| 摘要 |
An optical pickup apparatus in which a plurality of light sources emitting a plurality of light beams whose wavelengths are different from each other and degree of reliability of signals detected by a photodetector is high, a method of controlling the same, and an information recording and reproducing apparatus are provided. An objective lens, a lambda/4 plate and a polarizing element whose outer edge portion is formed of a polarizer are formed integrally, which polarizing element is disposed so as to serve as an aperture stop with respect to a return light beam having a shorter wavelength.
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