Patent ID: 7162725

Claim:
In an disc player having a chassis ( 4 ), a disc insertion slot ( 8 ) formed on the chassis for selectively inserting one of a large and a small size disc (D 1 , D 2 ), a turntable ( 5 ) disposed for rotating on the chassis, a disc insertion path along which the disc is to be passed toward the turntable, a clamper ( 6 ) for holding the disc on the turntable, and a clamper support ( 7 ) for supporting the clamper, a disc centering device comprising: paired left and right disc sensor members ( 11 , 12 ) disposed on the chassis and each having one end and the other end; sensor portions ( 11 a , 12 a ) each provided on said one end of each of the disc sensor members and leading portions ( 11 d , 12 d ) provided on said other end of each of the disc sensor members; a movable member ( 19 ) for being moved in the disc inserting direction to an extent corresponding to the diameter of the disc in an interlocked relation to the one ( 12 ) of the disc sensor members; a trigger member ( 20 ) supported for rocking on the movable member; a disc stopper for the large size disc (D 2 ) provided on the trigger member; and a chassis portion ( 4 a ) formed on the chassis ( 4 ) and capable of becoming in contact with the trigger member; whereby: as the result of rocking of the trigger member pushed by the outer edge of the disc, said clamper is engaged into the center hole of the disc thereby to effect a disc centering operation; when inserting the small size disc (D 1 ) from the disc insertion slot ( 8 ), the disc sensor members undergo synchronous rocking to each other as the sensor portions are pushed by the disc; as soon as the center of the small size disc passes between the two sensor portions, the lateral deviation of the small size disc is corrected by the leading portions of the disc sensor members; when inserting the large size disc (D 2 ) from the disc insertion slot, the disc sensor members undergo synchronous rocking to each other to an increased extent compared to the case of inserting the small size disc as the sensor portions are pushed by the disc; with the rocking of the disc sensor members to the increased extent compared to the case of inserting the small size disc, the two leading portions are caused to escape from the disc insertion path along which the large size disc is to be passed, while the trigger member is brought into contact with the chassis portion ( 4 a ) for limiting the extent of insertion of the large size disc with the trigger member and the disc stopper ( 4 b ) for the large size disc; and at the time of the small size disc insertion, with the displacement of the movable member the trigger member is brought into contact with a clamper support ( 7 ) supporting the clamper for limiting the extent of insertion of the small size disc with the trigger member and the leading portion ( 11 d ) of the other sensor member ( 11 ).