Fitzpatrick, Cella, Harper & Scinto
Deflection scanning apparatus having balance control
 In a deflection scanning apparatus used for a laser beam printer or the like, a rotating body is provided with a deflector which has a plurality of recesses arranged in a concentric manner with the center at the rotation axis of the rotating body. Balance weights are set in the recesses so as to remove rotation unbalance in rotation of the rotating body. 
Canon Kabushiki Kaisha
G G
G02B G02B
inventional inventional
Yasuo
Suzuki