Optical collimator

Claim 2

OPTICAL COLLIMATOR FOR GUIDING LIGHT IN AN ACCURATE PREDETERMINED DIRECTION MADE OF TWO STRATIFIED BLOCKS OF THIN SHEETS OF TRANSPARENT MATERIAL COATED WITH APPROPRIATE ADHESIVE, SAID TWO BLOCKS BEING SUPERIMPOSED ON EACH OTHER SO THAT THEIR RESPECTIVE THIN SHEETS ARE ORTHOGONAL, AND SOME SUBSTANCE HAVING THE SAME REFRACTION INDEX AS SAID TRANSPARENT MATERIAL BEING LAID BETWEEN SAID TWO BLOCKS IN ORDER TO AVOID ANY UNDERSIRED REFLECTION OR REFRACTION OF THE LIGHT WHICH PROPAGATES IN SAID PREDETERMINED DIRECTION.

Claim 3

COLLIMATOR IN ACCORDANCE WITH CLAIM 1 ACTING AS OPTICAL PARALLAX CORRECTOR LOCATED AGAINST THE WALL OF A CATHODE RAY TUBE BEARING THE FLUORESCENT SCREEN, FOR IMPROVING THE DEFINITION AND THE CONTRAST OF THE LUMINOUS IMAGES PRODUCED BY SAID TUBE, COMPRISING IN COMBINATION: A FIRST BLOCK OF THIN SHEETS OF TRANSPARENT MATERIAL RESISTANT TO ULTRAVIOLET RADIATION AND HAVING A GREAT LIGHT TRANSMISSION EFFICIENCY, AID FIRST BLOCK BEING LOCATED AGAINST THE WALL OF SAID TUBE AND A THIN LAYER OF LIGHTABSORBING MATERIAL BEING INSERTED BETWEEN CONSECUTIVE SHEETS OF SAID FIRST BLOCK, A SECOND BLOCK OF THIN SHEETS OF TRANSPARENT MATERIAL WITH GREAT LIGHT-TRANSMISSION EFFICIENCY, A THIN LAYER OF LIGHT-REFLECTING MATERIAL BEING INSERTED BETWEEN CONSECUTIVE SHEETS OF SAID SECOND BLOCK, SAID SECOND BLOCK BEING SUPERIMPOSED UPON SAID FIRST BLOCK SO THAT THE THIN SHEETS OF ONE ARE ORTHOGONAL TO THOSE OF THE OTHER, AND A THIN LAYER OF SAME REFRACTION INDEX AS THE TRANSPARENT MATERIAL OF SAID THIN SHEETS BEING INSERTED BETWEN SAID FIRST AND SECOND BLOCKS, WHEREBY SAID TWO BLOCKS COOPERATE FOR PRODUCING THE SAME LIGHTGUIDING EFFECT AS A BUNDLE OF VERY THIN FIBERS OF VERY SMALL CROSS SECTION, BUT AT A MUCH SMALLER COST.

Claim 4

OPTICAL PARALLAX CORRECTOR IN ACCORDANCE WITH CLAIM 3 AND LOCATED BETWEEN A CATHODE RAY TUBE FOR BLACK AND WHITE TELEVISION AND A PHOTOGRAPHIC FILM BEARING JUXTAPOSED ELEMENTAL AREAS OF THE THREE PRIMARY COLORS SPECIFIED FOR COLOR TELEVISION, IN WHICH ALL THE SHEETS OF SAID CORRECTOR ACT AS LIGHT-GUIDES WITH A UNIFORMLY GREAT LIGHTTRANSMISSION EFFICIENCY IN THE WHOLE VISIBLE SPECTRUM, AND IN WHICH THE SHEETS LOCATED AGAINST THE WALL OF SAID TUBE BEARING THE FLUORESCENT SCREEN ARE MADE OF A MATERIAL RESISTANT TO ULTRAVIOLET-RADIATION, WHEREBY A COLOR TELEVISION RECEIVER CAN BE OPERATED WITH THE CHEAP CATHODE RAY TUBES FOR MONOCHROME TELEVISION.