Patent ID: 8582408
Filing Date: 2013-11-12
Classification: G11B

Abstract:
1. An optical read/write apparatus comprising: a plurality of light sources including a first light source and a second light source; an optical system which converges, onto an optical storage medium, a write beam emitted from the first light source and a read beam emitted from the second light source so that the same location on the optical storage medium is scanned with the write beam before being scanned with the read beam; a signal detector which senses the write and read beams that have been reflected from the optical storage medium and which generates electrical signals; a power monitoring detector which monitors the optical powers of the first and second light sources; and a control section which controls the optical powers of the first and second light sources and which modulates the optical power of the first light source so that a signal mark is recorded on the optical storage medium with the write beam in a write mode, wherein in an optical power control range in which writing user data on the optical storage medium is temporarily suspended, the control section writes non-user data on the optical storage medium and turns the second light source OFF while writing the non-user data, and wherein the power monitoring detector obtains optical power information of the first light source while the second light source is OFF, wherein a time t it takes for the write beam or the read beam to pass through the optical power control range and one period T of the optical power control operation satisfy the inequality T/t≧100.