Prism and method of producing the same

G - Physics – 02 – B

Patent

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G02B 5/04 (2006.01) C03B 23/047 (2006.01) C03B 33/06 (2006.01)

Patent

CA 2478641

In the prism of the invention, the Ra value is less than the value corresponding to #170 for a surface that serves as a light incidence surface after forming, and a glass parent material having a predetermined size ratio is gripped by a feed means and fed into a furnace, where it is heated to a temperature such that the lowest viscosity is not less than 104 Pa.cndot.s but less than 106 Pa.cndot.s, the lower portion being stretch-formed by a stretch means and cut into long bodies having a desired size and an incident light surface whose surface Ra value is not more than 1/4 of the incident light wavelength, and then such long body being cut into pieces of desired length, thus providing prisms.

L'invention concerne un prisme dans lequel la valeur Ra est inférieure à la valeur correspondant à #170 pour une surface utilisée, après formage, en tant que surface d'incidence de la lumière. Un matériau de type verre présentant une taille prédéterminée est maintenu par un moyen d'alimentation, puis introduit dans un four dans lequel il est chauffé à une température telle que la viscosité la plus basse est comprise entre 10?4¿ et 10?6¿ Pa. La portion la plus basse étant formée par étirement au moyen d'un élément d'étirement, puis elle est découpée en corps longs d'une taille souhaitée présentant une surface d'incidence de la lumière dont la valeur Ra ne dépasse pas ? de la longueur d'onde de la lumière incidente. Ce corps long est ensuite découpé en morceaux de longueur souhaitée afin d'obtenir des prismes.

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