US4030105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique of character generation on magnetic tapes
Assignee: Xerox Corp
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Filing: 1975-09-26
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Granted: 1977-06-14
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Expires: 1995-09-26
Abstract
Abstract A magnetographic printing apparatus is disclosed which uses an electronically generated information stream to produce a visually readable image on a copy output medium. The high speed transfer of input information to the copy medium is accomplished by the direct writing of information pages with a magnetic write head less than the width of a page onto a magnetic buffer web. The latent magnetic image on the buffer web is transferred to a copy web wherein the pages are developed onto the copy medium at speeds approximating the direct writing time.
Inventors
- 👤 Armand P. Neukermans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:28
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/43; G; G03; G03G; G03G19/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
156 words
A direct recording magnetographic system comprising: a magnetic head assembly having multiple integrated recording elements, a buffer web with a magnetizable surface; means, controlling said magnetic head assembly, for directly writing a magnetic latent image onto the surface of the buffer web with multiple passes of said magnetic head assembly; a copy web with a magnetizable surface; means for transferring said magnetic latent image from the magnetic surface of the buffer web to the magnetic surface of the copy web; means for developing said magnetic latent image on the copy web into a visual image; and means for transferring said visual image to a hard copy output medium; wherein the ratio of the width of said magnetic head assembly to the width of said buffer web is substantially equal to the ratio of the magnetic writing speed of said head assembly to the development speed of said development means and transferring speed of said transferring means.
Claim 2
Dependent Claim
156 words
A direct recording magnetographic system comprising: a magnetic head assembly having multiple integrated recording elements, a buffer web with a magnetizable surface; means, controlling said magnetic head assembly, for directly writing a magnetic latent image onto the surface of the buffer web with multiple passes of said magnetic head assembly; a copy web with a magnetizable surface; means for transferring said magnetic latent image from the magnetic surface of the buffer web to the magnetic surface of the copy web; means for developing said magnetic latent image on the copy web into a visual image; and means for transferring said visual image to a hard copy output medium; wherein the ratio of the width of said magnetic head assembly to the width of said buffer web is substantially equal to the ratio of the magnetic writing speed of said head assembly to the development speed of said development means and transferring speed of said transferring means.
Claim 3
Dependent Claim
28 words
A direct recording magnetographic system as defined in claim 1 wherein said transferring means transfer said magnetic latent image from said buffer web to said copy web anhysteretically.
Claim 4
Dependent Claim
47 words
A direct recording magnetographic system as defined in claim 1 wherein the number of said recording elements is a submultiple of the number necessary to write a full width page and a multiple of the number chosen to write one alphanumeric character of said latent magnetic image.
Claim 5
Dependent Claim
28 words
A direct recording magnetographic system as defined in claim 3 wherein said ratio of magnetic head assembly width to buffer web width is greater than 1 to 40.
Claim 6
Dependent Claim
18 words
A direct recording magnetographic system as defined in claim 4 wherein said ratio is approximately 1 to 10.
Claim 7
Dependent Claim
66 words
A direct recording magnetographic system as defined in claim 5 wherein said buffer web width is in the range of 7-9 inches, said magnetic writing speed is approximately 200 in/sec, said developing speed is approximately 20 in/sec, said number of recording elements needed for producing an alphanumeric character is 5, and said number of recording elements necessary to write a full page width is approximately 500.
Claim 8
Dependent Claim
28 words
A direct recording magnetographic system as defined in claim 1 wherein said transferring means transfers said magnetic latent image from said buffer web to said copy web thermoremanently.
Claim 9
Dependent Claim
111 words
A magnetographic imaging method comprising the steps of: forming a directly written magnetic latent image on a buffer web with a magnetic head assembly, transferring said magnetic latent image from the buffer web to a copy web, developing said magnetic latent image on the copy web with magnetic toner, transferring said developed magnetic latent image to a hard copy output medium, wherein the combination of the speed at which the transfer of the magnetic latent image occurs, the speed at which the magnetic latent image is developed, and the speed at which the developed image is transferred is substantially equal to the speed at which the magnetic latent image is formed.
Claim 10
Dependent Claim
111 words
A magnetographic imaging method comprising the steps of: forming a directly written magnetic latent image on a buffer web with a magnetic head assembly, transferring said magnetic latent image from the buffer web to a copy web, developing said magnetic latent image on the copy web with magnetic toner, transferring said developed magnetic latent image to a hard copy output medium, wherein the combination of the speed at which the transfer of the magnetic latent image occurs, the speed at which the magnetic latent image is developed, and the speed at which the developed image is transferred is substantially equal to the speed at which the magnetic latent image is formed.
Claim 11
Dependent Claim
46 words
A magnetographic imaging method as set forth in claim 8 wherein the step of forming said magnetic latent image comprises writing multiple tracks of image information in a page form wherein the width of said magnetic head assembly is less than the width of said page.
Claim 12
Dependent Claim
75 words
A magnetographic imaging method as set forth in claim 9 wherein the step of writing multiple passes comprises: a. recording a track of information the length of the page, with said head assembly, b. retracing the just recorded track without recording, c. moving said head assembly laterally from said just recorded track, and d. recording another track adjacent to the last previously written track, and e. performing steps b-e until the entire page is recorded.
Claim 13
Dependent Claim
72 words
A magnetographic imaging method, as set forth in claim 9 wherein the step of writing multiple passes comprises: a. recording a track of information the length of the page with said head assembly, b. moving said head assembly laterally from the last previously recorded track, c. recording another track adjacent to the last previously recorded track and in the opposite direction, and d. performing step b-c until the entire page is recorded.
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) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |