Decoration member

A decoration member comprising:

• a substrate;
• and
• a decoration layer provided on the substrate,
• wherein a brightness value L* on a CIE L*ab color coordinate is measured with respect to one point A1 on a circumference of any circle on the surface of the decoration layer by using a detector positioned at a (r, θ, φ) location of a spatial coordinate system having a center point of the surface of the decoration layer as an original point under a standard light source condition of D65 at a wavelength of 380 nm≤λ≤780 nm,
• the spatial coordinate system includes an x axis in any one direction on the surface of the decoration layer, a y axis in another direction on the surface of the decoration layer perpendicular to the x axis, and a z axis in a normal direction to the surface of the decoration layer,
• when a graph having an angle α formed between a straight line linking one point A1 on the circumference of the any circle and a center A0 of the any circle and a positive direction of the x axis as a horizontal axis and the measured brightness value L* as a vertical axis is graph G1,
• in a range in which a of the graph G1 is 0 to 360°, the number n of consecutive intervals in which a length of the horizontal axis satisfying Equation A below is equal to or larger than 10° is 2 or more, and
• there are one or more combinations of θ and φ in which a contrast parameter Cn represented by Equation 1 below is equal to or more than 0.1:
• C
• n
• =
• ∑
• i
• =
• 1
• n
• -
• 1
• ⁢
• 4
• ×
• (
• M
• i
• -
• M
• i
• +
• 1
• M
• i
• +
• M
• i
• +
• 1
• )
• 2
• +
• 4
• ⁢
• δ
• n
• ×
• (
• M
• n
• -
• M
• 1
• M
• n
• +
• M
• 1
• )
• 2
• [
• Equation
• ⁢
• ⁢
• 1
• ]
• 
• dL
• ⁡
• (
• α
• )
• d
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• α
• 
• ×
• {
• L
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• }
• -
• 1
• ≤
• 0.001
• [
• Equation
• ⁢
• ⁢
• A
• ]
• M
• i
• =
• ∫
• α
• i
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• 1
• α
• i
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• 2
• ⁢
• L
• ⁡
• (
• α
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• α
• α
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• 2
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• i
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• 1
• [
• Equation
• ⁢
• ⁢
• B
• ]
• in Equation 1 above,
• Mi means an average value of L(α) of consecutive i-th intervals Si in which the length of the horizontal axis satisfying Equation A above is 10° or more which is shown when α of the horizontal axis of the graph G1 increases and is represented by Equation B above,
• n represents an integer of 2 or more,
• when n is 2, δn is 0,
• when n is 3 or more, δn is 1,
• in Equations A and B, L(α) represents the brightness value L* on the CIE L*ab color coordinate according to the angle α formed between the straight line linking one point A1 on the circumference of the any circle and the center A0 of the any circle and the positive direction of the x axis,
• 
• dL
• ⁡
• (
• α
• )
• d
• ⁢
• ⁢
• α
• 
• means an absolute value of a slope of the brightness value L(α) for the angle α,
• the αi2 represents a largest α value of the consecutive i-th intervals Si in which the length of the horizontal axis satisfying Equation A above is 10° or more and the αi1 represents a smallest α value of the consecutive i-th intervals Si in which the length of the horizontal axis satisfying Equation A above is 10° or more,
• r of the spatial coordinate system as a distance between the detector and the original point of the spatial coordinate system is 200 mm,
• θ of the spatial coordinate system as an angle formed between a straight line passing through the detector and the original point of the spatial coordinate system and the z axis of the positive direction is in the range of 0 to 360°,
• φ of the spatial coordinate system as an angle formed between the straight line passing through the detector and the original point of the spatial coordinate system and the x axis of the positive direction is in the range of 0 to 360°, and
• a diameter of the any circle is 0.8 times a uniaxial length of the surface of the decoration layer.