7

Figure 7. Cross section of PCB assembly

Design considerations for improving ESD Performance

The flange on the lens has been designed to increase

the creepage and clearance distance for electro-

static discharge. The table below shows typical values

assuming base plate construction per the

PixArt

Imaging supplied IGES file and ADNS-2120-001 trim lens

flange.

For improved ESD performance, the lens flange can be

sealed (i.e. glued) to the base plate. Note that the lens

material is polycarbonate and therefore, cyanoacrylate

based adhesives or other adhesives that may damage the

lens should NOT be used.

Clip

LED

PCB

Sensor

Lens/Light Pipe

Surface

Base Plate

Typical Distance

Millimeters

Creepage

16.0

Clearance

2.1

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PixArt Imaging Inc.

PixArt Imaging Inc.

High-Performance Optical Mouse Sensor