Back to results
US 2004/0169908 A1Published application
Optical pickup device
AssigneeSharp Kabushiki Kaisha
InventorsKazuya Kitamura, Yukio Kurata, Tetsuo Iwaki
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSharp Kabushiki Kaisha
InventorsKazuya Kitamura, Yukio Kurata, Tetsuo Iwaki
Estimating the term…
An optical pickup device which includes (A) a light source, and (B) an objective lens and an aberration correcting optical system which are located in a light path from the light source to an optical recording medium is so arranged that the aberration correcting optical system imparts a phase distribution to luminous flux which transmits the aberration correcting optical system, so as to correct a predetermined aberration; and an amount of phase of the aberration correcting optical system when correcting the aberration is set in such a manner that the aberration correcting optical system imparts a larger amount of phase at a position farther from a point where the aberration correcting optical system crosses an optical axis of light emitted from the light source. With this, it is possible to increase a tolerance for the center misalignment of the objective lens so as to reduce aberration caused by the center misalignment.
An optical pickup device comprising:
An optical pickup device comprising an aberration correcting optical element for changing a wavefront of incident light passing through the aberration correcting optical element, the wavefront being an equiphase surface, wherein:
Dependencies are inferred from the claim text.