A projection lens assembly (10) projects onto a display screen (38) electrons emitted from an output side (86) of an electron multiplier such as, for example, a microchannel plate (70). The projection lens assembly includes a dome-shaped mesh element (16) that is concave as viewed from the display screen....http://www.google.com.au/patents/US5134337?utm_source=gb-gplus-sharePatent US5134337 - Projection lens assembly for planar electron source
