Path: utzoo!mnetor!uunet!husc6!bbn!mit-eddie!bloom-beacon!gatech!mcnc!decvax!ucbvax!ucsd!sdcsvax!ucsdhub!hp-sdd!hplabs!sdcrdcf!otto!convex!authorplaceholder
From: ellert@convex.UUCP
Newsgroups: sci.electronics
Subject: Re: HELP with LASRS and GRAPHICS!!!!
Message-ID: <61700002@convex>
Date: 8 Apr 88 20:54:00 GMT
References: <4333@cup.portal.com>
Lines: 29
Nf-ID: #R:cup.portal.com:-433300:convex:61700002:000:1394
Nf-From: convex.UUCP!ellert    Apr  8 15:54:00 1988


I know of two laser surplus dealers that sell various laser related stuff
(power supplies, scanners, mirrors, power meters, etc.  (addresses below).
Both sell General Scanning Z170 scanners for $100 to $200 the pair (probably
used, but in good condition).  These scanners are small (about the volume of
a cigarette pack, but "squattyer") with a shaft extending out of one end.

The rotation of the shaft is slight (~ 10 degrees) requiring fairly long
scanner-to-ceiling distance, the dual coils of low impedance and requiring a
fairly high current signal, and the 3db point is somewhere around 300 Hz or
so (a carefully designed high pass filter may help this some - taking care
not to crisp the windings ...).  There are probably some very troublesome
mechanical resonances in these things as well (maybe a notch filter is in
order here).  But the price isn't too much.

Small, low mass, very thin (~0.1 mm) front surface mirrors are available
from Edmund Scientific (ask for the heavy-duty catalog).  Some sort of low
mass but still adjustable collar (setscrew maybe?)  should probably be used
to mount the mirror to the scanner shaft as opposed to gluing the mirror
directly to the shaft.

Good luck!  Let us know what you find out/how it works out.

Meredith Instruments   POB 1724  Glendale AZ 85311     (a little cheaper)

M. J. Neal Company   6672 Mallard Ct.  Orient  OH  43146


leigh