Wire-free sensing apparatus for disc system

A wire-free sensing apparatus for a disc system, said disc system comprising a case and a drawer, said drawer being for adopting a data storage device and slidably received within said case, said wire-free sensing apparatus comprising:

• a beam emitting source, installed at a rear end of said case for emitting a beam;
• a reflector, installed at a front end of said drawer for reflecting said beam, and being movable to a straight emitting direction of said beam;
• a beam receiving end, installed at said case, being depart from said straight emitting direction of said beam for selectively receiving said beam reflected by said reflector;
• a switch, installed at said drawer for controlling whether said reflector reflects said beam or not, when said switch is at a KEY ON status, said reflector reflects said beam, and when said switch is at a KEY OFF status, said reflector does not reflects said beam;
• and
• a one-way mirror, installed at said case and positioned under said beam receiving end, and between said beam emitting source and said reflector, said one-way mirror forming an approximately 45 degree angle with the straight emitting direction of said beam, said one-way mirror comprising a penetrating surface at one side thereof facing said beam emitting source and a reflecting surface at the opposite side thereof facing said reflector, said penetrating surface being parallel to said reflecting surface;
• wherein when said switch at the KEY ON status, said beam penetrates said penetrating surface to said reflector, and is then reflected by said reflector in an opposite direction of said straight emitting direction of said beam to said reflecting surface and thereafter is perpendicularly deflected by said reflecting surface to said beam receiving end;
• whereby said disc system can judge whether said drawer is properly received within said case in determining whether said beam receiving end receives said beam.