A louver for directing airflow in a refrigerated display case, and a refrigerated display case employing a louver. In the write element, a lower coil surrounds in a spiral form a back gap portion, arranged within a height of a lower pole. The arms extend outwardly from respective side edges of the block, with radial axes orthogonal to each other so as to be adjacent to each other. The secondary circuit has a timing generating circuit generating timing signals for generating the transmit signals. Simultaneously, interlayer via-connections are performed by means of the conductive material filled into the through holes.