US3560782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube with phosphor and scatophor layers in screen
Assignee: ANACOMP Inc 11550 NORTH MERIDAN STREET CARMEL INDIANA 46032 A CORP OF INDIANA
•
Filing: 1968-08-28
•
Granted: 1971-02-02
•
Expires: 1988-08-28
Abstract
Abstract A cathode ray tube is described comprising a target screen including a transparent conductive layer, a scotophor layer, and a luminescent layer. A first electron beam is directed at the target screen with sufficient energy to darken preselected areas of the scotophor layer. Such areas are made visible by flooding the luminescent layer with a second electron beam of lower energy. Selected areas also may be further brightened by selectively operating the first beam at an energy level insufficient to darken the scotophor.
Inventors
- 👤 Omer F Hamann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:30
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/122; H01J29/00; H01J29/02; H01J29/10; H01J29/14; H01J29/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
46 words
A cathode ray tube according to claim 1 wherein said electron beam-directing means include means for directing an electron beam at the target screen to brighten selected areas of said luminescent layer to a substantially greater level of brightness than that produced by said flooding means.
Claim 2
Dependent Claim
20 words
A cathode ray tube according to claim 1 wherein said luminescent layer is of a material having relatively long persistency.
Claim 3
Dependent Claim
35 words
A cathode ray tube according to claim 1 including a transparent layer in thermal proximity to said scotophor layer, and means for heating said transparent layer to render darkened areas of said scotophor layer transparent.
Claim 4
Dependent Claim
30 words
A cathode ray tube according to claim 4, wherein said transparent layer is electrically conductive and said heating means comprise means for passing an electric current through said transparent layer.
Claim 5
Dependent Claim
54 words
A cathode ray tube according to claim 1, including means to selectively reduce the energy of the first electron beam to a level insufficient to darken said scotophor layer but sufficient to brighten selected areas of said luminescent layer to a substantially greater level of brightness than that produced by the second electron beam.
Claim 6
Independent Claim
111 words
A method of using a dark trace storage tube having a target screen comprised of a scotophor layer and an adjacent layer of luminescent material capable of luminescing at a lower energy level than the energy level at which darkening of the scotophor layer occurs, said method comprising, directing an electron beam at the target screen of sufficient energy to darken selected areas of the scotophor layer to store information thereon, and subsequently flooding the luminescent layer with at least one electron beam of sufficient energy to visibly define the darkened areas of said scotophor layer without darkening additional areas of said scotophor layer to thereby read out the stored information.
Claim 7
Dependent Claim
29 words
A method according to claim 7 wherein the electron beam used to flood the luminescent layer is distinct from that used to darken selected areas of the scotophor layer.
Claim 8
Dependent Claim
78 words
A method according to claim 8 wherein the energy of the electron beam which is used to darken selected areas of the scotophor layer is intermittently attenuated to an energy level which is below that necessary to darken areas of the scotophor layer, but sufficient to produce a substantially higher level of luminescence in the luminescent layer than the level of brightness produced therein by the flooding beam, whereby selected areas of the luminescent layer may be brightened.
Claim 9
Dependent Claim
104 words
A cathode ray tube comprising a target screen including a scotophor layer and a luminescent layer, an electron beam gun for producing and directing a first electron beam at the luminescent layer side of the target screen, said first beam being of sufficient energy to darken selected areas of said scotophor layer, and at least one additional electron beam gun for simultaneously producing and directing a second electron beam at said luminescent layer for flooding said luminescent layer with a second electron beam to visibly define darkened areas of said scotophor layer, said second beam being of insufficient energy to darken said scotophor layer.
Claim 10
Dependent Claim
36 words
A cathode ray tube according to claim 10 wherein said screen includes a transparent conductive layer, and said tube includes means for heating said transparent conductive layer to render darkened areas of said scotophor layer transparent.
Claim 11
Dependent Claim
58 words
A cathode ray tube according to claim 10 including means to intermittently attenuate said first electron beam to an energy level which is insufficient to darken areas of the scotophor layer but sufficient to produce a higher level of brightness in selected areas of the luminescent layer than the level of brightness produced therein by the flooding beam.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |