Optical disc cartridge and mechanism for preventing an incorrect insertion of a cartridge

An optical disc cartridge for use with a data handling apparatus comprising:

• a case having an aperture and an optical disc operatively arranged therein;
• a shutter slidably associated with said case for selectively opening said aperture to expose said disc to handle data thereon, wherein said shutter is contacted and slid open by a shutter opening lever provided in said data handling apparatus when said cartridge is inserted into said data handling apparatus;
• a cut-off portion provided only at a head and left side corner of said case as viewed looking down on said case in a direction of insertion of said cartridge into said data handling apparatus;
• a shutter opening lever receiving portion provided at a head side of said case at a right side of said shutter when said shutter is closed as viewed looking down on said case in the insertion direction;
• and
• a depression provided only at the head side of said case to the left of a center line of said case as viewed looking down on said case in said insertion direction such that an edge of said depression is symmetric about said center line with respect to the right side of said shutter when said shutter is closed as viewed looking down on said case in the insertion direction.

An optical disc cartridge for use with a data reproducing apparatus comprising:

• a case having an aperture and an optical disc operatively arranged therein;
• a shutter slidably associated with said case for selectively opening said aperture to expose said disc to reproduce data thereon;
• a cut-off portion provided only at a head and left side corner of said case as viewed looking down on said case in a direction of insertion of said cartridge into said data reproducing apparatus;
• a shutter opening lever receiving portion provided at a head side of said case at a right edge of said shutter when said shutter is closed as viewed looking down on said case in the insertion direction;
• and
• a notch provided only at the head side of said case to the left of a center line of said case between said cut-off portion and a left side of said shutter when said shutter is closed as viewed looking down on said case in the insertion direction such that an edge of said notch is symmetric about said center line with respect to the right edge of said shutter when said shutter is closed as viewed looking down on said case in the insertion direction;
• wherein a shutter opening lever provided in said data reproducing apparatus contacts the head side of said case and the right edge of said shutter at said shutter opening lever receiving portion and slides said shutter open when said optical disc cartridge is correctly inserted into said data reproducing apparatus, and wherein said notch engages said shutter opening lever and stops movement of said shutter opening lever when said optical disc cartridge is incorrectly inserted into said data reproducing apparatus.