Patent ID: 11960157
Assignee: ESSILOR INTERNATIONAL
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 4:
5. The variable optical transmission device of claim 4, wherein the circuitry is configured to control an optical transmission value such that the optical transmission value varies according to:

τV(ti+t)=τV(ti)+ƒτV(ti),τV,target(t),

wherein τV(ti) is the initial transmission value at a time t=ti,
τV(ti+t) is a current transmission value at a time ti+t, and ƒτV(ti),τV,target(t) is a transition function depending on the initial transmission value τV(ti) and the target transmission value τV,target defined such that:, {
  
    
      
        
          
            
              
                f
                
                  
                    
                      τ
                      V
                    
                    ⁡
                    
                      (
                      
                        t
                        i
                      
                      )
                    
                  
                  ,
                  
                    τ
                    
                      V
                      ,
                      target
                    
                  
                
              
              ⁡
              
                (
                0
                )
              
            
            =
            0
          
        
      
      
        
          
            
              
                lim
                
                  t
                  →
                  
                    +
                    ∞
                  
                
              
              ⁢
              
                
                  f
                  
                    
                      
                        τ
                        V
                      
                      ⁡
                      
                        (
                        
                          t
                          i
                        
                        )
                      
                    
                    ,
                    
                      τ
                      
                        V
                        ,
                        target
                      
                    
                  
                
                ⁡
                
                  (
                  t
                  )
                
              
            
            =
            
              
                τ
                
                  V
                  ,
                  target
                
              
              -
              
                
                  τ
                  V
                
                ⁡
                
                  (
                  
                    t
                    i
                  
                  ), in absence of a detection of a change of illuminance after t=ti,
the transition function having a total transition duration defined by a time interval during which the transition function reaches a transmission value of 0.95(τV,target−τV(ti)), and
wherein the response duration comprises the total transition duration.