US3461336A - Television and like camera cathode ray tubes with damped target structures - Google Patents

Television and like camera cathode ray tubes with damped target structures Download PDF

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Publication number
US3461336A
US3461336A US609510A US3461336DA US3461336A US 3461336 A US3461336 A US 3461336A US 609510 A US609510 A US 609510A US 3461336D A US3461336D A US 3461336DA US 3461336 A US3461336 A US 3461336A
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United States
Prior art keywords
target
platform
assembly
cathode ray
television
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
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US609510A
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English (en)
Inventor
Edwin Russell Fuller
Norman Arthur Slark
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
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English Electric Valve Co Ltd
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Filing date
Publication date
Application filed by English Electric Valve Co Ltd filed Critical English Electric Valve Co Ltd
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Publication of US3461336A publication Critical patent/US3461336A/en
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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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/026—Mounting or supporting arrangements for charge storage screens not deposited on the frontplate

Definitions

  • a camera cathode ray tube of the kind incorporating a target assembly comprising a resistive membrane closely spaced from a conductive mesh is provided with a relatively heavy supporting member to which the target assembly is attached.
  • the supporting member is in turn connected to a carrier by spring means which allow movement of the target assembly and carrier member towards and away from the carrier but which prevents movement in other directions.
  • This invention relates to television and like camera cathode ray tubes and more specifically to camera tubes, such as the well-known image orthicon tube, of the kind in which there is provided a target electrode assembly comprising a membrane of highly resistive material, such as glass, closely spaced from a conductive mesh, the assembly being employed, in well known manner, to produce an electrical image of a subject of transmission and being scanned by a cathode ray to develop picture signals from that image.
  • a target electrode assembly comprising a membrane of highly resistive material, such as glass, closely spaced from a conductive mesh, the assembly being employed, in well known manner, to produce an electrical image of a subject of transmission and being scanned by a cathode ray to develop picture signals from that image.
  • a defect which has long been a source of trouble in camera tubes of the kind referred to is that generally termed microphony from an analogy with microphonic effects in thermionic valves. It it caused by vibration of the glass or similar membrane in relation to the mesh and/or by both of these members in relation to the support.usually a peripheral ring structure, which carries them. It usually manifests itself by the presence, in pictures reproduced from the signals developed by the tube, of bars of light and shade extending in the scanning line direction and which generally move up .ordown in the field direction. They may persist for indefinite periods of time'and may be stimulated by applied mechanical shock, or incident sound from external sources. Sometimes they occur apparently spontaneously without observable external cause.
  • FIGURES l, 2 and 3 illustrate typical known target assembly practice in image orthicon tubes and are provided for purposes of explanation and FIGURES 4 to 11 inclusive illustrate the present invention.
  • FIGURES 4 to 11 inclusive illustrate the present invention.
  • Like references denote like parts throughout.
  • FIGURE 1 is a face view of a typical known target assembly
  • FIGURE 2 is an exploded view, taken at right angles to FIGURE 1, showing the separated parts of the assembly of FIGURE 1
  • FIGURE 3 shows the assembly of FIGURE 1 mounted in known manner on a so-called target cup by which it is carried.
  • the target assembly therein shown consists of a mesh 1 of copper or other conducting material which is spaced by means of a metal or insulated spacer 3 from a membrane 2 of glass or other siutable highly sensitive material.
  • Each of the parts 1 and 2 is mounted in a surrounding mounting ring 1A or 2A as shown, and the spacer 3 is positioned between these rings so as to give the required spacing.
  • the parts 1, 2 and 3 are held together by means of a carrier ring 4 having ears or lugs 4A which are bent round and over the ring 2A carrying the membrane 2 as best shown in FIGURE 3.
  • the structure consisting of the assembled parts 1, 2, 3 and 4 is mounted in an electrode 5, known as a target cup.
  • the said structure is usually directly mounted on the target cup 5 by rigid means such as screws 5A as shown in FIGURE 3 though sometimes soft cushions are interposed between the said assembly and the said target cup in order to achieve a semi-rigid mounting of the former on the latter while preventing relative movement between them.
  • the target assembly of a camera tube of the kind referred to is mounted on a member which is in turn carried from a carrier therefor by spring means permitting movement of the structure comprising said assembly and said member directly towards and away from said carrier member but substantially preventing relative movement in other directions,
  • the aforesaid carrier will be the usually provided target cup.
  • the aforesaid member is preferably an inertia member constituted by a platform member which is heavy in relation to the target assembly proper.
  • the target assembly may be directly and rigidly mounted on the said member.
  • cushioning means may be interposed between the target assembly and the aforesaid member so as to provide a semi-rigid mounting of the former on the latter.
  • the target assembly is mounted on an inertia member constituted by an annular platform which is carried from the target assembly carrier by means of a plurality of strip springs equi-distantly spaced round said annular platform and attached each at its opposite ends to said platform and to said carrier, the springs being radially arranged and extending between the platform and the carrier.
  • Vibration damping means may be provided between the platform and the carrier.
  • damping means may be constituted by, for example, looped lengths of woven metal braid or of soft metal strip or the like extending between the platform and the carrier and affixed to both.
  • damping means may conveniently be interspersed with the springs.
  • FIGURES 4 to 11 illustrate two embodiments of the invention.
  • FIGURES 4 and 5 are mutually perpendicular views of an inertia platform ring 6 on which the target assembly is mounted and
  • FIGURES 6 and 7 are mutually perpendicular views of one of four strip springs by means of which the ring 6 is carried from a target cup.
  • each of the springs could be made of spring strip approximately 0.5 long, 0.1" wide and 0.01" thick bent into the shape shown in FIGURE 7.
  • the springs are welded at their outer ends to the outer part of one face of the platform ring 6, the said springs being spaced circumferentially at 90, extending radially inwards with respect to the platform ring and inclining upwards away from it as best shown in FIGURE 9 which is a face view of the platform ring showing the face to which the springs are attached.
  • the platform ring 6 is heavy in relation to the target assembly and may be made, for example, of nickel chromium alloy.
  • the target assembly proper Bolted to the platform ring 6 and on the side thereof away from the spring 7 is the target assembly proper which is shown in FIGURE 8 as an assembly as illustrated in FIGURES 1, 2 and 3.
  • the inner ends of the springs 7 are welded to the target cup 5 so that the inertia platform ring 6, with the target assembly mounted thereon, is carried from the target cup 5 by the said spring 7.
  • the springs allow movements of the platform ring 6, with the target assembly mounted thereon, directly towards and away from the target cup i.e. allow movements in the axial direction -but do not allow relative movements in any other direction, e.g. tangentially.
  • FIGURE 8 the target assembly proper is shown directly mounted by means of bolts on the platform ring 6 so that the mounting of the former on the latter is rigid. If desired, however, cushioning (not shown) may be provided between said assembly and said platform ring to provide a semi-rigid mounting.
  • FIGURES and 11 show, similarly to FIGURES 8 and 9 respectively a modification in which damping is provided between the inertia platform ring 6 and the target cup 5.
  • the damping is provided by vibration damping elements 8 each midway, circumferentially, between two of the spring 7 and each attached at its ends to the target cup and to the platform ring.
  • the damping elements may take any of a variety of forms, e.g. they may be looped lengths of soft metal strip but are shown in FIGURES 10 and 11 as consisting of looped lengths of woven stainless steel braid. They serve to absorb relative vibration between the platform ring 6 and the target cup 5.
  • the target assembly proper is not shown, only the platform ring 6 to which it is attached being shown. It may, however, be attached to said platform ring either in a rigid manner or in a semi-rigid manner as already described with reference to FIGURE 9.
  • the target assembly is described as, and in FIGURE 8 as illustrated is, a known assembly as shown in FIGURES 1 to 3 and without vibration damping means embodied in its construction. It is preferred, however, to provide damping means in the structure of the target assembly itself, which damping means may be of any desired and suitable form. Since the particular form employed, however, does not form part of the present invention no damping means for incorporation in the target assembly itself has been shown or described.
  • a target electrode assembly for producing an electrical image of a subject of transmission and for being scanned by a cathode ray to develop picture signals from the image and including a target electrode assembly comprising a membrane of highly resistive material closely spaced from a conductive mesh
  • the combination comprising an inertia platform member mounting said target assembly, a further member, fixed in relation to the remainder of the tube, carrying said platform member, and resilient means, including a plurality of strip spring members, interconnecting said platform member and further member for permitting movement of the inertia platform member directly toward and away from said further member in a direction normal to the lateral extent of the platform member and for substantially preventing relative movement in other directions, said plurality of strip spring elements resiliently supporting said platform member and entire target assembly upon said further member.
  • vibration damping means are constituted by looped lengths of inherently friction damping material extending between the platform and the carrier and affixed to both.

Landscapes

  • Vibration Prevention Devices (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
US609510A 1966-01-19 1967-01-16 Television and like camera cathode ray tubes with damped target structures Expired - Lifetime US3461336A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2567/66A GB1152047A (en) 1966-01-19 1966-01-19 Improvements in or relating to Television and like Camera Cathode Ray Tubes

Publications (1)

Publication Number Publication Date
US3461336A true US3461336A (en) 1969-08-12

Family

ID=9741853

Family Applications (1)

Application Number Title Priority Date Filing Date
US609510A Expired - Lifetime US3461336A (en) 1966-01-19 1967-01-16 Television and like camera cathode ray tubes with damped target structures

Country Status (6)

Country Link
US (1) US3461336A (fr)
CH (1) CH454282A (fr)
DE (1) DE1537079B1 (fr)
GB (1) GB1152047A (fr)
NL (1) NL6700657A (fr)
SE (1) SE326464B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169986A (en) * 1976-08-16 1979-10-02 U.S. Philips Corporation Television camera tube having resilient gauze supporting structure
US4323814A (en) * 1980-05-16 1982-04-06 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2149455A (en) * 1934-10-24 1939-03-07 Emi Ltd Television transmitting apparatus
US2661437A (en) * 1951-06-19 1953-12-01 Nat Union Radio Corp Dark trace cathode-ray tube
CA635963A (en) * 1962-02-06 English Electric Valve Company Limited Cathode ray tubes
US3032859A (en) * 1958-05-23 1962-05-08 Gen Electric Methods of manufacturing and handling target electrodes and target electrode assemblies
US3035197A (en) * 1958-11-21 1962-05-15 English Electric Valve Co Ltd Television camera tubes
US3137803A (en) * 1961-09-22 1964-06-16 Gen Electric Vibration isolating electrode mount
US3259774A (en) * 1964-06-12 1966-07-05 Gen Electric Target vibration isolation mount
US3309552A (en) * 1962-05-04 1967-03-14 Emi Ltd Non-magnetic metal mounting frame for pick-up tube targets for preventing microphony

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA635963A (en) * 1962-02-06 English Electric Valve Company Limited Cathode ray tubes
US2149455A (en) * 1934-10-24 1939-03-07 Emi Ltd Television transmitting apparatus
US2661437A (en) * 1951-06-19 1953-12-01 Nat Union Radio Corp Dark trace cathode-ray tube
US3032859A (en) * 1958-05-23 1962-05-08 Gen Electric Methods of manufacturing and handling target electrodes and target electrode assemblies
US3035197A (en) * 1958-11-21 1962-05-15 English Electric Valve Co Ltd Television camera tubes
US3137803A (en) * 1961-09-22 1964-06-16 Gen Electric Vibration isolating electrode mount
US3309552A (en) * 1962-05-04 1967-03-14 Emi Ltd Non-magnetic metal mounting frame for pick-up tube targets for preventing microphony
US3259774A (en) * 1964-06-12 1966-07-05 Gen Electric Target vibration isolation mount

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4169986A (en) * 1976-08-16 1979-10-02 U.S. Philips Corporation Television camera tube having resilient gauze supporting structure
US4323814A (en) * 1980-05-16 1982-04-06 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube

Also Published As

Publication number Publication date
SE326464B (fr) 1970-07-27
CH454282A (fr) 1968-04-15
NL6700657A (fr) 1967-07-20
DE1537079B1 (de) 1970-06-11
GB1152047A (en) 1969-05-14

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