# US 10,872,632 B2 · Disk device with base and cover

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- Number: US 10,872,632 B2
- Document ID: US10872632B2
- Status: Granted
- Kind: B2
- Application number: 16/855,286
- Filed: 2020-04-22
- Published: 2020-08-06
- Granted: 2020-12-22
- Earliest claimed: 2018-09-10
- Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Applicants: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation
- Inventors: Yasuhiko Kato
- Web page: https://patentgrep.com/patent/US10872632B2

## CPC

- G11B 5/6005: {Specially adapted for spacing from a rotating disc using a fluid cushion}
- G11B 5/012: Recording on, or reproducing or erasing from, magnetic disks (G11B17/00, G11B19/00 take precedence)
- G11B 25/043: {using rotating discs}
- G11B 33/022: {Cases}
- G11B 33/148: {Reducing friction, adhesion, drag}
- G11B 33/1486: {Control/regulation of the pressure, e.g. the pressure inside the housing of a drive}
- F16C 2370/12: Hard disk drives or the like
- G11B 2005/0005: {Arrangements, methods or circuits}
- G11B 2220/2508: Magnetic discs
- 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)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

According to one embodiment, a disk device includes a disk-shaped recording medium, a base accommodating the recording medium, the base including a bottom wall, a sidewall on a peripheral portion of the bottom wall, and a rib on a part of an upper surface of the sidewall, a first cover on a part of the upper surface of the sidewall, and a second cover on a first surface of the rib and above the first cover. The rib includes a first region with a first width, a second region with a second width less than the first width, and the first surface with a fixed width around an entire circumference of the rib. The first region and the second region are located corresponding to a side portion of the recording medium.

## Claims

### Claim 1

A disk device comprising:
a disk-shaped recording medium;
a base accommodating the recording medium, the base comprising a bottom wall, a sidewall on a peripheral portion of the bottom wall, and a rib on a part of an upper surface of the sidewall, the rib comprising a first region with a first width and a second region with a second width less than the first width, a first chamfered surface with a first chamfered width in the first region, and a second chamfered surface with a second chamfered width which is less than the first chamfered width in the second region, the first region and the second region being located corresponding to a side portion of the recording medium;
a first cover provided on a part of the upper surface of the sidewall; and
a second cover provided on the rib and provided above the first cover.

### Claim 2 (depends on 1)

The disk device of claim 1, wherein
the rib comprises a first surface with a fixed width around an entire circumference of the rib, and a second surface provided on an inner side portion of the rib, and the first chamfered surface and the second chamfered surface are provided between the first surface and the second surface.

### Claim 3 (depends on 1)

The disk device of claim 1, wherein
the rib comprises a recess portion in which the second region comprises a bottom portion, and
the first cover comprises, in an outer peripheral portion thereof, a projecting portion corresponding to the recess portion of the rib.

### Claim 4 (depends on 1)

The disk device of claim 1, wherein
the sidewall of the base comprises a pair of long sidewalls, and a pair of short sidewalls, and the second region of the rib is provided on each of the long sidewalls and one of the short sidewalls.

### Claim 5 (depends on 1)

The disk device of claim 1, wherein
a gas of a density lower than that of air is sealed with the base and the first cover.

### Claim 6 (depends on 1)

The disk device of claim 1, wherein
the second region is more closer to the side portion of the recording medium than the first region.

### Claim 7 (depends on 1)

The disk device of claim 1, wherein
the rib is formed integrally with the sidewall.