Patent ID: 7057162

Claim:
An apparatus for positioning an optical component, arranged in a receiving device together with several optical components, said apparatus comprising: said receiving device being rotatable about an axis or movable along a direction and being retainable in several retention positions; said optical component being positionable in a corresponding retention position; a coding device having at least one first coding means with a first width and at least one second coding means with a second width, and two detectors for detecting the first and second coding means; wherein said coding device or the two detectors are associated with said receiving device; wherein the two detectors detect the first and second coding means at spatially different points, and wherein said coding device is embodied in such a way that the two detectors detect the first coding means simultaneously when the receiving device is located in a retention position, and no more than one of the two detectors detects the second coding means when the receiving device is located in a region between two adjacent retention positions.