Patent US5714207A successfully refreshed from Google Patents.
US5714207A
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Method of laser texturing glass or glass-ceramic substrates for magnetic recording media
Assignee: Seagate Technology LLC
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Filing: 1997-02-07
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Granted: 1998-02-03
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Expires: 2017-02-07
Abstract
Abstract The height of protrusions formed during laser texturing a glass or glass-ceramic substrate is controlled by controlling the quench rate of the protrusions during resolidification. In an embodiment, the quench rate is controlled by heating the substrate during laser texturing. Heating can be initiated prior or subsequent to, or simultaneously with, initial exposure of the substrate surface to a pulsed, focused CO 2 laser beam for texturing.
Inventors
- 👤 David Kuo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:19
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; C; C03; C03C; C03C23/00; C03C23/0005; C03C23/0025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
59 words
A method of manufacturing a magnetic recording medium, which method comprises: texturing a surface of a glass or glass-ceramic substrate with a pulsed, focused laser light beam to form a plurality of protrusions on and extending above the substrate surface; and controlling the height of the protrusions by controlling the quench rate during resolidification of the laser formed protrusions.
Claim 2
Independent Claim
59 words
A method of manufacturing a magnetic recording medium, which method comprises: texturing a surface of a glass or glass-ceramic substrate with a pulsed, focused laser light beam to form a plurality of protrusions on and extending above the substrate surface; and controlling the height of the protrusions by controlling the quench rate during resolidification of the laser formed protrusions.
Claim 3
Dependent Claim
28 words
The method according to claim 1, comprising controlling the height of the protrusions by heating the substrate apart from and during laser texturing to reduce the quench rate.
Claim 4
Dependent Claim
55 words
The method according to claim 2, comprising: applying heat to the substrate prior or subsequent to, or simultaneously with, initially exposing the substrate surface to the pulsed, focused laser light beam to melt and resolidify portions of the substrate to form a plurality of protrusions; and discontinuing heating the substrate after the protrusions have resolidified.
Claim 5
Dependent Claim
24 words
The method according to claim 2, comprising heating the substrate to a temperature up to the reflow temperature of the substrate during laser texturing.
Claim 6
Dependent Claim
28 words
The method according to claim 4, comprising heating the substrate to a temperature up to about 650° C. during laser texturing, wherein the substrate comprises a glass material.
Claim 7
Dependent Claim
25 words
The method according to claim 5, comprising heating the glass substrate to a temperature between about 100° C. and about 615° C. during laser texturing.
Claim 8
Dependent Claim
25 words
The method according to claim 4, comprising heating the substrate to a temperature up to about 750° C., wherein the substrate comprises a glass-ceramic material.
Claim 9
Dependent Claim
25 words
The method according to claim 7, comprising heating the glass-ceramic substrate to a temperature between about 100° C. and about 750° C. during laser texturing.
Claim 10
Dependent Claim
13 words
The method according to claim 2, comprising heating the substrate by radiant heat.
Claim 11
Dependent Claim
19 words
The method according to claim 2, comprising heating the substrate by exposing the substrate to a laser light beam.
Claim 12
Dependent Claim
64 words
The method according to claim 10, comprising: generating a laser light beam; splitting the generated laser light beam into first and second laser sub-beams; expanding the first laser sub-beam; focusing the second laser sub-beam; directing the expanded first laser sub-beam on the substrate surface to heat the substrate; and exposing the heated substrate to the focused second laser sub-beam to texture the substrate surface.
Claim 13
Dependent Claim
24 words
The method according to claim 2, wherein the substrate surface is textured with a laser light beam derived from a CO 2 laser source.
Claim 14
Dependent Claim
13 words
The method according to claim 2, comprising rotating the substrate during laser texturing.
Claim 15
Dependent Claim
20 words
The method according to claim 2, comprising laser texturing a portion of the substrate surface to form a landing zone.
Claim 16
Dependent Claim
18 words
The method according to claim 2, further comprising depositing a magnetic layer on the laser textured substrate surface.
Claim 17
Dependent Claim
35 words
The method according to claim 15, comprising: depositing an underlayer on the laser textured substrate surface; and depositing a magnetic layer on the underlayer; wherein the textured surface is substantially replicated on subsequently deposited layers.
Claim 18
Dependent Claim
37 words
The method according to claim 1, comprising controlling the height of the protrusions to less than about 150 nm and controlling the quench rate during resolidification of the laser formed protrusions to optimize glide and tribological performance.
Claim 19
Dependent Claim
19 words
The method according to claim 17, comprising controlling the height of the protrusions to less than about 30 nm.
Claim 20
Dependent Claim
21 words
The method according to claim 18, comprising controlling the height of the protrusions to about 3 nm to about 30 nm.
References Cited (Backward Citations)
US5370912A
Cited
US5492775A
Cited
US5567484A
Cited
US5595791A
Cited
US5550696A
Cited
US5586040A
Cited
US5582878A
Cited
US5595768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-02 | 2001-08-04 | 2002-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-02 | 2005-08-04 | 2006-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-02 | 2009-08-04 | 2010-02-03 | $7700.00 | Window Closed / Lapsed |