Device for the optical chopping of a laser beam
OwnerLutz Langhansinventor
Life of this patent
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Abstract
Apparatus for optical chopping of a laser beam into discrete light pulses consisting of a source of laser light, a rotating mirror, a first collecting lens located between the laser source and the rotating mirror, a first system of collecting lenses for receiving light reflected from the mirror, and a second system of collecting lenses which receive light from the first system and direct the light energy in a predetermined pattern on the surface of a substrate such as a moving web of paper to be perforated or divided.
Claims10
Device for the optical chopping of a laser beam into discrete light impulses which sequentially and repeatedly are directed toward a number of target points, characterized by a collecting lens through which the laser beam passes, a rotating mirror whose reflecting surface lies in the focal plane of said collecting lens, a first system of several immediately adjacent collecting lenses arranged in a row, which are swept by the laser beam deflected by the rotating mirror and whose focal planes lie on the reflecting surface of the mirror and a second system of collecting lenses disposed between said first system of lenses and the target points, each lens of second system being respectively assigned a corresponding collecting lens of the first system and the focal planes of the lenses of said second system being on the target points.
A device for treating a substrate by means of a laser beam comprising a rotating mirror for reflecting a laser beam coming from a laser beam source through a system of focussing lenses arranged beside each other and whose focal planes are on the surface of a substrate to be treated, characterized in that between the laser beam source and the rotating mirror there is a first lens unit which focuses the laser beam on the rotating mirror and in that between the rotating mirror and said system of focussing lenses there is a further system of focussing lenses arranged beside each other and whose focal planes are also on the rotating mirror so that the first-mentioned system of focussing lenses is acted upon by parallel rays of light at a constant angle of incidence.
Dependencies are inferred from the claim text.