electronic equipment

Abstract

To provide: an electronic apparatus having an antenna which can easily cope with design changes and so forth; an adjustment method of antenna characteristics; and an assembling method of the electronic apparatus.SOLUTION: A clock body 100 which is an electronic apparatus has: a body case 1; an antenna element 4 disposed on the body case 1; a machine screw 71, as a first adjustment member, which is made of a metallic material, and which has one end side disposed in a manner coming into contact with or coming close to the antenna element 4, and has the other end side disposed inside the body case 1; a hole part 12, as a cylindrical part, which is provided on the body case 1 and is made of a metallic material, and into which the other end side of the machine screw 71 is inserted; and a nut 72, as a second adjustment member, which is made of a dielectric, and which is disposed inside the hole part 12 so as to be interposed between the hole part 12 and the machine screw 71.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an electronic device Regarding . [Background technology]

[0002] 2. Description of the Related Art Conventionally, electronic devices such as wristwatches are known that are capable of receiving satellite radio waves to obtain accurate time information, position information, and the like. For example, Patent Document 1 describes a configuration in which a ring-shaped antenna (referred to as a "ring antenna" in Patent Document 1) is placed on top of the main body case (referred to as a "casing exterior" in Patent Document 1), and the bottom surface of the main body case functions as a ground plane. The characteristics (frequency, gain) of an antenna are affected by the components placed around it and the materials of those components, etc. Therefore, in order to obtain the desired frequency and other characteristics, it is necessary to adjust the antenna's placement position and structure, the shape of the surrounding components, etc., to match the frequency, etc. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-183437 Summary of the Invention [Problem to be solved by the invention]

[0004] However, for example, once the placement position and structure of the antenna, the shape of the peripheral components, etc. have been determined, the design of the electronic device may be changed. In such cases, it becomes necessary to adjust the characteristics of the antenna, such as the frequency, and in some cases, the antenna design must be redone, which increases the time and cost involved.

[0005] The present invention has been made in view of the above circumstances, and provides an electronic device having an antenna that can easily accommodate design changes, etc. vessel The purpose is to provide [Means for solving the problem]

[0006] In order to solve the above problems, the electronic device according to the present invention comprises: a main body case formed of resin; an annular antenna element disposed on one surface of the main body case; a third adjustment member formed of a metal material, one end of which is disposed within the antenna element and the other end of which is disposed within the main body case; a conductive portion disposed on the other surface of the main body case; a fourth adjustment member made of a metal material, one end of which is disposed within the conductor portion and the other end of which is disposed within the main body case; and The third adjustment member and the fourth adjustment member are disposed at a predetermined distance. It is characterized by: [Effects of the Invention]

[0007] According to the present invention, an electronic device having an antenna that can easily accommodate design changes, etc. vessel This has the effect of being able to provide. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a perspective view showing the main parts of a timepiece body, which is an electronic device according to a first embodiment. [Figure 2] 2 is a cross-sectional view of the watch body shown in FIG. 1 taken along line II-II. [Figure 3] 3 is an enlarged cross-sectional view of the periphery of the characteristic adjustment unit indicated by the dashed-dotted line frame III in FIG. 2. FIG. [Figure 4] 3. FIG. 4 is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion indicated by the dashed-dotted frame III in FIG. 2, showing a state in which the length of the screw is longer than that in FIG. [Figure 5] 10 is a graph showing the tendency of the results of a simulation of the relationship between the length of the screw and the frequency of the antenna. [Figure 6] FIG. 10 is a cross-sectional view of the main part of a watch body, which is an electronic device according to a second embodiment. [Figure 7] 7 is an enlarged cross-sectional view of the periphery of the characteristic adjusting section indicated by the dashed-dotted line frame VII in FIG. 6. [Figure 8]8 is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion indicated by the dashed-dotted line frame VII in FIG. 6, showing a state in which the height of the nut is higher than that in FIG. 7. [Figure 9] 10 is a graph showing the tendency of the results of a simulation of the relationship between the height of the nut and the frequency of the antenna. [Figure 10] FIG. 11 is an enlarged cross-sectional view of the periphery of a characteristic adjustment unit in a third embodiment. [Figure 11] 11 is an enlarged cross-sectional view of the periphery of a characteristic adjustment section in the third embodiment, showing a state in which the length of the screw is longer than that in FIG. 10. [Figure 12] FIG. 10 is an enlarged cross-sectional view of the periphery of a characteristic adjustment unit in a fourth embodiment. [Figure 13] 13 is an enlarged cross-sectional view of the periphery of the characteristic adjustment section in the fourth embodiment, showing a state in which the height of the nut is higher than that in FIG. 12. FIG. [Figure 14] FIG. 10 is an enlarged cross-sectional view of the periphery of a characteristic adjustment unit in a modified example of the first embodiment. [Figure 15] FIG. 10 is an enlarged cross-sectional view of the periphery of a characteristic adjustment section in a modified example of the second embodiment. [Figure 16] FIG. 10 is an enlarged cross-sectional view showing the configuration of a modified example of the characteristic adjustment section. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] 1 to 5, a first embodiment of an electronic device, an antenna characteristic adjustment method, and an electronic device assembly method according to the present invention will be described. In this embodiment, the electronic device will be described as a watch body as an example. It should be noted that the embodiments described below are subject to various limitations that are technically preferable for carrying out the present invention, but the scope of the present invention is not limited to the following embodiments and illustrated examples.

[0010] Fig. 1 is a perspective view showing the main part of a watch body, which is an electronic device according to this embodiment, and Fig. 2 is a cross-sectional view of the watch body taken along line II-II of Fig. 1. As shown in Figures 1 and 2, the watch body 100 in this embodiment has a case (hereinafter referred to as the "main body case 1" in this embodiment) formed in the shape of a hollow short column that is open on the top and bottom (front and back of the watch) in the thickness direction (Z-axis direction in Figure 2).

[0011] In the illustrated example, the main body case 1 is formed in a cylindrical shape that is approximately circular when viewed from above. The shapes of the main body case 1 and the watch body 100 that includes it are not limited to the illustrated example. For example, they may be elliptical when viewed from above, or may be polygonal pillar-shaped. In this embodiment, the main body case 1 is made of a metal material such as SUS, titanium, etc. However, the material for forming the main body case 1 is not limited to the examples given here.

[0012] An opening 11 on the front side (the visible side, or upper side of the watch) of the main body case 1 is provided with a light-transmitting crystal member 2 made of transparent glass or the like, which is provided to cover the opening 11. A back cover 3 is attached to the back side (the non-visible side, or lower side of the watch) of the main body case 1 as a lid member that closes the opening. In this embodiment, the back cover 3 is made of a conductor such as various metallic materials, for example, SUS or titanium, and functions as a GND (ground plane). The material of the back cover 3 is not limited to those exemplified here. The back cover 3 may be made of the same material as the main case 1, or may be made of a different material.

[0013] An antenna element 4 constituting an antenna (for example, a patch antenna) is disposed in the main body case 1. In this embodiment, the antenna element 4 is a bezel member formed in an annular shape, and is disposed on the upper side of the main body case 1 (the front side of the main body case 1, the viewing side of the watch). The shape of the antenna element 4 is not limited to the illustrated example. Here, the term "annular" broadly includes not only circular annular shapes in a plan view, but also elliptical and rectangular shapes that are continuous. Furthermore, the annular shape referred to here is not limited to a completely closed ring shape, but also broadly includes shapes with gaps in some parts, such as a C-shape.

[0014] The material from which the antenna element 4 is made is not particularly limited, but if the material has low conductivity (high resistivity), there is a possibility that a sufficient antenna gain may not be obtained. For this reason, it is preferable to use a metallic material with a certain level of conductivity or higher (i.e., a certain level of resistivity or lower) as the material for forming the antenna element 4, such as stainless steel (SUS) or titanium. Also, since it is undesirable for the watch body 100, as an electronic device, to be too heavy, it is preferable to form the antenna element 4 from a material that is as light as possible.

[0015] On the back cover 3, a substrate 6 having an electric circuit section and the like (not shown) is arranged. A connector member 61 is connected to the antenna element 4, and the antenna element 4 is connected to the electric circuit section of the substrate 6 by this connector member 61. The connector member 61 is a contact means for feeding power, and the antenna element 4 is connected via the connector member 61 to an LC circuit or the like as an electric circuit section mounted on the substrate 6, for example.

[0016] In addition, a dielectric member 5 made of a dielectric material such as resin is disposed between the antenna element 4 and the main body case 1. The dielectric member 5 is formed in a ring shape, for example, substantially the same as the ring-shaped antenna element 4, and is disposed so as to overlap the antenna element 4.

[0017] By interposing a dielectric member 5, which is an insulating member, between the antenna element 4 and the metal main body case 1, direct contact between the antenna element 4 and the metal main body case 1 can be prevented, thereby avoiding the occurrence of a short circuit. The dielectric member 5 only needs to be wide enough to stably support the antenna element 4 so that the antenna element 4 does not come into contact with the main body case 1, and does not necessarily have to overlap with the antenna element 4 in the same shape. In addition, the dielectric member 5 may be an O-ring or the like provided between the antenna element 4 and the main body case 1, in which case the dielectric member 5 may function as a sealing means (second sealing means) for making the inside of the main body case 1 watertight.

[0018] A characteristic adjusting section 7 for adjusting antenna characteristics is provided on the lower side (back side, non-viewing side) of the antenna element 4. The characteristic adjusting section 7 has a first adjusting member, a cylindrical section, and a second adjusting member. 1, in this embodiment, four characteristic adjustment units 7 are arranged at approximately equal intervals along the circumferential surface of the main body case 1. The number of characteristic adjustment units 7 is not limited to that shown in the example, and may be three or less, or five or more.

[0019] 3 and 4 are enlarged cross-sectional views of the area surrounding the characteristic adjustment unit enclosed by the dashed-dotted frame III in FIG. 3 and 4, a recess 41 is formed on the lower surface (back surface, non-viewing side surface) of the antenna element 4 at a position corresponding to the position where the characteristic adjustment unit 7 is to be provided. An internal thread is formed on the inner circumferential surface of the recess 41. In each recess 41, a screw 71 (so-called set screw or the like) having a male thread formed on at least one end thereof to be engaged with a female thread cut on the inner peripheral surface of the recess 41 is screwed.

[0020] In this embodiment, the screw 71 is a first adjustment member that is made of a metal material such as SUS, and has one end that contacts the antenna element 4 and the other end that is disposed inside the main body case 1. From the perspective of the appearance of the timepiece body 100, it is desirable that the screw 71 serving as the first adjustment member be entirely located on the non-visible side of the antenna element 4. For this reason, for example, in this embodiment, the recess 41 formed on the back side of the antenna element 4 has a depth that does not penetrate to the front surface (viewing side) of the antenna element 4. As a result, the tip of the screw 71 screwed into the recess 41 does not protrude to the viewing side of the antenna element 4, but remains on the back side, and does not affect the appearance.

[0021] The screw 71 as the first adjustment member is only required to be arranged so as to come into contact with the antenna element 4, and is not limited to being fixed to the antenna element 4 by screwing or the like as in the illustrated example. It may also be an unthreaded pin or the like that is simply placed in the recess 41 by press-fitting or the like. In addition, the first adjustment member may be capacitively coupled to the antenna element 4, in which case one end of the member does not need to be in contact with the antenna element 4, as long as it is positioned close enough to be capacitively coupled to the antenna element 4.

[0022] A hole 12 is formed in the peripheral wall of the main body case 1 at a portion where the characteristic adjustment section 7 is provided, and penetrates in the thickness direction (Z-axis direction in FIG. 2). In this embodiment, the hole 12 formed in the metal main body case 1 is made of a metal material and forms a cylindrical portion into which the other end of the first adjustment member (the screw 71 in this embodiment) is inserted. The cylindrical hole 12 in this embodiment is formed in the main body case 1 in contact with the back cover 3 serving as GND, and is a conductor having the same potential as GND. As shown in Figures 3 and 4, a through hole 51 is also provided in the dielectric member 5 at a position corresponding to the hole portion 12, and the screw 71 can be inserted into the hole portion 12 through the through hole 51.

[0023] Furthermore, within the hole portion 12 as the tubular portion, a nut 72 as a second adjustment member formed of a dielectric material such as resin is arranged so as to be interposed between the hole portion 12 as the tubular portion and the screw 71 as the first adjustment member. The nut 72 of this embodiment has a height that is approximately the same as the thickness of the main body case 1 (the height of the main body case 1, the height in the Z-axis direction in FIG. 2). The end of the screw 71 that is inserted into the hole 12 (the lower end in Figures 3 and 4) is received in the nut 72, so that even when the screw 71 is in its longest state, it will not come into contact with the main body case 1 (such as the hole 12 formed in the main body case 1) or the metal back cover 3. In addition, in this embodiment, the screw 71 is a set screw with a male thread formed on its outer surface from one end to the other end, and the inner surface of the nut 72 is formed with a female thread that screws into the male thread formed on the screw 71.

[0024] In this embodiment, screw 71 as a first adjustment member and nut 72 as a second adjustment member are threadedly engaged to make the inside of main body case 1 watertight. In this case, the threaded portions of screw 71 and nut 72 (i.e., the male thread of screw 71 and the female thread of nut 72) function as sealing means for making the inside of main body case 1 watertight. It should be noted that the screw 71 and nut 72 do not necessarily have to be threaded together, and a first adjustment member such as a simple pin may be received by a second adjustment member fitted into the hole 12 . In this case, as a sealing means (first sealing means) for making the inside of the main body case 1 watertight, a gasket or O-ring or the like may be separately provided around the axis of the screw 71, etc., to seal the space between the cylindrical hole portion 12 or the nut 72, which is the second adjustment member, and the screw 71, which is the first adjustment member.

[0025] Next, a method for assembling the watch body as an electronic device in this embodiment and a method for adjusting the antenna characteristics will be described. Note that, in the following embodiment, the antenna characteristics adjustment method will be described as adjusting the antenna frequency, but the antenna characteristics that can be adjusted with this configuration are not limited to frequency.

[0026] When assembling the watch body 100, holes 12 are formed in the peripheral wall of the metal body case 1 at predetermined positions in the thickness direction. Also, a circuit board 6 and various other electronic components are placed inside the body case 1. Meanwhile, a recess 41 is provided on the back side (lower side, non-visible side) of the annular antenna element 4 at a position that corresponds to the hole 12 on the main body case 1 side in the assembled state, and a female thread is formed on the inner circumferential surface of the recess 41. Then, one end of a screw 71, which is a first adjustment member and has a male thread formed on the outer circumferential surface, is screwed into the recess 41. Once all the screws 71 (four in the example shown in Figure 1) have been fitted into the recesses 41 of the antenna element 4, the antenna element 4 is placed on the upper side of the main body case 1, and the other end (free end) of the screws 71 attached to the back surface of the antenna element 4 is inserted into the hole 12 of the main body case 1.

[0027] Furthermore, nut 72, which is a second adjustment member, is inserted from below into hole 12, which is a through-hole, and the male thread of screw 71 is screwed onto the female thread of nut 72. This results in a state in which nut 72, which is a second adjustment member, is interposed between hole 12, which is a cylindrical portion that is a conductor portion with the same potential as GND, and screw 71, which is a first adjustment member. In other words, a cylindrical conductor with GND potential is arranged on the outer periphery of metal screw 71 and the resin nut 72 that surrounds it. When the nut 72 is screwed in until the entirety of the nut 72 is inserted into the hole 12, the antenna characteristics (frequency in this embodiment) in this state are verified. If the verification result shows that the antenna is in a state of resonance with radio waves of the desired frequency, the adjustment of the antenna characteristics is terminated. On the other hand, if the verification results show that the antenna is not in a state of resonance with the radio wave of the desired frequency, the antenna characteristics are further adjusted. Specifically, the adjustment is performed as follows.

[0028] FIG. 5 is a graph showing the tendency of the results of a simulation of the relationship between the length of the screw and the frequency (gain peak frequency) of the antenna. When the height (length) of the nut 72 is constant as in this embodiment (Figures 3 and 4 show the case where the nut 72 is provided over the entire height of the main body case 1), as shown in Figure 5, it can be seen that the antenna frequency [GHz] tends to decrease as the length [mm] of the screw 71 increases. That is, in this embodiment, the screw 71 is a metal member that contacts the antenna element 4, but as the length [mm] of the screw 71 increases, the overlap between the resin nut 72 and the metal screw 71 in the hole 12, which serves as a conductor having the same potential as the GND and a cylindrical portion, increases accordingly. This increases the electrostatic capacitance formed between the GND and the antenna element 4 (i.e., the capacitance of the capacitor formed between the antenna element 4 and the GND). This tends to lower the antenna frequency.

[0029] Therefore, if verification reveals that the current antenna frequency is higher than the desired frequency, the length of the screw 71, which is the first adjustment member, is increased as shown in Figure 4. This increases the capacitance between the antenna element 4 and the GND (back cover 3), lowering the antenna frequency. Conversely, if the current antenna frequency is lower than the desired frequency, the length of the first adjustment member, screw 71, is shortened. This reduces the capacitance between antenna element 4 and GND (back cover 3), and increases the antenna frequency. In this manner, the length of the screw 71 is adjusted until the antenna frequency reaches a desired level.

[0030] As described above, in this embodiment, the characteristic adjustment parts 7 are provided at four locations around the circumference of the main body case 1, and the length of the screws 71 may be adjusted at all four of these characteristic adjustment parts 7, or at any one of them. When adjustment is performed by a plurality of characteristic adjustment sections 7, the adjustment amount may be uniform, or the adjustment amount may vary depending on the characteristic adjustment section 7. The adjustments may be simulated in advance, and when the watch body 100 is assembled, each component may be assembled in a state set based on the results of the simulation.

[0031] When the antenna frequency reaches the desired frequency, the adjustment of the antenna characteristics is completed, and the back cover 3 is attached from the bottom of the main body case 1 to close the bottom opening. At this time, by arranging the back cover 3 so as to cover the resin nut 72 as shown in FIGS. 3 and 4, the resin nut 72 can be hidden so that it cannot be seen from the outside. Furthermore, fixing means with a good appearance, such as metal screws, may be used to fix the back cover 3 to the main case 1. This allows the watch body 100 to have a good appearance. This completes the assembly of the watch body 100.

[0032] In such a configuration, by finely adjusting the length of the screw 71, the antenna characteristics (frequency, etc.) can be adjusted to a desired level.

[0033] As described above, according to this embodiment, the watch body 100 as an electronic device comprises the body case 1, the annular antenna element 4 arranged on the upper side of the body case 1, a screw 71 as a first adjustment member formed of a metal material and arranged in contact with the antenna element 4 and the other end arranged within the body case 1, a hole 12 formed of a metal material as a cylindrical portion into which the other end of the screw 71 is inserted, and a nut 72 as a second adjustment member formed of a dielectric material and arranged within the hole 12 and interposed between the hole 12 and the screw 71. With this configuration, even if the design of the watch body 100 as an electronic device is changed after the placement position and structure of the antenna (antenna element 4) and the shape of the peripheral components have been decided, the frequency and other characteristics of the antenna can be easily adjusted using the screw 71 as the first adjustment member and the nut 72 as the second adjustment member, without the effort and cost of starting over from scratch in the antenna design. This makes it possible to easily and accurately adjust the antenna characteristics, such as frequency, even if changes are made to various parts after the structure and various designs of the watch body 100 as an electronic device have been decided. Furthermore, because the antenna characteristics can be accurately adjusted in the watch body 100 (electronic device) as a finished product, the antenna's performance can be fully utilized, making it possible to provide a watch body 100 (electronic device) equipped with a highly sensitive antenna. It should be noted that the first adjustment member (screw 71) is not limited to being arranged with one end in contact with the antenna element 4. The first adjustment member may be arranged in a certain proximity to the antenna element 4 so as to be capable of capacitive coupling with the antenna element 4, and there is a wide degree of freedom in the arrangement of the member that functions as the first adjustment member.

[0034] In addition, in this embodiment, the degree of overlap (the extent of the overlapping range) between the screw 71 as the first adjustment member and the nut 72 as the second adjustment member within the hole portion 12, which is a cylindrical portion, can be adjusted. Specifically, by changing the length of the screw 71 as the first adjustment member inserted into the cylindrical hole portion 12, the degree of overlap (width of overlap range) between the screw 71 and the nut 72 as the second adjustment member within the hole portion 12 can be adjusted. This makes it possible to easily adjust antenna characteristics such as antenna frequency according to the design of the electronic device into which the antenna is incorporated. In this embodiment, the adjustment is performed by changing the length of the screw 71, so the nuts 72 can be of the same shape and size. This makes it suitable for mass production.

[0035] Furthermore, when the first adjustment member is a metal screw 71 as in this embodiment, it is relatively easy to manufacture and make minor adjustments, and it is possible to prevent an increase in costs.

[0036] Furthermore, when the second adjustment member is formed of resin and is a nut 72 having a shape corresponding to the first adjustment member (in this embodiment, screw 71), as in this embodiment, it can be manufactured relatively easily, and cost increases can be prevented.

[0037] In this embodiment, the screw 71 serving as the first adjustment member is entirely disposed on the non-visual side of the antenna element 4. This makes it possible to avoid the effects on the appearance of the electronic device (watch body 100) that would be caused by providing the screws 71, resulting in an electronic device (watch body 100) with excellent design.

[0038] In this embodiment, the male thread of the screw 71 serving as the first adjusting member and the female thread of the nut 72 serving as the second adjusting member are screwed together. Therefore, the threaded portion between the male and female screws functions as a sealing means for making the inside of the main body case 1 watertight, and the watertightness of the inside of the main body case 1 can be ensured without providing a separate sealing means.

[0039] The sealing means for making the inside of the main body case 1 watertight is not limited to the threaded portion between the male and female threads. For example, a gasket, O-ring, or the like may be provided around the axis of the screw 71 serving as the first adjustment member as a sealing means (first sealing means) for making the inside of the main body case 1 watertight by sealing the gap between the cylindrical hole 12 or the nut 72 serving as the second adjustment member and the screw 71 serving as the first adjustment member. In this case, the watertightness of the inside of the main body case 1 can be ensured more reliably.

[0040] Furthermore, when the main body case 1 is a metal case made of a metal material as in this embodiment, the metallic cylindrical portion can be configured as a hole portion 12 formed in the main body case 1. This eliminates the need for additional components, allowing for a simple configuration.

[0041] In this embodiment, a dielectric member 5 is disposed between the antenna element 4 and the main body case 1. This prevents short circuits from occurring even when the antenna element 4 is placed on the metal body case 1. Furthermore, when the dielectric member 5 is arranged between the antenna element 4 and the main body case 1 in this manner, the dielectric member can also be used as a sealing means (second sealing means) for ensuring watertightness inside the main body case 1. In this case, there is no need to provide a separate sealing means, and the number of parts can be reduced.

[0042] In this embodiment, a resin nut 72 is used as the second adjustment member, and the back cover 3 serving as a lid member that closes the lower opening of the main case 1 is disposed so as to cover the nut 72. This prevents the resin nut 72 from being visible on the outside, making it possible to realize an electrical device (watch body 100) with excellent design. Furthermore, the back cover 3 may be fixed to the main case 1 with metal screws, in which case the back cover 3 can be firmly fixed and a watch body 100 with an excellent appearance can be achieved.

[0043] [Second embodiment] Next, a second embodiment of an electronic device, an antenna characteristic adjusting method, and an electronic device assembling method according to the present invention will be described with reference to Figures 6 to 9. Note that while the first embodiment exemplifies a case in which the characteristic adjusting unit adjusts the antenna characteristics by changing the length of a screw, which is a first adjusting member, this embodiment differs from the first embodiment in that the characteristic adjusting unit adjusts the antenna characteristics by changing the height of a nut, which is a second adjusting member. The following will particularly describe the differences from the first embodiment. 6 to 9, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0044] FIG. 6 is a cross-sectional view of the main part of a watch body, which is an electronic device according to this embodiment. 7 and 8 are enlarged cross-sectional views of the characteristic adjusting section and its periphery, which are enclosed by the dashed-dotted line frame VII in FIG. As shown in Figures 7 and 8, the characteristic adjustment section 8 provided in the watch body 200, which is the electronic device of this embodiment, includes a screw 81 as a first adjustment member, a nut 82 as a second adjustment member, and a hole portion 12 as a cylindrical portion.

[0045] In this embodiment, the length of the screw 81, which is the first adjustment member, is constant, and in the illustrated example, has a length that is approximately the same as the thickness of the main case 1 (the height of the main case 1, the height in the Z-axis direction in Figure 6). The end of the screw 81 that is inserted into the hole 12 (the lower end in Figures 7 and 8) is received in a nut 82 so that it does not come into contact with the main body case 1 (such as the hole 12 formed in the main body case 1) or the metal back cover 3.

[0046] Nut 82 is made of a dielectric material such as resin, as in the first embodiment, and is disposed between hole 12 as a cylindrical portion and screw 81 as a first adjustment member. By disposing nut 82 between hole 12 and screw 81, a cylindrical conductor of GND potential is disposed on the outer periphery of metal screw 81 and resin nut 82 surrounding it. In this embodiment, the nut 82 serving as the second adjustment member is a member whose height is adjusted to adjust the characteristics of the antenna, such as the frequency.

[0047] The other configurations are the same as those of the first embodiment, so the same members are given the same reference numerals and the description thereof will be omitted.

[0048] Next, we will explain how to adjust the antenna characteristics in this embodiment. Note that the assembly method for the timepiece body 200 (electronic device) other than adjusting the antenna characteristics is the same as in the first embodiment, so explanation will be omitted.

[0049] As in the first embodiment, the antenna characteristics (frequency in this embodiment) are verified, and if the antenna is in a state of resonance with radio waves of a desired frequency, the adjustment of the antenna characteristics is terminated. On the other hand, if the verification results show that the antenna is not in a state of resonance with the radio wave of the desired frequency, the antenna characteristics are further adjusted. Specifically, the adjustment is performed as follows.

[0050] FIG. 9 is a graph showing the tendency of the results of a simulation of the relationship between the height of the nut and the frequency (gain peak frequency) of the antenna. When the length of the screw 81 is constant as in this embodiment (Figures 7 and 8 show the case where the screw 82 is provided over almost the entire height of the main body case 1), as shown in Figure 9, it can be seen that the antenna frequency [GHz] tends to decrease as the height (length) [mm] of the nut 82 increases. That is, in this embodiment, the screw 81 is a metal member that contacts the antenna element 4, but as the height (length) [mm] of the nut 82 increases, the overlap between the resin nut 82 and the metal screw 81 increases in the hole 12, which serves as a tubular portion that is a conductive portion with the same potential as the GND. This increases the electrostatic capacitance formed between the GND and the antenna element 4 (i.e., the capacitance of the capacitor formed between the antenna element 4 and the GND). This tends to lower the antenna frequency.

[0051] Therefore, if verification of the antenna characteristics reveals that the current antenna frequency is higher than the desired frequency, the height of nut 82, which is the second adjustment member, is increased as shown in Figure 8. This increases the capacitance between antenna element 4 and GND (back cover 3), lowering the antenna frequency. Conversely, if the current antenna frequency is lower than the desired frequency, the height of the second adjustment member, nut 82, is lowered. This reduces the capacitance between the antenna element 4 and GND (back cover 3), and increases the antenna frequency. In this manner, the height of the nut 82 is adjusted until the antenna frequency reaches the desired level.

[0052] As in the first embodiment, when a plurality of characteristic adjustment sections 8 are provided, adjustment may be performed by all of them or by any one of them. When adjustment is performed by a plurality of characteristic adjustment sections 8, the adjustment amount may be uniform, or the adjustment amount may vary depending on the characteristic adjustment section 8. Other points are the same as those in the first embodiment, and therefore the description thereof will be omitted.

[0053] In such a configuration, by finely adjusting the height of the nut 82, the antenna characteristics (frequency, etc.) can be adjusted to a desired level.

[0054] As described above, according to this embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.

[0055] That is, in this embodiment, the degree of overlap (the extent of the overlapping range) between the screw 81 as the first adjustment member and the nut 82 as the second adjustment member within the cylindrical hole portion 12 is adjusted by changing the height (length) of the nut 82 as the second adjustment member formed from resin. The resin nut 82 can be manufactured relatively easily, and it is possible to easily adjust the antenna characteristics, such as the antenna frequency, according to the design of the electronic device (watch body 200) into which the antenna is incorporated, without increasing the effort or cost. In this case, the metal screws 81 can be of the same shape and size, which is advantageous for mass production.

[0056] [Third embodiment] Next, a third embodiment of the electronic device, antenna characteristic adjustment method, and electronic device assembly method according to the present invention will be described with reference to Figures 10 and 11. The third embodiment is similar to the first embodiment in that the characteristic adjustment unit adjusts the antenna characteristics by changing the length of the screw, which is the first adjustment member. However, while the first embodiment illustrates a case in which the main body case 1 is made of a metal material, this embodiment differs from the first embodiment in that the main body case 1 is made of a resin material or the like. The following will particularly describe the differences from the first embodiment. 10 and 11, the same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0057] 10 and 11 are enlarged cross-sectional views of the periphery of the characteristic adjustment unit in this embodiment. In this embodiment, the main body case 1 is made of a hard resin such as ABS resin. The material for forming the main body case 1 is not limited to resin, and various materials such as ceramic can be used. Also, various composite materials in which carbon filler, glass fiber, etc. are mixed with various resins may be used. Forming the main body case 1 from such composite materials can improve the strength of the main body case 1.

[0058] An antenna element 4 is disposed on the main body case 1. When the main body case 1 is made of resin as in this embodiment, even if the antenna element 4 is placed directly on the main body case 1, no short circuit or the like occurs. 10 and 11, in this embodiment, there is no need to place an insulating member such as the dielectric member 5 between the antenna element 4 and the main body case 1. Note that a resin member or the like may be placed between the antenna element 4 and the main body case 1 to more reliably ensure watertightness inside the main body case 1. On the rear surface side of the antenna element 4, a screw 91A as a first adjustment member is provided so as to come into contact with the antenna element 4, as in the first embodiment and the like. In this embodiment, the screw 91A as the first adjustment member is a member whose length is adjusted to adjust the characteristics of the antenna, such as the frequency.

[0059] The electronic device (watch body) of this embodiment is equipped with a plurality of characteristic adjustment units 9A, similar to the first embodiment and the like. The characteristic adjustment section 9A in this embodiment has a screw 91A as a first adjustment member, a nut 92A as a second adjustment member, and a cylindrical member 13 as a cylindrical section.

[0060] In the main body case 1, a hole 12 is formed in the peripheral wall portion corresponding to the position where the screw 91A, which is the first adjustment member that constitutes these characteristic adjustment sections 9A, is provided, penetrating in the thickness direction (height direction, up and down direction in Figures 10 and 11) of the main body case 1. A cylindrical member 13 is disposed within the hole 12 .

[0061] 10 and 11, the bottom end of the cylindrical member 13 is in contact with the back cover 3. In this embodiment, the back cover 3 is made of a conductor such as metal and functions as a GND, and the cylindrical member 13 that comes into contact with it is a conductor with the same potential as GND. By placing the cylindrical member 13 on the outer periphery of the metal screw 91A and the resin nut 92A that surrounds it, a cylindrical conductor at GND potential is placed around the screw 91A and the nut 92A. The cylindrical member 13 only needs to have its lower end in contact with the back cover 3 and its upper end spaced a certain distance from the antenna element 4 (enough to avoid capacitive coupling), and the height to which the cylindrical member 13 is provided within the hole 12 can be set appropriately.

[0062] A nut 92A serving as a second adjustment member is disposed inside the cylindrical member 13. In this embodiment, the height (length) of the nut 92A is constant, and in the illustrated example, for example, the nut 92A has a height approximately equal to that of the cylindrical member 13.

[0063] The other configurations are the same as those of the first embodiment, so the same members are given the same reference numerals and the description thereof will be omitted.

[0064] Next, a method for adjusting the antenna characteristics in this embodiment will be described. Note that the method for assembling the watch body (electronic device) other than adjusting the antenna characteristics is almost the same as in the first embodiment, so a description thereof will be omitted.

[0065] As in the first embodiment, the antenna characteristics (frequency in this embodiment) are verified, and if the antenna is in a state of resonance with radio waves of a desired frequency, the adjustment of the antenna characteristics is terminated. On the other hand, if the verification results show that the antenna is not in a state of resonance with the radio wave of the desired frequency, the antenna characteristics are further adjusted. Specifically, the adjustment is performed as follows.

[0066] When the height (length) of the nut 92A is constant as in this embodiment (Figures 10 and 11 show a case where the nut 92A is provided over almost the entire height of the tubular member 13), the antenna frequency [GHz] tends to decrease as the length [mm] of the screw 91A increases. That is, in this embodiment, screw 91A is a metal member that contacts antenna element 4, but as the length [mm] of screw 91A increases, the overlap between resin nut 92A and metal screw 91A increases within cylindrical member 13, which serves as a conductor having the same potential as GND. This increases the electrostatic capacitance formed between GND and antenna element 4 (i.e., the capacitance of the capacitor formed between antenna element 4 and GND). This tends to lower the antenna frequency.

[0067] Therefore, if verification reveals that the current antenna frequency is higher than the desired frequency, the length of the screw 91A, which is the first adjustment member, is increased as shown in Figure 11. This increases the capacitance between the antenna element 4 and GND (back cover 3), lowering the antenna frequency. Conversely, if the current antenna frequency is lower than the desired frequency, the length of the first adjustment member, screw 91A, is shortened, thereby reducing the capacitance between antenna element 4 and GND (back cover 3) and increasing the antenna frequency. In this manner, the length of the screw 91A is adjusted until the antenna frequency reaches a desired level.

[0068] As in the first embodiment, if a plurality of characteristic adjustment sections 9A are provided, adjustment may be performed by all of them or by any one of them. When adjustment is performed by a plurality of characteristic adjustment sections 9A, the adjustment amount may be uniform, or the adjustment amount may be varied depending on the characteristic adjustment section 9A. Other points are the same as those in the first embodiment, and therefore the description thereof will be omitted.

[0069] In such a configuration, the antenna characteristics (frequency, etc.) can be adjusted to a desired level by finely adjusting the length of the screw 91A.

[0070] As described above, according to this embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.

[0071] That is, in this embodiment, when the main body case 1 is formed of resin, a metallic tubular member 13 is provided as a tubular portion within the main body case, and a screw 91A, which is a first metallic adjustment member arranged in contact with or close to the annular antenna element 4 arranged on the upper side of the main body case 1, is arranged so that its other end is inserted into the tubular member 13, and a nut 92A, which is a second adjustment member made of a dielectric, is arranged so as to be interposed between the tubular member 13 and the screw 91A.By changing the length of the screw 91A inserted into the tubular member 13, the degree of overlap (the extent of the overlapping range) between the screw 91A and the nut 92A within the tubular member 13 can be adjusted, thereby adjusting the antenna characteristics such as frequency. This means that even in the case of an electronic device (watch body) with a resin case, an antenna with the desired characteristics (frequency, etc.) can be easily obtained by simply changing the length of the first adjustment member, screw 91A, without changing other configurations, designs, etc.

[0072] [Fourth embodiment] Next, a fourth embodiment of the electronic device, the antenna characteristic adjusting method, and the electronic device assembling method according to the present invention will be described with reference to Figures 12 and 13. The fourth embodiment is similar to the second embodiment in that the characteristic adjusting unit adjusts the antenna characteristics by changing the height of a nut, which is the second adjusting member. However, while the second embodiment illustrates a case in which the main body case 1 is made of a metal material, this embodiment differs from the second embodiment in that the main body case 1 is made of a resin material or the like, as in the third embodiment. The following will particularly describe the differences from the second and third embodiments. 12 and 13, the same members as those in the second and third embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0073] 12 and 13 are enlarged cross-sectional views of the periphery of the characteristic adjustment section in this embodiment. The electronic device (watch body) of this embodiment comprises a body case 1, an antenna element 4, a plurality of characteristic adjustment units 9B, and the like, as in the first embodiment and the like. The main body case 1 is a resin case made of various resins, similar to the third embodiment. Furthermore, similar to the third embodiment, characteristic adjustment unit 9B has a screw 91B as a first adjustment member, a nut 92B as a second adjustment member, and a cylindrical member 13 as a cylindrical portion. Cylindrical member 13 is in contact with back cover 3, which functions as GND, and is a conductive portion at the same potential as GND.

[0074] As shown in FIGS. 12 and 13, in this embodiment, the length of the screw 91B, which is the first adjustment member, is constant, and in the illustrated example, has a length that is approximately the same as the thickness of the main case 1 (the height of the main case 1). The end of the screw 91B that is inserted into the tubular member 13 (the lower end in Figures 12 and 13) is received in a nut 92B so that it does not come into contact with the tubular member 13 provided inside the hole 12 of the main body case 1 or the metal back cover 3.

[0075] Nut 92B is made of a dielectric material such as resin, as in the second and third embodiments, and is disposed between cylindrical member 13 as a cylindrical portion and screw 91B as a first adjustment member. By disposing cylindrical member 13 on the outer periphery of metal screw 91B and resin nut 92B surrounding it, a cylindrical conductor of GND potential is disposed around screw 91B and nut 92B. In this embodiment, the nut 92B serving as the second adjustment member is a member whose height is adjusted to adjust the characteristics of the antenna, such as the frequency.

[0076] The other configurations are the same as those of the second and third embodiments, so the same members are given the same reference numerals and the description thereof will be omitted.

[0077] Next, a method for adjusting the antenna characteristics in this embodiment will be described. Note that the method for assembling the watch body (electronic device) other than adjusting the antenna characteristics is almost the same as in the second and third embodiments, and therefore a description thereof will be omitted.

[0078] As in the second and third embodiments, the antenna characteristics (frequency in this embodiment) are verified, and if the antenna is in a resonant state with radio waves of the desired frequency, the adjustment of the antenna characteristics is terminated. On the other hand, if the verification results show that the antenna is not in a state of resonance with the radio wave of the desired frequency, the antenna characteristics are further adjusted. Specifically, the adjustment is performed as follows.

[0079] When the length of the screw 91B is constant as in this embodiment (Figures 12 and 13 show the case where the screw 91B is provided over almost the entire height of the main body case 1), the antenna frequency [GHz] tends to decrease as the height (length) [mm] of the nut 92B increases. That is, in this embodiment, screw 91B is a metal member that contacts antenna element 4, but as the height (length) [mm] of nut 92B increases, the overlap between resin nut 92B and metal screw 91B increases within cylindrical member 13, which serves as a conductor having the same potential as GND. This increases the electrostatic capacitance formed between GND and antenna element 4 (i.e., the capacitance of the capacitor formed between antenna element 4 and GND). This tends to lower the antenna frequency.

[0080] Therefore, if verification of the antenna characteristics reveals that the current antenna frequency is higher than the desired frequency, the height of nut 92B, which is the second adjustment member, is increased as shown in Figure 13. This increases the capacitance between the antenna element 4 and GND (back cover 3), lowering the antenna frequency. Conversely, if the current antenna frequency is lower than the desired frequency, the height of the nut 92B, which is the second adjustment member, is lowered, thereby reducing the capacitance between the antenna element 4 and GND (back cover 3) and increasing the antenna frequency. In this manner, the height of the nut 92B is adjusted until the antenna frequency reaches the desired level.

[0081] As in the second and third embodiments, if a plurality of characteristic adjustment sections 9B are provided, adjustment may be performed by all of them or by any one of them. When adjustment is performed by a plurality of characteristic adjustment sections 9B, the adjustment amount may be uniform, or the adjustment amount may be varied depending on the characteristic adjustment section 9B. The other points are the same as those in the second and third embodiments, and therefore the description thereof will be omitted.

[0082] In this configuration, the antenna characteristics (frequency, etc.) can be adjusted to a desired level by finely adjusting the height of the nut 92B.

[0083] As described above, according to this embodiment, when the main body case 1 is formed of resin, a metal tubular member 13 is provided as a tubular portion within the main body case, and a metal first adjustment member, a screw 91B, which is arranged in contact with or close to the annular antenna element 4 arranged on the upper side of the main body case 1, is arranged so that its other end is inserted into the tubular member 13, and a second adjustment member, a nut 92B made of a dielectric, is arranged so as to be interposed between the tubular member 13 and the screw 91B.By changing the height of the nut 92B arranged within the tubular member 13, the degree of overlap (the extent of the overlapping range) between the screw 91B and the nut 92B within the tubular member 13 can be adjusted, thereby adjusting the antenna characteristics such as frequency. This means that even in the case of an electronic device (watch body) with a resin case, an antenna with the desired characteristics (frequency, etc.) can be easily obtained by simply changing the height of the nut 92B, which is the second adjustment member, without having to change other configurations, designs, etc. The nut 92B is a member made of resin, and the height can be changed and adjusted relatively easily.

[0084] Although the embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to these embodiments and that various modifications are possible without departing from the spirit of the present invention.

[0085] For example, in each of the above embodiments, the screw as the first adjustment member is a set screw having a male thread formed on the entire circumferential surface thereof, but the configuration of the screw is not limited to this. For example, a configuration may be adopted in which a male thread is provided only on the portion of the screw that comes into contact with the antenna element 4 (the portion that is inserted into the recess 41), and a male thread is not provided on the portion that is inserted into the cylindrical portion. In this case, the second resin adjustment member does not have to be a nut with an internal thread, and may be a simple cylindrical member made of resin, etc.

[0086] In such cases, if the screw and nut do not thread together, the antenna element 4 cannot be fixed to the main body case using the screw as the first adjustment member and the nut as the second adjustment member. Therefore, in this case, the antenna element 4 is fixed to the main body case by a fixing means such as press fitting. Even when the screw as the first adjustment member is not fixed to the antenna element 4 (for example, when one end of the screw is simply in contact with the antenna element 4 or when it is placed close to the antenna element 4 and capacitively coupled), the antenna element 4 is similarly fixed to the main body case by press-fitting or the like.

[0087] Furthermore, in each of the above embodiments, the case where the screw serving as the first adjustment member is a set screw has been exemplified, but the first adjustment member is not limited to a set screw. For example, as shown in Figures 14 and 15, a through hole 42 that penetrates the antenna element 4 in the thickness direction may be provided, and headed screws 91C, 91D such as flat head screws or pan head screws having a screw head 911 with an outer diameter larger than the inner diameter of the through hole 42 may be used as the first adjustment members of the characteristic adjustment sections 9C, 9D.

[0088] In addition, when a male thread is not formed around the axis of the first adjustment member, such as headed screws 91C and 91D shown in Figures 14 and 15, the second adjustment member that receives it does not have to be a nut. That is, for example, as shown in Figures 14 and 15, the second adjustment member may be an adhesive 92C, 92D or the like that is filled inside the cylindrical portion so as to be interposed between the first adjustment member, i.e., a headed screw 91C, 91D (or a screw as exemplified in the first to fourth embodiments), and the cylindrical portion and functions as a dielectric. In this case, there is no need to pre-form the second adjustment member into a predetermined shape such as a nut, so that it is possible to more flexibly accommodate design changes and the like.

[0089] Even when the second adjustment member is adhesive 92C, 92D, etc., as in the first and third embodiments, the amount of adhesive 92C, 92D filled can be kept constant (for example, in Figure 14, the amount is the same height as the thickness direction of the main body case 1), and the length of the first adjustment member (headed screws 91C, 91D or screws) inserted therein can be changed to adjust the amount of overlap between the first adjustment member and the second adjustment member, thereby adjusting the antenna characteristics.

[0090] Similarly, when the second adjustment member is adhesive 92C, 92D, etc., as in the second and fourth embodiments, the length of the first adjustment member (headed screws 91C, 91D or screws) inserted into the adhesive 92C, 92D can be kept constant (for example, in Figure 15, the length is the same as the height in the thickness direction of the main body case 1), and the height of the second adjustment member can be changed by changing the filling amount of the second adjustment member, adhesive 92C, 92D, and the amount of overlap between the first adjustment member and the second adjustment member can be adjusted to adjust the antenna characteristics.

[0091] Furthermore, for example, when the main body case 1 is made of resin and a ring-shaped antenna element 4 is arranged on the upper side of the main body case 1, the characteristic adjustment unit 9E may be configured to include a third adjustment member (e.g., a screw 91E having a screw head 911) made of a metal material, one end of which is arranged in contact with or close to the antenna element 4 and the other end of which is arranged inside the main body case 1, and a fourth adjustment member (e.g., a screw 92E having a screw head 921) made of a metal material, one end of which is inserted into the main body case 1 from the other end of the screw 91E and is arranged at a predetermined distance from the other end of the screw 91E.

[0092] 16, for example, a through hole 42 is formed in antenna element 4, a first hole 14 that does not penetrate downward is provided in main body case 1 at a position corresponding to through hole 42 in antenna element 4, a through hole 31 is also formed in back cover 3 at a position roughly corresponding to through hole 42 in antenna element 4, and a second hole 15 that does not penetrate upward is provided in main body case 1 at a position corresponding to through hole 31. In this case, the fourth adjustment member (for example, screw 92E having screw head 921) comes into contact with back cover 3, and therefore becomes a conductor with the same potential as GND if back cover 3 functions as GND. The gap G between the screw 91E inserted from above through the through hole 42 and the screw 92E inserted from below through the through hole 31 can be adjusted to adjust the distance between the third adjustment member (screw 91E) and the fourth adjustment member (screw 92E), thereby adjusting the antenna characteristics.

[0093] In this configuration, the screw 91E as the third adjustment member and the screw 92E as the fourth adjustment member can be made to have the same shape, which makes it possible to adjust the antenna characteristics while improving productivity. Furthermore, the antenna element 4 and back cover 3 can be fixed to the main body case 1 from above and below with screws 91E and 92E for adjusting the antenna characteristics. This allows the antenna element 4 and back cover 3 to be fixed and the antenna characteristics to be adjusted without increasing the number of parts.

[0094] Furthermore, in each of the above embodiments, the nut 72, which is the second adjustment member, is a single piece, but the shape of the nut is not limited to this. The nut serving as the second adjustment member may have, for example, a double nut structure. In this case, the nut is less likely to come off and the screw serving as the first adjustment member can be firmly fastened. When the nut serving as the second adjustment member is a double nut divided into a plurality of pieces, the nuts may be arranged with a gap between them in the vertical direction. If the nut serving as the second adjustment member is divided into a plurality of pieces, it is expected that the antenna characteristics can be adjusted more precisely by finely adjusting each nut.

[0095] In addition, the above first and third embodiments exemplify cases in which the degree of overlap (width of overlapping range) between the first adjustment member and the second adjustment member (nut) within the tubular portion is adjusted by changing the length of the first adjustment member (screw) inserted into the tubular portion, and the second and fourth embodiments exemplify cases in which the degree of overlap (width of overlapping range) between the first adjustment member and the second adjustment member (nut) within the tubular portion is adjusted by changing the height of the second adjustment member (nut), but the method of adjusting the antenna characteristics is not limited to this. For example, the degree of overlap (extent of overlap) between the first adjustment member (screw) and the second adjustment member (nut) within the cylindrical portion can be adjusted by changing both the length of the first adjustment member (screw) and the height of the second adjustment member (nut) inserted into the cylindrical portion, thereby adjusting the antenna characteristics. In this case, the first adjustment member (screw) and the second adjustment member (nut) can be adjusted separately, allowing for more flexible adjustment depending on the shape of the electronic device in which the antenna is mounted, etc.

[0096] Furthermore, in each of the above embodiments, the case where the back cover 3 functions as GND and the cylindrical portion comes into contact with the back cover 3 to have the same potential as GND has been exemplified, but the functioning of GND is not limited to the back cover 3. For example, if the back cover 3 is made of resin or the like and a substrate or the like placed on the back cover 3 functions as GND, the cylindrical portion is configured to be in contact with the substrate or other member that functions as GND so that it has the same potential as GND.

[0097] Furthermore, in each of the above embodiments, an example was given in which the characteristic adjustment unit was embedded in the peripheral wall of the main body case, but the characteristic adjustment unit may be provided within the main body case, and is not limited to a configuration in which it is embedded in the peripheral wall of the main body case as shown. For example, the characteristic adjustment portion may be provided so as to protrude inward from the peripheral wall of the main body case.

[0098] Furthermore, in each of the above embodiments, the electronic device is described as a watch body 100, but the electronic device can be widely applied to any device equipped with an antenna, and is not limited to watches (wristwatches, etc.). For example, the electronic device of the present invention may be applied to various devices such as a pedometer, an altimeter, a barometer, etc. Furthermore, the electronic device of the present invention may be applied to various terminal devices such as a smartphone.

[0099] Although several embodiments of the present invention have been described above, the scope of the present invention is not limited to the above-described embodiments, but includes the scope of the invention described in the claims and its equivalents. The inventions described in the claims originally attached to this application are as follows. The claim numbers described in the appendix are the same as those of the claims originally attached to this application. [Note] <Claim 1> The main body case and an antenna element disposed in the main body case; a first adjustment member formed of a metal material, one end of which is disposed in contact with or in proximity to the antenna element and the other end of which is disposed within the main body case; a cylindrical portion included in the main body case and made of a metal material, into which the other end of the first adjustment member is inserted; a second adjustment member formed of a dielectric material and disposed within the cylindrical portion and interposed between the cylindrical portion and the first adjustment member; An electronic device comprising: <Claim 2> 2. The electronic device according to claim 1, wherein the antenna element is disposed on an upper side of the main body case. <Claim 3> 3. The electronic device according to claim 1, wherein the cylindrical portion has the same potential as GND. <Claim 4> 2. The electronic device according to claim 1, wherein the width of an overlapping range in which the first adjustment member and the second adjustment member overlap within the cylindrical portion is adjustable. <Claim 5> 5. The electronic device according to claim 1, wherein the first adjustment member is a metal screw. <Claim 6> 5. The electronic device according to claim 1, wherein the second adjustment member is a nut made of resin and having a shape corresponding to that of the first adjustment member. <Claim 7> 7. The electronic device according to claim 6, wherein the nut has a double nut structure. <Claim 8> 6. The electronic device according to claim 1, wherein the second adjustment member is an adhesive that fills the inside of the cylindrical portion and functions as a dielectric. <Claim 9> 9. The electronic device according to claim 1, wherein the first adjustment member is entirely disposed on the non-visual side of the antenna element. <Claim 10> 10. The electronic device according to claim 1, further comprising a first sealing means for making the inside of the main body case watertight. <Claim 11> 11. The electronic device according to claim 10, wherein the first sealing means is a gasket or an O-ring provided between the cylindrical portion or the second adjustment member and the first adjustment member. <Claim 12> The main body case is made of a metal material, 12. The electronic device according to claim 1, wherein the cylindrical portion is configured as a hole formed in the main body case. <Claim 13> 13. The electronic device according to claim 12, further comprising a dielectric member disposed between the antenna element and the main body case. <Claim 14> 14. The electronic device according to claim 13, wherein the dielectric member functions as a second sealing means for making the inside of the main body case watertight. <Claim 15> The main body case is made of resin, 12. The electronic device according to claim 1, wherein the cylindrical portion is formed of a metallic cylindrical member provided inside the main body case. <Claim 16> a main body case formed of resin; an annular antenna element disposed in the main body case; a third adjustment member formed of a metal material, one end of which is disposed in contact with or in proximity to the antenna element and the other end of which is disposed within the main body case; a fourth adjustment member formed of a metal material, one end of which is inserted into the main body case from the other end of the third adjustment member, and which is disposed at a predetermined distance from the other end of the third adjustment member; An electronic device comprising: <Claim 17> When a first metal adjustment member is arranged in contact with or close to an antenna element arranged in a main body case, and the other end side is arranged to be inserted into a cylindrical portion formed of a metal material and provided in the main body case, and a second dielectric adjustment member is arranged to be interposed between the cylindrical portion and the first adjustment member, A method for adjusting antenna characteristics, characterized by adjusting the overlapping range of the first adjustment member and the second adjustment member within the cylindrical portion by changing the length of the first adjustment member inserted into the cylindrical portion. <Claim 18> When a first metal adjustment member is arranged in contact with or close to an antenna element arranged in a main body case, and the other end side is arranged to be inserted into a cylindrical portion formed of a metal material and provided in the main body case, and a second dielectric adjustment member is arranged to be interposed between the cylindrical portion and the first adjustment member, A method for adjusting antenna characteristics, characterized in that the overlapping range of the first adjustment member and the second adjustment member within the cylindrical portion is adjusted by changing the height of the second adjustment member. <Claim 19> When a first metal adjustment member is arranged in contact with or close to an antenna element arranged in a main body case, and the other end side is arranged to be inserted into a cylindrical portion formed of a metal material and provided in the main body case, and a second dielectric adjustment member is arranged to be interposed between the cylindrical portion and the first adjustment member, A method for adjusting antenna characteristics, characterized in that the overlapping range of the first adjustment member and the second adjustment member within the cylindrical portion is adjusted by changing the length of the first adjustment member and the height of the second adjustment member inserted into the cylindrical portion. <Claim 20> The antenna element is placed in the main body case, a first adjustment member made of a metal material is arranged so that one end side thereof is in contact with or in close proximity to the antenna element and the other end side thereof is inserted into a metal cylindrical portion provided in the main body case; A method for assembling an electronic device, characterized in that a second adjustment member made of a dielectric is placed inside the cylindrical portion so as to be interposed between the cylindrical portion and the first adjustment member. <Claim 21> the first adjustment member is a metal screw, The second adjustment member is a nut made of resin, the main body case has an opening on the bottom side and a lid member that closes the opening, 21. The method for assembling an electronic device according to claim 20, wherein the cover member is disposed so as to cover the nut, and then fixed to the main body case with a metal screw. [Explanation of symbols]

[0100] 1 Main unit case 2 Windshield material 3 Back cover 4 antenna elements 5 Dielectric material 6 PCB 7 Characteristic adjustment section 12 Hole portion (cylindrical portion) 71 Screw (first adjustment member) 72 Nut (second adjustment member) 100 Watch body

Claims

1. A main body case formed of resin, an annular antenna element disposed on one surface of the main body case; a third adjustment member formed of a metal material, one end of which is disposed within the antenna element and the other end of which is disposed within the main body case; a conductive portion disposed on the other surface side of the main body case; a fourth adjustment member made of a metal material, one end of which is disposed within the conductor portion and the other end of which is disposed within the main body case; and The electronic device according to claim 1, wherein the third adjustment member and the fourth adjustment member are arranged at a predetermined distance from each other.

2. The third adjustment member is a screw having a screw head protruding from the annular antenna element, 2. The electronic device according to claim 1, wherein the fourth adjustment member is a screw having a screw head protruding from the conductor portion.

3. The electronic device described in Claim 1, characterized in that one end of the third adjustment member is positioned within a first through hole formed in the antenna element 4, and the other end is positioned within a first hole portion formed in the main body case, and the first hole portion is a non-through hole portion and is provided at a position corresponding to the first through hole.

4. One end of the fourth adjustment member is arranged in a second through-hole formed in the antenna element 4, and the other end is arranged in a second hole formed in the main body case 1, The electronic device according to claim 1 , wherein the second hole is a hole that does not penetrate through the electronic device and is provided at a position corresponding to the second through-hole.

5. The conductive portion is a back cover, 2. The electronic device according to claim 1, wherein the fourth adjustment member is in contact with the back cover, and the back cover functions as a GND.

Images