Mesh assembly having reduced microphonics for a pick-up tube

In a pick-up tube having a generally cylindrical envelope, a faceplate at one end of said envelope, a photoconductive target electrode adjacent to said faceplate, a cathode in the other end of said envelope and a mesh assembly disposed in spaced relation adjacent to said target electrode, between said target electrode and said cathode, the improvement wherein said mesh assembly comprises:

• a mesh electrode disposed between a frustro-conically shaped mesh support ring and a dished, spring-like mesh damping ring, said mesh damping ring being fixedly attached at a plurality of spaced points around its outer periphery to said mesh electrode and said support ring, whereby said mesh damping ring is compressed into a reversal of its dished shape and assumes an undulatory configuration contacting said mesh electrode periodically around the inner periphery of said damping ring, thereby retaining said mesh electrode with reduced microphonics.