Method for controlling optical recording

Abstract

Abstract PURPOSE:To provide a large margin to the environmental variation such as temperature and power voltage by setting up the quantity of irradiated light of a recording beam in a saturated range for the change of jitter variable, and to form appropriate recording pits having no jitter on the whole positions of a disc. CONSTITUTION:Digital data ( I ) to be recorded are inputted to an MFM modulating circuit 1 and converted into an MFM signal (II). In a jitter compensating circuit 2, an AND gate 4 finds AND between an MFM signal outputted from the MFM modulating circuit 1 and a signal delayed by DELTAT by a DELTAT delay circuit 3 to generate a jitter compensated MFM signal (III) of which pulse width is compressed by DELTAT. The jitter compensated MFM signal is converted into a power pulse signal by a light source driving circuit 5 and then supplied to a laser light source 6. The laser light source 6 forms pits on a disc medium with the jitter-compensated pulse width.

Inventors

• 👤 Hiroshi Ichii
• 👤 一井　博
• 👤 Kazuo Kumagai
• 👤 熊谷　和雄
• 👤 Toshiyuki Kasada
• 👤 笠田　利行

Bibliographic Details