Patent ID: 7652246
Filing Date: 2010-01-26
Classification: G11B

Abstract:
1. An optical pickup device comprising: a laser emitting device including a first light emitting portion that emits light of a first wavelength, a second light emitting portion that emits light of a second wavelength, and a third light emitting portion that emits light of a third wavelength, wherein a light emitting position of said first light emitting portion and a light emitting position of said third light emitting portion are approximately on the same position as seen in a direction of an optical axis of emitted light; a light detector, and an optical axis adjusting element for adjusting an optical axis of return light of at least one of said wavelengths among return lights of said first, second and third wavelengths so that respective return lights emitted by said first, second and third light emitting portions of said laser emitting device and reflected by an optical recording medium are received by said light detector, wherein said optical axis adjusting element includes a binary-blazed diffraction grating, and wherein, among lights diffracted by said diffraction grating, zeroth order diffracted lights of return lights of said first and third wavelengths are introduced to said light detector, where signal detection is performed.