Patent ID: 8441747
Filing Date: 2013-05-14
Classification: G02B,G03B,G03F

Abstract:
1. An optical module, comprising: an optical element and a retaining device to hold the optical element, wherein the optical element has a main extension plane, in which it defines a radial direction R and a circumferential direction U, the optical element in the region of its periphery has a contact surface, the retaining device has a plurality of contact elements, which are designed to be resilient and contact the optical element in the region of the contact surface, at least one of the contact elements has a spring section, which is formed in the manner of a leaf spring, the spring section has a bending axis, which runs substantially tangentially to the circumferential direction U, the retaining device has an annular retaining element extending in the circumferential direction U, the contact elements are connected monolithically to the annular retaining element; the retaining device has an annular retaining structure extending in the circumferential direction U, the annular retaining element is connected by at least one uncoupling element to the annular retaining structure at a location, at the location, the uncoupling element restricts at most two degrees of freedom, the optical module is configured to be used in microlithography, and the at least one uncoupling element restricts the degree of freedom perpendicular to the main extension plane of the optical element and the degree of freedom tangential to the circumferential direction U.