Apparatus for playing back rotating recording mediums

摘要

A rotating recording medium such as a video disc placed on a turntable is played back by a signal pickup head movable radially over and across the disc. The disc is removably housed in a disc case composed of a jacket for containing the disc and a lid plate closing a slot in the jacket. When the disc case is inserted, it pushes a jacket opener over and across the turntable while the slot is opened by the jacket opener for removal of the disc. When the disc playback apparatus is not in operation or the disc is being played back, the jacket opener is firmly locked by a locking mechanism against movement into the apparatus, so that forced entry of a disc case into the apparatus is prevented. Since the jacket opener is locked at laterally spaced positions by the locking mechanism, the jacket opener is rigidly kept in the locked position against the operator's undue attempts to insert the disc case.