Mirror objective arrangement

Details Mirror objective arrangement Mirror objective arrangement

1992-06-22

1994-04-26

Look, Edward K.

Electric heating

Metal heating

By arc

359859, 359863, 21912174, B23K 2606

Patent

active

053068920

ABSTRACT:
The invention is directed to a pancratic mirror objective system for laser focussing and especially for laser machining apparatus. The pancratic mirror objective system preferably includes a convex paraboloid mirror and an ellipsoid mirror. The ellipsoid mirror can be approximated by a toric or spherical form. The focus F.sub.1 of the paraboloid mirror P and the first focus of the ellipsoid mirror E are coincident. By rotating the ellipsoid mirror E about the axis parallel to the incident laser beam through the first focus F.sub.1, the effective image side aperture (for example K=4 to K=8) and the focal length are varied. The track control compensates for the movement of the focus F.sub.2 in laser machining apparatus.

REFERENCES:
patent: 3790258 (1974-02-01), Rambauske
patent: 4030816 (1977-06-01), Belke et al.
patent: 4161351 (1979-07-01), Thomas et al.
patent: 4518232 (1985-05-01), Dagenais
patent: 4547650 (1985-10-01), Arditty et al.
patent: 4812613 (1989-03-01), Gorisch
"Unobscured-aperture two-mirror systems" by R, Gelles, Journal of the Optical Society of America, vol. 65, No. 10, 1975, p. 1141.

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