Optical pickup head and information recording and/or reproducing device incorporating same

Abstract

An optical pickup head () for a high density recording and/or reproducing device compatible with three types of optical recording media. The pickup head includes a first light source () emitting first beams with a first wavelength, a second light source () emitting second beams with a second longer wavelength, a third light source () emitting third beams with a third even longer wavelength, a prism unit (), a collimating lens () located beside the prism unit, and an objective lens () for receiving the light beams and transmitting them to the recording media respectively. The prism unit includes a first portion facing the first source and receiving the first beams, a second portion facing the second source and receiving the second beams, a third portion facing the third source and receiving the third beams, and first and second aberration-correcting portions for the second and third beams to pass therethrough.