US3710036A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-crosstalk system for multi-track multiple head device with longitudinally spaced head means, shielding cases for each head means, and an erase head placed between each head means
Assignee: Canon Inc
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Filing: 1970-10-20
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Granted: 1973-01-09
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Expires: 1990-10-20
Abstract
Abstract The magnetic head arrangement of this invention includes a first magnetic head, an erase head, a second magnetic head, a first shielding case to house the first magnetic head and a second shielding case to house the erase head and the second magnetic head. The first recording head faces a first track on a magnetic tape and has the function of reproducing the information stored on that first track. The second magnetic head functions as the recording head and, together with the erase head, faces a second recording track at a position spaced from the first magnetic head with respect to the running direction of the tape. Within the second shielding case the second magnetic head is disposed behind the erase head with respect to the direction of advancing movement of the tape.
Inventors
- 👤 Y Kohtani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:55
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/488; G11B5/4893; G09; G09B; G09B5/00; G09B5/04; G11B5/008; G11B5/00813; G11B5/00817; G11B5/02; G11B5/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
231 words
In a magnetic head system for preventing crosstalk between recording tracks formed on a movable magnetic recording medium, the improvement comprising a first magnetic head having a recording function; a first erase head; a first magnetic shielding case encompassing said first magnetic head and said erase head; means mounting said first magnetic head and said erase head to face a first recording track of the magnetic recording medium wherein said first magnetic head is disposed behind said erase head in the direction of advancing movement of the recording medium; a second magnetic head having a playback function; a second shielding case encompassing said second magnetic head; and means mounting said second magnetic head to face second recording track of the recording medium, wherein said first and second shielding cases are maintained in a fixed relationship providing a spacing therebetween as measured with respect to the direction of movement of the recording medium, and wherein said first case is disposed behind said second case with respect to said direction of movement, whereby leakage flux between said first and second magnetic heads is minimized due to said first and second shielding cases, and due to the placement of said erase head in said first shielding case with said first magnetic head, and the resultant disposition of said erase head between said first and second magnetic heads as viewed in said direction of movement.
Claim 2
Dependent Claim
231 words
In a magnetic head system for preventing crosstalk between recording tracks formed on a movable magnetic recording medium, the improvement comprising a first magnetic head having a recording function; a first erase head; a first magnetic shielding case encompassing said first magnetic head and said erase head; means mounting said first magnetic head and said erase head to face a first recording track of the magnetic recording medium wherein said first magnetic head is disposed behind said erase head in the direction of advancing movement of the recording medium; a second magnetic head having a playback function; a second shielding case encompassing said second magnetic head; and means mounting said second magnetic head to face second recording track of the recording medium, wherein said first and second shielding cases are maintained in a fixed relationship providing a spacing therebetween as measured with respect to the direction of movement of the recording medium, and wherein said first case is disposed behind said second case with respect to said direction of movement, whereby leakage flux between said first and second magnetic heads is minimized due to said first and second shielding cases, and due to the placement of said erase head in said first shielding case with said first magnetic head, and the resultant disposition of said erase head between said first and second magnetic heads as viewed in said direction of movement.
Claim 3
Dependent Claim
67 words
A magnetic head system as set forth in claim 1, in which both of said first and second magnetic heads are record/playback magnetic heads, and further comprising a second erase head disposed within said second shielding case to face the second recording track, wherein said second magnetic head is disposed behind said second erase head with respect to the direction of advancing movement of the recording medium.
Claim 4
Dependent Claim
176 words
A magnetic head system as set forth in claim 2, further comprising a source of signals to be recorded on said first track; a loudspeaker; an erase current generator; a microphone; first switching means for actuation to a first position to couple said source of signals to said loudspeaker and to said first magnetic head for recording signals on said first track, while also connecting said erase current generator to said first erase head, and for actuation to a second position to disconnect said first erase head and to couple said loudspeaker to said first magnetic head for playing back said signals on said first track; and second switching means for actuation to a first position to couple said microphone to said second magnetic head for recording signals on said second track, while also connecting said erase current source to said second erase head, and for actuation to a second position to disconnect said second erase head and to couple said loudspeaker to said second magnetic head for playing back said signals on said second track.
References Cited (Backward Citations)
US3042753A
Cited
US3495337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |