Figure 102 Effects of dust on optical path
If large dust particles get trapped on top of the lens surface in the cavity between camera window and lens,
they will cause image blurring and poor contrast. The dust gasket between the window and lens should
prevent any particles from getting into the cavity after the manufacturing phase. Dust in this position should
be blown away by using compressed air.
Unauthorized disassembling of the product can also be the root of the problem. However, in most cases it
should be possible to remove the particle(s) by using clean compressed air. Never wipe the lens surface before
trying compressed air; the possibility of damaging the lens is substantial. Always check the image sharpness
after removing dust.
Testing camera image sharpness
Symptoms and diagnosis
If pictures taken with a device are claimed to be blurry, there are six possible sources for the problem:
1 The protection window is fingerprinted, soiled, dirty, visibly scratched or broken.
2 The photographed object is too close – the camera lens operates with distances from 20 cm to infinity.
This is no cause to replace camera module.
3 User has tried to take pictures in too dark conditions, and images are blurred due to handshake or
movement. This is no cause to replace camera module.
4 There is dirt between the protection window and camera lens.
RM-340; RM-341
Camera Module Troubleshooting
Page 5 –14 COMPANY CONFIDENTIAL Issue 1
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