Re: ink jet vectographs

[P3D Andrew Woods <andrew@xxxxxxxxxxxxxxxxxxxxx>]

John Bercovitz asks:
> I missed how the direction of polarization of the inks is maintained.
> Could you elucidate?

Quoting from "Full-color 3-D prints and transparencies" by J. Scarpetti,
P. DuBois, R. Friedhoff & V. Walworth 
which appears in the conference proceedings: "Stereoscopic Displays and 
Virtual Reality Systems IV" 
        http://info.curtin.edu.au/~iwoodsa/stereoscopic/proc

-> Our material comprises .005" film base with oriented layers of PVA 
-> laminated to the two surfaces.  The orientation of each of the PVA layers
-> is at 45 degrees to the edge of the sheet, and the two are at 90 degrees
-> to one another.  Overlying each of the PVA laters is a thin metering layer
-> of a non-oriented ink-permeable polymer.
-> 
-> Figure 4 shows the structure of a typical dichroic dye that is suitable 
-> for forming polarizing images when it is imbibed imagewise into an oriented
-> PVA layer.  The dye molecule is sufficiently flexible that it readily
-> aligns with the oriented PVA molecules, so that the dye may adsorb to the 
-> to the PVA and form an efficient dichroic polarizer.

Cheers,
Andrew Woods.

p.s. the proceedings are now available from SPIE for US$99 
     (US$75 SPIE members)



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