Optical tape cassette

An optical tape cassette comprising:

• a cassette housing having a front and a bottom, a light-passing window on the front thereof and a center hole in a bottom for providing access into an interior of the cassette housing;
• a drum having an upper portion and a lower portion said drum rotatably mounted within the interior of said cassette housing, said drum having a generally cylindrical periphery about which optical tape is slantingly wound between an optical tape outgoing hole and an optical tape incoming hole which are formed on said cylindrical periphery, said drum having a center boss on said lower portion of said drum which is substantially concentric with and accessible through said center hole, said center boss having an inner and outer diameter;
• a tape supply reel having one end of said tape supported thereby rotatably mounted in said upper portion of said drum for supplying said optical tape through said outgoing hole;
• and
• a tape take-up reel having the other end of said tape supported thereby rotatably mounted in said lower portion of said drum for receiving said optical tape through said incoming hole, said take-up reel having a hub which is substantially concentric with and accessible through said center hole, said hub having an inner diameter greater than said inner diameter of said center boss,
• whereby said boss and said hub are connectable to first and second external rotating members respectively through said center hole.