US4009467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Character reader
Assignee: Fujitsu Ltd
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Filing: 1975-09-18
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Granted: 1977-02-22
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Expires: 1995-09-18
Abstract
Abstract A character reader recognizes characters by scanning them in lines corresponding to line marks, after detecting the line marks. The line marks are recorded corresponding to lines on a sheet where characters are recorded. Only a character detection signal related to a scanning signal within the domain determined by the line mark is extracted from scanning signals of the recorded characters.
Inventors
- 👤 Tsuguo Kodera
- 👤 Kiyokazu Hanatani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:15
CPC Classifications
G; G06; G06V; G06V30/00; G06V30/10; G06V30/14; G06V30/146
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
227 words
A character reader for recognizing characters recorded in equidistantly spaced lines on a sheet, each of the lines having a line mark recorded thereat, said character reader having scanning means positioned for scanning the lines of the sheet having characters recorded therein, said scanning means producing a scanning output signal, and recognition means for recognizing the recorded line mark in the scanning output signal produced by the scanning means for each line having characters recorded therein, said recognition means detecting the line marks and recognizing the characters in the lines corresponding to the line marks via the scanning output signal, said character reader comprising positioning means for positioning the scanning means at a distance above a line being scanned sufficient to provide a scanning range between the upper and lower scanning limits of a line of characters relative to a center line through such line, said scanning range being greater than the distance between next-adjacent lines; position detecting means for detecting where the line mark is located in the scanning range via the recognition means; and extraction means for extracting the scanning output signal of the scanning means only when said scanning means scans within specified areas including the reference positions provided by the line marks detected by the position detecting means, said recognition means recognizing characters by recognizing the scanning output signal of the extraction means.
Claim 2
Dependent Claim
227 words
A character reader for recognizing characters recorded in equidistantly spaced lines on a sheet, each of the lines having a line mark recorded thereat, said character reader having scanning means positioned for scanning the lines of the sheet having characters recorded therein, said scanning means producing a scanning output signal, and recognition means for recognizing the recorded line mark in the scanning output signal produced by the scanning means for each line having characters recorded therein, said recognition means detecting the line marks and recognizing the characters in the lines corresponding to the line marks via the scanning output signal, said character reader comprising positioning means for positioning the scanning means at a distance above a line being scanned sufficient to provide a scanning range between the upper and lower scanning limits of a line of characters relative to a center line through such line, said scanning range being greater than the distance between next-adjacent lines; position detecting means for detecting where the line mark is located in the scanning range via the recognition means; and extraction means for extracting the scanning output signal of the scanning means only when said scanning means scans within specified areas including the reference positions provided by the line marks detected by the position detecting means, said recognition means recognizing characters by recognizing the scanning output signal of the extraction means.
Claim 3
Dependent Claim
128 words
A character reader as claimed in claim 1, further comprising shift out means for supplying a shift out pulse, and wherein the position detecting means produces a position signal in accordance with the location of the line mark, the position signal being made a negative value and advancing by +1 each time a shift out pulse is provided, counting means for producing a counting result, and gate means coupled between the counting means and the recognition means, said gate means becoming conductive when said counting means produces a counting result of a first predetermined value and becoming non-conductive when said counting means produces a counting result of a second predetermined value thereby controlling the transfer of the scanning output signal from the scanning means to the recognition means.
References Cited (Backward Citations)
US3528059A
Cited
US3337766A
Cited
US3408458A
Cited
US3458688A
Cited
US3624607A
Cited
US3820067A
Cited
US3810094A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-22 | 1980-08-23 | 1981-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-22 | 1984-08-23 | 1985-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-22 | 1988-08-23 | 1989-02-22 | $7700.00 | Window Closed / Lapsed |