There &re many factors in this study, especially with the requision 
above mentioned, and they assorted in two items as according to a rough 
guess, namely one of them is the optical problem and another is the 
matter in the mechanism. 
COMPARISON BETWEEN SOME TYPES. 
Purposes of reference, three diagrams and seven photographs were 
p , 8 
  
shown-fron Figel.vtoyvrigel…l- 
Ob ject 
     
  
Light-Soune. 
Sa LT Sh S / 
En) 
Pate 
Pig.l. Scanner schematic Fig.2. Working model: l-type 
  
  
  
  
   
  
  
Fig.3. Il-type Fig.4. Working model; 
the cutting method by 
the plane light beam.