Patent ID: 11932001
Assignee: LG CHEM, LTD.
Field: Other consumer goods (Other fields)
Classification: CPC A  B  G | IPC A  B  G

Claim 0:
1. 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 a 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 α 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
     
     ]
    
   
  
 

 
  
   
    
     
      
       
        ❘
        "\[LeftBracketingBar]"
       
       
        
         dL
         (
         α
         )
        
        
         d
         ⁢
         α
        
       
       
        ❘
        "\[RightBracketingBar]"
       
      
      ×
      
       
        {
        
         L
         ⁡
         (
         α
         )
        
        }
       
       
        -
        1
       
      
     
     ≤
     0.001
    
   
   
    
     [
     
      Equation
      ⁢
         
      A
     
     ]
    
   
  
 

 
  
   
    
     
      M
      i
     
     =
     
      
       
        ∫
        
         α
         
          i
          ⁢
          1
         
        
        
         α
         
          i
          ⁢
          2
         
        
       
       
        
         L
         ⁡
         (
         α
         )
        
        ⁢
        d
        ⁢
        α
       
      
      
       
        α
        
         i
         ⁢
         2
        
       
       -
       
        α
        
         i
         ⁢
         1
        
       
      
     
    
   
   
    
     [
     
      Equation
      ⁢
         
      B
     
     ]
    
   
  
 

in Equation 1 above,, the 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,, ❘
   "\[LeftBracketingBar]"
  
  
   
    dL
    (
    α
    )
   
   
    d
    ⁢
    α
   
  
  
   ❘
   "\[RightBracketingBar]", means an absolute value of a slope of the brightness value L(α) for the angle α,
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.