Patent ID: 8077582
Filing Date: 2011-12-13
Classification: B82Y,G11B

Abstract:
1. An optical pickup comprising: a semiconductor laser to sequentially emit, as laser light, specific peak light having first light intensity characteristics in a pulse shape and specific slope light having second light intensity characteristics in a slope shape, the specific slope light having a light intensity lower than the specific peak light and a wavelength differing from that of the specific peak light, when a driving pulse in a pulse shape and at a predetermined specific voltage is supplied; a divergence angle differing unit to cause axes or divergence angles in the specific peak light and the specific slope light to differ from each other in accordance with the wavelength of the laser light; and an objective lens to form, in a recording layer of an optical disc, a recording mark by collecting the specific peak light so as to cause a first reaction to occur in a first area in a vicinity of a focal point thereof and thereafter by collecting the specific slope light at a same focus position as that of the specific peak light so as to cause a second reaction to occur in a second area in which the specific slope light is irradiated within the first area in which the first reaction has occurred.