In a disk player, an optical pickup unit which is supported by guide shafts installed on a base recordsreproduces information by emitting a optical beam onto a disk while moving along the guide shafts. The die is coupled to the leadframe such that its back surface is coplanar with source leads and a gate lead extending from the leadframe. For an add operation, information is first added to an \u2018out\u2019 table used to retrieve objects before the database is actually updated. The combustion chamber serves to eliminate explosive and flammable elements contained in an incoming gas.