Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-02-26
2001-10-30
Picard, Leo P. (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S679090, C353S119000, C353S122000, C349S058000, C345S905000, C312S007200, C312S223100, C248S917000
Reexamination Certificate
active
06310767
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to the field of encasings for electronic equipment. More particularly, the invention relates to an apparatus for shielding emanations from electronic equipment in a display unit.
BACKGROUND OF THE INVENTION
Electronic equipment generates electric “noise,” including, for example, electromagnetic interference (EMI) and radio frequency (RF). In some applications, EMI may be of such a level as to be hazardous to nearby personnel. EMI from electronic equipment can also cause deleterious effects to other electronic equipment. Furthermore, if EMI from an electrical unit reaches a high level, the unit may be judged unsafe by governmental agencies such as the Federal Communications Commission and be required to be recalled and redesigned by the manufacturer.
One attempt to reduce the effects that electrical emanations (such as EMI) have on other electronic equipment is redesigning circuit components. Such redesigning is costly and has limited effects on minimizing electrical emanations.
Another conventional attempt to reduce the effects of electrical emanations includes using a foil shield, placed around the electronic circuitry and connected to ground. Such a shield can reduce in-line metal radiation from electronic circuitry. The foil shield is constructed by adhesively coating an aluminum or cooper foil on both sides of the circuitry and applying an outer wrapping layer of polyester or plastic material thereto. Such aluminum and cooper foil shielding is costly to manufacture and not sufficiently durable.
One conventional attempt to shield electrical emanations in display units has been to place a metal shield between the electrical equipment of the display unit and the display screen. The metal shield is generally a separate piece added at some stage in the manufacturing process. However, having an additional and separate shielding piece is difficult to install and obtain maximum shielding.
Thus there is a need for an apparatus which shields emanations emitted from electronic equipment within a display unit, which is durable and which improves shielding efficiency. Even further, there is a need for a shield which minimizes electrical noise escaping from the display unit without making manufacturing, installation, or assembly difficult or costly.
SUMMARY OF THE INVENTION
One embodiment of the invention relates to a display unit. The display unit includes at least one electronic component, a display, and a body. The display is coupled to the at least one electronic component. The body extends about the at least one electronic component and supports the display. The body includes a front portion, a rear portion, a bottom portion, and a panel. The front portion is on a first side of the at least one electronic component and supports the display. The rear portion is on a second opposite side of the at least one electronic component. The bottom portion extends between the front portion and rear portion below the at least one electronic component. The panel extends between the at least one electronic component and the display. The panel includes at least one layer integrally formed as part of a single unitary body with at least one of the front portion, the rear portion, and the base portion, whereby the plane shields emanations emitted from the at least one electronic component and minimizes adverse effects of the emanations on the display.
Another embodiment of the invention relates to a display unit. The display unit includes electronic equipment, a housing encasing the electronic equipment, a display coupled to the electronic equipment, and a means for shielding emanations emitting from the electronic equipment. The shielding means is integrally formed as a part of a single unitary body with the housing and located between the electronic equipment and the display.
Another embodiment of the invention relates to a display unit which shields emanations emitting from within the display unit, whereby interference with electronic equipment not contained within the display unit is minimized. The display unit includes electronic equipment, a housing extending about the electronic equipment, a display coupled to the electronic equipment, and a shield. The shield is integrally formed as part of a single unitary body with the housing and located between the electronic equipment and the display.
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Spear Phillip G.
Vallee John R.
Case Corporation
Foley & Lardner
Lea-Edmonds Lisa
Picard Leo P.
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