| 摘要 |
An electrical appliance and, particularly, a hand-held appliance of the type used in close proximity to an individual, such as a hair dryer, cellular telephone, or the like, and which is shielded from emission of electromagnetic radiation. Appliances which are particularly susceptible to generation of electromagnetic radiation are those which include electrical coils as, for example, transformer coils or heating coils. In all cases, the appliance is provided with a shield substantially covering the exterior surface of the appliance. In the case of a hair dryer and similar appliances which have a long tubular barrel and a hand grip portion, both the barrel and the hand grip portion are completely covered with an electromagnetic insulating material. The preferred electromagnetic insulating materials which may be employed, for this purpose, are materials having a high degree of magnetic permeability, usually in the nature of iron alloys. Also in accordance with the present invention, it has been found that by double winding any coils, that is having a first set of coils wound in a first direction and a second set of coils wound in a second direction, that radiation emission is substantially reduced. It has also been found that when the electrical wire extending through the appliance is wound in the form of a braid, that electromagnetic radiation is still further reduced.
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