Patent ID: 11960110
Assignee: CANON KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The optical filter according to claim 2, wherein the following condition is satisfied:, 8
   [
   nm
    
   ]
  
  ≤
  
   
    
     ∑
      
    
    
     j
     =
     1
    
    m
   
   ⁢
   kj
   ×
   dj
  
  ≤
  
   13
   ⁢
   
    2
    [
    nm
     
    ]
   
  
 

where m represents a number of films constituting the absorption layer, kj represents an extinction coefficient of a j-th film counted from the substrate side among the m films at the wavelength of 550 nm, dj [nm] represents a physical film thickness of the j-th film.