hardware

3D-printed design for mounting the PureThermal3 board onto a microscope lens

A simple 3D-printed design for mounting the PureThermal3 board directly on a Mitutoyo microscope lens of 32.2 mm diameter can be found in this folder. This is used for logging the temperatures of ASICs in a wafer proper during the first powering of the chips while connected with a needle probe-card.

The PCB holder part can be rotated around the bracket parts such that the working distance of 34 mm (Mitutoyo M Plan Apo lenses 10x & 5x) is matched. Elongated mounting holes for the PCB provide further placement flexibility.

Picture of holder attached to retracted Mitutoyo microscope lens inside a SÜSS MicroTech wafer prober: (USB cable wires have been soldered directly onto the D +/- test pads on the back of the PCB and to the VIN and GND power pins)

Files

• CAD design file for Blender 4, using CAD Sketcher AddOn
• lens bracket STL, must printed two times. Put one or two small pieces of shrink-wrap tube around each bracket for best friction.
• PCB holder 'hinge' STL with elongated holes, attachment to lens brackets

Required screws

• 2x M3 screw & 2x M3 nut for closing the bracket, one doubles as rotational axis
• M2 or M2.5 screws or standoff sockets and nuts for fixing the PCB

Further Ressources

• a very nice 3D-printed case, enclosing the complete PureThermal board, including a protective slidable cover, can be found from the ever-so-awesome Pierre Muth here.
• a useful 3D model of a Mitutoyo M Plan Apo lens can be found here.