US2975326A - Cathode-ray tubes - Google Patents

Cathode-ray tubes Download PDF

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Publication number
US2975326A
US2975326A US834169A US83416959A US2975326A US 2975326 A US2975326 A US 2975326A US 834169 A US834169 A US 834169A US 83416959 A US83416959 A US 83416959A US 2975326 A US2975326 A US 2975326A
Authority
US
United States
Prior art keywords
plates
cathode
pair
deflector
sensitivity
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
Application number
US834169A
Other languages
English (en)
Inventor
Burn Kenneth Collett
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ferranti International PLC
Original Assignee
Ferranti PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ferranti PLC filed Critical Ferranti PLC
Application granted granted Critical
Publication of US2975326A publication Critical patent/US2975326A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/72—Arrangements for deflecting ray or beam along one straight line or along two perpendicular straight lines
    • H01J29/74—Deflecting by electric fields only

Definitions

  • This invention relates to cathode-ray tubes of the kind utilising electrostatic deflection of the electron beam and having first and second pairs of deflector plates in that order from the electron gun.
  • the first pair of deflector plates usually has the greater deflection sensitivity and therefore the signal to be observed is applied to this pair, the time base signal being applied to the second pair of plates.
  • the user it is desirable for the user to be able to adjust the deflection sensitivity of this pair of plates to increase the sensitivity to observe weak signals.
  • the manufacturer it is sometimes necessary for the manufacturer to be able to adjust the sensitivity of the plates to match the tube with several other tubes.
  • a cathode-ray tube of the kind specified includes two metallic plates disposed between the first and second pairs of deflector plates normal to the direction of the electron beam in its undeflected condition, each of said plates containing an aperture through which the electron beam passes, and electrical connections to said two plates whereby in operation an adjustable potential diflerence may be applied between said two plates to form an electron lens capable of determining the sensitivity of the first pair of deflector plates.
  • the cathode-ray tube includes an envelope of known form comprising a conical portion 1 with a screen (not shown) at the base of the cone and an elongated neck 2 at the apex.
  • the electrode system is mounted in the neck of the envelope and includes the usual electron gun 3 for producing an electron beam and first and second pairs of deflector plates 4 and 5 respectively.
  • two metallic plates 6 and 7 are mounted between the first and second pairs of deflector plates 4 and 5 normal to the electron beam in its undeflected position.
  • the plates 6 and 7 are provided with apertures 8 and 9 respectively through which the electron beam passes, the long edges of the apertures 8 and 9 lying parallel to the direction of deflection of the first pair 4 of deflector plates.
  • the plates 6 and 7 are provided with electrical connections 10 and 11 respectively to the exterior of the envelope so that an adjustable potential diflerence may be applied between the two plates 6 and 7 thus forming an electron lens.
  • the power and sign of this lens depend upon the magnitude and direction of the potential diflerence applied between the two plates 6 and 7 and by varying the potential difference the deflection sensitivity of the first pair 4 of deflector plates may be increased or decreased.
  • the two plates 6 and 7 are normally operated at approximately the mean deflector plate voltage, but by altering the voltage on one or both plates by a few hundred volts positive or negative a considerable change may be made in the deflection sensitivity of the first pair 4 of deflector plates with an electron beam of several kilovolts energy.
  • the two plates 6 and 7 serve to screen the first and second deflector plates-4 and 5 from each other so that the normal inter-plate shield may be omitted.
  • each of the two plates 6 and '7 need not necessarily be formed as a rectangular slot as shown in the drawing. It may, for example, be a circular aperture.
  • a cathode-ray tube of the kind having first and second pairs of electrostatic deflector plates in that order from the electron gun including two metallic plates disposed between said first and second pairs of deflector plates normal to the direction of the electron beam in its undeflected condition, each of said plates containing an aperture through which the electron beam passes, and electrical connections to said two plates for applying an adjustable potential difference between said two plates related to the mean deflector plate voltage to form an electron lens capable of varying the effective sensitivity of the first pair of deflector plates.
  • a cathode-ray tube as claimed in claim 1 in which said two plates each contain a rectangular aperture.

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  • Measurement Of Radiation (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US834169A 1958-08-26 1959-08-17 Cathode-ray tubes Expired - Lifetime US2975326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB27285/58A GB853830A (en) 1958-08-26 1958-08-26 Improvements relating to cathode-ray tubes

Publications (1)

Publication Number Publication Date
US2975326A true US2975326A (en) 1961-03-14

Family

ID=10257097

Family Applications (1)

Application Number Title Priority Date Filing Date
US834169A Expired - Lifetime US2975326A (en) 1958-08-26 1959-08-17 Cathode-ray tubes

Country Status (3)

Country Link
US (1) US2975326A (enrdf_load_stackoverflow)
GB (1) GB853830A (enrdf_load_stackoverflow)
NL (1) NL242517A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138736A (en) * 1960-04-16 1964-06-23 United Aircraft Corp Electron beam generator system
US5339003A (en) * 1992-06-22 1994-08-16 Principia Optics, Inc. Laser screen for a cathode-ray tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117965A (en) * 1982-02-05 1983-10-19 Philips Electronic Associated Electron beam deflector for a flat display tube

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114572A (en) * 1936-06-01 1938-04-19 Radio Inventions Inc Cathode ray ture system
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2114572A (en) * 1936-06-01 1938-04-19 Radio Inventions Inc Cathode ray ture system
US2572858A (en) * 1947-06-03 1951-10-30 Sylvania Electric Prod Electron optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3138736A (en) * 1960-04-16 1964-06-23 United Aircraft Corp Electron beam generator system
US5339003A (en) * 1992-06-22 1994-08-16 Principia Optics, Inc. Laser screen for a cathode-ray tube

Also Published As

Publication number Publication date
NL242517A (enrdf_load_stackoverflow)
GB853830A (en) 1960-11-09

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