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Re: SV: HMDs

As far as I know, film rolls "spin" quite fast, taking even smaller parts of the
picture, you should get it fast enough.
By the way, you don't need hundreds of complete revolutions per second, you only
hundreds of "same views" per second. Taking a film with 100 pictures, you only
need some revolutions per second.

Chris Hardaker schrieb:

> The flat surface would be easier to manage, however I doubt whether you
> could get anything to loop as quickly as this needs to. We are talking about
> several hundred revolutions per second.
>
> I like the cylinder idea more from the point of view of spinning it a little
> slower and only using say 45 degrees or maybe even 30 degrees representing
> the display field.
>
> ...
> -----Original Message-----
> From: Johannes Spielmann [mailto:]
> Sent: Monday, August 09, 1999 10:46 AM
> To: Charles J Knight
> Cc: ; 
> Subject: Re: SV: HMDs
>
> Charles J Knight schrieb:
>
> > > I would think the cylinder would be better than a tape, since theres
> > > no need
> > > for spooling, etc. Wouldn't the image be distorted though?
> >
> > It would be distorted in the same way as a Trinitron monitor -- flat
> > top to bottom (or right to left) and round in the other direction.
> >
> > A short endless loop would be pretty manageable...not any real
> > problems with spooling.  And, the "flat" surface should help prevent
> > distortion.
> >
> > Imagine one made from audio tape -- it's pretty narrow, so the tape
> > wouldn't have to be terribly long.  There are endless loop micro-
> > cassettes which work very well indeed...build a light source into
> > the center of the microcassette, and put an optical system in front
> > of it.
> >
> > Of course a microcassette tape is probably orders of magnitude too
> > long...just shorten it, which means that less space is necessary,
> > so the case can be made smaller yet.  etc.
> >
>
> As far as I got it, wouldn't be some kind of a film tape better? Maybe some
> sort of 80mm usual standard celluloid film? It would even have fitting parts
> and everything you need, plus the fact that it's easily colorable.
>
> But looks like I got something wrong. You are talking about a normal audio
> cassette? How should that work to produce an almost-square picture?
>
> Johannes
>
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