JP2019096554A - Vehicle lamp fitting - Google Patents

Abstract

To secure a stable bonding state with respect to a lamp housing of a cover.SOLUTION: In a vehicle lamp fitting having an interior space in which a lamp housing with a formed weld surface and a cover for covering the interior space are included and the cover is joined to the lamp housing by the laser deposition, the cover includes: an opposing surface located adjacent to a design surface part with an exterior surface facing the vehicle outside, wherein the opposing surface opposes other vehicles and is curved with respect to the design part; and a laser penetration part provided at least in the periphery of the cover where a laser beam, which is radiated during laser deposition, penetrates, in which when a virtual line extending in the depth direction at each position of the laser penetration part is to be the reference line, the laser beam is directed to the weld surface of the laser penetration part from an inclination angle in the range of 0 degree to 38 degrees with respect to the reference line.SELECTED DRAWING: Figure 7

Description

  The present invention relates to the technical field of a vehicle lamp whose cover is joined to the lamp housing by laser welding.

  In a vehicle lamp such as a tail lamp, for example, the vehicle lamp is integrally disposed so that both of the vehicle lamps are disposed one by one in a state where they are disposed adjacent to each other in a non-movable portion and a movable portion of the vehicle. There is a so-called seamless type vehicle lamp that is recognized in (see, for example, Patent Document 1). For example, one vehicle lamp is disposed in the main body of the vehicle which is the non-movable portion, the other vehicle lamp is disposed in the trunk lid which is the movable portion, and one vehicle lamp in a state where the trunk lid is closed. And the other vehicle lamp are positioned adjacent to each other.

  In such a seamless type vehicle lamp, in each of the one vehicle lamp and the other vehicle lamp, in addition to the design surface part whose outer surface is directed to the outside of the vehicle, the positions are opposed to each other in the adjacent state. A facing surface portion ("leg portion" in Patent Document 1) capable of transmitting light is provided. The facing surface portion is bent with respect to the design surface portion and protrudes from the outer peripheral portion of the design surface portion in a direction substantially orthogonal to the design surface portion.

  In the seamless type vehicle lamp, for example, when light is emitted from the light source of one of the vehicle lamps, the emitted light is transmitted through the design surface portion of the cover of one of the vehicle lamps and emitted to the outside The light is transmitted through the two opposing surface portions facing each other, is incident on the other vehicle lamp, is transmitted through the design surface portion of the cover of the other vehicle lamp, and is emitted to the outside.

  On the other hand, in the case of a vehicle lamp, the cover is joined to the lamp housing, but the joining operation of the cover to the lamp housing has recently been performed by laser welding for the purpose of securing a stable joining state and improving productivity. Is getting more.

  Therefore, also in the seamless type vehicle lamp as described above, it is desirable that a stable bonding state or the like of the cover to the lamp housing by laser welding be secured.

JP, 2014-123547, A

  In the seamless type vehicle lamp as described above, the cover is provided with the facing surface portion projecting from the design surface portion, and in the conventional vehicle lamp, when laser welding is performed to the lamp housing of the facing surface portion The laser beam incident from the end of the design surface portion is incident on the facing surface portion. Therefore, the laser beam is transmitted through the inside of the opposite surface in the direction of protrusion of the opposite surface from the design surface and reaches the welding surface of the lamp housing.

  As described above, since the laser beam is transmitted through the inside of the facing surface portion in the projecting direction, when the amount of protrusion of the facing surface portion from the design surface portion is large, a sufficient light amount of the laser beam does not reach the welding surface. As a result, it may not be possible to ensure a stable bonding of the cover to the lamp housing.

  Therefore, an object of the vehicle lamp of the present invention is to ensure a stable bonding state of the cover to the lamp housing.

  First, a vehicle lamp according to the present invention includes a lamp housing having an inner space and having a welding surface and a cover covering the inner space, wherein the cover is joined to the lamp housing by laser welding. The cover is provided with a design surface portion whose outer surface is directed outward of the vehicle and an opposite surface portion which is opposed to the other vehicle lamp positioned adjacent to the design surface portion and which is bent with respect to the design surface portion. At least an outer peripheral portion of the cover is provided as a laser transmitting portion through which laser light emitted during laser welding is transmitted, and when an imaginary line extending in a thickness direction at each position of the laser transmitting portion is a reference line, The laser transmitting portion is irradiated with the laser light toward the welding surface from an angle in the range of 0 degree to 38 degrees with respect to the reference line.

  Thereby, the laser light is irradiated to the laser transmitting portion of the cover from an angle in a range in which the inclination angle with respect to the thickness direction is small.

  Second, in the vehicle lamp according to the present invention described above, it is preferable that the laser transmitting portion be irradiated with the laser beam from an angle in the range of 0 to 25 degrees with respect to the reference line.

  As a result, the laser transmitting portion is irradiated with the laser light from an angle in a range where the inclination angle with respect to the reference line is smaller, and the irradiation efficiency of the laser light to the welding surface becomes higher.

  Third, in the vehicle lamp according to the present invention described above, it is preferable that the laser transmitting portion be irradiated with the laser light from an angle of 0 degrees with respect to the reference line.

  As a result, the laser transmitting portion is irradiated with the laser beam on the line of the reference line, and the irradiation efficiency of the laser beam to the welding surface is further enhanced.

  Fourth, in the vehicle lamp according to the present invention described above, the portion of the cover where the facing surface portion is bent with respect to the design surface portion is provided as a curved surface portion, and the inner surface of the design surface portion and the facing surface portion It is desirable that the angle formed with the inner surface be greater than 92 degrees.

  As a result, even when the radius of curvature of the inner surface of the curved surface portion is large, it becomes difficult to perform total reflection on the inner surface of the curved surface portion at the time of laser beam irradiation.

Fifth, in the vehicle lamp according to the present invention described above, the portion of the cover where the facing surface portion is bent with respect to the design surface portion is provided as a curved surface portion, and the following conditional expression (1) and conditional expression It is desirable to satisfy (2).
(1) R ≦ 0.0002e ^0.1105θ
(2) θ ≦ 92
However,
R: Curvature radius of the inner surface of the curved portion (unit: mm)
e: Napier number (base of natural logarithm)
θ: an angle (unit: degree) between the inner surface of the design surface portion and the inner surface of the opposite surface portion
I assume.

  Thereby, the internal reflection of the laser light on the inner surface of the curved surface portion is suppressed.

  According to the present invention, the laser light is irradiated to the laser transmitting portion of the cover from a range of small angles of inclination with respect to the thickness direction, so a sufficient amount of laser light reaches the welding surface and the cover is stable against the lamp housing It is possible to secure the joined state.

The embodiment of the vehicle lamp according to the present invention will be described with reference to FIGS. 2 to 10, and this figure is a rear view showing the vehicle lamp disposed in the vehicle. It is a top view which shows the state in which two vehicle lamps were located adjacently. 1 is a schematic exploded perspective view of a vehicular lamp. It is a schematic perspective view of a vehicle lamp. It is a top view of a cover. It is a top view which shows notionally the state by which a laser beam is irradiated on a reference line to a laser penetration part. It is a top view which shows notionally the state by which a laser transmission part is irradiated from the direction which inclines with respect to a reference line. It is sectional drawing which shows notionally the state by which a laser transmission part is irradiated from the direction which inclines with respect to a reference line. It is a figure which shows angle (theta) and curvature radius R. FIG. It is a graph which shows the measurement result about the joining state with respect to the lamp housing of a cover in the relationship of angle (theta) and curvature radius R.

  Hereinafter, a mode for carrying out a vehicle lamp of the present invention will be described with reference to the attached drawings.

  The embodiment shown below is an application of the vehicle lamp of the present invention to a combination lamp having a tail lamp function. The present invention relates to various vehicle lamps such as turn signal lamps, clearance lamps, stop lamps, daytime running lamps, cornering lamps, hazard lamps, position lamps, back lamps, fog lamps or combination lamps that are a combination of these. It can be widely applied.

  In the following description, the irradiation direction of the light from the light source to the outside shall be the rear to indicate the front, back, up, down, left, and right directions. However, the directions of front, rear, up, down, left, and right shown below are for convenience of explanation, and the implementation of the present invention is not limited to these directions.

  For example, the vehicle lamps 1 are attached to and disposed at both left and right ends of the vehicle 100 (see FIG. 1). The vehicular lamp 1 is disposed, for example, in a non-movable portion such as the main body portion 101 of the vehicle 100.

  The other vehicle lamps 1A and 1A are disposed at the left and right ends of the trunk lid 102, and the vehicle lamps 1A and 1A are adjacent to each other on the inside of the vehicle lamps 1 and 1 when the trunk lid 102 is closed. Be positioned. The vehicular lamp 1A includes at least a lamp housing 2A opened rearward and a cover 3A closing an internal space of the lamp housing 2A (see FIG. 2).

  The vehicular lamp 1 is provided, for example, as a combination lamp having the functions of a stop lamp and a turn signal lamp in addition to the function of a tail lamp, and the vehicular lamp 1A has a function of a backup lamp in addition to the function of a tail lamp, for example. It is provided as a combination lamp.

  Although the example in which the vehicular lamp 1 is disposed at the non-movable portion such as the main body portion 101 of the vehicle 100 and the vehicular lamp 1A is disposed at the movable portion such as the trunk lid 102 has been described above, The vehicular lamp 1 may be disposed in a movable portion such as the trunk lid 102, and the vehicular lamp 1A may be disposed in a non-movable portion such as the main body portion 101 of the vehicle 100.

  The vehicular lamp 1 includes a lamp housing 2 opened rearward and laterally (left or right) and a cover 3 closing the opening of the lamp housing 2 (see FIGS. 3 and 4). The rear opening of the lamp housing 2 is a first opening 2a, and the lateral opening of the lamp housing 2 is a second opening 2b. The lamp housing 2 and the cover 3 constitute a lamp case 4.

  In addition to a light source (not shown) for emitting light, for example, a light guide (not shown) for guiding light emitted from the light source in a predetermined direction is disposed inside the lamp case 4.

  The lamp housing 2 is formed of, for example, an opaque resin material such as ABS resin (acrylonitrile copolymer resin), and is projected rearward from the upper and lower end portions of the base surface portion 5 and the base surface portion 5, respectively. It has wall surface portions 6 and 6 and a side surface portion 7 which protrudes rearward from an outer end of the base surface portion 5 in the left-right direction.

  A welding surface 8 is formed on the lamp housing 2. The welding surface 8 is formed across the inner end surface in the left-right direction of the base surface portion 5, the side surfaces of the wall surface portions 6, 6, the rear surface of the wall surface portions 6, 6, and the rear surface of the side surface portion 7. In the welding surface 8, the inner end face in the left-right direction of the base surface portion 5 is formed as a first welding portion 8a, and the side surfaces of the wall surface portions 6, 6 are formed as second welding portions 8b, 8b. The rear surface 6 is formed as third welded portions 8c, 8c, and the rear surface of the side surface portion 7 is formed as a fourth welded portion 8d. Portions of the welding surface 8 where the second welding parts 8b and 8b and the third welding parts 8c and 8c are continuous are formed as curved parts 8e and 8e which are formed in the shape of outwardly convex curved surfaces.

  The cover 3 is formed of, for example, a transparent material such as acrylic, and has a design surface 9 whose outer surface faces the outside of the vehicle 100 and an opposing surface 10 bent with respect to the design surface 9. For example, the design surface portion 9 is formed in a rectangular shape whose outer surface faces the rear, and the thickness direction is the front-rear direction. The facing surface portion 10 is in a state in which the direction with respect to the design surface portion 9 is different, and the thickness direction is substantially in the left-right direction.

  A portion in which the design surface portion 9 and the facing surface portion 10 are continuous is provided as a curved surface portion 11 formed in the shape of an outwardly convex curved surface, and the radius of curvature of the inner surface 11 a of the curved surface portion 11 is the outer surface of the curved portion 8 e in the welding surface 8 Is the same as the radius of curvature of. The angle θ between the inner surface 9a of the design surface 9 and the inner surface 10a of the facing surface 10 is, for example, 92 degrees or less (see FIG. 5).

  The outer peripheral portion of the cover 3 is provided as a laser transmitting portion 12 through which laser light is irradiated and transmitted (see a portion outside the alternate long and short dash line shown in FIGS. 1 and 2). Therefore, the laser transmitting portion 12 is provided at a position extending between the design surface portion 9 and the facing surface portion 10. The laser transmitting portion 12 is provided over the front end portion of the facing surface portion 10, the upper and lower end portions of the facing surface portion 10, the upper and lower end portions of the design surface portion 9, and the outer end portion in the left-right direction of the design surface portion 9. The front end portion of the facing surface portion 10 of the laser transmitting portion 12 is provided as a first transmitting portion 12a, the upper and lower end portions of the facing surface portion 10 are provided as second transmitting portions 12b and 12b, the upper and lower end portions of the design surface portion 9 Are provided as the third transmission portions 12c, 12c, and the outer end in the left-right direction of the design surface portion 9 is provided as the fourth transmission portion 12d. The portion where the second transmission parts 12b and 12b of the laser transmission part 12 and the third transmission parts 12c and 12c are continuous is provided as bent parts 12e and 12e which are formed in a curved surface shape convex outward.

  In the vehicle lamp 1 configured as described above, the cover 3 is joined to the lamp housing 2 by laser welding. Bonding of the cover 3 to the lamp housing 2 by laser welding is performed by irradiating the laser transmitting portion 12 with the laser light B from the outer surface side from the irradiator 200 (see FIG. 6).

  The laser beam B irradiated to the laser transmitting portion 12 is transmitted through the laser transmitting portion 12 and reaches the welding surface 8 of the lamp housing 2. When the laser beam B reaches the welding surface 8, the contact portion between the laser transmitting portion 12 and the welding surface 8 is melted and the cover 3 is joined to the lamp housing 2.

  At this time, assuming that virtual lines extending in the thickness direction at each position of the laser transmission portion 12 are reference lines S, S,..., The laser light B is, for example, a laser transmission portion on the reference lines S, S,. It is irradiated to 12. Therefore, the laser beam B is directed to the welding surface 8 from the angle of 0 degree with respect to the reference lines S, S,... However, the laser beam B may be emitted from an angle in the range of 0 degree to 38 degrees with respect to the inclination angle P (see FIGS. 7 and 8) with respect to the reference line S. Further, it is more preferable that the laser beam B be irradiated from an angle in the range of 0 degree to 25 degrees with respect to the reference line S, but as described above, the angle of inclination angle P with respect to the reference line S is 0 degree It is even more desirable to be irradiated from

  The irradiation direction of the laser beam B is not limited to the direction inclining vertically and horizontally with respect to the reference line S, and may be any inclined direction such as the upper oblique direction or the left oblique direction with respect to the reference line S It is also good.

  In the bonding of the cover 3 to the lamp housing 2 by laser welding, for example, the laser beam B is continuously irradiated to each position of the laser transmitting portion 12 in a state where the irradiator 200 is moved along the laser transmitting portion 12 It is done by. When the laser light B is continuously irradiated to each position of the laser transmission part 12, for example, the laser light B is irradiated from the third transmission part 12c to the second transmission part 12b, but at this time the laser The light B is irradiated to the bending portion 12e provided in the curved surface portion 11, and the irradiated laser light B is transmitted through the bending portion 12e and travels to the bending portion 8e of the welding surface 8 (see FIG. 9).

  As described above, although the laser beam B is transmitted through the bending portion 12e and travels toward the bending portion 8e, since the inner surface 11a of the curved surface portion 11 is formed into a curved surface, the laser beam B may be a laser depending on the irradiation angle to the bending portion 12e. The light B may be internally reflected (totally reflected) by the inner surface 11a, and the laser light B may not easily reach the curved portion 8e.

However, in the vehicle lamp 1, the cover 3 is configured to satisfy the following conditional expression (1) and conditional expression (2), and the internal reflection of the laser beam B on the inner surface 11a is suppressed, and the laser A sufficient amount of light B reaches the curved portion 8e.
(1) R ≦ 0.0002e ^0.1105θ
(2) θ ≦ 92
However,
R: Radius of curvature of inner surface 11 a of curved surface portion 11 (unit: mm)
e: Napier number (base of natural logarithm)
θ: angle (unit: degree) between the inner surface 9 a of the design surface 9 and the inner surface 10 a of the facing surface 10
I assume.

  Below, the measurement result which becomes a basis of conditional expression (1) and conditional expression (2) is demonstrated (refer FIG. 10).

  The measurement is performed using the angle θ between the inner surface 9a of the design surface 9 and the inner surface 10a of the facing surface 10 and the radius of curvature R of the inner surface 11a of the curved surface 11 as a variable. It was carried out by "determining the bonding state" whether or not the part 8e was bonded in a good state. In the “judgment of bonding state”, when no gap due to contraction or the like called shrinkage due to temperature change of the cover 3 is generated between the bending portion 12e and the bending portion 8e, it is determined as “good”.

The measurement results are shown in FIG. In FIG. 10, the horizontal axis is the angle θ (degrees), and the vertical axis is the curvature radius R (mm). The data (plot) indicated by “□” in FIG. 10 is the value of the upper limit of the curvature radius R determined as “good” in the “judgment of bonding state” with respect to each value of the angle θ. The relationship between the angle θ and the radius of curvature R can be expressed by an approximation formula based on these data:
R = 0.0002e ^0.1105θ (R = 0.0002 × (e to the 0.1105θ power))
It became.

  Further, as shown in the measurement results of FIG. 9, when the angle θ is a large angle, the upper limit of the curvature radius R determined as “good” is rapidly increased.

Based on the above measurement results, in the range where the angle θ is 92 degrees or less,
R ≦ 0.0002e ^{0.1105 θ}
Good bonding conditions were obtained in the range satisfying the above. The range where this good bonding state was obtained is shown in FIG.

  Therefore, when the cover 3 satisfies the following conditional expression (1) and conditional expression (2), internal reflection at the inner surface 11a of the laser beam B is suppressed, and a sufficient light amount of the laser beam B is at the curved portion 8e. It was confirmed that the bent portion 12e of the cover 3 was joined to the curved portion 8e of the lamp housing 2 in a good condition.

  According to the above measurement results, in the range where the angle θ exceeds 92 degrees, internal reflection on the inner surface 11a of the laser light B is particularly hard to occur, and the curvature radius R is a large value such as exceeding 4 mm. It was confirmed that, even in the case of a failure, a good bonding state to the curved portion 8e of the bent portion 12e can be obtained.

  Therefore, the angle θ between the inner surface 9a of the design surface portion 9 and the inner surface 10a of the facing surface portion 10 is, for example, larger than 92 degrees as shown in the vehicle lamp 1A of FIG. Even when the curvature radius R of 11a is large, total reflection is difficult to be performed by the inner surface 11a of the curved surface portion 11 when the laser light B is applied, and a stable bonding state of the cover 3 to the lamp housing 2 can be secured.

  As described above, in the vehicle lamp 1, when the phantom line extending in the thickness direction at each position of the laser transmission portion 12 is the reference line S, the laser transmission portion 12 has an inclination angle with respect to the reference line S The laser beam B is emitted toward the welding surface 8 from an angle in the range of 0 degrees to 38 degrees.

  Therefore, since the laser beam B is irradiated to the laser transmitting portion 12 from an angle in a range where the inclination angle with respect to the thickness direction is small, a sufficient light amount of the laser beam B reaches the welding surface 8 and the cover 3 is stable with respect to the lamp housing 2 It is possible to secure the joined state.

  In particular, the laser transmitting portion 12 is irradiated with the laser beam B from an angle in the range of 0 to 25 degrees with respect to the reference line S, so that the laser transmitting portion 12 is in the range of a smaller angle with respect to the reference line S The laser light B is irradiated to 12 and the irradiation efficiency to the welding surface 8 of the laser light B is high, welding of the cover 3 to the lamp housing 2 is performed with high efficiency, and speeding up the bonding operation of the cover 3 to the lamp housing 2 In the above, it is possible to secure a stable bonding state of the cover 3 to the lamp housing 2.

  Further, the laser beam B is irradiated to the laser transmitting portion 12 at an inclination angle of 0 degrees with respect to the reference line S, whereby the laser beam B is irradiated to the laser transmitting portion 12 on the line of the reference line S The irradiation efficiency to the welding surface 8 of the cover 3 is higher, the welding to the lamp housing 2 of the cover 3 is performed with higher efficiency, and the speeding up of the bonding operation of the cover 3 to the lamp housing 2 is further accelerated. A stable bonding state to the lamp housing 2 can be secured.

  100: vehicle, 1A: vehicle lamp, 2A: lamp housing, 3A: cover, 1: vehicle lamp, 2: lamp housing, 3: cover, 8: welding surface, 9: design surface, 9a: inner surface, 10: 10 Opposite surface portion, 10a ... inner surface, 11 ... curved surface portion, 12 ... laser transmission portion

Claims (5)

A lamp for a vehicle, comprising: a lamp housing having an inner space and having a welding surface and a cover covering the inner space, the cover being joined to the lamp housing by laser welding.
The cover is provided with a design surface portion whose outer surface faces the outside of the vehicle and an opposite surface portion which is opposed to the other vehicle lamp positioned adjacent to the vehicle surface and is bent with respect to the design surface portion.
At least an outer peripheral portion of the cover is provided as a laser transmitting portion through which a laser beam irradiated at the time of laser welding is transmitted,
When an imaginary line extending in the thickness direction is used as a reference line at each position of the laser transmission portion,
A vehicle lamp according to claim 1, wherein the laser transmitting portion is irradiated with the laser light toward the welding surface from an angle in the range of 0 degrees to 38 degrees with respect to the reference line. The vehicular lamp according to claim 1, wherein the laser transmitting portion is irradiated with the laser light from an angle in the range of 0 degree to 25 degrees with respect to the reference line. The vehicular lamp according to claim 2, wherein the laser transmitting portion is irradiated with the laser light from an angle of 0 degree with respect to the reference line. The portion of the cover where the facing surface portion is bent relative to the design surface portion is provided as a curved surface portion,
The vehicle lamp according to claim 1, wherein an angle formed by the inner surface of the design surface portion and the inner surface of the facing surface portion is greater than 92 degrees. The portion of the cover where the facing surface portion is bent relative to the design surface portion is provided as a curved surface portion,
The vehicle lamp according to claim 1, wherein the following conditional expression (1) and conditional expression (2) are satisfied.
(1) R ≦ 0.0002e ^0.1105θ
(2) θ ≦ 92
However,
R: Curvature radius of the inner surface of the curved portion (unit: mm)
e: Napier number (base of natural logarithm)
θ: an angle (unit: degree) between the inner surface of the design surface portion and the inner surface of the opposite surface portion
I assume.

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