Patent ID: 7948856

Claim:
A method of manufacturing an optical pickup apparatus, comprising steps of: preparing plural different types of objective lenses having respective different optical path difference providing structures designed based on respective different design wavelengths; selecting one type objective lens from the plural different types of objective lenses in accordance with an oscillation wavelength of a laser light source; and assembling the selected type objective lens and the laser light source into the apparatus, wherein the selected type objective lens is made of a plastic, is provided with the optical path difference providing structure on at least one surface thereof and satisfies the following expression: 0.01≦|δ SA 3 obj /δλ|<0.01(λrms/nm) where δSA3 obj /δλ represents the wavelength dependency of the 3rd order spherical aberration of the objective lens when an oscillation wavelength is fluctuated between ±2nm from a reference wavelength of 500 nm or less.