Illumination unit for banknote testing device, has light intensity of laser light source reduced by using optical fibre light guide for increasing light output surface area

摘要

The illumination unit has a laser light source (1) coupled to an optical fibre light guide (6) having a light output surface which is greater in area than the light radiation surface of the light source, so that the light intensity at the light output surface of the light guide is reduced, for preventing skin damage.