Asyst Technologies, Inc.

Lockheed Martin Corporation

Maxtor Corporation

Syquest Technology, Inc.

Michael J Mayo

Theodore W Rogers

Alfred A Zinn

Shawn M Hamilton

Bill Richard Baker

Rosser S Wilson

Roux M Heyns

A high performance high-electron mobility transistor (HEMT) design and methods of manufacturing the same are provided. This design introduces a bias layer in to the HEMT allowing the transistor to be fed with alternating current (AC) alone without the need for a negative direct current (DC) bias power supply.

AC-driven high electron mobility transistor devices

The present invention generally relates to an end effector that utilizes a gripping mechanism to grip a peripheral edge of the wafer and secure the wafer to the end effector. In one embodiment, the gripping mechanism includes a pair of gripper arms that pivot between a wafer-loading position and a wafer-engaging position. In another embodiment, an active plunger moves linearly between the wafer-loading and wafer-engaging positions. Both the gripper arms and the plunger device are driven by a motor assembly. A force feedback system monitors the force the gripping mechanism exerts on the wafer and, based on the amount of force, controls the operation of the motor assembly to dynamically adjust the position of the gripping mechanism.

Active edge gripping and effector

The present invention is a pre-aligner capable of determining the center of a wafer by casting light onto a wafer that is positioned above a charge-coupled device (CCD). The pre-aligner performs this operation by directing light emitted from a single LED simultaneously onto the wafer and the CCD. The light emitted from the LED is directed through a light guide in order to direct the light onto the wafer and CCD. A lens collimates the light exiting the light guide such that the light, as it passes the wafer's edge, is substantially perpendicular to the wafer's edge. The light guide may be removably secured to the pre-aligner housing for easy installation removal. The pre-aligner is capable of self-calibrate the LED.

Pre-aligner

A method for self-servo writing a disk drive includes the steps of transferring a servo reference pattern by magnetic printing onto at least one storage surface of a disk; assembling the disk drive including installing the disk into the disk drive and enclosing the disk and the data transducers within a housing sealed against particulate contamination from an eternal ambient environment; reading the servo reference pattern from the disk via transducer heads; using head position and timing information in the pattern to precisely position and maintain the data transducers at concentric track locations of disk storage surfaces; and self-writing disk drive servo patterns onto the storage surfaces at the concentric track locations with the data transducers in accordance with the disk drive servo pattern features. In one example, the reference pattern includes servo clock information providing transducer head circumferential relative position information, and a servo position information pattern having coarse position information for providing transducer head coarse radial relative position information, and fine position information for providing transducer head fine radial relative position information. The printed reference pattern features have a resolution lower than a disk drive servo pattern features proportional to head gap widths of data transducer heads included in the disk drive.

Self-writing of servo patterns in a disk drive using a printed reference pattern

A headerless, fault-tolerant sample-data servo pattern, comprising an alternating sequence of first and second servo sectors, with the first servo sectors each including a partial track address and circumferential orientation information, and the second servo sectors each including a full track address, provides an absolute indication of a read/write head's circumferential orientation along a given track on a magnetic disk which is robust in the presence of defects in the magnetic recording medium.

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Palo Alto, CA, United States of America

Michael J Mayo