US 2006/0139812 A1Published application

Magnetic disk drive with efficient layout of circuit elements

AssigneeHitachi Global Storage Technologies Netherlands B.V.

InventorsYasuhiro Kotani, Akira Morita, Hiroki Kitahori

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Abstract

Embodiments of the invention provide an efficient layout of circuit elements on a circuit board. A hard disk drive (HDD) according to one embodiment of the present invention is provided with a circuit board. The circuit board has an IC of HDC, MPU, and R/W channel, an IC of MDU, an SPM aperture, and a carriage bearing aperture. The IC is provided on the circuit board on the side where the center of a carriage bearing protrusion is positioned with respect to a central line AB parallel to the short sides of the surface of the housing and on the side opposite to the side where the center of the carriage bearing protrusion is positioned with respect to a central line CD parallel to the long sides of the surface of the housing. The IC of MDU is provided on the circuit board on the side where the center of the carriage bearing protrusion is positioned with respect to the central line CD and at a position between the center of an SPM protrusion and the center of the carriage bearing protrusion in the longitudinal direction of the surface of the housing.

Claims16

Dependent claims

A magnetic disk drive comprising:

a housing having a first rectangular surface and first and second columnar protrusions formed on the first rectangular surface;
and
a circuit board having a first circuit which includes a hard disk controller, an MPU, and a read/write channel, and a second circuit which includes a motor drive unit, and provided with a first columnar aperture and a second columnar aperture;
wherein the center of the first protrusion lies on a short side center line parallel to the short sides of the first surface or at a position deviated from the short side center line,
wherein the center of the second protrusion lies on a long side center line parallel to the long sides of the first surface or at a position deviated from the long side center line on the side opposite to the side where the center of the first protrusion is positioned with respect to the short side center line parallel to the short sides of the first surface,
wherein the circuit board is fixed to the first surface of the housing in a mutually fitted state of the first aperture and the first protrusion and in a mutually fitted state of the second aperture and the second protrusion,
wherein the center of the first circuit lies on the circuit board on the side where the center of the second protrusion is positioned with respect to the short side center line parallel to the short sides of the first surface and on the side opposite to the side where the center of the second protrusion is positioned with respect to the long side center line parallel to the long sides of the first surface, and
wherein the center of the second circuit lies on the circuit board at a position between the center of the first protrusion and the center of the second protrusion in the longitudinal direction of the first surface and on the side where the center of the second protrusion is positioned with respect to the long side center line parallel to the long sides of the first surface.

5 more elements

A magnetic disk drive comprising:

a housing having a first rectangular surface and first and second columnar protrusions formed on the first rectangular surface;
and
a circuit board having a first circular aperture;
wherein the center of the first protrusion lies on a short side center line parallel to the short sides of the first surface or at a position deviated from the short side center line,
wherein the center of the second protrusion lies on a long side center line parallel to the long sides of the first surface or at a position deviated from the long side center line on the side opposite to the side where the center of the first protrusion is positioned with respect to the short side center line parallel to the short sides of the first surface,
wherein the circuit board is fixed to the first surface of the housing in a mutually fitted state of the first aperture and the second protrusion,
wherein a first circuit, which includes a hard disk controller, an MPU, a read/write channel, and a motor drive unit, is provided on the circuit board on the side where the center of the second protrusion is positioned with respect to the short side center line parallel to the short sides of the first surface and on the side opposite to the side where the center of the second protrusion is positioned with respect to the long side center line parallel to the long sides of the first surface, and
wherein a connecting terminal for connection between the hard disk controller and an external host is provided on the circuit board in the longitudinal direction of the first surface on the side where the center of the second protrusion is positioned with respect to the center of the first protrusion.

5 more elements

Dependencies are inferred from the claim text.