| 摘要 |
PURPOSE:To separate an overwtite spot and a verify spot in a desired light quantity ratio by inclining the optical axis of a second approximately rectangular prism at 45 deg. to the direction of polarization of the luminous flux emitted from the third end face of a first approximately rectangular prism. CONSTITUTION:Light is separated to the overwrite beam and the verify beam in directions of polarization orthogonal to each other in a prescribed light quantity ratio by a uniaxial crystal prism 16-1, and they are made incident on a magneto-optical disk. They are condensed as an overwrite spot and a verify spot on the disk, and respective reflective reflected beams are allowed to pass a uniaxial crystal rectangular prism 16-2, which is joined to the prism 16-1 and has the optical axis inclined at 45 deg. to the direction of polarization of the incident beam to the magneto-optical disk in a plane perpendicular to the reflected beam, and a glass prism 16-3 joined to the prism 16-2 and are separated to four beams whose directions of polarization are orthogonal to one another. Thus, photomagnetic signals of the overwrite beam and the verify beam are obtained. |
