Patent ID: 7277377

Claim:
An optical pick-up device comprising: a light source configured for emitting a linear polarized light beam with a first type of polarized component and a second type of polarized component; a polarized light beam converter configured for converting the first type of polarized component of the linear polarized light beam into the second type of polarized component, the polarized light beam converter comprising a first micro lens array, a birefringent crystal, a second micro lens array located between the first micro lens array and the birefringent crystal, and a plurality of half-wave plates mounted on a surface of the birefringent crystal; each lens of the second micro lens array being a concave lens; a first splitter configured for partially transmitting and partially reflecting the linear polarized light beam with the second type of polarized component; a first collimating lens configured for converging the transmitted linear polarized light beam with the second type of polarized component onto an optical disc; and a photo-detector configured for receiving a corresponding light beam reflected by the optical disc.