JP6686798B2 - Exterior decoration member for vehicle and manufacturing method thereof - Google Patents

Description

  The present invention relates to a decorative member applied to an exterior body such as a vehicle body, and a manufacturing method thereof.

  2. Description of the Related Art Various types of exterior decoration members for vehicles, such as front grills and back garnishes, have been conventionally known. Some of these vehicle exterior decoration members are those in which a transparent resin base material and a design body are integrated, and a concavo-convex portion is provided on the back surface of the transparent resin base material so that the design body is exposed.

  For example, the exterior decoration member described in Patent Document 1 is composed of a housing whose surface serves as a design portion and a transparent resin base material which is assembled to the front of the housing in the vehicle. Then, on the back surface of the transparent resin base material facing the front surface of the housing, a protrusion protruding toward the housing is provided. Light incident on the transparent resin substrate is refracted by the protrusion provided on the back surface of the transparent resin substrate, so that a shadow of the protrusion shape is created on the housing surface. In this manner, the exterior decoration member of Patent Document 1 improves the design of the vehicle exterior body by giving the viewer a certain gradation-like appearance.

  However, the exterior decoration member described in Patent Document 1 has not been able to give a sufficient gradation feeling to an observer.

JP, 2013-112179, A

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an exterior decoration member for a vehicle, which is capable of sufficiently giving a feeling of gradation to an observer, and which has improved designability, and a manufacturing method thereof. Is to provide.

  In the vehicle exterior decoration member of the present invention for solving the above problems, a base material made of a colored translucent body having a surface facing the vehicle exterior and a back surface made of an uneven surface facing the surface, and a base material A vehicle exterior decoration member comprising a light non-transmissive layer formed on a back surface side, wherein the base material has a constant general portion having a thickness of 2.5 mm or more and 4.0 mm or less, and the thickness gradually changes. The gradual-change part has a maximum deviation part that maximizes the difference in thickness from the general part, and includes at least one of the following (A) and (B): Is characterized by.

(A) The difference between the visible light transmittance in the maximum deviation portion and the visible light transmittance in the general portion is 5% or more. (B) When the L value of the Lab color system specified in JIS Z 8729 is assumed, The difference between the L value in the maximum deviation part and the L value in the general part must be 2 or more.

  In the vehicle exterior decoration member of the present invention having the above-described configuration, the base material made of a colored translucent body has a general portion having a constant thickness and a gradually changing portion having a gradually changing thickness. Further, the back surface of the base material is an uneven surface, and a light non-transmissive layer is formed on the back surface side of the base material. The gradual change part of the base material has a maximum deviation part that maximizes the difference from the thickness of the general part, and the relationship between the maximum deviation part and the general part is (A) visible light transmittance in the maximum deviation part. And the visible light transmittance in the general part is 5% or more, and (B) assuming the L value of the Lab color system specified in JIS Z 8729, the L value in the maximum deviation part and the general value At least one of the conditions that the difference from the L value in the part is 2 or more is satisfied.

  With the vehicle exterior decoration member of the present invention including the gradually changing portion that satisfies such conditions, a sufficient gradation feeling can be given to the observer as compared with the conventional exterior decoration member. Therefore, the vehicle exterior decoration member of the present invention is advantageous in improving the design of the entire vehicle.

The figure which represents typically the vehicle to which the vehicle exterior decoration member which concerns on this invention was applied. The front view which represented typically the vehicle exterior decoration member which concerns on 1st Embodiment and 2nd Embodiment. The III-III sectional view in FIG. 2 of the vehicle exterior decoration member which concerns on 1st Embodiment. Of the cross-sectional views shown in FIG. 3, a cross-sectional view showing the base material in the first embodiment. FIG. 3 is a partial cross-sectional view schematically showing a molding die used in the method for manufacturing a vehicle exterior decoration member according to the first embodiment. The III-III sectional view in FIG. 2 of the vehicle exterior decoration member which concerns on 2nd Embodiment. Of the cross-sectional views shown in FIG. 6, a cross-sectional view showing the base material in the second embodiment. The front view which represented typically the vehicle exterior decoration member which concerns on 3rd-5th embodiment. The front view which represented typically the other form of the vehicle exterior decoration member which concerns on 3rd-5th embodiment. The XX sectional view in Drawing 8 and Drawing 9 of the exterior decoration member for vehicles concerning a 3rd embodiment. The XX sectional view in Drawing 8 and Drawing 9 of the exterior decoration member for vehicles concerning a 4th embodiment. The XX sectional view in Drawing 8 and Drawing 9 of the exterior decoration member for vehicles concerning a 5th embodiment.

  Hereinafter, preferred embodiments of the vehicle exterior decoration member of the present invention will be described with reference to FIGS. 1 to 12. 1 to 4 and 6 to 12, right, left, upper, lower, front, and rear show directions as seen by a vehicle occupant in the traveling direction of the vehicle. The directions used in this specification all mean this direction. Further, the “plate thickness direction” in the specification means the front-back direction shown in the drawing. And "plate thickness" means the thickness of the base material in the front-back direction.

  The drawings used for the description are schematic diagrams, and the shape, relative positional relationship, size relationship, and the like in a fine portion are not necessarily strictly described. In addition, for the purpose of making the description easy to understand in the following description, the same member or a member that exhibits a similar effect may be denoted by the same reference numeral or a related reference numeral between different embodiments, but it is It is not intended to unnecessarily limit the relationship between the two.

  Further, matters other than the matters particularly referred to in the present specification and necessary for carrying out the present invention can be grasped as design matters for those skilled in the art based on the conventional technology in the field. The present invention can be carried out based on the contents disclosed in this specification and the common general technical knowledge in the field.

(First embodiment)
The vehicle exterior decoration member 1 according to the first embodiment is a front grill that covers at least a part of the air guide opening provided in the front body of the vehicle 10 as shown in FIGS. 1 and 2. The vehicle exterior decoration member 1 in the embodiment is preferably 500 mm or more in length in the vehicle left-right direction, which is the longitudinal direction, and can be applied as a large shape of about 1500 mm. Further, in the vehicle exterior decoration member 1 of the embodiment, the emblem 11 is arranged at the center in the left-right direction and at the upper part in the up-down direction.

  As shown in FIG. 3, the vehicle exterior decoration member 1 has a base material 2 made of a colored translucent body, and a light non-transmissive layer 3 formed on the back surface 22 side of the base material 2.

  The light non-transmissive layer 3 is a member that reflects the light transmitted through the base material 2 made of a colored semitransparent material or absorbs the transmitted light. As shown in FIG. 3, the light non-transmissive layer 3 is integrally formed on the back surface 22 of the base material 2. The light non-transmissive layer 3 in the embodiment is made of a metal material, but the material of the light non-transmissive layer 3 is not particularly limited and may be, for example, a resin material. The light non-transmissive layer 3 can be formed on the back surface 22 of the substrate 2 by means such as vapor deposition, sputtering, plating, painting, or attachment with an adhesive. The layer thickness of the light non-transmissive layer 3 is preferably constant, and the layer thickness of the light non-transmissive layer 3 is preferably 0.001 mm to 0.5 mm, more preferably 0. It is 01 mm to 0.1 mm.

  The base material 2 made of a colored translucent material is a resin member, and is, for example, a synthetic polymer such as a methyl methacrylate (co) polymer, a polycarbonate, a styrene (co) polymer, a methyl methacrylate-styrene copolymer, or a cellulose diester. Semi-synthetic polymers such as acetate, cellulose triacetate, cellulose acetate butyrate, polyester such as polyethylene terephthalate, polylactic acid, polyamide, polyimide, polyether sulfone, polysulfone, polyethylene, polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetal , Polyetherketone, polyurethane, composites of these polymers (composite of polymethylmethacrylate and polylactic acid, composite of polymethylmethacrylate and polyvinyl chloride, etc.), glass and the like.

  The base material 2 in the embodiment is a black translucent member. However, the color is not particularly limited, and the base material 2 may be a colored translucent member.

  The base material 2 extends in the vehicle lateral direction, which is the vehicle width direction, and has a thin plate shape that is curved so as to slightly bulge toward the front of the vehicle. The base material 2 has a front surface 21 on the vehicle front side facing the outside of the vehicle and a rear surface 22 on the vehicle rear side facing the front surface 21. The surface 21 in the embodiment is a flat surface that is curved so as to slightly bulge toward the front of the vehicle. The base material 2 may be a flat thin plate shape without being curved, and the surface 21 may be a flat surface without being curved.

  The back surface 22 in the embodiment is an uneven surface formed by alternately arranging a plurality of general portions 23 and gradual changing portions 24, which will be described later. Specifically, the back surface 22 forming the gradually changing portion 24 is provided with a convex portion protruding from the back surface 22 when viewed from the back surface 22 side. In other words, the back surface 22 that constitutes the gradual-change portion 24 is provided with a convex portion that projects more toward the light non-transmissive layer 3 side than the back surface 22 that constitutes the general portion 23.

  As shown in FIG. 4, the base material 2 has a general portion 23 having a constant plate thickness and a gradually changing portion 24 having a gradually changing plate thickness. The plate thickness 23h of the general portion 23 is 2.5 mm or more and 4.0 mm or less, which is advantageous for improving moldability such as fluidity and crackability of the resin. More preferably, it is 2.7 mm or more and 3.5 mm or less. The plate thickness 23h of the general portion 23 in this embodiment is 3.0 mm.

  The plate thickness of the gradually changing portion 24 in the embodiment is changed so as to be gradually larger than the plate thickness 23h of the general portion 23. In other words, the gradual change portion 24 is configured so that the plate thickness gradually changes and protrudes toward the vehicle rear side from the general portion 23.

  As shown in FIG. 4, the gradual change section 24 in the present embodiment includes a first gradual change section 24a and a second gradual change section 24b that are continuous with each other. The first gradually changing portion 24a is formed so as to have a longer length in the gradually changing direction than the second gradually changing portion 24b. Here, the “gradual change direction” indicates the direction in which the plate thickness gradually changes, that is, the left-right direction in the drawing.

  The first gradually changing portion 24a gradually changes so as to incline toward the vehicle rear side from the vehicle left direction to the right direction. The second gradually changing portion 24b gradually changes so as to incline toward the vehicle front side from the vehicle left direction to the right direction. That is, the first gradually changing portion 24a and the second gradually changing portion 24b are provided so that the gradually changing directions are opposite. Then, at the boundary between the first gradually changing portion 24a and the second gradually changing portion 24b, the maximum deviation portion 25 in which the plate thickness of the gradually changing portion 24 is the largest is formed.

  As shown in FIG. 4, the general portion 23 and the gradually changing portion 24 in this embodiment are continuous. The first gradual change portion 24a and the general portion 23 are continuous at the first boundary portion 23a, and the second gradual change portion 24b and the general portion 23 are continuous at the second boundary portion 23b.

  The length in the gradually changing direction of the first gradually changing portion 24a from the first boundary portion 23a to the maximum deviation portion 25 is preferably 10 mm or more. More preferably, it is 50 mm or more.

  The base material 2 in the embodiment has a translucent black color. Therefore, the first gradual change portion 24 a in which the plate thickness of the base material 2 gradually increases from the first boundary portion 23 a toward the maximum deviation portion 25 causes the observer to have a darker black color as it goes toward the maximum deviation portion 25. Can be seen. That is, a gradation feeling is produced. Therefore, in the vehicle exterior decorative member 1 of the embodiment, the longer the length of the first gradually changing portion 24a in the gradually changing direction is, the more the gradation feeling is produced over a wider range, which is advantageous in improving the design. .

  Further, the length of the second gradual change portion 24b from the second boundary portion 23b to the maximum deviation portion 25 in the gradual change direction is shorter than the length of the first gradual change portion 24a in the gradual change direction and less than 5 mm. desirable. More preferably, it is less than 3 mm.

  The length in the gradually changing direction of the second gradually changing portion 24b affects the appearance of the color produced by the maximum deviation portion 25. As the length of the second gradually changing portion 24b in the gradually changing direction becomes shorter, the distance between the maximum deviation portion 25 and the second boundary portion 23b in the left-right direction becomes smaller. In other words, the distance between the maximum deviation portion 25 visually perceived by the observer as the darkest and the general portion 23 visually perceived as the thinnest in the left-right direction becomes small. Therefore, in the vehicle exterior decoration member 1 according to the embodiment, it is possible for the observer to clearly see the light and shade at one end of the gradation region rendered by the gradually changing portion 24.

  On the other hand, as the length of the second gradually changing portion 24b in the gradually changing direction becomes longer, the distance between the maximum deviation portion 25 and the second boundary portion 23b in the left-right direction becomes larger. That is, the distance in the left-right direction between the maximum deviation portion 25 visually perceived by the observer as the darkest and the general portion 23 visually perceived as the thinnest becomes large. Therefore, in the vehicle exterior decoration member 1 in the embodiment, the shade of the maximum deviation portion 25 in the gradation region rendered by the gradually changing portion 24 can be blurred and made visible to the observer.

  In addition, the longer the length of the second gradually changing portion 24b in the gradually changing direction, the more excellent the formability of the vehicle exterior decorative member 1 of the embodiment. This is because as the length of the second gradually changing portion 24b in the gradually changing direction becomes longer, the second gradually changing portion 24b has a gentle slope. That is, when the vehicle exterior decorative member 1 of the embodiment is formed, the inside of the cavity forming the second gradually changing portion 24b becomes gentle. Therefore, the fluidity of the fluid member (molten resin) that moves in the molding die is improved, so that the vehicle exterior decoration member 1 of the embodiment is advantageous for improving the moldability.

  As described above, the vehicle exterior decoration member 1 according to the embodiment provides the viewer with a sense of gradation because the base material 2 made of a colored translucent body has the general portion 23 and the gradually changing portion 24. Is. The gradation feeling given to the observer is produced by the change of the visible light transmittance in the plate thickness direction of the gradually changing portion 24. That is, in the first gradual change part 24a of the gradual change part 24, in the gradual change section from the first boundary part 23a of the general part 23 to the maximum deviation part 25, the visible light is emitted from the first boundary part 23a toward the maximum deviation part 25. A gradation feeling is produced by gradually decreasing the transmittance. That is, the visible light transmittance of the general portion 23 is the largest, and the visible light transmittance of the maximum deviation portion 25 is the smallest. At this time, it is sufficient that the difference between the visible light transmittance in the plate thickness direction in the general portion 23 and the visible light transmittance in the plate thickness direction in the maximum deviation portion 25 of the gradually changing portion 24 is 5% or more. A gradation effect is produced.

  If the visible light transmittance of the general part 23 and the gradual change part 24 is too large, the transparency becomes high, and it becomes difficult to express a gradation feeling. Further, if the visible light transmittances of the general portion 23 and the gradually changing portion 24 are too small, the transparency becomes low, and it becomes difficult to express a gradation feeling. Therefore, the visible light transmittance in the plate thickness direction in the general portion 23 in the embodiment is preferably 25% or more and 40% or less. The visible light transmittance in the plate thickness direction at the maximum deviation portion 25 is preferably 10% or more and 25% or less. The gradual change portion 24 is configured so that the visible light transmittance is within the above range, and the visible light transmittance difference between the general portion 23 and the maximum deviation portion 25 is 5% or more. desirable. By configuring the base material 2 in this manner, the vehicle exterior decoration member 1 in the embodiment can give the observer a feeling of gradation with higher design.

  Further, the gradation feeling given to the observer is produced by the change of the L value in the gradually changing portion 24. Here, the L value is a value specified by the Lab color system specified in JIS Z 8729. In the first gradual change part 24a of the gradual change part 24, in the gradual change section from the first boundary part 23a of the general part 23 to the maximum deviation part 25, the L value gradually increases from the first boundary part 23a toward the maximum deviation part 25. A feeling of gradation is produced by becoming smaller. That is, the L value of the general part 23 is the largest, and the L value of the maximum deviation part 25 is the smallest. At this time, when the difference between the L value of the general portion 23 and the L value of the maximum deviation portion 25 of the gradual change portion 24 is 2 or more, a sufficient gradation feeling is produced.

  If the L value of the general portion 23 and the gradual change portion 24 is too large, the brightness becomes too bright, and it becomes difficult to produce a gradation feeling. Further, if the L value of the general portion 23 and the gradual change portion 24 is too small, it becomes too dark, and it becomes difficult to express a gradation feeling. Therefore, the L value of the general portion 23 in the embodiment is preferably 20.0 or more and 26.0 or less. Further, the L value of the maximum deviation part 25 is preferably 18.0 or more and 24.0 or less. Then, it is preferable that the first gradual change portion 24a is configured so that the L value is within the above range, and that the difference between the L values in the general portion 23 and the maximum deviation portion 25 is 2 or more. By configuring the base material 2 in this manner, the vehicle exterior decoration member 1 in the embodiment can sufficiently provide the observer with a gradation feeling with a higher design.

  The difference between the plate thickness of the maximum deviation portion 25 of the gradually changing portion 24 and the plate thickness of the general portion 23 (maximum plate thickness difference 25h) is preferably 0.3 mm or more and 1.5 mm or less. More preferably, it is 0.5 mm or more and 0.9 mm or less.

  When the vehicle exterior decoration member 1 in the embodiment has a large size in the vehicle width direction of, for example, 500 mm or more, a sink mark is generated on the surface 21 of the base material 2 when the vehicle exterior decoration member 1 is manufactured. There is a risk. This may occur because the shrinkage amount of the resin in the general portion 23 and the gradual variation portion 24 is different by providing the back surface 22 of the base material 2 with the gradual variation portion 24 having a plate thickness larger than that of the general portion 23. Is.

  Therefore, in the base material 2 in the embodiment, as described above, the difference (maximum thickness difference) 25h between the thickness of the maximum deviation portion 25 of the gradual change portion 24 and the thickness of the general portion 23 is 0.3 mm or more. It is preferably 0.5 mm or less. More preferably, it is 0.5 mm or more and 0.9 mm or less. By thus configuring the maximum plate thickness difference 25h, it is possible to effectively suppress the occurrence of sink marks. Further, by configuring the gradual change portion 24 so as to provide such a maximum plate thickness difference 25h, it is possible to more sufficiently produce the gradation feeling in the gradual change portion 24.

  Next, a method for manufacturing the vehicle exterior decoration member 1 in the embodiment will be described. The manufacturing method is characterized by an injection molding process in which a molten resin, which is a fluid material, is injection-molded in the molding die 4. For other steps, for example, a known method for manufacturing a vehicle exterior decoration member can be adopted. Therefore, the injection molding step of the method for manufacturing the vehicle exterior decorative member 1 according to the embodiment will be described below.

  FIG. 5 schematically shows a partial cross section of the molding die 4 used in the method for manufacturing the vehicle exterior decorative member 1 in the embodiment. As shown in FIG. 5, the molding die 4 has a first cavity 41 for molding the general portion 23 and a second cavity 42 for molding the gradually changing portion 24.

  The first cavity 41 has a first end portion 41 a that becomes the first boundary portion 23 a of the general portion 23 and a second end portion 41 b that becomes the second boundary portion 23 b of the general portion 23 after molding. The first end portion 41a and the second end portion 41b serve as a boundary between the first cavity 41 and the second cavity 42.

  The second cavity 42 is formed with a first gradual change forming part 42a for forming the first gradual change part 24a after forming, a second gradual change forming part 42b for forming the second gradual change part 24b, and a maximum deviation part 25. The maximum deviation shaping unit 42c is provided.

  In the molding die 4 used in the injection molding process in the embodiment, the plurality of first cavities 41 and the second cavities 42 are arranged alternately and continuously. That is, the first end portion 41 a of the first cavity 41 and the first gradual change molding portion 42 a of the second cavity 42 are continuous. Further, the second end portion 41b of the first cavity 41 and the second gradual change molding portion 42b of the second cavity 42 are continuous.

  The size of the first gradually changing molding portion 42a in the flow direction of the fluid material shown in FIG. 5 is configured to be larger than the size of the second gradually changing molding portion 42b.

  As shown in FIG. 5, the first gradual change forming portion 42a of the second cavity 42 has a flow passage cross-sectional area that gradually increases from the first end portion 41a of the first cavity 41 toward the maximum deviation forming portion 42c. Is configured. The second gradual change molding portion 42b of the second cavity 42 is configured such that the flow passage cross-sectional area gradually decreases from the maximum deviation molding portion 42c toward the second end portion 41b of the first cavity 41. .

  In other words, the first gradual change forming portion 42a has an inclined surface x that gradually inclines downward in the direction of gravity from the first end portion 41a of the first cavity 41 toward the maximum deviation forming portion 42c. On the other hand, the second gradual change forming part 42b has an inclined surface y that gradually inclines upward in the direction of gravity from the maximum deviation forming part 42c toward the second end 41b of the first cavity 41. Further, as described above, the size of the first gradual change molding portion 42a is configured to be larger than the size of the second gradual change molding portion 42b. Therefore, the inclined surface x is a gentler surface than the inclined surface y.

  In the injection molding process in the embodiment, the molten resin is molded so that the molten resin, which is a fluid material, flows from the first end portion 41a of the first cavity 41 toward the maximum deviation molding portion 42c of the second cavity 42. It is injected into the mold 4. The injection start gate for injecting the molten resin into the molding die 4 is preferably provided at the center of the molding die 4 in the vehicle width direction.

  When the molten resin is injected into the molding die 4 in this way, the molten resin flows through the molding die 4 as follows. That is, in the first cavity 41, the molten resin flows from the second end 41b toward the first end 41a. In the second cavity 42, the molten resin flows from the first gradual change molding part 42a toward the second gradual change molding part 42b. That is, the molten resin flows in the second cavity 42 in the direction in which the flow passage cross-sectional area increases.

  According to the method for manufacturing the vehicle exterior decorative member 1 in the embodiment including the injection molding process described above, the molten resin in the second cavity 42 changes from the first gradually changing molding portion 42a to the second gradually changing molding portion 42b. Flow toward. The first gradually changing molding portion 42a has an inclined surface x, and the second gradually changing molding portion 42b has an inclined surface y. Since the inclined surface x is a gentler surface than the inclined surface y, the molten resin can be sufficiently filled in the maximum deviation molding portion 42c by the molten resin flowing from the inclined surface x toward the inclined surface y. Therefore, the method of manufacturing the vehicle exterior decorative member 1 according to the embodiment is advantageous for improving moldability.

(Second embodiment)
The vehicle exterior decoration member 1 according to the second embodiment is configured such that the plate thickness of the gradually changing portion 64 of the base material 6 is smaller than the plate thickness of the general portion 63. The vehicle exterior decoration member 1 of the second embodiment and the vehicle exterior decoration member 1 of the first embodiment differ in this configuration, and are similar in other configurations. Therefore, the configuration different from that of the first embodiment will be described below.

  As shown in FIG. 6, the vehicle exterior decoration member 1 according to the embodiment includes a base material 6 made of a colored semitransparent material and a light non-transmissive layer 3 formed on the back surface 62 side of the base material 6. . The light non-transmissive layer 3 is integrally formed on the back surface 62 of the base material 6.

  As shown in FIG. 7, the base material 6 has a general portion 63 having a constant plate thickness 63h and a gradually changing portion 64 having a gradually changing plate thickness. The plate thickness of the gradually changing portion 64 in the embodiment is changed so as to be gradually smaller than the plate thickness 63h of the general portion 63. In other words, the gradually changing portion 64 is configured so that the plate thickness gradually changes and is recessed toward the vehicle front side (toward the surface 61) with respect to the general portion 63.

  As shown in FIG. 7, the first gradual change portion 64a in the present embodiment is gradually changed so as to incline toward the vehicle front side from the vehicle left direction to the right direction. The second gradually changing portion 64b is gradually changed so as to incline toward the vehicle rear side from the vehicle left direction to the right direction. Then, at the boundary between the first gradually changing portion 64a and the second gradually changing portion 64b, the maximum deviation portion 65 where the plate thickness of the gradually changing portion 64 is the smallest is formed. Therefore, the first gradual change portion 64a in which the plate thickness of the base material 6 gradually decreases from the first boundary portion 63a toward the maximum deviation portion 65 causes the observer to become blacker toward the maximum deviation portion 65. Can be seen. That is, a gradation feeling is produced. In the embodiment, the difference between the plate thickness at the maximum deviation portion 65 of the gradually changing portion 64 and the plate thickness at the general portion 63 is shown in FIG. 7 as a maximum plate thickness difference 65h.

  The vehicle exterior decoration member 1 in the embodiment is a gradual change section from the first boundary part 63a of the general part 63 to the maximum deviation part 65 in the first gradual change part 64a of the gradual change part 64, and the first boundary part. The visible light transmittance gradually increases from 63a toward the maximum deviation portion 65, so that a gradation feeling is produced. That is, the visible light transmittance of the general portion 63 is the smallest, and the visible light transmittance of the maximum deviation portion 65 is the largest. At this time, since the difference between the visible light transmittance in the plate thickness direction in the general portion 63 and the visible light transmittance in the plate thickness direction in the maximum deviation portion 65 of the gradual change portion 64 is 5% or more, For the same reason as in the embodiment, a sufficient gradation feeling is produced.

  Further, the gradation feeling given to the observer is produced by the change of the L value in the gradually changing portion 64. In the first gradual change portion 64a of the gradual change portion 64, in the gradual change section from the first boundary portion 63a of the general portion 63 to the maximum deviation portion 65, the L value gradually increases from the first boundary portion 63a toward the maximum deviation portion 65. By increasing the size, a gradation feeling is produced. That is, the L value of the general part 63 is the smallest, and the L value of the maximum deviation part 65 is the largest. At this time, since the difference between the L value of the general portion 63 and the L value of the maximum deviation portion 65 of the gradually changing portion 64 is 2 or more, a sufficient gradation feeling is produced for the same reason as in the first embodiment. .

(Third Embodiment)
The vehicle exterior decoration member 1 of the third embodiment differs from the vehicle exterior decoration member 1 of the first embodiment in the shape of the gradually changing portion. That is, in the gradually changing portion 24 of the vehicle exterior decoration member 1 of the first embodiment, the front surface 21 is a flat surface and the back surface 22 is an uneven surface, whereas the vehicle exterior decoration member of the third embodiment is. In the gradually changing portion 74 of the member 1, both the front surface 71 and the back surface 72 are uneven surfaces. The vehicle exterior decoration member 1 of the third embodiment and the vehicle exterior decoration member 1 of the first embodiment differ in this configuration, and the other configurations are the same. Therefore, the configuration different from that of the first embodiment will be described below.

  In the vehicle exterior decoration member 1 of the embodiment, the base material 7 can be provided with the stripe-shaped gradually changing portions 74 and the lattice-like gradually changing portions 74 as shown in FIGS. 8 and 9.

  As shown in FIG. 10, the front surface 71 forming the gradually changing portion 74 is formed with a recessed portion that is recessed toward the back surface 72 side of the front surface 71 forming the general portion 73 when viewed from the front surface 71 side. . In other words, the front surface 71 forming the gradually changing portion 74 has an isosceles triangular cross section with the apex located on the back surface 72 side. Further, on the back surface 72 that constitutes the gradually changing portion 74, when viewed from the back surface 72 side, a convex portion that protrudes toward the light non-transmissive layer 3 side from the back surface 72 that constitutes the general portion 73 is formed. In other words, the back surface 72 forming the gradually changing portion 74 has an isosceles triangular cross section whose apex is located on the light non-transmissive layer 3 side.

  As shown in FIG. 10, the gradual change portion 74 in the present embodiment includes a first gradual change portion 74a and a second gradual change portion 74b that are continuous with each other. The lengths of the first gradually changing portion 74a and the second gradually changing portion 74b in the gradually changing direction are both the same. The apex angle of the front surface 71 of the isosceles triangular section in the gradual change portion 74 is located rearward of the bottom side, and similarly, the apex angle of the back surface 72 of the isosceles triangular shape in the gradual change section 74 is the bottom side. It is located on the rear side of. In addition, the apex of the front surface 71 and the apex of the back surface 72 are formed so as to be located on a straight line parallel to the front-rear direction. That is, the front surface 71 of the gradually changing portion 74 is formed so as to follow the shape of the back surface 72 of the gradually changing portion 74.

  The first gradual change portion 74a is gradually changed so as to incline toward the vehicle rear side from the vehicle left direction to the right direction and to increase the plate thickness. The second gradually changing portion 74b gradually changes so as to incline toward the vehicle front side from the vehicle left direction to the right direction and to reduce the plate thickness. That is, as shown in FIG. 10, the first gradually changing portion 74a and the second gradually changing portion 74b are formed so that the gradually changing directions are opposite to each other. Then, the maximum deviation portion 75 that maximizes the plate thickness of the gradual change portion 74 is formed at the boundary between the first gradual change portion 74a and the second gradual change portion 74b. The first gradual change portion 74a and the second gradual change portion 74b formed in this way are symmetrical with respect to the maximum deviation portion.

  The first gradual change portion 74a in the embodiment has a first gradual change surface 741a that is a part of the front surface 71 and a first gradual change back surface 742a that is a part of the back surface 72. Further, the second gradual change portion 74 b has a second gradual change surface 741 b which is a part of the front surface 71 and a second gradual change back surface 742 b which is a part of the back surface 72.

  The first gradually changing surface 741a is inclined rearward of the vehicle from the surface 71 forming the general portion 73 to the maximum deviation portion 75. The first gradually changing rear surface 742a, which is a part of the rear surface 72, is also inclined rearward of the vehicle from the rear surface 72 forming the general portion 73 to the maximum deviation portion 75. The first gradual change surface 741a is a gentler slope than the first gradual change back surface 742a. The plate thickness of the first gradually changing portion 74a is formed so as to gradually increase from the general portion 73 continuous with the first gradually changing portion 74a to the maximum deviation portion 75. The second gradually changing portion 74b has the same shape as the first gradually changing portion 74a as described above.

  In the vehicle exterior decorative member 1 in the embodiment, the plate thickness gradually increases in the gradual change section from the boundary with the general section 73 to the maximum deviation section 75 in the first gradual change section 74a, that is, the maximum deviation section 75. As the visible light transmittance gradually decreases toward, a gradation feeling is produced. Similarly, in the second gradually changing portion 74b as well, the visible light transmittance gradually decreases from the boundary with the general portion 73 toward the maximum deviation portion 75, and a gradation feeling is produced. That is, the visible light transmittance in the general portion 73 becomes the largest, and the visible light transmittance in the maximum deviation portion 75 becomes the smallest. At this time, since the difference between the visible light transmittance in the general portion 73 and the visible light transmittance in the maximum deviation portion 75 is 5% or more, a sufficient gradation feeling is produced for the same reason as in the first embodiment. It

  Further, the gradation feeling given to the observer is produced by the change of the L value in the gradually changing portion 74. From the boundary between the general portion 73 of each of the first gradual change portion 74a and the second gradual change portion 74b, the L value gradually decreases toward the maximum deviation portion 75, so that a gradation feeling is produced. That is, the L value in the general portion 73 is the largest, and the L value in the maximum deviation portion 75 is the smallest. At this time, since the difference between the L value in the general portion 73 and the L value in the maximum deviation portion 75 is 2 or more, a sufficient gradation feeling is produced for the same reason as in the first embodiment.

  In addition, in the gradual change portion 74 in the embodiment, the first gradual change portion and the second gradual change portion have a bilaterally symmetrical shape. Therefore, it is possible to produce a similar gradation feeling when the observer views the vehicle exterior decoration member 1 of the embodiment from either the left or right direction. Therefore, it is advantageous to further improve the design.

  Further, in the gradual change portion 74 in the present embodiment, unlike the flat surface 21 of the gradual change portion 24 in the first embodiment, the surface 71 composed of the inclined surfaces of the first gradual change surface 741a and the second gradual change surface 741b is provided. Have. Therefore, in the respective embodiments, the reflection and the refraction of the light reaching the surface of the gradually changing portion are different from each other. As a result, the gradation feeling produced by the gradual change section 74 in the embodiment and the gradual change section 24 in the first embodiment are different from each other. In particular, in the case of the gradual change portion 74 in the embodiment, by having the first gradual change surface 741a and the second gradual change surface 741b that are inclined surfaces, it is possible to obtain a wider variety of gradation and three-dimensional feeling as compared with the first embodiment. A feeling can be produced. Therefore, it is advantageous to further improve the design.

  Further, in the gradually changing portion 74 in the embodiment, as shown in FIG. 10, the concave portion of the front surface 71 is formed at a position corresponding to the convex portion formed on the rear surface 72. In other words, the vertices (apex angles) of the isosceles triangles in cross section of the front surface 71 and the back surface 72 are formed so as to face the same direction. Accordingly, it is possible to prevent the plate thickness of the gradually changing portion 74 from becoming too large due to the convex portion formed on the back surface 72. That is, it is possible to effectively suppress sink marks due to the plate thickness becoming too large. Therefore, the vehicle exterior decoration member 1 of the embodiment is advantageous for improving moldability.

(Fourth Embodiment)
In the vehicle exterior decoration member 1 of the fourth embodiment, both the front surface 81 and the back surface 82 of the base material 8 are uneven surfaces, as in the vehicle exterior decoration member 1 of the third embodiment. However, the fourth embodiment is different from the third embodiment in the shape of the back surface 82 of the base material 8 in the gradually changing portion 84. That is, in the back surface 72 that constitutes the gradual change portion 74 in the third embodiment, a convex portion that protrudes from the back surface 72 when viewed from the back surface 72 side is formed, whereas in the gradual change portion 74 in the fourth embodiment, On the back surface 82 that constitutes the deformed portion 84, a recessed portion that is recessed toward the front surface 81 when viewed from the back surface 82 side is formed. The vehicle exterior decoration member 1 of the fourth embodiment and the vehicle exterior decoration member 1 of the third embodiment differ in this configuration, and the other configurations are the same. Therefore, the configuration different from that of the third embodiment will be described below.

  As shown in FIG. 11, the back surface 82 that constitutes the gradually changing portion 84 is provided with a recessed portion that is recessed closer to the front surface 81 than the back surface 82 that constitutes the general portion 83. Specifically, the front surface 81 forming the gradually changing portion 84 has an isosceles triangular cross section with the apex located on the back surface 82 side. Further, the back surface 82 forming the gradually changing portion 84 has an isosceles triangular cross-section with the apex located on the front surface 81 side.

  As shown in FIG. 11, the gradual change section 84 in the present embodiment includes a first gradual change section 84a and a second gradual change section 84b that are continuous with each other. The lengths of the first gradually changing portion 84a and the second gradually changing portion 84b in the gradually changing direction are both the same. Further, the apex angle of the front surface 81 of the isosceles triangular section in the gradual change portion 84 is located rearward of the bottom side, while the apex angle of the back surface 82 of the isosceles triangular section in the gradual change section 84 is greater than the bottom side. It is located on the front side. In addition, the apex of the front surface 81 and the apex of the back surface 82 are formed so as to be located on a straight line parallel to the front-rear direction. In this way, the concave portion of the front surface 81 of the gradually changing portion 84 and the concave portion of the rear surface 82 of the gradually changing portion 74 are formed so that the vertices (apex angles) of the isosceles triangular cross section face each other.

  The first gradually changing portion 84a gradually changes so that the plate thickness decreases from the left side of the vehicle toward the right side. The second gradually changing portion 84b gradually changes so that the plate thickness increases from the left side of the vehicle toward the right side. That is, the first gradual change portion 84a and the second gradual change portion 84b are formed so that the gradual change directions are opposite to each other. Then, a maximum deviation portion 85 having the smallest plate thickness of the gradual change portion 84 is formed at the boundary between the first gradual change portion 84a and the second gradual change portion 84b. The first gradual change portion 84a and the second gradual change portion 84b are symmetrical with respect to the maximum deviation portion 85.

  The first gradually changing portion 84a in the present embodiment has a first gradually changing surface 841a and a first gradually changing back surface 842a. The first gradually changing surface 841a is inclined rearward of the vehicle from the surface 81 forming the general portion 83 to the maximum deviation portion 85. The first gradually changing back surface 842a, which is a part of the back surface 82, is inclined forward of the vehicle from the back surface 82 forming the general portion 83 to the maximum deviation portion 85. The first gradually changing front surface 841a is an inclined surface that is gentler than the first gradually changing back surface 842a. Since the first gradual change surface 841a and the first gradual change back surface 842a have different inclination directions from each other in this way, the plate thickness of the first gradual change portion 84a is the maximum from the general portion 83 continuous with the first gradual change portion 84a. The deviation portion 85 is formed so as to become gradually smaller. The second gradually changing portion 84b has a second gradually changing surface 841b and a second gradually changing back surface 842b. The second gradually changing portion 84b has the same shape as the first gradually changing portion 84a as described above.

  In the vehicle exterior decoration member 1 in the embodiment, the plate thickness gradually decreases in the gradual change section from the boundary with the general section 83 to the maximum deviation section 85 in the first gradual change section 84a, that is, the maximum deviation section 85. As the visible light transmittance gradually increases toward, a gradation feeling is produced. Similarly, also in the second gradual change portion 84b, the visible light transmittance gradually increases from the boundary with the general portion 83 toward the maximum deviation portion 85, and a sense of gradation is produced. That is, the visible light transmittance in the general portion 83 is the smallest, and the visible light transmittance in the maximum deviation portion 85 is the largest. At this time, since the difference between the visible light transmittance in the general portion 83 and the visible light transmittance in the maximum deviation portion 85 is 5% or more, a sufficient gradation feeling is produced for the same reason as in the first embodiment. It

  Further, the gradation feeling given to the observer is produced by the change of the L value in the gradually changing portion 84. From the boundary between the general portion 83 of each of the first gradually changing portion 84a and the second gradually changing portion 84b, the L value gradually increases toward the maximum deviation portion 85, so that a gradation feeling is produced. That is, the L value in the general part 83 is the smallest, and the L value in the maximum deviation part 85 is the largest. At this time, since the difference between the L value in the general portion 83 and the L value in the maximum deviation portion 85 is 2 or more, a sufficient gradation feeling is produced for the same reason as in the first embodiment.

  Moreover, in the gradual change portion 84 in the embodiment, the first gradual change portion 84a and the second gradual change portion 84b have a bilaterally symmetrical shape. Therefore, the same effect as the third embodiment is obtained.

  Further, in the gradual change portion 84 in the present embodiment, unlike the flat surface 61 of the gradual change portion 64 in the second embodiment, the surface 81 composed of the inclined surfaces of the first gradual change surface 841a and the second gradual change surface 841b is provided. Have. Therefore, in each embodiment, the reflection and the refraction of the light reaching the surface of the gradually changing portion are different from each other. Thereby, the gradation feeling produced by the gradual change unit 84 in the embodiment and the gradual change unit 64 in the second embodiment are different from each other. In particular, in the case of the gradual change portion 84 in the present embodiment, by having the first gradual change surface 841a and the second gradual change surface 841b that are inclined surfaces, it is possible to obtain a wider variety of gradation and stereoscopic effect compared to the second embodiment. A feeling can be produced. Therefore, it is advantageous to further improve the design.

(Fifth Embodiment)
In the vehicle exterior decorative member 1 of the fifth embodiment, the front surface 91 forming the gradual changing portion 94 is the back surface of the surface 91 forming the general portion 93, similarly to the gradual changing portion 74 of the third embodiment. A recessed recess is formed on the side of 92, and a back surface 92 forming the gradually changing portion 94 is formed with a projection protruding from the back surface 92 when viewed from the back surface 92 side. However, the gradual change portion 94 in the fifth embodiment has a plurality of gradual change sections, unlike the gradual change portion 74 in the third embodiment. The different configuration will be described below.

  The gradual change part 94 in the embodiment is composed of four gradual change parts, a first gradual change part 94a, a second gradual change part 94b, a third gradual change part 94c, and a fourth gradual change part 94d. As shown in FIG. 12, a third gradually changing portion 94c, a first gradually changing portion 94a, a second gradually changing portion 94b, and a fourth gradually changing portion 94d are sequentially arranged from left to right. The gradually changing directions of the first gradually changing portion 94a and the third gradually changing portion 94c are the same, and the gradually changing directions of the second gradually changing portion 94b and the fourth gradually changing portion 94d are the same. The gradually changing directions of the first gradually changing portion 94a and the third gradually changing portion 94c and the second gradually changing portion 94b and the fourth gradually changing portion 94d are different from each other. Then, a maximum deviation portion 95 that maximizes the plate thickness of the gradual change portion 94 is formed at the boundary between the first gradual change portion 94a and the second gradual change portion 94b, which are the changing portions in the gradual change direction. In the embodiment, the first gradually changing portion 94a and the second gradually changing portion 94b are symmetrical with respect to the maximum deviation portion 95, and the third gradually changing portion 94c and the fourth gradually changing portion 94d. And are symmetrical to each other with the maximum deviation portion 95 as the center.

  The surface 91 that constitutes the gradual change portion 94 is continuous with the surface 91 that constitutes the general portion 93 and is a flat third gradual change surface 941c, and the first gradual change surface 941a that is continuous with the third gradual change surface 941c. A second gradual surface 941b which is continuous with the first gradual surface 941a and has a different inclination direction from the first gradual surface 941a, and a flat surface which is continuous with the second gradual surface 941b and continuous with the surface 91 of the general portion 93. The fourth gradually changing surface 941d. That is, the gradual change portion 94 of the embodiment includes the third gradual change surface 941c, the first gradual change surface 941a, the second gradual change surface 941b, and the fourth gradual change surface 941d in order from the left side to the right side of the vehicle. Are continuous.

  As shown in FIG. 12, the third gradually changing surface 941c is an extension of the surface 91 of the left general portion 93, that is, a flat surface. The first gradually changing surface 941a is inclined rearward from the left side to the right side. The second gradually changing surface 941b is inclined forward from the left side to the right side. That is, the first gradually changing surface 941a and the second gradually changing surface 941b are inclined surfaces having different inclination directions. The fourth gradually changing surface 941d is an extension of the surface 91 of the general portion 93 on the right side, that is, forms a flat surface.

  The back surface 92 that constitutes the gradual change portion 94 includes a third gradual change back surface 942c that is continuous with the back surface 92 of the general portion 93, a first gradual change back surface 942a that is continuous with the third gradual change back surface 942c, and a first gradual change back surface. A second gradual change back surface 942b which is continuous with the first gradual change back surface 942a and has an inclination direction different from that of the first gradual change back surface 942a; and a fourth gradual change back surface 942d which is continuous with the second gradual change back surface 942b and continuous with the back surface 92 of the general portion 93. Consists of. That is, the gradual change portion 94 of the embodiment includes the third gradual change back surface 942c, the first gradual change back surface 942a, the second gradual change back surface 942b, and the fourth gradual change back surface 942d in order from left to right of the vehicle. Are continuous. The first gradually changing back surface 942a and the third gradually changing back surface 942c have the same inclination direction, the second gradually changing back surface 942b and the fourth gradually changing back surface 942d have the same inclination direction, and the first gradually changing back surface 942a. And the inclination direction of the third gradually changing back surface 942c.

  As shown in FIG. 12, both the first gradually changing back surface 942a and the third gradually changing back surface 942c are inclined rearward from the left side to the right side. The third gradually changing back surface 942c is more gently inclined than the first gradually changing back surface 942a. Both the second gradually changing back surface 942b and the fourth gradually changing back surface 942d are inclined forward from the left side to the right side. The fourth gradually changing back surface 942d is slightly inclined more than the second gradually changing back surface 942b.

  The third gradually changing portion 94c of the embodiment has a third gradually changing surface 941c and a third gradually changing back surface 942c, and is formed such that the plate thickness increases from the left side to the right side. The first gradual change portion 94a has a first gradual change surface 941a and a first gradual change back surface 942a, and is formed so that the plate thickness increases from the left side to the right side. The third gradual change portion 94c and the first gradual change portion 94a are formed so that their gradual change ratios are different from each other. Here, the “gradual change ratio” means the amount of change in plate thickness with respect to the length in the gradually changing direction. That is, the thickness change amount of the plate thickness that increases from left to right in the third gradual change portion 94c and the plate thickness thickness that increases from left to right in the first gradual change portion 94a. The amount of change is different from each other. In this embodiment, the gradual change rate of the third gradual change section 94c is smaller than the gradual change rate of the first gradual change section 94a. The relationship of the gradual change rate between the second gradual change section 94b and the fourth gradual change section 94d is the same as the relationship of the gradual change rate between the third gradual change section 94c and the first gradual change section 94a.

  As described above, the third gradually changing portion 94c of the present embodiment has a symmetrical shape with the fourth gradually changing portion 94d and the maximum deviation portion 95 as the center, and the first gradually changing portion 94a and the second gradually changing portion 94b. The shape is symmetrical with respect to the maximum deviation portion 95. Therefore, the gradual change rate of the third gradual change section 94c is the same as the gradual change rate of the fourth gradual change section 94d, and the gradual change rate of the first gradual change section 94a is the same as the gradual change rate of the second gradual change section 94b. Is.

  The vehicle exterior decoration member 1 in the embodiment as described above has the following effects. That is, the third gradually changing portion 94c and the fourth gradually changing portion 94d in the present embodiment have the same shape as the gradually changing portion 24 in the first embodiment. Therefore, the same effect as the vehicle exterior decoration member 1 of 1st Embodiment is produced. Further, the first gradually changing portion 94a and the second gradually changing portion 94b of the embodiment have the same shape as the gradually changing portion 74 of the third embodiment. Therefore, the same effect as the vehicle exterior decoration member 1 of 3rd Embodiment is produced.

  In addition, the vehicle exterior decoration member 1 of the embodiment has a gradual change portion 94 configured by connecting four gradual change portions. Therefore, according to the vehicle exterior decoration member 1 of the embodiment, different gradation feelings can be continuously produced depending on the direction in which the observer views the vehicle exterior decoration member 1 of the embodiment. Therefore, it is advantageous to further improve the design.

  Further, in the gradual change portion 94 in the embodiment, the gradual change rate of the third gradual change section 94c and the gradual change rate of the first gradual change section 94a are different from each other. That is, the vehicle exterior decorative member 1 of the embodiment is configured such that the plate thickness gradually increases from the general portion 93 to the maximum deviation portion 95, and the first gradually changing portion 94a and the second gradually changing portion 94a. Different gradation feeling can be produced with 94b. That is, it is possible to continuously produce two different gradation feelings in the gradually changing portion 94. Therefore, according to the vehicle exterior decoration member 1 of the embodiment, it is advantageous to further improve the designability as compared with the first embodiment and the third embodiment.

  The preferred embodiments of the present invention have been described above in detail with reference to the drawings. However, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the invention. Specifically, the same effects as those of the present invention can be obtained even with the following configuration.

  For example, the vehicle exterior decoration member 1 according to the first embodiment may be provided with a through opening that allows the outside air to be conducted to the inside of the engine room of the vehicle.

  In addition, the general portion 23 in the first embodiment is configured to be continuous with the first gradually changing portion 24a and the second gradually changing portion 24b of the gradually changing portion 24. However, the second gradual change portion 24b may not be provided. That is, the maximum deviation part 25 may be formed such that the second boundary part 23b and the maximum deviation part 25 are located on a straight line parallel to the front-rear direction in FIG. Also in the second embodiment, similarly, the maximum deviation part 65 may be configured such that the second boundary part 63b and the maximum deviation part 65 are located on a straight line parallel to the front-rear direction in FIG.

  Further, in the gradually changing portion 74 in the third embodiment, the shape of the front surface 71 and the back surface 72 is an isosceles triangle in cross section, but this shape is not particularly limited, and may be, for example, a triangle in cross section or a semicircle in cross section. May be. In this case, the lengths of the first gradually changing portion 74a and the second gradually changing portion 74b in the gradually changing direction may be different. The same applies to the fourth and fifth embodiments.

  Further, in the third embodiment, the respective vertices of the isosceles triangle in cross section of the front surface 71 and the back surface 72 of the gradually changing portion 74 may not be provided so as to be located on straight lines parallel to each other in the front-rear direction. That is, the vertices of each other may be arranged at offsets. In this case, another third gradually changing portion is formed between the first gradually changing portion 74a and the second gradually changing portion 74b. Therefore, it is possible to produce a different gradation feeling. The same applies to the fourth and fifth embodiments.

  Further, in the third embodiment, the gradually changing surface (741a, 741b) on the surface 71 side of the gradually changing portion 74 is a gentler inclined surface than the gradually changing back surface (742a, 742b) on the rear surface 72 side. Instead of this, the gradually changing back surface (742a, 742b) may be a gentler inclined surface than the gradually changing surface (741a, 741b). The same applies to the fourth and fifth embodiments.

  Further, in the fifth embodiment, the gradual change portion 94 is such that the third gradual change portion 94c and the first gradual change portion 94a and the fourth gradual change portion 94d and the second gradual change portion 94b are centered on the maximum deviation portion 95. The shapes are symmetrical to each other. Instead of this, the gradual change portion 94 may be composed of the first gradual change portion 94a to the fourth gradual change portion 94d which are all different in shape. In this case, the first gradual change portion 94a to the fourth gradual change portion 94d all have different gradual change rates. Therefore, in the case of the vehicle decoration member in this case, four different gradation feelings can be continuously produced in the gradually changing portion, which is advantageous in further improving the design. Further, the gradual change portion 94 may have a configuration having four or more different gradual change sections.

The vehicle exterior decoration member 1 of the present invention can be expressed as follows. The reference numerals in parentheses are those used in the second to fifth embodiments.
[1] A base material made of a colored translucent body having a front surface 21 (61, 71, 81, 91) facing the outside of the vehicle and a rear surface 22 (62, 72, 82, 92) facing the back and formed of an uneven surface A vehicle exterior decoration member 1 comprising 2 (6, 7, 8, 9) and a light non-transmissive layer 3 formed on a back surface side of a base material,
As for the base material, the thickness 23h (63h, 73h, 83h, 93h) is a general part 23 (63, 73, 83, 93) which is constant at 2.5 mm or more and 4.0 mm or less, and the thickness gradually changes. And a part 24 (64, 74, 84, 94),
The gradually changing portion has a maximum deviation portion 25 (65, 75, 85, 95) that maximizes the difference in thickness from the general portion, and has at least one of the following characteristics <A> and <B>. Prepare
<A> The difference between the visible light transmittance in the maximum deviation portion and the visible light transmittance in the general portion is 5% or more. <B> When the L value of the Lab color system specified in JIS Z 8729 is assumed, The difference between the L value in the maximum deviation portion and the L value in the general portion is 2 or more. [2] The vehicle exterior decoration member according to [1], wherein the surface 21 (61) is a flat surface.
[3] The vehicle exterior decoration member according to [1], wherein the surface (71, 81, 91) is an uneven surface.
[4] The vehicle exterior decoration member according to any one of [1] to [3], wherein a difference in thickness between the maximum deviation portion and the general portion is 0.3 mm or more and 1.5 mm or less.
[5] The vehicle exterior decoration member according to any one of [1] to [4], wherein the gradually changing portion has a length in the gradually changing direction of 10 mm or more.
[6] The vehicle exterior decoration member according to any one of [1] to [5], which has a longitudinal length of 500 mm or more.
[7] The vehicle exterior decoration member according to any one of [1] to [6], wherein the gradual change portion is formed of a plurality of gradual change portions having different rates of gradual change in thickness.
[8] The gradual-change part has a maximum deviation part at the boundary and is continuous with the first gradual-change part 24a (64a, 74a, 84a, 94a) and the second gradual-change part 24b (64b, 74b, 84b, 94b). Equipped with
The vehicle exterior decoration member according to any one of [1] to [7], wherein the first gradual change portion and the second gradual change portion have opposite gradual change directions.
[9] The vehicle exterior decoration member according to [8], wherein the first gradually changing portion 24a (64a) is longer than the second gradually changing portion 24b (64b) in the gradually changing direction.
[10] A method for manufacturing the vehicle exterior decoration member 1 according to any one of [1] to [7],
The thickness of the gradually changing portion gradually increases from the general portion toward the maximum deviation portion,
In the molding die 4 including the first cavity 41 for molding the general portion and the second cavity 42 for molding the gradually changing portion 24, the fluid material is directed toward the side where the flow passage cross-sectional area in the second cavity 42 becomes large. A method for manufacturing a vehicle exterior decoration member, comprising an injection molding step of injecting a fluid material so as to flow.
[11] A method for manufacturing the vehicle exterior decorative member 1 according to [8] or [9],
The thickness of the gradually changing portion gradually increases from the general portion toward the maximum deviation portion,
A first cavity 41 for molding a general portion, a first gradually changing molding portion 42a for molding a gradually changing portion and a first gradually changing portion, and a second gradually changing molding portion 42b for molding a second gradually changing portion. The fluid material is injected into the molding die 4 including the second cavity 42 having the fluid material so that the fluid material flows from the first gradually changing portion 42a toward the second gradually changing portion 42b in the second cavity 42. A method for manufacturing a vehicle exterior decoration member including the injection molding step.

1: Vehicle exterior decoration member
2,6,7,8,9: Base material
21, 61, 71, 81, 91: surface
22, 62, 72, 82, 92: back surface
23, 63, 73, 83, 93: General part
24, 64, 74, 84, 94: Gradual change part
24a, 64a, 74a, 84a, 94a: 1st gradually changing part
24b, 64b, 74b, 84b, 94b: second gradual change part
25, 65, 75, 85, 95: maximum deviation part
3: Light non-transmissive layer
4: Mold 41: First cavity 42: Second cavity
42a: 1st gradual change molding part 42b: 2nd gradual change molding part

Claims (13)

A vehicle exterior including a base material made of a colored translucent body having a front surface facing the outside of the vehicle and a rear surface facing the back surface and having an uneven surface, and a light non-transmissive layer formed on the back surface side of the base material. A decorative member,
The base material has a general portion having a constant thickness of 2.5 mm or more and 4.0 mm or less and a gradually changing portion having a gradually changing thickness,
The gradually changing portion has a maximum deviation portion that maximizes the difference in thickness from the general portion,
The visible light transmittance in the thickness direction of the general portion is 25% or more and 40% or less, the visible light transmittance in the thickness direction of the maximum deviation portion is 10% or more and 25% or less,
A vehicle exterior decoration member having at least one of the following features (A) and (B).
(A) The difference between the visible light transmittance in the maximum deviation portion and the visible light transmittance in the general portion is 5% or more. (B) The L value of the Lab color system specified in JIS Z 8729 is assumed. At this time, the difference between the L value in the maximum deviation part and the L value in the general part should be 2 or more. A vehicle exterior including a base material made of a colored translucent body having a front surface facing the outside of the vehicle and a rear surface facing the back surface and having an uneven surface, and a light non-transmissive layer formed on the back surface side of the base material. A decorative member,
The base material has a general portion having a constant thickness of 2.5 mm or more and 4.0 mm or less and a gradually changing portion having a gradually decreasing thickness,
The gradual change part has a maximum deviation part that maximizes the difference in thickness from the general part, and is a vehicle exterior decoration member having at least one of the following features (A) and (B).
(A) The difference between the visible light transmittance in the maximum deviation portion and the visible light transmittance in the general portion is 5% or more. (B) The L value of the Lab color system specified in JIS Z 8729 is assumed. At this time, the difference between the L value in the maximum deviation part and the L value in the general part should be 2 or more. The vehicle exterior decoration member according to claim 1 , wherein the surface is a flat surface. The vehicle exterior decoration member according to claim 1 , wherein the surface is an uneven surface.   The vehicle exterior decoration member according to claim 4, wherein a concave portion that is recessed toward the back surface side with respect to the surface forming the general portion is formed on the surface forming the gradually changing portion. The vehicle exterior decoration member according to any one of claims 1 to 5 , wherein a difference in thickness between the maximum deviation portion and the general portion is 0.3 mm or more and 1.0 mm or less. The vehicle exterior decoration member according to any one of claims 1 to 6 , wherein the gradually changing portion has a length in a gradually changing direction of 10 mm or more. The vehicle exterior decoration member according to any one of claims 1 to 7 , wherein a length in a longitudinal direction is 500 mm or more. The vehicle exterior decoration member according to any one of claims 1 to 8 , wherein the gradually changing portion is formed of a plurality of gradually changing portions having different rates of gradually changing thickness. The gradual change part includes a first gradual change part and a second gradual change part which have the maximum deviation part at the boundary and are continuous,
The vehicle exterior decoration member according to any one of claims 1 to 9 , wherein the first gradually changing portion and the second gradually changing portion have opposite gradually changing directions. The vehicle exterior decoration member according to claim 10 , wherein the first gradually changing portion has a longer length in the gradually changing direction than the second gradually changing portion. It is a manufacturing method of the vehicle exterior decoration member according to any one of claims 1 to 3 to 9 ,
The gradually changing portion has a thickness that gradually increases from the general portion toward the maximum deviation portion,
A fluid material flows in a mold having a first cavity for molding the general portion and a second cavity for molding the gradually changing portion toward a side of the second cavity having a larger flow passage cross-sectional area. A method for manufacturing a vehicle exterior decoration member, comprising the injection molding step of injecting the fluid material. It is a manufacturing method of the vehicle exterior decoration member according to claim 10 or 11 ,
The gradually changing portion has a thickness that gradually increases from the general portion toward the maximum deviation portion,
A first cavity for molding the general part, a first gradual molding part for molding the gradual change part and for molding the first gradual change part, and a second gradual change molding part for molding the second gradual change part. And a second cavity having a second cavity, the fluid material is injected so that the fluid material flows in the second cavity from the first gradually changing molding portion toward the second gradually changing molding portion. A method for manufacturing a vehicle exterior decoration member including the injection molding step.

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