JP4586749B2 - Electronics - Google Patents

Description

The present invention relates to an electronic device including an antenna .

  Conventionally, a radio timepiece that receives a standard radio wave including time information and automatically corrects the current time is known. In such a radio-controlled timepiece, a small antenna is disposed at a predetermined position. As this antenna, a coil is wound around a rod-shaped core made of amorphous metal, ferrite, or the like, which is a magnetic material. Small antennas are known.

By the way, radio waves are defined by the Radio Law as “radio waves are electromagnetic waves having a frequency of 3 million megahertz or less”. That is, the radio wave is an electromagnetic wave, and the electromagnetic wave is a wave composed of an electric field and a magnetic field. And an electromagnetic wave is propagated because an electric field and a magnetic field vibrate.
Radio waves include vertical polarization, horizontal polarization, circular polarization, and the like, and are classified according to differences in polarization planes.

  Therefore, when receiving radio waves from the antenna, the radio wave radiated from the transmitting station propagates through the space, and the magnetic flux passes through the antenna with the core axis direction being substantially perpendicular to the direction of radio wave arrival. The reception sensitivity is the highest when the inner side of the coil is linked. That is, the reception sensitivity is highest when the antenna is arranged such that the straight line drawn from the reception point to the transmission station is substantially perpendicular to the axial direction of the core.

However, the antenna fixedly arranged inside the electronic device may not necessarily have a good reception sensitivity with respect to the direction of the transmitting station depending on the direction in which the electronic device is installed.
In view of this, there is a technique in which reception sensitivity is improved by capturing as much electromagnetic waves as possible by increasing the reception area by making both ends of the antenna thick (see, for example, Patent Document 1).

In addition, there is an antenna configured to collect more magnetic flux inside the coil by bonding a reception reinforcing member made of a magnetic material such as amorphous metal to the end of the core. For example, as shown in FIG. 14 and the like, the antenna 430 is substantially the same as the core 431 around which the coil 432 is wound and the line segment in the direction substantially perpendicular to the axis of the coil winding portion of the core 431 at both ends thereof. Magnetic thin films (reception reinforcement members) 433 and 433 disposed so as to extend symmetrically.
JP 55-91237 A

However, in the case of Patent Document 1 and the like, there is a problem that in a use environment where the positional relationship between the antenna and the transmitting station is not fixed as in a wristwatch or the like, good radio wave reception is not necessarily obtained depending on the positional relationship.
Further, even in an antenna having a reception reinforcing member, when the direction of arrival of radio waves is greatly inclined with respect to the axial direction of the core, the magnetic flux having a direction different from the signal magnetic flux passing through the inside of the coil by the reception reinforcing member. Occurs, and the reception sensitivity is lowered (see FIG. 14).

An object of the present invention can improve the receiving sensitivity of the antenna, as a result, is to provide an electronic device that can be obtained excellent radio wave reception.

An electronic device according to a first aspect of the present invention is
An antenna (for example, the antenna 30 in FIG. 3) having a core (for example, the core 31 in FIG. 3) formed of a magnetic material and a coil (for example, the coil 32 in FIG. 3) wound around the core. ) To receive radio waves including time information (for example, the reception control circuit unit 44 in FIG. 4);
A receiving reinforcing member (for example, the first and second magnetic thin films 33a and 33b in FIG. 3) disposed near the end of the core and made of a magnetic material;
A movable control member (for example, the first and second actuators 34a, 34b in FIG. 3) that controls the reception reinforcing member so that the reception reinforcing member contacts the end of the core;
Reception intensity detection means (for example, the reception level detection circuit 44h in FIG. 5) for detecting the reception intensity of the radio wave received by the reception means;
Storage means for storing a predetermined radio wave reception intensity value (for example, the ROM 43 in FIG. 4);
And comparison means for comparing the reception intensity value stored in the value and the storage means of the detected receiving intensity (e.g., CPU 41, etc. in FIG. 4) by the reception intensity detection means,
The movable control member receives the reception intensity value detected by the reception intensity detection unit based on a result of comparison by the comparison unit so that the reception intensity value detected by the reception intensity detection unit is larger than the reception intensity value stored in the storage unit. The reinforcing member is movablely controlled.

According to the first aspect of the present invention, even when the positional relationship between the antenna and the radio wave transmitting station is disadvantageous for radio wave reception, the detected reception intensity value is stored in advance. By moving the reception reinforcing member so as to be larger than that and bringing it into contact with the end of the core, the reception sensitivity of the antenna can be improved, and as a result, good radio wave reception can be obtained.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the illustrated examples.

[Embodiment 1]
FIG. 1 is a front view showing a radio wave wristwatch 100 exemplified as a preferred example of the electronic apparatus according to the first embodiment to which the present invention is applied, and FIG. 2 is an enlarged cross-sectional view of a main part taken along line II-II in FIG. It is. FIG. 3 is a rear view showing the radio-controlled wristwatch 100.
3 shows a state in which a part of a back cover 5 (described later) and a housing fixing member 13 (described later) provided in the radio-controlled wristwatch 100 are seen through.

For example, as shown in FIGS. 1 and 2, the radio-controlled wristwatch 100 of the first embodiment includes a watch case (equipment case) 2 made of stainless steel, titanium, or the like that houses a clock timing unit 1 therein.
At both ends of the watch case 2 sandwiching the clock timing unit 1, that is, at the 12 o'clock direction side and the 6 o'clock direction side of the radio-controlled wristwatch 100, the watch bands 3 and 3 for wearing on the wrist of the user. Is attached. In addition, a switch 471 for instructing execution of various functions of the radio-controlled wristwatch 100 constituting the input unit 47 (see FIG. 4) is provided on the outer periphery of the watch case 2.
Further, a watch glass 4 is attached to the upper center of the watch case 2 so as to close the upper opening 2a, for example. Further, a back cover 5 is attached to the lower surface of the watch case 2 via a waterproof ring 6, thereby closing the lower opening of the watch case 2.

  For example, as shown in FIG. 2, the clock timing unit 1 includes an upper housing 11 provided on the viewing side (upper side in FIG. 2) and a lower housing provided on the opposite side (lower side in FIG. 2) from the viewing side. 12.

For example, a solar cell 20 is disposed on the upper surface of the upper housing 11, and a dial plate 7 is disposed above the solar cell 20.
On the upper surface of the dial 7, for example, a frame-shaped member 8 is disposed so that the upper surface substantially contacts the lower surface of the watch glass 4. Further, for example, an opening 7a is formed at a position near 6 o'clock of the dial plate 7, and a liquid crystal panel 9 for displaying time and the like is supported by the upper housing 11 below the opening 7a. . Thereby, when the radio-controlled wristwatch 100 is viewed from the front, the time displayed on the liquid crystal panel 9 through the opening 7a of the dial 7 is visually recognized.
Further, for example, an analog pointer mechanism 10 is disposed at a substantially central portion of the upper housing 11.
The analog pointer mechanism 10 includes, for example, a pointer shaft 10a extending upward from a shaft hole 7a formed at a substantially central portion of the dial plate 7, and a pointer 10b such as an hour hand or a minute hand attached to the pointer shaft 10a. The pointer 10b is moved above the dial plate 7.

In the lower housing 12, for example, a secondary battery 21 for storing electric power generated by the solar battery 20 is incorporated. The lower housing 12 is provided with, for example, a housing fixing member 13 for fixing the lower housing 12 so as to cover from the lower side (the side opposite to the viewing side).
A circuit board 14 is disposed between the lower housing 12 and the upper housing 11, and an antenna 30 that receives a standard radio wave transmitted from a transmitting station (not shown) is connected to the circuit board 14. .

  The antenna 30 is configured to receive, for example, a 40 kHz JJY standard radio wave and a 60 kHz JJY standard radio wave. Specifically, for example, as shown in FIGS. 2 and 3, the antenna 30 is provided at a position near 12 o'clock in the watch case 2, and is wound around a core 31 and a substantially central portion of the core 31. A coil 32 such as a copper wire, the first and second magnetic thin films 33a and 33b disposed in the vicinity of the left and right ends of the core 31, and the first and second magnetic thin films 33a and 33b. First and second actuators 34 a and 34 b that can be brought into contact with predetermined positions on both ends of the core 31, a flexible board 35 that is electrically connected to the circuit board 14, and the like are provided.

The core 31 is made of, for example, a magnetic material such as ferrite or amorphous.
The coil winding part (substantially central part) 311 of the core 31 is formed in a rod shape so as to extend substantially in parallel with the 3 o'clock to 9 o'clock direction (left-right direction), for example (see FIG. 6A). . For example, the coil 32 is wound around the coil winding portion 311 so as to have a substantially uniform thickness in the left-right direction.
Further, at both end portions of the core 31 on the left and right direction side, for example, a bent portion extended from the outer end of the coil winding portion 311 so that the tip end side is bent toward the 6 o'clock direction along the inner surface of the upper housing 11. An extending portion 312 is provided (see FIG. 6A). Specifically, the bending extension 312 includes, for example, an extension extending a predetermined length substantially parallel to the 3 o'clock to 9 o'clock direction, and a 12 o'clock to 6 o'clock direction (coil winding) from the outer end of the extension. A bent portion is provided so as to be bent in a direction substantially symmetric with respect to a line segment in a direction substantially orthogonal to the axis of the turning portion 311.

  The first and second magnetic thin films (reception reinforcement members) 33a and 33b reinforce reception of radio waves by the antenna 30, for example. Specifically, the magnetic thin films 33a and 33b are made of, for example, an amorphous metal. More specifically, each of the magnetic thin films 33a and 33b is a long member having flexibility, for example, in which a plurality of amorphous metal thin films having a thickness of about 16 μm are stacked. Further, each of the magnetic thin films 33a and 33b has a shape that bends inward from the vicinity of the inner surface of the upper housing 11 on the 12 o'clock side. Specifically, one end of the magnetic thin films 33a and 33b is The upper housing 11 is fixed at a predetermined position, and the other end is pressed toward the bent extension portion 312 of the core 31 by the actuators 34a and 34b, thereby forming a bent shape.

  Further, each of the magnetic thin films 33 a and 33 b is preferably a member made of a magnetic material whose magnetic permeability is equal to or lower than the magnetic permeability of the core 31. Accordingly, the magnetic thin films 33a and 33b can more appropriately focus the magnetic flux, and the magnetic flux can be easily passed through the core 31 via the magnetic thin films 33a and 33b, thereby further improving the reception sensitivity of the antenna 30. be able to.

Each of the first and second actuators 34a and 34b includes, for example, a pressing portion 341 that presses a predetermined position of each of the magnetic thin films 33a and 33b, a piezoelectric element 342 that is continuous with the pressing portion 341, and this piezoelectric element. A voltage applying unit 343 that applies a voltage to the piezoelectric element 342 is provided (see FIG. 6A).
The piezoelectric element 342 is formed in a cylindrical shape by a piezoelectric material such as a piezoelectric element, for example, and corresponds to a voltage applied by the voltage applying unit 343 under the control of a reception reinforcing member control mechanism 49 (described later). Thus, it expands and contracts in the 12 o'clock to 6 o'clock direction. Thereby, the other end part side of the magnetic thin films 33a and 33b is pressed to the end part side of the core 31 via the pressing part 341, and is brought into contact with a predetermined position of the end part of the core 31.

When the antenna 30 having such a configuration is placed in a magnetic field (signal magnetic field) generated by a standard radio wave, a magnetic flux (signal magnetic flux) generated by the signal magnetic field is concentrated on the core 31 having a higher permeability than the surrounding space. And interlinks with the coil 32 (passes through the inside of the coil 32). Then, an induced electromotive force [V] is generated in the coil 32 so as to generate a magnetic flux (generated magnetic flux) in a direction that prevents a change in the interlinked signal magnetic flux. Since the standard radio wave is an AC signal whose size and direction change periodically, the induced electromotive force generated in the coil 32 becomes AC power, and the generated magnetic flux changes in size and direction following the time change of the signal magnetic flux. It becomes an alternating magnetic field.
The induced electromotive force generated in the coil 32 is detected by a reception control circuit unit 44 (described later) connected to the coil 32.

Next, the functional configuration of the radio-controlled wristwatch 100 will be described with reference to FIG. Here, FIG. 4 is a block diagram showing a functional configuration of the radio-controlled wristwatch 100.
As shown in FIG. 4, the radio-controlled wristwatch 100 includes a CPU 41, a RAM 42, a ROM 43, a reception control circuit unit 44, a time measuring circuit unit 45, an oscillation circuit unit 46, an input unit 47, a display unit 48, The reception reinforcing member control mechanism 49 is provided. Of these, the CPU 41, RAM 42, ROM 43, reception control circuit unit 44, timing circuit unit 45, and oscillation circuit unit 46 are mounted on the circuit board 14, for example.

  For example, an oscillation circuit unit 46 that constantly outputs a clock signal having a constant frequency is connected to the timing circuit unit 45. The clock circuit unit 45 counts the clock signal input from the oscillation circuit unit 46, clocks the current time, and outputs the current time data to the CPU 41.

  For example, the input unit 47 outputs an operation signal of the corresponding switch 471 to the CPU 41 based on the operation of each switch 471 by the user.

  The display unit 48 includes, for example, a dial 7, the analog pointer mechanism 10, the liquid crystal panel 9, and the like, and displays the current time measured by the time measuring circuit unit 45.

The reception control circuit unit 44 constitutes reception means together with the antenna 30. For example, the reception control circuit unit 44 cuts out unnecessary frequency components of the standard radio wave received by the antenna 30 and extracts a corresponding frequency signal, and based on this frequency signal. Thus, a standard time code including data necessary for a clock function such as a standard time code, an integration code, and a day code is generated and output to the CPU 41.
Hereinafter, the reception control circuit unit 44 will be described in more detail with reference to FIG.

FIG. 5 is a block diagram showing a main configuration of the reception control circuit unit 44.
As shown in FIG. 5, the reception control circuit unit 44 includes, for example, a tuning switching circuit 44a, an AGC amplifier 44b, a filter circuit 44c, a post amplifier 44d, a detection rectifier circuit 44e, a waveform shaping circuit 44f, and an AGC. A voltage control circuit 44g and a reception level detection circuit 44h are provided.

  For example, when receiving a JJY standard radio wave, the tuning switching circuit 44 a switches the reception frequency of the antenna 30 to 40 kHz or 60 kHz in accordance with a tuning control signal output from the CPU 41 and input.

The AGC amplifier 44b outputs, for example, a radio signal (received signal) output from the tuning switching circuit 44a and amplified or attenuated according to a control signal input from the AGC voltage control circuit 44g. .
The filter circuit 44c is, for example, a BPF having an extremely narrow pass band, and is configured by, for example, a crystal filter. The filter circuit 44c, for example, passes a signal in a predetermined frequency range with respect to the signal output from the AGC amplifier 44b and inputs it, and cuts out and outputs a frequency component outside the range.
The post-amplifier 44d, for example, amplifies the signal output and input from the filter circuit 44c to a predetermined signal level and outputs the amplified signal.
For example, the detection rectification circuit 44e detects and outputs a signal output from the post-amplifier 44d.
The AGC voltage control circuit 44g outputs, for example, a control signal that adjusts the amplification degree of the AGC amplifier 44b in accordance with the signal level of the detection signal output from the detection rectification circuit 44e.

  The waveform shaping circuit 44f, for example, shapes the detection signal input from the detection rectification circuit 44e and outputs the waveform. The time code signal (TCO) output after waveform shaping by the waveform shaping circuit 44f is input to the CPU 41.

  The reception level detection circuit (reception intensity detection means) 44h detects, for example, the reception level of the standard radio wave received by the antenna 30 based on the magnitude of the signal level of the detection signal output from the detection rectification circuit 44e and input. The detected reception intensity is output as a reception level. The reception level output from the reception level detection circuit 44h is input to the CPU 41.

  The reception reinforcing member control mechanism 49 controls, for example, the voltage applied to the voltage application unit 343 of each of the first and second actuators 34a and 34b under the control of the CPU 41. That is, the reception reinforcing member control mechanism 49 controls the voltage applied to the voltage application unit 343 of the first and second actuators 34a and 34b under the control of the CPU 41, for example, in time correction processing (described later). Thus, the contact state of the first and second magnetic thin films 33a and 33b with respect to both ends of the core 31 is controlled.

For example, the CPU 41 reads a predetermined program stored in the ROM 43 in accordance with a predetermined timing or an operation signal input from the input unit 47, expands the program in the RAM 42, and executes processing based on the program. Instructs each function unit and transfers data.
Specifically, for example, the CPU 41 extracts time information from a time code signal that is output from the reception control circuit unit 44 and is input, and performs time correction processing that corrects the time based on this time information. Yes. More specifically, in the time adjustment process, for example, the CPU 41 corrects the time measured by the time measurement circuit unit 45 based on the time information, and displays or corrects the corrected current time on the liquid crystal panel 9. The analog pointer mechanism 10 is controlled so as to indicate the time, and processing for moving the pointer 10b is performed.

The RAM 42 is, for example, a volatile semiconductor memory, and includes a memory area for temporarily holding various programs executed by the CPU 41 and data related to the execution of these programs, and is used as a work area for the CPU 41. It is what
Specifically, the RAM 42 includes a reception time storage area 42a for storing the reception time of the standard radio wave. In this reception time storage area 42a, for example, a predetermined reception time (for example, midnight) is set as an initial value.

  The ROM 43 stores programs, data, and the like for realizing various functions of the radio wristwatch 100 in addition to various initial setting values and initialization programs. Specifically, the ROM 43 stores a control program 43a43a including a movable control program a1 and a comparison program a2, a reception regulation level 43b, and the like.

  The movable control program a1 realizes, for example, a function related to processing for controlling the voltage applied by the reception reinforcing member control mechanism 49 to the voltage application unit 343 of each of the first and second actuators 34a and 34b in the CPU 41. It is a program to make it. Specifically, the movable control program a1 is a reception reinforcing member for moving the first and second magnetic thin films 33a and 33b by the CPU 41 by the first and second actuators 34a and 34b in the time correction process. This is for controlling the control mechanism 49. More specifically, in the movable control program a1, the CPU 41 stores in advance the reception level detected by the reception level detection circuit 44h in the ROM 43 based on the comparison result of the time correction process comparison process (described later). For controlling the reception reinforcing member control mechanism 49 to move the first and second magnetic thin films 33a, 33b by the first and second actuators 34a, 34b so as to be larger than the reception regulation level 43b. It is.

That is, based on the execution of the movable control program a1 by the CPU 41, the reception reinforcing member control mechanism 49 is controlled to control the voltage applied to the voltage application unit 343 of the first and second actuators 34a, 34b, and the first The second actuators 34a and 34b are expanded and contracted to control the contact state of the first and second magnetic thin films 33a and 33b with respect to both ends of the core 31.
For example, the reception reinforcing member control mechanism 49 expands both the first and second actuators 34 a and 34 b, and causes the first and second magnetic thin films 33 a and 33 b to be attached to both end portions of the core 31 via the pressing portion 341. The voltage applied to each voltage application unit 343 is controlled so as to be pressed to a predetermined position on the end (see FIG. 6A).
Further, the reception reinforcing member control mechanism 49 extends, for example, the first actuator 34 a and moves the first magnetic thin film 33 a to the end (right end) side of the core 31 through the pressing portion 341. Each of the second magnetic thin film 33b is separated from the 3 o'clock side end (left end) of the core 31 by pressing and bringing it into contact with a predetermined position of the end and contracting the second actuator 34b. The voltage applied to the voltage application unit 343 is controlled (see FIG. 6B).
Further, the reception reinforcing member control mechanism 49, for example, extends the second actuator 34b and presses the second magnetic thin film 33b toward the left end portion side of the core 31 via the pressing portion 341, thereby determining the predetermined end portion. The voltage applied to each voltage application unit 343 is controlled so that the first actuator 34a is contracted and the first magnetic thin film 33a is separated from the right end of the core 31 while being brought into contact with the position (FIG. 6 ( c)).

  The comparison program a2 is for causing the CPU 41 to function as comparison means. That is, the comparison program a2 is a program for causing the CPU 41 to realize a function related to comparison processing for comparing the reception level detected by the reception level detection circuit 44h with the reception specified level (reception intensity value) 43b stored in the ROM 43. It is. Specifically, the comparison program a2 receives the reception level detection circuit 44h every time the CPU 41 changes the contact state of the first and second magnetic thin films 33a and 33b with respect to both ends of the core 31 in the time correction process. This is for comparing the reception level detected by the above and the reception regulation level 43b.

  The reception regulation level 43b is, for example, a reception level (reception intensity value) that serves as a reference when determining whether to start processing for demodulating the received standard radio wave and extracting time information. Has been.

Next, the time correction process will be described with reference to FIGS.
Here, FIG. 7 and FIG. 8 are flowcharts showing an example of the operation related to the time correction process.

  In the time correction process, first, the CPU 41 refers to the reception time storage area 42a to determine whether it is a reception time (step S1). Here, when the current time becomes the reception time preset in the reception time storage area 42a (step S1; YES), the CPU 41 reads the movable control program a1 from the ROM 43 and expands it in the RAM 42. Based on the execution of the movable control program a1, the reception reinforcing member control mechanism 49 controls the voltage applied to the voltage application unit 343 of the first and second actuators 34a and 34b, and the first and second actuators The first and second magnetic thin films 33a and 33b are brought into contact with both ends of the core 31 by extending 34a and 34b (step S2; see FIG. 6A).

  Next, the CPU 41 selects a standard radio wave transmission station based on the operation of a predetermined switch 471 by the user (step S3), and then controls the reception control circuit unit 44 according to the selected transmission station to perform the standard radio wave transmission. Starts to be received (step S4).

Subsequently, the CPU 41 reads the comparison program a2 from the ROM 43 and develops it in the RAM 42. Based on this comparison program a2, the CPU 41 compares and determines the reception level detected by the reception level detection circuit 44h and the reception specified level 43b (step S5). ).
Here, if it is determined that the reception level is less than the reception regulation level 43b (step S5; NO), the CPU 41 causes the reception reinforcing member control mechanism 49 to perform first and second based on the execution of the movable control program a1. By controlling the voltage applied to the voltage application unit 343 of the actuators 34a and 34b and extending the first actuator 34a, the first magnetic thin film 33a is brought into contact with a predetermined position at the right end of the core 31, and By contracting the second actuator 34b, the second magnetic thin film 33b is separated from the left end of the core 31 (step S6; see FIG. 6B).

Thereafter, the CPU 41 switches to a tuning capacitor that corrects the deviation of the tuning frequency (resonance frequency) due to the fluctuation of the inductance of the antenna 30 (step S7), and then detects the reception level detection circuit 44h based on the execution of the comparison program a2. The received reception level is compared with the reception regulation level 43b (step S8).
Here, if it is determined that the reception level is less than the reception regulation level 43b (step S8; NO), the CPU 41 causes the reception reinforcing member control mechanism 49 to perform first and second based on the execution of the movable control program a1. The second magnetic thin film 33b is brought into contact with a predetermined position at the left end portion of the core 31 by controlling the voltage applied to the voltage application unit 343 of the actuators 34a and 34b and extending the second actuator 34b. The first magnetic thin film 33a is separated from the right end of the core 31 by contracting the first actuator 34a (step S9; see FIG. 6C).

After that, the CPU 41 switches to a tuning capacitor that corrects the tuning frequency shift due to the variation in the inductance of the antenna 30 (step S10), and then the reception level detected by the reception level detection circuit 44h based on the execution of the comparison program a2. And the reception regulation level 43b are compared (step S11).
Here, if it is determined that the reception level is lower than the reception regulation level 43b (step S11; NO), the CPU 41 moves the first and second actuators 34a and 34b based on the execution of the movable control program a1. By extending, the first and second magnetic thin films 33a and 33b are brought into contact with both ends of the core 31 (step S12; see FIG. 6A).

Thereafter, the CPU 41 switches to a tuning capacitor that corrects a tuning frequency shift due to an inductance variation of the antenna 30 (step S13), and then starts a process of demodulating a standard radio wave received by the antenna 30 and extracting time information. (Step S14).
Then, the CPU 41 determines whether the reception of the standard radio wave is successful based on the time information extraction processing result (step S15).
If the standard radio wave is successfully received (step S15; YES), the CPU 41 stops the standard radio wave reception by the antenna 30 (step S16), and then corrects the current time according to the extracted time information (step S16). Step S17). Thereafter, the CPU 41 changes the reception time of the standard radio wave to a time 24 hours after the current time, updates the reception time storage area 42a (step S18), moves to step S1, and enters a standby state.

  On the other hand, if the reception of the standard radio wave is not successful in step S15 (step S15; NO), the CPU 41 stops the reception of the standard radio wave by the antenna 30 (step 19), and then sets the reception time of the standard radio wave. The reception time storage area 42a is updated by changing to a time one hour after the current time (step S20), and the process proceeds to step S1 to enter a standby state.

  If it is determined in step S5, step S8 and step S11 that the reception level is equal to or higher than the reception regulation level 43b (step S5, S8, S11; YES), the CPU 41 proceeds to step S14, The subsequent processing is executed.

  EXAMPLES Next, although an Example demonstrates this invention concretely, this invention is not limited to these.

  In Measurement Example 1, using an antenna configured such that the first and second magnetic thin films can be contacted to both ends of the core, the angle of the core in the axial direction relative to the radio wave arrival direction (rotation angle θ [° ]), The output voltage at the antenna end was measured.

[Configuration of antenna]
The antenna used had a length of 20 [mm] in the axial direction of the coil winding portion of the core.
As the first and second magnetic thin films, three amorphous metal thin films having an outer shape of 15 [mm] × 2 [mm] and a thickness of 16 μm were stacked.
The rotation angle θ is 0 [°] when the direction of the core axis is perpendicular to the direction of radio wave arrival, and when the antenna is rotated clockwise, it is a positive (positive) angle and rotates counterclockwise. The case where it was made into the minus (-) angle (refer FIG. 9).
The contact state of the first and second magnetic thin films is adjusted by bringing both the first and second magnetic thin films into contact with each other at a rotation angle of 0 [°]. Then, a magnetic flux (reverse magnetic field) that is generated by a change in the angle of each magnetic thin film with respect to the direction of arrival of radio waves as the rotational angle θ [°] increases or decreases, which is different in direction from the signal magnetic flux that mainly passes through the inside of the coil. The magnetic thin film on the side affected by (for example, the right magnetic thin film in FIG. 14) is brought into a non-contact state.

Measurement Example 2 used an antenna in which the first and second magnetic thin films were fixed in contact with both ends of the core.
In measurement example 3, an antenna in which neither the first magnetic thin film nor the second magnetic thin film was attached to the core was used.

[Measurement condition]
A transmission radio wave having a frequency of 40 [kHz] and an output voltage of 20 [mV] was transmitted from a loop antenna having a diameter of 60 [cm].
The radio wave wristwatch was placed at a distance of 3 [m] from the loop antenna to receive radio waves.
In addition, since the inductance of the antenna fluctuates and the tuning frequency (resonance frequency) shifts depending on the contact state of the first and second magnetic thin films with the core, the tuning capacitance is appropriately set so that the resonance state is obtained at a frequency of 40 [kHz]. It was adjusted.

[Measurement result]
The measurement results of the output voltage at the antenna end in measurement examples 1 to 3 are shown in FIG.
In FIG. 10, the output voltage [μV] from the antenna end represents a value amplified using a predetermined amplifier.

As shown in FIG. 10, when the first and second magnetic thin films are brought into contact with both ends of the core (at a rotation angle of 0 [°]), the output voltages of the antennas in Measurement Example 1 and Measurement Example 2 are Compared to that of Measurement Example 3 in which no magnetic thin film was attached, the improvement was about 16%. However, the output voltage of the antenna of measurement example 2 in which the first and second magnetic thin films were fixed in contact with each other decreased as in the case of measurement example 3 as the fluctuation of the rotation angle increased.
On the other hand, the antenna of measurement example 1 was able to reduce the rate of decrease in output voltage compared to those of measurement example 2 and measurement example 3. For example, at the rotation angle of −90 [°], the antenna of Measurement Example 1 was able to improve the output voltage about 2.4 times that of the antenna of Measurement Example 3.

As described above, according to the radio wave wristwatch 100 of the first embodiment, the detected reception intensity is stored in advance even when the positional relationship between the antenna 30 and the radio wave transmission station is disadvantageous for radio wave reception. The receiving sensitivity of the antenna 30 can be improved by moving the magnetic thin films 33a and 33b so as to be larger than the received reception strength value and bringing them into contact with the end of the core 31. More specifically, since the magnetic thin films 33a and 33b are disposed in the vicinity of both end portions of the core 31, both end portions are controlled by controlling the contact of the magnetic thin films 33a and 33b with respect to both end portions of the core 31. Even if the antenna 30 has the core 31 formed by bending the antenna 30, the receiving sensitivity of the antenna 30 can be improved.
Therefore, even when the small-sized antenna 30 is mounted on the radio-controlled wristwatch 100 or the metal watch case 2 is provided to improve the high-class feeling, it is possible to obtain a favorable radio wave reception.

  In addition, since the magnetic thin films 33a and 33b are formed by laminating amorphous metal thin films, the magnetic thin films 33a and 33b having high permeability and higher performance can be used, and more magnetic flux can be obtained by the magnetic thin films 33a and 33b. Can be suitably collected in the core 31. Moreover, generation | occurrence | production of an eddy current can be suppressed and the loss by the said eddy current can be suppressed. As described above, the magnetic thin films 33a and 33b can concentrate the magnetic flux more suitably, and the magnetic flux can be easily passed through the core 31 via the magnetic thin films 33a and 33b, thereby further improving the reception sensitivity of the antenna 30. Can do.

[Embodiment 2]
Hereinafter, the radio-controlled wristwatch 200 according to the second embodiment will be described with reference to FIGS. 11 and 12.
Here, FIG. 11 is a rear view showing a radio wave wristwatch 200 exemplified as a preferred example of the electronic apparatus according to the second embodiment to which the present invention is applied, and FIG. 12 is a magnetic thin film 233a of the antenna 230 provided in the radio wave wristwatch 200. It is the figure which showed typically the movable state of 233b. 12 shows a state in which a part of the back cover 5 and the housing fixing member 13 provided in the radio-controlled wristwatch 200 is seen through, and first and second actuators 234a that overlap with both ends of the core 31 in the vertical direction. 234b and a part of the first and second magnetic thin films 233a and 233b are represented by wavy lines.
The radio-controlled wristwatch 200 of the second embodiment is substantially the same as that of the first embodiment except for the configuration of the antenna 230. Therefore, the same components are denoted by the same reference numerals and the description thereof is omitted.

  For example, as shown in FIGS. 11 and 12, the radio-controlled wristwatch 200 according to the second embodiment includes first and second actuators 234a and 234b on the lower side of the dial 7, and the first and second actuators 234a and 234b The other end portions of the first and second magnetic thin films 233a and 233b are moved up and down to come into contact with predetermined positions of the end portions of the core 31.

That is, the first and second actuators 234a and 234b are arranged, for example, in the vertical direction, and the piezoelectric element 342 can be expanded and contracted in the vertical direction according to the voltage applied by the voltage application unit 343. ing.
For example, as shown in FIG. 11, the first and second magnetic thin films 233 a and 233 b are arranged in an inverted “C” shape so as to extend toward the 12 o'clock direction toward the outside. The first and second magnetic thin films 233a and 233b are fixedly attached to a thin film fixing member provided at one end of the dial 7 and the other end is movable in the vertical direction. It can be moved up and down by two actuators 234a and 234b.
Specifically, for example, the reception reinforcing member control mechanism 49 extends both the first and second actuators 234a and 234b, and causes the first and second magnetic thin films 233a and 233b to be extended via the pressing portion 341. The voltage applied to each voltage applying unit 343 is controlled so as to be pressed downward and brought into contact with predetermined positions at both ends of the core 31 (see FIG. 12A).
In addition, the reception reinforcing member control mechanism 49 extends the first actuator 234a and presses the first magnetic thin film 233a downward via the pressing portion 341, for example, to a predetermined position at the right end portion of the core 31. At the same time, the second actuator 234b is contracted, and the voltage applied to each voltage application unit 343 is controlled so as to move the second magnetic thin film 233b upward (see FIG. 12B).
In addition, the reception reinforcing member control mechanism 49 extends the second actuator 234b and presses the second magnetic thin film 233b downward via the pressing portion 341, for example, to a predetermined position at the left end portion of the core 31. At the same time, the first actuator 234a is contracted to control the voltage applied to each voltage application unit 343 so as to move the first magnetic thin film 233a upward (see FIG. 12C).

As described above, according to the radio-controlled wristwatch 200 of the second embodiment, the antenna having a configuration in which the other end portions of the first and second magnetic thin films 233a and 233b are moved up and down to come into contact with both end portions of the core 31. Even if it is 230, the effect similar to the said Embodiment 1 can be acquired.
That is, even if the positional relationship between the antenna 230 and the radio wave transmitting station is disadvantageous for radio wave reception, the magnetic thin film 233a, so that the detected reception intensity is larger than the reception intensity value stored in advance. The receiving sensitivity of the antenna 30 can be improved by moving the 233b and bringing it into contact with the end of the core 31. More specifically, since the magnetic thin films 233a and 233b are disposed in the vicinity of both ends of the core 31, both end portions are controlled by controlling the contact of the magnetic thin films 233a and 233b with both ends of the core 31. Even if the antenna 230 has the core 31 formed by bending, the receiving sensitivity of the antenna 230 can be improved.
As a result, the radio wristwatch 100 can obtain good radio wave reception.

The present invention is not limited to the first and second embodiments, and various improvements and design changes may be made without departing from the spirit of the present invention.
For example, in the first and second embodiments, the magnetic thin films 33a, 33b, 233a, and 233b are exemplified by those made of amorphous metal. However, the present invention is not limited to this, and radio waves generated by the antennas 30 and 230 are used. Any material may be used as long as it is formed from a material capable of reinforcing reception of the signal.

<Modification 1>
In the first and second embodiments, for example, the first and second magnetic thin films 33a and 33b (233a and 233b) are exemplified by those having flexibility, but the magnetic thin films 33a and 33b The configuration is not limited to this.
Hereinafter, the radio-controlled wristwatch 300 of the first modification will be described with reference to FIG.
The radio-controlled wristwatch 300 according to the first modification is substantially the same as the first embodiment and the second embodiment except for the configuration of the antenna 330, and thus the same components are denoted by the same reference numerals and the description thereof is omitted. To do.

As shown in FIG. 13, the antenna 330 of the radio-controlled wristwatch 300 according to the first modification is provided with first and second magnetic thin films 333 a and 333 b that are bent in a substantially “h” shape, for example. Yes.
The first and second magnetic thin films 333a and 333b are made of, for example, amorphous metal, and are rotatable about the vertical axis of the rotation shaft 33c provided in the bending extension portion 312. . The first and second magnetic thin films 333a and 333b are urged by a predetermined urging member (not shown) so as to rotate in the 12 o'clock direction in a normal state.
Then, the first and second actuators 34a and 34b are extended against the urging force of the urging member by the reception reinforcing member control mechanism 49, so that the first and second actuators 34a and 34b are extended via the pressing portion 341. The pressed portions of the magnetic thin films 333a and 333b are pressed so as to rotate in the 6 o'clock direction so as to contact each end of the core 31, or the first and second actuators 34a and 34b are contracted to attach the magnetic thin films 333a and 333b. According to the urging force of the urging member, the pressed parts of the first and second magnetic thin films 333 a and 333 b are rotated toward the 12 o'clock direction to be separated from the end of the core 31.

  According to the radio wave wristwatch 300 of Modification 1 having such a configuration, the detected reception intensity is stored in advance even when the positional relationship between the antenna 330 and the radio wave transmission station is disadvantageous for radio wave reception. The reception sensitivity of the antenna 330 can be improved by moving the magnetic thin films 333 a and 333 b so as to be larger than the received reception intensity value and bringing them into contact with the end of the core 31. As a result, the radio wristwatch 100 can obtain good radio wave reception.

  In the above embodiment, the radio wristwatches 100, 200, and 300 are illustrated as electronic devices. However, the present invention is not limited to this, and any electronic device may be used as long as it is configured to receive radio waves with the antenna 30. good. For example, a fixed radio timepiece or a small radio may be used.

It is a front view which shows the radio wave wristwatch illustrated as a suitable example of the electronic device of Embodiment 1 to which this invention is applied. It is an expanded sectional view of the principal part in the II-II line of FIG. It is a rear view which shows the radio-controlled wristwatch of FIG. It is a block diagram which shows the function structure of the radio wristwatch of FIG. It is a block diagram which shows the principal part structure of the reception control circuit part with which the radio wristwatch of FIG. 1 is equipped. It is the figure which showed typically the movable state of the magnetic thin film of the antenna with which the radio wave wristwatch of FIG. 1 was equipped. It is a flowchart which shows an example of the operation | movement which concerns on the time correction process by the radio wave wristwatch of FIG. It is a flowchart which shows the continuation of the time correction process of FIG. It is the top view which showed typically the antenna with which the radio wristwatch of FIG. 1 is equipped. It is the figure which showed the correspondence of the angle with respect to the electromagnetic wave arrival direction of the antenna of FIG. 9, and an antenna end output. It is a rear view which shows the radio wave wristwatch illustrated as a suitable example of the electronic device of Embodiment 2 to which this invention is applied. It is the figure which showed typically the movable state of the magnetic thin film of the antenna with which the radio wave wristwatch of FIG. 11 was equipped. It is a rear view which shows the radio-controlled wristwatch of the modification 1. It is the figure which showed typically the antenna which has a magnetic thin film with which the conventional radio wave wristwatch was equipped.

Explanation of symbols

100 radio wave watch (electronic equipment)
2 Watch case (equipment case)
7 Dial (decorative board)
30 Antenna 31 Core 32 Coils 33a, 33b, 233a, 233b, 333a, 333b Magnetic thin film (reception reinforcement member)
34a, 34b, 234a, 234b Actuator (movable control member)
41 CPU (comparison means)
43 ROM (storage means)
44 Reception control circuit section (reception means)
44h Reception level detection circuit (reception intensity detection means)

Claims (1)

Receiving means for receiving radio waves including time information by an antenna having a core formed of a magnetic material and a coil wound around the core;
A receiving reinforcement member made of a magnetic material, disposed near the end of the core;
A movable control member that movably controls the reception reinforcing member so that the reception reinforcing member contacts the end of the core;
Reception intensity detection means for detecting the reception intensity of the radio wave received by the reception means;
Storage means for storing a predetermined radio wave reception intensity value;
And comparison means for comparing the reception intensity value stored in the value and the storage means of the detected receiving intensity by the reception intensity detection means,
The movable control member receives the reception intensity value detected by the reception intensity detection unit based on a result of comparison by the comparison unit so that the reception intensity value detected by the reception intensity detection unit is larger than the reception intensity value stored in the storage unit. An electronic device characterized in that a reinforcing member is movablely controlled.

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