JP5313954B2 - Radio wave watch - Google Patents

Description

  The present invention relates to a radio wave wristwatch.

  Patent Document 1 describes a GPS wristwatch that receives a satellite signal from a GPS (Global Positioning System) satellite and corrects the time based on GPS time information included in the satellite signal. In this document, as a structure of such a wristwatch, a GPS antenna and a battery are overlapped in the thickness direction of the wristwatch (FIG. 2).

JP 2009-236560 A

  It is an object of the present invention to provide a radio wristwatch that receives radio waves from a satellite such as a GPS satellite and corrects the time, and makes the radio wristwatch thin and compact and has good radio wave reception performance. And

  In order to solve the above problems, a radio-controlled wristwatch according to the present invention includes a battery, a patch antenna that receives radio waves from a satellite, a high-frequency circuit that generates a baseband signal based on the received radio waves, and the baseband A decoding circuit that extracts information from the signal, and a controller that corrects the internal time based on the information about the time included in the information, and in the plan view, the battery and the patch antenna are the center of the radio-controlled wristwatch. The high-frequency circuit and the decoding circuit are arranged on one side of the axis, and the controller is arranged on the other side of the axis.

  According to the present invention, a radio wristwatch that receives radio waves from satellites such as GPS satellites and corrects the time is provided with a radio wristwatch that is thin and compact and has good radio wave reception performance. The

1 is a plan view of a radio-controlled wristwatch according to a first embodiment of the present invention. It is sectional drawing by the AA line of FIG. It is the disassembled perspective view seen from the back cover side of the radio-controlled wristwatch concerning a 1st embodiment. FIG. 3 is a plan view showing a positional relationship among a battery, a patch antenna, a high-frequency circuit, a decoding circuit, and a controller in the radio wristwatch according to the first embodiment. It is a figure which shows the principal part of the cross section by the BB line of FIG. It is the figure which looked at the circuit board from the back cover side. It is a functional block diagram of the radio-controlled wristwatch according to the first embodiment. It is a top view which shows the positional relationship of the battery of the radio wave wristwatch which concerns on 2nd Embodiment, a patch antenna, a high frequency circuit, a decoding circuit, and a controller. It is a figure which shows the cross section of the radio-controlled wristwatch which concerns on the modification of this invention.

  FIG. 1 is a plan view showing a radio-controlled wristwatch 100 according to the first embodiment of the present invention. The figure shows a case 1 that is an exterior of a radio-controlled wristwatch, a dial 2 that is arranged in the case 1, and an hour hand 3, a minute hand 4, and a second hand 5 that are hands indicating time. Further, a crown 6 and buttons 7 are arranged on the side surface of the trunk 1 on the 3 o'clock side for the user to perform various operations. A band fixing portion 8 for fixing the band extends from the side surface of the trunk 1 on the 12 o'clock side and the 6 o'clock side.

  In addition, the design of the radio-controlled wristwatch 100 shown in the figure is an example. In addition to those shown here, for example, the barrel 1 may be square instead of round, and the presence / absence, number, and arrangement of the crown 6 and the button 7 are arbitrary. Further, in the present embodiment, the hands are three hands of the hour hand 3, the minute hand 4, and the second hand 5, but the present invention is not limited to this. The reception status, remaining battery level, pointers for various displays, date display, and the like may be added.

  In this specification, the term radio-controlled wristwatch refers to time information that is a wristwatch and that receives radio waves from the outside and is held inside the wristwatch based on information about the time included in the radio waves. It is used to indicate a wristwatch having a function of correcting a certain internal time.

  2 is a cross-sectional view taken along line AA in FIG. A windshield 9 is attached to the trunk 1 so as to cover the dial 2 of the radio-controlled wristwatch 100, and a back cover 10 is attached to the trunk 1 on the opposite side of the windshield 9. The material of the windshield 9 is a transparent material such as glass, and is nonmagnetic and nonconductive. Moreover, although the material of the trunk | drum 1 and the back cover 10 is not specifically limited, In this embodiment, it is a metal.

  In the present specification, hereinafter, the direction in which the windshield 9 of the radio-controlled wristwatch 100 is arranged (upward direction in FIG. 2) is called the windshield side, and the direction in which the back cover 10 is arranged (downward direction in FIG. 2) is called the back cover side. .

  A solar cell 11 is disposed on the back cover side of the dial plate 2, and power is generated by light incident from the windshield side. Therefore, the dial 2 is made of a material that transmits light to some extent. In the present embodiment, the dial plate 2 is fixed to the base plate 12 by the fixed frame 13 so as to sandwich the solar cell 11. In the present embodiment, the fixing frame 13 is fixed to the main plate 12 by a so-called snap-fastening method, but is not limited thereto, and may be fixed by various methods. A patch antenna 14 is disposed on the back cover side of the dial 2. Therefore, the dial 2 is made of a non-magnetic and non-conductive material, for example, a non-metallic material such as a synthetic resin so as not to prevent reception of radio waves by the patch antenna 14.

  The ground plane 12 is made of a nonmagnetic and nonconductive material such as a synthetic resin, and supports various members such as the patch antenna 14 and the train wheel 15. The patch antenna 14 is provided with a feed pin 16 so as to penetrate the thickness direction thereof, and the windshield side surface serves as a receiving surface 17 for receiving radio waves from the satellite.

  By the way, in general, in a radio timepiece that performs time adjustment using a standard radio wave transmitted from a ground station using a long wave band, a so-called bar antenna in which a coil is wound around a magnetic core such as a ferrite or an amorphous alloy is used. Many. On the other hand, the radio wave wristwatch 100 according to the present embodiment receives a signal transmitted from a satellite using a UHF band having a much higher frequency. For this reason, the patch antenna 14 is used as a small antenna suitable for receiving a UHF band signal.

  Further, a surface on the back cover side on which the car of the base plate 12 is disposed, and is a surface closest to the windshield side, that is, a surface on which a vehicle constituting the train wheel 15 is first attached is illustrated as an attachment reference surface 18. Shown in. The train wheel 15 rotates from a motor to a second hand shaft (second wheel) 19 to which the second hand 5 is attached, a minute hand shaft (second wheel) 20 to which the minute hand 4 is attached, and a hour wheel 21 to which the hour hand 3 is attached. This is a gear mechanism for transmitting power. Reference numeral 22 denotes an hour wheel presser which is a plate for holding the hour wheel 21. Further, in the drawing, a cross section of one coil 23 of a motor for driving the train wheel 15 is shown.

  A circuit board 24 is disposed on the back cover side of the base plate 12, and a battery support frame 25 is disposed on the back cover side. The battery support frame 25 is also preferably made of a synthetic resin and made of a non-conductive material. A battery 26 is supported on the battery support frame 25. In the present embodiment, the battery 26 is a rechargeable secondary battery, and uses a button-type lithium ion secondary battery. And the electric power generated by the solar cell 11 is accumulated. Metal electrode plates 27 and 28 are preferably provided on both surfaces of the battery 26 as both electrodes, and are electrically connected to a wiring pattern provided on the circuit board 24. In the present embodiment, the electrode plate 27 is welded onto the battery 26 and is brought into conduction by being pressed against the circuit board 24. The electrode plate 28 is pressed against the surface of the battery 26 by its elastic restoring force.

  The crown 6 is attached to one end of the winding stem 29, and the crown operation detection unit 30 is assembled to the other end, and it is electrically detected that the user has operated the drawer 6 to be pulled out or rotated. It is supposed to be.

  In the present embodiment, the radio-controlled wristwatch 100 is illustrated as including a secondary battery that is driven by electric power generated by solar power and can store electricity. However, a primary battery may be used instead. In that case, the solar cell 11 is unnecessary. Further, the shape of the battery 26 is not limited to the button type, and is arbitrary. Further, a secondary battery other than the lithium ion secondary battery, for example, a lithium ion capacitor or a nickel metal hydride battery may be used.

  FIG. 3 is an exploded perspective view of the radio-controlled wristwatch 100 according to the present embodiment as viewed from the back cover side. In the figure, in order to show the rough structure of the radio-controlled wristwatch 100, main members, specifically, the dial 2, the solar cell 11, the ground plate 12, the circuit board 24, the patch antenna 14 and the battery support frame 25 are shown. Shown in order of placement. The body, windshield, back cover, crown and buttons, radio wheel 100 and the internal mechanism such as the train wheel and motor, winding stem and crown operation detector, battery, pointer and other members are omitted in the figure. .

  The fixed frame 13 has a generally ring shape and accommodates the dial 2 inside thereof. Further, hooks 31 are appropriately provided on the outer periphery of the fixed frame 13 so as to be fixed to the main plate 12. The position and number of the hooks 31 may be arbitrarily determined as necessary. A shaft hole 32 is provided in the center of the dial 2 so that each pointer shaft and the hour wheel pass therethrough.

  The solar cell 11 has a shape having a notch 33 on one side as shown. The notch 33 is provided at a position corresponding to the patch antenna 14. This is because a metal electrode is formed on the solar cell 11, and thus the influence of the metal electrode on radio wave reception is reduced. Note that, as in the present embodiment, the solar cell 11 itself has a shape that avoids the position corresponding to the patch antenna 14, and the solar cell 11 has a position corresponding to the patch antenna 14 on the solar cell 11. You may make it reduce the influence on the radio wave reception by a metal electrode by not forming an element. Reference numeral 34 denotes a shaft hole through which each pointer shaft and the hour wheel pass.

  An antenna housing portion 35 for housing the patch antenna 14, a train wheel housing portion 36 for placing a train wheel, and a crown operation detecting portion housing portion 37 for housing a crown operation detecting portion are formed on the back cover side surface of the main plate 12. ing. In this embodiment, the antenna accommodating portion 35 is a concave portion as illustrated, and the receiving surface of the patch antenna 14 is arranged at a position close to the windshield. In the vicinity of the center of the antenna accommodating portion 35, an escape hole 38 for accommodating the end portion of the feed pin 16 of the patch antenna 14 is provided. The reason why the antenna housing portion 35 is a recess in the present embodiment is to ensure the rigidity of the ground plane 12, but the antenna housing portion 35 is not necessarily a recess and is a through hole that houses the patch antenna 14. Alternatively, a notch such as a notch 33 provided in the solar cell 11 may be used.

  The train wheel accommodating portion 36 assembles and accommodates a train wheel which is a gear mechanism that decelerates the rotation of the motor and transmits it to each pointer shaft or the hour wheel. Of the train wheel accommodating portion 36, the surface on the back cover side on which the vehicle is arranged and located closest to the windshield side is an attachment reference surface 18 that serves as a reference for attaching the train wheel. In the present embodiment, the surface around the shaft hole 39 through which the second hand shaft 19 and the minute hand shaft 20 pass is the attachment reference surface 18. Since each member constituting the train wheel is sequentially assembled from the back cover side starting from the attachment reference surface 18, most of the members constituting the train wheel are located on the back cover side from the attachment reference surface 18. It becomes. The train wheel accommodating portion 36 is formed with a coil accommodating portion 40 that is a recess or hole for accommodating a motor coil.

  The crown operation detecting unit accommodating portion 37 includes a winding stem hole 41 through which the winding stem passes, and accommodates a switch structure for detecting the pulling amount and the rotating amount of the winding stem that is pulled out and rotated by the operation of the crown. The switch structure, that is, the structure of the crown operation detection unit may be any structure as long as it can detect the operation of the crown.

  Further, a hook receiver 42 that engages with the hook 31 of the fixed frame 13 is provided on the outer periphery of the base plate 12. Also, a boss 43 or positioning pins 44 are provided as appropriate so that the circuit board 24, the patch antenna 14, and the battery support frame 25 can be positioned and fixed with screws and screw pipes. Of course, screws need not necessarily be used for fixing these members, and other methods such as a snapping mechanism or fixing by adhesion such as fixing the dial 2 may also be used.

  On the circuit board 24, a notch 45 that accommodates the patch antenna 14 is formed. In addition, the notch part 45 does not necessarily need to be a notch, and may be a through hole. A high frequency circuit 46 and a controller 47 are mounted on the side of the back cover of the circuit board 24. The high-frequency circuit 46 is a circuit that converts the signal received by the patch antenna 14 into a baseband signal, and the controller 47 controls the operation of the entire radio-controlled wristwatch 100 and measures the time by an internal circuit. In the present embodiment, the high-frequency circuit 46 and the controller 47 are both integrated on one chip, but the present invention is not limited to this. Although not shown in FIG. 3, a decoding circuit that extracts information from the baseband signal is mounted on the back side of the high-frequency circuit 46, that is, on the windshield side of the circuit board 24. In addition, a motor hole 48 that is a hole for arranging a motor is formed on the circuit board 24. The motor hole 48 is mainly provided to accommodate the motor coil and is not essential. The motor hole 48 may be omitted depending on the thickness and arrangement of the motor. A circuit pattern is formed on the surface and inside of the circuit board 24, and the patch antenna 14, the motor, the high-frequency circuit 46, the controller 47, the decoding circuit, and the like are electrically connected. Etc. are arranged on the circuit pattern. In this embodiment, since there are two motors, the number of hands that can be driven independently is two. As an example of such a configuration, for example, the hour hand and the minute hand are operated in conjunction via a gear train, and the second hand is operated independently of the hour and minute hands. Alternatively, the hour hand may be operated independently, and the minute hand and the second hand may be interlocked. The number of motors may be increased and a pointer that operates independently may be added, or the number of motors may be set to 1 and all the pointers may be linked.

  The patch antenna 14 is arranged so that the receiving surface 17 faces the windshield side, and the patch antenna main body is accommodated in the notch portion 45 of the circuit board 24 and the antenna accommodating portion 35 of the ground plane by a metal ground plate 49. To be fixed. At the same time, the ground plate 49 and the feed pin 16 are electrically connected to the circuit board 24, the ground plate 49 is connected to the ground potential, and the feed pin 16 is connected to the high-frequency circuit 46. At this time, the end portion of the power supply pin 16 and the high-frequency circuit 46 are both located on the back cover side with respect to the circuit board 24, and the connection between both is easy.

  The battery support frame 25 is formed with a battery housing part 50 and an electrode plate escape part 51 for releasing the electrode plate welded to the battery. The electrode plate disposed in the electrode plate escape portion 51 is connected to the circuit board 24 through the connection hole 52.

  FIG. 4 is a plan view showing the positional relationship among the battery 26, the patch antenna 14, the high-frequency circuit 46, the decoding circuit 53, and the controller 47 in the radio-controlled wristwatch 100 according to this embodiment described above. This figure is shown from the same viewpoint as in FIG. 1, and the positions of the battery 26, the patch antenna 14, the high frequency circuit 46 and the decoding circuit 53, and the controller 47 are indicated by solid lines and other than those shown for reference. These members are indicated by a two-dot chain line.

  As shown in the figure, the battery 26 and the patch antenna 14 are arranged side by side on an axis 54 passing through the center of the radio-controlled wristwatch 100 and do not overlap in plan view. By doing so, since the battery 26 and the patch antenna 14 which are members having a certain thickness are not overlapped in a plan view, the thickness of the entire radio-controlled wristwatch 100 is reduced. Further, by arranging the battery 26 and the patch antenna 14 on an axis 54 passing through the center of the radio-controlled wristwatch 100, the radio-controlled wristwatch 100 has a small outer shape and a compact size. In the present embodiment, both the battery 26 and the patch antenna 14 are arranged so that the centers thereof pass through the shaft 54. Such an arrangement is the most preferable arrangement in order to make the radio-controlled wristwatch 100 compact. However, the arrangement is not limited to this, and it is sufficient that both are arranged side by side on the shaft 54, and the center does not necessarily pass through the shaft 54. Not necessary. In the present embodiment, the shaft 54 passes through the 3 o'clock and 9 o'clock positions of the radio-controlled wristwatch 100, but is not limited to this. The reason for this arrangement is that the crown 6 is provided at the 3 o'clock position of the radio-controlled wristwatch 100. In this way, the patch antenna 14, the battery 26 and the crown 6 are arranged on the shaft 54 in this order. Will be. The crown 6 is often made of metal, and its size is determined in consideration of user operability and the like. Therefore, depending on the material and size of the crown 6, radio wave reception by the patch antenna 14 can be hindered. Therefore, by arranging the crown 6 on the opposite side of the patch antenna 14 with the battery 26 sandwiched, the influence on reception is reduced. In addition, in this arrangement, since the patch antenna 14 is arranged on the opposite side of the button 7 with the battery 26 interposed therebetween, the influence of the metal leaf spring used for the button 7 is also reduced. As can be understood from the above description, the crown 6 may be located on the battery 26 side with respect to the patch antenna 14, and the patch antenna 14, battery 26, and crown 6 do not necessarily have to be linearly arranged. The button 7 is also preferably located on the battery 26 side with respect to the patch antenna 14. In the radio-controlled wristwatch 100 according to the present embodiment, the crown 6 may be disposed on the 3 o'clock side with respect to the axis passing through 12:00 and 6 o'clock. Depending on the design of the radio-controlled wristwatch 100, the crown 6 may not necessarily be positioned at 3 o'clock. For example, it may be positioned at 12 o'clock, 9 o'clock for left-handed users, Also good. The direction of the shaft 54 is preferably changed according to the position of the crown 6. Of course, if the radio-controlled wristwatch 100 is designed without the crown 6, the orientation of the shaft 54 may be determined in consideration of the arrangement of the buttons 7 and other circumstances.

  As shown in FIG. 4, when the patch antenna 14, the battery 26, and the crown 6 are arranged almost linearly in this order, many metal winding stems and metal members coupled to the crown 6 are used. The crown operation detection unit that is included is disposed at a position that overlaps the battery 26 in a plan view, and the area occupied by the metal member in plan view is reduced, which is advantageous for reception.

  The high-frequency circuit 46 and the decoding circuit 53 are arranged on one side with respect to the shaft 54, in the present embodiment at the 6 o'clock side, and the controller 47 is disposed on the other side with respect to the shaft 54, in the present embodiment at 12 o'clock. Placed on the side. This is due to the difference between the operating frequency of the high frequency circuit 46 and the decoding circuit 53 and the operating frequency of the controller 47. That is, in the radio-controlled wristwatch 100 according to the present embodiment, the high-frequency circuit 46 and the decode circuit 53 must detect and decode the UHF band radio wave received by the patch antenna 14, so that both are operated at a high frequency. There must be. On the other hand, the controller 47 operates the entire radio-controlled wristwatch 100 and the timepiece circuit, and this operating frequency is a low frequency of about 32768 Hz, which is a vibration frequency of a crystal resonator usually used in an electronic timepiece. For this reason, electromagnetic noise from both of the significantly different drive frequencies may adversely affect the operation of each other. However, if circuits with different drive frequencies are distributed to the shaft 54, they are arranged side by side on the shaft 54. The ground plate 49 and the battery 26 of the patch antenna 14 become a large metal member that shields electromagnetic noise, and adverse effects due to the electromagnetic noise are reduced. For this reason, the radio-controlled wristwatch 100 according to the present embodiment has excellent radio wave reception performance.

  In the same figure, the position of the coil 23 of the motor that drives each pointer is indicated by a solid line. As illustrated, each coil 23 is disposed at a position where at least a part thereof overlaps the battery 26 in plan view. In this case, since the magnetic field from the outside is blocked by the metal member constituting the battery 26, malfunction due to the external magnetic field acting on the coil 23 is reduced. This eliminates the need for a magnetic-resistant plate on the back cover side of the coil 23, leading to cost reduction. Of course, in addition to the battery 26, it is optional to appropriately provide a metal plate for shielding an external magnetic field.

  FIG. 5 is a diagram illustrating a main part of a cross section taken along line BB in FIG. 1. In the figure, the body, windshield, and back cover, which are the exterior of the radio-controlled wristwatch 100, are omitted. As shown in the figure, the circuit board 24 is disposed so as to be sandwiched between the ground plane 12 and the battery support frame 25, and a high frequency circuit 46, a decoding circuit 53, and a controller 47 are mounted on the surface thereof. The surfaces of the base plate 12 and the battery support frame 25 are appropriately provided with depressions so as not to interfere with electronic components arranged on the circuit board 24.

  The high-frequency circuit 46 and the decode circuit 53 are arranged relative to both surfaces of the circuit board 24, that is, just on the front and back sides of the circuit board 24, and are connected to each other through through holes provided in the circuit board 24. Is done. With this arrangement, the electrical path connecting the high-frequency circuit 46 and the decode circuit 53 is short, the parasitic capacitance and impedance generated in the electrical path are small, are not easily affected by noise, and are less likely to cause signal distortion. The high frequency circuit 46 is disposed on the back cover side because the connection with the patch antenna is facilitated as described above. The controller 47 is also preferably arranged on the back cover side. This is because it is considered that an electric circuit that can be a noise source should be arranged as far as possible from the receiving surface of the patch antenna.

  However, the arrangement of the high frequency circuit 46, the decoding circuit 53, and the controller 47 is not limited to this. The high frequency circuit 46 and the decode circuit 53 may be disposed on the same surface of the circuit board 24, or a one-chip integrated circuit in which the functions of the high frequency circuit 46 and the decode circuit 53 are integrated may be used. The high frequency circuit 46 and the controller 47 may be disposed on the windshield side surface of the circuit board 24, and the decode circuit 53 may be disposed on the back cover side surface of the circuit board 24.

  By the way, at the time of reception using the patch antenna, it is preferable that a metal member that may be an obstacle to reception should be arranged as far as possible above the receiving surface of the patch antenna (in this embodiment, the windshield side). Conceivable. Therefore, in the radio-controlled wristwatch 100 according to the present embodiment, as shown in FIG. 2, the receiving surface 17 of the patch antenna 14 is disposed so as to be located on the windshield side with respect to the attachment reference surface 18 to which the train wheel 15 is attached. In this way, most of the train wheel 15 including many metal members such as a car is closer to the back cover than the reference mounting surface 18, that is, closer to the back cover than the receiving surface 17 of the patch antenna 14. Therefore, the adverse effect on the radio wave reception by the train wheel 15 is small.

  Further, in the radio-controlled wristwatch 100 according to the present embodiment, the patch antenna 14 and the battery 26 are arranged side by side so as not to overlap each other in a plan view. Therefore, as shown in FIG. It is preferable to arrange the parts so as to overlap each other. By taking such an arrangement, the overall thickness of the radio-controlled wristwatch 100 is reduced.

  FIG. 6 is a view of the circuit board 24 as seen from the back cover side. The figure shows a circuit pattern for connecting the high-frequency circuit 46, the controller 47, and other electronic components. Further, the positions of the notch 45 and the motor hole 48 described above are also shown. A circle indicated by a two-dot chain line in the drawing indicates the position of the battery 26 disposed on the back cover side of the circuit board 24. A test pattern 55 is formed in the region where the battery 26 is disposed. In order to avoid obscuring the figure, in FIG. 6, a part of the test pattern 55 is denoted by a reference numeral. The test pattern 55 is used to test the operation of each member including the circuit board 24 by bringing the probe into contact before assembling the battery 26. The reason for arranging the test pattern 55 in the area where the battery 26 is arranged is that it is desirable not to arrange electronic components in the area where the battery 26 is arranged in order to reduce the thickness of the radio wave wristwatch. This is because the space on the surface of the substrate 24 is vacant.

  In addition, arrangement | positioning of the circuit pattern shown in the figure, various electronic components, etc. is an example, and is not limited to this. The shape and pattern of the circuit board 24 should be appropriately designed according to the specifications of the electronic wristwatch.

  FIG. 7 is a functional block diagram of the radio-controlled wristwatch 100 according to the present embodiment. The radio wave from the satellite received by the patch antenna 14 is converted into a baseband signal by the high frequency circuit 46, and information relating to the time, particularly information indicating the accurate current time is extracted by the decoding circuit 53 and received by the controller 47. Passed. The controller 47 corrects the internal time, which is time information held by the internal clock circuit, based on the received information indicating the accurate current time, and drives the motor 56 based on the internal time. The rotational power generated by the motor 56 is transmitted to the hands (hour hand 3, minute hand 4 and second hand 5) through the train wheel, and the time is displayed.

  In addition, the electric power obtained by the power generation by the solar battery 11 is accumulated in the battery 26. Then, power is supplied from the battery 26 to the high-frequency circuit 46, the decode circuit 53, and the controller 47. The switch 57 is a switch for switching on / off the power supply to the high-frequency circuit 46 and the decode circuit 53, and is controlled by the controller 47. Since the high-frequency circuit 46 and the decode circuit 53 operating at a high frequency consume a large amount of power, the controller 47 turns on the switch 57 to operate the high-frequency circuit 46 and the decode circuit 53 only when receiving radio waves from the satellite. At other times, the switch 57 is turned off to reduce power consumption.

  The reception of radio waves may be performed when a request from the user is made by an input means such as the crown 6 or the button 7, or when a predetermined time is reached. It may be performed based on the elapsed time from the time, the amount of power generated by the solar cell 11, other information indicating the environment around the radio wristwatch 100, or the like.

  Subsequently, a radio-controlled wristwatch 200 according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, since only the arrangement of the members constituting the radio wristwatch 200 is different from the radio wristwatch according to the first embodiment, the same members as those described in the first embodiment are denoted by the same reference numerals. Detailed description thereof will be omitted.

  FIG. 8 is a plan view showing a positional relationship among the battery 26, the patch antenna 14, the high frequency circuit 46, the decoding circuit 53, and the controller 47 in the radio-controlled wristwatch 200. This figure is the same as FIG. 4 in the first embodiment, and the positions of the battery 26, the patch antenna 14, the high-frequency circuit 46, the decoding circuit 53, and the controller 47 are shown by solid lines and shown for reference. Other members are indicated by a two-dot chain line.

  As shown in the figure, also in this embodiment, the battery 26 and the patch antenna 14 are arranged side by side on an axis 54 passing through the center of the radio-controlled wristwatch 100 and do not overlap in a plan view.

  The shaft 54 is substantially parallel to a straight line connecting the pair of band fixing portions 8, that is, a straight line connecting the 12 o'clock position and the 6 o'clock position. In the present embodiment, since the shaft 54 is also a straight line connecting the 12 o'clock position and the 6 o'clock position, both are parallel and coincident with each other. In a wristwatch, a band is usually attached at the 12 o'clock position and the 6 o'clock position. Therefore, the direction of the impact force acting on the wristwatch, for example, the force acting when the wristwatch is struck against something is F in the figure. As indicated by, the direction is often perpendicular to the straight line connecting the pair of band fixing portions 8, that is, the 3 o'clock direction or the 9 o'clock direction. When such an impact force is applied to the radio-controlled wristwatch 200, the battery 26, which is a member having a large mass among the members constituting the radio-controlled wristwatch 200, tends to move inside. The direction of this movement coincides with the direction of the impact force, and in this embodiment, the direction is perpendicular to the straight line connecting the pair of band fixing portions 8, that is, the 3 o'clock direction or the 9 o'clock direction. At this time, if the shaft 54 is substantially parallel to the straight line connecting the pair of band fixing portions 8, the battery 26 moves toward the patch antenna 14 and does not come into contact with the radio-controlled wristwatch 200 due to an external impact. Failure is reduced.

  In addition, there is no particular limitation as to which of the patch antenna 14 and the battery 26 is arranged at the 12 o'clock side, but as shown in the figure, the patch antenna 14 is arranged at the 6 o'clock side and the battery 26 is arranged at the 12 o'clock side. Is preferred. In many wristwatches, a large decoration such as a brand name, a mark, and a character indicating time is often applied at the 12 o'clock position. This is because, if arranged on the hour side, adverse effects on reception due to such decoration are reduced.

  The high-frequency circuit 46 and the decoding circuit 53 are arranged on one side with respect to the shaft 54, in the present embodiment, on the 9 o'clock side, and the controller 47 is disposed on the other side with respect to the shaft 54, in this embodiment, 3 o'clock. Placed on the side. Of course, these arrangements may be reversed. It is also conceivable to reverse the arrangement of the battery 26 and the patch antenna 14.

  Other points of the radio-controlled wristwatch 200 according to the present embodiment are the same as those of the radio-controlled wristwatch according to the first embodiment.

  As described above, in the first embodiment and the second embodiment of the present invention, as shown in FIG. 5, for example, the battery 26 and the patch antenna (not shown) are the center of the radio wave wristwatch 100. The controller 47 is arranged on one side of the axis, and the high-frequency circuit 46 and the decoding circuit 53 are arranged on the other side of the axis. At this time, when the circuit board on which the controller 47, the high-frequency circuit 46, and the decode circuit 53 are mounted has a solid pattern layer as a wiring pattern therein, as described below, further deformation Is possible.

  FIG. 9 is a view showing a cross section of a radio-controlled wristwatch 300 according to a modification of the present invention. In addition, the figure shows the cross section by the cut surface similar to FIG. 5 in 1st Embodiment. The same members as those in the first embodiment and the second embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  Also in this modification, the battery 26 and the patch antenna (not shown) are arranged side by side on an axis passing through the center of the radio-controlled wristwatch 300. Therefore, the battery 26 and the patch antenna which are large metal members along the axis. Therefore, the propagation of noise such as electromagnetic waves in the left-right direction in the figure is blocked at the vicinity of the axis. Further, a solid pattern 58 is formed inside the circuit board 24. Therefore, noise such as electromagnetic waves is also blocked from propagating in the vertical direction in the figure with the solid pattern 58 as a boundary. In this modification, the top, bottom, left, and right in the figure correspond to the windshield side, back cover side, 12 o'clock direction, and 6 o'clock direction of the radio-controlled wristwatch 300, respectively. In addition, the solid pattern 58 such as an electromagnetic wave is set to the ground potential in this modification.

  The above means that four regions that are less susceptible to noise from each other are defined by the axis and the solid pattern 58 in FIG. That is, a section A on the 12 o'clock direction and the back cover side, a section B on the 12 o'clock direction and the windshield side, a section C on the 6 o'clock direction and the back cover side, and a section D on the 6 o'clock direction and the windshield side. Therefore, the controller, the high frequency circuit, and the decoding circuit, which are noise sources in the radio-controlled wristwatch 300 and are easily affected by noise, are overlapped with any three of the four sections A to D. The radio wave wristwatch 300 with less influence of noise can be obtained by disposing it so that it does not become.

  The positions where the controller, the high-frequency circuit, and the decoding circuit are arranged are arbitrary. In particular, as in the first and second embodiments, the high-frequency circuit and the decoding circuit are arranged so as to face both surfaces of the circuit board 24, that is, the section A and the section B in FIG. When arranged in C and section D, the wiring between the high-frequency circuit and the decoding circuit is shortened to suppress parasitic capacitance and impedance, and the circuit driven at a high frequency and the circuit driven at a low frequency are separated. Alternatively, the controller and the decoding circuit may be arranged so as to face both surfaces of the circuit board 24. Also in this case, the wiring connecting the two is shortened, the parasitic capacitance and impedance are suppressed, and a circuit resistant to noise can be obtained.

  In addition, in one viewpoint of each embodiment of the present invention described above, a high-frequency circuit, a decoding circuit, and a circuit board are mounted, and the high-frequency circuit and the decoding circuit are opposed to both sides of the circuit board. Be placed.

  In this way, parasitic capacitance and impedance generated between the high frequency circuit and the decoding circuit are reduced, and the influence of noise is reduced.

  Moreover, in another viewpoint of each embodiment of this invention, a high frequency circuit is mounted in the back cover side of a circuit board.

  If it does in this way, the connection part of a patch antenna and a high frequency circuit will be located in the same side with respect to a circuit board, and both will be easy to connect.

  Moreover, in another viewpoint of each embodiment of the present invention, the coil of the motor that drives the pointer is disposed at a position overlapping the battery in plan view.

  If it does in this way, an external magnetic field will be interrupted | blocked by a battery and the malfunctioning of the motor by an external magnetic field will be reduced.

  In another aspect of each embodiment of the present invention, the radio-controlled wristwatch has a crown, and the patch antenna, the battery, and the crown are arranged in this order in plan view.

  In this way, the crown, which is a metal member having a large volume, is arranged far from the patch antenna and separated from the battery, and the influence caused by the crown during reception by the patch antenna is reduced.

  Further, according to another aspect of each embodiment of the present invention, the radio wristwatch has a pair of band fixing portions for fixing the band, and the axis on which the battery and the patch antenna are arranged side by side passes through the center of the radio wristwatch. Is substantially parallel to a straight line connecting the band fixing portions.

  In this way, the axis on which the battery and the patch antenna are arranged side by side is substantially perpendicular to the direction of the impact applied to the radio wristwatch from the outside, so that when the impact is applied from the outside, the battery moves toward the patch antenna. There is little to do.

  In another aspect of each embodiment of the present invention, the radio-controlled wristwatch supports the patch antenna and the train wheel, and has a recess, an opening or a notch for receiving the patch antenna, and an attachment reference surface for attaching the train wheel. The receiving surface of the patch antenna is located on the windshield side with respect to the mounting reference surface.

  In this case, most of the metal members constituting the train wheel are located on the back cover side of the receiving surface of the patch antenna, so that the influence caused by the metal member when receiving by the patch antenna is reduced.

  Moreover, in another viewpoint of each embodiment of the present invention, the battery and the patch antenna are arranged at overlapping positions in a cross-sectional view.

  In this way, the radio wristwatch becomes thin.

  1 body, 2 dial, 3 hour hand, 4 minute hand, 5 second hand, 6 crown, 7 button, 8 band fixing part, 9 windshield, 10 back cover, 11 solar cell, 12 ground plate, 13 fixing frame, 14 patch antenna, 15 Train wheel, 16 feeding pin, 17 receiving surface, 18 mounting reference surface, 19 second hand shaft, 20 minute hand shaft, 21 hour wheel, 22 hour wheel presser, 23 coil, 24 circuit board, 25 battery support frame, 26 battery, 27, 28 electrode plate, 29 winding stem, 30 crown operation detection unit, 31 hook, 32 shaft hole, 33 notch, 34 shaft hole, 35 antenna housing unit, 36 train wheel housing unit, 37 crown operation detection unit housing unit, 38 Relief hole, 39 shaft hole, 40 coil accommodating part, 41 winding true hole, 42 hook receiver, 43 boss, 44 positioning pin, 45 notch part, 46 high frequency circuit, 47 control 48, motor hole, 49 ground plate, 50 battery housing part, 51 electrode plate escape part, 52 connection hole, 53 decode circuit, 54 axis, 55 test pattern, 56 motor, 57 switch, 58 solid pattern, 100, 200, 300 radio watch.

Claims (8)

Radio wave watch,
Battery,
A patch antenna that receives radio waves from the satellite,
A high-frequency circuit that generates a baseband signal based on the received radio wave, and a decoding circuit that extracts information from the baseband signal;
A controller that corrects the internal time based on the information about the time included in the information, and in plan view,
The battery and the patch antenna are arranged side by side on an axis passing through the center of the radio-controlled wristwatch,
The high frequency circuit and the decoding circuit are arranged on one side of the shaft,
The controller is a radio wave wristwatch disposed on the other side of the shaft. A circuit board on which the high-frequency circuit, the decoding circuit, and the controller are mounted;
The radio-controlled wristwatch according to claim 1, wherein the high-frequency circuit and the decoding circuit are disposed to face both surfaces of the circuit board.   The radio-controlled wristwatch according to claim 2, wherein the high-frequency circuit is mounted on a back cover side of the circuit board.   The radio-controlled wristwatch according to any one of claims 1 to 3, wherein a coil of a motor for driving the pointer is disposed at a position overlapping the battery in a plan view. It also has a crown,
The radio-controlled wristwatch according to any one of claims 1 to 4, wherein the patch antenna, the battery, and the crown are arranged in this order in a plan view. Furthermore, it has a pair of band fixing parts for fixing the band,
The radio-controlled wristwatch according to any one of claims 1 to 4, wherein the axis is substantially parallel to a straight line connecting the pair of band fixing portions. In addition to supporting the patch antenna and the train wheel, a concave plate, an opening or a notch for receiving the patch antenna, and a ground plane having an attachment reference surface for attaching the train wheel,
The radio wave wristwatch according to any one of claims 1 to 6, wherein a reception surface of the patch antenna is located on a windshield side with respect to the attachment reference surface.   The radio-controlled wristwatch according to any one of claims 1 to 7, wherein the battery and the patch antenna are arranged at an overlapping position in a cross-sectional view.

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