EP0353058A1 - Entladetastfläche für Videobildschirm - Google Patents

Entladetastfläche für Videobildschirm Download PDF

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Publication number
EP0353058A1
EP0353058A1 EP89307621A EP89307621A EP0353058A1 EP 0353058 A1 EP0353058 A1 EP 0353058A1 EP 89307621 A EP89307621 A EP 89307621A EP 89307621 A EP89307621 A EP 89307621A EP 0353058 A1 EP0353058 A1 EP 0353058A1
Authority
EP
European Patent Office
Prior art keywords
user
filter screen
frame
conductive
indicator light
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.)
Withdrawn
Application number
EP89307621A
Other languages
English (en)
French (fr)
Inventor
Mark Gart
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.)
SUN-FLEX Co Inc
SUN FLEX CO Inc
Original Assignee
SUN-FLEX Co Inc
SUN FLEX CO Inc
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 SUN-FLEX Co Inc, SUN FLEX CO Inc filed Critical SUN-FLEX Co Inc
Publication of EP0353058A1 publication Critical patent/EP0353058A1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
    • H05F3/00—Carrying-off electrostatic charges
    • H05F3/02—Carrying-off electrostatic charges by means of earthing connections
    • 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
    • H01J29/868—Screens covering the input or output face of the vessel, e.g. transparent anti-static coatings, X-ray absorbing layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/863—Passive shielding means associated with the vessel
    • H01J2229/8633—Meshes and patterns

Definitions

  • This invention relates to a device that may be added to or near the face of a display surface of a video display terminal for the purpose of discharging static electrical energy existing on or generated by a user of the terminal.
  • Video display terminals are now commonplace as a result of the rapid increase in the use of computers and the like.
  • the usual display surface of such a terminal is a cathode ray tube.
  • Electromagnetic energy is generated from within the terminal from the electrical components therein and from the beam of the cathode ray tube, which produces electrostatic and electromagnetic fields emanating from the terminal.
  • the user of the terminal also frequently generates static electric energy from the materials surrounding the terminal and from the user's clothing and movement. These electromagnetic and static electric energies need to be withdrawn or conducted from the terminal for reasons that include operator comfort, reduction in possible loss of memory within the storage of the terminal, and/or damage to the electronics within the terminal.
  • Filter screens are known which may be positioned over the face of the video display terminal for the purpose of suppressing or reducing the electromagnetic and/or elec­trostatic fields emanating from the terminal.
  • the screens are electrically connected to the ground system of the terminal so that such fields are shunted to terminal ground at the filter screen.
  • the screen is capable of collecting any static electricity generated at the terminal and conducting that energy to terminal ground.
  • the cabinet enclosing the terminal and the keys of the terminal keyboard are not usually grounded to the electrical ground of the terminal even though they are isolated from the supply service electrical ground to protect the user of the terminal from electrical shock.
  • the static electrical energy generated by the user of the terminal is not grounded to the terminal ground with the mere use of the terminal keyboard or controls.
  • the present invention is directed to apparatus for discharging electrical charge, sometimes referred to as personal static, accumulated on a user of a video display terminal of the type having a cathode ray tube (CRT) for generating the video display and a conductive mesh filter screen mounted over the display surface of the CRT and grounded to the display terminal for reducing or suppressing electric fields emanating from the terminal.
  • CTR cathode ray tube
  • the invention provides an electrically conducting contact surface at a convenient location which is electrically connected for discharge to ground through the conducting mesh filter screen. When the user touches the contact surface, any accumulated personal static is safely discharged through the mesh filter.
  • the apparatus may be secured to the frame of the filter screen at a convenient location so as to make electrical contact with the mesh filter and to present a convenient contact surface to the user.
  • an indicator light responsive to the discharging personal static is electrically interposed in the discharge path between the contact surface and the mesh filter to assure the user that the personal static has been removed.
  • the attachment may be fixed to the grounded filter screen associated with the face of a video display terminal in an easily accessible and visible location on the terminal.
  • the attachment may be clamped on the frame of a grounded filter screen with the attachment being formed of conductive material that will make electrical contact with either or both of the screen material of the filter screen and the frame of the screen.
  • a video display terminal with keyboard is illustrated in the form that is typical of a computer terminal device 12.
  • the terminal includes a cathode ray tube display device 10 having a display surface 18; the cathode ray tube 10 is supported within the case 13 of the device 12 behind a bezel 15.
  • cathode ray tube and "video display terminal” will be used to encompass the cathode ray tube itself, the associated circuitry necessary to drive the electron beam or beams utilized in the cathode ray tube for display of intelligence on the screen surface, and further will include the grounding chassis which may or may not include the housing of the terminal or a like device.
  • cathode ray tube would encompass what is currently sold in the marketplace as a television set, a remote display device, a video display tube and associated circuitry used in a word processor, or any other installation where a cathode ray tube is utilized for electronic display of information on the surface of the tube itself.
  • a radiation and static electricity suppression device is shown in the form of a filter screen 17, which includes a conductive mesh fabric screen 14, or similarly functioning material, and a frame 16.
  • Mesh screen 14 may be held in frame 16 such that the screen 14 may be conformably positioned against the display surface 18 of the cathode ray tube or, alternatively, mounted on the front of the terminal 12 between the user and the surface 18.
  • Such a conformably mounted framed mesh screen for reducing glare as well as radiation and static electricity is disclosed in U.S. Patent No. 4,468,702 issued to Louis H.M. Jandrell on August 28, 1984.
  • a filter screen wherein a conductive mesh fabric coated with conductive plastics or the like is electrically connected through a grounding wire 26 to ground of the terminal.
  • the mesh fabric 14 of the filter screen is glued by a conductive glue at 24 to the frame 16 of the filter screen and to the grounding wire 26 at 28.
  • the filter screen of the device shown in U.S. Patent No. 4,468,702 is effective in the suppression of certain radiation and static electricity generated within the terminal.
  • the screen does not reduce the effects of static electricity generated by the user of the device or by other sources external to the terminal. That static electricity could cause operator discomfort by discharge "shock" to the terminal or could possibly cause loss of storage memory within the terminal and might distort the display on the surface of the terminal. It is the purpose of the present invention to provide a means for discharging that static electricity easily, conveniently, comfortably and safely.
  • a touchplate device is adapted to be attached to the frame of the filter screen in a manner to provide an electrical connection between the touchplate and the mesh of the filter screen. As shown in FIGS. 2 and 3, a touchplate 40 is attached to the frame 16 of the filter screen in a location where a portion of the touchplate is in contact with the mesh 14 of the screen.
  • FIGS. 4 and 5 illustrate the touchplate 40 in elevation and cross section.
  • the touchplate member 40 is formed of a conductive material in a channel or U-shape with a body portion 42 and legs 44 and 46.
  • the interior portions of the legs 42 and 46 are formed with shoulder extensions 48 directed toward each other so that the touchplate has an interior portion 50 that is wider than the space between the extensions 48.
  • the touchplate has a linear dimension that is substantially larger than its lateral dimension; however, the linear dimension can be any desired length to serve the purpose intended.
  • the touchplate 40 is formed of a flexible material that will permit the legs 44 and 46 to pivot about their connection to the body portion 42. Those skilled in the plastics arts will readily be able to select from a variety of plastic compositions which may be used for this purpose.
  • the extensions 48 are formed in a form to permit a frame to be easily passed toward the interior 50 but to restrict the retraction of the frame from the interior. Further, the extensions are formed with sloping surfaces on their interiors to be effective in pressing the frame firmly into the interior 50.
  • the entire touchplate is conductive so that the exterior ends of the legs 44 or 46 will make good electrical contact with the mesh 14 of the filter screen.
  • the touchplate 40 is designed to enclose a portion of the frame 16 of a filter screen as shown in FIGS. 2 and 3, and in more detail in FIG. 6, in a manner to enclose the frame within the interior portion 50 between the legs 44 and 46 and with the extensions 48 retaining the frame within the interior.
  • the ends of the legs 44 or 46 make their contact with the mesh 14 and present the exterior of the body portion at the exterior of the frame 16.
  • the touchplate 40 is mounted on a filter screen frame 16 behind the bezel 15.
  • the user of the terminal merely touches the touchplate 40 with the first use of the terminal or at any time during the use of the terminal. That touch permits any static electricity existing on the user to be discharged through the touchplate to the ground circuit of the terminal through the filter screen. If the user generates static electricity during use of the terminal as by moving on the flooring surface, by movement of the clothing of the user or by contact with another source of static electricity, that static electricity can be discharged to the terminal ground by merely again touching the touchplate.
  • the touchplate of the present invention can be attached to any form of conductive filter screen whether the screen is in front of the display surface or in contact with the display surface.
  • the present invention is particularly effective where the filter screen is not removable from the face of the display terminal. If the user were to repeatedly touch the filter screen for the purpose of discharging static electricity, the screen could become soiled to the degree that it would interfere with the viewing of the display. With the use of the touchplate of the present invention, only the touchplate is soiled and it is removable from the frame to permit cleaning.
  • FIGS. 7 and 8 illustrate an alternative form of operation for the touchplate of the present invention.
  • the touchplate 40 is mounted remotely from the frame or the filter screen and is connected by a conductor or pair of conductors to the screen 14 at the display surface.
  • the screen is behind the bezel 15 and the conductor is connected by suitable conducting connection to the screen at the face of the display surface.
  • the screen is at the exterior of the bezel 15 and the conductor is attached to the screen 14 or could be attached to a frame if the screen has a frame.
  • the touchplate is touched to discharge the static electricity from the user.
  • FIG. 9 illustrates an alternative form of access to the touchplate 40 when the screen 14 and its frame 16 are mounted behind the bezel 15 and not accessible from the front of the terminal.
  • the touchplate 40 is fixed to the frame as in Fig. 6 and the bezel 15 is provided with an access hole 62 through which contact may be made with the touchplate 40.
  • the touchplate is contacted through the access hole 62 to discharge static electricity from the user.
  • the apparatus may include an indicator light.
  • An embodiment of such apparatus in a front-mount filter screen is illustrated in Fig. 10.
  • the front-mount filter 70 includes the conductive mesh fabric 72 and supporting frame 74. Disposed within the frame is a conductive member 76, which presents a contact surface 78, which the user may touch to allow any personal static to discharge.
  • the conductive member 76 may be formed, for example, of a carbon-filled conductive nylon, although those skilled in the art will recognize that other conductive materials may also be used for this purpose.
  • the conductive member 76 is formed with a display window 80, through which an indicator light 84 may be viewed.
  • the conductive mesh fabric 72 may be connected to the terminal ground by grounding cable 84.
  • a cavity is formed, in which the indicator light 82 is mounted.
  • a top wall 86 of the cavity is provided by a portion of the conductive member 78.
  • a bottom wall of the cavity 88 is provided by the back portion of the filter screen frame 74.
  • the conductive mesh filter screen is indicated at reference numeral 90.
  • the conductive top wall 86 of the cavity makes electrical contact with the metallic contact member 92, which in turn makes electrical contact with a lead 94 at a first side of the indicator light 84.
  • Electrical connection is made with the conductive mesh filter screen 90 through a metallic plate 96 overlying the mesh filter screen 90.
  • the lead 98 at a second side of the indicator light 82 lies in contact with the plate 96.
  • the plate 96 in effect provides electrical contact with the mesh over a small area rather than at a point.
  • the indicator light 82 be of such characteristics that it will respond to the discharge of the relatively low levels of personal static typically accumulated by a user.
  • a Gilway neon bulb, Model No. N501, having an ionization potential of 85 volts has been found sufficient for this purpose. With this or lower threshold potential for energizing the bulb, the operation of the bulb as an indicator of static discharge has been found to be independent of prevailing atmospheric conditions.
  • the indicator light is interposed in the discharge path between the conductive member 76 and the conductive mesh filter screen 90. Discharging the accumulated charge through the conductive mesh in this manner, the mesh may perform the function of a current limiting fuse in the event of an electrical problem in the CRT or grounding system.

Landscapes

  • Elimination Of Static Electricity (AREA)
  • Electrotherapy Devices (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
EP89307621A 1988-07-28 1989-07-27 Entladetastfläche für Videobildschirm Withdrawn EP0353058A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US22545988A 1988-07-28 1988-07-28
US225459 1988-07-28
US27257588A 1988-11-17 1988-11-17
US272575 1988-11-17

Publications (1)

Publication Number Publication Date
EP0353058A1 true EP0353058A1 (de) 1990-01-31

Family

ID=26919621

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89307621A Withdrawn EP0353058A1 (de) 1988-07-28 1989-07-27 Entladetastfläche für Videobildschirm

Country Status (5)

Country Link
EP (1) EP0353058A1 (de)
JP (1) JPH02167179A (de)
AU (1) AU3806089A (de)
DK (1) DK366189A (de)
NO (1) NO893031L (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615271A1 (de) * 1993-03-08 1994-09-14 Optical Coating Laboratory, Inc. Vorrichtung zur Entladung von elektrostatischer Energie
EP0617485A2 (de) * 1993-03-23 1994-09-28 Optical Coating Laboratory, Inc. Internationaler elektrischer geerdeter Steckverbinder/Adapter für Computermonitor
EP0639040A1 (de) * 1993-08-11 1995-02-15 Kevin L Cooter System zur Entladung statischer Elektrizität und Verfahren dafür

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586106A (en) * 1984-08-24 1986-04-29 Frazier Thomas G Static dissipative touch device
US4745518A (en) * 1987-04-01 1988-05-17 Fang Kuo C Monitor filter with static eliminating means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4586106A (en) * 1984-08-24 1986-04-29 Frazier Thomas G Static dissipative touch device
US4745518A (en) * 1987-04-01 1988-05-17 Fang Kuo C Monitor filter with static eliminating means

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0615271A1 (de) * 1993-03-08 1994-09-14 Optical Coating Laboratory, Inc. Vorrichtung zur Entladung von elektrostatischer Energie
EP0617485A2 (de) * 1993-03-23 1994-09-28 Optical Coating Laboratory, Inc. Internationaler elektrischer geerdeter Steckverbinder/Adapter für Computermonitor
EP0617485A3 (de) * 1993-03-23 1996-03-27 Optical Coating Laboratory Inc Internationaler elektrischer geerdeter Steckverbinder/Adapter für Computermonitor.
EP0639040A1 (de) * 1993-08-11 1995-02-15 Kevin L Cooter System zur Entladung statischer Elektrizität und Verfahren dafür
AU671033B2 (en) * 1993-08-11 1996-08-08 Kevin L. Cooter Static electricity dissipation system for computers

Also Published As

Publication number Publication date
DK366189D0 (da) 1989-07-25
DK366189A (da) 1990-01-29
JPH0412993B2 (de) 1992-03-06
NO893031D0 (no) 1989-07-25
NO893031L (no) 1990-01-29
AU3806089A (en) 1990-02-01
JPH02167179A (ja) 1990-06-27

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