US3852815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of checking the position of a magnetic head relative to a magnetic recording medium and a test magnet recording medium for effecting said method
Assignee: Individual
•
Filing: 1973-04-11
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Granted: 1974-12-03
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Expires: 1993-04-11
Abstract
Abstract A method of checking the position of a magnetic head relative to a magnetic recording medium, wherein two sections of a test signal pattern with mutually displaced recording tracks are recorded on the magnetic recording medium and the correct position of the magnetic head is found by the presence of an output only from that section on which the recording track is located at a minimum allowable distance from the edge of the magnetic recording medium. A test magnetic recording medium exists with magnetic traces corresponding to the test signal pattern, which effects the method.
Inventors
- 👤 G Forshtator
- 👤 Y Shkurovich
- 👤 M Ljudmirsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:08
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/56; G11B5/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
A method of checking the position of a magnetic head relative to a magnetic recording medium, said method comprising the steps of: recording a test signal pattern having two sections with mutually displaced recording tracks on the magnetic recording medium, said tracks being disposed on the magnetic recording medium so that the bottom edge of the recording track of one of the two sections is aligned with the bottom edge of the recording medium and so that the top edge thereof is positioned at a minimum allowable distance a from the top edge of the recording medium, the bottom edge of the recording track of the other section being also aligned with the bottom edge of the magnetic recording medium and the top edge thereof being positioned at a maximum allowable distance b from the top edge of the magnetic recording medium; reproducing successively both sections of the test signal pattern so as to determine the output of the magnetic head; and producing an output only from the section of the test signal pattern whereon the top edge of the recording track is positioned at the minimum allowable distance from the top edge of the magnetic recording medium in order to indicate that the magnetic head is in the required position.
Claim 2
Independent Claim
211 words
A method of checking the position of a magnetic head relative to a magnetic recording medium, said method comprising the steps of: recording a test signal pattern having two sections with mutually displaced recording tracks on the magnetic recording medium, said tracks being disposed on the magnetic recording medium so that the bottom edge of the recording track of one of the two sections is aligned with the bottom edge of the recording medium and so that the top edge thereof is positioned at a minimum allowable distance a from the top edge of the recording medium, the bottom edge of the recording track of the other section being also aligned with the bottom edge of the magnetic recording medium and the top edge thereof being positioned at a maximum allowable distance b from the top edge of the magnetic recording medium; reproducing successively both sections of the test signal pattern so as to determine the output of the magnetic head; and producing an output only from the section of the test signal pattern whereon the top edge of the recording track is positioned at the minimum allowable distance from the top edge of the magnetic recording medium in order to indicate that the magnetic head is in the required position.
Claim 3
Dependent Claim
243 words
A test magnetic recording medium for checking the position of a magnetic head relative thereto, said recording medium comprising: two sections being disposed one after the other in the direction of movement of said magnetic recording medium; a test signal pattern having two mutually displaced signal recording tracks, one of said recording tracks being disposed on one of said two sections so that its bottom edge is aligned with the bottom edge of said magnetic recording medium and so that its top edge is positioned at a minimum allowable distance a from the top edge of said magnetic recording medium, the other said recording track of said two sections being disposed so that its bottom edge is also aligned with the bottom edge of said magnetic recording medium and so that its top edge is positioned at a maximum allowable distance b from the top edge of said magnetic recording medium; magnetic traces carried by both said two sections and corresponding to signals of said test signal pattern; first magnetic traces on one of said two sections, corresponding to the signals of that recording track whose top edge is positioned relative to the top edge of said magnetic recording medium at the minimum allowable distance; and second magnetic traces on the other said two sections, corresponding to the signals of that recording track whose top edge is positioned relative to the top edge of said magnetic recording medium at the maximum allowable distance.
Claim 4
Dependent Claim
243 words
A test magnetic recording medium for checking the position of a magnetic head relative thereto, said recording medium comprising: two sections being disposed one after the other in the direction of movement of said magnetic recording medium; a test signal pattern having two mutually displaced signal recording tracks, one of said recording tracks being disposed on one of said two sections so that its bottom edge is aligned with the bottom edge of said magnetic recording medium and so that its top edge is positioned at a minimum allowable distance a from the top edge of said magnetic recording medium, the other said recording track of said two sections being disposed so that its bottom edge is also aligned with the bottom edge of said magnetic recording medium and so that its top edge is positioned at a maximum allowable distance b from the top edge of said magnetic recording medium; magnetic traces carried by both said two sections and corresponding to signals of said test signal pattern; first magnetic traces on one of said two sections, corresponding to the signals of that recording track whose top edge is positioned relative to the top edge of said magnetic recording medium at the minimum allowable distance; and second magnetic traces on the other said two sections, corresponding to the signals of that recording track whose top edge is positioned relative to the top edge of said magnetic recording medium at the maximum allowable distance.
References Cited (Backward Citations)
DE1120731B
Cited
US3560931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |