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Re: SV: HMDs

From: Johannes Spielmann <>
Date: Mon, 09 Aug 1999 00:46:07 +0200

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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