GB626671A - Improvements in and relating to anode structures for cathode ray tubes - Google Patents

Improvements in and relating to anode structures for cathode ray tubes

Info

Publication number
GB626671A
GB626671A GB33138/46A GB3313846A GB626671A GB 626671 A GB626671 A GB 626671A GB 33138/46 A GB33138/46 A GB 33138/46A GB 3313846 A GB3313846 A GB 3313846A GB 626671 A GB626671 A GB 626671A
Authority
GB
United Kingdom
Prior art keywords
apertures
tube
ray tubes
electron
cathode
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
GB33138/46A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB626671A publication Critical patent/GB626671A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
    • H01J37/147—Arrangements for directing or deflecting the discharge along a desired path
    • H01J37/15—External mechanical adjustment of electron or ion optical components
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J21/00—Vacuum tubes
    • H01J21/02—Tubes with a single discharge path
    • H01J21/06—Tubes with a single discharge path having electrostatic control means only
    • H01J21/08—Tubes with a single discharge path having electrostatic control means only with movable electrode or electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
    • H01J37/02—Details
    • H01J37/04—Arrangements of electrodes and associated parts for generating or controlling the discharge, e.g. electron-optical arrangement, ion-optical arrangement
    • H01J37/09—Diaphragms; Shields associated with electron or ion-optical arrangements; Compensation of disturbing fields

Landscapes

  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Electron Sources, Ion Sources (AREA)

Abstract

626,671. Cathode-ray tubes. BRITISH THOMSON-HOUSTON CO., Ltd. Nov. 7, 1946, No. 33138. Convention date, Nov. 10, 1945. [Class 39 (i)] An anode structure for a cathode-ray tube, such as an electron microscope or an electron diffraction instrument, comprises a movable portion having a plurality of apertures therein, a fixed portion, means for maintaining an electrical connection between the portions, and means external to the envelope of the tube, whereby the position of the movable portion may be varied to direct the electron beam through a selected one of the apertures on to a viewing screen. Fig. 2 shows a plan of an anode and Fig. 4 shows a section along the line 4-4. The fixed portion 12 has an aperture 15 which is covered by the movable disc 16 containing two holes 17, 18, one approximately four times the diameter of the other. The disc 16 may be moved by two rods 25, 26, which bear on rods 29 operated from outside the tube by a rack and pinion. In this way either of the two apertures 17, 18 can be brought into the path of the electron beam; the larger aperture may be used for focusing and the smaller for electron diffraction experiments.
GB33138/46A 1945-11-10 1946-11-07 Improvements in and relating to anode structures for cathode ray tubes Expired GB626671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US627954A US2443021A (en) 1945-11-10 1945-11-10 Movable anode structure

Publications (1)

Publication Number Publication Date
GB626671A true GB626671A (en) 1949-07-19

Family

ID=24516804

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33138/46A Expired GB626671A (en) 1945-11-10 1946-11-07 Improvements in and relating to anode structures for cathode ray tubes

Country Status (2)

Country Link
US (1) US2443021A (en)
GB (1) GB626671A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2510349A (en) * 1948-11-01 1950-06-06 Rca Corp Rod-type specimen stage for electron optical instruments
US2606292A (en) * 1950-05-12 1952-08-05 Gen Electric Method and apparatus for combined electron microscope and diffraction
US3292041A (en) * 1962-07-02 1966-12-13 Hitachi Ltd Multistage type high voltage electron gun with controllable electrode spacing
US3275748A (en) * 1963-12-23 1966-09-27 Gen Electric Electron beam-defining device and method for producing the same

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2290531A (en) * 1937-10-14 1942-07-21 Rca Corp Mechanically controlled discharge tube
DE895350C (en) * 1938-11-06 1953-11-02 Siemens Ag electron microscope
US2352043A (en) * 1940-01-15 1944-06-20 Ardenne Manfred Von Diaphragm for electron optical apparatus

Also Published As

Publication number Publication date
US2443021A (en) 1948-06-08

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