REQUEST FOR PROPOSAL NO. ED-12-66 'ADVANCED REAR PROJECTION VIEWER'

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A001900020008-3
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 6
• Document Creation Date: December 28, 2016
• Document Release Date: February 23, 2005
• Sequence Number: 8
• Publication Date: September 23, 1966
• Content Type: LETTER

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In Reply Refer To: T3774-65
9965-3302
23 September 1966
Post Office Box 8031
Southwest Station
Washington, D.C. 20024
Reference: 1) Report 65-184, Amendment to Advanced
Rear Projection Viewer, July, 1966
2)
dated 11 August 1966
Enclosure: Amendment to Advanced Rear Projection Viewer
dated 23 September 1966 (4 copies)
Subject: Request For Proposal No. ED-12-66
"Advanced Rear Projection Viewer"
I submits herein our firm fixed price proposal for the addi-
tion o an automatic film threading device and millimeter mensuration
in the "Y" axis to the Advanced Rear Projection Viewer. The technical
description of this change is presented in the enclosure, which super-
sedes in Reference 1) document submitted by the Reference 2) letter.
firm fixed price for this addition is~ This price STAT
is additive to our proposal previously submitted. All other terms and
conditions of the reference letter remain unchanged.
Supervisor,
AWB: gc
Declass Review by NGA.
STAT
STAT
STAT
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065-184 STAT
9965-3302
STAT
STAT
23 September 1966
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This amendment describes additions to the Advanced Rear Projection Viewer which
consist of an automatic film threading device, X-Y axes millimeter counters and
displays, and an internal maintenance light. This supersedes the amendment dated
STAT July 1966 (refer to
65-184 dated December 1965).
The film threading device, which facilitates film loading in the Advanced Rear
Projection Viewer, consists of the following (see illustration):
1. A linear potentiometer located at the supply (feed) reel
2. A special take-up reel constructed with one fixed flange and
one movable flange
3. A ball lead screw and nut which positions the movable flange on the
take-up reel
4. A dc motor which drives the ball lead screw
5. A rotary potentiometer
6. A duty cycle amplifier
7. Forty-eight inches of 70-mm, 0.006-inch-thick mylar leader affixed
to the take-up reel hub.
Operational Description
The reel of film to be viewed is placed on the supply side of the transport by the
operator. The end of the film is attached with tape to the permanent mylar leader
and the reel locking arm clamps the reel securely in place. The wiper of the linear
potentiometer is attached to the reel locking arm and its position causes the dc
motor, at the take-up reel, to drive the ball lead screw until the rotary potentio-
meter is nulled with the linear potentiometer at the supply reel. The movable flange
is automatically positioned on the take-up reel for the proper width of film being
used. When the reel locking arm is unlocked during the film loading operation, the
movable flange is automatically positioned for the widest film (9 1/2 inches).
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NOTE: FILM TRANSPORT STRUCTURE
OMITTED FOR CLARITY.
REFER TO FIGURE 3-12.
LINEAR
POTENTIOMETER
I65-184
RADIAL MULTI-TURN
POTENTIOMETER
REEL HUB RECESSED
FOR LEADER
AUTOMATIC FILM THREADING DEVICE
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The positioning of the movable flange on the take-up reel (the opening between the
flanges) is commensurated with the tolerances allowable by AF Standard 51C17848,
"Spools, Aerial Film."
The hub of the take-up spool is recessed to allow the mylar leader to be wound
flush with the outside of the reel core, which prevents the film from winding at a
taper. The mylar leader has a tensile strength of 25,000 psi. Based upon projected
use, the mylar leader is expected to last the. life of the viewer. However, if
inadvertently damaged, the leader is detachable for replacement.
The counter system for the Advanced Rear Projection Viewer enables the operator to
measure, in 1-mm increments, film distances in both axes to an accuracy of 0.5 mm
in 40 inches.
Each axis consists of a rotary photoelectric pulser and an electronic counter
indicator mounted on a control panel.
Mensuration input along the film is provided by a film driven metering roller,
which, in turn, drives one of the rotary pulsers.
Input for the mensuration across the film is provided by the ball lead screw which
translates the film transport. The rotary pulser is coupled to the lead screw.
The mensuration system along the film will be provided in lieu of the footage
STAT counter defined in l165-184, page 3-15.
Detailed Description
Metering Roller - Y Axis Counter
The low inertia roller, with its circumference being equal to 120 mm provides input
for the associated Photoelectric Rotary Pulser. The direction sensing pulse.r is
driven directly by the metering roller shaft. Each revolution provides 120 signal
pulses for the Y axis electronic counter indicator.
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Ball Lead Screw - X Axis Counter
The rotary pulser is driven directly by the table translating ball lead screw,
having a 5-mm lead, and provides five signal pulses per revolution for the X axis
electronic counter indicator.
The up-down counters consist of electronic components which accept the pulses from
the rotary photoelectric pulsers and indicate the accumulated count on a 5-digit and
sign (plus or minus) display. A pushbutton zero-reset will be located on the
control panel adjacent to each indicator.
The Advanced Rear Projection Viewer features a completely sealed enclosure, with
slightly positive internal pressure achieved by filtered air.
An internal light is turned on each time the front access door is opened for film
loading or viewer maintenance.
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