Electric heating – Metal heating – By arc
Patent
1983-06-29
1985-02-12
Albritton, C. L.
Electric heating
Metal heating
By arc
219121LK, 219121LQ, 219121LR, 219121LT, 350274, B23K 2700
Patent
active
044993625
ABSTRACT:
Apparatus for converting a continuous incident laser beam into a pulsed laser beam, with a duty cycle of pulsation that is substantially continuously variable between a minimum value and a maximium value, is disclosed. The apparatus uses a rotatable disc of nontransmissive material which has a plurality of apertures and adjacent nontransmissive portions disposed in an annular zone. The ratio of the width of each aperture to the width of the adjacent nontransmissive portion substantially continuously varies radially from a minimum ratio to a maximum ratio. As the disc is rotated, the beam is alternately transmitted and blocked, so that a pulsed output beam emerges. The duty cycle of the beam can be adjusted by radially varying the point of incidence of the incident beam within the annular zone so that it impinges on the zone at a radius at which the ratio of widths is at a desired value. Such apparatus can be used in a system for perforating a web of sheet material with a pulsed laser beam.
REFERENCES:
patent: 2589414 (1952-03-01), Martin et al.
patent: 3942878 (1976-03-01), Engel et al.
patent: 4118619 (1978-10-01), McArthur et al.
Albritton C. L.
Giannetti Thomas L.
Ingerman Jeffrey H.
Philip Morris Incorporated
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