Patent US4123791A successfully refreshed from Google Patents.
US4123791A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic transducer device with outrigger bars
Assignee: BASF SE
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Filing: 1977-12-19
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Granted: 1978-10-31
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Expires: 1997-12-19
Abstract
Abstract A magnetic transducer device for maintaining improved recording tape to transducer head contact at reduced contact pressure. A pair of vertical outrigger bars are mounted on either side of the transducer head transverse to the path of the recording tape. The surfaces of the vertical bars facing the recording tape are located slightly below the plane of the outer surface of the transducer head thereby maintaining a constant, shallow wrap angle of the recording tape over the transducer head. Furthermore, a second pair of horizontal outrigger bars are mounted on either side of and adjacent to the transducer head along an axis transverse to the path of the recording tape. The surfaces of these horizontal bars facing the recording tape are located in substantially the same plane as the outer surface of the transducer head, thereby providing support for the recording tape when the transducer head is positioned near the edge of the tape and preventing the edge of the tape from lifting from the head due to its upward flex curvature.
Inventors
- 👤 Gerhard Rotter
- 👤 Alojzy Bakowski
- 👤 Donald L. Burdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:46
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/60; G11B15/62; G11B5/00; G11B5/10; G11B5/105; G11B5/48
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
201 words
In a magnetic transducer assembly of the type wherein a magnetic recording tape is transported under tension along a path extending over the transducing face of a magnetic head, the plane of which protrudes into the magnetic surface of said recording tape causing it to wrap over said magnetic head at an angle as the recording tape approaches and departs said transducing face, the improvement comprising: a pair of outrigger bars mounted on the transducer assembly transverse to the path along which the recording tape is transported, each of said transverse outrigger bars being spaced from the magnetic head on opposite sides thereof and each of said transverse outrigger bars having an outer surface formed thereon facing the magnetic surface of said recording tape, the plane extending between said outer surfaces being located at a predetermined level below the plane of the transducing face of said magnetic head, whereby the wrap angle at which said recording tape passes over said transducing face is maintained at a constant, shallow value regardless of slight misalignments of the magnetic transducer assembly with respect to said recording tape path thereby inhibiting undesirable tape fly over and wear of the transducing face of said magnetic head.
Claim 2
Dependent Claim
201 words
In a magnetic transducer assembly of the type wherein a magnetic recording tape is transported under tension along a path extending over the transducing face of a magnetic head, the plane of which protrudes into the magnetic surface of said recording tape causing it to wrap over said magnetic head at an angle as the recording tape approaches and departs said transducing face, the improvement comprising: a pair of outrigger bars mounted on the transducer assembly transverse to the path along which the recording tape is transported, each of said transverse outrigger bars being spaced from the magnetic head on opposite sides thereof and each of said transverse outrigger bars having an outer surface formed thereon facing the magnetic surface of said recording tape, the plane extending between said outer surfaces being located at a predetermined level below the plane of the transducing face of said magnetic head, whereby the wrap angle at which said recording tape passes over said transducing face is maintained at a constant, shallow value regardless of slight misalignments of the magnetic transducer assembly with respect to said recording tape path thereby inhibiting undesirable tape fly over and wear of the transducing face of said magnetic head.
Claim 3
Dependent Claim
160 words
The transducer assembly of claim 1 further comprising a pair of outrigger bars mounted on the transducer assembly parallel to the path along which the recording tape is transported, each of said parallel outrigger bars being spaced from the magnetic head on opposite sides thereof substantially along an axis transverse to said recording tape path extending through the transducing face of said magnetic head and each of said parallel outrigger bars having an outer surface formed thereon facing the magnetic surface of said recording tape which is of substantially the same length as the transducing face of said magnetic head, the plane extending between said outer surfaces being located substantially in the same plane as the transducing face of said magnetic head, whereby said parallel outrigger bars partially support said recording tape as it is transported over said transducing face thereby reducing the contact pressure therebetween and preventing the edges of said recording tape from lifting from said transducing face.
Claim 4
Dependent Claim
49 words
The transducer assembly of claim 1 wherein said magnetic head has steps formed along each of its sides transverse to the path along which the recording tape is transported, the side surfaces of said steps forming sharp edges at their intersection with the transducing surface of said magnetic head.
Claim 5
Dependent Claim
38 words
The transducer assembly of claim 1 wherein said outer surfaces of the transverse outrigger bars facing the magnetic surface of said recording tape are formed with a relatively large radius of curvature sufficient to induce tape fly thereover.
Claim 6
Dependent Claim
32 words
The transducer assemby of claim 1 further comprising an erase head mounted in one of said outer surfaces of the transverse outrigger bars which faces the magnetic surface of said recording tape.
Claim 7
Dependent Claim
46 words
The transducer assembly of claim 1 further comprising a pair of erase heads, each of said erase heads being located on opposite sides of said magnetic head and mounted in said outer surfaces of the transverse outrigger bars facing the magnetic surface of said recording tape.
Claim 8
Dependent Claim
204 words
In a magnetic transducer assembly of the type wherein a magnetic recording tape is transported under tension along a path extending over the transducing face of a magnetic head, the plane of which protrudes into the magnetic surface of said recording tape, the improvement comprising: a pair of outrigger bars mounted on the transducer assembly parallel to the path along which the recording tape is transported, each of said parallel outrigger bars being spaced from the magnetic head on opposite sides thereof substantially along an axis transverse to said recording tape path extending through the transducing face of said magnetic head and each of said parallel outrigger bars having an outer surface formed thereon facing the magnetic surface of said recording tape which is of substantially the same length as the transducing face of said magnetic head, the plane extending between said outer surfaces being located substantially in the same plane as the transducing face of said magnetic head, whereby said parallel outrigger bars partially support said recording tape as it is transported over said transducing face thereby reducing the contact pressure therebetween and preventing the edges of said recording tape from lifting from said transducing face as the magnetic head approaches said edges.
Claim 9
Dependent Claim
204 words
In a magnetic transducer assembly of the type wherein a magnetic recording tape is transported under tension along a path extending over the transducing face of a magnetic head, the plane of which protrudes into the magnetic surface of said recording tape, the improvement comprising: a pair of outrigger bars mounted on the transducer assembly parallel to the path along which the recording tape is transported, each of said parallel outrigger bars being spaced from the magnetic head on opposite sides thereof substantially along an axis transverse to said recording tape path extending through the transducing face of said magnetic head and each of said parallel outrigger bars having an outer surface formed thereon facing the magnetic surface of said recording tape which is of substantially the same length as the transducing face of said magnetic head, the plane extending between said outer surfaces being located substantially in the same plane as the transducing face of said magnetic head, whereby said parallel outrigger bars partially support said recording tape as it is transported over said transducing face thereby reducing the contact pressure therebetween and preventing the edges of said recording tape from lifting from said transducing face as the magnetic head approaches said edges.
Claim 10
Dependent Claim
39 words
The transducer assembly of claim 7 wherein the outer surfaces of said parallel outrigger bars facing the magnetic surface of said recording tape are formed with substantially the same physical shape as the transducing face of said magnetic head.
Claim 11
Dependent Claim
38 words
The transducer assembly of claim 7 wherein the outer surfaces of said parallel outrigger bars facing the magnetic surface of said recording tape are constructed of substantially the same material as the transducing face of said magnetic head.
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) | 1981-10-30 | 1982-05-01 | 1982-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-30 | 1986-05-01 | 1986-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-30 | 1990-05-01 | 1990-10-31 | $7700.00 | Window Closed / Lapsed |