US3860851A - Gauze electrode for a cathode-ray tube - Google Patents

Gauze electrode for a cathode-ray tube Download PDF

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Publication number
US3860851A
US3860851A US404340A US40434073A US3860851A US 3860851 A US3860851 A US 3860851A US 404340 A US404340 A US 404340A US 40434073 A US40434073 A US 40434073A US 3860851 A US3860851 A US 3860851A
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US
United States
Prior art keywords
gauze
electrode
aperture
gauze electrode
cathode
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
US404340A
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English (en)
Inventor
Willem Antonius Maria Hamersma
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.)
US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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Publication of US3860851A publication Critical patent/US3860851A/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
    • H01J29/025—Mounting or supporting arrangements for grids
    • 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
    • H01J29/08—Electrodes intimately associated with a screen on or from which an image or pattern is formed, picked-up, converted or stored, e.g. backing-plates for storage tubes or collecting secondary electrons

Definitions

  • the invention relates to a gauze electrode for a cathode ray tube, which electrode is arranged at a small distance parallel to a signal plate and which is supported at the edge by at least one supporting ring, measures being taken to reduce microphony" interferences which may occur as a result of vibrations of the gauze electrode.
  • the invention relates in particular to a gauze electrode for a camera tube of the vidicon type.
  • the inner edge of at least one supporting ring of the gauze electrode encloses an aperture which mainly is in the form of a rectangle of which at least two oppositely located sides are curved, the wires of the gauze extending mainly according to the diagonals of the rectangular aperture.
  • the corners of the rectangle are preferably rounded off, so as to be able to better use the surface of the gauze.
  • the curved sides of the aperture preferably extend convex relative to the centre of the aperture. Preferably, all four sides are shaped in this bent manner.
  • the radius of the curved sides is preferably approximately equal to the radius of the outer edge of the supporting ring.
  • a damping member of thin aluminum foil is known from the U.S. Pat. No. 3,287,585 which is provided as a spacing member between gauze and signal plate. It is stated that the aperture of said foil may be irregular and that finger-shaped projections may be present, if desired. However, such projections can only be used if the material thereof consists of a thin foil since otherwise they damage the gauze.
  • FIG. 1 is a longitudinal sectional view of a vidicon tube
  • FIG. 2 shows an embodiment of a supporting ring for a tube with rectangular picture scanning
  • FIG. 3 shows an embodiment of a supporting ring suitable for scanning both a rectangular and a circular disk-shaped picture
  • FIG. 4 is a part of a cross-sectional view of a gauze electrode according to the invention.
  • Reference numeral 1 in FIG. 1 denotes the wall of a vidicon camera tube which is closed by a glass plate 2.
  • a photosensitive signal electrode 3 is present on the inside of the plate 2.
  • the gauze electrode 4 is provided parallel to the electrode 3 and at a few millimeters dis tance therefrom.
  • the gauze 4 consists, for example, of wires of nickel or copper having a thickness of 4 p. and a center distance of 36 t. Instead of wires, the gauze electrode 4 may also be a perforated plate.
  • the gauze 4 is clamped between two supporting rings 5 and 7 which are secured together by means of a numher of spot welds along the circumference or by solder ing or diffusion.
  • the material of the ring 5 has a thickness of, for example, 0.5 mm
  • the material of the ring 7 is, for example, 0.1 mm thick.
  • the rings 5 and 7 consist of molybdenum when nickel gauze is used and of a chromium-nickel alloy when copper gauze is used.
  • an electron lens 6 is provided in the tube.
  • the supporting ring 7 shown in FIG. 2 comprises a mainly rectangular aperture the sides 8 and 9 of which are convex relative to the center of the aperture.
  • the corners are rounded so as to obtain a better use of the gauze surface.
  • the sides 9 are longer than the sides 8 so that this electrode is mainly suitable for scanning an elongate rectangular picture surface.
  • all sides 8 of the aperture are the same so that this electrode is suitable both for scanning circular disk-shaped pictures and for scanning rectangular pictures.
  • the wires of the gauze 4 extend approximately according to the diagonals of the mainly rectangular aperture.
  • the holes are provided in rows which extend approximately in the direction of the diagonals of the mainly rectangular aperture of the ring.
  • the parts of the sides 8 and 9 projecting inwardly may be bent out of the plane of the ring so that they slightly press on the gauze 4 and thus intensify the damping effect. It has been found that the damping of a ring formed according to the invention is approximately 20 times more effective than in the case in which a ring 7 is used having a rectangular hole with straight sides.
  • a rectangle may be used having two straight and two oppositely located curved sides, or the corners may not be rounded off, in which case a cushion-shaped aperture is formedv
  • the use of an aperture having more than 4 sides is more unfavourable according as the number of sides increases, since the circumference of the aperture increasingly approaches the circle, which is unfavourable with respect to the occurrence of vibrations.
  • the invention is also of importance for other cathode-ray tubes, for example, oscillograph tubes, and the like.
  • a cathode-ray tube having a target electrode at one end of an envelope and a gauze electrode spaced from said target electrode, the improvement comprising at least one annular member spaced from said target for supporting said gauze electrode with reduced microphonic interference, said annular member having an inner edge enclosing a substantially rectangular aperture having at least two oppositely located curved sides, said gauze electrode comprising wires extending substantially parallel to the diagonals of said rectangular apertures.

Landscapes

  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US404340A 1972-10-27 1973-10-09 Gauze electrode for a cathode-ray tube Expired - Lifetime US3860851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7214547A NL7214547A (xx) 1972-10-27 1972-10-27

Publications (1)

Publication Number Publication Date
US3860851A true US3860851A (en) 1975-01-14

Family

ID=19817243

Family Applications (1)

Application Number Title Priority Date Filing Date
US404340A Expired - Lifetime US3860851A (en) 1972-10-27 1973-10-09 Gauze electrode for a cathode-ray tube

Country Status (9)

Country Link
US (1) US3860851A (xx)
JP (2) JPS4977528A (xx)
AR (1) AR195746A1 (xx)
CA (1) CA991241A (xx)
DE (1) DE2350727C3 (xx)
FR (1) FR2204881B1 (xx)
GB (1) GB1424250A (xx)
IT (1) IT996882B (xx)
NL (1) NL7214547A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323814A (en) * 1980-05-16 1982-04-06 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube
US4347459A (en) * 1980-10-31 1982-08-31 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube
US4678962A (en) * 1984-11-07 1987-07-07 Sony Corporation Image pickup tube

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5616759Y2 (xx) * 1975-11-18 1981-04-18
JPS61110943A (ja) * 1984-11-06 1986-05-29 Matsushita Electronics Corp 撮像管

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287585A (en) * 1963-03-15 1966-11-22 Westinghouse Electric Corp Target electrode assembly for an electron discharge device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL245593A (xx) * 1958-11-21
GB1014376A (en) * 1963-11-13 1965-12-22 English Electric Valve Co Ltd Improvements in or relating to television and like camera cathode ray tubes
FR1526976A (fr) * 1966-01-19 1968-05-31 English Electric Valve Co Ltd Tubes à rayons cathodiques pour caméras de télévision et analogues

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3287585A (en) * 1963-03-15 1966-11-22 Westinghouse Electric Corp Target electrode assembly for an electron discharge device

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4323814A (en) * 1980-05-16 1982-04-06 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube
US4347459A (en) * 1980-10-31 1982-08-31 Rca Corporation Mesh assembly having reduced microphonics for a pick-up tube
US4678962A (en) * 1984-11-07 1987-07-07 Sony Corporation Image pickup tube

Also Published As

Publication number Publication date
JPS5331928U (xx) 1978-03-18
NL7214547A (xx) 1974-05-01
FR2204881A1 (xx) 1974-05-24
AR195746A1 (es) 1973-10-31
DE2350727B2 (de) 1978-06-08
JPS5326901Y2 (xx) 1978-07-08
DE2350727C3 (de) 1979-02-08
AU6180173A (en) 1975-05-01
IT996882B (it) 1975-12-10
JPS4977528A (xx) 1974-07-26
FR2204881B1 (xx) 1979-04-13
GB1424250A (en) 1976-02-11
CA991241A (en) 1976-06-15
DE2350727A1 (de) 1974-05-02

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