Patent ID: 8009524
Filing Date: 2011-08-30
Classification: G11B

Abstract:
1. An optical pickup apparatus comprising; a first lens unit including a first objective lens and a high-refraction lens; a second lens unit including a second objective lens; and at least one separating/combining unit for separating or combining paths of an optical signal passing through the first or second lens unit, wherein there is a height difference between the first lens unit and the second lens unit, wherein the height difference is decided in consideration of a physical tilt limitation angle or a vibration range during a recording/reproducing operation, wherein the physical tilt limitation angle is calculated by the following equation, wherein a bottom radius at a lower part of the high-refraction lens is r and an interval between the high-refraction lens and a recording medium is d, wherein the vibration range is limited to maximum of 0.1 mm.