Greetings,
    I don't think there's a laser in the mouse, it's just a super bright red
LED

cheers,
Tan



----- Original Message -----
From: "Silvio" <dabest@IG.COM.BR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, October 05, 2001 9:40 AM
Subject: Re: [EE]: Optical mouse technology


> Are you right they are laser?
> I've seen some people that put blue led's replacing the red ones, and they
> work.
> Not to mention the nice appearance...
>
>
>
> "Peter L. Peres" wrote:
>
> > > How does it work ? It seems to have a laser diode and a photo sensor,
> > > but how is it able to respond to movements in every direction ?
> >
> > It makes a speckle pattern on the target with the laser (whose beam
> > interferes with itself at the irregularities in the surface) and a small
> > CCD camera looks at the pattern and determines if it moved and in what
> > direction. There are other ways to sense this, but they all rely on the
> > speckle pattern afaik.
> >
> > Peter
> >
> > --
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>

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