US4139800A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bistable storage target having interdigitated target electrode for selective erasure
Assignee: Tektronix Inc
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Filing: 1977-06-27
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Granted: 1979-02-13
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Expires: 1997-06-27
Abstract
Abstract A bistable storage target for use with a cathode ray storage tube is provided with electrode members forming an interdigitated electrode means. Electrode members connected to one bus bar are provided with collector electrode means which extend through a storage dielectric covering the electrode means for collecting secondary electrons emitted from written areas of the storage dielectric. Electrode members connected to another bus bar are isolated from the first bus bar electrode members and they are raised to a predetermined positive voltage subsequent to the flood gun means being turned off, the writing gun is turned on and the electron beam is directed to a selected area of the target thereby erasing the stored written information thereon.
Inventors
- 👤 Bruce H. Ostermeier
- 👤 Duane A. Haven
- 👤 Gordon M. Sletmoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:37
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/122; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/39; H01J29/41
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
316 words
A cathode ray storage tube apparatus for storing written information, comprising: an evacuated envelope; a storage target secured onto said evacuated envelope including an insulative support member having first electrode means including spaced first electrode members extending along an inside surface of said support member and second electrode means including spaced second electrode members extending along said inside surface in interdigitated relationship with respect to said spaced first electrode members of said first electrode means, a layer of storage dielectric material provided onto said support member over said inside surface and said interdigitated electrode members, collector electrode means provided by said first electrode members of said first electrode means; writing means mounted within said envelope for bombarding said storage level with a writing beam of high velocity electrons including means for deflecting said writing beam across said storage target to produce an electron image in accordance with input information on said storage dielectric layer corresponding to the input information; holding means mounted within said envelope for bombarding said storage target substantially uniformly with low velocity electrons which cause secondary electrons to be emitted from said electron image and said secondary electrons being collected by said collector electrode means thereby causing said electron image to be stored bistably for an indefinite controllable time on said storage dielectric layer; and selective erasing means connected to said holding means, said second electrode means, said writing means and said deflecting means for turning off said holding means during a period that selective erasing of stored information takes place, for raising said second electrode means to a predetermined potential, for activating said writing means to bombard said storage target with an erasing beam of electrons and for controlling said deflecting means to deflect said erasing beam of electrons to a selected area of said storage target thereby erasing the portion of said electron image that is stored in said selected area.
Claim 2
Dependent Claim
316 words
A cathode ray storage tube apparatus for storing written information, comprising: an evacuated envelope; a storage target secured onto said evacuated envelope including an insulative support member having first electrode means including spaced first electrode members extending along an inside surface of said support member and second electrode means including spaced second electrode members extending along said inside surface in interdigitated relationship with respect to said spaced first electrode members of said first electrode means, a layer of storage dielectric material provided onto said support member over said inside surface and said interdigitated electrode members, collector electrode means provided by said first electrode members of said first electrode means; writing means mounted within said envelope for bombarding said storage level with a writing beam of high velocity electrons including means for deflecting said writing beam across said storage target to produce an electron image in accordance with input information on said storage dielectric layer corresponding to the input information; holding means mounted within said envelope for bombarding said storage target substantially uniformly with low velocity electrons which cause secondary electrons to be emitted from said electron image and said secondary electrons being collected by said collector electrode means thereby causing said electron image to be stored bistably for an indefinite controllable time on said storage dielectric layer; and selective erasing means connected to said holding means, said second electrode means, said writing means and said deflecting means for turning off said holding means during a period that selective erasing of stored information takes place, for raising said second electrode means to a predetermined potential, for activating said writing means to bombard said storage target with an erasing beam of electrons and for controlling said deflecting means to deflect said erasing beam of electrons to a selected area of said storage target thereby erasing the portion of said electron image that is stored in said selected area.
Claim 3
Dependent Claim
40 words
A cathode ray storage tube apparatus according to claim 1 wherein said collector electrode means define collector electrode members extending through said storage dielectric layer and they have portions which extend above the top surface of said storage dielectric layer.
Claim 4
Dependent Claim
17 words
A cathode ray storage tube apparatus according to claim 1 wherein said insulative support member is transparent.
Claim 5
Dependent Claim
17 words
A cathode ray storage tube apparatus according to claim 1 wherein said electrode members have openings therethrough.
Claim 6
Dependent Claim
16 words
A cathode ray storage tube apparatus according to claim 1 wherein said electrode members are transparent.
Claim 7
Dependent Claim
22 words
A cathode ray storage tube apparatus according to claim 1 wherein said second electrode means is raised above said collector electrode means.
Claim 8
Dependent Claim
35 words
A cathode ray storage tube apparatus according to claim 1 wherein erasing means is connected to said first electrode means for applying erasing pulse means thereto to completely erase stored information from said storage target.
Claim 9
Dependent Claim
173 words
A storage target for use with a storage cathode ray tube having writing means for generating a high velocity electron beam including deflecting means for deflecting the high velocity electron beam across and along said storage target and holding means for generating low velocity electrons and directing them onto the storage target, said storage target comprising: an insulative support member having an inner smooth and substantially nonanomolous surface; first electrode means provided on said inner surface of said insulative support member including spaced first electrode members; second electrode means provided on said inner surface of said insulative support member including spaced second electrode members, said first electrode members and said second electrode members being disposed adjacent each other in spaced relationship thereby defining an interdigitated electrode structure; collector electrode means provided by said first electrode members at spaced intervals therealong; and a layer of bistable storage material provided on said inner surface of said support member and over said interdigitated electrode structure, said storage layer having openings therethrough for said collector electrode means.
Claim 10
Dependent Claim
173 words
A storage target for use with a storage cathode ray tube having writing means for generating a high velocity electron beam including deflecting means for deflecting the high velocity electron beam across and along said storage target and holding means for generating low velocity electrons and directing them onto the storage target, said storage target comprising: an insulative support member having an inner smooth and substantially nonanomolous surface; first electrode means provided on said inner surface of said insulative support member including spaced first electrode members; second electrode means provided on said inner surface of said insulative support member including spaced second electrode members, said first electrode members and said second electrode members being disposed adjacent each other in spaced relationship thereby defining an interdigitated electrode structure; collector electrode means provided by said first electrode members at spaced intervals therealong; and a layer of bistable storage material provided on said inner surface of said support member and over said interdigitated electrode structure, said storage layer having openings therethrough for said collector electrode means.
Claim 11
Dependent Claim
14 words
A storage target according to claim 8 wherein said insulative support member is transparent.
Claim 12
Dependent Claim
17 words
A storage target according to claim 8 wherein said layer of bistable material is a phosphor material.
Claim 13
Dependent Claim
32 words
A storage target according to claim 8 wherein said collector electrode means comprise collector electrode members the outer ends of which extend outwardly beyond the top surface of said bistable storage layer.
Claim 14
Dependent Claim
14 words
A storage target according to claim 8 wherein said electrode members have openings therethrough.
Claim 15
Dependent Claim
21 words
A storage target according to claim 8 wherein said electrode members are transparent, except where said collector electrode means are located.
Claim 16
Dependent Claim
22 words
A storage target according to claim 8 wherein said second electrode members are provided with collector electrode means at spaced intervals therealong.
Claim 17
Dependent Claim
95 words
A storage target according to claim 14 wherein said layer of bistable storage material comprises first and second sections of phosphor material, said first section of phosphor material display one color and they overlie said first electrode members and said inner surface of said insulative support member with said collector electrode means extending therethrough exposing outer ends thereof, said second sections of phosphor material display another color and they overlie said second electrode members and said inner surface of said insulative support member with said collector electrode means extending therethrough and exposing outer ends thereof.
References Cited (Backward Citations)
US3651362A
Cited
US3956662A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-02-12 | 1982-08-14 | 1983-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-12 | 1986-08-14 | 1987-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-12 | 1990-08-14 | 1991-02-13 | $7700.00 | Window Closed / Lapsed |