IMPROVED SCREEN FOR REAR PROJECTION VIEWERS

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP79B00873A002000010071-4
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: November 8, 2012
• Sequence Number: 71
• Publication Date: January 6, 1967
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873A002000010071-4
twIDENTIAL
CORNING GLASS WORKS
ELECTRO-OPTICS LABORATORY
RALEIGH, NORTH CAROLINA
IMPROVED SCREEN FOR REAR-PROJECTION VIEWERS
Technical Report No. - 17
Date - January 6, 1967
Period Covered - December 12;" 1966
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January 6, 1967
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Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873A002000010071-4
 Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873AO02000010071-4
TECHNICAL REPORT NO. 17
A. Glass-Ceramics
Remelts of the AU series with lower particle concentrations are being
made. Samples AS-4 and AS-9 are being remelted to obtain samples
which are more homogeneous than those first obtained. At the same
time we are requesting samples containing larger particles. These
materials will have greater variation in brightness but will scatter
more light into the +450 viewing angle and will be less sensitive to
ambient light. Investigations relating to fabrication techniques for
large screens are continuing; some glass-ceramic?materials are being
prepared for this work.
B. Fotoform" Glass
Three prototype rear-projection screens were fabricated from Fotoforin
glass and are being evaluated visually. Other samples of this glass
containing a Ronchi ruling pattern are being made and etched to give
an etched lenticular surface.
C. Metallic Particles in Glass
Work is continuing to obtain acceptable samples containing metallic
particles. Thus far a sample containing .5 micron diameter particles
has been made; however, certain difficulties relating to color effects
have been encountered.
D. Material., Comparisons
A mos:ihac made up of 8 commercial screens and 9 samples of CGW materials
has been completed. It shows visually that the requirements of +15% on
brightness uniformity are unnecessarily stringent. A detailed discussion
of this will be given in the next full technical report.
An instrument to measure the sensitivity of rear-projection screens to
ambient illumination has been constructed and is being evaluated. A dis-
cussion of this instrument, its principle of operation, and some initial
results will be reported in Technical Report No. 18.
Declassified in Part - Sanitized Copy Approved for Release 2012/11/08: CIA-RDP79B00873AO02000010071-4