Abstract: A composite body is joined together of at least two bodies (13, 16), wherein the first body (16) is a component—or monolithically comprises a component—with very stringent requirements on the precision of its surface (typically an optical component) and wherein the second body (13) can have the broadest diversity of functions, for example carrying parts of a position-measuring arrangement or optical surfaces. Each of the two bodies (13, 16) has at least one connecting surface area (21), and the at least two respective connecting surface areas (21) lie opposite each other. Within the at least one connecting surface area (21) of one of the two bodies (13, 16) or in the proximity of said connecting surface area (21), at least one constructive means is arranged for isolating the first body (16) and/or the second body (13) from deformation.

Abstract: An optical assembly comprises a connecting body (1) consisting of at least a first and a second part (3, 4), the body (1) being connected to an assembly means (2) of a ceramic material wherein the assembly means (2) consists of at least a first and a second part (17, 18) separated by a gap (19).

Abstract: There is provided an optical element comprising an optical element body, a reflecting area and an optical passageway. The optical element body defines an axis of rotational symmetry. The reflecting area is disposed on the optical element body and adapted to be optically used in an exposure process. The optical passageway is arranged within the optical element body and allows light to pass the optical element body, the optical passageway being arranged eccentrically with respect to the axis of rotational symmetry.

Abstract: A composite body is joined together of at least two bodies (13, 16), wherein the first body (16) is a component—or monolithically comprises a component—with very stringent requirements on the precision of its surface (typically an optical component) and wherein the second body (13) can have the broadest diversity of functions, for example carrying parts of a position-measuring arrangement or optical surfaces. Each of the two bodies (13, 16) has at least one connecting surface area (21), and the at least two respective connecting surface areas (21) lie opposite each other. Within the at least one connecting surface area (21) of one of the two bodies (13, 16) or in the proximity of said connecting surface area (21), at least one constructive means is arranged for isolating the first body (16) and/or the second body (13) from deformation.