Patent ID: 11892438
Assignee: ASAHI KASEI MICRODEVICES CORPORATION
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 6:
7. The optical densitometer according to claim 1, wherein a distance between the first optical coupling region and the second optical coupling region is equal to or smaller than a distance given by the following Expression (1):, 3
          ⁢
          
            λ
            0
          
        
        
          2
          ⁢
          π
          ⁢
          
            
              
                n
                coup
                2
              
              -
              
                n
                mid
                2
              
            
          
        
      
    
    
      
        Expression
        ⁢
        
          
        
        ⁢
        
          (
          1
          )
        
      
    
  

where λ0 represents an average wavelength, in vacuum, of the light propagating through the core layer, ncoup represents a refractive index of the material forming the first optical coupling region or the second optical coupling region, and nmid represents a refractive index of a material present in a portion sandwiched between the first optical coupling region and the second optical coupling region.