JP2002345517A - Wristwatch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure a sufficient strength and airtightness against an external force such as bending and twisting. SOLUTION: A harder topside member 3 is arranged on the topside of a band 1 made of a soft synthetic resin having flexibility in a manner that covers the upper side of a module storage hole 2, a harder rear lid 4 is arranged on the underside of the band 1 in a manner that covers the under side of the module storage hole 2, by inserting a screw 5 into a screw insertion hole 18 of the rear lid 4 and threading into a screw hole 15 of a mounting boss 14 of a topside member 3, the topside member 3 and the rear lid 4 are joined by the screw 5. Therefore, the band 1 can be reliably pinched by the topside member 3 and the rear lid 4, even if an external force such as bending or twisting is applied to the vicinity of the module storage hole 2 of the band 1, the topside member 3 harder than the band 1 and the rear lid 4 provides a sufficient strength, and can secure the airtightness of the module storage hole 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wristwatch,
More specifically, the present invention relates to a wristwatch integrated with a watch band.

[0002]

2. Description of the Related Art Conventionally, wristwatches have been demanded to be smaller and thinner, and accordingly, a wristwatch band integrated type in which a watch case and a watchband are integrally formed has been developed. As this type of wristwatch, a flexible synthetic resin top sheet and a flexible synthetic resin bottom sheet are overlapped, and a timepiece module is sandwiched between these sheets. There is a structure in which a sheet and a lower sheet are joined. In this case, the upper sheet and the lower sheet each include a band portion and a module storage recess for storing the watch module, and the module storage recess of the top sheet has a transparent window through which the display of the watch module can be seen from the outside. Is provided.

[0003]

However, such a wristwatch has a structure in which a top sheet made of a synthetic resin having flexibility and a bottom sheet made of a synthetic resin having flexibility are overlapped and joined. Therefore, if sufficient strength is not obtained and an external force such as bending or twisting is applied to the vicinity of the watch module, there is a concern that the watch module may be broken or the module storage recess may have poor airtightness. An object of the present invention is to ensure sufficient strength and airtightness even when an external force such as bending or twisting is applied.

[0004]

According to a first aspect of the present invention, there is provided a wristwatch including a synthetic resin band having a module storage hole formed thereon, and a band disposed on an upper surface of the band to cover an upper side of the module storage hole. An upper member that is harder than the band and a back cover that is disposed on the lower surface of the band and that is harder than the band that covers the lower side of the module storage hole,
The band is sandwiched between the upper surface member and the back cover by fastening the upper surface member and the back cover. According to the present invention, a harder upper surface member is disposed on the upper surface of the synthetic resin band so as to cover the upper side of the module housing hole, and a harder back cover is provided on the lower surface of the band below the module housing hole. The band is sandwiched between the upper surface member and the back cover, and the band is held between the upper surface member and the back cover. Sufficient strength and airtightness can be ensured by the harder top member and the back cover.

In this case, a mounting portion having a screw hole is formed on the lower surface of the upper member so as to protrude toward the lower surface of the band, and a screw is inserted into the back cover. A screw insertion hole is provided corresponding to the mounting portion, and the screw is screwed into the screw hole of the mounting portion from the lower side of the back cover through the screw insertion hole, so that the upper surface member and the back surface are removed. With a structure for fastening the lid, the band can be securely and firmly held between the upper surface member and the back lid, and can be easily disassembled by removing the screw. Further, as described in claim 3, a swaging portion is formed on the lower surface of the upper surface member so as to protrude toward the lower surface side of the band, and the back cover is provided with an insertion hole through which the swaging portion is inserted. By caulking the caulking portion by inserting the caulking portion into the insertion hole of the back cover, if the structure is such that the upper surface member and the back cover are fastened, a band is reliably and securely provided between the upper surface member and the back cover. Can be firmly clamped.

A wristwatch according to a fourth aspect of the present invention
A synthetic resin band with a module storage hole,
An upper surface member fixed to the upper surface of the band and harder than the band covering the upper side of the module storage hole; and a back surface fixed to the lower surface of the band and harder than the band covering the lower side of the module storage hole. And a lid. According to the present invention, a harder upper surface member is fixed to the upper surface of the synthetic resin band so as to cover the upper side of the module storage hole, and a harder back cover is fixed to the lower surface of the band below the module storage hole. As it covers and adheres to the side, even if external force such as bending or twisting is applied to the vicinity of the module storage hole of the band, sufficient strength and airtightness are provided by the upper surface member and back cover that are fixed to the band and are harder than the band Can be secured.

In this case, as described in claim 5, one of the joining surfaces of the band and the upper surface member is provided with a concave groove surrounding the outer peripheral side of the module storage hole, and the other of the joining surfaces is provided. Is provided with a convex portion to be inserted into the concave groove, and by inserting the convex portion into the concave groove, the upper surface member can be positioned with respect to the band, and when attaching the upper surface member to the band, the convex portion is formed. High airtightness can be secured by compressing one of the groove and the groove. Further, as described in claim 6, at least one of the joining surfaces of the band and the back cover is provided with a convex portion surrounding the outer peripheral side of the module storage hole, so that the back cover is attached to the band. At the time of attachment, high airtightness can be secured by compression of the convex portion or bite of the convex portion. Further, as described in claim 7, a projection bent toward the upper surface side of the band is provided on an outer peripheral edge of the back cover, and the projection is fitted to a lower surface of the band. By providing the concave groove, the protrusion of the back cover is inserted into the concave groove of the band, thereby positioning the back cover with respect to the band.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment A first embodiment in which the present invention is applied to an electronic wristwatch will be described below with reference to FIGS. 1 is an external front view of the electronic wristwatch of the present invention, FIG. 2 is a side view thereof, FIG.
4 is an enlarged sectional view taken along the line AA of FIG. 1, and FIG.
6 is an enlarged cross-sectional view taken along the line CC of FIG. 1, and FIG. 7 is an exploded view of FIG. In this electronic wristwatch, a band 1 having a module storage hole 2 formed thereon, an upper surface member 3 disposed on the upper surface of the band 1 so as to cover the upper side of the module storage hole 2, and a lower surface of the band below the module storage hole 2. It has a back cover 4 arranged to cover the side, a screw 5 for fastening the upper surface member 3 and the back cover 4, and a watch module 6 arranged in the module storage hole 2 of the band 1.

The band 1 is made of a flexible synthetic resin such as a polyurethane resin, and has a rectangular module housing hole 2 formed in a substantially middle portion thereof so as to penetrate vertically. At the end of the band 1 at the 12 o'clock side, a buckle 7 for detachably locking the end of the band 1 at the 6 o'clock side is attached. ,
A play ring 8 into which the tip of the band 1 on the 6 o'clock side is removably inserted is slidably mounted. In the band 1 on the 6 o'clock side, locking holes 9 into which the hook bar 7a of the buckle 7 is inserted are provided at regular intervals from the substantially middle portion to the distal end side. Note that the buckle 7 is made of a hard synthetic resin such as a polyacetal resin or a metal such as stainless steel, and the free ring 8 is made of a soft synthetic resin such as a polyurethane resin.

As shown in FIGS. 4 to 7, the upper surface member 3
A frame-shaped bezel portion 10 and a transparent plate 11 mounted on the bezel portion 10, and the bezel portion 10 is disposed in a mounting recess 12 formed on the upper surface of the band 1 at an outer peripheral portion of the module storage hole 2; The transparent plate 11 is the module storage hole 2
It is configured to be mounted on the bezel part 10 while covering the upper side of the bezel. In this case, the bezel 10 is
It is made of a harder material, for example, a hard synthetic resin such as an ABS resin, or a metal such as stainless steel. The transparent plate 11 is made of a transparent synthetic resin such as an acrylic resin or a transparent inorganic glass.
The timepiece module 6 housed inside is configured to be visible from the outside.

By the way, as shown in FIGS. 5 to 7, mounting bosses 14 to be inserted into respective through holes 13 formed in the four corners of the mounting recess 12 of the band 1 are provided on each lower surface at the four corners of the bezel portion 10. Are formed so as to protrude downward, and screw holes 15 are formed in the center of the mounting bosses 14 from the lower end surfaces thereof. As shown in FIGS. 4 and 7, a concave groove 16 is continuously formed on the lower surface of the bezel portion 10 so as to surround the outer peripheral side of the module housing hole 2. In this case, the mounting recess 12 of the band 1
, A convex portion 17 that fits into the concave groove 16 is formed continuously like the concave groove 16. The convex portion 17 is formed to be slightly higher than the depth of the concave groove 16, and the bezel portion 10 is
Is configured to be compressed when attached to the mounting recess 12.

On the other hand, the back cover 4 is made of a material harder than the band 1, for example, a metal such as stainless steel, and is formed in a substantially flat plate shape with a concave portion formed in a portion corresponding to the module housing hole 2. At four corners of the back cover 4, screw insertion holes 18 into which the screws 5 are inserted are formed corresponding to the through holes 13 of the band 1. A projection 19 bent toward the upper surface of the band 1 is continuously provided on the outer peripheral edge of the back cover 4, and a projection 19 is formed on the corresponding lower surface of the band 1. A concave groove 20 to be fitted is provided continuously like the projection 19. Further, on the lower surface of the band 1 corresponding to the flat portion of the peripheral portion of the back cover 4, as shown in FIG. 7, a convex portion 21 is continuously provided so as to surround the outer peripheral side of the module storage hole 2. .

The screw 5 is attached to the mounting recess 1 on the upper side of the band 1.
2, the bezel 10 of the upper surface member 3 is mounted, and the mounting boss 14 of the bezel 10 is inserted into the through hole 13 of the band 1, and the screw insertion hole of the back cover 4 arranged on the lower surface of the band 1 18 is inserted from below into the mounting boss 14.
By screwing into the screw hole 15 and tightening, the upper surface member 3 and the back cover 4 are fastened to sandwich the band 1 between the upper surface member 3 and the back cover 4. The clock module 6
Is provided with various electronic components necessary for displaying information such as time, and is configured to have at least one of an analog display function and a digital display function.

When assembling such an electronic wristwatch, a transparent plate 11 is mounted on the bezel 10 in advance to form the upper member 3, and the bezel 10 of the upper member 3 is attached to the mounting recess on the upper surface of the band 1. 12 is arranged. At this time, the respective mounting bosses 14 provided on the lower surface of the bezel portion 10 are inserted into the respective through holes 13 of the band 1, and the convex portions 17 on the mounting concave portion 12 are inserted into the concave grooves 16 provided on the lower surface of the bezel portion 10. Insert. Thereby, the upper surface member 3 is positioned at a predetermined position on the upper surface side of the band 1 in a state where the upper surface member 3 covers the upper side of the module storage hole 2 of the band 1.

The watch module 6 is housed in the module housing hole 2 of the band 1, and the back cover 4 is mounted on the lower surface of the band 1.
Place. At this time, the back cover 4 covers the lower side of the module housing hole 2 of the band 1 by inserting the projection 19 provided on the peripheral edge of the back cover 4 into the concave groove 20 provided on the lower surface of the band 1. The band 1 is positioned at a predetermined position on the lower surface of the band 1 so that each screw insertion hole 1
8 corresponds to each through hole 13 of the band 1. In this state,
The screw 5 is inserted into the screw insertion hole 18 of the back cover 4 from the lower side of the back cover 4, and the screw 5 is screwed into the screw hole 15 of the mounting boss 14 of the bezel portion 10 to be tightened.
And the back cover 4 are fastened with screws 5, and the band 1 is sandwiched between the upper surface member 3 and the back cover 4.

At this time, since the convex portion 17 of the band 1 inserted into the concave groove 16 of the bezel portion 10 is slightly higher than the depth of the concave groove 16, the convex portion 17 is compressed in the concave groove 16, thereby The airtightness between the module housing hole 2 and the upper surface member 3 is ensured. At the same time, the flat portion at the periphery of the back cover 4 presses and compresses the convex portion 21 provided on the lower surface of the band 1, so that the airtightness between the module storage hole 2 of the band 1 and the back cover 4 is secured. At the same time, the protrusion 19 on the outer peripheral edge of the back cover 4 cuts into the concave groove 20 of the band 1, so that the airtightness between the module storage hole 2 of the band 1 and the back cover 4 is also ensured.

As described above, according to this electronic wristwatch, the upper surface member 3 which is harder than the band is disposed on the upper surface of the band 1 made of a soft synthetic resin having flexibility so as to cover the upper side of the module housing hole 2. Then, a harder back cover 4 is arranged on the lower surface of the band 1 so as to cover the lower surface of the module housing hole 2, and in this state, the screw 5 is inserted into the screw insertion hole 18 of the back cover 4 from below. Then, it is screwed into the screw hole 15 of the mounting boss 14 of the upper surface member 3 and tightened.
And the back cover 4 are fastened with the screws 5, so that the band 1 can be securely and firmly held between the upper surface member 3 and the back cover 4. For this reason, the module storage hole 2 of the band 1
Even when an external force such as bending or twisting is applied to the vicinity of the band, sufficient strength can be ensured by the upper surface member and the back cover 4 which are harder than the band 1, and the module housing hole 2 can be secured.
Airtightness can also be ensured. In addition, since the screw 5 can be easily disassembled by loosening and removing the screw 5, repair and maintenance can be easily performed.

In the first embodiment, the upper member 3
The case where the concave groove 16 is provided on the lower surface of the bezel portion 10 and the convex portion 17 is provided on the mounting concave portion 12 of the band 1 has been described, but the present invention is not limited to this. For example, as in a first modification shown in FIG. The convex portion 25 is continuously provided on the lower surface of the bezel portion 10 so as to surround the module housing hole 2, and the mounting concave portion 12 of the band 1 is provided.
May be provided with a concave groove 26 into which the convex part 25 of the bezel part 10 is inserted. Also in this case, the projection 25 of the bezel 10
Is desirably formed slightly longer than the depth of the concave groove 26 of the band 1. According to such a structure, when the upper surface member 3 and the back cover 4 are fastened and fastened with the screw 5, the convex portion 25 of the bezel portion 10 becomes the concave groove 26 of the band 1.
Since it digs into the inside, airtightness can be ensured as in the first embodiment.

In the first embodiment, the convex portion 21 provided on the lower surface of the band 1 is configured to be pressed and compressed by the flat portion of the peripheral portion of the back cover 4, but the present invention is not limited to this. For example, as shown in FIG. 9, a concave groove 27 into which the convex portion 21 of the band 1 is inserted is provided in a flat portion of a peripheral portion of the back cover 4, and the upper surface member 3 and the back cover 4 are fastened and fastened by screws 5. In such a case, the convex portion 21 of the band 1 may be inserted into the concave groove 27 of the back cover 4 and compressed. Conversely,
The lower surface of the band 1 is formed as a flat surface, and a convex portion is provided on a flat portion of a peripheral portion of the back cover 4.
May be configured to bite into the flat surface of the lower surface of the.

[Second Embodiment] Next, a second embodiment in which the present invention is applied to an electronic wristwatch will be described with reference to FIG. The same parts as those in the first embodiment shown in FIGS. In this electronic wristwatch, a boss 30 for caulking is formed on the lower surface of the bezel portion 10 of the upper member 3, and the boss 30 for caulking is inserted into the insertion hole 31 of the back cover 4 and caulked. A structure in which the bezel portion 10 of the member 3 and the back cover 4 are fastened by the boss portion 30 for caulking, and the band 1 is sandwiched between the upper surface member 3 and the back cover 4. It has almost the same structure as.

In this case, insertion holes 31 are formed at the four corners of the back cover 4 so as to correspond to the respective through holes 13 of the band 1. In addition, the boss 30 for caulking is connected to the bezel 10.
The lower surface of the band 1 is inserted into each of the through holes 13 formed at the four corners of the mounting recess 12 of the band 1, and the lower end thereof is disposed on the lower surface of the band 1. Projecting downward from each insertion hole 31 of the lid 4,
The protruding lower ends are swaged to fasten the bezel 10 and the back cover 4.

In such an electronic wristwatch, the bezel 10
The upper member 3 and the back cover 4 are fastened by the caulking boss portion 30 by inserting the caulking boss portion 30 into the insertion hole 31 of the back cover 4 and caulking. 4
And the band 1 can be securely and firmly held between them. For this reason, as in the first embodiment, even when an external force such as bending or twisting is applied to the vicinity of the module storage hole 2 of the band 1, the upper surface member 3 and the back cover 4, which are harder than the band 1, provide sufficient strength. And the airtightness of the module housing hole 2 can be ensured, and the screw 5 is not used.
The number of parts can be reduced, and a low-cost one can be obtained.

[Third Embodiment] Next, a third embodiment in which the present invention is applied to an electronic wristwatch will be described with reference to FIG. Also in this case, the same parts as those in the first embodiment shown in FIGS.
This electronic wristwatch has a structure in which the bezel portion 10 of the upper surface member 3 is fixed to the mounting concave portion 12 on the upper surface side of the band 1 and the back cover 4 is fixed to the lower surface of the band 1. It has the same structure. That is, the bezel portion 10
And the upper surface of the mounting recess 12 of the band 1
5 fixed. Further, the upper surface of the back cover 4 and the lower surface of the band 1 are fixed by an adhesive 35 as described above. In this case, the peripheral edge of the back cover 4 is formed on a flat surface so as to be in close contact with the lower surface of the band 1.

In such an electronic wristwatch, the bezel portion 10 of the upper surface member 3 is fixed to the mounting recess 12 on the upper surface of the synthetic resin band 1 with an adhesive 35 while covering the upper side of the module housing hole 2. Since the back cover 4 is fixed to the lower surface of the base 1 with the adhesive 35 while covering the lower side of the module housing hole 2, the bonding between the band 1 and the bezel portion 10 and the bonding between the band 1 and the back cover 4 are performed. The airtightness of the module housing hole 2 can be ensured by the adhesives 35 provided between the surfaces, and the bezel portion 10 of the upper surface member 3 can be secured.
And the back cover 4 are formed of a material harder than the band 1, so that even if an external force such as bending or twisting is applied to the vicinity of the module storage hole 2 of the band 1, as in the first embodiment, High strength can be ensured.

In the third embodiment, the upper surface member 3
The joint surface between the bezel portion 10 and the mounting recess 12 of the band 1 is formed on a flat surface, and the joint surface between the outer peripheral portion of the back cover 4 and the lower surface of the band 1 is formed on a flat surface.
However, the present invention is not limited to this. For example, as in a modified example shown in FIG. 12, a convex portion 25 is provided continuously on the lower surface of the bezel portion 10 so as to surround the outer peripheral side of the module storage hole 2, and Groove 2 into which the convex part 25 of the bezel part 10 is inserted
6 may be provided continuously like the convex portion 25,
Also, a structure in which the protrusion 19 is formed continuously on the outer peripheral edge of the back cover 10 and the concave groove 20 into which the protrusion 19 of the back cover 4 is inserted is formed on the lower surface of the band 1 similarly to the protrusion 19 may be formed. good.

According to this structure, the convex portion 25 of the bezel 10 is fitted into the concave groove 26 of the band 1,
Both can be positioned, the bezel 10 and the band 1 can be fixed with the adhesive 35 in this state, and the projection 19 of the back cover 4 can be fitted into the groove 20 of the band 1. Thus, both can be positioned, and in this state, the back cover 4 and the band 1 can be fixed with the adhesive 35. At this time, the convex portion 25 of the bezel portion 10 cuts into the concave groove 26 of the band 1, so that the airtightness between the upper surface member 3 and the module storage hole 2 of the band 1 can be further secured, and the back cover 4 can be secured. The protrusion 19 on the outer peripheral edge of the band bites into the groove 20 of the band 1, so that the airtightness between the back cover 4 and the module storage hole 2 of the band 1 can be further secured.

In the third embodiment and its modification, the joining surface between the bezel portion 10 and the band 1 of the upper surface member 3 and the joining surface between the back cover 4 and the band 1 are fixed with the adhesive 35, respectively. However, the present invention is not limited to this. For example, the joining surface between the bezel portion 10 and the band 1 of the upper surface member 3 and the joining surface between the back cover 4 and the band 1 are fixed by welding using ultrasonic waves or the like. Is also good.

[0028]

As described above, according to the wristwatch of the first aspect of the present invention, a harder upper surface member is disposed on the upper surface of the synthetic resin band so as to cover the upper side of the module housing hole. A lower cover, which is harder than this, is disposed on the lower surface of the band so as to cover the lower side of the module housing hole, and the upper surface member and the back cover are fastened to hold the band between the upper surface member and the back cover. Even if an external force such as bending or twisting is applied to the vicinity of the module storage hole, sufficient strength and airtightness can be ensured by the upper surface member and the back cover which are harder than the band.

In this case, a mounting portion having a screw hole is formed on the lower surface of the upper member, a screw insertion hole for inserting a screw is formed in the back cover, and the screw is passed through the screw insertion hole of the back cover. By screwing the upper surface member and the back cover, the band can be securely and firmly held between the upper surface member and the back cover. Further, by forming a caulking portion on the lower surface of the upper surface member, providing an insertion hole for the caulking portion to be inserted in the back cover, and inserting the caulking portion into the insertion hole of the back cover and caulking, the upper member and the back cover are connected. If fastened, the band can be securely and firmly held between the upper surface member and the back cover.

According to the wristwatch according to the fourth aspect of the invention, a harder upper surface member is fixed to the upper surface of the synthetic resin band so as to cover the upper side of the module housing hole, and is fixed to the lower surface of the band. A harder back cover is fixed by covering the lower side of the module storage hole, so even if external force such as bending or twisting is applied near the module storage hole of the band, the upper surface member fixed to the band and harder than the band With the back cover, sufficient strength and airtightness can be secured.

In this case, a concave groove surrounding the outer peripheral side of the module housing hole is provided on one of the joining surfaces of the band and the upper surface member, and a convex portion is provided on the other of the joining surfaces, and the convex portion is inserted into the concave groove. Thereby, the upper surface member can be positioned with respect to the band, and high airtightness can be secured by compressing one of the convex portion and the concave groove when attaching the upper surface member to the band.
Further, by providing a convex portion surrounding the outer peripheral side of the module storage hole on at least one of the joining surfaces of the band and the back cover, the convex portion is compressed or convex when the back cover is attached to the band. High airtightness can be secured by the bite of the part. Further, a protrusion bent toward the upper surface of the band is provided on the outer peripheral edge of the back cover, and a concave groove for fitting the protrusion on the lower surface of the band is provided. By inserting the back cover into the groove, the back cover can be positioned with respect to the band.

[Brief description of the drawings]

FIG. 1 is an external front view of a first embodiment in which the present invention is applied to an electronic watch.

FIG. 2 is a side view of FIG.

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is an enlarged sectional view taken along the line AA of FIG. 1;

FIG. 5 is an enlarged sectional view taken along the line BB of FIG. 1;

FIG. 6 is an enlarged sectional view taken along the line CC of FIG. 1;

FIG. 7 is an exploded view of FIG. 6;

FIG. 8 is an enlarged cross-sectional view showing a first modification of the first embodiment.

FIG. 9 is an enlarged sectional view showing a second modification of the first embodiment.

FIG. 10 is an enlarged sectional view of a second embodiment in which the present invention is applied to an electronic watch.

FIG. 11 is an enlarged sectional view of a third embodiment in which the present invention is applied to an electronic wristwatch.

FIG. 12 is an enlarged cross-sectional view showing a modification of the third embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 band 2 module storage hole 3 upper surface member 4 back cover 5 screw 10 bezel portion 11 transparent plate 14 mounting boss 15 screw hole 16 bezel portion concave groove 17 band upper surface side convex portion 18 back cover screw insertion hole 19 back cover 20 Groove on the lower side of the band 21 Convex part on the lower side of the band 25 Convex part on the bezel part 26 Groove on the upper side of the band 27 Groove on the back cover 30 Boss part for swaging 31 Back cover insertion Hole 35 adhesive

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takahiro Mochizuki 3-2-1 Sakaemachi, Hamura City, Tokyo Casio Computer Co., Ltd. Hamura Technical Center

Claims (7)

[Claims] 1. A band made of a synthetic resin having a module storage hole, an upper surface member disposed on the upper surface of the band and harder than the band covering the upper side of the module storage hole, and a lower surface of the band. A back cover that is arranged and is harder than the band that covers the lower side of the module storage hole. By fastening the upper surface member and the back cover, the band is separated by the upper surface member and the back cover. A wristwatch characterized by being pinched. 2. A mounting portion having a screw hole is formed on a lower surface of the upper member so as to protrude toward a lower surface of the band, and a screw insertion hole through which a screw is inserted is formed on the back cover. Correspondingly provided, the screw is screwed into the screw hole of the mounting portion through the screw insertion hole from the lower side of the back cover, thereby fastening the upper surface member and the back cover. The wristwatch according to claim 1. 3. A swaging portion is formed on a lower surface of the upper member so as to protrude toward a lower surface of the band.
An insertion hole into which the caulking portion is inserted is provided, and the upper surface member and the back cover are fastened by inserting the caulking portion into the insertion hole of the back cover and caulking. The wristwatch according to 1. 4. A band made of a synthetic resin having a module storage hole, an upper member fixed to the upper surface of the band and harder than the band covering the upper side of the module storage hole, and a lower surface of the band. A wristwatch, comprising: a back cover that is fixed and is harder than the band that covers a lower side of the module storage hole. 5. A concave groove surrounding an outer peripheral side of the module accommodating hole is provided on one of joining surfaces of the band and the upper surface member, and a convex inserted into the concave groove is provided on the other of the joining surfaces. A part is provided.
Watch described in. 6. A projection portion surrounding at least one of the joining surfaces of the band and the back cover, the projection portion surrounding an outer peripheral side of the module storage hole.
Watch described in. 7. An outer peripheral edge of the back cover is provided with a projection bent toward an upper surface of the band, and a lower groove of the band is provided on a lower surface of the band to be fitted with the projection. The wristwatch according to claim 1 or 4, wherein