WO1989003631A1 - Ecran de tube cathodique muni d'une maille a double revetement - Google Patents

Ecran de tube cathodique muni d'une maille a double revetement Download PDF

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Publication number
WO1989003631A1
WO1989003631A1 PCT/US1988/003481 US8803481W WO8903631A1 WO 1989003631 A1 WO1989003631 A1 WO 1989003631A1 US 8803481 W US8803481 W US 8803481W WO 8903631 A1 WO8903631 A1 WO 8903631A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
screen according
electrically conductive
face
outer layer
Prior art date
Application number
PCT/US1988/003481
Other languages
English (en)
Inventor
Michael L. Hiles
Roger Peterson
Donald Firth
Original Assignee
Norad Corporation
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 Norad Corporation filed Critical Norad Corporation
Publication of WO1989003631A1 publication Critical patent/WO1989003631A1/fr

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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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/867—Means associated with the outside of the vessel for shielding, e.g. magnetic shields
    • 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
    • H01J29/86—Vessels; Containers; Vacuum locks
    • H01J29/89—Optical or photographic arrangements structurally combined or co-operating with the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8901—Fixing of optical components to the vessel
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/89—Optical components associated with the vessel
    • H01J2229/8913—Anti-reflection, anti-glare, viewing angle and contrast improving treatments or devices
    • H01J2229/8922—Apparatus attached to vessel and not integral therewith

Definitions

  • the present invention relates to a CRT shield and particularly to a shield which combines anti-glare, anti-static and anti-radiation properties.
  • a cathode ray tube particularly as used as a video display terminal unit or terminal ("VDU” or “VDT") for computer applications, frequently has a shiny front display surface, which reflects incident light and glare, and a relatively light-colored display surround, resulting in low contrast between the lighted elements of the display and the surround. These characteristics contribute to fatigue, error and low productivity on the part of users of the VDT.
  • a cathode ray tube is capable of producing an electrostatic field at its face and extending for some distance in front of its face, which attracts dust to the face of the cathode ray tube, and has been implicated by some medical re ⁇ searchers as a cause of dermatitis and other adverse skin conditions.
  • a cathode ray tube is capable of producing electromagnetic emanations or radiation. This radiation is suspected by some medical researchers of causing adverse health effects on users. The radiation may also be received and decoded at a distance to reproduce the information displayed on the screen of the cathode ray tube.
  • Various prior art discloses techniques for reducing glare and reflection, such as U.S. Pat. No. 4,253,737 granted on March 3, 1981, to Erik J. Thomsen, et al., comprising a micro- weave screen of black filaments mounted in a flexible mount.
  • a screen for a video display terminal comprising a mesh consisting of a plurality of monofila ent strands having a diameter of not more than 60 microns, which strands are woven into a mesh having a strand count of not less than 200 threads to the linear inch, and which are uniform in the vertical and horizon ⁇ tal directions, which strands are coated with a plura ⁇ lity of metallic coatings of which at least one is highly conductive of electricity and of which the final one is black in color and is deposited in a crystalline state such that its surface exhibits microscopic roughness and acts to diffuse and scatter incident light, which mesh is contained in a frame or other retaining means which keeps it taut, which frame or other retaining means provides a means of attachment to the case of the video display terminal such that the screen is situated in front of and not more than one and one-half inches from the face of the cathode ray tube, and which frame also comprises a means for electrically connecting the
  • FIG. 1 is a front elevational view of a video display terminal utilizing the screen of the present invention
  • FIG. 2 is a sectional view taken along line 2 - 2 of FIG. 1;
  • FIG. 3 is an enlarged sectional view, similar to that shown in FIG. 2, but enlarged approximately 400 times to show the monofilament strands and the successive- sive metallic coatings thereon.
  • an anti-glare, anti-reflection, contrast- enhancing screen 10 of the present invention having anti-static and anti-radiation properties, mounted on a conventional video display terminal 12.
  • the mesh screen portion 14 of the instant inven- tion reduces the perceived glare and reflection on the face of the video display terminal.
  • glare is meant the general non-specular reflection of ambient light from the face of the cathode ray tube of the video display terminal or from any glass, plastic or other transparency installed in front of such cathode ray tube; by “reflection” is meant the specular reflection of ambient light from the same.
  • the mesh screen 14 of the present invention increases the perceived contrast of the alphanumeric or graphic display of the video display terminal in that the video display terminal in that the illuminated display elements are perceived against a perceived background comprising the black, non-reflec- tive surface of the strands 16 (see FIG. 3) comprising the mesh 14. Moreover, by reason of its construction, the mesh screen 14 of the present invention reduces and attenuates the electrostatic field at the face of the video display terminal 12 and the electromagnetic radiation or emission through the face of the cathode ray tube in such terminal 12.
  • the screen 10 basically consists of a mesh screen 14 constructed in accordance with the present invention as elsewhere described in more detail, held taut in a retaining means or frame 18.
  • retaining means or frame 18 consists of two identical frame halves 20 and 22 produced by injection molding, glued together at 24 as a sandwich with the mesh screen 14 forming the middle by means of a suitable adhesive.
  • the retaining means or frame consists of two aluminum or other metal frame halves cut or stamped from sheet metal, or produced by casting, fastened together by means of rivets, screws, or other suitable fasteners, or with a suitable adhe ⁇ sive, as a sandwich with the mesh screen forming the middle.
  • the retaining means or frame 18 is also provided with a suitable means for attaching it to the cabinet of the video display terminal 12.
  • such retaining means or frame is provided with spacers made of a foam rubber or vinyl or similar compressible substance, which are added to its edges to enable it to fit the recess provided in the cabinet of many types of video display terminal, and with paired fabric hook-and-loop fasteners, which spacers and fasteners are coated on one side with a pressure- sensitive adhesive, so that the user can easily install the screen in the manner most suitable for the particu ⁇ lar video display terminal.
  • the retaining means or frame 18 can be manufactured in various lengths and heights to enable fitting various video display terminals.
  • the retaining means or frame 18 is fitted with a means for conducting electricity from the conductive mesh to an external grounding cable and connector.
  • a means for conducting electricity from the conductive mesh to an external grounding cable and connector consists of a ferrule 24 (FIG. 1) made of a conductive metal, inserted in a hole provided for such purpose in the frame half which forms the front of the screen, which ferrule 24 makes contact with the conductive mesh screen 14, and which serves as a jack into which a suitable plug connected to a grounding cable 26 can be fitted.
  • the grounding cable 26 is permanently fastened by means of a wire terminal, rivet, screw or similar means.
  • the mesh screen is made of a plurality of strands 16 of monofilament woven so that they form a precise mesh 30 of evenly spaced strands of not fewer than 200 strands to the linear inch, each strand 16 having a diameter of not more than 60 microns.
  • Many previous mesh screens used as filters for video display terminals have been made of coarser strands or have had wider spacing, and such previous screens caused annoying moire and Newton's Ring effects, especially when used in connection with color displays or high-resolution displays.
  • the strands 16 of the present invention include a monofilament 17 which is coated with a plurality of metallic coatings such that at least one such coating is highly conductive of electricity, and the final coating is black in color and deposited in crystalline form so that its surface exhibits microscopic roughness and acts to diffuse ambient light.
  • the first metallic coating 32 (FIG. 3) is of nickel, which forms an excellent bond to the underlying mono ⁇ filament; the second coating 34 is of copper, which provides a high degree of electrical conductivity.
  • the mesh screen was made of a woven metal wire, such as stainless steel.
  • woven metal cloth has many disadvantages including the facts that it is expensive, takes a permanent set when bent, and has a shiny surface so that it does not effectively reduce glare and reflection and increase contrast. It is an object of the present invention to provide a highly conductive mesh screen with its electrical advantages while at the same time utilizing relatively inexpensive materials which can be woven with a high degree of precision and which retain their precision character in use.
  • the final coating 36 is of black chrome or black nickel, either of which deposit in a crystalline form and have the requisite properties.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)

Abstract

Ecran de tube cathodique (10) comprenant une maille monofilament tissé (14) recouverte d'une pluralité de revêtements métalliques (32, 34), dont l'un au moins est un bon conducteur électrique, et dont le dernier est un métal noir sous forme cristalline, présentant des propriétés de diffusion et d'absorption de lumière, dans un cadre (18) qui maintient la maille (14) à plat. Ce cadre (18) est pourvu d'un élément (24) qui conduit l'électricité de la maille à un organe (24) permettant de relier un câble externe de mise à la terre (26) ou un autre moyen par lequel l'énergie électrique puisse être amenée à la terre de manière appropriée.
PCT/US1988/003481 1987-10-16 1988-10-07 Ecran de tube cathodique muni d'une maille a double revetement WO1989003631A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10894987A 1987-10-16 1987-10-16
US108,949 1987-10-16

Publications (1)

Publication Number Publication Date
WO1989003631A1 true WO1989003631A1 (fr) 1989-04-20

Family

ID=22324988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1988/003481 WO1989003631A1 (fr) 1987-10-16 1988-10-07 Ecran de tube cathodique muni d'une maille a double revetement

Country Status (1)

Country Link
WO (1) WO1989003631A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032920A (en) * 1989-08-29 1991-07-16 Hewlett-Packard Company Ground strap for conductive screen on CRT
FR2670981A1 (fr) * 1990-12-19 1992-06-26 Clausse Georges Filtre composite a plus de deux surfaces utiles pour ecran de visualisation.
WO1993010537A1 (fr) * 1991-11-22 1993-05-27 Icl Systems Aktiebolag Dispositif et procede pour diminuer le champ electrique alternatif produit dans leur voisinage/par des unites de visualisation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246613A (en) * 1979-01-10 1981-01-20 Delta Data Systems Corporation Anti-glare screen with electromagnetic interference rejection
US4468702A (en) * 1982-04-16 1984-08-28 Daca International B.V. Radiation and static electricity suppression device
US4471015A (en) * 1980-07-01 1984-09-11 Bayer Aktiengesellschaft Composite material for shielding against electromagnetic radiation
US4661403A (en) * 1982-03-16 1987-04-28 American Cyanamid Company Yarns and tows comprising high strength metal coated fibers, process for their production, and articles made therefrom
US4710591A (en) * 1986-10-06 1987-12-01 Unisys Corporation EMI/RFI shielding assembly for cathode ray tube monitors

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4246613A (en) * 1979-01-10 1981-01-20 Delta Data Systems Corporation Anti-glare screen with electromagnetic interference rejection
US4471015A (en) * 1980-07-01 1984-09-11 Bayer Aktiengesellschaft Composite material for shielding against electromagnetic radiation
US4661403A (en) * 1982-03-16 1987-04-28 American Cyanamid Company Yarns and tows comprising high strength metal coated fibers, process for their production, and articles made therefrom
US4468702A (en) * 1982-04-16 1984-08-28 Daca International B.V. Radiation and static electricity suppression device
US4468702B1 (fr) * 1982-04-16 1990-04-03 Daca Int Bv
US4710591A (en) * 1986-10-06 1987-12-01 Unisys Corporation EMI/RFI shielding assembly for cathode ray tube monitors

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5032920A (en) * 1989-08-29 1991-07-16 Hewlett-Packard Company Ground strap for conductive screen on CRT
FR2670981A1 (fr) * 1990-12-19 1992-06-26 Clausse Georges Filtre composite a plus de deux surfaces utiles pour ecran de visualisation.
WO1993010537A1 (fr) * 1991-11-22 1993-05-27 Icl Systems Aktiebolag Dispositif et procede pour diminuer le champ electrique alternatif produit dans leur voisinage/par des unites de visualisation
US5614789A (en) * 1991-11-22 1997-03-25 Kristiansson; Robert Apparatus and method of reducing varying electrical fields in video display terminals

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