Rotating disk storage device with actuator lock mechanism
View Patent ↗Embodiments of the invention permit a magnet-based actuator lock mechanism to operate smoothly in a magnetic disk drive that uses a base made of a magnetic material. In one embodiment, the base to be used is made of a magnetic material. The actuator lock mechanism includes a rotatable arm that retains a magnet. A magnetic attraction force, which is oriented toward the base as indicated by an arrow, is generated in the magnet. The base is provided with a cut to reduce the attraction force. The cut is covered with a sealing material to maintain internal airtightness. The actuator lock mechanism may be, for instance, an eddy-current latch, inertia latch, or magnetic latch.
1. A rotating disk storage device comprising:
a base containing a magnetic section;
a cover coupled to said base;
a rotating disk recording medium mounted on said base in a rotatable manner;
an actuator assembly to position a head over said rotating disk recording medium; and
an actuator lock mechanism containing a movable member to retain a magnet;
wherein an area demarcated by an orthogonal projection of said magnet onto said magnetic section of said base is provided with an aperture for decreasing the magnetic attraction force between the base and the magnet;
wherein the area demarcated by the orthogonal projection covers the whole track of the magnet that moves in accordance with the motion of the movable member.
2. The rotating disk storage device according to claim 1 , wherein said movable member is operated by a force exerted between said magnet and an eddy current generated on said rotating disk recording medium.
3. The rotating disk storage device according to claim 1 , wherein said movable member operates together with said actuator assembly while said magnet is attracted to said actuator assembly.
4. The rotating disk storage device according to claim 1 , wherein said movable member turns on a shaft that is coupled to said base.
5. The rotating disk storage device according to claim 1 , wherein said movable member performs a linear operation in a direction parallel to the surface of said base.
6. The rotating disk storage device according to claim 1 , wherein said actuator lock mechanism restrains said actuator assembly so that said head does not become displaced from a predetermined position when an impact is exerted on said rotating disk storage device.
7. The rotating disk storage device according to claim 1 , further comprising a crash stop, wherein said actuator lock mechanism restrains a rebound that may occur after said actuator assembly collides with said crash stop.
8. The rotating disk storage device according to claim 1 , wherein said actuator lock mechanism is configured such that the magnet for said movable member attracts and restrains said actuator assembly.
9. The rotating disk storage device according to claim 1 , wherein said aperture is larger than an area demarcated by the orthogonal projection of said magnet.
10. The rotating disk storage device according to claim 1 , wherein said aperture is shaped as a circle.
11. The rotating disk storage device according to claim 1 , wherein said base is formed by pressing a steel sheet.
12. The rotating disk storage device according to claim 1 , wherein said actuator lock mechanism comprises an eddy-current latch.