Subject:
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RE: Gutting an optical mouse - Part I
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 12 Jul 2002 18:07:32 GMT
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Original-From:
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Rob Limbaugh <rlimbaugh@greenfieldgroup.com!NoMoreSpam!>
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Viewed:
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671 times
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> Still, though, isn't the distance between the sensor and the surface
> dictated by the lens? I don't know much about optics, but I would have
> thought that with the right lens (or perhaps combination of
> lenses), you
> could use the sensor an inch or two above the surface. It
> would just be a
> matter of properly focusing the surface image on the optical sensor,
> wouldn't it? Wouldn't an optical mouse be designed to sense a
> very near
> surface due more the application than an inherent limitation
> in the sensor?
I agree with you in theory. Unfortunately, I don't have resources in optics and
know very little about them (basic physics class stuff).
The failure of my test may simply be related to illumination. How sensitive is
the chip to reflected light? Perhaps the lenses I used would have worked and
were positioned correctly, but scattered the illumination light. Maybe the
position/angle of the illumination source needs to change. Perhaps surrounding
light skewed the sensor's ability to make accurate readings.
I'll try a shroud around the lense of the magnifying glass and place it within
the surface focal point of the optical mouse and see if that works.
Rob
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