Recorders – Printing – dotting – or punching marker – Ink transfer support or moving means
Patent
1988-09-19
1990-08-28
Reinhart, Mark L.
Recorders
Printing, dotting, or punching marker
Ink transfer support or moving means
250226, 2502011, G01D 1514, G01J 120
Patent
active
049529455
ABSTRACT:
An exposure apparatus comprises a projection optical system, to project the image of an object on a first plane onto a second plane, a laser means for outputting a light beam to the projection optical system for projection, a measuring device for detecting a fluctuation of the optical characteristic of the projection optical system attributable to deviation of the wavelength of the light beam output from the laser and a control device responsive to the measuring device to adjust the wavelength of the light beam.
REFERENCES:
patent: 4458994 (1984-07-01), Jain et al.
patent: 4629313 (1986-12-01), Tanimoto
patent: 4666273 (1987-05-01), Shimizu et al.
patent: 4703166 (1987-10-01), Brunning
Nikon Corporation
Reinhart Mark L.
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