GB2015817A - Television camera tube - Google Patents

Television camera tube

Info

Publication number
GB2015817A
GB2015817A GB7904587A GB7904587A GB2015817A GB 2015817 A GB2015817 A GB 2015817A GB 7904587 A GB7904587 A GB 7904587A GB 7904587 A GB7904587 A GB 7904587A GB 2015817 A GB2015817 A GB 2015817A
Authority
GB
United Kingdom
Prior art keywords
volts
electrode
aperture
cathode
typically
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.)
Granted
Application number
GB7904587A
Other versions
GB2015817B (en
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB2015817A publication Critical patent/GB2015817A/en
Application granted granted Critical
Publication of GB2015817B publication Critical patent/GB2015817B/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
    • H01J29/48—Electron guns
    • H01J29/484—Eliminating deleterious effects due to thermal effects, electrical or magnetic fields; Preventing unwanted emission
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J31/00—Cathode ray tubes; Electron beam tubes
    • H01J31/08—Cathode ray tubes; Electron beam tubes having a screen on or from which an image or pattern is formed, picked up, converted, or stored
    • H01J31/26—Image pick-up tubes having an input of visible light and electric output
    • H01J31/28—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen
    • H01J31/34—Image pick-up tubes having an input of visible light and electric output with electron ray scanning the image screen having regulation of screen potential at cathode potential, e.g. orthicon
    • H01J31/38—Tubes with photoconductive screen, e.g. vidicon

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

The undesired production of fast electrons in known camera tubes which affects beam current inertia can be reduced further and dynamic beam current control may take place with a lower cathode load and with a smaller control signal by using a camera tube having a diode electron gun comprising, centred along an axis (5), successively a cathode (10), a first anode electrode (11) having an aperture which has a diameter at least twice as large as the diameter of an aperture (15) in a second anode electrode (12). The aperture (13) in the first electrode (11) is so dimensioned that a lens field formed between the first (11) and the second (12) electrodes has substantially no influence on the cathode emission. A positive voltage of between a few and a few tens of volts, typically 10 volts, is applied to the first electrode (11), and a positive voltage which is at least ten times higher, and which is at least 100 volts, typically 300 volts, is applied to the second electrode (12). Dimensions are specified, and sources of the fast electrons exemplified. <IMAGE>
GB7904587A 1978-02-13 1979-02-09 Television camera tube Expired GB2015817B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87708078A 1978-02-13 1978-02-13

Publications (2)

Publication Number Publication Date
GB2015817A true GB2015817A (en) 1979-09-12
GB2015817B GB2015817B (en) 1982-06-03

Family

ID=25369206

Family Applications (1)

Application Number Title Priority Date Filing Date
GB7904587A Expired GB2015817B (en) 1978-02-13 1979-02-09 Television camera tube

Country Status (5)

Country Link
JP (1) JPS54129871A (en)
CA (1) CA1118831A (en)
DE (1) DE2904865A1 (en)
FR (1) FR2417182A1 (en)
GB (1) GB2015817B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142777A1 (en) 1980-10-29 1982-07-08 Hitachi, Ltd. ELECTRONIC CANNON
US4549113A (en) * 1981-02-06 1985-10-22 U.S. Philips Corporation Low noise electron gun

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4540916A (en) * 1981-10-30 1985-09-10 Nippon Hoso Kyokai Electron gun for television camera tube
US4701679A (en) * 1985-08-23 1987-10-20 Hitachi, Ltd. Method of and apparatus for controlling amount of electron beam in image pickup tube

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3374379A (en) * 1964-03-02 1968-03-19 Nippon Columbia Low second grid voltage electron gun
BE759247A (en) * 1969-11-22 1971-05-21 Philips Nv DEVICE EQUIPPED WITH AN ELECTRONIC TUBE, AND ELECTRONIC TUBE INTENDED FOR SUCH A DEVICE
NL167801C (en) * 1970-09-04 1982-01-18 Philips Nv DEVICE WITH A TELEVISION CAMERA TUBE AND TELEVISION CAMERA TUBE FOR SUCH A DEVICE.
BE785749A (en) * 1971-07-02 1973-01-02 Philips Nv TELEVISION CAMERA TUBE (VIDICON) IN WHICH THE ADVERSE INFLUENCE OF THE RETURN BEAM IS COUNTERLED
US3831058A (en) * 1971-08-30 1974-08-20 Roosmalen J Van Device comprising a television camera tube and television camera
US3894261A (en) * 1973-07-09 1975-07-08 Hughes Aircraft Co No-crossover electron gun
GB1444062A (en) * 1974-06-08 1976-07-28 English Electric Valve Co Ltd Camera tubes

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3142777A1 (en) 1980-10-29 1982-07-08 Hitachi, Ltd. ELECTRONIC CANNON
US4549113A (en) * 1981-02-06 1985-10-22 U.S. Philips Corporation Low noise electron gun

Also Published As

Publication number Publication date
FR2417182A1 (en) 1979-09-07
JPH0213416B2 (en) 1990-04-04
CA1118831A (en) 1982-02-23
DE2904865C2 (en) 1987-12-10
GB2015817B (en) 1982-06-03
DE2904865A1 (en) 1979-08-16
JPS54129871A (en) 1979-10-08
FR2417182B1 (en) 1984-02-24

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Legal Events

Date Code Title Description
PE20 Patent expired after termination of 20 years

Effective date: 19990208