JP2002253312A - Strap structure and watch and portable electronic device provided with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a strap structure and a watch and portable type electronic device provided with the same, which does not accidentally falls drop even when the fasters attached to a first strap section and a second strap section are not connected. SOLUTION: The first strap section 121 is formed with a crank shaped section with strap material bended, which section is provided with a step portion 121b projecting in the peripheral direction when looked at from the proximal end side (the body 110 side) to the distal end side of the first strap section 121. When the first strap section 121 is passed through into an insertion frame 124a of a buckle 124 mounted on the second strap section 122, the first strap section 121 and the second strap section 122 are prevented from slipping off by being hooked to the insertion frame 124a with the step portion 121b, even when a tongue 124b is not inserted into a locking hole 121a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a band structure and a portable electronic device using the same, and more particularly, to a structure suitable for use in a band portion of a portable watch or a diving computer.

[0002]

2. Description of the Related Art Generally, as a band used for a portable watch such as a wristwatch or a diving computer, a first band portion and a second band portion are connected to both ends of a portable watch body or a diving computer body. In some cases, a plurality of engagement holes are provided in a portion near the tip of the portion, and a beautiful lock is attached as a connecting tool to the tip of the second band portion. The beauty lock is provided with an insertion frame configured to allow a portion of the first band portion near the tip to be inserted, and a protruding bar as a holding and fixing means for engaging with the engagement hole of the first band portion. A play leather is inserted into the second band portion as a penetrating and holding means on the base end side of the beautiful tablet. After the front end of the first band portion is inserted into the insertion frame, the protruding bar is inserted into the engagement hole of the first band portion, whereby the first band portion and the second band portion are held and fixed. By inserting the tip of the band part into the play leather, the tip part of the first band part
It is designed to be held along the band.

[0003]

However, in the above-mentioned conventional band structure, the portable watch main body is placed on the wrist and the beautiful lock attached to the tip of the first band portion and the second band portion. Must be operated with one hand to connect and disconnect the first band portion and the second band portion. Therefore, before connecting the first band portion and the second band portion, or There is a problem that the portable watch is accidentally dropped down after removing the part and the second band part.

[0004] The present invention is not limited to the above watch, dive computers, portable electronic devices such as portable information terminals has a similar problem, furthermore, not limited to the electronic apparatus,
Similar problems exist in various articles such as accessories as long as they have the above-described band structure.

Accordingly, the present invention has been made to solve the above-mentioned problem, and an object of the present invention is to drop the first band portion and the connecting member attached to the second band portion by mistake even when they are not connected. It is an object of the present invention to provide a band structure that does not have any problem, and a portable timepiece and a portable electronic device provided with the band structure.

[0006]

In order to solve the above-mentioned problems, a band structure according to the present invention has a first band portion and a second band portion, and an insertion portion through which a tip of the first band portion is inserted, and A band structure having a holding member having holding and fixing means for holding and fixing a state where the first band portion is inserted through the insertion portion, the band structure being configured to be attached to the second band portion, wherein the second member is inserted through the insertion portion. A step portion is provided in the middle of one band portion.

According to the present invention, since the step portion is formed in the first band portion, when the connection state between the first band portion and a connector such as a beautiful lock is released, or when the first band portion is disconnected. When the part near the tip of the part is inserted through the insertion part and the hand is accidentally released from the first band part and the connection part when trying to connect to the connection part, the insertion part of the connection part is made into the first band. Since the insertion portion can be configured to be hooked on the step portion when trying to get out of the portion, the danger of dropping of the band structure and an article connected to the band structure, if any, can be reduced.

Here, the connecting tool may be any as long as it has an insertion portion and a holding and fixing means, and is not limited to the above-described beautiful lock having the insertion frame and the protruding bar, but may be an insertion frame and a band. A buckle-type connecting member having a narrow banding material (the band narrowing member is rotated and then the band narrow banding material is fixed with a hook or the like. At this time, the first band portion inserted into the insertion frame is used for band narrowing. (A material configured to be tightly attached at a narrow portion of the material).

[0009] In the present invention, the step portion may be formed by the first step.
It is preferable that the band portion is formed so as to protrude toward the outer surface side when viewed in the direction of the tip of the band portion. The insertion part of the connector is the first
When trying to get out of the band, the first band and the second
Since the diameter of the connection structure of the band portion is increasing, the first band portion is often pressed against the outer peripheral side portion of the insertion portion. By being formed so as to protrude, the insertion portion (the outer peripheral side portion) of the coupling tool can be configured to be more reliably hooked on the first band portion.

[0010] In the present invention, the step portion may be formed by the first step.
It is preferably formed by refracting the band portion. How to provide the step portion in the first band portion is optional, but by forming the step portion by refracting the first band portion, the step portion is formed thicker than other portions. Since the necessity is eliminated, it is easy to ensure the flexibility and flexibility of the first band portion. Further, the first band portion can be easily inserted into the insertion portion of the connector or the insertion holding means (for example, play leather) described later. Insertion work becomes easy. In this case, the first band portion has, from the base end side thereof, a first refraction portion that is refracted at a substantially right angle, a second refraction portion that refracts at an acute angle, and a third refraction portion that refracts at an obtuse angle. Is preferred.

In the present invention, it is preferable that the thickness of the step portion is formed to be thinner than a portion other than the step portion of the first band portion. The thickness of the step portion is the first
Since the band portion is formed to be thinner than the portion other than the step portion, the flexibility and flexibility of the first band portion in the vicinity thereof can be enhanced despite the provision of the step portion. In addition, by deforming the stepped portion, the work of inserting the first band portion into the insertion portion of the connector and the insertion holding means described later becomes easier.

In the present invention, it is preferable that the first band portion is made of an elastic material such as a urethane resin, a silicone resin, and a synthetic rubber. According to this means, since the first band portion is made of the elastic body, the step portion can be deformed, so that the first band portion can be easily passed through the insertion portion.

In the present invention, it is preferable that the first band portion is made of a synthetic resin. According to this means, since the first band portion can be freely molded by molding such as injection molding, a step portion having a suitable shape can be easily provided.

In the present invention, it is preferable that a projection is provided near the top of the step. According to this means, since the projection is further provided near the top of the step, the insertion portion of the connecting tool can be more reliably engaged with the step. For example, when the weight of the main body portion to which the first band portion and the second band portion are attached is large, or when the weight of the first band portion and the second band portion is large (for example, a battery such as a battery or an electronic board is attached to the band). When attaching or embedding other components)
Even when stress is applied between the first band portion and the second band portion such that the step portion is deformed due to the weight of the main body portion and the band, the insertion portion once caught by the step portion comes off. And other problems can be prevented. Further, not only in such a case, but also when a person is pulled or when something is caught, a large force may be applied between the first band portion and the second band portion. However, the present invention can withstand a large load by applying the present invention.

In the present invention, it is preferable that the protrusion protrudes from the top of the step to the base end of the band. According to this means, since the protrusion protrudes toward the base end side of the band portion, the protrusion can hold the insertion portion of the connection portion even if the step portion is slightly deformed, so that the connection tool is hooked on the insertion portion. Can be maintained more reliably. More specifically, it is desirable that the protrusion protrudes obliquely outward toward the base end side of the band portion.

In the present invention, the protrusion may be provided at the center in the width direction of the first band portion. Also,
The protrusion may be provided on the entire width direction of the first band portion. Further, a plurality of protrusions may be provided in a width direction of the first band portion.

In the present invention, it is preferable that a groove is provided on the base end side of the band portion of the step portion. In this case, when the insertion portion of the connecting tool is hooked on the step portion,
Part of the insertion portion of the connector enters the groove on the base end side of the band portion of the step portion, so that the actual step amount can be increased, so that the insertion portion can be performed without increasing the step amount of the step portion. Can be reliably engaged.

In the present invention, it is preferable that the groove extends in a band width direction, and both ends in the band width direction are open. According to this means, a groove extending in the band width direction and open at both ends is provided (that is, a groove is provided).
The groove is formed at both ends of the band, and the cross-sectional shape is shown on the end surface.) Therefore, the insertion portion of the connecting tool attached to the second band can be securely engaged with the groove.

In the present invention, the second band portion includes:
In some cases, insertion holding means for inserting and holding the first band portion, for example, play leather, may be provided on the base end side of the band portion with respect to the attachment portion of the connection tool. The first band portion is held by the insertion holding means so as to overlap the second band portion.

Next, a portable timepiece according to the present invention has one of the above-mentioned band structures. As the more specific structure of the watch, there is a case where the first band portion and the second band portion on both sides of the watch main body is attached. Also, a band body in which the first band portion and the second band portion are integrated is attached to the back side of the portable watch body,
Alternatively, the portable watch body and the band body may be integrated.

Next, a portable electronic device according to the present invention has one of the above-mentioned band structures. Examples of the portable electronic device include a diving computer, a mobile phone, and a portable information terminal.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a band structure according to the present invention, a portable timepiece and a portable electronic device using the same will now be described in detail with reference to the accompanying drawings.

[First Embodiment] FIG. 1 is a schematic perspective view showing the entire configuration of a first embodiment according to the present invention. The present embodiment is a diving computer 100 having both a function as a portable timepiece and a function as a portable electronic device for calculating diving information and the like. The diving computer 100 has a main body 110 in which a timepiece, an arithmetic unit, a display, and the like are built in a case body made of metal, synthetic resin, or the like, and a band body 12 attached to the main body 110.
0. The band body 120 can be made of various materials, but the band body in the illustrated example is integrally formed of, for example, a soft resin such as a urethane resin or an elastic resin of a synthetic rubber.

The band body 120 includes a first band portion 121 extending to one side of the main body 110, a second band portion 122 extending to the other side of the main body 110, and a portion between the first band portion 121 and the second band portion 122. And a back mounting portion 123 mounted on the back side of the main body 110 is integrally formed.

The first band portion 121 is formed with a plurality of engaging holes 121a arranged in the extending direction, and a portion formed by bending the band material in a crank shape on the tip side from the engaging holes 121a. Is formed in this portion, and a step portion 121b protruding toward the outer peripheral side of the band body 120 when viewed from the base end side (the main body 110 side) of the first band portion 121 to the distal end side.
Is provided.

On the other hand, the tip 122 of the second band 122
A beautiful lock 124 made of metal, synthetic resin, or the like, having an insertion frame 124a and a protruding rod 124b rotatably attached to the insertion frame 124a is attached to a.
A through-hole penetrating in the width direction of the second band portion 122 is formed at a tip end portion 122a of the second band portion 122, and a mounting shaft 124a3 is inserted into the through-hole.
4a3, the end frame portion 124a1 and the end frame portion 124
A U-shaped member consisting of a pair of side frame portions 124a2 connected to both ends of a1 is attached to constitute the insertion frame 124a. The protruding rod 124b is rotatably attached to a central portion of the attachment shaft 124a3 at a notch formed at the center in the width direction of the distal end portion 122a of the second band portion 122.

Further, the second band portion 122 has a play leather 12 made of a synthetic resin or the like at a base end side (the main body 110 side) of the distal end portion 122a where the beautiful lock 124 is attached.
5 is mounted movably in the extension direction of the second band portion 122.

FIG. 2A shows a portion near the tip of the first band portion 121 and a portion near the tip of the second band portion 122 that are not connected to each other. In the present embodiment, as shown in this figure, the first bending portion 121b1, the second bending portion 121b2,
The third bending portion 121b3 is formed, and the first bending portion 121b is formed.
1 is such that the first band portion 121 is bent almost perpendicularly to the outer peripheral side to form the stepped portion 121b, the second bent portion 121b2 is bent at the top of the stepped portion 121b at an acute angle, and the third bent portion 121b is bent at the second portion. The light is refracted at an obtuse angle at a position farther from the refraction part 121b2 than the step amount of the step part 121b. From the second bending portion 121b2 to the third bending portion 121b3, the first band portion 121 is gently inclined toward the distal end side of the first band portion 121 with respect to other portions in a state where external stress is not applied to the first band portion 121. .

In the first band portion configured as described above, the insertion frame 1 of the connecting member 124 of the second band portion 122
24a, the first band portion 121 is inserted from the tip thereof,
The connecting member 124 is moved beyond the step portion 121b to the first band portion 1
21 to the base end side, and at an appropriate position,
By inserting b into the engagement hole 121a, the first band portion 121 and the second band portion 122 are connected. Here, since the portion from the third bending portion 121b3 to the second bending portion 121b2 forms a gentle slope, the insertion frame 124 is formed.
a can be easily inserted into the first band portion 121. Thereafter, the distal end portion of the first band portion 121 inserted into the insertion frame 124 a is inserted between the play leather 125 and the second band portion 122, so that the distal end portion of the first band portion 121 becomes the second band portion 122. It is held in a posture along.

In the operation of connecting the first band portion 121 and the second band portion 122, the insertion portion 124a
Is inserted through the first band portion 121 until it passes over the step portion 121b, the insertion portion 124a as shown in FIG. Is caught by the step portion 121b, and the insertion portion 124a is prevented from coming off the first band portion, so that the band body is held on the arm 10 as shown in FIG. Is prevented. In FIG. 3, FIG.
The main body 110 shown in FIG.

On the other hand, when the first band portion 121 and the second band portion 122 are connected to each other, the projecting rod 124b is removed from the engaging hole 121a, so that the insertion frame 12 is removed.
When the holding and fixing state of the first band portion 4a with respect to the first band portion 121 is released, the insertion frame 124a moves toward the distal end of the first band portion 121. At this time, since the outer diameter of the band body 120 gradually increases, as shown in FIG. 2B, the end frame portion 124a1 of the insertion frame 124a moves while contacting the first band portion 121, and The contact with the portion 121b prevents further movement. Thereafter, the end frame portion 124a1 of the insertion frame 124a is moved while being separated toward the outer peripheral side of the step portion 121b, whereby the insertion frame 124a is moved to the step portion 12b.
Since the first band portion is separated from the first band portion by overcoming 1b, the first band portion and the second band portion can be separated from each other. Therefore, when the diving computer 100 is detached from the arm, the insertion frame 124a is detached from the first band portion 121 even if the user accidentally releases the hand during the work.
b prevents the dive computer 100 from dropping.

In the present embodiment, the first bent portion 121b1, the second bent portion 121b2, and the third bent portion 121b3 are formed in the middle of the first band portion 121, so that the step portion 12 is formed.
Since the first band portion 1b is formed, it is not necessary to locally increase the thickness of the first band portion 121 in order to form the step portion 121b, and the flexibility and flexibility of the first band portion 121 are ensured. The operability at the time of attaching and detaching the device is improved. Here, the first bending portion 121b1 to the second bending portion 12
Since the thickness of the greatly bent portion up to 1b2 is formed smaller than the thickness of the other portions, the step portion 121b
Is unnecessary (for example, when the insertion frame 124a is inserted into the first band portion 121, or when the insertion frame 124a is
(For example, when passing through the stepped portion 121b to remove the first bent portion 121b1 or the second bent portion 1).
21b2 so that its refraction angle becomes small,
An operation can be performed so that the insertion frame 124a can easily pass through the step portion 121b.

[Second Embodiment] Next, a second embodiment according to the present invention will be described with reference to FIGS. This embodiment relates to a band body of the diving computer 100 which is completely the same as the first embodiment.
The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, as shown in FIG. 4A, the first band portion 121 has the same step portion 1 as described above.
A projection 121c is formed on the top of 21b. The projection 121c is formed integrally with the band body similarly to the step portion 121b. This projection 121c
Is the first band portion 121 at the top of the step portion 121b.
Project obliquely toward the outer peripheral side toward the base end side. In addition, the above-mentioned protrusion should just be fixed to the 1st band part,
For example, sticking and bonding a protrusion made of hard resin or metal,
It may be fixed to the top of the step by welding, insert molding, or the like.

In this embodiment, as shown in FIG. 4B, the insertion portion 124 of the beautiful lock 124 is inserted into the step portion 121b.
a comes into contact with the second band portion 122 and the first band portion 121
In a state where the insertion portion 124a is prevented from coming off, the end frame portion 124a1 of the insertion portion 124a engages with the projection 121c projecting from the top of the step portion 121b, and the insertion portion 124a is connected to the step portion 121b.
Can be reliably prevented from coming off. In particular, by providing the projection 121c, the first band portion 121 is provided.
When the step portion 121b is deformed so that the refraction angle of the first refraction portion 121b1 becomes smaller when the first refraction portion 121b1 and the second band portion 122 are strongly pulled apart from each other, the insertion frame 12
4a is engaged by the projection 121c, so that the first
Unintended separation between the band portion 121 and the second band portion 122 can be prevented.

Further, since the projection 121c of the present embodiment projects obliquely outward from the top of the step portion 121b toward the base end of the band body, even if the step portion 121b is slightly deformed, the protrusion 121c is engaged. Without loss of function
The beautiful lock 124 can be more reliably prevented from coming off the stepped portion 121b of the insertion frame 124a.

As shown in FIG. 5A, the protrusion 121c 'formed at the top of the step portion 121b over the entire band width direction as shown in FIG. 5A, and the band width of the step portion 121b as shown in FIG. The projection 121c ″ is formed only in a part of the direction, more specifically, a projection 121c ″ formed only at the center in the bandwidth direction as shown in the illustrated example, FIG.
As shown in FIG. 5, the step portion 121b is formed at a plurality of positions in the band width direction, more specifically, as shown in the drawing, the protrusions 121c ′ ″ are formed at two positions in the band width direction. Can be formed.

[Third Embodiment] Next, a third embodiment according to the present invention will be described with reference to FIG. This embodiment relates to a band body of the diving computer 100 which is completely the same as the first embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

In this embodiment, as shown in FIG. 6A, a step portion 121b in the first band portion 121 is formed.
A groove 121d is formed on the outer surface on the base end side, facing the step surface of the step portion 121b, extending in the band width direction and opening on both sides in the band width direction. As shown in FIG. 6B, the groove 121d has a width equal to or greater than the width of the end frame portion 124a1 so that the end frame portion 124a1 of the insertion portion 124a of the beautiful lock 124 can be completely accommodated. Further, the groove 121d extends in the band width direction, and both ends thereof are opened so that the cross-sectional shape of the groove 121d is formed on the band end surface.
1 and the side frame portions 124a2 connected to both ends thereof can be securely accommodated in the groove portion 121d.

By forming the groove 121d, the insertion frame 124a engages with the step portion 121b, and when the second band 122 is prevented from coming off from the first band 121, the end frame 124a1 is formed. Is accommodated in the groove 121d, the same effect as in the case where the step amount of the step portion 121b is substantially increased, and the movement of the beautiful lock 124 can be surely prevented by the step portion 121b. It is also possible to reduce the level difference of the portion 121b. The fact that the step amount of the step portion 121b can be reduced in this way means that the insertion frame 124a can more easily pass through the step portion 121b in a normal band attaching / detaching operation. Similarly, the step portion 121b can be easily passed through the play leather 125.

Fourth Embodiment Next, a fourth embodiment according to the present invention will be described with reference to FIG. This embodiment relates to a band body of the diving computer 100 which is completely the same as the first embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

In this embodiment, as shown in FIG. 7A, the same shape of the groove 121 is provided at the same position as in the third embodiment.
d 'is formed, and this groove 121d'
The width is smaller than the groove 121d of the embodiment, and the width is slightly smaller than the width of the insertion frame 124a. Therefore, as shown in FIG. 7B, when the insertion frame 124a engages with the step portion 121b, not all of the end frame portion 124a1 is housed in the groove 121d ', but the end frame portion 124a1.
Is obliquely inserted into the groove 121d '.

Also in this embodiment, the formation of the groove 121d 'has the same effect as increasing the substantial step amount of the step portion 121b with respect to the insertion frame 124a. As a result, it is possible to more reliably prevent the beautiful lock 124 from coming off, and it is also possible to reduce the amount of step of the step portion 121b itself.

[Fifth Embodiment] Finally, a fifth embodiment according to the present invention will be described with reference to FIG. This embodiment also relates to the band body of the diving computer 100 which is completely the same as the first embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals, and their description is omitted.

In this embodiment, the first band 12
As shown in FIG. 8A, a projection 121c similar to the second embodiment and a groove 1 similar to the fourth embodiment are provided.
21d '. In a state where the movement of the insertion portion 124a of the beautiful lock 124 is prevented by the step portion 121b, the insertion frame 124 of the beautiful lock 124 is held in the posture shown in FIG.
a may engage with the step portion 121b and the groove 121d '. In this case, the end frame portion 1 of the insertion frame 124a
Since 24a1 engages with the projection 121c, the insertion frame 124
a is reliably prevented from coming off the step portion 121b. In particular, even when the weight of the main body 110 is large and the second band portion 122 is pulled so as to be strongly separated from the first band portion 121 due to the main body 110 falling down from the arm, the main body 110 does not extend from the step portion 121b of the insertion frame 124a. Detachment is prevented.

It should be noted that the band structure of the present invention and the portable watch and the portable electronic device using the same are not limited to the above-described illustrated examples, and various changes can be made without departing from the scope of the present invention. Of course, it can be added. For example, in the above embodiment, the diving computer 10
However, the present invention is not limited to this, and may be a portable watch such as a normal wristwatch or a pocket watch, or various types of mobile phones, pagers, information terminals, and the like. It may be a portable electronic device.

In the above embodiment, the first band 1
21 and the second band portion 122 constitute a band body 120 integrally connected via a back mounting portion 123, but the present invention is not limited to this, and the first band portion 121 And the second band portion 122 are configured separately,
A structure may be provided in which both are attached to both side surfaces of the portable watch body and the electronic device body.

Further, the band structure of the present invention is not limited to the one worn on the arm as in the above embodiment, but may be a waist, a leg,
It may be for attachment to any body such as the neck, and also for things other than the body, such as bags, clothes,
It may be used for mounting on various articles such as columns.

[0049]

As described above, according to the present invention,
It is possible to prevent the first band portion and the second band portion from unintentionally coming off accidentally when attaching or detaching using the band.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing the appearance of a first embodiment of a portable timepiece or portable electronic device according to the present invention.

FIGS. 2A and 2B are a side view showing a vicinity of a connection portion in a separated state of a first band portion and a second band portion of the first embodiment, and a side view showing a vicinity of a connection portion in an engaged state.

FIG. 3 is a side view showing a state of the band body in an engaged state in the first embodiment.

FIG. 4A is a side view showing the vicinity of a connecting portion in a separated state of a first band portion and a second band portion of a second embodiment according to the present invention, and FIG. )
It is.

FIGS. 5A to 5C are perspective views showing various examples of shapes of protrusions provided on the top of a step portion of a first band portion according to a second embodiment of the present invention.

FIG. 6A is a side view showing the vicinity of a connection portion in a separated state of a first band portion and a second band portion of a third embodiment according to the present invention, and FIG. )
It is.

FIG. 7A is a side view showing the vicinity of a connection portion in a separated state of a first band portion and a second band portion of a fourth embodiment according to the present invention, and FIG. )
It is.

FIG. 8A is a side view showing the vicinity of a connecting portion in a separated state of a first band portion and a second band portion of a fifth embodiment according to the present invention, and FIG. )
It is.

[Description of Signs] 10 arms (wrist) 100 diving computer 110 main body 120 band body 121 first band part 121a engaging hole 121b stepped part 121b1 first bending part 121b2 second bending part 121b3 third bending part 122 second band part 122a tip 123 back mounting portion 124 Yoshijo (connector) 124a through frame (insertion portion) 124A1 Tanwaku portion 124a2 side frame portions 124a3 mounting shaft 124b projecting rod (holding fixing means) 125 free rings (through holding means)

Claims (13)

[Claims] A first band portion and a second band portion;
A band having a connector having an insertion portion through which the tip of the first band portion is inserted and holding and fixing means for holding and fixing a state in which the first band portion is inserted through the insertion portion, is attached to the second band portion. A band structure, wherein a step portion is provided in the middle of the first band portion inserted through the insertion portion. 2. The band structure according to claim 1, wherein the step portion is formed so as to protrude toward an outer surface of the first band portion as viewed in a tip direction of the first band portion. 3. The band structure according to claim 1, wherein the step portion is formed by refracting the first band portion. 4. The band structure according to claim 3, wherein a thickness of the step portion is formed to be thinner than a portion of the first band portion other than the step portion. 5. The band structure according to claim 1, wherein the first band portion is made of an elastic body. 6. The band structure according to claim 1, wherein the first band portion is made of a synthetic resin. 7. The band structure according to claim 1, wherein a protrusion is provided near a top portion of the step portion. 8. The band structure according to claim 7, wherein the protrusion protrudes from a top portion of the step portion toward a base end side of the band portion. 9. The band structure according to claim 1, wherein a groove is provided at a base end side of the band portion of the step portion. 10. The band structure according to claim 9, wherein the groove extends in a band width direction, and both ends in the band width direction are open. 11. The second band portion is provided with insertion holding means for inserting and holding the first band portion on a base end side of the band portion with respect to a mounting portion of the coupling tool. The band structure according to any one of claims 1 to 10, wherein: 12. The method according to claim 1, wherein
A portable watch having the band structure according to the above item. 13. any of claims 1 to 11 1
A portable electronic device having the band structure described in the paragraph.