US3781489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for aligning magnetic heads in a magnetic disc recorder
Assignee: Arris Technology Inc
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Filing: 1972-08-02
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Granted: 1973-12-25
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Expires: 1992-08-02
Abstract
Abstract A method and apparatus for accurately aligning a plurality of magnetic heads in a magnetic disc recorder and reproducer, including the use of a transparent disc member having radial lines arranged around a central opening of the disc member, and having lines perpendicular to the radial lines also arranged around the central opening, and with the combination of the radial lines and the lines perpendicular to the radial lines forming locations for the alignment of the magnetic heads, and with the magnetic heads divided into groups supported in comb members accurately located to properly position the magnetic heads in a group relative to each other and to provide the air gaps of such group of magnetic heads to be along a straight line and with each comb member supported by a mounting means and with the transparent disc member including openings located adjacent to the radial lines to provide access to the mounting means to provide for the proper alignment of the groups of magnetic heads.
Inventors
- 👤 A Brand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:36
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/4806; G11B5/4813
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
237 words
A method of aligning a plurality of magnetic heads in a magnetic disc recorder-reproducer to accurately read and write information in a plurality of tracks on magnetic discs so that the magnetic discs may be interchangeable and with the magnetic heads formed in groups arranged in radial positions around a center spindle of the magnetic disc recorder and reproducer and with the method of aligning using a transparent disc member having a plurality of radial lines arranged around a center opening of the transparent disc member and having a plurality of lines perpendicular to the radial lines and with the combination of the radial lines and the lines perpendicular to the radial lines forming locations for the groups of magnetic heads and with the method of aligning including the following steps, placing the center opening of the transparent disc member over the center spindle to position the transparent disc member in a plane parallel to the plurality of magnetic heads, locking the transparent disc member in a predetermined location to position the lines on the disc relative to the plurality of magnetic heads so that each group of magnetic heads is adjacent to a set of lines including at least one radial line and one line perpendicular to the radial line, and aligning each group of magnetic heads in relation to a set of lines to align the plurality of magnetic heads in relation to each other.
Claim 2
Independent Claim
237 words
A method of aligning a plurality of magnetic heads in a magnetic disc recorder-reproducer to accurately read and write information in a plurality of tracks on magnetic discs so that the magnetic discs may be interchangeable and with the magnetic heads formed in groups arranged in radial positions around a center spindle of the magnetic disc recorder and reproducer and with the method of aligning using a transparent disc member having a plurality of radial lines arranged around a center opening of the transparent disc member and having a plurality of lines perpendicular to the radial lines and with the combination of the radial lines and the lines perpendicular to the radial lines forming locations for the groups of magnetic heads and with the method of aligning including the following steps, placing the center opening of the transparent disc member over the center spindle to position the transparent disc member in a plane parallel to the plurality of magnetic heads, locking the transparent disc member in a predetermined location to position the lines on the disc relative to the plurality of magnetic heads so that each group of magnetic heads is adjacent to a set of lines including at least one radial line and one line perpendicular to the radial line, and aligning each group of magnetic heads in relation to a set of lines to align the plurality of magnetic heads in relation to each other.
Claim 3
Dependent Claim
55 words
method of claim 1 wherein each set of lines includes two radial lines spaced apart by a distance equal to the maximum alignment error allowable in the magnetic disc recorder and reproducer and with the step of aligning including positioning of the air gaps of each group of magnetic heads between the two radial lines.
Claim 4
Dependent Claim
49 words
The method of claim 1 wherein each group of magnetic heads is supported in a comb member and with the step of aligning including positioning an edge portion of the outermost magnetic head in a comb member to be in alignment with the line perpendicular to the radial line.
Claim 5
Dependent Claim
46 words
The method of claim 1 wherein the transparent disc includes a locking opening extending therethrough and the magnetic disc recorder and reproducer includes a corresponding locking opening and with the step of locking including the use of a locking means passing into the two locking openings.
Claim 6
Independent Claim
198 words
A method of aligning a plurality of magnetic heads at radial positions around a central position, including the following steps locating the plurality of magnetic heads of individual radial positions and with such location providing a rough adjustment of the relative position of the magnetic heads at the radial positions, providing a transparent disc member having a plurality of radial lines located around a central position and having lines perpendicular to the radial lines and with the combination of radial lines and lines perpendicular to the radial lines providing a fine adjustment of the relative positions of the magnetic heads at the radial positions, placing the transparent disc member adjacent the plurality of magnetic heads so that the central position of the transparent disc and the plurality of magnetic heads is located along a common axis and so that the combinations of radial line and lines perpendicular to the radial lines are adjacent to the plurality Of magnetic heads, and aligning the plurality of magnetic heads in relation to the combinations of radial lines and lines perpendicular to the radial lines to provide a fine adjustment of the relative positions of the magnetic heads at the radial positions.
Claim 7
Independent Claim
198 words
A method of aligning a plurality of magnetic heads at radial positions around a central position, including the following steps locating the plurality of magnetic heads of individual radial positions and with such location providing a rough adjustment of the relative position of the magnetic heads at the radial positions, providing a transparent disc member having a plurality of radial lines located around a central position and having lines perpendicular to the radial lines and with the combination of radial lines and lines perpendicular to the radial lines providing a fine adjustment of the relative positions of the magnetic heads at the radial positions, placing the transparent disc member adjacent the plurality of magnetic heads so that the central position of the transparent disc and the plurality of magnetic heads is located along a common axis and so that the combinations of radial line and lines perpendicular to the radial lines are adjacent to the plurality Of magnetic heads, and aligning the plurality of magnetic heads in relation to the combinations of radial lines and lines perpendicular to the radial lines to provide a fine adjustment of the relative positions of the magnetic heads at the radial positions.
Claim 8
Dependent Claim
65 words
The method of claim 5 wherein the radial lines are formed in closely spaced groups of at least two radial lines and with such spacing equal to the maximum allowable alignment error for the plurality of magnetic heads and with the step of aligning including the positioning of a portion of individual ones of the magnetic heads between the two radial lines of a group.
Claim 9
Dependent Claim
61 words
The method of claim 5 wherein the plurality of magnetic heads is divided into groups with each group supported in a comb member and with the step of aligning including positioning an edge portion of each of the outermost magnetic heads in a comb member to be in alignment with an individual one of the lines perpendicular to the radial lines.
Claim 10
Dependent Claim
40 words
The method of claim 5 wherein the transparent disc includes a locking opening and with an additional step of locking the transparent disc in position adjacent the plurality of magnetic heads using a locking member passing through the locking opening.
Claim 11
Dependent Claim
160 words
An alignment tool for use in aligning a plurality of magnetic heads in a magnetic disc recorder and reproducer wherein the magnetic heads are formed in groups arranged in radial positions around a center spindle of the magnetic disc recorder and reproducer, and with the alignment tool including a transparent disc member having a central opening for positioning the disc member on the center spindle of the magnetic disc recorder and reproducer, a plurality of radial lines arranged around the central opening of the transparent disc member, a plurality of lines perpendicular to the radial lines and with the lines perpendicular to the radial lines also arranged around the central opening of the transparent disc member, and the combination of the plurality of radial lines and the plurality of lines perpendicular to the radial lines forming locations for the positioning of the groups of magnetic heads for providing an alignment of the relative position of the groups of magnetic heads.
Claim 12
Dependent Claim
160 words
An alignment tool for use in aligning a plurality of magnetic heads in a magnetic disc recorder and reproducer wherein the magnetic heads are formed in groups arranged in radial positions around a center spindle of the magnetic disc recorder and reproducer, and with the alignment tool including a transparent disc member having a central opening for positioning the disc member on the center spindle of the magnetic disc recorder and reproducer, a plurality of radial lines arranged around the central opening of the transparent disc member, a plurality of lines perpendicular to the radial lines and with the lines perpendicular to the radial lines also arranged around the central opening of the transparent disc member, and the combination of the plurality of radial lines and the plurality of lines perpendicular to the radial lines forming locations for the positioning of the groups of magnetic heads for providing an alignment of the relative position of the groups of magnetic heads.
Claim 13
Dependent Claim
38 words
The alignment tool of claim 9 wherein the radial lines are formed in groups of at least two radial lines spaced apart by a distance equal to the maximum allowable alignment error for the groups of magnetic heads.
Claim 14
Dependent Claim
61 words
The alignment tool of claim 9 wherein the magnetic disc recorder and reproducer includes an opening used for locking the transparent disc and additionally including a locking opening in the transparent disc for providing a locking of the transparent disc member by a locking member passing into the locking openings of the transparent disc and the magnetic disc recorder and reproducer.
Claim 15
Dependent Claim
59 words
The alignment tool of claim 9 wherein the groups of magnetic heads are supported by mounting means and the transparent disc member includes a plurality of openings located radially around the central opening and positioned adjacent to the radial lines for providing access to the mounting means for the groups of magnetic heads for alignment of the magnetic heads.
Claim 16
Dependent Claim
117 words
A magnetic disc recording and reproducing system including an alignment tool including a plurality of magnetic heads formed in groups and arranged in radial positions around a central spindle, and a disc member having a central opening and with the central opening of the disc member positioned on the center spindle and with the disc member having a plurality of radial lines arranged around the central opening and a plurality of lines perpendicular to the radial lines also arranged around the central opening and with the combination of radial lines and lines perpendicular to the radial lines forming locations for positioning the groups of magnetic heads to align the groups of magnetic heads relative to each other.
Claim 17
Dependent Claim
117 words
A magnetic disc recording and reproducing system including an alignment tool including a plurality of magnetic heads formed in groups and arranged in radial positions around a central spindle, and a disc member having a central opening and with the central opening of the disc member positioned on the center spindle and with the disc member having a plurality of radial lines arranged around the central opening and a plurality of lines perpendicular to the radial lines also arranged around the central opening and with the combination of radial lines and lines perpendicular to the radial lines forming locations for positioning the groups of magnetic heads to align the groups of magnetic heads relative to each other.
Claim 18
Dependent Claim
76 words
The system of claim 13 additionally including cOmb members each having a plurality of slots for receiving one group of magnetic heads and with each slot receiving a magnetic head and with the depth of each slot accurately machined to provide an alignment of the air gaps of the group of magnetic heads and with the individual magnetic heads located accurately in an assembly tool to accurately position the magnetic heads in relation to each other.
Claim 19
Dependent Claim
37 words
The system of claim 13 wherein the radial lines are formed in groups of at least two radial lines spaced apart by a distance equal to the maximum allowable alignment error for the groups of magnetic heads.
Claim 20
Dependent Claim
59 words
The system of claim 13 wherein the magnetic disc recorder and reproducer includes an opening used for locking the disc member and additionally including a locking opening in the disc member for providing a locking of the disc member by a locking member passing into the locking openings of the disc member and the magnetic disc recorder and reproducer.
Claim 21
Dependent Claim
57 words
The system of claim 13 wherein the groups of magnetic heads are supported by mounting means and the disc member includes a plurality of openings located radially around the central opening and positioned adjacent to the radial lines for providing access to the mounting means for the groups of magnetic heads for alignment of the magnetic heads.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |