GB671472A - Improvements in or relating to electron discharge tubes used in television or the like - Google Patents
Improvements in or relating to electron discharge tubes used in television or the likeInfo
- Publication number
- GB671472A GB671472A GB8899/49A GB889949A GB671472A GB 671472 A GB671472 A GB 671472A GB 8899/49 A GB8899/49 A GB 8899/49A GB 889949 A GB889949 A GB 889949A GB 671472 A GB671472 A GB 671472A
- Authority
- GB
- United Kingdom
- Prior art keywords
- layer
- conductivity
- electrons
- cathode
- electron
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/41—Charge-storage screens using secondary emission, e.g. for supericonoscope
- H01J29/413—Charge-storage screens using secondary emission, e.g. for supericonoscope for writing and reading of charge pattern on opposite sides of the target, e.g. for superorthicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/36—Photoelectric screens; Charge-storage screens
- H01J29/39—Charge-storage screens
- H01J29/44—Charge-storage screens exhibiting internal electric effects caused by particle radiation, e.g. bombardment-induced conductivity
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/10—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes
- H01J31/12—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J31/00—Cathode ray tubes; Electron beam tubes
- H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
- H01J31/26—Image pick-up tubes having an input of visible light and electric output
- H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
- H01J31/30—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at anode potential, e.g. iconoscope
- H01J31/32—Tubes with image amplification section, e.g. image-iconoscope, supericonoscope
Landscapes
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
- Luminescent Compositions (AREA)
Abstract
671,472. Cathode-ray tubes. COMPAGNIE POUR LA FABRICATION DES COMPTEURS ET MATERIEL D' USINES A GAZ. April 1, 1949 [April 13, 1948], No. 8899/49. Class 39 (i). An electron discharge tube comprises a storage electrode which includes a continuous conducting layer and a layer of material, the conductivity of elementary areas of which is proportional to the intensity of high velocity electrons of an electron image incident on one side of the storage electrode, the said conductivity being effective to control the emission of secondary electrons from the storage electrode when it is scanned on the other side by a cathode-ray beam. A thin electron permeable film 2 of aluminium, beryllium or magnesium supports three layers, one 7 of material fluorescing in the ultra-violet upon impact of electrons, e.g. calcium oxide activated by lead, calcium tungstate, zinc sulphide or an alkali halide activated by thallium; the second a thin layer 8 of cadmium iodide CdI 2 evaporated in vacuo, the conductivity of which is proportional to the intensity of the incident ultraviolet radiation; and a third layer 9 which is optional, comprising thin metallic particles insulated from each other and sensitized to give especially high secondary emission. Light from the object falls on the photo-cathode 4, the electrons are accelerated on to layer 7, producing ultra-violet radiation which gives a conductivity pattern in the cadmium iodide layer 8. The scanning beam 5 liberates secondary electrons which are collected by anode 6 and yield signals. Plate 2 may also act as the signal plate. The cadmium iodide may be replaced by an alkaline salt activated by a heavy metal. In a modification (Fig. 2, not shown), the layer 7 is emitted and a layer of cadmium selenide or sulphide is deposited on film 2, e.g. by sedimentation or electrophoresis, and covered by a secondary emissive mosaic 9 as before. The conductivity and/or dielectric constant of the deposited layer varies with the impact of the electron from the plate cathode, and sets up a conductivity pattern which determines the signals produced by the scanning. The layer of selenide must be thin, and an extremely thin layer of insulating material may be interpolated between film 2 and the conductive layer to stop slow electrons. The mosaic layer may be omitted, the cadmium selenide being secondary electron emitting. Specification 648,509 is referred to. The Specification as open to inspection under Sect. 91, also comprises the subject-matter of Fig. 3, (Cancelled), in which a modulated scanning beam falls on a target comprising a metal film 2<SP>1</SP>, a layer of cadmium selenide 10<SP>1</SP> covered by a photo-cathode layer 3<SP>1</SP> of silvered particles sensitized by oxygen and cµsium. The latter is flooded by light from a source 14. The scanning beam sets up a conductivity pattern which produces a control potential governing the emission from the photo-electric mosaic. The photo-electrons are accelerated by anode 13 on to a fluorescent layer 12. The induced conductivity is spontaneously alternated by means of a scanning period of the order of <SP>1</SP>/ 25 second. This subject-matter does not appear in the Specification as accepted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR904777X | 1948-04-13 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB671472A true GB671472A (en) | 1952-05-07 |
Family
ID=9405160
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8898/49A Expired GB686448A (en) | 1948-04-13 | 1949-04-01 | Improvements in or relating to electron discharge tubes used in television |
GB8899/49A Expired GB671472A (en) | 1948-04-13 | 1949-04-01 | Improvements in or relating to electron discharge tubes used in television or the like |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB8898/49A Expired GB686448A (en) | 1948-04-13 | 1949-04-01 | Improvements in or relating to electron discharge tubes used in television |
Country Status (3)
Country | Link |
---|---|
DE (2) | DE919235C (en) |
FR (2) | FR1007896A (en) |
GB (2) | GB686448A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE490037A (en) * | 1948-07-07 | |||
DE974081C (en) * | 1951-03-20 | 1960-09-08 | Hans-Werner Dr Rer Nat Paehr | Arrangement for picture taking tubes |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB597532A (en) * | 1945-07-12 | 1948-01-28 | Hans Gerhard Lubszynski | Improvements in or relating to electron discharge devices, such as television transmitting tubes |
US2141059A (en) * | 1923-12-29 | 1938-12-20 | Westinghouse Electric & Mfg Co | Television system |
DE706872C (en) * | 1938-03-12 | 1941-06-07 | Fernseh Gmbh | Arrangement for point-by-point scanning of a charge image stored on a picture electrode with an electronic semiconductor layer |
-
1948
- 1948-04-13 FR FR1007896D patent/FR1007896A/en not_active Expired
- 1948-04-13 FR FR1007895D patent/FR1007895A/en not_active Expired
-
1949
- 1949-04-01 GB GB8898/49A patent/GB686448A/en not_active Expired
- 1949-04-01 GB GB8899/49A patent/GB671472A/en not_active Expired
-
1950
- 1950-09-29 DE DEC2737A patent/DE919235C/en not_active Expired
- 1950-09-29 DE DEC2735A patent/DE904777C/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
DE919235C (en) | 1954-10-18 |
FR1007896A (en) | 1952-05-12 |
GB686448A (en) | 1953-01-28 |
DE904777C (en) | 1954-02-22 |
FR1007895A (en) | 1952-05-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2258294A (en) | Photoelectric device | |
GB711202A (en) | Electron camera tubes | |
US2535817A (en) | Electrooptical dark trace storage tube | |
US2177736A (en) | Television transmitting apparatus | |
US2460093A (en) | Cathode beam transmitter tube | |
US2555091A (en) | Cathode-ray tube | |
GB693956A (en) | Improvements in or relating to storage electrodes for use in signal converting electron discharge tubes | |
US2776387A (en) | Pick-up tube with induced conductivity target | |
US3555345A (en) | Radiation pickup device incorporating electron multiplication | |
US2927234A (en) | Photoconductive image intensifier | |
GB977428A (en) | Image tubes | |
US2212923A (en) | Picture transmitter | |
GB743431A (en) | Improvements in or relating to picture and/or picture signal producing electron discharge tubes | |
GB671472A (en) | Improvements in or relating to electron discharge tubes used in television or the like | |
US2373396A (en) | Electron discharge device | |
US2213173A (en) | Television transmitting tube | |
US2916661A (en) | Storage cathode ray tube | |
US2617954A (en) | Pickup tube | |
US2900569A (en) | Photoconductive type pickup tubes | |
US3505558A (en) | Composite target structure for television,x-ray and ultrasound camera tube | |
US2973445A (en) | Device for detection, conversion, and amplification of x-ray images | |
US3315108A (en) | High lag, high sensitivity target having solid antimony oxysulphide and porous antimony trisulphide layers | |
US2227097A (en) | Electron tube apparatus | |
US2757233A (en) | Electron discharge tube arrangements | |
US2227092A (en) | Cathode ray tube |