Patent ID: 6926077

Claim:
A foldable heat radiation board comprising: a plurality of elongated plate members each having a front surface, a back surface, and fluid tube embedding grooves in one of said front surface and said back surface, said plate members being arranged in a substantially quadrangular plan configuration so that adjacent sides of adjacent plate members contact each other; fluid tubes embedded in said embedding grooves; a heat radiation sheet attached to an entirety of said front surface; a back surface material attached to at least a portion of said back surface; and a plurality of folding portions formed along said adjacent sides of said adjacent plate members, each of said folding portions having a fluid tube outlet portion in a side of a first one of said adjacent plate members, having a fluid tube inlet portion in a side of a second one of said adjacent plate members, and having a fluid tube cutout portion connecting said fluid tube inlet portion and said fluid tube outlet portion, said fluid tube outlet portion and said fluid tube inlet portion being arranged so as to be offset from each other and thereby not directly oppose each other; wherein a portion of one of said fluid tubes is arranged in each of said folding portions so as to extend substantially parallel to said adjacent sides of said adjacent plate members from said fluid tube inlet portion to said fluid tube outlet portion through said fluid tube cutout portion; and wherein at least one of said heat radiation sheet and said back surface material is discontinuous along each of said plurality of folding portions.