OPTICAL PICKUP DEVICE COMPRISING AN ACHROMATIC PRISM, PARTICULARLY IN CONNECTION WITH FORMING A LIGHT SOURCE EMITTED TO TWO OPTICAL SHAFTS INTO ONE OPTICAL SHAFT WITHOUT COLOR DISPERSION

摘要

PURPOSE: An optical pickup device comprising an achromatic prism is provided to compensate for an optical shaft by using an achromatic prism, thereby omitting another optical part such as an HOE(Holographic Optical Element) or a wedge beam splitter, consequently a structure of an optical pickup can be simplified. CONSTITUTION: A luminous element(100) generates at least more than two lights having different wavelengths. An objective lens(102) focuses each light emitted from the luminous element(100) upon an optical disk(D). A light receiving element(104) receives each light reflected from the optical disk(D). A beam splitter(106) is installed on an optical path of the luminous element(100) and the objective lens(102). A collimator lens(108) collimates a light whose path is converted.