US2464076A - Electron-ray tube - Google Patents

Electron-ray tube Download PDF

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Publication number
US2464076A
US2464076A US681832A US68183246A US2464076A US 2464076 A US2464076 A US 2464076A US 681832 A US681832 A US 681832A US 68183246 A US68183246 A US 68183246A US 2464076 A US2464076 A US 2464076A
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United States
Prior art keywords
plates
electrodes
electrode
respect
anode
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Expired - Lifetime
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US681832A
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English (en)
Inventor
Gier Johannes De
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Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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    • 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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/82—Mounting, supporting, spacing, or insulating electron-optical or ion-optical arrangements

Definitions

  • the electrode-,system for producing and focussing a directed electron beam in electronray tubes comprises a certain number of electrodes which. by means of a mounting jig, can be easily and exactly adjusted at the required distance from each other and symmetrically with respect to the axis of the beam.
  • 'I'he method adopted is mostly such that first of all the electrode-system parts having rotational symmetry are provided on a mounting pin having a suitable shape and maintained in the desired position by means of a clamping device. After attachment of the said parts to the supporting members the mounting pin is removed and then the pairs of deiiecting plates are provided.
  • electrode-systems comprising a control electrode, a first anode and in addition a stop which exhibits a small aperture bounding the section of the beam.
  • this stop should be located at some distance from the first anode, it being of importance that this distance is large in comparison with the distance between the first anode and the control electrode. It is customary that both of these electrodes also consist of stops having a small aperture; however, the directional effect of this electrode-combination is very small, since the electrodes must be placed close together.
  • the defiecting plates must be placed exactly symmetrically with respect to the axis of the beam. In this case the maximum deflection sensitiveness is obtained, since the distance between the plates may be reduced to a minimum. The limit to which one may go in reducing this distance is determined by the maximum deviation required by the beam for making the spot of light appear at the edges of the projection screen. when the plates are not yet allowed to intercept electrons from the beam. Due to unsymmetrical positioning of the plates with respect to the axis of the beam it may occur that the beam is capable of deviating over ⁇ a larger angle in one direction than in the opposite direction. In this case, however, the beam is intercepted by one of the edges of the plate, before the spot of light has reached the edge of the projection screen.
  • the plates In such tubes the plates must be positioned symmetrically with respect to the axes of the beams and in addition care must be taken that one pair of plates in each system extends exactly normal to the line connecting the centres of the apertures of the stops bounding the beams.
  • the plates of the other pair of plates which may be common to the various systems, must extend parallel with this line. If the last-mentioned plates are placed a little obliquely this causes a slight deviation in the distance between the lines described on the screen as a result of the application of a variable voltage to these plates. However the lines remain parallel. If, however, the plates by which the beams are caused to deviate in the direction of the connecting line of the stops are not exactly normal to this line.
  • central plane is to be understood to-mean the plane extending between the plates of a pair of plates, with respect to which the plates are placed symmetrically.
  • the invention has for its object a structural improvement of electrode-systems for electronray tubes. as a result of which mounting errors cany be easily kept within the permissible tolerances.
  • the stop bounding the beam and. as the case may be, one or more electrodes forming part of the same electrode-system. together with the pair of plates most remote from the projection screen are assembled to form a unit distinct from the remaining electrodes. Of the remaining electrodes at least the control electrode and the first anode form an assembly.
  • Figure 1 represents an electrode system for a tube having one electron-ray.
  • Figure 2 representing an electrode system such as may be used in tubes wherein.- twoelectron-beams are produced.
  • the electrode system shown in Figure 1 comprises two parts I and II which are interconnected by thin metal rods I.
  • the electrodes, of which the control electrode is denoted by 2, the first anode by 3. the accelerating electrode by 4 and the stop bounding the beam by 5, are fastened in plates 6. If the supporting rods 'I consist of insulating material these plates 8 can be made from metal.
  • the plates are ilxed by means of bushings 8 clamped about the supporting rods and the displacement of the bushings can be prevented by means of a suitable cement.
  • the rods secured to the stop 5 carry also the pairs of deecting plates 9 and I0.
  • the whole of the system is secured to the stem of the tube by means of a clamping ring I l; holders l2, which are secured to the clamping ring and project in a lateral direction. act as supports for members l.
  • the mounting may take place as follows.
  • the electrodes 2, 3 and 4 are slipped on a mounting pin preferably consisting of a cylindrical metal rod whose diameter is chosen in such a manner that the electrodes 3 and I are a tight fit.
  • One end of the rod comprises a thinner cylindrical part whose diameter corresponds to the aperture in the first anode stop. This portion must be accurately centered with respect to the centre placed in tandem are caused to fall on a screen,
  • the cylindrical first anode 3 is slipped on the pin and after that a bushing is placed on the thin portion, the height of this bushing determining the distance between the first anode and the control electrode. After that the control electrode is slipped on the thin portion of the pin and the electrodes are maintained in this position, e. g., by means of an elastic clamping ring.
  • the electrode 4 is slipped on the pin from the other end with the interposition of a bushing and is pushed against the rst anode by means of a suitable clamping device, the electrodes being previously furnished with supporting plates 6( After that the supporting members 1, on which the required clamping rings may be slipped beforehand, are placed along the supporting plates and the tags of the bushings on the rods are connected to the plates by welding.
  • a suitable cement capable of being hardened or glazed. for instance by heating, displacement of the bushings is prevented.
  • a mounting jig For mounting the portion 2, use is made of a mounting jig, by means of which the plates of the irst pair of plates 9 can be exactly adjusted, and which comprises a cylindrical part Whose centre line represents the axis of the beam; the diameter thereof corresponds to that of the aperture in the stop 5 bounding thebeam.
  • the thin cylindrical part of the jig may have such a length as to extend into the aperture of 5 the iirst anode after the two system parts have been brought into alignment at the desired distance between the electrodes 4 and 6.
  • the mounting pin used for the portion II must be removed beforehand. In this construction the adjustment of the two parts relative to each other may take place with sufiicient accuracy by means of the eye.
  • the pin connected to the mounting jig assures an excellent conduction, so thatacorrect adjustment of the pair of plates with respect to the axis of the beam is always insured.
  • the stop l and the cylindrical accelerating electrode 4 have the same potential, so that the positioning of the stop does not affect the electric field of the projection lens between the first anode 3 and this cylindrical part.
  • the plates I of the second pair of plates are provided, which can be adjusted with suiiicient accuracy by means of a separate jig.
  • this jig likewise comprises a positioning member in the form oi' a thin cylindrical pin extending through the aperture of the stop l into the aperture of the first anode.
  • the plates are connected by metal strips I3 to the supporting members of the part I.
  • the parts I and II may be slightly displaced relative to one another if some correction should prove to be necessary. In the system thus established, for a single beam tube this will usually not be necessary.
  • the electrodes may be mounted in the same manner.
  • the separation between the portions I and II of the electrode system takes place at a point different from that in the form of construction represented in Figure 1.
  • the portion II comprises the control electrodes 2 and stops I5 to which the ilrst anode voltage is applied during operation of the tube.
  • the stops I are separated from the cylindrical members 3 so that on displacing the portions I and II with respect to one another these members are displaced relative to the stops. These members receive the same voltage as the stops so that there is no electric field therebetween in which otherwise the shifting of the lines of force with the displacement might adversely aifect focusing.
  • the projection lens is formed between the cylindrical electrodes 3 and 4 which can be acccurately adjusted with respect to one another by means of a cylindrical rod-shaped mounting pin and are secured to the supporting members 1 in this position. Together with the electrodes 4, the stops 5 bounding the beams are assembled to form a unit. After that the pairs of plates 9 and l0 are provided, particular care being taken to position accurately the plates l which must extend exactly perpendicularly to the connecting line of the stops.
  • the position of the deilecting plates must remain the same and in addition the electrodes, between which are set up the electric fields bringing about the lens eifect, should not change their place when the portions I-II of the system are to be slightly twisted with respect to one another for obtaining the correct adjustment. This is achieved by placing in different sections from each other the first anode stop and the cylindrical part having the same potential during operation of the tube. The plane of separation of the system parts extends between these two electrodes.
  • the adjustment takes place, and care has to be taken that the line connecting the centres oi the apertures in the stops bounding the beams extends parallel with the connecting line of the centres of the apertures in the iirst anode stops.
  • the correct adjustment can be approximated by vmeans of the available mechanical means. The accuracy attained is sufficient with respect to the parallelism of the axes of the beams.
  • a jig for the adjustment of the plates comprising a long thin pin which extends into the aperture of the first anode stop. Applicant has found, however, that the crossing of the axes of the beams can never be avoided completely.
  • I'his defect may be found in the optical final inspection but in the common systems it can no longer be corrected at this moment without affecting the correct adjustment of the pairs of plates.
  • the invention permits this correction to be made without altering the position of the deilecting electrodes with respect to the stops.
  • the invention is of particular importance for cathode ray tubes for measuring purposes.
  • the voltage to be measured or a voltage corresponding with the characteristic to be measured, is applied between the plates of one pair of plates, whereas the other pair of plates, which brings about a deviation of the beam in a direction normal to the deviation brought about by the ilrst pair of plates, receives a voltage varying as a function of time.
  • the mounting of the first-mentioned pair of plates requires most care, so that it will be located nearest the stop bounding the beam.
  • the supply conductors are not represented in these forms of construction. They are preferably provided before the final inspection of the system since otherwise their attachment may aiIect the positioning of the electrodes.
  • the invention is not limited to the supporting members for the electrodes used in these forms of construction. It may also be utilized for other supporting purposes, for instance when using gauge rings of insulating material, such as the material sold under the registered trade-mark calite, having such a shape as to engage each other perfectly while clamping the electrodes.
  • the two parts of the electrode system according to the invention may be mounted each individually on the stem of the tube.
  • the manner of attachment of the electrodes is not essential when providing joints between the system parts, which permit a slight displacement of one part with respect to the other.
  • An electrode assembly for a cathode ray tube to direct a beam of electrons comprising a ilrst portion having electrical elements comprising a control electrode and a ilrst anode, a second portion having electrical elements more distant from said control electrode than said first anode, said second portion elements comprising a stop through which said beam passes and a pair of deilection plates, and means mechanically lnterconnecting said elements and having a part thereof relatively more easily deformable than the other p arts thereof and arranged upon deformation of said' part to relatively move said ilrst portion with respect to said second portion, one said element of one portion being positioned next to one said element of the other said portion and being electrically directly connected thereto to provide a field-free space for the passage of the electron beam between said two portions.
  • An electrode assembly for a cathode ray tube to direct a beam of electrons comprising a first portion having electrical elements comprising a control electrode and a first anode, a second portion having electrical elements more distant from said control electrode4 than said first anode comprising a stop through which said beam passes and a pair of deflection plates, and means mechanically interconnecting said elements and comprising rod-like members positioned substantially parallel to the beam, said members having a part thereof more easily deformable than the other parts thereof and arranged upon deformation of said part to relatively move said rst portion with respect to said second portion, one said element of one portion being positioned next to one said element of said other portion and being electrically directly connected to provide a field-free space for the passage of the electron beam between said two portions.

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  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
US681832A 1943-04-21 1946-07-08 Electron-ray tube Expired - Lifetime US2464076A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL252006X 1943-04-21

Publications (1)

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US2464076A true US2464076A (en) 1949-03-08

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US681832A Expired - Lifetime US2464076A (en) 1943-04-21 1946-07-08 Electron-ray tube

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US (1) US2464076A (enrdf_load_stackoverflow)
BE (1) BE455394A (enrdf_load_stackoverflow)
CH (1) CH252006A (enrdf_load_stackoverflow)
DE (1) DE852423C (enrdf_load_stackoverflow)
FR (1) FR903554A (enrdf_load_stackoverflow)
GB (1) GB622492A (enrdf_load_stackoverflow)
NL (1) NL70855C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753484A (en) * 1952-07-29 1956-07-03 Itt Signal indicating device
US2949556A (en) * 1959-06-19 1960-08-16 Westinghouse Electric Corp Electron discharge device
US3004183A (en) * 1957-12-03 1961-10-10 Itt Electron gun
US3066235A (en) * 1959-11-12 1962-11-27 Gen Dynamics Corp Means for influencing selectively the cross section and the horizontal and vertical position of a cathode ray electron beam
US3213310A (en) * 1961-10-17 1965-10-19 Westinghouse Electric Corp Electron gun structural support
US3684910A (en) * 1970-05-18 1972-08-15 Itt Electron multiplier having dynode modules

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093492B (de) * 1958-08-13 1960-11-24 Telefunken Gmbh Verfahren zur Herstellung eines aus mehreren Elektroden bestehenden Elektrodenystemsfuer Elektronenstrahlroehren
GB2144574B (en) * 1983-07-13 1986-11-19 English Electric Valve Co Ltd Improvements in or relating to electron guns

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058293A (en) * 1934-03-26 1936-10-20 Emi Ltd Cathode ray tube
GB483435A (en) * 1936-06-27 1938-04-20 Philips Nv Improvements in cathode ray tubes
US2185807A (en) * 1937-04-30 1940-01-02 Gen Electric Cathode ray tube
US2391273A (en) * 1942-05-29 1945-12-18 Du Mont Allen B Lab Inc Deflecting plate for cathode ray tubes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2058293A (en) * 1934-03-26 1936-10-20 Emi Ltd Cathode ray tube
GB483435A (en) * 1936-06-27 1938-04-20 Philips Nv Improvements in cathode ray tubes
US2185807A (en) * 1937-04-30 1940-01-02 Gen Electric Cathode ray tube
US2391273A (en) * 1942-05-29 1945-12-18 Du Mont Allen B Lab Inc Deflecting plate for cathode ray tubes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2753484A (en) * 1952-07-29 1956-07-03 Itt Signal indicating device
US3004183A (en) * 1957-12-03 1961-10-10 Itt Electron gun
US2949556A (en) * 1959-06-19 1960-08-16 Westinghouse Electric Corp Electron discharge device
US3066235A (en) * 1959-11-12 1962-11-27 Gen Dynamics Corp Means for influencing selectively the cross section and the horizontal and vertical position of a cathode ray electron beam
US3213310A (en) * 1961-10-17 1965-10-19 Westinghouse Electric Corp Electron gun structural support
US3684910A (en) * 1970-05-18 1972-08-15 Itt Electron multiplier having dynode modules

Also Published As

Publication number Publication date
FR903554A (fr) 1945-10-09
CH252006A (de) 1947-11-30
DE852423C (de) 1952-10-16
GB622492A (en) 1949-05-03
NL70855C (enrdf_load_stackoverflow)
BE455394A (enrdf_load_stackoverflow)

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