JP4143693B2 - Electronics - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a function of receiving radio waves transmitting predetermined information including time information, displaying or notifying the predetermined information, and simultaneously displaying time information or correcting the time information to accurate time information. In particular, the present invention relates to an electronic device that aims to improve radio wave reception performance when a metal exterior such as a metal case is used.
[0002]
More particularly, the present invention relates to an electronic device configured so as not to deteriorate the radio wave reception performance of the antenna unit even when the resonant antenna unit is disposed in the vicinity of the metal object or inside the metal exterior unit. It is.
[0003]
[Prior art]
[Patent Document 1]
Japanese Utility Model Publication No. 2-126408
[Patent Document 2]
Japanese Utility Model Publication No. 5-81787
[Patent Document 3]
International Publication WO95 / 27928
[Patent Document 4]
European Patent Publication No. 0382130
[Patent Document 5]
JP-A-11-64547
[Patent Document 6]
JP 2001-33571 A
[Patent Document 7]
JP 2001-30524 A
[Patent Document 8]
JP 2001-208875 A
[Patent Document 9]
Japanese Utility Model Publication No.57-131042
[Patent Document 10]
Japanese Patent Laid-Open No. 6-215842
[Patent Document 11]
JP 11-74138 A
[Patent Document 12]
Japanese Utility Model Publication No. 61-203516
[Patent Document 13]
Japanese Patent Application Laid-Open No. 2002-184637
2. Description of the Related Art Recently, a timepiece mounted on an electronic device that receives a long-wave standard radio wave with a time code and is in use, for example, an electronic device including a watch, a mobile phone, a wireless communication device, etc. Many electronic devices with a radio wave correction function that automatically adjusts the circuit time to the standard time have been commercialized.
[0004]
Here, a conventional problem will be described below by taking as an example a watch with a radio wave correction function (hereinafter referred to as a radio wave correction watch) which is a representative product of the electronic device.
[0005]
By the way, a radio-controlled timepiece that receives a standard radio wave, that is, a radio-controlled clock that can obtain an accurate time by receiving a standard radio wave (carrier wave) including time information and extracting the time information from this radio wave is already known. It has been. The radio waves including this time information have different frequencies for each country. For example, in Japan, 40 kHz and 60 kHz standard radio waves are transmitted under the jurisdiction of the Ministry of Internal Affairs and Communications and the Postal Service.
[0006]
FIG. 20 is a block diagram showing an outline of the function of such a radio-controlled timepiece. This radio-controlled timepiece is composed of an antenna 1, a radio-controlled timepiece receiver 2, a CPU 3, a display drive unit 4, an input device 5, and the like. In addition, although not shown in the figure, a display unit using hourly, minute, and second hands or liquid crystal is included.
[0007]
In this radio-controlled timepiece, first, an antenna 1 receives radio waves including time information. The radio clock receiver 2 amplifies and detects the radio wave received by the antenna 1, extracts time information from the radio wave, and outputs the time information. The CPU 3 outputs current time data based on the time information output from the radio clock receiver 2. The display driving unit 4 displays the current time on the display unit based on the current time data output from the CPU 3. The input device 5 is used, for example, when inputting operation information such as reset to the CPU 3.
[0008]
The time information (time code) included in the radio wave is a pulse signal with a period of 60 seconds, which varies depending on the country, but in Japan, a pulse having a width of 200, 500, or 800 msec every second. There is one. By combining these pulses, time information can be obtained in 60 seconds. The CPU 3 acquires time information (current time) by reading the pulse width of the pulse per second from the received pulse signal. And CPU corrects the display time in a display part via the display drive part 4 with the acquired time information. Therefore, the radio-controlled timepiece can always display an accurate time by correcting the display time at predetermined intervals based on the received time information.
[0009]
As such a radio wave correction timepiece, a wristwatch in which an antenna, a radio wave correction clock receiver, a CPU, a display drive unit and a display unit are housed in a case which is an antenna housing body has already been provided. As the material of the case, non-conductive materials such as synthetic resin and ceramic have been mainly used for the antenna to receive radio waves. That is, if the antenna is housed inside a case made of a conductive material such as metal, the magnetic flux generated in the vicinity of the antenna is absorbed by the conductive material and the resonance phenomenon is hindered, so that the reception function of the antenna is significantly reduced. .
[0010]
However, using a synthetic resin case to avoid such antenna reception obstacles not only leads to a decrease in the scratch resistance or chemical resistance of the case, but also a high-class feeling required for a wristwatch as an accessory. The aesthetics will also be impaired. For this reason, a radio wristwatch using a metal for the case has been proposed.
[0011]
FIG. 21 is a cross-sectional view showing an example of the structure of a radio-controlled wristwatch that uses metal for a part of the case. The wristwatch case 10 includes a trunk 11, a back cover 12 and a windshield 13. A movement 14 is arranged by a known means inside a body to which a band (not shown) is connected. Above the movement 14, a dial plate 15 and hands 16 serving as a time display section are also arranged by known means. And the bar antenna 17 which is a magnetic long wave antenna is arrange | positioned so that it may be located under the movement 14 and the back cover 12 above. The bar antenna 17 includes a magnetic core member 18 and a coil 20 wound around the magnetic core member 18, and is fixed to the upper surface of a synthetic resin holding member.
[0012]
The movement 14 includes the above-described radio timepiece receiver, CPU, and display drive unit, and is electrically connected to the bar antenna 17 by a conductive wire 21. Therefore, based on the standard radio wave received by the bar antenna 17, the CPU of the movement 14 drives a gear mechanism (not shown) in the display drive unit so as to always correct the position of the needle 16 on the display unit. Here, the vertical direction indicates the vertical direction in FIG.
[0013]
The body 11 is made of a conductive material and is not hollow, that is, made of a solid metal such as solid stainless steel. A windshield 13 made of glass which is a non-conductive material is fixed to the uppermost portion of the body 11 by a known means such as adhesion. The dial 15 is made of a nonconductive material such as synthetic resin or ceramic. The back cover 12 includes an annular edge frame 22 made of stainless steel fixed to the body 11 and a glass 23 fixed in the edge frame. As described above, this watch has an advantage that although the non-conductive material is visually recognized on the upper and lower surfaces of the case, the side surface portion of the case is made of metal, so that the high-class feeling and aesthetic appearance of the accessory are not impaired. (See [Patent Document 6] described later).
[0014]
On the other hand, in the radio-controlled timepiece, it has been considered that it is antenna characteristics and receiving circuit characteristics that determine reception performance.
[0015]
That is, according to conventional general technical knowledge, the lower limit of the input signal of the receiving circuit or the receiving IC is currently about 1 μV in signal amplitude. In order to obtain practical receiving performance, the receiving antenna is 40 to 50 dBμV. An output with a signal amplitude of about 1 μV must be obtained at an electric field strength (the strength of radio waves) of / m.
[0016]
Therefore, when there is a size constraint, it is common to use a resonance type receiving antenna that can increase the signal output.
[0017]
As a type of receiving antenna, a bar antenna in which a conducting wire is wound around a magnetic core is generally used because the wavelength of radio waves is long.
[0018]
In such a receiving antenna, the output of the receiving antenna is roughly proportional to the size of the receiving antenna, so it cannot be made very small in order to obtain practical reception performance. Performance and placement become a problem.
[0019]
Further, the output of the receiving antenna is extremely reduced when it is housed in a metal exterior.
[0020]
For this reason, in order to use radio waves, a wristwatch requires a part configuration or design that is completely different from the conventional timepiece part configuration and design, and also requires consideration not to impede reception performance.
[0021]
In wristwatches, small size, thinness, portability, design freedom, and texture (luxury) are important issues, and antenna built-in type and metal exterior are desired.
[0022]
In the case of conventional radio-controlled timepieces, the system of mounting or mounting the antenna is mainly used.
[0023]
When the material of the back cover / side of the wristwatch is metal, the receiving antenna is generally sheathed.
[0024]
In this case, the case of the receiving antenna is made of a non-metal such as plastic so as not to deteriorate the receiving performance. Therefore, the receiving antenna case has a large projecting shape, which is not only small, thin, and easy to carry, but also greatly reduces the design freedom.
[0025]
In the case of a system with a built-in receiving antenna, ceramics or plastic is used as the material for the watch exterior (back cover / side) in order not to deteriorate the receiving performance, but the watch becomes thicker because the strength of the material is small. Performance and portability are impaired, and design restrictions are increased.
[0026]
In addition, the wristwatch has a low appearance.
[0027]
For this reason, conventionally, as seen in, for example, Japanese Utility Model Application Laid-Open No. 2-126408 (Patent Document 1), a metal antenna is disposed in a leather band of a watch.
[0028]
In addition, as disclosed in Japanese Utility Model Laid-Open No. 5-81787 (Patent Document 2) by the present applicant, an antenna having a coil wound around a core is disposed between a dial and a windshield to prevent radio waves. A watch with a unique design at the same time as it is separated from the case body, or a wristwatch with an antenna attached to the side of the watch case of International Publication No. WO95 / 27928 (Patent Document 3). Is disclosed.
[0029]
Further, as disclosed in European Patent Publication No. 0382130 ([Patent Document 4]), there are antennas arranged in a ring shape on the upper surface of the case.
[0030]
However, in the conventional configuration in which the antenna is arranged in the band, since the antenna is built in the band, conduction with the electronic device main body has to be taken, and sufficient flexibility can be provided at the junction between the two. Absent.
[0031]
Furthermore, a metal band that interferes with radio waves cannot be used, and a watch band such as a rubber band must be used, which is limited in terms of material and design.
[0032]
In addition, when the antenna is arranged on the top or side of the watch, the thickness or size of the entire watch is increased or the design is restricted in order to separate the antenna from the metal part of the watch body. There's a problem.
[0033]
Further, in the case of European Patent Publication No. 0382130 (Patent Document 4) in which an antenna is arranged in a ring shape on the upper surface of the case, since there is no metal inside the ring, reception is impossible. There was also a problem that the antenna had to be separated from the watch.
[0034]
Further, in Japanese Patent Laid-Open No. 11-64547 (Patent Document 5), a coil is disposed in a recessed portion provided in a peripheral portion of a circuit board, and at the same time, a core is curved along the circumferential direction of the circuit board. Although the arranged wrist watch is disclosed, there is a problem that the manufacturing process becomes complicated and the assembly operation in the manufacturing process becomes complicated.
[0035]
On the other hand, Japanese Patent Application Laid-Open No. 2001-33571 (Patent Document 6) or Japanese Patent Application Laid-Open No. 2001-30524 (Patent Document 7) discloses glass or ceramic on the windshield and back cover of the wristwatch. A wristwatch is shown which is made of a non-metallic material, and in the middle part thereof, is made of a conventional metallic material so that sufficient radio waves reach the antenna.
[0036]
On the other hand, Japanese Patent Laid-Open No. 2001-208875 ([Patent Document 8]) discloses a technique relating to a wristwatch identification tag, and its basic technical configuration is in a ski resort or the like. At the time of boarding the lift, an identification tag is provided in the wristwatch of the user, and information is exchanged with the identification means provided at the lift boarding gate to identify whether or not the passenger is an authorized passenger. A system is disclosed.
[0037]
However, the basic technical idea of the technical configuration of the publication is that a strong high-frequency radio wave is transmitted from the identification means, and an IC circuit in the wristwatch is activated by bringing a wristwatch having the identification tag close thereto. And the identification tag information is read by the identification means.
[0038]
That is, in this publication, when the high frequency radio wave is received by the antenna provided in the timepiece, resonance occurs in the IC circuit in the timepiece, and as a result, the IC circuit receives the electromotive force and is activated. The identification tag information is read out and notified to the identification means wirelessly.
[0039]
Therefore, this publication suggests that even if the watch has a metal exterior, the antenna provided inside it operates to exchange the information described above. It is necessary to provide an identification means for transmitting a strong frequency radio wave, to make the timepiece having the identification tag close to the identification means, and to receive the high-frequency radio wave transmitted from the identification means sufficiently. The antenna provided inside is based on a bar antenna, and it is necessary to use a thin and flat rectangular antenna because it is necessary to make it as thin and large as possible in the watch. It is clearly different from the one that specified a specific relationship between the antenna part and the metal exterior part.
[0040]
Japanese Utility Model Laid-Open No. 57-131042 (Patent Document 9) describes a wristwatch provided with an antenna using a ring-shaped magnetic bar made of a C-shaped ferromagnetic material with a conductor portion 13 interposed therebetween. However, this known example relates to the antenna of a wristwatch with a radio, and the antenna is only disposed outside the wristwatch, and is not provided inside the metal exterior as in the present invention. It is clear that there is no.
[0041]
Furthermore, Japanese Patent Laid-Open No. 6-215842 (Patent Document 10) describes the content that the core of the inductor is formed of a separate member, but the subject is related to a chip inductor. The watch antennas like are obviously not only in the technical field, but also the purpose and technical structure are substantially different from this application.
[0042]
JP-A-11-74138 (Patent Document 11) describes a transformer in which a dust core is combined with a U-shaped member and an I-shaped member, and a secondary coil is wound around the U-shaped member. However, the object is to obtain a high-voltage transformer, and not only the technical field, but also the purpose and technical configuration of the present invention are substantially different from those of a wristwatch antenna like the present invention. It is a thing.
[0043]
Similarly, Japanese Utility Model Publication No. 61-203516 (Patent Document 12) discloses a structure in which the butt surface of the core is inclined from the perpendicular direction of the magnetic path, but the object is to obtain an inductance element. The watch antenna like the present invention clearly has a technical field, and the purpose and technical configuration are substantially different from those of the present application.
[0044]
Japanese Patent Laid-Open No. 2002-184737 ([Patent Document 13]) describes that the gap of the coil core is tapered or the area is changed. The watch antenna is obviously not only about the technical field, but also the purpose and the technical structure are substantially different from the present application.
[0045]
In addition, in the same known example, there is a description of the content that the core of the inductor is composed of a separate member, but it relates to a high voltage transformer and a chip inductor, and the watch antenna is clearly related to the technical field. In addition, the purpose and technical structure are also substantially different from the present application.
[0046]
That is, in the above-described conventional example, the output of the receiving antenna is based on the fact that it is extremely reduced when it is housed in a metal exterior, and the reduction in output is reduced by using a non-metal back cover material. The purpose is to use the metal side with high texture.
[0047]
However, in the above conventional example, there is a problem that the thickness of the timepiece is increased because glass or ceramics is used.
[0048]
Therefore, in the past, the use of a large-sized high-sensitivity antenna structure or use only in areas where the electric field strength of radio waves is strong may impair the convenience of radio clocks and design the design. In addition, the manufacturing cost of the antenna structure is inevitably high.
[0049]
However, in such a wristwatch, even if it is possible to ensure the arrival of radio waves to the antenna, it is as if the back cover is made of a metal material with a thin metallic plating. However, in terms of appearance, there is a problem that there is no feeling of weight or texture, and the image as a luxury product is impaired.
[0050]
Furthermore, since the receiving antenna is built in the metal side, the output of the antenna is lowered and the receiving performance is lowered.
[0051]
For this reason, in the past, a radio-controlled timepiece with a completely metallic exterior having a high-class feeling has not been realized.
[0052]
In order to solve such problems of the prior art, the applicant of the present application already described in Japanese Patent Application No. 2002-297095, if an antenna is placed inside a watch case having a metal side or a metal lid, Q As a result of lowering the value, the output from the antenna structure is lowered and the reception performance is remarkably lowered, and by making the antenna for solving the problem a special structure, A technical configuration has been proposed in which a decrease in the Q value of the antenna structure is suppressed as much as possible to prevent a decrease in the reception performance of the antenna.
[0053]
However, the above-described method for specifying the antenna structure has been found to have a limit in improving the reception performance of the antenna structure. It has been found that the above problem can be further improved by specifying the structure or characteristics of the metal exterior including the structure.
[0054]
Furthermore, the inventors of the present application, as a result of intensive studies, in the case where a metal object having conductivity is disposed in the vicinity of the antenna unit for receiving radio waves or in contact with the antenna unit in the past. Since the radio wave is absorbed by the metal object and the radio wave does not reach the antenna part, the resonance output of the antenna part is reduced, for example, the Q value was considered to be reduced, Even if the above-mentioned conventional grasp of the problem is actually an error and there is a metal object having conductivity near the antenna part or in contact with the antenna part, In the antenna unit, when the radio wave has substantially reached and is not resonant, the flow of magnetic flux due to the external radio wave entering the watch from the outside is somewhat attenuated (for example, about 3 dB). In effect Rather it is the fact that it reaches to the antenna unit was confirmed.
[0055]
The problem is that when the antenna unit resonates, the magnetic field lines (magnetic flux) coming out of the magnetic core of the antenna unit are drawn into the metal object, where eddy currents are generated and the magnetic energy is attenuated. It has been clarified that there is a problem in that reception is not normally performed due to a decrease in the output from.
[0056]
[Problems to be solved by the invention]
That is, the conventional radio wave correction wristwatch shown in FIG. 21 has no major problem with respect to the radio wave reception performance in portable use, but the wristwatch is dropped because the glass 23 is fixed to the edge frame 22 of the back cover 12. There is a problem that the glass 23 is broken when an impact is applied. Further, since the back cover 12 is in close contact with the arm, the glass 23 is detached from the edge frame 22 due to sweat or the like, or the movement inside the wristwatch (antenna 1, radio clock receiver 2, CPU 3, display) Sweat, water, dust, etc. may get into the drive unit 4 and the like, and the function as a wristwatch may be significantly reduced.
[0057]
Further, since the glass 23 is provided on the back cover 12, there is a problem that the number of parts increases and the number of assembling steps increases, leading to an increase in cost. In addition, since a non-metallic member is used for the exterior, it lacks a profound feeling as a wristwatch, and has a problem in luxury and appearance quality.
[0058]
The present invention has been made in view of the above-described problems of the prior art, and even when a normal metal case is used, it is possible to receive radio waves including predetermined information such as time information without any trouble on a mobile phone. Another object of the present invention is to provide an electronic device capable of improving the appearance quality having a stable waterproof quality and a high-class feeling and capable of expanding design variations similar to a general watch.
[0059]
Furthermore, the present invention solves the above-described conventional problems, and provides an electronic device having a metal exterior part with a built-in antenna part that has good radio wave reception performance and is not subject to material restrictions or design restrictions. It is for the purpose.
[0060]
Further, when the present invention is applied to a radio wave correction wristwatch which is one of the specific examples of the electronic device, in addition to the above-mentioned purpose, the thickness of the wristwatch is prevented from becoming bulky and the feeling of wearing on the arm is also good. The purpose is to provide a radio correction watch.
[0061]
[Means for Solving the Problems]
In order to achieve the above object, the present invention employs a basic technical configuration as shown below. That is, as a first aspect of the present invention, at least an antenna unit, an information processing device for processing information captured by the antenna unit, and the antenna unit and the information processing device are housed therein. The metal exterior part is capable of resonating by receiving magnetic flux from the outside of the metal exterior part via the metal exterior part. The electronic device is configured so that the electrical resistance value of at least a part of the metal exterior part is different from the electrical resistance value in other parts of the metal exterior part. As a second aspect of the present invention, at least an antenna unit, an information processing device for processing information captured by the antenna unit, and the antenna unit and the information processing device are provided. An electronic device configured with a metal exterior that can be housed inside, and the metal exterior receives the magnetic flux from the outside of the metal exterior via the metal exterior. The metal exterior part is composed of a body part (side part) and a back cover member, and the body part (side part) material and the back cover member are configured to resonate. However, the mutual peeling force between the body (side) material and the back cover member is 10 ^-4 This is an electronic device having N · m to 6.0 N · m.
[0062]
Further, as a third aspect according to the present invention, at least an antenna unit, an information processing device for processing information captured by the antenna unit, and the antenna unit and the information processing device are housed therein. The metal exterior part can resonate when the antenna part receives magnetic flux from the outside of the metal exterior part via the metal exterior part. The metal exterior part is composed of a body part (side part) and a back cover member, and the body part (side part) material and the back cover member are mutually screwed. The mutual loose torque between the body (side) material and the back cover member is 0.1 N · m to 6.0 N · m, preferably 0.2 N · m. This is an electronic device having m to 3.5 N · m.
[0063]
Further, according to a fourth aspect of the present invention, in the above-described configuration, at least a part of the mutual joint portions of the plurality of members constituting the metal exterior portion is electrically connected to the metal that constitutes the metal exterior portion. An electronic device in which an interposing member having an electric resistance value different from the resistance value is interposed, and as a fifth aspect according to the present invention, in the above-described configuration, at least the connecting portion is configured. In the electronic device, a part of the joint surface in one of the two metal members is removed, and a gap is formed between the joints.
[0064]
DETAILED DESCRIPTION OF THE INVENTION
Since the electronic device of the present invention employs the above-described technical configuration, a simple configuration without significantly changing the structure, material, design, etc. of a conventional watch, mobile phone, wireless communication device, etc. Using the antenna part, the reception performance is good, the size and thickness of the electronic device itself is not different from the conventional one, it has freedom of design, and the electronic device with a high-quality exterior is easy Is obtained.
[0065]
【Example】
Hereinafter, a configuration of a specific example of the antenna unit structure according to the present invention and a radio-controlled timepiece using the antenna unit structure will be described in detail with reference to the drawings.
[0066]
In other words, FIG. 1 is a cross-sectional view schematically showing the configuration of a specific example of the electronic device according to the present invention, in order to process at least the antenna unit 32 and information captured by the antenna unit 32 in the drawing. The information processing device 33, the antenna unit 32, and the metal exterior portion 31 that can house the information processing device 33 therein, and the metal exterior portion 31 Is configured such that the antenna unit 32 can receive magnetic flux from the outside of the metal exterior part 31 via the metal exterior part 31 and can resonate, and at least a part of the electric power of the metal exterior part 31 can be resonated. An electronic device 30 is shown which is configured such that its resistance value is different from the electrical resistance value in the other parts of the metal exterior part 31.
[0067]
The electronic device 30 in the present invention is preferably one selected from, for example, a watch, a mobile phone, and a wireless communication device.
[0068]
In FIG. 1, reference numeral 34 denotes arithmetic means for controlling the driving of the function of the electronic device 30, for example, a computer. Reference numeral 35 denotes a liquid crystal display for informing or displaying predetermined information subjected to arithmetic processing. Information display / notification means such as means or a speaker.
[0069]
Furthermore, in the present invention, the metal exterior part 31 is made of stainless steel, titanium, titanium alloy, gold, gold alloy, silver, silver alloy, copper, trunk alloy, brass, aluminum, aluminum alloy, zinc, zinc alloy. It is preferable that the antenna unit 32 is made of one or plural kinds of materials selected from magnesium, a magnesium alloy, and a cemented carbide (an alloy containing tungsten-carbide and tantalum-carbide). In such a situation, it is necessary to have a configuration that can suppress the generation of eddy currents generated in the metal exterior portion 31.
[0070]
In other words, as described above, what constitutes the basis of the technical idea of the present invention is that the antenna unit 32 provided in the metal exterior 31 has a lower reception performance than the conventional one. When resonating, the lines of magnetic force (magnetic flux) coming out of the magnetic core of the antenna unit are drawn into the metal object, where eddy currents are generated to attenuate the magnetic energy, resulting in a decrease in output from the antenna unit. Since it has been clarified that the reception is not normally performed, when the antenna unit 32 resonates, a configuration in which eddy current is not generated as much as possible in the metal exterior unit 31 is configured. It is in the point that it is necessary to introduce into the metal exterior part 31 of the electronic device 30.
[0071]
Therefore, as one realistic structure that realizes the technical idea of the present invention, a configuration that reduces the amount of magnetic flux that flows from the antenna portion 32 to the metal exterior portion 31 when the antenna portion 32 resonates. As one specific example, in at least a part of the metal exterior part 31, the electrical resistance value of the part is different from the electrical resistance value in other parts of the metal exterior part 31. It constitutes.
[0072]
More specifically, it is desirable that the electrical resistance value of a part of the metal exterior part is set to be larger than the electrical resistance values of other parts constituting the majority of the metal exterior part.
[0073]
Moreover, the said metal exterior part 31 in this invention may be an integral thing, Preferably, at least 2 metal members are joined and formed.
[0074]
In the latter case, it is desirable that the metal exterior part 31 is composed of, for example, a body member or a side member 45 and a back cover member 41. In this case, the body (side) material 45 is provided. It is preferable that the cover member 41 and the back cover member 41 are joined to each other at a predetermined portion and are fixed or detachable.
[0075]
On the other hand, in the metal exterior part 31 according to the present invention, the metal exterior part 31 is configured such that the body (side part) material 45 and the back cover member 41 are integrally formed. It is also desirable that the body member or side member 45 is composed of two or more sub-body members 451 and 452 as necessary, and the sub-body members 451 and 452 are joined to each other. It may be configured as shown.
[0076]
Similarly, in the present invention, the metal exterior portion 31 includes a body (side) material 45 and a back cover member 41 that are integrally formed, and the body member 45 is an inner body member. In some cases, the inner body member and the outer body member may be joined to each other.
[0077]
That is, the joint part 39 of the metal exterior part 31 in the electronic device 30 in the present invention is not limited to the joint part 39 described above, and the body member or the side member 45 of the metal exterior part 31. In this case, the operation processing mechanisms 33 and 34 disposed through the body member or the side member 45 such as the crown, the operation button, and the operation pin 46 and the through-hole portion 48 of the body member or the side member 45 are arranged. A joint portion with the inner surface is also included in the joint portion 39 in the present invention.
[0078]
In FIG. 1, reference numeral 47 denotes a switch circuit, for example.
[0079]
That is, when a part of the body member 45 is provided with at least one insertion member or contact member selected from a rod, a pipe, glass, a bezel, an inner register or a turn, these and the metal All the joints described above including the joint surface of the exterior part 31 with the body member or the side member 45 are candidate parts for changing the electrical resistance value in the present invention.
[0080]
Specifically, for example, among the plurality of members constituting the metal exterior part 31, the electrical resistance value of the metal constituting one member is different from the electrical resistance value of the metal constituting the other member. For example, in the joint portion 39 between the body member 45 and the back cover member 41, which is one of the desirable joint portions 39, the electrical resistance value of the body member 45 is the back cover. The electric resistance value of the member 41 is different from that of the member 41. For example, the electric resistance value of the back cover member 41 can be larger than the electric resistance value of the body member 45.
[0081]
In that case, it is also possible to make the metal material which comprises each member different.
[0082]
On the other hand, as another specific example in the present invention, the electrical resistance value of the mutual joint part 39 in the plurality of members constituting the metal exterior part 31 is the electrical resistance of the metal constituting the metal exterior part 31. It may be configured differently from the value.
[0083]
In such a specific example, the joint portion 39 may be provided with a gap portion or a space portion having an appropriate interval, or a metal member constituting the metal exterior portion 31 may be provided. It has a structure in which an insertion member 49 made of a material such as a film, a plate, or an adhesive formed of a material having an electrical resistance value larger than the electrical resistance value is inserted. Also good.
[0084]
The method for forming the joint portion 39 in the metal exterior portion 31 in the electronic device 30 in the present invention is to join the two metal members by an appropriate method, and the specific method is specified. For example, one or more types selected from a screw type, an internal screw type, a snap method, a welding method, a brazing method, a caulking method, a bayonet method, a solid phase diffusion bonding method, etc. used.
[0085]
In the present invention, it is desirable that the joint portion 39 be provided as close as possible to the antenna portion 32. In other words, the antenna portion 32 is disposed in the vicinity of the joint portion 39. It is desirable to do.
[0086]
Further, in the present invention, at least one joint portion 39 having the above-described characteristics is disposed in the metal exterior portion 31, but a plurality of joint portions 39 may be provided. Furthermore, it is also desirable to arrange the joint 39 so as to have a predetermined width, a predetermined length, and a predetermined area.
[0087]
Next, FIG. 2 shows a schematic cross-sectional view of a configuration example when the present invention is applied to a radio-controlled timepiece 30 that is a specific example of the electronic device 30.
[0088]
That is, in FIG. 2, the metal exterior part 31 is comprised from the trunk | drum member 45 and the back cover member 41, Comprising: The said trunk | drum member 45 comprises a substantially cylindrical shape, The FIG. The windshield glass 43 is attached to the step 37a at the inner peripheral edge of the upper opening through the packing 44, and the back cover member 41 is press-fitted, screwed, screwed, etc. into the lower opening in FIG. A predetermined joint 39 is formed by joining the peripheral edge of the body member 45 and the peripheral edge of the back cover member 41 to each other.
[0089]
The back cover member 41 shown in FIG. 2 is attached to the body member 45 by a screw type, and the packing 44 is sandwiched between the rising portion 50 and the inner side surface 37 c of the body member 45.
[0090]
Further, in the body member 45, a movement 42 including the above-described radio timepiece receiver 2, the CPU 3, the display driving unit 4 and the like shown in FIGS.
[0091]
Above the movement 42 in FIG. 2, a dial plate 35 and a pointer 36 are provided as a time display unit. The movement 42 is positioned by the dial plate 35 coming into contact with the lower surface in the drawing of the inward projecting portion 37 b forming the stepped portion 37 a of the metal exterior portion 31, and is disposed on the upper surface of the rising portion 50 of the back cover member 41. It is fixed by being sandwiched between the body member 45 made.
[0092]
A predetermined space 51 is provided between the movement 42 and the back cover member 41, and the antenna unit 32 is disposed in the space 51. The antenna portion 32 is composed of a rod-shaped magnetic core material 38 and a coil 40 wound around the magnetic core material 38, and is fixed to the lower surface of the movement 42.
[0093]
In this embodiment, the body member 45 and the back cover member 41 are both made of titanium. In the specific example of the present invention, the thickness of the body member 45 is set to 1600 μm, and the distance from the antenna portion 32 to the inner surface of the body member 45 is set to 2000 μm. Further, the thickness of the back cover member 41 is set to 800 μm, and the distance from the antenna portion 32 to the inner surface of the back cover member 41 is set to 3000 μm.
[0094]
In the radio-controlled timepiece having the above-described configuration, the CPU (not shown) in the movement 42 operates the display driving unit (not shown) based on the standard radio wave received by the antenna unit 32, and the pointer 36 is moved. Drive to always correct. At this time, in this specific example, the body member 45 and the back cover member 41 are made of metal, but the body member thickness, the back cover member thickness, and the distance between the antenna and the body member and the back cover member are received. Since it is set to a desirable value predetermined in an experiment for optimizing the sensitivity, the disturbance of the resonance phenomenon near the antenna is reduced and the reception sensitivity is improved.
[0095]
In addition, gold, a gold alloy, silver, a silver alloy, copper, a trunk alloy, brass, aluminum, an aluminum alloy is formed on the inner surface of the back cover member 41 of the metal exterior portion 31 or the inner surface of the barrel member 45 in the specific example. When a nonmagnetic member having an electrical resistivity of 7.0 μΩ · cm or less, such as zinc, zinc alloy, magnesium, or magnesium alloy, is attached, the gain can be improved by about 2 to 3 dB.
[0096]
Hereinafter, the case where the insertion member 49 is interposed in the joint portion 39 according to the present invention will be described in detail.
[0097]
That is, in one specific example of the electronic device 30 according to the present invention, a plurality of members constituting the metal exterior portion 31, for example, between the body member 45 and the back cover member 41. At least a part of the mutual joint portion 39, for example, the joint portion 39 formed at a position closest to the antenna portion 32 has an electric resistance value different from the electric resistance value of the metal constituting the metal exterior portion 31. The interposing member 49 is interposed.
[0098]
In this case, it is desirable that a plurality of members constituting the metal exterior portion 31, for example, the metal materials constituting both the body member 45 and the back cover member 41 are the same, but different cases. It doesn't matter.
[0099]
In this specific example, the electrical resistance value of the material constituting the interposition member 49 inserted between the joint portions 39 is the same as that of all the metal members constituting the metal exterior portion 31. It is desirable to select such that it is higher than the electric resistance value.
[0100]
Although the material of the said insertion member 49 is not specifically limited, It is desirable to be comprised with the substance which has insulation substantially.
[0101]
As shown in FIGS. 2 and 3, the joint 39 has a structure in which the interposer 49, which is an insulator, is interposed via the packing member 44 in the joint 39 of the same part. It may be.
[0102]
Further, when the arrangement position of the joint portion 39 of the specific example in the present invention is viewed in plan, the mutual joint portion 39 between the body member 45 and the back cover member 41 is usually circular, elliptical, or rectangular. Therefore, it is desirable that the interposition member 49 is disposed along the entire circumference of the joint portion 39.
[0103]
Of course, in the present invention, when the electronic device 30 has a structure that ensures waterproofness, the insertion member 49 is a part of the periphery of the joint portion 39, for example, the It is also possible to provide it only at a part close to the arrangement position of the antenna part 32.
[0104]
Accordingly, the insertion member 49 in the present invention is fixedly disposed between the joint portions 39.
[0105]
Further, the intervening portion of the insertion member 49 in the present invention is not limited to the above specific example, and can be realized in all the joint portions 39 as described above. The interposing member 49 can also be arranged at the joint formed at the fitting portion with the bezel, the upper body and the lower body, or the joint between the inner body and the outer body.
[0106]
The insertion member 49 used in the present invention is preferably a member formed separately from any one or a plurality of members constituting the metal exterior portion 31, for example, synthetic resin Also, it may be a film or film made of rubber (organic material), or a thin film member having an insulator such as an oxide or an oxide film, and ink, paint, adhesive, or paste may be used. Is possible.
[0107]
Further, the interposition member 49 used in the present invention is at least one member of one or a plurality of members constituting the metal exterior portion 31, and at least the member that contacts the joint portion 39. It may be a film body formed in the above.
[0108]
That is, the film body may be formed by performing appropriate surface treatment and / or curing treatment on one or at least a part of the members constituting the metal exterior portion 31.
[0109]
The surface treatment may be, for example, one method selected from a wet plating method, a dry plating method, and a heat treatment.
[0110]
It is desirable that the electrical resistance value of the interposing member used in the present invention is larger than the electrical resistance values of a plurality of members constituting the metal exterior member.
[0111]
If the effect by the above-mentioned this invention is demonstrated, in the conventional structure as mentioned above, the metal exterior part 31 of the electronic device 30 is circular as shown in FIG. As shown in FIG. 4B, the metal exterior part 31 is composed of a body member 45 and a back cover member 41, both of which are fitted and fixed to each other by a screw part 52. A joint portion 39 according to the present invention is formed by the joint surface S2 of the mutual fitting surface S1, the body member 45, and the back cover member 41.
[0112]
Therefore, the joint 39 formed by the joint surface S2 between the trunk member 45 and the back cover member 41 is formed in an annular shape as shown in FIG. Considering an example in which the antenna unit 32 is arranged close to a part of the joint part 39, as shown in FIG. 4B, in a state where the antenna part 32 is resonating, the magnetic core part 38 of the antenna part 32 Eddy currents 54 due to magnetic flux generated from both ends are indicated by arrows A, B, C. ₀ In FIG. 3, an insulating member is interposed between the back cover member 41 and the body member 45 that are in contact with each other via the rubber packing 44. Since the interposing member 49 is interposed, the eddy current C shown in FIG. ₀ Therefore, the total amount of eddy current is reduced and energy loss is reduced.
[0113]
Next, in another specific example of the electronic device 30 according to the present invention, a plurality of members constituting the metal exterior portion 31, for example, the body member 45 and the back cover member 41. A configuration in which a non-joined part is formed in at least a part of the mutual joint part 39 between them, for example, at least a part of the joint part 39 formed in the part closest to the antenna part 32 is adopted. is there.
[0114]
That is, in this specific example, in order to give the joint portion 39 an electric resistance value higher than the electric resistance value of the metal material constituting the metal exterior portion 31, In addition, a gap portion 55 through which air is interposed is formed.
In the specific example of the present invention, the gap portion 55 removes a part of the joint surface in at least one metal member of at least two metal members constituting the joint portion 39. In addition, a gap 55 is formed between the joints 39.
[0115]
In the present invention, the gap 55 is formed by deleting an appropriate width, length, or thickness from one side of the joint surfaces of the two opposing metal members forming the joint 39. Thus, the non-contact state portion is formed.
[0116]
Alternatively, the gap portion 55 may be formed by deleting a part of the insertion member 49 in the specific example described above.
[0117]
The height of the gap portion 55 used in the specific example of the present invention or the gap width is preferably 0.1 to 1000 μm, and more preferably 60 to 160 μm.
[0118]
For example, as shown in FIG. 6A, the gap portion 55 is formed by removing a part of the contact portion 39 between the back cover member 41 and the body member 45 constituting the metal exterior portion 31. In the specific example of FIG. 6 (A), only the back cover member 41 is partially removed to form the gap portion 55. As shown in FIG. 6 (B), which is a plan view thereof. In addition, the gap portion 55 is formed by forming a non-contact portion of the joint portion 39 on a part 56 of the joint surface of the joint portion 39 formed in an annular shape.
[0119]
As shown in FIG. 6B, it is desirable that the gap portion 55 is provided in the vicinity of the antenna portion 32.
[0120]
Further, in another specific example of the present invention, in the metal exterior part 31, for example, the body (side part) material 45 and the back cover member 41 constituting the metal exterior part 31, As shown in FIG. 4B, when the screw mechanisms 52 are joined to each other, and the mutual screw surfaces form a joint portion 39, a part of the screw mechanism 52 is deleted and the gap is removed. The part 55 may be formed.
[0121]
That is, as shown in FIG. 7A, a gap 55 is formed by deleting a part of the screw mechanism 52 of at least one of the screw mechanisms 52 of the joint 39 constituted by the screw mechanism. May be.
[0122]
In this specific example, as shown in FIG. 7B, it is desirable that the gap portion 55 be provided in the vicinity of the antenna portion 32.
[0123]
That is, in the specific example of FIG. 7A, a part of the screw mechanism 52 of the trunk member 45 is cut off and engaged with the screw mechanism on the back cover member 41 side and the side surface of the trunk member 45. A configuration in which a gap 55 is formed between the two is shown.
[0124]
As shown in FIG. 7B, the gap portion 55 has a body member 45 on a part 56 of the joining surface 39 of the joining portion 39 in which the joining surface by the screw mechanism is formed in an annular shape. A part of the screw mechanism 52 is cut out to form a non-contact portion of the joint portion 39.
[0125]
Moreover, the specific example of FIG. 7 shows an example of a configuration in which the above-described interposing member 49 and the gap portion 55 are used together.
[0126]
In the specific example in which the gap portion 55 is used, the space portion of the gap portion 55 is filled with air, so that an insulating effect can be exerted. The same effect as when the member 49 is inserted can be exhibited.
[0127]
In this specific example, the above-described insulator can be inserted into the internal space of the gap portion 55.
[0128]
The gap portion 55 is not limited to the portion shown in FIG. 7, and as described above, at least two metal material members formed in the metal exterior portion 31 are joined in some form. It goes without saying that it can be applied to any of the parts.
[0129]
In order to verify this fact, the experimental results shown in FIG. 31 are presented.
[0130]
In the experiment of FIG. 31, when the gap portion 55 is not formed in the joint portion 39 between the back cover member 41 and the body member 45 in the annular metal exterior portion 31 (Experiment 1: cut). In the case where the gap portion 55 is provided in the vicinity of the antenna portion in the joint portion 39 (Experiment 2) and on the side opposite to the antenna portion in the joint portion 39 In the case where the gap portion 55 is provided in the portion (Experiment 3), two types of frequencies were selected for each, and antenna characteristic values were measured.
[0131]
Judging from the experimental results of FIG. 31, there is no significant difference in the antenna characteristics depending on the position where the gap 55 is provided, but the gain is more effective than that of a structure without any cut, that is, without the gap 55. There is something to understand.
[0132]
Next, the interposition member 49 and / or the gap portion 55 arranged in the metal exterior portion 31 of the electronic device 30 according to the present invention described above and the arrangement position of the gap portion 55 or both are disposed in the metal exterior portion 31. A specific example of the positional relationship with the antenna unit 32 will be described in detail.
[0133]
First, the structure of the antenna portion 32 used in the present invention is not particularly limited, but preferably, the antenna portion is the metal exterior portion 31 as shown in FIGS. It is desirable to have a magnetic core around which a coil made of a linear or curved rod-like body having a maximum longitudinal length shorter than the maximum diameter portion length is wound.
[0134]
Of course, in the present invention, the magnetic core may be formed in an annular shape or a closed loop shape. For example, the antenna portion 32 having the configuration shown in FIG. 14 may be used. Is possible.
[0135]
In the present invention, as described above, as shown in FIGS. 4 to 7, the antenna portion 32 is located near the outer peripheral edge of the metal exterior portion 31, specifically, the joint portion 39. It is preferable to arrange in the vicinity.
[0136]
On the other hand, when the antenna portion 32 is disposed inside the metal exterior portion, basically, the antenna portion 32 is disposed at any location in the vicinity of the outer peripheral edge portion 39 in the metal exterior portion. Anything can be used.
[0137]
On the other hand, in order to maximize the purpose of the present invention, as described in each of the above specific examples, the antenna portion 32 is located at a portion where the interposition member 49 or the gap portion 55 is disposed. It is desirable that it is arranged in the vicinity.
[0138]
More specifically, the insertion member 49 or the gap portion 55 of the metal exterior portion 31 includes both end portions of the magnetic core portion of the antenna portion 32 having a predetermined length and the center portion of the metal exterior portion 31. The joint portion 56 included in the fan-shaped region 57 is formed continuously as shown in FIG. 6 or intermittently as shown at 60 in FIG. The antenna portion 32 is provided in the vicinity of the portion where the interposition member 49 or the gap portion 55 is disposed.
[0139]
The length of the sector region 57 in the present invention is determined by the magnetic core length A of the antenna unit 32 and the arrangement position of the antenna unit 32. Therefore, the arrangement position of the antenna unit 32 is It is desirable to dispose within the range represented by the ratio (B / A) of the angle between the magnetic core length A of the antenna part 32 and the joint part 39.
[0140]
FIG. 32 (A) shows an example in which the antenna part 32 is arranged inside the metal exterior part 31, and FIG. 32 (B) shows the antenna having a predetermined length A. The length of the gap portion 55 when the antenna portion 32 is moved from the center portion of the metal exterior portion 31 along the direction of the gap portion 55, that is, the length B of the fan-shaped region 57 and the angle at that time FIG. 32C shows an example of the ratio of the length B of the fan-shaped region 57 to the length A of the antenna section 32.
[0141]
That is, when it is desirable that the central angle range in the fan-shaped region when the contact point is not provided in the sector-shaped region is 30 to 180 degrees, the ratio (B / A) of the angle is 0.64 to 2 .5, and it is desirable that the central angle range of the fan-shaped region be 50 to 120 degrees under the same conditions, the ratio (B / A) of the angle is 1.05 to 1.05. It is understood that 2.16 is necessary.
[0142]
Furthermore, when a contact point is not provided in the sector area when the central angle in the sector area is 10 degrees or less, the ratio (B / A) of the angles needs to be 0.21 or less. Things are understood.
[0143]
Accordingly, it is possible to estimate a preferable arrangement position of the antenna unit 32 having a predetermined length by combining the data in FIG. 32C and the information on the preferable angle range shown in FIG. 5B.
[0144]
The angle range of the sector region 57 in the present invention is 30 to 180 degrees, preferably 50 to 120 degrees, more preferably 60 to 90 degrees.
[0145]
Here, in order to examine the preferable range of the central angle of the sector region 57 in the present invention, the inventors of the present application made a specific example of the present invention as shown in FIG. The change state of the antenna gain (dB) when the center angle (θ) of the fan-shaped region 57 for cutting off the thread portion as shown in FIG. 5A is measured, and the result is shown in FIG. It was.
[0146]
As is apparent from the graph of FIG. 5B, the gain (dB) of the antenna portion 32 increases as the angle of the cut-out region of the joint portion 39 in the screw portion increases. Although it can be understood that the effect of the present invention can be obtained in the angle range, it is understood that it is preferably 30 to 90 degrees, more preferably 60 to 90 degrees.
[0147]
Further, in one specific example of the present invention shown in FIG. 8 (A), a part of the fan-shaped region 57 is, for example, 10 degrees by 5 degrees to the left and right from the center line of the fan-shaped area 57. The antenna portion 32 of the antenna portion 32 when the screw portion remains without cutting the screw portion within the angle range or the joint portion 39 is left without inserting the insertion member 49. The characteristics and the case where all the joints 39 within the central angle of 120 degrees are removed are viewed in comparison with the conventional structure, that is, the case where all the joints are not provided with a cut portion or the insertion member 49 is not inserted. In the latter configuration, there is a considerable effect compared to the conventional configuration, but in the former configuration, there is a slight effect compared to the conventional configuration, but the effect compared to the latter configuration. Although there are few, there are practical effects.
[0148]
In the present invention, as described above, the antenna section 32 may be disposed at a position not corresponding to the above-described fan-shaped region 57.
[0149]
Next, a preferred configuration of the antenna unit 32 used in the present invention will be described below.
[0150]
That is, the antenna unit 32 used in the present invention is basically a bar antenna and has a characteristic that the L value of the antenna is 1600 mH or less, or the winding resistance of the antenna is The antenna section is preferably 1 KΩ or less, and more preferably the antenna section has 1000 or more windings.
[0151]
Hereinafter, the configuration of a preferred specific example of the antenna structure according to the present invention will be described in detail with reference to the drawings.
[0152]
That is, FIG. 9 is a schematic plan view showing a specific example of the antenna part 32 according to the present invention. In the figure, at least both the side part 45 and the back cover part 41 are made of metal. An antenna unit 32 that can receive the arranged radio wave is shown.
[0153]
By the way, in the above-mentioned conventional example, when the antenna part is inserted and arranged in a metal exterior part such as a metal side or a lid, a resonance phenomenon (magnetic force → power → magnetic force →... ) Is hindered by the metal exterior, that is, the magnetic force generated by the resonance phenomenon is attracted to the metal part, causing the eddy current phenomenon and consuming most of the magnetic force (iron loss) (Depending on the influence), the gain and Q value of the antenna portion are greatly reduced, and there is a problem in practical use of the radio-controlled timepiece in which the antenna portion is disposed in the metal exterior.
[0154]
On the other hand, in general, in an antenna unit, the gain increases as the number of windings increases. However, at a certain number of windings, the winding resistance (copper loss) increases and the gain decreases. I understand.
[0155]
In other words, the output of the antenna unit is composed of the output according to Faraday's law and the output generated by the resonance phenomenon of the antenna unit. Has also decreased significantly.
[0156]
In other words, normally, when a metal object is not present in the vicinity, most of the gain of the antenna unit is mostly obtained by the resonance phenomenon described above, and the winding resistance (copper loss) of the antenna unit increases. Then, the resonance phenomenon is hindered and the gain (Q value) is lowered, so that the number of windings cannot be increased extremely or the windings cannot be thinned.
[0157]
On the other hand, when the antenna unit is placed in a metal exterior, the influence of iron loss (metal exterior) is large, so the Q value is greatly reduced and the gain is also greatly reduced.
[0158]
For this reason, the inventor of the present application has changed the conventional concept, and when using the antenna part in a metal exterior, the antenna part is based on the premise that a decrease in the Q value is inevitable. Has been intensively studied on how to improve the gain.
[0159]
That is, in the present invention, when the antenna part is inserted and disposed in the metal exterior part, the gain obtained by Faraday's law is obtained instead of obtaining the gain by the amplification factor by the Q value (resonance phenomenon) as in the prior art. As a result of pursuing how to maximize the use of the system, it is based on the technical idea acquired.
[0160]
In order to confirm the above technical idea, the inventors of the present application first conducted an experiment for measuring the relationship between the L value (mH) of a predetermined antenna unit and the gain (dB) of the antenna unit as shown in FIG. Went.
[0161]
That is, in FIG. 10, the relationship between the L value and gain (dB) when receiving a radio wave of 77.5 KHz without inserting a predetermined antenna part into the metal exterior part is shown in graph A. Graph B shows the relationship between the L value and gain (dB) when receiving a radio wave of 77.5 KHz with the antenna portion of the structure inserted in the metal exterior portion.
[0162]
In this experiment, a winding was wound around a normal linear core portion by a normal method, and the change in L value was adjusted by changing the number of windings, changing the winding resistance, or the like.
[0163]
As can be seen from FIG. 10, in the antenna portion not inserted into the metal sheath, the gain increases as the L value increases, but gradually saturates when the L value exceeds about 10 mH. It can be seen that the antenna part inserted in the metal sheath does not have the saturation phenomenon as described above, and the gain increases linearly in proportion to the increase of the L value.
[0164]
That is, from the above experimental results, it is shown that when the antenna part is put in a metal sheath, the gain decrease due to the resonance phenomenon is remarkable, but the attenuation level of the gain according to Faraday's law is very small. Yes.
[0165]
As a result of further investigation, the present inventors have found that the antenna portion 32 used in the metal exterior portion has a linear improvement in gain as the L value increases. It is judged that it is desirable to increase the L value by increasing the number of turns.
[0166]
However, when the number of turns of the antenna unit is increased, the capacity of the antenna unit itself is increased, so that there is a restriction on the resonance point of the antenna unit, so the upper limit is inevitably determined.
[0167]
Therefore, the present inventors consider that the winding capacity of the antenna section is normally about 10 pF, and the frequency band used is the lowest, 40 KHz. When the L value of the antenna unit 32 is obtained from the formula f = 1 / 2π√LC, it is about 1584 to 1600 mH. Therefore, it was determined that it is desirable to use the L value of 1600 mH or less.
[0168]
Actually, if the parasitic capacitance of the mounting substrate and the receiving IC is included in addition to the winding capacitance of the antenna unit, the parasitic is considered to be about 20 pF. In this situation, the L value is 792 to 800. Therefore, it is desirable to use the antenna unit 32 whose L value is 800 mH or less.
[0169]
Furthermore, in practical terms, the highest frequency band that currently exists is 77.5 KHz (Germany), and if it is determined on the assumption that this frequency band will be used, it will be under that situation. When the L value of the antenna unit 32 is obtained based on the capacity and frequency, it is about 211 to 220 mH, and it is desirable to use the antenna unit 32 having the L value of 220 mH or less.
[0170]
The lower limit value of the L value in the antenna section 32 in the present invention is preferably about 20 mH.
[0171]
This is because the minimum output required for the antenna unit differs depending on the capability of the receiving IC, but when the minimum output required for the antenna unit is 50 dB, the lower limit of the L value is 25 mH from FIG. When the output is 51 dB, the lower limit of the L value is 20 mH from FIG. 10, and when the minimum output required for the antenna unit is 52 dB, the lower limit of the L value is preferably 15 mH from FIG.
[0172]
The L value determined to be preferable in the present invention described above is an extremely unique value considering that the L value of the antenna portion in the conventional radio-controlled timepiece is 2 to 13 mH at most. Is understood.
[0173]
Next, the inventors examined the relationship between the number of windings (T) and the gain (dB) of the windings in the antenna unit, and the results are shown in FIG.
[0174]
That is, in FIG. 11, as in the experiment of FIG. 10, the number of windings of the antenna unit 32 when receiving a radio wave of 77.5 KHz without inserting the predetermined antenna unit into the metal exterior unit ( The relationship between T) and gain (dB) is shown in graph C, and the number of windings (T) and gain (7) when receiving an electric wave of 77.5 KHz with the antenna part having the same structure inserted in the metal exterior part. The relationship with dB) is shown in graph D.
[0175]
As can be seen from FIG. 11, in the antenna part not inserted in the metal sheath, the gain increases as the number of windings (T) increases, but the number of windings (T) becomes 1000. When it exceeds, the antenna gradually saturates, but the antenna part inserted in the metal sheath does not have the saturation phenomenon as described above, and the gain increases linearly in proportion to the increase in the number of windings (T). .
[0176]
Therefore, in the present invention, in the radio wave correction timepiece in which at least one of the side part or the lid part of the exterior part is a metal or the radio wave correction timepiece in which the side part and the cover part of the exterior part are metal, the antenna part It is determined that the number of windings (T) of 32 is desirably 1000 T or more.
[0177]
Furthermore, as understood from FIG. 11, when the antenna unit 32 is used alone without being placed in the metal exterior, the number of windings (T) is 1500 or more and the gain increase rate is saturated. However, when the antenna part 32 is arranged in the metal exterior, it indicates that the gain increases linearly even if the number of windings (T) is 1500 or more. In a radio-controlled timepiece in which at least one of the lids is made of metal, it is determined that it is more effective that the number of windings (T) of the antenna unit 32 is 1500 or more.
[0178]
On the other hand, as the number of windings (T) of the antenna unit increases, the resistance value of the antenna unit increases, so the upper limit of the number of windings (T) is also limited.
[0179]
Therefore, the inventors of the present application do not consider the case where the winding resistance (Ω) and gain of the antenna portion 32 and the winding resistance (Ω) and the antenna portion are close to the metal exterior as shown in FIG. Experiments were conducted to examine the relationship between the gain difference and the case.
[0180]
That is, in FIG. 12, similarly to the experiment of FIG. 10, the winding resistance of the antenna section 32 when receiving a radio wave of 77.5 KHz without inserting the predetermined antenna section into the metal exterior section ( The relationship between (Ω) and gain (dB) is shown in graph E, and the winding resistance (Ω) and gain (when the radio wave of 77.5 kHz is received with the antenna part having the same structure inserted in the metal exterior part) The relationship with dB) is shown in graph F.
[0181]
Also, a graph showing the relationship between the winding resistance (Ω) and gain of the antenna unit 32 and the gain difference between the case where the antenna unit is placed close to the metal exterior and the case where the antenna unit is not close to the metal exterior. G.
[0182]
In the experiment shown in FIG. 12, the winding resistance (Ω) value was adjusted by appropriately changing the resistance value as shown in FIG.
[0183]
As understood from FIG. 12 (A), the winding is used in both cases where the antenna unit 32 without the metal exterior is used alone or when the antenna unit 32 is disposed in the metal exterior. It has been shown that gain decreases with increasing resistance (Ω).
[0184]
When looking at a graph G showing a gain difference between the graphs E and F, when the value of the winding resistance (Ω) is 1 KΩ or more, the antenna portion 32 is not used with a metal exterior. It can be understood that there is no change in the gain difference when used inside the metal exterior, and the gain difference is constant around 3 to 4 dB.
[0185]
This is because, in the conventional case, in the vicinity of an antenna unit for receiving radio waves, or when a conductive metal object is placed in contact with the antenna unit, the radio wave is absorbed by the metal object. Since the radio wave does not reach the antenna unit, the resonance output of the antenna unit is reduced.For example, the Q value was considered to decrease, but as a result of intensive studies by the inventors, Even if the above-mentioned conventional grasp of the problem is actually an error and there is a conductive metal object in the vicinity of the antenna part or in contact therewith, In the antenna unit, when the radio wave reaches substantially and is not resonant, the flow of magnetic flux due to the external radio wave entering the watch from the outside is somewhat attenuated (for example, about 3 dB). )Substantially, Although the fact that the harm without reaching to the antenna portion can be confirmed, consistent with this fact.
[0186]
The problem is that when the antenna unit resonates, the magnetic field lines (magnetic flux) coming out of the magnetic core of the antenna unit are drawn into the metal object, where eddy currents are generated and the magnetic energy is attenuated. It has been clarified that there is a problem in that reception is not normally performed due to a decrease in the output from.
[0187]
The above problem will be described in more detail. For example, in FIG. 4, the metal exterior portion 31 of the timepiece 30, that is, the back cover member is formed of a metal material, and the radio wave receiving antenna portion 32 is When the radio wave J is arranged in the metal exterior part 31 to receive radio waves, the flow of the magnetic flux J due to the external radio waves entering the watch 30 from the outside is somewhat attenuated (for example, about 3 dB). Specifically, the antenna unit 32 reaches the antenna unit 32 without any obstacle, but when the antenna unit 32 resonates by receiving a magnetic flux, that is, energy state conversion is alternately performed between electric energy and magnetic energy. The flow of resonance magnetic flux A, B, C output from the end of the magnetic core 38 in the antenna unit 32 ₀ Is drawn into the metal exterior portion 31 that is the metal material, where an eddy current is generated and the energy of the flow 7 of the resonance magnetic flux is absorbed. As a result, the resonance output from the antenna portion 32 is generated. It has been found that it decreases.
[0188]
That is, when the output characteristic value of the antenna unit 32 is defined by a Q value, the Q value indicates the ratio of output to the input to the antenna unit 32, and Q value = 100 is output for the input 1 Indicates an output characteristic of 100, and it is determined that the higher the Q value, the better the antenna unit.
[0189]
That is, the higher the Q value is, the better the performance as an antenna unit is. In other words, it is also an index indicating the magnitude of the energy loss.
[0190]
As a specific example of the Q value measurement method, for example, the method described in the specification of Japanese Patent Application No. 2002-264985 filed by the applicant of the present application can be used.
[0191]
From the above results, if the value of the winding resistance (Ω) is 1 KΩ or less, the contribution of the effect to the gain of the antenna unit 32 used in the metal sheath is the gain when the antenna unit 32 is not used in the metal sheath. Therefore, the winding resistance (Ω) of the antenna unit 32 in the present invention is desirably 1 KΩ or less.
[0192]
In general, the thickness of the watch is considered to be about 10 mm, the winding width of the antenna portion is 20 mm, the winding core thickness is 1 mm, the winding thickness is the conductor diameter 60 μm, the conductor diameter 65 μm, and the winding resistance is 1 KΩ. In this case, the limit of the number of windings is 25000T.
[0193]
More specifically, the number of windings of the data in FIG. 10 is replaced with the winding resistance value of the sample, and the predetermined antenna portion 32 is inserted into the metal exterior as shown in FIG. 13 combined with the data in FIG. Graph H shows the relationship between the winding resistance (Ω) and gain (dB) of the antenna unit 32 when receiving a 77.5 KHz radio wave, and the antenna unit with the same structure is inserted into the metal exterior. Graph I shows the relationship between the winding resistance (Ω) and the gain (dB) when receiving a 77.5 KHz radio wave.
[0194]
The graphs H and I are substantially the same as the graph E and the graph F in FIG.
[0195]
On the other hand, a graph J in FIG. 13 shows an antenna portion having the same structure as described above, in the case where the number of turns (T) is changed to 1000 to 2000 T, and in a state where it is inserted into the metal exterior portion. The relationship between the winding resistance (Ω) and the gain (dB) when receiving the radio wave is shown, and it shows that the gain is improved when the winding resistance (the number of windings) is increased.
[0196]
Graph K is an approximate curve of graph J.
[0197]
On the other hand, the graph M increases as the winding resistance J increases as the winding resistance (Ω) increases as the winding resistance (Ω) increases, and the winding resistance J increases as the number of windings (T) increases. It is a graph which shows the balance with the gain to do.
[0198]
As is apparent from the graph M in FIG. 13, it can be understood that the balance between the increase and decrease in the gain is saturated as the winding resistance (Ω) becomes higher than around 396 Ω. It turns out that the effect is not obtained even if the winding is performed so that the wire resistance (Ω) is 400Ω or more.
[0199]
Therefore, the winding resistance (Ω) of the antenna unit 32 in the present invention is desirably 400Ω or less.
[0200]
Further, in the present invention, when a metal sheath is used, it is considered that the most efficient method is to use the antenna portion 32 in a region where the gain of the antenna portion 32 is high and the change is small. As understood from the graph F in FIG. 12, it is considered desirable to use the antenna unit 32 in a state where the winding resistance (Ω) is 100Ω or less.
[0201]
The lower limit value of the winding resistance (Ω) in the antenna section 32 in the present invention is preferably about 18Ω.
[0202]
That is, assuming that the minimum output required of the antenna unit is −51 dB, the number of windings is 1400 T from FIG. 11, and this is a winding with a typical conductor diameter of 100 μm and a conductor diameter of 110 μm. Is wound around an antenna with a winding core thickness of 1 mm, the winding resistance is about 18Ω, and when the winding diameter is 80 μm and the conductor diameter is 85 μm, the winding resistance is about 22Ω. When the winding has a thickness of 65 μm and a conductor diameter of 70 μm, the winding resistance is about 30Ω, and when the winding has a conductor diameter of 60 μm and a conductor diameter of 65 μm, the winding resistance is about 38Ω. Is considered the limit.
[0203]
Incidentally, the winding resistance (Ω) of the antenna portion in the conventional radio wave correction watch is about 20Ω at most, and the winding resistance (Ω) in the present invention is significantly higher than the conventional level. A resistor (Ω) is used.
[0204]
From the above experimental results, in the present invention, when the antenna portion 32 is arranged in the metal exterior portion, the Q value is not lowered even if the winding resistance (copper loss) of the antenna portion is increased. In other words, even if the wire diameter is thin, if the number of turns is the same, the change in the Q value and the gain G is small.
[0205]
On the other hand, the gain of the antenna section of the antenna section 32 is improved by increasing the number of turns.
[0206]
As a result, when the antenna portion is arranged in the metal exterior, it is possible to improve the gain by designing the winding to be thin and increase the number of turns.
[0207]
Further, in the conventional mode in which the antenna portion 32 is not inserted into the metal exterior portion, when the winding diameter is large, for example, a winding having a low resistance value with a winding diameter of 0.1 mmφ is used. If it has a thin winding diameter, for example, it shows better gain characteristics than using a winding showing a high resistance value with a winding diameter of 0.06 mmφ, but in the present invention, When the antenna part 32 is arranged in the metal exterior part, there is no difference in gain characteristics.
[0208]
Therefore, in the present invention, it is desirable to form the antenna portion 32 by using a thin winding, so that the antenna portion 32 having a smaller size can be formed.
[0209]
Therefore, as another aspect of the antenna portion in the present invention, the winding preferably has a wire diameter of 0.1 mmφ or less, preferably 0.06 mmφ.
[0210]
The antenna unit 32 according to the present invention is basically based on a shape in which the winding is wound around a normal linear antenna unit core unit by a predetermined number of windings (T). The configuration is not limited to this, and an antenna unit having any form can be applied. In particular, the antenna unit disclosed in Japanese Patent Application No. 2002-297095 filed earlier by the applicant of the present application. It is also possible to apply to this configuration.
[0211]
In addition, the structural relationship between the antenna portion 32 and the metal exterior portion 31 in the present invention and the arrangement relationship of both are also important factors in the present invention.
[0212]
Therefore, preferable conditions will be described in detail below with respect to the structural relationship between the antenna portion 32 and the metal exterior portion 31 in the present invention and the positional relationship between the two.
[0213]
That is, in the electronic device 30 according to the present invention, the antenna portion 32 and the metal exterior portion 31 built in the metal exterior portion 31 are the body member thickness of the metal exterior portion, that is, the body member. It is desirable to set the thickness of 45 or the thickness of the back cover member 41 which is the thickness of the back cover member 41 and the distance from the antenna portion to the body member 45 or the back cover member 41 based on the reception sensitivity.
[0214]
Thus, when the thickness of the body member or the back cover member and the distance from the antenna to the body member 45 or the back cover member 41 are set based on the reception sensitivity, disturbance of the resonance phenomenon in the vicinity of the antenna caused by the metal material is reduced. Therefore, even if it is the metal exterior part 31, it becomes possible to improve receiving sensitivity. This makes it possible to use titanium, stainless steel, etc. for the body member, back cover member, bezel, etc. even in a radio-controlled timepiece, and the mechanism and appearance of the radio-controlled timepiece without lowering the reception sensitivity. The above functions can be improved.
[0215]
Further, the reception sensitivity is further improved by the material of the body member 45 or the back cover member 41, the shape of the back cover member, the positional relationship between the antenna portion 32 and the body member 45 or the back cover member 41, the addition of a nonmagnetic member, and the like. You can also. In addition, regarding the thickness of the body member or the back cover member and the distance from the antenna to the body member 45 or the back cover member 41, the most effective value obtained by repeated experiments was obtained.
[0216]
The configuration conditions of the metal exterior part 31 and the antenna part 32 used in the present invention will be specifically described below with reference to the drawings.
[0217]
First, in order to investigate the relationship between the reception sensitivity and the watch case, as shown in FIGS. 15A and 15B, the body member thickness T1 of the body member 45, the antenna portion 32, and the inner surface of the body member 45 are The distance D1, the thickness T2 of the back cover member 41, and the distance D2 between the antenna portion 32 and the inner surface of the back cover member 41 are selected as parameters, and these four parameters and the peak height of the signal received by the antenna portion 32 are selected. The relationship with the gain was obtained from the experiment.
[0218]
The body member 45, the antenna part 32, and the back cover member 41 in each experiment described below were used for experiments formed on the assumption that they are used as the electronic device 30 including a timepiece.
[0219]
The material of the body member 45 and the back cover member 41 is made of stainless steel, titanium, titanium alloy, gold, gold, considering good workability, durability, corrosion resistance, good appearance quality as a product, price, etc. Alloys, silver, silver alloys, copper, trunk alloys, brass, aluminum, aluminum alloys, zinc, zinc alloys, magnesium, magnesium alloys and alloys containing tungsten carbide and tantalum carbide as cemented carbide were selected, but in any experiment Although there was an increase and decrease in gain of several dB, there was almost no change in the relationship between the parameters and the gain (graph curve shape). Therefore, in each experiment shown below, stainless steel (especially austenitic stainless steel was Since it is preferable, for example, SUS304, SUS304L, SUS316, SUS316L, etc.) are replaced with the body member 45 and the back cover member 4. It shows the numerical value of the case that was used to.
[0220]
In the first experiment, the gain of the received signal was measured when the body member thickness T1 was changed from 0 to 5000 μm. In this experiment, an experimental antenna with a conductor diameter of 65 μm and the number of windings of 1500 is used as an antenna installed in the body member 45, the distance between the body member 45 and the antenna portion 32 is set to be constant at 1000 μm, and the back cover An experiment in which a member having a back cover member thickness of 800 μm is used as the member 41, the distance between the antenna unit 32 and the back cover member 41 is set to be constant at 100 μm, and a 40 kHz signal is transmitted from a transmitting antenna installed at a predetermined position. went.
[0221]
As a result, as shown in FIG. 16, the gain of the received signal gradually decreases as the body member thickness increases from about −50 dB when the body member thickness T1 is 0 μm (without the body member 45), and the body member thickness increases. When T1 reaches 5000 μm, the decrease is saturated. The solid line shown in FIG. 16 is an approximate curve obtained from experimental data.
[0222]
According to the first experiment, it was found that when the barrel member thickness T1 exceeds 5000 μm, the decrease in gain becomes saturated and constant, and the value at this time becomes the minimum value. For this reason, if the trunk member thickness T1 is set between 0 and 5000 μm, the gain can be improved with respect to the minimum value. In consideration of the strength and the like that can be used as a watch case within the above range, the body member thickness T1 is preferably set in a range of 300 μm to 5000 μm, which is practically the maximum. In addition, in order to form the most suitable body member in consideration of appearance, workability, corrosion resistance, etc. as the case of the electronic device 30, that is, the metal exterior part 31, the body member thickness T1 is set in the range of 500 to 2000 μm. Is preferred.
[0223]
In the second experiment, the gain of the received signal was measured when the distance D1 between the antenna unit 32 and the body member 45 was changed from 0 to 40000 μm. FIG. 17 shows the measurement results from 0 to 20000 μm. In this experiment, an experimental antenna having a conductor diameter of 65 μm and a winding number of 1500 is used as the antenna portion 32 installed in the body member 45, and a body member having a body member thickness of 2000 μm is used as the body member 45. As an example, a case was used in which a back cover member having a thickness of 800 μm was used, the distance between the antenna unit 32 and the back cover member 41 was set to be constant at 100 μm, and a 40 kHz signal was transmitted from a transmission antenna installed at a predetermined position. .
[0224]
As a result, as shown in FIG. 17, the gain of the received signal increases when the distance D1 is away from about −54.5 dB where the distance D1 is 0 μm (a portion of the antenna unit 32 is in contact with the body member 45). Rise gradually. In this experiment, since the gain of the received signal is −50.34 dB when only the back cover member 41 is used (that is, when the body member 45 is removed), the antenna unit 32 and the body when the gain becomes this value. The increase in gain is saturated at the distance D1 from the member 45. Thus, the distance D1 at which the gain increase is saturated is 40000 μm, and the gain cannot be increased even if the antenna portion 32 and the body member 45 are further separated from each other. Note that the solid line shown in FIG. 17 is an approximate curve obtained from experimental data.
[0225]
According to the second experiment, when the distance D1 between the antenna unit 32 and the body member 45 is increased, the gain increases and the reception sensitivity is improved. However, when the distance D1 exceeds 40000 μm, the gain increase is saturated. And found it to be constant. For this reason, if the distance D1 is set between 0 and 40000 μm, the gain can be improved. In consideration of the size that can be used as a watch case within the above range, the distance D1 is preferably set to 500 to 10,000 μm.
[0226]
In the third experiment, the gain of the received signal was measured when the back cover member thickness T2 was changed from 0 to 5000 μm. FIG. 18 shows the measurement results from 0 to 3000 μm. In this experiment, an experimental antenna with a conductor diameter of 65 μm and a winding number of 1500 is used as the antenna, the distance between the back cover member 41 and the antenna portion 32 is set to be constant at 1000 μm, and the trunk member 45 has a trunk member thickness of 2000 μm. An experiment was performed in which a distance between the antenna unit 32 and the back cover member 41 was set to a constant value of 100 μm, and a 40 kHz signal was transmitted from a transmitting antenna installed at a predetermined position.
[0227]
As a result, as shown in FIG. 18, the gain of the received signal decreases rapidly from about −43.4 dB to 800 μm when the back cover member thickness T2 is 0 μm (without the back cover member 41). It was found that there was not much change in gain when the member thickness T2 was 800 μm to 5000 μm. That is, it was found that the minimum value was obtained when the back cover member thickness T2 was 800 μm. The solid line shown in FIG. 18 is an approximate curve obtained from experimental data.
[0228]
The minimum value is practically acceptable, and within the above range, considering the strength that can be used as the metal exterior part 31 of the electronic device 30, the back cover member thickness T2 is within the range of 100 μm to the practically maximum 5000 μm. It is preferable to set. In order to form the most suitable back cover in consideration of appearance, workability, corrosion resistance, etc. as the metal exterior portion 31, it is preferable to set the back cover member thickness T2 in the range of 300 to 2000 μm.
[0229]
In the fourth experiment, the gain of the received signal was measured when the distance D2 between the antenna unit 32 and the back cover member 41 was changed to 0 to 5000 μm. In this experiment, an experimental antenna having a conductor diameter of 65 μm and a winding number of 2000 is used as the antenna section 32 to be installed, a trunk member having a trunk member thickness of 2000 μm is used, and a back cover member thickness is used as the back cover member 41. An experiment was performed in which a 800-μm one was used, the distance D1 between the body member 45 and the antenna unit 32 was set to 1000 μm, and a 40-kHz signal was transmitted from a transmitting antenna installed at a predetermined position.
[0230]
As a result, as shown in FIG. 19, the gain of the received signal goes away from about −49.6 dB when the distance D2 is 0 μm (a part of the antenna unit 32 is in contact with the back cover member 41). And gradually rise. In this experiment, since the gain of the received signal is −38.8 dB when only the body member 45 is used (that is, when the back cover member 41 is removed), the antenna unit 32 when the gain is substantially equal to this value. The increase in gain is saturated at the distance D2 from the back cover member 41. Thus, the distance D2 where the gain increase is saturated is 5000 μm, and the gain cannot be increased even if the antenna portion 32 and the back cover member 41 are further separated. The solid line shown in FIG. 19 is an approximate curve obtained from experimental data.
[0231]
According to the fourth experiment, the distance D2 between the antenna unit 32 and the back cover member 41 increases the gain and the reception sensitivity is better, but the gain increases when the distance D2 exceeds 5000 μm. It turned out to be saturated and constant. For this reason, if the distance D2 is set between 0 and 5000 μm, the gain can be improved. In consideration of the size that can be used as a watch case within the above range, the distance D2 is preferably set to 100 to 700 μm.
[0232]
Next, a specific example of the electronic device 30 of the present invention based on the result of the above experiment will be described with reference to FIG. FIG. 2 is a sectional view showing a radio-controlled timepiece according to the present invention, and the basic configuration has already been described above.
[0233]
A predetermined space 51 is provided between the movement 42 and the back cover member 41, and the antenna unit 32 is disposed in the space 51. The antenna unit 32 is fixed to the lower surface of the movement 42.
[0234]
In the present invention, the antenna portion 32 may be disposed so as to be in contact with the inner surface of the metal exterior portion 31, and has a gap with the inner surface of the metal exterior portion 31. It may be provided.
[0235]
In this specific example, both the body member 45 and the back cover member 41 are made of austenitic stainless steel (for example, SUS316L). Further, based on the experimental results, the body member thickness of the body member 45 is set to 1600 μm, and the distance from the antenna portion 32 to the inner surface of the body member 45 is set to 2000 μm. Further, the thickness of the back cover member 41 is set to 800 μm, and the distance from the antenna portion 32 to the inner surface of the back cover member 41 is set to 3000 μm.
[0236]
In the radio-controlled timepiece 30 having the above-described configuration, the CPU in the movement 42 is driven so as to always correct the hands 36 by operating the display driving unit based on the standard radio wave received by the antenna unit 32. At this time, in this specific example, the trunk member 45 and the back cover member 41 are formed of metal, but the thickness of the trunk member, the thickness of the back cover member, and the distance between the antenna portion and the trunk member 45 and the back cover member 41 are set. Since each is set to a value based on an experimental result that optimizes the reception sensitivity, the disturbance of the resonance phenomenon near the antenna is reduced and the reception sensitivity is improved.
[0237]
In addition, on the inner surface of the back cover member 41 or the inner surface of the body member 45, such as gold, gold alloy, silver, silver alloy, copper, body alloy, brass, aluminum, aluminum alloy, zinc, zinc alloy, magnesium, magnesium alloy, etc. It has been experimentally confirmed that when a nonmagnetic member having an electrical resistivity of 7.0 μΩ · cm or less is attached, the gain is improved by about 2 to 3 dB.
[0238]
Further, one or both of the body member 45 and the back cover member 41 can be subjected to a hardening process such as a carburizing process, and a decrease in reception sensitivity due to the hardening process was not recognized.
[0239]
As a specific example different from the above specific example in the present invention, the basic configuration shown in FIG. 2 is the same, but the material of the body member 45 and the back cover member 41, the body member thickness of the body member 45, the antenna The distance between the portion 32 and the body member 45, the thickness of the back cover member 41, and the distance between the antenna portion 32 and the back cover member 41 are set to be different from the above specific example.
[0240]
That is, the body member 45 and the back cover member 41 in this specific example are made of titanium.
[0241]
In the case of the body member 45 and the back cover member 41 made of titanium, the body member thickness is set to 2000 μm, which is thicker than the specific example, assuming a standard corresponding to high pressure waterproofing, and the back cover member thickness is similarly 1000 μm. Is set.
[0242]
In addition, because of the relationship with the material of the body member 45 and the back cover member 41, even if the distance between the antenna unit 32 and the body member 45 and the back cover member 41 is narrowed, it is possible to obtain acceptable reception sensitivity. The distance between the antenna part 32 and the body member 45 is set to 500 μm, and the distance between the antenna part 32 and the back cover member 41 is set to 400 μm.
[0243]
In the case of this specific example, the gain can be improved by about 2 to 3 dB by attaching a nonmagnetic member similar to the specific example described above to the inner surface of the back cover member 41 or the inner surface of the body member 45. It is.
[0244]
In this specific example, one or both of the body member 45 and the back cover member 41 can be subjected to a curing process such as a nitriding process, and the reception sensitivity is reduced due to the curing process. Is also not allowed.
[0245]
The radio wave correction timepiece according to another specific example shown in FIG. 22 according to the present invention employs substantially the same configuration as the configuration shown in FIG. 2, but the body member 45 and the back cover member 41. The material is different.
[0246]
That is, in the configuration of FIG. 2, the body member 45 and the back cover member 41 are made of brass material and are mirror-finished, and then, as shown in FIG. The plated layers 221 and 222 are formed and finished. The brass material is a non-magnetic member having an electrical resistivity of 7.0 μΩ · cm or less that makes the reception sensitivity confirmed in the experiment in a good state, and improves the reception sensitivity together with the setting of the body member thickness and the like. is there.
[0247]
The case member 45 and the back cover member 41 in this specific example are the same as the specific example except that plating is performed, the thickness of the case member is set to 1600 μm, and the thickness of the back cover member is set to 800 μm. ing. The distance between the antenna part 32, the body member 45 and the back cover member is set such that the distance between the antenna part 32 and the body member 45 is 2000 μm, and the distance between the antenna part 32 and the back cover member 41 is 3000 μm. Is set.
[0248]
The plated layers 221 and 222 of the body member 45 and the back cover member 41 are formed by wet plating as described below.
[0249]
First, in order to form a base plating layer, the main body 300 and the main body 301 are provided with a plating bath (composition: Na ₂ SnO ₃ ・ 3H ₂ O 60 g / l (liter), CuCN 20 g / l, K ₂ SO ₃ H 10 g / l, KCN (free) 30 g / l, KOH 60 g / l, Zn (CN) ₂ 5 g / l), bath temperature 50 ° C., current density 2.4 A / dm ² , PH 12.5, deposition rate 0.33 μm / min, time 6 minutes. Thereby, a base plating layer of about 2 μm of Cu—Sn—Zn alloy is formed on the surfaces of the main body 300 and the main body 301.
[0250]
Next, an Sn—Cu—Pd alloy plating layer is formed on the base plating layer by plating under the following conditions. Plating bath (Composition: Na ₂ SnO ₃ ・ 3H ₂ O 60 g / l (Sn equivalent 26.7 g / l), CuCN 20 g / l (Cu equivalent 14.2 g / l), K ₂ SO ₃ H 10 g / l, KCN (free) 30 g / l, KOH 60 g / l, K ₂ Pd (CN) ₄ ・ 3H ₂ O 30 g / l (Pd conversion amount 9.3 g / l)). Plating conditions: bath temperature 50-55 ° C., current density 2.0 A / dm ² Current efficiency 47.8%, pH 12.5-13, deposition rate 0.33 μm / min, time 9 minutes. By this plating, a thickness of about 3 μm, a hardness (Hv) of about 300, and a density of 9.6 g / cm are formed on the base plating layer. ³ The Sn—Cu—Pd alloy plating layer is formed. When the composition of this plating layer was simply quantified with a scanning electron microscope and an X-ray microanalyzer, it was a ternary alloy of Sn: 17.12% by weight, Cu: 44.22% by weight, and Pd: 38.66% by weight. Was confirmed.
[0251]
Thereafter, the finish plating layer is formed by plating on the Sn—Cu—Pd alloy plating layer under the following conditions. Plating bath ("Parabrite-SSS" (trade name) manufactured by Japan High Purity Chemical Co., Ltd.). Plating conditions: bath temperature 55 ° C., current density 1.5 A / dm ² , PH 7.6, deposition rate 0.33 μm / min, time 6 minutes. By this plating, a Pd plating layer having a white gloss with a thickness of about 2 μm is formed, and the plating layers 221 and 222 are completed.
[0252]
The body member 45 and the back cover member 41 on which the plating layers 221 and 222 are formed as described above are sodium chloride 9.9 g / l, sodium sulfide 0.8 g / l, urea 7.1 g / l, ammonia water Even if a corrosion resistance test is conducted for 24 hours in artificial sweat (temperature 40 ° C.) consisting of 0.19 ml / l, sucrose 0.2 g / l, and lactic acid (50%) 0.8 ml / l, the surface will not change color. And good corrosion resistance. In addition, the body member 45 and the back cover member 41 do not show any peeling of the plating layers 221 and 222 even when subjected to a heating test that is allowed to stand at a temperature of 200 ° C. for 5 hours, and also have good heat resistance. .
[0253]
Also in this specific example, the body member 45 and the back cover member 41 are made of metal, but the body member thickness, the back cover member thickness, the antenna portion 32, the body member 45, and the back cover member 41 Is set to a value based on an experimental result that optimizes the reception sensitivity, so that disturbance of resonance phenomenon near the antenna is reduced and reception sensitivity is improved. In addition, since the body member 45 and the back cover member 41 are surface-finished, they have corrosion resistance and heat resistance necessary for use as a watch, and are heavy and high-grade white metallic luster. Therefore, the appearance quality is also high.
[0254]
In any of the above specific examples, like the back cover member 41 shown in FIG. 22, the back cover member 41 is flattened on the inner surface without forming a rising portion, and the back cover member 41 has a planar secondary shape. Then, as compared with the case where the rising portion is provided, the disturbance of the resonance phenomenon around the antenna portion 32 can be reduced, and the receiving sensitivity can be improved by about 2 dB.
[0255]
In addition, in order to further reduce the size and thickness of the watch, the distance between the antenna unit 32 and the body member 45 or the back cover member 41 can be set to 0 in consideration of the directivity of the antenna unit 32. It is.
[0256]
Further, the antenna unit 32 is arranged so that the outer surface of the antenna unit 32 and the inner surface of the body member 45 or the inner surface of the back cover member 41 are parallel, while taking into consideration the directivity of the antenna unit 32. It is also possible to dispose the one end surface of the antenna part 32 in a substantially vertical direction with respect to the inner surface so as to stand vertically.
[0257]
Moreover, although the metal exterior part 31 in each said specific example is comprised by the said trunk | drum member 45 and the said back cover member 41, what provided the bezel and the ring in the upper part of the trunk | drum member 45 can also be used. Furthermore, in this case, as will be described later, if any of the body, the bezel, and the back cover member is formed of a nonmagnetic member, the reception sensitivity can be further improved. Further, by making the bezel and the like separate from the body member 45, the reception sensitivity can be improved.
[0258]
Further, not only the entire body member, bezel, and back cover member are formed of nonmagnetic members, but also reception sensitivity can be improved by forming only a part of them by nonmagnetic members.
[0259]
In that case, it is effective and preferable to form only the part where the antenna part 32 is projected in parallel or the part facing the end part of the antenna part 32 with a nonmagnetic member.
[0260]
Further, not only one type of metal and nonmagnetic member but also a plurality of metals and nonmagnetic members can be used in combination.
[0261]
In addition, regarding the selection of the material used for the body member 45 and the back cover member 41, in the case of the body member 45 for experiment and the back cover member 41 formed of the material to be used, as in the experiment described above. The experiment antenna was installed and selected by conducting an experiment of transmitting a signal from a transmission antenna installed at a predetermined position.
[0262]
As a result of this experiment, in the case of gold, gold alloy, silver, silver alloy, copper, trunk alloy, brass, aluminum, aluminum alloy, zinc, zinc alloy, magnesium, magnesium alloy and cemented carbide (tungsten-carbide alloy) Compared with stainless steel, titanium, titanium alloy, and tantalum carbide, the gain was increased by 2-3 dB (decibel). In addition, in the same experiment, not only when the exterior part is formed of a metal with good reception sensitivity, but also when the exterior part is formed with a metal with low reception sensitivity, the reception sensitivity is improved in a part thereof. We also verified that it is possible to improve the receiving sensitivity of the antenna inside the exterior by providing metal.
[0263]
In addition, by comparing the electrical resistivity of the metals used in the experiment, it was found that an electrical resistivity of 7 μΩ · cm or less can maintain good reception sensitivity. As a result, the entire exterior part or its non-magnetic member such as gold, gold alloy, silver, silver alloy, copper, trunk alloy, brass, aluminum, aluminum alloy, zinc, zinc alloy, magnesium, magnesium alloy and cemented carbide It has been found that if a part is formed, the receiving sensitivity can be improved even for an exterior part using metal.
[0264]
Furthermore, even in the exterior part of an electronic device made of a metal having high electrical resistivity such as stainless steel, titanium, titanium alloy, and tantalum carbide having excellent appearance quality, a part made of the non-magnetic member is part of the exterior part. It has also been verified that the reception sensitivity can be improved if there is.
[0265]
In addition, as for the material of the body member 45 and the back cover member 41, a resin part is used for a bezel or the like in order to enrich the color, or a resin decoration is attached to the side surface of the body member for decoration. However, it is needless to say that even if such a structure is used, a metal that uses a metal as a basic component is included in the scope of the metal sheath in the present invention.
[0266]
In the present invention, it is desirable that the inner surface of the body of the metal exterior part 31 and the outer surface of the antenna part be substantially parallel to each other. It is also desirable that the inner surface of the lid and the outer surface of the antenna portion be configured to be substantially parallel.
[0267]
Furthermore, in the present invention, it is also preferable that the back cover member 41 of the metal exterior portion 31 is configured to have a planar two-dimensional shape.
[0268]
In the present invention, it is also preferable to dispose one end surface of both ends of the antenna portion in a substantially vertical direction with respect to the inner surface of the back cover member 41 of the metal exterior portion 31.
[0269]
On the other hand, in the present invention, it is also desirable that at least one nonmagnetic member having an electrical resistivity of 7.0 μΩ · cm or less is fixed to the inner surface of the metal exterior portion 31. The magnetic member is made of at least one of gold, silver, copper, brass, aluminum, zinc, magnesium, or an alloy thereof.
[0270]
Furthermore, in the present invention, the antenna section 32 is composed of a magnetic core material 38 and a plurality of coils 40 wound around the magnetic core material 38, and includes at least one plane including the axis of the magnetic core material 38. It is also preferable that the member on which the antenna portion 32 is projected in parallel or the portion on which the antenna portion 32 is projected is made of the nonmagnetic member.
[0271]
In the present invention, the antenna unit 32 includes a magnetic core member 38 and a plurality of coils 40 wound around the magnetic core member 38, and is opposed to at least the end of the antenna unit 32. It is also preferable that the member or the opposing part of the member is made of the nonmagnetic member.
[0272]
In addition to the specific examples described above, in the present invention, it is necessary to provide countermeasures against static electricity in the electronic device 30. For this reason, at least a part of the metal exterior portion 31 is provided with an electrical conduction portion. It is also preferable that
[0273]
As the electrostatic treatment mechanism in the present invention, for example, an appropriate electrical conduction portion is provided in a part of the body member 45 or the back cover member 41, and the conduction portion is the antenna portion. It is desirable to provide it at a position away from a predetermined distance from 32. Furthermore, as the conduction method, for example, treatment such as welding, silver paste, conductive ring, conductive resin, or caulking can be employed.
[0274]
For example, in the electronic device or radio wave correction watch, when the push button or part of the crown is pressed or pulled out, the appropriate contacts come into contact with each other to discharge static electricity. It may be configured such that an appropriate conductive ring may be inserted into the electronic device or the radio-controlled timepiece.
[0275]
Furthermore, in the radio-controlled timepiece, at least one place may be welded to the body member and the bezel part, or silver paste is applied to at least one place between the body member and the bezel part. It may be a thing.
[0276]
Next, regarding the electronic device 30 according to the present invention described above, another configuration for differentiating the electrical resistance value of at least a part of the joint portion 39 from the electrical resistance value of other portions, for example, the metal By forming at least a part of the plane area of the joint part 39 formed by joining the at least two metal members in the exterior part 31 to be smaller than the plane area of the remaining joint part. Can also be realized.
[0277]
In addition, the thickness of at least a part of the body member 45 and / or the back cover member 41 on which the coil portion 40 of the antenna unit 32 is projected is thinner than the thickness of the other body member 45 or the back cover member 41. It can also be realized by configuring as above.
[0278]
On the other hand, the present inventors constitute the metal exterior portion 31 composed of a plurality of metal members in the electronic device 30 while performing the above-described practical application of the present invention. It has been found that the gain of the antenna part 32 changes depending on the joining pressure of the joining part 39 formed between a plurality of metal members.
[0279]
That is, when the metal exterior part 31 is composed of two or more kinds of metal members, the present inventors mutually connect predetermined portions of the plurality of metal members, usually the peripheral parts to each other. And fixed by welding under a predetermined pressure condition, or by fixing with a predetermined tightening force using a plurality of bolts with screws, or by fitting them together with a caulking method. It is practical to form a male screw and a female screw separately on the member, screw them together, and fix them with a predetermined tightening torque.
[0280]
By the way, the inventors of the present application have learned that the antenna gain of the antenna portion 32 changes due to a change in the contact pressure condition of the joint surfaces of the plurality of metal members in the metal exterior portion 31. is there.
[0281]
That is, the back cover member 41 is tightened in the metal exterior part 31 where the body member 45 and the back cover member 41 are connected to each other in the electronic apparatus 30 having the conventional structure shown in FIG. It was found that when the torque is changed, the antenna gain (dB) of the antenna unit 32 changes as shown in FIG.
[0282]
That is, it was found that when the tightening torque is changed between 0 and 6 N · m, the gain of the antenna decreases as the tightening torque increases, and the maximum attenuation decreases by about 3 dB.
[0283]
It should be noted that when the tightening torque is 6 N · m or more, measurement is not performed because there is substantially no device to measure, but it can be understood from FIG. It is understood that the antenna gain decreases when the contact pressure with the lid member 41 is increased.
[0284]
Therefore, in the metal exterior part 31, the body member 45 and the back cover member 41 are not joined by a screw type, but the above-described welding fixing method, a fixing method using a plurality of screwed bolts, or a caulking Even if the method is used, it is assumed that the same result is obtained.
[0285]
Therefore, the present inventors conducted the following experiment in order to examine the reason why such a phenomenon occurs.
[0286]
First, as shown in FIGS. 33 (A) and 33 (B), when the Vdd contact spring F is used inside the electronic device 30 and when the Vdd contact spring F is removed or bent, the back cover member 41 and FIG. 24 shows the result of comparison of the characteristic values of the antenna unit 32 when the contact is cut off.
[0287]
In FIG. 24, the data before the change is data measured in a state where the Vdd contact spring R is normally used, and the data after the change is that the contact between the Vdd contact spring and the back cover member 41 is cut off. It is the data measured in the case of.
[0288]
Comparing both data, as long as the characteristic value of the antenna unit 32 is viewed, there is no substantial difference between the two including the gain data.
[0289]
However, even if the back cover member 41 is tightened, the influence of the Vdd contact spring R due to the tightening can be eliminated by eliminating the Vdd contact spring R.
[0290]
Further, as shown in FIGS. 34 (A) and (B), the inventors have eliminated the contact point between the movement 42 and the back cover member 41, and the movement 42 is tightened by tightening the back cover member 41. The characteristic values of the antenna unit 32 when the influence of the deformation is eliminated are compared, and the result is shown in FIG.
[0291]
In FIG. 25, the data before the change is data measured in a state where the contact point between the movement 42 and the back cover member 41 remains through the damper P as shown in FIG. The subsequent data is data measured when the contact point between the movement 42 and the back cover member 41 is eliminated as shown in FIG.
[0292]
Comparing both data, as long as the characteristic value of the antenna unit 32 is viewed, there is no substantial difference between the two including the gain data.
[0293]
However, even if the back cover member 41 is tightened, the influence of the movement 42 due to the tightening can be eliminated by eliminating the damper P.
[0294]
Further, as shown in FIG. 26 (A), the present inventors insert an appropriate insulator between the body member 45 and the back cover member 41 in the metal exterior part 31, and The effect of reducing the degree to which the back cover member 41 pressed the movement 42 was examined.
[0295]
The result is shown in FIG.
[0296]
In FIG. 26B, the data before the change is data measured without inserting the insulator, and the data after the change is data measured when the insulator is inserted.
[0297]
Comparing the two data, the gain is not improved at all even if the influence on the movement 42 is reduced. Therefore, the movement 42 is deformed by tightening the back cover member 41, and the characteristics of the antenna 32 are determined. Is unlikely to decline.
[0298]
Therefore, the present inventors reviewed and examined the experimental results of FIGS.
[0299]
The experiments of FIGS. 6 and 8 were conducted with a screw tightening torque of 3 N · m.
[0300]
Then, as described above, it is understood that the gain of the antenna portion 32 slightly decreases when a part of the joint portion is left in the sector area as shown in FIG.
[0301]
Therefore, the inventors of the present application further performed another experiment.
[0302]
That is, in the configuration shown in FIG. 6, the metal exterior portion 31 in which the fan-shaped region in which the gap portion 55 is provided is set so that the center angle is 90 degrees is used, and the tightening torque of the back cover member 41 is changed. The gain of the antenna unit 32 when measured was measured.
[0303]
The result is shown in FIG.
[0304]
In FIG. 27, a graph of 90 degrees is a graph showing the gain of the antenna obtained by this experiment, and the current graph shows the gain of the antenna in the conventional metal exterior portion 31 in which the gap portion 55 is not formed. It is a graph to show.
[0305]
From this experimental result, it can be seen that in the case of the configuration according to the experiment, the attenuation of the gain of the antenna portion due to the tightening torque of the back cover member 41 is greatly reduced as compared with the conventional structure.
[0306]
From this result, the gain of the antenna is greatly improved by cutting the screw part around the antenna. Therefore, the tightening torque of the back cover member increases, and the screw part around the antenna causes magnetic coupling. It is presumed that an eddy current loss that hinders the resonance phenomenon of the antenna occurs and the gain of the antenna decreases.
[0307]
Therefore, in the present invention, it is considered that it is not preferable to increase the bonding force between the body member 45 and the back cover member 41 in the metal exterior portion 31. Accordingly, an appropriate tightening force or bonding force is required.
[0308]
However, even if the tightening torque of all samples used in the experiment is constant, the value of the loosening torque after the waterproof test varies.
[0309]
For example, if the tightening torque is 2 N · m, the loosening torque after the waterproof test is 1.6 N · m at maximum, 0.8 N · m at minimum, and 1.1 N · m on average (30 samples measured). Was 3 N · m, the loosening torque after the waterproof test was a maximum of 3.5 N · m, a minimum of 1.7 N · m, and an average of 2.5 N · m (30 samples measured).
[0310]
In addition, depending on the value of the tightening torque, some samples with a tightening torque of less than 0.1 N · m failed the waterproof test.
[0311]
From the above, since it is difficult to measure when the tightening torque is stronger than 6 N · m, and there is no necessity of stronger than 6 N · m from the value of the antenna gain, it is considered that the loosening torque may be 6 N · m or less.
[0312]
From the above, the loosening torque is preferably 0.6 to 6 N · m, and practically preferably 0.2 to 4.5 N · m.
[0313]
Therefore, as another aspect of the present invention, at least an antenna unit, an information processing device for processing information captured by the antenna unit, and the antenna unit and the information processing device can be accommodated therein. The metal exterior portion is configured such that the antenna portion can receive magnetic flux from the outside of the metal exterior via the metal exterior and can resonate. And the metal exterior part is composed of a body part (side part) and a back cover member, and the body part (side part) material and the back cover member are joined to each other, However, the mutual peeling force between the body (side) material and the back cover member is 10 ^-4 It may be an electronic device characterized by N · m to 6.0 N · m, or at least an antenna unit, an information processing device for processing information captured by the antenna unit, and the antenna Part and a metal exterior part capable of accommodating the information processing apparatus therein, the metal exterior part is configured such that the antenna part is external to the metal exterior from the outside. It is configured to receive magnetic flux through a metal sheath and can resonate, and the metal sheath portion is composed of a trunk portion (side portion) material and a back cover member, and the trunk portion ( The side part material and the back cover member are joined to each other via a screw mechanism, and the mutual loose torque between the body part (side part) material and the back cover member is 0.1 N · m to 6 0.0 N · m, preferably 0.2 N · m to 3.5 N · m It may be there in the electronic apparatus characterized.
[0314]
Next, in the present invention, in order to verify whether or not there is a difference in the effect of the present invention due to a difference in the joint portion of the metal exterior portion 31 in the electronic device 30, the following experiment was performed. It was.
[0315]
That is, the body member 45 of the metal exterior part 31 is composed of the upper body part and the middle body part, and after closing the one in which the packing is press-fitted between the upper body part and the middle body part with the back cover member, the The sample (A, B, C, F) joined to the back cover member with a tightening torque of 3 N · m, the upper body part and the middle body part are joined by laser welding and closed with the back cover member, and then the back cover Samples (D, E) joined with a member tightening torque of 3 N · m are prepared, and the same antenna portion 32 is disposed in each sample at the same position as shown in FIG. The value was measured.
[0316]
The result is shown in FIG.
[0317]
As is clear from the results of the comparative experiment in FIG. 29, it was found that the gain value of the antenna related to the Ti sample (D) and the SS sample (E) decreased.
[0318]
As the cause of this, as described above, it is presumed that strong magnetic coupling is formed on the joint surface between the upper body part and the middle body part.
Therefore, in the samples (D) and (E), a sectoral region having a central angle of 90 degrees in the laser welded portion 39 formed on the joint surface between the upper barrel portion and the middle barrel portion shown in FIG. As a result of removing the portion corresponding to the portion 57 and forming the gap portion 55 so as to have an insulating function, the same gain value as that of other samples was obtained.
[0319]
The result is shown in FIG.
[0320]
【The invention's effect】
Since the present invention adopts the configuration as described above, it solves the above-described problems of the prior art and significantly changes the structure, exterior material, or design of an electronic device including a conventional radio-controlled timepiece. In addition, by adopting an antenna unit with a simple configuration, the reception efficiency is good, the size and thickness of the electronic device itself is not different from the conventional one, and the design cost is increased, and the manufacturing cost is increased An electronic device that can be kept inexpensive is easily obtained.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a specific example of an electronic apparatus according to the invention.
FIG. 2 is a cross-sectional view showing the configuration of another specific example of the electronic apparatus according to the invention.
FIG. 3 is a partial cross-sectional view of a specific example of an electronic apparatus according to the invention.
It is a graph which shows the change of Q value by the influence of the metal plate of the antenna main-body part in this invention and the former.
4A is a diagram showing an example of the shape of the joint surface between the trunk member and the back cover member in the metal exterior according to the present invention and the arrangement relationship of the antennas; FIG. ) Is a partial cross-sectional view of FIG.
FIG. 5 (A) is a partial cross-sectional view of another specific example of the metal exterior according to the present invention, and FIG. 5 (B) shows the center angle of the sector area and the gain of the antenna. It is a graph which shows the relationship.
FIG. 6 (A) is a partial cross-sectional view of another specific example of the metal exterior according to the present invention, and FIG. 6 (B) is an explanatory diagram for explaining the sector region. is there.
FIG. 7 (A) is a partial cross-sectional view of still another specific example of the metal exterior according to the present invention, and FIG. 7 (B) is an explanatory diagram for explaining the sectoral region. It is.
FIG. 8 (A) is a plan view showing a specific example in the case where a joint part is partially left in a fan-shaped region part in a metal exterior part according to the present invention, and FIG. FIG. 9 is a diagram showing experimental data for explaining the effect of the structure of FIG.
FIG. 9 is a diagram showing a configuration of a specific example of an antenna structure according to the present invention.
FIG. 10 is a graph showing a relationship between L value and gain in an antenna structure.
FIG. 11 is a graph showing the relationship between the number of windings (T) and the gain in the antenna structure.
FIG. 12A is a graph showing the relationship between winding resistance (Ω) and gain in an antenna structure, and FIG. 12B is a diagram showing an example of the configuration of a coil. .
FIG. 13 is a graph showing the relationship between winding resistance (Ω) and gain in an antenna structure.
FIG. 14 is a diagram illustrating an example of an arrangement configuration of components in a radio wave timepiece that is a specific example of the electronic apparatus according to the invention.
FIGS. 15A and 15B are a plan view and a cross-sectional view illustrating the positional relationship between the metal exterior portion and the antenna portion, respectively.
FIG. 16 is a graph showing a relationship between a trunk member thickness and an antenna gain in the electronic apparatus according to the present invention.
FIG. 17 is a graph showing the relationship between the distance between the body member and the antenna and the gain of the antenna in the electronic apparatus according to the present invention.
FIG. 18 is a graph showing the relationship between the thickness of the back cover member and the gain of the antenna in the electronic apparatus according to the present invention.
FIG. 19 is a graph showing the relationship between the distance between the back cover member and the antenna and the gain of the antenna in the electronic apparatus according to the present invention.
FIG. 20 is a diagram for explaining the outline of the configuration of a radio-controlled timepiece as a specific example of the electronic apparatus according to the invention.
FIG. 21 is a diagram for explaining the details of the configuration of a conventional radio-controlled timepiece.
FIG. 22 is a diagram illustrating details of a configuration of a radio-controlled timepiece as a specific example of the electronic apparatus according to the invention.
FIG. 23 is a graph showing the relationship between torque and antenna gain;
FIG. 24 is a diagram showing data indicating changes in antenna characteristic values depending on the presence / absence of a contact between the Vdd contact spring and the back cover member in the electronic apparatus according to the present invention.
FIG. 25 is a diagram showing data indicating changes in the characteristic value of the antenna depending on the presence / absence of a contact between the movement and the back cover member in the electronic apparatus according to the invention.
FIG. 26A is a partial cross-sectional view showing a configuration of a specific example in which an insulator is inserted between a body member and a back cover member in the electronic apparatus according to the present invention. FIG. 26B is a diagram illustrating data indicating a change in the characteristic value of the antenna depending on whether or not an insulator is inserted.
FIG. 27 is a graph showing the relationship between torque and antenna gain;
FIG. 28 is a plan view for explaining the positional relationship between a sector area and an antenna in the electronic apparatus according to the present invention.
FIG. 29 is a diagram showing data indicating changes in antenna characteristic values in a plurality of specific examples of the electronic apparatus according to the invention.
FIG. 30 is a diagram showing data indicating changes in antenna characteristic values in another specific example of the electronic apparatus according to the invention.
FIG. 31 illustrates the result of an experiment conducted on the effect of the antenna portion depending on the arrangement position in the case where a gap portion is provided at the joint portion between the body member and the back cover member constituting the metal exterior portion. It is a figure to do.
FIG. 32 is a diagram showing a position where an antenna portion is arranged, a length of the gap portion, and a fan shape when a gap portion is provided at a joint portion between a trunk member and a back cover member constituting a metal exterior portion; It is a figure explaining the relationship with the center angle of an area | region.
FIG. 33 is a diagram illustrating a configuration example for eliminating the influence of a Vdd contact in a metal exterior part.
FIG. 34 is a diagram illustrating a configuration example for eliminating the influence of a movement in a metal exterior part.
[Explanation of symbols]
1 Antenna
2 radio clock receiver
3 CPU
4 Display driver
5 input devices
10 Case 10
11 torso
12 Back cover member
13 Windshield
14 movement
15 Dial
16 needles
17 bar antenna
18, 38 Magnetic core member
20 coils
21 Conductor
22 Ring edge frame
221 and 222 plating layer
23 Glass
30 Electronic equipment, radio-controlled clock
31 Metal exterior
32 Antenna section
33, information processing apparatus
34 CPU
35 Information display / notification means
36 Guidelines
37a Step
37b Inward protrusion
37c Inner side surface of body member 45
38 Magnetic core material
39 joints
41 Back cover member
42 Movement
44 Packing
45 Torso
451, 452 Sub fuselage member
46 Crown, operation buttons, operation pins
47 Switch circuit
48 Through hole
49 Interstitial materials, insulating materials
50 Rising part
51 space
52 Screw mechanism
54 Eddy current
56 Joints contained within a sector area
57 Fan-shaped area
60 Joints formed intermittently in the gaps in the sector area

Claims (5)

Radio waves composed of at least an antenna unit, an information processing device for processing information captured by the antenna unit, and a metal exterior unit capable of housing the antenna unit and the information processing device therein In the modified wristwatch , the metal exterior part is composed of a body member and a back cover member, a joint part is formed on a joint surface between the body member and the back cover member, and both ends of the magnetic core part of the antenna part A radio-controlled wristwatch characterized in that an interposing member made of an insulating member is disposed at the joint portion included in a region formed by respective lines connecting the central portion of the body member and the body member. The radio wave correction wristwatch according to claim 1, wherein the insertion member is a film body. The radio wave correction wristwatch according to claim 2, wherein the film body is formed by performing a surface treatment and / or a curing treatment. The radio-controlled wristwatch according to claim 3, wherein the surface treatment is formed by one method selected from a wet plating method, a dry plating method, and a heat treatment. 2. The radio wave correction wristwatch according to claim 1, wherein the interposition member is constituted by one selected from the group consisting of resin, rubber (organic matter), ink, and paint.

Images