bipotential electrostatic lens

bipotential electrostatic lens

[¦bī·pə′ten·chəl i‚lek·trə′stad·ik ′lenz]
(electronics)
An electron lens in which image and object space are field-free, but at different potentials; examples are the lenses formed between apertures of cylinders at different potentials. Also known as immersion electrostatic lens.