Device for Fixing an Optical Workpiece for its Processing/Treatment and Method of Fixing an Optical Workpiece on such a Device

A method for retaining an optical workpiece (12), particularly a spectacle lens, with a first one of two opposite workpiece surfaces (14, 16) at a retaining device (10) for processing or treating the optical workpiece (12) at a second one of the workpiece surfaces (14, 16), comprising the following steps:

• a) providing the optical workpiece (12) to be processed or treated;
• b) providing the retaining device (10) for the optical workpiece (12), comprising a lower part (20) with a base (24), which has a central base axis (BA) and which comprises an interface (26) for three-dimensionally defined securing to a holder, and a lower wedge section (28) adjoining the base (24) along the base axis (BA) and extending transversely to the base axis (BA), as well as an upper part (22) with a retaining section (30), which has a central retention axis (AA), for the optical workpiece (12) and an upper wedge section (32) adjoining the retaining section (30) along the retention axis (AA) and extending transversely to the retention axis (AA), wherein the lower part (20) and the upper part (22) by the mutually facing lower and upper wedge sections (28, 32) are rotatable relative to one another about a common rotational axis (DA) which is inclined with respect to the base axis (BA) and the retention axis (AA) so that a relative rotation of the upper part (22) and lower part (20) about the rotational axis (DA) produces a relative tilting of the retaining section (30) with respect to the base (24), wherein the retaining device (10) additionally comprises a flexible retaining ring (60) at the retaining section (30), an outer vacuum chamber (38) bounded at least by an end surface (58) of the retaining section (30) and an inner circumferential surface (62) of the flexible retaining ring (60), and an inner vacuum chamber (40), which is sealed relative to the environment by a sealing ring (64), between the lower part (20) and the upper part (22);
• c) ensuring that the desired relative tilting of the retaining section (30) at the upper part (22) with respect to the base (24) of the lower part (20) is present;
• d) placing, with alignment with the retention axis (AA) of the retaining device (10), the optical workpiece (12) by its first workpiece surface (14) on the flexible retaining ring (60) at the retaining section (30) of the upper part (22) of the retaining device (10);
• and
• e) evacuating the inner vacuum chamber (40) and the outer vacuum chamber (38) in common in order at the same time to secure the upper part (22) and lower part (20) of the retaining device (10) to one another in the relative rotational setting thereof about the rotational axis (DA) as well as the optical workpiece (12) to the retaining section (30) of the retaining device (10).