OPTICAL PICKUP ELEMENT

摘要

An optical pickup device having a semiconductor laser element 950 mounted on a substrate (2), a photo detector (3) formed on the substrate to receive a laser beam emitted from the semi-conductor laser element (2) and an optical element (6) mounted on the substrate to cover the photo detector to branch the direction of optical path of the laser beam. The optical element (6) is adapted to reduce the amount of unwanted stray light from the laser (5) reaching the photo detector (3). The element (6) has its face (6a) opposing the semi-conductor laser element (5) formed as an inclined face on which a semi-transparent reflection film is deposited. The optical path branching optical element is provide with preventing means (9) by which, of laser beams incident on the optical element (6), a laser beam reflected and/or scattered within the optical element (6) is prevented from irradiating the photo detector (3).