JP2006115186A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus equipped with an antenna located in an apparatus case and improved in radio wave receiving sensitivity. <P>SOLUTION: A wrist watch 100 is equipped with the antenna 5 which is arranged in the watch case 2 and provided with a core 5a of amorphous metal and a coil 5b wound on the core 5a, and both the end faces 53 and 53 of the core 5a are set exposed to the outside appearing out of the watch case 2. By this setup, radio waves are caught direct by the end faces 53 and 53 without being interrupted by the watch case 2, so that the wrist watch 100 surely and effectively receives radio waves. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electronic device.

Conventionally, a built-in antenna receives a radio wave carrying a standard time signal generated by a cesium atomic clock (hereinafter referred to as “standard radio wave”), and analyzes the time information by the standard radio signal inside the clock. A radio-controlled timepiece is widely known as a clock that corrects and records accurate time.
An antenna for receiving standard radio waves includes a magnetic core and a coil wound around the core. Then, a current is generated in the coil by passing a magnetic flux (hereinafter referred to as a “signal magnetic flux”) generated by a magnetic field (hereinafter referred to as a “signal magnetic field”) generated by a standard radio wave through the coil, thereby correcting the time.
In order to reliably receive the signal with the standard time signal, it is necessary to increase the reception sensitivity of the standard radio wave by the antenna. To increase the reception sensitivity, the cross-sectional area at both ends of the core is increased to increase the reception frequency. An antenna that allows a signal magnetic flux to pass through a coil is known (for example, see Patent Document 1).
Here, when a signal magnetic flux passes through the coil of the antenna, a current flows in the coil in a direction that prevents the change of the signal magnetic flux, and the current causes a magnetic flux in the direction opposite to the signal magnetic flux (hereinafter referred to as “generated magnetic flux”). ) Occurs. When this generated magnetic flux penetrates a metal body located in the vicinity of the antenna, a current called an eddy current flows in a concentric shape perpendicular to the magnetic flux. It is known that when an eddy current is generated in a metal body, heat is released due to the electric resistance of the metal body and energy is lost.
JP 55-91237 A

  In the antenna described in Patent Document 1, when a device case for housing the antenna is made of metal, a metal as a conductor is disposed in the vicinity of the antenna. For this reason, an eddy current is generated in the device case when the signal magnetic flux passes through the coil, and the energy is consumed as a heat loss by the eddy current, and there is a problem that the reception sensitivity of the antenna is lowered.

  Therefore, an object of the present invention is to provide an electronic device that can improve the reception sensitivity of an antenna in a device case.

  In order to solve the above-described problems, the invention described in claim 1 includes a core (for example, the core 5a in FIGS. 1 and 2) and a coil wound around the core (for example, the coil 5b in FIGS. 1 and 2). In an electronic device (for example, the wristwatch 100 in FIGS. 1 to 5) in which an antenna (for example, the antenna 5 in FIGS. 1 and 2) is disposed in a device case (for example, the watch case 2 in FIGS. 1 and 2), the core Both end surface portions (for example, the end surface portion 53 of FIGS. 3 and 5) are exposed to the outside from the device case.

  According to a second aspect of the present invention, in the electronic device according to the first aspect, the area of the both end surface portions is formed larger than the cross-sectional area of the central portion of the core (for example, the central portion 51 in FIG. 5). It is characterized by becoming.

  According to a third aspect of the present invention, in the electronic device according to the first or second aspect (for example, the wristwatch 300 in FIG. 9), a band (for example, a figure) is provided at both ends of the core (for example, the core 305a in FIG. 9). 9 band 1B) for attaching a band attaching portion (for example, band attaching portion 302B in FIG. 9).

  According to a fourth aspect of the present invention, in the electronic device according to the first or second aspect (for example, the watch 500 of FIG. 12), the device case (for example, the watch case 502 of FIG. 12) has a band (for example, FIG. A band mounting portion (for example, band mounting portion 502B in FIG. 12) to which the band is attached, and both end surface portions (for example, end surface portion 553 in FIG. 12) of the core are attached to the band mounting portion. It is characterized by facing.

  According to a fifth aspect of the present invention, in the electronic device according to any one of the first to fourth aspects (for example, the wristwatch 600 of FIG. 14), the core (for example, the core 605a of FIG. 14) is the device. A first magnetic member (for example, the first magnetic member 615 of FIG. 14) disposed inside a case (for example, the watch case 602 of FIG. 14) and a second magnetic member that is exposed from the device case. A magnetic member (for example, the second magnetic member 625 in FIG. 14) and a connecting member (for example, the connecting member 635 in FIG. 14) that is made of a magnetic material and connects the first magnetic member and the second magnetic member. ).

  A sixth aspect of the present invention is the electronic device according to any one of the first to fifth aspects (for example, the wristwatch 100 of FIG. 1), wherein the core is made of an amorphous metal.

   According to the first aspect of the present invention, since both end surfaces of the core that captures the radio wave are exposed to the outside from the device case, the radio waves can be directly captured by the both end surfaces without being blocked by the device case. Thus, radio waves can be received efficiently and reliably. Thereby, the receiving sensitivity of the antenna in the device case can be improved.

  According to the second aspect of the present invention, the area of the both end faces of the core that captures radio waves is larger than the cross-sectional area of the central part of the core, so that the radio wave reception sensitivity can be further improved. In addition, since the receivable directions increase, the directivity can be relaxed, and radio waves can be received more efficiently and reliably.

  According to the invention of claim 3, the band is connected to the band mounting portion of the core, and even if the appearance of the core and the device case is different, without making the difference stand out, The core can be exposed without impairing the appearance.

   According to the invention described in claim 4, since both end surface portions of the core exposed to the outside from the device case are opposed to the band attached to the band attaching portion, the core is attached by attaching the band to the band attaching portion. Even if the external appearance of the core and equipment case is different, the core is exposed without impairing the appearance, even if the external appearance of the core and the equipment case is different. Can be made.

   According to the fifth aspect of the present invention, since the core is formed by connecting the first magnetic member and the second magnetic member with the connecting member across the device case, the structural design compared to the single core As a result, the design can be improved and the structure can be kept more confidential with the equipment case.

  According to the invention described in claim 6, since the core is formed of an amorphous metal, the core has high strength and magnetic permeability, so that radio waves can be captured more reliably.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(Embodiment 1)

  FIG. 1 is a plan view showing a schematic configuration of a wristwatch according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a right side view of the wristwatch of FIG. FIG. 4 is a cross-sectional view of the vicinity of the end surface taken along line IV-IV in FIG.

As shown in FIGS. 1 and 2, a wristwatch 100 as an electronic device exemplified as Embodiment 1 to which the electronic device of the present invention is applied includes a built-in antenna 5 and a radio wave (hereinafter, referred to as time information) related to standard time. "Standard radio wave") is received and the display time is corrected.
The wristwatch 100 is provided with a metal watch case 2 as a device case for housing the clock timing unit 1 therein, and a watch glass 2a is attached to the upper center of the watch case 2 via a packing 2b.
Further, a back cover 2c is attached to the lower surface of the watch case 2 via a waterproof ring 2d, and a buffer member 2e is provided between the clock timing unit 1 and the back cover 2c.

  The clock timing unit 1 includes an upper housing portion 1a, a lower housing portion 1b, an analog pointer mechanism 4 for moving the hands 4b such as an hour hand and a second hand on the dial 3, an antenna 5 for receiving a standard radio wave, an analog pointer mechanism 4 and an antenna. The circuit board 6 which connects 5 and controls these is provided. Further, the lower housing part 1b, the upper housing part 1a, and the dial plate 3 have a structure in which each peripheral part is attached to an inner frame 2f provided on the inner peripheral surface of the watch case 2, and the lower housing part 1b, the upper housing part 1a, and the part of the middle frame 2f corresponding to the location of the antenna 5 are notched, and a storage space for the antenna 5 is secured.

  The lower housing portion 1b is supported above a buffer member 2e provided on the upper portion of the back cover 2c, and a circuit board 6 is disposed between the lower housing portion 1b and the upper housing portion 1a. Further, the dial 3 is disposed on the upper surface of the upper housing portion 1a.

  An analog pointer mechanism 4 is provided in the upper housing part 1a. The analog pointer mechanism 4 has a pointer shaft 4a extending upward from a shaft hole 3a formed in the dial plate 3, and pointers 4b such as an hour hand and a minute hand attached to the pointer shaft 4a. Move the hand above 3. A battery (not shown) for operating the analog pointer mechanism 4 is incorporated in the lower housing portion 1b, for example.

The watch case 2 includes a case main body 2A having a substantially cylindrical shape, and band attaching portions 2B and 2B formed to protrude outward from side surfaces of the case main body 2A in the 6 o'clock direction and the 12 o'clock direction, respectively. ing.
Two rectangular cutouts 20A and 20A opened to the bottom surface are formed on the side surface of the case body 2A.
The notches 20A and 20A are formed on the side surface of the case main body 2A so as to face each other with the band attaching portion 2B interposed therebetween. Further, the notch 20A is provided at a position closer to the band attaching portion 2B on the 12 o'clock side than the band attaching portion 2B on the 6 o'clock side.
The band attaching portions 2B and 2B are attached to the wrist 100 by attaching the band 1B between the two pin fixing portions 102P and 102P and the pin fixing portions 102P and 102P facing each other at an interval of 3 o'clock to 9 o'clock. A band fixing pin 2P that can be attached to the housing is provided, and a substantially rectangular penetrating opening 30A is formed in a region surrounded by the pin fixing portion 102P, the band fixing pin 2P, and the case body 2A.

The antenna 5 is provided in the upper housing part 1a, and as shown in FIGS. 1 and 2, the antenna 5 includes a magnetic core 5a and a coil 5b wound around the core 5a.
FIG. 5 is a schematic cross-sectional view taken along line VV in FIG. As shown in FIG. 5, the core 5 a includes, for example, a substantially quadrangular prism-shaped central portion 51 located at the longitudinal central portion of the core 5 a, and end portions 52 and 52 provided at both end portions of the central portion 51. It has.
The end portion 52 has a shape that increases in width from the boundary surface with the central portion 51 in plan view, and the outer shape of the end surface portion 53 of the end portion 52 is provided in the watch case 2. The shape of the cutout portion 20A substantially coincides with the end surface portion 53, which has a curved surface having the same curvature as the outer peripheral surface of the case main body 2A.
In addition, as shown in FIG. 4, the end 52 is located in the inner space of the case main body 2A in a side view and has a thickness substantially the same as the central portion 51, and the portion overlapping the case main body 2A is As the end face part 53 is approached, the thickness increases. That is, the cross-sectional area of the end portion 52 is formed so as to increase as the portion overlapping the case main body 2 </ b> A approaches the end surface portion 53. Therefore, the area of the end surface portion 53 of the core 5 a is formed to be larger than the cross-sectional area of the central portion 51.

The antenna 5 is provided in the upper housing portion 1a so that the axis of the core 5a is parallel to the back cover 2c (or the dial plate 3) between the lower housing portion 1b and the dial plate 3.
Further, the antenna 5 is arranged inside the watch case 2 so that the end surface portion 53 of the antenna 5 is fitted into the cutout portion 20A. That is, both end surface portions 53 of the core 5a are arranged so as to be exposed from the watch case 2 to the outside. Then, by providing the insulating material 2h between the end portion 52 located in the notch portion 20A and the back cover 2c, the end surface portion 53 and the case main body 2A do not form a continuous curved surface, and the end portion 52 The side surface of the wristwatch 100 is configured so as not to be short-circuited by a conductor composed of the case body 2A so as to be short-circuited in a high-frequency manner (alternating current). The insulating material 2h is in contact with the back cover 2c and has a waterproof effect. Moreover, as the insulating material 2h, for example, vinyl chloride, polyethylene, or ethylene propylene materials can be used.

For the core 5a, it is preferable to use a ferromagnetic material having a high magnetic permeability because of the property of magnetic flux that gathers in a place where the magnetic resistance is small. Examples of the ferromagnetic material include ferrite and amorphous metal. Among these, amorphous metal is more preferable because it has high magnetic permeability and high strength. The amorphous metal may be a laminate of a plurality of thin films, but from the viewpoint of the degree of freedom of the shape of the core 5a, an amorphous metal formed in a bulk shape is more preferable.
Specifically, the bulk amorphous metal is, for example, an Fe-based alloy, a Pd-based alloy, a Zr-based alloy, a Ni-based alloy, or the like, and the Fe-based alloy includes Fe-MB (M = Cr, W , Ta, Nb, Hf, Zr) type alloy, Fe—Co—RE—B (RE = Nb, Sm, Tb, Dy) type alloy and the like. More specifically, the amorphous metal has a composition such as Pd ₄₀ Cu ₃₀ Ni ₁₀ P ₂₀ or Fe ₈₁ B ₁₃ Si ₁₄ C ₂ . And when the melted alloy is processed into a bulk shape by casting, for example, the internal structure is made amorphous.
Here, by forming the core 5a from an amorphous metal, for example, even if the central portion 51 is made thinner than the ferrite core, the strength equal to or higher than that can be obtained.

  The coil 5b is made of a conductor that transmits electricity, and for example, a copper wire can be used. In each drawing, the diameter of the coil 5b is increased and the number of turns is reduced to simplify the explanation, but the diameter and the number of turns of the coil 5b can be set as appropriate.

Next, the magnetic flux generated in the antenna 5 when the antenna 5 is placed in a magnetic field by a standard radio wave (hereinafter referred to as “signal magnetic field”) will be described with reference to FIG. FIG. 6 is a diagram for explaining the action of the signal magnetic flux in the antenna.
When the antenna 5 is placed in the signal magnetic field so that the axis of the core 5a is parallel to the signal magnetic field direction, the magnetic flux (hereinafter referred to as “signal magnetic flux”) M1 due to the signal magnetic field is shown in FIG. It concentrates on the core 5a having a higher magnetic permeability than the space.
By concentrating the signal magnetic flux M1 on the core 5a, the signal magnetic flux M1 is linked to the coil 5b, and the coil 5b follows the Lenz's law in a direction that prevents the signal magnetic flux M1 from being generated inside the coil 5b (hereinafter referred to as a magnetic flux). This is referred to as “generated magnetic flux.”) An induced electromotive force V that generates M2 is generated.

  The induced electromotive force V generated in the coil 5b is detected by a receiving circuit (not shown) connected to the coil 5b. The receiving circuit (not shown) includes a tuning capacitor (not shown) and a loss resistor (not shown) for tuning to the frequency (40 kHz or 60 kHz) of a standard radio wave to be received. The receiving circuit (not shown) is mounted on the circuit board 6, for example.

  The generated magnetic flux M2 generated by the induced electromotive force V generates a magnetic field around the core 5a. This magnetic field reaches a metal body located near the antenna 5, that is, the watch case 2, and generates an eddy current in the watch case 2.

  FIG. 7 is a block diagram showing the internal configuration of the wristwatch. As shown in FIG. 7, the wristwatch 100 includes a CPU (Central Processing Unit) 61, a RAM (Random Access Memory) 62, a ROM (Read Only Memory) 63, an input unit 64, a display unit 65, a radio wave receiver 66, a time code. A conversion unit 67, a clock circuit unit 68, an oscillation circuit unit 69, and the like are provided. These parts except for the oscillation circuit part 69 are connected by a bus 6B, and the oscillation circuit part 69 is connected to a clock circuit part 68.

The CPU 61 reads out a program stored in the ROM 63 in accordance with a predetermined timing or an operation signal input from the input unit 64 and develops it in the RAM 62, and sends instructions and data to each unit constituting the wristwatch 100 based on the program. Perform forwarding, etc. Specifically, for example, the radio wave receiving device 66 is controlled at predetermined intervals to execute standard radio wave reception processing, and based on the standard time code (not shown) input from the time code conversion unit 67, the time measuring circuit unit 68 Correct the current time data counted in.
The RAM 62 is used as a work area for the CPU 61, and temporarily stores programs read from the ROM 63, data processed by the CPU 61, and the like.
The ROM 63 stores system programs and application programs for the wristwatch 100, programs and data for realizing the present embodiment, and the like.

The input unit 64 is a switch 2g for supporting the execution of various functions of the wristwatch 100, and outputs a corresponding operation signal to the CPU 61 when these switches 2g are operated.
The display unit 65 includes the dial plate 3 and the analog pointer mechanism 4 controlled by the CPU 61, and displays the current time output from the clock circuit unit 68.

The radio wave receiving device 66 includes an antenna 5 and a receiving circuit (not shown), cuts out unnecessary frequency components of the standard radio wave received by the antenna 5 and takes out the corresponding frequency signal. The signal is converted into a signal, and the signal is output to the time code converter 67.
The time code conversion unit 67 converts the electric signal input from the radio wave receiving device 66 into a digital signal, and generates a standard time code including data necessary for a clock function such as a standard time code, an integration code, and a day code. It outputs to CPU61.
The clock circuit unit 68 calculates the current time based on the signal input from the oscillation circuit unit 69 and outputs the calculated current time to the CPU 61. The oscillation circuit unit 69 is a circuit that always outputs a clock signal having a constant frequency.

According to the wristwatch 100 described above, since both end surface portions 53 and 53 of the core 5a for capturing standard radio waves are exposed to the outside from the watch case 2, the standard radio waves can be directly captured by the both end surface portions 53 and 53. Thus, the standard radio wave can be received efficiently and reliably.
In addition, since the area of the both end faces 53 and 53 of the core 5a that captures the standard radio wave is larger than the cross-sectional area of the central part 51 of the core 5a, the reception sensitivity of the standard radio wave can be improved. Since the possible directions increase, the directivity can be relaxed.
Therefore, the energy loss due to the eddy current generated in the vicinity of the antenna 5 by receiving the standard radio wave can be compensated, and the time can be corrected with high accuracy.
Furthermore, by forming the core 5a from an amorphous metal, the core 5a has high strength and magnetic permeability, and radio waves can be captured more reliably. Furthermore, by forming the core 5a from bulk amorphous metal, the degree of freedom in forming the core 5a can be increased.

Although the core 5a is substantially symmetrical with respect to the center in the length direction, the core 5a may be asymmetrical as long as the end surface portion 53 is exposed from the watch case 2.
Further, in the present embodiment, as shown in FIG. 3, the end surface portion 53 is exposed to the outside by notching a part of the watch case 2, and the end portion 52 and the back cover 2c located in the notch portion 20A. An insulating material 2h was provided between the two. This is because, when the end face portion 53 is exposed by scoring a part of the watch case 2 made of metal, the metal that circulates the scoring through part is contacted with the revolving part of the end 52 by alternating current. This is because it is difficult to properly receive the received radio wave because a short circuit (short state) occurs. Therefore, when the timepiece case is formed of a non-conductive material (for example, resin), the end surface portion 53 may be exposed by punching through the timepiece case. Further, the end face portion 53 may be exposed through the metal watch case 2 by performing appropriate processing such as prevention of an alternating short circuit.
Further, the insulating material 2h is provided only between the end portion 52 located in the notch 20A and the back cover 2c. However, for example, an insulating ring can be provided on the entire contact surface between the end portion 52 and the watch case 2. .
(Embodiment 2)

  Next, a wristwatch 200 according to Embodiment 2 for carrying out the present invention will be described. FIG. 8 is a schematic cross-sectional view of a wrist watch 200 as a second embodiment to which the present invention is applied. In describing the wristwatch 200, the same components as those of the wristwatch 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 8, a watch case 202 of a wristwatch 200 includes a case main body 202A having a substantially cylindrical shape, and band attachments that protrude outward from the side surfaces of the case main body 202A in the 6 o'clock direction and the 12 o'clock direction. It is configured to include the sections 2B and 2B.
Two rectangular notches 220A and 220A that open to the bottom surface are formed on the side surface of the case body 202A. The notches 220A and 220A are provided at positions substantially opposite to each other with the band attaching portion 2B interposed therebetween.

The antenna 205 of the wristwatch 200 includes a magnetic core 205a and a coil 5b wound around the core 205a. The core 205 a includes a substantially quadrangular columnar central portion 51 that is located at the longitudinal central portion of the core 205 a and end portions 252 and 252 provided at both end portions of the central portion 51.
The end portion 252 includes a widened portion 252a having a width that widens from the boundary surface with the central portion 51 in plan view, and an extended portion 252b that further extends in the 6 o'clock direction at the tip of the widened portion 252a. It has. Further, the outer shape of the end surface portion 253 of the end portion 252 substantially matches the shape of the notch portion 220A provided in the watch case 202, and the surface of the end surface portion 253 is a curved surface having the same curvature as the outer peripheral surface of the case main body 202A. It has become.
The cross-sectional area of the end portion 252 is formed so as to increase as the distance from the central portion 51 increases, that is, as the end surface portion 253 is approached. Accordingly, the area of the end surface portion 253 of the core 205 a is formed to be larger than the cross-sectional area of the central portion 51.

  The antenna 205 is disposed inside the watch case 202 so that the end 252 of the antenna 205 is fitted into the notch 220A. That is, both end surface portions 253 and 253 of the core 205a are disposed so as to be exposed from the watch case 202 to the outside. The side surface of the wristwatch 200 is formed by the end surface portion 253 and the case main body 202A forming a continuous curved surface.

Of course, according to the wristwatch 200, the same effect as that of the wristwatch 1 can be obtained. Since the antenna 205 has the extended portion 252b, the antenna 205 has a case compared to the antenna 5 of the first embodiment. The area exposed from the main body 202A can be increased. Therefore, the area of the both end surface portions 253 of the core 205a that captures the standard radio wave is formed to be sufficiently larger than the cross-sectional area of the central portion 51, and the reception sensitivity of the antenna 205 can be further improved. In addition, the receivable directions are greatly expanded, and the directivity can be further relaxed.
(Embodiment 3)

  Next, a wristwatch 300 according to Embodiment 3 for carrying out the present invention will be described. FIG. 9 is a schematic cross-sectional view of a wrist watch 300 as a third embodiment to which the electronic apparatus of the invention is applied. In describing the wristwatch 300, the same components as those of the wristwatch 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 9, the watch case 302 of the wristwatch 300 includes a case main body 302A having a substantially cylindrical shape.
Two rectangular cutouts 320A and 320A opened to the bottom surface are formed on the side surface of the case main body 302A. The notches 320A and 320A are respectively provided at positions in the band attaching direction including the 6 o'clock direction and the 12 o'clock direction in the case main body 302A.

The antenna 305 of the wristwatch 300 includes a magnetic core 305a and a coil 5b wound around the core 305a. The core 305a includes a substantially quadrangular columnar central portion 51 located at the center portion in the longitudinal direction of the core 305a, and end portions 352 and 352 provided at both end portions of the central portion 51.
The end portion 352 extends from both ends of the central portion 51 toward the outside in the longitudinal direction so as to expand in a substantially triangular shape in plan view, and extends from the widened portion 352a toward the outside in the longitudinal direction of the core 305a. In addition, a rectangular portion 352b extending in a substantially rectangular shape in plan view, and two pin fixing portions that protrude from the rectangular portion 352b to the outside in the longitudinal direction of the core 305a and face each other at an interval of 3 o'clock to 9 o'clock 302P and 302P. The vertical cross-sectional shape of the rectangular portion 352b substantially matches the shape of the cutout portion 320A. Accordingly, the area of the end surface portion 353 of the core 305 a is formed to be larger than the cross-sectional area of the central portion 51.
A band fixing pin 2P is attached between the pin fixing portions 302P and 302P so that the wristwatch 300 can be attached to the wrist by attaching the band 1B. The band fixing pin 302P and the band fixing pin 2P are used to attach the band. Part 302B is configured. Then, a substantially rectangular penetrating opening 330A is formed in a region surrounded by the pin fixing portion 302P, the band fixing pin 2P, and the rectangular portion 352b.

  The antenna 305 is disposed inside the watch case 302 at a position where the end portion 352 of the antenna 305 is fitted into the notch portion 320A and the rectangular portion 352b of the end portion 352 protrudes from the case main body 302A. That is, both end surface portions 353 and 353 of the core 305a are disposed so as to be exposed from the watch case 302 to the outside.

  FIG. 10 shows a schematic diagram of the signal magnetic flux passing through the core 305a of the antenna 305. The signal magnetic flux M1 enters the core 305a from the end surface portion 353 and passes through the core 305a. At this time, the generated magnetic flux M2 is generated in the core 305a by the induced electromotive force V generated in the coil 5b. An eddy current is generated in the nearby watch case 302 by the generated magnetic flux M2.

Of course, according to the wristwatch 300, the same effect as that of the wristwatch 100 can be obtained. The antenna 305 can connect the band 1B to the band fixing pins 2P provided at both ends of the core 305a. Thus, even if the appearance of the core 305a and the watch case 302 is different, the appearance can be ensured without making the difference stand out. High reception sensitivity can be realized.
(Embodiment 4)

  Next, a wrist watch 400 according to Embodiment 4 for carrying out the present invention will be described. FIG. 11 is a schematic cross-sectional view of a wrist watch 400 as a fourth embodiment to which the electronic apparatus of the invention is applied. In describing the wristwatch 400, the same components as those of the wristwatch 300 according to the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIG. 11, the watch case 402 of the wristwatch 400 includes a case main body 402A having a substantially cylindrical shape.
Two rectangular notches 420A and 420A that open to the bottom surface are formed on the side surface of the case main body 402A. The notches 420A and 420A are provided at positions of the 6 o'clock direction and the 12 o'clock direction in the case main body 402A, respectively.

The antenna 405 of the wristwatch 400 includes a magnetic core 405a and a coil 5b wound around the core 405a. The core 405a includes a substantially quadrangular columnar central portion 51 located at the longitudinal center portion of the core 405a, and end portions 452 and 452 provided at both end portions of the central portion 51.
The end portion 452 extends from both sides of the central portion 51 toward the outside in the longitudinal direction with a widened portion 452a extending in a substantially triangular shape in plan view, and toward the 3 o'clock and 9 o'clock directions at the tip of the widened portion 452a. Each of the extended portions 452b and 452b, a rectangular portion 452c extending in a substantially rectangular shape further outward in the longitudinal direction of the widened portion 452b, and protruding outward in the longitudinal direction of the core 405a from the rectangular portion 452c. Two pin fixing portions 402P and 402P that face each other at an interval in the 9 o'clock direction are provided. Therefore, the area of the end surface portion 453 of the core 405 a is formed to be larger than the cross-sectional area of the central portion 51.
The outer shapes of the extending portions 452b and 452b substantially match the shape of the notch portion 420A provided in the watch case 402, and the outer surfaces of the extending portions 452b and 452b are curved surfaces having the same curvature as the outer peripheral surface of the case main body 402A. It has become.
A band fixing pin 2P is attached between the pin fixing portions 402P and 402P so that the wristband 400 can be attached to the wrist by attaching the band 1B. The band fixing pin 2P and the band fixing pin 2P are used to attach the band. Part 402B is configured. Then, a substantially rectangular penetrating opening 430A is formed in a region surrounded by the pin fixing portion 402P, the band fixing pin 2P, and the rectangular portion 452c.

  The antenna 405 is inserted into the watch case 402 at a position where the extended portion 452b of the end portion 452 of the antenna 405 is fitted into the notch 420A so that the extended portion 452b continuously forms a curved surface with the side surface of the case main body 402A. Thus, the rectangular portion 452c is disposed at a position protruding from the case main body 402A.

Of course, according to the wristwatch 400, the same effect as that of the wristwatch 100 can be obtained. The antenna 405 can connect the band 1B to the band fixing pin 2P, so that the exposed portion of the core 405a is connected to the band mounting portion 402B. Even if the appearances of the core 405a and the watch case 402 are different, it is possible to realize high reception sensitivity while ensuring the appearance without making the difference stand out. it can.
Furthermore, since the antenna 405 includes the extended portion 452b at the end 452, the area exposed from the case main body 402A can be increased as compared with the antenna 305 of the third embodiment. Therefore, the area of the both end surface portions 453 of the core 405a that captures the standard radio wave is formed to be sufficiently larger than the cross-sectional area of the central portion 51, and the reception sensitivity of the antenna 405 can be further improved. In addition, the receivable directions are greatly expanded, and the directivity can be further relaxed.
(Embodiment 5)

  Next, a wrist watch 500 according to a fifth embodiment for carrying out the present invention will be described. FIG. 12 is a schematic cross-sectional view of a wrist watch 500 as a fifth embodiment to which the electronic apparatus of the invention is applied. 13 is a cross-sectional view taken along line XIII-XIII in FIG. In describing the wristwatch 500, the same components as those of the wristwatch 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIGS. 12 and 13, a watch case 502 of a wrist watch 500 is formed by a case main body 502A having a substantially cylindrical shape and a band formed by projecting from the side surface of the case main body 502A in the 6 o'clock direction and the 12 o'clock direction, respectively. The mounting portion 502B is provided.
Two rectangular cutouts 520A and 520A that open to the bottom surface are formed on the side surface of the case body 502A.
The band attaching portions 502B and 502B are attached to the wrist 500 by attaching the band 1B between the two pin fixing portions 502P and 502P and the pin fixing portions 502P and 502P facing each other at an interval of 3 o'clock to 9 o'clock. A band fixing pin 2P that can be attached to the housing is provided, and a substantially rectangular penetrating opening 530A is formed in a region surrounded by the pin fixing portion 502P, the band fixing pin 2P, and the case body 502A. The cutout portion 520A is formed at the base portion of the band attachment portion 502B in the case main body 502A and is provided so as to face the opening 530A of the band attachment portion 502B.

The antenna 505 includes a magnetic core 505a and a coil 5b wound around the core 505a. The core 505 a includes a substantially quadrangular columnar central portion 51 that is located in the longitudinal central portion of the core 505 a and end portions 552 and 552 provided at both end portions of the central portion 51.
The end portion 552 is bent slightly at the 3 o'clock direction at the boundary surface with the central portion 51, and is bent at a base portion of the band attachment portion 502B in a direction substantially parallel to the axial direction of the coil 5b. Further, the area of the end surface portion 553 of the end portion 552 is formed to be larger than the cross-sectional area of the central portion 51. Further, by providing an insulating material 502h between the end portion 552 located at the notch 520A and the back cover 2c, the end surface portion 553 and the case main body 502A do not form a continuous curved surface, and the end portion 552. The wristwatch 500 is configured so that it is not circulated by a conductor made up of the case main body 502A and short-circuited in a high-frequency manner (alternating current). The insulating material 502h is in contact with the back cover 2c and has a waterproof effect. In addition, as the insulating material 502h, for example, a vinyl chloride-based material, a polyethylene-based material, or an ethylene-propylene-based material can be used.

The antenna 505 is disposed so that the end portion 552 is fitted into the notch 520A of the watch case 502 and the end surface portion 553 is exposed to the opening 530A.
Therefore, when the band 1B is attached to the band fixing pin 2P of the band attaching portion 502B, the band 1B and the end surface portion 553 exposed facing the opening 530A face each other.

Of course, according to the wristwatch 500, the same effect as that of the wristwatch 100 can be obtained, and the antenna 505 is opposed to the band 1B having the end surface portion 553 attached to the band fixing pin 2P. By attaching the band 1B to the both ends 553 and 553 of the core 505a are obstructed by the band 1B and difficult to see from the outside, and even when the appearance of the core 505a and the watch case 502 is different, The core 505a can be exposed without conspicuous the difference and without impairing the appearance.
(Embodiment 6)

  Next, a sixth embodiment for carrying out the present invention will be described. FIG. 14 is a schematic cross-sectional view of a wristwatch 600 as a sixth embodiment to which the electronic apparatus of the invention is applied. 15 is a cross-sectional view taken along line XV-XV in FIG. In describing the wristwatch 600, the same components as those of the wristwatch 100 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

As shown in FIGS. 14 and 15, the watch case 602 of the wristwatch 600 is formed to project outward from the case main body 602A having a substantially cylindrical shape and the side surfaces of the case main body 602A in the 6 o'clock direction and the 12 o'clock direction. A band mounting portion 602B is provided.
Two rectangular cutout portions 620A and 620A that open to the bottom surface are formed on the side surface of the case main body 602A.
The band attaching portions 602B and 602B are arms for holding the wristwatch 600 by attaching the band 1B between the two pin fixing portions 602P and 602P facing each other at an interval of 3 o'clock and 9 o'clock and the pin fixing portions 602P and 602P. A band fixing pin 2P that can be attached to the housing is provided, and a substantially rectangular penetrating opening 630A is formed in a region surrounded by the pin fixing portion 602P, the band fixing pin 2P, and the case body 602A.

The antenna 605 includes a magnetic core 605a and a coil 5b wound around the core 605a.
Further, the core 605a includes a first magnetic member 615 disposed inside the watch case 602, a second magnetic member 625 disposed exposed from the watch case 602, the first magnetic member 615, and the second magnetic member 615. The magnetic member 625 is connected to the magnetic member 625 in a contact state, and a connection member 635 made of a magnetic material is provided.
The first magnetic member 615 is provided at a substantially square columnar central portion 615a located at a substantially central portion, and at both ends of the central portion 615a, and bends obliquely in the direction of 3:00 to 9:00 at the boundary surface with the central portion 615a. And it is comprised by the bending part 615b, 615b bent in the direction substantially parallel to the longitudinal direction of the center part 615a in the base part of the band attachment part 602B. A screw hole 615c through which the connecting member 635 is passed is provided at the end of the bent portion 615b.
The second magnetic member 625 has a substantially rectangular parallelepiped shape, and the cross-sectional area thereof is larger than the cross-sectional area of the bent portion 615b of the first magnetic member 615. A screw hole 615d corresponding to the screw hole 615c of the bent portion 615b is provided on the contact surface of the second magnetic member 625 that contacts the first magnetic member 615 facing the opening 630A. Then, the coupling member 635 is inserted through the screw hole 615c of the first magnetic member 615 and inserted into the screw hole 615d of the second magnetic member 625, whereby the first magnetic member 615, the second magnetic member 625, and the like. Are connected in contact with each other.
That is, the end portion 652 of the core 605a is configured by the bent portion 615b of the first magnetic member 615, the second magnetic member 625, and the connecting member 635. Further, the end surface portion 653 of the end portion 652 is configured by the outer surface of the second magnetic member 625 facing the opening 630A. Therefore, the area of the end surface portion 653 is formed to be larger than the cross-sectional area of the central portion 51.

Further, by providing an insulating material 602h between the end portion 652 located at the notch 620A and the back cover 2c, the end surface portion 653 and the case main body 602A do not form a continuous curved surface, and the end portion 652 is provided. The wristwatch 600 is configured so that the watch 600 is not circulated by a conductor composed of the case main body 602A and short-circuited in a high-frequency manner (alternating current). The insulating material 602h is in contact with the back cover 2c and has a waterproof effect. As the insulating material 602h, for example, vinyl chloride, polyethylene, or ethylene propylene materials can be used.
The first magnetic member 615, the second magnetic member 625, and the connecting member 635 may be any magnetic material, and may be different types of members having different magnetic permeability, for example. Moreover, as a connection member, a volt | bolt, a screw | thread, etc. can be used, for example, The member which has a suitable connection function can be used suitably.

  Of course, according to the wristwatch 600, the same effect as that of the wristwatch 1 can be obtained. In the antenna 605, the first magnetic member 615 and the second magnetic member 625 are connected by the connecting member 635 with the watch case 602 interposed therebetween. Since the cores 605a are connected to each other, the degree of freedom in structural design can be increased as compared with a single core, so that the design can be improved or the confidentiality with the watch case 602 can be maintained. be able to.

(Modification)
A watch 700 which is a modification of the sixth embodiment is shown in FIGS. FIG. 16 is a schematic cross-sectional view of a wrist watch 700. 17 is a cross-sectional view taken along line XVII-XVII in FIG. Components similar to those of the sixth embodiment are denoted by reference numerals and description thereof is omitted.

The antenna 705 includes a magnetic core 705a and a coil 5b wound around the core 705a.
The core 705a includes a first magnetic member 715 disposed inside the watch case 602, a second magnetic member 725 disposed exposed from the watch case 602, the first magnetic member 715, and the second magnetic member. A connecting member 635 made of a magnetic material that is connected to the member 725 in contact with the member 725 is provided.
The first magnetic member 715 is provided at a substantially quadrangular columnar central portion 715a located at a substantially central portion, and at both ends of the central portion 715a, and bends obliquely in the direction of 3:00 to 9:00 at the boundary surface with the central portion 715a. And it is shape | molded by the bending part 715b bent in the direction substantially parallel to the longitudinal direction of the center part 715a in the base part of the band attachment part 602B. A screw hole 715c for allowing the connecting member 635 to pass therethrough is provided at the end of the bent portion 715b.
A screw hole 715d corresponding to the screw hole 715c of the bent portion 715b is provided on the contact surface of the second magnetic member 725 that contacts the first magnetic member 715 facing the opening 630A. Then, the coupling member 635 is inserted through the screw hole 715d of the second magnetic member 715 and inserted into the screw hole 715c of the first magnetic member 715, whereby the first magnetic member 715, the second magnetic member 725, and the like. Are connected in contact with each other.
That is, the end portion 725 of the core 705 a is configured by the bent portion 715 b of the first magnetic member 725, the second magnetic member 725, and the connecting member 635. The end surface portion 753 of the end portion 752 is configured by the outer surface of the second magnetic member 725 provided in the opening 730A. Therefore, the area of the end surface portion 753 is formed to be larger than the area of the central portion 715a.

In addition, by providing an insulating material 602h between the end 752 positioned at the notch 620A and the back cover 2c, the end surface 753 and the case main body 602A do not form a continuous curved surface. The side surface of the wristwatch 700 is configured so that 752 is circulated by a conductor made up of the case main body 702A and is not short-circuited in terms of high frequency (alternating current). As the insulating material 602h, for example, vinyl chloride, polyethylene, or ethylene propylene materials can be used.
According to the wristwatch 700, it is needless to say that the same effect as that of the wristwatch 600 can be obtained, and the connecting member 635 can be fastened from the second magnetic member 725 side constituting the core 705a. Attaching work can be performed more easily.
In the embodiment of the present invention, the case where the electronic device is applied to a wristwatch-type radio timepiece has been described. However, the application of the present invention is not limited to this. For example, the present invention may be applied to an in-vehicle electronic device or a portable wireless terminal.
The core material in the second to sixth embodiments is the same as the material in the first embodiment.

It is a top view which shows schematic structure in the wristwatch of Embodiment 1 of this invention. It is sectional drawing in the II-II line of FIG. 3 is a right side view of the wristwatch of Embodiment 1. FIG. It is sectional drawing of the end surface part vicinity in the IV-IV line of FIG. It is sectional drawing in the VV line | wire of FIG. It is a figure for demonstrating the effect | action of the signal magnetic flux in the antenna of FIG. FIG. 3 is a block diagram showing an internal configuration of the wristwatch according to the first embodiment. It is sectional drawing equivalent to FIG. 5 in the wristwatch of Embodiment 2 of this invention. It is sectional drawing equivalent to FIG. 5 in the wristwatch of Embodiment 3 of this invention. It is a figure for demonstrating the effect | action of the signal magnetic flux in the antenna of FIG. It is sectional drawing equivalent to FIG. 5 in the wristwatch of Embodiment 4 of this invention. It is sectional drawing equivalent to FIG. 5 in the wristwatch of Embodiment 5 of this invention. It is sectional drawing in the XIII-XIII line | wire of FIG. It is sectional drawing equivalent to FIG. 5 in the wristwatch of Embodiment 6 of this invention. It is sectional drawing in the XV-XV line | wire of FIG. FIG. 10 is a cross-sectional view corresponding to FIG. 5 in a wristwatch according to a modification of the sixth embodiment. It is sectional drawing in the XVII-XVII line of FIG.

Explanation of symbols

1B Band 2, 202, 302, 402, 502, 602 Watch case 2A, 202A, 302A, 402A, 502A, 602A Case body 2B, 302B, 402B, 502B, 602B Band mounting portion 20A, 220A, 320A, 420A, 520A, 620A Notch 30A, 330A, 430A, 530A, 630A, 730A Opening 5, 205, 305, 405, 505, 605, 705 Antenna 5a, 205a, 305a, 405a, 505a, 605a, 705a Core 5b Coils 51, 615a, 715a Central portion 52, 252, 352, 452, 552, 652, 752 End portion 53, 253, 353, 453, 553, 653, 753 End surface portion 615, 715 First magnetic member 625, 725 Second magnetic member 635 Connecting member 00,200,300,400,500,600,700 watch

Claims (6)

In an electronic device in which an antenna including a core and a coil wound around the core is arranged in a device case,
An electronic apparatus, wherein both end surfaces of the core are exposed to the outside from the apparatus case.   2. The electronic device according to claim 1, wherein an area of the both end surface portions is formed larger than a cross-sectional area of a central portion of the core.   The electronic device according to claim 1, further comprising a band attaching portion for attaching a band to both ends of the core. The device case includes a band attaching portion for attaching a band,
The electronic device according to claim 1, wherein both end surface portions of the core are opposed to a band attached to the band attaching portion. The core is
A first magnetic member disposed inside the device case;
A second magnetic member disposed to be exposed from the device case;
The electronic apparatus according to claim 1, further comprising: a connecting member that is made of a magnetic material and connects the first magnetic member and the second magnetic member.   The electronic device according to claim 1, wherein the core is made of an amorphous metal.

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