Laser cut video display terminal filter screen
AssigneeSun-Flex Company, Inc.
InventorMark Gart
Life of this patent
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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.
Claims10
A method of forming a radiation and reflection filter screen for a video display terminal comprising the steps of:
- placing a sheet stock of plastic material on a substantially flat surface;
- focusing a beam of coherent electrical energy toward said plastic sheet on said surface;
- moving said beam in a predetermined pattern to move said beam across and longitudinally along said sheet stock;
- pulsing said beam in accordance with said movement to direct said focused beam in discrete areas across and along said sheet;
- and
- controlling said focusing, pulsing and movement of said beam to cause said beam to ablate said sheet stock in said predetermined pattern.
A sheet material for use in fabricating a filter screen for a video display terminal for reducing radiation and reflection energy from the face of said video display terminal comprising:
- a continuous sheet of plastic material having an electrical conductive surface on at least one side thereof;
- aperture perforations through said sheet in discrete and uniform spacing along and across said sheet:
- said aperture perforations formed by ablating said sheet with a focused laser beam pulsed to produce said discrete and uniformly spaced aperture perforations;
- said filter screen being cut from said sheet and being adapted to be placed in front of the face of said video display terminal;
- and
- said filter screen being electrically connected to electrical ground of said video display terminal to conduct radiated energy away from said face of said video display terminal.
Dependencies are inferred from the claim text.