[ATM] Hartmann mask

[jonah at eecs.berkeley.edu (Jeff Anderson-Lee)]

--- Vladimir Galogaza <vladimir.galogaza@zg.tel.hr>
wrote:

>...  They have computer controlled cuting
>machine
>( sort of the xy plotter ), which cuts out the
>patern in
>selfadhesive PVC foil o.1mm thick.
>After separating it from the paper holding the foil
>it is mounted on the mirror.
>Because adhesive is strong and foil thin it is not
>easy to
> mount the foil on the mirror  without deforming the
>hole patern.
>And peeling the foil from the mirror is practicaly
>impossible
>and leads to the foil damage. Therefore such a mask
>is only 
>for one time use.
>
>To avoid this,  second mask was made on the computer
>
>controlled laser cutter from a hopefully more
>suitable material.
>Material for the mask was rubber sheet 1mm thick.
>The rubber is soft and if mirror is laying on its
>back
>the mask conforms by its own weight to the mirror
>curve
>and double sided tape is not required.
>  
>
Am I missing something?  I thought the mask was supposed to be rigid and 
stand in front of the mirror.

Jeff Anderson-Lee
Sacramento, CA