Patent ID: 6480354
Filing Date: 2002-11-12
Classification: G11B

Abstract:
A door opening and closing mechanism adapted for a disk cartridge for opening and closing a rotating door attached to an opening portion of the disk cartridge, said door opening and closing mechanism comprising:an engaging pin adapted for engaging with at least one side face of said rotating door to rotate said rotating door and open said opening portion with said engaging pin moving on a predetermined track in accordance with advancing of said disk cartridge, said engaging pin being movably provided for a side wall opposed to a side face of the disk cartridge; urging means for urging said engaging pin, said urging means allowing said rotating door to be opened by moving said engaging pin against its urging force and allowing said rotating door to be closed by returning said engaging pin to a predetermined position; and a projected streak portion adapted for determining opening or closing of said rotating door, said projected streak portion entering in a notch installed in said rotating door only when the rotating door rotates to reach a predetermined rotational angle, wherein said projected streak portion is formed continuously over a predetermined length, and wherein while said inserted disk cartridge advances and reaches a second predetermined position after opening the rotating door, the closing of the rotating door is hampered by bringing said projected streak portion entered in said notch into contact with said notch of said rotating door.