| hopebox |
2010-06-10 21:36 |
Allow me to repost here for depth/frequency setting T>:g
ME
The main fresnel lens types are: ]NhWhJ:
o\V4qekk
* Constant groove depth. sOtNd({
* Contant groove pitch types. !5
:1'$d]H
/iJhC B[QZ
So if your depth is fixed you will define +ve value in the cell and to specify the "height" or "depth" of each groove feature. If the frequency of the groove is fixed then you use -ve value. Say putting down - 5 this implies that there are 5 grooves with a unit length. m_O=X8uj"D
Q9'V&jm
For radius, this is the curvature of the base surface. If you define one such lens and chaneg the radius and you shall see what it means. A graphic tells lounder than words. u$`x]K=Zsm
2|H'j~
For conic: check conic section using Wikipedia and you should see what conic constant means. ng)yCa_Ny
dCJR,},\f
a9q?9X
|
|