JP2012178301A - Vehicle lamp and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the following problem of a vehicle lamp with a housing and an outer cover fixed by laser welding: welding strength is reduced when the housing and the outer cover are pressed from the outside for laser welding.SOLUTION: The vehicle lamp including the outer cover 20 and the housing 10 jointed by laser welding, and the method of manufacturing the same, are provided. The vehicle lamp includes a welding base part (13) protruding on a circumferential edge part (12) of the housing. On the outer cover (20), there is a welding leg part (25) having a concave groove (26) opposed to the above, and a laser beam is irradiated on the concave groove (26) from a side direction for welding with the concave groove (26) receiving the welding base part (13).

Description

  The present invention relates to a vehicular lamp and a laser welding method for the vehicular lamp. In particular, the present invention relates to a technique for reliably joining an outer cover and a housing in a method of manufacturing a vehicular lamp in which a transparent cover and a housing are welded using a laser.

  In the vehicular lamp, an outer cover (outer lens) is attached to a housing having an opening in the irradiation direction so as to cover the front opening. In general mounting structure, seal legs protrude from the peripheral edge of the outer cover, a U-shaped seal groove is formed in the housing to receive the seal leg, and the seal leg of the outer cover is bonded to the seal groove of the housing. It is supposed to be fixed via an agent.

  The above-described mounting method using the seal groove is generally adopted. However, in this mounting method, the seal leg and the seal groove must be formed, and when the outer cover is viewed from the front. There is a problem in that the adhesive is visually recognized through the seal leg and the appearance is impaired.

  Therefore, as a method for joining the outer cover and the housing, a manufacturing method is known in which both are welded and joined using laser light. For example, Patent Document 1 discloses a technique for performing welding with a housing on an inner surface of a seal leg.

JP 2004-066333 A

  If the housing and the outer cover are welded over the entire periphery of the outer cover and the entire circumference of the outer cover, the front opening of the housing can be integrated in a watertight manner.

  In order to integrate laser welding in a watertight manner, there is a problem that if the laser is not irradiated with the housing and the outer cover overlapped and the welding surface is pressurized, welding is insufficient and reliable bonding is difficult to obtain. .

  FIG. 10 is a partial cross-sectional view for explaining the laser welding portion of Patent Document 1. In FIG. The outer cover of the automotive lamp is made of a resin member and is made of a resin member that is transparent to the wavelength of the laser beam, and seal legs 120 are integrally formed on the entire periphery. The side surface of the seal leg is inclined. A joint 131 is provided on the entire peripheral edge of the opening of the housing via a flange 130, and the seal leg 120 is fitted to the joint 131 from the outside. As shown in FIG. 10, the outer cover and the housing are fitted together so as to be in close contact with each other, and in a state of being in close contact with each other, the laser irradiation nozzle 160 is irradiated with laser light and welded.

  However, since recent vehicle lamps have become irregularly shaped and have become larger in size, it has become difficult to assemble with the housing. In particular, it is not easy to perform laser welding by pressing the outer cover so that it is in surface contact with the housing all around the outer cover in a state where the outer cover and the housing are attached so that distortion does not occur. There are problems such as scratching and distortion. In addition, if the pressure at the time of laser welding is insufficient, there is a problem that the weld surface becomes dirty and impairs the merchantability, and the welding strength decreases.

  Therefore, the present invention has been made in view of the above problems, and the object of the present invention is to make it possible to attach the housing and the outer cover with a simple configuration, and to weld strength of the laser welding between the housing and the outer cover. An object of the present invention is to provide a vehicular lamp with improved performance.

In order to achieve the above object, the present invention provides:
A vehicle lamp (1) in which a translucent resin cover (20) and a light absorptive resin housing (10) are joined by laser welding,
The resin housing (10) includes a front opening that opens in the irradiation direction of the lamp (1), and a welding base (13) that protrudes from a peripheral edge (12) of the front opening,
The resin cover (20) is provided with welding leg portions (25) on the cover peripheral edge portion (22) which have concave inner walls facing each other and are capable of receiving the welding base portion.
The welding leg (25) is sandwiched between a first welding leg (23), a second welding leg (24), and a first welding leg and a second welding leg extending in a direction parallel to the welding base (13). Provided with a recessed groove (26), the first welding leg (23) is located on the outer peripheral side of the lamp,
A laser weld portion (40) is provided over the entire circumference in a state where the outer peripheral side surface (13a) of the weld base portion (13) and the first weld leg inner wall (23a) are in surface contact;
The inner side surface (13b) of the weld base (13) and the second weld leg inner wall (24a) are in contact with each other,
The laser welding part (40) provides a vehicular lamp characterized in that a welding surface (41) is positioned in a direction parallel to the assembly direction of the housing (10) and the resin cover (20). .

  According to the above invention, the welding strength between the housing and the resin cover can be improved without performing laser welding in a state where pressure is positively applied from the outside.

Furthermore, the present invention provides
Laser welding of the resin cover (20) and the resin housing (10) of the vehicular lamp (1) in which the translucent resin cover (20) and the light-absorbing resin housing (10) are joined by laser welding. A laser welding method for joining by:
A welding base (13) projecting in a predetermined direction parallel to the front-rear direction of the lamp is integrally formed on the peripheral edge (12) of the front opening that opens in the irradiation direction of the lamp (1) of the resin housing (20). Preparing a molded housing (10);
Preparing a resin cover (20) having a welding leg (23) having a concave inner wall facing the welding base (13) and receiving the welding base (13) on a cover peripheral part (22);
The side surface (13a) of the welding base (13) on the outer peripheral side of the lamp and the outer peripheral side inner wall (23a) of the welding leg (25) are in surface contact, and the side surface (13b) of the welding base on the inner peripheral side of the lamp Fitting the housing and the resin cover so that the inner peripheral side wall (24a) of the welding leg abuts;
A welding step of performing laser welding over the entire circumference in a state where the side surface (13a) of the welding base portion (13) on the outer peripheral side of the lamp and the outer peripheral side inner wall (23a) of the welding leg are in surface contact with each other. A laser welding method for a vehicular lamp is provided.

  According to the above invention, the welding strength between the housing and the resin cover can be improved without performing the step of performing laser welding in a state where pressure is positively applied from the outside.

  According to the present invention, the housing and the outer cover can be attached with a simple structure, and the welding strength of laser welding between the housing and the outer cover can be improved.

FIG. 1 is a front view showing a vehicular lamp according to a first embodiment. FIG. 2 is a side view showing the vehicular lamp. FIG. 3 is a cross-sectional view taken along the line AA of the vehicular lamp of FIG. FIG. 4 is a schematic cross-sectional view illustrating the portion B of FIG. 3 in an enlarged manner. FIG. 5 is a schematic cross-sectional view showing a state before assembly of FIG. FIG. 6 is a schematic perspective view showing a test piece used in a joint strength confirmation experiment. FIG. FIG. 8 is a side view illustrating a main part of a test apparatus whose welding strength has been confirmed by a tensile test. FIG. 9 is a schematic cross-sectional view showing a broken state after the tensile test. (A) shows material destruction and (B) shows the state of interface peeling. FIG. 10 is a partial cross-sectional view for explaining a conventional laser welding portion.

  Hereinafter, a vehicular lamp that is an embodiment of the present invention will be described with reference to FIGS.

  1 to 3 schematically show a vehicular lamp according to the present invention. FIG. 1 is a front view showing a vehicular lamp according to a first embodiment, FIG. 2 is a side view, and FIG. 3 is a cross-sectional view taken along line AA of FIG.

  In the vehicular lamp 1, a housing 10 having a recess 11 that opens forward and an outer cover 20 that covers the opening are joined to form a lamp space 30. For example, the vehicular lamp 1 is a headlamp and houses a lamp having a plurality of functions. FIG. 1 shows an example of a headlamp. A lamp room 30 includes a lamp chamber 31 that forms a traveling lamp and a passing lamp, a lamp chamber 32 that forms a position lamp, and a lamp chamber 33 that forms a turn lamp. Yes. Each of the lamp chambers 31, 32, 33 is provided with a light source 2 and a reflecting mirror 3, and the light source 2 is located on the back side of the housing 10. An extension 4 is provided at a position near the outer cover 20 between the respective lamp chambers 31, 32, 33. In addition, the code | symbol 34 is an inner lens and is arrange | positioned in the irradiation direction front of the lamp chamber 32 and the lamp chamber 33, respectively. Reference numeral 35 denotes a shade provided in front of the light source 2 in the lamp chamber 31.

  When the above-described vehicle lamp 1 is attached to the front of the vehicle, the vehicle lamp 1 emits light toward the traveling direction of the vehicle. The irradiation direction of light at this time is assumed to be the z direction indicated by an arrow in FIG. Therefore, the front of the irradiation direction refers to the main irradiation direction of the lamp, that is, the z direction, and in the case of a headlamp, the vehicle traveling direction. In the case of a vehicle lamp such as a stop lamp attached to the rear part of the vehicle, light is emitted toward the rear of the vehicle, so the direction opposite to the vehicle traveling direction is the Z direction, and the front of the lamp is the vehicle traveling direction. The reverse direction shall be said. The following description describes an example of a headlamp.

As the light source 2, various light sources such as an incandescent light bulb, a halogen light bulb, a discharge lamp, and a light emitting diode (LED) can be used. The light source 2 is inserted into the reflecting mirror from the rear side of the reflecting mirror 2 and fixed to the center of the rear portion of the reflecting mirror 3. The light source 2 may be inserted from the side of the reflecting mirror 3.
The reflecting mirror 3 includes a reflecting surface on the light source 2 side that forms a predetermined light distribution pattern by irradiating light from the light source 2. The reflecting mirror 3 is attached and fixed in the recess 11 of the housing 10. In the case of a lamp having a function other than the headlamp, it can be formed integrally with the housing 10 instead of the reflecting mirror 3.

  A welding base 13 is formed on the peripheral edge 12 of the front opening of the housing 10 over the entire circumference. The welding base 13 protrudes from the housing peripheral portion 12 in front of the lamp irradiation direction, that is, in the Z direction in FIG. 1, and is a plate-like member having a trapezoidal or rectangular cross section. It is integrally formed. The welding base 13 is selected from a resin material that absorbs light having a wavelength of a laser beam used in a laser welding process described later. A light absorbing material is also included in which a laser absorber, for example, carbon black is kneaded into the welding base 13. More preferably, a resin material excellent in bondability with the outer cover 20 and excellent in light transmittance is preferable. As a suitable material, an ASA resin (Acrylonitrile-Styrene-Acrylate) is used. In addition, ABS resin, acrylonitrile / ethylene propylene / styrene resin (AES), acrylic / acrylonitrile / styrene resin (AAS), acrylonitrile / styrene resin (AS), PC resin, PC / ABS resin and PC / polybutylene terephthalate ( A polymer alloy made of (PBT) resin can be used. The housing 10 includes components other than those described above, for example, those containing auxiliary components such as fillers made of inorganic or organic materials such as glass, silica, and talc, and anti-glare stabilizers.

  The outer cover 20 is made of a translucent resin material having a three-dimensional design shape. A weld leg 25 is formed integrally with the outer cover peripheral edge 22. Among the translucent resin materials, a thermoplastic resin material having low absorbability with respect to laser light used for laser welding described later is preferable, and is formed of an acrylic resin or a polycarbonate resin. A welding leg portion 25 protruding rearward is formed on the peripheral edge portion 22 of the outer cover 20 over the entire circumference. A lens cut 27 is partially provided on the outer cover 20.

  The welding leg 25 protrudes from the outer cover peripheral edge 22 toward the rear of the lamp in the irradiation direction, that is, in the direction opposite to the z direction in FIG. The welding leg portion 25 includes a pair of welding legs 23 and 24 and a concave groove 26 therebetween. The outermost peripheral side of the vehicular lamp 1 is the first welding leg 23 and the inner side thereof is the second welding leg 24. The first welding leg 23 and the second welding leg 24 are both plate-like members having a trapezoidal or rectangular cross section. The concave groove 26 has a size and depth that can receive the above-described welding base 13.

  By the way, in recent years, the vehicular lamp 1 has a more three-dimensional atypical shape in accordance with the design of the vehicle. For example, the outer cover 20 of the vehicular lamp 1 of FIG. 1 slants in the vehicle vertical direction and also in the vehicle horizontal direction (see FIGS. 2 and 3). A vehicular lamp having a shape that extends to the side of the vehicle body is also known. If the housing 10 and the outer cover 20 having a large slant are to be assembled, the outer cover 20 may be distorted during the assembly unless the outer cover 20 can be assembled from the same direction. Therefore, in order to improve the assembly of the housing 10 and the outer cover 20 and to prevent the outer cover 20 from being distorted, the mold opening directions of the molds during the injection molding of the housing 10 and the outer cover 20 are the same. The mold opening direction and the assembly direction are preferably matched.

  In the present embodiment, the assembling direction is a direction parallel to the z direction in order to improve the assembling property of the housing 10 and the outer cover 20. Here, in the present application, the term “parallel” does not indicate complete parallelism but includes parallel parts including those slightly inclined so as not to affect the assembling property. In order to improve the assembling property, the welding base 13 and the welding legs 23 and 24 are also extended in a direction parallel to the assembling direction z ', that is, a direction parallel to the z direction. In the present embodiment, an example in which the z direction, which is the main irradiation direction of the lamp, and the assembly direction z ′ are parallel will be described. However, the assembly direction z ′ may be a direction inclined with respect to the z direction. . By extending the welding base portion 13 and the welding legs 23 and 24 in a direction parallel to the assembly direction z ′, the moldability of the housing 10 and the outer cover 20 is also improved.

  FIG. 4 is a schematic cross-sectional view for explaining an enlarged joining state of the housing 10 and the outer cover 20 in a portion B of FIG. FIG. 5 is a schematic cross-sectional view showing a state before the housing 10 and the outer cover 20 of FIG. 4 are assembled. The welding base 13 is fitted into the concave groove 26, and the outer peripheral side surface 13a of the welding base 13 and the first welding leg inner wall 23a are joined by laser welding. The laser welding part 40 is located in a direction parallel to the assembly direction z ′. Even if the laser welding part 40 is looked into from the front direction (downward on the paper surface in FIG. 4) of the vehicular lamp 1, the laser welding surface 41 is parallel to the viewing direction, so that the laser welding surface 41 is hardly observed. Therefore, even if a non-uniform welded portion is generated on the laser welded surface 41, the appearance is not impaired.

  Next, a method for joining the outer cover 20 to the housing 10 by laser welding will be described.

  The outer cover 20 is assembled so as to cover the concave portion 11 from the direction parallel to the welding base portion 13 formed on the entire peripheral edge portion 12 of the housing 10, that is, the z ′ direction. At this time, the welding base 13 is fitted so as to be inserted into the concave groove 26. The outer peripheral side surface 13a of the welding base 13 and the first welding leg inner wall 23a are formed in parallel with each other, the inner side surface 13b of the welding base 13 and the second welding leg inner wall 24a are in parallel with each other, and the groove 26 It is formed in the same size as. Further, the welding base 13 has a trapezoidal cross-sectional shape with a narrower width on the tip side. Therefore, when the welding base 13 and the welding leg 25 are fitted together, the welding base 13 is fixed in surface contact within the groove 26. It is preferable to mold the housing 10 and the outer cover 20 so that they are always in surface contact over the entire circumference. However, if this is difficult due to errors in injection molding and manufacturing of the mold, laser welding of the concave groove 26 is performed. It is preferable that the side to be the portion 40 is in surface contact. Moreover, it is preferable that the welding base 13 has a shape having a side surface slightly inclined with respect to the assembly direction z ′. This is because the surface contact at the laser welded portion can be strengthened by utilizing its own weight by inclining. Furthermore, it is preferable that both the side surfaces 13a and 13b of the welding base portion 13 and the inner walls 23a and 24a of the concave groove 26 are smooth surfaces. This is because the smooth surface allows the laser welding surface to be cleanly joined.

  Next, laser welding is performed with the housing 10 and the outer cover 20 fitted. Laser welding uses a fiber laser having a wavelength of 1060 to 1070 nm and a spot diameter of 3 mm. In FIG. 4, the laser light L is emitted from the left side of the page, that is, from the outer peripheral side of the vehicular lamp 1. The laser beam L passes through the first welding leg 23 and travels toward the welding base 13. The welding base 13 that has received the laser beam L generates heat, and the first welding leg 23 also generates heat due to heat conduction. Both become molten and fuse and weld. When the laser beam L is not irradiated, the laser beam L is cooled, and the laser welding part 40 is bonded and fixed at the laser welding surface 41.

  In addition, the operation | work which presses from the outside using a special jig | tool when irradiating the laser beam L is not implemented. In the conventional laser welding, it was necessary to pressurize the bonding surface using a jig made of a transparent resin, but in this embodiment, the welding base 13 is sandwiched between the welding legs 23 and 24. This is because, due to the weight of the housing 10 or the outer cover 20, the laser welded portion 40 has a surface in contact with the surface without using a special jig. Therefore, the design surface of the outer cover 20, that is, the central portion is not damaged or soiled.

  In this embodiment, the welding base portion 13 made of a light-absorbing resin that generates heat is sandwiched between the welding leg portions 25. When the laser beam L is irradiated while the welding base 13 is sandwiched, heat is generated in the welding base 13, and the welding base 13 is thermally expanded by the heat generation. At this time, the weld base 25 expands thermally. Since the thermal expansion occurs in the sandwiched state, the bonding surfaces are pressurized with the pressure generated by the thermal expansion. Therefore, it is possible to press the bonding surfaces without performing forced external pressurization such as a jig for pressurization, and it is possible to increase the bonding strength of the laser welded portion. It is preferable to use a material having a larger linear expansion coefficient than that of the welding legs 23 and 24 as the welding base portion 13 because the linear expansion coefficient of the welding base portion 13 to be sandwiched is larger.

  Subsequently, an experiment for confirming the bonding strength by laser welding will be described.

  FIG. 6 to FIG. 9 illustrate a bonding strength confirmation experiment using a test piece. FIG. 6 is a schematic perspective view showing a test piece used in the experiment. Reference numeral 50 denotes a light absorbing resin TP, which corresponds to the housing 10 described above. Reference numeral 60 denotes a light-transmitting resin TP, which corresponds to the outer cover 20 described above.

As shown in FIG. 6, the light-absorbing resin TP50 is composed of a flat surface 51 (thickness: 3.0 mm) and a plate-like welded base 53 protruding in the normal direction of the flat surface 51, and is composed of an ASA resin (acrylonitrile styrene). (Acrylate resin) as a material, and formed integrally by injection molding. The welding base 53 is a wall-shaped member having a trapezoidal cross section with a tip thickness of 3.0 mm, a flat surface thickness of 3.1 mm, and a protruding length of 10 mm. The linear expansion coefficient is 8.2 × 10 ⁻⁵ / ° C. in both the resin flow direction and the right-angle direction as measured based on ISO11359-2.

As shown in FIG. 6, the light-transmitting resin TP60 includes a flat surface 61 (thickness: 3.0 mm) and two plate-like welding legs 63 and 64 projecting in the normal direction of the flat surface 61. It is integrally formed by injection molding using a resin (acrylic resin) as a material. A concave groove 66 is formed between the welding legs 63 and 64, and the concave groove 66 has a shape corresponding to the size of the welding base 53. The first welding wall 63 and the second welding leg 64 have a trapezoidal cross section with a tip thickness of 1.5 mm, a flat surface thickness of 1.6 mm, and a protruding length of 10 mm. The linear expansion coefficient is 6.0 × 10 ⁻⁵ / ° C. in both the resin flow direction and the right-angle direction as measured based on ISO11359-2.

The welding base 53 of the light-absorbing resin TP50 is fitted into the concave groove 66 of the light-transmitting resin TP60 so as to receive the laser light L from the laser head 71 located on the side as shown in FIG. 63 and the side surfaces of the welding base 53 are irradiated. The laser beam L had a wavelength of 1060 to 1070 nm, a spot diameter of 3 mm, and a heat quantity of ² J / mm2. The laser beam L passes through the first welding leg 63 and heats the side surface of the welding base 53. As a result, the bonding surface irradiated with the laser beam L is heated and melted, and the resins are bonded to each other. Reference numeral 72 denotes a laser welding portion which is a melted and joined portion. When performing laser welding, no jig is used to pressurize the joint surface between the two, and no pressure is applied from the outside.

FIG. 8 illustrates a schematic configuration of a test apparatus whose welding strength has been confirmed by a tensile test. Each of the test pieces 50 and 60 subjected to laser welding was set on holding jigs 75 and 75 of a tensile tester, and a tensile test was performed. As a tensile tester, AG5000C manufactured by Shimadzu Corporation was used, and the tensile speed was set to 10 mm / min.
The tensile strength was 170.3 Kg / cm ² and the fracture state was material fracture.

  Next, a light transmitting resin TP60 in which a gap between the welding base 53 serving as the laser welding portion 72 and the first welding leg 63 was widened was created, and a tensile test was performed. The same tensile test was performed with the gap d shown in FIG. 7 widened to 0.15 mm. Specifically, a test piece having a shape in which the second welding leg 64 is translated with respect to the first welding leg 63 in accordance with the gap d is created, and the inclination angles of the side surfaces of the welding base 53 and the welding legs 63 and 64 are the same. It was. In the test piece of FIG. 7, the gap d is 0 (zero) mm, but the dimensions are exaggerated so that there is a finite gap for easy understanding of the position of the gap. .

The test results of the test pieces S2 to S4 in which the above-described test piece is S1 and the gap d is changed are as follows.
d [mm] Judgment Destruction state Tensile strength [Kg / cm ² ]
----------------
S1 0 ○ Material destruction 170.3
S2 0.05 ○ Material destruction 158.3
S3 0.10 × Interface peeling 17.5
S4 0.15 x interface peeling 13.1

  FIG. 9 is a schematic cross-sectional view showing the fracture state after the tensile test. FIG. 9A shows material destruction, and FIG. 9B shows the state of interface peeling. As the criteria for judgment, the state destroyed by interfacial debonding was regarded as rejected (x), and the material destroyed state was regarded as acceptable (◯). From this experimental result, it was confirmed that even when there was a gap of 0.05 mm, the bonding surface was pressurized by thermal expansion and sufficient bonding strength was obtained.

    As a result, according to the vehicular lamp according to the present invention, the housing 10 and the outer cover 20 are brought into close contact with each other without positive external pressurization, and laser welding is reliably performed. Even if a gap is generated between the first welding leg 23 and the welding base 13 serving as a laser welding portion, the bonding surface is brought into close contact only by suppressing the outer cover 20 from the assembling direction z ′. Therefore, it is not necessary to facilitate a special jig for bringing the joint surfaces into close contact with each other.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. For example, the embodiment has been described in the embodiment in which the outer cover and the housing are laser-welded, but the present invention can also be applied to a vehicular lamp that performs laser welding of the inner lens and the housing or laser welding of the inner lens and the reflecting mirror. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

  According to the present invention, the housing and the transparent resin cover can be attached with a simple configuration, and the present invention can be applied to a vehicular lamp that ensures laser welding between the housing and the transparent resin cover.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Light source 3 Reflection mirror 4 Extension 10 Housing 11 Recess 12 Housing peripheral part 13 Welding base part 13a Outer side surface 13b Inner side surface 20 Outer cover 22 Outer cover peripheral part 23 First welding leg 23a First welding leg inner wall 23b First 1 Welding Leg Outer Wall 24 Second Welding Leg 24a Second Welding Leg Inner Wall 24b Second Welding Leg Outer Wall 25 Welding Leg 26 Groove 27 Lens Cut 30 Light Room Space 31, 32, 33 Light Room 34 Inner Lens 35 Shade 40 Laser Welding Part 41 Laser welding surface 120 Seal leg part 130 Flange part 131 Joining part 160 Laser irradiation nozzle

Claims (3)

A vehicle lamp in which a light-transmitting resin cover and a light-absorbing resin housing are joined by laser welding,
The resin housing includes a front opening that is open in the irradiation direction of the lamp, and a weld base that is formed to project from a peripheral edge of the front opening.
The resin cover is provided with a welding leg portion having an inner wall facing the concave portion and capable of receiving the welding base portion at a cover peripheral portion,
The weld leg includes a first weld leg extending in a direction parallel to the weld base, a second weld leg, and a concave groove sandwiched between the first weld leg and the second weld leg, and the first weld leg. Is located on the outer periphery of the lamp,
A laser welding portion is provided over the entire circumference in a state where the outer peripheral side surface of the welding base and the inner wall of the first welding leg are in surface contact with each other,
The inner side surface of the welding base and the inner wall of the second welding leg are in contact with each other,
The vehicular lamp, wherein the laser welding portion has a welding surface located in a direction parallel to an assembly direction of the housing and the resin cover.   2. The vehicular lamp according to claim 1, wherein a side surface of the welding base and an inner wall of the welding leg are inclined with respect to each other. A laser welding method in which a resin cover and a resin housing of a vehicular lamp are joined by laser welding, wherein a light-transmitting resin cover and a light-absorbing resin housing are joined by laser welding,
Preparing a housing integrally molded with a welding base projecting in a predetermined direction parallel to the front-rear direction of the lamp at the periphery of the front opening that is opened in the irradiation direction of the lamp of the resin housing;
A step of preparing a resin cover provided with a weld leg having a concave inner wall facing the weld leg and capable of receiving the weld leg;
The housing so that the outer peripheral side surface of the welding base and the outer peripheral inner wall of the welding leg are in surface contact with each other, and the inner peripheral side surface of the welding base and the inner peripheral wall of the welding leg are in contact with each other. And a process of fitting the resin cover;
A laser welding method for a vehicular lamp, comprising: a welding step of performing laser welding over the entire circumference in a state in which the side surface of the welding base on the outer peripheral side of the lamp and the outer peripheral side inner wall of the welding leg are in surface contact.

Images