198118 ⎘
Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation , reproducing using an optical beam at lower power ; Record carriers therefor; Heads, e.g. forming of the optical beam spot or modulation of the optical beam; Means for guiding the beam from the source to the record carrier or from the record carrier to the detector; Lenses Catadioptric lenses, i.e. having at least one internal reflective surface
Recording head for magneto-optical recording device and magneto-optical recording device comprising the same
#2Near-field optical storage medium and optical data storage system therefor
#3Objective lens for high-density optical focusing and an optical disk in an optical pickup
#4Catadioptric objective system and objective system