How does PDR's Focused IR work?
In principle a component is subjected to a ‘micro oven’ environment, being carefully heated to reflow from above and below.
Focused IR is generated from a 150w tungsten-halogen lamp. An IR spot is projected through a series of special lenses and focused on to the component. The component being heated is isolated from adjacent by adjusting the IR spot to size with an iris.
As well as heat from above, there are quartz IR heaters to preheat the PCB from below, non-contact sensors measure component and PCB temperatures during the process.
In a multi-zone process all temperatures and times are easily adjusted and controlled. The process is exceptionally clean, easy to create and precisely repeatable.