JP2004354305A - Radio controlled timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio controlled timepiece with a thin nondirectional antenna part. <P>SOLUTION: This radio controlled timepiece comprises a first antenna part 1101 formed of a core antenna 1101a, a second antenna part 1102 differed in directivity from the first antenna part 1101 and formed of a coreless loop antenna 1102a, a control circuit 14 for performing a time correction on the basis of a standard time radio signal received by the first antenna part 1101 and the second antenna part 1102, an internal clock 1401, a pointer driving system for driving a pointer wheel having a plurality of reference positions, and an optical detection sensor 140 as a reference position detecting means for detecting the reference position of the pointer gear. The first antenna part 1101 and the second antenna part 1102 are arranged so that the respective directivities of the first antenna part 1101 and the second antenna part 1102 become nondirectional by composition. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a radio-controlled timepiece that has two antenna parts, for example, a ferrite core antenna and a loop antenna, and corrects the time based on a standard time radio signal received by the antenna part.
[0002]
[Prior art]
For example, a standard radio wave transmission frequency of 40kHz from the standard radio wave transmission station of Mt. Otakaya on the border between Tamura-gun, Fukushima Prefecture and Kawauchi-mura, Futaba-gun. A standard radio wave with a frequency of 60 kHz is transmitted from the station. This standard radio wave includes a standard time code including a time code, a cumulative code, a day code, and a year code.
A radio-controlled timepiece that corrects the time display by the hands based on a standard time code (also referred to as a standard time signal) included in the standard radio wave is known.
[0003]
In conventional radio-controlled timepieces, a ferrite core antenna with a core has been used as an antenna for receiving standard radio waves. This ferrite core antenna has directivity and it is necessary to determine the reception direction of the standard radio wave.
[0004]
In order to eliminate the inconvenience of performing the complicated operation of determining the receiving direction due to this directivity, a radio wave correction watch is known in which two ferrite core antennas are arranged at right angles to each other and an omnidirectional antenna portion is provided. (For example, refer to Patent Document 1)
[0005]
[Patent Document 1]
JP 2001-272482 A (FIG. 3-4)
[0006]
[Problems to be solved by the invention]
However, in the radio wave correction watch described above, since the two ferrite core antennas are arranged at right angles to each other, there is a problem that the thickness of the antenna portion becomes large and it is difficult to reduce the thickness.
[0007]
The present invention has been made in view of such circumstances, and an object of the present invention is to provide a thin radio-controlled timepiece having a non-directional antenna part.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, an aspect of the present invention is a radio-controlled timepiece that corrects time according to a standard time radio signal, and is formed of a first antenna unit formed of a core antenna and a coreless antenna. A second antenna unit having directivity different from that of the first antenna unit, and a control unit that corrects the time based on the standard time radio signal received by the first and second antenna units. The first and second antenna units are arranged such that the directivities of the first and second antenna units are combined to become omnidirectional.
[0009]
According to the viewpoint of this invention, the 1st antenna part is formed with the core antenna. The second antenna unit is formed of a coreless antenna, and the directivity is different from that of the first antenna unit.
The control means corrects the time based on the standard time radio signal received by the first and second antenna units.
The first and second antenna units are arranged such that the directivities of the first and second antenna units are combined to become omnidirectional.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
The radio-controlled timepiece according to the embodiment of the present invention has a core antenna and a coreless antenna, and each of the core antenna and the coreless antenna is arranged so that their directivities are combined to become omnidirectional. Yes.
Hereinafter, it will be described in detail with reference to the drawings.
[0011]
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece according to the present invention. 2 is a front view of the radio wave correction watch shown in FIG. 1, FIG. 3 is a rear view of the radio wave correction watch shown in FIG. 1, FIG. 4 is a block diagram of the radio wave correction watch shown in FIG. It is an enlarged view of the cross section of the radio wave correction watch shown in FIG.
[0012]
As shown in FIGS. 1 to 5, the radio wave correction watch 1 according to this embodiment includes a standard radio wave reception system 11, a time correction switch 12, an oscillation circuit 13, a control circuit 14, a drive circuit 15, a light emitting element 16, and a buffer circuit 17. , A drive circuit 18, a display 30, a timepiece main body 100, a second hand motor 121, an hour / minute hand motor 131, a light detection sensor unit 140, a manual correction system 150, transistors Q1 and Q2, and resistance elements R1 to R4.
The control circuit 14 corresponds to control means according to the present invention.
[0013]
As shown in FIG. 2, a dial 201, a second hand 202 as a pointer, a minute hand 203 and an hour hand 204, and a display 30 are formed on the front surface of the timepiece 1. In addition, a light emitting element 16 as a notification unit is formed below the dial 201. The display 30 displays the time measured according to the internal clock 1401 by the control circuit 14.
[0014]
The standard radio wave reception system 11 receives standard radio waves (also called standard time radio signals) including standard time information (also called time codes) transmitted from a standard radio wave transmission station (not shown), for example, and performs predetermined processing. The pulse signal S11 is output to the control circuit 14.
For example, as shown in FIG. 1, the standard radio wave receiving system 11 includes a plurality of antenna units, for example, a first antenna unit 1101 and a second antenna unit 1102, and a long wave receiving circuit 1103.
[0015]
The first antenna unit 1101 includes, for example, a core antenna 1101a and a matching unit 1101b as shown in FIGS.
The core antenna 1101a is a ferrite core antenna with a core CA 1101a, for example.
The matching unit 1101b is configured by a capacitor (not shown), for example, and is connected to the core antenna 1101a to form a resonance circuit that resonates with the frequency of the carrier wave of the standard time radio signal, and the received standard time radio signal is signal S1101. Is output to the long wave receiving circuit 1103.
[0016]
For example, as shown in FIGS. 1 and 3, the second antenna unit 1102 includes a coreless antenna 1102a and a matching unit 1102b.
The coreless antenna 1102a is, for example, a coreless loop antenna 1102a.
The matching unit 1102b is configured by a capacitor (not shown), for example, and is connected to the loop antenna 1102a to form a resonance circuit that resonates with the frequency of the carrier wave of the standard time radio signal, and the received standard time radio signal is signal S1102. Is output to the long wave receiving circuit 1103.
[0017]
The long wave reception circuit 1103 includes, for example, an RF amplifier, a detection circuit, a rectification circuit, and an integration circuit (not shown), and is input from the signal S1101 input from the first antenna unit 1101 and the second antenna unit 1102. Based on the signal S1102, amplification processing, detection processing, rectification processing, integration processing, and the like are performed, and the processing result is output as a signal S1103.
[0018]
For example, as shown in FIG. 3, the loop antenna 1102 a is formed on the outer periphery of the timepiece 1000. The ferrite core antenna 1101a is formed inside the outer periphery of the watch 1000 where the loop antenna 1102a is formed. Further, for example, the ferrite core antenna 1101 a is formed on the upper part of the watch body 100.
The loop antenna 1102a is formed thinner than the core CA1101a of the ferrite core antenna 1101a.
[0019]
The sensitivity of the core antenna 1101a increases according to the length of the core portion CA1101a in the longitudinal direction.
The loop antenna 1102a has a sensitivity that increases in accordance with the size of the cross-sectional area.
[0020]
FIG. 6 is a diagram for explaining the directivity of the antenna unit of the radio-controlled timepiece shown in FIG.
When the radio-controlled timepiece 1 is viewed from the top, the directivity of the core antenna 1101a is, for example, as shown in FIG. 6, in which the reception gains dir1101A and dir1101B are maximum in the longitudinal direction of the core antenna 1101a and Has the lowest reception gain.
[0021]
As for the directivity of the loop antenna 1102a, for example, as shown in FIG. 6, the reception gains dir1102A and dir1102B are maximum in the longitudinal direction of the loop antenna 1102a, and the reception gain is minimum in the direction perpendicular to the longitudinal direction.
Thus, the directivity of the loop antenna 1102a is different from the directivity of the first antenna unit 1101, and has at least a directivity orthogonal to the directivity of the first antenna unit 1101. Specifically, the loop antenna 1102a includes at least a component in which the direction of the maximum reception gain of the first antenna unit 1101 is orthogonal.
[0022]
In the present embodiment, as shown in FIGS. 3 and 6, the first antenna unit 1101 and the second antenna unit 1102 are arranged so that the directivity is synthesized and becomes omnidirectional.
In addition, as described above, the second antenna unit 1102 is formed of a coreless antenna having directivity orthogonal to at least the directivity of the first antenna unit 1101.
[0023]
Japanese standard radio waves are operated by the Communications Research Laboratory (CRL), a standard radio transmitter that transmits standard radio waves with a frequency of 40 kHz, and standard radio wave transmitters that transmit standard radio waves with a frequency of 60 kHz. A place is provided.
The standard radio wave received by the standard radio wave receiving system 11 is sent in a form as shown in FIG.
[0024]
Specifically, the time code is composed of three types of signal patterns of 1, 0, and P, and is distinguished by a 100% amplitude period width in one signal pattern of 1 sec. 1, 0 and P are 500 ms, 800 ms, and 200 ms, respectively. It has become. The modulation method is amplitude modulation with a maximum value of 100% and a minimum value of 10%.
[0025]
When the reception state is good, the standard radio wave reception system 11 outputs a signal S11 to the control circuit 14 as a pulse signal corresponding to the standard radio wave signal, as shown in FIG. 7B.
[0026]
The signal S11 is composed of, for example, a high level corresponding to the first level and a low level corresponding to the second level. The control circuit 14 performs reception state evaluation processing based on the high level and the low level, the falling edge ed1 from the high level to the low level, and the rising edge ed2 from the low level to the high level. When the edges ed1 and ed2 are not distinguished, they are simply referred to as edges ed.
[0027]
Next, transmission data of the long wave standard radio wave will be described.
FIG. 8 shows an example of the time code of the standard time radio signal. FIG. 8A shows a format other than 15/45 minutes, and FIG. 8B shows a format of 15 minutes and 45 minutes.
The transmission information is the accumulated date from minutes, hours, and January 1st.
The time data is transmitted at 1 bit / sec. One frame is one frame, and information on the accumulated date from the above-mentioned minute / hour / January 1 is provided as a BCD code in this frame. In addition to the 0 · 1, the transmitted data includes a marker called P code. This P code has several locations in one frame, and the minute (0 seconds), 9 seconds, 19 seconds, 29 seconds, Appears at 39, 49, 59 seconds. This P code appears continuously only once at 59 seconds and 0 seconds in one frame, and the position where this P code appears continuously becomes the minute position. In other words, since time data such as minute / hour data is determined in the frame with reference to this minute position, time data cannot be extracted unless this minute position is detected.
[0028]
The time adjustment switch 12 is operated, for example, when adjusting the time, and outputs a signal S12 to the control circuit 14 in accordance with the operation. When the signal S12 is input from the time adjustment switch 12, the control circuit 14 corrects the time.
[0029]
The oscillation circuit 13 includes a crystal oscillator CRY and capacitors C2 and C3, and supplies a basic clock having a predetermined frequency to the control circuit 14.
[0030]
The control circuit 14 has an internal clock 1401 and a memory 1402.
The internal clock 1401 includes, for example, an hour counter, a minute counter, and a second counter.
[0031]
The memory 1402 is used as a work space of the control circuit 14, for example. For example, the memory 1402 includes a RAM (Random access memory) or the like.
[0032]
For example, when the time adjustment switch 12 is operated in the initial state, the control circuit 14 performs the origin detection processing of the pointer wheel and outputs the drive signals CTL1 and CTL2 corresponding to the time information measured by the internal clock 1401. Then, the time is displayed using the hands.
The control circuit 14 performs the phase detection process of the hour / minute hand wheel and the second hand wheel, the origin search process of the second hand, the origin search process of the hour / minute hand, and detects the position of each hand wheel after a predetermined time. Set a guideline.
[0033]
For example, the phase adjustment processing is performed by setting the hour / minute hands to a position where the light output from the light emitting element 142 passes through the light transmitting portion provided in the hour / minute hand wheel and the light transmitting portion provided in the second hand wheel. Drive the car and the second hand wheel.
In the second hand origin search process, the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the second hand wheel, and the origin is searched based on the light on / off pattern. The
As will be described later, the hour / minute hand origin search process is a light on / off pattern in which the light output from the light emitting element 142 is received by the light receiving element 144 by the light shielding portion and the light transmitting portion provided in the hour / minute hand wheel. The position is searched based on.
[0034]
The control circuit 14 samples a standard time radio signal (for example, 32 Hz) for a predetermined time, for example, 8 seconds in this embodiment, and determines the reception state based on the sampling result.
[0035]
Specifically, the control circuit 14 performs sampling (for example, 32 Hz) of the signal S11 input from the standard radio wave reception system 11, for example, detects the edge ed, and determines the reception state based on the presence or absence and the number of the edge ed. To do.
[0036]
The control circuit 14 counts various counters of the internal clock 1401 based on the basic clock by the oscillation circuit 13 when the time can be set based on the standard radio time signal received at the set reception frequency. Take control.
[0037]
In addition, the control circuit 14 is configured such that, for example, when one of the first antenna unit 1101 and the second antenna unit 1102 has a poor reception state, the antenna unit with the better reception state, more specifically, the first antenna unit The time is corrected based on the standard time radio signal received by 1101 or the second antenna unit 1102.
[0038]
When the reception state is not within the reference range, the control circuit 14 outputs the drive signal DR1 to the drive circuit 15 without outputting the control signal CTL1, and causes the light emitting element 16 as the notification means to emit light to the user. Notify that the standard radio wave signal is hardly received.
[0039]
When the control circuit 14 compares the time measured by various time counters of the internal clock 1401 with the standard time information based on the standard time radio signal received by the standard radio signal receiving system 11, an error has occurred. In this case, the time counter is corrected according to the error, the pulse signal P for correction is input to the motor 131 as the control signal CTL2 according to the correction, and fast-forward driving is performed to correct the time display by the pointer. I do.
[0040]
Next, a specific configuration of the movement of the radio-controlled timepiece and the pointer position detection system will be described with reference to FIGS. 4 and 5 and FIGS.
As shown in FIGS. 4 and 5, the watch body 100 has a lower case 111, an upper case 112 that are connected to face each other to form an outline, and a space formed by the lower case 111 and the upper case 112. An intermediate plate 113 is provided in a state of being connected to the case 111.
[0041]
The watch body 100 includes a lower case 111 as a second case and an upper case 112 as a first case that are connected to face each other to form an outline, and a space formed by the lower case 111 and the upper case 112. A middle plate 113 arranged in a state of being connected to the lower case 111 at a substantially central portion, and a first drive system with respect to predetermined positions of the lower case 111, the middle plate 113, and the upper case 112 in the space. A (second hand drive system) 120, a second drive system (hour / minute hand drive system) 130, a light detection sensor 140, a manual correction system 150, and the like are fixed or pivotally supported.
[0042]
The second hand drive system 120 and the hour / minute hand drive system 130 correspond to time display means according to the present invention.
[0043]
As shown in FIG. 4, the first drive system 120 includes a substantially U-shaped stator 121a, a drive coil 121b wound around one leg piece of the stator 121a, and a rotation between the other magnetic pole of the stator 121a. First stepping motor 121 configured by a freely arranged rotor 121c and a first fifth transmission gear (first detection gear) in which a large-diameter gear 122a meshes with a pinion 121d of the rotor 121c. A wheel 122 and a second hand wheel 123 as a second detection gear (first pointer wheel) meshed with the small gear 122b of the first fifth wheel 122 are configured.
Here, in the second hand stepping motor 121, the stator 121a is mounted and fixed on the intermediate plate 113, and the rotor 121c is pivotally supported by the intermediate plate 113 and the upper case 112. The output control signal CTL1 of the control circuit 14 is provided. The rotation direction, rotation angle, and rotation speed are controlled based on the above.
[0044]
The first fifth wheel 122 has 60 teeth on the large gear 122a and 15 teeth on the small gear 122b, and is rotatably supported by the intermediate plate 113 and the upper case 112. The large-diameter gear 122a meshes with the rotor 121c (pinion 121d) of the second hand stepping motor 121 to reduce the rotational speed of the rotor 121c to a predetermined speed. As shown in FIG. 9, the first fifth wheel & pinion 122 includes three circular transparent holes arranged at equal intervals in the circumferential direction (center angle α1 is 120 °) in a region overlapping the second hand wheel 123. A hole 122c is formed. The through-hole 122c not only allows the detection light of the light detection sensor 140 to pass, but at least one of them is used as a positioning hole (determining hole) when assembling the first fifth wheel & pinion 122. is there.
[0045]
In the second hand wheel 123, the large-diameter gear 123a has 60 teeth, one end of the shaft portion is pivotally supported by the upper case 112, and the second hand passes through the middle plate 113 to the lower case 111 side. A shaft 123b is press-fitted, and this second hand shaft 123b is inserted inside a minute hand pipe 134p described later, and a second hand is attached to the tip thereof. As shown in FIG. 12, the second hand wheel 123 has eleven circular shapes arranged at equal intervals in the circumferential direction (center angle α2 is 30 °) in the region overlapping the first fifth wheel & pinion 122 by rotation. A through-hole 123c is formed, and a positioning light-shielding portion 123d having a different pitch only at one place (the central angle between the through-hole 123c and the through-hole 123c is 60 °). The second hand is configured to indicate the hour when the through hole 122c of the first fifth wheel & pinion 122 first faces the through hole 123c after facing the positioning light-shielding portion 123d.
[0046]
The through-hole 123c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the second hand wheel 123 is assembled.
Further, inside these through-holes 123c, arc-shaped biasing springs 123e that are long in the circumferential direction and project in the direction of the rotation axis are defined by the cutout holes 123f. The arcuate urging spring 123e urges the second hand wheel 123 in the rotation axis direction.
[0047]
Here, the positioning light-shielding portion 123d is formed at a position away from the notch hole 123f in the circumferential direction, that is, at a region where the two notch holes 123f are separated from each other. Accordingly, a sufficient distance between the cutout hole 123f and the positioning light-shielding portion 123d can be secured, so that the detection light does not circulate into the cutout hole 123f in the region of the positioning light-shielding portion 123d, and the positioning light-shielding portion 123d reliably Detection light can be blocked. That is, since the positioning light-shielding portion 123d is formed at a position away from the region where the notch hole 123f is prone to erroneous detection due to detection light wraparound, the positioning light-shielding portion 123d is moved to the rotational angle position of the second hand wheel 122. By using this for positioning, reliable positioning can be performed.
[0048]
In the second hand wheel 123, as shown in FIG. 11, instead of providing a plurality (11) of through holes 123c, as shown in FIG. 12, a through hole 123c at a position facing the positioning light-shielding portion 123d in the radial direction. Other through-holes 123c may be formed integrally with the cut-out holes 123g, respectively. According to this, it is possible to further ensure the passage of the detection light in the portion where the detection light is allowed to pass, and to reduce the waste of the material forming the second hand wheel 123.
[0049]
As shown in FIGS. 4, 5, and 10, the second drive system 130 includes a substantially U-shaped stator 131a, a drive coil 131b wound around one leg piece of the stator 131a, and the stator 131a. A second fifth wheel & pinion 132 as an intermediate gear in which a large-diameter gear 132a meshes with a pinion 131d of the rotor 131c and an hour / minute hand stepping motor 131 constituted by a rotor 131c rotatably arranged between the other magnetic poles. The third wheel 133 as a second transmission gear (third detection gear) in which the large gear 133a meshes with the small gear 132b of the second fifth wheel 132, and the small gear 133b of the third wheel 133 The minute hand wheel 134 as a fourth detection gear (second pointer wheel) meshed with the large diameter gear 134 a and the small diameter gear 134 b of the minute hand wheel 134 are engaged with the large diameter gear 135 a. It was a minute wheel 135 of the day as the intermediate gear is constituted by the hour wheel 136 of the fifth detection gear in mesh with the small diameter gear 135b of the minute wheel 135 of the day (second hand wheel).
Here, in the hour / minute hand stepping motor 131, the stator 131 a is mounted and fixed on the intermediate plate 113, and the rotor 131 c is pivotally supported by the intermediate plate 113 and the upper case 112. The rotation direction, rotation angle, and rotation speed are controlled based on the above.
[0050]
The second fifth wheel & pinion 132 is formed such that the number of teeth of the large diameter gear 132a is 60 and the number of teeth of the small diameter gear 132b is 15, and is pivotally supported by the intermediate plate 113 and the upper case 112, and the large diameter gear 132a. Meshes with the rotor 131c (pinion 131d) of the hour / minute hand stepping motor 131 to reduce the rotational speed of the rotor 131c to a predetermined speed. As the second fifth wheel & pinion 132, the above-mentioned first fifth wheel & pinion 122 may be used, that is, the one provided with the through hole 122c may be used. Thereby, parts can be shared and the cost of the product can be reduced.
[0051]
In the third wheel 133, the large-diameter gear 133a has 60 teeth and the small-diameter gear 133b has ten teeth. One end of the shaft portion is pivotally supported by the upper case 112, and the other end side is the middle plate 113. It is rotatably arranged in a penetrating state, and the rotation of the second fifth wheel & pinion 132 is decelerated and transmitted to the minute hand wheel 134. In addition, as shown in FIG. 14, the third wheel & pinion 133 is arranged at equal intervals (center angle α3 is 36 °) in the circumferential direction in a region overlapping with the second hand wheel 123 and the first fifth wheel 122 by rotation. Ten circular through holes 133c are formed. The through-hole 133c not only allows the detection light of the light detection sensor 140 to pass through, but at least one of them is used as a positioning hole (determining hole) when the third wheel 133 is assembled.
[0052]
In the minute hand wheel 134, the large-diameter gear 134a has 60 teeth and the small-diameter gear 134b has 14 teeth, and the minute hand pipe 134p, in which the small-diameter gear 134b is integrally formed, is formed at the side surface. It is formed so as to have a substantially T-shape when viewed. One end portion of the minute hand pipe 134p is pivotally supported by the intermediate plate 113, and the other end side shaft portion is rotatably inserted into an hour hand pipe 136p of an hour hand wheel 136 described later. Further, the minute hand pipe 134p penetrates the lower case 111 and protrudes toward the dial face of the timepiece, and a minute hand is attached to the tip thereof.
[0053]
Further, as shown in FIG. 15, the minute hand wheel 134 has three arc-shaped through holes that are long in the circumferential direction in a region overlapping with the second hand wheel 123, the first fifth wheel 122, and the third wheel 133 by rotation. 134c, 134d, and 134e are formed. The arc-shaped through-hole 134c and the arc-shaped through-hole 134d are formed with a center angle α5 separated by 30 °, and the arc-shaped through-hole 134d and the arc-shaped through-hole 134e are formed with a center angle α6 separated by 30 °. Further, the arc-shaped through hole 134e and the arc-shaped through hole 134c are formed at a central angle α7 and separated by 60 °. That is, the light-shielding portion A having the widest width is formed between the arc-shaped through hole 134e and the arc-shaped through hole 134c, and between the arc-shaped through hole 134c and the arc-shaped through hole 134d and between the arc-shaped through hole 134d and A light shielding part B narrower than the light shielding part A is formed between the arcuate through hole 134e.
[0054]
The arc-shaped through-hole 134c is formed by a circular portion 134c1 on one end side, a wide arc portion 134c2 extending from the other end side, and a narrow arc portion 134c3 connecting the two. The circular portion 134c1 defined by the narrow circular arc portion 134c3 is used not only for passing the detection light but also as a positioning hole (determining hole) when the minute hand wheel 134 is assembled.
[0055]
The hour hand wheel 136 has a large gear 136a having 40 teeth, and a cylindrical hour hand pipe 136p is integrally attached to the center of the hour hand wheel 136a. The minute hand pipe 134p is disposed inside the hour hand pipe 136p. It is inserted. The hour hand pipe 136p is inserted into a bearing hole 111a formed in the lower case 111 and pivotally supported. The tip of the hour hand pipe 136p penetrates the lower case 111 to the dial face of the watch. It protrudes and has an hour hand attached to its tip.
[0056]
In addition, as shown in FIG. 16, the hour hand wheel 136 includes three pieces which are long in the circumferential direction in a region overlapping with the second hand wheel 123, the first fifth wheel 122, the third wheel 133, and the minute hand wheel 134 by rotation. Arc-shaped through holes 136c, 136d, and 136e are formed. The arc-shaped through-hole 136c and the arc-shaped through-hole 136d are formed with a central angle α8 of 45 ° apart, and the arc-shaped through-hole 136d and the arc-shaped through-hole 136e are formed with a central angle α9 of 60 ° apart. Further, the arc-shaped through hole 136e and the arc-shaped through hole 136c are formed at a central angle α10 and separated by 30 °, and the arc-shaped through holes 136c, 136d, and 136e have a length of the central angle β1 + β2, β3 and β4 are set to be 75 °, 60 °, and 90 °, respectively. That is, the narrowest light-shielding portion C is formed between the arc-shaped through-hole 136e and the arc-shaped through-hole 136c, and the light-shielding portion C is located between the arc-shaped through-hole 136c and the arc-shaped through-hole 136d. A wide light-shielding portion D is formed, and a light-shielding portion E wider than the light-shielding portion D is formed between the arc-shaped through hole 136d and the arc-shaped through-hole 136e.
[0057]
In addition, the arc-shaped through hole 136c connects the circular portion 136c1 located at a center angle β1 of 7.5 ° from one end side and the wide arc portion 136c2 extending from the other end side, and connects the both. It is formed by a narrow arc portion 136c3 located on both sides. The circular portion 136c1 defined by the narrow arc portion 136c3 is used not only for passing detection light but also as a positioning hole (determining hole) when the hour hand wheel 136 is assembled.
[0058]
The minute wheel 135 has 42 teeth for the large-diameter gear 135a and 10 teeth for the small-diameter gear 135b, and is pivotally supported with respect to the protrusion 111b formed on the lower case 111. The large-diameter gear 135a meshes with the small-diameter gear 134b formed on the minute hand pipe 134p, and the small-diameter gear 135b meshes with the hour hand wheel 136 (136a) to decelerate the rotation of the minute hand wheel 134 and to set the hour hand It is transmitted to the car 136.
[0059]
As shown in FIG. 5, the light detection sensor 140 includes a light emitting element 142 made of a light emitting diode attached to a circuit board 141 fixed to the wall surface of the upper case 112, and a lower case so as to face the light emitting element 142. And a light receiving element 144 made of a phototransistor attached to a circuit board 143 fixed to the wall surface of 111.
The anode of the light emitting element 142 is connected to the other end of the resistance element R4 in the drive circuit 18 having one end connected to the collector of the pnp transistor Q2, and the cathode is grounded and connected to the emitter of the light receiving element 144. Yes.
The collector of the light receiving element 144 is connected to the control circuit 14. The connection line with the control circuit 14 is an output line to the control circuit 14 for the detection signal DT1.
The emitter of the transistor Q2 of the drive circuit 18 is connected to the supply line of the power supply voltage _Vcc , and the base is connected to the output line of the drive signal DR2 via the resistance element R3.
That is, the light emitting element 142 is connected to the drive circuit 18 so as to emit light when the low level drive signal DR2 is output from the control circuit 14.
[0060]
Further, as shown in FIG. 5, the first fifth wheel 122, the second hand wheel 123, the third wheel 133, the minute hand wheel 134, and the hour hand wheel 136 are all disposed at the same time in a plan view. And the through-hole 122c of the 1st fifth wheel 122, the through-hole 133c of the third wheel 133, the through-hole 123c of the second hand wheel 123, the through-hole 134c (134d, 134e) of the minute hand wheel 134, and the through-hole of the hour hand wheel 136 When 136c (136d, 136e) overlaps, the detection light emitted from the light emitting element 142 is received by the light receiving element 144, and it is output that the second hand, the minute hand, and the hour hand indicate the position such as the hour. It has become.
[0061]
Further, the light emitting element 142 is disposed in an attachment recess 112c as a first arrangement portion formed so as to open to the outside of the upper case 112, and a circular through hole having a predetermined diameter is formed on the bottom surface of the attachment recess 112c. A hole 112d is formed. The circular through-hole 112d has a property that the detection light emitted from the light emitting element 142 spreads in a divergent shape, and therefore, it is possible to prevent erroneous detection by blocking only the light that has converged by blocking the light of the spread. It is to make.
Similarly, the light receiving element 144 is disposed in an attachment recess 111c as a second arrangement portion formed so as to open to the outside of the lower case 111, and a circular shape having a predetermined diameter is formed on the bottom surface of the attachment recess 111c. A through hole 111d is opened. The circular through-hole 111d emits from the light-emitting element 142 and allows only light that has passed through the through-hole to pass as much as possible to prevent erroneous detection.
[0062]
When attaching the first fifth wheel 122, the third wheel 133, the second hand wheel 123, the minute hand wheel 134, and the hour hand wheel 136, a predetermined positioning pin is used as the circular through hole 111d of the lower case 111, and the positioning. The assembly is sequentially performed so as to penetrate the through hole and the circular through hole 112d of the upper case 112. After the upper case 112 and the lower case 111 are joined and integrated, the positioning pin is pulled out, the light emitting element 142 is attached to the attachment recess 112c where the through hole 112d is located, and the attachment recess where the through hole 111d is located The light receiving element 144 is attached to 112c.
[0063]
As a result, the through holes 112d and 111d are completely closed, and external light can be prevented from entering the internal space defined by the upper case 112 and the lower case 111. Therefore, it is possible to prevent erroneous detection due to the intrusion of external light, and since both the positioning hole at the time of assembly and the light detection through-hole are combined, compared to the case where these holes are provided separately. Centralization and downsizing of the device can be performed.
[0064]
As shown in FIGS. 4 and 5, the manual correction system 150 includes a minute wheel 135 that meshes with the small-diameter gear 134 b of the minute hand wheel 134 and the large-diameter gear 136 a of the hour hand wheel 136, and the minute wheel 135 of this day. And a manual correction shaft 151 having a gear 151a meshing with the large-diameter gear 135a. The manual correction shaft 151 is positioned outside the upper case 112 and penetrates a head 151b that can be directly touched by a user and an opening 112e that extends from the head 151b and is formed in the upper case 112. It consists of a columnar portion 151c that is pivotally supported with respect to a protrusion 111e formed on the lower case 111, and a gear 151a is formed in a lower region of the columnar portion 151c.
[0065]
The manual correction shaft 151 is configured to rotate in the same phase as the minute hand wheel 134, and when the minute hand wheel 134 is driven by the above-described second drive system 130, the minute hand wheel 134 via the minute wheel 135. When the second drive system 130 is not operated, the pointer position can be manually corrected by rotating the head 151b with a finger.
[0066]
As described above, the second hand shaft 123b of the second hand wheel 123 is inserted into the minute hand pipe 134p of the minute hand wheel 134, and the minute hand pipe 134p of the minute hand wheel 134 is inserted into the hour hand pipe 136p of the hour hand wheel 136. The minute hand wheel 134 and the hour hand wheel 136 have the same rotation center axis, and when the time is displayed, the second hand is rotated once every 60 seconds, the minute hand is rotated once every 60 minutes, and the hour hand is rotated. Driven to rotate once every 12 hours.
[0067]
As shown in FIG. 17, a groove serving as a first index for positioning extending at a predetermined width in the radial direction is provided at the tip of the minute hand pipe 134p of the minute hand wheel 134 and the tip of the hour hand pipe 136p of the hour hand wheel 136. 134 g and a groove 136 g as a second index are formed. The groove 134g and the groove 136g are set so as to indicate a predetermined time, for example, 12:00 when aligned.
[0068]
By providing such a positioning index, even if the minute hand wheel 134 and the hour hand wheel 136 are surrounded by the lower case 111 and the upper case 112 and covered, the grooves 134g and 136g can be preliminarily aligned. Since it can be seen that it indicates the approximate time that has been set, the minute hand and hour hand can be easily attached based on that state, eliminating the need for other alignment and position confirmation processes. Manufacturing time and inspection time can be shortened. Note that the positioning index is not limited to the above groove, but may be a mark such as a potch.
[0069]
FIG. 18 is a flowchart showing the operation of the hand position detection process of the radio-controlled timepiece shown in FIG.
The control circuit 14 drives the pointer driving system to detect the reference position of the pointer wheel based on the detection processing of the reference position detection unit, and then receives the standard time received by the first antenna unit 1101 and the second antenna unit 1102. The time measured by the internal clock 1401 is corrected based on the radio signal, and the pointer position of the pointer wheel is set based on the time measured by the internal clock 1401.
The pointer position detection process will be described with reference to FIG.
[0070]
An hour / minute pulse signal output pattern is set from the control circuit 14 (ST101), and the drive signal DR2 is output to the drive circuit 18 at a low level. Accordingly, the transistor Q2 is turned on, and detection light is emitted from the light emitting element 142, that is, the light emitting diode.
[0071]
Subsequently, the control signal CTL1 is output from the control circuit 14, the second stepping motor 121 is pulse-driven (ST102), the light receiving element 144, that is, the phototransistor is turned on, and the detection signal DT1 is at a high level (power supply voltage _Vcc level). It is determined whether or not the signal has been switched from low to low (ST103).
[0072]
Here, when the detection signal DT1 from the phototransistor is held at a high level, the detection signal DT1 from the phototransistor is at a high level (power supply every time the number of pulses is added to perform step driving. It is determined whether or not the voltage _Vcc level has been switched to a low level (ST104 to ST106).
If the detection signal DT1 output from the phototransistor does not switch from the high level (power supply voltage _Vcc level) to the low level even when the number of pulses reaches 9, the hour / minute hand stepping motor 131 performs one step (pulse). Then, the second hand stepping motor 121 is step-driven again (ST102), and the second hand wheel 123 is rotationally driven.
[0073]
On the other hand, when it is determined in step ST103 that the detection signal DT1 from the phototransistor has switched from the high level to the low level, the second hand wheel 123 is fast-forwarded (ST108), and the comparison with the output pattern stored in advance in the control circuit 14 is performed. Performed (ST109).
As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST108, and the second hand wheel 123 is fast-forwarded again.
[0074]
On the other hand, if the obtained output pattern matches the stored output pattern, the output of the phototransistor is then output at that time (when the level of the detection signal DT1 is not switched to the low level by the phototransistor even at the fifth step). At the time of switching to low level), the output of the control signal CTL1 is stopped, and the circuit driving of the second hand wheel 123 is stopped. Then, the second hand wheel 123 stops at the zero return position (ST110). At this time, the second hand is corrected to a position at a predetermined time, for example, the hour (0 second), and the second hand origin searching process ends.
[0075]
Subsequently, the control signal CTL2 is output from the control circuit 14, only the hour / minute hand stepping motor 131 is pulse-driven at a predetermined output frequency, and the minute hand wheel 134 is fast-forwarded (ST111).
[0076]
Then, the output pattern from the phototransistor is compared with the output pattern stored in advance in the control circuit 14 (ST112).
As a result of the comparison, if the obtained output pattern does not match the stored output pattern, the process returns to step ST111, and the minute hand wheel 134 is fast-forwarded again.
[0077]
On the other hand, if the obtained output pattern matches the stored output pattern as a result of the comparison in step ST112, the output of the control signal CTL2 is stopped at that time, and the hour / minute hand stepping motor 131 is stopped. Then, the driving of the minute hand wheel 134 and the hour hand wheel 136 is stopped (ST113).
[0078]
Here, the position detection processing of the hour / minute hand wheel by comparing the output pattern with the output pattern stored in advance is performed by matching with any of the three types of patterns.
[0079]
FIG. 19 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG.
That is, as shown in FIG. 19A, the output pattern of the phototransistor by the minute hand wheel 134 has two narrow B portions and one wide A portion alternately as the off-width where the light shielding portion acts. As shown in FIG. 19B, the output pattern of the phototransistor by the hour hand wheel 136 has three different widths D portion, E portion, and C portion where the light shielding portion acts. Is a pattern that appears alternately at a predetermined interval. As shown in FIG. 19C, an output pattern obtained by combining the two is a pattern in which the D portion, the B portion, and the A portion are combined, and the E portion, Three types of patterns, which are a combination of the B part and the A part and a pattern of the C part, the B part, and the A part, appear at predetermined intervals.
In the pattern shown in FIG. 19, the part of the pattern that is turned on is actually a part that is turned off by the light shielding part of the third wheel & pinion 133, and is a tooth-missing pattern.
[0080]
Further, for example, as reference positions of the minute hand wheel 134 and the hour hand wheel 136, as shown in FIG. 19, positions of 0:00, 4:00, and 8:00 are set.
[0081]
When a pattern consisting of a combination of D part, B part and A part is confirmed, for example, 4:00, for example, when a pattern consisting of a combination of E part, B part and A part is confirmed, for example, 8:00, If a pattern consisting of a combination of part C, part B and part A is confirmed, for example, it is set in advance as 12:00, for example, when one of these patterns is detected, an hour / minute hand stepping motor By stopping 131, the minute hand wheel 134 and hour hand wheel 136, that is, the minute hand and hour hand can be adjusted to a predetermined time.
[0082]
Then, after the hour / minute hand stepping motor 131 is stopped, the drive signal DR2 by the control circuit 14 is switched to a high level.
Thereby, the transistor Q2 of the drive circuit 18 is turned off, the light emission of the light emitting diode is stopped (ST114), and the time adjustment operation is ended.
[0083]
Further, a case where the shipping position TS is set such that the origin search process of the hour / minute hands wheel is shortened in the sword attachment mode, that is, 10:30 in this embodiment, will be described with reference to FIG.
For example, when the user turns on the external power supply 201, the control circuit 14 performs phase alignment processing, second hand origin search processing, minute hand origin search processing, and time adjustment processing. When the shipping position TS is set to 10:30, as shown in FIG. 19, the second hand wheel and the hour / minute hand wheel are driven from the shipping position TS to penetrate the detection light, and then the hour / minute hand is stopped and the second hand origin point is set. Perform a search. After that, by rotating the hour and minute hands wheel, by detecting the C part with the optical sensor part 140, it is detected that the position is approximately 12 o'clock, and by stopping when the B part and the A part are detected, The minute hand is set at a predetermined reference position 12:00.
[0084]
For example, the 10:30 position is a position where a necessary and necessary on / off pattern to be referred to is detected when the origin search process is performed when the hour / minute hand wheel is set to the reference position. By setting a shipping guideline at this position, the origin search time is the shortest.
[0085]
As described above, the first antenna unit 1101 formed of a core antenna, the antenna unit 1102 formed of a coreless antenna and having directivity different from that of the first antenna unit 1101, and the first antenna unit 1101 And a control circuit 14 that corrects the time based on the standard time radio wave signal received by the second antenna unit 1102, an internal clock 1401, a pointer drive system that drives a pointer wheel provided with a plurality of reference positions, and a pointer And a light detection sensor 140 as a reference position detecting means for detecting a reference position of the vehicle. The first antenna unit 1101 and the second antenna unit 1102 are respectively a first antenna unit 1101 and a second antenna unit 1102. Because it is arranged so that the directivity of synthesizes becomes omnidirectional, it is possible to provide a thin radio correction watch that is omnidirectional That.
[0086]
Compared to a radio wave correction watch in which conventional core antennas are arranged at right angles to each other, the second antenna unit 1101 is formed of a coreless loop antenna 1101a, and the core unit CA1101a of the core antenna 1101a of the first antenna unit 1101 is formed. Since it is formed thinner than the thickness, it is easy to reduce the thickness.
[0087]
Since the second antenna unit 1102 is formed on the outer periphery of the watch, the cross-sectional area of the coil of the loop antenna 1102a is large, and a sufficient reception gain can be obtained when a standard time radio signal is received.
Further, the first antenna portion 1101 can be reduced in size because it is formed inside the outer peripheral portion of the watch on which the second antenna portion 1102 is formed.
[0088]
In addition, when one of the first antenna unit 1101 and the second antenna unit 1102 has a poor reception state, the time is based on the standard time radio signal received by the antenna unit with the better reception state. Since the correction is performed, it is possible to prevent an adverse effect from the antenna unit having a poor reception state, for example, an influence due to a noise component or the like, and it is possible to perform time correction with high accuracy based on a standard time radio signal having a small noise component.
[0089]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the present embodiment, the shape of the loop antenna 1102a of the second antenna unit 1102 is circular, but is not limited to this form. For example, the shape of the loop antenna 1102a may be a predetermined shape as long as a reception gain sufficient to normally receive the standard time radio signal is obtained.
[0090]
【The invention's effect】
According to the present invention, it is possible to provide a thin radio-controlled timepiece having an antenna portion that is non-directional and thin.
[Brief description of the drawings]
FIG. 1 is an electrical functional block diagram of an embodiment of a radio-controlled timepiece according to the present invention.
2 is a front view of the radio-controlled timepiece shown in FIG. 1. FIG.
FIG. 3 is a rear view of the radio wave correction watch shown in FIG. 1;
4 is a block diagram of the radio-controlled timepiece shown in FIG. 1. FIG.
FIG. 5 is an enlarged view of a cross section of the radio wave correction watch shown in FIG. 4;
6 is a diagram for explaining the directivity of the antenna unit of the radio-controlled timepiece shown in FIG. 1. FIG.
FIG. 7 is a diagram for explaining a radio wave reception state in the control circuit according to the present invention.
FIG. 8 shows an example of a time code of a standard time radio signal. (A) shows formats other than 15 and 45 minutes per hour, and (b) shows formats for 15 minutes and 45 minutes per hour.
FIG. 9 is a plan view showing a first drive system that drives a second hand that is a part of the radio-controlled timepiece.
FIG. 10 is a plan view showing a second drive system that drives the minute hand and hour hand that are part of the radio-controlled timepiece.
FIG. 11 is a plan view showing a first fifth wheel & pinion that forms part of a first drive system that drives a second hand.
FIG. 12 is a plan view showing a second hand wheel that forms part of the first drive system that drives the second hand.
FIG. 13 is a plan view showing another example of a second hand wheel that forms part of the first drive system that drives the second hand.
FIG. 14 is a plan view showing a third wheel & pinion that forms part of a second drive system that drives the minute hand and hour hand.
FIG. 15 is a plan view showing a minute hand wheel that forms part of a second drive system that drives the minute hand and the hour hand.
FIG. 16 is a plan view showing an hour hand wheel forming a part of a second drive system for driving the minute hand and the hour hand.
FIG. 17 is an end view showing the tip portions of the minute hand pipe and the hour hand pipe.
18 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG.
FIG. 19 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Radio wave correction clock, 11 ... Standard radio wave reception system, 12 ... Time correction switch, 13 ... Oscillation circuit, 14 ... Control circuit, 15 ... Drive circuit, 16 ... Light emitting element, 17 ... Buffer circuit, 100 ... Clock body, 111 ... lower case, 112 ... upper case, 113 ... middle plate, 120 ... first drive system (second hand drive system), 121 ... second hand motor (first drive source), 122 ... first fifth wheel (first transmission) Gears, first detection gear), 122c... Through-hole, 123... Second hand wheel (second detection gear, first pointer wheel), 123c... Through-hole, 123d ... positioning light-shielding portion, 123e. Notch hole, 123g ... notch hole, 130 ... second drive system (hour / minute hand drive system), 131 ... hour / minute hand motor (second drive source), 132 ... second fifth wheel, 133c ... through hole, 134 ... minute hand wheel (fourth detection gear, second pointer wheel , 134c ... arc-shaped through hole, 134d ... arc-shaped through-hole, 134e ... arc-shaped through-hole, 134g ... groove (first index), 134p ... minute hand pipe, 135 ... sun wheel, 136 ... hour hand wheel (fifth) (Detection gear, second pointer wheel) 136c ... arc-shaped through hole, 136d ... arc-shaped through-hole, 136e ... arc-shaped through-hole, 136g ... groove (second index), 136p ... hour hand pipe, 140 ... light detection sensor , 142 ... light emitting element, 143 ... circuit board, 144 ... light receiving element, 150 ... manual correction system, 151 ... manual correction shaft, 151b ... head, 201 ... dial, 202 ... second hand, 203 ... minute hand, 204 ... hour hand, 1101... First antenna unit 1101a Core antenna 1101b Matching unit 1102 Second antenna unit 1102a Loop antenna 1102b Matching unit 1103 Long wave reception Road, 1401 ... internal clock, 1402 ... memory.

Claims (7)

A radio correction clock that corrects the time according to the standard time radio signal,
A first antenna portion formed of a core antenna;
A second antenna unit formed of a coreless antenna and having directivity different from that of the first antenna unit;
Control means for performing time correction based on the standard time radio signal received by the first and second antenna units;
The radio-controlled timepiece in which the first and second antenna units are arranged such that the directivities of the first and second antenna units are combined to become omnidirectional. 2. The radio-controlled timepiece according to claim 1, wherein the second antenna unit is formed of a coreless antenna having directivity orthogonal to at least the directivity of the first antenna unit. The first antenna part is formed of a ferrite core antenna,
The radio-controlled timepiece according to claim 1 or 2, wherein the second antenna unit is formed of a coreless loop antenna. The second antenna part is formed on the outer periphery of the watch,
4. The radio-controlled timepiece according to claim 1, wherein the first antenna portion is formed inside an outer peripheral portion of the timepiece on which the second antenna portion is formed. 5. The radio-controlled timepiece according to claim 1, wherein the second antenna portion is formed thinner than a thickness of a core portion of a core antenna of the first antenna portion. The said control means performs time correction based on the said standard time radio wave signal received with the said 1st antenna part or the 2nd antenna part with the better reception state of the said standard time radio wave signal. The radio wave correction watch according to any of the above. An internal clock,
A pointer driving system for driving a pointer wheel provided with a plurality of reference positions;
Reference position detection means for detecting the reference position of the pointer wheel,
The control means drives the pointer drive system and detects the reference position of the pointer wheel based on detection processing of the reference position detection means, and then receives the first antenna portion and the second antenna portion. The radio-controlled timepiece according to claim 1, wherein the time of the internal clock is corrected based on the standard time radio signal and the position of the pointer wheel is set based on the time of the internal clock. .

Images