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| Number | Title | Issue Date |
| 7057740 | System and method for calibrating a hard disc drive magnetic head flying height tester by optical interference techniques A system and method are disclosed for calibrating a hard disc drive magnetic head flying height tester by a calibration standard, which includes a mock slider and mock disc, by optical interference techniques. ... | 06/06/2006 |
| 7057719 | System and method for hard disc drive magnetic head flying height tester calibration A system and method are disclosed for calibrating a hard disc drive magnetic head flying height tester by a calibration standard, which includes a mock slider and mock disc, by optical interference techniques. ... | 06/06/2006 |
| 6968731 | High speed glide test for screening magnetic disc micro-waviness and a system therefor A system and a method for measuring micro-waviness of a magnetic recording disk using a high-speed glide test are disclosed. The HSG test is a viable production-level test methodology for high performance media that require well-controlled and low micro-waviness. | 11/29/2005 |
| 6920008 | Slider fly-height measurement using viscoelastic material A method is presented for measuring the height of an air-bearing separating a flying component from a rotating surface using physical deformation of a small amount of material deposited on the surface. One embodiment of the invention is a method of measuring the fly... | 07/19/2005 |
| 6836323 | Spatial reference system The present invention overcomes the disadvantages of the related art by providing a spatial reference system that includes at least one artifact assembly. The artifact assembly has a measuring bar assembly including an inner member with a proximate end and a distal ... | 12/28/2004 |
| 6704103 | Coatings for sensitivity enhancement of signal from glass disks The present invention is a method for providing a disk of an optical tester. The disk comprises a transparent substrate that has a first surface and an opposite second surface. The disk also includes a coating on the first surface of the transparent subst... | 03/09/2004 |
| 6445447 | Near field optical certifying head for disc asperity mapping An optical certifying head flies above a disc surface within an evanescent decay length of the disc surface. A light beam is focused through an objective lens, and further focused through a SIL. The SIL-focused light is coupled to the disc surface through... | 09/03/2002 |
| 6225136 | Method of producing a contaminated wafer A method of controllably adding at least one contaminant to a surface of a silicon wafer. The method includes providing a solution containing a known concentration of one or more contaminants and having a known pH. The solution is applied to a surface of ... | 05/01/2001 |
| 6142006 | Method and apparatus for calibrating a glide head and detection system for a magnetic disk drive A method and apparatus for calibrating a glide head and detector system performs a pre-screening to ensure the quality of the glide head and the piezoelectric sensor in the detection system. The glide head and the piezoelectric sensor detect a signal when... | 11/07/2000 |
| 5808736 | Thin film flying height calibration disk for calibrating flying height testers A calibration medium that is used to calibrate a flying height tester which measures the gap of an air bearing formed between a magnetic recording head and a substrate. The medium contains a first ridge and a second ridge that extend from an underlying su... | 09/15/1998 |
| 5767964 | Slider for calibration and correlation of flying height testers A method for calibration and correlation of flying height testers with a calibration slider. The calibration slider has an air bearing surface that contains a flat portion and a sloped portion. To verify accuracy and correlation between flying height test... | 06/16/1998 |
| 5706080 | Single test station that can test a flying height and electrical characteristics of a recording head A tester which can measure both the air bearing thickness and the dynamic electrical characteristics of a head gimbal assembly (HGA) of a hard disk drive. The tester has a disk that is rotated by a spindle motor. The disk has a transparent portion that is... | 01/06/1998 |
| 5696653 | Tooling for holding a head gimbal assembly A tooling fixture that holds a head gimbal assembly (HGA) of a hard disk drive within a piece of test equipment. The tooling fixture includes a plurality of pads that extend from a top surface of a chimney. The HGA has a slider that is mounted to a flexur... | 12/09/1997 |
| 5552884 | Calibration standard for flying height tester having a head mounted on a multilevel surface transparent disc The present invention provides a calibration standard for the uniform calibration of flying height testers. The calibration standard comprises a head assembly held in contact with a transparent disc through the use of a load spring. The transparent disc h... | 09/03/1996 |
| 5453831 | Method for calibrating a flying height tester utilizing a wedge slider and transparent disc held together A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail ex... | 09/26/1995 |
| 5410402 | Calibration standard for flying height tester having a wedge slider and a transparent disc held together A calibration standard for uniformly calibrating flying height testers. The calibration standard includes a wedge slider held in contact with a glass disc by a load bridge, load spring and cover case. The wedge slider has a first rail and a second rail ex... | 04/25/1995 |
| 4624564 | Calibration standards for flying height testers A calibration standard simulates predetermined flying characteristics of a magnetic head for calibrating flying height testers. The standard comprises a substrate having a reflective layer supported thereon. A transparent layer is disposed over the reflec... | 11/25/1986 |
