JP5034347B2 - Electronic clock - Google Patents

Description

  The present invention relates to an electronic timepiece having an antenna disposed on a ground plane.

Conventionally, a radio timepiece is known as an electronic timepiece with a built-in antenna (for example, see Patent Document 1). This type of radio-controlled timepiece has an antenna core in which an amorphous metal foil is laminated on a core frame made of an insulating base material. The antenna core has an antenna wound with a coil, and the antenna is fixed to a ground plane. Is known (see, for example, Patent Document 2).
JP 2005-308649 A JP 2005-265882 A

However, in the conventional configuration, an amorphous core that is weak against impact is applied to the antenna core, and when the watch is impacted by dropping or the like, the amorphous core may come into contact with the ground plane and the magnetic characteristics may deteriorate. . In order to improve the impact resistance of the antenna core, when the antenna core is covered with a resin frame, the antenna is enlarged, which is not desirable for an electronic timepiece that requires a reduction in size.
The present invention has been made in view of the above-described circumstances, and an object thereof is to provide an electronic timepiece including a small and highly reliable antenna.

In order to solve the above-mentioned problems, the present invention provides an electronic timepiece in which an antenna is disposed on a ground plane, wherein the antenna is formed of an insulating material and includes a core frame that fixes an antenna core laminated with a magnetic sheet to the ground plane side . The core frame includes a flat plate portion on which a coil is wound around an outer periphery including the antenna core, and a concave portion having a concave cross section that is provided at both ends of the flat plate portion and accommodates a part of the antenna core. is disposed at a position spaced a gap between the base plate as well as close to the ground plane from the antenna core which is accommodated in the concave portion, in contact with the base plate when flexed core frame by the impact By restricting the contact of the antenna core to the ground plane , an impact on the antenna core is avoided.
According to the present invention, it is possible to avoid an impact on the antenna core without covering the antenna core with a resin frame or the like, and it is possible to reduce the size while maintaining reliability. In addition, since the portion where the coil is wound around the outer periphery including the antenna core is a flat plate portion, the winding of the coil can be reduced, and the antenna unit can be downsized accordingly.

Moreover, the said structure WHEREIN: It is preferable that the said recessed part is located in the edge part vicinity of the said coil. Further, in the above configuration, the outer periphery including the antenna core of the flat portion of the core frame is covered with an insulating film for ensuring insulation between the antenna core and the coil. It is preferable that the coil is wound around. According to this configuration, the insulation between the antenna core and the coil is ensured by the insulating film.

  In the above configuration, a printed circuit board is disposed on a surface opposite to the antenna core at an end including the concave portion in the core frame, and the coil and the receiving circuit are electrically connected via the printed circuit board. It is preferable to be connected to. According to this configuration, the coil and the receiving circuit can be easily conductively connected by the printed board.

  In the above configuration, it is preferable that the core frame is configured such that a surface on which the coil is wound is closer to the antenna core than a surface on which the printed board is disposed. According to this configuration, the coil can be brought close to the antenna core, and the printed circuit board and the antenna core can be arranged apart from each other, and the magnetic field generated in the antenna core when receiving the longwave standard radio wave and the reception flowing through the printed circuit board. Interference with the signal is reduced, and a decrease in reception efficiency can be avoided.

  Moreover, the said structure WHEREIN: It is preferable that the hole for screw-fixing the said antenna to the said ground plate is formed in the edge part of the said core frame. According to this structure, an antenna can be reliably fixed to a ground plane with a screw.

This onset Ming, without covering the A Ntenakoa like resin frame, it is possible to avoid a shock to the antenna core, it is possible to reduce the curling of the coil can be secured compact and reliable.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing an electrical configuration of a wristwatch-type solar rechargeable radio timepiece (hereinafter referred to as a wristwatch) according to the present invention. The wristwatch 1 includes an analog timepiece mechanism portion 1B having a gear train mechanism and a motor for driving the time display indicator 1A, a motor drive circuit 1C for driving the motor of the analog timepiece mechanism portion 1B, and a control for controlling the entire wristwatch 1. A circuit 1D and a power source 1E that supplies power to each part of the wristwatch 1 are provided.
The wristwatch 1 also includes an antenna 1F that receives a long-wave standard radio wave (Japan JJY: 40 kHz / 60 kHz, US WWVB: 60 kHz, German DCF77: 77.5 kHz), a receiving circuit 1G, and a data storage circuit 1H. Under the control of the control circuit 1D, the long wave standard radio wave is received via the antenna 1F, and the time code indicating the current time information is decoded from the received long wave standard radio wave and stored in the data storage circuit 1H.

The control circuit 1D is connected to a hand position detection circuit 1I for detecting the position of the time display indicator 1A and a power generator 1J. When the control circuit 1D receives a long wave standard radio wave, the hand position detection circuit The deviation amount of the time display indicator 1A with respect to the time code decoded from the detection result of 1I is specified, the motor is driven by the motor drive circuit 1C so as to correct this deviation amount, and the electric power generated by the power generator 1J is supplied to the power source 1E. To charge. The power generation device 1J has a function of outputting a power generation detection signal S1 to the control circuit 1D, and the control circuit 1D performs power save control for stopping the hand movement when there is no power generation based on the power generation detection signal S1. Further, when the voltage of the power supply 1E reaches a predetermined voltage or higher, the control circuit 1D outputs a control signal S2 for preventing overcharge to the power generator 1J, and controls to limit the power supply 1E so that it is not charged any more. Do.
The external operation member 1K is for inputting a user instruction to the control circuit 1D. For example, when the external operation member 1K is operated, the control circuit 1D receives the long wave standard radio wave and corrects the time. Execute time correction processing.

FIG. 2 is a diagram showing an appearance of a timepiece according to one embodiment of the wristwatch 1, and FIG. 3 is a diagram showing an outline of a cross-sectional structure thereof.
The wristwatch 1 includes a watch case 2 and a pair of bands (bands) 3 connected to the watch case 2. The watch case 2 is formed of a metal material such as stainless steel or titanium, or a resin material such as plastic, and has a through hole 2A (see FIG. 3 ) therein. In the through-hole 2A of the timepiece case 2, the dial 10, the solar panel 20 constituting the power generation device 1J, the analog timepiece mechanism 1B, and the movement (movement for electronic timepiece) 30 constituting the various circuits described above are arranged in order from the timepiece side. Are stacked.
Also arranged on the dial 10 is a time display indicator 1A composed of a second hand 5, a minute hand 6 and an hour hand 7 respectively connected to pipes 21, 22, 23 extending from the second wheel, second wheel and hour wheel of the movement 30. Then, the clock face side of the through-hole 2A is sealed with the cover glass 40, and the back side is sealed with the back cover 41. Packings 42 and 43 are arranged between the cover glass 40 and the watch case 2 and between the back cover 41 and the watch case 2, respectively, and the sealing performance in the watch case 2 is secured. Further, a crown 8 and an operation button 9 that functions as the external operation member 1K are provided outside the watch case 2.

  The dial 10 of the wristwatch 1 is made of a light-transmitting material, and the solar panel 20 is irradiated with light such as sunlight that has passed through the cover glass 40 and the dial 10 to generate power. The generated power is charged in the secondary battery 38 (see FIG. 4) constituting the power source 1E. Then, the movement 30 is driven by the power of the secondary battery 38 to display the current time. The secondary battery 38 is a chemical secondary battery such as a button-type capacitor or a lithium ion secondary battery.

FIG. 4 is a plan view of the movement 30 as viewed from the back cover 41 side, and FIG. 5 is a plan view showing a state where the circuit board 50 and the circuit pressing plate 51 are removed from the movement 30. The movement 30 includes a substantially disc-shaped ground plate 31 that serves as a base material of the movement 30. The main plate 31 includes a gear train mechanism (including a second wheel, a second wheel, and an hour wheel) 35 for rotating the time display pointer 1A (second hand 5, minute hand 6 and hour hand 7) and two motors 36A. 36B, an antenna unit 37 constituting the antenna 1F, a secondary battery 38 constituting a power source, and the like are disposed. 4 and 5, reference numeral 8 </ b> A is a winding stem that extends from the 3 o'clock position of the movement 30 and has the crown 8 connected to the tip thereof.
In addition, although the resin ground plate is applied to the ground plate 31 of this embodiment so that reception of radio waves is not hindered, a ground plate made of other materials such as metal is applied within a range that satisfies the reception performance. May be.

The component layout of the main plate 31 will be described in detail. As shown in FIG. 5, the main plate 31 is provided with a gear train mechanism 35 in the central region, and an annular empty region SC is formed on the outer side surrounding the gear train mechanism 35. Secured. In this empty area SC, two motors 36A, 36B, an antenna unit 37, a secondary battery 38, and the like are arranged.
More specifically, the annular empty area SC includes a first area (approximately 0 o'clock to 3 o'clock area) AR1, a second area (approximately 3 o'clock to 6 o'clock area) AR2, and a third area (approximately 6 o'clock). -10 o'clock region) AR3 and fourth region (approximately 10 o'clock -12 o'clock (0 o'clock) region) AR4. One motor 36A is arranged in the first region AR1, and the second region The other motor 36B is arranged in AR2, the antenna unit 37 is arranged in the third area AR3, and the secondary battery 38 is arranged in the fourth area AR4. As a result, relatively large four parts (two motors 36A and 36B, antenna unit 37, and secondary battery 38) are arranged in a well-balanced manner in a limited plane space of the ground plane 31 without overlapping one above the other.

One end of each gear shaft of the gear train mechanism 35 is supported by the main plate 31 and the other end is supported by a train wheel receiver 45 provided on the back cover 41 side of the main plate 31. The train wheel mechanism 35 includes a train wheel mechanism for the hour hand 7 and the minute hand 6, and a train wheel mechanism for the second hand 5, and one train wheel mechanism is driven by a motor 36A and the other train wheel mechanism. Is driven by a motor 36B. That is, one of the two motors 36A and 36B functions as an hour / minute motor that drives the hour hand 7 and the minute hand 6, and the other functions as a second hand motor that drives the second hand 5.
In this wristwatch 1, by adopting a two-motor type capable of independently driving the hour hand 7 and the minute hand 6 and the second hand 5, the time is adjusted according to the time code included in the long wave standard radio wave received by the antenna unit 37. As compared with the case where the second hand 5, the minute hand 6 and the hour hand 7 are driven by one motor, the amount of motor driving at the time adjustment can be reduced, and the time adjustment can be shortened and the power consumption can be reduced. .

  Note that the movement 30 of the present embodiment is a movement that is further downsized than the conventional solar rechargeable radio timepiece movement for the purpose of a ladies watch, and adopts a two-motor type, but is not limited thereto. Instead, a single motor type in which all the display hands are driven by a single motor may be adopted. Further, when the movement 30 is used for a male watch, or is made relatively large in terms of design, it is possible to easily arrange three or four or more motors as the main plate 31 becomes larger. Is possible.

As shown in FIG. 4, the movement 30 is provided with a circuit board 50 on the back cover 41 side of the base plate 31 with a gap between the wheel train receivers 45. The plate 51 is fixed to the main plate 31.
FIG. 6 is a plan view of the circuit board 50 on the clock face side (that is, the base plate 31 side), and FIG. 7 is a plan view of the opposite side (back cover 41 side). The circuit board 50 is formed in a substantially disk shape that covers substantially the entire surface of the ground plane 31 (movement 30). The circuit board 50 has a window portion 50A in a region corresponding to a portion (second wheel, second wheel, shaft portion of the hour wheel) protruding to the back cover 41 side of the train wheel mechanism 35 and a coil portion of the motors 36A and 36B. , 50B and 50C are formed, and while avoiding interference with these, the circuit board 50 is disposed close to the base plate 31 side to prevent the movement thickness from increasing.

  The circuit board 50 has a microcomputer 56, a crystal oscillator 57, and a hand position detection mechanism that form various circuits including a receiving IC 55 that constitutes the receiving circuit 1G and a control circuit 1D on the surface of the timepiece side (the base plate 31 side). Electronic components such as (not shown) are mounted, and these electronic components are electrically connected to the antenna unit 37, the solar panel 20, the motors 36A and 36B, and the secondary battery 38, thereby this circuit board. 50 constitutes a circuit unit for controlling the entire wristwatch 1.

  The reception IC 55 is wired to the microcomputer 56, receives a long wave standard radio wave via the antenna unit 37 under the control of the microcomputer 56, and decodes a time code indicating current time information from the received long wave standard radio wave. As is well known, the time code includes minute information indicating the current minute, hour information indicating the current time, and date information indicating the current date (the total date from January 1 of the year). Is output from the receiving IC 55 to the microcomputer 56.

The microcomputer 56 centrally controls each part of the wristwatch 1 and has various circuits such as an oscillation circuit for oscillating the CPU, the ROM, the RAM, and the crystal resonator 57, and controls the drive of the motors 36A and 36B. Various processes such as reception control and time adjustment of the long wave standard radio wave, control for charging the secondary battery 38 with the generated power of the solar panel 20, and power supply control for supplying the power stored in the secondary battery 38 to each unit are performed.
In this configuration, since the circuit board 50 covers substantially the entire surface of the ground plane 31 (movement 30) including the antenna unit 37, a large area of the circuit board 50 can be secured, and a large arrangement area for electronic components and wirings can be secured. Can do.
In addition, the area ARC that overlaps the antenna unit 37 of the circuit board 50 is only a wiring pattern, and the mounting thickness is not provided in this area ARC, thereby preventing an increase in the thickness of the movement 30. Further, a check terminal TC (plus terminal TA, minus terminal TB) for electrical characteristic inspection is provided on the surface of the circuit board 50 on the back cover 41 side (see FIG. 7).

Further, as shown in FIG. 6, the operation detection contact 60 electrically connected to a predetermined terminal of the microcomputer 56 by pattern wiring and various types of microcomputers 56 are provided on the side surface portion of the circuit board 50 having this configuration. A positive-side power contact 70 is provided that is electrically connected to the power input terminal of the electronic component by pattern wiring.
The operation detection contact 60 is provided at a position corresponding to the operation button 9 (corresponding to the 4 o'clock position). When the movement 30 is assembled, the operation detection contact 60 is located outside the operation detection contact 60 (on the outer peripheral side of the circuit board 50). The contact spring portion 65 (see FIG. 4) provided on the circuit pressing plate 51 is disposed apart. When the movement 30 is incorporated in the watch case 2, the tip of the operation button 9 comes into contact with the contact spring portion 65, and when the operation button 9 is pressed, the contact spring portion 65 is bent and the operation detection contact 60. This contact is detected by the microcomputer 56 as a user operation.

  Further, as shown in FIG. 4, the positive-side power source contact 70 has a pressure contact spring portion (pressure contact member) integrally provided on a positive lead plate 90 electrically connected to the positive electrode of the secondary battery 38. 93 is in pressure contact, whereby the secondary battery 38 and the circuit board 50 are conductively connected.

Next, the antenna unit 37 will be described in detail.
8 is a perspective view showing the antenna unit 37, and FIG. 9 is a perspective view of the antenna unit 37 as seen from the back side. The antenna unit 37 includes a core frame 210, an antenna core 220 disposed on the core frame 210, a coil 230 wound around the outer periphery of the antenna core 220 including the core frame 210, and an antenna for antenna disposed on the core frame 210. Circuit board (printed circuit board) 240.

FIG. 10 is a perspective view showing the core frame 210. The core frame 210 is made of an insulating material such as a synthetic resin such as a liquid crystal polymer, and includes a flat plate portion 211 extending linearly and a pair of curved portions (end portions) 212 formed at both ends of the flat plate portion 211. 213.
As shown in the figure, the pair of bent portions 212 and 213 are bent in a substantially arc shape along the outer shape of the main plate 31 (see FIG. 5), and each bent portion 212 and 213 is a coil. 230 is integrally provided with concave portions 212A and 213A having a concave section in the vicinity of the end portion, and the surface X located between the concave portions of the concave portions 212A and 213A is the same height as the surface of the flat plate portion 211 on the ground plate 31 side. Is formed.
In addition, the bent portions 212 and 213 include thick plate portions 212B and 213B extending outward at the same height as the ground plate 31 side surface (including the surface X) of the flat plate portion 211, and the thick plate portions 212B and 213B. It extends and integrally has thin plate portions 212C and 213C in which a screw fixing hole 214 is formed.

  The antenna core 200 is an amorphous core formed by laminating a plurality of amorphous metal thin plates (magnetic sheets) mainly composed of Co. For example, about 30 to 40 amorphous metal thin plates having a thickness of about 10 μm are laminated. ing. The amorphous metal thin plates are bonded to each other with an adhesive, and are disposed on the flat plate portion 211 and the thick plate portions 212B and 213B of the curved portions 212 and 213 (see FIG. 9). Is done.

  As shown in FIG. 11, the portion including the flat plate portion 211 of the antenna core 200 is covered with an insulating film 250, and the coil 230 is wound on the insulating film 250. Thereby, the insulation between the antenna core 200 and the coil 230 is ensured by the insulating film 250. The wire diameter and the number of turns of the coil 230 are set in consideration of the material of the coil 230, the reception sensitivity of the antenna, and the like. Note that the surface of the coil 230 is coated with an adhesive in advance, and the coils 230 are bonded to each other by winding the coil 230 while applying hot air with a heater.

In this configuration, the concave portions 212A and 213A of the core frame 210 are formed with flange portions 212F and 213F protruding beyond the thickness of the coil 230 on both side portions of the coil 230, as shown in FIGS. The plane portions other than the flange portions 212F and 213F (hereinafter referred to as the plane portions 212H) are formed lower than the flange portions 212F and 213F and at the same height. For this reason, the coil 230 is blocked by the flange portions 212 </ b> F and 213 </ b> F protruding beyond the thickness of the coil 230 and is not wound around the bent portions 212 and 213.
Moreover, when the antenna core 200 is fixed to the ground plane 31 on the side surfaces (side surfaces of the concave portions 212A and 213A) in the vicinity of both side portions of the coil 230 of the core frame 210, as shown in FIGS. A pair of left and right locking claws 216 that are locked to each other are integrally provided.

  As shown in FIG. 8, the antenna circuit board 240 has an antenna circuit board placement surface 260 that is a surface on the opposite side (circuit board 50 side) of the antenna core 200 in the concave portion 213 </ b> A and the thick plate portion 213 </ b> B of the core frame 210. Is arranged. A flexible printed circuit board made of an insulating material is applied to the antenna circuit board 240, and the coil 230 is connected to the antenna circuit board 240 by soldering or welding so as to adjust the tuning frequency of the antenna unit 37. Capacitors 240A and 240B are mounted as electrical elements. The antenna circuit board 240 has a hole portion 241 communicating with the hole portion 214 of the thin plate portion 213C, and a conductive pattern 242 for conductively connecting to the circuit board 50 is provided around the hole portion 241. Yes.

FIG. 12 is a cross-sectional view showing a state where the antenna unit 37 is mounted on the ground plane 31. The antenna circuit board placement surface 260 formed on the core frame 210 includes a surface 261 on which the antenna circuit board 240 is placed in contact with an adhesive or the like, and this surface 261 is an insulating property described later on the core frame 210. It is formed on a surface that is separated from the surface 251 of the flat plate portion 211 on which the coil 230 is wound via the film 250 by a distance α on the opposite side to the antenna core 200.
In other words, in the core frame 210, the surface 251 on the opposite side of the antenna core 200 in the flat plate portion 211 around which the coil 230 is wound is a surface close to the antenna core 200 and the surface on which the antenna circuit board 240 is disposed. 261 is formed on a surface away from the antenna core 200.
Thus, by bringing the surface 251 of the flat plate portion 211 around which the coil 230 is wound close to the antenna core 200, the surface 261 on which the coil 230 can be brought close to the antenna core 200 and the antenna circuit board 240 is disposed is provided. The antenna circuit board 240 is separated from the antenna core 200 by a distance α from the surface 251 of the flat plate portion 211, so that the antenna circuit board 240 and the antenna core 200 are too close to each other. It is possible to avoid a situation in which interference occurs with the received signal flowing through the terminal and the reception performance deteriorates. Specifically, when receiving a long-wave standard radio wave, it is desirable that the conductive pattern of the antenna circuit board 240 be separated from the antenna core 200 by a distance of 0.1 mm or more.

  As shown in FIG. 12, the antenna unit 37 includes a pipe member (so-called screw pin) 31P in which holes 214 provided in curved portions 212 and 213 at both ends of the core frame 210 are spaced from the base plate 31. , 31P1, and fixed to the base plate 31 by fastening the screws 31N, 31N1. The pipe member 31P1 is disposed at approximately 6 o'clock in the vicinity of the motor 36B, as shown in FIG.

More specifically, one pipe member 31P is provided in the vicinity of the secondary battery 38 on the outer peripheral edge of the base plate 31 (see FIG. 5), and the pipe member 31P has a positive lead as shown in FIG. The plate 90, the hole 214 provided in one bent portion 212 of the antenna unit 37, the negative lead plate 80 welded to the secondary battery 38, the circuit board 50, and the circuit pressing plate 51 are inserted in order. Then, the screw 31N is fastened to the pipe member 31P from above, whereby the component group inserted through the pipe member 31P is screwed to the base plate 31. A screw 31n for fixing predetermined components of the movement 30 to the main plate 31 is also fastened below the pipe member 31P.
In this case, since the core frame 210 of the antenna unit 37 is interposed between the negative lead plate 80 and the positive lead plate 90, the core frame 210 formed of an insulating material is connected to the negative lead plate 80 and the positive lead plate 90. As a result, the movement thickness can be reduced as compared with the case where an insulating member is separately provided.

The other pipe member 31P1 is provided in the vicinity of the motor 36B on the outer periphery of the base plate 31 (see FIG. 5), and the pipe member 31P has the other curved portion 213 of the antenna unit 37 as shown in FIG. The hole 214 provided in the circuit board 50, the circuit board 50, and the circuit pressing plate 51 are inserted in order, and a screw 31N1 is fastened to the pipe member 31P1 from above, so that a group of components inserted into the pipe member 31P1 is formed. Screwed to the main plate 31. A screw 31n1 for fastening other components of the movement 30 to the main plate 31 is fastened below the pipe member 31P1.
In this case, since the antenna circuit board 240 is disposed in the bent portion 213 of the antenna unit 37 (see FIG. 8), the circuit board 50 is overlaid on the bent portion 213, so The conductive pattern 242 on the circuit board 240 and the circuit board 50 can be electrically connected, and the coil 230 and the receiving IC 55 can be easily electrically connected via the antenna circuit board 240.

  In this way, the antenna unit 37 is supported at both ends by the ground plane 31. In this supported state, a gap SK is formed between the antenna core 220 and the ground plane 31 as shown in FIG. The supporting structure is not directly transmitted to the antenna core 200. In addition, since a part of the coil 230 of the antenna unit 37 is inserted into the opening 31K formed in advance in the ground plane 31, the antenna unit 37 can be disposed close to the ground plane 31. Thinning can be achieved.

FIG. 13A is a cross-sectional view showing a cross-section (a-a cross-section in FIG. 9) of the flange portion 212F of the core frame 210 together with the peripheral configuration, and FIG. 13B is a concave portion 212A excluding the flange portion 212F. FIG. 10 is a cross-sectional view showing a cross-section (b-b cross-section in FIG. 9) together with a peripheral configuration.
In this configuration, as shown in FIG. 13A, the ground plane 31 is provided with a locking portion 31 </ b> L for locking a pair of locking claws 216 provided on the antenna unit 37. Is locked to the locking portion 31L. That is, the antenna unit 37 has its both end portions (screw fixing portions) and the vicinity of the coil 230 (locking claw 216 portion) positioned substantially at the center fixed to the ground plate 31, and the antenna unit 37 is securely fixed to the ground plate 31. can do.

Further, the antenna unit 37 of this configuration has a gap formed between the ground plane 31 and the core frame 210 except for the engaging claws 216 and both end portions (screw fixing portions) of the core frame 210, and FIG. B), the flat surface portion 212H of the concave portion 212A of the core frame 210 is positioned closer to the ground plane 31 than the antenna core 220, and the value S (that is, the smallest gap between the planar portion 212H and the ground plane 31) (that is, S <SK (gap between the antenna core 220 and the ground plane 31)). As described above, since the flat portion 212H having the same height as the flat portion 212H of the concave portion 212A is also provided in the concave portion 213A of the core frame 210, the flat portion 212H in the concave portion 213A, the ground plane 31 and The gap between them is also the value S.
Therefore, in the present embodiment, the antenna unit 37 is fixed to the ground plane 31 with the four planar portions 212H provided in the concave portions 212A and 212B of the core frame 210 spaced apart from each other in the front-rear and left-right directions closest to the ground plane 31. The Rukoto.
For this reason, when the core frame 210 is bent due to a relatively large impact due to dropping or the like, the flat surface portion 212H of the concave portions 212A and 212B or the plurality of flat surface portions 212H hits the ground plane 31, and the antenna The core 220 can be reliably restricted from contacting the main plate 31.

As described above, according to the present embodiment, the core frame 210 of the antenna unit 37 includes the flat plate portion 211 around which the coil 230 is wound including the antenna core 220, and the flat plate portion 211. Since the concave portions 212A and 213A having a concave cross section for accommodating a part are provided, and the core portions 210 are bent by an impact, the concave portions 212A and 213A are brought into contact with the ground plane 31, so that an impact is applied to the antenna core 200. Can be prevented.
For this reason, even when a heat-treated amorphous core that is vulnerable to impact and has a risk of deteriorating magnetic properties due to impact is applied to the antenna core 220 as in the present embodiment, the antenna core 200 is made of a resin frame or the like. Without covering, the impact on the antenna core 200 can be avoided, and the deterioration of the magnetic characteristics can be avoided. Further, since the antenna unit 37 is reduced in size as compared with a conventional antenna unit provided with a resin frame for absorbing shock, it is possible to provide a small and highly reliable antenna unit 37.

Furthermore, in the present embodiment, the portion of the core frame 210 where the antenna core 220 is disposed and the coil 230 is wound is the flat plate portion 211, so that the core frame 210 is compared with a conventional frame housing the antenna core in a concave portion having a concave shape. Thus, the winding of the coil 230 can be reduced, and the antenna unit 37 can be downsized.
In addition, in the conventional antenna in which the antenna core is accommodated in the concave section having a concave cross section, the antenna core and the coil are separated by the thickness of the core frame, and the reception efficiency is lowered. Since 220 and the coil 230 are close to each other, a decrease in reception efficiency can be avoided and the antenna performance can be improved.
In addition, since the size of the amorphous core has been increased in the past, it is easy to produce sharp parts due to warping and turning when the amorphous metal foil is stamped out. However, in this embodiment, since the amorphous core (antenna core 220) is small in size, the warp and return are small during press punching, and the coil is broken or short-circuited even by insulation with the insulating film 250. Can be avoided.

  Further, in the core frame 210, as shown in FIG. 12, the surface 251 around which the coil 230 is wound is more on the antenna core 200 than the surface 261 on which the antenna circuit substrate 240 is disposed (antenna circuit substrate disposition surface 260). Therefore, the coil 230 can be brought close to the antenna core 200, and the antenna circuit board 240 and the antenna core 200 can be arranged apart from each other. The interference between the magnetic field generated in 200 and the received signal flowing through the antenna circuit board 240 is reduced, and a reduction in reception efficiency can be avoided.

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, in the above-described embodiment, the case where electric power generated by solar power generation is stored in the secondary battery 38 has been described. However, the present invention is not limited to this, and power generation is performed by providing a rotating weight and rotating the rotating weight (kinetic energy). It is also possible to provide a power generation device that performs thermal power generation, and to store the power from the power generation device in the secondary battery 38. In addition, the secondary battery may be charged with external power without the power generation device, or the primary battery may be provided as a power source without the power generation device and the secondary battery.
In the above-described embodiment, the case where the present invention is applied to an antenna built in a wristwatch-type electronic timepiece has been described. However, the present invention is not limited to this, and other portable timepieces such as a pocket watch or a fixed type such as a table clock. It can be widely applied to antennas built in watches and the like.

It is a block diagram which shows the electric constitution of the electronic timepiece which concerns on this invention. It is a figure which shows the external appearance of the timepiece which concerns on one Embodiment of an electronic timepiece. It is a figure which shows the outline | summary of the cross-sectional structure of a timepiece. It is the top view which looked at the movement from the back cover side. It is a top view which shows the state which removed the circuit board and the circuit pressing board from the movement. It is a top view of the timepiece front side of a circuit board. It is a top view of the back cover side of a circuit board. It is a perspective view which shows an antenna unit. It is the perspective view which looked at the antenna unit from the back side. It is a perspective view which shows the core frame of an antenna unit. It is sectional drawing of an antenna unit. It is sectional drawing which shows the mounting state of an antenna unit. (A) is sectional drawing which shows the cross section of the flange part of a core frame with a periphery structure, (B) is sectional drawing which shows the cross section of the concave part except a flange part with a periphery structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Wristwatch (electronic timepiece), 1A ... Time display pointer, 1B ... Analog clock mechanism part, 1C ... Motor drive circuit, 1D ... Control circuit, 1E ... Power supply, 1F ... Antenna, 1G ... Reception circuit, 1H ... Data storage circuit DESCRIPTION OF SYMBOLS 1I ... Hand position detection circuit, 1J ... Power generation device, 1K ... External operation member, 2 ... Clock case, 3 ... Band, 5-7 ... Display pointer, 9 ... Operation button, 10 ... Dial, 20 ... Solar panel, 30 ... Movement (movement for electronic timepiece), 31 ... Ground plate, 31D ... Recess, 31N, 31N1, 31n ... Screw, 31P, 31P1 ... Pipe member, 35 ... Gear train mechanism, 36A, 36B ... Motor, 37 ... Antenna unit ( Antenna), 38 ... secondary battery (power source), 41 ... back cover, 50 ... circuit board (circuit part), 51 ... circuit pressing plate, 55 ... receiving IC (receiving circuit), 56 ... PC (control circuit), 210 ... core frame, 211 ... flat plate portion, 212, 213 ... curved portion, 212A, 213A ... concave portion, 220 ... antenna core, 230 ... coil, 240 ... circuit board for antenna (flexible printed circuit board) ), 250 ... Insulating film.

Claims (6)

In an electronic watch with an antenna on the ground plane,
The antenna includes a core frame formed of an insulating material and having an antenna core laminated with a magnetic sheet fixed to the ground plane side. The core frame includes a flat plate portion on which a coil is wound around an outer periphery including the antenna core. Provided at both ends of the flat plate part, and having a concave part with a concave cross section for accommodating a part of the antenna core,
The concave portion is disposed at a position closer to the ground plane than the antenna core accommodated in the concave portion and with a gap between the ground plane and the core plate when the core frame is bent by an impact. An electronic timepiece characterized by avoiding an impact on the antenna core by restricting contact of the antenna core with the ground plate. The electronic timepiece according to claim 1,
The electronic timepiece characterized in that the concave portion is located in the vicinity of an end portion of the coil. The electronic timepiece according to claim 1 or 2,
The outer periphery including the antenna core is covered with an insulating film for securing the insulation between the antenna core and the coil, and the coil is wound on the insulating film. An electronic timepiece characterized by that. The electronic timepiece according to any one of claims 1 to 3,
A printed circuit board is disposed on a surface opposite to the antenna core at an end including the concave portion in the core frame, and the coil and the receiving circuit are electrically connected through the printed circuit board. An electronic timepiece. The electronic timepiece according to claim 4,
The electronic watch according to claim 1, wherein the core frame is configured such that a surface on which the coil is wound is closer to the antenna core than a surface on which the printed circuit board is disposed. The electronic timepiece according to any one of claims 1 to 5,
An electronic timepiece characterized in that a hole for screwing the antenna to the main plate is formed at an end of the core frame.

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