US3710173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct viewing storage tube having mesh halftone target and nonmesh bistable target
Assignee: Tektronix Inc
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Filing: 1970-06-17
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Granted: 1973-01-09
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Expires: 1990-06-17
Abstract
Abstract A direct viewing charge image storage tube is described in which a low density halftone storage target is employed along with a higher density bistable storage target. Charge images are written on the halftone target at a fast writing speed, up to about 300 million centimeters per second, and then such charge image is transferred to the bistable target where it is stored for a long time, up to one hour or more. The bistable storage target may be of the nonmesh type that employs a storage dielectric of phosphor material which emits a light image corresponding to the charge image stored thereon. The storage dielectric of a halftone target is more porous and lower density than the phosphor storage dielectric and may be a porous metal oxide, such as magnesium oxide, having a density of 2 to 5 percent of its normal bulk density which provides a target of low capacitance and extremely fast writing speed.
Inventors
- 👤 T Hutchins
- 👤 W Templeton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:36
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/18; H01J29/00; H01J29/02; H01J29/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
51 words
A storage tube apparatus in accordance with claim 1 in which the second storage target is a nonmesh target which has a second storage dielectric of phosphor material and has the second target electrode and said phosphor storage dielectric provided as layers on a light transparent support member of insulating material.
Claim 2
Dependent Claim
45 words
A storage tube apparatus in accordance with claim 1 in which the first storage dielectric is capable of halftone image storage and comprises a porous dielectric material of a high resistivity and a low density of less than 10 percent of its normal bulk density.
Claim 3
Dependent Claim
51 words
A storage tube apparatus in accordance with claim 3 in which the second storage dielectric is capable of bistable image storage by secondary electron emission when bombarded by said low-velocity electrons, and the transfer and storage means includes a collector means for collecting the secondary electrons emitted by said second dielectric.
Claim 4
Dependent Claim
50 words
A storage tube apparatus in accordance with claim 1 which also includes bias means for selectively applying different D.C. bias voltages to the first and second target electrodes to provide the storage tube with bistable storage, halftone storage, or nonstorage display operation as well as the aforementioned charge transfer operation.
Claim 5
Dependent Claim
78 words
A storage tube apparatus in accordance with claim 2 in which the second target electrode is a light transparent conductive film provided beneath the phosphor storage dielectric and the phosphor storage dielectric is an undivided phosphor layer which is sufficiently porous to enable secondary electrons emitted therefrom by the bombardment of low-velocity electrons to be transmitted through the phosphor layer and collected by said conductive film to enable bistable storage of charge images formed on said phosphor layer.
Claim 6
Dependent Claim
20 words
A storage tube apparatus in accordance with claim 3 in which the first storage dielectric is a porous metal oxide.
Claim 7
Dependent Claim
17 words
A storage tube apparatus in accordance with claim 7 in which the metal oxide is magnesium oxide.
Claim 8
Dependent Claim
28 words
A storage tube apparatus in accordance with claim 8 in which the magnesium oxide has a density of about 2 to 5 percent of its normal bulk density.
Claim 9
Dependent Claim
35 words
A storage tube apparatus in accordance with claim 1 which also Includes a mesh electrode separate from the storage targets and supported on the side of the first storage target remote from said second target.
Claim 10
Dependent Claim
24 words
A storage tube apparatus in accordance with claim 2 in which the phosphor dielectric is provided as a plurality of separate, spaced phosphor areas.
Claim 11
Dependent Claim
34 words
A storage tube apparatus in accordance with claim 11 in which the second target electrode is in the form of an apertured layer with said phosphor areas provided in the apertures of said layer.
Claim 12
Dependent Claim
66 words
A storage tube apparatus in accordance with claim 2 in which the transparent support member is a glass plate having a plurality of separate, spaced projections on one side thereof with land areas extending between said projections, the second target electrode is a transparent conductive film coated on said projections and said land areas, and the phosphor storage dielectric layer is coated over said conductive film.
Claim 13
Dependent Claim
29 words
A storage tube apparatus in accordance with claim 13 in which those portions of the conductive film covering the tips of said projections extend completely through the phosphor layer.
References Cited (Backward Citations)
US3197661A
Cited
US3165664A
Cited
US3293473A
Cited
US3213316A
Cited
US3293474A
Cited
US3531675A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-09 | 1976-07-10 | 1977-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-09 | 1980-07-10 | 1981-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-09 | 1984-07-10 | 1985-01-09 | $7700.00 | Window Closed / Lapsed |