Patent ID: 6937554

Claim:
An optical pickup apparatus for accessing an optical recording medium, comprising: a light source unit emitting one of a plurality of laser beams having different wavelengths, the light source unit including a first laser diode emitting a laser beam having a first wavelength and a second laser diode emitting a laser beam having a second wavelength; an optical system focusing said one of the plurality of laser beams, emitted by the light source unit, onto a recording surface of the recording medium; a photodetector unit receiving reflection beams, which are reflected from the recording medium in response to said one of the plurality of laser beams focused by the optical system, to generate detection signals from the received reflection beams; and a holographic unit having a first hologram suited to the first laser diode and a second hologram suited to the second laser diode, the first hologram provided to diffract a reflection beam of the laser beam of the first laser diode to the photodetector, the second hologram provided to diffract a reflection beam of the laser beam of the second laser diode to the photodetector, wherein one of the first and second holograms in the holographic unit includes a first tracking detection region suited to the reflection beam of the laser beam of the first laser diode, and a second tracking detection region suited to the reflection beam of the first leaser diode, and a second diode, and a surface area of the second tracking detecting region being larger than a surface area of the first tracking detection region.