Patent ID: 7782734
Filing Date: 2010-08-24
Classification: G11B

Abstract:
1. An optical pickup, which is compatible with different types of media, comprising: first through third light sources for emitting lights with different wavelengths, respectively; light path changers for changing the respective paths of light emitted by the plurality of light sources; an objective lens for condensing the incident light from the light path changers onto a recording medium; a single collimating lens that does not include more than one lens, the collimating lens being disposed to collimate the incident lights from all light sources, and to output collimated light directly to the objective lens, the collimating lens being movable to correct a spherical aberration; and a diffractive optical element disposed in a path of a light having a short wavelength, the diffractive optical element having a diffractive surface for correcting a chromatic aberration.