Patent US4863031A successfully refreshed from Google Patents.
US4863031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc cartridge having peripheral disc support
Assignee: TDK Corp
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Filing: 1986-12-16
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Granted: 1989-09-05
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Expires: 2006-12-16
Abstract
Abstract A disc cartridge capable of preventing a recording surface section of a disc from being contacted with an inner surface of a casing so that the disc may be free from any damage. The disc cartridge includes steps or sheet-like members provided on the inner surface of the casing in a manner to be inwardly projected from the inner surface. The steps or sheet-like members are positioned so as to be engaged with a non-recording surface section of the disc to support the disc thereon, so that a clearance may be defined between the recording surface section of the disc and the inner surface of the casing.
Inventors
- 👤 Kimio Tanaka
- 👤 Haruo Shiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:49
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/032; G11B23/0321
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
146 words
A disc cartridge, comprising: a casing having a space defined therein; a disc rotatably housed in said space of said casing; and disc holding means engaged with at least a part of said disc to support said disc thereon, said disc holding means being arranged on an inner surface of said casing; said disc holding means arranged to support a non-recording surface section of said disc to prevent a recording surface section of said disc from being contacted by said inner surface of said casing; said disc holding means comprising sheet-like members arranged on upper and lower surface sections of said inner surface of said casing in a manner such that at least a part of each of said sheet-like members inwardly projects from said inner surface of said casing; and said sheet-like members are arranged to positionally correspond to a peripheral section of said disc.
Claim 2
Dependent Claim
146 words
A disc cartridge, comprising: a casing having a space defined therein; a disc rotatably housed in said space of said casing; and disc holding means engaged with at least a part of said disc to support said disc thereon, said disc holding means being arranged on an inner surface of said casing; said disc holding means arranged to support a non-recording surface section of said disc to prevent a recording surface section of said disc from being contacted by said inner surface of said casing; said disc holding means comprising sheet-like members arranged on upper and lower surface sections of said inner surface of said casing in a manner such that at least a part of each of said sheet-like members inwardly projects from said inner surface of said casing; and said sheet-like members are arranged to positionally correspond to a peripheral section of said disc.
Claim 3
Dependent Claim
35 words
A disc cartridge as defined in claim 1, wherein said sheet-like members are at least partially formed of a material selected from the group consisting of ultra-high-molecular polyethylene, graphite teflon, polyethylene terephthalate and polybutylene terephthalate.
Claim 4
Dependent Claim
28 words
The cartridge of claim 1, additionally comprising recesses formed on upper and lower surface sections of said casing, and in which said respective sheet-like members are securely positioned.
Claim 5
Dependent Claim
16 words
The cartridge of claim 1, wherein said sheet-like members are arranged in a continuous ring-like manner.
Claim 6
Dependent Claim
16 words
The cartridge of claim 1, wherein said sheet-like members are arranged in an intermittent ring-like manner.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |