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 17/00 (2006.01) C03C 17/36 (2006.01) G02B 5/10 (2006.01)

Patent

CA 2348460

A heat-treatable dichroic mirror, comprising a transparent sub- strate (12) having a glass transition temperature in the range of 650 - 800 °C, and a plurality of sputtered films (14, 16, l8) carried on said substrate and forming at least two pairs of contiguous films it 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 (22). The films include an oxide of a metal such as titanium, a sec- ond film comprising an oxidizable metal or semi-metal such as silicon, and a protective overcoat (20) 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 550 - 650 nm, a reflectance of at least 45%, and a haze of not greater than about 1%.

L'invention concerne un miroir dichroïque pouvant être thermotraité comprenant un substrat (12) transparent ayant une température de transition vitreuse oscillant entre 650 et 800 DEG C et une pluralité de films (14, 16, 18) pulvérisés supportés 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 recevoir une interface réfléchissante intermédiaire (22). Les films comprennent un oxyde d'un métal tel que le titane, un second film comprenant un métal ou semi-métal pouvant s'oxyder tel qu'un silicium et une couche de protection (20) dont l'épaisseur et la composition sont suffisantes pour éviter sensiblement la pénétration d'oxygène lors du thermotraitement à ladite température de transition vitreuse. Le miroir, une fois le traitement terminé, présente une transmittance d'au moins 24 % dans la plage de longueur d'onde 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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