G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 27/14 (2006.01)
Patent
CA 2546832
A collimating image-forming apparatus comprising a first linear polarizer is disclosed. A first quarter~wave plate (14) is disposed adjacent the first polarizer (12) and has its fast and slow axes at substantially 45~ to the plane of polarization of the first polarizer. The apparatus further comprises a beam-splitting curved mirror (16) having a convex surface adjacent the first polarizer and facing towards the first quarter-wave plate, a second quarter- wave plate (22) adjacent the concave side of the curved mirror, the second quarter~wave plate having its having its fast and slow axes oriented with respect to the corresponding axes of the first quarter-wave plate at angles substantially equal to a first integral multiple of 90~, and a reflective- transmissive polarizing member (24) adjacent the second quarter-wave plate. A second linear polarizer (26) is adjacent the reflective-transmissive polarizing member, the second linear polarizer having its plane of polarization oriented with respect to the plane of polarization of the first linear polarizer at an angle substantially equal to a second integral multiple of 90~, both of the multiples being even or both being odd.
L'invention concerne un dispositif de formation d'image à collimation qui comprend un premier polariseur linéaire. Une première plaque quart d'onde est en position adjacente à ce polariseur, ayant ses axes rapide et lent orientés sensiblement à 45· par rapport au plan de polarisation du premier polariseur. Le dispositif comprend aussi un miroir courbe diviseur de faisceau à surface convexe adjacente au premier polariseur et faisant face à la plaque quart d'onde, une seconde plaque quart d'onde adjacente au côté concave du miroir courbe, ayant ses axes rapide et lent orientés par rapport aux axes correspondants de la première plaque quart d'onde selon des angles sensiblement égaux à un premier multiple entier de 90·, et un élément polarisant à réflexion-transmission adjacent à la seconde plaque quart d'onde. Un second polariseur linéaire est adjacent à l'élément polarisant à réflexion-transmission, ayant son plan de polarisation orienté par rapport au plan de polarisation du premier polariseur selon un angle sensiblement égal à un second multiple entier de 90·, les deux multiples étant pairs ou impairs.
Ruhle Frank
Weissman Paul
Gierczak Eugene J. A.
Ruhle Companies Inc.
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