JP6389995B2 - Method for welding seal leg in lamp and lamp - Google Patents

Description

The present invention melts a portion to be joined between a lamp housing of a vehicle lamp such as a marker lamp and a fog lamp or a general illumination lamp and a front cover covering the opening by frictional heat generated using ultrasonic vibration. The present invention relates to a welding method in which welding is performed, and a lamp in which a lamp housing and a front cover are integrated by the same method.

  Conventionally, the so-called vibration welding method in which the joint portion to be joined to the thermoplastic synthetic resin front cover as well as the thermoplastic synthetic resin lamp housing is joined by vibration welding, and the lamp housing and the front cover are integrated by the same method. A vehicular lamp is known.

  For example, in the following patent document, the seal leg of the front cover is brought into contact with the joint surface of the flange portion of the lamp housing, and both are in contact with each other in the lateral direction (X or Y direction orthogonal to the joint surface). ), The contact portion is melted by frictional heat, and the seal leg of the front cover is welded to the joining surface of the lamp housing, and the lamp housing for the vehicle in which the lamp housing and the front cover are integrated by the same method. Is described.

  Furthermore, by providing a seal ridge whose apex is offset toward the lamp chamber at the tip of the seal leg, the pressure applied to the seal ridge increases, and the frictional heat generated at the contact portion increases, resulting in a molten lamp. The joint surface on the housing side is scraped out more as a burr to the outside of the lamp chamber. As a result, it is also described that welding burrs on the inside of the lamp chamber, which cause a reduction in luminous efficiency of the lamp, are reduced.

JP 10-334705 A

  However, in the above-mentioned patent document, the vibration transmitted to the contact surface between the flange portion of the lamp housing and the seal leg (seal crest) of the front cover is a lateral vibration, and thus has the following problems. .

  First, the welding margin is enlarged in the vibration direction of the contact portion, and the width of the welding burr formed along the weld portion is large. In particular, the welding burr formed on the outside of the lamp chamber is larger than that on the lamp chamber side, and the appearance of the lamp is poor.

  Furthermore, since the width of the welding burr is different between the vibration direction of the contact portion (for example, the X direction) and the direction orthogonal to the vibration direction (for example, the Y direction), the appearance of the lamp is even worse.

  Secondly, at the beginning of the welding process (at the beginning of vibration transmission), the temperature of the seal crest on the front cover side and the contact portion of the joining surface of the lamp housing is low, so that the dust burrs generated by rubbing the two are lit. If it is scattered indoors and outside and remains in the lamp chamber of the lamp, the light distribution will be adversely affected. For this reason, the process of removing the powder burr | flash in a lamp chamber is needed after completion | finish of a welding process.

The present invention has been made in view of the above problems, and when welding the lamp housing and the front cover, the width of the welding burr formed along the welded portion is narrow and uniform, and at the beginning of the welding process. It is an object of the present invention to provide a method for welding a sealing leg of a lamp that can prevent dust burrs from being scattered to the inside of the lamp chamber, and a lamp integrated by welding using the same method.

In order to achieve the above object, the present invention (Claim 1) provides a tip end of a seal leg formed on any one of a lamp body and a front cover, which is a synthetic resin lamp component constituting a lamp chamber. In the welding method of the sealing leg of the lamp that vibrates and welds the part to the joint surface facing the other member,
A seal crest whose apex is offset to the inside of the lamp chamber is provided at the tip of the seal leg formed on the one member,
The one member is disposed so that the seal leg faces upward, and the other member is disposed so as to contact the seal crest above the one,
The contact portions of both the members are welded by longitudinal vibration.

  (Operation) The seal crest of the seal leg of one lamp component member (for example, the front cover) and the contact portion of the joint surface facing the other lamp component member (for example, the lamp housing) are vibrated and pressurized in the vertical direction. Then, frictional heat is generated at the corresponding contact portion, and the corresponding contact portion melts, so that the tip end portion of the seal leg is welded to the facing joint surface of the other lamp component member, but the contact portion expands the welding allowance. Because it vibrates only in the vertical direction without vibrating in the lateral direction (direction along the joint surface), the welding burrs that accumulate on the inside and outside of the lamp compartment in the welded portion are narrow in width and in the welded portion. Each has a certain width.

  In addition, because the contact part melts with frictional heat, welding burrs accumulate on the lamp chamber side and outside of the contact part, but the apex of the seal crest constituting the contact part is offset to the lamp chamber side, That is, since the contact portion is offset toward the lamp chamber side with respect to the center of the seal leg in the thickness direction, as shown in FIGS. 4 (a), (b), and (c), the lamp chamber tip side of the seal leg tip is located. The contact part melts at the side, and a large amount of weld burr accumulates inside the contact part outside the lamp chamber. Specifically, the amount of weld burrs that accumulates in the welded part is roughly equivalent to the volume of the seal crest and is constant along the welded part, but it accumulates on the outside of the lamp compartment as much as it accumulates in the lamp compartment. The amount is reduced.

  For this reason, after the welding process is completed, the seal crest provided on one lamp component member and the contact portion of the opposite joint surface of the other lamp component member are fused and integrated, that is, one lamp component member 4 (d), the welding burrs accumulate on the inside and outside of the lamp chamber as shown in FIG. 4 (d). However, the amount of welding burrs accumulated outside the lamp chamber and accumulated outside the lamp chamber is less than the amount of welding burrs accumulated on the inside of the lamp chamber and is not so noticeable.

  On the other hand, the amount of welding burrs accumulated on the inside of the lamp chamber is larger than the amount of welding burrs accumulated on the outside of the lamp chamber, but is hidden by the front cover and is not noticeable.

  In addition, there is a difference in the mechanism of occurrence of welding burrs between the inside and outside of the lamp chamber of the contact portion, and powder burrs generated at the contact portion at the beginning of the welding process (vibration transmission) are scattered only outside the lamp chamber, It does not scatter inside.

  Specifically, as shown in FIG. 4 (a), the abutting portion is vertically in a state where there is no gap, that is, in a state where the seal crest is in reliable contact with the joining surface of the lamp housing, as shown in FIG. Since the vibration pressure is applied in the direction, the conversion efficiency of the vibration energy into the frictional heat in the contact portion is high, and the time until the contact portion becomes high temperature and melts is short. On the other hand, as shown in FIG. 4 (a), the abutting portion is in a state where there is a gap, that is, the seal crest is in a state where there is a gap with the joining surface of the lamp housing (the seal crest is not present). Because it is vibrated and pressurized in the vertical direction in a state in which it is close to the joint surface of the lamp housing but cannot be reliably contacted, the conversion efficiency of vibration energy into frictional heat at the contact portion is low, and the contact portion is immediately It takes time to melt without becoming high temperature.

  For this reason, the contact portion immediately becomes a high temperature (melting temperature) near the lamp chamber side of the contact portion, and immediately starts welding as shown in FIG. 4B from the beginning of the welding process (vibration transmission). While burr accumulates, the abutting part does not immediately reach a high temperature (melting temperature) near the outside of the lamp chamber of the abutting part. As shown in FIG. 4 (c), weld burrs accumulate at the stage where the temperature of the part becomes high (melting temperature).

  And the seal crest which comprises a contact part faces up, and the powder burr | flash which generate | occur | produced in the lamp room outer side of a contact part at the beginning of this welding process (vibration transmission) is as shown in FIG.4 (b). Then, it falls along the inclined surface of the seal mountain and scatters outside the lamp chamber.

  In other words, the welding burrs immediately accumulate from the beginning of vibration transmission at the abutting portion near the lamp chamber side, and the welding burrs accumulated near the lamp chamber side at the abutting portion are accumulated at the beginning of the welding process (vibration transmission). It acts as a barrier that suppresses scattering (intrusion) of dust burrs that occur near the outside of the lamp room at the contact portion.

  Moreover, since the powder burrs generated and scattered near the outside of the lamp chamber of the contact portion are not taken into the weld burrs accumulated in the contact portion thereafter, The amount is further reduced.

A second aspect of the present invention relates to the vibration welding method for the seal leg of the vehicular lamp according to the first aspect,
The one lamp component member is accommodated and fixed in a receiving jig so that the seal leg faces upward, and the other lamp component member is positioned laterally with respect to the one lamp component member above the one lamp component member. At the same time, it is arranged so as to be in urging contact with the seal crest via a horn that is a vibration transmitting member, and configured to allow ultrasonic vibration to act on the contact portion via the horn.

  (Operation) In a method in which a horn is disposed below the abutting portion between the lamp component members arranged so as to face each other vertically, and ultrasonic vibration is applied to the upper abutting portion via the horn, for example, a lamp component member If the gap is formed between the upper lamp component and the receiving jig due to the dimensional error, and the adhesion is insufficient, the upper lamp component will be affected when ultrasonic vibration acts on the contact portion. May vibrate with respect to the receiving jig, and the conversion efficiency of the vibration energy into the frictional heat at the contact portion may be reduced accordingly.

  However, according to the second aspect of the present invention, since the heavy horn is arranged at the upper side, the lamp component forming the seal leg is pressed from above and is securely held in close contact with the receiving jig. When the sonic vibration acts, the vibration of the lamp component member with respect to the receiving jig is reliably suppressed.

  That is, the contact portion is vibrated and pressurized in the vertical direction in a state in which the contact between the seal crest (the apex thereof) and the joint surface of the other lamp component member is always secured, so that the frictional heat of the vibration energy at the contact portion is increased. The conversion efficiency is high, the time until the contact portion becomes hot and melts is further shortened, and dust burrs generated near the outside of the lamp chamber of the contact portion are also reduced.

  In addition, since the front cover that touches the human eye is not desired to be damaged as much as possible, it is desirable that the lamp housing be vibrated and welded as a vibration transmitting side that contacts the horn.

  According to a third aspect of the present invention, there is provided a lamp in which the lamp housing and the front cover are welded and integrated by the method according to the first or second aspect, wherein the tip end of the seal leg formed on the one lamp component member and the other A welding burr that bulges to the inside and outside of the lamp chamber is formed at the welding portion with the lamp component member, and the amount of swelling of the welding burr to the outside of the lamp chamber is smaller than the amount of swelling to the lamp chamber side. It comprised so that it might become.

According to the present invention (Claim 1), the seal crest of the seal leg of one lamp component member and the abutting portion of the facing joint surface of the other lamp component member are ultrasonically pressurized and generated in the vertical direction. Since the corresponding contact portion is melted by the frictional heat, the tip end portion of the seal leg is welded to the facing joint surface of the other lamp component member. Since the width is narrow and the width is constant along the welded portion, it is possible to provide a lamp having a good appearance.

  In addition, since the apex of the seal crest constituting the contact portion is offset to the inside of the lamp chamber, the amount of bulging of the welding burr outside the lamp chamber of the welding portion is smaller than the amount of bulging of the welding burr on the lamp chamber side. Since the welding burr is inconspicuous, it is possible to provide a more attractive lamp.

Also, the welding burr that accumulates near the lamp chamber side of the abutting part causes scattering (intrusion) of powder burrs that occur near the lamp chamber outside of the abutting part at the beginning of the welding process (vibration transmission). Thus, foreign matter (powder burrs) that may hinder proper light distribution does not remain in the lamp chamber, and the yield in manufacturing the lamp is significantly improved. That is, since the powder burr generated in the ultrasonic vibration welding process does not remain as a foreign substance in the lamp chamber, the powder burr removing process after the welding process can be simplified or omitted, and the lamp chamber is sealed by the welding process. This is particularly effective in the case of a lamp structure in which a light source cannot be retrofitted after the welding process.

  According to claim 2, since the conversion efficiency of the vibration energy into the frictional heat at the contact portion is high, the welding process time is shortened, and the amount of powder burr generated at the contact portion is reduced. Foreign matter (powder burrs) that may interfere with light distribution does not remain in the lamp chamber, and the yield in manufacturing the lamp is further improved.

  According to the third aspect of the present invention, the welding burrs bulging to the inside and outside of the lamp chamber have a narrow width and a constant width along the weld portion, so that the appearance of the lamp is improved.

  In particular, the amount of bulging of the welding burr on the outside of the lamp chamber is smaller than the amount of bulging of the welding burr on the inside of the lamp chamber, and the welding burr is not conspicuous so that the appearance of the lamp is further improved.

It is a front view of the marker lamp comprised by the welding method which concerns on this invention. It is a longitudinal cross-sectional view (cross-sectional view along line II-II shown in FIG. 1) of the marker lamp. It is a principle figure which shows the whole structure of the ultrasonic vibration welding apparatus for enforcing the welding method which concerns on this invention. It is a figure which shows the vibration welding process which welds the seal leg of a front cover to a lamp housing, (a) is an expanded sectional view of the contact part before the vibration welding process start, (b) is the contact part at the beginning of a vibration welding process. (C) is an expanded sectional view of the contact part in the middle of a vibration welding process, (d) is an enlarged sectional view of the contact part after completion | finish of a vibration welding process. It is a figure which shows the other Example of the ultrasonic vibration welding apparatus for enforcing the welding method which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described based on examples.

1 and 2 show a marker lamp which is a vehicular lamp constructed by applying one embodiment of the method of the present invention ( welding method), FIG. 1 is a front view of the marker lamp, and FIG. 2 is a diagram of the marker lamp. It is a longitudinal cross-sectional view.

  In these drawings, a marker lamp 10 includes a container-shaped lamp housing 12 whose front side is open, a front cover 15 integrated on the front side of the lamp housing 12, and a bulb that is a light source accommodated in the lamp housing 12. 18.

  Specifically, the peripheral portion of the front cover 15 is welded to the peripheral portion of the opening of the lamp housing 12, whereby the lamp chamber S of the marker lamp 10 is defined, and a valve insertion hole provided in the rear wall of the lamp housing 12. A bulb 18 is inserted into the housing 12a from the rear of the housing 12, and a filament 18a, which is a light source body, is disposed at a predetermined position in the lamp chamber S.

  More specifically, a flange portion 13 projecting sideways is provided around the opening peripheral portion of the lamp housing 12 made of thermoplastic synthetic resin, and the joint surface 14, which is the surface of the flange portion 13, is exposed to heat. The front end portion of the seal leg 16 provided around the back surface of the peripheral edge of the front cover 15 made of plastic synthetic resin is joined and integrated by ultrasonic vibration welding.

  Welding burrs 23 a and 23 b bulge and form inside and outside the lamp chamber S at the welding portion 22 between the tip end portion of the seal leg 16 of the front cover 15 and the joint surface 14 of the flange portion 13 of the lamp housing 12. However, the widths of the welding burrs 23a and 23b are narrow, and the widths of the welding burrs 23a and 23b are constant along the welding portion 22, respectively.

  In particular, the bulging amount of the welding burr 23b on the outside of the lamp chamber exposed to the outside of the lamp lamp 10 is smaller than the bulging amount of the welding burr 23a on the lamp chamber inner side, and the welding burr 23b is not so conspicuous. Looks even better.

  The bulging amount of the welding burr 23a on the lamp chamber side is larger than the bulging amount of the welding burr 23b on the outer side of the lamp chamber, but the welding burr 23a is hidden by the front cover 15, that is, inside the lamp chamber S from the outside. Cannot be visually recognized, so that the appearance of the marker lamp 10 is not affected.

FIG. 3 is a diagram showing the overall structure of an ultrasonic vibration welding apparatus for carrying out an embodiment method ( welding method) of the present invention. By this ultrasonic vibration welding apparatus 40, the lamp housing 12 of the marker lamp 10 and The front cover 15 is integrated by welding.

The ultrasonic vibration welding apparatus 40 uses ultrasonic vibration in a vertical direction (a direction orthogonal to the bonding surface 14) to oppose the front end portion of the seal leg 16 of the front cover 15 and the flange portion 13 of the lamp housing 12. Friction heat is generated at the contact portion of the joint surface 14, and the contact portion is melted by this friction heat, so that the tip end portion of the seal leg 16 of the front cover 15 is attached to the joint surface 14 of the flange portion 13 of the lamp housing 12. It is what is welded.

More specifically, the vibrator 44 converts the electrical energy sent by the oscillator 43 into ultrasonic vibration, and simultaneously amplifies it to an amplitude necessary for welding and transmits it to the horn 46 that is a vibration transmitting member. Thus, the ultrasonic vibration in the vertical direction is transmitted to the contact portion between the front end portion of the seal leg 16 of the front cover 15 and the joint surface 14 of the flange portion 13 of the lamp housing 12 that faces each other.

  Further, the front end of the seal leg 16 of the front cover 15 is provided with a seal crest 20 (see FIG. 4A) whose apex 20a is offset inside the lamp chamber S, and the front cover 15 is provided with the seal leg 16 Is received and held by the receiving jig 42 so as to face upward, and is positioned and fixed in the horizontal direction and the vertical direction.

On the other hand, above the front cover 15, the lamp housing 12 is positioned laterally with respect to the front cover 15 , and the joining surface 14 of the flange portion 13 is biased against the seal crest 20 on the front cover 15 side. The ultrasonic vibration in the vertical direction is applied to the contact portion between the seal crest 20 and the joint surface 14 of the flange portion 13 through a horn 46 that is arranged in contact with each other and that is a vibration transmitting member and opens downward in a cylindrical shape. Communicated.

The ultrasonic vibration welding apparatus 40 configured in this manner causes the seal crest 20 at the tip end of the seal leg 16 of the front cover 14 and the contact portion of the joint surface 14 of the flange portion 13 of the lamp housing 12 to face each other in the vertical direction. When the ultrasonic vibration is applied, frictional heat is generated at the contact portion, and as shown in FIG. 4, the contact portion is melted by frictional heat, and the front end portion of the seal leg 16 of the front cover 14 is connected to the lamp housing 12. The flange portion 13 is joined and integrated.

  In particular, the seal crest 20 provided at the tip of the seal leg 16 of the front cover 15 and the abutting portion of the joint surface 14 facing the lamp housing 12 have lateral vibration (vibration in the direction along the joint surface 14). ), But the longitudinal ultrasonic vibration (the ultrasonic vibration in the direction orthogonal to the bonding surface 14) is transmitted and the contact portion is melted by frictional heat. Therefore, the welded portion between the seal leg 16 and the lamp housing 12 The widths of the welding burrs 23 a and 23 b accumulated on the inside and outside of the lamp chamber 22 are narrow and have a constant width along the welding portion 22.

  Further, at the contact portion of the joint surface 14 facing the seal crest 20, frictional heat is generated by vibration pressurization in the vertical direction, and the contact portion is melted to be welded inside and outside the lamp chamber S. Although the burrs 23a and 23b are accumulated, the seal crest 20 has a shape in which the apex 20a is offset to the lamp chamber side, that is, the contact portion is on the lamp chamber inner side with respect to the center of the seal leg 16 in the thickness direction. Because of the offset, as shown in FIGS. 4A, 4B, and 4C, the contact portion melts near the lamp chamber side at the tip end portion of the seal leg 16 and is inside the lamp chamber outside the contact portion. A large amount of welding burr accumulates.

  Specifically, the amount of weld burrs that accumulates in the welded portion 22 substantially corresponds to the volume of the seal crest 20 and is constant along the welded portion 22, but the amount accumulated in the lamp compartment side is large, so The amount accumulated in

  For this reason, after the welding step is completed, the seal portion 20 provided on the front cover 15 and the contact portion of the joining surface 14 facing the lamp housing 12 are fused and integrated, that is, the seal formed on the front cover 15. In the form in which the tip end portion of the leg 16 is welded to the opposing joint surface 14 of the lamp housing 12, welding burrs 23a and 23b are accumulated on the inside and outside of the lamp chamber of the welding portion 22, as shown in FIG. However, the amount of the welding burr 23b accumulated outside the lamp chamber and exposed outside the lamp is smaller than the amount of the welding burr 23a accumulated inside the lamp chamber, and the welding burr 23b is not so conspicuous.

  On the other hand, the amount of the welding burr 23a accumulated on the lamp chamber side is larger than the amount of the welding burr 23b accumulated on the outside of the lamp chamber, but the welding burr 23a is not noticeable because it is hidden by the front cover 15.

In addition, there is a difference in the mechanism of occurrence of welding burrs on the inside and outside of the abutting portion, and powder burrs generated at the abutting portion at the beginning of the welding process ( ultrasonic vibration transmission) are scattered only outside the lamp chamber, It does not scatter to the inside of the lamp room.

  Specifically, as shown in FIG. 4A, the abutting portion is in a state where there is no gap, that is, the seal crest 20 is in contact with the joining surface 14 of the lamp housing 12 as shown in FIG. Since the pressure is vibrated in the vertical direction in the state, the conversion efficiency of the vibration energy into the frictional heat in the contact portion is high, and the time until the contact portion becomes high temperature and melts is short. On the other hand, as shown in FIG. 4A, the abutting portion is in a state where there is a gap, that is, the seal ridge 20 is in a state where there is a gap with the joint surface 14 of the lamp housing 12 (see FIG. 4A). Since the seal crest 20 is vibrated and pressurized in the vertical direction in a state where the seal crest 20 approaches the joint surface 14 of the lamp housing 12 but cannot be reliably contacted, the conversion efficiency of the vibration energy into the frictional heat at the contact portion is low. It takes time until the contact portion melts quickly without being heated.

  For this reason, the contact portion immediately becomes a high temperature (melting temperature) near the lamp chamber side of the contact portion, and immediately starts welding as shown in FIG. 4B from the beginning of the welding process (vibration transmission). While the burr 23a accumulates, the abutting portion does not immediately reach a high temperature (melting temperature) near the outside of the lamp chamber of the abutting portion. At the stage where the contact portion reaches a high temperature (melting temperature), the welding burr 23b accumulates as shown in FIG.

And the seal | sticker peak 20 which comprises an abutting part has faced upward, and the powder burr | flash 24 which generate | occur | produced in the lamp room outer side of the abutting part at the beginning of this welding process ( ultrasonic vibration transmission) is FIG. As shown in (), the light falls along the inclined surface 21 of the seal ridge 20 and scatters outside the lamp chamber.

That is, the welding burrs 23a immediately accumulate from the beginning of vibration transmission at the abutting portion near the lamp chamber side, and the welding burrs 23a accumulated near the abutting portion toward the lamp chamber side are welded steps ( ultrasonic vibration transmission). It acts as a barrier that suppresses scattering (intrusion) of the powder burr 24 generated near the outside of the lamp chamber at the initial contact portion.

  Thus, in the lamp chamber S of the marker lamp 10 in which the front cover 15 is welded and integrated with the front opening of the lamp housing 12, there is hardly any powder burr 24 generated at the contact portion at the start of the welding process. For this reason, the powder deburring process, which has been indispensable after the end of the conventional vibration welding process, can be simplified or omitted as necessary.

  In addition, according to the method of the present embodiment, the powder burr 24 generated near the outside of the lamp chamber of the contact portion and scattered outside the lamp is not taken into the welding burr 23b accumulated in the contact portion thereafter. The amount of the welding burr 23b accumulated outside the lamp chamber of the welding part 22 is further reduced corresponding to the scattered powder burr 24, and the bulging amount of the welding burr 23b exposed to the outside of the marker lamp 10 is further reduced. The burr 23b is less conspicuous and the appearance of the marker lamp 10 is further improved.

Further, in the above-described first embodiment method, the ultrasonic vibration welding apparatus 40 shown in FIG. 3 is used, and the front cover 15 is housed and fixed in the receiving jig 42 so that the seal legs 16 face upward. The lamp housing 12 is arranged so as to be in urging contact with the seal ridge 20 and the ultrasonic vibration in the vertical direction is applied to the contact portion via the horn 46. FIG. The ultrasonic vibration welding apparatus 40A shown in FIG. 1 is used, a seal crest 20 is provided at the tip of the seal leg 16 formed on the lamp housing 12A, and the tip of the seal leg 16 of the lamp housing 12A is connected to the opposing joining surface 14 of the front cover 15A. When the ultrasonic vibration welding is performed, the lamp housing 12A is housed and fixed in the receiving jig 42A so that the seal leg 16 faces upward, and the front cover 15A is biased against the seal crest 20 above it. To place such, may be configured to exert a ultrasonic vibration in the vertical direction to the contact portion through the horn 46A is a vibration transmitting member.

  Further, in the above-described first embodiment method, a lamp structure in which a bulb insertion hole 12a is provided in the rear wall of the lamp housing 12 and a bulb 18 as a light source can be retrofitted, that is, the seal leg 16 of the front cover 15 is attached. The lamp structure in which the powder burr 24 remaining in the lamp chamber S can be removed from the bulb insertion hole 12a by, for example, air blowing after the welding process of welding and integrating with the lamp housing 12 has been described. A light source such as an LED is integrated in advance, and then a seal leg 16 of the front cover 15 is welded and integrated to the lamp housing 12 so that the lamp chamber S is sealed, that is, the light source is retrofitted. This is particularly effective when applied to a lamp structure that cannot be used, because the defective product generation rate is greatly reduced.

  That is, in the first embodiment method described above, the seal crest 20 that is the abutting portion on the front lens 15 side of the lamp to which the light source can be retrofitted is formed in a shape in which the apex 20a is offset to the inside of the lamp chamber. The lamp chamber S in the case where the method of the first embodiment is applied to a lamp in which the light source cannot be retrofitted, although the abutting portion is arranged so as to be ultrasonic vibration welded. The defective product generation rate that becomes NG due to the presence of powder burrs in the seal ridge 20 is composed of an isosceles triangle with a cross section whose apex 20a is located at the center in the width direction (thickness direction of the seal leg). Compared to the case of the comparative example method in which the contact portion was ultrasonic vibration welded under the same conditions as in Example 1, the comparative example method had a defective product generation rate of 23% for all 90 workpieces. On the other hand, in the method of this embodiment, all 120 workpieces Defective product generation rate and was 2%.

  In addition, as a lamp integrated by the above-described embodiment method and the above-described method, a marker lamp which is a vehicle lamp has been described as an example. However, the lamp is not limited to a vehicle lamp, and is not limited to a general lighting lamp. Needless to say, the present invention can be similarly applied to the ultrasonic vibration welding method between the lamp housing and the front cover covering the opening, and the general lighting lamp fused and integrated by the same method.

DESCRIPTION OF SYMBOLS 10 Mark lamp S which is a vehicle lamp Lamp chamber 12, 12A Lamp housing 13 which is a lamp component 13 Flange part 14 Joining surface 15, 15A Front cover 16 which is a lamp component 16 Seal leg 20 Seal crest 20a The top 21 of a seal crest Inclination Surface 22 Welding portions 23a, 23b Welding burrs 40, 40A Ultrasonic vibration welding apparatus 42, 42A Base jig 43 Oscillator 44 Vibrator 46, 46A Horn that is a vibration transmitting member

Claims (3)

A seal in a lamp that welds the tip end portion of a seal leg formed on one of a lamp housing and a front cover, which is a component member made of synthetic resin that defines a lamp chamber, to the joint surface facing the other member In the method of welding the legs,
A seal crest whose acute angle apex is offset toward the inside of the lamp chamber is provided only at the central portion in the thickness direction of the end surface of the front end of the seal leg formed on the peripheral edge of the front cover so that the seal leg faces upward. Placing the front cover,
A flange portion constituting the joint surface is formed in a front opening of the lamp housing, and the lamp housing is disposed above the front cover so that the joint surface of the flange portion abuts on the apex of the seal crest. With
Through the flange portion, the ultrasonic vibration in the vertical direction is transmitted to the abutting portion between the flange portion and the seal ridge, and near the lamp chamber side of the abutting portion, a welding burr is accumulated immediately after the vibration transmission is started, The welding burr suppresses the scattering of the powder burr that occurs near the outside of the lamp chamber of the contact portion to the lamp chamber side, and the powder burr is scattered and dropped outside the lamp chamber along the slope of the seal mountain. By this, the contact part of the said flange part and the said seal crest is welded, The sealing leg welding method in the lamp characterized by the above-mentioned. The front cover is received and fixed in a jig, and the lamp housing is positioned above the front cover in a lateral direction with respect to the front cover, and the lamp housing is connected via a horn that is a vibration transmitting member that covers the lamp housing. 2. The ultrasonic vibration is applied to a contact portion between the flange portion and the seal crest via the horn, and the flange portion is held so as to be in urging contact with the seal crest. The welding method of the seal | sticker leg in the lamp | ramp of description.   3. A lamp in which the lamp housing and the front cover are welded and integrated by the method according to claim 1 or 2, wherein a front end portion of a seal leg and a front opening of the lamp housing are formed on a peripheral edge portion of the front cover. A weld burr that bulges toward the outside and inside of the lamp chamber is formed at the welded portion of the flange portion formed on the opposite side, and the amount of swelling of the weld burr to the outside of the lamp chamber is on the lamp chamber side. A lamp characterized by being smaller than the amount of bulge.

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