JP4735536B2 - Electronics - Google Patents

Description

  The present invention relates to an electronic device.

  As a type of electronic device, a radio timepiece that receives a standard radio wave including time information and automatically corrects the current time is known. In such a radio-controlled timepiece, an antenna in which a coil is wound around a core made of an amorphous metal, a ferrite, or the like, which is a magnetic material, is widely used as an antenna that receives a standard radio wave.

  On the other hand, in the case of a timepiece in which the hands are driven by a motor, the hand drive may be affected by external magnetism, and the timepiece accuracy may be reduced. For this reason, it is attempted to maintain the watch accuracy by providing a magnetic-resistant plate for shutting off external magnetism in the watch case. Such anti-magnetic measures are required for maintaining clock accuracy even in a radio-controlled timepiece having a structure similar to that of a general timepiece with respect to driving of the hands.

  By the way, the radio timepiece receives a standard radio wave that includes time information, corrects the internal time based on the time information contained in this radio wave, and displays the correct time, thus blocking external magnetism. Therefore, if the entire movement such as a motor is covered with a magnetic-resistant plate, it is difficult to receive the standard time radio wave, and the reception performance may be lowered.

  Therefore, conventionally, a movement of a motor or the like is covered with a magnetic-resistant plate, while an opening is provided in the magnetic-resistant plate, and the coil winding portion of the magnetic body in the antenna is exposed from the opening so as to prevent a decrease in reception performance. Have been proposed (see, for example, Patent Document 1).

  However, the invention described in Patent Document 1 has a structure in which an opening is formed in the magnetic-resistant plate and the coil winding portion of the antenna is exposed from the opening, so that a wide range of the watch case is covered with the magnetic-resistant plate. Compared to the case where the coil winding part of the antenna is covered with a magnetic resistant plate, the reception sensitivity is somewhat improved, but the presence of the magnetic resistant plate limits the focusing of the magnetic flux to the antenna. I could not expect the improvement of the reception sensitivity.

In order to solve this problem, in recent years, an electronic device has been developed in which a motor body is covered from the surface side of an electronic device by a portion (a motor covering portion) where the coil is not wound of a magnetic body around which the coil is wound. Yes. Providing this motor cover part makes it difficult for unnecessary external magnetism to reach the motor, etc., and the motor cover part is magnetically coupled to the coil winding part, so that the motor body cover part attracts magnetic flux. Thereby, the magnetic flux of a coil winding part increases.
JP 2004-294258 A

However, there is a constant demand for higher reception sensitivity, and there is a demand for further enhancement of the reception sensitivity.
The subject of this invention is improving the receiving sensitivity of an antenna more.

The electronic device according to the invention of claim 1 is:
A plurality of motors (motor 20 in FIG. 3) ;
Among the plurality of motors, a core (core 16 in FIG. 3 ) in which a plurality of magnetic bodies (magnetic body 19 in FIG. 4) are stacked , a coil wound around the core (coil 18 in FIG. 3), and And an extension part (extension part 17 in FIG. 3) having a function as a magnetic-resistant plate, which is disposed so as to cover at least one first motor (first motor 20a in FIG. 3) from the surface side. An antenna (antenna 14 in FIG. 3) ,
At least one end of the both ends of the core and the extension are integrally formed.

The invention according to claim 2 is the electronic device according to claim 1,
In addition to the extending portion , a magnetic-resistant plate disposed so as to cover a second motor other than the first motor of the plurality of motors (second motor 20b in FIG. 3) from the surface side. (Magnetic-resistant plate 22 of FIG. 3) is provided.

An electronic device according to the invention of claim 3 is:
A plurality of motors (motor 20 in FIG. 3) ;
An antenna (antenna 14 in FIG. 3 ) having a core (core 16 in FIG. 3) and a coil wound around the core (coil 18 in FIG. 3) ;
A magnetic-resistant plate (magnetic-resistant plate 22 in FIG. 3) arranged so as to cover at least one second motor from the surface side among the plurality of motors;
An extension part (extension part 17 in FIG. 3) extending from at least one end of both ends of the core covers at least one of the first motors other than the second motor from the surface side. It is characterized by extending like this.

The invention according to claim 4 is the electronic device according to claim 2 or 3,
A gap (gap S in FIG. 3) serving as a sub-magnetic path of the magnetic flux flowing through the core is formed between the magnetic plate (magnetic plate 22 in FIG. 3) and the extension portion (extension portion 17 in FIG. 3). It is formed.

Invention of Claim 5 is an electronic device as described in any one of Claims 2-4 ,
The magnetic-resistant plate and the core are formed of magnetic materials having different magnetic permeability.

The invention according to claim 6 is the electronic device according to claim 3 ,
The extending portion is formed so that the magnetic permeability decreases in accordance with the extending direction extending from the at least one end.

According to the first aspect of the present invention, since the core is formed by laminating a plurality of magnetic bodies, the magnetic flux passing through the core can be captured for each magnetic body, and reception sensitivity is increased. Will be. Further, among the plurality of motors, an extension part having a function of a magnetic-resistant plate, which is arranged so as to cover at least one first motor from the surface side, and at least one end part of both end parts of the core Since it is integrally formed, radio waves entering from the outside are shielded by the extending portion having a function as a magnetic-resistant plate , and the influence of the radio waves on at least one first motor is suppressed, resulting in malfunction of the motor. In addition to preventing the accuracy of the equipment body from being lowered, the magnetic flux from the outside is attracted to increase the magnetic flux of the core. As a result, the receiving sensitivity of the antenna is improved as compared with the conventional technique.

According to the third aspect of the invention, since the magnetically resistant plate covers the first motor and at least one end of the core covers the second motor from the surface side, unnecessary external magnetism is applied to the first and second motors. Is difficult to reach, and it is possible to prevent a decrease in the accuracy of the apparatus main body due to a malfunction of the motor.
On the other hand, since the second motor covers the extension portion extending from at least one end of the core, the extension portion extending from the one end attracts the magnetic flux, thereby increasing the magnetic flux of the coil. To do. Therefore, the receiving sensitivity of the antenna is improved.

FIG. 1 is a front view illustrating a schematic configuration of a radio-controlled wristwatch that is an example of an electronic apparatus including an antenna according to the present invention. FIG. 2 is an exploded perspective view of the radio-controlled wristwatch.
As shown in FIGS. 1 and 2, the radio-controlled wristwatch 100 is provided with a device body 2 made of metal such as stainless steel or titanium. Band attachment portions 3 to which a watch band (not shown) is attached are formed at both upper and lower end portions of the device body 2, that is, at the 12 o'clock side end portion and the 6 o'clock direction end portion. In addition, a plurality of operation buttons 4 for inputting various operation instructions such as a time adjustment instruction are provided on the outer peripheral portion of the device main body 2. The inside of the device main body 2 is hollow, and this hollow portion serves as a storage portion 21 containing various components.

  A watch glass 5 is attached to the viewing side (front side) of the device body 2 so as to close the viewing side. A dial 6 is arranged on the opposite side (back side) of the watch glass 5 from the viewing side.

Further, as shown in FIG. 2, a back cover 23 that closes the back surface of the device main body 2 is attached to the back side of the device main body 2.
Between the watch glass 5 and the dial 6 in the device main body 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 on the back side of the dial 6. The hands are moved by the provided moving part 9.

  The moving part 9 has a driving electronic component 10, a mechanical component 11 such as a gear for transmitting power from the electronic component 10 to each pointer 8, and the electronic component 10 and the mechanical component 11. The device module 12 disposed in the storage unit 21 and a frame member 13 that covers the back side and the side of the device module 12 are provided.

  Hereinafter, the device module 12 will be described in detail. 3A and 3B are diagrams showing a schematic configuration of the equipment module 12, wherein FIG. 3A is a plan view, FIG. 3B is a cross-sectional view taken along the line A-A in FIG. 3A, and FIG. It is.

As shown in FIG. 3, an antenna 14 that receives radio waves and a magnetic-resistant plate 22 are provided on the surface side of the device module 12. The device module 12 includes a plurality of motors 20 as the electronic components 10.

  The antenna 14 includes a core 16, an extending portion 17 that integrally extends from both ends of the core 16, and a coil 18 that is wound around the core 16. The core 16 and the extension portion 17 are formed by laminating a plurality of inverted U-shaped magnetic bodies 19. The plurality of magnetic bodies 19 are formed so that both end portions thereof are gradually shortened toward the inside of the device module 12. Thereby, the thickness of the extension part 17 after lamination | stacking becomes thin gradually as it goes ahead. Since the permeability of the thick part of the magnetic body 19 is higher than that of the thin part, the plurality of magnetic bodies 19 are stacked as described above, so that the permeability extends from both ends of the core 16. Lower towards

  As shown in FIG. 3, the extending portion 17 of the antenna 14 is arranged in the device module 12 so as to cover at least one first motor 20 a among the plurality of motors 20 from the surface side. Here, although the case where three motors 20 are mounted is illustrated in the present embodiment, one of the three motors 20 close to the antenna 14 is defined as a first motor 20a, and these first motors. The motor 20 that is further away from the antenna 14 than 20a is defined as a second motor 20b. And the extension part 17 which covers the 1st motor 20a from the surface side functions as a magnetic-resistant board with respect to the 1st motor 20a.

  In the device module 12, a magnetic-resistant plate 22 that covers the second motor 20 b from the surface side is disposed between the extending portions 17 of the antenna 14. The antimagnetic plate 22 is provided separately from the extending portion 17 of the antenna 14, and a gap S serving as a sub magnetic path for the magnetic flux flowing through the core 16 is formed between them.

  And the core 16, the extension part 17, and the magnetic-resistant board 22 are formed from magnetic materials, such as a ferrite, an amorphous, and a permalloy so that the magnetic permeability may mutually differ. Or it forms by apply | coating what made these powders to a metal. For the magnetic permeability of each part, an optimum magnetic material is used by experiments and simulations according to the required performance. In this case, if the core 16 has the highest magnetic permeability, the captured radio wave can easily flow through the core 16 and the sensitivity can be increased.

Next, the operation of this embodiment will be described.
When the time is corrected, the magnetic flux passes through the core 16 by the radio wave captured by the extending portion 17 in the antenna 14. A current is generated in the coil 18 by the passage of the magnetic flux. At this time, since the magnetic-resistant plate 22 covers the second motor 20b from the surface side, the electromagnetic wave is shielded by the magnetic-resistant plate 22, and the influence of the electric wave on the second motor 20b is suppressed. Moreover, since the extension part 17 has covered the 1st motor 20a from the surface side, an electromagnetic wave is shielded by the extension part 17, and the influence of the electromagnetic wave with respect to the 1st motor 20a is suppressed.

  As described above, according to this embodiment, since the core is formed by laminating the plurality of magnetic bodies 19, the magnetic flux passing through the core can be captured for each magnetic body, and the reception sensitivity Will be enhanced. Moreover, since the extension part 17 as a magnetic-resistant board which covers a 1st motor from the surface side and at least one edge part of the both ends of a core are integrally formed, the extension part 17 attracts magnetic flux. Thus, the magnetic flux of the core 16 also increases. As a result, the receiving sensitivity of the antenna is improved as compared with the conventional technique.

  In the present embodiment, in addition to the extending portion 17 that functions as a magnetic-resistant plate, another magnetic-resistant plate 22 is disposed so as to cover the second motor 20b from the front surface side. The influence of radio waves on the second motor 20b that is not present can be suppressed.

  Further, in the present embodiment, a gap S serving as a secondary magnetic path for the magnetic flux flowing through the core 16 is formed between the magnetic-resistant plate 22 and the extending portion 17, and an overcurrent is generated by this secondary magnetic path. This can be prevented.

  And since the magnetic-resistant plate 22, the extension part 17, and the core 16 are formed of magnetic materials having different magnetic permeability, the magnetic permeability of each member is set so that the magnetic flux easily flows toward the core 16. In this case, higher sensitivity can be obtained and the magnetic resistance can be improved.

  And since the extending part 17 is formed so that the magnetic permeability decreases in the extending direction, the magnetic flux easily flows from the distal end part of the extending part 17 toward the base end part, that is, the core 16. Therefore, the reception sensitivity can be further increased.

Note that the present invention is not limited to the above embodiment, and can be modified as appropriate.
FIG. 4 is a diagram showing a first modification of the antenna, and shows a case where the core 16 and the extension portion 17 are formed of a plurality of magnetic bodies having a U-shape, and (a) is a plurality of magnetic bodies. (B) is a perspective view showing the state where the coil 18 was wound.
As shown in FIG. 4, the core 16 and the extending portion 17 are formed by laminating a plurality of magnetic bodies 19 whose plane is substantially U-shaped. The plurality of magnetic bodies 19 are formed such that both ends are gradually shortened as going downward in FIG. 4, that is, inside the equipment module 12. Thereby, the thickness of the extension part 17 after lamination | stacking becomes thin gradually as it goes ahead. Since the permeability of the thick portion of the magnetic body 19 is higher than that of the narrow portion, the magnetic permeability extends from both ends of the core 16 by laminating the plurality of magnetic bodies 19 as described above. Lower towards
Moreover, in this embodiment, although the case where the core 16 and the extension part 17 were formed by laminating | stacking the some magnetic body 19 was demonstrated and demonstrated, the core and the extension part are integrally molded. Also good. 5A and 5B are diagrams showing an outline of an antenna 14A in which a core 16A and an extending portion 17A are integrally formed. FIG. 5A is a side view and FIG. 5B is a perspective view. As shown in FIG. 5, even when the core 16A and the extension portion 17A are integrally formed, if the thickness of the extension portion 17A is formed so as to gradually become thinner, The magnetic permeability of the projecting portion 17A decreases in the extending direction, and the magnetic flux easily flows toward the core 16A.

  Further, in the present embodiment, the case where all of the plurality of motors 20 are covered from the surface side by the magnetic-resistant plate 22 and the extension part 17 has been described as an example, but even if all the motors are covered only by the extension part, Good. Specifically, as shown in FIG. 6, at least one of the extending portions 17 </ b> B is formed to extend from one end portion of the core 16 </ b> B so as to cover all the motors 20.

  In the above-described embodiment, the radio wave wristwatch 100 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, examples of the electronic device include a mobile phone, a radio, a portable game machine, and a digital audio player.

1 is a front view illustrating a schematic configuration of a radio-controlled wristwatch that is an example of an electronic apparatus including an antenna according to the present invention. It is a disassembled perspective view of the radio-controlled wristwatch of FIG. It is a figure which shows the apparatus module of this embodiment, (a) is a top view, (b) is AA sectional drawing of (a), (c) is BB sectional drawing of (a). It is a figure which shows the 1st modification of the antenna of this embodiment, (a) is a disassembled perspective view, (b) is a perspective view which shows assembly completion. It is a figure which shows the 2nd modification of the antenna which concerns on this invention, (a) is a side view, (b) is a perspective view. It is a top view which shows the modification of the equipment module which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Apparatus main body 10 Electronic component 11 Mechanical component 12 Equipment module 14 Antenna 15 Magnetic-resistant board 16 Core 17 Extension part 18 Coil 19 Magnetic body 20a 1st motor 20b 2nd motor 21 Storage part 22 Magnetic-resistant board 100 Radio wave watch (electronic equipment) )

Claims (6)

Multiple motors,
As a magnetic- resistant plate disposed so as to cover at least one first motor from the surface side among the plurality of motors , a core in which a plurality of magnetic bodies are laminated , a coil wound around the core, and the plurality of motors An antenna having an extension part having a function ,
At least one end portion of the both end portions of the core and the extending portion are integrally formed. The electronic device according to claim 1,
In addition to the extending portion , an electronic device comprising a magnetically resistant plate disposed so as to cover a second motor other than the first motor of at least one of the plurality of motors from the surface side. machine. Multiple motors,
An antenna having a core and a coil coil wound around the core;
A magnetic resistant plate arranged to cover at least one second motor from the surface side among the plurality of motors;
Of the both ends of the core, at least one extending portion extends from one end so as to cover at least one of the first motors other than the second motor from the surface side. And electronic equipment. The electronic device according to claim 2 or 3,
An electronic device, wherein a gap serving as a sub-magnetic path of a magnetic flux flowing through the core is formed between the magnetic-resistant plate and the extending portion . In the electronic device as described in any one of Claims 2-4 ,
2. The electronic apparatus according to claim 1, wherein the magnetic plate and the core are made of magnetic materials having different magnetic permeability. The electronic device according to claim 3 ,
The extending portion is an electronic device, characterized in that the magnetic permeability is formed to be lower in accordance with the extension direction extending from the at least one end.

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