US4581669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible magnetic disk cassette and a recording and/or reproducing apparatus for the same
Assignee: Sony Corp
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Filing: 1983-08-25
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Granted: 1986-04-08
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Expires: 2003-08-25
Abstract
Abstract A recording and/or reproducing apparatus and a magnetic disk cassette having a flexible magnetic disk and a cover for containing the magnetic disk. The cover has a driving hole for driving the flexible magnetic disk from outside of the cover, a recording opening for exposing a recording surface of the flexible magnetic disk, and a cut-out portion provided on one side of the cover for detecting correct installation of the flexible magnetic disk cassette into a recording and/or reproducing apparatus. A shutter is slidably provided on the cover for selectively exposing the recording surface through the recording opening and the cut-out portion when the flexible magnetic disk is ready for use. The recording and/or reproducing apparatus for the flexible magnetic disk cassette includes a driving member engaged with the flexible magnetic disk through the driving hole of the cover for rotating the flexible magnetic disk. A transducing head is contacted with the recording surface of the flexible magnetic disk through the recording opening when the shutter is in an operative position. A projection is provided in the apparatus in facing relation to the cut-out portion of the cover when the flexible magnetic disk cassette is installed correctly.
Inventors
- 👤 Akira Tsuji
- 👤 Sadayuki Ito
- 👤 Kazumi Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:05
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/03; G11B23/033; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/03; G11B17/032; G11B23/0014; G11B23/0021; G11B23/0028; G11B23/0035; G11B23/0332
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
236 words
A recording and/or reproducing system comprising: (a) a flexible magnetic disk cassette of the type having a flexible magnetic disk, a cover having a driving hole means for providing access to drive said flexible magnetic disk from outside of said cover, a recording opening means in said cover for exposing a recording surface of said flexible magnetic disk, and a cut-out portion means provided on said cover for detecting correct installation of said flexible magnetic disk cassette into a recording and/or reproducing apparatus, and a shutter means slidably provided on said cover for selectively exposing said recording surface through said recording opening means and exposing said cut-out portion means when said flexible magnetic disk is ready for use; (b) a driving means being engaged with said flexible magnetic disk through said driving hole means of said cover for rotating said flexible magnetic disk; (c) a transducing head means being contacted with said recording surface of said flexible magnetic disk through said recording opening means when said shutter is in an operative position; and (d) a projection means provided in said apparatus in facing relation to said cut-out portion means of said cover for determining when said flexible magnetic disk cassette is installed correctly and for preventing normal installation of the cassette when said shutter means is in an inoperative position and the cut-out portion means is not exposed, said shutter means covering the cut-out portion means.
Claim 2
Dependent Claim
236 words
A recording and/or reproducing system comprising: (a) a flexible magnetic disk cassette of the type having a flexible magnetic disk, a cover having a driving hole means for providing access to drive said flexible magnetic disk from outside of said cover, a recording opening means in said cover for exposing a recording surface of said flexible magnetic disk, and a cut-out portion means provided on said cover for detecting correct installation of said flexible magnetic disk cassette into a recording and/or reproducing apparatus, and a shutter means slidably provided on said cover for selectively exposing said recording surface through said recording opening means and exposing said cut-out portion means when said flexible magnetic disk is ready for use; (b) a driving means being engaged with said flexible magnetic disk through said driving hole means of said cover for rotating said flexible magnetic disk; (c) a transducing head means being contacted with said recording surface of said flexible magnetic disk through said recording opening means when said shutter is in an operative position; and (d) a projection means provided in said apparatus in facing relation to said cut-out portion means of said cover for determining when said flexible magnetic disk cassette is installed correctly and for preventing normal installation of the cassette when said shutter means is in an inoperative position and the cut-out portion means is not exposed, said shutter means covering the cut-out portion means.
Claim 3
Dependent Claim
66 words
A system according to claim 1 wherein said cut-out portion means is provided at an edge of the cover, the shutter means is of a U-shape and formed of opposing plate portions with a central connecting portion which rides along the edge, and wherein said connecting portion is adapted for completely covering said cut-out portion means when the flexible magnetic disk is not ready for use.
Claim 4
Dependent Claim
232 words
A recording and/or reproducing apparatus for a flexible magnetic disk cassette of the type having a flexible magnetic disk; a cover containing said magnetic disk, said cover having a driving hole means for driving said flexible magnetic disk from outside of said cover, a recording opening means for exposing a recording surface of said flexible magnetic disk, and a cut-out portion means provided on one side of said cover for detecting correct installation of said flexible magnetic disk cassette into a recording and/or reproducing apparatus; and a shutter means slidably provided on said cover for selectively exposing said recording surface through said recording opening means and exposing said cut-out portion means when said flexible magnetic disk is ready for use; comprising: (a) a driving means being engaged with said flexible magnetic disk through said driving hole means of said cover for rotating said flexible magnetic disk; (b) a transducing head means being contacted with said recording surface of said flexible magnetic disk through said recording opening means when said shutter means is in an operative position; and (c) a projection means provided in said apparatus in facing relation to said cut-out portion means of said cover for determining when said flexible magnetic disk cassette is installed correctly and for preventing normal installation of the cassette when said shutter means is in an inoperative position and the cut-out portion means is not exposed.
Claim 5
Dependent Claim
232 words
A recording and/or reproducing apparatus for a flexible magnetic disk cassette of the type having a flexible magnetic disk; a cover containing said magnetic disk, said cover having a driving hole means for driving said flexible magnetic disk from outside of said cover, a recording opening means for exposing a recording surface of said flexible magnetic disk, and a cut-out portion means provided on one side of said cover for detecting correct installation of said flexible magnetic disk cassette into a recording and/or reproducing apparatus; and a shutter means slidably provided on said cover for selectively exposing said recording surface through said recording opening means and exposing said cut-out portion means when said flexible magnetic disk is ready for use; comprising: (a) a driving means being engaged with said flexible magnetic disk through said driving hole means of said cover for rotating said flexible magnetic disk; (b) a transducing head means being contacted with said recording surface of said flexible magnetic disk through said recording opening means when said shutter means is in an operative position; and (c) a projection means provided in said apparatus in facing relation to said cut-out portion means of said cover for determining when said flexible magnetic disk cassette is installed correctly and for preventing normal installation of the cassette when said shutter means is in an inoperative position and the cut-out portion means is not exposed.
Claim 6
Dependent Claim
42 words
A recording and/or reproducing apparatus as claimed in claim 3, wherein when said shutter means is in an inoperative position, said shutter means prevents insertion of said projection into said cut-out portion means, and accordingly erroneous operation of said apparatus is prevented.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |