Abstract: A filter screen for a video display terminal is formed by ablating a sheet of plastic material with an excimer laser beam to produce desired apertures in the sheet spaced by webs of the sheet material. The filter screen formed in this manner can produce clean cut apertures in the sheet material and the retained material or webs between the apertures can be reduced to small dimensions because of the control of the laser beam. The sheet material can be coated for optical reflection control and for radiation control either before or after formation as the filter screen. The filter screen and the method for its formation is disclosed.

Abstract: A combined glare and radiation and static electricity suppression device, for use on the face of a cathode ray tube, consisting of an opaque, conductive mesh, and a spherical frame which is preformed to the same curvature as the cathode ray tube and serves to conform the mesh to the tube and hold the device in place. The frame is painted with a conductive paint on the side where the mesh is bonded to the frame. The bonding is done using a solvent which softens the paint without affecting the conductive contact between the paint and the mesh. A grounding connection is connected to the conductive side of the frame to a grounding point on the assembly including the cathode ray tube. The mesh, when grounded, minimizes static field build-up and significantly reduces the electric component of electromagnetic radiation emanating from the cathode ray tube and passing through the front of the tube. The device is also effective to reduce glare from illumination from in front of the tube.

Abstract: A coordinate sensing device uses electric currents to energize a conducting member which has a major surface and preferably is made of mesh material. Electrical currents are sequentially applied to create alternate noncoincident electrical fields so that when a probe is applied to the surface, the obtained electrical potentials can be compared to a reference potential. The resulting potential differences may then be conveniently converted to appropriate signals. The conducting member is not limited as to shape or construction; hence, it may also act as an anti-glare device for a cathode-ray tube. The fields created by the electrical currents need not be uniform.