Frommer Lawrence & Haug LLP
Magneto-optical recording and/or reproducing apparatus having a plurality of optical systems
 A magneto-optical recording and/or reproducing apparatus having a magnetic head and first and second optical systems for recording on and/or reproducing from first and second magneto-optical media. The first optical system has a first objective lens, and the second optical system has a second objective lens whose numerical aperture differs from that of the first objective lens. The magnetic head is arranged near the second objective lens. The first and second optical systems are arranged such that the respective one of the first and second magneto-optical media which is currently being subject to recording or reproducing is positioned between the first and second optical systems. 
Sony Corporation
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Tamotsu Tetsu
Yamagami Watanabe