US4863031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc cartridge having peripheral disc support
Assignee: TDK Corp
•
Filing: 1986-12-16
•
Granted: 1989-09-05
•
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 14:40
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.
References Cited (Backward Citations)
US2691440A
Cited
US3109539A
Cited
US3980178A
Cited
US4327831A
Cited
US4511944A
Cited
US4387807A
Cited
EP0085165A1
Cited
US4583144A
Cited
US4433410A
Cited
US4520470A
Cited
US4630728A
Cited
US4707821A
Cited
US4499996A
Cited
US4609105A
Cited
US4661875A
Cited
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 |