LEEF process improves performances of EMI windows

The technology, known as laser-evolved electroforming (LEEF), achieves this by producing grids/meshes with a combination of improved attenuation and levels of optical clarity and visible light transmission more commonly associated with vapour-deposited conductive coatings.

The process uses laser direct imaging in combination with precision electroforming to produce high-accuracy grids and screens in a single additive process, without the need for tooling.

The process can produce low-stress grids with high aspect ratios, generating thinner bars, down to 16um, in thicker material, providing increased electrical conductivity along with greater visible light transmission.

Anthony Marrett, managing director of Precision Micro, said: ’LEEF is a high-precision manufacturing process that doesn’t depend on costly glass masters or in fact any tooling.

’We now have a high-precision, repeatable process that can make single- or multiple-piece parts in a very efficient manner that is reducing our customers’ costs,’ he added.

Traditional woven meshes are prone to optical distortion and have distinct aspect ratio limitations, whereas a LEEF-produced grid is dimensionally consistent and free of optical distortion, according to the company.

LEEF grids/meshes can have profile aspect ratio well in excess of 1:1, which can optimise visible light transmission while providing up to 80dB of attenuation.

Available in both nickel and copper, LEEF grids/meshes tend to have a shiny and a matt side, but optional blackening is available to reduce reflections.