Optics: measuring and testing – By alignment in lateral direction – With light detector
Patent
1992-04-21
1994-04-05
Evans, E. L.
Optics: measuring and testing
By alignment in lateral direction
With light detector
356375, 355 97, 414225, G01B 1100
Patent
active
053010132
ABSTRACT:
A positioning device has two transport arms for alternately transferring plate-shaped objects from a storage position into an operational position. The transport arms are each displaceable by means of a separate manipulator, so that a quick exchange of the objects is possible. The manipulators each comprise two parallel Y-guides which are fastened to a frame, and an X-guide which is displaceable along the two Y-guides, while the transport arms are each displaceable along one of the X-guides. The positioning device is used in an optical lithographic device for alternately placing masks on a mask support. A machine frame of the optical lithographic device to which the mask support is fastened is coupled to the frame of the positioning device by spring members. To render an accurate positioning of the masks on the mask support possible, the optical lithographic device is provided with an optical sensor system which is coupled to an electronic control unit for controlling the positioning device.
REFERENCES:
patent: 4676637 (1987-06-01), Uto et al.
patent: 4999671 (1991-03-01), Iizuka
Markvoort Jan A.
Meijer Hendricus J. M.
Rozenveld Johannes A.
van der Maaden Johan
Van Eijk Jan
Biren Steven R.
Evans E. L.
U.S. Philips Corporation
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