(Sanitized) ENGINEERING PROPOSAL PROPOSAL NO. 603A ADVANCED LIGHT TABLE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000300010003-6
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 21
• Document Creation Date: December 28, 2016
• Document Release Date: July 2, 2004
• Sequence Number: 3
• Publication Date: April 1, 1967
• Content Type: MISC

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Declass Review by NGA.
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Engineering Proposal
Proposal No. 603A
Advanced Light Table
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TABLE bF CONTENTS
I OPT
INTRODUCTION
PROPOSED- EQUIPMENT
2.1 Weight
2.2 Manufacturing Costs
2.3 Reliability
2.4 Maintenance
2.5 Film Transport Design
2.5.1 Film Capacity
2.5.2 Film Loading
2.5.3 Manual Drive
2.5.4 Motor Drive - Automatic Mode
2.5.5 Automatic-Manual Interlock
2.6 General Illumination
2.6.1 Intensity
2.6.2 Uniformity
2.6.3 Dimming Range
2.6.4 Lamp Color
2.7 viewing Surface
2.8 Shade
2.9 Tilt and Rotation mechanism
2.10 Dimensions
2.11 Film Tensioning
2.12 Film Guide Rollers
2.13 Controls
a) Main Power Switch & pilot Lamp
b) Automatic Film Transport control
c) Brightness control
d) Shade Control
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TAlT,R OF NT R TT",
SE(T" ION
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e) Film Drive Iia-ri,: whael 8
f) Tension Contro1 9
3.0 DEVELOP%IEvr P ?OC) to ;
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1.0 1: ITRODU.'TIOYT
Tie following is a technical descri-ration a f ilmfi
viewing table in accordance with "Desiglti Obj ec'.ive A,~vancec
Light Table Prototype" - 28 February 1)67. T::1e ar>;a used desi:~n
is based upon technology generated through the develo,dmen'_
603 type light table, with considerable emphasis plac:?d upon reduc-
tion of complexity, noise, weight, and ultimate -nano'-ac:_urin c )Sr .
The unit will carry the type number 6)3A.
2.0 PROPOSED EQUIP WT
2.1 Wei ht
The current 603 design weighs over 1.5') pounds and is
therefore, unwiedly to use in certain applicati )ns. The pr
~_~~ged
o03A design will have a target weight of 60 pounds. T) achieve
this, judicious use will be made of sheet metal c instr~ict.ion and
aluminum extrusions. Castings will be of the invest.nenr rnol.d t,'?>e
to eliminate excess metal and extra machining opera: i ),is. A .)re-
liminary weight analysis has shown that sabstantia' wetjht reductio ;s
are possible, however, 75 pounds appears at present t) be a ~noore
realistic figure than the 60 pounds or less requested. We willi.
however, retain 60 pounds as the design g )al.
2.2 Manufacturing Costs
Our initial cost estimates have shown t;`-iatt the curren.
603 will be more costly to manu act.ure in pr_duc.i~n quantities
than is desired.
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On the prop >sed 603A design, cost red?ucti:nn will oo
effectiv~ ~-)y reducing the number o F machining )r)erat i )ns and by an
overall sim li: ication DE the desi xn. It is sagggest. a tar ,,-it ciuantity manufacturing cDs+. be est h'.ished early in the design
phase, so that we may monitor .ir projected manu Fact it Lnc; c )sts
against this figure.
2.3 Reliability
Reduction in the c >mnlexi; - and number ,f c-)nDonents
in the 603A design as compared wit..i the 6)3 will resulr. in a
corresponding enhancement of the reliability. All mechanical
and electrical components will ate )aerated well within their
maximum ratings to insure a high 17F.
2.4 Maintenance
Maintenance of the proposed 6,33A sh- eld be relatively
simple due to the reduction in c mplexity. Referrin: to Figures
2, photographs of the inside )L .'-,e 603, the reader can readit
appreciate the degree of c.mpiexity necessitated }~v the 603 require-
ments. The 603A will hav consi?erab? y fewer c-)-n?oon,-ants an-l etect-
rical connections. Almost all acti.'e ce _ectrDnic c_~mponent.s will ` e
located in the base assembly, where rLhey are readily accessicile.
The film drive motor (s) and the la.ap grid, :).' necessity, are in
the main light box housing, bit arc readily accessit_>' e r or service.
Requirements for mechanical agjus*nents will be vertually eliminatfd
2 . 5 Film Transport Design
2,5.1 Film Capacity
The 603A design will be capablE of viewin?,? Y) fc) )t r )11
of 9 1/2 inch wide film or any s:aller size. This is a c)nsidera.-u
simplification over the two fi l;? requirement the ' .
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2.5.2 F i'_:,i Loading
L>adin. j o7 the film spools on the 6 )3A will hie acc,rn-
plished in the ma.,,ner similar t.-) ;at used on he it i=z
proposed o em )] the sage t-,,,-)e sprinj loaded, 1,cvi(jec
on the 603A similar t) that which was used on the 1 '. This per-
mits bi-directional control oT the _it a motion fro,,,, a sinc;le
control point. The ratio between the handwheel and `-he driven smo
will be nominally fixed at 1:1. A larger crank will ,-)e
supplied on the hand wheel to per:Eit the oi~oerat-jr ~. h)ld the n=a,l;;
in the palm of his hand rather titan only with his firm ertins. !'n
handwheel will be disengaged during automatic node f it n ?..ran:s cur
The power assist mode used on the m03 will no+ be arail.ab . n
the 603A.
2.5.4 Motor Drive - Automatic :Mode
The film transport desi,-, will be re-in~aes . r ated :.~ see
what improvements in performance and, reductin: in C:. may be ac 'Ill
eyed. At present, we have two new systems under c)nsiderati)n. On
system utilizes wound-spring type clutches in c.)njunction wish
DC torque motors and the other employs a single torque mot r and
magnetic particle brakes f-)r tension c)ntral. Eir.ti er sv3t.n has
all the capabilities of the present 603 sy te::i, plus the advantage
of much quieter operation, extended speed range, and c.onsiderab'.v
less complication. The reduction T the modes of :iperatior, rmm
those required on the 603 permits the consideration .f. the alterna-
and improved drive systems. In the motor driven -o or)era t i. ):1 .
the operator will have bi-directional control o:= the film moot ion
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using a single control knob. Film tension will be maintained at all
times and will >e aujustable. The speed range will extend from
less than 1/4 if one inch _g~x.__ v. oer. minute.
This may have to be done in two speed ranges. Duarin! the auto-nati
mode of operation, the handwheel will be declutched r.., prevent
its spinning.
2.5.5 Automatic-Manual Interl.ocx
When the automatic ,-r >wereh drive mode is Mein; employed,
the manual handcrank will be disconnected from the driving mechani:;:;,
to prevent accidental injury to the operator. ,s done aut..)-
matically in one of the drive systems under consi lera+. ion as opeosood
to a manually operating clutch as on the 603. This feature is are
added advantage of the unique wound-s->rindg ty?2e clu-=ch drive sy;teeo
under consideration. In the other system, the handwheel .could ha,,
to be pulled out to be disengaged. An interlock switch would pre-
vent operation of the film drive motors when the h.-en-wheel was en-
gaged.
2.6 General Illumination
The general illum.in-3ti 'n source an-! cantr )l will be the
same as, specified in the referenced design o ajectives 2-2-6?) .
It is interesting to note that the specified dimming circuit, dev-
eloped by an independent company, is almost identical- tt ) that which
we developed for controlling the lamp grids on the 614 an,, r~ 75
designs. That is, the circuit consists of a Zener ii)de ro>ferr?nc-3d
RC ramp generator triggering a unijunction transistor which fires
a silicon controlled rectifier which in turn fires a ^ Triac.
The only major difference in our circuit is that we include a com-
pensating resistor network in the RC timing circuit which makes t?
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control less susceptible output variations due to harmonic distor-
tion of input wave form.
2.6.1 Intensity
2500 foot lamberts goal.
2.6.2 Uniformity
+ 10% over viewing surface.
2.6.3 Dimming Range
Lamp brightness will be continuously variable over a
ten to one intensity range.
2.6.4 Lamp Color
Lamp color may be specified by the customer's technical
representative.
2.7 Viewing Surface
The illuminated viewinc; surface will be large enoujh u~o
accommodate a single Sr 1/2 inch wide X 1!3 inch I:-)n: single frailer.
The surface itself will be of hard smooth g1 as:,.
At present, consideration is being given to the use of
a high strength chemically treated glass (tradename-Chemcor) :aanu-
factured by Corning Glass Works. This glass is available in relati-
vely thin lightweight plate (.090') and its use
for safety glass since when shattered (which could not happen in
normal service) release of internal stresses in the interior of the
glass causes the whole pane to disintegrate into small non-cutting;
granules.
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2.8 Shade
A single shade will be used under the glass viewing
surface, which will be positioned from the back edge of the format
toward the front. A knob with a friction lock on the front if
the instrument will control the position of the shade similar to
that used on the 603. To simplify the design and reduce manu-
facturing costs, a number of di.fferent approaches to the shade have
been considered. One of the most promising appears to be the use
of one of the relatively new stretchable materials such as Duc)ont's
Spandex which may be woven into a opaque fabric or B. F. Goodrich's
PVC rubber. The intention here is to simplify the shade mechanism
by letting the shade retract into a hidden area of= the format
using its own elastic force. The performance or appearance would
be equivalent or better than that found on the 603 design.
2.9 Tilt and Rotation mechanism
The tilt mechanism design will be completely modified t~
eliminate high noise level during operation. Simplified manual
systems will be re-evaluated to reduce noise, weight and manufactur-
ing cost. The overall weight reduction in the viewing table itself
should greatly reduce the complexity of the elevating mechanism.
The manual rotation of the 603, using; teflon coated bearin:
surfaces, appears to be acceptable and will be retained on the 603A.
The limits of tilt will be the same as those on the 603,
i.e., 75 degrees about the short axis and 45 degrees about the long
axis.
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2.10 1) imens ions
The overall size of the instrument will be within that
specified fDr the 603. Reduction in the reuufired format size shoud
permit a small reduction in the death of about.. one inch. Every
effort will be made to reduce the height of 11, inches of the film
viewing surface to the top of the supporting table. The design
goal will be 1J inches. This is possible because of the eliminati)n
of a good portion of the gear iiig .
2.11 Film Tensioning
The tensioning solenoids used on the 603 wrIl be
eliminated, thereby reducing complexity and noise and decreasing the
amount of mechanism above the film plane. Film tensioning will
be accomplished instead by application of a slight drag trarque +:j
the magnetic particle brake for slight reverse motor torque if the two
motor drive is used) even during manual o_.Deration.
2.12 Film Guide Rollers
The film guide r,)1ler.s be highly polished chrome
plated types similar to those used on the 603. They will be of
aluminum rather than brass, to reduce weight.
2.13 Controls
The proposed 503A will ha re the filloo.ing controls on
the front panel:
a) Main Power Switch and Pilot Lamp - These will be
located close to the center Of: the fr,>nit- panel and the power switca7
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will have a distinctive appearance to distinguish it L,-.Dm other
controls.
b) Automatic Film Transport Control -
single knob of larger dimensions than that on tile: 603, located toward
the left side of the panel. There will be a definite detent
position to indicate the null or non-driving position. This one
control will be used to drive fibr., in both directions.
c) Brightness Control - The size and location of the
brightness control potentiometer will be similar to that on the
603. The actual control will be that suggested in the Design
Objectives (2-26-67).
d) Shade Control - Only a single shade control will
be provided. It may be of a thumbwheel type as used on the 603
or it may be a small knob. In either even', its position will be
close to that on the 603. A friction brake