From: chadwell@utkvx3.utk.edu (Chadwell, Leonard)
Subject: Re: TECH: Problem with HMD
Date: Thu, 15 Oct 1992 14:47:00 GMT
Organization: University of Tennessee Computing Center


In article <1992Oct13.182641.25358@murdoch.acc.Virginia.EDU>, dudley@cebaf4.cebaf.gov (John Dudley) writes...
> 
>I am working on an HMD that uses 2 small LCD televisions, and two
>magnifying-type lenses.  My problem is
>at this time I only want to project the same image to both screens, yet,
>when I do this, the
>image will not come into focus as one.
> 
>What is needed to do this?  Basically, I want to be able to use both
>eyes looking at the same picture.
>I don't necessarily need the stereoscopic effect yet, and WANT to use
>the mini-tv's because of their
>light weight.
> 
>Thanks!

Depending on the focal distance of the lenses, you may be able to focus your
eye on the screen, but not able to converge the images.  If the screens and
focal distance aren't sufficient, it won't work.  You might try increasing the
distance from screen to lens.  Without sophisticated optics, it's about the
only way.  As far as stereoscopic effect, try incorporating the Sega glasses
into the HMD.  With two screens, driven with the glasses strobe, you'll get
stereoscopy if the Sega glasses are between your eyes and the screen.

Leonard Chadwell
CHADWELL@UTKVX.UTK.EDU