Patent ID: 6272097
Filing Date: 2001-08-07
Classification: G11B

Abstract:
An optical head comprising:a light beam source;a light beam focusing element for focusing and applying a light beam radiated from said light beam source onto an information recording medium;a phase difference generating element for generating a predetermined phase difference to a light beam from said light beam source and the light beam reflected on said information recording medium;a light beam separating element for separating the light beam reflected on said information recording medium into fluxes of light;one or more photo detector elements for detecting an information signal recorded on said information recording medium in response to said reflected light; andwherein said light beam source is integrated on the same substrate as said photo detector element and said light beam source is a semiconductor laser having a vertical resonator formed against a light waveguide structure having an active layer on the side of semiconductor crystal vertically formed on said substrate.