A washer pump motor includes a case having a pair of arcuate walls and a pair of flat walls. The body is formed with an elongate post that extends to the distal end. These values are maintained in such a way as to allow the replicated-data system to reliably satisfy some read requests even though half, or less than half, of the replicas of the data item are available. The laser light fluxes of the colors are distributed and condensed by the microlenses and introduced to the corresponding pixels and then reflected by the corresponding reflecting layers. The defect extension preventing layer has a different crystal structure from that of the impurity diffusion layer.