| 摘要 |
PCT No. PCT/DK96/00102 Sec. 371 Date Sep. 15, 1997 Sec. 102(e) Date Sep. 15, 1997 PCT Filed Mar. 15, 1996 PCT Pub. No. WO96/28302 PCT Pub. Date Sep. 19, 1996A method for activating photoinitiators in photosensitive substrates (6) like for instance printing inks, lacquers, and glue which set by radiation with UV light, and in which the photosensitive substrate and a light unit are moved relative to each other at a predetermined rate, the light unit comprising a UV light source (4) placed in a lamp housing (1) with a reflector (2, 10) for directing the UV light towards the substrate through an outlet opening, and in which the light emission is controlled by means of a control unit (50) emitting a signal to an electronic ballast (30) for the UV light source (4) depending on the mutual travel speed between the light unit and the substrate (6) and other predetermined parameters. With a view to obtaining an optimized utilization of the light effect emitted by the light source and a long duration of the light source (4) the electronic ballast (30) is of the type emitting an alternating voltage of substantially squarewave shape and substantially without interrupting the emission of current by changing poles thereof, and in that the light unit (4) is provided with means (2, 10, 17) for focusing both the direct light from the light source and the light emitted by the reflectors in a line (5) of light running parallel with the light source (4).
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