JP2005260765A - Electronics - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent loss of magnetic flux due to eddy current generated in a conductive part such as an electronic part and to improve reception sensitivity.
A soft magnetic material 23 is provided between an antenna coil 21 of a wireless module 4 disposed in a peripheral portion on a lower surface side of a watch glass 2 and a liquid crystal display panel 9 disposed on the lower side of the antenna coil 21. Was provided. Therefore, when magnetic flux is generated in the antenna coil 21 during communication by the wireless module 4, it is soft magnetic that eddy currents are generated in conductive parts such as electronic parts incorporated in the watch case 1 and the magnetic flux is lost. This can be prevented by the material 23, and thereby the receiving sensitivity can be increased. Further, since the antenna coil 21 is arranged in the peripheral portion on the lower surface of the watch glass 2, the antenna coil 21 can be brought close to the outer surface of the watch case 1, thereby shortening the communication distance. Reception sensitivity can be increased.
[Selection] Figure 1

Description

  The present invention relates to an electronic device such as a wristwatch or a mobile phone, and more particularly to an electronic device including a wireless ID (RFID), an electronic tag, and a transponder, and a device that wirelessly transmits and receives data by electromagnetic induction.

Conventionally, there is a wristwatch in which an RFID module having an antenna coil and an IC chip mounted on a substrate is incorporated in a wristwatch case, and data is transmitted and received wirelessly by electromagnetic induction.
JP 2000-509813 A

  However, in the conventional wristwatch, various electronic components necessary for the watch function are incorporated in the watch case, and therefore, various electronic components, that is, conductive components are swirled by the magnetic flux generated in the antenna coil of the RFID module. There is a problem in that current is generated, thereby causing loss of magnetic flux and lowering reception sensitivity.

  The problem to be solved by the present invention is to provide an electronic device capable of preventing loss of magnetic flux due to eddy current generated in a conductive component such as an electronic component and improving reception sensitivity.

In order to solve the above problems, the present invention includes the following components.
In addition, the reference numerals of the drawings attached to the respective elements described in the section of each embodiment described later are attached to the respective constituent elements together with parentheses.
As shown in FIGS. 1 to 4, the invention according to claim 1 is a protective glass (watch glass 2), an antenna coil (21) disposed on the lower peripheral portion of the protective glass, and the antenna coil. An electronic apparatus comprising: a display device (liquid crystal display panel 9) disposed on a lower side of the display; and a soft magnetic material (23) provided between the antenna coil and the display device. .

  As shown in FIGS. 5 to 10, the invention described in claim 2 is a protective glass (watch glass 2), an antenna coil (21) disposed below the protective glass, and a bottom of the antenna coil. An electronic device comprising: a circuit board (12) disposed on a side; and a soft magnetic material (30, 31, 32, 36) provided between the antenna coil and the circuit board. is there.

  As shown in FIGS. 10A and 10B, the invention according to claim 3 is a display device (liquid crystal display panel 35) between the antenna coil (21) and the circuit board (12). The electronic apparatus according to claim 2, wherein the soft magnetic material is provided on a lower surface of the display device.

  According to a fourth aspect of the present invention, as shown in FIGS. 5 and 6, a display device (liquid crystal display panel 9) is disposed between the antenna coil (21) and the circuit board (12). The electronic apparatus according to claim 2, wherein a backlight device (backlight panel 10) is disposed on a lower surface of the device, and the soft magnetic material (30) is provided on a lower surface of the backlight device. is there.

  According to the fifth aspect of the present invention, as shown in FIGS. 7 and 8, a display device (liquid crystal display panel 9) is disposed between the antenna coil (21) and the circuit board (12). A holding member (11) for holding a connecting member (interconnector 14) that electrically connects the device and the circuit board is disposed, and the soft magnetic material (31) is placed on the holding member. The electronic apparatus according to claim 2, wherein the electronic apparatus is provided.

  The invention according to claim 6 is characterized in that the soft magnetic material (32) is provided on the upper surface of the circuit board (12) as shown in FIGS. 9 (a) and 9 (b). The electronic device according to claim 2.

  According to the first aspect of the present invention, the soft magnetic material is provided between the antenna coil disposed on the lower peripheral portion of the protective glass and the display device disposed on the lower side of the antenna coil. When magnetic flux is generated in the antenna coil during communication, soft magnetic materials can prevent eddy currents from being generated and loss of magnetic flux in conductive parts such as electronic parts required for electronic equipment. Reception sensitivity can be increased. In this case, particularly, there are almost no conductive parts between the antenna coil and the display device, so that the loss of magnetic flux is extremely small and the reception sensitivity is good. In addition, since the antenna coil is arranged in the lower peripheral part of the protective glass, the antenna coil can be brought closer to the outer surface of the device, thereby shortening the communication distance, thereby also improving the reception sensitivity. Can be increased.

  According to the invention described in claim 2, since the soft magnetic material is provided between the antenna coil arranged under the protective glass and the circuit board arranged under the antenna coil, Similarly to the invention described in Item 1, when magnetic flux is generated in the antenna coil during communication, the conductive coil is disposed between the antenna coil and the circuit board, among electronic components necessary for the electronic device. A soft magnetic material can prevent a magnetic flux from being lost due to an eddy current generated in a conductive component such as an electronic component, thereby improving reception sensitivity. In this case as well, the antenna coil is arranged under the protective glass, so that the antenna coil can be brought closer to the outer surface of the device, thereby shortening the communication distance, thereby also receiving sensitivity. Can be increased.

  According to the third aspect of the present invention, the soft magnetic material is provided on the lower surface of the display device disposed between the antenna coil and the circuit board. Sometimes when magnetic flux is generated in the antenna coil, among conductive parts such as electronic parts necessary for electronic devices, especially conductive parts such as display devices arranged between the antenna coil and the circuit board. The soft magnetic material can prevent the loss of magnetic flux due to the generation of eddy currents, which can improve the reception sensitivity, and it is only necessary to provide a soft magnetic material on the lower surface of the display device, thus simplifying the structure. Therefore, the manufacturing and assembling work can be facilitated, thereby reducing the cost.

  According to the invention described in claim 4, the backlight device is disposed on the lower surface of the display device disposed between the antenna coil and the circuit board, and the soft magnetic material is provided on the lower surface of the backlight device. Thus, as in the second aspect of the invention, when magnetic flux is generated in the antenna coil during communication, among the conductive parts such as electronic parts necessary for the electronic device, particularly between the antenna coil and the circuit board. In addition to being able to prevent eddy currents from being generated and loss of magnetic flux in conductive parts such as display devices and backlight devices arranged in the soft magnetic material, this can improve reception sensitivity, Since it is only necessary to provide a soft magnetic material on the lower surface of the backlight device, the structure is simple, the manufacturing and assembling work can be facilitated, and the cost can be reduced.

  According to the fifth aspect of the present invention, the display device is disposed between the antenna coil and the circuit board, and the connection member that electrically connects the display device and the circuit board is held between the display device and the circuit board. When the magnetic flux is generated in the antenna coil at the time of communication, the electronic component required for the electronic device is provided, as in the case of the invention according to claim 2. Among the components that have conductivity, such as display devices and connection members that are placed between the antenna coil and the circuit board, eddy currents are generated in the components that have conductivity, and magnetic flux is lost. In addition to improving the reception sensitivity, it is only necessary to provide a soft magnetic material for the holding member, so the structure is simple and the manufacturing and assembly work can be facilitated. It is possible to achieve even lower prices.

  According to the invention described in claim 6, since the soft magnetic material is provided on the upper surface of the circuit board, when the magnetic flux is generated in the antenna coil at the time of communication as in the invention described in claim 2, the electronic device In addition to conductive parts such as electronic parts necessary for the circuit, especially conductive parts placed between the antenna coil and the circuit board, eddy currents are generated in the circuit board and the parts mounted on the circuit board. The loss of magnetic flux can be prevented by the soft magnetic material, which can improve the reception sensitivity and also only need to provide the soft magnetic material on the upper surface of the circuit board, so the structure is simple and its manufacture and assembly Work can be facilitated, thereby reducing the price.

(Embodiment 1)
A first embodiment in which the electronic device of the present invention is applied to a wristwatch will be described below with reference to FIGS.
FIG. 1 is an enlarged cross-sectional view showing a wristwatch of the present invention, FIG. 2 is a front view of the watch glass of FIG. 1 removed, and FIG. 2 is a front view of the watch glass of FIG.
As shown in FIGS. 1 and 2, this wristwatch includes a wristwatch case 1 made of synthetic resin. As shown in FIG. 1, a watch glass 2 is attached to the upper part of the watch case 1, and a watch module 3 and a radio module 4 are incorporated in the watch case 1. Further, a synthetic resin back cover 5 is attached to the lower surface of the wristwatch case 1, and a plurality of push button switches 6 are provided on the side surface of the wristwatch case 1 as shown in FIG.

  As shown in FIG. 1, the timepiece module 3 includes an upper housing 7 made of synthetic resin and a lower housing 8 made of synthetic resin. The upper housing 7 is formed in a substantially box shape that is in close contact with the inner peripheral surface of the watch case 1, and the lower housing 8 is formed so as to be disposed in the lower portion in the upper housing 7. A liquid crystal display panel 9, a backlight panel 10, a holding member 11, and a circuit board 12 are arranged in order from the top in the upper housing 7 located on the lower housing 8. A button type battery 13 is arranged.

  In this case, the liquid crystal display panel 9 encloses a liquid crystal between a pair of transparent electrode substrates, and selectively applies a voltage between the pair of electrode substrates to display information such as time. It is an element and is electrically connected to an electrode terminal (not shown) of the circuit board 12 by an interconnector 14. The backlight panel 10 is composed of a planar light emitting element such as an EL light emitting panel (electroluminescence light emitting panel), and is configured to illuminate the liquid crystal display panel 9 from the lower surface side with surface-emitting light. The backlight panel 10 is electrically connected to an electrode terminal (not shown) of the circuit board 12 by a connection member 15 such as a coil spring.

  The holding member 11 is formed in a flat plate shape, and a first insertion hole 16 into which the interconnector 14 is inserted and a second insertion hole 17 into which the connection member 15 is inserted are provided at predetermined positions. When the connector 14 is inserted, the interconnector 14 is held to prevent the interconnector 14 from falling or being displaced, and the connecting member 15 is inserted into the second insertion hole 17 to hold and connect the connecting member 15. The member 15 is configured to prevent the member 15 from falling or misaligned. The circuit board 12 is mounted with various chip components (not shown) such as LSI necessary for the clock function, thereby forming a clock circuit.

  On the other hand, as shown in FIG. 1, the wireless module 4 is arranged corresponding to the lower surface of the parting portion 18 provided on the outer peripheral portion of the lower surface of the watch glass 2. As shown in FIG. 2, the wireless module 4 includes a substantially ring-shaped film substrate 20. An antenna coil 21 is formed in a substantially spiral shape on the upper and lower surfaces of the film substrate 20, and an IC chip 22, which is an RFID chip, is formed on a part of the film substrate 20, that is, the upper surface on the 6 o'clock side. Are provided in an electrically connected state. Thus, when the wireless module 4 brings a wristwatch close to a reader / writer (not shown) of an external device that generates an electromagnetic field, a current flows through the antenna coil 18 by electromagnetic induction due to the electromagnetic field generated by the reader / writer. Thus, data is transmitted to and received from the reader / writer.

  In this case, as shown in FIG. 2 and FIG. 3, the parting part 18 may also be configured by printing on the outer peripheral part of the lower surface of the watch glass 2 except for the part corresponding to the display area 9 a of the liquid crystal display panel 9. Alternatively, a configuration in which a part-printed sheet is attached to the lower surface of the watch glass 2 may be used. In addition, the film substrate 20 is formed in a ring shape having a size surrounding the display area 9 a of the liquid crystal display panel 9, and is positioned below the parting portion 18 provided on the lower surface of the watch glass 2. Is disposed on the upper surface of the hook-shaped protrusion 1 a provided on the inner peripheral surface of the first electrode via a soft magnetic material 23.

  The soft magnetic material 23 is a ferromagnet having a property of attracting to a magnet, and is made of a material used for an electromagnet that follows a change in an external magnetic field, a magnetic core material of a transformer, or the like. That is, the ferromagnetic material is classified into a hard magnetic material and a soft magnetic material. The hard magnetic material is magnetized by an external magnetic field and then remains magnetized even if the external magnetic field is removed. It is a substance that loses magnetization and returns to its original state when the is removed. The soft magnetic material 23 may be formed in a sheet shape and affixed on the hook-shaped protrusion 1a of the wristwatch case 1. Alternatively, the soft magnetic material 23 may be mixed with an adhesive to add a soft magnetic material powder onto the hook-shaped protrusion 1a. The structure applied to may be used.

  According to such a wristwatch, information such as the time displayed on the display area 9a of the liquid crystal display panel 9 can be seen from the outside of the wristwatch case 1 through the watch glass 2 as well as a normal wristwatch. When the wristwatch case 1 is brought close to a reader / rider (not shown) that is an external device that generates a current, an electromagnetic field generated by the reader / lider causes an electric current to flow through the antenna coil 21 of the wireless module 4 due to electromagnetic induction, thereby Data can be transmitted and received between the lidar and the wireless module 4.

  At this time, the soft magnetic material 23 is placed between the antenna coil 21 of the wireless module 4 disposed in the peripheral portion on the lower surface side of the watch glass 2 and the liquid crystal display panel 9 disposed below the antenna coil 21. Therefore, when magnetic flux is generated in the antenna coil 21 at the time of communication, there are conductive parts such as various electronic parts incorporated in the watch case 1, such as the liquid crystal display panel 9, the backlight panel 10, and the circuit. The soft magnetic material 23 can prevent the magnetic flux from being lost due to the generation of eddy currents in components such as the substrate 12, thereby increasing the reception sensitivity of the antenna coil 21. In this case, since there are almost no conductive parts such as electronic parts arranged between the antenna coil 21 and the liquid crystal display panel 9 in particular, the loss of magnetic flux is extremely small, thereby further improving the reception sensitivity. Can be increased.

  Further, in this wristwatch, the antenna coil 21 is disposed in the peripheral portion on the lower surface side of the watch glass 2, so that the antenna coil 21 can be brought close to the outer surface of the watch, and thus the watch glass 2 is attached to a reader / rider as an external device. By reducing the distance, the communication distance can be shortened, and the reception sensitivity of the antenna coil 21 can also be increased. In this case, even if the wireless module 4 is arranged on the lower surface side of the watch glass 2, the wireless module 4 can be hidden by the parting part 18 provided on the lower surface of the watch glass 2, so that both the appearance and the design are possible. Preferred ones can be obtained.

  In the first embodiment, the case where the soft magnetic material 23 is provided on the upper surface of the hook-shaped protrusion 1a of the watch case 1 and is disposed on the lower surface of the antenna coil 21 of the wireless module 4 has been described. 23 does not have to be provided on the upper surface of the hook-shaped protrusion 1a of the watch case 1 and disposed on the lower surface of the antenna coil 21, and the antenna coil 21 is not provided with the hook-shaped protrusion of the watch case 1 as in the modification shown in FIG. A structure in which the soft magnetic material 23 is provided on the upper surface of 1a so as to correspond to the antenna coil 21 on the lower surface of the hook-shaped protrusion 1a may be employed. Even in such a structure, since the soft magnetic material 23 is disposed between the watch glass 2 and the liquid crystal display panel 9, the same effects as those of the first embodiment can be obtained.

(Embodiment 2)
Next, a second embodiment in which the electronic apparatus of the present invention is applied to a wristwatch will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS. 1-3.
This wristwatch has a configuration in which a soft magnetic material 30 is provided on the lower surface of the backlight panel 10 positioned between the antenna coil 21 and the circuit board 12 of the wireless module 4, and the other configuration is the same as that of the first embodiment. Yes.

  Also in this case, the soft magnetic material 30 is made of a material used for an electromagnet or a magnetic core material of a transformer that follows a change in an external magnetic field, like the soft magnetic material 23 of the first embodiment, and is formed into a sheet shape and back. The structure may be affixed to the lower surface of the light panel 10 or may be a structure in which a soft magnetic material powder is mixed into an adhesive and applied to the lower surface of the backlight panel 10. In this case, as shown in FIGS. 6A and 6B, a coil spring or the like for electrically connecting the backlight panel 10 and the circuit board 12 is provided at a predetermined portion of the soft magnetic material 30. An insertion hole 30a for connection through which the connection member 15 is inserted is provided.

  In such a wristwatch, since the soft magnetic material 30 is provided on the lower surface of the backlight panel 10 positioned between the antenna coil 21 of the wireless module 4 and the circuit board 12, the antenna coil 21 is used during communication as in the first embodiment. Among the components having conductivity such as various electronic components incorporated in the wristwatch case 1 when the magnetic flux is generated, particularly the liquid crystal display panel 9 disposed between the antenna coil 21 and the circuit board 12 and the back. The soft magnetic material 30 can prevent the magnetic flux from being lost due to the generation of eddy currents in conductive parts such as the light panel 10, thereby increasing the reception sensitivity of the antenna coil 21.

  In this case, it is only necessary to provide the soft magnetic material 30 on the lower surface of the backlight panel 10 in particular, so that the structure is simple, and the watch module 3 can be easily manufactured and assembled as in the case of existing products. As a result, the price can be reduced. Also in this case, since the antenna coil 21 is disposed in the peripheral portion on the lower surface side of the watch glass 2, the antenna coil 21 can be brought close to the outer surface of the wristwatch, and therefore, the watch glass is attached to the reader / rider as an external device. By bringing 2 closer, the communication distance can be shortened, and the reception sensitivity of the antenna coil 21 can also be increased.

(Embodiment 3)
Next, with reference to FIGS. 7A and 7B, a third embodiment in which the electronic apparatus of the present invention is applied to a wristwatch will be described. In this case, the same reference numerals are given to the same portions as those in the second embodiment shown in FIGS.
This wristwatch has a configuration in which a soft magnetic material 31 is provided on the upper surface of the holding member 11 positioned between the antenna coil 21 and the circuit board 12 of the wireless module 4, and the other configuration is substantially the same as that of the second embodiment. Yes.

  Also in this case, the soft magnetic material 31 is made of a material used for an electromagnet that follows a change in an external magnetic field, a magnetic core material of a transformer, and the like, like the soft magnetic materials 23 and 30 of the first and second embodiments. The structure may be formed and affixed to the holding member 11, or may be a structure in which a soft magnetic material powder is mixed into the adhesive and applied to the holding member 11. In this case, insertion holes 31 a and 31 b into which the interconnector 14 and the connection member 15 are inserted are provided at predetermined positions of the soft magnetic material 31 corresponding to the first and second insertion holes 16 and 17 of the holding member 11. It has been.

  Also in such a wristwatch, since the soft magnetic material 31 is provided on the upper surface of the holding member 11 positioned between the antenna coil 21 of the wireless module 4 and the circuit board 12, the antenna coil 21 is used during communication as in the second embodiment. Among the components having conductivity such as various electronic components incorporated in the wristwatch case 1 when the magnetic flux is generated, particularly the liquid crystal display panel 9 disposed between the antenna coil 21 and the circuit board 12 and the back. The soft magnetic material 31 can prevent the magnetic flux from being lost due to the generation of eddy currents in the conductive parts such as the light panel 10, the interconnector 14, and the connecting member 15, thereby improving the reception sensitivity of the antenna coil 21. Can be increased.

  In this case, since the soft magnetic material 31 may be provided on the upper surface of the holding member 11, the structure is simple, and the watch module 3 can be easily manufactured and assembled as in the case of existing products. Price can also be achieved. Also in this case, since the antenna coil 21 is arranged in the peripheral portion on the lower surface side of the watch glass 2, the communication distance can be shortened by bringing the watch glass 2 close to the reader / rider which is an external device. This also increases the reception sensitivity of the antenna coil 21.

  In the third embodiment, the case where the soft magnetic material 31 is provided on the upper surface of the holding member 11 is described. However, the soft magnetic material 31 is not necessarily provided on the upper surface of the holding member 11, and the lower surface of the holding member 11 is not necessarily provided. As shown in FIG. 8, a structure in which the soft magnetic material 31 is embedded in the holding member 11 or a structure in which the holding member 11 itself is formed of a soft magnetic material may be used. Also in this case, each soft magnetic material 31 is provided with insertion holes 31a and 31b into which the interconnector 14 and the connection member 15 are inserted. Any of these structures has the same effects as the third embodiment.

(Embodiment 4)
Next, with reference to FIGS. 9A and 9B, a fourth embodiment in which the electronic apparatus of the present invention is applied to a wristwatch will be described. Also in this case, the same reference numerals are given to the same portions as those in the second embodiment shown in FIGS.
This wristwatch has a configuration in which a soft magnetic material 32 is provided on the upper surface of the circuit board 12 located on the lower side of the antenna coil 21 of the wireless module 4, and the other configuration is substantially the same as that of the second embodiment. In this case, on the upper surface of the circuit board 12, a chip component 12a such as an LSI necessary for a clock function is provided, and various electrode terminals 12b and 12c are provided.

  Similarly to the soft magnetic materials 23, 30, and 31 of the first to third embodiments, the soft magnetic material 32 is made of a material used for an electromagnet that follows a change in an external magnetic field, a magnetic core material of a transformer, and the like, and is formed in a sheet shape. The structure may be affixed to the upper surface of the circuit board 12, or may be a structure in which a soft magnetic material powder is mixed in an adhesive and applied to the upper surface of the circuit board 12. Also in this case, through holes 33 and 34 for inserting the interconnector 14 and the connecting member 15 into contact with the electrode terminals 12b and 12c of the circuit board 12 are provided at predetermined positions of the soft magnetic material 32, respectively. It is provided corresponding to the electrode terminals 12b and 12c.

  Also in such a wristwatch, since the soft magnetic material 32 is provided on the upper surface of the circuit board 12 positioned below the antenna coil 21 of the wireless module 4, the magnetic flux is applied to the antenna coil 21 during communication as in the second embodiment. Among the components having conductivity such as various electronic components incorporated in the wristwatch case 1, the liquid crystal display panel 9 and the backlight panel disposed between the antenna coil 21 and the circuit board 12 are used. 10, in addition to conductive parts such as the interconnector 14 and the connection member 15, eddy currents are generated in the conductive parts such as the circuit board 12 and the chip part 12a mounted on the circuit board 12, and the magnetic flux is lost. Can be prevented by the soft magnetic material 32, whereby the receiving sensitivity of the antenna coil 21 can be increased.

  In this case, since the soft magnetic material 32 may be provided on the upper surface of the circuit board 12, the structure is simple, and the watch module 3 can be easily manufactured and assembled as in the case of existing products. Price can also be achieved. Also in this case, since the antenna coil 21 is arranged in the peripheral portion on the lower surface side of the watch glass 2, the communication distance can be shortened by bringing the watch glass 2 close to the reader / rider which is an external device. This also increases the reception sensitivity of the antenna coil 21.

(Embodiment 5)
Next, a fifth embodiment in which the present invention is applied to a wristwatch will be described with reference to FIGS. 10 (a) and 10 (b). Also in this case, the same reference numerals are given to the same portions as those in the second embodiment shown in FIGS.
In this wristwatch, a reflective liquid crystal display panel 35 is disposed between the antenna coil 21 of the wireless module 4 and the circuit board 12, and a soft magnetic material 36 is provided on the lower surface of the reflective liquid crystal display panel 35. Other than this, the configuration is substantially the same as in the second embodiment.

  In this case, the liquid crystal display panel 35 is a reflective type in which a reflective plate is provided on the lower surface of the lower electrode substrate among the pair of transparent electrode substrates, and the backlight panel 10 is not required. . Further, the soft magnetic material 36 provided on the lower surface of the liquid crystal display panel 35 is similar to the soft magnetic materials 23 and 30 to 32 of the first to fourth embodiments, such as an electromagnet that follows a change in an external magnetic field, a magnetic core material of a transformer, and the like. The material may be formed in a sheet shape and attached to the lower surface of the liquid crystal display panel 35. Alternatively, the soft magnetic material powder may be mixed with an adhesive and applied to the lower surface of the liquid crystal display panel 35. But it ’s okay.

  Also in such a wristwatch, since the soft magnetic material 36 is provided on the lower surface of the liquid crystal display panel 35 located between the antenna coil 21 and the circuit board 12 of the wireless module 4, as in the second embodiment, during communication, A liquid crystal display panel disposed between the antenna coil 21 and the circuit board 12 among conductive parts such as various electronic parts incorporated in the watch case 1 when magnetic flux is generated in the antenna coil 21. The soft magnetic material 36 can prevent the magnetic flux from being lost due to the generation of eddy currents in the conductive parts such as 35, and thereby the reception sensitivity of the antenna coil 21 can be increased.

  In this case, it is only necessary to provide the soft magnetic material 36 on the lower surface of the liquid crystal display panel 35. Therefore, the structure is simple, and the manufacturing and assembling work of the timepiece module 3 can be facilitated similarly to the existing products. The price can also be reduced. Also in this case, since the antenna coil 21 is arranged in the peripheral portion on the lower surface side of the watch glass 2, the communication distance can be shortened by bringing the watch glass 2 close to the reader / rider which is an external device. This also increases the reception sensitivity of the antenna coil 21.

As the soft magnetic material, a magnetic sheet obtained by dispersing and blending a metal magnetic powder in a resin to form a sheet may be used.
In the first to fifth embodiments described above, the case where the present invention is applied to a wristwatch as an electronic device has been described. Can do.

It is an expanded sectional view of the wristwatch to which this invention is applied. (Embodiment 1) It is a front view of the state which removed the timepiece glass from the wristwatch case of FIG. It is the front view which showed the timepiece glass of FIG. FIG. 6 is an enlarged cross-sectional view of a wrist watch showing a modification of the first embodiment. It is an expanded sectional view of the wristwatch to which this invention is applied. (Embodiment 2) The backlight panel of FIG. 5 is shown, (a) is the front view of the backlight panel, (b) is sectional drawing in the AA arrow. The holding member of the wristwatch to which this invention is applied is shown, (a) is a front view of the holding member, and (b) is a sectional view taken along the line BB. (Embodiment 3) It is sectional drawing of the holding member which showed the modification of Embodiment 3. The circuit board of the wristwatch which applied this invention is shown, (a) is the front view of the circuit board, (b) is sectional drawing in the CC arrow. (Embodiment 4) 1 shows a liquid crystal display panel of a wristwatch to which the present invention is applied, in which (a) is a front view of the liquid crystal display panel, and (b) is a cross-sectional view taken along line DD. (Embodiment 5)

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Watch case 2 Watch glass 3 Watch module 4 Wireless module 9, 35 Liquid crystal display panel 10 Backlight panel 11 Holding member 12 Circuit board 14 Interconnector 15 Connection member 18 Parting part 20 Film board 21 Antenna coil 22 IC chip 23, 30, 31, 32, 36 Soft magnetic material

Claims (6)

Protective glass,
An antenna coil disposed on the lower periphery of the protective glass;
A display device disposed below the antenna coil;
An electronic apparatus comprising: a soft magnetic material provided between the antenna coil and the display device. Protective glass,
An antenna coil disposed under the protective glass;
A circuit board disposed under the antenna coil;
An electronic apparatus comprising: a soft magnetic material provided between the antenna coil and the circuit board.   The electronic apparatus according to claim 2, wherein a display device is disposed between the antenna coil and the circuit board, and the soft magnetic material is provided on a lower surface of the display device.   A display device is disposed between the antenna coil and the circuit board, a backlight device is disposed on a lower surface of the display device, and the soft magnetic material is provided on a lower surface of the backlight device. The electronic device according to claim 2.   A display device is disposed between the antenna coil and the circuit board, and a holding member is disposed between the display device and the circuit board to hold a connection member that electrically connects the two. The electronic apparatus according to claim 2, wherein the soft magnetic material is provided on a holding member. The electronic apparatus according to claim 2, wherein the soft magnetic material is provided on an upper surface of the circuit board.

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