Small Stuff: An Optical Mouse Sensor

A few weeks ago I was given a broken Microsoft Wireless Optical Mouse 4000.  When powered on, its LED glowed and appeared to blink and fade as expected, depending on whether or not the mouse sensed motion.  The USB receiver seemed to be working fine as well; Windows detected it and installed the appropriate drivers.  And yet no mouse clicks or motions would register.  So I decided to open it up and take a look.  Long story short: I couldn’t find any obvious problems, but I did snap a few pictures of its optical sensor.  Sadly, I can’t find a datasheet for this particular part.  One document I found called it a Microsoft proprietary sensor.  Oh well.  Here are some nifty pictures taken with a sweet microscope I have access to through work:

Other cool links on the subject:

  • The optical mouse cam (an optical mouse text scanner)
  • An overview of various optical mice and sensors (a bit older, but still cool)
  • More neat pictures of the same sensor (and possibly the same mouse?)
  • A datasheet for the VD5376 optical mouse sensor (comparable, not identical)
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2 Responses to Small Stuff: An Optical Mouse Sensor

  1. Brandon says:

    Wow, awesome pictures! It’s amazing how close you can zoom in with that.

    Do you think each one of those black squares on the left are individual phototransistors?

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