Patent ID: 6798727
Filing Date: 2004-09-28
Classification: G11B

Abstract:
An optical pickup apparatus comprising:a plurality of light emission sources adapted to emit light beams having different wavelengths, respectively; a control unit for controlling the light emission sources to adjust the light beams to a predetermined intensity; a reflective mirror having a first surface on which the light beams are incident and a second surface, the reflective mirror adapted to reflect each of the light beams emitted from the light emission sources in a direction perpendicular to an incident direction of the light beam at a predetermined reflectance and to transmit the light beam to the second surface at a predetermined transmittance; a beam splitter disposed between the light emission sources and the reflective mirror, the beam splitter adapted to transmit or reflect the light emitted from the light emission sources; and a photodetection unit disposed in a second surface direction with respect to the reflective mirror, the photodetection unit adapted to detect the light beam transmitted by the reflective mirror, wherein an information recording medium is disposed in the direction different from the incident direction, and the control unit controls the light emission sources based on a detection output of the photodetection unit.