JP2013114756A - Light for vehicle, and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light for vehicle having a resin product without uneven creping.SOLUTION: In the light for vehicle, the resin product 10 has a design surface 10a exposed in front of the light, and a non-design surface 10b arranged on a back of the design surface 10a. A creping portion 21 composed of tiny irregularities is provided to the design surface 10a, and uneven creping suppressing protrusions 22 supported on a die 40 at the time of molding die forming and restraining surface contraction of the creping portion 21 are arranged in the vicinity of an outer edge of a zone corresponding to the creping portion 21 out of the non-design surface 10b.

Description

  The present invention relates to a vehicular lamp provided with a resin product in which a texture is formed on a design surface, and a manufacturing method thereof.

  Conventionally, various vehicle lamps having different appearances have been proposed. In recent years, in addition to changing the configuration of the vehicular lamp such as the arrangement of the light source and the shape of the reflector, it has been proposed that the design surface of the member exposed to the front of the lamp, such as an extension, is formed to improve the design. . A wrinkle is a portion where minute irregularities are formed on the surface, and exhibits a matte feeling by irregularly reflecting light.

  In Patent Document 1, when forming a resin product such as a reflector or an extension, such a texture is formed by using a mold having a micro uneven surface and transferring the micro uneven surface of the mold to the resin product. Propose to do.

JP 2008-71556 A

  However, when a texture is formed as in Patent Document 1, a texture unevenness may occur in a resin product. If grainy unevenness occurs, the appearance will be poor and the yield of resin products will be reduced.

  Then, an object of this invention is to provide the vehicle lamp provided with the resin product in which generation | occurrence | production of the grain unevenness was suppressed, and its manufacturing method.

In order to achieve the above object, according to the present invention,
A vehicular lamp provided with resin parts arranged around a light source,
The resin component has a design surface exposed to the front of the lamp, and a non-design surface provided on the back surface of the design surface,
The design surface is provided with a textured portion made of minute irregularities,
The non-designed surface is provided with an uneven unevenness suppressing protrusion that is supported by a mold during mold forming and suppresses surface shrinkage of the textured part in the vicinity of the outer edge of the region corresponding to the textured part. A vehicular lamp is provided.

According to the present invention, in the vehicle lamp,
At least a pair of the grain unevenness suppressing protrusions may be provided at positions facing each other across a region corresponding to the grain part in the non-design surface.

According to the present invention, in the vehicle lamp,
A plurality of the embossed portions are formed on the design surface,
In the non-design surface, the grain unevenness suppressing protrusion may be provided at a boundary of a region corresponding to each grain part.

According to the present invention, in the vehicle lamp,
It is good also considering the thickness of the said embossing suppression protrusion part as 0.2 mm or more and below the thickness of the said resin component of the site | part in which the said embossing part was formed.

According to the present invention, in the vehicle lamp,
An additional protrusion is provided inside the region corresponding to the embossed portion of the non-design surface,
The additional protruding portion may be formed smaller than the wrinkle unevenness suppressing protruding portion.

Also according to the invention,
A method for manufacturing a resin component for a vehicular lamp, comprising a design surface provided with a textured portion and a non-design surface on the back of the design surface,
A design surface side mold having a micro uneven surface and a non-design surface side mold having a recess on the molding surface side forming a cavity for forming the resin part between the design surface side mold are prepared. Mold preparation process,
A mold arrangement step of arranging the design surface side mold and the non-design surface side mold so as to form the cavity between the design surface side mold and the non-design surface side mold;
A textured part forming step of pouring a raw material resin into the cavity to transfer the textured part by transferring the micro uneven surface;
A cooling step of cooling the raw resin to cure the resin component,
In the cooling step, the non-design surface-side mold is brought into contact with a wrinkle unevenness-suppressing protrusion formed by the concave portion to suppress shrinkage of the wrinkle portion due to cooling of the resin component. A method for manufacturing a lamp is provided.

  According to the vehicular lamp according to the present invention, the wrinkle unevenness suppressing protrusion acts to suppress the surface shrinkage of the wrinkled portion that occurs with the cooling of the resin during molding. Therefore, it is possible to suppress the occurrence of grain unevenness caused by thermal shrinkage accompanying cooling during mold molding.

  Further, according to the method for manufacturing a resin component for a vehicular lamp according to the present invention, the wrinkle unevenness suppressing protrusion formed by the concave portion suppresses the shrinkage of the wrinkle portion accompanying cooling of the resin product. The generated uneven grain can be suppressed.

1 is a perspective view of a vehicular lamp according to an embodiment of the present invention. It is sectional drawing of the surface containing the low beam lamp unit of the vehicle lamp shown in FIG. It is a schematic diagram explaining the generation | occurrence | production mechanism of a grain unevenness. It is the elements on larger scale of the extension of the vehicle lamp shown in FIG. It is a schematic diagram which shows the manufacturing process of the extension shown in FIG. It is the elements on larger scale of the extension of the vehicle lamp shown in FIG. It is the elements on larger scale of the extension of the vehicular lamp which concerns on the 1st modification of this invention. It is the elements on larger scale of the extension of the vehicular lamp which concerns on the 2nd modification of this invention. It is a partial expansion perspective view of the extension of the vehicular lamp concerning the 3rd modification of the present invention.

(overall structure)
Hereinafter, a vehicular lamp according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a perspective view of a vehicular lamp according to an embodiment of the present invention. As shown in FIG. 1, the vehicular lamp includes a lamp body 1 having an opening that opens to the front of the lamp, and an outer cover 2 made of a transparent resin. The outer cover 2 is disposed so as to close the opening of the lamp body 1 from the front, and a lamp chamber is formed between the lamp body 1 and the outer cover 2.

  A high beam lamp unit 3 capable of irradiating a high beam and a low beam lamp unit 4 capable of irradiating a low beam are disposed in the lamp chamber. FIG. 2 is a vertical sectional view of the vehicular lamp in a cross section including the low beam lamp unit 4. As shown in FIG. 2, the low beam lamp unit 4 is a projector-type lamp unit, and includes a light source 4b made of an LED or the like, a projection lens 4a, a reflector 4c, and the like. The high beam lamp unit 3 (see FIG. 1) is configured similarly to the low beam lamp unit 4. Further, as shown in FIG. 1, a turn signal lamp 5 is provided in the vicinity of the end in the vehicle width direction in the lamp chamber.

  As shown in FIG. 1, the lamp body 1 is exposed in the lamp chamber with the projection lens 3 a of the high beam lamp unit 3, the projection lens 4 a of the low beam lamp unit 4 and the turn signal lamp 5 exposed from the front side of the lamp. An extension 10 (resin part) for covering is provided. The extension 10 is a resin member formed from a crystalline resin such as PBT (polybutylene terephthalate) or PET (polyethylene terephthalate).

  The extension 10 includes a design surface 10a exposed to the front side of the lamp, and a non-design surface 10b (see FIG. 2) that is not visible from the front of the lamp opposite to the design surface 10a. On the design surface 10a, a smooth and glossy mirror surface portion 20 and a low gloss gloss 21 are formed. The embossed portion 21 is formed as a minute uneven surface, and exhibits a matte feeling by irregularly reflecting light. The embossed portion 21 can be composed of, for example, dot-shaped minute projections and minute recesses, or can be composed of minute ridges and valleys extending in one direction. In the present embodiment, almost the entire design surface 10a of the extension 10 is formed as the mirror surface portion 20, and the embossed portion 21 is formed on a part of the design surface 10a. Moreover, as shown in FIG. 2, the non-design surface 10b is provided with a rib 22 extending toward a region not exposed in front of the lamp.

  As shown in FIGS. 1 and 2, the extension 10 surrounds the bottom surface portion 11 where the projection lens 4 a of the low beam lamp unit 4 and the projection lens 3 a of the high beam lamp unit 3 and the turn signal lamp 5 are exposed, and the bottom surface portion 11. And an inclined portion 12 extending forward from the outer edge. Further, the bottom surface portion 11 includes a first cylindrical portion 13 and a second cylindrical portion 14 that surround the projection lens 3a of the high beam lamp unit 3 and the projection lens 4a of the low beam lamp unit 4 and project forward from the bottom surface portion 11, respectively. Is provided. The design surface 10a of the first cylindrical portion 13 and the second cylindrical portion 14 is an inclined surface whose diameter increases from the projection lenses 3a and 4a toward the front.

  The first textured portion 21 a is formed in a substantially rectangular shape at a plurality of locations on the design surface 10 a of the second cylindrical portion 14. The plurality of first textured portions 21 a are arranged radially with respect to the optical axis of the low beam lamp unit 4 when viewed from the front of the lamp. In addition, the plurality of first wrinkle portions 21 a are radially divided by the plurality of mirror surface portions 20.

  In addition, the second textured portion 21 b is provided in a part of a region located below the first cylindrical portion 13 and the second cylindrical portion 14 in the frame-shaped inclined portion 12. The second wrinkle portion 21b is formed in a belt shape extending in the vehicle width direction. The 2nd wrinkle part 21b differs in surface roughness from the 1st wrinkle part 21a, and exhibits the external appearance different from the 1st wrinkle part 21a.

  As described above, in the vehicular lamp according to the present embodiment, the mirror surface portion 20, the first wrinkle portion 21a, and the second wrinkle portion 21b are mixed in the design surface 10a of the extension 10, so that the appearance of the vehicular lamp can be improved. Has been improved. In the following description, when the first wrinkle portion 21a and the second wrinkle portion 21b are not particularly distinguished, they are simply referred to as the wrinkle portion 21.

(Shibomura generation mechanism)
In the vehicular lamp configured as described above, occurrence of grain unevenness in the embossed portion 21 is not preferable because the appearance of the vehicular lamp is impaired. In general, the embossed portion 21 is formed by transferring minute irregularities provided on a mold onto a resin product during injection molding of a resin product such as the extension 10. At this time, if the desired minute unevenness is not transferred when forming the embossed portion 21, irregular reflection of light does not occur uniformly at the embossed portion 21, and if the light is strongly reflected in a specific direction, In some cases, the difference in reflectance between the two may result in appearance of a light and dark stripe pattern. This striped pattern that appears unintentionally is called Shibomura.

  Therefore, the present inventors have found that shibomura is generated by the following mechanism. FIG. 3 is a schematic diagram showing how the extension 10 according to the comparative example is molded.

  Generally, a resin product such as the extension 10 is prepared and produced by molding. When the resin is cooled in order to cure the liquid resin injected into the cavity of the mold 30 during the molding of the mold, heat shrinkage occurs in the resin. Since the extension 10 is formed as a plate-like member, the dimension in the surface direction (left-right direction in the drawing) is larger than the thickness direction. For this reason, a large contractive force acts on the resin in the surface direction.

  During such mold forming, the resin may partially stick to the surface of the mold 30 (area A in the figure). For example, if a part of the mold has a low temperature, the resin adheres to the low temperature region of the mold 30, or if a resin having a high flow velocity is strongly pressed against the surface of the mold 30 near the inlet, A part sticks strongly to the surface of the mold 30. In particular, the texture transfer portion 31 made of minute irregularities forming the texture portion 21 has a large contact area with the resin, and the resin is easily fixed. For this reason, the embossed transfer part 31 tends to stick the resin to the mold 30.

  When the resin in the cavity cools and contracts, the resin deforms and moves so as to be drawn toward the portion that is strongly attached to the surface of the mold 30. When the resin moves in this manner, the convex portion 21 s of the formed embossed portion 21 comes into contact with the convex portion 31 a of the embossed transfer portion 31 of the mold 30 and deforms. As a result, as shown in FIG. 3, the attracted convex portion 21 s is formed in an inclined state. The convex portion 21s formed in such a manner reflects light in a specific direction. As a result, the region of the inclined convex portion 21 s is visually recognized as a grainy stripe having a stripe pattern.

  In particular, as described above, the embossed portion 21 tends to stick to the embossed transfer portion 31 of the mold 30, so that the resin moves to gather around the embossed portion 21. In this case, concentric wrinkle unevenness centered on the region attached to the mold 30 is generated in the wrinkle portion 21. Since the concentric wrinkles are conspicuous, the appearance of the extension 10 is greatly impaired. In addition, if the entire resin shrinks non-uniformly due to variations in the temperature of the mold 30, the convex portion 21s is deformed at a different angle for each region having a different shrinkage amount. In this case, light is reflected in a specific direction for each region having a different contraction amount, and stripe-like unevenness is visually recognized as a whole.

  Note that wrinkle unevenness is caused by deformation of the minute convex portion 21 s of the wrinkle portion 21, so that even if resin movement occurs in the mirror surface portion 20, wrinkle unevenness does not occur. This is because the mirror surface portion 20 having a smooth surface does not deform even when the resin moves while contacting the mold 30.

(Rib action)
Therefore, the present inventors conducted experiments by changing the molding conditions such as the cooling rate of the resin, the pressure for holding the resin at a constant pressure in the mold, the injection speed of the resin into the mold, and the like. I tried to find the conditions to suppress. However, even if the molding conditions are set in various ways, the generation of grain unevenness cannot be effectively suppressed. Therefore, the present inventors examined adding a structure for suppressing the surface shrinkage of the embossed portion 21 to the extension 10 instead of changing the molding conditions.

  FIG. 4 is an enlarged view of a part of the design surface 10a provided on the second cylindrical portion 14 of the extension 10 shown in FIG. 1 as seen through from the normal direction. In FIG. 4, the rib 22 formed in the non-design surface 10b which is the back surface of the design surface 10a is shown with the broken line.

  As shown in FIG. 4, a substantially rectangular first wrinkle portion 21 a is formed on the design surface 10 a of the second cylindrical portion 14 of the extension 10 so as to extend radially with respect to the optical axis of the low beam lamp unit 4. Yes. Moreover, the rib 22 is provided in the non-design surface 10b of the 2nd cylindrical part 14 in the outer edge vicinity of the area | region 21t (back surface area | region of the 1st embossed part 21a) corresponding to this 1st embossed part 21a. More specifically, the rib 22 is formed in a linear shape along the outer edge of the first embossed portion 21a. The ribs 22 are opposed to each other across the region 21t of the non-design surface 10b, and are provided at positions symmetrical with respect to the region 21t.

  The manufacturing method of the extension 10 provided with the first embossed part 21a to which the manufacturing method according to this embodiment is applied will be described with reference to FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4, and arrows F1 and F2 in the drawing indicate stress applied to the resin when the extension 10 is molded. In FIG. 5, the fine unevenness of the embossed transfer portion 41 of the mold is exaggerated and drawn larger than the actual size.

  In order to produce the extension 10, first, a lower mold 40 having a textured transfer portion 41 made of minute irregularities and a rib 22 near the outer edge of a region facing the textured transfer portion 41 of the lower mold 40 are formed. The upper mold 50 provided with the rib forming recess 51 is prepared. Next, the cavity C is formed by combining the lower mold 40 and the upper mold 50, the raw material resin is poured into the formed cavity C, and the resin is cooled and cured to produce the extension 10. It is preferable to provide a resin injection port (gate) in the rib forming recess 51 because a gate mark remains on the rib 22 that does not affect the appearance of the extension 10.

  As shown in FIG. 5, when the resin is cooled, the embossed portion 21 is formed by the embossed transfer portion 41, the rib 22 is formed by the rib forming recess 51, and these are integrally formed as the extension 10. On the non-design surface 10 b of the extension 10, a region 21 t corresponding to the first embossed portion 21 a is sandwiched between a pair of ribs 22. Accordingly, a reaction force F2 is generated by the pair of ribs 22 with respect to the compression force F1 acting on the resin during cooling. Since the pair of ribs 22 are firmly supported by the side wall 53 of the upper mold 50 sandwiched between them, the ribs 22 are not deformed by the compressive force F1.

  Therefore, even if the compression force F1 acts to shrink the entire surface of the resin as illustrated, the rib 22 generates a reaction force F2 so as to prevent the movement of the embossed portion 21. Thereby, the compressive force F1 is canceled by the reaction force F2, and the convex portion of the embossed portion 21 is not deformed due to the movement of the resin. Therefore, according to the extension 10 of the vehicular lamp according to the present embodiment, the occurrence of grain unevenness can be suppressed by providing the rib 22 on the non-design surface 10b. The surface contraction is contraction in a direction perpendicular to the thickness direction of the extension 10.

  In particular, according to the extension 10 of the vehicular lamp according to the present embodiment, as shown in FIG. 4, the pair of ribs 22 are provided symmetrically with respect to the region 21 t corresponding to the embossed portion 21, and the region 21 t is a pair of ribs 22. It is sandwiched between. As a result, even if a part of the embossed portion 21 sticks to the mold and a compressive force acts on the resin so that the embossed portion 21 is attracted to the center, the pair of ribs 22 exert reaction force from each side. Can be generated. Thereby, generation | occurrence | production of a grain unevenness can be suppressed over the grain part 21 whole.

  In addition, if the rib 22 is formed on the back surface of the embossed portion 21, uneven embossing may occur in a region corresponding to the rib 22 of the design surface 10a. Therefore, as shown in FIG. 4, it is preferable that the ribs 22 be provided outside the outer edge of the region 21 t corresponding to the embossed portion 21 at a predetermined interval and in the region corresponding to the mirror surface portion 20. As described above, the mirror surface portion 20 does not affect the appearance of the surface even if the resin moves due to cooling. Moreover, it is preferable that the space | interval from the outer edge of the area | region 21t corresponding to the embossed part 21 is set so large that the thickness of the extension 10 of the site | part in which the embossed part 21 was formed is large.

  Moreover, it is preferable that the thickness t (refer FIG. 5) of the rib 22 is 0.2 mm or more and below the thickness T of the extension 10 of the site | part in which the embossed part 21 was formed. If the thickness of the rib 22 is smaller than 0.2 mm, the compression force F1 cannot be received by the rib 22. Further, if the thickness is larger than the thickness T of the extension 10, sink marks are generated at positions corresponding to the ribs 22 of the design surface 10a at the time of mold forming, and the extension 10 having a good appearance cannot be formed.

  As described above, the rib 22 generates a reaction force F2 with respect to the compression force F1 when the resin is cooled. For this reason, if the extension 10 is taken out from the molds 40 and 50 before the resin is completely cured, the rib 22 may be bent in the opposite direction to the direction in which the compression force F1 acts. However, since the rib 22 is provided on the non-design surface 10b side that is not exposed in front of the lamp, the curved rib 22 does not deteriorate the appearance of the vehicular lamp.

  Further, when the extension 10 is formed of a crystalline resin having a molding shrinkage ratio of 10/1000 to 20/1000, which is relatively large, the resin is easily contracted, so that uneven wrinkles are likely to occur. However, like the extension 10 of the vehicular lamp according to the present embodiment, by forming the ribs 22 on the non-design surface 10b, the occurrence of grain unevenness can be effectively suppressed. When a crystalline resin is used, the extension 10 can be formed thin because the viscosity of the resin is low.

  In addition, when the embossed portion 21 is formed as a minute uneven surface having a surface roughness Ra (arithmetic average surface roughness) of 1 to 200 μm, the embossed unevenness is particularly noticeable when the embossed unevenness occurs. For this reason, conventionally, the design of the surface roughness of the embossed portion 21 has been restricted. However, according to the extension 10 of the vehicular lamp according to the present embodiment, unevenness is unlikely to occur, and thus such design restrictions do not occur. Therefore, various extensions 10 can be designed. Moreover, when this surface roughness is set, the textured portion 21 having good appearance and good transferability of the minute unevenness of the textured portion 21 can be obtained. The surface roughness Ra of the embossed portion 21 is preferably 1 to 100 μm, and more preferably Ra is 5 to 50 μm.

  Moreover, it is preferable that the rib 22 is provided perpendicularly from the non-design surface 10 b so that the rib 22 is reliably supported by the side wall 53 of the upper mold 50.

<Second wrinkle part>
In addition, the shape and formation position of the rib 22 which suppress wrinkle unevenness are not restricted to the above-mentioned example. 6 is an enlarged view of the vicinity of the second embossed portion 21b formed on a part of the inclined portion 12 of the extension 10 and is similar to FIG.

  As shown in FIGS. 2 and 6, the rib 22 provided in the vicinity of the second wrinkle portion 21b is provided on the back side of the mirror surface portion 20 located on the front side of the lamp of the second wrinkle portion 21b. The ribs 22 are formed in a linear shape extending in a direction perpendicular to the extending direction of the second embossed portion 21b, and a plurality of ribs 22 are formed along the extending direction of the second embossed portion 21b. Also with such ribs 22, the compressive force F <b> 1 in the surface direction that acts when the extension 10 is molded is received between the plurality of ribs 22, so that the occurrence of grain unevenness can be suppressed.

<First modification>
FIG. 7 is a partially enlarged view of the extension 10 of the vehicular lamp according to the first modification of the present embodiment. In the present embodiment, a mirror surface portion 20 and two kinds of embossed portions 21c and 21d having different surface roughness are formed on the design surface 10a. Two kinds of embossed portions 21c and 21d are formed adjacent to each other, and a rib 22 is provided on the back surface (non-design surface 10b) of the boundary portion 16. In this way, when the grain portions 21c and 21d having different appearances are formed adjacent to each other, even if the grain unevenness occurs at the boundary portion 16, it is difficult to visually recognize. For this reason, you may provide the rib 22 in the area | region of the non-design surface 10b corresponding to the boundary part 16 of several embossed parts 21c and 21d from which an external appearance differs.

  Moreover, in the example shown in FIG. 7, the rib 22 is provided so that the area | region corresponding to the embossed parts 21c and 21d of the non-design surface 10b may be enclosed. Thus, the reaction force F2 can be applied from all directions by the rib 22 to the compression force F1 acting on the resin so as to draw the embossed portions 21c and 21d around the center. As a result, it is possible to effectively suppress the occurrence of grain unevenness over the grain parts 21c and 21d.

<Second modification>
In the above-described embodiment, the substantially rectangular embossed portion 21 has been described. However, the present invention is not limited to this example. FIG. 8 is a partially enlarged view of the extension 10 of the vehicular lamp according to the second modification of the present invention. The embossed portion 21e of the extension 10 shown in FIG. 8 is formed in a substantially elliptical shape, and the ribs 22 are provided along the outline shape of the embossed portion 21e. Thus, by providing the rib 22 having a shape along the embossed portion 21e, the occurrence of embossed unevenness can be suppressed regardless of the shape of the embossed portion 21e.

  Further, as illustrated, the rib 22 may be formed so as to intermittently surround the outer shape of the region corresponding to the embossed portion 21e without being continuously surrounded. Even if the ribs 22 are formed in this way, the occurrence of grain unevenness can be suppressed.

<Third modification>
Moreover, although the above-mentioned embodiment gave and demonstrated the example in which the embossed part 21 was provided on the same surface, this invention is not limited to this example. FIG. 9 is a partially enlarged perspective view of the extension 10 of the vehicular lamp according to the third modification of the present embodiment.

  The extension 10 of the vehicular lamp according to the third modified example shown in FIG. 9 includes a design surface 10 a composed of two surfaces intersecting at a bent portion 17. In this way, when the embossed portions 21f and 21g are formed on the two design surfaces 10a connected via the bent portion 17, the ribs 22 may be provided on the non-design surface 10b side of the bent portion 17. This is because the vicinity of the bent portion 17 of the design surface 10a is difficult to visually recognize from the outside, and is not conspicuous even if a grainy unevenness occurs in this region. In this modified example, the valley side of the bent portion 17 is the design surface 10a and the rib 22 is provided on the mountain side. However, the valley surface of the bent portion 17 is the design surface 10a and the rib 22 is provided on the valley side. good.

In the present modification, no rib is provided so as to sandwich the embossed portions 21f and 21g, and the rib 22 is provided only on one side of the embossed portions 21f and 21g. Even if the ribs 22 are formed in this way, the occurrence of graininess can be suppressed. In this case, when molding the mold, the entire embossed portions 21f and 21g are moved toward the rib 22 by the compression force F1 due to cooling, and the convex portions 21s of the embossed portions 21f and 21g are deformed over the entire embossed portions 21f and 21g. . Therefore, since the convex portion 21 s is uniformly deformed, the deformed convex portion 21 s is not visually recognized as a grainy unevenness.

  As mentioned above, although this invention was mentioned taking the embodiment and the 1st-3rd modification as an example, this invention is not limited to these examples. For example, in the above-described example, the rib 22 is used as a portion that suppresses unevenness of the grain. However, if a reaction force can be generated against the contraction force at the time of mold forming, a protrusion or a convex portion is used instead of the rib 22. You may do it.

  In the above-described example, the example in which the surface of the resin reflector is used as it is as the design surface 10a has been described. However, the design surface 10a formed with the mirror surface portion 20 and the textured portion 21 is subjected to metal vapor deposition. , Glossiness may be enhanced.

  In the above-described example, the extension 10 is described as an example of the resin part. However, the present invention is arranged around the light source such as the inner lens, the outer lens, the reflector, and the lamp body, and the embossed portion 21 is provided on the design surface 10a. It can be applied to resin parts in general. For example, in a parabolic optical system vehicular lamp, a textured portion is provided in a region that does not contribute to the light distribution of the reflector. Alternatively, when the inner surface of the lamp body is exposed to the front of the lamp, a textured portion is provided on the design surface of the lamp body. Even in such a case, by providing the rib 22 in the region that is not exposed in front of the lamp, it is possible to suppress the occurrence of unevenness in the embossed portion.

  Further, the rib 22 that suppresses the occurrence of grain unevenness as described above may have a function as a reinforcing rib 22 that reinforces the rigidity of the extension 10. Alternatively, when the extension 10 is fixed to the lamp body 1 with a bolt, a boss portion that receives the bolt may be provided on the non-design surface 10b of the extension 10, and this boss portion may function as a wrinkle unevenness suppressing protrusion. In addition, a projection such as a pin used when positioning the extension 10 with respect to the lamp body 1 may function as a wrinkle unevenness suppressing protrusion. With this configuration, it is not necessary to form separate ribs 22 for each purpose of suppressing unevenness, fixing the extension 10, and positioning the extension 10, and the structure of the extension 10 is simplified. be able to.

  In addition, you may provide the protrusion part for reinforcement of the extension 10 in the inside of the area | region corresponding to the embossed part 21 among the non-design surfaces 10b. This protrusion is set to be smaller than the rib 22 provided on the outer edge of the region corresponding to the embossed portion 21 for suppressing embossed unevenness. When the reinforcing protrusion is provided inside the region corresponding to the embossed portion 21 of the non-design surface 10b, the embossed portion 21 is caused by the reinforcing protrusion, or the unevenness is generated. There is a fear. However, if a rib 22 for suppressing grain unevenness larger than the reinforcing protrusion is provided on the outer edge of the region corresponding to the textured portion 21 in the non-design surface 10b, the deformation of the resin can be concentrated in the vicinity of the rib 22. it can. Thereby, even if sink marks or grain unevenness caused by the reinforcing protrusions occur, deterioration of the appearance of the extension 10 can be suppressed. Instead of the reinforcing protrusion, a fixing protrusion or a positioning protrusion may be provided inside the region corresponding to the embossed portion 21 of the non-design surface 10b.

  In addition, the protrusion length 1 (refer FIG. 5) of the rib 22 from the non-design surface 10b will not be specifically limited if the contraction force of resin can be received. For example, when the rib 22 is given a function as a reinforcing application, a fixing application, or a positioning application, the protruding length l can be determined according to these applications.

  In the third modification, the example in which the rib 22 is provided in the non-design surface 10b in the region corresponding to the bend b17b that is not noticeable even when the graininess is generated is described. However, the present invention is not limited to this. For example, when the uniform embossed portion 21 is formed across the stepped portion, the rib 22 may be provided in a region corresponding to the stepped portion in the non-design surface 10b. This is because the stepped portion is not conspicuous even if the grain is uneven. As described above, the ribs 22 may be provided on the non-design surface 10b side in a region that does not stand out even when uneven graining occurs.

  In the above description, the present invention is applied to a vehicle headlamp. However, the present invention may be applied to a vehicle marker lamp or a vehicle interior lamp.

  Further, the vehicular lamp according to the present embodiment can be applied to a four-wheel vehicle, and can also be applied to a three-wheel or two-wheel vehicle.

1: lamp body, 2: outer cover, 3: high beam lamp unit, 3a: projection lens, 4: low beam lamp unit, 4a: projection lens, 4b: LED, 4c: reflector, 5: turn signal lamp, 10: extension, 10a: Design surface, 10b: Non-design surface, 11: Bottom surface portion, 12: Inclined portion, 13: First cylindrical portion, 14: Second cylindrical portion, 20: Mirror surface portion, 21: Wrinkle portion, 22: Rib, 21a : First wrinkle part, 21b: second wrinkle part, 30: mold, 31: wrinkle transfer part, 31a: convex part, 40: upper mold, 41: wrinkle transfer part, 50: lower mold, 51: rib Forming recess, 53: side wall

Claims (6)

A vehicular lamp provided with resin parts arranged around a light source,
The resin component has a design surface exposed to the front of the lamp, and a non-design surface provided on the back surface of the design surface,
The design surface is provided with a textured portion made of minute irregularities,
The non-designed surface is provided with an uneven unevenness suppressing protrusion that is supported by a mold during mold forming and suppresses surface shrinkage of the textured part in the vicinity of the outer edge of the region corresponding to the textured part. Vehicle lamp.   2. The vehicular lamp according to claim 1, wherein at least a pair of the grain unevenness suppressing protrusions are provided at positions facing each other across a region corresponding to the grain part of the non-design surface. A plurality of the embossed portions are formed on the design surface,
3. The vehicular lamp according to claim 1, wherein, in the non-design surface, the grain unevenness suppressing protrusion is provided at a boundary of a region corresponding to each grain part.   4. The thickness according to claim 1, wherein a thickness of the grain unevenness suppressing protrusion is not less than 0.2 mm and not more than a thickness of the resin part in the part where the grain is formed. 5. Vehicle lamp. An additional protrusion is provided inside the region corresponding to the embossed portion of the non-design surface,
5. The vehicular lamp according to claim 1, wherein the additional protruding portion is smaller than the wrinkle unevenness suppressing protruding portion. A method for manufacturing a resin component for a vehicular lamp, comprising a design surface provided with a textured portion and a non-design surface on the back of the design surface,
A design surface side mold having a micro uneven surface and a non-design surface side mold having a recess on the molding surface side forming a cavity for forming the resin part between the design surface side mold are prepared. Mold preparation process,
A mold arrangement step of arranging the design surface side mold and the non-design surface side mold so as to form the cavity between the design surface side mold and the non-design surface side mold;
A textured part forming step of pouring a raw material resin into the cavity to transfer the textured part by transferring the micro uneven surface;
A cooling step of cooling the raw resin to cure the resin component,
In the cooling step, the non-design surface-side mold is brought into contact with a wrinkle unevenness-suppressing protrusion formed by the concave portion to suppress shrinkage of the wrinkle portion due to cooling of the resin component. Of resin parts for lighting fixtures.

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