US3903594A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making electrographic recording heads employing printed circuit techniques
Assignee: Gould Inc
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Filing: 1974-05-28
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Granted: 1975-09-09
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Expires: 1994-05-28
Abstract
Abstract Electrographic recording heads are fabricated using printed circuit techniques. A head with two parallel rows of recording electrode areas is constructed by forming two confronting rows of electrode conductors on one face of a thin substrate. The substrate then is folded and secured together substrate-tosubstrate so that there is a row of conductors on each face of the folded structure. The structure then is severed across the conductors adjacent to the fold, exposing a cross sectional area of each conductor thus establishing two rows of recording electrode areas, with the rows separated by the thickness of two layers of substrate material. A head with a single row of closely spaced electrode areas is constructed in similar fashion except that the substrate is folded conductors-toward-conductors. The conductors of the two rows are dimensioned and located so that the conductors of one row interleave between the conductors of the other row. Thus, when the portion adjacent to the fold is severed, there is exposed a single row of recording electrode areas which may have very close spacing. Prior to folding the substrate, selected electrode conductors are interconnected by printed circuit techniques. Front shoe complementary electrodes are formed on separate substrate.
Inventors
- 👤 Donald J Koneval
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:07
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/385; B41J2/39; B41J2/40; B41J2/395; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49165; Y10T29/4957
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
241 words
The method of fabricating an electrographic recording head having at least one row of recording electrode areas which comprises: on a sheet of flexible circuit board material comprising a substrate of insulative material, defining by means of parallel severance lines and elongated rectangular expendable portion, and first and second electrode conductor supporting portions flanking said expendable portion; forming on said first conductor supporting portion a first row of electrode conductors; and forming on said second conductor supporting portion a second row of electrode conductors; each of said conductors of said first and second rows being formed on the same face of said sheet of material, and extending across the adjacent one of said severance lines and at least partially over said expendable portion; folding said sheet with the bend of said fold located along the center of said expendable portion thereby bringing into close proximity to each other areas of said first and second electrode supporting portions which are adjacent to said expendable portion, and also bringing into close proximity to each other areas of said expendable portion which are adjacent to said conductor supporting portions; securing together said areas which are in close proximity to each other; and severing said expendable portion, including the extensions thereover of said electrode conductors, from said secured together areas of said first and second conductor supporting portions, thereby exposing a cross sectional area of each of said conductors to establish said recording electrode areas.
Claim 2
Independent Claim
241 words
The method of fabricating an electrographic recording head having at least one row of recording electrode areas which comprises: on a sheet of flexible circuit board material comprising a substrate of insulative material, defining by means of parallel severance lines and elongated rectangular expendable portion, and first and second electrode conductor supporting portions flanking said expendable portion; forming on said first conductor supporting portion a first row of electrode conductors; and forming on said second conductor supporting portion a second row of electrode conductors; each of said conductors of said first and second rows being formed on the same face of said sheet of material, and extending across the adjacent one of said severance lines and at least partially over said expendable portion; folding said sheet with the bend of said fold located along the center of said expendable portion thereby bringing into close proximity to each other areas of said first and second electrode supporting portions which are adjacent to said expendable portion, and also bringing into close proximity to each other areas of said expendable portion which are adjacent to said conductor supporting portions; securing together said areas which are in close proximity to each other; and severing said expendable portion, including the extensions thereover of said electrode conductors, from said secured together areas of said first and second conductor supporting portions, thereby exposing a cross sectional area of each of said conductors to establish said recording electrode areas.
Claim 3
Dependent Claim
28 words
The method described in claim 1 in which all of said conductors of said first row and of said second row have equal widths and are equally spaced.
Claim 4
Dependent Claim
49 words
The method described in claim 2 in which said sheet is folded substrate-toward-substrate so that said electrode conductors are exposed, and separated by at least twice the thickness of said substrate material, whereby there are formed, by severing of said expendable portion, two parallel rows of recording electrode areas.
Claim 5
Dependent Claim
71 words
The method described in claim 2 in which the spaces between adjacent conductors are wider than said conductors, and in which said sheet is folded conductors-toward-conductors, said conductors being so located that the conductors of said first row interleave between the conductors of said second row in an area adjacent to said expendable portion whereby there is formed, by severing said expendable portion, a single row of closely spaced electrode areas.
Claim 6
Dependent Claim
53 words
The method described in claim 1 in which conductors of said first row are joined on said expendable portion to conductors of said second row, and including the step of removing a strip of substrate material from the center of said expendable portion along the full length thereof prior to folding said sheet.
Claim 7
Dependent Claim
28 words
The method described in claim 5 in which all of said conductors of said first row and of said second row have equal widths and are equally spaced.
Claim 8
Dependent Claim
47 words
The method described in claim 6 in which said sheet is folded substrate-toward-substrate so that said electrode conductors are exposed and separated by at least twice the thickness of said substrate material, whereby therE are formed, by severing said expendable portion, two parallel rows of recording electrodes.
Claim 9
Dependent Claim
71 words
The method described in claim 6 in which the spaces between adjacent conductors are wider than said conductors, and in which said sheet is folded conductors-toward-conductors, said conductors being so located that the conductors of said first row interleave between the conductors of said second row in an area adjacent to said expendable portion whereby there is formed, by severing said expendable portion, a single row of closely spaced electrode areas.
Claim 10
Dependent Claim
88 words
The method described in claim 6 in which said sheet is folded conductors-toward-conductors, said conductors being so located that each conductor in said first row lies in face to face contact with a conductor in said second row in an area adjacent to said expendable portion whereby there is formed, by severing said expendable portion, a single row of electrode areas, each area comprising a cross sectional area of a conductor of said first row contiguous to a cross sectional area of a conductor of said second row.
Claim 11
Dependent Claim
112 words
The method described in claim 1 which includes, prior to folding said sheet, the further steps of: applying a photo-resist film to the face of said sheet over said electrode conductors; photo-etching openings through said film in a plurality of rows parallel to the length of said elongated expendable portion, with each opening in register with a different one of said electrode conductors; forming over said photo-resist film a plurality of conductors, each conductor lying directly over a different one of said rows of openings and extending through each of said openings in said row and making electrical contact with the electrode conductor which is in register with each of said openings.
Claim 12
Dependent Claim
115 words
The method described in claim 1 which includes, prior to folding said sheet, the further steps of: applying a first photo-resist film to the face of said sheet over said electrode conductors; photo-etching openings through said film in a plurality of rows parallel to the length of said elongated expendable portion, with each opening in register with a different one of said electrode conductors; applying a second photo-resist film over said first film; photo-etching a plurality of channels through said second film, each channel lying directly over one of said rows of openings and thereby communicating with all of the openings of said row; and filling said channels and said openings with electrical conductive material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |