Alternative providers usually combine normal LEDs with simple deflection foils to change the beam angle. This leads to sub-optimal contrasts, as the beam direction is only slightly inclined and the ‘light cones’ overlap unfavourably in the tilting plane due to the large aperture angle.
In contrast, each individual LED in the MST-PSL is tilted. The chosen arrangement allows lateral tilt angles of up to 60°, with 35° representing a good compromise between LED packing density and image contrast. At the same time, the lateral aperture angle of the individual LEDs is limited to ±10°. In addition, the light is focused by a rod lens in the transport direction, the position of which can be optimised for different working distances. The system easily achieves an irradiance of 2 kW/m² at a working distance of 100 mm. Further optimisations, such as adapted cooling and ‘over-flashing’ of the LEDs, should enable outputs of up to 3 kW/m² to be achieved.
For the first product, the concept of a double light was chosen, in which two lighting directions share a heat sink. This simplifies mechanical integration with a fixed working distance and saves space, so that the system can be accommodated in an installation space of less than 400 mm.
