G - Physics – 03 – B
Patent
G - Physics
03
B
88/94.5
G03B 13/36 (2006.01) G02B 7/04 (2006.01) G11B 7/09 (2006.01) H04N 5/232 (2006.01)
Patent
CA 1144792
20-11-1979 1 PHN 9597 ABSTRACT: Optical focussing-error detection system. A focussing error detection system is described for determining deviations between the plane of imaging of an objective system in an optical arrangement and the radiation-reflecting surface in said system. The apparatus comprises an optical element by means of which a radiation beam coming from the radiation reflecting surface is both rendered astigmatic and separated from a radiation beam which is directed to the radiation-reflecting surface. By the use of this element the number of components of the focussing-error detection system can be minimized and a compact construction of said system can be obtained.
361447
Heemskerk Jacobus P.j.
Renes Hendrik
Simons Carel A.j.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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