Patent ID: 11970389
Assignee: HAMAMATSU PHOTONICS K.K.
Field: Optics (Instruments)
Classification: CPC B  G | IPC B  G

Claim 0:
1. An actuator device comprising:
a support portion;
a first movable portion;
a second movable portion that has a frame shape and surrounds the first movable portion;
a first connection portion that connects the first movable portion and the second movable portion to each other such that the first movable portion is swingable around a first axis;
a second connection portion that connects the second movable portion and the support portion to each other such that the first movable portion is swingable around the first axis by vibrating the second movable portion; and
a drive unit that applies a drive force to the second movable portion,
wherein two natural angular frequencies ω1 and ω2 (where ω1<ω2) for vibration of the first movable portion and the second movable portion around the first axis satisfy one of the following first equation (1) and second equation (2) and do not satisfy the other,, [
  
   Equation
   ⁢
      
   1
  
  ]
 

 
  
   
    
     0
     <
     
      1
      -
      
       
        (
        
         
          ω
          1
         
         
          ω
          ii
         
        
        )
       
       2
      
     
     ≤
     0.2
    
   
   
    
     (
     1
     )
    
   
  
 

 
  [
  
   Equation
   ⁢
      
   2
  
  ]
 

 
  
   
    
     0
     <
     
      
       
        (
        
         
          ω
          2
         
         
          ω
          ii
         
        
        )
       
       2
      
      -
      1
     
     ≤
     
      0
      .
      2
     
    
   
   
    
     (
     2
     )
    
   
  
 

where in the above equations, ωii=(ki/ji)1/2, ki is a torsional spring constant of the first connection portion around the first axis, and ji is an inertia moment of the first movable portion around the first axis.