JP2011159489A - Vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable sufficiently securing design characteristics of a vehicular lighting fixture of which a translucent cover is joined to a front end opening part of a lamp body by vibration welding over the nearly entire circumference. <P>SOLUTION: By means that a welding objective face of the lamp body 12 is constituted of the tip face 12b1 of a rib 12b formed to be extended along its front end opening part 12a, the translucent cover 14 is enabled to be formed as a plate like member, and by this, the degree of freedom of a lighting fixture design is enhanced. Moreover, on the inner peripheral face and the outer peripheral face of the rib 12b, overhang faces 12b2, 12b3 overhung while stepped down against the tip face 12b1 of the rib 12b are respectively formed. By this, molten burrs B generated by the vibration welding at both sides of the tip face 12b1 of the rib 12b of the lamp body 12 are enabled to be inconspicuous by existence of the overhang faces 12b2, 12b3 positioned at its rearward side, and the design characteristics of the lighting fixture are protected from being damaged beforehand. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicular lamp in which a translucent cover is joined to a front end opening of a lamp body over substantially the entire circumference by vibration welding.

  In general, a vehicular lamp has a structure in which a translucent cover is joined to the front end opening of a lamp body over substantially the entire circumference, and vibration welding is known as one of the joining methods.

  In this vibration welding, in a state where the lamp body and the translucent cover are pressed against each other, one of them is linearly reciprocated in a direction perpendicular to the pressing direction, thereby generating frictional heat between the two, thereby It is melted and joined.

  Conventionally, a vehicular lamp manufactured using such vibration welding has a configuration in which legs are formed on the rear surface of the translucent cover, as described in, for example, “Patent Document 1”. The front end surface of the leg portion is set as a welding target surface.

JP-A-10-97803

  However, in the vehicular lamp in which the surface to be welded of the translucent cover is configured by the tip end surface of the leg portion as described above, there are the following problems.

  That is, if the leg portion is formed on the translucent cover, it is necessary to determine the design of the translucent cover on the assumption of the presence of the leg portion, so that the degree of freedom of the lamp design is limited accordingly. There is a problem.

  On the other hand, if the translucent cover is formed as a plate-like member, the degree of freedom of the lamp design can be increased. At this time, it is preferable that the surface to be welded of the lamp body is constituted by a tip end surface of a rib formed so as to extend along the front end opening of the lamp body, in order to ensure vibration welding. .

  However, in such a case, molten burrs are generated on both sides of the end face of the rib by vibration welding. At that time, since the surface on the inner peripheral side of the rib on the front surface of the lamp body is generally subjected to some surface treatment, the front surface of the lamp body subjected to this surface treatment in the state of the lamp front view. As a result, the molten burr appears as a silhouette. For this reason, the presence of molten burrs is conspicuous, and there is a problem that the design of the lamp is impaired in this respect.

  The present invention has been made in view of such circumstances, and in a vehicular lamp in which a translucent cover is joined to a front end opening of a lamp body over substantially the entire circumference by vibration welding, the design characteristics thereof are as follows. It is an object of the present invention to provide a vehicular lamp that can sufficiently secure the above.

  The present invention is intended to achieve the above object by devising the configuration of the lamp body.

That is, the vehicular lamp according to the present invention is
In a vehicular lamp in which a translucent cover is joined to the front end opening of the lamp body over substantially the entire circumference by vibration welding,
The surface to be welded of the lamp body is configured by a tip surface of a rib formed so as to extend along the front end opening of the lamp body,
An overhanging surface is formed on the inner peripheral surface of the rib so as to protrude in a step-down manner relative to the tip surface of the rib.

  The above-mentioned “projection surface” is formed so as to project in parallel to the tip surface of the rib if it is formed on the inner peripheral surface of the rib so as to project in a step-down manner relative to the tip surface. Alternatively, it may be formed so as to protrude in a direction slightly inclined with respect to the tip surface of the rib. At this time, there are no particular limitations on the specific values of the amount of protrusion of the “protruding surface” from the inner peripheral surface of the rib and the amount of step-down from the tip end surface of the rib.

  As shown in the above configuration, the vehicular lamp according to the present invention has a configuration in which a translucent cover is joined to the front end opening of the lamp body over substantially the entire circumference by vibration welding. The target surface is constituted by a tip end surface of a rib formed so as to extend along the front end opening, and an overhang projecting from the tip end surface of the rib in a step-down manner is formed on the inner peripheral surface of the rib. Since the surface is formed, the following effects can be obtained.

  That is, in the vehicular lamp according to the present invention, the surface to be welded of the lamp body is configured by the tip end surface of the rib formed so as to extend along the front end opening thereof, so that the translucent cover is a plate-like member. As a result, it is possible to increase the degree of freedom of the lamp design.

  In addition, the vehicular lamp according to the present invention has an overhanging surface that protrudes in a step-down manner from the tip end surface of the rib on the inner peripheral surface of the rib in the lamp body. Among the melt burrs generated on both sides of the tip end surface of the rib, the melt burrs generated on the inner peripheral side can be made inconspicuous due to the presence of the overhanging surface located on the rear side. Therefore, even when the surface treatment is performed on the inner peripheral side of the rib in the lamp body, the melt generated on the inner peripheral side of the rib is prevented by not performing the surface treatment on the protruding surface of the rib. The presence of burrs can be made inconspicuous. And thereby, it can prevent beforehand that the designability of a lamp is impaired.

  As described above, according to the present invention, in the vehicular lamp in which the translucent cover is joined to the front end opening of the lamp body over substantially the entire circumference by vibration welding, the design can be sufficiently ensured.

  In the above configuration, as described above, the amount of protrusion of the protruding surface from the inner peripheral surface of the rib is not particularly limited. However, if this amount of protrusion is set to a value of 1 mm or more, the following effects are obtained. be able to.

  That is, the lateral protrusion amount of the molten burr generated on the inner peripheral side of the rib varies depending on the circumferential position of the rib and becomes non-uniform, but the lateral protrusion amount is about 1 mm at the maximum. Therefore, by setting the overhanging amount of the overhanging surface to a value of 1 mm or more, it is possible to prevent molten burrs from protruding from the overhanging surface over substantially the entire length of the rib, thereby further improving the design of the lamp. Can do.

  In the above configuration, as described above, the step-down amount of the protruding surface from the tip end surface of the rib is not particularly limited. However, if this step-down amount is too small, the molten burr will be protruded from the rear surface of the translucent cover and the rib. If the amount of this step-down is too large, the overhanging surface will move away from the molten burr, and the presence of the molten burr will be conspicuous. . From such a viewpoint, it is preferable to set the amount of step-down from the tip end face of the rib of the overhanging surface to a value of 0.3 to 1.2 mm, and to a value of 0.5 to 0.8 mm. More preferred.

  In the above configuration, when a reflective coating is applied as a surface treatment to the inner peripheral region of the front surface of the lamp body, the presence of molten burrs generated on the inner peripheral side of the rib is particularly noticeable. Therefore, it is particularly effective to adopt the configuration of the present invention. Here, the “region on the inner peripheral side of the rib on the front surface of the lamp body” means the inner peripheral side of the inner peripheral surface of the portion protruding from the inner peripheral surface of the rib to the inner peripheral side in order to form a protruding surface. It means the area.

  In addition, the design on the front surface of the lamp body is completely different from the inner peripheral edge of the overhanging surface by applying the reflective coating to the inner peripheral region of the front surface of the lamp body. Can be. As a result, it is possible to make the presence of the molten burrs located between the rear surface and the projecting surface of the translucent cover less noticeable.

  In the above-described configuration, a protruding surface is formed on the outer peripheral surface of the rib so as to protrude downward with respect to the tip surface of the rib, and the protruding amount of the protruding surface is set to a value of 1 mm or more. With this configuration, it is possible to prevent the molten burrs generated on the outer peripheral side of the rib from protruding from the projecting surface over substantially the entire length of the rib, thereby further improving the design of the lamp.

The front view which shows the vehicle lamp which concerns on one Embodiment of this invention FIG. 2 is a detailed cross-sectional view taken along the line II-II in FIG. 1, showing the main part of the vehicular lamp, in which (a) is an unfinished state and (b) is a completed state. Detailed view of part III in Fig. 1

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view showing a vehicular lamp 10 according to an embodiment of the present invention as seen from the rear of the vehicle. 2 is a detailed cross-sectional view taken along the line II-II in FIG. 1, and shows the main part of the vehicular lamp 10, in which FIG. 2 (a) is in an unfinished state and FIG. 2 (b) is in a completed state. FIG.

  As shown in these drawings, a vehicular lamp 10 according to the present embodiment is a rear combination lamp disposed at a rear end portion of a vehicle, and is joined to a lamp body 12 and a front end opening portion 12a of the lamp body. The translucent cover 14 is provided, and a lamp chamber 16 is formed in the interior.

  The front end opening 12a of the lamp body 12 and the translucent cover 14 are joined over the entire circumference of the front end opening 12a of the lamp body 12 by vibration welding. In this vibration welding, the lamp body 12 and the translucent cover 14 are pressed against each other in the lamp front-rear direction (that is, the vehicle front-rear direction) while the lamp body 12 and the translucent cover 14 are held by jigs, respectively. The body 12) has a frequency of about 240 Hz and an amplitude of about 0.75 mm (that is, about 1.5 mm as a whole) in the direction indicated by the arrow in FIG. 2A (that is, the vehicle width direction orthogonal to the pressing direction). This is done by reciprocating linearly.

  The translucent cover 14 is a plate-like member made of thermoplastic resin (for example, made of acrylic (PMMA) resin), and is formed so as to extend along a vertical plane extending in the vehicle width direction. And in this translucent cover 14, the outer peripheral edge part 14a1 of the rear surface 14a is set as a welding object surface in the case of vibration welding.

  On the other hand, the lamp body 12 is a member made of a thermoplastic resin (for example, made of ABS resin), and a rib 12b is formed in the front end opening 12a so as to protrude to the front side of the lamp over the entire circumference. And in this lamp body 12, the front end surface 12b1 of the rib 12b is set as a welding target surface at the time of vibration welding. At this time, the front end surface 12b1 of the rib 12b is formed with a width of about 2 mm along a vertical surface extending in the vehicle width direction. Further, the formation position of the rib 12b is set so that the outermost peripheral edge of the translucent cover 14 is positioned at a position about 1.5 mm away from the outer peripheral edge of the front end surface 12b1. Thus, during vibration welding, when the light-transmitting cover 14 reciprocates linearly with an amplitude of about 0.75 mm, the outer peripheral edge portion 14a1 of the rear surface 14a is always slidably contacted with the tip surface 12b1 of the rib 12b. Heat is generated efficiently.

  However, the rib 12b is not a simple shape like the rib 12b 'shown by a two-dot chain line in FIG. 2, and is stretched down on the inner and outer peripheral surfaces of the rib 12b with respect to the tip surface 12b1 of the rib 12b. The projecting surfaces 12b2 and 12b3 are formed, respectively. In addition, since the projecting surfaces 12b2 and 12b3 are formed at the base end portion of the rib 12b, a concave portion 12b4 is formed on the outer peripheral surface thereof so as not to increase the thickness of the rib 12b. Has been.

  At this time, both the overhanging amount W1 of the overhanging surface 12b2 from the inner peripheral surface of the rib 12b and the overhanging amount W2 of the overhanging surface 12b3 from the outer peripheral surface of the rib 12b are values of 1 mm or more (for example, a value of about 1.2 mm). Is set to Further, the step-down amounts G1 and G2 from the distal end surface 12b1 of the ribs 12b of these overhang surfaces 12b2 and 12b3 are both set to a value of 0.3 to 1.2 mm (for example, a value of about 0.6 mm). Yes.

  A region on the inner peripheral side of the front surface 12c of the lamp body 12 relative to the rib 12b (that is, an inner peripheral surface 12d of a portion protruding from the inner peripheral surface of the rib 12b to the inner peripheral side in order to form the extended surface 12b2 A reflective coating C is applied to the peripheral region. At this time, the reflective coating C is also applied to the inner peripheral surface 12d of the portion protruding from the inner peripheral surface of the rib 12b.

  FIG. 3 is a detailed view of part III in FIG.

  As shown also in the figure, molten burrs B are generated on both sides of the front end surface 12b1 of the rib 12b in the lamp body 12 due to the vibration welding, but the lateral protrusion amount is in the circumferential direction of the rib 12b. It depends on the position. At this time, the lateral protrusion amount of the molten burr B varies within the range of about 0.3 to 1 mm in both the lateral protrusion amount D1 toward the inner peripheral side and the lateral protrusion amount D2 toward the outer peripheral side. However, it has been confirmed by the experiments of the present inventors. On the other hand, since the overhang amounts W1 and W2 of the overhang surfaces 12b2 and 12b3 are set to a value of 1 mm or more, the molten burr B hardly protrudes from the overhang surfaces 12b2 and 12b3.

  As described in detail above, the vehicular lamp 10 according to the present embodiment has a configuration in which the translucent cover 14 is joined to the front end opening 12a of the lamp body 12 over the entire circumference by vibration welding. The surface to be welded of the lamp body 12 is constituted by a front end surface 12b1 of a rib 12b formed so as to extend along the front end opening 12a, and an inner peripheral surface of the rib 12b has a front end of the rib 12b. Since the overhanging surface 12b2 projecting down from the surface 12b1 is formed, the following operational effects can be obtained.

  That is, in the vehicular lamp 10 according to the present embodiment, the welding target surface of the lamp body 12 is configured by the front end surface 12b1 of the rib 12b formed so as to extend along the front end opening 12a. The light cover 14 can be formed as a plate-like member, and thereby the degree of freedom of the lamp design can be increased.

  In addition, in the vehicular lamp 10 according to the present embodiment, an overhanging surface 12b2 is formed on the inner peripheral surface of the rib 12b of the lamp body 12 so as to project in a step-down manner with respect to the tip surface 12b1 of the rib 12b. Therefore, among the molten burrs B generated on both sides of the front end surface 12b1 of the rib 12b of the lamp body 12 by vibration welding, the molten burrs B generated on the inner peripheral side are conspicuous by the presence of the protruding surface 12b2 positioned on the rear side. Can not be.

  At that time, in the vehicular lamp 10 according to the present embodiment, the surface treatment is performed on the inner peripheral region of the lamp body 12 with respect to the rib 12b, but the protruding surface 12b2 of the rib 12b is subjected to the surface treatment. Therefore, the presence of the molten burr B generated on the inner peripheral side of the rib 12b can be made inconspicuous. And thereby, it can prevent beforehand that the designability of a lamp is impaired.

  As described above, according to this embodiment, the design of the vehicular lamp 10 in which the translucent cover 14 is joined to the front end opening 12a of the lamp body 12 over substantially the entire circumference by vibration welding is sufficiently ensured. be able to.

  At this time, in the present embodiment, since the amount of protrusion W1 of the protruding surface 12b2 of the rib 12b from the inner peripheral surface of the rib 12b is set to a value of 1 mm or more, the following effects can be obtained. it can.

  That is, the lateral protrusion amount D1 of the molten burr B generated on the inner peripheral side of the rib 12b varies depending on the position of the rib 12b in the circumferential direction and is not uniform, but the lateral protrusion amount D1 is about 1 mm at the maximum. It is. Therefore, by setting the overhanging amount W1 of the overhanging surface 12b2 to a value of 1 mm or more, the molten burr B can be prevented from protruding from the overhanging surface 12b2 over the entire length of the rib 12b. The design can be further enhanced.

  In the present embodiment, the step-down amount G1 of the protruding surface 12b2 of the rib 12b from the tip surface 12b1 of the rib 12b is set to a value of 0.3 to 1.2 mm. By being too small, it is possible to prevent the molten burr B from being sandwiched between the rear surface 14a of the translucent cover 14 and the projecting surface 12b2 of the rib 12b and protruding from the inner peripheral edge of the projecting surface 12b2. If the step-down amount G1 is too large, it is possible to prevent the protruding surface 12b2 from moving backward from the molten burr B and the presence of the molten burr B being easily noticeable.

  In addition, in the present embodiment, the reflective coating C is applied as a surface treatment on the inner peripheral side of the front surface 12c of the lamp body 12 with respect to the rib 12b, so that the molten burr B is formed on the inner peripheral side of the rib 12b. When it occurs, its presence becomes particularly noticeable, but this can be prevented beforehand.

  In addition, the reflective coating C is applied to the inner peripheral side of the front surface 12c of the lamp body 12 with respect to the rib 12b in this manner, so that the design of the front surface 12c of the lamp body 12 can be changed to the inner peripheral edge of the overhanging surface 12b2. Can be completely different. As a result, the presence of the molten burr B located between the rear surface 14a of the translucent cover 14 and the overhanging surface 12b2 can be made less noticeable.

  Further, in the present embodiment, an overhanging surface 12b3 is formed on the outer peripheral surface of the rib 12b so as to protrude in a step-down manner relative to the tip end surface 12b1 of the rib 12b, and the overhanging amount W2 of the overhanging surface 12b3 is as follows. Since the value is set to 1 mm or more, the molten burr B generated on the outer peripheral side of the rib 12b can be prevented from protruding from the protruding surface 12b3 over the entire length of the rib 12b. It is possible to further improve the properties.

  In the above-described embodiment, the translucent cover 14 has been described as being joined to the front end opening 12a of the lamp body 12 over the entire circumference by vibration welding. Even if it is a case where it is the structure which is not carried out, the effect similar to the said embodiment can be acquired by employ | adopting the structure of the said embodiment.

  Moreover, in the said embodiment, although demonstrated that the reflection coating C was given also to the internal peripheral surface 12d of the part which has protruded from the internal peripheral surface of the rib 12b in the lamp body 12, Even when the reflective coating C is not applied, the same effects as those of the above embodiment can be obtained.

  Furthermore, in the said embodiment, although demonstrated as what the vibration direction at the time of vibration welding is a vehicle width direction, also when it is a direction other than this, by adopting the structure of the said embodiment, the said embodiment and Similar effects can be obtained.

  In addition, the numerical value shown as a specification in the said embodiment is only an example, and of course, you may set these to a different value suitably.

DESCRIPTION OF SYMBOLS 10 Vehicle lamp 12 Lamp body 12a Front end opening part 12b, 12b 'Rib 12b1 Tip surface (surface to be welded)
12b2, 12b3 Overhanging surface 12b4 Recessed portion 12c Front surface 12d Inner peripheral surface 14 Translucent cover 14a Rear surface 14a1 Outer peripheral edge (surface to be welded)
16 Light room B Molten burr C Reflective coating

Claims (5)

In a vehicular lamp in which a translucent cover is joined to the front end opening of the lamp body over substantially the entire circumference by vibration welding,
The surface to be welded of the lamp body is configured by a tip surface of a rib formed so as to extend along the front end opening of the lamp body,
A vehicular lamp characterized in that an overhanging surface is formed on the inner peripheral surface of the rib so as to project in a step-down manner relative to the tip end surface of the rib.   2. The vehicular lamp according to claim 1, wherein an amount of protrusion of the protruding surface from the inner peripheral surface of the rib is set to a value of 1 mm or more.   The vehicular lamp according to claim 1 or 2, wherein a step-down amount of the projecting surface from the tip end surface of the rib is set to a value of 0.3 to 1.2 mm.   The vehicular lamp according to any one of claims 1 to 3, wherein a reflective coating is applied to a region on the inner peripheral side of the rib on the front surface of the lamp body. On the outer peripheral surface of the rib, an overhanging surface that protrudes in a step-down manner from the tip end surface of the rib is formed,
The vehicular lamp according to any one of claims 1 to 4, wherein a protruding amount of the protruding surface from the outer peripheral surface of the rib is set to a value of 1 mm or more.

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