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JP-2026075859-A - Magnetic recording device and method for manufacturing the same

JP2026075859AJP 2026075859 AJP2026075859 AJP 2026075859AJP-2026075859-A

Abstract

[Problem] To provide a magnetic recording device and a method for manufacturing the same that can suppress the deterioration of the head and recording medium and maintain constant performance over a long period of time. [Solution] According to the embodiment, the magnetic recording device comprises a housing with 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 for performing information processing on the recording medium. [Selection Diagram] Figure 1

Inventors

  • 木村 香里
  • 古橋 貴夫
  • 大竹 雅哉

Assignees

  • 株式会社東芝
  • 東芝デバイス＆ストレージ株式会社

Dates

Publication Date
20260511
Application Date
20241023

Claims (12)

  1. A housing with an internal dew point of 5°C or lower, A disk-shaped recording medium provided inside the aforementioned housing, A magnetic head provided inside the housing performs information processing on the recording medium, A magnetic recording device equipped with the following features.
  2. The magnetic recording apparatus according to claim 1, wherein, at a temperature range of at least -5 to 60°C, the dew point inside the housing is below the ambient temperature and 5°C or less.
  3. The magnetic recording apparatus according to claim 1, further comprising a moisture-absorbing material provided inside the aforementioned housing.
  4. The magnetic recording apparatus according to claim 1, wherein the magnetic head includes a heat-assisted element.
  5. The magnetic recording apparatus according to claim 4, wherein the heat assist element includes a laser light source and an optical element that irradiates the recording medium with laser light.
  6. The magnetic recording apparatus according to claim 1, wherein the magnetic head includes an electric field assist element.
  7. The magnetic recording apparatus according to claim 1, wherein the interior of the housing contains 1% or more and less than 20% oxygen.
  8. A humidity sensor is provided inside the aforementioned housing, The magnetic recording apparatus according to claim 1, further comprising a controller including a conversion circuit for converting relative humidity measured by the humidity sensor into a dew point.
  9. The magnetic recording apparatus according to claim 8, wherein the controller includes a monitoring circuit for monitoring the dew point and an alarm that outputs an alarm when the dew point exceeds 5°C.
  10. The magnetic head includes an assist element that assists magnetic recording. The magnetic recording apparatus according to claim 9, wherein the controller includes a drive power supply circuit that supplies a drive current to the assist element, and a drive control unit that reduces the drive current when the alarm is output.
  11. A method for manufacturing a magnetic recording device, Prepare a quantity of desiccant to maintain the dew point inside the magnetic recording device housing at 5°C or below. In a constant temperature chamber with a dew point below 0°C and low humidity, A spindle motor, a disk-shaped recording medium, an actuator assembly including a magnetic head, a voice coil motor, and the moisture-absorbing material are installed on the base of the housing. The cover is fixed to the base to form the housing. A method for manufacturing a magnetic recording device.
  12. A method for manufacturing a magnetic recording apparatus according to claim 11, wherein a low-density gas with a density lower than air and an oxygen concentration of 1% or more and less than 20% is sealed inside the enclosure.

Description

This embodiment of the invention relates to a magnetic recording apparatus and a method for manufacturing a magnetic recording apparatus. As a magnetic recording device, a magnetic recording device using a heat-assisted magnetic recording (HAMR) method with a magnetic head has been proposed. HAMR is a technology that increases recording capacity by heating the recording medium to a temperature above the Curie temperature (Tc) using a heat source such as a laser during recording. In thermal-assisted magnetic recording, high-temperature regions occur in the head and recording medium, albeit locally. Therefore, the environment within the magnetic recording device influences the degradation modes of the head and recording medium. For example, moisture present within the magnetic recording device, under high-temperature conditions, can cause various degradation modes, such as head corrosion or the decomposition of the recording medium's lubricant, generating acid. Strength Patent No. 10,468,071U.S. Patent No. 10,734,035U.S. Patent No. 6,409,380Strength Patent No. 7,119,978 Figure 1 is an exploded perspective view of a hard disk drive (HDD) according to the first embodiment, showing the top cover disassembled.Figure 2 is a schematic side view showing the tip of the suspension assembly and the magnetic head in the HDD.Figure 3 is a cross-sectional view showing an enlarged view of the head portion of the magnetic head.Figure 4 is an enlarged cross-sectional view showing the recording head and heat assist element portion of the magnetic head.Figure 5 is a block diagram that schematically shows the overall configuration of the HDD.Figure 6 shows the relationship between relative humidity and dew point in the HDD.Figure 7 is an enlarged cross-sectional view showing the head portion of the magnetic head in the HDD according to the second embodiment.Figure 8 is an enlarged cross-sectional view showing the recording head and electric field assist element portion of the magnetic head. A magnetic recording apparatus according to an embodiment will be described below with reference to the drawings. Furthermore, the disclosure is merely an example, and any modifications that can be easily conceived by a person skilled in the art while maintaining the spirit of the invention are naturally included within the scope of the present invention. In addition, the drawings may schematically represent the size, shape, etc. of each part in order to clarify the explanation, but these are merely examples and do not limit the interpretation of the present invention. In addition, in this specification and each drawing, elements similar to those described above in previously shown drawings are denoted by the same reference numerals, and detailed explanations may be omitted as appropriate. (First Embodiment) A hard disk drive (HDD) according to the first embodiment will be described in detail as a magnetic recording device. Figure 1 is an exploded perspective view of the HDD according to the first embodiment, showing the cover disassembled. As shown in Figure 1, the HDD comprises a substantially rectangular housing 10. The housing 10 includes a rectangular box-shaped base 12 with an open top, an inner cover 14 that is screwed to the base 12 by a plurality of screws 13 and closes the upper end opening of the base 12, and an outer cover (top cover) 11 that is placed on top of the inner cover 14 and whose peripheral edge is welded to the base 12. The base 12 has a rectangular bottom wall 12a that faces the inner cover 14 with a gap between them, and side walls 12b that are erected along the periphery of the bottom wall 12a, and is integrally molded from, for example, an aluminum alloy. The side walls 12b include a pair of opposing long side walls and a pair of opposing short side walls. A substantially rectangular frame-shaped fixing rib 12c is provided protruding from the upper end surface of the side walls 12b. The inner cover 14 is formed in a rectangular plate shape, for example, from stainless steel. The inner cover 14 is fixed to the inside of the fixing rib 12c by screws 13 at its peripheral edge, which are fastened to the upper surface of the side wall 12b. The outer cover 11 is formed in a rectangular plate shape, for example, from aluminum. The outer cover 11 has a planar dimension slightly larger than that of the inner cover 14. The outer cover 11 is fixed airtightly to the base 12 by welding its peripheral edge all the way around to the fixing rib 12c of the base 12. The inner cover 14 and the outer cover 11 each have ventilation holes 31 and 33 that connect the inside and outside of the housing 10. Air inside the housing 10 is exhausted through the ventilation holes 31 and 33, and a low-density gas (inert gas) with a lower density than air, such as helium (He), is sealed into the housing 10 through these ventilation holes 31 and 33. A seal (encapsulation body) 35 is attached to the outer surface of the outer cover 11 to block the v