JP2008177820A - Antenna device, electronic equipment, and manufacturing method of antenna device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reception sensitivity while decreasing the number of components. <P>SOLUTION: Disclosed is an antenna device 18 mounted on electronic equipment. This antenna device 18 has a core 24, a coil 23 wound around the core 24, and a pair of decorative components 25 coupled via the core 24. Then the core 24 and the pair of decorative components 25 are integrally molded of a magnetic material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an antenna device, an electronic apparatus, and a method for manufacturing the antenna device.

Conventionally, in order to increase the reception sensitivity of radio waves transmitted from the outside, the reception area at both ends of the core is increased, more magnetic flux is guided to the core, and a large electromotive force is generated by the coil wound around the core. An antenna device has been developed (see Patent Document 1).
JP 55-91237 A

However, in the case of increasing the reception area at both ends of the core as described above, it is difficult to dramatically improve the reception sensitivity because the core has the same shape.
An object of the present invention is to further improve reception sensitivity while reducing the number of parts.

The invention according to claim 1 is an antenna device mounted on an electronic device.
A core, a coil wound around the core, and a pair of decorative parts connected via the core;
The core and the decorative part are integrally formed of a magnetic material.

The invention according to claim 2 is the antenna device according to claim 1,
The decorative part is any one of a dial plate, a ring member, and a name plate.

The invention according to claim 3 is the antenna device according to claim 1 or 2,
And an equipment case on which the antenna device is mounted.

The invention according to claim 4 is the electronic device according to claim 3,
The device case further includes a built-in component disposed in a state where at least a part of the device case is visible through a slit formed between the pair of decorative components.

A method for manufacturing an antenna device according to a fifth aspect of the present invention includes:
A molding step of molding a core around which a coil is wound and a pair of decorative parts connected via the core from a single magnetic member;
A winding step of winding a coil on the core formed by the forming step;
And a processing step of forming the decorative part by processing the pair of decorative parts.

A method for manufacturing an antenna device according to a sixth aspect of the present invention includes:
A processing step of forming a processing portion into a single magnetic member;
A molding step of molding a core around which a coil is wound and a pair of decorative parts connected via the core, along the outline of the processed portion, of the single magnetic member,
And a winding step of winding a coil on the core formed by the forming step.

The invention according to claim 7 is the method of manufacturing the antenna device according to claim 5 or 6,
It is characterized by further comprising a bending step of bending both ends of the core after the winding step.

  According to the present invention, since the core and the decorative part are integrally formed of a magnetic material, the number of parts can be reduced and the receiving sensitivity can be improved.

[First embodiment]
FIG. 1 is a front view showing a schematic configuration of a radio-controlled wristwatch provided with an antenna device according to the present invention. FIG. 2 is a back view showing the inside of the back surface of the radio wristwatch shown in FIG. 1 with the back cover removed. FIG. 3 is a longitudinal sectional view showing the internal structure of the radio-controlled wristwatch.
As shown in FIGS. 1 to 3, the radio-controlled wristwatch 100 is provided with a device case 2 made of metal such as stainless steel or titanium in which a clock unit 1 is mounted. A watch band 3 is attached to the end portion on the 12 o'clock side and the end portion on the 6 o'clock direction of the device case 2. A plurality of operation buttons 4 are provided on the outer peripheral portion of the device case 2 for various operation instructions such as a time adjustment instruction.

  A watch glass 5 is attached to the viewing side (front side) of the device case 2 via a waterproof packing P so as to close the opening 21 on the viewing side. Further, a dial 6 as a magnetic decorative part is disposed on the side (back side) opposite to the position of the watch glass 5. The dial 6 is formed of a magnetic plate material. The dial 6 will be described later in detail.

  Between the watch glass 5 and the dial 6 in the device case 2, pointers 8 such as an hour hand and a minute hand attached to the pointer shaft 7 are provided, and these hands 8 are provided on the back side of the dial 6. The hand movement mechanism 9 is moved.

  A back cover 11 that closes the opening 22 on the back side of the device case 2 is attached to the back side of the device case 2 via a waterproof ring 10.

  The clock timing unit 1 includes an upper housing 12 disposed between the opening 21 on the viewing side of the device case 2 and the back cover 11 and a lower housing 13 disposed on the back side of the upper housing 12. It has been. The upper housing 12 and the lower housing 13 are molded by molding, and fix and hold various components.

The upper housing 12 is molded from a predetermined synthetic resin that does not block radio waves.
The lower housing 13 incorporates a battery 16 for supplying power to each part of the radio-controlled wristwatch 100. Further, the rear surface side of the lower housing 13 is covered with a housing fixing member 17 for fixing the lower housing 13.

  A circuit board 19 is interposed between the upper housing 12 and the lower housing 13. The circuit board 19 is connected to a reception control circuit (not shown) that adjusts the time by the received radio wave, and each part of the radio wave wristwatch 100 such as the hand movement mechanism unit 9 and the antenna device 18. In addition, an antenna space 20 in which a core 24 (described later) of the antenna device 18 is accommodated is formed in a 12 o'clock direction portion between the upper housing 12 and the lower housing 13.

  Hereinafter, the antenna device 18 will be described. 4A and 4B are explanatory views showing a schematic configuration of the antenna 30 constituting the antenna device 18, wherein FIG. 4A is a perspective view, FIG. 4B is an enlarged view of the arc S in FIG. 4A, and FIG. It is AA sectional drawing.

  As shown in FIG. 4, the antenna 30 includes a core 24 and a coil 23. The core 24 is formed integrally with the dial 6. More specifically, the dial 6 is provided with a core 24 around which a coil 23 such as a copper wire is wound, and a pair of decorative parts 25 for receiving radio waves. The decorative part 25 is continuous from both ends of the core 24 and extends so that the width H2 is wider than the width H1 of the core 24.

The core 24 is provided with a coil covering portion 26 covered with the wound coil 23 and a connecting portion 27 for connecting the decorative component 25 so as to be continuous with both ends of the coil covering portion 26. The connecting portion 27 is not covered with the coil 23.
Here, at least the surface layer portion of the coil covering portion 26 of the core 24 is coated with, for example, a fluororesin (non-conductive resin) having a thickness of about 20 to 30 μm in order to ensure insulation with the coil 23. Yes.
Further, as shown in FIG. 4C, the connecting portion 27 is bent into a substantially S shape or a substantially inverted S shape so that the coil covering portion 26 is located on the back side of the pair of decorative parts 25.

  The pair of decorative parts 25 is formed in a circular shape on the entire outer periphery via the core 24. A slit 28 is formed between the pair of decorative parts 25. An arc-shaped notch 29 for penetrating the pointer shaft 7 is formed at a substantially central portion of the slit 28 in the pair of decorative parts 25.

  The dial 6 is formed of amorphous so that the core 24 and the pair of decorative parts 25 are integrated.

  The coil 23 is wound around the coil covering portion 26 so as to have a substantially uniform thickness, and both end portions 31 thereof are connected to a coil connecting portion (not shown) on the circuit board 19.

Next, a method for manufacturing the antenna device 18 will be described with reference to the flowchart of FIG. 5 and FIGS.
First, in step S1 of FIG. 5, as shown in FIG. 6, the base member 51 that is the base of the dial 6 is punched from a plate material 50 made of a magnetic material and molded (molding process) as shown in FIG. Both ends of the basic member 51 are formed in a semicircular shape, and these both ends become a pair of decorative parts 25. Further, the portion connecting the pair of decorative components 25 is the core 24. As shown in FIG. 6, the width H <b> 1 of the core 24 is formed to be narrower than the width H <b> 2 of the decorative part 25.

  In step S2, as shown in FIG. 7, the time letters 54 are formed on the front side of the base member 51 so that the gap between the decorative parts 25 is along the 12: 00-6 o'clock direction.

  In step S3, as shown in FIG. 8, the coil 23 is uniformly wound so as not to cover both ends 55 of the core 24, and the antenna 30 having the foundation member 51 as a core is created (winding step). 8A shows a state at the start of winding, and FIG. 8B shows a state at the completion of winding. When the winding process is completed, a portion of the core 24 around which the coil 23 is wound becomes the coil covering portion 26, and both end portions 55 where the coil 23 is not wound are connected to both ends of the coil covering portion 26 and the decorative component 25. It becomes the connection part 27 to connect.

  After the winding step, a bending step is performed in which the connecting portion 27 of the core 24 is bent so that the core 24 of the base member 51 is located on the back side of the decorative component 25. At the time of this bending process, a bending tool is executed by attaching a dedicated jig to the press machine. Hereinafter, the bending process will be specifically described.

  First, FIG. 9 is an explanatory view showing a state in which a jig is attached to the press machine, where (a) shows before pressing and (b) shows after pressing. The press machine 60 includes a first holding jig 61 for holding the base member 51 with the connecting portion 27 of the base member 51 interposed therebetween, and a decorative part of the base member 51 in conjunction with the press operation of the press machine 60. There is provided a first pressing jig 62 that presses 25 downward and bends the connecting portion 27.

  In step S4, the base member 51 around which the coil 23 is wound is held by the first holding jig 61 as shown in FIG. As a result, the decorative part 25 of the base member 51 is positioned below the first holding jig 61.

  In step S5, when the press machine 60 is operated, the first pressing jig 62 is lowered in conjunction with the pressing operation as shown in FIG. 9B. By this lowering, the first pressing jig 62 presses the decorative part 25 of the base member 51 downward and bends the connecting portion 27 in the vertical direction.

  In step S <b> 6, the first holding jig 61 and the first pressing jig 62 are removed from the press machine 60 and replaced with different jigs. FIG. 10 is an explanatory view showing a state in which another jig is attached to the press machine. Specifically, the press machine 60 includes a second pressing jig 63 that presses the lower portion of the connecting portion 27 inward in conjunction with the pressing operation, and a portion pressed by the second pressing jig 63. A second holding jig 64 for holding the base member 51 is attached so that the upper side is not bent. The second holding jig 64 holds the base member 51 by sandwiching a portion of the connecting portion 27 adjacent to the coil 23 up and down.

In step S <b> 7, the base member 51 is held by the second holding jig 64.
In step S8, when the press machine 60 is operated, the second pressing jig 63 slides inward in conjunction with the pressing operation. By this sliding, the second pressing jig 63 presses the lower portion of the connecting portion 27 of the base member 51 inward as shown in FIG. 10, and the connecting portion 27 is substantially S-shaped or substantially inverted S-shaped. Bend it. Thereby, the bending process is completed. After the bending process, the decorative part 25 of the dial plate 6, that is, the pair of decorative parts 25, forms a circle on the entire outer periphery thereof.
In step S9, the base member 51 is removed from the jig.

  In step S10, predetermined processing (for example, springback processing, burr processing, coloring processing, etc.) is performed on the pair of decorative components 25 (processing step), and the dial 6 including the core 24 of the antenna 30 is completed.

Next, the operation of this embodiment will be described.
When the radio wave passes through the watch glass 5 from the watch glass 5 side, it is received by the decorative component 25 of the dial 6. Thereby, a magnetic flux is generated in the coil covering portion 26 of the dial 6, and an induced electromotive force is generated in the coil 23. The induced electromotive force is transmitted from the coil 23 to the reception control circuit on the circuit board 19, and the current time is corrected according to the standard time data included in the dielectric electromotive force.

Here, the voltage of the induced electromotive force tends to increase with an increase in the number of stacked radio wave reception units and the reception area, but the reception area has higher increase efficiency than the number of stacked layers. For this reason, if the core 24 and the decorative component 25 of the antenna device 18 are connected and the area of the decorative component 25 is increased as in the present embodiment, the step of laminating and the adhesive for the lamination are unnecessary. As a result, it is possible to increase the reception sensitivity efficiently.
Further, since the core 24 of the antenna 30 is molded from the dial 6, it is possible to mold the projected area of the core over a wider range than before, and it is possible to efficiently increase reception sensitivity without stacking. Become. Therefore, it is possible to improve the reception sensitivity while reducing the number of parts.

  And since the core 24 of the dial 6 is arrange | positioned in the back side in the radio wave wristwatch 100 rather than the decorative component 25, it can suppress that the coil 23 is exposed to the front side.

[Second Embodiment]
FIG. 11 is an explanatory view showing one step of the antenna manufacturing method according to the second embodiment of the present invention.
In the first embodiment described above, the case where the core 24 of the dial 6 is formed by bending is described as an example. However, in the second embodiment, the case where the core 24 is not bent is illustrated. explain. In addition, the same code | symbol is attached | subjected in the same part as 1st Embodiment, and the description is abbreviate | omitted.

  First, a method for manufacturing the antenna device 18A (see FIG. 14) according to the second embodiment will be described. As shown in FIG. 11, a base member 51a that is a base of the dial 6a is punched out from a plate material 50 made of a magnetic material by a known press machine or the like (molding step). Both ends of the basic member 51 are formed in an arch shape, and these both ends become a pair of decorative parts 25a. Moreover, the part which connects a pair of decoration components 25a becomes the core 24a. Even if the core 24a is not bent, the base member 51a is formed so that the outer periphery of the decorative component 25a is along a perfect circle.

  Then, as shown in FIG. 12, the time letter 54a is formed on the front side of the foundation member 51a. Here, in this embodiment, since the core 24a is formed around 12:00, the gap of the decorative component 25 is formed along the 12: 00-6 o'clock direction. This gap becomes the slit 28a.

When the time character 54a is formed, the coil 23 is uniformly wound around the core 24a as shown in FIG. 13 to create the antenna 30 (see FIG. 14) having the foundation member 51a as the core (winding step). FIG. 13A shows a state at the start of winding, and FIG. 13B shows a state at the completion of winding.
Thereafter, the antenna device 18A is completed by subjecting the base member 51a to spring back processing, burr processing, coloring processing, and the like.

  FIG. 14 is a front view showing a schematic configuration of the radio-controlled wristwatch 200 equipped with the antenna device 18A, and FIG. 15 is a back-side view showing the inside of the back side with the back cover of the radio-controlled wristwatch removed. As shown in FIGS. 14 and 16, since the interval between the slits 28 of the dial 6a is wider than that of the radio wave wristwatch 100 of the first embodiment, it is built in the device case 2 in addition to the antenna 30a. It is possible to realize a unique design in which the mechanism portion 35 is exposed to the outside.

  Further, as shown in FIG. 16, the digital display type display unit 36 and the analog display type small clock unit 37 can be arranged so as to be exposed to the viewer side from the slit 28 of the dial 6a. In this case, as shown in FIG. 17, the display unit 36 and the small clock unit 37 are arranged on the back side of the dial 6 a in the device case 2. In other words, the built-in components including the mechanism portion 35, the display unit 36, the small clock unit 37, and the like are arranged in a state in which at least a part is visible from the outside by the slit 28. This makes it possible to display other measurement values while suppressing the exposure rate of the mechanism portion 35.

[Third Embodiment]
FIG. 18 is a front view showing a schematic configuration of a radio-controlled wristwatch 300 on which an antenna device 18B having a ring member as a core is mounted as a third embodiment of the antenna device according to the present invention. FIG. 19 is an explanatory view showing a schematic configuration of the ring member of FIG. 18, wherein (a) is a front view and (b) is a side view.

  In the first and second embodiments described above, the case where the dials 6 and 6a of the radio-controlled wristwatches 100 and 200 are the cores of the antennas 30 and 30a has been described as an example of the magnetic decoration part. In the embodiment, a case where a ring member surrounding the dial is used as a core will be described as an example. In the following description, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIGS. 18 and 19, the ring member 70 is formed on a substantially C-shape in front view having an opening 71 around 12:00 surrounding the circular dial 6 b. The ring member 70 is molded from a magnetic material and is a magnetic decorative part according to the present invention. Here, the vicinity of 6 o'clock of the ring member 70 is a core 24b around which the coil 23 is wound, and portions extending from both ends of the core 24b are decorative parts 25b. As shown in FIG. 19B, the core 24b is disposed on the back side of the decorative component 25b. In addition, since both end portions 31 of the coil 23 are connected to a coil connecting portion (not shown) on the circuit board 19, the antenna 30 b of the antenna device 18 </ b> B functions by the ring member 70 and the coil 23.

  As described above, if the core of the antenna device 18B is the ring member 70 and the area of the decorative component 25b is increased, the process of laminating the receiving unit and the laminating agent are not required, and the reception sensitivity is efficiently increased. Is possible.

[Fourth Embodiment]
FIG. 20 is a front view showing a schematic configuration of a radio-controlled wristwatch 400 on which an antenna device 18C having a nameplate as a core is mounted as a fourth embodiment of the antenna device according to the present invention. FIG. 21 is an explanatory view showing a schematic configuration of the nameplate of FIG. 20, in which (a) is a front view and (b) is a view as seen from below (a).

  In the first and second embodiments, the case where the dials 6 and 6a of the radio-controlled wristwatches 100 and 200 are the cores of the antennas 30 and 30a as magnetic decoration parts has been described as an example. In the embodiment, a case where the nameplate of the radio-controlled wristwatch is used as a core will be described as an example. In the following description, the same parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 20, the nameplate 80 is embedded in the lower center of the dial 6c. The nameplate 80 is molded from a magnetic material and is a magnetic decorative part according to the present invention. As shown in FIG. 21, the nameplate 80 is shaped so that its center is recessed toward the back side. A concave portion of the nameplate 80 is a core 24c around which the coil 23 is wound, and portions extending from both ends of the core 24c are decorative parts 25c. Various names are formed on the surface of the decorative part 25c (in this embodiment, exemplified as “ABCDE”). Further, since both end portions 31 of the coil 23 are connected to a coil connecting portion (not shown) on the circuit board 19, the nameplate 80 and the coil 23 function the antenna 30c of the antenna device 18C.

  Thus, if the core of the antenna device 18C is used as the nameplate 80 and the area of the decorative part 25c is increased, the process of laminating the receiving unit and the laminating are unnecessary, and the reception sensitivity can be efficiently increased. It becomes possible.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.
For example, in the above-described embodiment, the radio wave wristwatch 100, 200, 300, 400 has been described as an example of the electronic device. However, the present invention can be applied to any electronic device having a communication function. For example, as shown in FIG. 22, the antenna 30 c including the nameplate 80 and the coil 23 may be applied to an antenna device for a radio 91 or an antenna device for a mobile phone 92.
Further, in the present embodiment, the case where punching is performed using a press machine in the molding process has been described as an example, but the molding process is not limited thereto, and other than this, cutting by a milling machine or the like, or by a hammer The forming process may be performed by bending.

  Further, as shown in FIG. 23, a processed part is formed by forming a time character (step S20) or a processing step (step S21) on a single magnetic member in advance, and then forming an outer portion of the processed part. You may make it perform the shaping | molding process (step S22) punched and punched. In this case, the steps S3 to S9 described above are executed after the molding step.

Further, in the present embodiment, the case where the dial 6 is formed from amorphous has been described as an example, but the dial 6 may be formed from another magnetic material. Examples of the magnetic material include ferrite and the like in addition to amorphous.
Further, the time characters 54 and 54a may be formed by various time characters such as engraving and printing.

It is a front view which shows the principal part of the radio-controlled wristwatch to which the antenna device of the first embodiment according to the present invention is applied. FIG. 2 is a back view showing the inside of the back surface side of the radio wristwatch of FIG. 1 with a back cover removed. It is CC sectional view taken on the line in FIG. It is explanatory drawing which shows schematic structure of the antenna which comprises the antenna apparatus of FIG. 1, (a) is a whole perspective view, (b) is an expansion perspective view in the dashed-dotted line S in (a), (c) is It is AA sectional drawing in (b). It is a flowchart which shows the flow of the manufacturing method of the antenna device of 1st Embodiment shown in FIGS. It is explanatory drawing which shows a shaping | molding process among the processes of the antenna manufacturing method of 1st Embodiment. It is explanatory drawing which shows the process of forming a time character on the front side of the base member shape | molded by the formation process of FIG. It is explanatory drawing which shows a winding process among the processes of the antenna manufacturing method of 1st Embodiment. It is explanatory drawing which shows the state which attached the jig | tool to the press used by the antenna manufacturing method of 1st Embodiment, (a) shows the state before a press, (b) shows the state after a press. ing. It is explanatory drawing which shows the state which attached another jig to the press machine of FIG. It is explanatory drawing which shows a formation process among the antenna manufacturing methods of 2nd Embodiment which concerns on this invention. It is explanatory drawing which shows the process of forming a time character on the front side of the base member shape | molded by the formation process of FIG. It is explanatory drawing which shows a winding process among the processes of the antenna manufacturing method of 1st Embodiment. It is a front view which shows the principal part of the radio-controlled wristwatch to which the antenna device of the second embodiment according to the present invention is applied. FIG. 15 is a back view showing the inside of the back surface side of the radio wristwatch of FIG. 14 with the back cover removed. It is a front view which shows the modification of the radio wave wristwatch of FIG. FIG. 17 is a side view showing a schematic configuration inside the radio wave wristwatch of FIG. 16. It is a front view which shows the principal part of the radio-controlled wristwatch to which the antenna device of the third embodiment according to the present invention is applied. It is a top view which shows schematic structure of the ring member with which the radio wave wristwatch of FIG. 18 is equipped. It is a front view which shows the principal part of the radio-controlled wristwatch to which the antenna device according to the fourth embodiment of the present invention is applied. It is a top view which shows schematic structure of the nameplate with which the radio wave wristwatch of FIG. 20 is equipped, (a) is a front view, (b) is the figure seen from the downward direction of (a). It is explanatory drawing which shows the example which installed the nameplate-type antenna with which FIG. 21 was equipped in electronic devices other than a radio wave wristwatch. It is a flowchart which shows the modification of the manufacturing method of the antenna apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Clock timing part 2 Device case 3 Watch band 4 Operation button 5 Watch glass 6 Dial 7 Pointer shaft 8 Pointer 17 Housing fixing member 18 Antenna device 19 Circuit board 20 Space for antenna 21 Opening 22 Opening 23 Coil 24 Core 25 Decoration Component 26 Coil covering portion 27 Connecting portion 28 Slit 30 Antenna 50 Plate material 51 Base member 55 Both ends 60 Pressing machine 61 First holding jig 62 First pressing jig 63 Second pressing jig 64 Second holding jig 100 radio wave watch (electronic equipment)

Claims (7)

In an antenna device mounted on an electronic device,
A core, a coil wound around the core, and a pair of decorative parts connected via the core;
An antenna device, wherein the core and the decorative part are integrally formed of a magnetic material. The antenna device according to claim 1,
The antenna device according to claim 1, wherein the decorative part is any one of a dial, a ring member, and a nameplate. The antenna device according to claim 1 or 2,
An electronic device comprising: a device case on which the antenna device is mounted. The electronic device according to claim 3,
The electronic device further includes a built-in component disposed in a state where at least a part of the device case is visible through a slit formed between the pair of decorative components. A molding step of molding a core around which a coil is wound and a pair of decorative parts connected via the core from a single magnetic member;
A winding step of winding a coil on the core formed by the forming step;
A process for forming the decorative part by processing the pair of decorative parts. A processing step of forming a processing portion into a single magnetic member;
A molding step of molding a core around which a coil is wound and a pair of decorative parts connected via the core, along the outline of the processed portion, of the single magnetic member,
And a winding step of winding a coil on the core formed by the forming step. In the manufacturing method of the antenna device according to claim 5 or 6,
The antenna device manufacturing method further comprising a bending step of bending both ends of the core after the winding step.

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