Sony Corporation

Mitsuyoshi Kawaguchi

Manabu Obata

Yuji Iwaki

Naoki Inoue

Shuichi Kikuchi

Teiko Hoshi

Takao Abe

Fumiaki Henmi

Mitsunori Matsumura

Takashi Sasaya

Takuji Nakamura

Hiroaki Mizuma

The present invention is related to a disc cartridge in which an optical disc, an inner shell and shutter members are housed in a main cartridge body unit, formed by abutting and combining upper and lower shells and in which the inner shell is run in rotation to cause the shutter members to open or close an aperture provided in the main cartridge body unit. The inner shell is formed by a resin molding portion comprised of a first molded portion for forming the inner shell and a second molded portion connected to the first molded portion. The second molded portion is provided at a position forming the aperture in the inner shell and is connected to the first molded portion through a flanged thin-walled section. The inner shell is formed by severing the second molded portion and the flanged thin-walled section.

Disc cartridge including an inner shell formed by severing a molded portion and a flanged thin-walled section

The present invention relates to a disk cartridge in which a disk-like recording medium such as an optical disk, a magneto-optical disk and a magnetic disk is accommodated within a disk compartment of a cartridge housing, a disk recording medium device in which the disk-like recording medium is accommodated in advance within the disk compartment so as to become freely rotatable and a disk recording and/or reproducing apparatus for recording and/or reproducing information by using this disk recording medium device. A disk cartridge according to the present invention comprises a cartridge housing in which a disk compartment is formed by combining an upper shell and a lower shell and in which an opening portion is formed on the lower shell and the like and a pair of shutter members provided on the cartridge housing so as to become movable between the opening position at which the opening portion is opened and the closing position at which the opening portion is closed and which has joint portions that are joined to each other at the closing position, wherein a rectangular groove portion and a rib portion that can be engaged with each other are provided on each joint portion of a pair of shutter members over approximately the total length of the joint portion. According to the present invention, a dust-proof property of the joint portions, which are joined to each other, of a pair of shutter members can be enhanced. Thus, it is possible to provide the disk cartridge, the disk recording medium device and the disk recording and/or reproducing apparatus in which dusts, smudges and so on are difficult to enter the disk compartment.

Disk cartridge and disk recording medium device having shutter members

A disc drive unit capable of simply performing an opening and closing driving of shutters by rotation of an inner rotor of a disc cartridge using the inner rotor is provided. A disc drive unit is constituted so as to open and close shutters () by rotationally driving a partial gear () of the inner rotor () by a rack portion () of a rack member () slidably driving it relative to a disc cartridge ().

Disk-drive device

The present invention is relative to a disc cartridge in which an optical disc (), an inner shell () and shutter members (), () are housed in a main cartridge body unit (), formed by abutting and combining upper and lower shells (), (), and in which the inner shell is run in rotation to cause the shutter members (), () to open or close an aperture () provided in the main cartridge body unit (). On an inner side of the peripheral wall sections of the upper and lower shells, abutted to each other, a crank-shaped dust intrusion prohibiting unit (A) is provided for prohibiting intrusion of dust and dirt from the abutting surfaces of the peripheral wall sections of the upper and lower shells towards the optical disc housed in the main cartridge body unit to protect the optical disc housed in the main cartridge body unit. The inner shell provided in the main cartridge body unit includes an aperture () in register with an aperture in the main cartridge body unit, and includes a connecting portion () bridging an open end side of the aperture. This connecting portion has a height not protruding towards the lower shell.

Disc cartridge with crank-shaped dust intrusion prohibiting unit

A method for producing an inner shell used for a disc cartridge in which an optical disc, an inner shell and shutter members are housed in a main cartridge body unit. The inner shell provided in the main cartridge body unit includes a first molded portion, provided with an aperture, a second molded portion having a resin injection port and molded at a position where the aperture is formed, and a flanged thin-walled section connecting the first and second molded portions to each other. The method includes the steps of injecting molten resin into a cavity defined by a fixed metal die and a movable metal die for molding the first molded portion, the second molded portion, and the flanged thin-walled section, and severing the flanged thin-walled section by a punch provided to the movable metal die before the molten resin injected into the cavity is cooled and solidified.

Method for producing inner shell for a disc cartridge

A disk cartridge housing in which a disk compartment is formed by combining an upper shell and a lower shell. The cartridge has an opening portion which overlaps with a shutter member to expose a part of the disk compartment. A convex rib and a concave groove arrangement is used between the opening portion and shutter member to form a dust-proof housing.

Disk cartridge having a dust-proof shutter

Disk cartridge with inner shell supported for rotation in guide groove formed in an upper shell

Disclosed is a disk cartridge capable of preventing the permeation of dust in the disk cartridge. A labyrinth shape portion having a recessed dust deposition portion formed in a gap at a portion between tilt planes for overlap of shutters are vertically overlapped to each other.

Disc cartridge with shutter overlapping gap having labyrinth shaped portion spaced to have a recessed dust deposition portion

In a video tape recorder for recording a video signal having a first field frequency and a video signal a second field frequency, substantial centers,of lengths of recording tracks, on a magnetic tape,, for the video signals having the first and second field frequencies are recorded thereon at the same position.

Growing community of inventors

Kanagawa, Japan

Mitsuyoshi Kawaguchi