| 摘要 |
PURPOSE:To excellently and stably record information on an optical card by discriminating a period, when optical beams made incident on an optical card are focus- regulated, from the period when the optical beams made incident on the optical card are modulated according to information and a recording track where the information is recorded is formed on the optical card. CONSTITUTION:In a forward or a backward operation scanning period when the recording track, where the information is recorded, is formed on an optical card 10, the optical beams made incident on the optical card 10 are practically in a suitable focusing condition. That is, the period, when the optical beams made incident on the optical card 10 are focus-regulated, is discriminated from the period, when the optical beams made incident on an optical card 10' are modulated according to the information so as to form the recording track where the information is recorded on the optical card 10' and the forward or backward operation scanning is executed for the optical card 10'. Consequently, a focusing driving signal necessary for the focus-modulation of the optical beams does not trouble the scanning at the time of forming the recording track on the optical card 10' of the optical beams and the modulation according to the optical beam information. Thus, information recording on the optical card 10' is excellently and stably executed. |
