Patent ID: 6507548
Filing Date: 2003-01-14
Classification: G11B

Abstract:
An optical pickup device comprising:a light source for emitting light; a beam splitter installed on an optical path of the light emitted from the light source for splitting the light; an objective lens for focusing a main light split by the splitter on an optical recording medium; a monitoring photodetector for receiving a sub-light split by the beam splitter and monitoring the amount of light output from the light source; a main photodetector for receiving the light emitted from the light source and reflected by the optical recording medium and passing through the beam splitter and detecting an error signal and an information signal; and a collimating lens installed on the optical path between the light source and the beam splitter for focusing both the main light and sub light split by the beam splitter, so that the amount of light received by the monitoring photodetector increases, wherein a radiation angle of the main light and sub-light passing through the collimating lens is 4Â°-6Â°.