Patent ID: 7673311
Filing Date: 2010-03-02
Classification: G11B

Abstract:
1. A disc cartridge comprising: a cartridge body including a disc storage portion having a disc window, and a bottom and a sidewall along an outer periphery of the bottom, and storing a disc with first and second sides in a rotatable state so that the first side is exposed through the disc window, a chucking opening provided on the bottom of the disc storage portion so as to get the disc chucked externally and a head opening provided on the bottom of the disc storage portion so as to allow a signal read/write head to access the second side of the disc; a first shutter and a second shutter, which are provided on the bottom of the disc storage portion so as to expose or cover the head opening; a first disc holding portion and a second disc holding portion provided at the first shutter and the second shutter, respectively, and a rotational member supported over, and engaging with, the first and second shutters in the disc storage portion so as to open or close the first and second shutters when rotating in the disc storage portion, wherein the rotational member includes: a disc receiving portion with a contact region that contacts with, and receives, the outer edge of the second side of the disc while the first and second shutters are closed; a groove provided outside of the contact region; a plurality of filling portions, which are provided to fill in parts of the groove, the upper surface of each said filling portion being tilted toward the center of the disc window; and a notch, which is provided for the disc receiving portion to be located within the head opening while the first and second shutters are opened, wherein the first disc holding portion and the second disc holding portion hold the disc thereon with the center of the disc offset from the center of the disc storage portion such that an outer side surface of the disc contacts with the sidewall of the disc storage portion at a position where the notch of the rotational member is located while the first and second shutters are closed.