EMI Shielded Window Provides Optical Clarity on CRT

A manufacturer of process control instruments needed to improve the readability of shielded CRT displays on a number of its models. Shielded windows used on the CRTs significantly reduced light transmission, resulting in undesirably dark screens. Some displays were also troubled with distorted text when the mesh in the shielded windows presented moiré pattern problems. The solution could not add cost or reduce the current shielding effectiveness.

Chomerics provided emiclare™ EMI shielded windows to improve CRT readability at costs less than the previous method. The emiclare windows feature a unique wire mesh weave developed for brighter image quality through higher light transmission. These polycarbonate windows are fully laminated with optically matched adhesives to reduce losses from reflection and dispersion. Their front surfaces have a non-glare hardcoat, and a clear hardcoat is on rear surfaces.

Together, these construction features provided great improvement to the CRTs' optical performance. They also provided better shielding performance, surpassing 50 dB effectiveness at 100 MHz. The emiclare shielding windows were delivered in 2 weeks at unit costs below the original window prices.

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