| 摘要 |
PROBLEM TO BE SOLVED: To provide an apparatus and a method, for the measurement of the characteristic of a face shape, wherein the characteristic regarding the surface shape of the face, to be measured, of a disk body such as the signal recording face or the like of an optical disk can be measured precisely and efficiently. SOLUTION: The measuring apparatus is provided with a laser Doppler speedometer 11 which detects the speed in the vertical direction of the face, to be measured, of the disk body being turned. The measuring apparatus is provided with an angle-of- inclination calculation part 61 in which an angle of inclinationβin the rotation direction with reference to a reference face in each measuring position of the optical disk D is calculated on the basis of a linear speed in each measuring position by the speedometer 11 and on the basis of the detected speed in the vertical direction, The measuring apparatus is provided with a displacement calculation part 60 which calculates a displacement in the vertical direction in each measuring position of the optical disk D. The measuring apparatus is provided with an acceleration calculation part 59 which calculates an acceleration in the vertical direction. The measuring apparatus is provided with a tracking-error-amount calculation part 58 which calculates a tracking error amount which is estimated to be generated in a focus servo system.
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