Antiglare supports and contrast amplifying supports for...

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Patent

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G01N 21/21 (2006.01) G01B 11/00 (2006.01) G01D 11/30 (2006.01) G01J 4/00 (2006.01) G02B 21/26 (2006.01)

Patent

CA 2489581

The invention concerns a support designed for observing between intersecting polarizers an object located in its vicinity in a medium (3) of index n¿0? with incident convergent incoherent illumination under an angle .theta.¿0? at a wavelength .lambda.. Said support comprises a substrate (1) with complex refractive index n¿2? and a layer (2) of refractive index n¿1? and thickness e¿1?. According to the invention, the value of the thickness e¿1? of the layer (2) is at .plusmn. 2 % such that d¿2?/de?2¿¿1?? ¿1nI.sigma.I?2¿ = 0 with .sigma. = .sigma.¿01? + .sigma.¿12?(1 + .pi.¿01?)e?(-2j.beta.¿¿1??) ¿+ .sigma.¿01?.pi.¿12?e?(-4j.beta.¿¿1??)¿/1 + r¿01(p)? + r¿12(p)?e?(-2j.beta.¿¿1??)¿)(1 + r¿01(s)?r¿12(s)?e?(-2j.beta.¿¿1??)¿). The invention also concerns observation devices incorporating such a support.

L'invention concerne un support destiné à l'observation entre polariseurs croisés d'un objet placé à son voisinage dans un milieu (3) d'indice n0 avec un éclairage incohérent convergent incident sous un angle .theta.0 à une longueur d'onde .lambda.. Ledit support comprend un substrat (1) d'indice de réfraction complexe n2 et une couche (2) d'indice de réfraction complexe n1 et d'épaisseur e1. Selon l'invention, la valeur de l'épaisseur e1 de la couche (2) est à 2% près telle que (I) avec (II). L'invention concerne aussi des dispositifs d'observation incorporant un tel support.

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