GB831943A - Improvements relating to electron discharge devices - Google Patents

Improvements relating to electron discharge devices

Info

Publication number
GB831943A
GB831943A GB1284055A GB1284055A GB831943A GB 831943 A GB831943 A GB 831943A GB 1284055 A GB1284055 A GB 1284055A GB 1284055 A GB1284055 A GB 1284055A GB 831943 A GB831943 A GB 831943A
Authority
GB
United Kingdom
Prior art keywords
lens
target
electron discharge
electrostatic
magnetic
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
GB1284055A
Inventor
Michael Edward Haine
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries 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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Priority to GB1284055A priority Critical patent/GB831943A/en
Publication of GB831943A publication Critical patent/GB831943A/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)
  • Electron Sources, Ion Sources (AREA)

Abstract

831,943. Cathode-ray tubes. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. May 3, 1956 [May 3, 1955], No. 12840/55. Class 39(1). An electron discharge device such as a television camera tube comprises an electron gun 3, 4 adapted to project a beam on to a non- secondary emissive target 2, means 6, 7 for deflecting the beam over the target, a first lens 5 adapted to focus the beam at a point C beyond the target, and a second lens 8 with its principal focus at the effective centre of deflection E, the relation v = u#/u + f being satisfied whereby the beam is focused on the target and impinges substantially normally thereon. The first lens may be magnetic or electrostatic the second lens being preferably an iron shrouded coil having a diameter more than twice that of the scanned area to reduce pin-cushion distortion. The deflecting means may be electrostatic or magnetic.
GB1284055A 1955-05-03 1955-05-03 Improvements relating to electron discharge devices Expired GB831943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1284055A GB831943A (en) 1955-05-03 1955-05-03 Improvements relating to electron discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1284055A GB831943A (en) 1955-05-03 1955-05-03 Improvements relating to electron discharge devices

Publications (1)

Publication Number Publication Date
GB831943A true GB831943A (en) 1960-04-06

Family

ID=10012096

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1284055A Expired GB831943A (en) 1955-05-03 1955-05-03 Improvements relating to electron discharge devices

Country Status (1)

Country Link
GB (1) GB831943A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5039923A (en) * 1988-10-19 1991-08-13 Hitachi, Ltd. Focus adjusting device for projection display

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5039923A (en) * 1988-10-19 1991-08-13 Hitachi, Ltd. Focus adjusting device for projection display

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