Re: lenticular screen design

[P3D George Gioumousis <georggms@xxxxxxxxxx>]

P3D Tony McDougall wrote
> 
> G'day all,
> 
> I'm interested in the theory underlying the design of lenticular
> screens.
> -------------------- snip -------------------------------------- 
> I've gained some insight into lenticular design principles using
> fundamental (geometrical) optics theory but factors such as the number
> of lenticules per centimetre (or inch), the radius of the lens element,
> the finite width of the image stripes behind each lenticule and the
> thickness of the screen are all things that I need to gain a greater
> understanding of.
> 
I posted some patent numbers a while ago; see the archives, or mail
me directly. The Nimslo has lenticules that are .005 inch, the four
image stripes are .001 inch wide with no space in between. I think
the eye is supposed to see stripes 1 and 3 or 2 and 4. [Does anyone
know for sure?]

I did the optics once, but I have no idea where the notes are. However,
take the focal length of the lens such that the image of your eyes at
the thickness of the print is .002 inch. Now guess at the refractive 
index of the clear plastic print material. [I just looked up cellulose
acetate in my old (75-76) Handbook of Chemistry and Physics. It is 
1.46 to 1.49. Many other polymers are pretty close.] From the focal
length you can calculate the radius.

Hope this helps.

George Gioumousis
GeorgGms@xxxxxxxxxx
and Physics), 


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