OPTICAL PICKUP DEVICE

摘要

The aberration takes place according to the height of the image because the laser light tilts from the optical axis when it enters to the object lens in the optical pickup device which is equipped with a laser diode for BD and the monolithic laser diode capable of irradiating laser lights with two different wavelengths for DVD and CD as one package to read the signal by single object lens and single optical system. This is because the light sources of the three lights with different wavelengths are away from each other in the optical pickup device. The emission point of the laser diode for BD is formed at the location shifted from the center of the chip. The laser diode for BD is disposed adjacent to the monolithic laser diode capable of irradiating laser lights with two wavelengths for DVD and CD to make the emission point closer to the monolithic laser diode. The sizes of these two laser diodes is minimized by employing half dicing during the cleavage processing for separating the chips. Therefore, the distance among the emission points can be reduced even with the configuration where two laser diodes are disposed on the substrate in lateral.