Precision cathode ray tube scanner with reference grid network
Abstract
Abstract A CATHODE RAY TUBE WITH A LIGHT EMITTING COATING ON ITS FACE IS ILLUMINATED BY AN ELECTRON BEAM SELECTIVELY CONTROLLED TO SCAN ANY DESIRED PATTERN ON THE FACE OF THE CATHODE RAY TUBE, A DOCUMENT DISPOSED IN THE PATH OF THE LIGHT EMITTED FROM THE FACE OF THE CRT, A LIGHT RESPONSIVE DEVICE RESPONSIVE TO LIGHT PASSING THROUGH THE DOCUMENT TO DETECT A CHANGE IN LIGHT INTENSITY THEREBY TO INDICATE THAT A POINT ON THE CHARACTER HAS BEEN DETECTED, AN OPAQUE GRID PATTERN DISPOSED ON THE INNER FACE OF THE CATHODE RAY TUBE, ANOTHER LIGHT RESPONSIVE DEVICE DISPOSED TO RECEIVE LIGHT DIRECTLY FROM THE LIGHT EMITTING FACE OF THE CATHODE RAY TUBE AND SENSE CHANGES OF INTENSITY CREATED AS THE ELECTRON BEAM CROSSES ANY SEGMENT OF THE OPAQUE GRID PATTERN, AND CIRCUIT MEANS RESPONSIVE TO THE FIRST AND SECOND LIGHT RESPONSIVE DEVICES TO PROVIDE SIGNALS WHICH ARE USED TO LOCATE A DETECTED POINT ON A CHARACTER WITH RESPECT TO THE GRID PATTERN.
Inventors
- 👤 Richard G Gray
Bibliographic Details
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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) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |