Granted Patent B1

US 12,537,031 · App. 19/057,804 · Granted Jan 27, 2026

Inventors: Kaori Kimura (Yokohama Kanagawa, JP); Takao Furuhashi (Kawasaki Kanagawa, JP); Masaya Ohtake (Fujisawa Kanagawa, JP)

Assignees: Kabushiki Kaisha Toshiba; Toshiba Electronic Devices & Storage Corporation

G11B33/1453G11B2005/0021

Abstract

Claims (30)

1 . A magnetic recording device comprising:

a housing having an internal dew point of 5° C. or less;

a disk-shaped recording medium provided inside the housing, and

a magnetic head provided inside the housing, which performs information processing with respect to the recording medium.

2 . The magnetic recording device of claim 1 , wherein

the internal dew point of the housing is less than or equal to an ambient temperature and 5° C. or less at least in a temperature range of −5 to 60° C.

3 . The magnetic recording device of claim 1 , further comprising:

a moisture absorbent provided inside the housing.

4 . The magnetic recording device of claim 1 , wherein

the magnetic head includes a heat-assisted element.

5 . The magnetic recording device of claim 4 , wherein

the heat-assisted element includes a laser light source and an optical element which irradiates laser light onto the recording medium.

6 . The magnetic recording device of claim 1 , wherein

the magnetic head includes a field-assisted element.

7 . The magnetic recording device of claim 1 , wherein

the housing contains thereinside 1% or more and less than 20% of oxygen.

8 . The magnetic recording device of claim 1 , further comprising:

a humidity sensor provided in the housing; and

a controller including a conversion circuit which converts a relative humidity measured by the humidity sensor into a dew point.

9 . The magnetic recording device of claim 8 , wherein

the controller further includes a monitoring circuit which monitors the dew point and an alarm which outputs an warning when the dew point exceeds 5° C.

10 . The magnetic recording device of claim 9 , wherein

the magnetic head includes an assist element which assists magnetic recording, and

the controller includes a drive power supply circuit which supplied drive current to the assist element and a drive control unit which reduces the drive current when the warning is output.

11 . A method of manufacturing a magnetic recording device, the method comprising:

preparing a moisture absorbent in an amount that maintains an internal dew point of a housing of the magnetic recording device at 5° C. or less; and

installing, in a constant temperature oven of a low-humidity environment and a dew point of 0° C. or less, a spindle motor, a disk-shaped recording medium, an actuator assembly including a magnetic head, a voice coil motor, and the moisture absorbent on a base of the housing; and

fixing a cover to the base to form the housing.

12 . The method of claim 11 , wherein

a low-density gas having a density lower than that of air and an oxygen concentration of 1% or more and less than 20% is sealed inside the housing.

Assignments (1)

Priority Claims (1)

References Cited (28)