Decoration member and method for manufacturing decoration member

Abstract

The disclosed relates to a decoration element and a method for preparing the decoration element. The decoration element has dichroism expressing different colors depending on a viewing direction, and has improved visibility of the dichroism.

Claims

1. A decoration element comprising: a pattern layer comprising a surface having a plurality of first convex portions, each of the first convex portions comprising first and second inclined surfaces having different inclined angles; and an inorganic material layer formed on the top of the first convex portions, wherein the decoration element has dichroism expressing different colors, wherein the inorganic material layer comprises a first inorganic material layer on the top of the first inclined surface and a second inorganic material layer on the top of the second inclined surface, wherein only the first inorganic material layer formed on the first inclined surface and only the second inorganic material layer formed on the inclined second surface, wherein the first and the second inorganic material layers comprise different materials or have different thicknesses, wherein the surface of the pattern layer further comprises a second convex portion having a smaller height compared to the first convex portion between the adjacent first convex portions, wherein the height of the second convex portion is in a range of ⅕ to ¼ of the height of the first convex portion, wherein a width of the first convex portion is from 15 μm to 90 μm, and wherein a width of the second convex portion is from 1 μm to 10 μm.

2. The decoration element of claim 1, wherein an angle formed by the first inclined surface and the second inclined surface is in a range of 80 degrees to 100 degrees.

3. The decoration element of claim 1, wherein a difference in the inclined angles of the first inclined surface and the second inclined surface is in a range of 30 degrees to 70 degrees.

4. The decoration element of claim 1, wherein the pattern layer has a flat portion on an opposite side surface of the surface forming the first convex portion, and the flat portion is formed on a substrate layer.

5. The decoration element of claim 1, wherein the pattern layer comprises a thermocurable resin or an ultraviolet curable resin.

6. The decoration element of claim 1, further comprising a color dye inside or below the pattern layer.

7. The decoration element of claim 1, wherein each of the first inorganic material layer and the second inorganic material layer is a single layer or a multilayer comprising one or more types of materials selected from among indium (In), titanium (Ti), tin (Sn), silicon (Si), germanium (Ge), aluminum (Al), copper (Cu), nickel (Ni), vanadium (V), tungsten (W), tantalum (Ta), molybdenum (Mo), neodymium (Nd), iron (Fe), chromium (Cr), cobalt (Co), gold (Au) and silver (Ag), or oxides, nitrides or oxynitrides thereof, and optionally one or more types of materials among carbon and carbon composites.

8. The decoration element of claim 1, wherein the surface of the pattern layer has a shape in which a tip portion of the first convex portion further comprises a concave portion having a smaller height compared to the first convex portion.

9. The decoration element of claim 8, wherein the concave portion has a shape comprising two inclined surfaces having different inclined angles.

10. The decoration element of claim 1, wherein the pattern layer comprises a first area in which the second inclined surface has a larger inclined angle compared to the first inclined surface, and a second area in which the second inclined surface has a larger inclined angle compared to the first inclined surface.

11. A method for preparing the decoration element of claim 1, the method comprising: providing the pattern layer comprising the surface having the plurality of first convex portions, each of the first convex portions comprising first and second inclined surfaces having different inclined angles, and depositing the first and second inorganic material layers on the first and the second inclined surfaces, respectively, wherein the first and the second inorganic material layers are deposited using different materials or with different thicknesses.

12. The method for preparing a decoration element of claim 11, wherein the depositing of first and second inorganic material layers is carried out using a sputter method or an evaporation method.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 illustrates a decoration element of the present specification.

(2) FIG. 2 illustrates a decoration element of the present specification.

(3) FIG. 3 illustrates a decoration element of the present specification, and left and right views.

(4) FIG. 4 illustrates a method for preparing a decoration element of the present specification.

(5) FIG. 5 shows a visual evaluation result of dichroism of Example 1.

(6) FIG. 6 illustrates a lamination structure of a decoration element according to one embodiment of the present specification.

(7) FIGS. 7 to 9 illustrate an upper surface structure of a light absorbing layer of a decoration element.

(8) FIGS. 10 to 14 are examples of a surface of a convex portion or concave portion shape of a pattern layer according to several embodiments.

(9) FIGS. 15 and 16 show results of observing structures and colors of decoration elements of Examples 5 to 7.

(10) FIGS. 17 and 18 show experimental results according to Evaluation Example 2.

(11) FIG. 19 is a graph presenting n and k values of aluminum oxynitride.

(12) FIGS. 20 and 21 are diagrams introduced for describing a color coordinate system.

(13) FIG. 22 is a diagram introduced for describing a light absorbing layer and a light reflective layer.

(14) Three numbers shown in the color of FIG. 16 are L*ab coordinate values of the color.

MODE FOR DISCLOSURE

(15) Hereinafter, the present application will be specifically described with reference to examples, however, the scope of the present application is not limited by the following examples.

Example 1

(16) A hard mold was processed so as to have a pattern of a structure of FIG. 1. A pattern layer having a structure of FIG. 1 was formed by coating a composition comprising an epoxy resin and a phthalocyanine-based dye on a substrate layer, compressing the hard mold and then curing with ultraviolet rays. A decoration element was prepared by depositing aluminum to a thickness of 200 nm on the top of the pattern layer using a sputter method to form an inorganic material layer. A refractive index of the inorganic material layer for light having a wavelength of 400 nm was 5. In the prepared decoration element, both inclined angles of a first convex portion were each 20 degrees and 70 degrees and the width was 30 μm, and both inclined angles of a second convex portion were each 20 degrees and 70 degrees and the width was 5 μm. Heights of the first and the second convex portions were each determined from the width and the inclined angle.

Example 2

(17) A decoration element was prepared in the same manner as in Example 1 except that soft and hard molds were processed so as to have a pattern of a structure and of FIG. 2. In the prepared decoration element, both inclined angles of a convex portion were each 20 degrees and 70 degrees and the width was 30 μm, and both inclined angles of a concave portion were each 20 degrees and 70 degrees and the height was 3 μm. A height of the convex portion was determined from the width and the inclined angle, and a width of the concave portion was determined from the height and the inclined angle.

Example 3

(18) A decoration element was prepared in the same manner as in Example 1 except that soft and hard molds were processed so as to have a pattern of a structure and of FIG. 3. In the prepared decoration element, both inclined angles of a first convex portion of a convex portion of a first area were each 20 degrees and 70 degrees and the width was 30 μm, and a convex portion of a second area had an inversed structure of 180 degrees with the convex portion of the first area, and both inclined angles were each 70 degrees and 20 degrees.

Example 4

(19) A decoration element was prepared in the manner of FIG. 4 using a sputter method. A pattern layer was prepared in the same manner as in Example 1, and a first inorganic material layer was formed by depositing molybdenum to a thickness of 100 nm by tilting toward a first inclined surface of the pattern layer, and then a second inorganic material layer was formed by depositing aluminum to a thickness of 300 nm by tilting toward a second inclined surface.

Examples 5 to 7

(20) After forming a pattern (FIG. 12) by coating an ultraviolet curable resin on a PET substrate layer, an AlO.sub.xN.sub.y (0≤x, 0.1≤y≤1) light absorbing layer was formed on the pattern of the substrate using a reactive sputtering method by adding nitrogen. On the light absorbing layer, Al having a thickness of 100 nm was deposited using a sputtering method to form a light reflective layer (Al, thickness 120 nm).

(21) The pattern shape was formed in a structure repeating an asymmetric prism structure as in FIG. 15, and a sample was prepared by employing an inclined angle on one side surface of the pattern as 60°, and an inclined angle on the other side as 40° (Example 5), 30° (Example 6) and 20° (Example 7). Herein, a pitch of the patterns was 100 micrometers, and a height of the pattern was 25 micrometers. Light entered to the substrate side of the obtained sample, passed through the light absorbing layer, and light reflected on the light reflective layer may be observed from the substrate side. The thickness and the color of the light absorbing layer observed from the obtained sample are shown in FIG. 16. n and k values of the aluminum oxynitride layer are described in FIG. 19.

Comparative Example 1

(22) After forming a pattern (FIG. 12) by coating an ultraviolet curable resin on a PET substrate layer, an AlO.sub.xN.sub.y (0≤x, 0.1≤y≤1) light absorbing layer was formed on the pattern of the substrate using a reactive sputtering method by adding nitrogen. On the light absorbing layer, Al having a thickness of 100 nm was deposited using a sputtering method to form a light reflective layer (Al, thickness 120 nm).

(23) The pattern shape was formed in a structure repeating a symmetric prism structure, and an inclined angle on one side surface of the pattern was 45°, and an inclined angle on the other side was the same as 45°. Herein, a pitch of the patterns was 100 micrometers, and a height of the pattern was 25 micrometers. Light entered to the substrate side of the obtained sample, passed through the light absorbing layer, and light reflected on the light reflective layer may be observed from the substrate side.

Evaluation Example 1 Visual Evaluation of Dichroism

(24) A visual evaluation of dichroism was performed for Examples 1 to 4 and Comparative Example 1 using a visual examination method. FIG. 5(a) and FIG. 5(b) are each an image of a right side view and a left side view of Example 1.

Evaluation Example 2 Visual Evaluation of Dichroism

(25) FIG. 15 shows viewing angle-dependent color changes in the decoration element according to Example 1 and the decoration element according to Comparative Example 1.

(26) It was identified that, whereas the decoration element according to Example 1 exhibited dichroism expressing different colors depending on a viewing angle, the decoration element according to Comparative Example 1 expressed just one color.

(27) FIG. 16 measures and compares brightness values (L*), color values (*a) and saturation values (*b) of the decoration element according to Example 1 and the decoration element according to Comparative Example 1 in CIE L*a*b color space depending on a viewing angle.

(28) In Example 1, it was identified that the brightness value (L*) and the saturation value (*b) significantly changed as the viewing angle changed.

(29) Meanwhile, in Comparative Example 1, it was identified that the brightness value (L*) and the saturation value (*b) did not significantly change even when the viewing angle changed.

(30) In the drawing, the color when looking at the decoration element in a viewing angle coordinate system is presented. The coordinate may be represented by (θ, φ). When employing a direction perpendicular to a surface direction of the decoration element as an x axis, and any one direction of the surface direction of the decoration element as an y axis, an angle formed by the x axis and the viewing direction is referred to as θ, and an angle formed by the y axis and the viewing direction is referred to as φ. When the φ is 0 degrees (θ, 0), L*, a* and b* values depending on the changes in the θ were measured. Details on the viewing angle coordinate system may be referred to a document IES type B Reference [IES-LM-75-01 Goniophotometer Types and Photometric Coordinates(title), IES(author), (Illuminating Engineering Society of North America, 2001)], and this is illustrated in FIG. 20.

(31) In addition, the color of the decoration element is presented when θ and φ both changed. FIG. 21 presents an angle of the viewing angle coordinate system.

(32) [Reference Numeral]

(33) P1: Convex Portion or First Convex Portion P2: Second Convex Portion P3: Concave Portion, P4: Third Convex Portion 10: Pattern Layer 201: First Inorganic Material Layer 202: Second Inorganic Material Layer H1, H2, H3: Height W1, W2, W3: Width, S1, S2, S3, S4, S5, S6: Inclined Surface, a1, a4, a7: Vertex Angle, a2, a3, a5, a6, a8, a9: Inclined Angle C1: First Area C2: Second Area