JPH02167179A - Apparatus and method for use on - Google Patents

Abstract

PURPOSE: To discharge static electricity from a user of a terminal device to the ground, by equipping a conductive contact face on a place to be electrically connected to discharge the charge through a conductive net filter screen. CONSTITUTION: A filter screen 17 includes a conductive net cloth screen 14, or a substance to function similarly, and a frame 16. The net cloth 14 of the filter screen is adhered to a part 24 of a frame 16 of the filter screen by a conductive adhesive and adhered to a part 28 of a grounding line 26. An electric connection is made between a contact plate 40 and a filter screen 17. When a user of a terminal device uses the terminal device at first or arbitrary time during use, static electricity stored in the user can be discharged through the contact plate and the filter screen to a grounding circuit of the terminal device by touching on the contact plate 40.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is applied to a video display terminal device for the purpose of discharging electrostatic energy that exists in a user of the video display terminal device and can cause irritation to the user. This invention relates to a device that can be attached near the face or screen of a display screen.

[Conventional technology]

As a result of the rapid increase in the use of computers and the like, video display terminals have become commonplace.

The typical display surface of the modified terminal device is a cathode ray tube.

Electromagnetic energy is generated from the terminal equipment's internal electrical components and the cathode ray tube beam.

The electromagnetic energy generates electrostatic and electromagnetic fields from the terminal device. The user of the terminal also often generates electrostatic energy from materials surrounding the terminal, the user's clothing, and the user's movements. Electromagnetic energy and electrostatic energy of 1,000,000,000, etc. can be used to provide comfort to the user of the terminal, reduce the loss of stored contents of the terminal, and protect the electronic devices inside the terminal. There is a need to remove or conduct electromagnetic and electrostatic energy from the terminal device for reasons including at least one of damage.

Filter screens are known. Video display of filter screens for suppressing or reducing electromagnetic and/or static electric fields generated by terminal devices! It can be located on the face of the terminal device.

These electromagnetic and electrostatic fields are shunted to the earth of the terminal device at the filter screen, so that the screen is electrically connected to the ground system of the terminal device. The screen can collect static electricity generated on the terminal device and direct the electrostatic energy to the terminal device's ground.

The gear vignette housing the terminal and the keys on the terminal's keyboard are normally connected to the electrical ground of the terminal.
However, the cabinet and keys must be isolated from the electrical ground source to protect the user of the terminal from damage. Electrostatic energy generated by a user of a terminal device cannot be grounded to ground on the terminal device simply by using the terminal keyboard or controls.1. do not have. Therefore, the user of the terminal device may suffer n or data loss: n, f? A need has arisen for a device that allows a primary user of a terminal device to discharge static electricity so as to reduce or eliminate the possibility of damage to the device.

[Problem to be solved by the invention]

It is an object of the present invention to provide a simple attachment to a video display terminal that allows the user of the terminal to discharge static electricity from the user to the ground of the terminal.

Another object of the present invention is to be able to be fixed to a grounded filter screen associated with the face of a bidet display terminal;
It is an object of the present invention to provide an attachment that can be easily accessed and easily seen on a terminal device.

Another object of the invention is to provide an attachment capable of being fixed to a frame of a filter screen which is grounded and formed of a conductive material in electrical contact with one or both of the screen material of the filter screen and the frame of the screen. It is still another object of the present invention to obtain a 4.degree. This means visually instructing the user what is being done.

[A precautionary measure to solve the naked problem]

The present invention provides shade 8ia, tube (CR) for video display.
(T) and a conductive mesh filter screen provided on the display surface of the CRT and grounded to the display terminal to reduce or suppress the electric field emanating from the terminal. The electric charge charged on the user (
The present invention provides a terminal device for discharging personal static charges (sometimes referred to as personal static charges). The present invention provides a conductive contact surface at a convenient location that is electrically connected for discharge to ground through a conductive mesh filter, screen, etc. 1. When a user touches the contact surface. , the static charge on the user is safely discharged through the mesh filter.

In one embodiment of the invention, the device of the invention can be secured to the frame of the filter screen at a convenient location to provide electrical contact to the mesh filter and convenient access to the user. In another embodiment of the invention, an indicator light responsive to the electrostatic charge is electrically placed in the discharge path between the contact surface and the mesh filter to completely remove the electrostatic charge from the user.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the drawings.

First, refer to FIG. In this figure, a video display terminal with a keyboard is shown in a manner typical of a computer terminal 12. The terminal device includes a cathode ray tube display 10 having a display surface 18 . The cathode ray tube 10 is supported inside the case 13 of the terminal device 2 and behind the groove 15.

For purposes of this detailed description and claims,
The terms "cathode ray tube" and "video display terminal" are used to encompass the cathode ray tube itself and the associated circuitry required to drive the electron beam utilized within the tube to display information on the screen surface. and includes a grounded chassis. This grounded chassis may or may not include any grounding such as terminal equipment.

In summary, the term cathode ray tube (CRT) refers to associated circuitry used in television sets, remote display devices, video display tubes, and word processors, or for displaying information electronically on the surface of the tube itself. This includes other devices currently on the market in which cathode ray tubes are used.

Reference is now made to FIG. 2 in which the radiation and static suppression device is shown in the form of a filter screen 1T. The filter screen includes a conductive mesh fabric screen 14, or similarly functioning material, and a frame 16. The mesh screen 14 is positioned so as to be aligned with the display surface of the CRT, and the user and the display surface 18
A mesh screen 14 can be held within the frame 16 such that it is attached to the front of the terminal 12 between the two ends. A mesh screen IJ-screen mounted in conformity to reduce glare and to reduce radiation and static electricity is disclosed in U.S. Pat. No. 4,468,702.

In that patent, a conductive mesh fabric coated with conductive plastic or the like is connected to a ground wire 26 to the ground of the terminal device. As shown in FIG. 3, the mesh fabric 14 of the filter screen is adhered to the portion 24 of the frame 16 of the filter screen with conductive adhesive, and the ground wire 2
Glue it to the part 28 of No. 6.

The filter screen of the device shown in US Pat. No. 4,468,702 is effective in suppressing certain types of radiation and static electricity generated within the terminal equipment. The screen does not reduce the effects of static electricity generated by the user of the terminal or by sources external to the terminal. Static electricity can cause discomfort to users due to the "electric shock" of discharge to the terminal device, cause the contents of the terminal device's storage device to be lost, and cause the contents of the terminal device's storage device to be lost.
The display on the terminal device may be distorted and distorted.

It is an object of the present invention to provide a means for easily, conveniently, comfortably and safely discharging static electricity.

In some video display terminals, manufacturers have placed the filter screen frame 16 in front of the groove in the face of the terminal case, or at least in the opening of the groove near the face of the CRT. Such filter screens are commonly referred to as front-mounted screens. In these positions, the frame can be approached from the front of the terminal device. The normal frame of the filter screen itself may not be conductive, but the fabric within the screen is conductive because of the coating or its construction. In accordance with the invention, a contact plate arrangement is mounted to the frame of the filter screen such that an electrical connection is made between the contact plate and the mesh of the filter screen. As shown in FIGS. 2 and 3, the contact plate 40 has a portion of the plate formed by a screen mesh 14.
Frame 1 of the filter screen where it is in contact with
Attached to 6.

4 and 5 show contact plate 40 in elevation and cross-section.

As shown, the contact plate 40 includes a body portion 42 and legs 42 .
46 in a U-shape or groove shape made of conductive material. The interior of the legs 42, 46 are formed with mutually opposed shoulder extensions 48 which tend to form an inner portion 50 which is wider than the space between the extensions 48. The vertical dimension of the contact plate is substantially larger than the horizontal dimension, but the vertical dimension can be any value desired to serve the intended purpose.

The contact plate 40 is formed of a flexible material so that the legs 44 and 46 can rotate about the connection to the body part 4z. A person skilled in the field of plastics technology can easily select from a variety of plastics that can be used for this purpose.

The extension 48 is configured to facilitate passage of the frame toward the interior 50 but to restrict extraction of the frame from the interior 13 and is also effective in forcing the frame into the interior 50. A sloped surface is formed within the extension. The legs 44 make the entire contact plate electrically conductive so that the outer ends of the legs 46 make good electrical contact with the mesh 14 of the filter screen.

The extensions 4 enclose the frame within the interior 50 of the legs 44 and 46 with the frame retained within the interior 50, as shown in FIGS. 2 and 3 and in detail in FIG. frame 1 of the filter screen as shown.
A contact plate 40 is configured to surround a part of the contact plate 6. leg 44
The ends of 4 or 46 contact the mesh 14 and represent the exterior of the body portion to the exterior of the frame 16. As shown in FIG.
6.

The user of the terminal device only needs to touch the contact plate 40 when using the terminal device for the first time or at any time during use. and the filter screen to the terminal equipment's ground circuit.The terminal equipment is designed to prevent the user from moving on the floor, rubbing against other static electricity sources, or touching another source of static electricity. If the user generates static electricity while using the terminal, the static electricity can be discharged to the terminal device's ground simply by touching the contact plate again.

It should be understood that the contact plate of the present invention can be attached to any embodiment of the contact plate, whether the conductive filter screen is provided in front of the display surface or in contact with the display surface. be. Display filter screen! The contact plate of the present invention is particularly effective in cases where the contact plate cannot be removed from the face of the contact plate. If a user were to touch the contact plate to discharge static electricity, the screen could become so dirty that it would be difficult to view the display. When using the contact plate of the present invention, only the contact plate becomes dirty.
It can be removed from Freno for cleaning.

7 and 8 show another mode of operation of the contact plate of the present invention. In those figures, contact plate 40 is mounted remotely from the frame or filter screen, and conductor 60 is mounted separately from the frame or filter screen.
The screen 14-2 is connected to a pair of conductors of the same size at the face of the rainbow display surface. In Figure 7, the screen is located behind the groove 15 and the conductor is connected to a suitable conductive connection VC.
It connects to the screen on the face of the display surface. In FIG. 8, the screen is outside the groove 15;
The conductor can be connected to the screen 14 or to the frame if the screen has a frame. In the alternative embodiment of FIGS. 7 and 8, the contact plate touches the contact plate to discharge static electricity from the user.

FIG. 9 shows that the screen 14 and its frame 16 are in groove 1.
5, which shows another way to approach the contact plate 40 when it is not possible to approach from the front of the terminal device. In this manner, the contact plate 40 is secured to the frame as shown in FIG. 6, and the groove 15 is provided with an access hole 62 for contacting the contact plate 40. @9 In the embodiment shown in Figure 9, the access hole 6 is provided to discharge static electricity from the user.
2 to contact the contact plate.

To inform the user that body static electricity has been discharged, the device of the present invention may include an indicator light. An example of such a device for front mounting in a filter screen is shown in FIG. At the front end, the filter TO includes a conductive mesh T2 and a support frame 74. A conductive member 76 is disposed inside this frame. This electrically conductive member presents a contact surface 78 . The user can touch the contact surface to discharge static electricity. The electrically conductive member may be formed of carbon-filled electrically conductive nylon, for example, although it will be appreciated that other electrically conductive members may be used for this purpose as well. A viewing window 80 can also be formed in the conductive member 76.

The indicator light can be seen through this display window. The conductive mesh fabric 72 can be grounded to the ground of the terminal device by a grounding cable 84.

A protrusion is formed behind the display window 80 within the frame 74. In one embodiment shown in FIG. 11, the upper wall 8 of the cavity
6 is formed by a part of the conductive member 78. The lower wall of the cavity is formed over the rear portion of the filter screen frame γ4.

In FIGS. 11, 13 and 14, a conductive mesh filter screen is designated by the reference numeral 90.

To electrically connect conductive member 76 to indicator light 82 , conductive upper wall 86 of the cavity makes electrical contact to metal contact member 92 . The contact member 92 electrically contacts a lead 94 on a first side of the indicator light 84 . Electrical connections are made to the conductive mesh filter screen 90 via a metal plate 96 on the top of the screen. The second indicator light 82
The lead 98 on the side contacts the metal plate 96. The metal plate 96 actually makes electrical contact to the mesh with small areas rather than points.

Of course, the indicator light 82 needs to have characteristics that respond to the relatively low level of human body static electricity that charges the user. Gilway (Gll) whose ionization potential is 85 volts
A neon tube type N501 has been found to be sufficient for this purpose. At neon tube lighting thresholds at or below this value, the operation of the neon tube as an electrostatic discharge indicator has been found to be independent of ambient conditions.

In this way, the indicator light is provided in the discharge path between the conductive member 76 and the conductive mesh filter section 90.

Discharging the electrical charge through the conductive mesh in this manner allows the mesh to act as a current limiting fuse in the event of an electrical problem in the CRT hole.

Although the present invention has been described above with reference to embodiments, the present invention is not limited to these embodiments.

For example, other aspects of the electrical contact members, such as the use of conductive adhesives, may vary within the spirit of the invention.

[Brief explanation of the drawing]

1 is a perspective view illustrating a video display terminal and related structures along with one embodiment of a filter screen to contain radiation and static electricity generated in and around the cathode ray tube of the video display terminal; FIG. The figures are a front view of the filter screen shown in figure 1 which suppresses radiation and static electricity once the contact plate of the present invention has been added, figure 3 is a side view of the device shown in figure 2, and figure 4 is a side view of the device shown in figure 2. FIG. 5 is a cross-sectional view taken along line 5--5 in FIG. 4, and FIG. 6 is an elevational view of one embodiment of the contact plate, and FIG. Assembly drawing showing the contact plate of Fig. 4, Fig. 7
Figure 8 is a perspective view of the contact plate showing a state where it is attached to a terminal device; Figure 8 is a side view showing another way of attaching the contact plate;
10 is a perspective view of a front-mounted filter screen embodying the present invention; FIG. 11 is a perspective view of a filter screen of the present invention; FIG. A cutaway perspective view of the indicator light in the frame, Figure 12 is a top view of the indicator light in Figure 11, and Figure 13 is a perspective view of the indicator light in Figure 11.
Side sectional view of the indicator light and frame shown in Figure 14
The figure is a partially sectional end view of the indicator light frame shown in FIG. 11. 12... Video display terminal device, 16... Frame, 17... Filter screen, 18... Display surface, 26... Ground wire, 40... Contact plate, 42
...Body part, 62...Access hole, 70...
...Front mounting is a filter, 72... Conductive mesh material,
74... Frame, 76... Conductive member, 7th... Contact surface, 82... Indicator light, 84... Ground cable, 90... Conductive mesh filter. Screen, 96... Metal plate. 100 engravings of Figure 100 (FIG with no changes in content) 0゜FIG 8 FIG, J4゜FIG 9 FIG, +2゜FIG, J3゜ Procedural amendments included, Mr. Commissioner of the Japan Patent Office 1 12,211,
Display of incidents

Claims (2)

[Claims] (1) A cathode ray tube and a conductive mesh material disposed within the frame, which is provided over and grounded to the display surface of the cathode ray tube, in order to discharge the electric charge accumulated on the user. an electrically conductive mesh filter screen comprising: an electrically conductive member having a body portion of a predetermined length forming a contact surface for contact by the user; and means for mechanically and electrically attaching a filter screen to the grounded filter screen, wherein the body portion of the member is formed and arranged to be accessible to a user of the display terminal, thereby providing access to the user of the display terminal. A device for use in a video display terminal device for discharging charges accumulated in a user, wherein the user contacts the member at the contact surface to discharge static charges. (2) A method for discharging electrical charges accumulated in a user of a video display terminal device including a cathode ray tube and a conductive mesh filter screen provided on a display surface of the cathode ray tube, comprising: providing an electrically conductive member having a contact surface that contacts the electrically conductive member; providing an indicator light that can be illuminated in response to an electrostatic discharge from the user; providing a series discharge path to ground; and discharging the electric charge on the user through an indicator light and the entire mesh filter screen by contacting the contact surface. A method for discharging electrical charges accumulated on a user of a video display terminal device.