Optical pickup device applicable to two kinds of recording media with minimized deterioration of a beam spot

An optical pickup device applicable to both a first optical recording medium and a second optical recording medium, the second optical recording medium having a thickness larger than a thickness of the first optical recording medium, the optical pickup device comprising:

• a first light source used for said first optical recording medium, said first light source emitting a first beam having a first wavelength;
• a Second light source used for said second optical recording medium, said second light Source emitting a second beam having a second wavelength;
• an objective lens converging said first beam and projecting the converged first beam onto said first optical recording medium, said objective lens also converging said second beam and projecting the converged second beam onto said second optical recording medium,
• an optical path guiding unit guiding said first beam and said second beam to the same optical path directed to said objective lens;
• a signal extracting unit for extracting signals from said first and second beams reflected by a selected one of said first optical recording medium and said second optical recording medium;
• a first aperture limiting member limiting said first beam entering said objective lens;
• and
• a second aperture limiting member limiting said second beam entering said objective lens,
• wherein one of said first and second aperture limiting members includes a wavelength selective filter having a wavelength selectivity for separating said first and second beams from each other.