From: nospam@null.void   
      
   On Wed, 07 Aug 2013 09:37:28 -0400, Phil Hobbs wrote:   
      
   > On 8/6/2013 11:03 PM, Salmon Egg wrote:   
   >> In article <5201197F.2080904@electrooptical.net>,   
   >>   Phil Hobbs  wrote:   
   >>   
   >>> I have an application where some retroreflecting tape with   
   >>> not-so-tight a reflectance pattern would be very useful.  Something   
   >>> along the lines of 5 degrees FWHM vs 0.5 degrees for most of the high   
   >>> performance stuff.   
   >>   
   >> At one time, 3-M had a series of such sheets. They probably still do.   
   >> In AC and I presume other states, it is used for retroreflective   
   >> registration stickers.   
   >>   
   >>   
   > I've been through the Scotchlite catalogues, but they all seem to be the   
   > narrow-angle stuff.  Some are brighter than others, but that seems to be   
   > pigment and stuff rather than a narrow return angle.   
   >   
   > Maybe some low-index glass beads.   
   >   
   > Cheers   
   >   
   > Phil Hobbs   
      
   Projection screens using glass beads have a relatively wide reflection   
   pattern, probably wider than you want, but possibly worth looking into.   
   Not tape either, but could be cut up and glued on for low volume.   
      
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