Device for treating substrates, in particular for perforating pa

Details Device for treating substrates, in particular for perforating pa Device for treating substrates, in particular for perforating pa

1996-03-15

1997-11-04

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359 17, 359197, 2191217, G02B 2608

Patent

active

056846177

ABSTRACT:
In a device for perforating cigarette paper strips, a row of adjacent optical elements (28) is disposed in the ray path of a laser beam deflected by a rotating mirror (12). Each of the optical elements includes a diffractive optical element (DOE) (24'; 24"; 24'") and a convergent lens (18'; 18"; 18'"). A parallel bundle of laser rays hits the surface of the DOE, and the DOE emits one or more bundles of rays with a desired configuration. The convergent lens produces therefrom in the plane of the cigarette paper strip (20) one or more focal spots, for example two or four mutually offset focal spots (22a, 22b) or a ring focus, so that one can form not only microperforations by individual focal spots but also macroperforations by applying energy to only the peripheral area of a macroperforation rather than the entire perforation area.

REFERENCES:
patent: 4265254 (1981-05-01), Koch et al.
patent: 4378480 (1983-03-01), Langhans

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