JP7049928B2 - Radio clock - Google Patents

Description

The present invention relates to a radio clock.

As a conventional radio-controlled clock, for example, a radio-controlled clock having a function of receiving radio waves including time information such as satellite radio waves via an antenna and correcting the internal time of the own machine is known. Further, as a conventional radio-controlled clock, for example, a radio-controlled clock in which a battery, an antenna, and a motor are arranged so as not to overlap each other for thinning is also known (see Patent Documents 1 and 2).

Japanese Patent No. 6223241 Japanese Unexamined Patent Publication No. 2017-37057

By the way, the radio-controlled timepiece as described above has room for further improvement in terms of ensuring appropriate antenna sensitivity while suppressing the increase in size, for example.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a radio-controlled timepiece capable of ensuring an appropriate antenna sensitivity.

In order to achieve the above object, the radio wave clock according to the present invention includes an outer case, a battery provided inside the outer case, a motor provided inside the outer case and capable of operating by the power of the battery, and a motor. The movement comprises a movement provided inside the outer case and comprising an antenna for receiving radio waves from the outside of the outer case, the antenna having a radiation electrode for receiving radio waves, and the movement. Inside, in the area between the battery and the antenna, which is large enough to dispose the motor and at least the first motor non-arrangement area where the coil portion of the motor is not arranged , and the end face of the antenna. It has a second motor non-arrangement region adjacent to the end face on the radiation side defined by the radiation electrode and at least the coil portion of the motor is not arranged , and the first motor non-arrangement region is the battery and the antenna. The second motor non-placement region is secured by arranging the motor at a distance equal to or larger than the minimum length in the lateral direction of the motor, and the second motor non-placement region is formed on the side of the radiation electrode on the battery side. The area is located on the side opposite to the battery side with the including boundary line as the boundary, and is a region surrounded by the boundary line and the inner wall surface of the exterior case .

Further, in the radio-controlled clock, the antenna has a dielectric, and the first motor non-arrangement region is a first reference point located at one end of the side of the dielectric on the battery side, and other than the side. The distance between the second reference point located at the end, the third reference point on the battery and the shortest distance from the first reference point, and the point on the battery and the second reference point. It can be assumed that it is a region corresponding to a rectangular shape connecting the fourth reference point having the shortest distance.

Further, in the radio-controlled timepiece, the antenna has a dielectric, and the first motor non-arrangement region is a first reference point located at one end of the side of the dielectric on the battery side, and other than the side. It can be a region corresponding to a triangular shape connecting a second reference point located at the end and a third reference point which is a point on the battery and has the shortest distance from the side.

Further, in the radio-controlled clock, the antenna has a radiation electrode for receiving radio waves, and the first motor non-arrangement region includes a first reference point located at one end of the battery-side side of the radiation electrode. The second reference point located at the other end of the side, the third reference point which is a point on the battery and has the shortest distance from the first reference point, and the second reference point which is a point on the battery. It can be a region corresponding to a rectangular shape connecting the fourth reference point having the shortest distance to the point.

Further, in the radio-controlled clock, the antenna has a radiation electrode for receiving radio waves, and the first motor non-arrangement region includes a first reference point located at one end of the battery-side side of the radiation electrode. It shall be a region corresponding to a triangle shape connecting a second reference point located at the other end of the side and a third reference point which is a point on the battery and has the shortest distance from the side. Can be done.

Further, in the radio-controlled timepiece, the antenna has a radiation electrode for receiving radio waves, and the movement is internally adjacent to the end face of the antenna and the end face on the radiation side defined by the radiation electrode. At least, it may have a second motor non-arrangement region in which the coil portion of the motor is not arranged.

Further, in the radio-controlled timepiece, the second motor non-arrangement region may be partitioned by an extension line extending from the boundary line that partitions the first motor non-arrangement region.

Further, in the radio-controlled clock, the antenna may be a flat monopole antenna.

In the radio-controlled timepiece according to the present invention, the motor can be operated by the electric power of the battery provided inside the outer case. Further, the radio-controlled timepiece can receive radio waves from the outside by an antenna provided inside the outer case. In this configuration, the radio-controlled timepiece is a region between the battery and the antenna, which is large enough to dispose the motor, and at least the coil portion of the motor is not arranged in the first motor non-arranged region inside the movement. Has. With this configuration, the radio-controlled clock can suppress the influence of the motor on the reception sensitivity of the antenna. As a result, the radio-controlled clock has the effect that an appropriate antenna sensitivity can be ensured.

FIG. 1 is a front view showing a schematic configuration of a radio-controlled clock according to the first embodiment. FIG. 2 is a cross-sectional view (AA cross-sectional view shown in FIG. 1) showing a schematic configuration of a radio-controlled clock according to the first embodiment. FIG. 3 is a schematic perspective view showing a schematic configuration of an antenna of a radio-controlled clock according to the first embodiment. FIG. 4 is a schematic plan view showing a schematic configuration in the accommodation space portion of the radio-controlled clock according to the first embodiment. FIG. 5 is a schematic plan view showing an example of a first motor non-arranged region in the accommodation space of the radio-controlled timepiece according to the first embodiment. FIG. 6 is a schematic plan view showing another example of the first motor non-arrangement region in the accommodation space portion of the radio-controlled clock according to the first embodiment. FIG. 7 is a schematic plan view showing a modified example of the first motor non-arranged region in the accommodation space portion of the radio-controlled clock according to the first embodiment. FIG. 8 is a schematic plan view showing a modified example of the first motor non-arranged region in the accommodation space portion of the radio-controlled clock according to the first embodiment. FIG. 9 is a schematic plan view showing a schematic configuration in the accommodation space portion of the radio-controlled clock according to the second embodiment. FIG. 10 is a schematic plan view showing an example of a second motor non-arranged region in the accommodation space of the radio-controlled timepiece according to the second embodiment. FIG. 11 is a schematic plan view showing another example of the second motor non-arrangement region in the accommodation space portion of the radio-controlled timepiece according to the second embodiment.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. It should be noted that FIGS. 4 to 11 described below omit and simplify the detailed configuration, shape, and the like in the accommodation space portion, and mainly show the positional relationship of the battery, the motor, and the antenna.

[Embodiment 1]
The radio-controlled clock 1 of the present embodiment shown in FIGS. 1 and 2 receives radio waves including time information such as satellite radio waves, and has an electron having a function of correcting the internal time of the clock of the own machine based on the acquired time information. It is a clock. The radio-controlled clock 1 of the present embodiment typically receives a GPS radio wave output from a GPS (GLOBAL POSITIONING SYSTEM) satellite. The GPS radio wave is a radio wave including GPS time information, and for example, two types of a 1.5 GHz band (1575.42 MHz) and a 1.2 GHz band (1227.60 MHz) are used. Here, the radio-controlled clock 1 is an analog electronic clock that displays the time by the physical pointer 6. Hereinafter, each configuration of the radio-controlled clock 1 will be described in detail with reference to each figure.

In the following description, the direction along the clock center axis X1 of the radio-controlled clock 1 is referred to as "axis direction X", the direction orthogonal to the clock center axis X1 is referred to as "diametric direction Y", and the clock center axis X1 is referred to as "diameter direction Y". The circumferential direction around the center is called "circumferential direction Z". The axial direction X corresponds to the vertical direction of the radio-controlled clock 1, one side is referred to as "front side", and the other side is referred to as "rear side". In the radial direction Y, the side closer to the clock center axis X1 is referred to as "inside", and the side far from the clock center axis X1 is referred to as "outside". Here, the clock center axis X1 is a reference axis set in advance for the radio-controlled clock 1, and corresponds to the central axis of the main configuration of the radio-controlled clock 1. The watch center axis X1 typically corresponds to the center axis of the movement MM or the exterior case 2. The clock center axis X1 corresponds to an axis that passes through the geometric center of gravity of the movement MM and the outer case 2, for example, when the outer shape of the movement MM and the inner shape of the outer case 2 are cylindrical. Corresponds to the central axis of the cylindrical shape. Further, the clock center axis X1 typically coincides with the rotation axis of the main pointer (second hand 61, minute hand 62, hour hand 63, which will be described later in FIG. 1).

Specifically, the radio-controlled clock 1 includes an exterior case 2, a windshield 3, a dial 4, a counter ring 5, a pointer 6, an operation unit 7, and a movement MM. In the radio-controlled timepiece 1, the movement MM is housed in the storage space 24 formed inside the exterior case 2, and the dial 4, the dial ring 5, and the pointer 6 are assembled, and the dial 4 and the counter ring are assembled by the windshield 3. 5, guideline 6, etc. are protected.

The outer case 2 constitutes the outermost shell of the radio-controlled timepiece 1. The outer case 2 is formed of a conductive material such as titanium or a titanium alloy. Further, the outer case 2 may be formed of a non-conductive material such as ceramics, glass, or resin. The outer case 2 includes a main body 21, a back cover 22, and a can 23. In the present embodiment, the main body portion 21 has a split structure consisting of two members like a combination of a bezel portion and a body portion, and by combining the two members, a substantially cylindrical shape centered on the clock center axis X1 is formed. It is composed. Both ends of the main body 21 are open in the axial direction X. The back cover 22 is a member that closes the opening on the back surface side of the main body 21 in the axial direction X. The back cover 22 is formed separately from the main body portion 21 and is formed in a substantially disk shape centered on the clock center axis X1. The can 23 is formed so as to project from the outer peripheral surface of the main body 21. The can 23 is integrally formed with the main body portion 21. A plurality of cans 23 are provided. A belt 25 is connected to the can 23. The belt 25 is a member that is wound around an arm or the like and attached.

The windshield 3 is a member that is assembled to the main body 21 and closes the opening on the front side of the main body 21 in the axial direction X. The windshield 3 is formed of a light-transmitting material that transmits light, more specifically, a transparent material such as glass. The windshield 3 is formed in a substantially disk shape centered on the clock center axis X1. As a result, the windshield 3 can visually recognize the inside of the main body portion 21 (exterior case 2) and can protect the parts arranged inside.

Here, the accommodation space portion 24 is a closed space formed inside the exterior case 2 by the above-mentioned exterior case 2 (main body portion 21 and back cover 22) and the windshield 3 attached to the exterior case 2. In the present embodiment, the accommodation space portion 24 is formed inside the main body portion 21 as a substantially cylindrical space portion centered on the clock center axis X1. In the accommodation space portion 24, each component is a movement MM, a dial 4, a counter ring 5, and a pointer 6 from the back side (back cover 22 side) to the front side (windshield 3 side) along the axial direction X. Arranged in order.

The dial 4 is arranged on the front side of the movement MM with respect to the axial direction X and at a position facing the windshield 3 so as to be visible through the windshield 3. The shape of the dial 4 is the same as or similar to the shape of the inner circumference of the main body 21, and in the present embodiment, it is formed into a substantially disk shape centered on the clock center axis X1. The dial 4 is formed of a light-transmitting material that transmits light at a predetermined transmittance. Further, the dial 4 is formed of an insulating material such as synthetic resin. The dial 4 includes an index 41 and a sun window 42. The index 41 represents a time and is a scale pointed to by the pointer 6. A plurality of indexes 41 are arranged on the front surface side of the dial 4 in the axial direction X at equal intervals along the circumferential direction Z. Each index 41 may be a protruding member or may be printed on the dial 4. The sun window 42 is an opening for making a part of the characters on the sun wheel 12, which will be described later, visible. The sun window 42 is formed so as to penetrate the dial 4 along the axial direction X.

The counter ring 5 is a member that presses the peripheral edge of the dial 4 and holds the dial 4 in a predetermined position. The counter ring 5 is formed in a substantially annular shape centered on the clock center axis X1. The dial ring 5 is provided on the front side of the dial 4 in the axial direction X, and holds the dial 4 between the dial 4 and the movement MM.

The pointer 6 is a display member that displays information such as a time by pointing to the index 41 of the dial 4, and constitutes a clock operation unit. A plurality of pointers 6 are formed in a needle shape and are provided on the front side of the dial 4 in the axial direction X. The plurality of pointers 6 include a second hand 61, a minute hand 62, an hour hand 63, and a small hand 64. The second hand 61, the minute hand 62, and the hour hand 63 constitute a main pointer rotatably provided on the outer case 2 with the main hand rotation axis X2 as the center of rotation. The main hand rotation axis X2 coincides with the clock center axis X1. The second hand 61, the minute hand 62, and the hour hand 63 are arranged coaxially. The second hand 61, the minute hand 62, and the hour hand 63 rotate in a circular rotation locus with the main hand rotation axis X2 as the center of rotation. On the other hand, the small needle 64 constitutes a sub-pointer rotatably provided on the outer case 2 with the sub-needle rotation axis X3 as the center of rotation. The secondary hand rotation axis X3 is an axis different from the main hand rotation axis X2, and is located parallel to the clock center axis X1 and deviated from the clock center axis X1. Here, a plurality of small needles 64 are provided, two of which are rotatably provided with the common auxiliary needle rotation axis X3 as the rotation center, and the rest are rotatably provided with the different auxiliary needle rotation axis X3 as the rotation center. .. Further, here, each small needle 64 rotates in a circular rotation locus with each auxiliary needle rotation axis X3 as the rotation center.

The operation unit 7 is a part that receives an external operation. The operation unit 7 is provided so as to be exposed to the outside from the main body portion 21 of the outer case 2. The operation unit 7 of the present embodiment includes a crown 71, push buttons 72, 73 and the like. The operation unit 7 receives various operations in conjunction with the mechanism in the movement MM in response to a pull-out / rotation operation for the crown 71 and a pressing operation for the push buttons 72 and 73.

The movement MM is a power mechanism that is accommodated in the accommodation space 24 and drives the radio-controlled timepiece 1. The movement MM includes a battery 8, a solar cell 9, a motor 10, a train wheel 11, a date wheel 12, a substrate 13, an antenna 14, a front-side magnetic-resistant plate 15, and a rear-side magnetic-resistant plate 16, and these are various. By being assembled to each other via the members of the above, one structural module is formed. In the accommodation space portion 24, the movement MM has a back side magnetic resistance plate 16, a substrate 13, and a front side magnetic resistance plate from the back side (back cover 22 side) to the front side (dial plate 4 side) along the axial direction X. It is arranged in the order of 15, day wheel 12, and solar cell 9. In the movement MM, the battery 8 is arranged adjacent to the front side of the back cover 22 in the axial direction X. Further, in the movement MM, the motor 10 and the antenna 14 are mounted on the mounting surface on the front surface side in the axial direction X of the substrate 13. Further, in the movement MM, a train wheel 11 is interposed between the motor 10 and the pointer 6, and these are connected via the wheel train 11.

The battery 8 is a power source for the radio-controlled clock 1 and is provided in the accommodation space portion 24. The battery 8 is, for example, a secondary battery such as a lithium ion battery, and is charged by the electric power generated by the solar cell 9 described later. In this embodiment, the battery 8 is formed in a substantially disk shape (button shape) centered on the battery center axis X4 (see also FIG. 4 and the like), and is formed on the front surface side of the back cover 22 in the axis direction X. They are arranged so that they are adjacent to each other. Here, the battery 8 is arranged so that the battery center axis X4 is parallel to the clock center axis X1 and is displaced from the clock center axis X1. The battery 8 is charged via the substrate 13 (or another substrate (not shown) by the electric power generated by the solar cell 9. The battery 8 supplies the stored electric power to each part of the radio-controlled clock 1 including the motor 10.

The solar cell 9 is a power source for the radio-controlled clock 1 and converts light energy into electrical energy. The solar cell 9 is provided in the accommodation space 24 on the back side of the dial 4 with respect to the axial direction X, in this case, between the dial 4 and the antenna 14. More specifically, the solar cell 9 is located on the foremost side of the axial direction X in the movement MM, and is provided between the dial 4 and the date wheel 12 with respect to the axial direction X. The solar cell 9 has a power generation main body 91 formed in a substantially disk shape centered on the clock center axis X1, and the power generation main body 91 converts light energy into electric energy. The electric power generated by the solar cell 9 may be directly supplied to each part of the radio-controlled clock 1, or may be supplied to the battery 8 to charge the battery 8. The solar cell 9 is provided with a sun window that penetrates the power generation main body 91 along the axial direction X at a position facing the sun window 42 of the dial 4 along the axial direction X in the power generation main body 91. ing. A part of the sun wheel 12 to be described later is exposed on the front side of the dial 4 through the sun window of the solar cell 9 and the sun window 42 of the dial 4.

The motor 10 is a power generation source for the radio-controlled clock 1, and generates power for operating each part. The motor 10 is provided on the back surface side of the dial 4 with respect to the axial direction X in the accommodation space portion 24. Here, the motor 10 is arranged on the front side of the substrate 13 in the axial direction X. As the motor 10, for example, a stepping motor can be used, and the stator 10b (also in FIG. 4) is generated by the magnetic field generated by the coil portion 10a (see also FIG. 4) according to the electric power supplied from the battery 8 or the solar cell 9. Rotational power is generated by rotating the rotor 10c (see FIG. 4) with respect to the rotor 10c (see FIG. 4), and the pointer 6, the date wheel 12, and the like are rotationally driven. The motor 10 may be provided individually for the plurality of pointers 6 and the day wheel 12, or may be shared by some of the pointers 6 and the day wheel 12.

The train wheel 11 is a mechanism for transmitting the rotational power generated by the motor 10 to the rotationally driven object. The rotationally driven object by the train wheel 11 is typically a pointer 6, but may include a date wheel 12. The train wheel 11 is provided on the back surface side of the dial 4 in the accommodation space portion 24 with respect to the axial direction X. The train wheel 11 is provided so as to be interposed between the motor 10 and the pointer 6 and to connect them. The train wheel 11 is configured to include a power transmission member such as a gear and a rotary shaft, and the final output rotary shaft 11a penetrates the dial 4 along the axial direction X and a pointer 6 is provided. The train wheel 11 decelerates the rotational power generated by the motor 10 and transmits the rotational power to the pointer 6 to rotate the pointer 6, thereby moving the pointer 6. The train wheel 11 may be provided individually for the plurality of pointers 6, or may be shared by some pointers 6.

The date wheel 12 is a display member that displays a date, and constitutes a clock operation unit. The day wheel 12 is rotatably provided in the accommodation space 24 with the day wheel rotation axis X5 parallel to the clock center axis X1 as the center of rotation. The date wheel 12 is provided on the back side of the dial 4 in the accommodation space portion 24 with respect to the axial direction X. More specifically, the date wheel 12 is provided between the solar cell 9 and the front-side magnetically resistant plate 15 in the accommodation space portion 24 with respect to the axial direction X. Here, at least a part of the date wheel 12 is located within the range of the antenna 14 with respect to the axial direction X, and at least a part thereof is arranged in substantially the same layer as the antenna 14. The date wheel 12 is formed in a substantially annular plate shape. The date wheel 12 is formed of an insulating material such as a synthetic resin. In the day wheel 12, a plurality of characters in a series of characters for identifying the calendar are formed at equal intervals in the circumferential direction. The day wheel 12 is rotationally driven by the motor 10 around the day wheel rotation axis X5 as the center of rotation, and displays the date by changing the position exposed from the day window 42.

The substrate 13 includes a wiring pattern made of a conductive member on the surface or inside, and is an electronic circuit, an oscillation circuit, a motor 10, an antenna 14, and a receiving circuit (a receiving circuit described later in FIG. 3) that collectively controls each part of the radio clock 1. Each part such as RX) is arranged. Here, the substrate 13 is formed in a substantially disk shape centered on the clock center axis X1 and has a notch portion corresponding to a region in which the battery 8 is arranged. The substrate 13 is provided on the back surface side of the dial 4 with respect to the axial direction X in the accommodation space portion 24. More specifically, the substrate 13 is provided between the front-side magnetic-resistant plate 15 and the back-side magnetic-resistant plate 16 in the accommodation space 24 with respect to the axial direction X. Here, the electronic circuit and the receiving circuit may be mounted on either the front surface or the back surface of the substrate 13, but the motor 10 and the antenna 14 are preferably arranged on the front surface side. The electronic circuit is configured to include various circuits for measuring the time (time inside the clock), controlling the motor 10 based on the time measured, rotating the pointer 6 and the date wheel 12, and moving the hands. The time is displayed on the pointer 6 and the day wheel 12 as the current time.

The antenna 14 receives radio waves from the outside of the outer case 2. The antenna 14 constitutes a communication antenna that receives electromagnetic waves (radio waves) in space. The antenna 14 is mounted on the mounting surface on the front side of the substrate 13 on the back side of the dial 4 with respect to the axial direction X in the accommodation space portion 24. Here, the antenna 14 is arranged outside the date wheel 12 with respect to the radial direction Y. The antenna 14 of the present embodiment will be described as an example of a planar monopole antenna.

Specifically, the antenna 14 of the present embodiment is configured to include, as an example, a dielectric 14a, a radiation electrode 14b, a short-circuit portion 14c, and a feeding portion 14d, as illustrated in FIG. The antenna 14 of the present embodiment constitutes a planar monopole antenna.

The dielectric 14a is a portion constituting the base of the antenna 14. The dielectric 14a is formed in a three-dimensional shape, here, a substantially rectangular parallelepiped shape. The dielectric 14a is formed of a substance having a higher dielectric property than conductivity, for example, a non-conductive ceramic or the like. The dielectric 14a is composed of a material having a high dielectric constant such as zirconia and titanium oxide, and has a wavelength shortening effect. The dielectric 14a can make the substantial wavelength λ'of the radio wave received by the radiation electrode 14b smaller than the wavelength λ according to the frequency of the GPS radio wave. Further, the dielectric 14a has an effect of separating the electric distance between the substrate 13 and the radiation electrode 14b.

The radiation electrode 14b is a portion that receives radio waves. The radiation electrode 14b is provided on the electrode arrangement surface 14e, which is the front surface (front surface) of the dielectric 14a. The radiation electrode 14b is a substantially rectangular flat plate-shaped component formed of a conductive material such as metal. The radiation electrode 14b is arranged on the electrode arrangement surface 14e so as to cover most of the area of the electrode arrangement surface 14e and expose the edge portion of the electrode arrangement surface 14e in a U shape. More specifically, the radiating electrode 14b is provided on the electrode arranging surface 14e in a positional relationship so as to expose a region on one end side in the radial direction Y on the electrode arranging surface 14e and a region on both ends in the width direction W. Here, the width direction W in the antenna 14 is a direction orthogonal to the axial direction X and the radial direction Y. The dielectric 14a of the present embodiment is formed in a substantially rectangular parallelepiped shape such that the radial direction Y is the direction along the short side and the width direction W is the direction along the long side. Each side of the radiation electrode 14b is parallel to each side of the electrode arrangement surface 14e. The radiation electrode 14b may be provided so that the electrode arrangement surface 14e is not exposed, that is, it covers the entire electrode arrangement surface 14e. Each side of the radiation electrode 14b may not be parallel to each side of the electrode arrangement surface 14e and may have a predetermined inclination. Each side of the radiation electrode 14b may have a meander shape instead of a straight line.

The radiation electrode 14b has a pair of first radiation sides 14f and a second radiation side 14g. The radiation side 14f is an edge portion where the current density is concentrated in the radiation electrode 14b of the antenna 14. The pair of radiating sides 14f are sides along the radial direction Y in the radiating electrode 14b, respectively. The pair of radiating sides 14f are parallel to each other or substantially parallel to each other. The radiation side 14g is a side substantially orthogonal to the radiation side 14f in the radiation electrode 14b, in other words, a side along the width direction W. The substantial antenna length of the radiating electrode 14b corresponds to the length of the side from the connection portion 14h with the short-circuited portion 14c to the radiating side 14g, in other words, the length of the radiating side 14f. The radiation electrode 14b is formed, for example, so that the antenna length is 1/4 of the substantially short wavelength λ'after shortening.

The short-circuit portion 14c is a portion that electrically connects the end portion of the radiation electrode 14b and the ground layer GND provided on the front surface side of the substrate 13. Here, the ground layer GND is electrically connected to the outer case 2 by direct contact or capacitive coupling. The ground layer GND is formed at a position facing the radiation electrode 14b along the axial direction X. The short-circuit portion 14c is provided on the side surface 14i on one side of the radial direction Y in the dielectric 14a. The side surface 14i is a surface of the dielectric 14a facing inward in the radial direction Y with the antenna 14 mounted on the substrate 13. The short-circuit portion 14c is a substantially rectangular flat plate-shaped constituent portion formed of a conductive material such as metal. The short-circuited portions 14c of the present embodiment are provided in pairs on the side surface 14i so as to expose both ends in the width direction W. The pair of short-circuited portions 14c are provided on the side surface 14i at intervals along the width direction W. Each short-circuited portion 14c extends from the upper end (front end) to the lower end (back end) of the side surface 14i along the axial direction X. The upper end of each short-circuited portion 14c is connected to the radiating electrode 14b via the connecting portion 14h, and is electrically connected to the radiating electrode 14b. The lower end of each short-circuited portion 14c is electrically connected to the ground layer GND.

The feeding portion 14d is a portion that feeds the radiation electrode 14b, and is a portion that electrically connects the end portion of the radiation electrode 14b and the receiving circuit RX. The feeding unit 14d of the present embodiment constitutes a direct feeding unit that supplies power to the radiation electrode 14b by direct feeding. The feeding portion 14d is provided on the same surface as the surface of the dielectric 14a on which the short-circuited portions 14c are provided, that is, on the side surface 14i. The feeding portion 14d is a substantially rectangular flat plate-shaped constituent portion formed of a conductive material such as metal. The feeding portion 14d of the present embodiment is provided between the pair of short-circuited portions 14c with respect to the width direction W. That is, the pair of short-circuited portions 14c described above are arranged side by side on both sides of the feeding portion 14d with the feeding portion 14d interposed therebetween in the width direction W on the side surface 14i. Similar to each short-circuited portion 14c, the feeding portion 14d extends from the upper end (front end) to the lower end (back end) of the side surface 14i along the axial direction X. The pair of short-circuited portions 14c and the feeding portion 14d extend along the virtual plane S1. The virtual plane S1 is a plane parallel to the clock center axis X1 of the outer case 2. Similar to each short-circuited portion 14c, the upper end of the feeding portion 14d is connected to the radiating electrode 14b via the connecting portion 14h, and is electrically connected to the radiating electrode 14b. Here, the pair of short-circuited portions 14c and the feeding portion 14d are connected to each other at the end portion on the radiation electrode 14b side, that is, the end portion on the connecting portion 14h side. The lower end of the feeding unit 14d is electrically connected to the receiving circuit RX. The feeding portion 14d has a depth (length along the axial direction X in FIG. 3) and a width (length along the width direction W in FIG. 3) of the slit SL formed by the feeding portion 14d and the pair of short-circuited portions 14c, respectively. Impedance matching is achieved by adjusting the above) and the like. Further, a matching circuit may be provided between the antenna 14 and the receiving circuit RX. In particular, regarding the connection between the feeding unit 14d and the receiving circuit RX, it is desirable to configure the microstrip line.

In the antenna 14 configured as described above, the short-circuit portion 14c and the feeding portion 14d face inward in the radial direction Y, and the surface of the dielectric 14a opposite to the radiation electrode 14b side is the ground layer GND of the substrate 13. It is mounted on the substrate 13 in a positional relationship such that it comes into contact with the substrate 13. At this time, the antenna 14 is provided so that the short-circuited portion 14c and the ground layer GND are conductive, while the feeding portion 14d and the ground layer GND are not conductive and are connected to the receiving circuit RX. In this state, the radiation electrode 14b extends from the pair of short-circuited portions 14c and the feeding portion 14d toward the outside in the radial direction Y. In other words, the radiation electrode 14b extends along the radial direction Y from the pair of short-circuited portions 14c and the feeding portion 14d toward the inner wall surface of the outer case 2. The feeding unit 14d and the radiation electrode 14b of the present embodiment are physically connected as described above. That is, the antenna 14 of the present embodiment is fed directly to the radiation electrode 14b via the feeding unit 14d. Here, since the central portion of the radiating side 14g in the width direction W is a portion where the fluctuation of the potential is smaller than the end portion of the width direction W adjacent to the radiating side 14f, it is compared with the end portion of the width direction W. Therefore, the influence on the reception sensitivity of the radiation electrode 14b tends to be relatively small. Here, in the antenna 14, each radiation side 14f, which tends to have a relatively large influence on the reception sensitivity of the radiation electrode 14b, is along the radial direction Y and at an angle close to perpendicular to the inner wall surface of the outer case 2. They are arranged in the accommodation space 24 in such a positional relationship that they intersect (see also FIG. 4). With this configuration, the antenna 14 can suppress capacitive coupling with the outer case 2, and can suppress a decrease in reception sensitivity. The ground layer GND extends to the inside of the radial direction Y from the antenna 14. In other words, the ground layer GND extends to the side opposite to the radiation electrode 14b side with the short-circuit portion 14c interposed therebetween in the radial direction Y. The radio-controlled clock 1 is configured as described above, and the area inside the antenna 14 in the radial direction is the so-called image antenna region. The image antenna is a virtual antenna and is paired with the antenna 14 which is a planar monopole antenna. It is considered that the image antenna is generated on the side opposite to the radiation electrode 14b side with each short-circuit portion 14c interposed therebetween. The image antenna is generated in a symmetrical shape at a position symmetrical to the antenna 14 with respect to each short-circuited portion 14c. The radio-controlled clock 1 can improve the reception sensitivity of the antenna 14 by the image antenna.

In the above description, the ground layer GND is arranged at a position facing the radiation electrode 14b on the front surface side of the substrate 13, but the ground layer GND may not be provided at a position facing the radiation electrode 14b. The reception sensitivity of the antenna 14 can be improved by separating the radiation electrode 14b and the ground layer GND. However, in order to electrically connect the short-circuited portion 14c and the ground layer GND, or to improve the mounting strength when mounting the antenna 14 on the substrate 13, the position of the substrate 13 facing the radiation electrode 14b. A ground layer GND may be provided in the vicinity of the short-circuit portion 14c. Further, a ground layer GND may be provided as a mounting area for the antenna 14 at other locations.

Returning to FIG. 2, the front-side magnetic-resistant plate 15 and the back-side magnetic-resistant plate 16 shield the external magnetic field from the outside of the outer case and prevent the coil portion of the motor 10 from being affected by the magnetic flux. It is a shielding plate (shield). The front-side magnetic-resistant plate 15 and the back-side magnetic-resistant plate 16 are formed in a plate shape by a conductive material such as metal. The front-side magnetic-resistant plate 15 constitutes a first magnetic-resistant plate provided in the accommodation space 24 on the back side of the date wheel 12 with respect to the axial direction X and on the front side of the motor 10. The front-side anti-magnetic plate 15 is located on the back side of the electrode arrangement surface 14e of the antenna 14 with respect to the axial direction X. The front-side anti-magnetic plate 15 is provided in a portion that does not overlap with the antenna 14 when viewed along the axial direction X (hereinafter, may be referred to as “axial direction view”, in other words, corresponds to “planar view”). ing. Here, the front-side magnetically resistant plate 15 is entirely located within the range of the antenna 14 with respect to the axial direction X, and is arranged in substantially the same layer as the antenna 14. On the other hand, the back-side magnetic-resistant plate 16 constitutes a second magnetic-resistant plate provided adjacent to the back cover 22 on the front side of the back cover 22 with respect to the axial direction X in the accommodation space portion 24. The back-side anti-magnetic plate 16 is located on the back side of the antenna 14 with respect to the axial direction X. The magnetic resistance plate 16 on the back side is provided at a portion that does not overlap with the battery 8 in the axial direction. The entire back-side magnetically resistant plate 16 is located within the range of the battery 8 with respect to the axial direction X, and is arranged in substantially the same layer as the battery 8. The front-side magnetic-resistant plate 15 and the back-side magnetic-resistant plate 16 are located so as to face each other with respect to the axial direction X with the motor 10 and the substrate 13 interposed therebetween. With these configurations, the radio-controlled clock 1 is made thinner while appropriately suppressing the influence of the external magnetic field on the coil portion of the motor 10. The front-side magnetic-resistant plate 15 and the back-side magnetic-resistant plate 16 are not limited to the above arrangement. For example, the magnetic resistance plate 16 on the back surface side may be provided at a portion overlapping the battery 8 in the axial direction, and may be arranged so as to cover the entire back surface side of the battery 8 in the axial direction X.

In the radio-controlled clock 1 configured as described above, the time (time inside the clock) is measured by an oscillation circuit and an electronic circuit, and the motor 10 is controlled based on the time, so that the pointer 6 and the rotation of the day wheel 12 are controlled. Will be done. As a result, the radio-controlled clock 1 can display the time, date, and the like according to the relative positional relationship between the pointer 6 and the date wheel 12 with respect to the dial 4. Further, the radio-controlled clock 1 receives radio waves including time information such as satellite radio waves via the antenna 14, and can correct the internal time of the clock based on the received radio waves by the receiving circuit and the electronic circuit.

As shown in FIG. 4, the radio-controlled clock 1 of the present embodiment has the first motor non-arranged region T1 inside the movement MM, thereby ensuring appropriate antenna sensitivity while suppressing the increase in size. There is.

Specifically, the first motor non-arrangement region T1 is a region set between the battery 8 and the antenna 14. The first motor non-arrangement region T1 is a region having a size in which the motor 10 can be arranged and at least the coil portion 10a of the motor 10 is not arranged. That is, the first motor non-arrangement region T1 is an region in which the coil portion 10a of the motor 10 is not intentionally arranged after the size in which the motor 10 can be arranged is secured between the battery 8 and the antenna 14. In other words, the battery 8 and the antenna 14 are arranged at intervals so as to secure a first motor non-arrangement region T1 having a size capable of arranging the motor 10. Here, the battery 8 and the antenna 14 are typically arranged at intervals of a length W1 or more in the lateral direction of the smallest motor 10 used in the radio-controlled clock 1, so that the first motor can be used. The non-arrangement area T1 is secured. In the radio-controlled clock 1, the first motor non-arrangement region T1 is set between the battery 8 and the antenna 14, so that a sufficient distance is secured between the antenna 14 and the metal such as the coil portion 10a of the motor 10. Therefore, it is possible to suppress a decrease in the reception sensitivity of the antenna 14. The first motor non-arrangement region T1 is at least a region where the coil portion 10a of the motor 10 is not arranged, but it is preferable that the entire motor 10 is not arranged. Here, the radio-controlled clock 1 includes four large and small motors 10, all of which are arranged outside the first motor non-arrangement region T1.

FIG. 5 is a schematic diagram showing a more detailed setting example of the first motor non-arrangement region T1. In the following, the first motor non-arrangement region T1 shown in FIG. 5 may be referred to as “first motor non-arrangement region T11” for convenience. In this example, the first motor non-arrangement region T11 is a region corresponding to a rectangular shape connecting the first reference point P11, the second reference point P12, the third reference point P13, and the fourth reference point P14. Set. The first reference point P11 is a point located at one end of the side L1 of the dielectric 14a of the antenna 14 on the battery 8 side in the axial direction. The second reference point P12 is a point located at the other end of the side L1 on the battery 8 side of the dielectric 14a of the antenna 14 in the axial direction. The third reference point P13 is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance from the first reference point P11 is the shortest. The fourth reference point P14 is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance from the second reference point P12 is the shortest. In this case, the radio-controlled clock 1 has a rectangular shape between the battery 8 and the antenna 14 according to the first reference point P11, the second reference point P12, the third reference point P13, and the fourth reference point P14. At least the coil portion 10a of the motor 10 is not arranged in the set first motor non-arrangement region T11.

Further, FIG. 6 is a schematic diagram showing another setting example of the first motor non-arrangement region T1. In the following, the first motor non-arrangement region T1 shown in FIG. 6 may be referred to as “first motor non-arrangement region T12” for convenience. In this example, the first motor non-arrangement region T12 is set as a region corresponding to a triangle shape connecting the first reference point P21, the second reference point P22, and the third reference point P23. The first reference point P21 is a point located at one end of the side L1 on the battery 8 side of the dielectric 14a of the antenna 14 in the axial direction. The second reference point P22 is a point located at the other end of the side L1 on the battery 8 side of the dielectric 14a of the antenna 14 in the axial direction. The third reference point P23 is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance of the radiation electrode 14b of the antenna 14 from the side L1 on the battery 8 side is the shortest. In this case, the radio-controlled clock 1 is a first motor set in a triangular shape between the battery 8 and the antenna 14 according to the first reference point P21, the second reference point P22, and the third reference point P23. At least the coil portion 10a of the motor 10 is not arranged in the non-arrangement region T12.

In the radio-controlled clock 1 described above, the motor 10 can be operated by the electric power of the battery 8 provided inside the outer case 2. Further, the radio-controlled clock 1 can receive radio waves from the outside by an antenna 14 provided inside the outer case 2. In this configuration, the radio-controlled clock 1 has a region between the battery 8 and the antenna 14, which is large enough to dispose the motor 10 and at least the coil portion 10a of the motor 10 is arranged inside the movement MM. It has a first motor non-arrangement region T1 (T11, T12) that is not. With this configuration, the radio-controlled clock 1 can secure a sufficient distance between the antenna 14 and the metal such as the coil portion 10a of the motor 10, so that the motor 10 has an influence on the reception sensitivity of the antenna 14. It can be suppressed, and the decrease in reception sensitivity can be suppressed. As a result, the radio-controlled clock 1 is arranged so that the battery 8, the motor 10, and the antenna 14 do not overlap each other in the axial direction, and is thinned, so that appropriate antenna sensitivity can be ensured.

Here, as an example, in the radio-controlled clock 1 described above, the first motor non-arrangement region T1 (T11) has a first reference point P11, a second reference point P12, a third reference point P13, and a fourth reference point. It may be set as an area corresponding to a rectangular shape connecting P14. In this case, the radio-controlled clock 1 can appropriately set the first motor non-arrangement region T1 as a region in which the motor 10 does not affect the reception sensitivity of the antenna 14. Therefore, in this case, the radio-controlled clock 1 can achieve both miniaturization and ensuring appropriate antenna sensitivity in a well-balanced manner. Further, in this case, since the radio-controlled clock 1 is set with the first motor non-arrangement region T11 with reference to the first reference point P11 and the second reference point P12 located at the corners of the dielectric 14a, the reception of the radiation electrode 14b is performed. In addition to ensuring the sensitivity, the wavelength shortening effect of the dielectric 14a can be surely secured.

As another example, in the radio-controlled clock 1 described above, the first motor non-arrangement region T1 (T12) is a triangle connecting the first reference point P21, the second reference point P22, and the third reference point P23. It may be set as an area according to the shape. In this case, the radio-controlled clock 1 sets the first motor non-arrangement region T1 as an region for the motor 10 not to affect the reception sensitivity of the antenna 14, and then sets the first motor non-arrangement region T1. It can be set as a more compact area. Therefore, in this case, the radio-controlled clock 1 can be further miniaturized while ensuring an appropriate antenna sensitivity. Further, in this case as well, the radio-controlled clock 1 is not the first motor with reference to the first reference point P21 and the second reference point P22 located at the corners of the dielectric 14a, similarly to the first motor non-arrangement region T11 described above. Since the arrangement region T12 is set, in addition to ensuring the reception sensitivity of the radiation electrode 14b, the wavelength shortening effect of the dielectric 14a can be surely secured.

Here, the radio-controlled clock 1 described above can secure good antenna sensitivity as described above in the antenna 14 constituting the planar monopole antenna.

The first motor non-arrangement region T1 described above is not limited to the first motor non-arrangement regions T11 and T12 described above, and for example, as shown in FIG. 7, the first motor non-arrangement region T11 is deformed. It may be the 1-motor non-arrangement region T11A, or it may be the 1st motor non-arrangement region T12A which is a modification of the 1st motor non-arrangement region T12 as shown in FIG.

The first motor non-arrangement region T11A shown in FIG. 7 is a region corresponding to a rectangular shape connecting the first reference point P11A, the second reference point P12A, the third reference point P13A, and the fourth reference point P14A. Set. The first reference point P11A is not the dielectric 14a of the antenna 14 but a point located at one end of the side L1 (here, the side constituting the connection portion 14h) on the battery 8 side of the radiation electrode 14b in the axial direction. Is. The second reference point P12A is a point located at the other end of the side L1 on the battery 8 side of the radiation electrode 14b of the antenna 14 in the axial direction. The third reference point P13A is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance from the first reference point P11A is the shortest. The fourth reference point P14A is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance from the second reference point P12A is the shortest. Similarly, the first motor non-arrangement region T12A shown in FIG. 8 is set as a region corresponding to a triangle shape connecting the first reference point P21A, the second reference point P22A, and the third reference point P23A. The first reference point P21A is a point located at one end of the side L1 on the battery 8 side of the radiation electrode 14b, not the dielectric 14a of the antenna 14, in the axial direction. The second reference point P22A is a point located at the other end of the side L1 on the battery 8 side of the radiation electrode 14b of the antenna 14 in the axial direction. The third reference point P23A is a point on the outer peripheral surface of the battery 8 in the axial direction, and is the point where the distance from the side L1 of the radiation electrode 14b of the antenna 14 on the battery 8 side is the shortest. When the first motor non-arrangement region T11A or the first motor non-arrangement region T12A as described above is applied as the first motor non-arrangement region T1, the radio-controlled clock 1 is located at the corner of the radiation electrode 14b. Since the first motor non-placement regions T11A and T12A are set with reference to the reference points P11A and P21A and the second reference points P12A and P22A, the first motor non-placement region T1 is set as a more compact region and at least radiates. The minimum reception sensitivity of the electrode 14b can be ensured. As a result, in the radio-controlled clock 1, for example, when the antenna 14 does not have the dielectric 14a, the radiation electrode 14b is formed on the entire surface of the electrode arrangement surface 14e, the motor 10 is difficult to arrange due to the design, and the like. Even so, the first motor non-arrangement region T1 can be appropriately set.

[Embodiment 2]
The radio-controlled clock according to the second embodiment is different from the first embodiment in that it has a second motor non-arranged region. In the following, the same components as those in the above-described embodiment are designated by a common reference numeral, and the common configurations, actions, and effects will be omitted as much as possible.

The radio-controlled clock 201 according to the present embodiment shown in FIG. 9 is different from the above-mentioned radio-controlled clock 1 in that it has a second motor non-arranged region T2 inside the movement MM in addition to the first motor non-arranged region T1. .. The other configurations of the radio-controlled clock 201 are substantially the same as those of the radio-controlled clock 1.

Specifically, the second motor non-arrangement region T2 is a region set around the antenna 14. The second motor non-arrangement region T2 is an end surface of the antenna 14 adjacent to the end surface 14j on the radiation side 14f side defined by the radiation electrode 14b, and is at least a region in which the coil portion 10a of the motor 10 is not arranged. .. Here, the end face 14j of the antenna 14 is an end face located on the radiation side 14f side, which tends to have a relatively large influence on the reception sensitivity of the radiation electrode 14b in the antenna 14. Here, the end faces 14j are a pair of end faces extending along the radial direction Y in the dielectric 14a of the antenna 14 and facing each other along the circumferential direction Z. The second motor non-arrangement region T2 is, for example, a region located on the opposite side of the battery 8 side with the boundary line L2 including the side L1 of the radiation electrode 14b of the antenna 14 on the battery 8 side as a boundary in the axial direction. Set. In other words, the second motor non-arrangement region T2 is a bow-shaped region surrounded by the boundary line L2 and the inner wall surface of the exterior case 2, and includes a region adjacent to the end surface 14j. Here, in the radio-controlled clock 201, all of the four large and small motors 10 are arranged outside the second motor non-arrangement region T2, similarly to the first motor non-arrangement region T1. In the radio-controlled clock 1, the coil portion of the motor 10 is located near each radiation side 14f, which tends to have a particularly large effect on the reception sensitivity of the antenna 14 because the second motor non-arrangement region T2 is set adjacent to the end face 14j. It is possible to suppress the proximity of metals such as 10a.

The second motor non-arrangement region T2 may be set in consideration of the first motor non-arrangement region T1 as shown in FIGS. 10 and 11. In the following, the second motor non-arrangement region T2 shown in FIG. 10 may be referred to as “second motor non-arrangement region T21” for convenience. Similarly, the second motor non-arrangement region T2 shown in FIG. 11 may be referred to as “second motor non-arrangement region T22” for convenience.

The second motor non-arrangement region T21 shown in FIG. 10 is partitioned by extension lines L3 and L4 extending from the boundary line that partitions the first motor non-arrangement region T11. Here, the extension line L3 is located on a straight line passing through the first reference point P11 and the third reference point P13 that define the first motor non-arrangement region T11 in the axial direction, and is the first reference. It is a straight line from the point P11 to the inner wall surface of the outer case 2. The extension line L4 is located on a straight line passing through the second reference point P12 and the fourth reference point P14 that define the first motor non-arrangement region T11 in the axial direction, and is from the second reference point P12. It is a straight line leading to the inner wall surface of the outer case 2. The second motor non-arrangement region T21 is a region surrounded by the side L1, the extension line L3, the extension line L4, and the inner wall surface of the exterior case 2 in the axial direction, and includes a region adjacent to the end surface 14j. The radio-controlled clock 201 is configured such that at least the coil portion 10a of the motor 10 is not arranged in the second motor non-arrangement region T21 set as described above.

The second motor non-arrangement region T22 shown in FIG. 11 is partitioned by extension lines L5 and L6 extending from the boundary line that partitions the first motor non-arrangement region T12. Here, the extension line L5 is located on a straight line passing through the first reference point P21 and the third reference point P23 defining the first motor non-arrangement region T12 in the axial direction, and is the first reference. It is a straight line from the point P21 to the inner wall surface of the outer case 2. The extension line L6 is located on a straight line passing through the second reference point P22 and the third reference point P23 that define the first motor non-arrangement region T12 in the axial direction, and is from the second reference point P22. It is a straight line leading to the inner wall surface of the outer case 2. The second motor non-arrangement region T22 is a region surrounded by the side L1, the extension line L5, the extension line L6, and the inner wall surface of the exterior case 2 in the axial direction, and includes a region adjacent to the end surface 14j. The radio-controlled clock 201 is configured such that at least the coil portion 10a of the motor 10 is not arranged in the second motor non-arrangement region T22 set as described above.

Like the radio-controlled clock 1, the radio-controlled clock 201 described above has the first motor non-arranged region T1 inside the movement MM, so that appropriate antenna sensitivity can be ensured.

Further, since the radio-controlled clock 201 described above has the second motor non-arrangement region T2 (T21, T22) adjacent to the end surface 14j of the antenna 14 inside the movement MM, the reception sensitivity is particularly affected by the antenna 14. It is possible to suppress the proximity of metal such as the coil portion 10a of the motor 10 to the vicinity of each radiation side 14f, which tends to have a large effect. As a result, the radio-controlled clock 201 can more reliably suppress the decrease in the reception sensitivity of the antenna 14.

Here, in the radio-controlled clock 201 described above, the second motor non-arrangement region T2 (T21, T22) is an extension line (L3) extended from the boundary line that divides the first motor non-arrangement region T1 (T11, T12). , L4, L5, L6). In this case, the radio-controlled clock 201 can be a series of easy-to-understand regions in which the first motor non-arranged region T1 and the second motor non-arranged region T2 are seamlessly connected, and the reception sensitivity of the antenna 14 is lowered. Can be suppressed more reliably.

The radio-controlled timepiece according to the embodiment of the present invention described above is not limited to the embodiment described above, and various modifications can be made within the scope described in the claims. The radio-controlled clock according to the present embodiment may be configured by appropriately combining the components of the embodiments and modifications described above.

If the second motor non-arrangement region T2 described above is an end surface of the antenna 14 and adjacent to the end surface 14j on the radiation side 14f side defined by the radiation electrode 14b, FIGS. 9 and 10 above. The shape is not limited to the shape described with reference to FIG. For example, the second motor non-arrangement region T2 has a rectangular shape connecting the first reference point P11, the second reference point P12, the third reference point P13, and the fourth reference point P14 in the axial direction. It may be a region partitioned by an extension line extending from the diagonal line of the corresponding first motor non-arrangement region T11 (see FIG. 10). That is, in this case, the second motor non-arrangement region T2 is located on a straight line passing through the first reference point P11 and the fourth reference point P14 in the axial direction, for example, and the exterior case 2 is located from the first reference point P11. The extension line leading to the inner wall surface of the outer case 2, the extension line extending from the second reference point P12 to the inner wall surface of the exterior case 2, the side L1, located on a straight line passing through the second reference point P12 and the third reference point P13, and It may be an area surrounded by the inner wall surface of the outer case 2. Further, the combination of the first motor non-arrangement region T1 and the second motor non-arrangement region T2 is not limited to the above combination. For example, the first motor non-arrangement region T11 of FIG. 5 and the second motor non-arrangement region T2 of FIG. 9 may be combined, or the first motor non-arrangement region T12 of FIG. 6 and the second motor non-arrangement of FIG. It may be combined with the region T2. Similarly, any one of the first motor non-arrangement region T11A in FIG. 7, the first motor non-arrangement region T12A in FIG. 8, the second motor non-arrangement region T2 in FIG. 9, and the second motor non-arrangement region T21 in FIG. It may be combined with any of the second motor non-arrangement regions T22 of FIG.

Non-conductive parts and substrates such as gears and date wheels made of a plastic material can be arranged in the first motor non-arrangement region T1 and the second motor non-arrangement region T2 described above. Here, the board may be a board 13 on which the antenna 14 is mounted, or at least a part of a board on which other electronic circuits, wiring, and the like are arranged may be arranged. In particular, the ground layer GND of the antenna 14 is arranged at least in a part of the portion where the substrate 13 on which the antenna 14 is mounted overlaps with the first motor non-arrangement region T1 and the second motor non-arrangement region T2 in the axial direction. Alternatively, the receiving circuit RX may be arranged. Here, the wiring connecting the antenna 14 and the receiving circuit RX may deteriorate the receiving sensitivity due to the long wiring length, and the conductive parts arranged around the wiring also affect the sensitivity deterioration. There is a risk. On the other hand, in the radio clocks 1 and 201, the receiving circuit RX is placed in the vicinity of the antenna 14 and in the first motor non-arranged region T1 and the second motor non-arranged region T2 in which the motor 10 which is a conductive component is not arranged. By mounting it in the above, it is possible to suppress the deterioration of sensitivity.

In the above description, the antenna 14 has been described as constituting a planar monopole antenna, but the present invention is not limited to this. As the antenna 14, various shapes other than those exemplified as the shape of the planar monopole antenna can be adopted. In the above description, the feeding unit 14d has been described as constituting a direct feeding unit that supplies power to the radiation electrode 14b by direct feeding, but the present invention is not limited to this. For example, the antenna 14 may constitute a so-called electromagnetically coupled planar monopole antenna. In this case, the feeding unit 14d constitutes an electromagnetic feeding unit that supplies power to the radiation electrode 14b by electromagnetic coupling. That is, in the antenna 14, the feeding portion 14d and the radiating electrode 14b are not physically in contact with each other and are separated from each other, and the feeding portion 14d and the radiating electrode 14b are electromagnetically coupled to each other so as not to contact the radiating electrode 14b. The power supply of the method is made.

Further, in the above description, the feeding portion 14d has been described as being provided on the side surface 14i in which the short-circuited portions 14c are provided in the dielectric 14a, but the present invention is not limited to this. The feeding portion 14d may be provided on a surface different from the side surface 14i where each short-circuit portion 14c is provided. For example, the feeding portion 14d may be provided on a surface facing the side surface 14i of the dielectric 14a, that is, on the outer side surface in the radial direction Y. It may be provided. Further, the arrangement relationship between the short-circuited portion 14c and the feeding portion 14d may be reversed. Further, in the above description, the dielectric 14a has been described as being formed in a substantially rectangular parallelepiped shape, but the present invention is not limited to this. Further, the radiation electrode 14b described above may extend to a surface other than the electrode arrangement surface 14e in the dielectric 14a. Further, the antenna 14 may be a so-called patch antenna (planar antenna), an inverted F-type antenna, or a coil antenna.

Further, in the above description, the reception target of the antenna 14 is assumed to be a GPS radio wave, but the present invention is not limited to this. The reception target of the antenna 14 may be a radio wave output from a satellite other than a GPS satellite, or may be a radio wave using Bluetooth (registered trademark), Wi-Fi (registered trademark), or NFC. Further, the reception target of the antenna 14 may be a radio wave output from a base station or the like on the ground.

Further, in the above description, it has been described that the date wheel 12 arranges the date wheel rotation axis X5 parallel to the clock center axis X1 so as to be the rotation center, but the present invention is not limited to this. The date wheel rotation axis may be the same as the clock center axis X1. Further, the antenna 14 and a part of the date wheel 12 may be arranged so as to overlap each other in the axial view.

In the above description, the main body 21 of the exterior case 2 has been described as being formed in a substantially cylindrical shape centered on the timepiece center axis X1, but the present invention is not limited to this. The main body portion 21 may have, for example, a substantially rectangular tubular shape, a substantially barrel-shaped tubular shape, or the like. In this case, the clock center axis X1 is set as an axis passing through the geometric center of gravity of the shape of the movement MM and the outer case 2 in the axial direction as described above.

In the above description, the radio-controlled clocks 1 and 201 have been described as being analog electronic clocks that display the time by the physical pointer 6, but the present invention is not limited to this. The radio-controlled clocks 1 and 201 may be, for example, digital electronic clocks that display the time by a liquid crystal display or the like. Further, the radio-controlled clocks 1 and 201 have been described as being wristwatches worn on the wrist via the belt 25, but the present invention is not limited to this. The radio clocks 1 and 201 may be, for example, a table clock, a wall clock, a pocket watch, or the like. Further, the radio clocks 1 and 201 are used in, for example, various cameras, game devices, mobile phones, PDAs (Personal Digital Assistants), portable information terminal devices such as notebook personal computers, and electronic devices including home appliances and automobiles. It may be applicable.

1,201 radio clock 2 exterior case 8 battery 10 motor 10a coil part 10b stator 10c rotor 14 antenna 14a dielectric 14b radiation electrode 14f, 14g radiation side 14j end face L1 side L2 boundary line L3, L4, L5, L6 extension line P11, P11A, P21, P21A 1st reference point P12, P12A, P22, P22A 2nd reference point P13, P13A, P23, P23A 3rd reference point P14, P14A 4th reference point T1, T11, T11A, T12, T12A 1st motor Non-arranged area T2, T21, T22 2nd motor Non-arranged area MM Movement W Width direction X Axis direction Y Radial direction Z Circumferential direction X1 Clock center axis X2 Main hand rotation axis X3 Secondary hand rotation axis X4 Battery center axis X5 Battery rotation Axis line

Claims (6)

With the outer case
A battery provided inside the outer case, a motor provided inside the outer case and operable by the electric power of the battery, and a radio wave provided inside the outer case to receive radio waves from the outside of the outer case. With a movement that is configured to include an antenna,
The antenna has a radiation electrode that receives radio waves.
The movement includes a first motor non-arrangement region , which is an region between the battery and the antenna and has a size capable of arranging the motor and at least the coil portion of the motor is not arranged, and the antenna. It has a second motor non-placement region which is adjacent to the end face on the radiation side defined by the radiation electrode and at least the coil portion of the motor is not arranged .
The first motor non-arrangement region is secured by arranging the battery and the antenna at intervals equal to or greater than the minimum length of the motor in the lateral direction .
The second motor non-arrangement region is located on the side opposite to the battery side with a boundary line including the side of the radiation electrode on the battery side as a boundary, and is surrounded by the boundary line and the inner wall surface of the exterior case. Characterized by the fact that it is an area
Radio clock. The antenna has a dielectric and is
The first motor non-arrangement region is a first reference point located at one end of the side of the dielectric on the battery side, a second reference point located at the other end of the side, and a point on the battery. Corresponding to a rectangular shape connecting a third reference point having the shortest distance to the first reference point and a fourth reference point which is a point on the battery and has the shortest distance to the second reference point. Area,
The radio-controlled timepiece according to claim 1. The antenna has a dielectric and is
The first motor non-arrangement region is a first reference point located at one end of the side of the dielectric on the battery side, a second reference point located at the other end of the side, and a point on the battery. It is a region corresponding to a triangle shape connecting the third reference point having the shortest distance to the side.
The radio-controlled timepiece according to claim 1. The first motor non-arrangement region is a first reference point located at one end of the side of the radiation electrode on the battery side, a second reference point located at the other end of the side, and a point on the battery. Yes Corresponds to the rectangular shape connecting the third reference point, which has the shortest distance to the first reference point, and the fourth reference point, which is a point on the battery and has the shortest distance to the second reference point. Area,
The radio-controlled timepiece according to claim 1. The first motor non-arrangement region is a first reference point located at one end of the side of the radiation electrode on the battery side, a second reference point located at the other end of the side, and a point on the battery. Yes, it is a region corresponding to the triangular shape connecting the third reference point, which has the shortest distance to the side.
The radio-controlled timepiece according to claim 1. The antenna is a planar monopole antenna.
The radio-controlled timepiece according to any one of claims 1 to 5 .

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