Patent ID: 8077586
Filing Date: 2011-12-13
Classification: G11B

Abstract:
1. An optical recording head device comprising: a light source configured to output a relaxation oscillation optical pulse with a duration between a first time when a first amplitude is half of a peak amplitude of a single pulse and a second time when a second amplitude is half of the peak amplitude of the single pulse 820 ps or shorter; a driver configured to drive the light source; an objective lens configured to converge an emitted light from the light source on a recording layer of a recording medium, and to capture a reflected light from the recording layer of the recording medium; a distributor between the light source and the objective lens, and configured to distribute an incident light; and a photo-detector configured to detect the reflected light via the distributor, wherein a resonator length of the light source is 6560 μm or shorter, and the relaxation oscillation pulse with a cycle in a range of between one cycle and three cycles is configured to raise a temperature of the recording layer to a level above a melting point in order to record a mark.