News Column

Patent Issued for Method of Shielding an Electronic Component from Electromagnetic Interference (EMI)

July 23, 2014

By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Wurzel, Josh (Sunnyvale, CA); Gettemy, Shawn Robert (San Jose, CA); Al-Dahle, Ahmad (Santa Clara, CA); Vieri, Carlin James (Redwood City, CA); Yao, Wei (Fremont, CA), filed on November 3, 2009, was published online on July 8, 2014.

The assignee for this patent, patent number 8769811, is Apple Inc. (Cupertino, CA).

Reporters obtained the following quote from the background information supplied by the inventors: "This invention relates to electronic circuitry, and more particularly to shielding that may be used around such circuitry to reduce electro-magnetic radiation from or to such circuitry (so-called electromagnetic interference or EMI).

"A traditional way to reduce EMI for electronic circuitry is to place electrically conducting (typically metal) shielding around the circuitry, which shielding is connected to electrical ground (i.e., a source of electrical ground potential or voltage). For example, several electronic circuit components that have been mounted on a printed circuit board ('PCB') may be placed under a metal cover or inside a metal container ('can'). A layer of electrical insulation may be included between the circuit components and this metal shielding to ensure that the shielding cannot cause any short circuits in the electronic circuitry by making electrical contact with that circuitry.

"A possible problem with the foregoing approach is that the metal shielding is typically fabricated in advance with a predetermined size and shape, which size and shape the shielding retains after the shielding has been combined with the electronic circuitry to be shielded. This means that because of manufacturing tolerances for (1) the electronic circuitry, (2) the shielding, and (3) any insulation used between the circuitry and the shielding, the shielding must be made significantly larger than the theoretical minimum size the shielding could have. Such results are inconsistent with the need to make many types of electronic devices as small as possible."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "In accordance with certain possible aspects of this invention, an electronic component may be shielded by at least partly covering it with a layer of electrical insulation that conforms to the shape of the surface of the electronic component to which the insulation is applied. The electrical insulation is then at least partly covered by a layer of EMI shielding that conforms to the shape of the surface of the insulation to which the EMI shielding is applied.

"Further features of the invention, its nature and various advantages, will be more apparent from the accompanying drawings and the following detailed description."

For more information, see this patent: Wurzel, Josh; Gettemy, Shawn Robert; Al-Dahle, Ahmad; Vieri, Carlin James; Yao, Wei. Method of Shielding an Electronic Component from Electromagnetic Interference (EMI). U.S. Patent Number 8769811, filed November 3, 2009, and published online on July 8, 2014. Patent URL:

Keywords for this news article include: Apple Inc., Electronics, Electrical Insulation.

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Source: Electronics Newsweekly

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