Magneto-optical head device having integrated auxiliary lens and magnetic reproducing head and recording and reproducing device using magneto-optical head device

摘要

A magneto-optical head device includes a light source (1), an objective lens (5) which condenses a light beam emitted from the light source (1), an auxiliary lens (6) which converts an effective numerical aperture of the light beam condensed by the objective lens (5) to irradiate a recording medium (8) with the light beam, and a magnetic reproducing head (7, 72) which is integrated into the auxiliary lens (6). The magneto-optical head device can thus be decreased in size and information can be reproduced from both surfaces of a disk since the magnetic reproducing head (7, 72) is integrated into the auxiliary lens (6). Further, when a thermomagnetic recording medium is employed as the recording medium (8), the magneto-optical head device can reproduce information recorded at a high track density and a high line density.