Patent ID: 11923213
Assignee: SEMES CO., LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B  G | IPC B  G  H

Claim 9:
10. The substrate heating unit of claim 8,
wherein the first movable lens array and the second movable lens array are controlled such that the first movable lens array is positioned at one of a first position that satisfies an equation 1, and a second position that does not satisfy the equation 1,
wherein the equation 1 is expressed as, d
    
     1
     ⁢
     2
    
   
   =
   
    
     
      f
      2
     
     (
     
      
       f
       3
      
      -
      
       d
       
        2
        ⁢
        3
       
      
     
     )
    
    
     
      f
      2
     
     +
     
      f
      3
     
     -
     
      d
      
       2
       ⁢
       3
      
     
    
   
  
  ,
 

 where d12 is a distance between the first lens array and the first movable lens array, f2 is a focal length of the first movable lens array, and f3 is a focal length of the second movable lens array, and
wherein the second movable lens array is positioned at one of a third position that satisfies an equation 2, and a fourth position that does not satisfy the equation 2, and
wherein the equation 2 is expressed as, d
    
     2
     ⁢
     3
    
   
   =
   
    
     
      
       f
       2
      
      ⁢
      
       f
       3
      
     
     -
     
      
       d
       
        1
        ⁢
        2
       
      
      (
      
       
        f
        2
       
       +
       
        f
        3
       
      
      )
     
    
    
     
      f
      2
     
     -
     
      d
      
       1
       ⁢
       2
      
     
    
   
  
  ,
 

 where d23 is a distance between the first movable lens array and the second movable lens array.