Optical information access system capable of reliable jump back control

摘要

In the optical information assuring system for the optical disc 1 including a plurality of spiral formed tracks T ₁ , T _2, ..., the counter 1301 counts the sectors SC ₁₀ , SC ₁₁ , 1304 compares the value of the counter with a predetermined value to reach the car ungap, is generated from the coincidence signal (S _8), the comparator gate circuit 1308 is matching a jump back signal (S ₅₎ signal When data processing is ideally interrupted in the optical disk and a coincidence signal is generated, the predetermined value is switched from the first value to a second value larger than the first value.