JP4278448B2 - Antenna device for stationary radio wave correction watch - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is, for example, Located on the back of the watch housing Standard time radio signal is received by coreless loop antenna and time information is corrected. Rest Radio correction clock Antenna equipment It is about.
[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, and a standard radio wave transmission on Mt. Hagane, located on the border between Fukuoka Prefecture and Saga Prefecture 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.
In conventional radio-controlled timepieces, for example, a ferrite core antenna with a core has been used as an antenna unit that receives standard radio waves. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2001-272482 (FIG. 1-24)
[0004]
[Problems to be solved by the invention]
However, as described above, in the conventional radio-controlled timepiece, the ferrite antenna is used as the receiving antenna unit, and thus there is a problem that the thickness of the antenna unit becomes large and it is difficult to reduce the thickness.
[0005]
The present invention has been made in view of such circumstances, and an object of the present invention is to make the antenna portion thin. The loop antenna can be easily placed on the back of the watch housing Radio correction clock (Hereinafter referred to as “radio-correction watch”) antenna device Is to provide.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a first aspect of the present invention is a receiving means for receiving a standard time radio signal via a coreless loop antenna; A watch housing part having a variety of external shapes and projecting a protective case covering the timepiece mechanism on the back surface, outside the protective case to project, and lower than the height to the projecting end of the protective case, A loop antenna having a variable shape that is arranged along the periphery of the back surface of the various outer shapes of the watch housing portion, and a protrusion having a groove for attaching the loop antenna is provided in the loop of the periphery of the watch housing portion. Install multiple antennas at the corners An antenna mounting portion; and correction means for correcting a display time based on a standard time radio signal received by the receiving means.
[0008]
Furthermore, in order to achieve the object, a second aspect of the present invention includes a pointer driving system that drives a pointer that performs time display, a receiving unit that receives a standard radio signal via a coreless loop antenna, Correction means for correcting the display time based on the standard time radio signal received by the receiving means, the pointer drive system is embedded in the back plate of the watch casing, and the loop antenna is connected to the watch casing. Between the front surface and the back plate, it is formed in the outer peripheral part rather than the drive shaft of the pointer of the pointer drive system.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The radio-controlled timepiece according to the embodiment of the present invention has, for example, a coreless loop antenna as a receiving antenna, and the loop antenna is formed in, for example, a peripheral portion of a watch housing portion, a peripheral portion of a watch exterior portion, or the like. .
Hereinafter, it will be described in detail with reference to the drawings.
[0010]
FIG. 1 is an electrical functional block diagram of a first embodiment of a radio-controlled timepiece according to the present invention. 2 is a configuration diagram of the movement of the radio-controlled timepiece shown in FIG. 1, and FIG. 3 is an enlarged view of a cross section of the radio-controlled timepiece shown in FIG.
[0011]
As shown in FIGS. 1 to 3, the radio wave correction watch 1 according to the present 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 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 R5.
The control circuit 14 corresponds to correction means according to the present invention.
[0012]
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 reception system 11 includes an antenna unit 1101, a matching unit 1102, and a long wave reception circuit 1103.
[0013]
4 (a) is a front view of the radio wave correction watch shown in FIG. 1, FIG. 4 (b) is a right side view, FIG. 5 (a) is a back view of the radio wave correction watch shown in FIG. ) Is a cross-sectional view taken along line AA of the radio-controlled timepiece shown in FIG. FIG. 6 is an enlarged view of a cross section of the radio-controlled timepiece shown in FIG.
[0014]
On the front part of the radio-controlled timepiece 1, for example, as shown in FIG. 4A, a dial 201, a second hand 202 as a pointer, a minute hand 203, An hour hand 204 is provided.
[0015]
The loop antenna 1101 is attached by an antenna attachment portion formed at the periphery of the watch housing portion.
Specifically, on the back surface of the radio-controlled timepiece 1, for example, as shown in FIGS. 5 (a) and 5 (b), an antenna portion is provided on the peripheral portion (peripheral portion) of a housing portion (also referred to as an exterior portion) 301. A coreless loop antenna 1101 is formed. A mechanical mechanism 100 and an electric circuit system of the watch body are formed inside the protective case 302 inside the loop antenna 1101 at the periphery of the back surface.
In detail, for example, as shown in FIG. 6, the loop antenna 1101 is attached by antenna attaching means formed on the back plate 304 of the housing 301 and a groove 304 a as a latching portion. For example, the loop antenna 1101 may have a preset loop shape length or a preset shape.
[0016]
The groove part 304a is formed along the peripheral part (peripheral part) of the back plate 304 of the housing | casing part 301, for example, as shown to Fig.5 (a). The loop antenna 1101 is fixed with a shape along a groove 304 a formed in the peripheral portion of the watch housing 301.
For example, as shown in FIG. 5A, the loop antenna 1101 is thinner than the protective case 302 and thinner than the mechanical mechanism 100.
[0017]
The reception sensitivity when receiving the standard time radio signal of the loop antenna 1101 is substantially proportional to the area surrounded by the loop antenna 1101. For this reason, in order to enlarge the area of the loop antenna 1101, it is preferable to provide in the peripheral part of the housing | casing part 301. FIG.
In this embodiment, as described above, the loop antenna 1101 is formed in the peripheral portion of the casing 301, so that, for example, the standard time is received with substantially the same reception sensitivity as when a standard time radio signal is received by a conventional ferrite core antenna. Can receive radio signals.
[0018]
The installation position of the loop antenna 1101 is not limited to this form. For example, as shown in FIGS. 4 to 6, the loop antenna 1101 may be decoratively formed on a convex portion (front outer peripheral portion 301 a) formed on the front surface of the peripheral portion of the watch housing portion 301. By doing so, the area surrounded by the loop antenna 1101 can be increased, and the standard time radio signal can be received with higher sensitivity.
Further, the loop antenna 1101 may be decoratively formed along the periphery of the windshield 303 formed on the front surface of the dial 201.
[0019]
The loop antenna 1101 is deformed and fixed along a groove 304 a formed at the peripheral edge of the casing 301. For this reason, it can respond to the shape of the various housing parts 301 and the shape of the groove part 304a.
[0020]
The matching unit 1102 is configured by a capacitor (not shown), for example, and is connected to the loop antenna 1101 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.
[0021]
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 performs amplification processing, detection processing, and rectification based on signals input from the antenna unit 1101 and the matching unit 1102. Processing, integration processing, and the like are performed, and the processing result is output as a signal S11.
[0022]
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.
[0023]
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%.
[0024]
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.
[0025]
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.
[0026]
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.
[0027]
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.
[0028]
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.
[0029]
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.
[0030]
The memory 1402 is used as a work space of the control circuit 14, for example. For example, the memory 1402 is configured by a RAM (Random access memory) or the like.
[0031]
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.
[0032]
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.
[0033]
For example, the control circuit 14 samples the signal S11 input from the standard radio wave reception system 11 (for example, 32 Hz), detects the edge ed, and determines the reception state based on the presence or absence and the number of the edge ed.
[0034]
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.
[0035]
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.
[0036]
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.
[0037]
The drive circuit 15 includes a pnp transistor Q1 and resistors R1 and R2.
The base of the transistor Q1 is connected to the output line of the drive signal DR1 of the control circuit 14 via the resistor element R1, the collector is connected to the anode of the light emitting element 16 made of, for example, a light emitting diode, and the emitter is connected via the resistor element R2. Power supply voltage V _CC Connected to the supply line. The cathode of the light emitting element 16 is grounded.
The light emitting element 16 blinks in response to the drive signal DR1 output from the control circuit 14 at regular intervals.
[0038]
The drive circuit 18 is a drive circuit for the light transmission type photodetection sensor 140, and includes, for example, a pnp type transistor Q2 and resistance elements R3 and R4.
The emitter of the transistor Q2 is the power supply voltage V _CC The base is connected to the output line of the drive signal DR2 of the control circuit 14 via the resistance element R3, and the collector is connected to the light transmission type photodetection sensor 140 via the resistance element R4.
The drive circuit 18 supplies power to the light transmission type photodetection sensor 140 when the drive signal DR2 is output from the control circuit 14.
[0039]
As shown in FIG. 3, the light transmission type light detection sensor 140 is attached to the upper case 112 so as to face the light emitting element 142 and the light emitting element 142 made of a light emitting diode attached to the lower case 111, for example. And a light receiving element 144 made of a phototransistor.
[0040]
As shown in FIGS. 2 and 3, the sixth wheel 126, 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. When the long hole of the sixth wheel 126, the long hole of the second hand wheel 123, the long hole of the third wheel 133, the long hole of the minute hand wheel 134, and the long hole of the hour hand wheel overlap, the light emitting element 142 emits the light. The detected light is received by the light receiving element 144, and the light transmission type light detection sensor 140 is turned on.
The control circuit 14 detects the position of the pointer according to the state of the light transmission type light detection sensor 140.
[0041]
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.
[0042]
The collector of the light receiving element 144 is connected to the control circuit 14. The connection line to the control circuit 14 is an output line for the detection signal DT1 to the control circuit 14, and this output line is connected to the power supply voltage V via the resistor R5. _CC Connected to the supply line.
The light emitting element 142 is connected to the drive circuit 18 so as to emit light when a low level drive signal DR2 is output from the control circuit 14.
[0043]
Next, a specific configuration of the movement of the radio-controlled timepiece 1 and the pointer position detection system will be described with reference to FIGS.
As shown in FIGS. 2 and 3, the timepiece main body 100 has a lower case 111, an upper case 112 that are connected to face each other to form an outline, and a lower space in 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.
[0044]
A first driving system for driving a second hand as a first pointer with respect to predetermined positions of the lower case 111, the middle plate 113, and the upper case 112 in the space, that is, a second hand driving system 120 and a second pointer. A second drive system for driving the hour / minute hands, that is, an hour / minute hand drive system 130, a light transmission type light detection sensor 140, a manual correction system 150 for manually correcting the time, and the like are fixed or pivotally supported. ing.
[0045]
As described above, the second hand drive system 120 includes the stator 121a, the drive coil 121b wound around the leg piece on one side of the stator 121a, and the rotor that is rotatably rotated between the other magnetic poles of the stator 121a. No. 6 as a first detection gear (first transmission gear) meshed with the seventh wheel 127 and a seventh wheel 127 engaged with the pinion 121d of the rotor 121c, the second hand motor 121 constituted by 121c. The vehicle 126, a first fifth wheel 122 as an intermediate wheel meshed with the sixth wheel 126, and a second hand wheel 123 as a second detection gear meshed with the first fifth wheel 122 Has been.
[0046]
Here, the rotation direction, the rotation angle, and the rotation speed of the second hand motor 121 are controlled based on the control signal CTL 1 output from the control circuit 14. In the present embodiment, as a minimum unit when considering the movement of the drive system, it is referred to as one step that the control circuit 14 oscillates a pulse signal once to drive the motors 121 and 131 in pulses. . The actual length of the interval between steps is different between normal hand movement and fast-forwarding at time adjustment, and also differs between the second hand drive system and the hour / minute hand drive system.
[0047]
In the continuous hand movement, it is necessary to increase the reduction ratio from the rotor 121c to the second hand wheel 123 in order to smoothly move the second hand, that is, the second hand wheel 123 to which the second hand is attached. Therefore, in the present embodiment, the first fifth wheel 122 is meshed as an intermediate wheel between the sixth wheel 126 serving as the first detection gear and the second hand wheel 123 serving as the second detection gear. I earn. Incidentally, in the present embodiment, the sixth wheel is 40 steps / rotation, the second hand wheel is 960 steps / rotation, and the reduction ratio from the rotor 121c to the second hand wheel 123 is 1/480.
In this embodiment, the second hand reference position is detected by using a transmission portion and a light shielding portion provided on the sixth wheel 126 and the second hand wheel 123.
[0048]
The reference position of the second hand, that is, the second hand wheel 123 is obtained using only the sixth wheel 126 and the second hand wheel 123. The method focuses on one point where the long holes of the 6th wheel 126 and the second hand wheel 123 overlap and detects detection light for position detection there, and the 6th wheel 126 and the second hand wheel 123 are detected. The reference position is detected by discriminating the ON / OFF pattern of the light detection sensor generated by the long hole and the light shielding portion.
[0049]
As shown in FIGS. 2 and 3, the hour / minute hand driving system 130 as the second driving system includes a substantially U-shaped stator 131a, a driving coil 131b wound around one leg piece of the stator 131a, An hour and minute hand motor 131 constituted by a rotor 131c rotatably supported between the other magnetic poles of the stator 131a, a second fifth wheel 132 as an intermediate wheel meshing with a pinion 131d of the rotor 131c, As a third detection gear 133 (second transmission gear) meshed with the second fifth wheel 132, and as a fourth detection gear (second pointer wheel) meshed with the third wheel 133 A minute hand wheel 134, a minute wheel 135 as an intermediate wheel meshed with the minute hand wheel 134, and an hour hand wheel 136 as a fifth detection gear (second pointer wheel) meshed with the minute wheel 135 Consists of To have.
[0050]
Here, the rotation direction, the rotation angle, and the rotation speed of the hour / minute hand motor 131 are controlled based on the control signal CTL 2 output from the control circuit 14.
The third wheel & pinion 133 has three arc-shaped long holes having a predetermined width in the radial direction and extending by a predetermined length in the circumferential direction, and a portion between the long holes. A certain light shielding part is alternately arranged concentrically around the rotation axis of the third wheel & pinion 133.
[0051]
The minute hand wheel 134 has three arc-shaped long holes having a predetermined width in the radial direction and extending by a predetermined length in the circumferential direction, and a light shielding part between the long holes. The portions are alternately arranged concentrically around the rotation axis of the minute hand wheel 134.
[0052]
The hour hand wheel 136 has three arc-shaped long holes having a predetermined width in the radial direction and extending by a predetermined length in the circumferential direction, and a light shielding portion between the long holes. The portions are alternately arranged concentrically around the rotation axis of the hour hand wheel 136.
[0053]
In the present embodiment, the third wheel & pinion 133 is provided with three long holes as a transmission part for detecting the reference position. As in the case of the second hand wheel 123, in order to determine the reference position, the ON / OFF pattern of the light detection sensor generated by the long hole and the light shielding portion of the third wheel 133 and the minute hand wheel 134 is distinguished, and the minute hand according to the pattern. The reference position, for example, 0 minute, and the position indicating the reference position of the hour hand, for example, 0:00 are detected.
[0054]
The manual correction system 150 includes a minute wheel 135 that meshes with the minute hand wheel 134 and the hour hand wheel 136 described above, and a manual correction shaft 151 that meshes with the minute wheel 135 of this date. The manual correction shaft 151 is positioned outside the upper case 112 and has a head 151b that can be directly touched by a user.
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-mentioned hour / minute hand driving system 130, the minute hand wheel 134 is connected via the minute wheel 135. The pointer position can be manually corrected by rotating the head 151b with a finger when the hour / minute hand drive system 130 is not in operation.
[0055]
FIG. 9 is a flowchart showing a hand position detection process of the radio-controlled timepiece shown in FIG. The pointer position detection process will be described with reference to FIG.
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.
[0056]
Subsequently, the control signal CTL1 is output from the control circuit 14, the second hand 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 V _cc It is determined whether or not the level has been switched to the low level (ST103).
[0057]
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. Voltage V _cc It is determined whether or not the level has been switched from low to low (ST104 to ST106).
Even when the number of pulses reaches 9, the detection signal DT1 output from the phototransistor remains at the high level (power supply voltage V _cc If the level does not switch to the low level, the hour / minute hand motor 131 is driven by one step (pulse) (ST107), and then the second hand motor 121 is stepped again (ST102), and the second hand wheel 123 is rotationally driven. Is done.
[0058]
On the other hand, if it is determined in step ST103 that the detection signal DT1 from the phototransistor has been 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.
[0059]
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.
[0060]
Subsequently, the control signal CTL2 is output from the control circuit 14, only the hour / minute hand motor 131 is pulse-driven at a predetermined output frequency, and the minute hand wheel 134 is fast-forwarded (ST111).
[0061]
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.
[0062]
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 motor 131 is stopped. Then, the driving of the minute hand wheel 134 and the hour hand wheel 136 is stopped (ST113).
[0063]
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.
[0064]
FIG. 10 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. 10A, the output pattern of the phototransistor by the minute hand wheel 134 is an alternating width of two narrow B portions and one wide A portion as the off width on which the light shielding portion acts. As shown in FIG. 10B, 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. 10C, the 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. 10, 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.
[0065]
Further, for example, as the reference positions of the minute hand wheel 134 and the hour hand wheel 136, as shown in FIG. 10, the positions are set to 0:00, 4:00, and 8:00.
[0066]
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 composed 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 any one of these patterns is detected, the hour / minute hand motor 131 is set. Is stopped, the time of the minute hand wheel 134 and the hour hand wheel 136, that is, the minute hand and the hour hand can be adjusted to a predetermined time.
[0067]
After the hour / minute hand 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, and the light emission of the light emitting diode is stopped (ST114).
[0068]
FIG. 11 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG. The overall operation of the radio-controlled timepiece will be described with reference to FIG.
At the initial time or when the time adjustment switch 12 is operated, the control circuit 14 receives the standard time radio signal received by the antenna unit 1101 formed at the peripheral portion of the casing unit 301 and the matching unit 1102 and the long wave reception. The time information input via the circuit 1103 and timed by the internal clock 1401 is corrected (ST201).
After performing the train wheel position detection process as described above (ST202), the control circuit 14 sends a predetermined signal CTL2 to the hour / minute hand motor 131 and the second hand motor based on the time information measured by the internal clock 1401. The signal CTL1 is applied to 121, and the standard time is displayed on the second hand 202, the minute hand 203, and the hour hand 204 (ST203).
[0069]
As described above, the standard radio wave is received by the standard radio wave signal via the coreless loop antenna 1101 having a preset length, which is attached by the groove 304a as the antenna mounting means formed in the periphery of the watch main body. On the basis of the standard time radio signal received by the reception system 11, the hour / minute hand drive system 130 and the second hand drive system 120 for driving the hands for displaying the time, and the standard radio signal reception system 11, the hour / minute hand drive system 130 and the second hand drive system. Since the control circuit 14 that corrects the time according to the hands by driving 120 is provided, a radio-controlled timepiece having a thinner antenna portion than the conventional ferrite core antenna can be provided.
[0070]
In addition, the loop antenna 1101 is attached with a deformed shape along the groove 304a formed at the peripheral edge of the casing 301. Therefore, the loop antenna 1101 has various shapes of the clock casing 301 and the grooves. It can correspond to the shape of 304a.
[0071]
In addition, the loop antenna according to this embodiment does not have a core compared to the conventional antenna with a core that is easily affected by the surrounding metal, etc., so the reception characteristics of the antenna vary depending on the surrounding metal. Hard to do.
[0072]
FIG. 12 is a diagram for explaining a second embodiment of the radio-controlled timepiece according to the invention. FIG. 12A is a back view of the radio-controlled timepiece 1a according to the second embodiment, and FIG. 12B is an enlarged view of a part of the radio-controlled timepiece shown in FIG.
[0073]
The difference between the radio-controlled timepiece 1a according to the present embodiment and the first embodiment is that the form of the antenna mounting means is different.
For example, as shown in FIGS. 12A and 12B, the radio-controlled timepiece 1 a has a plurality of antenna mounting portions 305 as antenna mounting means for the flexible loop antenna 1101 in the peripheral portion on the back surface of the housing portion 301. Has been. In the present embodiment, the antenna mounting portion 305 is in a desired position at a position where the area of the antenna mounting portion 305 becomes larger so that the variable shape loop antenna 1101 forms a loop according to the peripheral portion of the housing portion 301. The number is formed.
[0074]
For example, as shown in FIG. 12B, the antenna attachment portion 305 is provided with a groove portion 305b in a projection portion 305a as a latching portion, and the loop antenna 1101 is fixed and attached by the groove portion 305b.
[0075]
As described above, in the present embodiment, a plurality of protrusions that are fixedly attached so that the loop antenna 1101 having a variable shape forms a loop around the periphery of the watch housing portion 301 as the antenna attachment portion and the latch portion. Since the portion 305a is provided, the loop antenna 1101 is attached so as to form a loop at the peripheral portion of the watch housing portion without forming a groove portion on the entire back surface as compared with the radio wave correction watch 1 according to the first embodiment. be able to.
[0076]
FIG. 13 is an electrical functional block diagram of a third embodiment of the radio-controlled timepiece according to the present invention. 14 is an overall view of the radio-controlled timepiece shown in FIG. 13, FIG. 14A is a front view, FIG. 14B is a back view, and FIG. 15 is a cross-sectional view of the radio-controlled timepiece shown in FIG. 16 is an enlarged view of a part of the radio-controlled timepiece shown in FIG. 15, and FIG. 17 is a cross-sectional view of the movement of the radio-controlled timepiece shown in FIG.
[0077]
The difference between the radio-controlled timepiece 1b according to the third embodiment and the first embodiment is that the main body is formed thinner. Only differences from the first and second embodiments will be described.
For example, the radio-controlled timepiece 1b according to this embodiment is a two-hand timepiece having a minute hand 203 and an hour hand 204 as shown in FIGS. 13 and 14, and includes a standard radio wave receiving system 11, a time correction switch 12, an oscillation circuit 13, and a control circuit. 14, the drive circuit 15, the light emitting element 16, the timepiece main body 100b, and the hour / minute hand motor 131 are main components.
The radio-controlled timepiece 1b does not have a pointer position detection mechanism for thinning, and the wheel train is not provided with a light shielding portion or a light transmitting portion. Further, no detection means such as an optical sensor is provided.
[0078]
For example, in the initial state, the control circuit 14 operates a predetermined switch or the like in a state where the pointer position is a reference position in advance, for example, with the hour and minute hands stopped at 0:00, so that the pointer position is set to 0:00 Is stored in the memory 1402. The control circuit 14 applies a predetermined drive signal CTL2 to the hour / minute hand motor 131 of the hour / minute hand drive system 130 based on the reference position of the pointer stored in the memory 1402 and the time information by the internal clock 1401, thereby The standard time is displayed with the minute hand.
Similarly to the first embodiment, the control circuit 14 corrects the time information of the internal clock 1401 based on the standard time radio signal received by the standard radio wave reception system 11.
[0079]
Next, the overall configuration of the radio-controlled timepiece and the specific configuration of the mechanical mechanism (movement) 100b will be described with reference to FIGS.
For example, as shown in FIGS. 15 and 16, the radio-controlled timepiece 1 b is provided with a minute hand 203 and an hour hand 204 between a receiving plate (back plate) 310 and a windshield 311. A dial 201 is formed inside the windshield 311 by printing or the like. A decorative plate 312 is provided on the front surface of the receiving plate 310.
A concave portion 310a is provided in the periphery of the receiving plate 310, and the receiving plate 310 is in contact with the windshield 311 in the concave portion 310a. A loop antenna 1101 is formed in a space 310b surrounded by the receiving plate (back plate) 310, the recess 310a, and the windshield 311 on the front face of the watch.
More specifically, the loop antenna 1101 is disposed between the windshield 311 and the receiving plate (back plate) 310 that are the front surface of the watch housing portion, and more on the outer periphery than the driving shaft 100c of the pointer of the movement 100 that is a pointer driving system. Is formed.
[0080]
A recess 310c is formed at the center of the receiving plate (back plate) 310, and the movement 100b is embedded in the recess 310c. In order to reduce the thickness, it is preferable that the back surface of the receiving plate 310 and the back surface of the movement 100b be flat.
[0081]
As shown in FIG. 17, the movement 100 b includes an upper plate 3001 and a lower plate 3002 that are connected to face each other to form a contour. In the space formed by the upper plate 3001 and the lower plate 3002, a second drive system for driving the hour / minute hands with respect to a predetermined position, that is, the hour / minute hand drive system 130 is fixed or pivotally supported.
[0082]
The hour / minute hand drive system 130 according to the present embodiment includes a substantially U-shaped stator 131a, a drive coil 131b (not shown) wound around one leg piece of the stator 131a, and the other magnetic pole of the stator 131a. The hour and minute hand motor 131, which is constituted by a rotor 131c rotatably supported in FIG. 5, a fifth wheel 332 as an intermediate wheel meshing with the pinion 131d of the rotor 131c, and a fourth wheel meshing with the fifth wheel 332 333, a third wheel 334 that meshes with the fourth wheel 433, a minute wheel 335 that meshes with the third wheel 334, and a minute hand wheel 336 and an hour hand wheel 337 that mesh with the minute wheel 335 of the day. Has been.
The hour hand 204 is held by the outer peripheral portion of the hour hand pipe, and the minute hand 203 is held by being inserted into the minute hand wheel 336.
[0083]
The hour / minute hand motor 131 has its rotation direction, rotation angle, and rotation speed controlled based on a control signal CTL 2 output from the control circuit 14.
The driving force by the hour / minute hand motor 131 is transmitted from the rotor 131c to the fifth wheel 332, the fourth wheel 333, the third wheel 334, and the minute wheel 335, and the minute wheel 336 having a different reduction ratio from the minute wheel 335. And transmitted to the hour hand wheel 337.
[0084]
The operation of the radio-controlled timepiece having the above-described configuration will be briefly described.
The memory 1401 stores the fact that the pointer position is set to 0:00 by operating a predetermined switch or the like with the hour and minute hands stopped at a reference position in advance, for example, at 0:00. 1402 is stored.
[0085]
The control circuit 14 applies a predetermined drive signal CTL2 to the hour / minute hand motor 131 of the hour / minute hand drive system 130 based on the reference position stored in the memory 1402 and the time information by the internal clock 1401, thereby Display the standard time.
[0086]
As described above, in the present embodiment, it is formed between the windshield 311 and the back plate 310 on the front surface of the watch housing portion, and is formed on the outer peripheral portion than the drive shaft of the pointer of the hour / minute hand drive system 130. A movement 110b including a loop antenna 1101 and an hour / minute hand drive system 130 is embedded in the back plate 310, provided in the center of the back plate 310 so that the back surface is flat, and a memory 1402 for storing the reference position of the pointer Based on the reference position of the pointer stored in the memory 1402 and the standard time radio wave signal received by the standard radio wave receiving system 11 via the loop antenna 1101, the hour / minute hand drive system 130 is driven to correct the time based on the pointer. Since the control circuit 14 is provided, a thinner radio-controlled timepiece can be provided as compared with the first and second embodiments. In the present embodiment, since the pointer position by the optical sensor or the like is not detected, the watch main body and the watch housing can be formed thinner.
[0087]
Note that the present invention is not limited to the present embodiment, and various suitable modifications can be made.
In the present embodiment, the loop antenna 1101 is formed in the peripheral part of the watch housing part, but is not limited to this form. The shape, formation position, etc. of the loop antenna 1101 may be any as long as reception sensitivity capable of decoding time information by a standard time radio signal can be obtained.
[0088]
In the first embodiment and the second embodiment, the embodiment using the analog hands as the time display has been described. However, the present invention is not limited to this embodiment. For example, digital time display may be performed by a liquid crystal display unit or the like.
[0089]
【The invention's effect】
According to the present invention, it is possible to provide a radio-controlled timepiece having a thin antenna portion.
[Brief description of the drawings]
FIG. 1 is an electrical functional block diagram of a first embodiment of a radio-controlled timepiece according to the present invention.
2 is a configuration diagram of the movement of the radio-controlled timepiece shown in FIG. 1. FIG.
FIG. 3 is an enlarged view of a cross section of the radio wave correction watch shown in FIG. 2;
4 is an overall view of the radio-controlled timepiece shown in FIG. 1, (a) is a front view of the radio-controlled timepiece shown in FIG. 1, and (b) is a right side view.
5 is an overall view of the radio-controlled timepiece shown in FIG. 1, (a) is a rear view of the radio-controlled timepiece shown in FIG. 1, and (b) is an A of the radio-controlled timepiece shown in FIG. 4 (a). It is sectional drawing along the -A line.
6 is an enlarged view of a cross section of the radio-controlled timepiece shown in FIG. 5 (b).
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 flowchart showing a hand position detection process of the radio-controlled timepiece shown in FIG. 1;
10 is a diagram for explaining an output pattern of detection light of the radio-controlled timepiece shown in FIG. 1; FIG.
11 is a flowchart for explaining the operation of the radio-controlled timepiece shown in FIG.
FIG. 12 is a diagram for explaining a second embodiment of the radio-controlled timepiece according to the invention. (A) is a back view of the radio-controlled timepiece 1a according to the second embodiment, and (b) is an enlarged view of a part of the radio-controlled timepiece shown in FIG. 12 (a).
FIG. 13 is an electrical functional block diagram of a third embodiment of the radio-controlled timepiece according to the invention.
14 is an overall view of the radio-controlled timepiece shown in FIG. (A) is a front view, (b) is a back view.
15 is a cross-sectional view of the radio wave correction watch shown in FIG.
16 is an enlarged view of a part of the radio-controlled timepiece shown in FIG.
17 is a sectional view of the movement of the radio-controlled timepiece shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,1a, 1b ... Radio 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, 18 ... Drive circuit, 100, 100b ... clock body (mechanical mechanism: movement), 111 ... lower case, 112 ... upper case, 113 ... middle plate, 120 ... first drive system (second hand drive system), 121 ... second hand motor ( 1st drive source), 122 ... 1st fifth wheel (first transmission gear, first detection gear), 123 ... Second hand wheel (second detection gear, first pointer wheel), 126 ... 6th wheel, 127 ... 7th wheel, 130 ... 2nd drive system (hour / minute hand drive system), 131 ... hour / minute hand motor (second drive source), 132 ... 2nd fifth wheel, 133 ... 3rd wheel, 134 ... minute hand Car (second indicator wheel), 135 ... Sunday car, 136 ... hour hand wheel Second hand wheel), 140 ... Light detection sensor, 142 ... Light emitting element, 143 ... Circuit board, 144 ... Light receiving element, 150 ... Manual correction system, 151 ... Manual correction axis, 201 ... Dial, 202 ... Second hand, 203 ... Minute hand, 204 ... hour hand, 301 ... casing (exterior), 301a ... front outer periphery, 302 ... protective case, 304 ... back plate, 304a ... groove, 305 ... antenna mounting portion, 310 ... receiving plate (back plate) , 310a ... recess, 310b ... space, 310c ... recess, 311 ... windshield, 312 ... decorative plate, 1101 ... antenna part (loop antenna), 1102 ... matching part, 1103 ... long wave receiving circuit, 1401 ... internal clock, 1402 ... Memory, 3001 ... upper plate, 3002 ... lower plate.

Claims (2)

Receiving means for receiving a standard time radio signal via a coreless loop antenna;
A watch housing portion having various outer shapes and projecting a protective case covering the watch mechanism on the back surface;
A variable-shaped loop antenna disposed along the periphery of the back surface of various outer shapes of the timepiece housing portion, outside the protective case to be projected and lower than the height to the protruding end of the protective case. An antenna mounting portion provided with a plurality of protrusions having grooves for attaching the loop antenna at a point where the loop antenna bends around the timepiece housing portion ;
An antenna device for a stationary radio wave correction watch , comprising: correction means for correcting a display time based on a standard time radio signal received by the reception means. It has a pointer drive system that drives a pointer that displays the time,
The antenna device for a stationary radio wave correction timepiece according to claim 1, wherein the correction unit drives the pointer driving system to correct a display time by the pointer based on the standard time radio wave signal received by the reception unit .

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