Abstract: In a manufacturing method, energy beam heat is radiated to a target area of the motor assembly which is used for a storage disk drive. By radiating energy beam thereto, a portion of the motor assembly is deformed in a non-contact manner, thus, without being affected by elastic recovery of a portion of the motor assembly to be deformed, the machining accuracy of the motor assembly is adjusted in a precise manner.

Abstract: A chucking device comprises a retainer section for retaining a disc, a guiding section for guiding the disc to the retainer section, and a supporter for supporting the retainer section and the guiding section. The guiding section has a small enough angle for a guiding section side angle of inclination ?1 so as not to make contact with a upward facing disc, of a multilayer disc, thereby reducing a disc loading force.

Abstract: A chucking device comprises a retainer section for retaining a disc, a guiding section for guiding the disc to the retainer section, and a supporter for supporting the retainer section and the guiding section. The guiding section has a small enough angle for a guiding section side angle of inclination ?1 so as not to make contact with a upward facing disc, of a multilayer disc, thereby reducing a disc loading force.

Abstract: In a manufacturing method, energy beam heat is radiated to a target area of the motor assembly which is used for a storage disk drive. By radiating energy beam thereto, a portion of the motor assembly is deformed in a non-contact manner, thus, without being affected by elastic recovery of a portion of the motor assembly to be deformed, the machining accuracy of the motor assembly is adjusted in a precise manner.

Abstract: A recording disk driving motor and a recording disk driving apparatus having the motor are disclosed. The recording disk driving motor comprises a position restricting portion between a fastening member and the upper part of the motor to restrict the amount by which the fastening member is fastened axially downward. Thus, the pressure transferred from the fastening member to a clamp member fails to be directly transferred to a thrust bearing section through a rotor upper wall portion.

Abstract: A gas dynamic pressure bearing comprises a shaft, a sleeve whose inner peripheral surface is opposed to an outer peripheral surface of the shaft through a micro-gap, and a substantially cylindrical hub which applies a surface pressure to an outer side of the sleeve and which is fitted to the sleeve, and at least one of the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve is formed with a dynamic pressure generating groove, and if linear expansion coefficients of the shaft, the sleeve and the hub are defined as a0, a1 and a2, respectively, a relation of a1<?0<?2 is satisfied.