Ambient light trapping filter for cathode ray tubes
First Claim
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1. THE COMBINATION OF A CATHODE RAY TUBE HAVING A VIEWING SCREEN FROM WHICH IMAGE LIGHT EMNATES WITH A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILTER MOUNTED IN FRONT OF AND IN PROXIMITY TO SAID SCREEN, THE GENERAL PLANES OF SID SCREEN AND SAID FILTER BEING SUBSTANTIALLY PARALLEL;
- SAID SCREEN, WHEN ACTIVATED, PRESENTING A SERIES OF ALTERNATING LIGHT AND DARK HORIZONTAL LINES CONSTITUTING A HORIZONTAL RASTER;
SAID FILTER COMPRISING A THIN, TRANSPARENT PANEL BEARING, THROUGHOUT ITS THICKNESS, A PLURALITY OF DEPTHWISE SPACED TIERS OF FILTER ELEMENTS, EACH IN THE FORM OF A LIGHT TRAPPING GRID PATTERN OF HIGHLY LIGHT ABSORBENT MATERIAL;
SAID GRID PATTERN CONSISTING OF NARROW LINES ARRANGED TO FORM A MULTIPLICITY OF ADJOINING HEXAGONAL FRAMES, EACH ENCLOSING A TRANSPARENT AREA SERVING
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1 Claim
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1. THE COMBINATION OF A CATHODE RAY TUBE HAVING A VIEWING SCREEN FROM WHICH IMAGE LIGHT EMNATES WITH A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILTER MOUNTED IN FRONT OF AND IN PROXIMITY TO SAID SCREEN, THE GENERAL PLANES OF SID SCREEN AND SAID FILTER BEING SUBSTANTIALLY PARALLEL;
- SAID SCREEN, WHEN ACTIVATED, PRESENTING A SERIES OF ALTERNATING LIGHT AND DARK HORIZONTAL LINES CONSTITUTING A HORIZONTAL RASTER;
SAID FILTER COMPRISING A THIN, TRANSPARENT PANEL BEARING, THROUGHOUT ITS THICKNESS, A PLURALITY OF DEPTHWISE SPACED TIERS OF FILTER ELEMENTS, EACH IN THE FORM OF A LIGHT TRAPPING GRID PATTERN OF HIGHLY LIGHT ABSORBENT MATERIAL;
SAID GRID PATTERN CONSISTING OF NARROW LINES ARRANGED TO FORM A MULTIPLICITY OF ADJOINING HEXAGONAL FRAMES, EACH ENCLOSING A TRANSPARENT AREA SERVING
- SAID SCREEN, WHEN ACTIVATED, PRESENTING A SERIES OF ALTERNATING LIGHT AND DARK HORIZONTAL LINES CONSTITUTING A HORIZONTAL RASTER;
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Current AssigneeVern E. Hamilton
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Original AssigneeVern E. Hamilton
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InventorsHamilton, Vern E.
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Application NumberUS04/316,355Time in Patent Office749 DaysField of SearchUS Class Current348/834CPC Class CodesH01J 29/896 Anti-reflection means, e.g....
