Patent ID: 11860526
Assignee: BEIJING ASU TECH CO. LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. The projection system of claim 8, the light source apparatus further comprises a first focusing lens module and a second focusing lens module, respectively arranged between the first dichroic filter and the first fluorescence plate and between the second dichroic filter and the second fluorescence plate, wherein each of the first focusing lens module and the second focusing lens module comprises, along a light transmission direction, a first focusing lens sub-module and a second focusing lens sub-module, respectively comprising an aspheric lens and a spherical lens, wherein:
an aspheric surface of the aspheric lens is expressed as:, z
    =
    
      
        
          c
          ⁢
          
            ρ
            2
          
        
        
          1
          +
          
            
              1
              -
              
                
                  (
                  
                    1
                    +
                    k
                  
                  )
                
                ⁢
                
                  c
                  2
                
                ⁢
                
                  ρ
                  2
                
              
            
          
        
      
      +
      
        Σ
        ⁢
        
          A
          n
        
        ⁢
        
          ρ
          
            2
            ⁢
            n
          
        
      
    
  
  ;

where c is a curvature at a sphere vertex, k is a coefficient of an aspherical surface of a quadratic term, An is a coefficient of the aspherical surface of a higher-order term, n is taken as 2-7, and r is a normalized radial coordinate.