US4624564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calibration standards for flying height testers
Assignee: Seagate Technology LLC
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Filing: 1985-04-01
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Granted: 1986-11-25
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Expires: 2005-04-01
Abstract
Abstract 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 reflective layer so that the reflective layer is disposed at a predetermined angle to a surface of the transparent layer, the predetermined angle representative of a predetermined flying angle of a head over a disk, the transparent layer having a thickness representative of a predetermined flying height of a head over a disk. A process for manufacturing and calibrating the calibration standard is also described.
Inventors
- 👤 Robert P. Dahlgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:14
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
108 words
Calibration standard for calibrating flying height testers by simulating predetermined flying characteristics of magnetic heads comprising: a substrate; a reflective layer supported by a surface of said substrate; a transparent layer disposed over said reflective layer, said transparent layer having an upper surface arranged at an acute angle to said reflective layer, said acute angle representing a predetermined flying angle of magnetic heads over a disk; and optical reference means carried by said transparent layer on said upper surface a finite distance from said reflective layer as measured perpendicular to the upper surface, said finite distance representing a predetermined flying height of a magnetic head over a disk.
Claim 2
Dependent Claim
108 words
Calibration standard for calibrating flying height testers by simulating predetermined flying characteristics of magnetic heads comprising: a substrate; a reflective layer supported by a surface of said substrate; a transparent layer disposed over said reflective layer, said transparent layer having an upper surface arranged at an acute angle to said reflective layer, said acute angle representing a predetermined flying angle of magnetic heads over a disk; and optical reference means carried by said transparent layer on said upper surface a finite distance from said reflective layer as measured perpendicular to the upper surface, said finite distance representing a predetermined flying height of a magnetic head over a disk.
Claim 3
Dependent Claim
32 words
Apparatus according to claim 1 wherein said transparent layer has a side normal to said upper surface and said optical reference means comprises the edge intersecting said side and said upper surface.
Claim 4
Independent Claim
90 words
A method of manufacturing a calibration standard for calibrating flying height testers comprising the steps of depositing a layer of reflective material onto a smooth surface of a substrate; depositing a layer of transparent material over said reflective layer; grinding opposite, substantially parallel surfaces of said device at a predetermined angle to said reflective layer, said angle representing a predetermined flying angle; and etching said transparent layer normal to the ground surface of said transparent layer to define a predetermined flying height by the minimum thickness of the transparent layer.
Claim 5
Independent Claim
90 words
A method of manufacturing a calibration standard for calibrating flying height testers comprising the steps of depositing a layer of reflective material onto a smooth surface of a substrate; depositing a layer of transparent material over said reflective layer; grinding opposite, substantially parallel surfaces of said device at a predetermined angle to said reflective layer, said angle representing a predetermined flying angle; and etching said transparent layer normal to the ground surface of said transparent layer to define a predetermined flying height by the minimum thickness of the transparent layer.
References Cited (Backward Citations)
US3678219A
Cited
US4346996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |