Objective lens for optical recording medium and optical pickup apparatus

摘要

An objective lens for an optical recording medium comprises two lenses each having a positive refracting power disposed within a laser luminous flux having a wavelength of 360 to 450 nm outputted from a laser diode. The two lenses have at least one diffractive optical surface and at least one aspheric surface, and are set so as to have a total NA of at least 0.7.