Optical System - Sharp SF-7700 Service Manual

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SF–7700
SF–77=
[10] OPTICAL SYSTEM
~. General description
me opti=l system of this @er mneiste of a fix~ f-l distan~
lens and six mirrors.
B-use the lens positionis shiftedrelativeto the mirro~, redu~n
and enlargementis possiblefrom xO.M to xl.% in 91 imrements
of 0.01.
In the SF-~W, the ~ posm wtive'to the mirrorsis clanged
by means of a steppingmotor.me lens is fix@ in the SF-~00 as
it dk not feature variable magnitition.
~ reason six mirrorsare used, is to adjustthe optid path to the
intemd *'anb. ~issystem permitsasmdler internalstrudure.
Exposureis mntrdled elmrontilly by vawing the intensityof the
mpy lamp. ~votige applied to the my lamp is stabilizedto
Q
enh~ uniformexposure.
A dit exposureand moving~ghtsoum is used in mmbination with
a stationaryoriginaltable.
W.2
mirror
Mirror rnotor(SF-~~ on&)
Refl@or Tati g~
, I / /
/
I
I I
m.
,
/
I
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i
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Mirror Wse C
- I*
I
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M.3 mirror Mm -
B ~ _
d
(sF-n50 Ony)
/
B-rge lamp'
10-1
\
1"
Lendmi~r drivemot~
(SF-~W ~ty)
h.5 mirror
.