From the picture it looks a cny70 (Reflective Optical Sensor) which we had lots of useful threads about in the ftforum 1&2.
There is also some info on the ftc, e.g. http://www.ftcommunity.de/categories.php?cat_id=2255
All-In-One Compact Proximity Sensor
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Re: All-In-One Compact Proximity Sensor
"Propaganda does not deceive people; it merely helps them to deceive themselves."
E Hoffer
E Hoffer