Abstract: A device and a method for detecting and distinguishing between shelf-forming supports in cassettes and disk-shaped objects deposited thereon are provided for increasing accuracy in the determination of the position of shelves and objects as well as reliability of detection in distinguishing between cassette types without a disruptive influence being exerted on the objects by the inserted protective supports. The objects and different types of supports for the objects which are distinguished through an offset arrangement in the measurement plane pass through measurement beam bundles with their end sides, wherein each of the measurement beam bundles is situated in the region of only one type of support. The extension of the end sides of the supports in the measurement plane is completely detected by the measurement beam bundle. The device is used for the fabrication of integrated circuits.

Abstract: A device and a method for detecting and distinguishing between shelf-forming supports in cassettes and disk-shaped objects deposited thereon are provided for increasing accuracy in the determination of the position of shelves and objects as well as reliability of detection in distinguishing between cassette types without a disruptive influence being exerted on the objects by the inserted protective supports. The objects and different types of supports for the objects which are distinguished through an offset arrangement in the measurement plane pass through measurement beam bundles with their end sides, wherein each of the measurement beam bundles is situated in the region of only one type of support. The extension of the end sides of the supports in the measurement plane is completely detected by the measurement beam bundle. The device is used for the fabrication of integrated circuits.

Abstract: The invention relates to a displacement system for ophthalmologic examination units constituted of an instrument base section and an accessory section for mounting three ophthalmologic devices, said accessory section being connected by two lever means to said base section to enable displacement of the former relative to the latter from a first end position via an intermediate position into a second end position in the latter two positions relative to the said first end position the accessory section is displaced in parallel and at right angles relative to the base section so that the accessory section projects past over the base section. In this manner the opthalmologic devices are brought into an operation position in front of a patient and operator. A further lever system in combination with the lever means pivots a head rest to a patient in the intermediate and second end position, which head rest remains unchanged even when the ophthalmologic devices are changed for operation.