decorative objects

Abstract

To provide a decorative body which can generate a difference between colors of a design with less processes.SOLUTION: There is provided a decorative body 101 in which a design surface Sf is composed of a colored transparent material 3 formed of a colored and transparent resin material, and a rear face Sr of the colored transparent material 3 is plated. in the colored transparent material 3, at least a part of the rear face Sr is subjected to serration cutting with a sawtooth cross section in a plate thickness direction. A virtual surface connecting a groove bottom of the sawtooth is used as a reference surface So. In two surfaces constituting the one sawtooth, a surface on a side with a relatively smaller elevation angle to the reference surface So is defined as a dark surface Sa, and a surface with a relatively large elevation angle to the reference surface So is defined as a shielding surface Sb. An elevation angle θa of the dark surface Sa is 43° or more and 50° or less, and an elevation angle θb of the shielding surface Sb is 85° or more and 87° or less.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a plate-shaped decorative body made of a colored transparent resin material. [Background technology]

[0002] Conventionally, decorative plates used for vehicle exterior parts such as emblems have been known in which patterns or colors are applied to the back surface of a transparent resin member by painting or printing. <1> Forming surface designs using molds, <2> Black paint (or printing), <3> It is manufactured by painting (or vapor-depositing) the plated parts with a silver metallic finish.

[0003] Additionally, for example, Patent Document 1 discloses an exterior vehicle component in which a design member made of a transparent resin material is fixed to the surface of a black base member. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-195161 Summary of the Invention [Problem to be solved by the invention]

[0005] The conventional manufacturing method, which involves both black painting and plating to create a difference in color design, has the problem of requiring many steps.

[0006] The present invention was created in view of the above points, and its object is to provide a decorative body that can produce a difference in color design with a small number of steps. [Means for solving the problem]

[0007] The decorative body according to the present invention has a design surface (Sf) formed of a colored transparent material (3) molded from a colored transparent resin material, and a plated portion is applied to the back surface (Sr), which is the surface opposite to the design surface of the colored transparent material.

[0008] For colored transparent materials, Only some The plate has serrated cuts in the thickness direction, with a sawtooth cross section.

[0009] The imaginary plane connecting the groove bottoms of the sawtooth is defined as the reference plane (So). Of the two surfaces that make up one sawtooth, the surface with a relatively smaller elevation angle to the reference plane is defined as the dark surface (Sa), and the surface with a relatively larger elevation angle to the reference plane is defined as the shielding surface (Sb). The elevation angle of the dark surface (θa) is between 43° and 50°, and the elevation angle of the shielding surface (θb) is between 85° and 87°.

[0010] Preferably, the saw from the reference plane in the serration cut teeth The height (H) of the colored transparent material is 0.5 mm or more and 2 mm or less. Preferably, the thickness (T) of the colored transparent material is 5 mm or less, and the base thickness (To), which is the distance from the design surface to the reference surface, is 2 mm or more.

[0011] In this invention, by applying serration cuts under suitable conditions to the backside of the colored transparent material, it is possible to achieve a difference in color design in just two processes: molding and plating. This reduces the number of processes compared to conventional manufacturing methods. [Brief explanation of the drawings]

[0012] [Figure 1] 1A is a front view of a decorative article according to a first embodiment, and FIG. 1B is a schematic cross-sectional view taken along line Ib-Ib. [Figure 2] (a) Front view of the decorative object of the comparative example, (b) Schematic diagram of the cross section taken along line IIb-IIb. [Figure 3] Schematic cross-sectional view of the serration cut portion in Figure 1. [Figure 4] (a) Enlarged view of Fig. 3, (b) Enlarged view of part IVb. [Figure 5] FIG. 10 is a diagram illustrating the effect on light from the front. [Figure 6] FIG. 10 is a diagram illustrating the effect on light from above the front. [Figure 7] 10A and 10B are diagrams illustrating the effect on light incident perpendicularly on a dark surface. [Figure 8] 10A and 10B are diagrams illustrating the effect on light incident at an angle slightly different from the direction perpendicular to the dark surface. [Figure 9] FIG. 10 is a diagram showing the relationship between the plate thickness and transmittance of a colored transparent material. [Figure 10] A diagram showing the method for measuring the L value of a colored transparent material with serration cuts. [Figure 11] FIG. 10 is a graph showing the relationship between the height of the serration cut and the L value measurement results. [Figure 12] 10A is a front view of a decorative body according to a second embodiment, and FIG. 10B is a schematic cross-sectional view taken along line XIIb-XIIb. [Figure 13] (a) Front view of diamond-cut shape A, (b) schematic cross-sectional view along line XIIIb-XIIIb. [Figure 14] FIG. [Figure 15] (a) Front view of diamond-cut shape B, (b) schematic cross-sectional view of line XVb-XVb. [Figure 16] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, decorative bodies according to embodiments of the present invention will be described with reference to the drawings. This decorative body is formed into a plate shape from a colored transparent resin material and is used as an exterior vehicle part such as an emblem. The first embodiment shown in FIG. 1 and the second embodiment shown in FIG. 12 are cut by a saw with a serration cut. teeth Only the direction is different, and the basic action and effect are the same.

[0014] (First embodiment) Referring to Figures 1 and 2, a first embodiment and a comparative example will be compared and explained as decorative bodies intended for vehicle emblems. This comparative example corresponds to a general conventional product. In the following specification, except for certain parts, the first embodiment will be referred to as "this embodiment." Figure 1(a) shows a front view of the decorative body 101 of this embodiment, and Figure 2(a) shows a front view of the decorative body 109 of the comparative example. Figures 1(b) and 2(b) show longitudinal cross sections of each figure (a). Note that detailed illustration of the serration cut portion 4 on the back surface Sr is omitted in Figure 2(b), and a schematic cross-sectional view is shown in Figure 3.

[0015] While cross-sectional views of resin members are generally indicated with resin hatching, in the drawings of this application, resin hatching is omitted from cross-sectional views of colored transparent materials. This is to prevent the lines of light from overlapping with the hatching lines, making them difficult to see, for example, in Figures 5 to 8. Therefore, in the [Drawing Description] section, the term "schematic diagram showing a cross section" is used instead of "cross-sectional view."

[0016] In both the decorative bodies 101 and 109 of this embodiment and the comparative example, the design surface Sf is composed of a colored transparent material 3 molded from a colored transparent resin material. The colored transparent material 3 is molded from a PMMA (acrylic) material or a PC (polycarbonate) material. In this embodiment, "colored" refers to a dark smoky color.

[0017] Furthermore, in both the decorative bodies 101 and 109 of this embodiment and the comparative example, a plating coating is applied as a "plating treatment" to the back surface Sr, which is the surface opposite the design surface Sf of the colored transparent material 3. The white portion in the front view represents the plating portion 5. Specifically, the plating coating is a silver metallic coating. The "plating treatment" may also be performed by vapor deposition.

[0018] Furthermore, in the decorative body 109 of the comparative example, the black portion 6 is painted (or printed) in addition to the plated portion 5. In an emblem, it is required to create a difference in the color of the design between the black portion 6 and the plated portion 5. However, the manufacturing method of the comparative example, which performs both the black portion painting process and the plated portion painting process to create a difference in the color of the design, has the problem of requiring more steps.

[0019] In contrast, in the decorative body 101 of this embodiment, the black coating is eliminated, and serration cuts are applied to the back surface Sr of the colored transparent material 3, the cross section of which is sawtooth in the thickness direction. teeth The serrated cuts 4, which attenuate light, are used to create darkness instead of the black areas 6 used in the comparative example, allowing for the creation of a distinctive color design in just two steps: molding and painting the plated area. This reduces the number of steps compared to the manufacturing method used in the comparative example.

[0020] The technical features of this embodiment are as follows.

[0021] 1. By using a colored transparent material 3 that exhibits a smoky color, the smoky effect attenuates light compared to a colorless transparent material, making the material appear darker.

[0022] 2. The design surface Sf that is observed by the consumer is made of a colored transparent material 3. If the painted surface were used as the design surface, all of the diffusely reflected light would enter the eye as is, so it would remain bright and would not become dark.

[0023] 3. It is possible to clearly differentiate colors by specifying the dimensional conditions such as the shape and angle of the serration cuts made on the back surface Sr of the colored transparent material 3. Details will be described later.

[0024] 4. Metallic paint is mainly used for the plating part 5 on the back surface Sr. The metallic painted part causes diffuse reflection, making it appear bright, creating a contrast with the dark part created by the serration cut.

[0025] [Serration cutting conditions] Next, with reference to Figures 3 and 4, the shape of the serration cuts in this embodiment and the preferred conditions for dimensions such as angle and plate thickness will be described. The colored transparent material 3 has serration cuts on at least a portion of the back surface Sr, with a cross section in the plate thickness direction that is sawtooth-shaped. The imaginary plane connecting the groove bottoms of the sawtooth is defined as the reference plane So. Of the two surfaces that make up one sawtooth, the surface with a relatively smaller elevation angle θa with respect to the reference plane So is defined as the "dark surface Sa," and the surface with a relatively larger elevation angle θb with respect to the reference plane So is defined as the "shading surface Sb."

[0026] As shown in Figure 3, the thickness T of the colored transparent material 3 is 5 mm or less. Generally, for automobile exterior parts, a thickness exceeding 5 mm is too thick. In addition, in order to ensure molding quality, the sawtooth distance from the reference plane So is teeth The height H of the surface shall be 0.5 mm or more and 2 mm or less, and the base thickness To, which is the distance from the design surface Sf to the reference surface So, shall be 2 mm or more.

[0027] As shown in Figure 4(a), the elevation angle θa of the dark surface Sa is set to 43° or more and 50° or less. The lower limit is based on the critical angle of the resin material that makes up the colored transparent material 3, i.e., the minimum angle at which light is reflected when the angle of incidence exceeds that angle. The critical angle of PMMA, which is used as the resin material for the colored transparent material 3, is 42.2°, while the critical angle of PC is 39.12°. Therefore, by setting the lower limit at 43° based on the larger critical angle of 42.2° for PMMA, an angle range greater than the critical angle is set for both PMMA and PC.

[0028] The upper limit is determined by the general mold strength and molding conditions. Generally, for molded products with uneven shapes, it is preferable to set the upper limit of the width-to-height ratio (H / W) at 1; if it is greater than this, the strength cannot be maintained and it will not be viable as a product. Here, as shown in Figure 4(b), in the manufacturing of the mold, teethThe tip of the tool has a rounded corner shape with a radius of 0.1 to 0.3, following the radius of the tip of the end mill. If there were no radius, the width-to-height ratio (H / W) at θa = 50° would be slightly greater than 1, but the height H would be lower due to the radius of the corner. Therefore, by setting the upper limit at θa = 50°, the width-to-height ratio (H / W) can be kept within 1. Note that the radius of the corner is not shown in any figures other than Figure 4(b).

[0029] 4(a), the elevation angle θb of the shielding surface Sb is set to 85° or more and 87° or less. Theoretically, the elevation angle θb of the shielding surface Sb may be 90°, but in practice, a draft angle of 3 to 5° must be ensured during molding.

[0030] To summarize the above, the optimal conditions for serration cutting are as follows: T≦5mm 0.5mm≦H≦2mm 2mm≦To 43°≦θa≦50° 85°≦θb≦87°

[0031] [Relationship between the direction of light incidence and the maintenance of darkness] 5 to 8, the operation of maintaining darkness by attenuating light incident from various directions using the serration cut portion 4 will be described. This explanation is based on the premise that when the angle of incidence is equal to or greater than the critical angle, light is specularly reflected from the surface of the colored transparent material 3.

[0032] (1.Front light) As shown in Figure 5, light incident from the front of the design surface Sf is reflected by the dark surface Sa and is attenuated by hitting the shielding surface Sb, so the design surface Sf appears dark.

[0033] (2. Light from above the front) As shown in Figure 6, light incident from above the front of the design surface Sf is also reflected by the dark surface Sa and attenuated by hitting the shielding surface Sb, so the design surface Sf appears dark.

[0034] (3. Light incident perpendicular to a dark surface) As shown in Figure 7, consider the case where light is incident on the dark surface Sa at a right angle. In this case, the angle of incidence on the design surface Sf is equal to the elevation angle θa of the dark surface Sa. Part of the light is specularly reflected by the dark surface Sa and travels inside the colored transparent material 3 toward the design surface Sf. The angle of incidence of the reflected light on the design surface Sf is equal to the elevation angle θa of the dark surface Sa and is greater than the critical angle of the colored transparent material 3, so the reflected light is re-reflected without being transmitted to the outside. In this way, darkness is maintained as the light is repeatedly reflected inside the colored transparent material 3. The repeatedly reflected light finally hits the shading surface Sb and is attenuated.

[0035] (4. Light incident at an angle slightly off the normal to the dark surface) As shown in Figure 8, a portion of light incident at an angle slightly off the perpendicular direction to the dark surface Sa is reflected by the dark surface Sa. Because the angle of incidence of the reflected light on the design surface Sf (for example, approximately 40°) is smaller than the critical angle, the reflected light is transmitted to the outside. However, because the distance from the design surface Sf to the reference surface So is 2 mm or more, the distance that the light travels back and forth within the colored transparent material 3 is 5 mm or more, and the light is attenuated during this travel. Furthermore, because a dark-colored (smoke-colored) colored transparent material 3 is used in this embodiment, darkness is maintained in addition to the light attenuation effect.

[0036] As described above, light incident from any angle is attenuated by being reflected one or more times inside the smoke-colored transparent material 3. Also, diffuse reflected light, which is weaker than specular reflected light, becomes even darker due to the effect of the smoke color. Therefore, in this embodiment, the serration cut satisfies the conditions, allowing for optimal color differentiation in the design.

[0037] [Example of colored transparent material specifications] The colored transparent material used to verify the effects of this embodiment is "COMOGLASS / 530k / gray smoke." Figure 9 shows the relationship between the plate thickness and transmittance of this material. The visible light transmittance measuring device used was a TINT METER MODEL 2000JP. As the plate thickness increases from 2 mm to 5 mm, the transmittance monotonically decreases from approximately 50 to approximately 20. If a material with transmittance characteristics equivalent to this material is used, the above-mentioned effects can be reproduced.

[0038] [Measurement results of brightness (L value) of colored transparent material with serrated cuts] See Figures 10 and 11 for the saw used in serration cutting. teeth The relationship between the height and brightness will be explained. As shown in Figure 10, the common conditions are that the base thickness To excluding the serration cut portion 4 is 2 mm, and the elevation angle θa of the dark surface Sa is 50°. The back surface Sr of the colored transparent material 3 is coated with a silver metallic paint as a plating treatment 5. The measuring instrument used is a KONICA MINOLTA CM-700d.

[0039] The measurement results are shown in Figure 11. The L value without serration cuts is approximately 53, which is within the numerical range of 50 to 60 that corresponds to dark trivalent plating. teeth When the height H of the saw blade is changed from 0.2 mm to 2.0 mm, teeth When the height H of the serrations is 0.4 mm or more, the L value is 30 to 32, which is judged to be "almost black." From this result, it was verified that by providing serration cuts, it is possible to express the difference in color between the dark parts of the colored transparent material 3 and the light parts of the plated part 5.

[0040] (Second embodiment) In the decorative body 102 of the second embodiment shown in FIG. 12, the saw of the serration cut portion 4 teeth If the dimensions of the serration cut portion 4 satisfy the above conditions, teeth The same effect can be obtained regardless of the direction.

[0041] [Applied shape] As an example of an applied shape of serration cuts, diamond cut shape A is shown in Figures 13 and 14, and diamond cut shape B is shown in Figures 15 and 16. In both diamond cut shapes A and B, approximately rectangular unit blocks are regularly arranged vertically and horizontally. The unit blocks of diamond cut shape A have symmetrical inclined lines that descend inward from the upper left and upper right corners. The unit blocks of diamond cut shape B have the same inclined lines as diamond cut shape A, which are formed in a V shape toward the midpoint of the bottom side.

[0042] In both diamond cut shapes A and B, the dimensions of the serration cut portion 4 provided along the longitudinal cross section satisfy the above conditions. By providing a serration cut portion 4 that satisfies the above conditions, it becomes possible to expand the shape variations that can produce a darker color in the design.

[0043] (Other embodiments) The decorative body of the present invention is not limited to vehicle exterior parts such as emblems, but can be applied to any article that requires a design color difference between dark and light areas.

[0044] The present invention is not limited to the above-described embodiment, and can be embodied in various forms without departing from the spirit of the invention. [Explanation of symbols]

[0045] 101, 102...Decorative body, 3...Colored transparent material, 4 Serration cut portion, 5 Plated portion, Sf: Design surface, Sr: Back surface, So...reference surface, Sa: dark surface, θa: elevation angle of the dark surface, Sb...screening surface, θb...elevation angle of screening surface. H...saw teeth Height, T: Thickness of colored transparent material, To: Base thickness.

Claims

1. A decorative body in which a design surface (Sf) is constituted by a colored transparent material (3) molded from a colored transparent resin material, and a plating process is performed on a back surface (Sr) of the colored transparent material, which is the surface opposite to the design surface, The colored transparent material has a serration cut on only a part of the back surface, the serration cut having a sawtooth cross section in the thickness direction of the plate, If an imaginary plane connecting the groove bottoms of the sawtooth is defined as a reference plane (So), and of the two surfaces constituting one sawtooth, the surface with a relatively small angle of elevation with respect to the reference plane is defined as a dark surface (Sa), and the surface with a relatively large angle of elevation with respect to the reference plane is defined as a shielding surface (Sb), then: the elevation angle (θa) of the dark surface is equal to or greater than 43° and equal to or less than 50°; The decorative body has an elevation angle (θb) of the shielding surface of 85° or more and 87° or less.

2. 2. The decorative body according to claim 1, wherein the height (H) of the sawtooth from the reference plane in the serration cut is 0.5 mm or more and 2 mm or less.

3. The plate thickness (T) of the colored transparent material is 5 mm or less, 3. The decorative body according to claim 1, wherein a base thickness (To), which is the distance from the design surface to the reference surface, is 2 mm or more.

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