Glass spacer, hard disk drive apparatus, and method for manufacturing glass spacer
AssigneeHoya Corporation
InventorsShinji Eda, Kinobu Osakabe, Yoshitake Tanno, Mikio Ikenishi
Life of this patent
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Abstract
A glass material of a glass spacer has a surface resistivity of 103 to 109 (Ω/sq) at 22 (° C.). The surface resistivity of a surface of the glass material of the glass spacer at 22 (° C.) is lower than the surface resistivity of an inner portion of the glass material at 22 (° C.). The glass spacer contains at least one oxide selected from the group consisting of TiO2, Nb2O5, WO3, and Bi2O3, as a glass component.
Claims20
A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus,
- wherein a glass material of the glass spacer has a surface resistivity of 103 to 109 (Ω/sq) at 22 (° C.), and
- a surface resistivity of a surface of the glass material of the glass spacer at 22 (° C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (° C.).
A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus,
- wherein a glass material of the glass spacer has a surface resistivity of 103 to 109 (Ω/sq) at 22 (° C.), and
- a surface roughness Rz of an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is at least 1.5 μm.
A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus,
- wherein a glass material of the glass spacer has a surface resistivity of 103 to 109 (Ω/sq) at 22 (° C.), and
- grooves that extend along an outer circumference of the glass spacer are formed in an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk.
A ring-shaped glass spacer to be arranged in contact with a magnetic disk in a hard disk drive apparatus,
- wherein a glass material of the glass spacer has a surface resistivity of 103 to 109 (Ω/sq) at 22 (° C.), and
- a skewness of an outer circumferential edge surface of the glass spacer that does not come into contact with the magnetic disk is not larger than 1.2.
Dependencies are inferred from the claim text.