Abstract: [Object] To provide a fluid dynamic bearing filled with a lubricating oil composition containing a base oil and an ionic liquid, and to provide a spindle motor in which evaporation is suppressed in the lubricating oil composition provided in the fluid dynamic bearing by incorporating the fluid dynamic bearing in the spindle motor, and thus occurrence of a read/write error in an HDD can be suppressed, and a disk drive device including the spindle motor. [Solution means] A fluid dynamic bearing filled with a lubricating oil composition containing a base oil and an ionic liquid, wherein the ionic liquid contains at least one cation selected from the group consisting of a tetraalkylphosphonium cation and a tetraalkylammonium cation and at least one anion selected from the group consisting of an imide anion, a methide anion, and borate anions represented by formulae (C-1) to (C-3).

Abstract: Object Objective is to provide a grease composition for a pivot assembly and a pivot assembly bearing filled with the grease composition, and to provide a bearing apparatus as well as a drive apparatus including the bearing apparatus, which is capable of suppressing adhesion of a volatilized component to a magnetic disk or the like even when the grease composition is volatilized by application of the grease composition and the bearing, thereby suppressing occurrence of read/write errors of an HDD.

Abstract: [Object] To provide a fluid dynamic bearing filled with a lubricating oil composition containing a base oil and an ionic liquid, and to provide a spindle motor with evaporation being suppressed in the lubricating oil composition provided in the fluid dynamic bearing by incorporating the fluid dynamic bearing in the spindle motor, and thus occurrence of a read-write error in an HDD can be suppressed, and a disk drive device including the spindle motor. [Solution means] A fluid dynamic bearing filled with a lubricating oil composition containing a base oil and an ionic liquid, the ionic liquid including at least one cation selected from the group consisting of tetraalkylammonium cations and at least one anion selected from the group consisting of borate anions represented by Formulas (C-1) to (C-3): (where in the formula, R9 to R12 each independently represent a linear or branched alkyl group.

Abstract: Object To provide a fluid dynamic pressure bearing oil and a fluid dynamic pressure bearing filled with the fluid dynamic pressure bearing oil, and to provide a spindle motor and a disk drive device including the spindle motor in which the fluid dynamic pressure bearing oil and the bearing are used, thereby suppressing adhesion of a volatile component to a magnetic disk or the like even when the fluid dynamic pressure bearing oil is volatilized, so that occurrence of HDD read/write errors can be suppressed.

Abstract: Object Objective is to provide a grease composition for a pivot assembly and a pivot assembly bearing filled with the grease composition, and to provide a bearing apparatus as well as a drive apparatus including the bearing apparatus, which is capable of suppressing adhesion of a volatilized component to a magnetic disk or the like even when the grease composition is volatilized by application of the grease composition and the bearing, thereby suppressing occurrence of read/write errors of an HDD.

Abstract: There is provided a load detector including a beam-type load cell which is supported on a support base in a cantilever manner, and a platform connected to the beam-type load cell. The platform includes a main body on which a subject is to be placed and a slope having a first end, which is connected to the main body, the slope being configured to guide the subject to the main body. The slope is configured to swing between a first position in which a second end of the slope is in contact with a placement surface on which the load detector is placed and a second position in which the second end is separated from the placement surface. The platform further includes a lever connected to the first end of the slope and positioned above the main body.

Abstract: There is provided a load detector including: first and second beam-type load cells which are supported on first and second support bases, respectively, in a cantilever manner; a placement part on which a rolling body is to be placed, and which includes first and second connection parts connected to the first and second beam-type load cells, respectively, and a pair of walls, the placement part being disposed between the first and second beam-type load cells; and a restriction member which is detachably attached to at least one of the pair of walls, and which is configured to restrict a posture of the rolling body on the placement part. The first connection part is connected to the first beam-type load cell on a side of the free end and the second connection part is connected to the second beam-type load cell on a side of the free end.

Abstract: There is provided a load detector including: first and second beam-type load cells which are supported on first and second support bases, respectively, in a cantilever manner; a placement part on which a rolling body is to be placed, and which includes first and second connection parts connected to the first and second beam-type load cells, respectively, and a pair of walls, the placement part being disposed between the first and second beam-type load cells; and a restriction member which is detachably attached to at least one of the pair of walls, and which is configured to restrict a posture of the rolling body on the placement part. The first connection part is connected to the first beam-type load cell on a side of the free end and the second connection part is connected to the second beam-type load cell on a side of the free end.

Abstract: There is provided a load detector including a beam-type load cell which is supported on a support base in a cantilever manner, and a platform connected to the beam-type load cell. The platform includes a main body on which a subject is to be placed and a slope having a first end, which is connected to the main body, the slope being configured to guide the subject to the main body. The slope is configured to swing between a first position in which a second end of the slope is in contact with a placement surface on which the load detector is placed and a second position in which the second end is separated from the placement surface. The platform further includes a lever connected to the first end of the slope and positioned above the main body.

Abstract: The load detector includes: first and second beam type load cells which are supported on first and second support bases in a cantilever manner to have free ends; and a mounting part on which an object is to be placed, which includes first and second connection parts connected to the first and second beam type load cells, and which is disposed between the first and second beam type load cells. The free ends of the first and second beam type load cells face opposite directions to each other in an extending direction of the first beam type load cell. The first and second connection parts of the mounting part are respectively connected to the first and second beam type load cells on a side of the free ends of the first and second beam type load cells.

Abstract: The load detector includes: first and second beam type load cells which are supported on first and second support bases in a cantilever manner to have free ends; and a mounting part on which an object is to be placed, which includes first and second connection parts connected to the first and second beam type load cells, and which is disposed between the first and second beam type load cells. The free ends of the first and second beam type load cells face opposite directions to each other in an extending direction of the first beam type load cell. The first and second connection parts of the mounting part are respectively connected to the first and second beam type load cells on a side of the free ends of the first and second beam type load cells.

Abstract: It is provided a long life spindle motor that is excellent in startup characteristic in low-temperature environments such as 0° C., and that startup problems due to the evaporation or deterioration of lubricating oil can be avoided in high-temperature environments. The spindle motor includes a fluid dynamic bearing filled with a lubricating oil, containing a methyl pentanediol diester obtained by esterifying 3-methyl-1,5-pentanediol with n-decanoic acid and n-undecanoic acid at a molar ratio ranging from 90:10 to 20:80, and having a water content of not more than 1000 ppm.

Abstract: There is provided a fluid dynamic pressure bearing apparatus including a shaft, a bearing sleeve rotatably supporting the shaft, and a lubricating oil filled between the shaft and the bearing sleeve, wherein at least one of the shaft and the bearing sleeve is formed of a copper alloy containing 0.8 wt % to 5 wt % of lead, and a base oil of the lubricating is a member selected from the group consisting of monoester, dibasic acid diester, diol ester and mixtures thereof, and the lubricating oil contains 0.1 wt % to 1 wt % of condensed phosphate ester. The fluid dynamic pressure bearing apparatus is capable of suppressing the hydrolysis of the lubricating oil, and the wear of the shaft and the bearing sleeve.