198014 ⎘
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; Recording, reproducing or erasing methods; Read, write or erase circuits therefor; Erasing involving colour change media
Drawing method, erasing method, and drawing apparatus
#2Information recording device and data erasing method
#3Photochromic composite material
#4Optical recording medium, erasure apparatus and erasure method thereof
#5Information recording and retrieval method, and its apparatus
#6Bit-wise optical data storage utilizing aluminum oxide single crystal medium