Patent ID: 7289416
Filing Date: 2007-10-30
Classification: G11B

Abstract:
1. An optical pickup, comprising: a CD laser beam source for irradiating a CD laser beam; a DVD laser beam source for irradiating a DVD laser beam; a composite prism for transmitting the CD laser beam, reflecting the DVD laser beam, and creating a composite of the transmitted CD laser beam and the reflected DVD laser beam to irradiate the composite laser beam coaxially along an optical axis; and a collimator lens for collimating the laser beam from the composite prism, wherein an optical film is formed on a composite plane of the composite prism, the optical film having reflection characteristics such that a reflection rate of the DVD laser beam is minimized for a DVD laser beam incoming at an optical axis incident angle, and that concentration of the DVD laser beam at a central portion relative to the concentration of the DVD laser beam at a peripheral portion is reduced.