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RE: HMDs

In playing with some lasers and motored mirrors years ago I ran across a
design you might check into. Instead of one double sided mirror it was an
octagonal (or more I don't remember exactly) wheel with each surface
mirrored. Using something like this might allow you to see 8 or more
"rotations" for each motor rotation. Although you might run into space
limitations.

Brandon Stephens
Intergraph Solutions Center

256 730.5198
800 633.7248
800 603.5500 ext 5198
 -----Original Message-----
From: 	Thor Harald Johansen [mailto:] 
Sent:	Friday, August 06, 1999 10:11 AM
To:	Wearable Hardware
Subject:	HMDs

 << File: hmd.gif >> I've been thinking a bit about that rotating mirror
thing, and I came up
with a drawing (see the attachment). The only problem I see is: Is it
possible to get a small electromotor up to 1500 cycles per second? I've done
some calculations: If the screen resolution is to be 160x120, at a 25 Hz
refreshing rate, you'd need 120 * 25 = 3000 (180000 RPM) rotations a second.
You could half this by having a two-sided mirror, but it would still have to
rotate 1500 times a second (90000 RPM). I guess no motor can do that, so is
it possible to "gear" it up to the proper speed, or is another means of
rotation needed?
--
Thor`n

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