Patent ID: 8189347

Claim:
A printed board unit comprising: a plurality printed board including a first printed board and a second printed board; and at least one fixing part, interposed between said first printed board and said second printed board, fixing said first printed board and said second printed board such that said first printed board and said second printed board overlap and keep a predetermined space between said first printed board and said second printed board, wherein said fixing part comprises: a first fixing piece fixed to said first printed board; a second fixing piece fixed to said second printed board; a first intermediate fixing piece disposed between said first fixing piece and said second fixing piece; and optionally one or more second intermediate fixing pieces, detachably interposed at least one of between said first fixing piece and said first intermediate fixing piece and between said second fixing piece and said first intermediate fixing piece, wherein said first fixing piece comprises a first male screw projecting toward said second printed board; said second fixing piece comprises a second male screw projecting toward said first printed board; each of said second intermediate fixing pieces comprises a first female screw into which said first male screw of said first fixing piece or said second male screw, of said second fixing piece is screwed, and a third male screw projecting toward said first printed board or toward said second printed board on an opposite surface to that with said first female screw; and said first intermediate fixing piece comprises a second female screw into which said first male screw of said first fixing piece or said third male screw of one of said second intermediate fixing pieces is screwed, and a third female screw into which said second male screw of said second fixing piece or said third male screw of one of said second intermediate fixing pieces is screwed.