Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!henry From: henry@utzoo.UUCP (Henry Spencer) Newsgroups: sci.electronics Subject: Re: Heads up display for a motorcycle helmet Message-ID: <7726@utzoo.UUCP> Date: Mon, 2-Mar-87 17:26:00 EST Article-I.D.: utzoo.7726 Posted: Mon Mar 2 17:26:00 1987 Date-Received: Mon, 2-Mar-87 17:26:00 EST References: <3610001@hpfcpp.HP.COM>, <492@oucs.cs.OHIOU.EDU> Organization: U of Toronto Zoology Lines: 16 > > Wouldn't it be just as distracting changing focus from about 4 cm. > > (face shield ) to tens of meters ( road conditions ) as it would be to > > look down at your tank bag? > > Why have to look 4 cm from your eyes? It should be possible to have the > display appear to be about 20 meters in front of you, although the type > would have to be large... The optics in aircraft head-up displays are normally set up to make the image appear to be at infinity, in fact. (There is very little difference in eye focus between 20 m and infinity.) Presumably any similar device for a motorcycle would function the same way. Avoiding refocussing of the eyes is just as important as avoiding the need to look down. -- "We must choose: the stars or Henry Spencer @ U of Toronto Zoology the dust. Which shall it be?" {allegra,ihnp4,decvax,pyramid}!utzoo!henry