Patent ID: 7289415

Claim:
An optical pickup apparatus, comprising: a first light source emitting a first light flux having a wavelength of λ 1 , which satisfies 380 nm≦λ 1 ≦450 nm, the first light source being utilized for recording information on and/or for reproducing information from a first optical information recording medium having a first protective substrate having a thickness of t 1 on an information recording surface; a second light source emitting a second light flux having a wavelength of λ 2 , which satisfies 600 nm≦λ 2 ≦700 nm, the second light source being utilized for recording information on and/or for reproducing information from a second optical information recording medium having a second protective substrate having a thickness of t 2 , which satisfies t 1 ≦t 2 , on an information recording surface; a third light source emitting a third light flux having a wavelength of λ 3 , which satisfies 750 nm≦λ≦800 nm, the third light source being utilized for recording information on and/or for reproducing information from a third optical information recording medium having a third protective substrate having a thickness of t 3 , which satisfies t 2 <t 3 , on an information recording surface; a first divergent angle-converting element, through which at least the first light flux passes; a second divergent angle-converting element, through which at least the second light flux and the third light flux passes; and an objective optical element, through which the first light flux, the second light flux and the third light flux pass, wherein m 2 , which is an optical magnification of the second divergent angle-converting element for the second light flux, is different from m 3 , which is an optical magnification of the second divergent angle-converting element for the third light flux.