A thermoplastic resin composition comprising a thermoplastic resin containing no halogen atom, from 0. The slurry is allowed to set so as to form a board. First and second speaker components are mounted within the speaker frame, on opposing sides of the speaker inner surface. In this way, the structure of a roller press having roller centering is simplified and can be produced more cost-effectively. The constant current may also be cut off in the standby state, in which printing is not performed, so as to reduce power consumption. The protrusion structure is disposed on the inner surface of the complex plate.