Cathode ray storage tube having target with photochromic memory device
阅读：858发布：2024-02-03
专利汇可以提供Cathode ray storage tube having target with photochromic memory device专利检索，专利查询，专利分析的服务。并且A non-viewing storage cathode ray tube having write, read and erase functions utilizes a target comprising photochromic material. One side of the target is covered with a phosphor layer which emits ultraviolet light upon irradiation by a writing and/or a reading electron beam. The other side of the photochromic target is covered by a layer of radiation sensitive material. The material may comprise a phosphor which emits red light upon irradiation by a reading or erasing electron beam. In the alternative, the radiation sensitive material may comprise a photoconductive layer sensing the transmission of light through the photochromic glass.，下面是Cathode ray storage tube having target with photochromic memory device专利的具体信息内容。
1. A non-viewing information storage and retrieval system comprising: a target having a light emitting phosphor layer, a photochromic material darkened by light emission from said phosphor layer in response to irradiation by an electron beam and a light sensitive layer for detecting light transmitted through said photochromic material, said photochromic material being located between said phosphor layer and said light sensitive layer; an electron beam source generating a writing electron beam for irradiating said target, said writing electron beam storing information at said target by darkening said photochromic material in response to light emission from said phosphor layer upon irradiation by said writing electron beam; a source of reading light for applying reading light to said photochromic material; a deflection means for moving said writing electron beam across said target so as to store information at different locations on said target; and a reading means for generating an electrical signal in response to the intensity of said reading light transmitted through said photochromic material at different locations on said target detected by said light sensitive layer.
2. The system of claim 1 wherein said light sensitive layer emits light in response to light transmitted through said photochromic material and said reading means detects light emitted from said light sensitive layer.
3. The system of claim 2 wherein said phosphor layer emits ultraviolet light and said light sensitive layer comprises a phosphor layer emitting red light upon irradiation of ultraviolet light from said ultraviolet light emitting phosphor.
4. The system of claim 3 wherein said source of reading light includes means for operating said electron beam source to generate a reading electron beam of lower intensity than said writing electron beam for irradiating said ultraviolet light emitting phosphor to provide said reading light and wherein said deflection means moves said reading electron beam across said target so as to retrieve information at different locations on said target.
5. The system of claim 4 further comprising: an additional electron beam source for generating an erasing electron beam directed at said red light emitting phosphor layer, said erasing electron beam bleaching said photochromic material by red light irradiation from said red light emitting phosphor layer; and a second deflection means for moving said erasing electron beam across said target so as to bleach selected darkened areas of said photochromic material.
6. The system of claim 5 further comprising: an envelope enclosing said target and said electron beam source, said reading means comprising a photon detector located externally of said envelope.
7. The system of claim 1 further comprising: another electron beam source for generating a reading electron beam for irradiating said light sensitive layer; said reading light being transmitted through said phosphor layer to said photochromic material; and said light sensitive layer comprising a photoconductive material responsive to the intensity of reading light transmitted through said photochromic material, said reading means detecting differences in current flow generated by said reading electron beam as said reading electron beam is moved across said target.
8. The system of claim 7 wherein said target comprises signal electrOdes, one signal electrode overlying said phosphor layer, said other signal electrode located between said photoconductive layer and said photochromic material, said reading means including circuitry connected to said signal electrodes for determining variations in current flow as said reading electron beam is moved across said target.
9. The system of claim 8 wherein said source for generating said writing electron beam and said source for generating said reading electron beam are positioned in substantially the same plane as said target, and at one edge thereof, said writing electron beam and said reading electron beam having a 45* trajectory with respect to said target at the respective sources thereof.
10. The system of claim 8 further comprising a deflection means generating fields for moving said writing electron beam and said reading electron beam across said target, the same fields deflecting both said writing electron beam and said reading electron beam.
11. An information storage and retrieval system comprising: a target having a first phosphor layer emitting ultraviolet light in response to irradiation by an electron beam, a second phosphor layer emitting red light in response to irradiation by an electron beam, a photochromic material darkened by ultraviolet light emitted from said first phosphor layer and bleached by red light emitted from said second phosphor layer, said photochromic material lying between said first phosphor layer and said second phosphor layer, and a first electron beam source for generating a writing electron beam irradiating said first phosphor layer thereby darkening said photochromic material in response to ultraviolet light emitted from said first phosphor layer; a first deflection means for moving said writing electron beam across said target so as to store information by darkening said photochromic material in response to ultraviolet light emission at different locations on said target; a source of reading light for applying reading light photochromic material; a reading means for generating a signal in response to variations in said reading light transmitted through said photochromic material at different locations of said target; a second electron beam source for generating an erasing electron beam irradiating said second phosphor layer thereby bleaching said photochromic material in response to red light emitted from said red phosphor layer; and a second deflection means for moving said erasing electron beam across said target so as to erase information by bleaching said photochromic material in response to red light emission at different locations on said target.
12. The system of claim 11 wherein said source of reading light includes means for operating said first electron beam to generate a reading electron beam irradiating said first phosphor layer, said first phosphor layer emitting ultraviolet reading light in response thereto, said ultraviolet reading light being transmitted through said photochromic material to said second phosphor layer, said second phosphor layer emitting red reading light in response to said ultraviolet reading light, said reading means detecting said red reading light.
13. The system of claim 11 wherein said source of reading light includes means for operating said first electron beam source to generate a reading electron beam irradiating said first phosphor layer to produce ultraviolet photons transmitted through said photochromic material and said second phosphor layer, said ultraviolet photons being detected directly by said reading means.
14. An information storage and retrieval system comprising: a target having a light emitting phosphor layer, a photochromic material darkened by light emission from said phosphor layer in response to irradiation by an electron beam, and a light sensitive layer, said photochromic material being located between said phosphor layer and said light sensitive layer; a writing electron beam source for irraDiating said phosphor layer with a writing electron beam to store information in said target by darkening said photochromic material; a source of reading light for applying reading light to said photochromic material; a reading electron beam source for irradiating said light sensitive layer with a reading electron beam for retrieving information represented by the darkened photochromic material; a deflection means generating fields for moving said writing electron beam and said reading electron beam across said target so as to selectively store and retrieve information at different locations on said target, said writing electron beam and said reading electron beam being deflected by the same fields; and a reading means for generating a signal in response to reading light transmitted through said photochromic material as said reading electron beam is moved across said target.
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