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From: ron@brl-tgr.ARPA (Ron Natalie <ron>)
Newsgroups: net.audio
Subject: Re: photon stylus from the past
Message-ID: <10220@brl-tgr.ARPA>
Date: Thu, 25-Apr-85 22:42:54 EST
Article-I.D.: brl-tgr.10220
Posted: Thu Apr 25 22:42:54 1985
Date-Received: Sat, 27-Apr-85 05:45:00 EST
References: <797@mhuxt.UUCP> <471@edison.UUCP>
Organization: Ballistic Research Lab
Lines: 13

> From time to time I have wondered on the practicality of using laser beams
> to track a traditional record rather than a contact method stylus.  Not
> knowing that much about lasers or an electronic wizard it never got beyond
> pure speculation.  If it was possible to get enough reflection off the
> record to accurately reproduce the cut signal maybe it would also be
> possible to do a reasonable job of integrating the signal to eliminate
> large excursions caused by pits, scratches, and dust.
> 
And what's interesting, is that the job of avoiding scratches may be
aided by the fact that the laser does not need to read the disk in
real time.

-Ron