Seiko Seiki Kabushiki Kaisha

Ryuichi Matsuzaki

Toshiharu Kogure

Shinji Koyano

Yoshitake Ueshima

A vacuum-oriented vertical transfer system which provides super vacuum/super clean environments, and a gate valve assembly which reduces the size of electromagnet sections. The vacuum-oriented vertical transfer system includes a cylindrical partition wall, and a rod vertically moved through an open bottom of a vacuum container. The rod is floatingly supported in radial and axial directions thereof by a radial magnetic support device and an axial magnetic support device, respectively. The gate valve assembly comprises a closure member mounted for positioning adjacent to and away from a port of a container to close and open the port, respectively. A neck member is integrally connected to the closure member and is mounted for movement to position the closure member to open and close the port of the container. A radial magnet device levitates the neck member by magnetic forces in a radial direction thereof. An axial magnetic device levitates the neck member by magnetic forces in an axial direction thereof. A moving mechanism moves the neck member to position the closure member to open and close the port of the container.

Vertical transfer system for a vacuum chamber and gate valve assembly

An apparatus for detecting defects in a processing track on a hard disc uses an average or mean average level value as a reference value, in which an arithmetic means computes the average or mean average level value based on an average level value (Track Average Amplitude or TAA) for a plurality of tracks prior to the processing track which is stored in a memory means. The apparatus enables obtaining the reference value with less dispersion, which gives even and stable detected results of any defect in each track on the hard disc, and enables improvement in the efficiency of the throughput.

Hard disc track defect detecting apparatus

Hard disk testing apparatus and method having a plurality of heads mounted on a carriage capable of moving in the direction of a hard disc at intervals defined by dividing the radius of the hard disc, write circuit for writing a test signal through the heads in the hard disc, read circuit for reading a signal written through the heads, and measuring function for measuring a separation between one head of the heads and another head of the heads provided adjacent to the one head based on a shift distance of the another head shifted to read a signal written by the one head. A separation of the heads is accurately measured without a measuring device, and micro adjustment of positions of the heads based on the measured separation is not required. The possibility of double testing of or failure in testing tracks on the border is eliminated, and thereby disc test is efficiently performed.

Apparatus and method for hard disk testing

A hard disk testing apparatus is comprised of a pair of carriages, each provided with a pair of upper and lower heads, and one of the upper and lower heads on either of the carriages is mounted on a micro adjustment carriage. With this structure, the head mounted on the fixed carriage writes a signal, and the head mounted on the carriage equipped with the micro adjustment carriage reads the signal. The structure and operation of the apparatus effectively prevent omission or duplication of testing tracks at the border between a test range of a hard disk covered by one of the pair of carriages and another test range covered by the other carriage.

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Narashino, Japan

Ryuichi Matsuzaki