JP2005164354A - Electronic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To actualize an electronic apparatus with exterior components, such as a case and a rear cover, formed partly or wholly out of metal without deteriorating (lowering) the reception sensitivity of an antenna for receiving a prescribed radio wave. <P>SOLUTION: A wrist watch 1, a kind of electronic apparatus, is a radio wave timepiece equipped with the antenna 32 for receiving a standard frequency broadcast and a timepiece module 21. The timepiece module 21, the antenna 32, etc. are disposed within an enclosure having a timepiece case 11, the rear cover 23, etc. formed out of metal such as stainless steel or titanium. Magnetic sheets 40a and 40b, being magnetic members formed out of magnetic material such as amorphous material, are bonded to an inner circumferential surface of the timepiece case 11 and to an inner surface of the rear cover 23 (an internal side surface of the timepiece case 11), respectively. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic device including an antenna that receives a predetermined radio wave.

  2. Description of the Related Art Conventionally, a radio clock that has a bar antenna that receives a standard radio wave including time data (that is, a time code) and corrects the time based on the standard radio wave received by the antenna is known as a clock that is a type of electronic device. It has been.

  When there is a metal member in the vicinity of the bar antenna, there is a problem that eddy current loss occurs due to the magnetic flux generated in the antenna coil passing through the nearby metal, and the reception sensitivity of the antenna deteriorates.

Therefore, as in Patent Document 1, the wristwatch case is formed of a synthetic resin, and at the 12 o'clock side band attaching portion, a concave portion opened upward is formed, and the antenna is accommodated in the concave portion. It is separated from the metal back cover.
JP 2001-305244 A

  The resin watch case has no texture or weight compared to the metal watch case, and has no luxury.

  In view of the above circumstances, an object of the present invention is to realize an electronic device in which a part or all of exterior parts such as a case and a back cover can be formed of metal without deteriorating (decreasing) the reception sensitivity of the antenna. .

  In order to solve the above-mentioned problem, the invention described in claim 1 is a metal case (for example, the watch case 11 of FIG. 1) and an antenna (for example, the antenna 32 of FIG. 1) disposed in the case. And a magnetic member (for example, the magnetic sheets 40a and 40b in FIG. 1) disposed between the inner surface of the case and the antenna and having a higher magnetic permeability and lower electrical conductivity than the case. It is said.

  According to the first aspect of the present invention, it is possible to realize an electronic apparatus in which a magnetic member for passing a demagnetizing field generated in the antenna is disposed between the antenna and the metal case. In the antenna, a demagnetizing field (magnetic flux) is generated that prevents the time variation of the signal magnetic flux (magnetic flux due to the magnetic field component of the received radio wave) that passes (links) through the coil (winding). The magnetic field is distributed to take a path with a smaller magnetoresistance. That is, the demagnetizing field generated in the antenna passes through the magnetic member arranged between the case and hardly passes through the case. For this reason, eddy current loss due to the demagnetizing field passing through the case hardly occurs. Therefore, the deterioration (decrease) in the receiving sensitivity of the antenna due to the case made of metal is suppressed.

According to a second aspect of the present invention, in the electronic device according to the first aspect, the magnetic member is provided on the inner surface of the case.

  Further, the invention described in claim 3 includes a case (for example, the watch case 11 of FIG. 1), a metal back cover (for example, the back cover 23 of FIG. 1) attached to the lower surface of the case, and the case. An antenna housed therein (for example, the antenna 32 of FIG. 1), a magnetic member disposed between the inner surface of the back cover and the antenna, having a higher magnetic permeability and lower conductivity than the back cover; (For example, magnetic sheets 40a and 40b in FIG. 1).

  According to the third aspect of the present invention, it is possible to realize an electronic apparatus in which a magnetic member for allowing a demagnetizing field generated in the antenna to pass therethrough is disposed between the antenna and the metal back cover. In the antenna, a demagnetizing field (magnetic flux) is generated that prevents the signal flux passing through the coil (winding) (linkage) (magnetic flux due to the magnetic field component of the received radio wave) from changing over time. The magnetic field is distributed to take a path with a smaller magnetoresistance. That is, the demagnetizing field generated in the antenna passes through the magnetic member arranged between the case and hardly passes through the back cover. For this reason, there is almost no eddy current loss caused by the demagnetizing field passing through the back cover. Therefore, the deterioration (decrease) in the receiving sensitivity of the antenna due to the back cover made of metal is suppressed.

According to a fourth aspect of the present invention, in the electronic device according to the third aspect, the magnetic member is provided on the inner surface of the back cover.

According to a fifth aspect of the present invention, in the electronic device according to the first or third aspect, an electronic module is accommodated in the case, the antenna and other electronic components are accommodated in the module, and the magnetic The member is provided on the outer surface of the module.

  The invention according to claim 6 is a case (for example, watch case 12 in FIG. 2) in which an antenna housing recess is formed, and an antenna (for example, antenna 32 in FIG. 2) housed in the antenna housing recess of this case. ), A metal cover member (for example, the cover member 14a in FIG. 2) that covers the opening of the antenna housing recess of the case, and a magnetic permeability higher than that of the cover member. And a magnetic member having a low electrical conductivity (for example, the magnetic sheet 40d in FIG. 2).

  According to the sixth aspect of the invention, it is possible to realize an electronic apparatus in which a cover member that covers the antenna housing recess formed in the case is formed of metal. The demagnetizing field generated in the antenna passes through the magnetic member arranged between the metal cover member and hardly passes through the cover member. For this reason, the eddy current loss by a magnetic flux passing through a cover member hardly arises. Therefore, even if the cover member is made of metal, the reception sensitivity of the antenna is hardly deteriorated.

  The invention described in claim 7 includes a case made of a synthetic resin (for example, the watch case 15 of FIG. 3), an antenna housed in the case (for example, the antenna 32 of FIG. 3), and the synthetic resin. A metal decorative member (for example, bezel 27 in FIG. 3) attached to the outside of the case made of metal, disposed between the outer surface of the case and the decorative member, and has a higher magnetic permeability than the decorative member; The magnetic member (for example, the magnetic sheet 40e of FIG. 3) with low electrical conductivity is provided.

  According to the seventh aspect of the present invention, an electronic apparatus in which a metallic decorative member is attached to the outside of a synthetic resin case can be realized. That is, the demagnetizing field generated in the antenna passes through the magnetic member disposed between the decorative member and hardly passes through the decorative member. For this reason, deterioration (decrease) in reception sensitivity due to the antenna being placed in a case to which a metallic decorative member is attached is suppressed.

According to an eighth aspect of the present invention, in the electronic device according to any one of the first to seventh aspects, a module for displaying time is accommodated in the case, and the device is held in the case. A band for attaching to the head is attached.

  According to the eighth aspect of the present invention, it is possible to realize a wristwatch in which the reception sensitivity of the antenna does not deteriorate (decrease) even if the exterior part is made of metal.

  ADVANTAGE OF THE INVENTION According to this invention, even if some or all exterior parts, such as a case and a back cover, are formed with a metal, the electronic device which does not degrade (decrease) the receiving sensitivity of an antenna is realizable.

The best mode for carrying out the present invention will be described below with reference to the drawings.
In the following, the case where the present invention is applied to a wristwatch-type radio timepiece (hereinafter simply referred to as “wristwatch”) which is a kind of electronic equipment will be described, but the application of the present invention is limited to this. It is not a thing.

[First Embodiment]
First, the first embodiment will be described.

  FIG. 1 is a schematic longitudinal sectional view of a wristwatch 1 according to the first embodiment. According to FIG. 1, the wristwatch 1 includes a watch case 11 that is an exterior part and a back cover 23 that is an exterior part. The watch case 11 and the back cover 23 constitute a housing of an electronic device. A watch module 31 is housed in the watch case 11 of the wristwatch 1, and an antenna 32 for receiving a standard radio wave is housed in the watch module 31. Bands 10 and 10 are attached to the wristwatch case 11 at 12 o'clock and 6 o'clock for mounting the electronic device on the wrist.

  The antenna 32 is a bar antenna, a rod-shaped core made of a magnetic material having a high relative permeability such as amorphous or ferrite and a low conductivity, and a coil in which a conductive wire such as copper is wound around the core And is configured. When the antenna 32 is placed in a magnetic field generated by a standard radio wave (hereinafter referred to as “signal magnetic field”), a magnetic flux generated by the signal magnetic field (hereinafter referred to as “signal magnetic flux”) is higher than that in the surrounding space. An induced electromotive force is generated so as to generate a demagnetizing field (magnetic flux) in a direction in which a change in signal magnetic flux inside the coil is prevented from occurring in the coil, concentrating on the core having high magnetic permeability. Since the standard radio wave is an AC signal, the induced electromotive force generated is AC.

  The timepiece module 31 further includes an IC chip having various circuits and an analog pointer mechanism for moving the hands 34 such as the hour hand and the second hand on the dial 33. The circuit elements included in the IC chip include a control IC such as a CPU that controls each part of the timepiece module 31 and an induction generated in the coil of the antenna 32 by being electrically connected to the coil of the antenna 32 and a lead wire such as copper. There are a receiving circuit that detects electric power, amplifies and demodulates the detected electric signal to extract time data (that is, a time code) included in a standard radio wave, and a timing circuit that has an oscillator and measures the current time. The control IC performs processing such as correcting the time measured by the time measuring circuit based on the time data taken out by the receiving circuit, and controlling the analog pointer mechanism to move the pointer 34 so as to indicate the corrected current time. .

  The watch case 11 is made of a metal such as stainless steel or titanium and has an annular shape. A watch glass 21 is fitted in the center of the upper surface of the watch case 11 via a packing 22 so that the dial 33 inside the watch case 11 can be seen, and the lower surface is similar to the watch case 11. A back cover 23 made of a metal is attached via a waterproof ring 24 and is configured as a housing.

  In the watch case 11, the watch module 31 is arranged above the back cover 23, and the dial 33 is arranged further above. The antenna 32 is housed on the 12 o'clock side of the timepiece module 31.

  Further, magnetic sheets 40a and 40b are bonded to the inner peripheral surface of the watch case 11 and the inner surface of the back cover 23 (the surface on the inner side of the watch case 11; the upper surface in the figure) by sticking or the like. The magnetic sheets 40a and 40b are obtained by blending a resin sheet with a magnetic material such as amorphous or ferrite. The magnetic sheets 40a and 40b have a higher relative permeability and lower electrical conductivity than the metal forming the watch case 11 and the back cover 23. It is a member. That is, the wristwatch 1 has a structure in which the magnetic sheets 40a and 40b, which are magnetic members, are disposed between the antenna 32 and the watch case 11 and the back cover 23 formed of metal.

  The demagnetizing field (magnetic flux) generated in the antenna 32 with respect to the signal magnetic field is distributed so as to take a path with a smaller magnetic resistance. Specifically, the relative magnetic permeability of the magnetic sheet 40a is larger than that of the watch case 11 formed with metal. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion facing the inner peripheral surface of the watch case 11 passes through the magnetic sheet 40a having a smaller magnetic resistance, and the magnetic flux passing through the watch case 11 is extremely small. . Moreover, the relative magnetic permeability of the magnetic sheet 40b is larger than that of the back cover 23 formed with metal. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion facing the inner surface of the back cover 23 passes through the magnetic sheet 40 b having a smaller magnetic resistance, and the magnetic flux passing through the back cover 23 is very small.

  That is, since the magnetic flux passing through the watch case 11 and the back cover 23 is extremely small, almost no eddy current is generated. Moreover, since the magnetic sheets 40a and 40b have low electrical conductivity, eddy currents hardly occur even when magnetic flux passes. Accordingly, since eddy current loss due to the demagnetizing field generated in the antenna 32 hardly occurs, deterioration (decrease) in reception sensitivity of the antenna 32 due to housing (arrangement) inside the metal watch case 11 is suppressed. .

<Action and effect>
As described above, according to the wristwatch 1 according to the first embodiment, the magnetic sheet 40a, 40b, which is a magnetic member, is disposed between the metal watch case 11 and the back cover 23 and the antenna 32, so that the magnetic flux passes through the metal. As a result, almost no eddy current loss is generated, so that deterioration (decrease) in the reception sensitivity of the antenna 32 is suppressed.

  In FIG. 1, the watch case 11 may be formed of a synthetic resin such as an ABS resin instead of a metal. In this case, the magnetic sheet 40b bonded to the inner peripheral surface of the watch case 11 is not necessary, and only the magnetic sheet 40a bonded to the inner surface of the back cover 23 may be provided. This is because the synthetic resin forming the watch case 11 does not generate eddy current even when magnetic flux passes, that is, no eddy current is generated, and the reception sensitivity of the antenna 32 does not deteriorate.

[Second Embodiment]
Next, a second embodiment will be described.
In the second embodiment, the same elements as those in the first embodiment described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 2 is a schematic longitudinal sectional view of the wristwatch 2 in the second embodiment. In the figure, the right side is the 12 o'clock direction of the dial 33 and the left side is the 6 o'clock direction. According to the figure, the wristwatch 2 includes a watch case 12 and a back cover 23 that constitute a housing. The wristwatch 2 is a radio-controlled timepiece that includes an antenna 32 and a timepiece module 31.

  The watch case 12 is made of synthetic resin such as ABS resin, has an annular shape, a watch glass 21 is fitted through a packing 22, and a metal bezel 26 is attached to the outer periphery of the upper surface. It has been. Further, the watch case 12 is provided with extending portions 13a and 13b extending outward from two side portions corresponding to the 12:00 and 6 o'clock positions of the dial 33. The extension parts 13a and 13b are made of the same material as the watch case 12, and are integrally formed with the extension parts 12a and 12b, and a cover member 14a which is an exterior part attached to the upper surface of the extension parts 12a and 12b. , 14b. The cover members 14a and 14b are made of metal.

  In particular, the extended portion 12a formed at the 12 o'clock position is formed with a recess opening upward, and the antenna 32 is accommodated in the recess. A recess opening downward is formed on the back surface of the cover member 14a attached to the upper surface of the extended portion 12a (the surface facing the extended portion 12a; the lower surface in the figure). Covering. In addition, the extension portion 12 a of the watch case 12 is provided with a communication path (not shown) for passing a lead wire that electrically connects the coil of the antenna 32 and the watch module 31.

  Also, magnetic sheets 40c and 40d are attached to the surface portion facing the antenna 32, that is, the inner surface of the recess formed in the extended portion 12a and the inner surface of the recess formed in the cover member 14a, respectively. It is glued. That is, the wristwatch 2 has a structure in which the magnetic sheets 40c and 40d, which are magnetic members, are disposed between the antenna 32 and the back cover 23 and the cover member 14a formed with metal.

  The demagnetizing field (magnetic flux) generated in the antenna 32 is distributed so as to take a path with a smaller magnetic resistance. Specifically, the relative magnetic permeability of the magnetic sheet 40c is larger than that of the metal back cover 23. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion close to the inner surface of the back cover 23 passes through the magnetic sheet 40 c having a smaller magnetic resistance, and the magnetic flux passing through the back cover 23 is very small. Moreover, the relative magnetic permeability of the magnetic sheet 40d is larger than that of the cover member 14a formed with metal. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion facing the inner surface of the concave portion of the cover member 14a passes through the magnetic sheet 40d having a smaller magnetic resistance, and the magnetic flux passing through the cover member 14a is very small.

  That is, since the magnetic flux passing through the back cover 23 and the cover member 14a is extremely small, almost no eddy current is generated. Further, since the magnetic sheets 40c and 40d have low electrical conductivity, eddy current hardly occurs even when magnetic flux passes. Therefore, since eddy current loss due to the demagnetizing field generated in the antenna 32 hardly occurs, deterioration (decrease) in the reception sensitivity of the antenna 32 due to the metal formation of the cover member 14a is suppressed.

<Action and effect>
As described above, according to the wristwatch 2 according to the second embodiment, the magnetic sheet 40c and 40d, which are magnetic members, are disposed between the metal-covered back cover 23 and the cover member 14a and the antenna 32, so that the magnetic flux passes through the metal. As a result, almost no eddy current loss is generated, so that deterioration (decrease) in the reception sensitivity of the antenna 32 is suppressed.

[Third Embodiment]
Next, a third embodiment will be described.
Note that in the third embodiment, the same elements as those in the first and second embodiments described above are denoted by the same reference numerals, and detailed description thereof is omitted.

  FIG. 3 is a schematic longitudinal sectional view of the wristwatch 3 in the third embodiment. According to the figure, the wristwatch 3 includes exterior parts of the watch case 15, the back cover 23 and the bezel 27, and the watch case 15, the back cover 23 and the bezel 27 constitute a casing. The wristwatch 3 is a radio-controlled timepiece that includes a timepiece module 31 having an antenna 32.

  The watch case 15 is made of synthetic resin, and a bezel 27 made of metal is attached to the outer periphery of the upper surface of the watch case 15 in order to decorate the outer surface of the watch case 15. In the watch case 15, an antenna 32 is disposed above the back cover 23, and a dial 33 is disposed further above.

  Further, on the inner surface of the back cover 23 (the surface on the inner side of the watch case 15; the upper surface in the drawing) and the back surface of the bezel 27 (the surface facing the watch case 15; the lower surface in the drawing), a magnetic sheet is provided. 40b and 40e are adhered by pasting or the like. That is, the wristwatch 3 has a structure in which the magnetic sheets 40b and 40e, which are magnetic members, are disposed between the antenna 32 and the back cover 23 and the bezel 27 formed with metal.

  The demagnetizing field (magnetic flux) generated in the antenna 32 is distributed so as to take a path with a smaller magnetic resistance. Specifically, the relative magnetic permeability of the magnetic sheet 40b is larger than that of the back cover 23 formed with metal. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion facing the inner surface of the back cover 23 passes through the magnetic sheet 40 b having a smaller magnetic resistance, and the magnetic flux passing through the back cover 23 is very small. The relative magnetic permeability of the magnetic sheet 40e is larger than that of the bezel 27 formed with metal. For this reason, of the magnetic flux generated in the antenna 32, the magnetic flux in the portion close to the back surface of the bezel 27 passes through the magnetic sheet 40e having a smaller magnetic resistance, and the magnetic flux passing through the bezel 27 is very small.

  That is, since the magnetic flux passing through the back cover 23 and the bezel 27 is extremely small, almost no eddy current is generated. In addition, since the magnetic sheets 40b and 40e have low electrical conductivity, almost no eddy current is generated even when magnetic flux is generated. Therefore, since eddy current loss due to the demagnetizing field generated in the antenna 32 hardly occurs, deterioration (decrease) in the reception sensitivity of the antenna 32 is suppressed.

<Action and effect>
As described above, according to the wristwatch 3 according to the third embodiment, the magnetic sheets 40b and 40e, which are magnetic members, are disposed between the antenna 32 and the back cover 23 and the bezel 27 formed with metal, so that the magnetic flux passes through the metal. As a result, eddy current loss due to the generation of the antenna 32 hardly occurs, so that deterioration (decrease) in the reception sensitivity of the antenna 32 is suppressed.

[Modification]
The application of the present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

(1) Arrangement position and size of magnetic sheet For example, in the first embodiment described above, the magnetic sheets 40a and 40b are bonded to the entire inner peripheral surface of the watch case 11 and the entire inner surface of the back cover 23, respectively. Although it was decided (refer FIG. 1), it is good also as bonding partially. Specifically, for example, as shown in FIG.

  FIG. 4 is a view for explaining the arrangement position and size of the magnetic sheet partially arranged in the wristwatch 4. FIG. 4A is a schematic longitudinal sectional view of the wristwatch 4, and FIG. 4B is a schematic transverse sectional view of the wristwatch 4. In the figure, for simplicity of explanation, the timepiece module 31 and the dial 33 in the timepiece case 11 are omitted. According to the figure, the magnetic sheets 40f and 40g are bonded to the inner peripheral surface of the watch case 11 and the inner surface of the back cover 23, respectively, in a part close to the antenna 32 (the right half in the figure). As described above, the arrangement position and size of the magnetic sheet may be appropriately changed according to the distribution of the demagnetizing field (magnetic flux) generated in the antenna 32.

(2) Magnetic Sheet Affixing Position In the first embodiment described above, the magnetic sheets 40a and 40b are adhered to the entire inner peripheral surface of the watch case 11 and the inner surface of the back cover 23. It may be pasted on.

  FIG. 5 is a view showing the wristwatch 1 in which magnetic sheets 41a and 41b are attached to the outer surface of the timepiece module 31, and this wristwatch includes a timepiece module 31 that digitally displays the time. The timepiece module 31 includes an upper housing 42 made of synthetic resin and a lower housing 43 made of synthetic resin. A liquid crystal display device 44 is accommodated in the upper housing 42, and a liquid crystal display device is disposed above the upper housing 42. A parting plate 45 is provided for overseeing the exposed area 44. Further, a circuit board 47 on which an IC chip 46 is mounted is disposed between the upper housing 42 and the lower housing 43. The upper surface of the circuit board 47 is electrically connected to the liquid crystal display device 44 via the interconnector 48, and the antenna 32 is attached to the lower surface of the circuit board 47. The lower housing 43 is formed with an antenna housing recess 43 a for housing the antenna 32 and a battery housing hole 43 b for housing the battery 49. Magnetic sheets 41 a and 41 b are attached to the peripheral side surface and the lower surface of the timepiece module 31, that is, the upper surface, the peripheral side surfaces of the lower housings 42 and 43, and the lower surface of the lower housing 43. An opening for replacing the battery 49 is formed in the magnetic sheet 41b on the lower surface 43 of the lower housing.

(3) Modification of Magnetic Member Moreover, in each of the embodiments described above, a magnetic sheet is used as the magnetic member. For example, a synthetic resin mixed with a magnetic material and molded into a predetermined shape may be used. It can also be formed into a frame shape and put on the module.

(4) Electronic device to which the present invention is applied In each of the above-described embodiments, the case where the present invention is applied to a wristwatch type radio-controlled timepiece has been described. However, the present invention is not limited to this. In addition, any electronic device including an antenna that receives radio waves, such as a small radio, can be applied.

1 is a schematic sectional view of a wrist watch according to a first embodiment. The schematic sectional drawing of the wristwatch in 2nd Embodiment. The schematic sectional drawing of the wristwatch in 3rd Embodiment. The (a) schematic longitudinal cross-sectional view of the wristwatch which adhered the magnetic sheet partially, (b) The schematic cross-sectional view. 1 is a schematic cross-sectional view of a wristwatch in which a magnetic sheet is attached to a watch module.

Explanation of symbols

1, 2, 3, 4 Wristwatch 11, 12, 15 Watch case 13a, 13b Extension part 12a, 12b Extension part 14a, 14b Cover member 21 Watch glass 23 Back cover 26, 27 Bezel 31 Watch module 32 Antenna 33 Dial 40a-40g, 41a, 41b Magnetic sheet

Claims (9)

A metal case,
An antenna placed in this case,
A magnetic member disposed between the inner surface of the case and the antenna, having a higher magnetic permeability than the case and having a low electrical conductivity;
An electronic device characterized by comprising:   The electronic device according to claim 1, wherein the magnetic member is provided on an inner surface of the case. Case and
A metal back cover attached to the bottom of the case,
An antenna housed in the case;
A magnetic member disposed between the back cover inner surface and the antenna, having a higher magnetic permeability than the back cover and having a low electrical conductivity;
An electronic device characterized by comprising:   The electronic apparatus according to claim 3, wherein the magnetic member is provided on an inner surface of the back cover. An electronic module is accommodated in the case, and the antenna and other electronic components are accommodated in the module.
The electronic device according to claim 1, wherein the magnetic member is provided on an outer surface of the module. A case in which an antenna housing recess is formed;
An antenna housed in the antenna housing recess of this case;
A metal cover member covering the opening of the antenna housing recess of the case;
A magnetic member disposed between the cover member and the antenna, having a higher magnetic permeability than the cover member and having a low electrical conductivity;
An electronic device characterized by comprising: A synthetic resin case,
An antenna housed in this case;
A metal decorative member attached to the outside of the synthetic resin case;
A magnetic member disposed between the outer surface of the case and the decorative member, having a higher magnetic permeability than the decorative member and having a low electrical conductivity;
An electronic device characterized by comprising:   The electronic device according to claim 1, wherein the magnetic member is a magnetic sheet in which a magnetic material is dispersed in a resin sheet. A module for displaying time in the case is housed,
The electronic device according to any one of claims 1 to 7, wherein a band for attaching the device to an arm is attached to the case.

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