Patent ID: 7057112

Claim:
An electric wire, comprising: a core unit; and a sheath surrounding said core unit, and including an inner layer surrounding said core unit, and a transparent outer layer surrounding said inner layer, said outer layer having a cross-section including a plurality of first crest regions, and a plurality of second crest legions that are alternately disposed with said first crest regions, each of said first crest regions cooperating with an adjacent one of said second crest legions to define a trough region therebetween; wherein each of said first crest regions has a thickness less than that of each of said second crest regions; wherein said core unit comprises at least two sheathed wires that are twisted together about a central axis, each of said sheathed wires including an insulation layer and a conductive core surrounded by said insulation layer; and wherein said inner layer has a cross-section that comprises a plurality of crest regions and a plurality of trough regions, each of said trough regions being formed between two adjacent ones of said crest regions of said inner layer, each of said crest regions of said inner layer being registered with a respective one of said first crest regions of said outer layer, each of said trough regions of said inner layer being registered with a respective one of said second crest regions of said outer layer the distance from each of said first crest regions of said outer layer to said central axis being shorter than that from each of said second crest regions of said outer layer to said central axis.