Sony Corporation

Masazumi Shiozawa

Hiroshi Kawashima

Kiyoshi Omori

Hitoshi Taniguchi

Kazuya Sunami

Hidehiko Yamamoto

Tetsuji Kawashima

Kunihiko Miyake

Shinji Ohta

Futoshi Tsukada

A disk recorder/player () including a skew adjusting means of a thin design is provided which includes a base (), a disk rotation driving mechanism () for an optical disk (), an optical pickup (), first and second guide shafts () to support the optical pickup () at opposite ends of the latter, an optical pickup moving means () guided by the first and second guide shafts () in moving the optical pickup () radially of the optical disk (), an elastic member () put in contact with the first and second guide shafts () to force the first and second guide shafts () in a direction generally perpendicular to the main side of the optical disk (), an adjusting screw () put into contact with the first and second guide shafts () from the opposite side of the elastic member () to move the first and second guide shafts () in a direction opposite to the direction of forcing by the elastic member (), and a skew adjusting means () which adjusts a skew, if any, by adjusting the inclination of the first and second guide shafts () by the adjusting screw ().

Recording and/or playback device

An optical disc having a power calibration area for calibrating the power of a data recording laser beam. The power calibration area is provided at an inner peripheral part of the disc and has test areas and count areas. The test areas are provided to accomplish trial writing of data, and the count areas are provided to record data representing the use condition of the test areas. Data is recorded on the optical disc, while calibrating the data recording laser beam. The number of the test areas is increased in accordance with an increase in the recording density of the optical disc. The optical disc may be a double-density CD. In this case, the disc has 800 to 1200 test areas. The test areas have the smallest possible size, and the count areas are provided in the smallest possible number. Therefore, the disc can have sufficiently large data regions. Thus, the power of the data recording laser beam can be therefore adjusted many times. The amount of data that can be recorded on the optical disc therefore increase.

Optical disc, data-recording apparatus and data-recording method

Growing community of inventors

Tokyo, Japan

Masazumi Shiozawa