Patent ID: 8199616
Filing Date: 2012-06-12
Classification: G11B

Abstract:
1. A method for assembling an optical pickup apparatus comprising, a first light source for emitting first light beams having wavelength of λ a second light source for emitting second light beams having wavelength of λ a third light source for emitting third light beams having wavelength of λ a first objective lens, a second objective lens, a lens holder for holding the first objective lens and the second objective lens, an actuator for supporting the lens holder and driving the lens holder, and an actuator base for supporting the actuator, wherein the first light beams from the first light source are applied to record and/or reproduce information onto/from a first optical information recording medium by converging the first light beams onto an information recording surface of the first optical information recording medium through a protective layer having thickness of t wherein the second light beams from the second light source are applied to record and/or reproduce information onto/from a second optical information recording medium by converging the second light beams onto an information recording surface of the second optical information recording medium through a protective layer having a thickness of t wherein the third light beams from the third light source are applied to record and/or reproduce information onto/from a third optical information recording medium by converging the third light beams onto an information recording surface of the third optical information recording medium through a protective layer having a thickness of t wherein the optical pickup apparatus is used in an optical information recording-reproducing apparatus having a relative tilt angle changing device for changing a relative tilt angle formed between the optical information recording medium and one of the first and second objective lenses of the optical pickup apparatus; wherein the relative tilt angle changing device is arranged to be able to control a coma aberration associated with light beams converged onto the recording surface of the optical information recording medium by changing the relative tilt angle formed between the optical information recording medium and one of the first and second objective lenses; wherein the first objective lens is designed based on an image height priority design method against the first light beams, the image height design method being a design method for correcting a spherical aberration and a sine condition; wherein the second objective lens is designed based on a tilt angle priority design method against the second light beams, the tilt angle priority design method being a design method for correcting the spherical aberration while not correcting the sine condition; and wherein the second objective lens is designed based on the image height priority design method against the third light beams, the method for assembling the optical pickup apparatus comprising the steps of: