Hea-jung Suh

Optical pickup using a single light spot to generate tracking error signal and reproduction signal

Optical pickup device having chromatic aberration correction lens

Aberration correction element and optical pickup adopting the same

Compatible optical pickup for high-density recording/reproduction

Optical pickup for recording/reproducing optical discs of multiple thicknesses

Aberration compensating element and optical pickup device incorporating this element

Optical pickup for improving properties of a reproduction signal

Spherical abberation compensator and optical pickup using the same

Optical pickup for and method of correcting aberration due to thickness variations of optical media

Optical pickup with improved collimating lens for use with long and short wavelength laser beams