US3813572A - Camera tube convertible from integral mesh to separate mesh type - Google Patents

Camera tube convertible from integral mesh to separate mesh type Download PDF

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Publication number
US3813572A
US3813572A US00325458A US32545873A US3813572A US 3813572 A US3813572 A US 3813572A US 00325458 A US00325458 A US 00325458A US 32545873 A US32545873 A US 32545873A US 3813572 A US3813572 A US 3813572A
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US
United States
Prior art keywords
tube
conductors
wall anode
envelope
mesh
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
US00325458A
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English (en)
Inventor
H 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 US3813572A publication Critical patent/US3813572A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • 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

Definitions

  • a camera tube has a wall anode and a mesh electrode which is separate from the wall anode.
  • connection is made to the mesh electrode from a terminal outside the tube envelopeby means of two diammetrically opposed conductors which are connected to the wall anode by fuses which after completion of manufacture may be fused to convert the tube from one of the integral mesh type to one of the separate mesh type.
  • This invention relates to camera tubes and more specifically to camera tubes having a wall anode electrode connected to a terminal external of the tube envelope and a mesh electrode disposed in front of said wall anode electrode.
  • An example of a camera tube of the above kind, and to which the present invention is particularly applicable, is a camera tube of the kind known under the Registered Trade Mark Leddicon.
  • a common arrangement for applying potential to the aforementioned mesh is to connect the mesh across the wall anode electrode, so that the potential applied thereto is that applied tothe wall anode electrode.
  • FIG. I of the accompanying drawing Such an arrangement is schematically illustrated in FIG. I of the accompanying drawing in which 1 represents the wall anode electrode 2 the mesh electrode connected thereacross so as to exhibit the same potential as the wall anode electrode and 3 is a terminal external of the tube envelope to which potential for the wall anode 1 and other electrode 2 may be applied.
  • a tube thus arranged is usually referred to as an integral mesh type tube.
  • FIG. 2 of the accompanying drawing Such an arrangement is illustrated in FIG. 2 of the accompanying drawing, in which reference numberals 1, 2, and 3 refer to parts similarly referenced in FIG. 1.
  • the mesh electrode 2 is separated from the wall anode electrode 1 and is connected to a further terminal 4 external of the tube envelope, by two diametrically opposed conductors 5 and 6.
  • a tube so arranged is usually referred to as a separate mesh type tube.
  • the present invention seeks to provide an improved camera tube of the kind referred to, which may be converted from a tube having characteristics of an integral mesh tube to one of the separate mesh type, whilst avoiding or reducing the aforementioned difficulty.
  • a camera tube of the kind referred to wherein the mesh electrode is separated from the wall anode electrode and has two substantially diametrically opposed conductors extending therefrom to afurther terminal, external of the tube envelope, fusible means, internal of the tube envelope, being provided electrically to connect said wall anode to said two diametrically opposed conductors, whereby the said camera tube, after completion of manufacture, may be converted from a tube exhibiting characteristics of the integral mesh type to a'separate mesh type by fusing said fusible means.
  • the aforementioned fusible means should be provided between the wall anode electrode and the said two conductors as close as possible to the mesh electrode.
  • said fusible means comprises two thin strips of platinum, one extending between one of said conductors and the wall anode electrode and the other extending between the other of said two conductors and the wall anode electrode, whereby theaforementioned conversion of the said tube may be accomplished by passing a suitable current'between the said two terminals externally of the tube envelope.
  • further fusible means is provided in at least one of said two conductors.
  • said first mentioned fusible means comprises two platinum strips as above described and conversion is to be carried out by passing a current between said two external terminals said further fusible means is provided to have a current carrying capacity greater than that of the fusible strip between the wall anode and the conductor in which the further fusible means is provided.
  • the tube is required to be one exhibiting the characteristics of an integral mesh type tube the further fusible means isfused by RP. heating or other convenient means after manufacture, whilst leaving the first mentioned fusible means intact.
  • FIG. 3 of the accompanying drawings in which again like references are used for like parts in FIGS. 1 and 2.
  • the tube illustrated in FIG. 3 is similar to the tube illustrated in FIG. 2 except for the provision of fusible thin platinum strips 7 and 8, between the wall anode 2 and conductors 5 and 6 respectively.
  • a further fusible thin platinum strip 9 is included in the length of conductor 6. Fusible platinum strip 9 is provided to carry a heavier current than the fusible platinum'strip 8 to ensure that the strip 8 fuses before the strip 9, when a suitable current is passed between terminals 3 and 4.
  • a camera tube including an evacuated envelope a wall anode within said envelope a mesh electrode disposedaxially in front of said wall anode and separate therefrom, two substantially diametrically opposed conductors electrically connected to said mesh electrode and extending axially therefrom and first and second terminal means external of the tube envelope connected through said envelope said first terminal means to said wall anode, and said second terminal means to said two conductors and wherein there is provided within said envelope fusible means electrically connecting said wall anode to at least one of said two diametrically opposed conductors to enable electrical isolation of said mesh electrode from the wall anode subsequent to manufacture.
  • a tube as claimed in claim 1 and wherein said fusible means comprises two thin strips of platinum, one extending between one of said conductors and the wall anode electrode and the other extending between the other of said two conductors and the wall anode electrode, whereby the aforementionedconversion of the said tube may be accomplished by passing a suitable the tube envelope.
  • a tube as claimed in claim 1 and wherein said fusible means comprises two thin strips of platinum, one extending between one of said conductors and the wall anode electrode and the other extending between the other of said two conductors and the wall anode electrode, whereby the aforementioned conversion of the said tube may be accomplished by passing a suitable current between the said two terminals externally of the tube envelope and wherein further fusible means is provided in at least one of said two conductors said further fusible means being provided to have a current carrying capacity greater than that of the fusible strip between the wall anode and the conductor in which the further fusible means is provided.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Surgical Instruments (AREA)
  • Secondary Cells (AREA)
  • Indicating Or Recording The Presence, Absence, Or Direction Of Movement (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US00325458A 1972-02-17 1973-01-22 Camera tube convertible from integral mesh to separate mesh type Expired - Lifetime US3813572A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB735372*[A GB1358475A (en) 1972-02-17 1972-02-17 Camera tubes

Publications (1)

Publication Number Publication Date
US3813572A true US3813572A (en) 1974-05-28

Family

ID=9831500

Family Applications (1)

Application Number Title Priority Date Filing Date
US00325458A Expired - Lifetime US3813572A (en) 1972-02-17 1973-01-22 Camera tube convertible from integral mesh to separate mesh type

Country Status (6)

Country Link
US (1) US3813572A (ja)
JP (1) JPS4895722A (ja)
CA (1) CA952959A (ja)
FR (1) FR2172410B1 (ja)
GB (1) GB1358475A (ja)
NL (1) NL7301844A (ja)

Also Published As

Publication number Publication date
JPS4895722A (ja) 1973-12-07
FR2172410B1 (ja) 1976-05-14
CA952959A (en) 1974-08-13
FR2172410A1 (ja) 1973-09-28
DE2305930A1 (de) 1973-09-06
NL7301844A (ja) 1973-08-21
GB1358475A (en) 1974-07-03
DE2305930B2 (de) 1975-08-07

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