Patent ID: 7898914

Claim:
An optical disk recording apparatus for forming a visible image on an optical disk in which one tangential direction of the optical disk is determined as a reference angle position, the optical disk recording apparatus comprising: an irradiating unit that irradiates a laser beam to the optical disk; a rotating unit that holds and rotates the optical disk; an angle signal output unit that outputs a pulse signal of a frequency responsive to rotation of the rotating unit; a reference angle position detector that detects the reference angle position of the optical disk based on an optical signal reflected by the optical disk; a first counter that counts the number of edges of the pulse signal during one revolution as a count value; a second counter that measures a time which elapses from one edge to a next edge of the pulse signal as a measurement value; a saving unit that saves the count value acquired by the first counter at a point in time when the reference angle position detector detects the reference angle position and the measurement value acquired by the second counter at the same point in time; and a recording unit that commences operation for forming the visible image on the optical disk with reference to a point in time when the count value of the first counter and the measurement value of the second counter become equal to the values saved by the saving unit.