| 摘要 |
The invention relates to an optical pickup apparatus comprising a photodetector ( 302 ) which comprises a first segment (A) and a second segment (B), and an optical element ( 301 ) intended to receive an incident light beam, said optical element ( 301 ) comprising:-a first portion (L) comprising diffraction means for generating a first 0th diffraction order light beam (A(0)) on said first segment (A), and a first non-0th diffraction order light beam (B(+1)) on said second segment (B),-a second portion (R) comprising diffraction means for generating a second 0th diffraction order light beam (B(0)) on said second segment (B), and a second non-0th diffraction order light beam (A(+1)) on said first segment (A) Use: Optical pickup apparatus
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