Re: [CAD_CAM_EDM_DRO] mouse encoder?

Except for the new optical mice which have a simple imaging sensor and read
the pattern of what ever they are resting on.

I have the MS optical track ball and it has a pattern embedded in the ball.
I suspect the image sensor reads the pattern on the ball and derives
standard mouse signals.

PS I like the MS trackball optical mouse, works everytine and no cleaning
the ball or the wheels inside.

Hugh

----- Original Message -----
From: M. SHABBIR MOGHUL <shabm@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, August 21, 2001 9:42 PM
Subject: Re: [CAD_CAM_EDM_DRO] mouse encoder?


> hi
> u r wrong.
> all mouse have two photo transistor and two led . either infra red or
> normal, for X and Y coordinates.
>
> SHABBIR
>
>
> At 11:21 PM 8/20/01 -0400, you wrote:
> >In a message dated 20-Aug-01 22:17:30 Central Daylight Time,
> >timg@... writes:
> >
> >
> >> Non-optical mice (the type with a ball) use 2 quadrature optical
> encoders to
> >> read the movement. Very low resolution, but certainly an inexpensive
source
> >>
> >
> >OPTICAL? You mean MAGNETIC, no? All the mouse-balls I have seen are
> >plain-black all over (now, don't get nasty!), no "stripes", etc. No
> >photo-transistors. Just Hall-effect sensors.
> >
> >Or, is there some Jordian magic I won't know of in this Century, yet?
> >
> >
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