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US4797764A
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Recording disk with low total indicated runout
Assignee: 3M Co
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Filing: 1986-01-27
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Granted: 1989-01-10
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Expires: 2006-01-27
Abstract
Abstract A magnetic recording medium disk with substantially improved tolerances comprising: a hub including a center portion and recessed flange portion, the center portion having a planar drive surface; magnetic medium, including a side zero and a side one; and an adhesive bonding the side one of the medium to the flange of the hub, wherein the side zero of the medium is fixed a precise, desired distance α from the plane of the drive surface and the total indicated runout of the hub used divided by the total indicated runout of the distance α is greater than one. A method and apparatus for manufacturing a magnetic recording medium disk with substantially improved tolerances by applying ultrasonic vibrations to the medium and a hot melt adhesive until the precise desired distance α is achieved.
Inventors
- 👤 Arlin B. Doering
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:26
CPC Classifications
B; B29; B29C; B29C66/00; B29C66/40; B29C66/47; B29C66/474; G; G11; G11B; G11B5/00; G11B5/74; G11B5/82; B29C65/00; B29C65/02; B29C65/08; B29C65/48; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/80; B29C66/81; B29C66/814; B29C66/8141; B29C66/81427; B29C66/83; B29C66/832; B29C66/8322; G11B23/00; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B5/825; B29C65/4805; B29C65/481; B29C65/4815; B29C65/4825; B29C65/483; B29C65/484; B29C66/302; B29C66/3022; B29C66/30223; B29L; B29L2017/00; B29L2017/001; B29L2017/003
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
A magnetic recording medium disk comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and a thermoplastic adhesive which can be melted by ultrasonic vibrations, located between the magnetic medium and the hub flange and bonding said side one of said medium to said flange of said hub; said side zero of said medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; wherein, the T.I.R. ratio is defined as hub T.I.R. divided by α T.I.R., and the magnetic recording medium disk is characterized by a T.I.R. ratio greater than one.
Claim 2
Dependent Claim
138 words
A magnetic recording medium disk comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and a thermoplastic adhesive which can be melted by ultrasonic vibrations, located between the magnetic medium and the hub flange and bonding said side one of said medium to said flange of said hub; said side zero of said medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; wherein, the T.I.R. ratio is defined as hub T.I.R. divided by α T.I.R., and the magnetic recording medium disk is characterized by a T.I.R. ratio greater than one.
Claim 3
Dependent Claim
12 words
The disk of claim 1 wherein said thermoplastic adhesive is a polyester.
Claim 4
Dependent Claim
139 words
A plurality of randomly selected magnetic recording medium disks each comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and a thermoplastic adhesive which can be melted by ultrasonic vibrations, located between the magnetic medium and the hub flange and bonding said side one of said medium to said flange of said hub; said side zero of said medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; and characterized by an average T.I.R. ratio greater than one; wherein, the T.I.R. ratio is defined as average hub T.I.R.divided by average α T.I.R.
Claim 5
Dependent Claim
139 words
A plurality of randomly selected magnetic recording medium disks each comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and a thermoplastic adhesive which can be melted by ultrasonic vibrations, located between the magnetic medium and the hub flange and bonding said side one of said medium to said flange of said hub; said side zero of said medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; and characterized by an average T.I.R. ratio greater than one; wherein, the T.I.R. ratio is defined as average hub T.I.R.divided by average α T.I.R.
Claim 6
Dependent Claim
143 words
A magnetic recording medium disk comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and an adhesive selected from the group consisting of silicones, eposies, acrylates, and cyanoacrylates located between the magnetic medium and the hub flange of said hub; said side one of said medium to said flange of said hub; said side zero of said amgnetic medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; wherein the T.I.R. ratio is defined as hub T.I.R. divided by α T.I.R., and the magnetic recording medium disk is characterized by a T.I.R. ratio greater than one.
Claim 7
Dependent Claim
143 words
A magnetic recording medium disk comprising: a one-piece hub, including a center portion and a flange portion, said center portion having a planar drive surface and said flange portion having a characteristic total indicated runout (hub T.I.R.); a magnetic medium, including a side zero and a side one; and an adhesive selected from the group consisting of silicones, eposies, acrylates, and cyanoacrylates located between the magnetic medium and the hub flange of said hub; said side one of said medium to said flange of said hub; said side zero of said amgnetic medium being fixed a distance, α, from the plane of said drive surface, the total indicated runout of α being called α T.I.R.; wherein the T.I.R. ratio is defined as hub T.I.R. divided by α T.I.R., and the magnetic recording medium disk is characterized by a T.I.R. ratio greater than one.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |