A PROPOSAL FOR THREE ADVANCED PHOTO-INTERPRETATION LIGHT TABLES

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001400040003-0
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 22
• Document Creation Date: December 28, 2016
• Document Release Date: February 8, 2002
• Sequence Number: 3
• Publication Date: April 24, 1964
• Content Type: MISC

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A PROPOSAL FOR THREE ADVANCED PHOTO-INTERPRETATION
LIGHT TABLES
24 April 1964
Declass Review by NIMA / DoD
STATINTL
STATINTL
TATINTL
(STATINTL
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TABLE OF CONTENTS
INTRODUCTION
C. SPECTRAL QUALITY OF FLUORESCENT LIGHTS
AND HUMAN REACTIONS
AN ADVANCED TILT TOP LIGHT TABLE (Item
A. MECHANICAL CONFIGURATION
B. LIGI-ITING AND ELECTRICAL FEATURES
AN ADVANCED FILM-VIEWING LIGHT TABLE WITH A TRANS-
LATING MICROSCOPE CARRIAGE (Item U)
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A. TRANSLATING MICROSCOPE CARRIAGE
B. MICROSCOPE MOUNTING
C. FINE MICROMETER MOTION
IV. AN ADVANCED FILM-VIEWING LIGHT TABLE WITH A TRANS-
LATING MICROSCOPE CARRIAGE AND HIGH INTENSITY TRACKING
LIGHT SOURCES (Item III)
V. BIOGRAPHICAL SKETCHES
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* Precision oaic,as+s
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lisninntion of ae
capie or flicker eet
but ruU t"We4d design.
,vl po'witive a
ra previously required to handle. various
A superior mechanical fUm drive ?
by
of the film tolaion.
in a - the Mm being traaa erred directly from.
astg of t u+e light
10 s
The prop
each describing the
This disc
eseerp
ties.
which will be common or 0
143s+ee USht "le*. Thus the sections
devoted to the deecr tfoea of the precision microscope
light sources.
described io this prepo
six M , and item
STATINTL 04
STATINTL of
4*
the .light tables. The first
been divided iMa We* sec
an advanced tilt top light table.
, loudi , and illunAsaaa a techniques
wbich lot responsible for the development
saad a mmompus d to
id film proc*ssiAg a , pmeuts as well as
Assists, will be p,
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ADIh JCED TILT TOP
LIGHT TABLE l `Bute na
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U. AN ADVANCED TILT TOP" LIGHT TABLE (ITEM 11
A. MECHANICAL CONFIGURATION
The light table will be of rugged mechanical construction using the
best materials available. It has been determined that the overall size of the
table can be maintained as specified in the technical exhibit and yet permit
the required adjustments to be made. Although weight will be given due
consideration, one design goal will be not to sacrifice ruggedness for a
decrease in weight in any of the members or mechanisms involved. All
tolerances and allowances will two commenarurate with good design practice.
will be decorative and. protective. It is requested that the customer
specify the desired finish. Preliminary layouts have indicated that all
mechanisms required to perform the specified functions can be of basic
"tried and true* design. Ruggedness. reliability, and simplicity of operation
will be cardinal in each design feature of the light table.
1. Overall Size
Preliminary layouts, have disclosed that the specified else of the
ht table can be maintained and yet permfit all necessary adjustments to
made. The external configuration will be no larger than 32" long x 16"
wide x 91' high less film transport mechanism. Handwheels will be recessed
to fit into the light table case.
2. SMol Loading and Holding Mechanism
The spool loading and holding mechanism will be so designed to
accept single spools of 9-1/2". 5""1. and 70mm film or dual rolls of either
5" or 70mm film of 500 foot capacity. The holding mechanism will be design
to operate from one hand crank driving right hand and left hand screws
(see Sketch B). Single rolls of film will be inserted into the holder and
supported on adjustable rollers. By simply turning one crank, the operator
can fit the film spool and take-up spool simultaneously into the film transport
system. To eliminate the need for variouae adapters to drive different film
spools, the spools will be initially centered on axis with a cone shaped pin. and
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MAGNETIC FILM
HOLDING MECHANISM-
SPOOL
HOLDING MECHANISM
11 BLANKING SCREEN
TOP VIEW - ADVANCED LIGHT TABLE
.8ketch - B
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y discs. This method will provide an extremely
rapid film loading system. The film spools will be hold rigidly
during the entire operation of the system; therefore no danger of dropping the
pools will occur at any table elevation. The film spools are released by
simply cracking the crank on the holding mechanism. Center posts will be
provided for handling dual film rolls. These posts will slide into dove-tailed
slots in the track supporting the holding mechanism. Provision will be made
for storage of the center posts with the syletem.
3. Film Transport
The film transport system shall permit bi-directional film motion
controllable from either end. It will permit both winding and unwinding with
one crank located at the right hand side of the light table. The proposed
system will be electromechanical using a scheme of magnetic clutches
actuated from pushbutton switches located on the light table control console.
Both ends (supply and take-up) will be mechanically connected through a
chain drive. Power will be manual (hand control) through a two-speed
transmission to a splined shaft carrying two sprockets to drive the chain.
A magnetic clutch arrangement will be used on the splined shaft to engage
the sprockets as required to obtain the desired film motion. This scheme
will allow the simultaneous transport of both reels or allow each reel to be
d separately in either direction. A small two-speed gear box will
be used to provide a slow mode for rapid transport and a fine control for
viewing. Gear ratios will be changed manually at the transmission. The
transmission will employ anti-backlash Sears. The handwh.el will be balanced
for smooth operation and elimination of drift in the system when the handwheeel
is released and the film is being viewed. Gear ratios will be carefully chosen
to provide optimum transport in the slow mode and to give the operator a fine
control of the film during viewing. A friction brake will be incorporated on
the power output shaft so that the transport ieystem. can be adjusted to the "feel'''
of each operator using the equipment under different load conditions. Inertial
damping will bee used where necessary to provide a smooth drive system.
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4* WIlt ec an sm
04
A tilt mechanism will be provided to allow the table to be tilted 150
to the right or left (see Sketch A). The 15? tilt mechanism will employ tele-
scoping screw jacks driven by a gear and pinion from haandwheels and locked
by a friction device. The jacks will be located at each end of the long axis of
the table. Once the table is tilted and locked, this position will be maintained
no matter how film is shifted and will support a load of 75 pounds without
changing position. The contractor will design the tilt mechanism to be as
rugged as possible. This design will enable the operator to adjust the table
in the right and left (15?) position while the table is in any forward and aft
position (45?) or visa versa.
5. Film Hold-Down Mechanism
To prevent damage to the film during transport, it is desirable to
have the film travel an obstruction-free path from spool to spool. Yet for
proper reading, the film must be placed securely on the viewing surface.
The contractor will accomplish this action 'by using spring loaded hold-down
bars (see Sketch C) actuated by solenoids. A plunger actuated by first motion
of the hand crank (inertial device) will trigger a microswitch which will in
turn close a circuit applying power to solenoids to lift two felt lined bars
used to hold the film flat on the viewing surface. The film will pass freely
between the bars and top surface of the light table during transport. When
motion stops the solenoids will be de-energised allowing spring action to pull
the bars and film tightly against the viewing surface. An electrical over-
ride will be provided to release the bars to facilitate film loading.
b. Light Shades
Light shades will be provided to shield all areas of the lighted sur-
faces not covered by film. The light shades will be roller mounted, spring
loaded and located on the bottom surface of the illuminated viewing area. The
shades will be automatically adjusted to thin a propriate width. by connesctfn the
leadiner edge of the shade to the film holding mechanism (see Sketch By. As the
holding mechanism is moved in or out to accept the required film spool or spools,
the light shades will be automatically adjusted to blank out the unused viewing area.
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TELESCOPING JACK
15 ? TILT I4ECHANISM
Sketch -' A
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MAGNETIC FILM HOLDING MECHANISM -
#L m
. '1
ter, r,
Imo' NO le-A=
- 45? ELEVATION
ADJUSTMENT
FRONT VIEW - ADVANCED LIGHT TABLE
Sketch - C
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f iewin dual s 1s, an insert will be provided to slip into a
cane o v g
in VMS A storage space will be pro-
vided thus blanking out the, area between film.. post, it is anticipated
vided for the insert. By careful design of the center pd l t'
'
ill not excee
distance between any two film strips w.
7. Controls and Accessories
fn addition to the aforementioned controls for manual
dri
tilt adjustment, the unit will contain the following electrical aontrats
a. power switch and indicator lighht
b. Brightness control
c. Film rotation direction controls
d. Hold down bar override switch
ditb to the above controls, SbL l
d
n
In a
actuate d a ~.nte?netess_and in hes. This will alwaysbe
a scale at 0-n.9-and
counters
a
w
of measurement.
tacos zv ww__ be supplied to provide the operator with an index to frame location. The
VW" counters will be driven from the film transport drive chain.
g. Overall Confi uratian
The light table will be of smooth construction using presently accepted
industrial) design standards. All mechanisms and film- ralle _e covered
This design phil?
to present a streamlined arauca and addle, otection.
will interfere with ruggedness
osophy will not be practiced where strear6kining
or ease of operation and maintenance. Placement of controls will be for
optimum operator ease. Human engineering will be given every consideration
in the design of the unit.
B. LIGH'T'ING AND ELECTRICAL FEATURES
The illumination system shall be composed of a cold cathode fluorescent
d AT%
an
construct'
d a diffusing plate. The lamp will be especially
,~, ..,mo encapsulated mount 12-1/211 x 19-1/V x 1-1 /Z ``. The illumination system
shall provide 1800 feet Lamberts maximum light output and. also a dimmer
control to gradually reduce this to 15% of the original value by means of a
quency. solid state power supply.
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Dimmer Control
I
10 KC
Trigger Circuit
IlOv
60 cps
Input
Regulated
Rectifier
Silicon
Controlled
Rectifier
5000 Volt
Auto
Transformer
Figure E. Fluorescent Lamp Dimmer Control Flow Diagram
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Cold
Cathode
Lamp
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e 1amps producing an illumination of 2300 foot lamber
a s
.
~
been utilized in a. photographic film viewer and reported by Howard S. Glick(".
Thus there appears to be no difficulty in meeting or exceeding the illumination
level specified in the technical exhibit,
1. Lamp Typ
A single special cold cathode fluorescent lamp of special configuration
ized. The required brightness level will be obtained by using a single
small diameter (12mm) bulb, folded or spiraled and encatps,]a- trl to prav
a replaceable panel 12-1/2" x 19-1/2" x 1-1/2". The Special lamp will resul
in increased efficiency and more uniform illumination. Standard fluorescent
lamps cannot approach the required brightness simply because of their
geometry. They cannot be arranged to fit the box area.
We propose to procure several lamp configurations and their
associated components to compare their brightness, light uniformity.
dimming control.
2. Dimmer Control
The design shown in the flow diagram in Figure E illustra
electronic control which regulates the amount of current and the time during
which the current will flow through the lamps. The dimming control determines
voltage applied to the silicon controlled rectifiers and adjusts the point
in the cycle at which the tube begins to conduct.
The advantage of utilizing high frequency modulation is that:
a. Stroboscopic effects are eliminated
b. The lamp efficiency is increased about 6%
c. The transformers are 1/2 the size, 1/3 the weight, and
result in 1/5 the beat compared to 60 cps transformers
d. The component hum. frequency can be made beyond the human
audible range. (The audible frequency due to lamination hum
is twice the chosen electrical frequency.)
e. Capacitors can be used instead of ballasts at high frequency.
lick, Howard S., "Inspecting, Photographic Film, " Illuminating Engineerin
January 1964, 59:22-23
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f. A dimmer control can be provided for a range of 100:1 instead
of the 6. 7:1 range requested in the technical exhibit.
Heating
The distribution of energy in a 40-watt fluorescent lamp is approxi-
mately as follows:
60% is converted to ultra-violet energy
38% appears as lamp heat
2% is converted to the visible spe'atrurn in the mercury lines
of 4047 and 4358 angstroms.
Of the 60% which is converted to ultraviolet energy, only about 23.
formed by the fluorescent materials Into visible light. Thus the final distri-
bution of the energy placed into the lamp is:
a. Light 16. 5%
b. Radiated heat 37. 5% (follows the light)
c. Convection and Conduction 46% (dissipated by heating the
surrounding air and conduction to fixture parts)
Using the above approximate factors, the proposed 500 watt lamp will produce
230 watts of convected or conducted heat and 187 watts of radiated heat. The
transformer and electronics will result in another heat loss of about 250 watts.
Thus the overall heating effect will be 2270 BTU/hour at the rate of 3414
BTU/KW hour.
We believe the above heat can be transferred to the case and cooled
ufficiently by convection if ventilation holes are appropriately positioned
along the aides and lower surface of the housing.
4. Flicker and Stroboscopic Effects
Every lamp burned on alternating current has a nonuniform 1
output due to the cyclic variation of the current. However, these variations
are associated primarily with law frequency 60 cycle power. The
iboscopic effect will be virtually eliminated by the use of the proposed
equency supply since the persistence of the phosphor glow or phos-
phorescence will eliminate any noticeable light variations at high frequencies.
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to low starting voltage will not be a problem in the proposed design because
hot cathode lamps probably because of the higher arc voltage. Flicker due
Another method of reducing the variation in light, is to employ two
lamps, one operated with a leading power factor and the second with a lagging
power factor. This is accomplished by adding a series capacitor to one lamp
circuit. Thus the light from one lamp is at maximum, the other will be about
l2iio out of phase. While this is effective in reducing the flicker at at 60 cps, we
do not believe it will be required when a high frequency power supply is utilized.
Flicker can also be caused by failure to start and could be a problem
in dimming controls in which the voltage is reduced to lower the lamp current
or brightness. Cold cathode lamps do not exhibit as much stroboscopic effect
accomplished by adjusting the time duration or period of the
hen the lamp is turned on--not by reducing the starting voltage.
5. Weight and Six*
The weight and size of the high frequency control circuitry will be
substantially reduced compared with 60 cycle transformer and ballast com-
A.s previously mentioned, these, components will be reduced by at
least 1/2 in sist and 1/3 in weight of comparable 60 cycle components.
Since cold cathode lamps have been selected, low voltage cathode
heater transformers are not required. Employment of high frequencies also
makes it possible to utilize capacitors to replace ballasts.
6. Lamp Life
Still another reason for selecting at cold cathode over a hot cathode
fluorescent lamp is that an increase in lamp life is obtained. Then .life of a
lamp Is, lengthened when the burning period per start is Increased. The
lamp life for a hot cathode lamp based on a burning time of 3 hours is 7, 500
hours. The. cold cathode lamps on the other hand have corresponding rated lives
of 12, 500 and 25, 000 hours depending upon the pressure and lamp current.
Their life is not affected by off-on cycling as are hot cathode lamps. However,
light output decreases throughout their life and thus it is usually economical to
replace them prior to actual, failure. One manufacturer of cold cathode lamps
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in cotes their lamps decrease 10% in 100 hours and 10% the following 1 000
hours of operation. Thus for photographic; interpretation it may be advantageous
to replace the lamps at 6 month intervals #or cold cathode lamps and much ror*
frequently in light tables employing hot cathode fluorescent lamps.
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C. SPECTRAL QUALITY OF FLUORESCENT LIGHTS AND HUMAN REACTIONS
s light sources that provide warm, soft illumination as o o d
to cold, harsh illumination are preferred by most people, Such light soursese
generally have least effect on neutral colors.
There is no particular frequency range that ha been proven easier
on th
e eyes than any other. Maximum visibility (i. e.. sensitivity of the
retina) is realized at 5550 angstroms in the greenish yellow part of the
spectrum. Ease of viewing is determined more by such factors as con-
trast, glare, and the nature of the material being `v'iewed by the spectral
quality of the light.
There are two types of contrast which .affect ease of viewing:
1. Contrast between the various portions of the material
being viewed - This should be rn&xirnized if optimum visual
acuity is to be obtained. (Relation reaches asymptote at about
85% contrast.)
2. Contrast between the illumination on the material being
viewed and the ambient illumination - Visual efficiency is
sacrificed when the ambient illumination is less than 1/ 10 as
bright as the material being viewed.
D. OTHER HUMAN ENGINEERING CON: IDERATIONS
1. The users' line-of-siie should ideally be', perpendicular to the
material being viewed. Deviations, of + 450 .are acceptable if the perpen-
dicular criterion cannot be met. rt
2. Information available as a result of anthropometric (the science
of measuring human body dimensions) studies should also be utilized if
equipment is to be designed for optimum human performance. The problem
in designing work areas for human body dirnetnsiona is essentially one in
which efforts should be made to accarnodate as large a portion of the
population of potential users as possible. Proper application of anthro-
n,nrrt i.4r? ge-+s
ill
w
contribute significantly to the solution of this problem.
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III. AN ADVANCED FILM-VIEWING LIGHT TABLE WITH A TRANSLATING
OCROSCO151! CA111101 (Item
The features proposed in the basic light table will be incorporated in
the advanced Film Viewing Light Table with a Translating Microscope
Carriage in addition to the following features:
A. TRANSLATING MICROSCOPE CARRL,GE
The contractor will provide a carriage for translating a stereo micro-
scope or microstereos cope in both X & Y directions over the illuminated
format. The optical center of the microscope shall scan an area of 10" x
35". The carriage will be so designed to permit complete scanning of the
area and shall commerce one-half Inch from the right hand edge of the
illuminated area as defined in the technical exhibit. The carriage motion
shall be smooth, positive, low friction motion which is free of vibration.
The contractor proposes to drive the carriage in both X & Y directions by
use of ball bearing screws and handwheeels. This method will give positive
motion with no vibration. By using this method of carriage transport, a
consistent motion with no position of lesser or greater resistance will be
realized. Friction locking devices will be used to lock the carriage in
X & Y at any position of travel. A design,goal will be to so mount the
carriage and microscope mount to facilitate easy removal and replacement
of the entire assembly from the light table should the operator desire to
use the table simply as a viewing surface. Vee ways will be used to support
the m'croscope in both the X & Y axes thuer giving optimum stability and
precision of motion. The ways will be so designed and of such precision
as to permit less than . 002" of motion at the longest possible lever arm
when a 5 pound force is applied.
B. MICROSCOPE MOUNTING
A rigid mounting bracket will be provided to mount the three micro-
scopes specified in the technical exhibit. Adapters will be equipped with
captive screws for easy removal or installation of any adapter. The
mounting base will be guided by vees circular in construction to per resit
I800 rotation of the base. Spring loading will be used to secure the base
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IV. AN ADVANCED FILM?VIEWING LIGHT TABLE WITH A T`RANSLAT tG
d
__ MM Awff .1 -
S teem
In addition to the features proposed in the Advanced Film Viewing Light
Table with a Translating Microscope Carriage. the contractor will supply
two high intensity collimated light sources. The light sources and a lens
Systetm will provide a collimated beam of high intensity light that will be
directed to a 450 reflecting surface that is located beneath the viewing
surface and above the general illumination surface. The light beams will
then be focused on the objectives of the stereorrsicroecope. The light
sources and lens systems will be packaged in one unit and mounted ex-
ternal to the light table proper to eliminate the cooling problem. The
light sources will be connected by a mechanical linkage to the micro-
scope carriage for transport along the X & Y axes of the light table. 1 iflr-
rors will be connected by a system of belts and pullies to the microscope
transport. Motion imparted to the microscope carriage will translate the
mirrors and light sources in synchronism with the microscope.
A. INDEPENDENT ADJUSTMENT CONTROL
Mechanical adjustments will be provided to allow independent positioning
and alignment of each light source and mirror. This adjustment will be
external to the light table proper and so located to provide adjustment with
ease. A lock mechanism will be provided to lock the reflectors in syn-
chronism with the microscope carriage. The reflectors will be so;:mounted
that they can be positioned on the separate objectives of a microscope or be-
neath the single objective of a stereomicroscope. By using mirrors, a
separation of 50mm from center can be maintained. The light sources and
reflectors will track through the total scan rungs of 10=+ x 35".
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guide block.
C. ] 'INZ MICROMETER MOTION
The microscope mounting plate will be so designed to allow for + Zcm
of micrometer adjustment in the X t, Y directions. This motion shall be a
precision auxiliary motion accomplished after the main translational carri-
ages have been locked in position. Micrometers will be selected to pro-
duce the most accurate adjustment with the least reading effort required.
STATINTL The contractor is propooing a
mount and vernier adjustment system, or equiv
specified, in the technical exhibit.
to moot the accuracies
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