US 5,705,860 AGranted

Inflight entertainment system having EMI and ESD improvements

AssigneesSony Corporation, Sony Trans Com Inc.

InventorsLoi Ninh, Gerald Lester

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Abstract

A vehicle passenger information system, for example an inflight entertainment system, has a combination of improvements for reducing electromagnetic interference ("EMI") and electrostatic discharge ("ESD"). A microprocessor based system controller has a system controller chassis with a first conductive EMI shield layer, a low impedance aircraft chassis ground path directly electrically connected to the shield layer and to controller components. Additionally, a display unit has a chassis with a second conductive EMI shield layer enclosing a plurality of PCBs directly electrically connected to the shield layer. The display unit supports are grounded through a plurality of system connectors penetrating the display chassis and a low impedance display unit ground path directly electrically connects the two shield layers. A method of decreasing the EMI and ESD susceptibility of, and the levels of radiated EMI from, a vehicle entertainment system is also provided.

Claims5

Dependent claims

An improved aircarft inflight entertainment system comprising:

a microprocessor based system controller enclosed in a system controller chassis, said system controller chassis having at least two interconnectable nonconductive sections, each section having an inside and an outside surface, said inside surfaces substantially entirely coated with a first conductive electromagnetic interference ("EMI") shield layer;
a plurality of printed circuit boards ("PCBs)" housed within said system chassis, said system controller PCBs each incorporating internal ground planes directly electrically connected to said first shield layer;
an entertainment system low impedance aircraft chassis ground path directly electrically connected to said first shield layer;
a display unit having a display unit chassis, said display unit chassis having at least two interconnectable nonconductive sections, each section having an interior and an exterior surface, said interior surface substantially entirely coated with a second conductive EMI shield layer;
a plurality of PCBs housed within said display unit chassis, said display unit PCBs incorporating internal ground planes directly electrically connected to said second shield layer;
a metallic bracket attached to and movably supporting said display unit;
a plurality of connectors penetrating said display chassis and electrically connected to said bracket and said second shield layer;
and
a low impedance display unit ground path directly electrically connecting said second shield layer to said first shield layer.

6 more elements

Dependencies are inferred from the claim text.