JPH06238473A - External parts for timepiece and their joining method - Google Patents

Abstract

PURPOSE:To uniformly weld the external parts for timepieces without biasing and deforming even if these parts are joined by welding using a laser beam. CONSTITUTION:A bezel 12 and case 13 to be joined are set on a jig and the approximately opposite two points of the joint of the lower part 12a and rear surface 13a of projecting part to be joined of these two parts are simultaneously irradiated with the laser beam to form temporally joint parts 14, 14 for tentative stopping. As a result, the two parts are temporally joined to the state free from biasing with each other and deforming and thereafter, the joint parts are irradiated with the laser beam again, by which the normal joint part 15 is formed over the entire circumference. The uniform weld which has excellent appearance quality and with which waterproofness is maintained is thus obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is based on laser processing.
The present invention relates to a timepiece exterior part in which two exterior parts are joined and fixed, and a joining method thereof.

[0002]

2. Description of the Related Art Conventionally, for example, a bezel (glass rim) for holding a glass on a dial of a wristwatch and a body for holding the bezel are joined by caulking, biting, adhering, brazing or the like. Has been.

The caulking method is, for example, as shown in FIG. 10, in which a protrusion 2a is formed at the lower end of a bezel 2 and the bezel 2 is pressed and fixed with an O-ring 5 interposed between the bezel 2 and the body 3. In that state, the projection 2a is crimped from the position shown by the phantom line in the figure to the position shown by the solid line,
The bezel 2 is fixed to the body 3 and joined.

Further, in the method by biting, as shown in FIG. 11, a slope 2b is formed on the bezel 2 and a slope 3a is formed on the body 3 correspondingly, and the bezel 2 is pressed from above the body 3. The inclined surface 2b is press-fitted to the position shown in the drawing, and the inclined surface 2b is engaged with the inclined surface 3a of the body 3 so that the inclined surface 2b does not come off and is joined.

However, in the case of such joining by caulking or biting, when the bezel or the body is made of a super hard material, it cannot be deformed to caulk or bite, so the bezel The material of the shell and the body is limited to deformable materials such as stainless steel, and the shape thereof is complicated.

Further, in the case of bonding, there is concern about reliability in terms of long-term bonding strength, and in the case of brazing, the bonding site must be heated to a temperature of several hundreds of degrees.
Due to the heat, there is a problem that the mirror-finished surface is fogged and the heat causes deformation.

Therefore, as a joining method for solving these problems, there is a method of joining two exterior parts for a timepiece by welding using a laser beam. That is, as shown in FIG. 12, the laser beam 1 from the laser oscillator is joined to the bezel 2 and the body 3 at the joint (the portion to be joined) 4
And the irradiation position is sequentially moved in the circumferential direction, and by melting them, the bezel 2 and the body 3 are joined and fixed by welding.

[0008]

However, by using the laser beam in this way, two exterior parts for a timepiece are
When welding one round along the circumferential direction as in the case of joining the bezel and the body as described above, the welding is started by irradiating the laser beam and the welding position is gradually moved in the circumferential direction. The bezel located inside of the two parts to be welded due to immediate cooling of the first welded part is displaced toward the position where the first welding was started on the body, causing heat to shift. Due to the deformation, the alignment of the joint between the bezel and the body could not be aligned.

Therefore, in the case of a type of watch in which a waterproof O-ring 5 is mounted between the bezel 2 and the case 3, such as a wristwatch which is required to be waterproof as shown in FIG. Even if the welded portion 6 is misaligned and the welded portion 6 is not airtight, the O-ring 5 causes the bezel 2 and the body 3 to come together.
There is no problem because the waterproof property between the two is maintained, but there is a problem in the case of a thin wristwatch that does not use an O-ring as shown in FIG.

That is, in the case of a thin wristwatch, it is not possible to attach a waterproof O-ring between the bezel 2 and the body 3 in order to reduce the thickness of the entire watch. Since the welded portion 6 between the bezel 2 and the body 3 must be kept airtight, even if the joining portion of the bezel 2 and the body 3 is to be joined by welding by laser beam irradiation, a piece of the bezel as described above is used. With the welding method in which deformation due to leaning or heat occurs, uniform welding cannot be performed until airtightness can be maintained, so the waterproofness of the joint cannot be ensured.

Further, even in the case of joining the timepiece exterior parts which do not require waterproofness, the joining of the two parts by the laser beam irradiation according to the conventional method is such that the parts are biased or deformed by heat. Due to this, high accuracy of the joint cannot be maintained, so that there is a problem that a gap is created between the body and the bezel, which deteriorates the appearance quality and the assembling accuracy.

The present invention has been made in view of the above problems, and even if two watch exterior parts are joined by welding using a laser beam, the two watch exterior parts are offset from each other. It is an object of the present invention to achieve accurate welding without causing any deformation or deformation, and for the joined portion to be in a uniform welded state in which good appearance quality can be maintained.

[0013]

In order to achieve the above object, the present invention provides a timepiece exterior component in which two exterior components are joined and fixed by laser processing. A temporary joining portion for temporary fixing formed by simultaneously irradiating a portion with a laser beam, and a main joining portion for joining and fixing the two exterior components formed by irradiating the portion to be joined with the laser beam. To have.

Further, the timepiece exterior component may have a main joining portion formed by simultaneously irradiating a laser beam to a plurality of substantially opposing portions of the joining portions of the two exterior components.

Further, in the method of joining two watch exterior parts by laser processing, the two watch exterior parts to be joined are set on the stage inside the protective wall of the laser processing apparatus, and above the stage. Laser beams are simultaneously irradiated from a plurality of laser irradiating ports provided in the above to a plurality of substantially opposite portions of the joining portion of the two watch exterior parts to form a temporary joining portion for temporary fixing, and then the joining portion is joined. Provided is a method of joining an exterior component for a watch, which comprises irradiating a laser beam on the above to form a main joint for joining and fixing two exterior components.

[0016]

In the exterior component for a timepiece constructed as described above, there are provisional joint portions for provisional fastening formed by simultaneously irradiating the laser beam to a plurality of substantially opposing portions of the joint portion of the two exterior components. A state in which the two exterior components are temporarily fixed to the correct position by the temporary joint portion because the main joint portion for joining and fixing the exterior components is formed in the portion where the two exterior components are joined. Since it is joined by the main joint part, the two watch exterior parts are joined accurately without deviation or deformation, and the joined part is in a uniform welded state, which is good. A good appearance quality can be obtained. Further, when the main joint portion is formed on the entire circumference, waterproof property is also obtained.

Further, even if a plurality of substantially facing portions of the portions to be joined of the two exterior parts are provided with main bonding portions formed by being simultaneously irradiated with the laser beam, the laser beams are simultaneously applied to the plurality of opposing portions. When irradiated and welded, there is no deviation between the two exterior parts to be joined, as compared to the case where a laser beam is applied to one place and welded, so that the welded parts are also in a uniform welded state. Therefore, good appearance quality can be obtained.

Furthermore, according to the above-described method of joining the exterior parts for a timepiece, the two exterior parts for a timepiece are joined together on the stage in the protective wall of the laser processing apparatus, which is safe and the joining can be performed. Since the parts are formed with temporary joining portions for temporary fixing at a plurality of substantially opposite positions to be joined at the same time, thereby forming the main joining portion after the two components are not offset or deformed from each other, Uniform welding that gives the appearance quality is possible.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be specifically described below with reference to the drawings. FIGS. 1 (a) and 1 (b) are views showing a state in which a bezel and a body, which are exterior parts for a timepiece according to the present invention, are joined by a cross section and two lower surfaces, and FIG. FIG. 3 is a perspective view showing the external appearance of a laser processing apparatus for joining and fixing by welding using a beam, and FIG. 3 is a front view showing the vicinity of a laser beam irradiation part of the laser processing apparatus.

A bezel 1 which is an exterior part for a watch shown in FIG.
The portions to be joined to the body 2 and the body 13 are joined and fixed by welding by laser processing. That is, this bezel 12
The body and the body 13 are set on a mounting table in a protective wall of a laser processing apparatus described later, and a lower portion which is a portion where the bezel 12 and the body 13 are joined from a plurality of laser irradiation ports provided above the mounting table. As shown in FIG. 1 (b), laser beams are simultaneously irradiated to two portions of the lower surface 13a of the protruding portion 12a and the corresponding lower surface 13a of the body 13 side which are opposed to each other, and the temporary joining portion 14 for temporary fixing, 14 is formed.

Then, the joining portion is further irradiated with a laser beam whose output is higher than that at the time of temporary fixing to form a main joining portion 15, whereby the bezel 12 and the body 13 are joined.
Are joined and fixed.

Therefore, the lower portion 12a of the bezel 12 is
At two substantially opposite positions on the circumference of the lower surface 13a of the protruding portion of the body 13 and temporary joining portions 14, 14 for temporary fastening formed by being simultaneously irradiated with the laser beam are formed. The entire circumference of the joint (portion to be joined) between the lower portion 12a of the bezel 12 including the temporary joining portions 14, 14 and the lower surface 13a of the protruding portion 13a of the case body 13 (two or more places spaced apart in the circumferential direction) may be used. ), The main joint portion 15 is uniformly formed.

Glass 17 is attached to the upper step of the bezel 12 via a ring member 16 formed of a material having appropriate elasticity and elasticity such as fluororesin,
Between the bezel 12 and the body 13, a stepped portion 13b formed on the inner peripheral side of the upper surface of the body 13 is provided with an O-ring 18 for waterproofing to waterproof the bezel 12 and the body 13. I am trying.

When performing the temporary joining and the main joining by the laser beam irradiation, the O-ring 18 is pushed by pressing the bezel 12 toward the body 13 (in the direction of the white arrow in FIG. 1A). Deform it to improve the waterproof effect.

Incidentally, the joining (welding) of the bezel 12 and the body 13 by the laser beam irradiation has a structure in which the laser processing apparatus described later irradiates the laser beam from the upper side to the lower side. Since the parts to be joined of the body 13 are set on a jig in a posture in which the top and bottom are reversed with respect to the direction shown in FIG. 1A, the bezel 12 is received by the setting jig. The O-ring 18 is deformed by pushing down the side of the body 13 located above it.

Next, a laser processing apparatus for performing the temporary joining and the main joining by using a laser beam will be described with reference to FIGS.
Will be described with reference to. As shown in the overall appearance in FIG. 2, the laser processing apparatus includes a device main body 31 having a laser beam irradiation device 35 in a protective wall 32 for joining two parts by welding by irradiating a laser beam. ,
A power source section 33 for supplying electric power to the apparatus main body 31, an operation section 34 provided with various operation buttons and a monitor and the like necessary for operating the laser processing apparatus, and a laser beam for joining parts The monitor television 36 is used for adjusting the focus of the optical section through which the beam is passed in order to irradiate the spot in the optimum condition.

As shown in FIG. 3, the laser beam irradiation device 35 comprises a temporary welding beam irradiation unit 41 and a main welding beam irradiation unit 51. The main welding beam irradiation unit 51 has a CCD camera 52 to be described later. Is the device body 31 (see FIG. 2)
Is connected to a monitor TV 36 provided outside.

The temporary welding beam irradiator 41 fixes the two laser beam irradiators 42 and 43 in a suspended state by a holding bracket 44, and holds the holding bracket 44 by a guide member (not shown) so as to be able to move up and down. A movable part 45a of an adjuster 45 fixed to a fixing member 37 provided upright in the protective wall 32 (see FIG. 2) is attached thereto.

Therefore, when the knob provided on the upper portion of the adjuster 45 is rotated, the knob 2
The laser beam irradiators 42 and 43 are holding brackets 4.
Go up and down with 4. Then, the detection end 46a of the dial gauge 46 fixed to the fixing member 37 is brought into contact with the horizontal upper surface 44a of the holding bracket 44 to adjust the adjuster 4
When the knob 5 is rotated to move the holding bracket 44 up and down, the display scale pointed by the pointer of the dial gauge 46 changes according to the amount of the up-and-down movement.

Each of the laser beam irradiators 42 and 43 has a lens for irradiating a laser beam at a predetermined position on its tip side, and has an outer diameter of, for example, about 40 mm.
7 and 48 are attached, and they are attached in a symmetrical mounting posture with respect to a vertical plane as shown in the front view in FIG. 4A, the inclination angle θ1 = θ2 = 20 ° (the inclination angle with respect to the Y axis). In addition, as shown in FIG. 4B, the inclination angle on the side surface side is symmetric with respect to the vertical plane, and the inclination angle θ3 = θ4 = 10.
They are attached to each other (angle of inclination with respect to the X axis) so that they do not interfere with each other.

Then, the focal lengths L1 and L2 of the optical parts 47 and 48 are both set to 80 mm, for example, as shown in FIG.
Two welding points Po facing each other as shown in
1 and P02 can be simultaneously welded with the same output, and the temporary joint portions 14 and 14 shown in FIG. 1B can be simultaneously formed.

As shown in the plan view of FIG. 5, the laser beam irradiators 42 and 43 can be moved and adjusted in the arrow A direction while keeping the welding points Po1 and Po2 at positions facing each other (on the center line CL). It is like this. Therefore, when the diameter D of the welding portion of the timepiece exterior part to be welded is large, the pitch between the welding points is increased by widening the distance between the laser beam irradiators 42 and 43 in the arrow A direction. Since it can be widened, the opposite welding points Po1 'and Po2' of the two parts to be joined can be simultaneously welded with the same output.

The laser beam irradiators 42 and 43 are, for example, Nd: YAG laser (pulse oscillation).
Laser beam diameter is 450 μ, the charging voltage is 220 V, and each laser beam irradiator 42
110 and 43 have a circuit configuration in which 110 V is applied to each, and temporary fixing spot welding is performed at a single repetition frequency.

On the other hand, the main welding beam irradiation section 51 is shown in FIG.
As shown in FIG. 3, one laser beam irradiator 53 is vertically hung and fixed to a holding bracket 54, and the holding bracket 54 is held by a guide member (not shown) so as to be able to move up and down and fixed to a fixing member 37 there. The movable part 55a of the adjusted adjuster 55 is attached. Therefore,
When the knob provided on the upper portion of the adjuster 55 is rotated, the laser beam irradiator 53 moves up and down together with the holding bracket 54 accordingly.

Then, the detection end 56a of the dial gauge 56 fixed to the fixing member 37 is brought into contact with the horizontal upper surface 54a of the holding bracket 54, and the knob of the adjuster 55 is rotated to move the holding bracket 54 up and down. At this time, the display scale pointed by the pointer of the dial gauge 56 is changed according to the amount of elevation.

The laser beam irradiator 53 is provided with an optical unit 57 having a built-in lens for irradiating the laser beam at a predetermined position on the tip side thereof. The laser beam irradiator 53 irradiates two members to be welded such as exterior parts for timepieces with a laser beam having a higher output than the above-described temporary welding to perform main welding.
For example, Nd: YAG laser (pulse oscillation) is irradiated, the laser beam diameter is 450 μ, and the focal length of the optical system is 8 μm.
0 mm, charging voltage of 170V applied 35-
Seam-welding the entire welded area at a repetition frequency of 45 P / S.

A CCD camera 52 is tilted and fixed to a holding bracket 54 for fixing and holding the laser beam irradiator 53, and the CCD camera 52 catches the irradiation position of helium neon irradiated from the laser beam irradiator 53. Is used to focus the welding point.

That is, from the side of the laser beam irradiator 53 on the main welding side, the laser beam is used as a welding point in addition to the above-described laser beam (not visible with the Nd: YAG laser) through the optical section 57. Focusing helium neon (visible in red) is irradiated so that the light can be reliably focused and irradiated.

Therefore, in the focusing stage before starting welding, the irradiation position of the helium neon irradiated through the optical section 57 is captured by the CCD camera 52, and the C
The position of the neon light 58 projected on the monitor TV 36 to which the CD camera 52 is connected on the monitor is adjusted by rotating the knob of the adjuster 55 while watching the monitor TV 36.
The vertical position of the CD camera 52 is adjusted (moved together), and the position of the neon light 58 is adjusted to the monitor TV 36.
Crossing point Cpo of the cross line drawn on the screen of
Adjust to move to.

By doing so, the optical portion 57 of the laser beam irradiator 53 can be accurately focused on the welding point (position to be welded). Then, at this time, the display scale on which the pointer of the dial gauge 56 is inserted is read, and the adjuster 45 on the side of the beam for irradiating the temporary welding beam 41 is adjusted so that the display scale is the same as that of the two scales. Optical unit 4 of irradiators 42 and 43
The focal points of 7 and 48 are adjusted to the welding points.

The dial gauges 46 and 56 are respectively located at the lens centers on the lower ends of the optical portion 57 of the laser beam irradiator 53 for main welding and the optical portions 47 and 48 of the laser beam irradiators 42 and 43 for temporary welding. When the positions are at the same height, the pointers are adjusted in advance with high precision so that the pointers have the same numerical display scale.

Therefore, as described above, the adjuster 45 is simply adjusted so that the scales set by the dial gauges 56 and 46 of the main welding beam irradiation section 51 and the temporary welding beam irradiation section 41 match. All the focal points of the optical part 57 of the laser beam irradiator 53 for welding and the optical parts 47 and 48 of the laser beam irradiators 42 and 43 for temporary welding can be accurately adjusted to the welding point.

Next, the NC control table 6 which is a mounting table provided with a setting jig for setting the exterior parts for the watch to be welded.
0 will be described with reference to FIGS. 6 and 7. The NC control table 60 corresponds to the protective wall 3 of the device main body 31 shown in FIG.
It is arranged in the position No. 2 so that it can be freely and accurately moved to all the positions designated by the XY coordinates in the horizontal direction within a predetermined range.

In the NC control table 60, as shown in FIG. 6, a table 62 is fixed on a base 61 in a horizontal state by struts 63 and 64, and a cylinder 65 is arranged on the right side in the figure on the base 61 with a piston rod. 66 is fixed so that it can move in the vertical direction.

Then, the center of the bottom side of the pressing member holding frame 67 assembled in a square shape is fixed to the piston rod 66 in a well-balanced manner, and the center of the upper side of the pressing member holding frame 67 is cross-shaped as shown in FIG. The central portion of the pressing member 68 formed in the above is attached.

The left and right vertically extending column frames of the holding member holding frame 67 are formed of columnar members, which are formed in the table 62 as shown in FIG.
It penetrates through 62b and projects to the upper surface side of the table 62. Therefore, when the cylinder 65 is operated and the piston rod 66 is contracted, the pressing member 68 attached to the pressing member holding frame 67 moves down.

The table 62 corresponding to the pressing member 68
A set jig 70 for setting the member to be welded is provided on the upper side.
Is mounted on the linear slide 69, which is shown in FIG.
The set jig 70 is fixed to a piston rod 72 of a slide cylinder 71 fixed on a table 62.

Therefore, the slide cylinder 71
When the piston rod 72 is extended by operating the set jig 70, a set jig 70 for attaching a welded member such as a watch exterior component
7 moves downward in FIG. 7 and its tip comes into contact with the stopper 75 fixed on the table 62. When it moves to the position shown by the phantom line in the figure, it completely retracts from the position where the pressing member 68 is located. To do.

Further, a limit switch 73 is mounted on the table 62, and the setting jig 70 is shown in FIG.
When the side surface 70a of the set jig 70 is in the set position indicated by the solid line, the side surface 70a presses the rotatable detection lever 73a of the limit switch 73 to detect it. The pressing member 68 is positioned on the mounting portion 70b for mounting the member.

As described above, the laser processing apparatus shown in FIG. 2 is configured, and the laser processing apparatus is used in FIG.
When the bezel 12 and the body 13 shown in FIG. 2 are joined and fixed by welding, first, in order to make it easy to set the bezel 12 and the body 13, the setting jig 70 is moved to a position shown by an imaginary line in FIG. Move the bezel 12 onto the mounting portion 70b.
After setting the welding side of the body 13 and the body 13 upward, the set jig 70 is moved to the position shown by the solid line in the figure, and in that state, the cylinder 65 shown in FIG. 6 is operated to contract the piston rod 66. The pressing member 68 is lowered, and thereby the bezel 12 and the body 13 are pressed against the mounting portion 70b.

If the member to be welded can be set on the setting jig 70 when the setting jig 70 can be left in the position shown by the solid line in FIG. It is possible to save the trouble of temporarily retreating from the position where the pressing member 68 is provided.

Then, the NC control table 60 is moved to set the bezel 12 and the body 13 to the setting jig 70.
Is moved to the position shown by the phantom line in FIG. Then, the focusing of the laser beam irradiator 53 of the main welding beam irradiator 51 is performed by turning the knob of the adjuster 55 while watching the monitor television 36.

When the focusing is completed, read the display scale with the pointer of the dial gauge 56 at that time,
The adjuster 45 on the side of the temporary welding beam irradiation unit 41 is adjusted so that the dial gauge 46 is on the display scale similar to that scale, and the respective focal points of the optical units 47 and 48 of the two laser beam irradiation units 42 and 43 are adjusted. Accurately match each welding point.

When the focusing is completed, the NC control table 60 is moved again to move the bezel 12 and the body 13 to the welding point of the temporary welding beam irradiation section 41, and the laser beam irradiation by the laser beam irradiation units 42 and 43 is performed. The irradiation position is made to coincide with the temporary bonding portions 14 and 14 shown in FIG. 1B, and the laser beams with the above-mentioned predetermined outputs are simultaneously irradiated in a single shot, so that the temporary bonding portions 14 and 14 face each other. To form at the same time.

In this way, since the laser beam irradiation for the temporary joining is performed from the two laser beam irradiators 42 and 43 at the same time on the opposite positions of the member to be welded, the laser beam is irradiated to one position. The bezel 12 to be joined to the body 13 is the same as when welding is performed once while moving the irradiation position.
There is no deviation or deformation.

Next, the cylinder 65 shown in FIG. 6 is operated to raise the pressing member 68, and the slide cylinder 71 shown in FIG. 7 is operated to place the bezel 12 and the body 1 on the mounting portion 70b.
The setting jig 70 in the state where 3 is set is moved to the position shown by a virtual line in the figure.

Thereafter, the NC control table 60 is moved again to move the bezel 12 and the body 13 to the main welding beam irradiation section 51.
Lower part 1 of the bezel 12 shown in FIG. 1 (b), which is the joint between the bezel 12 and the body 13 of the bezel 12
The laser beam irradiator 5 for the main welding is applied to the entire circumference including the temporary joints 14 and 14 where the temporary joining is performed at the joint between the 2a and the lower surface 13a of the protruding portion of the body 13.
3, irradiation is performed while rotating the NC control table 60 at a moving speed of, for example, 400 to 600 mm / mim, and the main joining portion 15 is uniformly formed until it is slightly wrapped in the circumferential direction.

As described above, since the main welding is performed in a state in which the bezel 12 is not offset from the body 13 by the temporary welding, the joint portion is in a uniform welded state. When the main welding of the joint between the bezel 12 and the body 13 is not performed on the entire circumference as in the non-waterproof type but only a plurality of numbers (for example, two places) spaced in the circumferential direction are performed, the main welding is performed. At this time, even if the NC jig 60 is moved while the NC control table 60 is moved at the position where the holding member 68 shown by the solid line in FIG.
You can do it.

Further, the setting jig 7 shown in phantom in FIG.
A focus adjustment jig having the same shape as that of the setting jig 70 is previously attached to the table 62 with the same height as the setting jig 70 with high precision at the position of 0, and the focus performed before welding is started. If the member to be welded is placed on the focus adjustment jig, the number of times the NC control table 60 is moved can be reduced.

Further, in the above embodiment, the laser beam irradiator 53 on the main welding side and the laser beam irradiators 42, 43 on the temporary welding side are manually adjustable adjusters 55 and 45 whose heights are adjusted by turning the knobs. The laser beam irradiator 53 and the laser beam irradiators 42 and 43 on the temporary welding side can be moved up and down by an elevating mechanism using a pulse motor, and the laser beam irradiator 53 and the temporary welding side laser beam irradiator 42 and 43 can be moved up and down by the protective wall 32 (see FIG. 2). The height may be adjusted by an external operation from the outside.

The laser beam irradiator 42 on the temporary welding side is also provided.
As described above with reference to FIG. 4, the parts and 43 are slightly inclined to avoid mutual interference. However, if the opposite positions of the members to be welded can be simultaneously welded with substantially the same output,
One of them may be arranged vertically.

FIG. 8 is a sectional view showing an embodiment of a timepiece exterior component in which a core is welded to a back cover by using a laser beam. In this embodiment, the back cover 81 attached to the bottom of the body 83 holding the glass 87 is provided with an annular core 86 having a flange portion 86a formed inward at one end thereof.
In the same manner as in the above-described embodiment using the laser processing apparatus described in 1 above, the laser beam is simultaneously radiated to the two substantially opposite positions to form the temporary joining portions 84, 84 and temporary welding is performed.
The entire circumference of the lower end peripheral edge 86b including the temporary joining portions 84, 84 is irradiated with the laser beam again to form the main joining portion 85 (at the same position as the temporary joining portion 84 in FIG. 8, but on the entire circumference). It is fixed by.

That is, at two opposing positions of the lower end peripheral edge 86b, which is a portion to be joined to the back lid 81 of the core 86, FIG.
The laser beam irradiators 42 and 43 described above are used to simultaneously irradiate a laser beam for temporary fixing to form the temporary joining portion 84, and then the laser beam irradiator 53 (FIG. ) Is used to form the main joint portion 85.

In this way, the core 86 fixed to the back cover 81
Even if it is, since two parts (the lower end peripheral portion 86b) facing each other are temporarily welded to a predetermined position by temporary welding before the main welding (main bonding) is performed, a laser beam is irradiated to one part to irradiate the part. It is possible to prevent deviation and deformation of the back lid 81 that are likely to occur due to sudden cooling of the core 86 after being heated, as in the case of one-round welding while moving the position.

Therefore, since the core 86 can be fixed to the back cover 81 at an accurate position, no deviation occurs when the back cover 81 is mounted on the body 83. Further, in the case of this core 86, the projection 86c is formed on the outer periphery, and the back cover 81
When the is mounted on the body 83, it engages with an annular groove (which may be a recess formed at intervals in the circumferential direction) formed on the inner surface of the body 83. Further, a step portion is formed on the lower surface of the body 83, and by mounting the back cover 81 on the body 83 with the O-ring 89 fitted therein, the waterproof property between them is maintained.

The core 86 may be welded to the inner brim edge 86d in addition to the lower edge 86b. Further, the main welding of the lower edge rim 86b or the brim edge 86d is not limited to the entire circumference, and may be partially performed at intervals in the circumferential direction.

FIG. 9 is a cross-sectional view showing an embodiment in which two parts constituting the register ring are welded by using a laser beam. In this register ring 90, an annular base member 91 having a claw portion 91a on the entire inner circumference on the lower side is covered with an annular decorative member 92 on the upper surface of which a letter for displaying the time is drawn.
The inner end portion of the lower surface 92a of the decorative member 92 and the outer edge portion 91b of the lower surface of the base 91 (the portion to be joined) are opposed to each other at two positions on the circumference by using a laser beam as in the above-described embodiments. After forming and welding the temporary joint portion 94, the main joint portion 95 (at the same position as the temporary joint portion 94 in FIG. 9, but there are a plurality of portions having a predetermined width and spaced in the circumferential direction) is formed. There is.

As described above, the timepiece exterior component according to the present invention can be applied to the case where the register ring is composed of two components. In addition, in each of the above-described embodiments, the case where the temporary joining portions are formed at the two facing parts on the circumference of the joining portions of the two exterior components for a timepiece, and then the main joining portion is formed is described. Even if the laser beam for forming the main bonding portion is simultaneously irradiated to the two facing portions (which may be more than that) of the bonding portion without performing the temporary bonding, they are substantially facing each other at the same time. If the laser beam is applied to multiple points and welded, the parts to be welded will not be offset or deformed as compared with the case where the laser beam is applied to one point and the welding position is gradually moved. Similarly, the welded parts have a uniform joint and excellent appearance quality.

[0069]

As described above, according to the timepiece exterior component of the present invention, the two exterior components are accurately joined to each other by the main joint portion without being offset or deformed from each other. As a result, the welded parts are in a uniform welded state, so that good appearance quality can be obtained.
When the main joint portion is formed over the entire circumference, waterproofness is also obtained.

Further, even if a plurality of substantially facing portions of the portions to be joined of the two exterior parts have main joining portions formed by irradiating the laser beam at the same time, welding is performed by irradiating the laser beam at one portion. Since the exterior component to be joined does not deviate or deform with respect to the other component as in the case of being welded, similarly, the joined portion is in a uniformly welded state and good appearance quality is obtained.

Further, according to the method of joining the exterior parts for a timepiece according to the present invention, the two exterior parts for a timepiece are joined together on the stage in the protective wall of the laser processing apparatus, which is safe and can be welded. Since the two parts are simultaneously formed with temporary joining parts for temporary fixing at a plurality of substantially opposite positions of the part to be joined, thereby forming the main joining part after the two parts are not offset or deformed from each other, Welding with uniform joints and excellent appearance quality is possible.

[Brief description of drawings]

FIG. 1 is a view showing a state in which a bezel, which is an exterior component for a timepiece according to the present invention, and a body are joined by a cross section and two lower surfaces.

FIG. 2 is a perspective view showing an external appearance of a laser processing apparatus for joining and fixing two exterior parts for a watch by welding using a laser beam.

FIG. 3 is a front view showing the vicinity of a laser beam irradiation unit of the laser processing apparatus.

FIG. 4 is a laser beam irradiator 42 and a laser beam irradiator 42 of a temporary welding beam irradiator 41 also provided in the laser processing apparatus.
It is a figure which shows 3 by two surfaces, a front surface and a left side surface.

FIG. 5 is a plan view showing the laser beam irradiators 42 and 43 of the same.

FIG. 6 is a front view showing an NC control table 60 arranged in a protective wall 32 of the laser processing apparatus of FIG.

FIG. 7 is a plan view of the NC control table 60 of the same.

FIG. 8 is a cross-sectional view showing an embodiment of a timepiece exterior component in which a core is welded to a back cover by using a laser beam.

FIG. 9 is a cross-sectional view showing an embodiment in which two parts constituting the register ring are welded together by using a laser beam.

FIG. 10 is a cross-sectional view showing an example of a conventional exterior component for a timepiece in which a bezel is joined and fixed to a case by caulking.

FIG. 11 is a cross-sectional view showing an example of a conventional exterior component for a timepiece in which a bezel is joined and fixed to a case by biting.

FIG. 12 is a cross-sectional view showing an example of a timepiece exterior component for joining and fixing a bezel and a body using a conventional laser beam.

FIG. 13 is a cross-sectional view showing an example of a timepiece exterior component using a conventional O-ring.

FIG. 14 is a cross-sectional view showing an example of a conventional thin timepiece exterior component that does not use an O-ring.

[Explanation of symbols]

12 Bezel 12a Lower part 13 Body 13a Projecting part lower surface 14,84,94 Temporary joining part 15,85,95
Main joining part 32 Protective wall 41 Beam welding part for temporary welding 51 Beam irradiation part for main welding 52 CCD camera 60 NC control table 70 Set jig

Claims (3)

[Claims] 1. A timepiece exterior component in which two exterior components are joined and fixed by laser processing. Temporary fastening formed by simultaneously irradiating a laser beam to a plurality of substantially opposing portions of a portion where the two exterior components are joined. Temporary joint for
An exterior part for a timepiece, comprising: a main joining part for joining and fixing the two exterior parts formed by irradiating a laser beam to the part to be joined. 2. A timepiece exterior component in which two exterior components are joined and fixed by laser processing, and a main bond is formed by simultaneously irradiating a laser beam to a plurality of substantially opposite portions of a portion where the two exterior components are joined. An exterior part for a watch characterized by having a portion. 3. A method for joining two watch exterior parts by laser processing, wherein the two watch exterior parts to be joined are set on a stage in a protective wall of a laser processing device, and the upper part of the preceding stage is installed. From the multiple laser irradiation ports provided in
A laser beam is simultaneously irradiated to a plurality of substantially opposite portions of a joint portion of one timepiece exterior component to form a temporary joint portion for temporary fixing, and then the joint portion is irradiated with a laser beam to form the two outer casings. A method for joining exterior parts for a watch, characterized in that a main joining portion for joining and fixing the parts is formed.