US5861196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laser texturing a glass or glass-ceramic substrate
Assignee: Seagate Technology LLC
•
Filing: 1997-09-25
•
Granted: 1999-01-19
•
Expires: 2017-09-25
Abstract
Abstract A magnetic recording medium is formed with a laser textured glass, ceramic or glass-ceramic substrate. The use of a pulsed, focused laser light beam, such as a CO 2 derived laser light beam, through an acoustic-optical modulator enables the use of a high pulse repetition rate and/or short pulses. The resulting laser textured substrate comprises a plurality of dome-like protrusions extending above the substrate.
Inventors
- 👤 David Kuo
- 👤 Stan Vierk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:28
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/84; G11B5/8404; B; B23; B23K; B23K26/00; B23K26/08; B23K26/0823; C; C03; C03C; C03C23/00; C03C23/0005; C03C23/0025; C04; C04B; C04B41/00; C04B41/0036
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
43 words
A method of manufacturing a magnetic recording medium, which method comprises: texturing the surface of a glass, ceramic or glass-ceramic substrate by exposing the surface to a pulsed, focused laser light beam, through an acoustic-optical modulator to form a plurality of dome-like protrusions.
Claim 2
Independent Claim
43 words
A method of manufacturing a magnetic recording medium, which method comprises: texturing the surface of a glass, ceramic or glass-ceramic substrate by exposing the surface to a pulsed, focused laser light beam, through an acoustic-optical modulator to form a plurality of dome-like protrusions.
Claim 3
Dependent Claim
13 words
The method according to claim 1, comprising rotating the substrate during laser texturing.
Claim 4
Dependent Claim
22 words
The method according to claim 1, comprising texturing the surface with a laser light beam having a wavelength of about 10 μm.
Claim 5
Dependent Claim
23 words
The method according to claim 3, comprising texturing the surface with a laser light beam derived from a CW CO 2 laser source.
Claim 6
Dependent Claim
21 words
The method according to claim 1, comprising pulsing the laser light beam at a pulse repetition rate greater than 100 kHz.
Claim 7
Dependent Claim
15 words
The method according to claim 5, employing a 100 watt CW CO 2 laser source.
Claim 8
Dependent Claim
21 words
The method according to claim 1, comprising pulsing the laser light beam at a pulse repetition rate greater than 300 kHz.
Claim 9
Dependent Claim
15 words
The method according to claim 7, employing a 100 watt CW CO 2 laser source.
Claim 10
Dependent Claim
21 words
The method according to claim 8, comprising pulsing the laser light beam at a pulsed repetition rate greater than 400 kHz.
Claim 11
Dependent Claim
21 words
The method according to claim 1, comprising pulsing the laser light beam at a pulse duration of less than 1 μs.
Claim 12
Dependent Claim
19 words
The method according to claim 10, comprising employing an acoustical-optical modulator having a band width greater than 2 MHz.
Claim 13
Dependent Claim
16 words
The method according to claim 1, comprising laser texturing the surface to form a landing zone.
Claim 14
Dependent Claim
26 words
The method according to claim 12, further comprising depositing a magnetic layer on the textured surface, wherein the texture is substantially replicated on the magnetic layer.
Claim 15
Dependent Claim
17 words
The method according to claim 12, wherein the textured surface is substantially replicated on subsequently deposited layers.
Claim 16
Dependent Claim
32 words
The method according to claim 12, comprising: polishing the upper surface of the substrate; and laser texturing a portion of the surface to form a landing zone leaving a polished data zone.
References Cited (Backward Citations)
US3938878A
Cited
US3674340A
Cited
US3689293A
Cited
US3764218A
Cited
US3732087A
Cited
US4060306A
Cited
US4139263A
Cited
US4386162A
Cited
US4467039A
Cited
US5416755A
Cited
US4608348A
Cited
US5128914A
Cited
US4985306A
Cited
US4971932A
Cited
US4971932B1
Cited
US5202810A
Cited
US5079657A
Cited
US5162073A
Cited
US5062021A
Cited
US5108781A
Cited
US5236763A
Cited
US5143578A
Cited
US5166006A
Cited
US5402407A
Cited
US5273834A
Cited
US5391522A
Cited
EP0652554A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-01-18 | 2002-07-20 | 2003-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-01-18 | 2006-07-20 | 2007-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-01-18 | 2010-07-20 | 2011-01-19 | $7700.00 | Window Closed / Lapsed |