GB495707A - Improvements in or relating to focussing systems for use in electric discharge tubes - Google Patents

Improvements in or relating to focussing systems for use in electric discharge tubes

Info

Publication number
GB495707A
GB495707A GB11003/37A GB1100337A GB495707A GB 495707 A GB495707 A GB 495707A GB 11003/37 A GB11003/37 A GB 11003/37A GB 1100337 A GB1100337 A GB 1100337A GB 495707 A GB495707 A GB 495707A
Authority
GB
United Kingdom
Prior art keywords
lens
focused
cathode
relating
screen
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
GB11003/37A
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 GB11003/37A priority Critical patent/GB495707A/en
Priority to US200284A priority patent/US2240120A/en
Publication of GB495707A publication Critical patent/GB495707A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J35/00—X-ray tubes
    • H01J35/02—Details
    • H01J35/14—Arrangements for concentrating, focusing, or directing the cathode ray
    • 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
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Abstract

495,707. Cathode - ray tubes ; Rontgen-ray tubes. NICOLL, F. H. April 17, 1937, No. 11003. [Class 39 (i)] The ratio of voltages applied to the electrodes 7, 8 of a single electron lens is so high that the beam is brought to an intermediate focus within the lens field and is further focused at a point which is free from the lens field. The beam may be emitted from a thermionic cathode 5 or from a photo-electric cathode upon which an image is projected. In the form shown, the beam is focused by the cylinders 7, 8 on to the anticathode 9. The lens may comprise two apertured diaphragms, and the beam may be focused onto a fluorescent screen or onto a mosaic screen in a transmitting tube. An image of an object, such as a grid, placed within the cylinder 7 may be produced on the screen. The voltage ratio is greater than 70 to 1 and may be as great as several thousand to one. The Specification contains examples of voltages and dimensions of the electrodes.
GB11003/37A 1937-04-17 1937-04-17 Improvements in or relating to focussing systems for use in electric discharge tubes Expired GB495707A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB11003/37A GB495707A (en) 1937-04-17 1937-04-17 Improvements in or relating to focussing systems for use in electric discharge tubes
US200284A US2240120A (en) 1937-04-17 1938-04-06 Electron device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB11003/37A GB495707A (en) 1937-04-17 1937-04-17 Improvements in or relating to focussing systems for use in electric discharge tubes

Publications (1)

Publication Number Publication Date
GB495707A true GB495707A (en) 1938-11-17

Family

ID=9978259

Family Applications (1)

Application Number Title Priority Date Filing Date
GB11003/37A Expired GB495707A (en) 1937-04-17 1937-04-17 Improvements in or relating to focussing systems for use in electric discharge tubes

Country Status (2)

Country Link
US (1) US2240120A (en)
GB (1) GB495707A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417850A1 (en) * 1978-02-15 1979-09-14 Tektronix Inc ELECTRON DISCHARGE DEVICE, WITH DYNAMIC FOCUS CORRECTION

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE461891A (en) * 1943-12-31
NL69809C (en) * 1946-05-09
CH272088A (en) * 1947-02-11 1950-11-30 Dent Ott Walter Dr Med X-ray equipment.
GB730803A (en) * 1951-11-08 1955-06-01 Licentia Gmbh Improvements in and relating to x-ray tubes
US3233144A (en) * 1962-02-01 1966-02-01 Nippon Electric Co Electrostatic lens for magnifying deflection of electron beams or the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2417850A1 (en) * 1978-02-15 1979-09-14 Tektronix Inc ELECTRON DISCHARGE DEVICE, WITH DYNAMIC FOCUS CORRECTION

Also Published As

Publication number Publication date
US2240120A (en) 1941-04-29

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