An optical disk apparatus includes a tilt detection unit detecting the tilt value of an optical disk medium with respect to an optical system. of semi-conductor devices can be solved by using molybdenum-containing tungsten as the material of metal interconnect layer. The object under inspection absorbs radiation in a manner dependent upon its metal content. The image continues to move until the command signal is terminated. 2 to 3, and a pour point of lower than 20\xb0 C.