Quartz glass plates with high refractive index homogeneity
AssigneeSchott Glass
InventorsRolf Martin, Andreas Menzel, Frank Coriand, Wolfgang Schmidt
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Abstract
A method produces homogenous quartz glass plates without streaks. The method is applied to starting quartz glass body which has an X—X geometrical axis and good refractive index homogeneity in its central area, and a refractive index homogeneity decreasing as the axis lies further from a central area. The body is divided into at least two concave parts by longitudinal cuts parallel to the axis once the central area has been processed out of the body. The parts are placed separately in corresponding molds and heated therein such that they are molded to form quartz glass plates having a desired thickness.
Claims12
A method for producing quartz glass plates of high refractive index homogeneities from a cylindrical quartz glass body having a high refractive index homogeneity along its geometrical axis and in circumferential direction, and a variable refractive index curve at least approximately in rotational symmetry to a cylinder axis X—X, comprising:
- cutting out an interior portion of said cylindrical quartz glass body to form a ring shaped body;
- separating the ring shaped body into at least two concave parts along separation cuts substantially parallel to the axis X—X;
- separately inserting said at least two concave parts into corresponding moulds;
- and
- heating said at least two concave parts in said moulds such that said at least two concave parts are respectively transformed into quartz glass plates of a desired thickness.
Dependencies are inferred from the claim text.