Patent ID: 7990833

Claim:
An optical pickup device comprising: a light source emitting light at a designated wavelength; an object lens concentrating the light incident from the light source thereupon and forming an optical spot on an optical disk having multiple recording layers; and an optical detector receiving the light reflected by the optical disk and detecting a data signal and an error signal, wherein at least one diffraction pattern region partially diffracting or intercepting the light emitted from the light source and being incident upon the object lens, and the light, reflected by the optical disk and being incident upon the object lens, is formed on the object lens at a central portion of the object lens, wherein the at least one diffraction pattern region is formed on at least one of a convex surface of the object lens, upon which the light emitted from the light source is incident, and a flat surface of the object lens, upon which the light reflected by the optical disk is incident, and wherein P-polarized and S-polarized light-intercepting diffraction patterns intercepting both P-polarized light and S-polarized light are formed on the at least one diffraction pattern region.