JP2010203782A - Radio wave correction watch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio wave correction watch efficiently arranging a plurality of components in a limited narrow space inside an outer case, while reducing an influence of reception noise on its antenna. <P>SOLUTION: In the radio wave correction watch, a battery 27 and a second motor 24b whose frequency of driving for driving a second hand and a minute hand is the highest are arranged near a winding stem 26, and the antenna 21 is arranged on the opposite side of the winding stem 26 with respect to the center part of the outer case 2. Inside a region surrounded by the second motor 24b, the battery 27, and the antenna 21, and near the periphery of the region, a first to fourth gear trains 25a, 25b, 25c, and 25d, and first, third and fourth motors 24a, 24c, and 24d other than the second motor 24b are arranged. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a radio-controlled timepiece that receives a standard radio wave (standard time information signal) and corrects a display time, and more particularly to a radio-controlled timepiece having a plurality of motors, a train wheel, and the like for driving a plurality of hands.

  2. Description of the Related Art In recent years, a radio-controlled timepiece that receives a standard radio wave and corrects a display time has been known to have, for example, a chronograph function as the radio-controlled timepiece becomes more multifunctional.

  A radio-controlled watch has an antenna that receives radio waves, a time train, a plurality of motors for moving hands, a timing circuit, a radio reception circuit, a battery, etc., which are arranged in an outer case. In the radio wave correction timepiece having, it is necessary to further arrange a chronograph wheel train, a plurality of motors for chronograph hands, and the like. For this reason, especially when a wristwatch-type radio-controlled timepiece has a chronograph function or the like, it is necessary to arrange these plural parts in a limited narrow space in the outer case.

  As an arrangement configuration of each component in a radio-controlled timepiece having a chronograph function or the like, for example, in the invention of Patent Document 1, a second hand motor having a high driving frequency is arranged at the farthest position from an antenna, and radio waves generated by driving the second hand motor The reception performance of the antenna is ensured by reducing the influence of the obstacle.

JP 2007-121076 A

  By the way, in the radio-controlled timepiece having a chronograph function or the like, the positional relationship between the antenna and the second hand motor is important for securing the reception performance of the antenna as in Patent Document 1, but a plurality of other components ( The positional relationship between the time series train wheel, multiple motors for hand movement, timing circuit, radio wave receiving circuit, battery, chronograph series train wheel, multiple motors for chronograph pointers, etc. This is an important issue in order to reduce the influence of reception noise and to efficiently arrange in a limited narrow space in the outer case.

  Accordingly, an object of the present invention is to provide a radio-controlled timepiece that can reduce the influence of reception noise on an antenna and can efficiently arrange a plurality of components in a limited narrow space in an exterior case. .

  In order to achieve the above object, an invention according to claim 1 includes an antenna for receiving a standard radio wave, a plurality of motors for driving a plurality of hands including at least a second hand, and each motor in an exterior case. A radio wave correction comprising: a plurality of train wheels that are driven to move each of the pointers; a battery that serves as a drive source for each motor; and a winding stem that is coupled to a crown protruding outside the outer case. In the timepiece, in the vicinity of the winding stem, at least the second hand driving motor having the highest driving frequency for driving the second hand and the battery are disposed, and the winding stem and the central portion of the outer case Other than the wheel trains and the second hand drive motor, the antenna is disposed on the opposite side, in the region surrounded by the second hand drive motor, the battery, and the antenna, and in the vicinity of the periphery of the region. It is characterized in that another motor is disposed.

  According to a second aspect of the present invention, a standard radio signal received by the antenna is at least amplified and demodulated by analog signal processing, and an output signal from the receiving circuit is input, and each of the above-mentioned signals is input by digital signal processing. And a control circuit that controls the driving of each pointer by driving the motor, and has both ends in the outer case in a direction orthogonal to a straight line passing through the center of the outer case and connecting the winding stem and the antenna. The receiving circuit and the control circuit are respectively disposed on the side.

  The invention according to claim 3 is a function with a low driving frequency for displaying a specific function on a predetermined pointer or a display board among the pointers on the other motors other than the second hand driving motor. A motor is included, and the functional motor is characterized in that driving is stopped during reception when the antenna is receiving a standard radio wave.

  According to a fourth aspect of the present invention, the specific function displayed on the predetermined pointer or the display board by driving the functional motor includes a chronograph, a radio transmission station display, a battery remaining amount display, an alarm time, a date, It is characterized by being at least one of radio wave reception status, water depth measurement display, and altitude measurement display.

  According to a fifth aspect of the present invention, there is provided an electronic sound generating unit that generates an electronic sound, and the electronic sound generating unit is disposed in the vicinity of the receiving circuit.

  The invention according to claim 6 is characterized in that the outer case is made of metal, and a concave notch is formed in an inner facing portion of the outer case close to the control circuit.

  According to the radio-controlled timepiece of the present invention, at least the second hand driving motor for driving the second hand and the battery are disposed in the vicinity of the winding stem, and the winding stem is opposed to the central portion of the outer case. And other motors other than each wheel train and the second hand driving motor are disposed in and near the area surrounded by the second hand driving motor, the battery, and the antenna. Thus, the antenna can be maximally separated from the second hand drive motor having the highest drive frequency and the battery as a large metal part. Thereby, when the antenna receives the standard radio wave, the influence of electromagnetic noise emitted from the second hand drive motor can be minimized, and the influence of the radio wave reception by the battery can be minimized.

The top view which shows the surface side (dial board side) of the radio wave correction timepiece which concerns on embodiment of this invention. The top view which shows the arrangement position of the main components of the radio wave correction timepiece according to the embodiment of the present invention. The top view which showed the regional display board for a date wheel and world time display. The schematic sectional drawing which shows the control circuit vicinity inside an exterior case.

  Hereinafter, the present invention will be described based on the illustrated embodiments. FIG. 1 is a plan view showing the front side (dial plate side) of a radio-controlled timepiece according to an embodiment of the present invention, and FIG. 2 shows the arrangement positions of main components arranged in the exterior case of the radio-controlled timepiece. FIG. The radio-controlled timepiece according to the present embodiment displays the time with hands (hour hand, minute hand, second hand), and also displays the chronograph function and other function information (date, city name, radio wave transmission area, remaining battery level, etc.). It is an example of a wristwatch type having a display function.

  As shown in FIG. 1, the radio-controlled timepiece 1 according to the present embodiment has a dial 3 installed inside a windshield (not shown) provided on the surface side of a metal exterior case 2. At the center of 3, an hour hand 4, a minute hand 5 and a chronograph second hand 6 are coaxially installed. The chronograph second hand 6 is, for example, a 1/5 second chronograph hand.

  On the dial 3, a 24-hour display unit 8 having a 24-hour hand 7 provided at the center of rotation at the "2 o'clock" position, and a second-display unit 10 having a second hand 9 provided at the center of rotation at the "6 o'clock" position. , A chronograph 60-minute display unit 12 having the chronograph minute hand 11 at the center of rotation at the “10 o'clock” position, a date (“28” in FIG. 1) displayed on the date indicator 13 at the “4 o'clock” position, In addition, a display window 15 for displaying a city name ((“NYC (New York City)” in FIG. 1)) displayed on the area display board 14 is provided.

  As shown in FIG. 3, a date wheel 13 and an area display plate 14 for displaying the world time are rotatably installed on the back side of the dial 3, and correspond to the time from the display window 15 of the dial 3. Date and the arbitrarily selected city name are displayed. A plurality of representative city names with different time differences around the world are displayed on the area display board 14 along the circumference. 3, reference numeral 40 denotes a chronograph minute hand spindle to which the chronograph minute hand 11 is attached, reference numeral 41 denotes a 24-hour hand spindle to which the 24-hour hand 7 is attached, and reference numeral 42 denotes a second hand to which the second hand 9 is attached. This is a support shaft.

  As described above, in the radio-controlled timepiece 1 of the present embodiment, the three small hands of the 24-hour hand 7, the second hand 9, and the chronograph minute hand 11 are arranged in a very narrow display area surrounded by the date wheel 13 and the area display board 14. It is necessary to display the pointer by means of inevitably, and the train wheel and the motor are inevitably concentrated in the center. Therefore, it is necessary to devise parts arrangement more than the conventional chronograph timepiece.

  The second display unit 10 has a second scale and a mark 10a ("USA (North America)", "JPN (Japan)", "EUR (Europe) in FIG. 1) corresponding to a standard radio wave (standard time information signal) transmitting station. ) "," CHN (China) "). Further, a remaining amount display unit 16 for instructing the remaining battery level is provided on the outer peripheral side of the chronograph 60 minute display unit 12.

  On the outer surface of the outer case 2 on the “3 o'clock” side, a crown 17 and two operation buttons 18 and 19 are installed. In the radio-controlled timepiece 1, for example, manual time adjustment, city name selection on the display window 15, and alarm time setting are performed by rotating the crown 17, and the chronograph second hand 6, the chronograph minute hand 11, etc. are moved. The chronograph mode to be performed, standard radio wave forced reception operation, battery remaining amount check operation, standard radio wave transmission station display operation, and the like are performed by pressing the operation buttons 18 and 19.

  The second hand 9 is normally operated so as to display 60 seconds by one rotation. However, when the pointer of the transmitting station (mark 10a) of the received standard radio wave is to be displayed, the operation buttons 18 and 19 are pressed. A predetermined mark position of the mark 10a corresponding to the transmitting station received by the operation (for example, if it is in Japan, the second hand 9 rotates to “JPN” and displays an indication.

  The chronograph minute hand 11 is moved so as to display 60 minutes in one rotation in the chronograph mode. However, when it is desired to display the battery remaining amount as a pointer, the remaining amount display portion is displayed by pressing the operation buttons 18 and 19. The chronograph minute hand 11 is rotated to display an indication at 16 remaining amount display positions.

  As shown in FIG. 2, a watch movement 20 is installed between the dial 3 and a back cover (not shown) in the substantially ring-shaped interior of the outer case 2. FIG. 2 shows only main parts constituting the timepiece movement 20, and other parts including these main parts are actually held on a main plate (not shown). 2 shows the position of the main components as viewed from the back side (back cover side) by rotating 180 degrees around the 3 o'clock to 9 o'clock direction of the radio-controlled timepiece 1 shown in FIG. Only the relationship is shown schematically. In FIG. 2, the right side of the outer case 2 is the “3 o'clock” side, the left side of the outer case 2 is the “9 o'clock” side, the upper side of the outer case 2 is the “6 o'clock” side, and the lower side of the outer case 2 is “12 o'clock”. On the side.

  As shown in FIG. 2, the timepiece movement 20 includes an antenna 21, a receiving circuit (hereinafter referred to as “receiving IC”) 22, a control circuit (hereinafter referred to as “control IC”) 23 including a crystal resonator (not shown), The first to fourth motors 24a, 24b, 24c, 24d, the first to fourth wheel trains 25a, 25b, 25c, 25d, and a metal correction member 26 such as kanuki connected to the winding stem 17a of the crown 17 , And a battery 27 as a power source. The battery 27 is a secondary battery capable of storing electric power in the case of the configuration using the power generated by the solar panel, and is a replaceable battery (button type battery or the like) when the power is not solar panel power generation.

  The antenna 21 that receives the standard radio wave (standard time information signal) is disposed near the “9 o'clock” position, and the correction member 26 to which the rotational force of the crown 17 is transmitted is disposed near the “3 o'clock” position. The reception IC 22 is arranged near the “6 o'clock” position, and the control IC 23 is arranged near the “12 o'clock” position. The battery 27 is disposed near the “2 o'clock” position between the correction member 26 and the control IC 23.

  The first motor 24 a is a motor that drives the hour hand 4 and the 24-hour hand 7 via the first wheel train 25 a, and is disposed on the inner side near the middle between the antenna 21 and the receiving IC 22. The second motor 24b is a motor that drives the second hand 9 and the minute hand 5 via the second wheel train 25b, and is disposed near the middle between the receiving IC 22 and the correction member 26 (near the “4 o'clock” position). ing. The third motor 24c is a motor that drives the chronograph second hand 6 via the third wheel train 25c, and is arranged near the middle between the battery 27 and the antenna 21 (near the “11 o'clock” position). . The fourth motor 24d is a motor that drives the chronograph minute hand 11 and the date wheel 13 via the fourth wheel train 25d. The fourth motor 24d is near the middle between the control IC 23 and the antenna 21 (the third motor near the "11 o'clock" position). 24c outside).

  Each of the first to fourth motors 24a, 24b, 24c, and 24d is a step motor. The second motor 24b for driving the second hand 9 and the minute hand 5 is driven by one step every second, and the first motor 24a for driving the hour hand 4 and the 24-hour hand 7 is driven by one step every several minutes, for example. The third motor 24c for driving the chronograph second hand 6 is stopped during normal time display and is driven only in the chronograph mode. The fourth motor 24d that drives the chronograph minute hand 11 and the date indicator 13 is step-driven, for example, every few hours in order to drive the date indicator 13 during normal time display other than when driving in the chronograph mode.

  In FIG. 2, only a part of the plurality of gear trains constituting each of the first to fourth wheel trains 25a, 25b, 25c, and 25d is shown. Actually, the chronograph 24 hour hand 7, the second hand 9. A gear train is arranged up to each pointer shaft of the chronograph minute hand 11. Further, a buzzer generating unit 28 that generates an electronic sound such as an alarm sound is disposed near the outside of the second motor 24b.

  As described above, the antenna 21 near the “9 o'clock” position and the “2 o'clock” to “4 o'clock” positions are centered on the pointer shaft 29 of the hour hand 4, the minute hand 5, and the chronograph second hand 6 that are the center of the outer case 2. Arrange the antenna 21 from the second motor 24b for driving the minute hand 5 and second hand 9 with the highest driving frequency and the battery 27, which is a large metal part, so that the nearby battery 27 and the second motor 24b face each other. I try to keep it as far as possible.

  Thus, the arrangement of the antenna 21 at the 9 o'clock position has many correction members 26 such as kanuki near the 3 o'clock position, and it is difficult to arrange the antenna 21, which is a large metal part, in terms of space. This is because there are many metal parts such as the member 26, the crown 17 and the operation buttons 18 and 19, and these metal parts prevent deterioration in reception performance. By arranging the antenna 21 at the 9 o'clock position, the second motor 24b and the battery 27, which are the next largest components after the antenna 21, are necessarily arranged at the crown 17 on the opposite side of the antenna 21.

  Such an arrangement makes it possible to separate the battery 27, which is a large metal part, and the second motor 24b, which is the highest noise source and has the highest driving frequency, from the antenna 21, and as a result, reception performance can be improved. It becomes. The reason why the second motor 24b for driving the second hand 9 is the largest motor is that the driving frequency is high, and thus a thick coil winding having a low resistance value is used to achieve low power consumption.

  The reception IC 22 is a circuit that performs analog signal processing such as amplification and demodulation on the standard radio wave received by the antenna 21. The control IC 23 is a digital signal processing circuit, and drives the first motor 24a and the second motor 24b for driving the hour hand 4, the minute hand 5, and the second hand 9 at the time of normal time display, for example, based on the internal time signal (reference time signal). This is a circuit that controls various operations such as time adjustment control by comparing control and an output signal (standard time information signal) from the receiving IC 22 with an internal time signal (reference time signal).

  Thus, the receiving IC 22 near the “6 o'clock” position and the control IC 23 near the “12 o'clock” position centering on the pointer shaft 29 of the hour hand 4, the minute hand 5, and the chronograph second hand 6, which are the central axes of the outer case 2. And the receiving IC 22 and the control IC 23 are separated as much as possible.

  As described above, a plurality of parts such as a train wheel and a motor are concentrated on the center side, and the antenna 21 which is the largest part is placed at the “9 o'clock position”, and the second motor 24b and the battery 27 which are the next largest parts are placed. By arranging them at “4 o'clock position” and “2 o'clock position” respectively, the receiving IC 22 and the control IC 23, which are the next largest components, inevitably have vacant “6 o'clock position” and “12 o'clock position”. ".

  By the way, if the receiving IC 22 which is an analog circuit and the control IC 23 which is a digital circuit are arranged close to each other, the operations of the two become noise, which may adversely affect the operation of both ICs and the radio wave reception of the antenna 21. For this reason, in the present embodiment, as described above, the receiving IC 22 and the control IC 23 are arranged at the maximum distance, so that the receiving IC 22 and the control IC 23 operate stably without being affected by noise. In addition, the antenna 21 can stably receive the standard radio wave.

  As shown in FIG. 4, a concave notch 2a is formed in the inner facing portion of the outer case 2 close to the control IC 23 mounted on the substrate 30, and the control IC 23 is made of a metal outer case. 2 away from the opposing inner surface portions.

  In FIG. 4, reference numeral 31 is a windshield, reference numeral 32 is a back cover, reference numeral 33 is a main part (antenna 21, receiving IC 22, control IC 23, first to fourth motors 24a, 24b, 24c, 24d, first to fourth. 4th wheel train 25a, 25b, 25c, 25d, the correction member 26, the battery 27, etc.). In FIG. 4, the date wheel 13 and the area display board 14 shown in FIG. 3 are omitted.

  As described above, the receiving IC 22 and the control IC 23 are located on the outer peripheral side of the watch movement 20 facing each other due to the restrictions on component arrangement, so that the receiving IC 22 and the control IC 23 are located in the vicinity of the inside of the metal outer case 2. Are arranged as follows. For this reason, as a result, external static electricity jumps into the receiving IC 22 and the control IC 23 via the outer case 2, which causes malfunction of the radio-controlled timepiece 1.

  Therefore, in this embodiment, as shown in FIG. 4, the control IC 23 is particularly separated from the facing inner surface portion of the metal outer case 2 by providing a concave notch 2 a inside the outer case 2. I am doing so. As a result, static electricity from the outside is reduced from jumping into the control IC 23 via the outer case 2, and malfunction of the radio-controlled timepiece 1 due to static electricity can be prevented. A concave notch may be similarly formed on the inner surface of the outer case 2 near the receiving IC 22.

  The size of the notch 2a is defined as follows. It is essential that the width A of the notch 2a is equal to or greater than the width B of the control IC 23 (A> B), and that the amount of cutting C in the thickness direction is greater than the thickness t of the control IC 23 (C> t). . This is because, in contrast to the above-described conditions, when A <B or C <t, static electricity easily enters the control IC 23 from the end of the notch 2a.

  In addition, about the amount D of digging of the notch part 2a in the radial direction, it is better to dig deeper, but for the amount, considering the size, material, and processing method of the outer case 2, strength and Set based on processing costs.

  As shown in FIG. 4, the formation of the concave notch 2a in the inner facing portion of the metal outer case 2 close to the control IC 23 is limited to the radio wave correction watch as in this embodiment. It can be applied to the entire electronic timepiece having a metal exterior and an IC. As for the IC, application to not only a control IC such as a CPU but also a random logic IC is effective.

  The radio-controlled timepiece 1 according to the present embodiment is configured as described above. During normal time display operation, the first and second motors 24a and 24b are driven by the control of the control IC 23, and the first and second wheels are driven. The hour hand 4, the 24-hour hand 7, the minute hand 5, and the second hand 9 are moved through the rows 25a and 25b, and the current time is displayed. At this time, when receiving a standard radio wave at a predetermined time or when receiving a standard radio wave by forced reception operation, the standard radio wave received by the antenna 21 is input to the control IC 23 via the receiving IC 22 and the current time is shifted. When it is determined that the time is present, the second motor 24b and the like are driven and corrected to correct the time.

  In the chronograph mode by the pressing operation of the operation buttons 18 and 19, the third and fourth motors 24c and 24d are driven by the control of the control IC 23, and the chronograph second hand 6 is connected via the third and fourth wheel trains 25c and 25d. The chronograph minute hand 11 is moved, and the elapsed time is displayed by each pointer. When the standard radio wave is being received by the antenna 21, the control IC 23 performs control so that the chronograph mode is not performed in order to minimize the influence of electromagnetic noise. Accordingly, the driving of the third and fourth motors 24c and 24d is stopped while the standard radio wave is being received, so that the standard radio wave can be stably received while suppressing the influence of electromagnetic noise.

  When it is desired to indicate and display the transmitting station (mark 10a) of the received standard radio wave with the second hand 9, the predetermined mark position ("" of the transmitting station corresponding to the transmitting station being received by pressing the operation buttons 18 and 19 is displayed. The second hand 9 is rotated and instructed to “JPN” (Japan), “EUR” (Europe), “CHN” (China), or “USA” (North America).

  When it is desired to display the remaining battery level with the chronograph minute hand 11, the chronograph minute hand 11 is rotated to the remaining amount display position of the remaining amount display unit 16 by pressing the operation buttons 18 and 19. It should be noted that no reception is performed during the second hand 9 or chronograph minute hand 11 movement after the operation buttons 18 and 19 are pressed, and a reception operation is started after the completion of the hand movement.

  In the alarm setting mode, the alarm time can be set by, for example, the hour hand 4 by rotating the crown 17 and the alarm can be generated from the buzzer generating unit 28 at the alarm time.

  In addition, when the standard radio wave is being received by the antenna 21, in order to minimize the influence of electromagnetic noise, the control IC 23 displays the indication of the standard radio wave transmitting station (mark 10a) by the second hand 9 and the chronograph. Control is performed so that the indicator display of the remaining battery level by the minute hand 11 and the alarm generating operation by the buzzer generating unit 28 are not performed. As a result, since these functional operations are stopped while receiving the standard radio wave, the standard radio wave is stably received by suppressing the influence of the electromagnetic noise generated by the third and fourth motors 24c and 24d and the buzzer generating unit 28. can do.

  Since the alarm generation operation is not performed by the buzzer generation unit 28 during reception, the buzzer generation unit 28 can be disposed near the reception IC 22 and the restrictions on the component arrangement of the radio-controlled watch with an alarm function are reduced. It becomes possible.

  Further, by stopping the third and fourth motors 24c and 24d having a chronograph function during reception, noise can be prevented and reception performance can be improved, and these functional motors are disposed near the antenna 21 and the reception IC 22. This makes it possible to reduce the restrictions on the component arrangement of the radio-controlled timepiece with functions such as a chronograph. As for the arrangement of the ICs, the positions of the receiving IC 22 and the control IC 23 are exchanged, the receiving IC 22 is arranged at the “12 o'clock” position, and the third and fourth motors 24c and 24d as functional motors are arranged with the receiving IC 22 and the antenna 21. It may be configured to be sandwiched between.

  As for the receiving IC 22, similarly to the antenna 21, when receiving the electromagnetic noise generated by the third and fourth motors 24c and 24d, the receiving performance is degraded. However, the third and fourth motors 24c, 24c, By stopping 24d, the receiving IC 22 can also be arranged in the vicinity of the third and fourth motors 24c, 24d. As a result, it is possible to reduce the restrictions on component placement without lowering the reception performance. Further, since the antenna 21 and the receiving IC 22 are preferably arranged close to each other in terms of receiving performance, a motor (third and fourth motors 24c, 24c, It is more preferable to arrange 24d).

  The function motor is not limited to a chronograph, and any function that is stopped during reception, such as a timer, water depth measurement, or altitude measurement, may be used. Further, the present invention may be applied to a motor with low driving frequency such as a calendar such as a date board, reception sensitivity status, charge amount display, mode display, and world time time display such as UTC time.

  Further, when a predetermined city name (“NYC (New York City)” in FIG. 1) is displayed on the display window 15 by the turning operation of the crown 17, the displayed city name is controlled by the control IC 23. The first motor 24a is driven so as to display the current time, and the hour hand 4 and the 24-hour hand 7 are moved through the first wheel train 25a. In addition, when it corresponds to the correction | amendment of a 30-minute unit by a time difference zone, the 2nd motor 24b is also moved.

  As described above, according to the radio-controlled timepiece 1 according to the present embodiment, the antenna 21 is disposed near the “9 o'clock” position, and the battery 27 and the second motor 24b are disposed near the “2 o'clock” to “4 o'clock” positions. With a configuration in which motors for the chronograph function (third and fourth motors 24c and 24d), wheel trains (third and fourth wheel trains 25c and 25d), etc. are efficiently arranged on the inside and around The antenna 21 is maximally separated from the second hand 9 having the highest driving frequency, the second motor 24b for driving the minute hand 5, and the battery 27 as a large metal part. Thereby, when the antenna 21 receives standard radio waves, the influence of electromagnetic noise emitted from the second motor 24b can be minimized, and the influence of radio wave reception by the battery 27 can be minimized. .

  In addition, a receiving IC 22 that performs analog signal processing is disposed near the “6 o'clock” position, and a control IC 23 that performs digital signal processing is disposed near the “12 o'clock” position, so that the receiving IC 22 and the control IC 23 are separated as much as possible. I am doing so. Thus, the receiving IC 22 and the control IC 23 are efficiently separated so as to be separated as much as possible, and adverse effects such as interference with each other during each signal processing operation can be prevented.

  Further, since the concave notch 2a is formed in the inner facing portion of the outer case 2 close to the control IC 23, the control IC 23 can be separated from the inner portion facing the outer case 2, so that the metal outer case Even when the static electricity accumulated in 2 is discharged, the influence of the discharge noise on the control IC 23 can be minimized.

  The radio-controlled timepiece 1 may further include a function of displaying a pointer with a minute hand 5 or the like, for example, the reception sensitivity status of standard radio waves, water depth measurement, and altitude measurement in addition to the function information described above.

DESCRIPTION OF SYMBOLS 1 Radio wave correction clock 2 Exterior case 2a Recessed notch 3 Dial 4 Hour hand 5 Minute hand 6 Chronograph second hand 7 24 hour hand 9 Second hand 11 Chronograph minute hand 14 Area display board 17 Crown 17a Winding stem 20 Clock movement 21 Antenna 22 Reception IC
23 Control IC
24a 1st motor 24b 2nd motor (motor for second hand drive)
24c, 24d Third and fourth motors (functional motors)
25a, 25b, 25c, 25d 1st-4th each wheel train 26 Correction member 27 Battery 28 Buzzer generating part (electronic sound generating part)

Claims (6)

In the exterior case, an antenna for receiving a standard radio wave, a plurality of motors for driving a plurality of hands including at least a second hand, a plurality of trains driven by the motors and moving the hands, respectively, In a radio-controlled timepiece comprising a battery as a driving source for each motor, and a winding stem connected to a crown protruding outside the outer case,
In the vicinity of the winding stem, at least the second hand driving motor and the battery that are driven at the highest frequency for driving the second hand are disposed, and on the opposite side of the winding stem with respect to the central portion of the outer case. The antenna is arranged,
A motor other than the respective wheel trains and the second hand driving motor is disposed in a region surrounded by the motor for driving the second hand, the battery, and the antenna and in the vicinity of the periphery of the region. Radio correction clock to play. The standard radio signal received by the antenna is amplified and demodulated at least by analog signal processing, and the output signal from the receiving circuit is input, and the motors are driven and controlled by digital signal processing to control the pointers. And a control circuit for controlling the movement of the hand,
The receiving circuit and the control circuit are disposed so as to be positioned at both ends of the outer case in the orthogonal direction with respect to a straight line passing through the center of the outer case and connecting the winding stem and the antenna. The radio-controlled timepiece according to claim 1, wherein   The other motors other than the second hand driving motor include a functional motor with a low driving frequency for displaying a specific function on a predetermined pointer or a display board among the pointers. 3. The radio-controlled timepiece according to claim 1, wherein the motor is stopped during reception while the antenna is receiving standard radio waves.   The specific function displayed on the predetermined pointer or the display board by driving the functional motor includes a chronograph, a radio transmission station display, a battery remaining amount display, an alarm time, a date, a radio wave reception status, a water depth measurement display, an altitude The radio-controlled timepiece according to claim 3, wherein the timepiece is any one or more of measurement displays.   The radio-controlled timepiece according to claim 2, further comprising an electronic sound generating unit that generates an electronic sound, wherein the electronic sound generating unit is disposed in the vicinity of the receiving circuit.   The said exterior case is metal, The concave notch part is formed in the inner side opposing part of the said exterior case adjacent to the said control circuit, The Claim 1 characterized by the above-mentioned. Radio wave correction clock of mention.

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