US3197661A - Signal storage tubes - Google Patents
Signal storage tubes Download PDFInfo
- Publication number
- US3197661A US3197661A US88987A US8898761A US3197661A US 3197661 A US3197661 A US 3197661A US 88987 A US88987 A US 88987A US 8898761 A US8898761 A US 8898761A US 3197661 A US3197661 A US 3197661A
- Authority
- US
- United States
- Prior art keywords
- storage electrode
- electrode
- storage
- electron source
- 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 - Lifetime
Links
Images
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
- H01J29/395—Charge-storage screens charge-storage grids exhibiting triode effect
-
- 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
- H01J31/18—Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes with luminescent screen with image written by a ray or beam on a grid-like charge-accumulating screen, and with a ray or beam passing through and influenced by this screen before striking the luminescent screen, e.g. direct-view storage tube
Definitions
- This invention relies on the use of material exhibiting the so-called Malter Effect or Thin Film Field Emission.
- a material exhibits the property that under the influence of a bombarding electron beam and an external electric field its surface becomes highly positively charged due to secondary electron emission, the intense potential gradient thereby established through the material causing further electrons to be expelled therefrom.
- Malter Effect reference may be made to a paper entitled, Thin Film Field Emission, by Louis Malter in the Psyhical Review for July 1, 1936, volume 50, at pages 48-58.
- a signal storage tube has an electron source, a storage electrode positioned in the path q of electrons from said source and comprising a metallic mesh or grid having deposited on the side thereof towards the electron source a thin insulating layer of material exhibiting the so-called Malter Effect, a collector electrode closely adjacent but spaced from said storage elect-rode on the side thereof nearer the electron source, and a further electrode closely adjacent but spaced from said storage electrode on the side thereof remote from the electron source.
- the signal storage tube is of the direct viewing kind having a fluorescent screen on the same side of the storage electrode as said further electrode.
- the further electrode constitutes a metallic backing film for the fluorescent screen.
- the electron source may be a photo-electric cathode or it may be an electron gun having means adapted to switch the beam from said gun on and off in accordance with signals to be stored.
- the storage electrode is coated on the side nearer said further electrode with a substance which tends to suppress electron emission.
- a substance which tends to suppress electron emission is gold.
- the thin insulating layer of the storage electrode is of magnesium oxide, and preferably also the material of said metallic mesh or grid is nickel.
- the envelope 1 of the tube therein shown has a fluorescent screen 2, shown as a thickened line, on its flat end face.
- the fluorescent screen is backed by a thin aluminium film (not separately shown) in well-known manner.
- Parallel to the screen. 2 and spaced a short distance from it is mounted the storage electrode 3.
- the storage electrode 3 comprises a mesh or grid of nickel having deposited on the side farther from the screen 2 a layer of magnesium oxide of such purity that it acts as a good insulator and secondary electron emitter and exhibits the so-called Malter Effect.
- the other side of the nickel mesh or grid i.e., the side nearer the ice screen 2 is coated with gold, the arrangement of the storage electrode being such that the interstices of the grid or mesh are not filled by the coatings on each side but are left open so that the storage electrode as a whole is foraminous.
- collector electrode 4 On the side of the storage elect-rode remote from the fluorescent screen is a collector electrode 4 in the form of a coarse metal mesh which is parallel to, and spaced a small distance from, the storage electrode.
- An electron gun 5 which is as well known per se and requires no further description here, is arranged to produce an electron beam which is focussed on and deflected across the storage electrode 3 by means (not shown) but which are also well known and require no further description.
- the fluorescent screen is at a positive potential of several thousand volts
- the collector electrode 4 at a positive potential of several hundred volts
- the electron gun cathode at a negative potential of several thousand volts.
- the action of the storage tube is as follows.
- the electron beam from the gun 5 is deflected across the target electrode 3 in any suitable manner (in accordance with the use to which the storage tube is being put) and the beam is switched on and off in accordance with the signals to be stored and displayed.
- the parts of the storage electrode 3 which are bombarded by the electron beam give up secondary electrons as a result of this bombardment, the arrangement being such that the ratio of secondary to primary electrons exceeds unity, and the secondary electrons are collected by the positively biased collector grid 4.
- the surface of bombarded areas of the insulating layer of storage electrode 3 become positively charged and field emission due to the so-called Malter Effect commences, electrons being drawn from the insulating layer of the storage electrode under the influence of the positive charge on the surface and passing to the collector electrode under the influence of the potential gradient between it and the storage electrode. Due to this field emission the surface of the insulating layer charges more positively until an equilibrium state is reached in which the potential of the insulating layer is lower than that of the collector electrode by such a value that the emission from the storage electrode is balanced by the current in the external circuit connected to the metallic grid or mesh of the storage electrode. It should be noted that all the bombarded parts of the storage electrode will reach substantially the same final potential while all the unbombarded parts will remain uncharged.
- the charge pattern on the storage electrode will remain until such time as the tube electrode potentials are changed in such manner as to erase it. Erasure may be carried out by reducing the potential of the collector grid or by increasing the potential of the storage electrode.
- the purpose of the gold deposit on the side of the storage electrode nearer the fluorescent screen is to prevent field emission taking place from the insulating layer due solely to the voltage gradient between the storage electrode and the fluorescent screen.
- the spacing between the storage electrode and the L3 fluorescent screen, on the one hand, and between the storage electrode and the collect-or grid, on the other, was 0.2" in each case, the operating potentials being as shown in the drawing.
- the construction of the storage electrode is not limited to the use of the material specified above.
- the insulating layer may be made of caesium oxide on alumina, for example, while the metal grid or mesh might of stainless steel.
- any other material which is of such a nature as to suppress field emission might be used.
- the electron gun may be replaced by a photo-cathode which will respond to external light stimulus.
- the fluorescent screen is replaced by a simple signal plate thus providing an arrangement in which a large continuous current may be provided from the signal plate in response to a transient signal applied to the electron gun.
- a signal storage tube including an electron source, a storage electrode positioned in the path of electrons from said source and comprising a metallic mesh having deposited on the side thereof towards the electron source a thin insulating layer of material exhibiting the Malter Effect, a collector electrode closely adjacent but spaced from said storage elect-rode on the side thereof nearer the electron source, and a further electrode closely adjacent but spaced from said storage electrode on the side thereof remote from the electron source.
- a tube as claimed in claim 1 wherein the electron source is an electron gun having means adapted to switch the beam from said gun on and off in accordance with signals to be stored.
Landscapes
- Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
- Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB6132/60A GB890626A (en) | 1960-02-22 | 1960-02-22 | Improvements in or relating to signal storage tubes |
Publications (1)
Publication Number | Publication Date |
---|---|
US3197661A true US3197661A (en) | 1965-07-27 |
Family
ID=9809013
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US88987A Expired - Lifetime US3197661A (en) | 1960-02-22 | 1961-02-13 | Signal storage tubes |
Country Status (6)
Country | Link |
---|---|
US (1) | US3197661A (fr) |
CH (1) | CH378371A (fr) |
DE (1) | DE1198939B (fr) |
FR (1) | FR1280482A (fr) |
GB (1) | GB890626A (fr) |
NL (1) | NL261454A (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3348089A (en) * | 1963-07-29 | 1967-10-17 | Ibm | Cyclotron accelerator having the electrostatic field appearing across a nonlinear gap |
US3710179A (en) * | 1971-09-14 | 1973-01-09 | Tektronix Inc | Storage tube having transmission target with low differential cutoff |
US3710173A (en) * | 1970-06-17 | 1973-01-09 | Tektronix Inc | Direct viewing storage tube having mesh halftone target and nonmesh bistable target |
US3811067A (en) * | 1970-10-08 | 1974-05-14 | Automation Ind Inc | Ultrasonic imaging tube |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2254486B (en) * | 1991-03-06 | 1995-01-18 | Sony Corp | Flat image-display apparatus |
GB2259184B (en) * | 1991-03-06 | 1995-01-18 | Sony Corp | Flat image-display apparatus |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2558647A (en) * | 1947-12-12 | 1951-06-26 | Cinema Television Ltd | Storage electrode type cathode-ray tube |
US2887597A (en) * | 1955-10-27 | 1959-05-19 | Hughes Aircraft Co | Storage screen for direct-viewing storage tube |
US2896106A (en) * | 1956-12-11 | 1959-07-21 | Du Mont Allen B Lab Inc | Storage tube |
US2908836A (en) * | 1953-03-30 | 1959-10-13 | Itt | Charge storage device |
US2922907A (en) * | 1958-05-23 | 1960-01-26 | Gen Electric | Target electrode assembly |
US3002124A (en) * | 1956-04-09 | 1961-09-26 | Westinghouse Electric Corp | Display storage tube |
US3102212A (en) * | 1959-04-24 | 1963-08-27 | Motorola Inc | Cathode ray tube with low velocity deflection and post deflection beam acceleration |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2795727A (en) * | 1952-01-12 | 1957-06-11 | Hughes Aircraft Co | Direct-viewing electronic storage tubes |
-
0
- NL NL261454D patent/NL261454A/xx unknown
-
1960
- 1960-02-22 GB GB6132/60A patent/GB890626A/en not_active Expired
-
1961
- 1961-02-13 US US88987A patent/US3197661A/en not_active Expired - Lifetime
- 1961-02-20 CH CH201561A patent/CH378371A/fr unknown
- 1961-02-21 FR FR853380A patent/FR1280482A/fr not_active Expired
- 1961-02-21 DE DEE20637A patent/DE1198939B/de active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2558647A (en) * | 1947-12-12 | 1951-06-26 | Cinema Television Ltd | Storage electrode type cathode-ray tube |
US2908836A (en) * | 1953-03-30 | 1959-10-13 | Itt | Charge storage device |
US2887597A (en) * | 1955-10-27 | 1959-05-19 | Hughes Aircraft Co | Storage screen for direct-viewing storage tube |
US3002124A (en) * | 1956-04-09 | 1961-09-26 | Westinghouse Electric Corp | Display storage tube |
US2896106A (en) * | 1956-12-11 | 1959-07-21 | Du Mont Allen B Lab Inc | Storage tube |
US2922907A (en) * | 1958-05-23 | 1960-01-26 | Gen Electric | Target electrode assembly |
US3102212A (en) * | 1959-04-24 | 1963-08-27 | Motorola Inc | Cathode ray tube with low velocity deflection and post deflection beam acceleration |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3348089A (en) * | 1963-07-29 | 1967-10-17 | Ibm | Cyclotron accelerator having the electrostatic field appearing across a nonlinear gap |
US3710173A (en) * | 1970-06-17 | 1973-01-09 | Tektronix Inc | Direct viewing storage tube having mesh halftone target and nonmesh bistable target |
US3811067A (en) * | 1970-10-08 | 1974-05-14 | Automation Ind Inc | Ultrasonic imaging tube |
US3710179A (en) * | 1971-09-14 | 1973-01-09 | Tektronix Inc | Storage tube having transmission target with low differential cutoff |
Also Published As
Publication number | Publication date |
---|---|
DE1198939B (de) | 1965-08-19 |
GB890626A (en) | 1962-03-07 |
NL261454A (fr) | |
FR1280482A (fr) | 1961-12-29 |
CH378371A (fr) | 1964-06-15 |
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