There is a company called Hornix.com.tw that mounts the sensors on little bits of circuit board and then sticks a coverglass on top. (got to hornix.com.tw and click on "Product" and scroll to almost the bottom.
Or you could use a flex and do the same thing.
But what a lot of people do is just sick the sensor on the PCB board and design the housing such that the coverglass is really close to the sensor.
- john
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