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AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorsKazuhide Ichikawa, Takashi Kouno, Akihiko Aoyagi, Takako Hayakawa
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Embodiments of the present invention help to provide a magnetic disk drive in which the base and the lid are securely welded together, so that the low-density gas sealed therein is protected from leakage. According to one embodiment, the peripheral surface of the rib of the base is machined to form the surface, which is free of electrocoating and weld surface. The outer lid, which completely conforms to the contour of the base, is placed on the rib, and the laser beam is directed onto the outer lid. Thus the position of laser beam irradiation varies within only ±0.05 mm for both the base and the lid. Laser welding in this manner yields the bead invariably, which makes the enclosure completely sealed without helium leakage.
A magnetic disk drive having a disk, a spindle motor to rotate said disk, a head to record and regenerate information on said disk, and an actuator assembly to move the head in the radial direction of said disk, which are placed in a hermetically sealed space filled with a low-density gas, said space being enclosed by an entirely electrocoated cast base having side walls and an outer lid joined to said side walls, wherein
A method for producing a magnetic disk drive, said method comprising:
Dependencies are inferred from the claim text.