PURPOSE:To perform high speed reading, by providing a lens and a Farady rotating body between a thin film waveguide of an integrated circuit optical construction and a magnetic recording medium, and detecting ligh through the reciprocation from the thin film waveguide to the magnetic recording medium. CONSTITUTION:A laser light L1 incident to an integrated circuit optical construction body 10 consisting of a thin film waveguide 12, a substrate 13 and a photocoupler 14 from a light source 20 is rotated for the luminous flux with a magnetic field of a driving magnetic field circuit 25 at a Farady rotating body 22 and formed on a magnetic recording medium 24 with a lens 23 and reflected. The light refelected at the medium 24 with vertical magnetization characteristics is transformed from straight line polarization into elliptic polarization and the rotation of polarized plane proportional to the magnetization is caused. This reflected light passes through the same path as the incident light and a signal is reproduced at a photodetector 26 via the photocoupler 14 Thus, the high speed readout can be made possible with a simple constitution.
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