Electronic device, antenna characteristic adjustment method, and electronic device assembling method

Abstract

The present invention provides an electronic device having an antenna that can easily cope with design changes, a method for adjusting antenna characteristics, and an assembly method of the electronic device. The electronic device includes a watch body (100) having: a main body case (1); an antenna element (4) disposed in the main body case (1); a screw (71) as a first adjustment component, which is formed of a metal material, one end of which is disposed in contact with or close to the antenna element (4), and the other end of which is disposed in the main body case (1); a hole (12) as a cylindrical portion, which is provided in the main body case (1) and is formed of a metal material, and the other end of the screw (71) is inserted; and a nut (72) as a second adjustment component, which is formed of a dielectric, disposed in the hole (12) and between the hole (12) and the screw (71).

Description

[0001] This application is based on Japanese patent application and claims priority under 35 USC 119, the entire disclosure of which including specification, claims, drawings and abstract is incorporated herein by reference in its entirety. Technical Field

[0002] The present invention relates to an electronic device, an antenna characteristic adjustment method and an electronic device assembling method. Background Art

[0003] Currently, among electronic devices such as watches, there are known electronic devices that can receive satellite radio waves in order to obtain accurate time information, position information, and the like.

[0004] For example, Japanese Patent Application Publication No. 2013-183437 describes the following structure: a ring-shaped antenna (referred to as a "loop antenna" in Japanese Patent Application Publication No. 2013-183437) is arranged on the upper part of a main body shell (referred to as a "box exterior" in Japanese Patent Application Publication No. 2013-183437), and the bottom surface of the main body shell functions as a ground plane.

[0005] The characteristics (frequency, gain) of an antenna are affected by the components arranged around it, the materials of the components, etc. Therefore, in order to obtain the desired characteristics such as frequency, it is necessary to adjust the antenna's arrangement position, structure, shape of the surrounding components, etc. to calibrate the frequency. Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, for example, after the arrangement position and structure of the antenna, the shape of peripheral members, etc. are once determined, the design of the electronic device may be changed.

[0008] In such a case, it is necessary to readjust the characteristics of the antenna, such as the frequency, and to redesign the antenna in some cases, which leads to a problem of increased labor, time, and cost.

[0009] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electronic device having an antenna that can easily cope with design changes, a method for adjusting antenna characteristics, and a method for assembling the electronic device.

[0010] The present invention provides an electronic device, characterized in that:

[0011] The invention comprises: a main body shell; an antenna element, which is arranged in the above-mentioned main body shell; a first adjustment component, which is formed of a metal material, one end side of which is arranged in contact with or close to the above-mentioned antenna element, and the other end side is arranged in the above-mentioned main body shell; a cylindrical portion, which is possessed by the above-mentioned main body shell and formed of a metal material, for the other end side of the above-mentioned first adjustment component to be inserted; and a second adjustment component, which is formed of a dielectric, arranged in the above-mentioned cylindrical portion and between the above-mentioned cylindrical portion and the above-mentioned first adjustment component.

[0012] The present invention provides an electronic device, characterized in that:

[0013] The invention comprises: a main body shell formed of resin; a ring-shaped antenna element arranged in the main body shell; a third adjustment component formed of a metal material, one end of which is arranged in contact with or close to the antenna element, and the other end of which is arranged in the main body shell; and a fourth adjustment component formed of a metal material, one end of which is inserted into the main body shell from the other end of the third adjustment component, and is arranged to be separated by a predetermined distance from the other end of the third adjustment component.

[0014] The present invention provides a method for adjusting antenna characteristics, characterized in that:

[0015] When a first metal adjustment component that is arranged in contact with or close to an antenna element arranged in a main body shell is arranged so that its other end is laterally inserted into a cylindrical portion formed of a metal material and provided in the above-mentioned main body shell, and a second adjustment component formed of a dielectric is arranged in a manner interposed between the above-mentioned cylindrical portion and the above-mentioned first adjustment component, the overlapping range of the above-mentioned first adjustment component and the above-mentioned second adjustment component in the above-mentioned cylindrical portion is adjusted by changing the length of the above-mentioned first adjustment component inserted into the above-mentioned cylindrical portion.

[0016] The present invention provides a method for adjusting antenna characteristics, characterized in that:

[0017] When a first metal adjustment component that is arranged in contact with or close to an antenna element arranged in a main body shell is arranged so that its other end is laterally inserted into a cylindrical portion formed of a metal material and provided in the above-mentioned main body shell, and a second adjustment component formed of a dielectric is arranged in a manner interposed between the above-mentioned cylindrical portion and the above-mentioned first adjustment component, the overlapping range of the above-mentioned first adjustment component and the above-mentioned second adjustment component in the above-mentioned cylindrical portion is adjusted by changing the height of the above-mentioned second adjustment component.

[0018] The present invention provides a method for adjusting antenna characteristics, characterized in that:

[0019] When a first metal adjustment component that is arranged in contact with or close to an antenna element arranged in a main body shell is arranged so that its other end is laterally inserted into a cylindrical portion formed of a metal material and provided in the above-mentioned main body shell, and a second adjustment component formed of a dielectric is arranged in a manner interposed between the above-mentioned cylindrical portion and the above-mentioned first adjustment component, the overlapping range of the above-mentioned first adjustment component and the above-mentioned second adjustment component in the above-mentioned cylindrical portion is adjusted by changing the length of the above-mentioned first adjustment component inserted into the above-mentioned cylindrical portion and the height of the above-mentioned second adjustment component.

[0020] The present invention provides an assembly method of an electronic device, characterized in that:

[0021] An antenna element is arranged in the main body shell, and a first adjustment component formed of a metal material is arranged so that one end side is in contact with or close to the above-mentioned antenna element and the other end side is inserted into a metal cylindrical portion provided in the above-mentioned main body shell, and a second adjustment component formed of a dielectric is arranged in the above-mentioned cylindrical portion in a manner interposed between the above-mentioned cylindrical portion and the above-mentioned first adjustment component.

[0022] The effects of the invention are as follows.

[0023] According to the present invention, it is possible to provide an electronic device having an antenna that can easily cope with design changes, a method for adjusting antenna characteristics, and a method for assembling an electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a perspective view showing a main part of a timepiece body as the electronic device according to the first embodiment.

[0025] Figure 2 yes Figure 1 A sectional view of the watch body taken along line II-II is shown.

[0026] Figure 3 yes Figure 2 An enlarged cross-sectional view of the periphery of the characteristic adjustment portion indicated by the dot-dash line frame III.

[0027] Figure 4 yes Figure 2 The enlarged cross-sectional view of the characteristic adjustment portion and the vicinity thereof shown in the dotted line frame III is shown. Figure 3 This is a diagram showing a state where the length of the screw is longer than that of the screw.

[0028] Figure 5 This is a graph showing the trend of the result of simulation on the relationship between the length of the screw and the frequency of the antenna.

[0029] Figure 6 It is a cross-sectional view of a main part of a timepiece body as an electronic device in a second embodiment.

[0030] Figure 7 yes Figure 6 An enlarged cross-sectional view of the periphery of the characteristic adjustment portion indicated by the dot-dash line frame VII.

[0031] Figure 8 yes Figure 6 The enlarged cross-sectional view of the periphery of the characteristic adjustment portion shown in the dotted line frame VII is shown in FIG. Figure 7 This is a diagram showing a state where the height is higher than that of the nut.

[0032] Fig. 9 This is a graph showing the trend of the result of simulation on the relationship between the height of the nut and the frequency of the antenna.

[0033] Fig.10 It is an enlarged cross-sectional view of the periphery of a characteristic adjustment portion in the third embodiment.

[0034] Fig.11 is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion in the third embodiment, and is a view showing Fig.10 This is a diagram showing a state where the length of the screw is longer than that of the screw.

[0035] Fig.12 It is an enlarged cross-sectional view of the periphery of a characteristic adjustment portion in the fourth embodiment.

[0036] Fig.13 is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion in the fourth embodiment, and is a view showing Fig.12 This is a diagram showing a state where the height is higher than that of the nut.

[0037] Fig.14 This is an enlarged cross-sectional view of the periphery of a characteristic adjustment portion in a modified example of the first embodiment.

[0038] Fig.15 It is an enlarged cross-sectional view of the periphery of a characteristic adjustment portion in a modified example of the second embodiment.

[0039] Fig.16 It is an enlarged cross-sectional view showing the structure of a modified example of the characteristic adjustment portion. DETAILED DESCRIPTION

[0040] [First embodiment]

[0041] Reference Figures 1 to 5 The first embodiment of the electronic device, the method for adjusting antenna characteristics, and the method for assembling the electronic device of the present invention is described. In this embodiment, the electronic device is a watch body as an example.

[0042] In addition, various limitations which are technically preferable for carrying out the present invention are added to the embodiments described below, but the scope of the present invention is not limited to the following embodiments and the illustrated examples.

[0043] Figure 1 1 is a perspective view showing the main part of a clock body as an electronic device in this embodiment. Figure 2 yes Figure 1 A sectional view of the watch body taken along line II-II is shown.

[0044] like Figure 1 and Figure 2 As shown, the watch body 100 in this embodiment has a Figure 2 A hollow short columnar shell (hereinafter referred to as "main body shell 1" in the embodiment) with openings at the top and bottom (the surface and back of the watch) of the clock (in the Z-axis direction).

[0045] In the illustrated example, the main body case 1 is formed into a cylindrical shape that is substantially circular when viewed from above. In addition, the shape of the main body case 1 and the watch body 100 having the main body case 1 is not limited to the illustrated example. For example, it may be an elliptical shape when viewed from above, or it may be a polygonal column shape, etc.

[0046] In the present embodiment, the main body case 1 is formed of a metal material such as SUS, titanium, etc. In addition, the material forming the main body case 1 is not limited to the material exemplified here.

[0047] A light-transmitting windshield member 2 made of transparent glass or the like is provided at an opening 11 on the surface side (the viewing side of the timepiece, the upper side) of the main body case 1 so as to cover the opening 11 .

[0048] Furthermore, a back cover 3 as a cover member for closing the opening is attached to the back side of the main body case 1 (the side not for viewing or the lower side of the timepiece).

[0049] In the present embodiment, the back cover 3 is formed of a conductor such as various metal materials such as SUS and titanium, and functions as a GND (ground plane).

[0050] The material forming the back cover 3 is not limited to the material exemplified here. The back cover 3 may be formed of the same material as the main body casing 1 or may be formed of a different material.

[0051] An antenna element 4 constituting an antenna (eg, a patch antenna) is disposed in the body case 1. The antenna element 4 in this embodiment is a ring-shaped frame member disposed on the upper side of the body case 1 (the surface side of the body case 1, the viewing side of the watch).

[0052] In addition, the shape of the antenna element 4 is not limited to the example shown in the figure.

[0053] Here, the annular shape includes not only a circular shape when viewed from above, but also a shape that is oval, rectangular and connected in one. Moreover, the annular shape mentioned here is not limited to a completely closed annular shape, but also includes a shape such as a C-shape with a gap in part.

[0054] The material forming the antenna element 4 is not particularly limited, but when the conductivity of the forming material is low (when the resistivity is high), sufficient antenna gain may not be obtained.

[0055] Therefore, the material forming the antenna element 4 is preferably a metal material having a conductivity of at least a certain level (i.e., a resistivity of at least a certain level), such as SUS (stainless steel), titanium, etc. Also, since the watch body 100 as an electronic device is not recommended to be too heavy, the antenna element 4 is preferably formed of a material as light as possible.

[0056] A substrate 6 including a circuit unit (not shown) and the like is disposed on the back cover 3 .

[0057] A connector component 61 is connected to the antenna element 4 , and the antenna element 4 is connected to the circuit portion of the substrate 6 via the connector component 61 .

[0058] The connector component 61 is a contact mechanism for power supply, and the antenna element 4 is connected to, for example, an LC circuit or the like as a circuit portion mounted on the substrate 6 via the connector component 61 .

[0059] A dielectric member 5 made of a dielectric such as resin is disposed between the antenna element 4 and the main body case 1. The dielectric member 5 is formed in a substantially same annular shape as the annular antenna element 4 and is disposed so as to overlap the antenna element 4.

[0060] By interposing the dielectric member 5 as an insulating member between the antenna element 4 and the metal main body case 1 , it is possible to prevent the antenna element 4 from directly contacting the metal main body case 1 , thereby avoiding the occurrence of a short circuit.

[0061] The dielectric member 5 only needs to have a width sufficient to stably support the antenna element 4 without causing the antenna element 4 to come into contact with the main body housing 1 , and does not necessarily need to overlap with the antenna element 4 in the same shape.

[0062] The dielectric member 5 may be an O-ring or the like provided between the antenna element 4 and the main body casing 1 . In this case, the dielectric member 5 may also function as a sealing mechanism (second sealing mechanism) for making the inside of the main body casing 1 watertight.

[0063] A characteristic adjustment unit 7 for adjusting antenna characteristics is provided on the lower side (back side, non-observation side) of the antenna element 4 .

[0064] The characteristic adjustment portion 7 includes a first adjustment member, a cylindrical portion, and a second adjustment member.

[0065] like Figure 1 As shown, in this embodiment, four characteristic adjustment parts 7 are arranged at substantially equal intervals along the circumference of the main body case 1. The number of characteristic adjustment parts 7 is not limited to the example shown in the figure, and may be three or less, or five or more.

[0066] Figure 3 and Figure 4 yes Figure 2 An enlarged cross-sectional view of the periphery of the characteristic adjustment portion surrounded by a dashed line frame III in FIG.

[0067] like Figure 3 and Figure 4 As shown, a recess 41 is formed on the lower side (the back side, the side not on which observation is made) of the antenna element 4, corresponding to the position where the characteristic adjustment section 7 is provided. The inner peripheral surface of the recess 41 is processed with an internal thread.

[0068] A screw 71 (so-called headless screw or the like) having an external thread formed at least on one end thereof and threadably engaged with an internal thread formed on the inner peripheral surface of the recess 41 is screwed into each recess 41 .

[0069] In the present embodiment, the screw 71 is a first adjustment member formed of a metal material such as SUS, one end of which is in contact with the antenna element 4 and the other end of which is disposed in the main body housing 1 .

[0070] Furthermore, in terms of the appearance of the timepiece body 100 , it is preferred that the entire screw 71 as the first adjustment member is disposed on the non-observable side of the antenna element 4 .

[0071] Therefore, for example, in the present embodiment, the recess 41 formed on the back side of the antenna element 4 is of a depth that does not penetrate to the surface (observation side) of the antenna element 4. Thus, the tip of the screw 71 threadedly connected in the recess 41 does not protrude toward the observation side of the antenna element 4, but stops at the back side, and does not affect the appearance.

[0072] The screw 71 as the first adjustment member may be arranged in contact with the antenna element 4 and is not limited to being fixed to the antenna element 4 by screwing as in the example shown in the figure. A pin without a thread cut therein may be arranged in the recess 41 simply by press fitting.

[0073] Furthermore, the first adjustment member may be capacitively coupled to the antenna element 4 . In this case, one end side thereof may not be in contact with the antenna element 4 , but may be arranged close to the antenna element 4 to the extent that the first adjustment member is capacitively coupled to the antenna element 4 .

[0074] In the peripheral wall of the main body housing 1, a portion where the characteristic adjustment portion 7 is provided is formed along the thickness direction ( Figure 2 A hole portion 12 that penetrates the cavity (in the Z-axis direction).

[0075] In the present embodiment, the hole 12 formed in the metal main body case 1 is a cylindrical portion formed of a metal material into which the other end side of the first adjustment member (the screw 71 in the present embodiment) is inserted.

[0076] The hole portion 12 as the cylindrical portion of the present embodiment is formed in the main body case 1 in contact with the back cover 3 as the GND, and is a conductive portion having the same potential as the GND.

[0077] In addition, if Figure 3 and Figure 4 As shown, the dielectric member 5 is also provided with a through hole 51 at a position corresponding to the hole 12 , and the screw 71 can be inserted into the hole 12 through the through hole 51 .

[0078] Furthermore, a nut 72 as a second adjustment member formed of a dielectric such as resin is disposed in the hole 12 as the cylindrical portion so as to be interposed between the hole 12 as the cylindrical portion and the screw 71 as the first adjustment member.

[0079] The nut 72 of the present embodiment has a thickness equal to the thickness of the main body case 1 (the height of the main body case 1, Figure 2 The height in the Z-axis direction is roughly the same height.

[0080] The insertion side end portion ( Figure 3 and Figure 4 The lower end portion in the middle is received by the nut 72, and even when the screw 71 is set to the longest state, it will not contact the main body shell 1 (the hole portion 12 formed in the main body shell 1, etc.) or the metal back cover 3.

[0081] In this embodiment, the screw 71 is a headless screw having an external thread formed on the outer peripheral surface from one end to the other end, and the nut 72 has an internal thread formed on the inner peripheral surface to be threadedly engaged with the external thread formed on the screw 71 .

[0082] In this embodiment, the screw 71 as the first adjustment member and the nut 72 as the second adjustment member are threadedly coupled to each other, thereby making the interior of the main body housing 1 watertight. In this case, the threaded cut portions of the screw 71 and the nut 72 (i.e., the external thread of the screw 71 and the internal thread of the nut 72) function as a sealing mechanism for making the interior of the main body housing 1 watertight.

[0083] In addition, the structure in which the screw 71 and the nut 72 are threadedly connected is not essential, and the first adjustment member such as a simple pin may be received by the second adjustment member embedded in the hole 12 .

[0084] In this case, as a sealing mechanism (first sealing mechanism) for making the interior of the main body shell 1 watertight, a gasket, O-ring, etc. may be additionally provided around the axis of the screw 71 for sealing between the hole 12 as the cylindrical portion or the nut 72 as the second adjustment component and the screw 71 as the first adjustment component.

[0085] Next, the assembly method of the watch body as the electronic device in this embodiment and the method for adjusting the antenna characteristics are described. In addition, as the method for adjusting the antenna characteristics, in the following embodiment, the case of adjusting the antenna frequency is described, but the antenna characteristics that can be adjusted by this structure are not limited to the frequency.

[0086] When the timepiece body 100 is assembled, a hole 12 penetrating in the thickness direction is formed at a predetermined position on the peripheral wall of the metal case body 1. The case body 1 contains a substrate 6 and various other electronic components.

[0087] On the other hand, a recessed portion 41 is provided at a position corresponding to the hole 12 on the main body housing 1 side in the assembled state on the back side (lower side, non-observation confirmation side) of the annular antenna element 4, and an internal thread is formed on the inner peripheral surface of the recessed portion 41. Furthermore, one end side of a screw 71 having an external thread formed on the outer peripheral surface as a first adjustment member is threadedly connected in the recessed portion 41.

[0088] If all screws 71 (in Figure 1 In the example shown, four are assembled in the recess 41 of the antenna element 4, the antenna element 4 is arranged on the upper side of the main body shell 1, and the other end side (free end side) of the screw 71 installed on the back side of the antenna element 4 is inserted into the hole 12 of the main body shell 1.

[0089] In addition, the nut 72 as the second adjustment member is inserted into the hole portion 12 as the through hole from below, and the external thread of the screw 71 is threadedly engaged with the internal thread of the nut 72. As a result, the nut 72 as the second adjustment member is interposed between the hole portion 12 as the cylindrical portion as the conductor portion having the same potential as GND and the screw 71 as the first adjustment member. That is, a cylindrical conductor of GND potential is arranged on the outer periphery of the metal screw 71 and the resin nut 72 surrounding the metal screw 71.

[0090] After the entire nut 72 is screwed in until it enters the hole 12 , the antenna characteristics (frequency in this embodiment) in this state are checked.

[0091] If the inspection result shows that the antenna is in a state of resonance with the radio wave of the desired frequency, the adjustment of the antenna characteristics is terminated.

[0092] On the other hand, if the inspection result shows 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.

[0093] Figure 5 This is a graph showing the trend of the result of simulating the relationship between the length of the screw and the frequency (gain peak frequency) of the antenna.

[0094] In the case where the height (length) of the nut 72 is constant as in the present embodiment ( Figure 3 and Figure 4 , showing the case where the nut 72 is provided throughout the entire height direction of the main body housing 1, as Figure 5 As shown, it can be seen that as the length [mm] of the screw 71 increases, the frequency [GHz] of the antenna tends to decrease.

[0095] That is, in the present embodiment, the screw 71 is a metal component in contact with the antenna element 4, but if the length [mm] of the screw 71 is increased, the overlap of the resin nut 72 and the metal screw 71 in the hole 12 provided as a cylindrical portion, which is a conductive portion having the same potential as GND, increases accordingly. Therefore, the electrostatic capacitance formed between GND and the antenna element 4 (in other words, the capacitance of the capacitor formed between the antenna element 4 and GND) increases. As a result, the frequency of the antenna tends to decrease.

[0096] Therefore, if the inspection result shows that the current antenna frequency is higher than the expected frequency, Figure 4 As shown in FIG. 1 , the length of the screw 71 as the first adjustment member is increased. As a result, the electrostatic capacitance between the antenna element 4 and the GND (back cover 3) increases, and the antenna frequency decreases.

[0097] Conversely, when the current antenna frequency is lower than the desired frequency, the length of the screw 71 as the first adjustment member is shortened. This reduces the capacitance between the antenna element 4 and the GND (back cover 3) and increases the antenna frequency.

[0098] In this way, the length of the screw 71 is adjusted until the antenna frequency reaches a desired level.

[0099] In the present embodiment, the characteristic adjustment portions 7 are provided at four locations in the circumferential direction of the main body case 1 as described above, but the length of the screw 71 may be adjusted in all of the four characteristic adjustment portions 7 or in any one of them.

[0100] When adjustment is performed in a plurality of characteristic adjustment sections 7 , the adjustment amount may be the same or may be changed in each characteristic adjustment section 7 .

[0101] The adjustment may be simulated in advance, and when the timepiece body 100 is assembled, each component may be assembled in a state set based on the simulation result.

[0102] When the antenna frequency reaches a desired frequency, the adjustment of the antenna characteristics is completed, and the back cover 3 is attached from the bottom side of the main body housing 1 to close the lower opening portion.

[0103] At this time, if Figure 3 and Figure 4 As shown, the back cover 3 is arranged so as to cover the resin nut 72, so that the resin nut 72 can be hidden so as not to be seen from the outside.

[0104] Alternatively, the back cover 3 may be fixed to the main body case 1 using a fixing mechanism having excellent appearance, such as a metal screw. Thus, the watch body 100 having excellent appearance can be obtained.

[0105] Through the above steps, the assembly of the timepiece body 100 is completed.

[0106] In such a structure, by finely adjusting the length of the screw 71, the antenna characteristics (frequency, etc.) can be calibrated to a desired level.

[0107] As described above, according to the present embodiment, the watch body 100 as an electronic device comprises: a main body case 1; a ring-shaped antenna element 4, which is arranged on the upper side of the main body case 1; a screw 71 as a first adjustment component, which is formed of a metal material, one end of which is arranged in contact with the antenna element 4, and the other end of which is arranged in the main body case 1; a hole portion 12 as a cylindrical portion, which is formed of a metal material, for inserting the other end of the screw 71; and a nut 72 as a second adjustment component, which is formed of a dielectric, arranged in the hole portion 12 and between the hole portion 12 and the screw 71.

[0108] By adopting such a structure, even if the design of the watch body 100 as an electronic device is changed after the configuration position, structure, shape of the peripheral components, etc. of the antenna (antenna element 4) are once determined, there is no need for the labor, time, and cost of starting over from the antenna design, and the frequency and other characteristics of the antenna can be easily adjusted using the screw 71 as the first adjustment component and the nut 72 as the second adjustment component.

[0109] Thus, even when various parts are changed after the structure and various designs of the timepiece body 100 as an electronic device are determined, the antenna characteristics such as the frequency can be easily adjusted and accurate calibration can be achieved.

[0110] Furthermore, since the antenna characteristics can be accurately calibrated in the timepiece body 100 (electronic device) as a product, the performance of the antenna can be fully utilized, and the timepiece body 100 (electronic device) having a highly sensitive antenna can be provided.

[0111] In addition, the first adjustment member (screw 71) is not limited to the case where one end side is arranged in contact with the antenna element 4. The first adjustment member can be configured to be arranged close to the antenna element 4 to a certain extent to enable capacitive coupling with the antenna element 4, and it is considered that there is a large degree of freedom in the arrangement of the member that functions as the first adjustment member.

[0112] Furthermore, in the present embodiment, the degree of overlap (the size of the overlapping range) of the screw 71 as the first adjustment member and the nut 72 as the second adjustment member in the hole 12 as the cylindrical portion can be adjusted.

[0113] Specifically, by changing the length of the screw 71 as the first adjustment member inserted into the hole 12 as the cylindrical portion, the overlap degree (size of the overlapping range) of the screw 71 and the nut 72 as the second adjustment member in the hole 12 can be adjusted.

[0114] This makes it possible to easily adjust antenna characteristics such as antenna frequency according to the design of an electronic device in which the antenna is incorporated.

[0115] Furthermore, in this embodiment, since the adjustment is performed by changing the length of the screw 71, nuts of the same shape and size can be used for the nuts 72. Therefore, mass production capability is excellent.

[0116] Furthermore, when the first adjustment member is a metal screw 71 as in the present embodiment, it can be manufactured and fine-tuned relatively easily, thereby preventing an increase in cost.

[0117] Furthermore, when the second adjustment member is a nut 72 formed of resin and having a shape corresponding to the first adjustment member (the screw 71 in this embodiment) as in the present embodiment, it can be manufactured relatively easily, thereby preventing an increase in cost.

[0118] Furthermore, in the present embodiment, the screw 71 as the first adjustment member is entirely disposed on the non-observation side of the antenna element 4 .

[0119] Therefore, it is possible to avoid the influence on the appearance of the electronic device (timepiece body 100 ) due to the provision of the screw 71 , and thus the electronic device (timepiece body 100 ) can be made excellent in design.

[0120] Furthermore, in the present embodiment, the external thread of the screw 71 as the first adjustment member is threadedly connected to the internal thread of the nut 72 as the second adjustment member.

[0121] Therefore, the threaded connection portion between the male and female threads functions as a sealing mechanism for making the interior of the main body case 1 watertight, and the watertightness of the interior of the main body case 1 can be ensured without providing a separate sealing mechanism.

[0122] In addition, the sealing mechanism for making the interior of the main body housing 1 watertight is not limited to the threaded connection portion between the external thread and the internal thread. For example, a washer, an O-ring, etc. may be provided around the shaft of the screw 71 as the first adjustment member, etc., as a sealing mechanism (first sealing mechanism) for sealing the hole 12 as the cylindrical portion or the nut 72 as the second adjustment member and the screw 71 as the first adjustment member to make the interior of the main body housing 1 watertight.

[0123] In this case, the watertightness of the interior of the main body casing 1 can be ensured more reliably.

[0124] Furthermore, when the main body casing 1 is a metal casing formed of a metal material as in the present embodiment, the metal cylindrical portion can be constituted by the hole portion 12 formed in the main body casing 1 .

[0125] Therefore, there is no need to prepare other members, and a simple structure can be achieved.

[0126] Furthermore, in the present embodiment, the dielectric member 5 is disposed between the antenna element 4 and the main body casing 1 .

[0127] Thus, even when the antenna element 4 is disposed on the metal main body casing 1 , a short circuit does not occur.

[0128] Furthermore, when the dielectric member 5 is disposed between the antenna element 4 and the main body casing 1 in this manner, the dielectric member can also be used as a sealing mechanism (second sealing mechanism) for ensuring watertightness inside the main body casing 1 .

[0129] In this case, there is no need to provide a sealing mechanism separately, and the number of components can be reduced.

[0130] Furthermore, in the present embodiment, the resin nut 72 is used as the second adjustment member, but the back cover 3 as a cover member closing the lower opening of the main body case 1 is arranged so as to cover the nut 72 .

[0131] Therefore, the resin nut 72 is prevented from being protruded from the exterior, and an electric device (timepiece body 100 ) having excellent design can be realized.

[0132] Alternatively, the back cover 3 may be fixed to the main body case 1 by metal screws. In this case, the back cover 3 can be firmly fixed and the watch body 100 having an excellent appearance can be realized.

[0133] [Second embodiment]

[0134] Next, refer to Figure 6 to Figure 9 A second embodiment of the electronic device, antenna characteristic adjustment method, and electronic device assembly method of the present invention is described. In addition, in the above-mentioned first embodiment, an example is shown in which the characteristic adjustment unit adjusts the antenna characteristic by changing the length of the screw as the first adjustment component. In contrast, in this embodiment, the characteristic adjustment unit adjusts the antenna characteristic by changing the height of the nut as the second adjustment component, which is different from the first embodiment. In the following, the points that are different from the first embodiment are described in particular.

[0135] also, Figure 6 to Figure 9 In the present invention, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

[0136] Figure 6 It is a cross-sectional view of a main part of a timepiece body as an electronic device in this embodiment.

[0137] and, Figure 7 and Figure 8 yes Figure 6 An enlarged cross-sectional view of the periphery of the characteristic adjustment portion surrounded by a dashed line frame VII in FIG.

[0138] like Figure 7 and Figure 8As shown, the characteristic adjustment section 8 provided in the timepiece body 200 as the electronic device of the present embodiment includes a screw 81 as a first adjustment member, a nut 82 as a second adjustment member, and a hole 12 as a cylindrical portion.

[0139] In this embodiment, the length of the screw 81 as the first adjustment member is constant and has a length equal to the thickness of the main body case 1 (the height of the main body case 1, Figure 6 The height in the Z-axis direction is roughly the same length.

[0140] In addition, the insertion side end portion ( Figure 7 and Figure 8 The lower end portion in the middle is received by the nut 82 and does not come into contact with the main body housing 1 (the hole 12 formed in the main body housing 1, etc.) or the metal back cover 3.

[0141] The nut 82 is formed of a dielectric such as resin as in the first embodiment, and is disposed between the hole portion 12 as the cylindrical portion and the screw 81 as the first adjustment member. By disposing the nut 82 between the hole portion 12 and the screw 81, a cylindrical conductor of GND potential is disposed on the outer periphery of the metal screw 81 and the resin nut 82 surrounding the metal screw 81.

[0142] In the present embodiment, the nut 82 as the second adjustment member is a member whose height is adjusted in order to adjust the characteristics such as the frequency of the antenna.

[0143] In addition, since other structures are the same as those of the first embodiment, the same symbols are attached to the same components and their description is omitted.

[0144] Next, a method for adjusting the antenna characteristics in this embodiment will be described. Note that since the method for assembling the watch body 200 (electronic device) other than the adjustment of the antenna characteristics is the same as that of the first embodiment, the description thereof will be omitted.

[0145] As in the first embodiment, when the result of checking the antenna characteristics (frequency in this embodiment) shows that the antenna is in a state of resonance with radio waves of a desired frequency, the adjustment of the antenna characteristics is terminated.

[0146] On the other hand, if the inspection result shows 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.

[0147] Fig. 9 This is a graph showing the trend of the result of simulating the relationship between the height of the nut and the frequency (gain peak frequency) of the antenna.

[0148] When the length of the screw 81 is constant as in the present embodiment ( Figure 7 and Figure 8 , showing a case where screws 81 are provided over substantially the entire height direction of the main housing 1, as Fig. 9 As shown, it can be seen that the frequency [GHz] of the antenna tends to decrease as the height (length) [mm] of the nut 82 increases.

[0149] That is, in the present embodiment, the screw 81 is a metal component in contact with the antenna element 4, but if the height (length) [mm] of the nut 82 is increased, the overlap of the resin nut 82 and the metal screw 81 in the hole 12 provided as a cylindrical portion, which is a conductive portion having the same potential as GND, increases accordingly. Therefore, the electrostatic capacitance formed between GND and the antenna element 4 (in other words, the capacitance of the capacitor formed between the antenna element 4 and GND) increases. As a result, the frequency of the antenna tends to decrease.

[0150] Therefore, when the antenna characteristics are tested and the current antenna frequency is higher than the expected frequency, Figure 8 As shown in FIG. 1 , the height of the nut 82 as the second adjustment member is increased. As a result, the electrostatic capacitance between the antenna element 4 and the GND (back cover 3) increases, and the antenna frequency decreases.

[0151] Conversely, when the current antenna frequency is lower than the desired frequency, the height of the nut 82 as the second adjustment member is lowered. This reduces the capacitance between the antenna element 4 and the GND (back cover 3) and increases the antenna frequency.

[0152] In this way, the height of the nut 82 is adjusted until the antenna frequency reaches a desired level.

[0153] Furthermore, similarly to the first embodiment, when a plurality of characteristic adjustment sections 8 are provided, adjustment may be performed in all of the plurality of characteristic adjustment sections 8 or in any one of them.

[0154] When adjustment is performed in a plurality of characteristic adjustment sections 8 , the adjustment amount may be the same or may be changed for each characteristic adjustment section 8 .

[0155] In addition, since other points are the same as those in the first embodiment, their description is omitted.

[0156] In such a structure, by finely adjusting the height of the nut 82, the antenna characteristics (frequency, etc.) can be calibrated to a desired level.

[0157] As described above, according to the present embodiment, the same effects as those of the first embodiment can be obtained, and in addition, the following effects can be obtained.

[0158] That is, in this embodiment, the degree of overlap (the size of the overlapping range) between the screw 81 as the first adjustment component and the nut 82 as the second adjustment component in the hole portion 12 as the cylindrical portion is adjusted by changing the height (length) of the nut 82 formed of resin as the second adjustment component.

[0159] The resin nut 82 can be manufactured relatively easily, does not increase labor, time, and cost, and can easily adjust antenna characteristics such as antenna frequency according to the design of the electronic device (timepiece body 200) in which the antenna is incorporated.

[0160] Furthermore, in this case, since the metal screws 81 can be handled with screws of the same shape and size, mass production capability is excellent.

[0161] [Third Embodiment]

[0162] Next, refer to Fig.10 and Fig.11 A third embodiment of the electronic device, antenna characteristic adjustment method, and electronic device assembly method of the present invention is described. In addition, in the third embodiment, the characteristic adjustment unit adjusts the antenna characteristics by changing the length of the screw as the first adjustment member, which is the same as the first embodiment described above, but in the first embodiment described above, an example of a case where the main body housing 1 is formed of a metal material is shown, whereas in this embodiment, the main body housing 1 is formed of a resin material or the like, which is different from the first embodiment. In the following, the points that are different from the first embodiment are described in particular.

[0163] also, Fig.10 and Fig.11 In the present invention, the same components as those in the first embodiment are denoted by the same reference numerals and description thereof will be omitted.

[0164] Fig.10 and Fig.11 It is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion in this embodiment.

[0165] In the present embodiment, the main body case 1 is formed of a hard resin such as ABS resin.

[0166] In addition, the material forming the main body shell 1 is not limited to resin, and various other materials such as ceramics can be applied. In addition, various composite materials formed by mixing carbon fillers, glass fibers, etc. in various resins can also be used. By forming the main body shell 1 with such a composite material, the strength of the main body shell 1 can be improved.

[0167] The antenna element 4 is arranged on the main body casing 1 .

[0168] When the main body casing 1 is made of resin as in the present embodiment, even if the antenna element 4 is disposed directly on the main body casing 1 , a short circuit or the like does not occur.

[0169] Therefore, if Fig.10 and Fig.11 As shown, in this embodiment, there is no need to arrange an insulating member such as a dielectric member 5 between the antenna element 4 and the main body case 1. In order to more reliably ensure the watertightness of the inside of the main body case 1, a resin member or the like may be arranged between the antenna element 4 and the main body case 1.

[0170] Similar to the first embodiment and the like, a screw 91A as a first adjustment member is provided on the back surface side of the antenna element 4 so as to be in contact with the antenna element 4 .

[0171] In the present embodiment, the screw 91A as the first adjustment member is a member whose length is adjusted in order to adjust the characteristics such as the frequency of the antenna.

[0172] The electronic device (watch body) of the present embodiment includes a plurality of characteristic adjustment units 9A, similarly to the first embodiment and the like.

[0173] The characteristic adjustment portion 9A in the present embodiment includes a cylindrical member 13 as a cylindrical portion in addition to a screw 91A as a first adjustment member and a nut 92A as a second adjustment member.

[0174] In the main body housing 1, a peripheral wall portion corresponding to the position where the screw 91A as the first adjustment member constituting the characteristic adjustment portion 9A is provided is formed along the thickness direction (height direction, Fig.10 and Fig.11 A hole portion 12 that penetrates (in the up-down direction).

[0175] A cylindrical member 13 is disposed in the hole 12 .

[0176] The cylindrical member 13 has openings at the top and bottom. Fig.10 and Fig.11 As shown, the lower end of the cylindrical member 13 is in contact with the back cover 3. In the present embodiment, the back cover 3 is formed of a conductor such as metal and functions as GND, and the cylindrical member 13 as a cylindrical portion in contact with the back cover 3 is a conductor portion having the same potential as GND. By arranging the cylindrical member 13 on the outer periphery of the metal screw 91A and the resin nut 92A surrounding the metal screw 91A and the resin nut 92A surrounding the metal screw 91A, a cylindrical conductor having the GND potential is arranged around the screw 91A and the nut 92A.

[0177] The lower end of the tubular member 13 may be in contact with the back cover 3 and the upper end may be spaced apart from the antenna element 4 to a certain extent (to such an extent that capacitive coupling does not occur). The height at which the tubular member 13 is provided in the hole 12 is appropriately set.

[0178] A nut 92A as a second adjustment member is disposed in the tubular member 13. In the present embodiment, the height (length) of the nut 92A is constant, and for example, in the illustrated example, the nut 92A is provided to have a height substantially the same as that of the tubular member 13.

[0179] In addition, since other structures are the same as those of the first embodiment, the same symbols are attached to the same components and their description is omitted.

[0180] Next, a method for adjusting the antenna characteristics in this embodiment will be described. Note that since the method for assembling the watch body (electronic device) other than the adjustment of the antenna characteristics is substantially the same as that of the first embodiment, the description thereof will be omitted.

[0181] As in the first embodiment, when the result of checking the antenna characteristics (frequency in this embodiment) shows that the antenna is in a state of resonance with radio waves of a desired frequency, the adjustment of the antenna characteristics is terminated.

[0182] On the other hand, if the inspection result shows 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.

[0183] In the case where the height (length) of the nut 92A is constant as in the present embodiment ( Fig.10 and Fig.11 , showing the case where the nut 92A is provided over substantially the entire height direction of the tubular member 13, there is a tendency that the frequency [GHz] of the antenna becomes lower as the length [mm] of the screw 91A becomes longer.

[0184] That is, in the present embodiment, the screw 91A is a metal component in contact with the antenna element 4, but if the length [mm] of the screw 91A becomes longer, the overlap between the resin nut 92A and the metal screw 91A in the cylindrical part 13, which is a conductive part having the same potential as GND, becomes greater. Therefore, the electrostatic capacitance formed between GND and the antenna element 4 (in other words, the capacitance of the capacitor formed between the antenna element 4 and GND) becomes larger. As a result, the frequency of the antenna tends to decrease.

[0185] Therefore, if the inspection result shows that the current antenna frequency is higher than the expected frequency, Fig.11As shown in FIG. 1 , the length of the screw 91A as the first adjustment member is increased. As a result, the electrostatic capacitance between the antenna element 4 and the GND (back cover 3) increases, and the antenna frequency decreases.

[0186] Conversely, when the current antenna frequency is lower than the desired frequency, the length of the screw 91A as the first adjustment member is shortened. This reduces the capacitance between the antenna element 4 and the GND (back cover 3) and increases the antenna frequency.

[0187] In this way, the length of the screw 91A is adjusted until the antenna frequency reaches a desired level.

[0188] Furthermore, similarly to the first embodiment and the like, when a plurality of characteristic adjustment sections 9A are provided, adjustment may be performed in all of the plurality of characteristic adjustment sections 9A or in any one of them.

[0189] When adjustment is performed in a plurality of characteristic adjustment sections 9A, the adjustment amount may be the same or may be changed in each characteristic adjustment section 9A.

[0190] In addition, since other points are the same as those in the first embodiment, their description is omitted.

[0191] In such a configuration, the antenna characteristics (frequency, etc.) can be calibrated to a desired level by finely adjusting the length of the screw 91A.

[0192] As described above, according to the present embodiment, in addition to the same effects as those of the first embodiment, the following effects can be obtained.

[0193] That is, in this embodiment, when the main body shell 1 is formed of resin, a metal cylindrical part 13 is provided in the main body shell as a cylindrical part, and a metal screw 91A as a first adjustment part which is arranged in contact with or close to the annular antenna element 4 arranged on the upper side of the main body shell 1 is arranged so that its other end side is inserted into the cylindrical part 13, and a nut 92A as a second adjustment part which is formed of a dielectric is arranged in a manner between the cylindrical part 13 and the screw 91A. In this case, by changing the length of the screw 91A inserted into the cylindrical part 13, the overlap degree (the size of the overlap range) of the screw 91A and the nut 92A in the cylindrical part 13 is adjusted, thereby adjusting the antenna characteristics such as the frequency.

[0194] Thus, even in the case of an electronic device (clock body) having a resin case, an antenna having desired characteristics (frequency, etc.) can be easily obtained by simply changing the length of screw 91A as the first adjustment member without changing other structures and designs.

[0195] [Fourth Embodiment]

[0196] Next, refer to Fig.12 and Fig.13 A fourth embodiment of the electronic device, antenna characteristic adjustment method, and electronic device assembly method of the present invention is described. In addition, in the fourth embodiment, the characteristic adjustment unit adjusts the antenna characteristics by changing the height of the nut as the second adjustment member, which is the same as the second embodiment described above, but in the second embodiment described above, an example of a case where the main body housing 1 is formed of a metal material is shown. In contrast, in this embodiment, as in the third embodiment, the main body housing 1 is formed of a resin material, etc., which is different from the second embodiment. In the following, the points that are different from the second and third embodiments are described in particular.

[0197] also, Fig.12 and Fig.13 In the present invention, the same components as those in the second and third embodiments are denoted by the same reference numerals and their descriptions are omitted.

[0198] Fig.12 and Fig.13 It is an enlarged cross-sectional view of the periphery of the characteristic adjustment portion in this embodiment.

[0199] Similar to the first embodiment and the like, the electronic device (watch body) of the present embodiment includes a main body case 1 , an antenna element 4 , a plurality of characteristic adjustment sections 9B, and the like.

[0200] Similar to the third embodiment, the main body case 1 is a resin case formed of various resins.

[0201] Furthermore, similar to the third embodiment, the characteristic adjustment portion 9B includes a cylindrical member 13 as a cylindrical portion in addition to a screw 91B as a first adjustment member and a nut 92B as a second adjustment member.

[0202] The cylindrical member 13 is in contact with the back cover 3 functioning as GND and is a conductor portion having the same potential as GND.

[0203] like Fig.12 and Fig.13 As shown, in the present embodiment, the length of the screw 91B as the first adjustment member is constant, and in the illustrated example has a length substantially the same as the thickness of the main body casing 1 (the height of the main body casing 1 ).

[0204] The end portion (insertion side) of the screw 91B which is inserted into the tubular member 13 Fig.12 and Fig.13 The lower end portion in the middle is received by the nut 92B and does not contact the tubular member 13 or the metal back cover 3 provided in the hole 12 of the main body housing 1.

[0205] As in the second and third embodiments, the nut 92B is formed of a dielectric such as resin and is disposed between the cylindrical member 13 as the cylindrical portion and the screw 91B as the first adjustment member. By disposing the cylindrical member 13 on the outer periphery of the metal screw 91B and the resin nut 92B surrounding it, a cylindrical conductor of GND potential is disposed around the screw 91B and the nut 92B.

[0206] In the present embodiment, the nut 92B as the second adjustment member is a member whose height is adjusted in order to adjust the characteristics such as the frequency of the antenna.

[0207] In addition, since other structures are the same as those of the second and third embodiments, the same symbols are attached to the same components and their description is omitted.

[0208] Next, the method of adjusting the antenna characteristics in this embodiment will be described. Note that since the method of assembling the watch body (electronic device) other than the adjustment of the antenna characteristics is substantially the same as that of the second and third embodiments, the description thereof will be omitted.

[0209] As in the second and third embodiments, when the antenna characteristics (frequency in this embodiment) are checked and the antenna is in a state of resonance with radio waves of a desired frequency, the antenna characteristics adjustment is terminated.

[0210] On the other hand, if the inspection result shows 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.

[0211] When the length of the screw 91B is constant as in the present embodiment ( Fig.12 and Fig.13 , it is shown that in the case where the screw 91B is provided over substantially the entire height direction of the main body housing 1, there is a tendency that the frequency [GHz] of the antenna becomes lower as the height (length) [mm] of the nut 92B becomes longer.

[0212] That is, in the present embodiment, the screw 91B is a metal component in contact with the antenna element 4, but if the height (length) [mm] of the nut 92B becomes higher, then the overlap of the resin nut 92B and the metal screw 91B in the cylindrical member 13, which is a cylindrical portion and is a conductive portion having the same potential as GND, becomes greater. Therefore, the electrostatic capacitance formed between GND and the antenna element 4 (in other words, the capacitance of the capacitor formed between the antenna element 4 and GND) becomes larger. As a result, the frequency of the antenna tends to decrease.

[0213] Therefore, when the antenna characteristics are tested and the current antenna frequency is higher than the expected frequency, Fig.13As shown in FIG. 1 , the height of the nut 92B as the second adjustment member is increased. As a result, the electrostatic capacitance between the antenna element 4 and the GND (back cover 3) increases, and the antenna frequency decreases.

[0214] Conversely, when the current antenna frequency is lower than the desired frequency, the height of the nut 92B as the second adjustment member is lowered. This reduces the electrostatic capacitance between the antenna element 4 and the GND (back cover 3), and increases the antenna frequency.

[0215] In this manner, the height of the nut 92B is adjusted until the antenna frequency reaches a desired level.

[0216] Furthermore, similarly to the second and third embodiments, when a plurality of characteristic adjustment sections 9B are provided, adjustment may be performed in all of the plurality of characteristic adjustment sections 9B or in any one of them.

[0217] When adjustment is performed in a plurality of characteristic adjustment sections 9B, the adjustment amounts may be the same or may be varied for each characteristic adjustment section 9B.

[0218] In addition, other points are the same as those of the second and third embodiments, and therefore their descriptions are omitted.

[0219] In such a structure, by finely adjusting the height of the nut 92B, the antenna characteristics (frequency, etc.) can be calibrated to a desired level.

[0220] As described above, according to the present embodiment, when the main body shell 1 is formed of resin, a metal cylindrical part 13 is provided in the main body shell as a cylindrical part, a metal screw 91B as a first adjustment part which is arranged in contact with or close to the annular antenna element 4 arranged on the upper side of the main body shell 1 is arranged so that its other end side is inserted into the cylindrical part 13, and a nut 92B as a second adjustment part which is formed of a dielectric is arranged in a manner interposed between the cylindrical part 13 and the screw 91B. In this case, by changing the height of the nut 92B arranged in the cylindrical part 13, the overlap degree (the size of the overlap range) of the screw 91B and the nut 92B in the cylindrical part 13 is adjusted, thereby adjusting the antenna characteristics such as the frequency.

[0221] Thus, even in the case of an electronic device (clock body) having a resin case, an antenna with desired characteristics (frequency, etc.) can be easily obtained by simply changing the height of the nut 92B as the second adjustment member without changing other structures and designs.

[0222] The nut 92B is a resin component, and the height can be changed and adjusted relatively easily.

[0223] Furthermore, although the embodiment of the present invention has been described above, the present invention is not limited to such embodiment, and various modifications can be made without departing from the gist of the present invention.

[0224] For example, in the above-described embodiments, an example is shown in which the screw as the first adjustment member is a headless screw having an external thread formed on the entire circumference thereof, but the structure of the screw is not limited to this.

[0225] For example, it is also possible to form a structure in which an external thread is provided only on the portion of the screw that contacts the antenna element 4 (the portion inserted into the recess 41), and no external thread is provided on the portion inserted into the cylindrical portion. In this case, the second adjustment member made of resin may not be a nut formed with an internal thread, but may be a simple cylindrical member made of resin.

[0226] In addition, in such a case where the screw and the nut are not threadedly engaged depending on circumstances, the antenna element 4 cannot be fixed to the main body housing using the screw as the first adjustment member and the nut as the second adjustment member.

[0227] Therefore, in this case, the antenna element 4 is fixed to the main body casing by a fixing method such as press fitting.

[0228] Even when the screw as the first adjustment member is not fixed to the antenna element 4 (for example, when only one end of the screw contacts the antenna element 4 or when they are arranged close to each other and capacitively coupled), the antenna element 4 is fixed to the main body casing by press-fitting or the like.

[0229] Furthermore, in the above-mentioned embodiments, an example in which the screw as the first adjustment member is a headless screw is shown, but the first adjustment member is not limited to the headless screw.

[0230] For example, you can Fig.14 and Fig.15 As shown, a through hole 42 is provided in the antenna element 4 which passes through in the thickness direction, and head screws 91C, 91D such as countersunk screws and pan head screws having a screw head 911 with an outer diameter larger than the inner diameter of the through hole 42 are used as the first adjustment components of the characteristic adjustment parts 9C, 9D.

[0231] In addition, if Fig.14 and Fig.15 When no external thread is formed around the axis of the first adjustment member, as in the illustrated cap screws 91C and 91D, the second adjustment member that receives the member may not be a nut.

[0232] That is, for example Fig.14 and Fig.15As shown, the second adjustment component may be an adhesive 92C, 92D etc. which is filled into the cylindrical portion and functions as a dielectric in a manner interposed between the head screws 91C, 91D (or the screws exemplified in the first to fourth embodiments) serving as the first adjustment component and the cylindrical portion.

[0233] In this case, since it is not necessary to mold the second adjustment member into a predetermined shape such as a nut in advance, it is possible to more flexibly cope with design changes and the like.

[0234] Thus, when the second adjustment member is an adhesive 92C, 92D, etc., for example, the filling amount of the adhesive 92C, 92D may be set constant (for example, at Fig.14 The height in the middle is the same as the thickness direction of the main body shell 1. By changing the length of the first adjustment component (head screws 91C, 91D, screws) inserted therein, the overlap amount of the first adjustment component and the second adjustment component is adjusted to adjust the antenna characteristics.

[0235] Furthermore, similarly, when the second adjustment member is an adhesive 92C, 92D, etc., for example, the length of the first adjustment member (head screw 91C, 91D, screw) inserted into the adhesive 92C, 92D may be set to be constant (for example, at Fig.15 The antenna characteristics are adjusted by changing the height of the second adjustment component by changing the filling amount of the adhesives 92C and 92D serving as the second adjustment component and adjusting the overlap amount between the first adjustment component and the second adjustment component.

[0236] Furthermore, for example, in a case where the main body shell 1 is made of resin and an annular antenna element 4 is arranged on the upper side of the main body shell 1, the following components may also be provided to constitute the characteristic adjustment part 9E: a third adjustment component (for example, a screw 91E having a screw head 911), which is formed of a metal material and has one end side arranged in contact with or close to the antenna element 4 and the other end side arranged in the main body shell 1; and a fourth adjustment component (for example, a screw 92E having a screw head 921), which is formed of a metal material and has one end side inserted into the main body shell 1 from the other end side of the screw 91E and is arranged to be separated by a predetermined distance from the other end side of the screw 91E.

[0237] In this case, for example Fig.16As shown, a through hole 42 is formed in the antenna element 4, a first hole portion 14 that does not penetrate to the lower side is provided at a position of the main body case 1 corresponding to the through hole 42 in the antenna element 4, a through hole 31 is also formed in the back cover 3 at a position substantially corresponding to the through hole 42 in the antenna element 4, and a second hole portion 15 that does not penetrate to the upper side is provided at a position of the main body case 1 corresponding to the through hole 31. In this case, since the fourth adjustment member (for example, the screw 92E having the screw head 921) is in contact with the back cover 3, when the back cover 3 functions as GND, the fourth adjustment member is a conductive body portion having the same potential as GND.

[0238] Moreover, the antenna characteristics can be adjusted by adjusting the gap G between the screw 91E inserted from the top through the through hole 42 and the screw 92E inserted from the bottom through the through hole 31 to adjust the interval between the third adjustment component (screw 91E) and the fourth adjustment component (screw 92E).

[0239] Also 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, and the antenna characteristics can be adjusted while improving productivity.

[0240] Antenna element 4 and back cover 3 can be fixed to main body case 1 from above and below by screws 91E and 92E for adjusting antenna characteristics. Therefore, antenna element 4 and back cover 3 can be fixed and antenna characteristics can be adjusted without increasing the number of components.

[0241] Furthermore, in the above-described embodiments, an example is shown in which the nut 72 as the second adjustment member has an integral shape, but the shape of the nut and the like are not limited thereto.

[0242] The nut as the second adjustment member may also have a double nut structure, for example. In this case, the screw as the first adjustment member can be fixed firmly and hardly fall off.

[0243] Furthermore, when the nut as the second adjustment member is a double nut divided into a plurality of parts, the nuts may be arranged at intervals in the up-down direction.

[0244] When the nut as the second adjustment member is divided into a plurality of parts, more subtle adjustment of the antenna characteristics can be expected by finely adjusting each nut.

[0245] Furthermore, in the above-mentioned first and third embodiments, examples are shown in which the degree of overlap (the size of the overlapping range) of the first adjustment component (nut) in the cylindrical portion is adjusted by changing the length of the first adjustment component (screw) inserted into the cylindrical portion, and in the second and fourth embodiments, examples are shown in which the degree of overlap (the size of the overlapping range) of the first adjustment component (nut) in the cylindrical portion is adjusted by changing the height of the second adjustment component (nut), but the method of adjusting the antenna characteristics is not limited to this.

[0246] For example, the antenna characteristics may be adjusted by adjusting the degree of overlap (size of the overlapping range) between the first adjustment component (screw) and the second adjustment component (nut) in the cylindrical portion by changing both the length of the first adjustment component (screw) inserted into the cylindrical portion and the height of the second adjustment component (nut).

[0247] In this case, the first adjustment member (screw) and the second adjustment member (nut) can be adjusted separately, so that more flexible adjustment can be performed according to the shape of the electronic device on which the antenna is mounted.

[0248] Furthermore, in the above-described embodiments, the back cover 3 functions as GND and the cylindrical portion is in contact with the back cover 3 to have the same potential as GND. However, the component that functions as GND is not limited to the back cover 3 .

[0249] For example, when the back cover 3 is formed of resin or the like and a substrate or the like disposed on the back cover 3 functions as GND, the cylindrical portion is configured to be in contact with the substrate or the like functioning as GND to have the same potential as GND.

[0250] Furthermore, in the above-mentioned embodiments, an example is shown in which the characteristic adjustment part is embedded in the peripheral wall of the main body shell, but the characteristic adjustment part can be disposed in the main body shell and is not limited to the structure embedded in the peripheral wall of the main body shell as shown in the figure.

[0251] For example, the characteristic adjustment portion may be provided so as to protrude toward the inner side of the peripheral wall of the main body casing.

[0252] In the above-described embodiments, an example in which the electronic device is the timepiece body 100 is described, but the electronic device may be a device having an antenna and is widely applicable and is not limited to a timepiece (eg, a wristwatch).

[0253] For example, the electronic device of the present invention can be applied to various devices such as pedometers, altimeters, and barometers. In addition, the electronic device of the present invention can be applied to various terminal devices such as smartphones.

[0254] Several embodiments of the present invention have been described above, but 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 the scope of equivalents thereof.

Claims

1. An electronic device, characterized in that: have: A cylindrical main body shell; An antenna element, which is disposed on the main body shell; a first adjustment member formed of a metal material, one end of which is arranged in contact with or close to the antenna element and the other end of which is arranged in the main body housing; a cylindrical portion, which is formed to penetrate the peripheral wall of the cylindrical main body housing and is formed of a metal material, and into which the other end side of the first adjustment member is inserted; and The second adjustment member is formed of a dielectric and is disposed in the cylindrical portion and interposed between the cylindrical portion and the first adjustment member.

2. The electronic device according to claim 1, characterized in that: The antenna element is disposed on the upper side of the main body casing.

3. The electronic device according to claim 1 or 2, characterized in that: The potential of the cylindrical portion is the same as the potential of GND.

4. The electronic device according to claim 1, characterized in that: The size of the overlapping range between the first adjustment member and the second adjustment member in the cylindrical portion can be adjusted.

5. The electronic device according to claim 1 or 2, characterized in that: The first adjustment member is a metal screw.

6. The electronic device according to claim 1 or 2, characterized in that: The second adjustment member is a nut formed of resin and having a shape corresponding to that of the first adjustment member.

7. The electronic device according to claim 6, characterized in that: The nut has a double nut structure.

8. The electronic device according to claim 1 or 2, characterized in that: The second adjustment member is an adhesive that is filled in the cylindrical portion and functions as a dielectric.

9. The electronic device according to claim 1 or 2, characterized in that: The first adjustment member is entirely disposed on the non-observation side of the antenna element.

10. The electronic device according to claim 1 or 2, characterized in that: A first sealing mechanism is provided for making the interior of the main body housing watertight.

11. The electronic device according to claim 10, characterized in that: The first sealing mechanism is a gasket or an O-ring provided between the cylindrical portion or the second adjustment member and the first adjustment member.

12. The electronic device according to claim 1 or 2, characterized in that: The main body shell is formed of metal material. The cylindrical portion is constituted by a hole formed in the main body case.

13. The electronic device according to claim 12, characterized in that: A dielectric member is provided between the antenna element and the main body casing.

14. The electronic device according to claim 13, characterized in that: The dielectric member functions as a second sealing mechanism for making the interior of the main body case watertight.

15. The electronic device according to claim 1 or 2, characterized in that: The main body shell is formed of resin. The cylindrical portion is composed of a metallic cylindrical member provided in the main body case.

16. The electronic device according to claim 1, characterized in that: A cover member is provided on the lower side of the main body shell. The first adjustment member is disposed separately from the cover member.

17. The electronic device according to claim 1, characterized in that: A recess is formed on the lower surface of the antenna element. The one end side of the first adjustment member is arranged in the recessed portion of the antenna element.

18. An electronic device, characterized in that: have: A cylindrical main body shell formed of resin; A ring-shaped antenna element, which is disposed on the main body shell; a third adjustment member formed of a metal material, one end of which is arranged in contact with or close to the antenna element, and the other end of which is arranged in a first hole formed in a peripheral wall of the cylindrical main body housing; as well as The fourth adjustment member is formed of a metal material, one end of which is inserted from the other end of the third adjustment member into a second hole formed in the peripheral wall of the cylindrical main body shell, and is configured to be spaced a predetermined distance from the other end of the third adjustment member.

19. A method for adjusting antenna characteristics, used in the electronic device according to claim 1, characterized in that: In the case where a first adjustment member made of metal and arranged in contact with or close to an antenna element arranged in a main body housing is arranged so that the other end thereof is inserted laterally into a cylindrical portion formed of a metal material and provided in the main body housing, and a second adjustment member formed of a dielectric is arranged so as to be interposed between the cylindrical portion and the first adjustment member, By changing the length of the first adjustment member inserted into the cylindrical portion, an overlapping range of the first adjustment member and the second adjustment member in the cylindrical portion is adjusted.

20. A method for adjusting antenna characteristics, used in the electronic device according to claim 1, characterized in that: In the case where a first adjustment member made of metal and arranged in contact with or close to an antenna element arranged in a main body housing is arranged so that the other end thereof is inserted laterally into a cylindrical portion formed of a metal material and provided in the main body housing, and a second adjustment member formed of a dielectric is arranged so as to be interposed between the cylindrical portion and the first adjustment member, By changing the height of the second adjustment member, an overlapping range of the first adjustment member and the second adjustment member in the cylindrical portion is adjusted.

21. A method for adjusting antenna characteristics, used in the electronic device according to claim 1, characterized in that: In the case where a first adjustment member made of metal and arranged in contact with or close to an antenna element arranged in a main body housing is arranged so that the other end thereof is inserted laterally into a cylindrical portion formed of a metal material and provided in the main body housing, and a second adjustment member formed of a dielectric is arranged so as to be interposed between the cylindrical portion and the first adjustment member, The overlapping range of the first adjustment member and the second adjustment member in the cylindrical portion is adjusted by changing the length of the first adjustment member inserted into the cylindrical portion and the height of the second adjustment member.

22. A method for assembling an electronic device, characterized in that: The antenna element is arranged in the cylindrical main body casing. The first adjustment member formed of a metal material is arranged so that one end side thereof is in contact with or close to the antenna element and the other end side thereof is inserted into a metal cylindrical portion formed to penetrate through the peripheral wall of the main body housing. A second adjustment member formed of a dielectric is disposed in the cylindrical portion so as to be interposed between the cylindrical portion and the first adjustment member.

23. The method for assembling an electronic device according to claim 22, characterized in that: The first adjustment member is a metal screw. The second adjustment member is a resin nut. The main body housing has an opening at the bottom and is provided with a cover member for closing the opening. The cover member is arranged to cover the nut, and the cover member is fixed to the main body housing by a metal screw.

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