HANDBOOK FOR DIRECT IMAGE VIEWER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A001100010007-2
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 35
• Document Creation Date: December 28, 2016
• Document Release Date: April 11, 2001
• Sequence Number: 7
• Content Type: BOOK

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HANDBOOK
FOR
DIRECT IMAGE VIEWER
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 [. l t ! l ! t t
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U MAGNIFICATION, DIRECT IMA~;E VIEWER
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TABLE OF CONTENTS
Page
A. Performance Characteristics . . . . . . . . . . . 1
. 3
B. Description . . . . . . . . . . . . . .
1. General Theory of Operation . . . . . . . . . 3
2. Description of Machine . . . . . . . . . . . 3
I. PERFORMANCE CHARACTERISTICS AND DESCRIPTION .
II. OPERATION . . . . . . . . . . . . . . . . . ? ' .
7
A. Preparation for Operation . . . . . . . . . . .
B. Loading the Viewer . . . . . . . . . . . . . . 7
C. Basic operation . . . . . . . . . . . . . .
1. Operator Position . . . . . . . . . . . . . 8
2. Operational Procedure . . . . . . . . . . . . 8
3. Safety Features . . . . . . . . . . . . . . . 10
? 11
III. SERVICE INSTRUCTIONS . . . . . . . . . . . . . .
A. Lamp Replacement . . . . . . . . . . . . . . . . 11
, 11
B. Filter Replacement . . . . . . . . . . . . .
C. Inspection, Adjustment ' . . . . . . 12
D. Optical Component Cleaning . . . . . . . . . . . 12
14
E. Electrical circuits . . . . . . . . . . . . .
1. General . . . . . . . . . . . . . . . . . . . 15
2. Illumination . . . . . . . . . . . . . . 15
3. X-Y Translation . . . . . . . . . . . . . . . 16
4. Magnification Translation . . . . . . . . . . 17
5. Lamp Thermostats . . . . . . . . . . . . . . 18
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LIST OF ILLUSTRATIONS
Page
Figure 1.
Dual Magnification, Direct Image Viewer
i
Figure 2.
Optical Plan, Direct Image Viewer
19
Figure 3.
Figure 4.
Figure 5.
Field Lens Assembly
Rear Section of Viewer
Illumination and Objective Lens Assembly
5X Position
22
Figure 6.
Objective Lens Assembly - 50X Position
23
Figure 7.
Condenser Illumination Assembly
24
Figure 8.
Viewer, Rear View - Lamp Housings
25
Figure 9.
Figure 10.
Bottom View, Translation and Lamp Fan
Assemblies
Bottom View, Translation and Focusing
Cam Assemblies
27
Figure 11.
Electrical Control Chassis
28
Figure 12.
Loading Film Holder
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I. PERFORMANCE CHARACTERISTICS AND DESCRIPTION
A. Performance Characteristics
The Direct Image Diffraction Viewer (Figure 1) employs a
unique approach to high resolution rear projection viewing of
photographic films. Diffraction gratings and a large field lens
are used to provide an observer with an enlarged aerial image
which can be viewed simultaneously with both eyes.
The various characteristics of this viewer are listed below.
1) Magnification - dual magnifications of 5X and 50X.
2) Observable Film Area - the observable film area
consists of a two (2) inch by two (2) inch square area in the
film plane at 5X magnification, and two-tenths inch by two-tenths
inch square area in the film plane at 50X magnification.
3) Film Size - the viewer accepts for viewing single
frames of either 4 x 5 inch or 70mm x 100mm film chips.
4) Exit Pupil Size - the size of the composite exit
pupil is at least 3.5 inches square.
5) System Resolution - at 5X magnification, the viewer
is capable of providing a system AWAR resolution of 20 lines
per millimeter over the used field when referred to a low
contrast target in the object plane. At 50X magnification, the
viewer is capable of providing an on-axis resolution of 200 lines
per millimeter at the film plane with a low contrast target.
6) Light Intensity - the illumination system is variable
and presents to the eye, with an open film gate, that amount
of light flux as presented to.the eye by a lambertian source
with illuminance of 100 ft-lamberts,
7) Illumination Spectrum - the illumination of the viewer
system is contained in a narrow portion of the spectrum centered
around 508.6 millimicrons, Various filters may be used to
provide different band passes.
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8) Film Positioning - the viewer incorporates a pro-
vision for remote film positioning through X and Y translations
to permit full coverage viewing areas for either 70mm and 5 inch
film chips.
9) Focusing - manual fine focusing control is provided
for each magnification.
10) Film Temperature - the temperature of film when
mounted in the film plane of the viewer during operation does
not exceed 90?F with an average density (silver) of O.B.
11) Viewer Controls - the control panel contains the
following:
a) main power - ON/OFF
b) lamp ON/OFF
c) illumination intensity control
d) magnification selector - 5X and 50X
e) lens focus - 5X and 50X
f) film translation +2 inch X
12) Physical Size - the viewer has the following general
dimensions:
length - 81 inches
height - 23 inches
width - 29 inches
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B. Description
1. General Theory of Operation
In direct viewing optical instruments, such as a microscope,
the exit pupil is small, requiring that the operator place his
eye close to the eye piece for satisfactory viewing. The
present Experimental Direct Image Viewer, with its large optical
elements and diffraction grating, enlarges the exit pupil in a
manner that the operator may view with both eyes the image and
still have adequate head movement. In the absence of employing
diffraction gratings in the present viewer, a single small
exit pupil would exist, which would restrict the operator to the
use of a single eye and no head movement when viewing at high
magnifications. Through the insertion of the gratings in the
optical path, and the use of a narrow portion of the spectrum,
many exit pupils are created, which when arranged side by side
and placed both above and below one another, form a matrix of
exit pupils in space providing an effective viewing area of 3.5
inches square, where the operator may place his eyes for viewing.
This unique approach results from the use of a special field lens,
and specially designed and built set of diffraction gratings.
Narrow band spectrum must be used in the viewer, or the diffraction
characteristics of the gratings will produce various colored
matrix exit pupils.
2. Description of Machine
a. X-Y Translation Mechanism
Both the 4 x 5 and 70mm film areas are held flat by two
interchangeable platens, each with a vacuum manifold which
operates over the entire film area. This form of film hold down
provides an accurate flat film plane with no air entrapment.
The interchangeable film platens are removed from the machine
for easy loading and can be re-inserted in the Y slide shown in
Figure 5. The Y slide is then driven over a total distance
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of four inches (+2 inches) by a ball screw and nut. The yoke,
which supports the Y slide and Y drive motor, slides on the
large ball bushings and rails for the X movement and translates
for the required magnification change.
A long ball screw and nut is used to perform this operation.
This dual function is provided by the drive package shown in
Figure 10. The smaller gear motor drives the yoke back and
forth in X for the required +2 inches. When a change in
magnification is made, the duplex clutch connects the higher
speed motor to the ball screw and translates the yoke 9 inches from
one optical axis to the other, so that the same area of film is
being viewed at either magnification. This movement is accomplished
by the gear reduction and cam actuated microswitches. The gear
reduction is chosen to insure that the travel of the cam from one
microswitch to the other provides the 9 inch travel between
magnifications.
The yoke is supported both above and below the film chip
to insure the film is maintained in the image plane of the lenses.
This operation is critical since the 50X lens has a very small
depth of focus when operating at F/1 and above a resolution level
of 200 1/mm. Although the viewer has the ability to permit
viewer focusing of the lenses at the different magnifications,
the rigid platen mechanism eliminates the necessity for performing
frequent viewer focusing operations.
b. Light Source and Condensers
Two 1500 watt lamps are used to provide the required
illumination, Figure 7. For this experimental viewer a
continuous spectrum source was selected so that various wave-
lengths could be tested. These 1500 watt projection lamps are
mounted in a housing through which air at a velocity of
approximately 1500 ft/min. is passed. This air is provided by
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two vane axial blowers, see Figures 8 and 9. The air is
ducted through the rear of the machine. A heat transmitting
reflector is mounted on the rear side of the ducting. A tube
connects the front of the ducting to the condenser elements,
see Figure 5. The front element has a reflective coating for
IR radiation. These condensers contain heat reflecting mirrors
to remove any heat that passed through the first condenser lens.
The light then passes through the colored interference filters
and the remaining condenser lenses.
c. Objective Lens Assembly
Two commercial lenses are used to provide the 50X and 5X
images. These lenses are modified to contain square apertures
with apparent side dimensions of .707 inches, This dimension
is adjustable (?10%) by the use of the standard focusing ring.
The 50X lens has a 1 inch focal length and is used at an
aperture equivalent to f/l. The 5X lens has a 210mm focal
length and is used with an aperture of approximately f/8. Each
lens is mounted on an "h" shaped mount which is spring loaded
against a tapered shaft driven by a cam through a worm gear
from the focus knob. This arrangement places all the mechanisms
under the mounting table and provides a fine, smooth operation.
One full turn of the 50X focus knob will move the lens 0.002 inches.
With the greater depth of focus of the 5X lens, this is adjusted
to provide 0.006 inches per knob revolution. A total travel
of 1/8 inch is provided for each lens. This mechanism is
shown in Figures 6 and 10.
Two mirrors are used to deflect the optical path from 50X
to 5X, shown in Figures 5 and 6. The movable mirror is mounted
on a slide which is driven by a motor and crankshaft. The gear
head output of the motor operates in 1800 intervals, controlled
by a microswitch and cam, to slide the mirror to the forward
(5X) or rear position out of the 50X optical path.
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A field flattener is used in each optical path to compen-
sate for the slight curvature introduced to the image plane by
the field lens preceding the diffraction grating.
d. Field Lens and Grating
A 16" diameter field lens is used to image the square
aperture of the objective lenses in front of the viewer as an
exit pupil.
The field lens is made up of two parts with the grating
mounted between them. The light bundle falling on the grating
must be parallel from any point on the objective. This requires
that the focal point of the first element fall at the exit pupil
of the objective lens. The parallel bundles go through the
grating and are imaged at the next. two elements focal point
which is 20 inches, The first element preceding the grating
is operating at f/3, whereas the outer two elements provide an
f/1.3 cone.
The grating between the lenses is operating on the
Fraunhofer diffraction principle. A two dimensional array of
exit pupils is created by the grating. The diffraction must
occur with reasonably uniform transmission over +13 orders to pro-
vide the 3.5 inch exit pupil matrix.
The field lens with grating installed is shown in Figure 3.
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II. OPERATION
A. Preparation for Operation
variable
The viewer should be placed in a room
the luminance
intensity illumination.
For best operator of the surroundings should be less than 5 foot-lamberts.
The rear panel of the viewer should be at least 12 inches
from any vertical partition or wall to provide adequate air flow
for cooling of the projection lamps.
The electrical circuit for the viewer should be fused for
a minimum of twenty amps.
The vacuum pump can be mounted anywhere near the viewer
rear panel. The pump is electrically connected to the outlet
on the rear panel. This will allow pump operation via the main
power switch on the viewer control panel.
The vacuum hose is pushed over the serrated fitting at the
back of the viewer. The viewer is now ready for operation.
film chips, a work
For ease in loading and unloading
surface should be placed near the viewer for storing film and
working with the film chip holders.
Loading the Viewer
B.
Two film chip holders are provided. The two sizes
film
accommodated are 4 x 5 sheetsthand ese 70chix p lho holders in the same
sections. Film is loaded in
manner as in standard cut film holders.
The film is inserted in the holder upside down and
as shown in Figure 12. After the film is in the
emulsion up,
holder, check to see that the back edge is under the chip
holder lip.
The film chip holders are inserted into the viewer through
This door is
the small hinged door on the top of the housing.
o ened by a slight pull on the knob which disengages the catch.
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NOTE: The viewer must be loaded and unloaded in the
5X position.
With the 5X position as noted above, the chip holder is
inserted in the viewer slide with film toward the front of the
viewer. As the holder is inserted, a vacuum seal is made by the
spring clips pushing the chip holder to the vacuum input side
of the Y slide. As this is done a change in sound of the vacuum
pump will be noted if it is running. The vacuum pump is activated
by the main power switch. The vacuum withdraws the air from
between the film and the glass plate to provide a flat film
plane. With the film inserted and the door closed, viewing
may begin.
C. Basic Operation
1. Operator Position
The operator should sit with his eyes about 12 inches in
front of the front panel. Head movement is possible, both
forward (toward the viewer) and backward. The fore and aft
movement may be a few inches and still maintain sufficient
exit pupil relationship for proper viewing. Side to side and
up and down movement of plus or minus an inch is within the
usable exit pupil array. More movement than this is possible
with some intensity fall-off for the outboard eye.
2. Operational Procedure
First depress the main power switch (the vacuum pump and
fans will start). Then depress the illumination power switch.
Adjust the intensity by rotating the control knob to increase
or decrease the target brightness. This control knob will
allow complete control of the brightness level.
At 5X, a 2 x 2 inch square area is observed. The film is
moved by the viewing window by the lower buttons appropriately
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arranged. The film is moved behind this window while any of
the four switches are depressed; release of the switch stops.
the movement. The scanning rate is one inch every three
seconds.
Manual fine focus is provided by the two knobs under the
viewing window. For each revolution of the 5X knob the lens
will move 0.006 inches.
When an area has been selected for examination at 50X, this
area should be positioned in the center of the format by the X-Y
translation controls. Once this has been accomplished the 50X
magnification button is momentarily depressed. This causes the
yoke to move the film to the other optical path. The viewer
requires about three secs. to change magnifications. During
this time the exit pupil will be dim. After the translation
has been accomplished the corresponding lamp will be switched
from a dim standby condition to the brightness level set.
The brightness setting at the 5X position is transferred
to the 50X optical train and lamp. Any change made to the 50X
lamp will likewise be transferred back to the 5X lamp when the
change is made.
The fine focus knob to the left controls the 50X lens
with one revolution moving the lens 0.002 inches.
Because of the small viewing area at 50X (.2 x .2 inch) and
the fixed translation rate, it is felt that the most desirable
method of operation is to select and position an area at 5X,
the switch to 50X for analysis. When the next area is to be
analyzed, return to the 5X position and translate the film in
X-Y to the next area.
When this new area has been centered, switch back to 50X
for analysis and so on. Small translations seem reasonable
to make at 50X, but for large changes in X and Y it is worth-
while to wait the few seconds for the magnification change and
return to 5X where a much larger area is available for viewing.
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3. Safety Features
There are six limit switches on the translation mechanism.
If an operator runs the X and Y movements too far the drive
motors will be shut off before any mechanical interference
occurs. The opposite X or Y control should be operated to
return the film chip to the optical path.
Another safety feature is provided in the lamp cooling
system. If for any reason a fan stops and the lamp housing heats
up, the lamp will be shut off. This is performed by a thermostat
mounted on the housing which senses the temperature and is
adjusted to shut off the fan when a 15-200 temperature rise occurs.
NOTE: If a lamp goes out during an operation, verify
that the fan is still running before changing
the bulb.
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III. SERVICE INSTRUCTIONS
A. Lamp Replacement
The black louvered panel on the top of the machine is
removed to gain access to the lamps. This panel is removed
by a light pull on each of the four knobs.
After the panel is set aside the housing top must be
removed. Four quarter turn wing head fasteners are released
on the housing cover with the burned out lamp. With this cover
removed the lamp may be pulled straight up for removal.
CAUTION: Wait until bulb cools before removal.
Two 7/16
Pull straight up - do not twist.
diameter metal pins protrude from the bottom of
the 1500 watt DTS
These collars both
electrical power.
housing cover, and
lamp and fit into spring loaded brass collars.
support the bulb as well as supply it with
After the new bulb is inserted, replace the
remember to latch this cover as the air from
it off if it is not fastened. Then replace
with the louvers deflecting the light and
air toward the rear of the viewer.
the fan could blow
the louvered panel
B. Filter Replacement
By removal of the louver panel mentioned in the section
above, the operator may reach the rear slot in each condenser
housing. These slots contain the removable colored filters.
A variety of colored filters may be inserted into this opening
for testing and analysis. The filters must be 4" in diameter
for the 5X condenser and 2-3/4" for the 50X condenser. Both
filters should be 1/4 inch thick.
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C. Inspection, Adjustment
The interior of the viewer is accessible after removal of
the outer housing. The housing is best removed by two people
after the 14 screws which hold it down are removed. With the
housing removed all portions of. the machine,-except the drive
package for the X translation, are easily accessible.
upporthfloor.
support
translation drive is mounted under the condenser
If adjustment of the distance traveled between magnification is
required, the backplate must be removed. With the removed the two microswitches S5 and S6 (Figure 9) may be
adjusted.
Slight image displacements at 5X may be made by adjusting
With the mirror in the
the screw on the side shown in Figure 7.
forward position the stop screw is adjusted until the mirror is
verify that the
aligned. Before attempting this adjustment,
yoke moves the correct amount (8.865 inches) between the magnifi-
cations. This is accomplished by the microswitch mentioned
D. Optical Component Cleani
It is recommended that any of the optic assemblies in the
system be returned to the manufacturer in the evehtinternal
optic surfaces require cleaning. The assembly procedures
require special tools to avoid any damage to the precision optic
surfaces.
The external optic surfaces of the assemblies may be
cleaned, if necessary, by following the procedures recommended
below. However, these recommended procedures will not guarantee
that the lens surfaces will not be damaged.
1. Uncoated Glass Surfaces - Uncoated glass surfaces
are found on the end of both condenser assemblies
nearest the film plane, and on the filter
assemblies inserted into both condenser assemblies.
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Loose Particles and Dust - Loose particles and
dust may be removed by gently brushing the
surface with a soft camel's hair brush. This
brush should be free from dust and oil (including
oil from the hand).
Films - A film, such as many accumulate on a
surface exposed to tobacco smoke or oil fU ATINTL
may be removed by first soaking the surface with
MIR-Q-Lens
or acetone. Then gently wipe
the surface dry with clean lens tissue or clean
cotton balls. Any lint remaining then may be
brushed from the surface with a camel hair brush.
2. Magnesium Fluoride Coated Glass - Magnesium
fluoride coated surfaces are on all surfaces of
the field less assembly, all surfaces of both
objective lens, and all surfaces of both field
flatterers.
Loose Particles and Dust - same as uncoated glass.
Films - same as uncoated glass.
3. Mirror Surfaces - Aluminized and Silicon Monoxide
Overcoated - Aluminized and silicon monoxide
overcoated mirror surfaces are found on the 2-path
deflecting mirrors used on each side of the 5X
objective lens.
Loose Particles and Dust - same as uncoated glass.
Films - same as uncoated glass.
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4. Multilayer Coating (dicroic filters)- Multilayer
coatings are used on the concave mirror surfaces
behind both light sources, on the condenser
surfaces nearest the lamps, and on the diagonal
reflectors within the condenser assemblies.
WARNING - These coatings are very soft and quite
easily damaged. The use of EXTREME care WILL NOT
insure that the surface will not be damaged.
Loose Particles and Dust-- same as uncoated glass.
Films - It is extremely difficult to clean a film
deposit from a multilayer coated optical surface.
First, it is quite deceiving as to whether or not
a film is actually on the surface as some multi-
layer coatings have a grayish, or cloudy, appearance
under certain viewing conditions. Second, these
coatings are quite soft and hence, easily damaged.
Even under the best of conditions, using trained
optical personnel, about 1 surface in 10 will be
scratched during cleaning.
If it is absolutely necessary to clean a film from
a multilayer coated surface, first soak thTATINTL
surface with MIR-O-Lens
or acetone. Then
gently wipe the surface dry with clean lens tissue
or clean cotton balls. Remove any lint remaining
with a clean camel hair brush.
E. Electrical Circuits
Refer to the Electrical Schematic (Figure 13) for all
call outs discussed in this section.
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1. General
The POWER Switch on the front panel controls the Direct
Image Viewer. The indicator lamps on this switch illuminate
when AC power has been applied to the console. When the POWER
switch is depressed, relay K1 is energized and provides power
to the drive circuits and to the blowers Bl and B2, which are
used to cool the projector lamps. Relay K1 routes 115V, 60 cycle
power to the connector J2 which is provided for operation of
external equipment. A total of 750 watts may be connected to
this outlet. Fuse Fl provides protection for the Direct Image
Viewer and any equipment connected to J2. After the POWER
Switch has been depressed, the panel controls may be used to
position the film chip frame assembly for loading.
2. Illumination
Illumination of the viewing area is provided by means of
projector lamps DS9 and DS10. Depressing the LAMP Switch S2
energizes relays K2 and K7. Relay K2 applies power to the
projector lamps DS9 and DS10. initially, a low voltage is
applied to both lamps to allow them to warm up. Approximately
a second later relay K7 energizes and allows either relay K3
or K4 to become energized depending on which magnification
selection switch has been depressed. Voltage from the illumina-
tion control circuit is applied to the lamp used with the
magnification selected. Low voltage is applied to the projection
lamps prior to the application of the higher viewing voltage
to reduce the current surge which would tend to shorten the life
of these lamps. Once the lamps are turned on, power is maintained
on both lamps to keep their filaments warm and allow switching
from one lamp to the other as magnifications are changed. Keep-
ing the filaments warm also increases the life of these lamps.
The light output of the lamp in use is controlled by the light
intensity control RI - R2 on the control panel. These rheostats
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adjust the firing time of a pair of silicon controlled rectifiers
CR1 and CR4 to vary the voltage applied to the projector lamp.
3. X-Y Translation
Since the entire slide chip in the viewing frame cannot be
viewed at once, controls are provided on the front panel to move
the slide chips both in the horizontal (X) and vertical (Y)
directions. The slide chip may be moved horizontally to the
right by depressing the RIGHT switch S13 on the control panel.
Depressing switch S13 applies power to motor B5 and clutch L1,
causing the slide chip being viewed to move to the right.
Depressing the LEFT switch S12 also powers motor B5 and clutch
Li but reverses the direction of motor B5 and moves the slide chip
to the left. These switches are of the momentary type and must
be held depressed to move the slide chip. Similarly, the UP
switch S14 drives motor B6 and moves the slide chip up while the
DOWN switch S15 reverses motor B6 and moves the slide chip down.
To prevent driving the Y-slide assembly against the stops either
in the vertical or horizontal direction safety switches are
provided. Limit switches SB and S9 are connected in series
with S14 and S15, respectively, to open these circuits and
prevent damage to the Y-slide assembly and drive. Limit switches
510, Sll, S19 and S20 are connected in series with the horizontal
movement switches S12 and 513, respectively, to limit travel of
the yoke assembly. Thus, if any of the X-Y coordinate switches
are depressed sufficiently long to drive either the Y-slide or
yoke assembly to the limits of its travel, it will actuate a
limit switch and stop. It may then be returned towards center
by depressing the opposite panel switch.
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4. Magnification Translation
Magnification change is accomplished by depressing the 5X
or 50X magnification switches. If it is desired to use the 50X
magnification, the 50X magnification switch S3 is momentarily
depressed. Switch S3 energizes relays K8 and K5. Relay K8
latches on its own contacts and provides power to motor B3 which
drives the yoke assembly from the 5X position to the 50X
position. The traversing mechanism is mechanically coupled to
a counter gear which has cams to actuate switches S5 and S6.
Since relay K9 gets its latching voltage through the contacts
of switch S5, when this switch is actuated by the mechanical
counter gear cam, it is opened and relay K6 is energized,
stopping motor B3 and, the yoke assembly. Relay K6 remains
energized as long as the yoke assembly is in the 50X position.
During this time, relay K5 is also latched on its own contacts
and through switch S7 applies power to the mirror motor B4.
Motor B4 moves the mirror in or out of the lens system as
required. The mirror motor rotates a cam wheel which, when it
has completed half of a revolution, opens switch S7, de-energizing
relay K5 and stopping motor B4. Similarly, to move to the 5X
position, the 5X switch S4 is momentarily depressed. Depressing
switch S3 energizes relays K9 and K5, Relay K9 supplies power
to the traversing motor B3 and, it runs until the counter gear
cam actuates switch S6. Actuation of switch S6 de-energizes
relay K9 and relay K6 which brakes motor B3 as it stops. The
mirror motor B4 again drives the cam wheel. When the cam wheel
has completed 1800 of rotation, it now actuates switch S21
opening it, and de-energizing relay K5 which stops motor B4.
During the time a magnification change is occurring, the
projection lamps are dimmed. Both relays K8 and K9 energize
relay K10, which in turn de-energizes relay K7. Relay K7
de-energizes both relays K3 and K4, putting low voltage on the
lamps. When the yoke assembly completes its travel, relays K8,
K9 and K10 are de-energized allowing relay K7 and either relay
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
 Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
K3 or K4 to energize, depending on whether switch S5 or S6 is
actuated. The lamp at the magnification selected then returns
to full brilliance.
5. Lam Thermostats
Thermostats S16 and S17 are installed on the lamp housings
T . breaking from over-
heating. prevent possible damage due to a lamp
heating. If sufficient air does not flow past the lamps to
preset
maintain the housing temperatures below that of the pde-energizing the
thermostats, the thermostats will open,
is then applied to the
associated relay K3 or K4. Low voltage
lamps until the condition is corrected.
au Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
 kpproAd Forkelease 20017/17 :CIA-RDP78B 4747A 01100010007 2
OPTICAL PLAN
DIRECT IMAGE VIEWER
GRATING INSERTED BETWEEN
LENS SECTIONS
I REFLECTED I.R.
150OW
LAMP
REFLECTOR
TRANSMITTED I.R.
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
FIGURE 2
 Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
Field lens, front section, doublet
lens rear section, single element
30 Diffraction grating and support
Q Viewing window
ON
Approved For Release 2001/07/17: CIA-RDP78B04747A001100010007-2
Figure 3.
 Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
(D L_iyht i)ait'e
2O Electrical control chassis
Thermostat, lamp safety switch
Removable covers, for lamp replacement
Approved For Release 2001/07/17 : CIA-RDP04747A001100010007-2
Figure 4.
 Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
5X POSITION
Q Terminal Board #8
Q 4 x 5 Film Chip Holder
3Q 50X Condensor
5X Condensor
5Q 50X Field Flattener
6Q 5X Field Flattener
Approved For Rele` se 200 1F0~l?1 ' SCI deD j ~j~I4 'A%Oj~&6bj06den)
-22-
Figure
 Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
OBJECTIVE LENS ASSEMBLY
50X POSITION
50X Lens
5X Lens
Movable
? Mirror
Mirror for 5X Magnification
Motor Assembly
Stationary 5X Mirror
Light Baffle
Approved For Release 2001/07/17 : CIA-R{ 3~?37?8B04747A001100010007-2
Figure 6.
 Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
Q 450 heat. reflecting mirrors
1.500 Watt Projection lamps
3 Pa 1 1 M1sh i nqF
-24-
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
Figure 7.
 Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
VIEWER, REAR VIEW - LAMP LIOUSINGS
D Lamp Ilous inyys
Lamp Fans
O Terminal Board 45
? Terminal Board #4
O Terminal Board #9
- Fans
? Vibration Isolation Mount
ansmitting Reflectors
d Tr
Infrare
O
Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
Figure 8.
 Approved For Release 2001/07/17 : CIA-RDP78B04747A00110001,0007-2
BOTTOM VIEW, TRANSLATION AND LUMP FAN ASSEMBLIES
O Lamp Fans
0 Terminal Board #3
Adjustable Microswitch S5
kz~j
? Adjustable Microswitch S6
5 Magnification Translation Cram Assembly
-26-
Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2 Figure 9.
 Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
BOTTOM VIEW, TRANSLATION AND FOCUSING
CAM ASSEMBLIES
? X Movement Drive Motor
LJ' Y Movement Drive Motor
? Magnification Translation Drive
? Duplex Clutch
?5 50X Worm Gear Box and Focus Cam
0 5X Worm Gear Box and Focus Cam
Figure 10.
r -27-
Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
 I 1 1 I A*provell For F1?IeaseI2001/0/17 : clA-RDI$8B04I47AOOt1000111O07-21
0 S,-eco Adjustment, Magnification Translation. Motor
2a Illumination Control Relays
3O Brightness Control Circuit
? Magnification Translation Motor Power Su3ply
5O Terminal Board #6
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
1 t t
Figure 11.
 Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
Insert End of Film Under Lip
Approved For Release 2001/07/17 : CIA-RDP78B04747A001100010007-2
-29- LOADING FELM HOLDER
Figure 12.
 STATINTL
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2
Approved For Release 2001/07/17 : CIA-RDP78BO4747AO01100010007-2