US4803571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floppy disc magnetic head apparatus compatible with both horizontal and perpendicular recording media
Assignee: Toshiba Corp
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Filing: 1987-03-31
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Granted: 1989-02-07
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Expires: 2007-03-31
Abstract
Abstract In a horizontal recording medium, new information can be overwritten upon old information at a low recording density without erasing the medium. In a perpendicular recording medium, on the other hand, new information is recorded at a high recording density after having erased the medium. On the basis of the above features of the horizontal and perpendicular recording mediums with different recording densities, the apparatus comprises first magnetic head with a long gap for the horizontal recording medium, a second magnetic head with a short gap for the perpendicular recording medium, and a heat selector, in order to provide a magnetic recording and reproducing apparatus compatible with both high and low recording density mediums.
Inventors
- 👤 Toshiyuki Fujioka
- 👤 Masahiro Kusunoki
- 👤 Koji Osafune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:04
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B15/00; G11B15/02; G11B15/12; G11B19/00; G11B19/02; G11B5/48; G11B5/488
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A magnetic head apparatus compatible with both horizontal and perpendicular recording media, comprising: (a) first magnetic head means for recording and reproducing information in or from said horizontal recording medium at a first predetermined recording density; (b) second magnetic head means, arranged backward from said first magnetic head means in a magnetic recording medium travel direction, for recording and reproducing information in or from said perpendicular recording medium at a second predetermined recording density higher than that of said horizontal recording medium; and (c) head selecting means for selecting any one of the first and second magnetic head means in response to a signal indicative of the presence of any one of the horizontal and perpendicular recording mediums.
Claim 2
Dependent Claim
118 words
A magnetic head apparatus compatible with both horizontal and perpendicular recording media, comprising: (a) first magnetic head means for recording and reproducing information in or from said horizontal recording medium at a first predetermined recording density; (b) second magnetic head means, arranged backward from said first magnetic head means in a magnetic recording medium travel direction, for recording and reproducing information in or from said perpendicular recording medium at a second predetermined recording density higher than that of said horizontal recording medium; and (c) head selecting means for selecting any one of the first and second magnetic head means in response to a signal indicative of the presence of any one of the horizontal and perpendicular recording mediums.
Claim 3
Dependent Claim
60 words
The magnetic head apparatus as set forth in claim 1, further comprising third magnetic erasing head means, arranged backward from said second magnetic head means in the magnetic recording medium travel direction, for erasing both end portions, of information overwritten horizontal recording medium by any one of said first and second magnetic head means with a different recording density, respectively.
Claim 4
Dependent Claim
63 words
The magnetic head apparatus as set forth in claim 1, further comprising third magnetic erasing head means, arranged frontward of said first magnetic head means in the magnetic recording medium travel,.direction, for erasing old information recorded in the perpendicular recording medium before new information is recorded by any one of said first and second magnetic head means with a different recording density, respectively.
Claim 5
Dependent Claim
247 words
A magnetic head apparatus, compatible with both horizontal and perpendicular recording media, for recording information in and reproducing information from the recording media, comprising: (a) first magnetic head means for recording and reproducing information in or from the horizontal recording medium at a first predetermined recording density; (b) second magnetic head means, arranged backward from said first magnetic head means in a magnetic recording medium travel direction, for recording and reproducing information in or from the perpendicular recording medium at a second predetermined recording density higher than that of said horizontal recording medium; and (c) head selecting means for selecting any one of the first and second magnetic hear means in response to a signal indicative of the presence of any one of the horizontal and perpendicular recording mediums, wherein said third magnetic head means is arranged backward from said second magnetic head means in the magnetic recording medium travel direction and erases both end portions of information overwritten in the horizontal recording medium by said first magnetic head means, both the end portions of information recorded by said first magnetic head means are erased by said third magnetic erasing head means, and when the recording density of said first magnetic head means is lower than that of said second magnetic head means and information is recorded in the perpendicular recording medium by said second magnetic head means, information is first erased by said first magnetic head means and then recorded by said second magnetic head means.
Claim 6
Dependent Claim
247 words
A magnetic head apparatus, compatible with both horizontal and perpendicular recording media, for recording information in and reproducing information from the recording media, comprising: (a) first magnetic head means for recording and reproducing information in or from the horizontal recording medium at a first predetermined recording density; (b) second magnetic head means, arranged backward from said first magnetic head means in a magnetic recording medium travel direction, for recording and reproducing information in or from the perpendicular recording medium at a second predetermined recording density higher than that of said horizontal recording medium; and (c) head selecting means for selecting any one of the first and second magnetic hear means in response to a signal indicative of the presence of any one of the horizontal and perpendicular recording mediums, wherein said third magnetic head means is arranged backward from said second magnetic head means in the magnetic recording medium travel direction and erases both end portions of information overwritten in the horizontal recording medium by said first magnetic head means, both the end portions of information recorded by said first magnetic head means are erased by said third magnetic erasing head means, and when the recording density of said first magnetic head means is lower than that of said second magnetic head means and information is recorded in the perpendicular recording medium by said second magnetic head means, information is first erased by said first magnetic head means and then recorded by said second magnetic head means.
Claim 7
Dependent Claim
33 words
The magnetic head apparatus as set forth in claim 4, wherein said third magnetic erasing head means is arranged backward from said first magnetic head means in the magnetic recording medium travel direction.
Claim 8
Dependent Claim
34 words
The magnetic head apparatus as set forth in claim 4, wherein a track width of information recorded by said first magnetic head means is wider than that recorded by said second magnetic head means.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |