Patent ID: 7995446
Filing Date: 2011-08-09
Classification: G02B,G11B

Abstract:
1. An optical element for an optical pickup apparatus, the optical element comprising: a first area including an optical axis of the optical element; and a second area surrounding the first area and comprising a diffractive structure in a radial shape, wherein the optical elements is used for the optical pickup apparatus which records or reproduces information by converging at least a light flux with a wavelength λ wherein the first area transmits a light flux from the light source, and the second area diffracts a light flux with the wavelength λ wherein the optical pickup apparatus records or reproduces information by converging a first light flux with a first wavelength λ wherein the first area transmits the first light flux and the second light flux, and the second area transmits the first light flux and diffracts the second light flux.