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Article #15960

Re: New (to me) laser-beam pickup application

#15960
From: Scott Dorsey
Date: Sun, 03 Jan 1993 22:20
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In article <72811@cup.portal.com> Chris_F_Chiesa@cup.portal.com writes:
>By now we all (hopefully) know that lasers are used to read signals from
>CDs and videodiscs, but last weekend while visiting friends over Christmas
>I heard of a new application for the same (or similar) technology: reading
>good ol' vinyl records by contactless laser pickup.  Has anyone here heard
>of this, and can anyone provide any details on HOW it is being done?  This
>is one of those ideas that, to me, seems obvious in retrospect, and "it's
>a wonder nobody thought of it sooner."

You are thinking of the Finial laser turntable.  It was really a bad idea,
since any little imperfection in the groove wall would show up as a tick
or a pop.  While it did do a very good job of playing back records in 
good shape, it would bring out a lot more surface noise than conventional
playback, and it had great difficulties tracking warped recordings, or
records with an off-center hole.  Finial sold about twenty of the machines
at $15,000 each, before going bankrupt.

There is a small Japanese company which has taken over the design, and is
making the laser turntables on a one-off basis for archivists.  They are
significantly more than $15,000, and except for being able to salvage certain
types of damage, they don't do half as good a job as a conventional pickup.

Save your money and buy a Benz-Micro cartridge and an SME arm instead.
That'll put you back a few thousand bucks less and you might even have
enough left over for a nice turntable.
--scott
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References: <1992Dec30.065648.29072@ole.cdac.com> <72811@cup.portal.com>

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Path: arc1-ca.pugleaf.net!sparky!uunet!news.larc.nasa.gov!grissom.larc.nasa.gov!kludge
From: kludge@grissom.larc.nasa.gov (Scott Dorsey)
Newsgroups: sci.electronics
Subject: Re: New (to me) laser-beam pickup application
Date: 3 Jan 1993 22:20:46 GMT
Organization: NASA Langley Research Center and Reptile Farm
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Message-ID: <1i7oruINNd3r@rave.larc.nasa.gov>
References: <1992Dec30.065648.29072@ole.cdac.com> <72811@cup.portal.com>
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