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Re: SV: HMDs

Thor Harald Johansen schrieb:

> > correct me if I'm wrong, but isn't this a similar principle that is used
> > in the private eye ??
> > I know that the PE vibrates, and I thought this was due to a spinning
> > mirror inside ??
>
> I've heard there's a mirror inside, but I don't know if it spins.
>
> It seems that the problem of projecting one horizontal scanline is no
> problem, but at the same time tilt the mirror slightly for each spin is a
> harder nut to crack. The picture would need to be drawn at a pretty high
> rate. What mechanics could be used? I don't think a step motor would react
> fast enough. Maybe some kind of electromagnet moving the mirror or
> something.
> --
> Thor`n
>
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Don't think step motors are too slow! Most common CD drives spin the CD with a
step motor, and they easily go to the physically maximum (you know, the
maximum when the CD gets damaged). However, these motors are very simple. The
one I disassembled (6x speed) used nine coils and the axis attached to a
magnet put over them. I guess, the limiting factor for a self-built model
would rather be the controlling electronics, since they'd have to give a
really high tact.
Unfortunately, these electronics were implemented in the "main board" of the
drive, so I couldn't get them out.

Johannes!

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