Patent ID: 7929402

Claim:
An optical pickup comprising: a beam guiding section to combine a first beam and a second beam to lead the first and second beam to an objective lens, and lead a first reflection beam, representing information, or a reflection of the first beam from an optical information recording medium, along a first optical path that the first beam traveled and a second reflection beam, or a reflection of the second beam from a reflection layer, along a second optical path that the second beam traveled; a first beam receiving section to receive the first reflection beam based on the first reflection beam; a first beam separating section to separate the first reflection beam from the first optical path and lead the first reflection beam to the first beam receiving section; a second beam receiving section to receive the second reflection beam; and a second beam separating section to separate the second reflection beam from the second optical path and lead the second reflection beam to the second beam receiving section, wherein the objective lens drive section drives the objective lens according to the result of receiving the beam by the second beam receiving section; the objective lens to collect the first beam and the second beam whose wavelength is different from the first beam and emit the first and second beam toward the optical information recording medium on which information can be recorded as a recording mark as a result of being exposed to the first beam whose intensity is greater than or equal to a predetermined level; the objective lens drive section to drive the objective lens to focus the second beam on the reflection layer formed on the optical information recording medium, the reflection layer at least partly reflecting the second beam; and the focal point shifting section to change a convergence state of the first beam to position a first focal point of the first beam a certain distance away from a second focal point of the second beam in the direction of depth along which the objective lens moves close to or away from the optical information recording medium in order to place the first focal point of the first beam at a target depth that should be exposed to the first beam.