Patent US1417651A successfully refreshed from Google Patents.
US3585590A
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Sensing circuit for apparatus for automatic character recognition
Assignee: US Philips Corp
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Filing: 1967-12-05
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Granted: 1971-06-15
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Expires: 1987-12-05
Abstract
Abstract A photoelectric sensing device for providing cyclical indicators of interrogation points in accordance with the width of a sensed character area is constructed with a counter which indicates the first point at the beginning of the first vertical character line of a character, thereby beginning to cycle at a first frequency. At the end of the line, the counter begins again at double the rate. The counter then cycles once between each pair of interrogation points, and the number of zeros emitted by the counter signifies the number of interrogation points.
Inventors
- 👤 Hans Hoffman
- 👤 Dieter Poddig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:26
CPC Classifications
G; G06; G06V; G06V10/00; G06V10/10
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
A sensing circuit for use in automatic character recognition of characters of a type style with predominantly vertical and horizontal line elements and a plurality of vertical interrogation points positioned at spaced distances along said character, comprising a ring counter having a predetermined capacity, a first source of pulses of a first rate, a second source of pulses of a second rate which is double said first rate, means responsive to a first vertical line element of a character for introducing said first pulse source to said counter and to the next vertical line element of said character for switching said second pulse source to said counter, means for cycling said counter through zero at said second rate between respective successive interrogation points after said next vertical line element thereby indicating interrogation instants succeeding the first interrogation.
Claim 2
Dependent Claim
137 words
A sensing circuit for use in automatic character recognition of characters of a type style with predominantly vertical and horizontal line elements and a plurality of vertical interrogation points positioned at spaced distances along said character, comprising a ring counter having a predetermined capacity, a first source of pulses of a first rate, a second source of pulses of a second rate which is double said first rate, means responsive to a first vertical line element of a character for introducing said first pulse source to said counter and to the next vertical line element of said character for switching said second pulse source to said counter, means for cycling said counter through zero at said second rate between respective successive interrogation points after said next vertical line element thereby indicating interrogation instants succeeding the first interrogation.
Claim 3
Dependent Claim
85 words
The combination of claim 1 wherein said circuit includes an OR member coupling said second source of pulses to said counter from a first AND member and said first source of pulses to said counter from a second AND member, first and second bistable triggers each having first and second conditions in response to said first and second vertical line elements, said first and second conditions respectively energizing said first and second AND members for coupling said first and second pulse sources to said counter.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |