Patent ID: 6205092
Filing Date: 2001-03-20
Classification: B82Y,G11B

Abstract:
A magneto-optical recording medium reproduction device for reproducing a signal from a magneto-optical recording medium with a recording layer and a reproducing layer, comprising:laser means for oscillating a laser beam,optical means having an end surface adjacent to said magneto-optical recording medium, for irradiating said magneto-optical recording medium with the laser beam from said laser means via said end surface and receiving a laser beam reflected from said magneto-optical recording medium via said end surface;detection means for detecting the laser beam received by said optical means, andmagnetic field application means for applying an alternating field having a pulse width that ranges from 20 to 500 nsec to said magneto-optical recording medium to expand and shrink a domain created in said reproducing layer,wherein said optical means includes an optical fiber including:a core having a first refractive index;a first clad formed around said core and having a second refractive index smaller than said first refractive index; anda second clad formed around said first clad and having a third refractive index smaller than said second refractive index.