Optical disc recording apparatus, optical disc recording circuit and optical disc

Abstract

An optical disc recording apparatus () is provided with a tracking servo () for tracking a spiral track of concave and convex marks, an analog signal processor () for extracting a reproduction signal corresponding to the concave and convex marks, a digital signal processor () for extracting a channel clock synchronized with a channel bit length of the concave and convex marks, and a sub-information recording section () for recording sub-information by irradiating laser light based on the tracking to the spiral track. The sub-information recording section () records all the sub-information by repeating a process of recording a part of the sub-information by discretely irradiating laser light at a specified interval and with a specified frequency in synchronism with a channel clock by one tracking to form recordable marks on a reflective film a plurality of times. By this construction, a tracking control to the concave and convex marks can be stably executed and the sub-information can be stably recorded.