| 摘要 |
PROBLEM TO BE SOLVED: To provide an integrated unit and an optical pickup device capable of detecting a DPP signal controlling the occurrence of a track offset. SOLUTION: The unit and the device are provided with an LD chip 3 exiting a laser beam, a diffraction grating 7 dividing the exited laser beam into the plural, a hologram 6 in which an optical disk is irradiated with a plurality of laser beams and which guides light by diffracting reflected light from the optical disk, and a photodetector 4 which receives light diffracted by the hologram 6. Light quantities of ±1st order diffracted light diffracted by the diffraction grating 7 are unbalanced. |
