JP2009120120A - Ornament member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively express interference colors so as to express a unique design. <P>SOLUTION: An ornament member comprises: a transparent resin substrate 2 having a design surface; an irregular surface 22 having cyclic irregular parts formed on a surface opposing to the design surface of the transparent resin substrate 2; an intermediate layer 3 overlying the irregular surface 22 and having a light refraction index that is different from the transparent resin substrate 2; and a colored layer 4 formed on the surface of the intermediate layer 3. The color difference between a background color and an interference color is increased by optimally selecting a pitch of the cyclic irregular part 22 and a color tone of the colored layer 4. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to decorative members such as logo marks, ornaments, and emblems used in automobiles and home appliances.

  For automobiles, decorative members such as a manufacturer's mark, an ornament representing a vehicle type, an emblem, and a front grill garnish are used. These decorative members are generally formed from a resin base material, and often have a design in which a bright portion is lifted and exposed in a background portion.

  When manufacturing such a decorative member, it is important to cut off the bright part and the background part. Therefore, as a conventional method for producing a decorative member, there is a method in which a bright portion is formed on the surface of a resin base material by a vapor deposition method and a background portion is formed by painting. In the vapor deposition method, a metal vapor deposition film is formed on the entire surface of the resin substrate. First, the surface where the bright part is formed is covered with masking, and the background part is formed by painting on the surface other than the bright part, and the masking is removed. After that, the bright part is formed by vapor deposition or the like.

  However, when the background portion is formed by painting, the film thickness varies, and the paint may accumulate at the corner portion of the recess. In such a case, when viewed from the surface of the transparent resin base material, there may be a case where an appearance defect such as a brilliant portion looks distorted occurs.

  Therefore, it is conceivable to form a background portion by printing. In other words, if the surface of the resin substrate as a background portion is formed in a convex shape and the background portion is formed on the surface by screen printing, masking is unnecessary, and the parting between the convex portion and the concave portion can be sharply formed. . It is also easy to form a gradation design.

  For example, in Japanese Patent Application Laid-Open No. 2004-251868, a film having a printing surface having a predetermined design and a deposition design surface on which a metal material is deposited is formed, and the film is shaped into a predetermined three-dimensional shape. A method for forming a transparent resin substrate by placing it in a post-molding die has been proposed. According to this method, even if it is a decorative member with a three-dimensional curved surface shape, it is possible to sharply form the parting between the bright part and the background part, and it is possible to easily form a gradation design because it can be screen printed on a flat film. Can do.

  By the way, on the surface of the compact disc, a rainbow-colored interference color is visually recognized together with a metallic luster, and a unique design is expressed. If such an interference color is used for an automobile emblem or the like, it is conceivable that the design as a decorative member is further improved.

Japanese Patent Application Laid-Open No. 2001-107256 proposes a laminated product in which regular irregularities are formed on the surface of a transparent resin substrate, and a metal layer is laminated on the surface via a primer layer. In this laminated product, when viewed at a predetermined angle with respect to the surface of the transparent resin substrate, the metallic luster of the metal layer and the interference color at the concavo-convex portion are visually recognized.
JP 2004-251868 JP 2001-107256 A

  However, in the laminated product described in Patent Document 2, since the color difference between the metallic luster and the interference color is small, a sufficient design was not exhibited when the degree of interference was weak. This invention is made | formed in view of such a situation, and makes it the subject which should be solved to express an interference color effectively.

  The feature of the decorative member of the present invention that solves the above problems is a rugged surface having a transparent resin base having a design surface visually recognized from the outside and a periodic rugged portion formed on the surface opposite to the design surface of the transparent resin base. And an intermediate layer laminated on the concavo-convex surface and having an optical refractive index different from that of the transparent resin substrate, and a colored layer formed on the surface of the intermediate layer, the interference color with the color tone of the colored layer from the design surface as a background Is to be visually recognized.

  According to the decorative member of the present invention, the interference color with the background of the color tone of the colored layer is visually recognized. Therefore, by optimally selecting the pitch of the periodic uneven portions and the color tone of the colored layer, the color difference between the background color and the interference color can be increased, and the interference color can be made conspicuous even if the degree of interference is small. Therefore, an unprecedented design can be expressed.

  The decorative member of the present invention includes a transparent resin substrate, an intermediate layer, and a colored layer. The transparent resin substrate can be formed by injection molding or the like from a resin having excellent transparency such as polymethyl methacrylate (PMMA) or polycarbonate (PC). The thickness is not particularly limited.

  This transparent resin substrate has a design surface that is exposed to the outside, and has a concavo-convex surface having periodic concavo-convex portions on the surface opposite to the design surface. An intermediate layer having an optical refractive index different from that of the transparent resin substrate is formed on the uneven surface. Therefore, among the light incident on the transparent resin substrate, there is light that is reflected from the uneven surface or the interface with the intermediate layer and transmitted through the transparent resin substrate again and emitted from the transparent resin substrate. At this time, an optical path difference is generated between the reflected lights reflected by the periodic uneven portions, and the interference light corresponding to the optical path difference is visually recognized.

  Light incident on the transparent resin substrate is reflected at the uneven surface, reflected at the interface with the intermediate layer, transmitted through the intermediate layer and reflected at the colored layer, and absorbed by the colored layer. It is divided into. In order to strongly develop the interference color, it is desirable that there is a large amount of reflected light whose optical path difference is a predetermined value, and it is desirable that the light whose optical path difference is not a predetermined value, that is, the light that is irregularly reflected is as small as possible. Accordingly, the cross-sectional shape of the periodic concavo-convex portion can be a trapezoid, a waveform, a rhombus, a rectangle, or the like, but is preferably a cross-section rectangle or a trapezoid with little irregular reflection.

  For example, it is assumed that the light incident on the transparent resin substrate 100 is reflected on the uneven surface as shown in FIG. When viewed from an oblique direction inclined with respect to the surface of the transparent resin substrate 100, the optical path difference (L) between the light reflected by a certain concave portion 101 and the light reflected by an adjacent concave portion 102 is an integer of the wavelength (λ). When it is doubled, an interference color of that wavelength (λ) is observed.

  Therefore, the pitch (d) dimension is important for the periodic concavo-convex portions, and the ridges having a rectangular cross section are arranged at intervals of 0.1 to 4 μm, that is, the pitch (d) is arranged at 0.1 to 4 μm. desirable. If the pitch (d) exceeds 4 μm or becomes narrower than 0.1 μm, the interference color is too weak to be visually recognized.

  Further, in the case where the periodic concavo-convex portion is biased in the viewing direction, it is desirable that the concave portion and the convex portion are periodically continued in the viewing direction. For example, in the case of a front grill garnish, since it is often seen from above, the concave and convex portions are periodically arranged in the vertical direction when attached to a vehicle, and each concave portion and As for a convex part, it is desirable to comprise so that it may extend in a horizontal direction. By doing so, the interference color is the strongest when viewed from above.

  That is, it is desirable that the periodic concavo-convex portions are periodically arranged in a direction substantially parallel to the direction in which the concave and convex portions are seen. The concave and convex portions may be dotted in the form of dots, but they extend in a direction substantially perpendicular to the direction in which the linearly extending convex and concave strips are seen, and alternate along the direction in which they are seen. It is desirable that they are lined up.

  The intermediate layer is formed of a material having a light refractive index different from that of the transparent resin substrate. Since the refractive index of PC is 1.49 and that of PMMA is 1.41, a material having a refractive index different from these can be used. For example, titanium oxide (TiO2) has a refractive index of about 1.8, and can be suitably used. COP (cycloolefin polymer) can also be used. Furthermore, since the refractive index of air is 1.0, the intermediate layer may be an air layer in some cases.

  The difference between the refractive index of the transparent resin substrate and the refractive index of the intermediate layer is preferably 0.05 or more, and more preferably 0.3 or more. If the difference in refractive index is less than 0.05, the amount of light reflected at the interface between the transparent resin substrate and the intermediate layer is reduced, and the intensity of interference light is reduced. Further, as the thickness of the intermediate layer becomes thinner, the light reflected at the interface between the transparent resin substrate and the intermediate layer decreases, and the intensity of the interference light decreases. Therefore, it is desirable that the thickness of the intermediate layer is not less than the thickness of the visible light wavelength band (about 0.3 μm to about 0.8 μm). There is no particular upper limit on the thickness of the intermediate layer.

  This intermediate layer may be formed by molding, or may be formed using an alkoxide method, a vapor deposition method, a sputtering method, or the like.

  A colored layer is formed on the surface of the intermediate layer. This colored layer can be formed by printing or painting. The color tone of the colored layer is preferably a dark color in which the interference color is clearly visible, and is preferably dark blue or black.

  Since the colored layer is generally thin, the design is damaged if scratches or the like occur. Therefore, it is desirable to further form a protective layer on the surface of the colored layer. The material of the protective layer is not particularly limited, and can be formed from various resins such as ABS and PP. If a colored resin is used, this protective layer can also serve as a colored layer.

  Hereinafter, the present invention will be described specifically by way of examples.

  FIG. 1 is a plan view of the front grill garnish of the present embodiment, and FIG. The front grill garnish 1 includes a ring-shaped rim portion 10 having a metallic luster design, a substantially T-shaped mark portion 11 having a metallic luster design, and a dark blue background portion 12.

  This front grill garnish 1 includes an elliptical plate-like transparent resin substrate 2 made of PC, a transparent intermediate layer 3 made of a TiO 2 film, a colored layer 4 formed by printing, a vapor deposition layer 5 made of metallic aluminum, It is comprised from the base 6 made from ABS. Hereinafter, the manufacturing method of the front grill garnish 1 will be described with reference to FIG.

  First, the transparent resin substrate 2 shown in FIG. 3A was formed by injection molding from a PC. The transparent resin substrate 2 has a smooth curved design surface 20, and a concave portion 21 corresponding to the shape of the edge portion 10 and the mark portion 11 is formed on the back surface thereof. Further, on the back surface other than the concave portion 21, a concave-convex surface 22 having periodic concave-convex portions is formed. The concave / convex surface 22 is formed by alternately arranging grooves having a depth of 1 μm and ridges having a height of 1 μm at a pitch of 1 μm. The concave-convex surface 22 is formed such that concave grooves and protrusions are periodically arranged in the minor axis direction and extend in a direction along the ring-shaped rim portion 10.

  Next, as shown in FIG. 3B, a transparent intermediate layer 3 made of TiO 2 was formed on the entire back surface of the transparent resin substrate 2 by vapor deposition. The intermediate layer 3 fills the concave portion of the concave / convex surface 22 and is formed with a thickness of about 1 μm on the entire back surface.

  Subsequently, as shown in FIG. 3C, a colored layer 4 was formed on the surface of the intermediate layer 3 excluding the concave portion 21 by screen printing using dark blue ink. The thickness of the colored layer 4 is several μm.

  Next, as shown in FIG. 3D, a vapor deposition layer 5 made of metallic aluminum was formed on the entire surface of the colored layer 4 and the surface of the intermediate layer 3 formed in the recess 21 by vacuum vapor deposition.

  The intermediate obtained as described above was placed in a mold, and a base 6 made of ABS resin was formed on the surface of the vapor deposition layer 5 by injection molding (FIG. 3E).

  In the front grill garnish 1 of this embodiment, when viewed from the design surface, the metallic luster of the vapor deposition layer 5 passes through the transparent resin substrate 2 and the intermediate layer 3 to the portion corresponding to the concave portion 21 (the edge portion 10 and the mark portion 10). The design appears. On the other hand, in the background portion 12, the dark blue color tone of the colored layer 4 appears through the transparent resin substrate 2 and the intermediate layer 3, and the interference color developed on the uneven surface 22 appears through the transparent resin substrate 2. The interference color has various color tones depending on the viewing direction, but the vivid color tone is expressed and high design is provided due to the high intensity of the interference color and the background of the dark blue color tone of the colored layer 4.

  Further, the front grill garnish 1 of this embodiment is attached to the vehicle so that the major axis of the ellipse is in the horizontal direction. And since the concave grooves and ridges of the concavo-convex surface 22 are formed extending in the direction along the ring-shaped rim portion 10, the concave grooves and ridges are arranged in the vertical direction and extend long in the substantially major axis direction. When viewed from above, the interference color is particularly strong and high designability is exhibited.

It is a top view of the front grill garnish which concerns on one Example of this invention. It is principal part sectional drawing of the front grill garnish which concerns on one Example of this invention. It is explanatory sectional drawing which shows the manufacturing process of the front grill garnish which concerns on one Example of this invention. It is sectional drawing explaining the interference effect | action of a periodic uneven part.

Explanation of symbols

1: Front grill garnish 2: Transparent resin base 3: Intermediate layer 4: Colored layer 5: Deposition layer 6: Base
10: Border 11: Mark
12: Background

Claims (3)

A transparent resin substrate having a design surface visible from the outside;
An irregular surface having a periodic irregularity formed on the surface opposite to the design surface of the transparent resin substrate;
An intermediate layer laminated on the uneven surface and having a refractive index different from that of the transparent resin substrate;
And a colored layer formed on the surface of the intermediate layer, wherein an interference color with the color tone of the colored layer as a background is visually recognized from the design surface.   2. The decorative member according to claim 1, wherein the periodic concavo-convex portions are formed by arranging ridges having a rectangular cross section at intervals of 0.1 to 4 μm.   The periodic concavo-convex portions are periodically arranged in a direction substantially parallel to a direction in which the concave portions and the convex portions are seen, and the concave portions and the convex portions are respectively extended in a direction substantially perpendicular to the seen direction. The decorative member according to claim 1 or 2.

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