Patent ID: 7095703

Claim:
A recording apparatus to record a mark on a recording medium, comprising: an aberration detecting part, including a spherical aberration detecting part and a coma aberration detecting part, which detects an aberration signal corresponding to an amount of an aberration contained in a light beam radiated onto a recording surface of the recording medium, using an optical pickup system including a light source that emits the light beam having an optical power to record the mark on the recording medium and an objective lens that condenses the light beam to focus the light beam as an optical spot on the recording surface of the recording medium; and an optical power controller which controls the optical power output from the light source using the aberration signal, so as to have the light source output the optical power to record the mark, in which a deformation due to the aberration is compensated for, on the recording medium, wherein the optical power controller controls the optical power output from the light source so as to apply an optical power P 1 within a range of ±20% of a power γ 1 P 0 to record the mark, where the light source emits the light beam having a wavelength corresponding to a blue light, the numerical aperture of the objective lens is 0.85±0.05, a thickness of the recording medium is 0.1±0.05 mm, and a spherical aberration corresponding to a coefficient W 40 of less than 0.15 occurs, and the power γ 1 P 0 is obtained by multiplying a recording power P 0 of the light source, in which the aberration does not occur, by a compensation coefficient γ 1 which satisfies the relationship: γ 1 =1.9×W 40 +0.91.