Heat-treatable dichroic mirrors

G - Physics – 02 – B

Patent

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Details

G02B 5/08 (2006.01) B60R 1/08 (2006.01) B60R 1/12 (2006.01) C03C 17/36 (2006.01) G02B 5/10 (2006.01)

Patent

CA 2376826

A heat-treatable dichroic mirror, comprising a transparent substrate having a glass transition temperature in the range of 650-800 °C, and a plurality of sputtered films carried on said substrate and forming at least two pairs of contiguous films in which the films of each pair have disparate refractive indices differing by at least about 0.2 so as to provide between them a reflective interface. The films include an oxide of a metal such as titanium, a second film comprising an oxidizable metal or semi-metal such as silicon, and a protective overcoat of a thickness and composition sufficient to substantially prevent permeation of oxygen therethrough when heat treated at said glass transition temperature. The mirror, after said heat treatment, exhibits a transmittance of at least 24 % in the wavelength range of 550-650 nm, a reflectance of at least 45 %, and a haze of not greater than about 1 %. Image

L'invention concerne un miroir dichroïque pouvant supporter un traitement thermique, comprenant un substrat transparent présentant une température de transition vitreuse comprise entre 650-800 DEG C, 650 et 800 DEG C et une pluralité de films pulvérisés déposés sur ce substrat et formant au moins deux paires de films contigus, lesquels films présentent des indices de réfraction qui diffèrent d'au moins 0,2 de manière à créer une interface réfléchissante entre eux. Les films comprennent un oxyde d'un métal tel que le titane, un second film comprenant un métal ou un semi-métal oxydable tel qu'un silicium et une couche de protection dont l'épaisseur et la composition sont suffisantes pour éviter sensiblement la pénétration d'oxygène lors du traitement thermique à ladite température de transition vitreuse. Une fois le traitement terminé, le miroir présente un facteur de transmission d'au moins 24 % dans la plage de longueur d'ondes comprise entre 550 et 650 nm, un facteur de réflexion d'au moins 45 % et une turbidité ne dépassant pas environ 1 %.

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