Focusing SMD led - Convex? Flat? Concave? - no edge lighting wanted.
I have made a PCB with LED indicators, pushbuttons, etc.
What is the optimum shape for the machined cavity above the LED in the underside of the acrylic? Colored stuff below...
I want it to look like a nice indicator light so the shape will determine how the operator sees the indicator. I will make a special tool to machine the shape.
I don't need or want any side lighting in the panel. Just nice looking indicators.
There are single 0805 LEDs and some have 2 0805 LEDs really close together, RED and GREEN.
When off it should just look like a cloudy round 5mm area. When on shows the color with some focusing to improve contrast. There is engraved text adjacent to the indicators. This does not need illuminating. It is just engraved through the black paint.
Viewing angle +/- 45º is OK, then reduced intensity is fine, something like looking at a standard thru-hole 3mm or 5mm LED.
3mm acrylic
top SIDE:
only some through holes
bottom SIDE:black painted, then engraved lettering from behind. Holes for pushbuttons and other plugs.
rear engraved cavity for light from LED, multiple places. WHAT SHAPED ROUND CAVITY? FLAT bottom? Convex? Concave?
middle layer 1.5mm spacer
Has windows for the LEDs and pushbuttons
bottom layer 1.6mm component PCB
All SMD max height 1.5mm. SMD 0805 LEDs
Steel panel. The above 3 layers are stacked and screwed to panel.
Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.