Patent ID: 6611383
Filing Date: 2003-08-26
Classification: G11B

Abstract:
An optical pickup apparatus for minimizing astigmatic aberrations, comprising:a first light source and a first light detector placed separately; a first wedge-shaped beam splitter placed at a light path of divergent or convergent light and having a first side opposing a second side; a second light source placed apart from said first light source; a second wedge-shaped beam splitter, placed at a light path of divergent or convergent light and at an intersection of light beams emitted by said second light source and light beams passing through said first wedge-shaped beam splitter, said second wedge-shaped beam splitter having a first side opposing a second side; a beam focuser to focus light beams passing through said second wedge-shaped beam splitter toward an optical recording medium; and a hologram pick-up module including said second light source and a second light detector, wherein said first light detector receives a light reflected from said first wedge-shaped beam splitter, and said second light detector receives a light reflected from said second wedge-shaped beam splitter, and wherein said first and second sides of each of said first and second wedge-shaped beam splitters are not parallel to each other.