US3864585A - Vidicon having mesh on end of cylinder coaxial with anode - Google Patents

Vidicon having mesh on end of cylinder coaxial with anode Download PDF

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Publication number
US3864585A
US3864585A US376551A US37655173A US3864585A US 3864585 A US3864585 A US 3864585A US 376551 A US376551 A US 376551A US 37655173 A US37655173 A US 37655173A US 3864585 A US3864585 A US 3864585A
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US
United States
Prior art keywords
electrode
tube
target
anode
envelope
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 - Lifetime
Application number
US376551A
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English (en)
Inventor
Hans Scholz
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.)
Teledyne UK Ltd
Original Assignee
English Electric Valve 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 English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
Application granted granted Critical
Publication of US3864585A publication Critical patent/US3864585A/en
Anticipated expiration legal-status Critical
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    • 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
    • H01J29/92—Means forming part of the tube for the purpose of providing electrical connection to it

Definitions

  • the object of using a plurality of current paths is to achieve what may be termed mutually balancing pick-up, the undesirable effects of pick-up from the scanning fields on one current path being cancelled out or approximately so by opposing effects by another, diametrically opposed, current path.
  • multiple path tubes can be made with satisfactory immunity to the effects of voltage pick-up from the scanning fields of the tube, they are sensitive as regards orientation within the scanning coil yoke. This is a very serious defect indeed where such tubes are used in multiples in a colour camera, since it is quite commonly required to rotate the tubes about their longitudinal axis in order to optimise such parameters as geometry.
  • the present invention seeks to provide an improved vidicon of the kind referred to, which, whilst providing a satisfactory degree of immunity from the effects of voltage pick-up by the connection means to the field mesh, at the same time are relatively insensitive to their orientation within the scanning yoke.
  • connection means consists of a conductive cylindrical member connected to said mesh and extending part of the length of the tube and a plurality of current paths symmetrically distributed around the axis of the tube and extending from the end of said cylindrical member along the remaining length of said tube to a terminal at the base of the tube.
  • said conductive cylindrical member is coaxial with and surrounding the tubular anode electrode and extends at least approximately to the end of the effective length of said tubular anode electrode. Where, as is normally the case the tubular anode electrode is tapered at the end of its effective length, said conductive cylindrical member extends from the target mesh to the beginning of the taper.
  • the combined wall thickness of the conductive cylindrical member connected to the mesh and the tubular anode electrode should be made equal to the wall 2 thickness of the tubular anode electrode in the standard tube.
  • HO. 1 is an elevational view of a vidicon tube according to the invention.
  • FIG. 2 is a perspective view thereof with some parts omitted.
  • the target electrode of the vidicon camera shown therein is referenced l
  • the separate field mesh electrode is referenced 2
  • the envelope of the tube is referenced 3
  • the tubular anode electrode, or G3 as it is often called, is referenced 4
  • the pin which extends through the base glass of the tube to apply voltage to the field mesh 2 is referenced 5.
  • the remaining electrodes of the tube need not be referred to in detail and are represented schematically.
  • a conductive cylindrical member 6 of non-magnetic metal such as nickel-chrome is attached to the field mesh 2 and coaxially surrounds the cylindrical anode electrode 4.
  • Conductive cylindrical member 6 extends from the field mesh over the effective working length of the cylindrical anode electrode 4 to a position at which the anode electrode begins to taper.
  • two diametrically opposed wires 7 and 8 are attached to the cylindrical member 6 and extend towards the base of the tube where they are connected in parallel to the pin 5.
  • the relative length of the cylindrical member 6 to the insulated wires 7 and 8 is not critical, but it has been found that this may be optimised to provide maximum reduction ofline scan pick-up with minimum sensitivity to orientation within the scanning yoke.
  • the combined wall thickness of the conductive cylindrical member connected to the mesh and the tubular anode electrode should be made equal to the wall thickness of the tubular anode electrode in the standard tube.
  • thewall thickness of the tubular anode electrode in the known standard tube is 0.004 inch.
  • the tubular anode electrode 4 and the conductive cylindrical member 6 each have a wall thickness of 0.002 inch.
  • a vidicon tube including within an envelope, a target, a target electrode in electrical contact with the target, an anode of which the portion nearest the target is cylindrical, a field mesh electrically isolated from the positioned closely adjacent the target electrode between the target electrode and the cylindrical portion of the anode, terminal means passing through the envelope, and electrical connection means electrically con necting the terminal means to the field mesh; wherein, the electrical connection means includes a conductive cylindrical member coaxial with and surrounding the anode and extending at least approximately to the end of the cylindrical portion of the anode, the opposite end portions of the cylindrical member being electrically connected, respectively, to the perimeter of the field mesh and to a plurality of electrical conductors which are disposed symmetrically about the axis of the tubeand extend to the terminal means.
  • tubular anode electrode is tapered at the end of its cylindrical portion, and wherein said conductive cylindrical member extends from the field mesh to the beginning of the taper.
  • an electrically conductive, non-magnetic cylinder electrically connected at one end thereof to said field mesh electrode and extending therefrom in concentric, surrounding relation to said tubular anode electrode over at least a major portion of the length thereof; and at least a pair of electrical conductors connecting that end of said cylinder which is remote from said target electrode to said externally accessible electrode, said conductor being arranged symmetrically about the axis of the tube and said cylinder being of sufficient length as to provide maximum reduction ofline scan pick-up with minimum sensitivity to orientation of said tube within the scanning yoke.

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
US376551A 1972-07-06 1973-07-05 Vidicon having mesh on end of cylinder coaxial with anode Expired - Lifetime US3864585A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3166272A GB1356755A (en) 1972-07-06 1972-07-06 Camera tubes

Publications (1)

Publication Number Publication Date
US3864585A true US3864585A (en) 1975-02-04

Family

ID=10326522

Family Applications (1)

Application Number Title Priority Date Filing Date
US376551A Expired - Lifetime US3864585A (en) 1972-07-06 1973-07-05 Vidicon having mesh on end of cylinder coaxial with anode

Country Status (10)

Country Link
US (1) US3864585A (enExample)
JP (1) JPS4952915A (enExample)
AU (1) AU470397B2 (enExample)
CA (1) CA977405A (enExample)
CH (1) CH574164A5 (enExample)
FR (1) FR2192373B1 (enExample)
GB (1) GB1356755A (enExample)
IT (1) IT991665B (enExample)
NL (1) NL7309334A (enExample)
SE (1) SE386769B (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056754A (en) * 1975-03-01 1977-11-01 Electric Valve Company Limited Vidicon having switchable electrode connections
US20070066053A1 (en) * 2003-12-09 2007-03-22 Central Research Institute Of Electric Power Industry Method for producing substrate having carbon-doped titanium oxide layer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286121A (en) * 1962-01-15 1966-11-15 Electrical & Musical Ind Ltd Pick-up tube having a mesh electrode connected to the base by deflecting field neutralizing leads
US3321655A (en) * 1965-04-02 1967-05-23 Gen Electric Photoconductive pickup tube field mesh support

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3286121A (en) * 1962-01-15 1966-11-15 Electrical & Musical Ind Ltd Pick-up tube having a mesh electrode connected to the base by deflecting field neutralizing leads
US3321655A (en) * 1965-04-02 1967-05-23 Gen Electric Photoconductive pickup tube field mesh support

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4056754A (en) * 1975-03-01 1977-11-01 Electric Valve Company Limited Vidicon having switchable electrode connections
US20070066053A1 (en) * 2003-12-09 2007-03-22 Central Research Institute Of Electric Power Industry Method for producing substrate having carbon-doped titanium oxide layer
US7524791B2 (en) * 2003-12-09 2009-04-28 Central Research Institute Of Electric Power Industry Method for producing substrate having carbon-doped titanium oxide layer

Also Published As

Publication number Publication date
AU5785673A (en) 1975-01-09
DE2334517B2 (de) 1975-08-07
FR2192373A1 (enExample) 1974-02-08
NL7309334A (enExample) 1974-01-08
CH574164A5 (enExample) 1976-03-31
DE2334517A1 (de) 1974-01-17
AU470397B2 (en) 1976-03-11
IT991665B (it) 1975-08-30
GB1356755A (en) 1974-06-12
CA977405A (en) 1975-11-04
FR2192373B1 (enExample) 1978-07-21
SE386769B (sv) 1976-08-16
JPS4952915A (enExample) 1974-05-23

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