Abstract: An enclosure for a sealed disc drive includes a bottom support member and a top cover for mating with the bottom support member. The bottom support member includes a filter mounted on the inner surface and in a peripheral position thereof, and air guide means for directing air flow created by a spinning disc through the filter, the cover includes a second breather filter through which outside air can enter the enclosure. Air cleanliness within the enclosure is improved by providing a positive air pressure differential between the space below an enclosed disc and in the proximity of the spindle bearing seals and the space above the enclosed disc. The positive air pressure differential can be created by obstructing air flow below the disc.

Abstract: A linear actuator for a magnetic disc drive has shortened magnetic flux lines totally confined within the actuator housing whereby the actuator can be placed in closer proximity to a disc and thus reduce the size of the disc drive package. The actuator includes a generally cylindrical housing with magnets attached to the inside surface of the housing. A cylindrical bobbin having a voice coil wound on its periphery is positioned within the housing and linearly movable therein with the voice coil in close proximity to the magnets. An annular magnetic flux transmission means is attached to one face of the housing and a flux transmission plate is attached to the opposite face of the housing with the flux transmission means providing magnetic flux paths and preventing flux leakage from the housing.

Abstract: An enclosure for a sealed disc drive includes a bottom support member and a top cover for mating with the bottom support member. The bottom support member includes a filter mounted on the inner surface and in a peripheral position thereof, and air guide means for directing air flow created by a spinning disc through the filter, the cover includes a second breather filter through which outside air can enter the enclosure. Air cleanliness within the enclosure is improved by providing a positive air pressure differential between the space below an enclosed disc and in the proximity of the spindle bearing seals and the space above the enclosed disc. The positive air pressure differential can be created by obstructing air flow below the disc.

Abstract: A limit stop assembly for use with a linear actuator in a sealed magnetic disc drive which establishes inner and outer limits of travel and provides shock absorption for the pickup heads and carriage at the limits of travel. The assembly is mounted on an adjustable seat in a wall of the actuator. A first stop member is threadably attached to the seat, a second stop member is positioned about the first member, and a spring yieldably biases the second stop member away from the stop surface of the first member. A cup shaped member is positioned about the stop surface of the first member and is yieldably biased by the spring. The first stop member extends through a hole in the second stop member, and a shoulder of the first member limits the travel of the second stop member. Adjustment of the stop positions is accomplished by movement of the seat and the first member within the seat.