F
igure 4 shows the back of the unit;
once you have removed the protective
cover, with the large central fan sur-
rounded by the driver circuitry. In oper-
ation, this fan will speed up and slow
down as needed. I found that it rarely
came on when using one or two colors,
and gradually increased as I added
more channels. With all four LED chan-
nels in use, it quickly got up to full
speed. I ran the fixture for many hours
in my workshop, and the light output
varied very little with temperature.
Optics
Mounted above the LED board is a
complex sandwich of plates and opti-
cal devices that together form the
homogenization, beam angle control,
and spill-limitation systems. I’ll work up
through the layers. Immediately above
the LED packages is a fixed plate fitted
with large plastic TIR (total internal
reflection) lenses that bring the beam
angle down from that native 120°.
Figure 5 shows the rear of the lenses,
which look like large solid cones. The
cup in the pointed end of each of those
cones fits over an LED package. Each
TIR lens, as shown in Figure 6, is fitted
with an output micro lens array of its
own. This, I assume, serves two pur-
poses: Firstly, it helps homogenize
those four LED emitters into a single
beam; secondly, it forms the first, fixed,
group in the two-group zoom system.
The next element in the stack is a
moving plate, which contains another
set of micro lens arrays, as shown in
Figure 7. These lenses line up with
those in Figure 6, forming a myriad of
small zoom lens systems with nearly
100 micro lenses for each emitter. The
other side of this plate has tiny egg-
crates (Figure 8) with one hexagonal
compartment around each of the micro
lenses. Presumably, these egg-crate
louvers serve to confine the beam and
reduce spill and extraneous light. This
entire plate, with the micro lenses on
one side and the egg-crates on the
other, is moved axially by four stepper-
motor linear actuators to change the
beam angle of the system. You can see
the actuators as the four white objects
in the corners of Figure 4.
On top of all this, there is a larger
egg-crate plate with 37 cavities, one
Figure 6: Micro lenses on TIR
Figure 7: Zoom lens array
Figure: Micro egg crates
Figure 9: Output egg crate
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2.4GHz DIGITAL WIRELESS INTERCOM SYSTEM
CIRCLE READER SERVICE 41
(11 pages)
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