US4001841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording head array with passive pole
Assignee: Genicom Corp
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Filing: 1975-04-25
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Granted: 1977-01-04
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Expires: 1995-04-25
Abstract
Abstract A recording head array for magnetic printing machines comprises a flat sheet pole spaced from a line of magnetic pin poles. Spaces between image elements recorded by adjacent poles are thereby reduced. The sheet pole may be magnetized to provide a direct current bias field.
Inventors
- 👤 Ami E. Berkowitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:57
CPC Classifications
G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A magnetic recording head array comprising: a flat sheet of magnetic material having a straight edge defining a first pole; a compound second pole comprising a plurality of cores comprising straight pins of magnetic material, one end of each of said pins defining a pin pole, said pins being disposed in a plane forming an acute angle with said sheet and further being, at all points, separated from said sheet to define a gap therebetween, the permeability of said gap being substantially less than the permeability of said magnetic materials, said ends of said pins being further disposed on a straight line lying parallel to said edge of said sheet in a recording plane; and a plurality of conductive windings wrapped on said cores.
Claim 2
Dependent Claim
124 words
A magnetic recording head array comprising: a flat sheet of magnetic material having a straight edge defining a first pole; a compound second pole comprising a plurality of cores comprising straight pins of magnetic material, one end of each of said pins defining a pin pole, said pins being disposed in a plane forming an acute angle with said sheet and further being, at all points, separated from said sheet to define a gap therebetween, the permeability of said gap being substantially less than the permeability of said magnetic materials, said ends of said pins being further disposed on a straight line lying parallel to said edge of said sheet in a recording plane; and a plurality of conductive windings wrapped on said cores.
Claim 3
Dependent Claim
26 words
The array of claim 1 wherein said ends of said pins and said edge of said sheet are coplanar flat surfaces disposed in said recording plane.
Claim 4
Dependent Claim
19 words
The array of claim 2 wherein one of said conductive windings is wrapped on each of said pin cores.
Claim 5
Dependent Claim
11 words
The array of claim 3 wherein said windings comprise insulated wire.
Claim 6
Dependent Claim
15 words
The array of claim 4 wherein said pin cores are disposed parallel, one to another.
Claim 7
Dependent Claim
24 words
The array of claim 5 wherein adjacent pin cores are separated by the sum of the thicknesses of said windings on said adjacent cores.
Claim 8
Dependent Claim
17 words
The array of claim 6 wherein said cores and said windings are encapsulated in a dielectric material.
Claim 9
Dependent Claim
17 words
The array of claim 1 wherein said pin cores are approximately 50% iron and approximately 50% nickel.
Claim 10
Dependent Claim
12 words
The array of claim 1 wherein said sheet comprises a permanent magnet.
Claim 11
Dependent Claim
29 words
The array of claim 1 further comprising a plurality of drive circuit means each of said circuit means being connected in series with one or more of said windings.
Claim 12
Dependent Claim
10 words
The array of claim 1 wherein said sheet comprises permalloy.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |