	US 7,555,763 B2
	Disk cartridge
Kazuhito Kurita, Kanagawa (Japan); Mikinori Matsuda, Kanagawa (Japan); Takahiro Yamada, Saitama (Japan); Tokio Kanada, Kanagawa (Japan); and Takashi Fukushima, Tokyo (Japan)
Assigned to Sony Corporation, Tokyo (Japan)
Appl. No. 10/528,112 PCT Filed Jul. 23, 2004, PCT No. PCT/JP2004/010516 § 371(c)(1), (2), (4) Date Mar. 16, 2005, PCT Pub. No. WO2005/010886, PCT Pub. Date Feb. 03, 2005.
Claims priority of application No. P2003-281389 (JP), filed on Jul. 28, 2003; application No. P2003-281392 (JP), filed on Jul. 28, 2003; application No. P2004-140473 (JP), filed on May 10, 2004; and application No. P2004-140498 (JP), filed on May 10, 2004.
Prior Publication US 2006/0123442 A1, Jun. 08, 2006
Int. Cl. G11B 23/03 (2006.01)

U.S. Cl. 720—725

8 Claims

1. A disc cartridge comprising:

a disc; and

a main cartridge body unit including an upper cartridge portion and a lower cartridge portion, the main cartridge body unit having said disc rotatably housed therein and including:

a recording and/or reproducing aperture formed into the lower cartridge portion that exposes a portion of said disc to outside across inner and outer rims of said disc, the recording and/or reproducing aperture defining a first side of the lower cartridge portion and a second side of the lower cartridge portion, and

an entrance part for a head unit of a recording and/or reproducing apparatus, said entrance part being a recess which is formed in the first side of the lower cartridge portion and extending to said recording and/or reproducing aperture, for entrance of at least a portion of said head unit below an outer surface of the lower cartridge portion,

wherein a lateral surface of said entrance part for said head unit is an inclined surface for inhibiting abutment against said head part, and

wherein a depth of said entrance part is less than a thickness of the first side of the lower cartridge portion so as to not expose another portion of the disc located adjacent to the recess to the outside.