JP5211818B2 - Electronic clock with built-in antenna - Google Patents

Description

  The present invention relates to an antenna built-in type electronic timepiece represented by a radio-controlled timepiece that receives external wireless information including time information and performs processing such as time correction.

Conventionally, an electronic timepiece with a built-in antenna such as a radio-controlled timepiece that receives time information from the outside and corrects the time is known. The electronic timepiece with a built-in antenna includes a receiving antenna having a long magnetic core made of a magnetic material and a coil formed by winding a copper wire around the center of the magnetic core.
The receiving antenna is housed in a limited space in the outer case together with various storage items such as a clock mechanism. Therefore, it is difficult to increase the antenna itself and improve the reception sensitivity of the antenna due to space restrictions.
In addition, when the exterior case is viewed in plan view from the thickness direction of the watch, the watch mechanism is located at the center of the exterior case, so the antenna is positioned outside the watch mechanism, that is, close to the exterior case. It is arranged at the position to do. Therefore, when an antenna is disposed in a metal outer case, there is a problem that the antenna is affected by the metal outer case and the reception sensitivity of the antenna is lowered.
The following structures for improving the reception sensitivity are known for the problem of the space limitation of the antenna and the problem of a decrease in the reception sensitivity (see, for example, Patent Document 1 and Patent Document 2).
In the wristwatch described in Patent Document 1, an amorphous thin film, which is a magnetic member, is attached to each end of a core case that houses a magnetic core with an adhesive or the like. This amorphous thin film is provided so as to pseudo-expand the magnetic core in the direction in which the magnetic core extends, and enhances the magnetic flux collecting effect of the magnetic core.
In the radio-controlled timepiece described in Patent Document 2, a cover member made of a magnetic member that covers the coil of the antenna and having a U-shaped cross section is provided. This cover part acts as a magnetic flux bypass path for avoiding the influence of the metal outer case, and suppresses a decrease in the receiving sensitivity of the antenna.

JP 2007-184894 A (paragraph 0049, FIG. 3, FIG. 12) JP 2006-340101 A (paragraph 0051, FIG. 2)

However, in the wristwatch described in Patent Document 1, the amorphous thin film is bonded to the core case, but the amorphous thin film is not fixed sufficiently because the stretched portion of the amorphous thin film protrudes from the end of the core case. There is a problem of strength. On the other hand, when the stretched part of the amorphous thin film is also bonded to the back surface of the dial, the amorphous thin film is fixed to both the core case and the dial, so that the core is affected by an external impact. There is also a problem that the amorphous thin film is easily damaged when the case and the dial are relatively displaced. Moreover, since the amorphous thin film is fixed by adhesion, there is a problem that workability such as assembly work of the antenna and removal work at the time of parts replacement and the like is deteriorated.
In addition, the radio-controlled timepiece described in Patent Document 2 has a problem that since the cover member needs to be formed in a U-shaped cross section, the processing work of the magnetic member becomes complicated and the processing cost increases. In particular, when the cover member is formed by cutting or molding the magnetic member, the processing cost becomes great.
Such a problem is not limited to the radio-controlled timepiece, and is a problem common to various electronic timepieces with a built-in antenna for wireless communication.

  The object of the present invention is to improve the reception sensitivity of radio waves by placing a magnetic member in the vicinity of an antenna, and the magnetic member can be easily incorporated into and removed from the outer case, thereby reducing the number of manufacturing steps. Another object of the present invention is to provide an electronic timepiece with a built-in antenna capable of stabilizing the quality of an antenna by preventing damage to a magnetic member due to an external impact.

  An electronic timepiece with built-in antenna of the present invention is an electronic timepiece with built-in antenna comprising an exterior case and a module housed in the exterior case, the module comprising a non-conductive ground plane, external wireless information A receiving means for processing the external wireless information received by the antenna, a magnetic member provided in the vicinity of the antenna, and a drop-off preventing portion for preventing the magnetic member from dropping off. The magnetic member is housed in a housing recess formed in a ground plate, and the drop-off prevention unit is provided to cover at least a part of the housing recess.

  In this configuration, the magnetic member in the vicinity of the antenna is housed in the housing recess formed in the ground plate, and is held by the drop-off prevention unit so as not to fall out of the housing recess. Compared to the case where the magnetic member is bonded to the end of the core case as in the prior art, in the present invention, there is no bonding work to fix the magnetic member by bonding, and the work of assembling the antenna or removing the work such as replacing parts Can be improved. Further, when positioning the magnetic member, it is possible to position the magnetic member simply by storing it in a storage recess formed in advance on the base plate, so that assembly is easy and reproducibility is enhanced. In addition, since there is no work of attaching a magnetic member to the antenna in advance and taking the magnetic member into the outer case integrally with the antenna as in the past, it is possible to prevent the magnetic member from being damaged during the assembly work. .

Furthermore, since the magnetic member is fixed to the base plate by the storage recess and the drop-off preventing portion, if the storage recess is provided in accordance with the shape of the magnetic member, the magnetic member itself is complicated to fix the magnetic member. There is no need, and the magnetic member can be made into a simple shape. Therefore, as compared with the conventional case where the magnetic member is processed into a U-shape, the magnetic member can be easily processed, and an increase in manufacturing cost can be suppressed.
Also, since the magnetic member is housed in the housing recess and is provided so as not to fall out of the housing recess by the fall-off preventing portion, the magnetic member projects from the core case end as in the conventional case. Compared to the case of bonding, the magnetic member can be prevented from being damaged by an external impact, and a reinforcing measure for preventing damage due to stress or the like becomes unnecessary.
As described above, when a magnetic member is placed in the outer case, a magnetic member having a complicated structure or an unstable assembly element such as adhesion is not required, and the magnetic member can be easily incorporated into and removed from the outer case. This makes it possible to reduce manufacturing man-hours. Furthermore, since the magnetic member can be prevented from being damaged by an external impact, the quality such as the reception sensitivity of the antenna can be stabilized.

  In the electronic timepiece with built-in antenna of the present invention, the antenna has a longitudinal magnetic core and a coil, and the magnetic core includes a coil winding portion around which the coil is wound, and both ends of the coil winding portion. A pair of lead portions projecting to the side, and the storage recess is located at a position that does not overlap a coil facing region facing the coil on the back surface opposite to the display side of the base plate, and on the lead portion. It is preferable to be provided at a position that overlaps at least a part of the opposing lead portion facing region.

The present invention relates to a structure for holding a magnetic member in the case where the magnetic member is provided in order to enhance a magnetic flux collecting effect. That is, by providing the magnetic member at a position closest to the lead portion of the antenna, the magnetic flux lines collected on the magnetic member are efficiently guided from the lead portion into the coil, and the reception performance of the antenna is improved.
In this invention, on the back side surface of the ground plane, the magnetic member is stored in a position that does not overlap the coil facing region facing the coil but overlaps a part of the lead portion facing region facing the lead portion of the magnetic core. A recess is provided. That is, when the timepiece is viewed in plan from the thickness direction, the magnetic member is fixed to the base plate so as not to overlap with the coil but to overlap with a part of the lead portion. The coil facing region and the lead portion facing region are a region where the coil faces and a region where the lead portion of the magnetic core faces when the ground plane is viewed in plan view from the thickness direction of the watch. The region closest to the coil and the lead portion opposing region are the regions closest to the lead portion.
According to this configuration, the housing recess is formed at a position closest to the lead portion of the magnetic core on the back side surface of the base plate, and the magnetic member is held at this position. Can be obtained. At this time, since the magnetic member is not provided in the coil facing region, the magnetic flux lines can be effectively collected in the lead portions at both ends of the magnetic core, and extend from one end to the other end of the magnetic core. A magnetic path can be easily formed. In addition, it is preferable to use a material having a magnetic permeability equal to or higher than the magnetic permeability of the magnetic core of the antenna for the magnetic member provided to enhance the magnetic flux collecting effect.

  In the electronic timepiece with built-in antenna according to the present invention, the electronic timepiece includes a non-conductive wheel train bearing that is disposed to face the back side surface of the main plate and supports the train wheel, and the train wheel bridge includes at least the housing recess. An extension portion extending to a position overlapping with a part thereof, the storage recess has a depth dimension similar to a thickness dimension of the magnetic member, and the drop-off prevention section includes the magnetic member It is preferable that the extended portion is sandwiched between the base plate.

  According to this configuration, since the magnetic member in the storage recess is sandwiched between the extended portion of the train wheel bridge and the base plate, the magnetic member is securely fixed to the base plate without using fixing means such as adhesion. be able to. At this time, the extending portion only needs to extend a part of the existing train wheel bridge, and it is not necessary to use a new member as a drop-off preventing portion, so the number of parts does not increase and the assembly work is easy. Become.

  In the electronic timepiece with built-in antenna according to the present invention, the storage recess has a depth that is approximately the same as the thickness of the magnetic member, and the drop-off prevention portion holds the magnetic member between the base plate and the base plate. It is preferable that the lead portion is configured.

  According to this configuration, since the magnetic member in the storage recess is sandwiched between the lead portion of the magnetic core and the ground plate, the magnetic member can be securely fixed to the ground plate without using fixing means such as adhesion. Can do.

  In the antenna built-in type electronic timepiece according to the aspect of the invention, it is preferable that the drop-off preventing portion is a caulking portion in which at least a part of the opening of the housing recess is caulked.

  According to this configuration, the magnetic member in the storage recess is fixed by the crimping portion formed in the opening of the storage recess. Specifically, a dowel for caulking or the like is formed in advance in the housing recess, and when the magnetic member is housed, the dowel or the like may be caulked. Since the caulking portion covers at least a part of the storage recess, the magnetic member can be reliably fixed to the ground plane without using fixing means such as adhesion. In addition, since a new member does not have to be used as the drop-off prevention unit, the number of parts does not increase and a simple structure can be achieved.

  In the antenna built-in type electronic timepiece of the invention, it is preferable that the magnetic member is formed by laminating two or more metal magnetic foils.

  According to this configuration, since the magnetic member is formed by laminating two or more metal magnetic foil materials, the thickness dimension of the metal magnetic foil material is increased, and the magnetic flux collecting effect can be further enhanced. The reception sensitivity of the antenna can also be improved. In addition, the distance between the magnetic core lead portion and the magnetic member can be made closer, and more magnetic flux lines can be passed through the magnetic member, so that eddy current loss occurs when the magnetic flux lines pass through the body portion. Can be further suppressed, and the deterioration of the antenna characteristics of the antenna can be more efficiently suppressed.

In the electronic timepiece with built-in antenna according to the present invention, the magnetic member is preferably made of an amorphous metal.
Here, examples of the amorphous metal include cobalt-based amorphous (Co—Fe—Ni—B—Si).

The amorphous metal has a magnetic permeability much higher than that of a metal such as titanium or brass constituting the outer case. Therefore, by arranging amorphous metal close to the lead part of the magnetic core, the magnetic flux collection effect can be enhanced, and the magnetic flux lines input from the lead part into the antenna increase, further improving the reception performance of the antenna. Can be made.
In addition, since amorphous metal has a lower conductivity than a metal such as titanium or brass constituting the outer case, eddy current hardly occurs even when magnetic flux lines pass through the inside. Therefore, almost no eddy current loss occurs when the magnetic flux lines pass through the inside of the metal member, and the deterioration of the antenna characteristics due to the eddy current loss can be further suppressed.

  According to the present invention, when the magnetic member is arranged in the vicinity of the antenna to improve the radio wave reception sensitivity, the magnetic member can be easily incorporated into and removed from the outer case, and the number of manufacturing steps can be reduced. There is an effect that the quality of the antenna can be stabilized by preventing the magnetic member from being damaged by an external impact.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a radio-controlled timepiece (hereinafter referred to as a timepiece 1) as an electronic timepiece with built-in antenna according to an embodiment of the present invention.

[Overall configuration of the watch]
In FIG. 1, a timepiece 1 is a pointer-type timepiece (analog timepiece) provided with hands 11, 12, 13 and a dial 14 and receives and receives a long-wave standard radio wave as external wireless information having time information. This is a timepiece capable of correcting the position of the hands 11, 12, and 13 based on the time information.
This timepiece 1 includes hands 11, 12, 13, a dial 14, an antenna 21 that receives standard radio waves, and a module 10 that incorporates various components that control driving of the hands 11, 12, 13, And an exterior case 100 that accommodates the hands 11, 12, 13, dial 14, module 10, and the like.

[Configuration of exterior case and module]
The exterior case 100 and the module 10 constituting the timepiece 1 will be described with reference to FIGS.
FIG. 2 is a plan view showing a schematic configuration of the inside of the timepiece 1 as seen from the back cover side, and FIG. 3 is a side cross-sectional view of the timepiece 1 taken along the thickness direction.
As shown in FIG. 2 or FIG. 3, the outer case 100 is attached to the casing 110 as a trunk, a cover glass 120 mounted on the front surface side of the casing 110, and the back surface (lower end surface) side of the casing 110. And a metal back cover 130.
The casing 110 is made of a metal material such as stainless steel, brass, or titanium. The casing 110 is formed in a substantially cylindrical shape, and the inner peripheral surface is formed in a substantially circular plane.

The module 10 has a module middle frame 15 made of a synthetic resin and having a circular shape in plan view. A plurality of protrusions (not shown) that contact the inner peripheral surface of the outer case 100 in the radial direction are formed on the side surface of the module middle frame 15, and these protrusions are formed on the inner periphery of the outer case 100. It is arranged along the surface.
A ground plate 50 made of a non-conductive material is fitted inside the module middle frame 15, and a dial plate 14 is disposed on the surface side of the ground plate 50. A train wheel bridge 44 made of a non-conductive material is disposed on the back cover 130 side of the base plate 50 so as to face the base plate 50. A wheel train 43 for driving the hands 11, 12, and 13 is provided at the center of the main plate 50, and these wheel trains 43 are supported by a base plate 50 and a train wheel bridge 44. On the outer peripheral side of the train wheel 43, the antenna 21 that receives radio waves is fixed to the main plate 50 at a position close to the casing 110.
The ground plane 50 includes a circuit board (not shown) to which a receiving IC, a CPU, a reference vibrator, and the like are attached, a motor that constitutes a part of the driving means, and a high-capacity secondary power source that constitutes a power supply means (secondary battery). ) Various components such as 72 are incorporated.

[Circuit configuration of the watch]
FIG. 4 is a block diagram showing a schematic configuration of the timepiece 1.
As shown in FIG. 4, the circuit board incorporated in the module 10 includes a receiving unit 20 that processes received radio waves, a drive control circuit unit 30, a driving unit 40 that drives a pointer, and a counter unit that counts time. 60 are provided as various circuit configurations.

  The receiving means 20 includes an antenna 21 that receives radio waves, a tuning circuit unit 22 that is configured by a capacitor and tunes to the radio waves received by the antenna 21, a reception circuit unit 23 that processes information received by the antenna 21, and a reception A time data storage circuit unit 24 that stores time data processed by the circuit unit 23 is provided.

FIG. 5 is a block diagram showing a configuration of the receiving circuit unit 23 of the timepiece 1.
As shown in FIG. 5, the tuning circuit unit 22 includes two capacitors 22A and 22B connected in parallel to the antenna 21, and one capacitor 22B is connected to the antenna 21 via a switch 22C. ing.
The frequency of the radio wave received by the antenna 21 is switched by turning on or off the switch 22C according to a frequency switching control signal output from the drive control circuit unit 30. As a result, for example, in Japan, two types are output from the standard radio wave output station of Otakado and Mt. (East Japan) with a transmission frequency of 40 kHz and the standard radio wave output station of Mt. Hagane (West Japan) with a transmission frequency of 60 kHz. It is configured to be able to switch and receive a long wave standard radio wave having a frequency of.

The receiving circuit unit 23 amplifies a long wave standard radio signal received by the antenna 21, a bandpass filter 232 that extracts only a desired frequency component from the amplified long wave standard radio signal, and a long wave standard radio signal. The demodulating circuit 233 for smoothing and demodulating, the AGC (Automatic Gain Control) circuit 234 for controlling the gain of the amplifying circuit 231 and controlling the reception level of the long wave standard radio wave signal to be constant, and the demodulated long wave standard radio wave signal And a decoding circuit 235 for decoding and outputting.
The time data received and signal-processed by the receiving circuit unit 23 is output and stored in the time data storage circuit unit 24 as shown in FIG.
The reception circuit unit 23 starts reception of time information based on a reception control signal output from the drive control circuit unit 30 by a preset schedule or a forced reception operation by the external input device 8.

  As shown in FIG. 4, the pulse signal from the pulse synthesis circuit 31 is input to the drive control circuit unit 30. The pulse synthesizing circuit 31 divides a reference pulse from a reference oscillator 311 such as a crystal oscillator to generate a clock pulse, and generates a pulse signal having a different pulse width and timing from the reference pulse. The reference vibrator 311 is connected to the CPU and becomes a clock signal of the circuit. However, since the frequency is close to the long wave reception frequency and the signal may be mixed as noise into the antenna 21, the reference vibrator 311 is separated from the antenna 21. Are arranged.

  The drive control circuit unit 30 outputs a second drive pulse signal PS1 that is output once per second to drive the second hand and an hour / minute drive pulse signal PS2 that is output once per minute to drive the hour / minute hand. The time is output to the drive circuit 42 to control the driving of the hands. That is, each drive circuit 41, 42 drives a second motor 411 and an hour / minute motor 421 that are stepping motors driven by pulse signals from the drive circuits 41, 42, and is thereby connected to each motor 411, 421. The second hand, the minute hand and the hour hand are driven. Each pointer, dial, motors 411 and 421, and drive circuits 41 and 42 constitute time display means for displaying the time. In addition, as a time display means, you may drive an hour hand, a minute hand, and a second hand with one motor.

The counter unit 60 includes a second counter circuit unit 61 that counts seconds and an hour / minute counter circuit unit 62 that counts hours and minutes.
The second counter circuit unit 61 includes a second position counter 611, a second time counter 612, and a coincidence detection circuit 613. The second position counter 611 and the second time counter 612 are both 60 counts, that is, a counter that loops in 60 seconds when a 1 Hz signal is input. The second position counter 611 counts the drive pulse signal (second drive pulse signal PS1) supplied from the drive control circuit unit 30 to the second drive circuit 41. That is, the position of the second hand indicated by the second hand is counted by counting the drive pulse signal for driving the second hand.
The second time counter 612 normally counts a 1 Hz reference pulse signal (clock pulse) output from the drive control circuit unit 30. When the time data is received by the receiving means 20, the counter value is corrected according to the second data of the time data.

Similarly, the hour / minute counter circuit unit 62 includes an hour / minute position counter 621, an hour / minute time counter 622, and a coincidence detection circuit 623. Both the hour / minute position counter 621 and the hour / minute time counter 622 are counters that loop when signals for 24 hours are input. The hour / minute position counter 621 counts the drive pulse signal (hour / minute drive pulse signal PS2) supplied from the drive control circuit unit 30 to the hour / minute drive circuit 42, and counts the position of the hour / minute hands indicated by the hour hand and minute hand. doing.
The hour / minute / time counter 622 normally counts a 1 Hz pulse (clock pulse) output from the drive control circuit unit 30 (more precisely, 1 Hz is counted once when it is counted 60 times). When the time data is received by the receiving means 20, the counter value is corrected according to the hour / minute data of the time data.

The coincidence detection circuits 613 and 623 detect coincidence of the count values of the position counters 611 and 621 and the time counters 612 and 622, and output a detection signal indicating whether or not they coincide to the drive control circuit unit 30. To do.
When the mismatch signal is input from the match detection circuits 613 and 623, the drive control circuit unit 30 continues to output the drive pulse signals PS1 and PS2 until the match signal is input. Therefore, during normal hand movement, when the counter values of the time counters 612 and 622 are changed by the reference signal of 1 Hz from the drive control circuit unit 30 and do not coincide with the position counters 611 and 621, the drive pulse signals PS1 and PS2 are output. As the hands move, the position counters 611 and 621 coincide with the time counters 612 and 622. By repeating this operation, normal hand movement control is performed.
Further, when the time counters 612 and 622 are corrected with the received time data, the drive pulse signals PS1 and PS2 continue to be output until the counter values of the position counters 611 and 621 coincide with the counter values, and the pointer is fast-forwarded. Is corrected to the correct time.

  The power supply means 70 includes a power generation device 71 as a power generation means configured by a self-winding generator, a solar battery (solar generator), and the like, and a high-capacity secondary power source 72 that stores the power generated by the power generation device 71. It is configured with. As the high capacity secondary power source 72, a secondary battery such as a lithium ion battery can be used. As the power supply means 70, a primary battery such as a silver battery may be used. Further, the high-capacity secondary power source 72 is formed of a stainless steel case, and in order to suppress the influence on the antenna characteristics, as shown in FIG. It is arranged at the position.

  The external input device 8 as an external input means includes a crown and is used for performing a receiving operation, time adjustment, and the like.

[Configuration of antenna]
As shown in FIG. 2, the antenna 21 is arranged at a position in the 9 o'clock direction of the timepiece substantially along the inner surface of the module middle frame 15. The antenna 21 includes a magnetic core 211 and a coil 212 wound around the center of the magnetic core 211.
As shown in FIG. 2, the magnetic core 211 has a linear coil winding portion 211 </ b> C around which the coil 212 is wound, and a casing 110 that forms the trunk portion of the outer case 100 from both ends of the coil winding portion 211 </ b> C. And a lead portion 211D protruding in a state along the circumference.
As shown in FIG. 3, the magnetic core 211 has a substantially square cross section, and the coil 212 has a substantially square cross section.

  The magnetic core 211 is formed by, for example, punching a cobalt-based amorphous foil (e.g., Co 50 wt% or more amorphous foil) with a mold, or bonding about 10 to 30 pieces formed by etching, and superposing and annealing. Heat treatment is performed to stabilize the magnetic properties. That is, the magnetic core 211 is configured by laminating a planar amorphous foil in the thickness direction of the watch (the vertical direction in FIG. 3). Note that the magnetic core 211 is not limited to the laminated amorphous foil, and ferrite may be used. In this case, the magnetic core 211 may be formed by a mold or the like and heat-treated.

The coil 212 requires an inductance value of about 10 to 50 mH when receiving a long wave standard radio wave (40 to 77.5 kHz). For this reason, in this embodiment, the coil 212 is formed by winding a uremet wire having a diameter of about 0.1 μm for several hundred turns.
As shown in FIG. 2, the coil 212 includes a first coil end portion 212 </ b> A having a predetermined dimension from one end portion (first core end portion 211 </ b> A) of the magnetic core 211, and the other end portion of the magnetic core 211 ( The coil winding portion 211C extending from the second core end portion 211B) to the second coil end portion 212B having a predetermined dimension is wound around the circumferential surface along the circumferential direction with the longitudinal direction of the magnetic core 211 as an axis. ing.

  The antenna 21 and a receiving IC (not shown) are connected by two wires. That is, the antenna 21 and the receiving IC are electrically connected by taking out the coil 212 from the end of the antenna and soldering it to the circuit board. As a result, the standard radio wave received by the antenna 21 can be output to the receiving means 20. The electrical connection may be performed by attaching a flexible substrate made of polyimide or the like to the antenna 21 and screwing the substrate to the circuit substrate.

[Configuration of magnetic member]
As shown in FIG. 2, around the antenna 21, a plurality of amorphous foil materials 80 as magnetic members are respectively housed in a plurality of housing recesses 53 formed on the ground plane 50. The amorphous foil material (metal magnetic foil) 80 is composed of a pair of first amorphous foil materials 81 disposed on both ends of the antenna 21 and a second amorphous foil material 82 disposed on the outer peripheral side of the coil 212. It is configured. The ground plane 50 is formed with a pair of first storage recesses 531 in which the first amorphous foil material 81 is stored and a second storage recess 532 in which the second amorphous foil material 82 is stored. Yes. Hereinafter, the structure of the amorphous foil material 80 and the fixing structure to the ground plane 50 will be described with reference to FIGS. 6 and 7 as well.

FIG. 6 is a side sectional view showing a state in which the first amorphous foil material 81 is fixed to the ground plane 50, and showing the antenna 21 of FIG. 2 in a section passing through the central axis of the magnetic core 211.
As shown in FIG. 6, the pair of first storage recesses 531 are located on the back cover side surface (upper surface in the drawing) of the base plate 50 at a position that does not overlap with the coil facing region 50 </ b> A facing the coil 212. And it is formed in the position which overlaps a part of a pair of lead part opposing area | region 50B which opposes a pair of lead part 211D, respectively.
Here, each of the pair of first amorphous foil members 81 is formed to extend in the protruding direction of the lead portion 211D (a direction away from the coil 212) in plan view. Further, the thickness dimension of the first amorphous foil material 81 is set to be approximately the same as the depth dimension of the first storage recess 531.

  Examples of the first amorphous foil material 81 include cobalt-based amorphous (Co—Fe—Ni—B—Si). The amorphous foil material 81 is, for example, cobalt-based amorphous (Co—Fe—Ni—B—Si) and has a relative magnetic permeability of 20000. On the other hand, for example, when stainless steel is used as the back cover 130, the relative permeability is 1.4, when the brass is used, the relative permeability is 1.0, and when the titanium is used, the relative permeability is 1. .0001. Therefore, the magnetic permeability of the amorphous foil material 81 is much larger than that of the metal constituting the back cover 130, so that the surrounding magnetic flux lines are collected in the amorphous foil material 81 and the magnetic field becomes stronger. Furthermore, since the amorphous foil material 81 is disposed closer to the dial plate 14 than the lead portion 211D, it is easy to pick up radio waves from the dial 14 side. As a result, the number of magnetic flux lines passing through the magnetic core 211 from the lead portion 211D facing the amorphous foil material 81 increases, and the magnetic flux density increases.

  In FIG. 2, the train wheel bridge 44 is provided so as to cover the train wheel 43, and has a pair of extending portions 441 and 442 (drop-off preventing portions) respectively extending in the 11 o'clock direction and the 7 o'clock direction. . The extending portions 441 and 442 are provided so as to cover at least a part of the first amorphous foil material 81. That is, as shown in FIG. 6, the train wheel bridge 44 extends to a position that overlaps at least a part of the first storage recess 531, and holds the amorphous foil material 81 between the ground plate 50 and the first. The amorphous foil material 81 is prevented from falling off from the storage recess 531 of the storage space.

In addition, a coil recess 55 is formed on the surface of the ground plane main body 51 of the ground plane 50 that faces the coil 212. By storing a part of the front side of the coil 212 in the concave part 55 for the coil, the front side surface of the lead part 211D and the back side surface of the main plate main body 51 come into contact, and the antenna 21 is positioned in the thickness direction. Yes.
Furthermore, the leading end portion of the lead portion 211D is provided so as to cover a part of the first amorphous foil material 81, and the first amorphous foil material 81 is sandwiched between the ground plate 50 and the first storage recess 531. The falling-off prevention part of the present invention that prevents the amorphous foil material 81 from falling off is configured.

FIG. 7 is a partially enlarged view of FIG. 3, and is a side sectional view showing a state in which an amorphous foil material 82 as a second magnetic member is fixed to the ground plane 50. In FIG. 7, the back cover side of the module 10 is shown as the upper side.
As shown in FIG. 7, in the 9 o'clock direction (FIG. 2) of the base plate 50, a protruding portion 52 that protrudes toward the back cover (upward in the drawing) is formed on the outer peripheral side of the coil 212. The protruding portion 52 is interposed between the coil 212 and the trunk portion while being housed in the outer case. The protrusion 52 is formed with a second housing recess 532 having an opening on the back cover side.

In FIG. 7, the second storage recess 532 is formed so that its cross-sectional shape is long and slit-shaped in the thickness direction of the watch. Further, as shown in FIG. 2, the second storage recess 532 is formed in an arc shape along the inner peripheral surface of the casing 110 in a plan view. A second amorphous foil material 82 is stored in the second storage recess 532.
The second amorphous foil material 82 is, for example, cobalt-based amorphous (Co—Fe—Ni—B—Si) as in the case of the first amorphous foil material 81 described above. Accordingly, the magnetic permeability of the amorphous foil material 82 is much larger than that of the metal constituting the casing 110, so that the induced magnetic flux lines easily pass through the amorphous foil material 82.
In addition, the amorphous foil material 82 has a lower conductivity than the metal constituting the casing 110, and the magnetic flux lines pass through the amorphous foil material 82, so that the vortex is smaller than when the magnetic flux lines pass through the casing 110. Generation of current can be suppressed.

  Here, the opening of the second storage recess 532 is provided with a crimping portion 54 in which at least a part of the opening is crimped. Specifically, a dowel for caulking or the like is formed in the second storage recess 532 in advance, and when the second amorphous foil material 82 is stored, the dowel or the like may be caulked. As the caulking portion 54, for example, heat caulking or the like can be adopted. Since this caulking part 54 constitutes a drop-off preventing part of the present invention and covers a part of the second storage recess 532, the second amorphous foil material 82 can be prevented from dropping off.

[Effects of this embodiment]
According to this embodiment, the following effects can be achieved.
(1) The first amorphous foil material 81 is housed in the first housing recess 531 formed in the ground plane 50, and does not fall off from the first housing recess 531 by the extending portions 441 and 442 and the lead portion 211D. It is provided as follows. Therefore, compared to the case where the amorphous foil material 80 is bonded to the end of the core case as in the prior art, there is no bonding work for fixing the amorphous foil material 81 by bonding, so that the antenna 21 can be assembled or replaced. The workability of the removal work can be improved. Further, when the amorphous foil material 81 is positioned, positioning can be performed simply by storing the amorphous foil material 81 in the first storage recess 531 formed in advance on the base plate 50, which facilitates assembly and increases reproducibility. Moreover, since there is no operation | work which takes in the antenna 21 in the exterior case 100 in the state which adhered the amorphous foil material 81, it can prevent that the amorphous foil material 81 is damaged during an assembly operation.
Further, since the amorphous foil material 81 is housed in the housing recess 531 and is fixed to the ground plane 50 by the extending portions 441 and 442 and the lead portion 211D, the amorphous foil material 81 having a simple shape can be used. Compared with the case where the amorphous foil material 81 is processed into a U-shape as in the prior art, the processing of the amorphous foil material 81 is easy, and an increase in manufacturing cost can be suppressed. In addition, as compared with the conventional case where the amorphous foil material 81 projects from the end of the core case and is bonded to the end of the core case, the amorphous foil material 81 is prevented from being damaged by an external impact. This eliminates the need for reinforcing measures for preventing damage due to stress or the like.
Therefore, when the amorphous foil material 81 is disposed in the outer case 100, a complicated structure of the amorphous foil material 81 and unstable assembly elements such as adhesion are not required, and the amorphous foil material 81 can be easily placed in the outer case 100. Since it is possible to reduce the number of manufacturing steps and prevent damage to the amorphous foil material 81 due to external impact, the quality of the antenna 21 such as reception sensitivity can be stabilized.

(2) In addition, the second amorphous foil material 82 is stored in the second storage recess 532 formed in the ground plane 50 and provided so as not to fall off from the second storage recess 532 by the caulking portion 54. Yes. Therefore, the same effect as that of the first amorphous foil material 81 can be obtained, and when the amorphous foil material 82 is arranged in the outer case 100, a complicated structure of the amorphous foil material 82 or an unstable assembly element such as adhesion is obtained. Since the amorphous foil material 82 can be easily incorporated and removed from the outer case 100, the number of manufacturing steps can be reduced, and the amorphous foil material 82 can be prevented from being damaged by an external impact. The quality such as the 21 reception sensitivity can be stabilized.

(3) Since the amorphous foil material 81 is provided at a position closest to the lead portion 211D on the back surface of the ground plane 50, the magnetic flux lines collected by the amorphous foil material 81 are connected to the antenna via the magnetic core 211. The reception performance at the antenna 21 is improved. At this time, since the amorphous foil material 81 is not provided in the coil facing region 50 </ b> A, the magnetic flux lines can be effectively collected in the lead portions 211 </ b> D at both ends of the magnetic core 211, and from one end of the magnetic core 211. A magnetic path extending to the other end can be easily formed. Thereby, the receiving performance of the antenna 21 can be further improved.

(4) The amorphous foil material 81 in the first storage recess 531 is sandwiched between the extending portions 441 and 442 of the train wheel bridge 44 and the ground plane 50, and the lead portion 211D and the ground plane 50 of the magnetic core 211 Therefore, the amorphous foil material 81 can be reliably fixed to the ground plane 50 without using a fixing means such as adhesion, and the lead portion 211D and the magnetic member can be easily arranged close to each other. At this time, the train wheel bridge 44 is extended so that the train wheel bridge 44 is configured as a drop-off prevention unit, so that a new member does not have to be used as the drop-off prevention unit. Will also be easier.

(5) A slit-like second storage recess 532 is provided in the protrusion 52 that is formed on the outer peripheral side of the coil 212 in the base plate 50 and protrudes toward the back cover 130, and the amorphous foil material 82 is provided in the storage recess 532. Is contained, the induced magnetic flux lines easily pass through the amorphous foil material 82 disposed on the outer peripheral side of the antenna 21, and even if the magnetic flux lines pass through the inside, almost no eddy current is generated. Does not occur. Therefore, almost no eddy current loss due to the passage of magnetic flux lines through the casing 110 occurs, and the antenna characteristic degradation of the antenna 21 can be efficiently suppressed.

(6) Since the protrusion 52 is formed so as to partially protrude from the ground plane 50 toward the back cover 130, the protrusion 52 can be formed by slightly changing the shape of the conventional ground plane. At the same time, by providing the second housing recess 532 in the projecting portion 52, the amorphous foil material 82 can be arranged close to the coil 212. That is, the magnetic flux lines have a characteristic that the density of the magnetic flux lines decreases as the distance from the antenna 21 decreases. For example, the amorphous foil material 82 is more than the case where the amorphous foil material 82 is disposed on the inner peripheral surface of the casing 110. Is close to the antenna 21, and many magnetic flux lines pass through the amorphous foil material 82, and the above-described deterioration of the antenna characteristics of the antenna 21 can be efficiently suppressed.

(7) Since the amorphous foil material 82 in the second storage recess 532 is fixed by the crimping portion 54 formed in the opening of the storage recess 532, the amorphous foil material 82 can be used without using a fixing means such as adhesion. Can be securely fixed to the main plate 50. At this time, since a new member does not have to be used as the drop-off preventing portion, the number of parts is not increased, and a simple structure can be achieved.

[Modification of the present invention]
It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  For example, although the amorphous metal foil-shaped member which is a ferromagnetic member was used as a magnetic member, it is not limited to this. For example, the metal is not particularly limited as long as it has a permeability higher than that of the back cover or casing, and may be appropriately selected depending on the metal material constituting the back cover or casing.

In addition, in the said embodiment, although the pair of amorphous foil material has shown the case where each is comprised with one amorphous foil material, as an amorphous foil material, it is comprised by laminating | stacking several amorphous foil materials. May be.
In this way, the thickness dimension of the amorphous foil material (metal magnetic foil material) is increased, and the magnetic flux collecting effect can be further enhanced, so that the receiving sensitivity of the antenna can be improved. In addition, the distance between the magnetic core lead portion and the magnetic member can be made closer, and more magnetic flux lines can be passed through the magnetic member, so that eddy current loss occurs when the magnetic flux lines pass through the body portion. Can be further suppressed, and the deterioration of the antenna characteristics of the antenna can be more efficiently suppressed.

  In addition, the slit-shaped second storage recess 532 is formed to open on the back cover side of the main plate 50, but may be formed to open on the dial 14 side of the main plate 50. In this case, The dial 14 or the like can be used as a drop-off prevention unit.

  In the embodiment, as the amorphous foil material 80 that is the magnetic member of the present invention, the pair of first amorphous foil materials 81 disposed on both ends of the antenna 21 and the second disposed on the outer peripheral side of the coil 212. Although the amorphous foil material 82 has been described, the electronic timepiece with built-in antenna of the present invention may be provided with either the first amorphous foil material 81 or the second amorphous foil material 82. In addition, the magnetic member of the present invention is not limited to the first amorphous foil material 81 or the second amorphous foil material 82 as long as it is provided in the vicinity of the antenna.

Further, the housing concave portion 531 of the first amorphous foil material 81 may be provided with a caulking portion to prevent the amorphous foil material 81 from falling off.
In the above embodiment, the extension portions 441, 442, the lead portion 221D, and the caulking portion 54 are exemplified as the drop-off prevention portion. You may use the member provided in.

  In addition, the specific structure and procedure for carrying out the present invention can be changed as appropriate to other structures and the like within the scope of achieving the object of the present invention.

1 is a front view of a radio-controlled timepiece that is an electronic timepiece with a built-in antenna according to an embodiment of the present invention. The top view which looked at the inside of the electric wave correction timepiece of the said embodiment from the back cover side. The sectional side view at the time of cut in the thickness direction of the radio wave correction timepiece of the embodiment. The block diagram which shows schematic structure of the electromagnetic wave correction timepiece of the said embodiment. The block diagram which shows the structure of the receiving circuit part of the electromagnetic wave correction timepiece of the said embodiment. The sectional side view which shows the state by which the 1st magnetic member of the said embodiment was fixed. The sectional side view which shows the state by which the 2nd magnetic member of the said embodiment was fixed.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece (Electronic timepiece with a built-in antenna), 10 ... Module, 20 ... Receiving means, 21 ... Antenna, 50 ... Ground plane, 50A ... Coil facing area, 50B ... Lead part facing area, 52 ... Projection part, 53 ... Storage recessed part , 54 ... caulking part (falling prevention part), 80 ... amorphous foil material (magnetic member), 100 ... exterior case, 110 ... casing (body part), 130 ... back cover, 211 ... magnetic body core, 211C ... coil winding part , 211D... Lead part (drop-off prevention part), 212... Coil, 441, 442.

Claims (5)

An electronic timepiece with a built-in antenna comprising an outer case and a module housed in the outer case,
The module includes a non-conductive ground plane, an antenna that receives external wireless information, a receiving unit that processes the external wireless information received by the antenna, a magnetic member provided in the vicinity of the antenna, and the magnetic member A drop-off prevention part for preventing the drop-out of
The magnetic member is housed in a housing recess formed in the base plate,
The drop-off prevention part is provided so as to cover at least a part of the storage recess,
The antenna has a longitudinal magnetic core and a coil,
The magnetic core has a coil winding portion around which the coil is wound, and a pair of lead portions protruding to both end sides of the coil winding portion,
The storage recess is a position that does not overlap the coil facing area facing the coil on the back surface opposite to the display side of the ground plane, and a position that overlaps at least a part of the lead facing area facing the lead section. Provided in
A non-conductive wheel train bearing that is disposed opposite to the back side surface of the main plate and bearings the train wheel;
The train wheel bridge has an extending portion that extends to a position that overlaps at least a part of the storage recess,
The storage recess has a depth dimension similar to the thickness dimension of the magnetic member,
The dropout prevention part is constituted by the extending part that sandwiches the magnetic member with the base plate, and is a built-in antenna type electronic timepiece. The electronic watch with a built-in antenna according to claim 1 ,
The storage recess has a depth dimension similar to the thickness dimension of the magnetic member,
The dropout prevention part is constituted by the lead part that sandwiches the magnetic member with the base plate, and is a built-in antenna type electronic timepiece. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 2 ,
The electronic timepiece with built-in antenna, wherein the drop-off prevention portion is a crimped portion in which at least a part of the opening of the storage recess is crimped. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 3 ,
2. The antenna built-in electronic timepiece, wherein the magnetic member is formed by laminating two or more metal magnetic foils. In the electronic timepiece with a built-in antenna according to any one of claims 1 to 4 ,
The electronic timepiece with a built-in antenna, wherein the magnetic member is made of an amorphous metal.

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