with a small-sized radio function, having a solar battery as the power source. <P>SOLUTION: The timepiece with the radio function 1 comprises a cover glass 92 attached to a surface side opening of an external facing case 91, a rear cover 93 attached to a rear face side opening, and a timepiece body and the solar battery stored in the external facing case 91. The timepiece body includes a wireless communication means for receiving electric waves by using an antenna 21, a secondary power source 72 storing generating power, and a time display means driven by stored power. The rear cover 93 comprises a glass 932 transmitting light. The solar battery comprises a first battery 711 generating power by light incident via a cover glass 92, and a second solar battery 712 generating power by a light incident via the glass 932 of the rear cover 93. Since the solar battery 712 is provided on not only the surface side of the timepiece but also the rear face side, the small-sized timepiece can be improved of the power generating amount, and the timepiece having the radio function can be attained. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a wireless function watch that can receive or transmit wireless information, such as a radio-controlled timepiece that receives external wireless information including time information and performs processing such as time correction.

A radio-controlled timepiece that receives time information from the outside and corrects the time is known that uses a solar cell as a power source (see, for example, Patent Document 1).
In this radio-controlled timepiece, a solar cell is provided on the dial side of the timepiece, and processing such as radio wave reception is performed using the solar cell as a power source.

WO 97/21153 pamphlet

  However, the size of the solar cell is limited by the size of the dial. In particular, a small wristwatch for women has a problem that the amount of power generation is small because the area of the solar cell is small. For this reason, energy balance is an issue for radio timepieces that consume more power than normal timepieces for radio wave reception processing, so it is difficult to realize a radio time correction watch that uses a solar cell as the power source for a small wristwatch. there were.

Such a problem is not limited to the radio-controlled timepiece, but is a problem common to various types of timepieces having a wireless communication function.
An object of the present invention is to provide a wireless function watch that can improve power generation in a small wireless function watch that uses a solar cell as a power source.

  The wireless function watch of the present invention is housed in the exterior case having a cylindrical shape, a windshield attached to the opening on the front side of the exterior case, a back cover attached to the opening on the back side, and A watch body and a solar battery housed in the outer case, the watch body receiving or transmitting external wireless information using an antenna, and power generated by the solar battery. A power storage unit that stores power; and a time display unit that is driven by the power stored in the power storage unit, wherein at least a part of the back cover is formed of a translucent member that transmits light, and the solar cell Is arranged on the windshield side of the watch body and generates power by light incident through the windshield, and is arranged on the back cover side of the watch body and is incident through the translucent member of the back cover. Second to generate electricity with light And it is characterized in that it is constituted by a solar cell.

  In the present invention, in addition to the first solar cell that generates power using light incident through the windshield, a second solar cell that generates power by using light incident through the translucent member of the back cover is provided. That is, the first and second solar cells are provided on the front side and the back side of the watch body (analog watch movement or digital display watch module). For this reason, for example, if the watch is placed sideways so that not only the front side (windshield side) but also the back side (back cover side) of the watch is exposed to light, the first and second solar cells Both can generate electricity. Therefore, the area of the solar cell can be increased without increasing the size of the timepiece as compared with the case where only the first solar cell is provided as in the conventional timepiece. For this reason, even in a small timepiece, the amount of power generation can be improved, and processing with a large amount of power consumption such as reception and transmission of external wireless information can be realized. Accordingly, it is possible to realize a radio-controlled timepiece that can be used as a female wristwatch, which has been difficult to realize in the past.

Here, it is preferable that the exterior case is made of metal, and the translucent member of the back cover and the second solar cell are made of a non-conductive member through which the external wireless information can pass.
If the outer case is made of metal, the design of the timepiece can be improved and a high-quality timepiece can be obtained compared to the case made of plastic. In addition, since external wireless information such as standard radio waves can pass through the translucent member of the back cover and the second solar cell made of a non-conductive member, the antenna includes the translucent member and the second solar cell. External wireless information can be received or transmitted through the battery. Therefore, since it is difficult to send and receive external wireless information through the exterior case part because the exterior case is made of metal, it is possible to send and receive external wireless information through the back cover and the second solar cell, A decrease in reception sensitivity can also be prevented.

The exterior case is made of metal, and a dial plate is provided on a windshield side or a watch body side of the first solar cell, and the external wireless information passes through the windshield, the dial plate, and the first solar cell. It is preferable that it is made of a possible non-conductive member.
If the exterior case is made of metal, the design of the watch can be improved and a watch with a high-class feel can be obtained. In addition, since the windshield, the dial plate, and the first solar cell are made of a non-conductive member, the antenna can receive and transmit external wireless information via the windshield, the dial plate, and the first solar cell. . Therefore, even if it is difficult to send and receive external wireless information through the exterior case portion because the exterior case is made of metal, external wireless information can be sent and received through a windshield, etc. Can be prevented.
In addition, if the windshield, dial and first solar cell, and the translucent member and second solar cell of the back cover are formed of non-conductive members, respectively, the antenna is provided on the front side and back side of the watch. External wireless information can be received or transmitted from both, and reception sensitivity can be further improved.

Further, it is preferable that a watch band is connected to two opposing portions of the outer case, and the axial direction of the antenna is substantially parallel to a direction connecting the portions of the outer case to which the watch band is connected.
For example, in an analog wristwatch equipped with a 12-hour hand, the watch band is connected to the 12 o'clock direction and 6 o'clock direction of the outer case, so the antenna axial direction is 12 o'clock direction and 6 o'clock of the outer case. It is almost parallel to the direction connecting the directions. In such a timepiece, the 9 o'clock side or 3 o'clock side of the outer case is on the lower side so that light strikes both the front surface side (windshield side) and the back surface side (back cover side) of the outer case. Alternatively, when the exterior case is placed sideways with the 9 o'clock side facing up, the axial direction of the antenna is substantially parallel to the placement surface of the exterior case, that is, substantially in the horizontal direction.
Therefore, the axial direction of the antenna substantially coincides with the direction of the magnetic field of the standard radio wave received by the radio-controlled timepiece, and the magnetic field component interlinked with the antenna coil is maximized. Therefore, when the exterior case is placed sideways, if the axial direction of the antenna is made substantially parallel to the direction connecting the portions where the watch band of the exterior case is connected, the axial direction of the antenna is compared to other directions. , The best reception performance can be obtained.

Moreover, it is preferable that the second solar cell is disposed in close contact with the clock body side of the translucent member of the back cover and is integrally attached to the back cover.
If the second solar cell is integrally attached to the back cover, the solar cell can be incorporated in accordance with the size of the translucent member of the back cover, so that power can be generated efficiently. Moreover, since the intensity | strength of a solar cell can be reinforced with a translucent member, a solar cell can also be reduced in thickness. Further, since the second solar battery can be attached and detached together with the back cover, for example, a secondary battery or the like as a power storage means arranged on the watch body can be easily replaced.

In addition, it is preferable that the second solar cell is disposed in close contact with the back cover side of the watch body and is integrally attached to the watch body.
If the second solar cell is integrally attached to the watch body, the conduction structure (wiring, etc.) between the solar cell and the power storage means in the watch body can be simplified. Moreover, since the attachment structure to the exterior case of a back cover can be made into a screw type, waterproof performance can be improved.

Here, the first and second solar cells are preferably connected in series.
The first and second solar cells may be connected in parallel, but it is preferable to connect them in series in terms of increasing the electromotive voltage.

The back cover is preferably composed of a metal ring and a translucent member mounted in the ring, and the translucent member is preferably composed of glass or plastic.
The entire back cover may be made of plastic, but if it is composed of a metal ring and a translucent member made of glass or plastic, the design can be improved and the metal ring part can be attached to the exterior case. Therefore, the mounting structure can be strengthened.

Furthermore, a voltage detection means for detecting the voltage of the power storage means, and when the voltage of the power storage means is a predetermined value or more, the first and second solar cells or the second solar battery are short-circuited to the power storage means. It is preferable to include a charge control means for controlling the charge amount.
If such a charge control means is provided, the first and second solar cells or the second solar cell are short-circuited by the charge control means when the voltage of the power storage means is equal to or higher than a predetermined value. By flowing the current through the short-circuited portion, the power storage means can be bypassed, and overcharging of the power storage means can be prevented.

  As described above, according to the wireless function watch of the present invention, the amount of power generated by the solar cell can be improved, and the energy balance can be improved in a small wireless function watch using the solar cell as a power source. This has the effect of realizing a small and compact watch with a wireless function.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same constituent elements as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted or simplified.

[First Embodiment]
FIG. 1 is a block diagram showing a configuration of a radio-controlled timepiece 1 as a wireless function timepiece according to the first embodiment of the present invention.
A radio-controlled timepiece 1 of the present invention has a configuration similar to that of a general radio-controlled timepiece, and includes a receiving unit 2 as a wireless communication unit that receives radio waves (external radio information) including time information, and drive control. The circuit unit 3 includes a driving unit 4 that drives a pointer, a counter unit 6 that counts time, a power supply unit 7 that supplies power, and an external input device 8 such as a crown.

The wireless reception means 2 includes an antenna 21 that receives radio waves, a tuning circuit unit 22 that is configured by a capacitor and tuned to radio waves received by the antenna 21, a reception circuit unit 23 that processes information received by the antenna 21, and a reception A time data storage circuit unit 24 that stores time data processed by the circuit unit 23 is provided.
As shown in FIG. 2, the antenna 21 is formed by winding a coil 212 around a magnetic core (antenna core) 211 and, if necessary, is insulated by cationic electrodeposition coating or the like having excellent corrosion resistance. It is.

As shown in FIG. 2, the tuning circuit unit 22 includes two capacitors 22A and 22B connected in parallel to the antenna 21, and one capacitor 22B is connected to the antenna 21 via the switch 22C. Has been.
The frequency of the radio wave received by the antenna 21 is switched by turning on or off the switch 22C according to a frequency switching control signal output from the drive control circuit unit 3. As a result, for example, in Japan, two types are output from the standard radio wave output station of Otakado and Mt. (East Japan) with a transmission frequency of 40 kHz and the standard radio wave output station of Mt. Hagane (West Japan) with a transmission frequency of 60 kHz. It is configured to be able to switch and receive a long wave standard radio wave having a frequency of. It is also possible to switch between US standard radio waves (60 kHz) and German standard radio waves (77.5 kHz) for reception.
In this embodiment, when the switch 22C is turned on, it tunes to a lower frequency among selectable frequencies, and when it is turned off, it tunes to a higher frequency. The switch 22C is composed of a transistor and is built in a receiving IC 81 described later.

The receiving circuit unit 23 amplifies a long wave standard radio signal received by the antenna 21, a bandpass filter 232 that extracts only a desired frequency component from the amplified long wave standard radio signal, and a long wave standard radio signal. A demodulation circuit 233 for smoothing and demodulating, an AGC (Automatic Gain Control) circuit 234 for controlling the gain of the amplification circuit 231 and controlling the reception level of the long wave standard radio wave signal to be constant regardless of the electric field strength; And a decoding circuit 235 that decodes and outputs the demodulated long-wave standard radio signal.
The time data received and signal-processed by the receiving circuit unit 23 is output to and stored in the time data storage circuit unit 24 as shown in FIG.
The reception circuit unit 23 is driven and controlled based on a reception control signal (power-on control signal) output from the drive control circuit unit 3 by a preset schedule, a forced reception operation by the external input device 8, or the like. For example, the reception operation is performed when the reception control signal is at the Hi level, and the reception data is output from the reception circuit unit 23 to the time data storage circuit unit 24. The reception operation is stopped when the reception control signal is at the Lo level.
Note that the current consumption when the receiving circuit unit 23 is operating is approximately 100 μA, which is a current consumption amount that is nearly 200 times that during normal operation of the timepiece (at the time of the hand movement operation).

  As shown in FIG. 1, the drive control circuit unit 3 receives the pulse signal from the pulse synthesis circuit 31. The pulse synthesizing circuit 31 divides a reference pulse from a reference oscillator 311 such as a crystal oscillator to generate a clock pulse, and generates a pulse signal having a different pulse width and timing from the reference pulse.

  The drive control circuit unit 3 outputs a second drive pulse signal PS1 that is output once per second to drive the second hand, and an hour / minute drive pulse signal PS2 that is output once per minute to drive the hour / minute hand. 41, output to the hour / minute driving circuit 42 to control the driving of the hands. That is, each drive circuit 41, 42 drives a second motor 411, which is a stepping motor driven by a pulse signal from each circuit 41, 42, and an hour / minute motor 421, thereby being connected to each motor 411, 421. The second hand, the minute hand and the hour hand are driven. Each pointer, motors 411 and 421, and drive circuits 41 and 42 constitute time display means for displaying the time. In addition, as a time display means, you may drive an hour hand, a minute hand, and a second hand with one motor.

The counter unit 6 includes a second counter circuit unit 61 that counts seconds and an hour / minute counter circuit unit 62 that counts hours and minutes.
The second counter circuit unit 61 includes a second position counter 611, a second time counter 612, and a coincidence detection circuit 613. The second position counter 611 and the second time counter 612 are both 60 counts, that is, a counter that loops in 60 seconds when a 1 Hz signal is input. The second position counter 611 counts the drive pulse signal (second drive pulse signal PS1) supplied from the drive control circuit unit 3 to the second drive circuit 41. That is, the position of the second hand indicated by the second hand is counted by counting the drive pulse signal for driving the second hand.
The second time counter 612 normally counts a 1 Hz reference pulse signal (clock pulse) output from the drive control circuit unit 3. When the time data is received by the receiving means 2, the counter value is corrected according to the second data of the time data.

Similarly, the hour / minute counter circuit unit 62 includes an hour / minute position counter 621, an hour / minute time counter 622, and a coincidence detection circuit 623. Both the hour / minute position counter 621 and the hour / minute time counter 622 are counters that loop when signals for 24 hours are input. The hour / minute position counter 621 counts the drive pulse signal (hour / minute drive pulse signal PS2) supplied from the drive control circuit unit 3 to the hour / minute drive circuit 42, and counts the position of the hour / minute hands indicated by the hour hand and minute hand. is doing.
The hour / minute time counter 622 normally counts a 1 Hz pulse (clock pulse) output from the drive control circuit unit 3 (more precisely, 1 count is counted when 1 Hz is counted 60 times). When the time data is received by the receiving means 2, the counter value is corrected according to the hour / minute data of the time data.

The coincidence detection circuits 613 and 623 detect the coincidence of the count values of the position counters 611 and 621 and the time counters 612 and 622 and output a detection signal indicating whether or not they coincide to the drive control circuit unit 3. To do.
When the mismatch signal is input from the match detection circuits 613 and 623, the drive control circuit unit 3 continues to output the drive pulse signals PS1 and PS2 until the match signal is input. For this reason, during normal hand movement, when the counter values of the time counters 612 and 622 are changed by the reference signal of 1 Hz from the drive control circuit unit 3 and do not coincide with the position counters 611 and 621, the drive pulse signals PS1 and PS2 are As each pointer is output and moved, the position counters 611 and 621 coincide with the time counters 612 and 622. By repeating this operation, normal hand movement control is performed.
When the time counters 612 and 622 are corrected with the received time data, the drive pulse signals PS1 and PS2 are continuously output until the counter values of the position counters 611 and 621 coincide with the counter values. Is fast-forwarded and corrected to the correct time.
Note that the driving control of the pointer described above is not limited to control using hardware such as the counter unit 6 or the like, and may be controlled by a CPU and software.

The power supply means 7 includes a power generation device 71 as a power generation means constituted by a solar cell (solar generator), and a high-capacity secondary power source 72 as a power storage means for storing the power generated by the power generation device 71. Configured. As the high capacity secondary power source 72, a secondary battery such as a lithium ion battery can be used.
The external input device 8 as an external input means includes a crown and is used for performing a receiving operation, time adjustment, and the like.
In the present embodiment, a movement (clock body) is configured by including the wireless reception unit 2, the drive control circuit unit 3, the drive unit 4, the counter unit 6, and the high-capacity secondary power source 72.

Next, a specific structure of the radio-controlled timepiece 1 will be described.
As shown in FIGS. 3 to 5, the radio-controlled timepiece 1 includes an exterior case (trunk) 91 formed in an approximately cylindrical shape, a cover glass (windshield) 92 mounted on the surface side of the exterior case 91, and an exterior A back cover 93 is detachably attached to the back side of the case 91.
The exterior case 91 is made of a metal material such as stainless steel, brass, or titanium. The movement including the antenna 21 and the high-capacity secondary power source 72 is incorporated in the outer case 91.
That is, in the outer case 91, the circuit board 80 to which the capacitors 22A and 22B, the receiving IC 81, the CPU 82, the reference vibrator 311 and the like are attached, the high-capacity secondary power source 72 constituting the power storage means, and the driving means 4 are provided. A watch body (movement) in which the motors 411, 421 and the like are incorporated is incorporated. The reception IC 81, the CPU 82, and the like constitute the reception circuit unit 23, the drive control circuit unit 3, and the counter unit 6.

  The antenna 21 may be a rod-like (straight) like a general bar antenna, but in this embodiment, an antenna curved in a plane arc shape is used as shown in FIG. The antenna 21 is arranged along the circumferential inner peripheral surface 91 </ b> A of the outer case 91. That is, as shown in FIG. 3, the planar shape of the magnetic core 211 of the antenna 21 is formed in an arc shape that is substantially concentric with the inner peripheral surface 91 </ b> A, and the coil 212 is wound around the magnetic core 211 to form a substantially circular plane. It is configured in an arc.

The magnetic core 211 of the antenna 21 is made of ferrite, laminated amorphous foil, or the like. When the magnetic core 211 is formed of a laminated amorphous foil, for example, a cobalt-based amorphous foil (eg, amorphous foil of Co 50 wt% or more) is punched out with a mold, or about 10 to 30 pieces formed by etching are bonded. A material whose magnetic properties are stabilized by heat treatment such as superposition and annealing can be used. The magnetic core 211 may be configured by laminating a planar arc-shaped amorphous foil in the thickness direction of the watch.
In the case where the magnetic core 211 is made of ferrite, it may be manufactured by molding with a mold or the like and heat treatment. If the core 211 is made of ferrite, it is less expensive than the case where an amorphous stay is used. However, it is advantageous in terms of performance when the outer casing 91 is made of metal when the core 211 is made of amorphous material because the holding power is weaker than when the core 211 is made of ferrite.

  Here, since the thickness of the amorphous foil constituting the magnetic core 211 is usually about 0.01 mm to 0.05 mm, for example, when 30 sheets are stacked, the thickness dimension of the magnetic core 211 in the stacking direction is set. Is about 0.3 to 1.5 mm. Since the amorphous material has better magnetic characteristics than ferrite, a smaller and thinner antenna 21 can be realized. Since antenna characteristics are affected by the volume of the core, the antenna area must be increased or the antenna length (core length) must be increased in order to maintain the antenna characteristics by making the antenna thinner. There is. For example, the magnetic core 211 may have a width of about 0.5 to 3.0 mm and a length of about 15 to 30 mm. If the thickness of the amorphous metal plate is greater than 0.05 mm, it is difficult to quickly cool the central portion of the plate pressure, so that the metal is crystallized without being amorphized. That is, in order to produce an amorphous metal, it is necessary to perform a rapid cooling operation before the metal is crystallized. For this purpose, the thickness of the metal must be reduced. In addition, when the thickness of the amorphous metal plate is less than 0.01 mm, the strength of the amorphous metal plate is weakened and easily deformed during assembly work, etc., so that it is very difficult to position the parts and handle the parts. .

The coil 212 of the antenna 21 requires an inductance value of about 10 mH when receiving a long wave standard radio wave (40 to 77.5 kHz). For this reason, in this embodiment, the coil 212 is formed by winding a uremet wire having a diameter of about 0.1 μm for several hundred turns. In the present embodiment, the coil 212 is not wound up to the end surface of the core 211 in order to facilitate the winding operation of the coil 212 and prevent the end portion from being wound. Milli) Winding up to a distant position. Therefore, a portion where the coil 212 is not wound exists at the end of the core 211.
Further, the winding method of the coil 212 is not particularly limited, and random winding may be used, but aligned winding is particularly preferable. If the aligned winding is employed, there is no useless space between the coil wires, and the coil volume for obtaining the same inductance value can be reduced. In this embodiment, since the core 211 has a planar arc shape, the antenna 21 is manufactured as follows. First, a coil of a self-bonding electric wire is wound around a bobbin, and then the coil is hardened by dipping in heat or a solution. After the coil is solidified, the bobbin is pulled out, and the magnetic core 211 is inserted into a through-hole portion formed by pulling out the bobbin. The antenna may be configured by inserting a core into a bobbin wound with a coil. In this case, the size is increased by the presence of the bobbin, but the antenna can be easily manufactured.

The antenna 21 is fixed to the base plate of the movement using a thermoplastic resin (hot melt), an ultraviolet curable epoxy, or the like. Moreover, in order to give the function as a buffer material of the antenna 21, it may be fixed using an elastic sealing material.
The antenna 21 and the receiving IC 81 are connected by two wires. That is, the antenna 21 and the receiving IC 81 are electrically connected by taking out the coil 212 from the end of the antenna and soldering it to the circuit board 80. The electrical connection may be performed by attaching a flexible substrate made of polyimide or the like to the antenna 21 and screwing the substrate to the circuit board 80.

Since the outer case 91 is made of metal, an intermediate frame made of an insulating material such as plastic is provided between the inner peripheral surface 91A of the outer case 91 and the antenna 21 in order to insulate the outer case 91 from the antenna 21. 96 is generally provided. Providing the plastic inner frame 96 makes it easier for magnetic flux to enter the antenna 21, thereby improving reception characteristics.
Further, as shown in FIG. 3, the metal members such as the secondary power source 72 and the motors 411 and 421 are arranged at positions away from the antenna 21 in order to improve reception characteristics. . Furthermore, it is preferable that the CPU 82 and the reference vibrator 311 that are noise sources are also arranged away from the antenna 21 to some extent.
On the other hand, the tuning circuit unit 22 and the receiving IC 81 including capacitors are arranged close to the antenna 21 in order to reduce wiring loss.

  Further, although the arrangement position of the antenna 21 in the outer case 91 is not limited, it is preferably arranged in the 9 o'clock direction (9 o'clock side) with respect to the center point of the dial plate 95 as shown in FIG. If the antenna 21 is arranged in the 3 o'clock direction of the dial plate 95, it interferes with the crown as the external input device 8 and the layout of the antenna 21 becomes difficult. However, if the antenna 21 is arranged in the 9 o'clock direction of the dial plate 95, Interference with the crown which is the external input device 8 can be easily prevented.

As shown in FIGS. 4 and 5, the first solar cell 711 is arranged on the surface side of the movement, that is, the cover glass 92 side, and the dial plate 95 is arranged on the cover glass 92 side of the first solar cell 711. Has been.
The dial plate 95 is a non-conductive member (electrical insulator) such as plastic or shellfish, and is made of a material that is light transmissive and that also allows radio waves to pass through.

  The first solar cell 711 is configured by a solar cell capable of passing radio waves such as a solar panel of a type in which an amorphous silicon layer thin film is laminated on a substrate made of an organic resin film.

The back cover 93 includes a metal ring 931 made of stainless steel, titanium, or the like, and a glass 932 that is a translucent member fitted in an opening in the ring 931. Note that the ring 931 is not limited to glass but may be plastic or the like. The ring 931 has a light-transmitting property, is non-conductive (electrical insulator), and can pass radio waves. A member may be used.
The back cover 93 is detachably attached to the exterior case 91 with screws 933 that are screwed into the exterior case 91 via a ring 931.

A second solar cell 712 is disposed inside the outer case 91 of the back cover 93, that is, on the movement side. Similar to the first solar cell 711, the second solar cell 712 is a solar cell capable of passing radio waves such as a solar panel in which an amorphous silicon layer thin film is laminated on a substrate made of an organic resin film. It is configured.
The second solar cell 712 is attached in close contact with the glass 932 of the back cover 93. Two coil springs 713 for conduction are arranged between the second solar cell 712 and the movement. Therefore, the current generated by the second solar cell 712 is supplied to the secondary power source 72 of the movement via the coil spring 713.

As shown in FIG. 6, the first solar cell 711 includes three solar cells 711A to 711C. Each of the solar cells 711 </ b> A to 711 </ b> C is formed in a substantially fan shape on a plane. The solar cell 711A has an opening 715 that exposes the date wheel and displays the date.
The second solar cell 712 is composed of one solar cell (not shown). Usually, the second solar cell 712 is less likely to receive light and has lower illuminance than the first solar cell 711. For this reason, the second solar cell 712 is composed of one solar cell having substantially the same area as the glass 932 of the back cover 93. Therefore, the area of one solar cell of the second solar cell 712 is larger than that of each of the solar cells 711A to 711C of the first solar cell 711.

  In this embodiment, as shown in FIG. 7, the solar cells 711A to 711C and the second solar cell 712 are connected in series. Since the electromotive voltage of each solar cell is about 0.5 V per sheet, an electromotive voltage of about 2 V can be obtained by connecting four stages of solar cells in series. Therefore, in a timepiece designed to be driven by a power supply of 1.5 V, four stages of solar cells may be connected in series as in this embodiment. In addition, a timepiece driven by a 3V power source may be configured so that six solar cells are provided and connected in six stages in series. For example, the first solar cell 711 is composed of 4 to 5 solar cells, the second solar cell 712 is composed of 1 to 2 solar cells, and a total of 6 cells are prepared. These cells may be connected in series.

The drive control circuit unit 3 controls the amount of charge to the secondary power supply 72 according to the detected value of the power supply voltage detection circuit 301 and the detection value of the power supply voltage detection circuit 301 that functions as voltage detection means for detecting the voltage of the secondary power supply 72. And a charge control circuit 302. Between the secondary power source 72 and the overcharge prevention transistor 303, a diode 304 for preventing a backflow is provided.
The charge control circuit 302 controls on / off of the overcharge prevention transistor 303 connected in parallel with the solar cells 711 and 712 and the secondary power source 72. That is, when the voltage of the secondary power supply 72 exceeds a predetermined value in the power supply voltage detection circuit 301, the charge control circuit 302 turns on the overcharge prevention transistor 303 to short-circuit the solar cells 711 and 712, and the solar cells 711 and 712. Is controlled so as to bypass the secondary power source 72, thereby preventing overcharging of the secondary power source 72.

  When the power supply voltage is set to 1.5 V, the secondary power source 72 is usually a lithium ion secondary battery. In this case, the charging control circuit 302 controls the overcharge prevention transistor 303 so as to suppress the maximum charging voltage of the secondary power source 72 to about 2.4V.

As shown also in FIG. 8, at two opposing positions of the outer case 91, usually at the 12 o'clock direction and 6 o'clock direction on the dial plate 95, there are connecting protrusions 94 for connecting the watch band 97. Each is protruding.
The watch band 97 is configured by connecting a plurality of piece members so as to be rotatable with pins (spring bars or the like). The piece member at the end is also connected to the connecting projection piece 94 of the outer case 91 by a pin so as to be rotatable.

In such a configuration, as shown in FIG. 5, the magnetic field component that is part of the radio wave enters the exterior case 91 from the cover glass 92 or the glass 932, and the core 211 of the antenna 21 is connected to one end thereof. To the other end. Then, an alternating current is induced in the coil 212 wound around the core 211, and accordingly, an alternating voltage is generated at both ends of the coil 212. Then, this AC voltage flows to the reception circuit unit 23 as an analog reception signal.
The analog reception signal is subjected to processing such as amplification, demodulation, and decoding by the reception circuit unit 23 to obtain digital time data, which is stored in the time data storage circuit unit 24.

That is, the antenna 21 has directivity that reacts to a magnetic field in an extension line direction (an axial direction of the core 211 and the coil 212) connecting the end portions of the core 211. Therefore, if the metal outer case 91 is disposed close to the core 211 or the coil 212 in the axial direction, the magnetic field interlinking the coil 212 is hindered, and therefore the antenna characteristics (reception sensitivity) of the antenna 21 are reduced. descend. On the other hand, in the present embodiment, as described above, the core 211 and the coil 212 are formed in a planar arc shape, and the end portions thereof are arranged along the inner peripheral surface 91A. The distance to the metallic outer case 91 can be made relatively large, and the radio wave reception sensitivity of the antenna 21 can be improved.
Further, the secondary power source 72, the motors 411 and 421, the reference vibrator 311 and the CPU 82 are also separated from the antenna 21 so as not to affect the interlinkage magnetic field. That is, since the secondary power source 72 and the motors 411 and 421 are made of metal, the interlinkage magnetic field is affected if the secondary power source 72 and the motors 411 and 421 are arranged close to the core 211 like the outer case 91. On the other hand, as the reference vibrator 311, a 32.768 kHz crystal vibrator is used, and since this vibration frequency is close to the long wave reception frequency (40 kHz), the reference vibrator 311 is disposed close to the antenna 21. There is a possibility that a signal is mixed in the antenna 21 as noise. Therefore, the secondary power source 72, the reference vibrator 311 and the like are arranged with a certain distance from the antenna 21 (core 211).

Further, in the present embodiment, when the timepiece 1 is not used, it is preferable to place the watch 1 sideways as shown in FIG. If the timepiece 1 is turned sideways, light can be taken from the glass 932 of the cover glass 92 and the back cover 93, and power can be generated by the first solar cell 711 and the second solar cell 712.
Further, the axial direction of the antenna 21 is substantially parallel to the direction connecting the 12 o'clock direction and the 6 o'clock direction of the exterior case 91. Since the direction of the magnetic field of the standard radio wave is as shown in FIG. 8, when the outer case 91 is placed sideways, the axial direction of the antenna 21 and the direction of the magnetic field of the standard radio wave substantially coincide with each other. The magnetic field component interlinking with the coil 212 of the antenna 21 is maximized. For this reason, in this embodiment, the best reception performance can be obtained when the exterior case 91 is placed sideways.
Here, the axial direction of the antenna 21 is a direction orthogonal to the direction in which the antenna 21 has the strongest directivity for radio wave reception. For example, in the case of a bar antenna in which the antenna is formed in a straight line, it usually means a direction along the longitudinal direction. In the case of an arc-shaped antenna having a planar curved shape, the axial direction of the antenna usually means the tangential direction of the arc at the center between both ends of the antenna. In addition, when the timepiece 1 is turned sideways, the antenna 21 is substantially parallel to the mounting surface such as a desk, so that it is difficult to be affected by the mounting surface, and deterioration of reception sensitivity can be prevented.

The operation of the radio-controlled timepiece 1 having such a configuration will be described.
First, normal time display will be described. Normally, the drive control circuit unit 3 uses the pulse signal (reference signal) input from the pulse synthesizing circuit 31 to send a 1 Hz pulse signal to count up the counter value of the second time counter 612. When the second time counter 612 counts up and differs from the counter value of the second position counter 611, the coincidence detection circuit 613 detects the mismatch and outputs a mismatch signal to the drive control circuit unit 3. The drive control circuit unit 3 outputs the second drive pulse signal PS1 based on the mismatch signal. The second position counter 611 is counted up by the output of the second drive pulse signal PS1, and the second motor 411 is driven through the second drive circuit 41 to drive the second hand. The above processing is performed by the coincidence detection circuit 613 until the values of the counters 611 and 612 coincide. Therefore, at the time of normal hand movement, every time 1 Hz is input to the second time counter 612 and the counter value is incremented by “1”, one second drive pulse signal PS1 is output, and the second hand is stepped every one second. The
Similarly, the hour / minute drive pulse signal PS2 is output from the drive control circuit unit 3 so that the count value of the hour / minute position counter 621 matches the count value counted by the hour / minute time counter 622. In response to the drive pulse signal PS2, the hour / minute drive circuit 42 outputs a pulse signal to the hour / minute motor 421 to drive the hour and minute hands.

Next, the operation when receiving time information will be described.
When the reception start time set is reached, the drive control circuit unit 3 drives the reception circuit unit 23 by driving the reception circuit unit 23 after the drive coils 412 of the motors 411 and 421 are short-circuited to stop the motors 411 and 421, for example. Start receiving information. It is also possible to forcibly start (forced reception) by an operation of starting the reception operation by the external input device 8, but in this case also, when the reception operation is instructed by the external input device 8, the drive control circuit unit 3 First, the drive coil 412 is short-circuited to fix the voltage at a predetermined potential, and then the reception circuit unit 23 is driven to start receiving time information.
When the receiving circuit unit 23 is activated, radio waves (time information) received via the antenna 21 are processed by the receiving circuit unit 23 and then stored in the storage circuit unit 24. At this time, verification of whether the received time data is correct is also performed. Specifically, since the time information of the long wave standard radio wave is data for every minute, it is determined based on whether or not the received time data are data with different one minute intervals.

When the received time information is determined to be correct data, the time data is output to the second time counter 612 and the hour / minute time counter 622 according to the instruction of the drive control circuit unit 3, and the second time counter 612 and the hour / minute time counter 622 are output. The count value is corrected. At this time, the short state of the drive coil 412, that is, the stopped state of the motors 411 and 421 is also released.
When the count values of the time counters 612 and 622 are corrected and become different values from the position counters 611 and 621, the drive control circuit unit 3 causes the coincidence detection circuits 613 and 623 until the count values coincide. Inconsistency signal is received. Then, the drive control circuit unit 3 outputs the drive pulse signals PS1 and PS2 to drive the hands. Since the driving of the pointer is continued by fast-forwarding until each counter value matches, the pointer position is automatically corrected according to the reception time, and the time is adjusted.

The initial settings of the second position counter 611 and the hour / minute position counter 621 are initially set by a user operation. As shown in FIG. 7, a hand position detecting means 5 capable of detecting the position of the pointer is provided. In this case, the counters 611 and 621 can be automatically set to initial values based on the detection result.
These operations may be realized by each means configured by hardware, but may be realized by a CPU and software.

According to the above-described embodiment, the following effects can be obtained.
(1) Since the second solar cell 712 is provided in addition to the first solar cell 711, the timepiece 1 is placed sideways so that not only the front side (windshield side) of the timepiece 1 but also the back side (back cover) If the light is also applied to the side), power can be generated by both the first and second solar cells 711 and 712. Therefore, the area of the solar cells 711 and 712 can be increased without increasing the size of the timepiece 1, and the amount of power generation can be improved. For this reason, even in a small wristwatch for women, it is possible to improve the amount of power generation, and it is possible to realize a radio-controlled timepiece that requires processing with a large amount of power consumption such as reception and transmission of external wireless information.

(2) Since the exterior case 91 is made of metal, the appearance design of the radio-controlled timepiece 1 can be improved, and the radio-controlled timepiece 1 can be provided with less design restrictions and high quality.
In addition, the back cover 93 is provided with a glass 932 which is a non-conductive member, and the second solar cell 712 is formed of a substrate made of an organic resin film. External wireless information can be passed through.
Furthermore, since the cover glass 92, the dial plate 95, and the first solar cell 711 are also made of a non-conductive member, external wireless information can be passed into the exterior case 91 from the front side.
Therefore, since the antenna 21 can receive external wireless information via the cover glass 92 side and the back cover 93 side, it is possible to prevent a decrease in reception sensitivity even if the external wireless information is blocked by the metal exterior case 91 portion. .

(3) Since the second solar cell 712 is provided in close contact with the glass 932 of the back cover 93 and is provided integrally with the back cover 93, the size of the second solar cell 712 is incorporated in accordance with the glass 932. Power generation efficiency can be improved. In addition, since the mechanical strength of the second solar cell 712 can be ensured by the glass 932, it is not necessary to separately provide a reinforcing plate for the solar cell 712, and the thickness can be reduced.
Furthermore, since the solar cell 712 can be attached and detached together with the back cover 93, the secondary power source 72 disposed in the movement can be easily replaced.

(4) Since the first solar cell 711 and the second solar cell 712 are connected in series, the generated voltage can be improved. In particular, in the present embodiment, the first solar cell 711 is composed of three solar cells 711A to 711C, and the solar cells 711A to 711C and the second solar cell 712 are connected in series, so Solar cells will be connected in series. For this reason, even if each cell has an electromotive voltage of about 0.5 V, a power generation voltage of about 2.0 V can be obtained and used as the power supply means 7 of the timepiece 1 driven by a power source of about 1.5 V. .
Further, the first solar cell 711 facing the surface side of the timepiece 1 where the sunlight easily hits and the power generation amount per unit area is large is divided into three solar cells 711A to 711C, and the first solar cell 711 facing the back cover side is divided. Since the second solar cell 712 is composed of one solar cell, it is possible to suppress variations in the amount of power generated by each solar cell and improve power generation efficiency.

  (5) Since the back cover 93 is composed of the metal ring 931 and the translucent glass 932 mounted in the ring, the design of the back cover 93 can be improved. Moreover, since the back cover 93 can be attached to the exterior case 91 at the metal ring 931 portion, the attachment structure can be strengthened.

  (6) Since the power supply voltage detection circuit 301 and the charge control circuit 302 that detect the voltage of the secondary power supply 72 and turn on the overcharge prevention transistor 303 when the voltage exceeds a predetermined voltage are provided, the generated current is short-circuited. The secondary power source 72 can be bypassed. For this reason, overcharge of the secondary power supply 72 can be prevented.

(7) Furthermore, in the above embodiment, the antenna 21 can be bent and disposed close to the inner peripheral surface 91A of the exterior case 91, so that the length of the antenna 21 can be secured to some extent and deterioration of the antenna characteristics can be prevented. The watch 1 can also be reduced in size. Therefore, also in this respect, the radio wave correction watch 1 for women can be easily realized.
In addition, the layout of each IC, battery, and the like arranged inside the case 91 is reduced, and the antenna 21 having a relatively large or many turns can be used, and the antenna sensitivity can be improved.

  (8) Since the antenna 21 is arranged away from the high-capacity secondary power source (secondary battery) 72 and the reference vibrator 311, the influence of the battery 72 and the reference vibrator 311 when receiving radio waves can be reduced, and the antenna characteristics Can be suppressed.

  (9) Since the axial direction of the antenna 21 is substantially parallel to the direction connecting the 12 o'clock direction and the 6 o'clock direction of the exterior case 91, when the exterior case 91 is placed sideways, the axial direction of the antenna 21 and the standard The direction of the magnetic field of the radio wave can be substantially matched, and the magnetic field component linked to the coil 212 of the antenna 21 can be maximized. For this reason, when the exterior case 91 is placed sideways, the reception performance can be improved as compared with the case where the axial direction of the antenna 21 is directed to another direction. That is, according to the present embodiment, the best reception performance can be obtained when the exterior case 91 is placed sideways.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the second embodiment, as shown in FIGS. 9 and 10, the second solar cell 712 is not provided integrally with the back cover 93 but is disposed on the back cover 93 side of the movement and integrated with the movement. Is different from the first embodiment.
In the present embodiment, since the second solar cell 712 is integrated with the movement, there is no need to provide a coil spring 713 for conduction between the second solar cell 712 and the movement as in the first embodiment. There is an advantage that the power supply conduction structure from the second solar cell 712 to the secondary power supply 72 can be simplified.

  In the first embodiment, the screw whose back cover 93 is rotated with respect to the case 91 so that the relative position between the contact portion on the movement side and the contact portion on the second solar cell 712 side with respect to the coil spring 713 does not change. The type of back cover mounting structure cannot be used. On the other hand, in 2nd Embodiment, since the 2nd solar cell 712 is not integrated with the back cover 93, a screw-type back cover can also be used and the waterproof performance can be improved that much.

When the second solar cell 712 is integrated with the movement, the secondary power source 72 may be replaced by removing the second solar cell 712 from the movement. However, in order to simplify the battery replacement, FIG. As shown, the second solar cell 712 may be provided with a cutout 712A that matches the shape of the secondary power supply 72, and the secondary power supply 72 may be detachable from the cutout 712A portion.
The antenna 21 may be a curved one similar to that of the first embodiment, but a linear antenna may be used as shown in FIG.

The present invention is not limited to the above embodiments.
That is, the present invention has been illustrated and described primarily with respect to particular embodiments, but without departing from the spirit and scope of the present invention relative to the embodiments described above. Those skilled in the art can make various modifications.
For example, as shown in FIG. 11, when the overcharge prevention transistor 303 is provided in parallel with the second solar cell 712 and the voltage of the secondary power source 72 exceeds a predetermined value, the second solar cell 712 is short-circuited, You may comprise so that it may charge only with one solar cell 711. In this case, when the second solar cell 712 is short-circuited, the charging voltage of the secondary power source 72 is lowered, and overcharging can be prevented.
The power supply voltage detection circuit 301, the charge control circuit 302, and the overcharge prevention transistor 303 are not essential components, but are preferably provided because they can prevent the secondary power supply 72 from being overcharged.

  Further, a switch for short-circuiting the second solar cell 712 is provided like the overcharge prevention transistor 303 in FIG. 11, so that the solar cell 712 is short-circuited when the second solar cell 712 is not generating power. You may control. When the wristwatch 1 is worn, there is a high possibility that the back cover 93 is in close contact with the arm and the second solar cell 712 is not exposed to light. In this case, charging efficiency can be improved by short-circuiting the second solar cell 712 and connecting only the first solar cell 711 to the secondary power source 72.

  Moreover, the exterior case 91 in the timepiece 1 of the present invention is not limited to a metal case, and for example, may be configured by attaching a metal cover such as stainless steel or titanium to the surface of a plastic case. Further, the outer case 91 may be made of a non-conductive material such as a synthetic resin or ceramic, or may be made of a metal layer formed by subjecting these plastics or the like to a surface treatment such as metallic coating. Good. If the exterior case 91 is made of plastic or the like so as to allow external wireless information to pass therethrough, a solar cell having a structure that blocks the external wireless information can also be used.

In the embodiment, the non-conductive glass 932 and the solar battery 712 are used so that external wireless information (radio waves) can be received from the back cover 93 side. However, radio waves are received only from the cover glass 92 side. If possible, the back cover 93 and the solar cell 712 may be made of a material that does not transmit radio waves.
Furthermore, in the said embodiment, although the back cover 93 was comprised with the metal ring 931 and the glass 932, you may comprise a back cover only with the plastics which have translucency.
That is, the back cover 93 only needs to be capable of transmitting light at least and generating power with the solar cell 712.

  On the other hand, in the above embodiment, the non-conductive glass 92, the dial plate 95, and the solar cell 711 are used so that external wireless information (radio waves) can be received from the cover glass 92 side. If it is only necessary to receive from the side, the cover glass 92, the dial plate 95, and the solar cell 711 may be made of materials that do not transmit radio waves. In other words, the cover glass 92 and the dial plate 95 only need to transmit at least light and can be generated by the solar cell 711.

  In the said embodiment, although each solar cell 711,712 was connected in series, you may connect in parallel.

Furthermore, the present invention is not limited to the analog radio wave correction timepiece 1 and may be applied to a digital radio wave correction timepiece 1A. As shown in FIG. 12, the digital radio-controlled timepiece 1A includes an antenna 21, a receiving circuit unit 23, a time data storage circuit unit 24, a drive control circuit unit 3, a pulse synthesis circuit 31, a power generation device 71, and a secondary battery 72. A configuration similar to that of the radio-controlled timepiece 1 such as an external input device 8 such as a crown is provided. Further, a time counter 630 is provided in the drive control circuit unit 3, and the time data of the time counter 630 is configured to be displayed on the liquid crystal panel 430 as time display means via the drive circuit 43 of the liquid crystal panel. Yes. Note that a display panel using a light emitting diode (LED) may be used instead of the liquid crystal panel (LCD) 430.
Note that the value of the time counter 630 changes according to the pulse signal from the pulse synthesizing circuit 31, and when the time data received by the receiving circuit unit 23 and stored in the time data storage circuit unit 24 is determined to be correct. The time data is updated.

Also in such a digital radio-controlled timepiece 1A, the power generation device 71 includes two solar cells 711 and 712, so that the generated power can be improved and the timepiece can be downsized.
Note that the present invention may be applied to a radio-controlled timepiece having both an analog display and a digital display.

  Further, the radio information received by the antenna 21 is not limited to the long wave standard radio wave including time information. For example, even when receiving time information, a weak radio wave of 300 MHz band, a specific low power radio of 400 MHz band, Bluetooth (Bluetooth) of 2.4 GHz band, or the like may be used as the radio signal. When receiving these radio waves, since the frequency is high, the number of turns of the coil 212 may be small, and the antenna 21 can be made small.

  In addition to the wireless communication using radio waves, other wireless communication methods such as an electromagnetic coupling method and an electromagnetic induction method may be used. Note that the electromagnetic coupling and electromagnetic induction methods require communication devices to be close to each other. However, if a non-magnetic material such as stainless steel is used, it is possible to communicate through a metal part. There exists an advantage which can be comprised with metal, such as.

Furthermore, radio information communicated using the antenna 21 is not limited to time information. For example, an IC card function may be built in the watch 1 and used to transmit and receive information such as train commuter passes and various prepaid IC cards. For example, an IC chip and an antenna may be incorporated in the case 91 so that information can be exchanged by placing a wristwatch close to a ticket gate using a smart card, an entrance / exit management machine, various billing payment machines, or the like. In this case, it is not necessary to insert and remove the IC card separately, and it is only necessary to bring the hand with the watch close to it, so that the operability can be greatly improved.
Accordingly, the antenna 21 incorporated in the outer case 91 of the present invention may be used exclusively for reception as in the case of receiving a standard radio wave, or transmits and receives information like a tag using a non-contact IC. May be used only for transmission, or may be used exclusively for transmission, and these may be appropriately selected according to the type with the wireless function to which the present invention is applied.

  What is necessary is just to use the antenna 21 according to the kind of radio | wireless information to receive or transmit, and the kind is not limited to the thing of the said embodiment. The tuning circuit unit 22 may also be designed according to the type of external wireless information to be received or transmitted. Further, the arrangement position of the antenna is not particularly limited to the above embodiment.

It is a block diagram which shows the structure of 1st Embodiment of this invention. It is a block diagram which shows the structure of the receiving circuit part of the said embodiment. It is a schematic plan view of the movement of the embodiment. It is a schematic sectional drawing of the timepiece of the embodiment. It is explanatory drawing explaining reception of the electromagnetic wave by an antenna. It is a top view which shows a 1st solar cell. It is a circuit diagram which shows the power supply circuit of the said embodiment. It is a perspective view which shows the mounting state of a timepiece. It is a schematic sectional drawing of the timepiece of 2nd Embodiment of this invention. It is a disassembled perspective view of the timepiece of the second embodiment. It is a circuit diagram which shows the modification of a power supply circuit. It is a block diagram which shows the structure of the digital timepiece which is the other modification of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,1A ... Radio wave correction clock, 2 ... Wireless reception means, 3 ... Drive control circuit part, 4 ... Drive means, 6 ... Counter part, 7 ... Electric power supply means, 21 ... Antenna, 22 ... Tuning circuit part, 23 ... Reception Circuit part, 24 ... Time data storage circuit part, 41 ... Second drive circuit, 42 ... Hour and minute drive circuit, 43 ... Drive circuit, 71 ... Power generation device, 72 ... Secondary power supply, 91 ... Exterior case, 92 ... Cover glass, 93 ... back cover, 95 ... dial, 301 ... power supply voltage detection circuit, 302 ... charge control circuit, 303 ... overcharge prevention transistor, 411 ... second motor, 421 ... hour / minute motor, 430 ... liquid crystal panel, 711 ... first 712 ... second solar cell, 931 ... metal ring, 932 ... glass.

Claims (9)

A cylindrical exterior case, a windshield attached to the opening on the front side of the exterior case, a back cover attached to the opening on the back side, a watch body housed in the exterior case, and the interior of the exterior case With solar cells housed in
The timepiece is driven by wireless communication means for receiving or transmitting external wireless information using an antenna, power storage means for storing the power generated by the solar battery, and power stored in the power storage means. A time display means,
At least a part of the back cover is composed of a translucent member that transmits light,
The solar cell is disposed on the windshield side of the watch body, and is disposed on the back cover side of the watch body, and the first solar battery that generates power by light incident through the windshield, A wireless function watch, comprising: a second solar cell that generates electricity by light incident thereon. The wireless function watch according to claim 1,
The outer case is made of metal,
The translucent member of the back cover and the second solar cell are configured by a non-conductive member that allows the external wireless information to pass therethrough. The wireless function watch according to claim 1 or 2,
The outer case is made of metal,
A dial is provided on the windshield side or the watch body side of the first solar cell,
The timepiece with a wireless function, wherein the windshield, the dial, and the first solar cell are made of a non-conductive member through which the external wireless information can pass. The timepiece with a wireless function according to any one of claims 1 to 3,
A watch band is connected to two opposing locations of the outer case,
The radio-controlled timepiece according to claim 1, wherein an axial direction of the antenna is substantially parallel to a direction connecting portions of the outer case connected to a watch band. The timepiece with a wireless function according to any one of claims 1 to 4,
A wireless function watch, wherein the second solar cell is disposed in close contact with a watch body side of a translucent member of a back cover and is integrally attached to the back cover. The timepiece with a wireless function according to any one of claims 1 to 4,
The wireless function watch, wherein the second solar cell is disposed in close contact with a back cover side of the watch body and is integrally attached to the watch body. The wireless function watch according to any one of claims 1 to 6,
The wireless function watch, wherein the first and second solar cells are connected in series. The wireless function watch according to any one of claims 1 to 7,
The back cover is composed of a metal ring and a translucent member mounted in the ring,
The translucent member is made of glass or plastic, and has a wireless function. The wireless function watch according to any one of claims 1 to 8,
Voltage detecting means for detecting the voltage of the power storage means, and when the voltage of the power storage means is equal to or higher than a predetermined value, the first and second solar cells or the second solar battery is short-circuited to charge the power storage means And a charging control means for controlling the timepiece.

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