Assembly Recommendation
1. Insert the sensor and all other electrical components
into the application PCB (main PCB board and VCSEL
PCB board).
2. Wave solder the entire assembly in a no-wash solder
process utilizing a solder fixture. The solder fixture is
needed to protect the sensor during the solder pro-
cess. It also sets the correct sensor-to -PCB distance,
as the lead shoulders do not normally rest on the PCB
surface. The fixture should be designed to expose
the sensor leads to solder while shielding the optical
aperture from direct solder contact.
3. Place the lens onto the base plate.
4. Remove the protective kapton tape from the optical
aperture of the sensor. Care must be taken to keep
contaminants from entering the aperture.
5. Insert the PCB assembly over the lens onto the base
plate. The sensor aperture ring should self-align to the
lens. The optical position reference for the PCB is set
by the base plate and lens. Note that the PCB motion
due to button presses must be minimized to maintain
optical alignment.
6. Remove the protective kapton tape from the VCSEL.
7. Insert the VCSEL assembly into the lens.
8. Slide the clip in place until it latches. This locks the
VCSEL and lens together.
9. Tune the laser output power from the VCSEL to meet
the Eye Safe Class I Standard as detailed in the LASER
Power Adjustment Procedure.
10. Install the mouse top case. There must be a feature
in the top case (or other area) to press down onto the
sensor to ensure the sensor and lens are interlocked
to the correct vertical height.
Figure 3. Recommended PCB mechanical cutouts and spacing
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AVAGO [ AVAGO TECHNOLOGIES LIMITED ]
