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GB534465A - Improvements in or relating to magnetic focussing arrangements for cathode ray tubes - Google Patents

Improvements in or relating to magnetic focussing arrangements for cathode ray tubes

Info

Publication number
GB534465A
GB534465A GB21911/39A GB2191139A GB534465A GB 534465 A GB534465 A GB 534465A GB 21911/39 A GB21911/39 A GB 21911/39A GB 2191139 A GB2191139 A GB 2191139A GB 534465 A GB534465 A GB 534465A
Authority
GB
United Kingdom
Prior art keywords
valve
focussing
potential
grid
cathode ray
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
Application number
GB21911/39A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB21911/39A priority Critical patent/GB534465A/en
Priority to US351592A priority patent/US2291682A/en
Publication of GB534465A publication Critical patent/GB534465A/en
Expired legal-status Critical Current

Links

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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/66—Magnetic lenses using electromagnetic means only

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • X-Ray Techniques (AREA)
  • Details Of Television Scanning (AREA)

Abstract

534,465. Cathode-ray tubes. BLUMLEIN, A. D., and BLYTHEN, F. July 28, 1939, No. 21911. [Classes 39 (i) and 40 (iii)] To correct defocussin, in cathode ray tube with electromagneti focussing through varia tions in the resistance o the focussing coil or in the anode voltage of th tube the coil is supplied through a high-imped ance valve the curren through which is regu lated in accordance with the anode voltage of the tube. The necessary relation between the anode voltage and the grid potential of the valve is discussed in the Specification. Fig. 2 shows an arrangement whereby the focussing current may be adjusted without interfering with the connection. The focussing coil 1 is connected in series with a pentode 2 the screen grid of which is connected to a source of stabilized potential and the anode of the valve 11. The control grid of the pentode 2 is connected to a potentiometer 12 between a stabilized source of supply and the cathode of the valve 11. The grid of the valve 11 receives a definite fraction of the anode potential of the cathode ray tube determined by resistances 7, 9 and a source of stabilized potential 10.
GB21911/39A 1939-07-28 1939-07-28 Improvements in or relating to magnetic focussing arrangements for cathode ray tubes Expired GB534465A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB21911/39A GB534465A (en) 1939-07-28 1939-07-28 Improvements in or relating to magnetic focussing arrangements for cathode ray tubes
US351592A US2291682A (en) 1939-07-28 1940-08-06 Magnetic focusing arrangement for cathode ray tubes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB21911/39A GB534465A (en) 1939-07-28 1939-07-28 Improvements in or relating to magnetic focussing arrangements for cathode ray tubes

Publications (1)

Publication Number Publication Date
GB534465A true GB534465A (en) 1941-03-07

Family

ID=10170867

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21911/39A Expired GB534465A (en) 1939-07-28 1939-07-28 Improvements in or relating to magnetic focussing arrangements for cathode ray tubes

Country Status (2)

Country Link
US (1) US2291682A (en)
GB (1) GB534465A (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE972129C (en) * 1942-09-11 1959-05-27 Fernseh Gmbh Circuit arrangement for operating electron beam tubes with electromagnetic beam concentration
US2555147A (en) * 1945-09-14 1951-05-29 Ralph E Meagher Cathode-ray tube magnetic focusing
US2459602A (en) * 1946-12-24 1949-01-18 Westinghouse Electric Corp Circuit for stabilizing focus of magnetically focused cathoderay tubes
US2458891A (en) * 1947-01-11 1949-01-11 Philips Lab Inc Cathode-ray tube focusing circuit
US2698400A (en) * 1947-06-03 1954-12-28 Sylvania Electric Prod Generator for dynamic focusing of cathode ray tubes
US2656486A (en) * 1950-09-28 1953-10-20 Du Mont Allen B Lab Inc Stabilized television circuit
US2621305A (en) * 1951-01-02 1952-12-09 Rca Corp Cathode-ray tube power supply

Also Published As

Publication number Publication date
US2291682A (en) 1942-08-04

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