# US 2025/0095685 A1 · Magnetic disk device

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- Number: US 2025/0095685 A1
- Document ID: US20250095685A1
- Status: Published application
- Kind: A1
- Application number: 18/732,743
- Filed: 2024-06-04
- Published: 2025-03-20
- Earliest claimed: 2023-09-20
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Inventors: Tomohiko JIMBO; Biswas DEBASISH; Makoto OKAMOTO; Yasuhiko KATO
- Web page: https://patentgrep.com/patent/US20250095685A1

## CPC

- G11B 25/043: {using rotating discs}
- G11B 33/148: {Reducing friction, adhesion, drag}
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

A magnetic disk device includes a disk rotatable in a rotation direction and a shroud that at least partially surrounds the disk along an outer edge of the disk with a gap from the outer edge of the disk. A guide vane is connected to the shroud at a downstream side of an airflow generated in the rotation direction. The guide vane has a structure that decelerates an airflow between the guide vane and the disk.

## Claims

### Claim 1

A magnetic disk device comprising:
a disk rotatable in a rotation direction;
a shroud that at least partially surrounds the disk along an outer edge of the disk with a gap from the outer edge of the disk; and
a guide vane connected to the shroud at a downstream side of an airflow generated in the rotation direction,
wherein
the guide vane has a structure that decelerates an airflow between the guide vane and the disk.

### Claim 2 (depends on 1)

The magnetic disk device according to claim 1, wherein
a distance between the guide vane and the disk is larger than a distance between the shroud and the disk.

### Claim 3 (depends on 1)

The magnetic disk device according to claim 1, wherein
the guide vane includes:
a guide vane connection portion connected to the shroud;
a guide vane distal end portion which is a portion at a distal end on a downstream side of the flow; and
a guide vane central portion between the guide vane connection portion and the guide vane distal end portion, and
a distance between the guide vane central portion and the disk is larger than a distance between the guide vane connection portion and the disk.

### Claim 4 (depends on 1)

The magnetic disk device according to claim 1, wherein
the guide vane includes:
a guide vane connection portion connected to the shroud;
a guide vane distal end portion which is a portion at a distal end on a downstream side of the flow; and
a guide vane central portion between the guide vane connection portion and the guide vane distal end portion, and
a distance between the guide vane central portion and the disk is larger than a distance between the guide vane connection portion and the disk, and a distance between the guide vane distal end portion and the disk is larger than the distance between the guide vane central portion and the disk.

### Claim 5 (depends on 1)

The magnetic disk device according to claim 1, wherein
the guide vane includes:
a guide vane connection portion connected to the shroud;
a guide vane distal end portion which is a portion at a distal end on a downstream side of the flow;
a guide vane central portion located between the guide vane connection portion and the guide vane distal end portion; and
an airflow guide portion located on the further downstream side of the flow of the guide vane distal end portion, and
a distance between the guide vane central portion and the disk is larger than a distance between the guide vane connection portion and the disk, and a distance between the airflow guide portion and the disk is smaller than a distance between the guide vane distal end portion and the disk.

### Claim 6 (depends on 1)

The magnetic disk device according to claim 1, wherein
the guide vane has unevenness, grooves, or protrusions on a surface.

### Claim 7 (depends on 1)

The magnetic disk device according to claim 1, further comprising:
a casing;
a magnetic head that reads data recorded on the disk and writes data to the disk;
an arm having the magnetic head at a distal end; and
an actuator that controls a position of the magnetic head;
wherein
the casing internally includes the disk, the shroud, the guide vane, the magnetic head, the arm, and the actuator.

### Claim 8

A magnetic disk device comprising:
a disk provided to be rotationally driven by a rotation shaft;
a shroud that partially surrounds the disk along an outer edge of the disk with a gap from the outer edge of the disk; and
a guide vane having one end connected to an end portion of the shroud;
wherein
a distance between the guide vane and the disk is larger than a distance between the shroud and the disk.

### Claim 9 (depends on 8)

The magnetic disk device according to claim 8, further comprising:
a casing;
a magnetic head that reads data recorded on the disk and writes data to the disk;
an arm having the magnetic head at a distal end; and
an actuator that controls a position of the magnetic head;
wherein
the casing internally includes the disk, the shroud, the guide vane, the magnetic head, the arm, and the actuator.