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US 5,859,831 AGranted
Disk cartridge
AssigneeSony Corporation
InventorsTakashi Naito, Tamotsu Maeda
Life of this patent
Estimating the term…
Abstract
A disk cartridge has an overwritable magneto-optical disk rotably mounted therein. The overwritable magneto-optical disk cartridge is usable in compatible type disk drives which also accept conventional, non-overwritable, magneto-optical disks. A magnetic initializing device is provided within the cartridge casing such that a sufficient magnetic field may be generated within the cartridge for effecting overwrite operations. Accordingly, no such magnetic initializing device need be provided in a disk drive and a size, weight and cost of such disk drives may be reduced, while cartridge performance may be reliably improved.
Claims9
A disk cartridge comprising:
- a cartridge casing;
- an overwrite type magneto-optical disk rotatably mounted in the cartridge casing;
- and
- magnetic initializing means, including a yoke and magnetic means disposed within the cartridge casing proximate to a radial portion of the overwrite type magneto-optical disk so as to generate a magnetic field sufficient for effecting overwrite operation of the overwrite type magneto-optical disk;
- wherein the yoke of the magnetic initializing means comprises an upper arm and a lower arm arranged such that a radial portion of the overwrite type magneto-optical disk passes between the upper and lower arms of the magnetic initializing means according to rotation thereof;
- and
- wherein the magnetic means comprises a pair of upper initializing magnets disposed in parallel on the inner surface of the upper arm of the yoke and a pair of lower initializing magnets disposed in parallel on the inner surface of the lower arm of the yoke both of the upper and lower pairs of the initializing magnets being arranged in parallel to a radial direction of the disk such that a radial portion of the overwrite type magneto-optical disk passes between the initializing magnets during rotation thereof.
4 more elements
A disk cartridge, comprising:
- a cartridge casing;
- an overwrite type magneto-optical disk rotatable mounted in the cartridge casing;
- and
- magnetic initializing means, including a yoke and magnetic means disposed within the cartridge casing proximate to a radial portion of the overwrite type magneto-optical disk so as to generate a magnetic field sufficient for effecting overwrite operation of the overwrite type magneto-optical disk;
- wherein the yoke of the magnetic initializing means comprises an upper arm and a lower arm arranged such that a radial portion of the overwrite type magneto-optical disk passes between the upper and lower arms of the magnetic initializing means according to rotation thereof;
- and
- wherein the upper and lower arms of the yoke are respectively attached to indentations formed in the material of the cartridge casing at facing upper and lower sides thereof.
4 more elements
A disk cartridge, comprising:
- a cartridge casing;
- an overwrite type magneto-optical disk rotatably mounted in the cartridge casing;
- and
- magnetic initializing means, including a yoke and magnetic means disposed within the cartridge casing proximate to a radial portion of the overwrite type magneto-optical disk so as to generate a magnetic field sufficient for effecting overwrite operation of the overwrite type magneto-optical disk;
- wherein the yoke of the magnetic initializing means comprises an upper arm and a lower arm arranged such that a radial portion of the overwrite type magneto-optical disk passes between the upper and lower arms of the magnetic initializing means according to rotation thereof;
- and
- wherein the upper and lower arms of the yoke are respectively provided with openings therein for attachment to facing upper and lower sides respectively of the cartridge casing via ultrasonic welding.
4 more elements
A disk cartridge, comprising:
- a cartridge casing;
- an overwrite type magneto-optical disk rotatably mounted in the cartridge casing;
- and
- magnetic initializing means, including a yoke and magnetic means disposed within the cartridge casing proximate to a radial portion of the overwrite type magneto-optical disk so as to generate a magnetic field sufficient for effecting overwrite operation of the overwrite type magneto-optical disk;
- wherein the yoke of the magnetic initializing means comprises an upper arm and a lower arm arranged such that a radial portion of the overwrite type magneto-optical disk passes between the upper and lower arms of the magnetic initializing means according to rotation thereof;
- and
- wherein the upper and lower arms of the yoke are respectively affixed to facing upper and lower sides of the cartridge casing via an outsert molding process such that the upper and lower arms are embedded in a material of which the cartridge casing is formed.
4 more elements
A disk cartridge, comprising:
- a cartridge casing;
- an overwrite type magneto-optical disk rotatably mounted in the cartridge casing;
- and
- magnetic initializing means, including a yoke and magnetic means disposed within the cartridge casing proximate to a radial portion of the overwrite type magneto-optical disk so as to generate a magnetic field sufficient for effecting overwrite operation of the overwrite type magneto-optical disk;
- wherein a support portion for supporting a peripheral edge of the overwrite type magneto-optical disk is projected from at least one of facing upper and lower sides of the cartridge casing.
2 more elements
Dependencies are inferred from the claim text.