Ambient light trapping filter for cathode ray tubes
First Claim
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1. THE COMBINATION OF A VIEWING SCREEN FROM WHICH IMAGE LIGHT EMANATES WITH A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILTER MOUNTED IN FRONT OF AND IN PROXIMITY TO SAID SCREEN, THE GENERAL PLANES OF SAID 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 POLYGONAL FRAMES, EACH ENCLOSING A TRANSPARENT AREA SERVING AS A LIGHT PASSAGE;
EACH FRAME BEING ORIENTED SO THAT ALL OF ITS SIDES ARE AT SUFFICIENT ANGLES TO THE HORIZONTAL LINES OF THE RASTER PATTERN TO PREVENT FORMATION OF A MOIRE EFFECT BETWEEN THE GRID LINES AND THE RASTER LINES;
THE LIGHT PASSAGES OF SUCCESSIVE GRID PATTERNS BEING IN DEPTHWISE REGISTRY TO PROVIDE A MULTIPLICITY OF DEPTHWISE DIRECTED VIEWING CELLS;
SAID DEPTHWISE SPACED GRID LINES ACTING INDIVIDUALLY TO TRAP AND ABSORB OFF-AXIS AMBIENT LIGHT RAYS ENTERING SAID CELLS AT VARIOUS ANGLES AND STRIKING SAID GRID LINES AT NEARLY NORMAL ANGLES.
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1 Claim
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1. THE COMBINATION OF A VIEWING SCREEN FROM WHICH IMAGE LIGHT EMANATES WITH A SPACE LATTICE TYPE AMBIENT LIGHT TRAPPING FILTER MOUNTED IN FRONT OF AND IN PROXIMITY TO SAID SCREEN, THE GENERAL PLANES OF SAID 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 POLYGONAL FRAMES, EACH ENCLOSING A TRANSPARENT AREA SERVING AS A LIGHT PASSAGE;
EACH FRAME BEING ORIENTED SO THAT ALL OF ITS SIDES ARE AT SUFFICIENT ANGLES TO THE HORIZONTAL LINES OF THE RASTER PATTERN TO PREVENT FORMATION OF A MOIRE EFFECT BETWEEN THE GRID LINES AND THE RASTER LINES;
THE LIGHT PASSAGES OF SUCCESSIVE GRID PATTERNS BEING IN DEPTHWISE REGISTRY TO PROVIDE A MULTIPLICITY OF DEPTHWISE DIRECTED VIEWING CELLS;
SAID DEPTHWISE SPACED GRID LINES ACTING INDIVIDUALLY TO TRAP AND ABSORB OFF-AXIS AMBIENT LIGHT RAYS ENTERING SAID CELLS AT VARIOUS ANGLES AND STRIKING SAID GRID LINES AT NEARLY NORMAL ANGLES.
- 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 NumberUS04/306,473Time in Patent Office678 DaysField of SearchUS Class Current348/834CPC Class CodesH01J 29/896 Anti-reflection means, e.g....
