What does the "thickness aperture" mean in the Annual Aspheric Lens

Question

In the creation of “annual aspheric lens”, it mentions that : The aspheric rear face is offset from the front by a thickness measured at a specified radial aperture, which may be zero. The offset means the thickness. in the parameter setting, there is a parameter named “ Thickness aperture”. I am puzzled at the setting of this thickness.

Is it a thickness along z axis? how to calculate the thickness? what does the “ Thickness aperture” mean here? How can I relate this “thickness aperture” to the specific geometric figure? Some times, when changes the value of “thickness aperture” , the geometric figure does not change at all. could someone describe this? Thank you very much.

Ethan · Accepted Answer

Hi @ruik.Zhang,The meaning of “thickness aperture” tells OpticStudio at what radial distance you want to define the object thickness. This is best explained with a picture of the cross-section of an Annular Aspheric Lens. Let’s say we have a lens where Max. Front Aperture = Max. Back Aperture = 20 mm and Min. Front Aperture = Min. Back Aperture = 10 mm. If we specify that we want the thickness to be Thickness = 15 mm, then setting the Thickness Aperture = 10 mm will give this result:If we set the reference for the thickness to Thickness Aperture = 20 mm, we instead get this object:Hopefully this helps to clarify the meaning of that parameter. Let me know if you have any more questions about the Annular Aspheric Lens.Best,Ethan

Sandrine Auriol · Answer

Thank you @Ethan. I will add this to our help files.

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