| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical information recording medium which can be manufactured in existing facilities for manufacturing a CD with a diameter of 120 mm, and has a card type CD which can be placed on a drive table for a CD with a diameter of 80 mm to perform reproduction. SOLUTION: In the optical information recording medium, a ring with an outer diameter of 120 mm is disposed outside the card type CD being a product, and these are connected with a runner and a gate. A level difference is provided on the border of a straight line connecting two points of ends distant from the center of a drive hole by 40 mm, and the card type CD can be set in matching with the recess of a player. |
