US 6,665,139 B2 · Magnetic-disc unit with gap between disc and shroud

Abstract

In a magnetic disc apparatus including a plurality of magnetic discs mounted on a spindle, arms supporting magnetic heads, a rotary actuator for the arms, and a housing having an arcuate-shaped shroud, the improvement wherein gaps between the shroud and the sides of outer peripheries of the magnetic discs are larger than 0.1 mm and less than 0.6 mm. An open space is located, downstream of the arms with respect to the air flow on surfaces of the magnetic discs, the open space being devoid of the shroud. An opening is provided in the shroud, upstream of the arms with respect to the air flow and having a greater width than a width of the gaps defined between the magnetic discs and the shroud, and a bypass channel is provided which communicates between the opening and open space.

Claims26

Dependent claims

In a magnetic disc apparatus including a plurality of magnetic discs mounted on a spindle, arms supporting thereon magnetic heads and held on surfaces of said magnetic discs, a rotary actuator for moving said arms, and a housing having an arcuate-shaped shroud, which is concentric with said magnetic discs to surround sides of said magnetic discs so as to permit movement of said arms,

the improvement wherein gaps between said shroud and the sides of outer peripheries of said magnetic discs are larger than 0.1 mm and less than 0.6 mm, and
wherein an open space is located, downstream of said arms, with respect to an air flow which is generated by revolution of said magnetic discs on surfaces of said magnetic discs, said open space being devoid of said shroud.

Dependencies are inferred from the claim text.

Facts

Application

10/022,260Filed 20 Dec 2001 · continuation in part

Priority

JP 10-03085313 Feb 1998

Published

US 2002/0030924 A120 Jun 2002

Granted

16 Dec 2003

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

G11B 33/08
Cabinets; Cases; Stands; Disposition of apparatus therein or thereon: insulation or absorption of undesired vibrations or sounds
G11B 5/6005
Fluid-dynamic spacing of heads from record-carriers: specially adapted for spacing from a rotating disc using a fluid cushion
G11B 25/043
Using flat record carriers, e.g. disc, card: using rotating discs
G11B 33/1446
Reducing influence of physical parameters, e.g. temperature change, moisture, dust: reducing contamination, e.g. by dust, debris

Family

Application09/247,550Parent of this continuation-in-part · filed 10 Feb 1999

Application09/356,056Parent of this continuation-in-part · filed 16 Jul 1999

US 2002/0075592 A1Pre-grant publication · published 20 Jun 2002

US 6,369,978 B1Parent of this continuation-in-part

US 2002/0030924 A1Published application

US 6,751,050 B1Related patent

US 6,665,139 B2This patent

From the US filing history. Foreign family members aren’t listed.

Magnetic-disc unit with gap between disc and shroud

Life of this patent

Magnetic-disc unit with gap between disc and shroud

Life of this patent

Abstract

Claims26