Mitsubishi Denki Kabushiki Kaisha

Kouichi Takeuchi

Osamu Ito

Masayoshi Shimamoto

Kouichi Yamada

Yoshiki Nakajima

Kyousuke Yoshimoto

Masaya Ito

A recording device for recording information upon optically modulated overwritable magneto-optical recording medium including four magnetic layers first records DC '1' and then a test signal at high and low recording laser power levels upon a test track of the recording medium. The high and low recording laser power levels are successively modified to scan a two-dimensional region of the high and low recording laser power levels, and the optimal high and low recording laser power levels are determined on the basis of the reproduction signal levels corresponding to respective combination of high and low recording laser power levers. The reproduction signal levels are represented upon the .alpha.-K plane which is divided into six characteristic regions, The optimal combination of high and low recording laser power levels is determined as a representative point within the region of correct reproduction with a predetermined allowance.

Growing community of inventors

Amagasaki, Japan

Kouichi Takeuchi