Re: [ATM] Lens requirements

[Woodchuck <djv@bedford.net>]

On Tue, 1 Feb 2005, Arjan te Marvelde wrote:

> Hello list,
>
> I need to make an optical system that produces a virtual image of a micro
> display, much like a loupe would do. The display is max 10x10mm (square or
> rectangle), and the lens is placed just in front of the eye, like with
> binoculars. The spacing lens-display is up to 5cm (2").
>
> My question is: what would be a good design of such a lens system?
>
> Any answer is very much appreciated. If it is considered too much off topic,
> please respond off line.
>
> Thanks for any response,
> Arjan te Marvelde

I think this is the first of several responses that will ask what
magnification you need.

To get the ball rolling:

For low mag, you can do with a plano-convex lens, plano side to
the object.  If you want to be fancy, then an eyepiece design
with a fl of 2" will probably serve, something like a Hastings
triplet or even a Ploessl.

For higher mags, probably some sort of compound microscope, like
those used in semi-conductor manufacture or biological dissecting.
these have the space between objective and object you require.

Your requirements are quite reasonable and should be easily satisfied,
except that the 2" spacing makes certain magnifications difficult,
I think.  (10X with a simple eyepiece magnifier would be out, a
compound microscope might be at its lower limit, so maybe some sort
of design like a retrofocus lens might be needed.)

I'm no expert.

Dave
-- 
        In each of us, there burns a soul of a woodchuck.
        In every generation a few are chosen to prove it.

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