Radiant energy detecting device using disc shaped reticle

Claim 1

IN A SYSTEM FOR DETECTING A PREDETERMINED TYPE OF ENERGY IN AT LEAST A PORTION OF THE ELECTROMAGNETIC ENERGY SPECTRUM, THE COMBINATION COMPRISING: APPARATUS HAVING A FIELD OF VIEW FOR COLLECTING ENERGY OF SAID PREDETERMINED TYPE WITHIN SAID FIELD OF VIEW AND FOCUSING AN IMAGE OF SAID FIELD OF VIEW AT A PREDETERMINED IMAGE PLANE, SAID ENERGY COLLECTION APPARATUS BEING CONSTRUCTED TO FOCUS RADIATION OF SAID PREDETERMINED TYPE OF ENERGY FROM ANY SOURCE IN SAID FIELD OF VIEW TO A TRANSVERSE DIMENSION AT SAID IMAGE PLANE NO LESS THAN A PREDETERMINED BLUR CIRCLE DIAMETER; AND A RETICLE INCLUDING AN APPROXIMATELY DISCSHAPED BODY POSITIONED TO ROTATE ABOUT AN AXIS APPROXIMATELY PERPENDICULAR TO SAID IMAGE PLANE AT THE POSITION THEREOF TO INTERCEPT SAID IMAGED FIELD OF VIEW, THE TRANSVERSE CROSS-SECTIONAL AREA OF AT LEAST ONE MATERIAL OF SAID RETICLE BEING RELATIVELY OPAQUE TO SAID COLLECTED ENERGY, SAID RELATIVELY OPAQUE AREA CURVING TO DEFINE AN AREA RELATIVELY TRANSPARENT TO SAID COLLECTED ENERGY BETWEEN ARCUATE TURNS OF SAID RELATIVELY OPAQUE AREA, BOTH OF SAID AREAS HAVING UNIFORM EQUAL WIDTHS THROUGHOUT THEIR LENGTHS, SAID WIDTH BEING SUBSTANTIALLY EQUAL TO SAID BLUR CIRCLE DIAMETER, BOTH OF SAID AREAS ALSO EXTENDING BOTH RADIALLY AND CIRCUMFERENTIALLY FROM A CENTER AREA OF INCEPTION.