Patent ID: 8753239

Claim:
A power transmission device, comprising: an electromagnetic wave-shielding wall partitioning a first space and a second space adjacent to said first space and blocking propagation of an electromagnetic wave between said first space and said second space; a first pulley arranged within said first space; a second pulley arranged within said second space; a belt placed on said first pulley and said second pulley and extending through said electromagnetic wave-shielding wall to transmit rotational driving force between said first space and said second space; and a removable part, said removable part being arranged in a hole in a portion of said electromagnetic wave-shielding wall, said belt extending through said hole, and said hole being of a size corresponding to a size of said second pulley to allow said second pulley and said belt to pass through the hole when the removable part is removed, from said electromagnetic wave-shielding wall a hollow tubular member being protruded and allowing said first space and said second space to communicate with each other, wherein said belt extends through an inside of said tubular member, and said tubular member is fixed to said removable part.