US2600142A - Electron-discharge tube - Google Patents
Electron-discharge tube Download PDFInfo
- Publication number
- US2600142A US2600142A US188558A US18855850A US2600142A US 2600142 A US2600142 A US 2600142A US 188558 A US188558 A US 188558A US 18855850 A US18855850 A US 18855850A US 2600142 A US2600142 A US 2600142A
- Authority
- US
- United States
- Prior art keywords
- electron
- cathode
- rods
- accelerating electrode
- discharge tube
- 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
- 238000010276 construction Methods 0.000 description 4
- 238000010894 electron beam technology Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
- H01J3/02—Electron guns
- H01J3/029—Schematic arrangements for beam forming
Definitions
- This invention relates to electron-discharge tubes, wherein a ribbon-shaped electron beam is produced.
- the electron gun usually consists of a cage-shaped chamber which is formed by a number of plate-shaped electrodes and in which an elongated cathode is arranged preferably in the plane of one of the walls. Opposite the cathode an accelerating anode is provided, which is furnished with a slit extending parallel to the longitudinal direction of the cathode.
- the electron gun is required to satisfy stringent requirements.
- a ribbon-shaped beam carrying a maximum current at a minimum voltage is required to be produced.
- the surface of the anode system struck by the beam should be very small and not be influenced by small discrepancies in the construction of the gun or by small voltage variations of the electrodes havin a fixed potential.
- the ribbonshaped beam should have cleanly outlined side faces, and the construction of the gun should be such that no secondary electrons issue therefrom, by which an excessive deflection anode current, which is different for difierent specimens, would be caused.
- guns of known construction exhibit certain imperfections which are hardly tolerable for the aforesaid uses and the reasons for which are not obvious.
- an electron-discharge tube comprising an electron gun which produces a ribbon-shaped beam and consists of a cage formed by plate-shaped electrodes and containing an elongated cathode arranged in the plane of one of the walls of the cage, an accelerating electrode arranged opposite the cathode being furnished with a slit-shaped aperture, is characterized in that a plurality of rods is provided, within the cage between the accelcrating electrode and the cathode and arranged symmetrically with respect to the said slit such that the distance of each of the rods from the accelerating electrode is at the most of the distance from the accelerating electrode to the cathode, the distance of each of the rods from the remaining plate-shaped electrodes corresponding at least to the distance from each rod to the nearer edge of the slit provided in the accelerating electrode.
- an electron gun comprising a cathode I, a shielding electrode 2, control electrodes 3, 3 for adjusting the beam current, focussing electrodes 4, 4 and an accelerating electrode 5.
- Two rods 8, and 8' are provided at the cathode side of the accelerating electrode 5 so that the distance of these rods from the edges 9, 9 of a slit 6 provided in the electrode 5 is equal to or smaller than the distance of the rods 8, 8' from the other electrodes, more particularly the electrodes 4, 4'.
- the distance from the rods 8, 8' to the accelerating electrode 5 is required to be smaller than of the distance from the accelerating electrode 5 to the cathode I.
- the beam is adapted to be deflected by deflection plates 1, 1' to anodes in the usual manner.
- the voltage applied to the accelerating electrode 5 should be such that the field due to this voltage is effective in the spaces between the rods 8, 8' and between the electrodes 4, 4 e. g. 300 volts.
- the electrodes 2, 4, 4, 8, 8 may be connected to the cathode, thus obtaining a so-called one-voltage gun, of which only the accelerating electrode 5 is supplied with positive voltage.
- the deflection of the beam to anode ID or H) can be obtained by applying a control-voltage on the deflection plate varying from till 220 volts, the plate 1' being connected to a constant voltage of 150.
- the focussing action of the electrodes 3, 3' can be adjusted by means of the low negative voltages derived from the potentiometer l l WhatIclaim is:
- An electron-discharge tube comprising an electron-gun which produces a ribbon-shaped beam
- said electron gun comprising a cage having walls constituted by a set of plate-shaped electrodes and an elongated cathode mounted in the plane of one of the walls of the cage, an accelerating electrode mounted opposite the cathode, said accelerating electrode having a slit-shaped aperture, a plurality of rods mounted within the cage between the accelerating electrode and the cathode and arranged symmetrically with respect to the said slit, each of said rods being spaced from the accelerating electrode a distance which is at most 5- /3 o'f the' dis tance from the accelerating electrode to the cathode, the distance of each of the rods from the remaining plate-shaped electrodes corresponding at least to the distance iremeach rod to the nearer edge of the slit provided in the accelerating electrode.
Landscapes
- Electron Sources, Ion Sources (AREA)
- Discharge Lamp (AREA)
- Particle Accelerators (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL285277X | 1949-10-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2600142A true US2600142A (en) | 1952-06-10 |
Family
ID=19782483
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US188558A Expired - Lifetime US2600142A (en) | 1949-10-28 | 1950-10-05 | Electron-discharge tube |
Country Status (7)
Country | Link |
---|---|
US (1) | US2600142A (de) |
BE (1) | BE498965A (de) |
CH (1) | CH285277A (de) |
DE (1) | DE833234C (de) |
FR (1) | FR1026581A (de) |
GB (1) | GB680076A (de) |
NL (1) | NL78085C (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733379A (en) * | 1950-10-12 | 1956-01-31 | Device of the kind comprising an elec- | |
US2781468A (en) * | 1952-02-18 | 1957-02-12 | Zenith Radio Corp | Television receiver |
US2874283A (en) * | 1954-07-30 | 1959-02-17 | Cons Electrodynamics Corp | Electron beam deflection multivibrator circuits |
US2882399A (en) * | 1955-02-28 | 1959-04-14 | Bendix Aviat Corp | Electron switch |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2472779A (en) * | 1947-02-17 | 1949-06-07 | Farnsworth Res Corp | Cathode-ray tube amplifier |
US2511143A (en) * | 1948-02-12 | 1950-06-13 | Zenith Radio Corp | Electron discharge device |
US2539250A (en) * | 1948-12-22 | 1951-01-23 | Marvin Schuster | Deflection type vacuum tube |
-
0
- NL NL78085D patent/NL78085C/xx active
- BE BE498965D patent/BE498965A/xx unknown
-
1950
- 1950-10-05 US US188558A patent/US2600142A/en not_active Expired - Lifetime
- 1950-10-25 GB GB26000/50A patent/GB680076A/en not_active Expired
- 1950-10-25 DE DEN3042A patent/DE833234C/de not_active Expired
- 1950-10-26 FR FR1026581D patent/FR1026581A/fr not_active Expired
- 1950-10-26 CH CH285277D patent/CH285277A/de unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2472779A (en) * | 1947-02-17 | 1949-06-07 | Farnsworth Res Corp | Cathode-ray tube amplifier |
US2511143A (en) * | 1948-02-12 | 1950-06-13 | Zenith Radio Corp | Electron discharge device |
US2539250A (en) * | 1948-12-22 | 1951-01-23 | Marvin Schuster | Deflection type vacuum tube |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2733379A (en) * | 1950-10-12 | 1956-01-31 | Device of the kind comprising an elec- | |
US2781468A (en) * | 1952-02-18 | 1957-02-12 | Zenith Radio Corp | Television receiver |
US2874283A (en) * | 1954-07-30 | 1959-02-17 | Cons Electrodynamics Corp | Electron beam deflection multivibrator circuits |
US2882399A (en) * | 1955-02-28 | 1959-04-14 | Bendix Aviat Corp | Electron switch |
Also Published As
Publication number | Publication date |
---|---|
FR1026581A (fr) | 1953-04-29 |
GB680076A (en) | 1952-10-01 |
BE498965A (de) | |
CH285277A (de) | 1952-08-31 |
NL78085C (de) | |
DE833234C (de) | 1952-03-06 |
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