Patent ID: 6584060
Filing Date: 2003-06-24
Classification: G02B,G11B

Abstract:
An optical pick-up device for recording/reading information on an optical recording medium, comprising:a light source for emitting a light beam; an optical system having a converging function for the light beam, through which the light beam converges on a recording surface of the optical recording medium, and through which the returning light beam that is reflected by the recording surface is collected and converges; a diffraction component for diffracting the returning light beam that is reflected by the recording surface; an optical member having a prism-like transparent body physically separated from the diffraction component, which is disposed in an optical path between the diffraction component and the light source, and through which the light beam is provided to the diffraction component; a reflective optical surface formed on the optical member, which reflects the diffracted returning light beam; a photodetector unit for detecting the diffracted returning light beam that is reflected by the reflective optical surface.