US2513742A

US2513742A - Oscillographic cathode-ray tube with cylindrical fluorescent screen

Info

Publication number: US2513742A
Application number: US42706A
Authority: US
Inventors: Pinciroli Andrea
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-08-08
Filing date: 1948-08-05
Publication date: 1950-07-04
Anticipated expiration: 1967-07-04

Description

July 4, 1950 A. PlNClROLl OSCILLOGRAPHIC CATHODE-RAY TUBE WITH CYLINDRICAL FLUORESCENT SCREEN Filed Aug. 5, 1948 INVENTUR AIL 94 20;

Paiented Juiy 4, 195% OSCILLOGRAPHIC CATHODE-RAY {EUBE WITH CYLINDRICAL FLUORESCENT SCREEN Andrea Pinciroli, Turim' lta'ly Application Aug st 5, 1943, Serial No. 42,706

In Italy August 8, 1947 15 Claims. (Cl. 315-24) 1 "The present invention relates to an oscillographic cathode ray tube with fluorescent screen.

According to this'invention, the fluorescent screen has the shape of a cylindrical surface.

This surface may be extended as to cover completely the cylinder or may be extended along only a segment of it. The time base is originated by a rotating field acting upon an electron beam created as usual by an electron gun. The electron 'beam is" further bent to a direction approximately perpendicular to'the surface of the screen by an adequate electric field.

The time base is produced without saw toothed voltagesj it requires sinusoidal electric quantities, voltages or currents having a lower frequency than that'cf the voltage to be examined. The apparatus, object ofthe invention, also allows the simultaneous recording 'otmore than one o's'cillographic curve, of quantities having the same frequency or having frequencies multiple from one another. The obtained time base is particularly extended. The apparatus allows also for the simultaneous examination of a large number of electric quantities voltages or currents with their oscillographic flgure projected along separate segments of the cylindrical screen.

It is also possible to arrange in the samevacuum tube two separate electron beam systems in order to obtain two diflerent time bases. Finally there is no interaction between time base system and electron beam deflecting system.

The new invention will be better understood,

with the aid of the accompanying figures.

Figure 1 shows the tube completely in partial section; Figure 2 shows a modification of the deflecting SySllElZl; Figure 3 shows a tube with two simultaneous time bases; Figure 4 shows a tube having its fluorescent screen extended only along a small segment of the cylinder.

Considering Figure 1, the electron gun' is indicated by l. The rotating field is created by the electrodes 2 fed two by two by two voltages lagging 90 electric degrees -from one another in the usual way. This rotating field is then an electric field. A magnetic field can also be adopted or even the superposition of a magnetic field upon an electric field. The electron beam l is bent by means of two corolla shaped electrodes and finally it is deflected by means of two deflecting ring shaped electrodes 5. The rotating and deflected electron beam. hits the fluorescent screen 6 extending along the cylindrical part of the tube. On the same figure two ring shaped electrodes 4 located near the corolla shaped electrodes 3 are represented forming an 'electriccylindrical lens; this feature is non-essential.

The deflecting electrodes 5 may be subdivided, according to this invention, in many sections, each section being isolated from one another and corresponding to a separate electric quantity to be examined, as Fig. '2 shows.

According to the invention, one nlay have two separate electron beam systems operating simultaneously in the same tube aSFigu're 3 shows.

The numerals I and H indicate the electron guns.

The numerals '2 and I2 'indi'ca'tethe "system creating the rotating Held; in this case the rotating field is a'magnetic onecreated by magnetic coils, as indicated in the figure, in the usual way. The numerals 3 and l3indic'ate the corolla shaped bending electrodes. The numerals?) and T5 indicate 'the deflecting electrodes and finally cal screen. 7 d i So far a cylindrical screen covering 360 angular degrees has been indicated but one may limit the extension of thefluorescent screen along "a small angular segment" and the"tu'be has-'the external aspect indicated by Figure 4. Iclaim: I V 1. An oscillographic cathode ray tube having a cylindrical fluorescent screen, the control of the numeral 6 indicates the fluorescent cylindrith-e electron beam being operated by an electrostatic deflecting system of two concentrical'electrodes and having its time base' extended "along the fluorescent cylindrical screen by means of a rotating electric field created by a system of electrodes connected to a source of pclyphase voltages and being symmetrically placed with respect to the axis of the tube along which an electron gun is projecting an electron beam; the said electron beam being bent normally to the axis of the tube by means of corolla shaped electrodes symmetrically located with respect to the axis of the tube; the said electron beam. being deflected by two deflecting ring shaped electrodes, concentric and essentially parallel to one another symmetrically located with respect to the axis of the tube; the vacuum tube being itself 'cylindrically shaped and bearing the fluorescent screen along its cylindrical wall.

2. An oscillographic cathode ray tube having a cylindrical fluorescent screen, the control of the electron beam being operated by an electrostatic deflecting system of two concentrical electrodes and having its time base extended along the fluorescent cylindrical screen by means of a rotating magnetic field created by a system of coils traversed by polyphase currents symmetrically placed with respect to the axis of the tube along which an electron gun is projecting an electron beam; the said electron beam being bent normally to the axis of the tube by means of corolla shaped electrodes symmetrically located with respect to the axis of the tube; the said electron beam being deflected by two deflecting 4 7. An oscillograph cathode ray tube according to claim 1 the deflecting electrodes being subdivided in many circular sectors electrically insulated and energized by different sources.

8. An oscillograph cathode ray tube according to claim 2 the deflecting electrodes being subdivided in many circular sectors electrically insu lated and energized by different'sources.

9. An oscillograph cathode ray tube according to claim 3 the deflecting electrodes being subdividedin many circular sectors electrically insulated and energized by different sources.

10. An oscillograph cathode ray tube having two co-axial electrobeam systems as indicated in claim 1, the corresponding two electron guns being located at the top and at the bottom respeclindrical fluorescent screen by means of a -rotating electric field superimposed upon a rotating =magnetic fleld, the electric ileld .being created by electrodes symmetrically placed-with respect to the axis of the tube and energized by polyphase voltages and the magnetic rotating field being created by coils symmetrically; placed withrespect to-theaxis of the tube and traversed by polyphase currents-symmetrically placed with revspect to the axis of the tube along which an electron gun is projecting an electron beam; the said electron :beam being bent normally to the axis of 'thetube by means; of corolla shaped electrodes symmetrically located withrespect to the axis of the tube; 'thesaid electron beam [being deflected .by two deflecting ring shaped electrodes, con- 'centricand essentially parallel .to one another symmetricallylocated :with respect to the axis of the tube; -the;vac uumtube being itself cylindrically shaped and bearing the fluorescent screen along its cylindrical wall.

4. An oscillogra-ph cathode ray tube as de-' scribed in claim land where at the corolla outlet acylindrical electric lens is placed formed-by twoparallel-concentric rings. v

5. An oscillograph cathode ray tube as described in claim- 2 and where at the corolla outlet a cylindrical electric lens is placed formed by two parallel concentric rings; r I

6. 'An oscillograph cathode ray 1 tube as described in claim 3 and where at the corolla outlet a cylindrical electric lens is placed formed by two parallel concentric rings.

tively of the'tub'e and the time axes being two parallel circles on the cylindrical screen. 4 'llh'An oscillograph. cathode ray tube having two co-axial electron beam systems as indicated in'lclaim; 2, the corresponding two electron guns .being'. located atQthe top andat the bottom respectively' of; thegtube and the time axes being two parallel circles on the cylindrical screen;

12. ,An,;\oscillograph cathode ray tube having two co-axial electron beam systems as indicated in claim :3, the corresponding twoelectron guns being; located .atthe utop and at the bottom respectively of the tube and the time axes being two parallel'circles onthe cylindricaly'screen;

' 13. An oscillograph cathode ray tube having an electron beamxsystem as described in claim 1 and having its-fluorescent, cylindrical screen'ex- .7 tending only along a segment. of the cylinder.

:14. :An oscillograph cathode ray tubehaving an electron beam system as, described in claim 2 and having its cylindrical-fluorescent screen extending only along ,a segment of the cylinder.

15.- An oscillograph cathode ray tuberhaving an electron beam system as described inclaim -3 and having its cylindrical fluorescent screen extending only along a segment of the cylinden;

Number ANDREA PINCIROLI:

. @REFERENCESCITED The following reie'r ences'are of record in the file "ofthis patent: r s

. :UNITEDTSTA'IEHS PArENTsT Name- Date 1,962,873

Parker June12, 1934 I