JP5800199B2 - Radio receiver and radio clock - Google Patents

Description

  The present invention relates to a radio wave receiving apparatus and radio wave clock equipped with an antenna such as a radio wave wristwatch, a mobile phone, and a portable information terminal.

  For example, in a radio-controlled wristwatch, as described in Patent Document 1, a watch glass is attached to an upper opening of a metal watch case, and a metal back cover is attached to the lower opening of the watch case. The thing of the structure which has arrange | positioned the timepiece module provided with the antenna in the case is known.

JP 2004-343625 A

  However, in such a radio-controlled wristwatch, the side and bottom surfaces of the antenna are covered with a thick metal, so that the reception sensitivity of the antenna is greatly reduced. In particular, in a small wristwatch such as a female wristwatch, there is a problem that sufficient reception sensitivity cannot be obtained because the antenna and the inner surface of the metal wristwatch case are close to each other. In addition, if the metal watch case and the metal back cover are in contact with each other, eddy currents are generated in the watch case and the back cover by the magnetic flux generated from both ends of the antenna magnetic core. Unless an insulating member is provided between the watch case and the back cover in order to prevent the generation of eddy current, there is a problem that the reception performance of the antenna cannot be ensured.

  The problem to be solved by the present invention is that sufficient reception sensitivity can be obtained even when a metal watch case and a metal back cover are used, and that the insulation between the metal watch case and the metal back cover is obtained. It is also possible to provide a radio wave receiver and radio wave clock that can be easily performed.

The present invention includes a cylindrical case, a radio wave transmitting member that closes one end opening of the case, a metal lid member that closes the other end opening of the case, and an antenna disposed in the case. In the radio wave receiving apparatus, the case includes a metal outer case and a synthetic resin inner case disposed inside the outer case, and the inner case is formed on an inner wall surface of the outer case. In addition , the radio wave receiving apparatus is characterized in that the outer case and the lid member are electrically insulated by the inner case, which are joined via a large number of nanometer-sized uneven portions .

  According to the present invention, since the antenna can be sufficiently separated from the metal outer case by the synthetic resin inner case disposed inside the metal outer case, the receiving sensitivity of the antenna can be improved. . Further, the inner case made of synthetic resin can prevent the metal outer case and the metal lid member from contacting each other, and without using an insulating member as a separate part, Can be electrically insulated.

1 is an enlarged front view showing an embodiment in which the present invention is applied to a wristwatch. FIG. 2 is an enlarged back view showing a state where a back cover is removed from the wristwatch shown in FIG. It is an expanded sectional view of the principal part in the AA arrow of the wristwatch shown in FIG. It is an expanded sectional view of the principal part in the BB arrow of the wristwatch shown in FIG. FIG. 5 is a cross-sectional view of a main part in which the joint portion between the watch case and the back cover is further enlarged in the watch shown in FIG. FIGS. 5A and 5B show modified examples of the protruding portion at the joint between the watch case and the back cover shown in FIG. 5, and FIG. 5A is an enlarged cross-sectional view of the main portion showing a first modified example of the protruding portion; FIG. 9 is an enlarged cross-sectional view of a main part showing a second modification of the protruding portion.

Hereinafter, an embodiment in which this invention is applied to a wristwatch will be described with reference to FIGS.
As shown in FIG. 1, the wristwatch includes a wristwatch case 1. A crown 2 is provided on the wristwatch case 1 at 3 o'clock side, and pushbutton switches 3 are provided on the wristwatch case 1 at 2 o'clock side, 4 o'clock side, and 9 o'clock side, respectively. Band attachment portions 4 are provided on the 12 o'clock side and 6 o'clock side of the watch case 1, respectively.

  In this case, as shown in FIGS. 1 to 3, the watch case 1 is provided on the case main body 5, the metal bezel 6 provided on the upper portion of the case main body 5, and the inner upper portion of the bezel 6. An upper parting member 7a made of a synthetic resin and a lower parting member 7b made of a synthetic resin provided at the inner lower part of the bezel 6 are provided. As shown in FIG. 3, the case body 5 includes a metal outer case 8 and a synthetic resin inner case 9 disposed inside the outer case 8.

  In this case, as shown in FIGS. 3 and 4, the outer case 8 is formed so as to protrude inward so that the upper portion covers the upper portion of the inner case 9. The metal bezel 6 is formed with a ring-shaped fitting portion 6a that protrudes downward from the lower surface of the metal bezel 6 that is fitted to an inner peripheral portion located above the metal outer case 8. Further, a glass mounting portion 6 b is provided on the upper portion of the fitting portion 6 a in the bezel 6.

  As a result, the bezel 6 has a packing 10 on the upper portion of the outer case 8 by fitting the fitting portion 6a on the lower surface thereof into the inner peripheral portion of the upper portion of the outer case 8, as shown in FIGS. It is comprised so that it may attach via. The upper parting member 7a is adhered to the glass mounting part 6b of the bezel 6 with an adhesive or an adhesive tape (both not shown), and the lower parting member 7b is located on the inner peripheral side of the bezel 6. It is bonded to the lower surface with an adhesive or an adhesive tape (both not shown).

  Further, as shown in FIGS. 1 and 3, a watch glass 11 that transmits radio waves is attached to the upper opening of the watch case 1 through a packing 11a. A back cover 12 made of metal is attached via a waterproof packing 12a. Further, a watch module 13 is arranged inside the watch case 1 as shown in FIGS.

  In this case, as shown in FIG. 3, the watch glass 11 is fitted into the glass mounting portion 6 b of the bezel 6 of the watch case 1 via the packing 11 a so that the upper parting member 7 is placed in the glass mounting portion 6 b of the bezel 6. The watch case 1 is attached to the watch case 1 while being pressed against the watch case. The timepiece module 13 includes a housing 14. As shown in FIGS. 2 and 3, various components necessary for the timepiece function such as an antenna 15, a circuit board 16, and a battery 17 are mounted on the housing 14.

  As shown in FIG. 3, the antenna 15 is a bar antenna in which a coil 15b is wound around a core 15a. The antenna 15 is arranged on a circuit board 16 located on the 12 o'clock side in the wristwatch case 1 and is configured to receive a standard radio wave including time data. In this case, the antenna 15 is arranged so that the distance (K) to the metal outer case 8 is sufficiently long even when the antenna 15 is close to the inner case 9 made of synthetic resin.

  Further, as shown in FIG. 3, a magnetic member 19 for improving the receiving sensitivity of the antenna 15 is provided on the upper surface of the metal back cover 12 corresponding to the antenna 15. As shown in FIG. 4, the back cover 12 is attached to the lower surface of the watch case 1 by a screw member 18. That is, as shown in FIGS. 2 and 4, a screw hole 20 is provided on the lower surface of the outer case 8 in the case body 5 of the watch case 1, and a screw insertion hole 21 is formed in the back cover 12 with a screw hole. 20 in a state corresponding to 20 in the vertical direction.

  As shown in FIG. 4, the screw member 18 has a head portion 18a and a screw portion 18b. In the screw member 18, the screw portion 18 b is screwed into the screw hole 20 of the outer case 8 from the lower side of the back cover 12 through the screw insertion hole 21 and tightened, so that the head 18 a attaches the back cover 12 to the outer case 8. It is configured to be attached in a state where it is pressed toward.

  By the way, as shown in FIGS. 3 to 5, the case body 5 of the wristwatch case 1 has a structure in which a synthetic resin inner case 9 is joined to a metal outer case 8 by nanometer technology. That is, on the inner wall surface of the outer case 8, a large number of nanometer-sized uneven portions 22 are formed. The inner case 9 is integrally formed on the inner wall surface of the outer case 8 by insert molding. Here, the nanometer size refers to a size of 10 to 300 nanometers (hereinafter referred to as nm).

  In the case of this embodiment, the diameter of the ultrafine holes of the large number of concave and convex portions 22 is a hole diameter having a size of 10 to 100 nm, for example, a hole diameter having a size of 20 to 300 nm and 20 to 30 nm. Further, the depth of the ultrafine holes of the large number of uneven portions 22 is about 20 nm. Further, the synthetic resin for injection molding of the inner case 9 is molded by biting into a large number of nanometer-sized uneven portions 22 formed on the inner wall surface of the outer case 8.

  Further, as shown in FIG. 5, a mounting groove 23 in which the waterproof packing 12a is mounted is formed in an annular shape on the lower surface of the inner case 9. The mounting groove 23 is arranged in a state where a part of the lower side of the waterproof packing 12a protrudes downward from the inside of the mounting groove 23, and a part of the protrusion protruding downward presses the upper surface of the back cover 12. It is configured.

  Further, as shown in FIG. 5, a projecting portion 24 that projects downward from the lower surface of the outer case 8 is formed in an annular shape on the lower surface of the inner case 9. In this case, the protrusion 24 is provided at a position located on the outer peripheral side (left side in FIG. 5) with respect to the mounting groove 23 on the lower surface of the inner case 9. Further, the protrusion 24 has a slight gap (S), for example, about 0.1 mm, between the lower surface of the outer case 8 and the upper surface of the back cover 12 when the back cover 12 is attached to the outer case 8. It is formed so as to ensure a gap (S).

  That is, as shown in FIG. 4, when the back cover 12 is fastened and attached to the lower surface of the outer case 8 by the screw member 18, the case main body 5 has the waterproof packing 12a as shown in FIG. While being compressed and arranged between the case 9 and the back cover 12, the protrusion 24 of the inner case 9 is pressed against the upper surface of the back cover 12, and between the lower surface of the outer case 8 and the upper surface of the back cover 12. By forming a slight gap (S), the outer case 8 and the back cover 12 are electrically insulated.

  Further, as shown in FIG. 2, a position restricting projection 25 for restricting the rotational position of the timepiece module 13 is formed on the inner surface of the inner case 8 made of synthetic resin. The position restricting protrusions 25 are formed at locations corresponding to 12 o'clock and 6 o'clock on the inner surface of the inner case 8. The position restricting protrusion 25 is configured to restrict the position of the watch module 13 in the rotation direction in the watch case 1 by engaging with a position restricting recess 14 a provided on the outer peripheral surface of the housing 14 of the watch module 13. Has been.

Next, a case where the case body 5 of the wristwatch case 1 is manufactured will be described.
In this case, the case body 5 of the watch case 1 includes an outer case 8 made of metal and an inner case 9 made of synthetic resin. For this reason, here, first, each material of the metal outer case 8 and the synthetic resin inner case 9 of the case body 5 will be described.

  The metal outer case 8 is made of a metal such as stainless steel, titanium, brass, aluminum, magnesium, or an alloy containing at least one of these metal elements. The inner case 9 made of synthetic resin is formed of synthetic resin such as polyphenylene sulfide (PPS), polybutylene terephthalate (PBT), polyamide (PA), polyphthalamide (PPA), polyether ketone (PEEK). .

  When joining such an outer case 8 made of metal and an inner case 9 made of synthetic resin, first, the inner peripheral surface of the outer case 8 made of metal is immersed in an alkaline solution to perform a degreasing treatment. Thereafter, the substrate is immersed in an acid solution and neutralized for cleaning. Next, the metallic outer case 8 is immersed in an erodible aqueous solution or erodible suspension to form a large number of nanometer-sized uneven portions 22 on the inner wall surface of the outer case 8.

  At this time, the outer surface of the outer case 8 is covered with a jig, a mask or the like, and only the inner peripheral surface of the outer case 8 is exposed and immersed, so that a large number of nanometer-sized irregularities are formed only on the inner wall surface of the outer case 8. Part 22 is formed. Further, as the erodible aqueous solution or the erodible suspension for forming the large number of uneven portions 22 having a nanometer size, hydrazine, ammonia, water-soluble amines, alkaline earth metal hydroxides, or the like are used. However, it is not limited to this.

  After the outer case 8 is washed with water and dried, an inner case 9 made of synthetic resin is formed on the inner peripheral surface of the outer case 8 by insert molding. At this time, the outer case 8 is placed in an injection mold, and in this state, a synthetic resin for injection molding is injected into the mold. At this time, the inner periphery of the outer case 8 is in a state where the synthetic resin for injection molding injected into the mold bites into a large number of nanometer-sized uneven portions 22 formed on the inner wall surface of the outer case 8. It is integrally formed on the surface.

  Thereby, the synthetic resin inner case 9 is joined to the inner peripheral surface of the metal outer case 8 in a state where the inner case 9 is formed in a predetermined shape by the mold. Thereafter, the mold body is released and the molded product is taken out from the mold, so that the synthetic resin inner case 9 is joined to the inner peripheral surface of the metal outer case 8 and is integrally formed. 5 is obtained.

  Thus, according to this watch, the cylindrical watch case 1, the watch glass 11 that closes the upper opening of the watch case 1 and transmits radio waves, and the metal that closes the lower opening of the watch case 1 are made. A back cover 12 and an antenna 15 disposed in the watch case 1 are provided. The watch case 1 includes a metal outer case 8 and a synthetic resin inner case 9 disposed inside the outer case 8. The inner case 9 is formed with a protruding portion 24 that protrudes below the lower end surface located on the lower opening side of the outer case 8, and the protruding portion 24 allows the outer case 8 and the back cover 12 to be Therefore, the receiving sensitivity of the antenna 15 can be improved without using an insulating member as a separate part.

  That is, in this wristwatch, the metal outer case 8 and the metal back cover 12 are mutually connected by the protruding portion 24 formed in the synthetic resin inner case 9 disposed inside the metal outer case 8. Contact can be prevented. For this reason, the outer case 8 and the back cover 9 can be electrically insulated without using an insulating member as a separate part. Further, the antenna 15 can be separated from the metal outer case 8 with a sufficient distance (K) by the radial thickness of the inner case 8 made of synthetic resin, so that an eddy current is generated in the metal outer case 8. It is possible to suppress this, and the reception sensitivity of the antenna 15 can be improved.

  Further, in this wristwatch, the case body 5 of the watch case 1 has a configuration in which the inner case 9 made of synthetic resin is arranged on the inner surface of the metal outer case 8, so that the volume of the metal portion of the case body 5 is reduced to the inner case. 9 can greatly reduce this. Thereby, since the weight of the watch case 1 can be reduced, the weight of the entire watch case 1 can be reduced, and the metallic appearance can be maintained by the metal outer case 8 even if the weight is reduced. Therefore, it is possible to obtain a high-grade design.

  In this case, since the protrusion 24 of the inner case 9 protrudes downward from the lower surface of the outer case 8 and is formed annularly on the lower surface of the inner case 9, the back cover 12 is attached to the outer case 8. When this is done, a slight gap (S), for example, a gap (S) of about 0.1 mm, can be secured between the lower surface of the outer case 8 and the upper surface of the back cover 12. The back cover 9 can be reliably and well insulated. In this case, the protrusion 24 is provided on the lower surface of the inner case 9 on the outer peripheral side of the mounting groove 23, so that the protrusion 24 can waterproof the watch case 1 and the back cover 12. Can be improved.

  Further, the inner case 9 made of synthetic resin is joined to the outer case 8 made of metal by being joined via a large number of nanometer-sized uneven portions 22 formed on the inner wall surface of the outer case 8 made of metal. The inner case 9 made of synthetic resin can be reliably and firmly integrally formed on the inner wall surface. That is, the nanometer-sized large number of uneven portions 22 has a size of 10 to 100 nm. By immersing the metal outer case 8 in an erodible aqueous solution or an erodible suspension, the nanometer-sized uneven portions 22 can be easily obtained. A large number of irregularities 22 can be formed on the inner wall surface of the metallic outer case 8.

  Further, when the synthetic resin inner case 9 is joined to the metal outer case 8, the outer case 8 is placed in an injection mold, and in this state, the synthetic resin for injection molding is made of gold. The outer case is injected into the mold, and the synthetic resin for injection molding injected into the mold is bitten into a large number of nanometer-sized irregularities 22 formed on the inner wall surface of the outer case 8. The inner case 9 can be securely and firmly joined to the inner wall surface of the eight and formed integrally. For this reason, the barrier property in the junction part of metal outer case 8 and synthetic resin inner case 9 can be improved, and waterproofing resistance can be improved.

  Further, in this wristwatch, the waterproof packing 12 a is disposed between the inner case 9 and the back cover 12, so that the waterproof property between the watch case 1 and the back cover 12 can be secured. That is, when the waterproof packing 12a is disposed in the mounting groove 23 formed in an annular shape on the lower surface of the inner case 9, a part of the lower side of the waterproof packing 12a protrudes downward from the mounting groove 23. In addition, the part protruding downward is pressed against the upper surface of the back cover 12, so that the space between the watch case 1 and the back cover 12 can be reliably waterproofed.

  In this case, when the waterproof packing 12 a is disposed in the mounting groove 23 of the inner case 9, a part of the lower side of the waterproof packing 12 a is lower than the protruding portion 24 of the inner case 9 from within the mounting groove 23. Due to the protrusion, when the back cover 12 is attached to the lower surface of the case body 5 of the watch case 1, after the part of the lower side of the waterproof packing 12 a contacts the back cover 12, the protrusion 24 of the inner case 9 Since it is pressed against the back cover 12, the waterproof packing 12 a can be reliably pressed against the back cover 12.

  Further, this wristwatch includes the screw member 18 that is a fastening member for fixing the back cover 12 to the outer case 8, so that the back cover 12 can be reliably fixed to the outer case 8 by the screw member 18. That is, the screw member 18 has a head portion 18a and a screw portion 18b, and the screw portion 18b is screwed into the screw hole 20 of the outer case 8 through the screw insertion hole 21 of the back cover 12 to be tightened. Since the part 18 a can be attached by pressing the back cover 12 toward the outer case 8, the back cover 12 can be securely fixed to the outer case 8.

  In this case, when the back cover 12 is attached to the lower surface of the outer case 8 by being tightened by the screw member 18, the waterproof packing 12 a is reliably compressed in a state of being compressed between the inner case 9 and the back cover 12. The protrusions 24 of the inner case 9 can be brought into contact with the upper surface of the back cover 12 and the slight gap (S between the lower surface of the outer case 8 and the upper surface of the back cover 12 can be achieved. The outer case 8 and the back cover 12 can be reliably and well electrically insulated.

  Furthermore, according to this wristwatch, the wristwatch case 1 has a configuration in which the inner case 9 made of synthetic resin is arranged on the inner surface of the outer case 8 made of metal, so that when the inner case 9 made of synthetic resin is injection-molded. At the same time, the position restricting protrusion 25 for restricting the position of the timepiece module 13 can be easily and easily formed on the inner surface of the inner case 9. For this reason, the watch module 13 can be accurately positioned in the watch case 1 without using a synthetic resin inner frame.

  That is, the position restricting protrusion 25 formed on the inner case 9 may be engaged with the position restricting recess 14 a provided on the outer peripheral surface of the housing 14 of the timepiece module 13. It is not necessary to provide a synthetic resin inner frame for forming the position restricting projection 25 on the watch case, and the position of the watch module 13 in the watch case 1 can be accurately and easily restricted by the position restricting protrusion 25 of the inner case 9. it can.

  In the above-described embodiment, the case where the projecting portion 24 of the inner case 9 is provided at a position located on the outer peripheral side of the waterproof packing 12a on the lower surface of the inner case 9 is described. You may form like the 1st modification shown to (a), or the 2nd modification shown in FIG.6 (b).

  That is, the protrusion 26 of the first modification shown in FIG. 6A is provided at a location located on the inner peripheral side (the right side in FIG. 6A) of the lower surface of the inner case 9 with respect to the waterproof packing 12a. It may be. Even if the protruding portion 26 is formed in this way, a gap (S) is formed between the outer case 8 and the back cover 12 to ensure insulation between the outer case 8 and the back cover 12 as in the above-described embodiment. In addition, even if water that has entered from the outside of the watch case 1 leaks from the waterproof packing 12a, the leaked water can be prevented from entering the inner case 9 by the protrusion 26.

  Moreover, the structure provided in the location located in both the outer side and the inner side of the waterproof packing 12a in the lower surface of the inner case 9 may be sufficient as the protrusion part 27 of the 2nd modification shown in FIG.6 (b). If comprised in this way, since a clearance gap (S) can be reliably formed between the outer case 8 and the back cover 12 by a pair of protrusion part 27 formed in the lower surface of the inner case 9, implementation mentioned above The outer case 8 and the back cover 12 can be electrically insulated more reliably and better than the form.

  In this case, according to the pair of projecting portions 27 in the second modified example, water entering from the outside of the watch case 1 can be waterproofed by the projecting portions 27 located on the outside, and water is further introduced inward from the waterproof packing 12a. Even if water leaks, the leaked water can be waterproofed by the projecting portion 27 located on the inner side, so that the waterproof property can be further ensured as compared with the embodiment described above.

  Further, in the above-described embodiment, a large number of nanometer-sized uneven portions 22 are formed on the inner wall surface of the metal outer case 8, and the inside of the metal outer case 8 is formed by the large number of nanometer-sized uneven portions 22. Although the case where the synthetic resin inner case 9 is joined to the wall surface has been described, the present invention is not limited to this. For example, the inner case 9 made of synthetic resin is bonded to the inner wall surface of the metal outer case 8 with an adhesive. The inner case 9 made of synthetic resin may be integrated with the inner wall surface of the metal outer case 8 by insert molding without forming a large number of nanometer-sized uneven portions 22 on the inner wall surface of the outer case 8. The formed structure may be sufficient.

  In the above-described embodiment, the case where the metal back cover 12 is attached to the metal outer case 8 of the case main body 5 by the screw member 18 is described. It may be a fastening member having a configuration in which a screw portion is formed in an annular shape on the upper surface and a screw hole into which a screw portion of the back cover 12 is screwed is formed in the lower surface of the metal outer case 8.

  Furthermore, in the above-described embodiment and each modification thereof, the case where the present invention is applied to a wristwatch has been described. However, the present invention is not necessarily a wristwatch. In addition, it is not always necessary to be a watch, and can be widely applied to radio wave receiving devices having an antenna such as a mobile phone and a portable information terminal.

As mentioned above, although one Embodiment of this invention was described, this invention is not restricted to this, The invention described in the claim and its equal range are included.
The invention described in the claims of the present application will be appended below.

(Appendix)
The invention according to claim 1 is disposed in the case, a cylindrical case, a radio wave transmitting member that closes one end opening of the case, a metal lid member that closes the other end opening of the case, and the case. In a radio wave receiving device equipped with an antenna
The case has an outer case made of metal and an inner case made of synthetic resin disposed inside the outer case, and the outer case and the lid member are electrically insulated by the inner case. It is a radio wave receiving device characterized by.

  According to a second aspect of the present invention, in the radio wave receiving device according to the first aspect, the inner case is formed with a protruding portion that protrudes from an end face located on the other end opening side of the outer case. In the radio wave receiving apparatus, the outer case and the lid member are electrically insulated by a protruding portion.

  According to a third aspect of the present invention, in the radio wave receiving device according to the first or second aspect, the inner case passes through a number of nanometer-sized uneven portions formed on the inner wall surface of the outer case. The radio wave receiving device is characterized by being joined.

  The invention according to claim 4 is the radio wave receiving device according to any one of claims 1 to 3, wherein a packing is disposed between the inner case and the lid member. It is a receiving device.

  According to a fifth aspect of the present invention, in the radio wave receiving device according to any one of the first to fourth aspects, the radio wave receiving device includes a fastening member that fixes the lid member to the outer case. Equipment.

  A sixth aspect of the present invention is the radio wave receiving device according to any one of the first to fifth aspects of the present invention, in order to regulate the position of the module on which the antenna is mounted on the inner surface of the synthetic resin inner case. The radio wave receiving device is characterized in that a position restricting portion is formed.

The invention according to claim 7 is a cylindrical watch case, a watch glass that closes an upper opening of the watch case and transmits radio waves, a metal lid member that closes a lower opening of the watch case, In a radio-controlled timepiece having an antenna arranged in the watch case,
The watch case has a metal outer case and a synthetic resin inner case disposed inside the outer case, and the outer case and the lid member are electrically insulated by the inner case. This is a radio timepiece characterized by that.

DESCRIPTION OF SYMBOLS 1 Watch case 5 Case main body 8 Metal outer case 9 Synthetic resin inner case 11 Watch glass 12 Metal back cover 12a Waterproof packing 13 Watch module 15 Antenna 18 Screw member 22 Many uneven parts 24 of nanometer size 24, 26, 27 Projection 25 Position restriction projection

Claims (6)

A cylindrical case,
A radio wave transmitting member that closes one end opening of the case;
A metal lid member closing the other end opening of the case;
In a radio wave receiving device including an antenna disposed in the case,
The case includes a metal outer case, and an inner case made of synthetic resin disposed inside the outer case ,
The inner case is joined through a number of nanometer-sized irregularities formed on the inner wall surface of the outer case,
A radio wave receiving apparatus, wherein the outer case and the lid member are electrically insulated by the inner case.   2. The radio wave receiving device according to claim 1, wherein the inner case is formed with a protruding portion that protrudes from an end surface of the outer case that is positioned on the other end opening side, and the outer case and the lid are formed by the protruding portion. A radio wave receiving device characterized in that a member is electrically insulated. The radio receiving apparatus according to any one of claims 1 to 2, the radio wave reception device, characterized in that the packing is arranged between the lid member and the inner casing. The radio receiving apparatus according to any one of claims 1 to 3, radio receiving device, characterized in that it comprises a fastening member for fixing the lid member to the outer casing. The radio receiving apparatus according to any one of claims 1 to 4, the inner surface of the inner case made of the synthetic resin, the position regulating portion for regulating the position of the module with the antenna are formed A radio wave receiver characterized by that. A cylindrical watch case,
A watch glass that closes the upper opening of this watch case and transmits radio waves;
A metal lid member for closing the lower opening of the watch case;
A radio timepiece comprising an antenna disposed in the watch case,
The watch case includes a metal outer case and a synthetic resin inner case disposed inside the outer case ,
The inner case is joined through a number of nanometer-sized irregularities formed on the inner wall surface of the outer case,
A radio timepiece characterized in that the outer case and the lid member are electrically insulated by the inner case.

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