| 摘要 |
A tilt adjusting method that can precisely adjust the parallelism between a plane on which a recording medium is mounted on a turntable and a plane that is perpendicular to an optical axis of a recording medium apparatus is provided. In a state where two mounting surfaces PN11, PN12 out of the three mounting surfaces of the skew angle adjusting jig J1 are mounted onto both ends of the first guide shaft 32a and a remaining mounting surface PN13 is mounted on one end of the second guide shaft 32b, the first step shines a parallel beam from the auto-collimator in a perpendicular state onto both the flat mirror RB, which is rotated by the turntable, and onto the optically flat surface OF1, has reflected light from the flat mirror and reflected light from the optically flat surface returned to the auto-collimator, and adjusts, with a height of one end of the first guide shaft as a standard, a height of the other end of the first guide shaft so that the reflected light from the flat mirror and the reflected light from the optically flat surface become parallel with one another.
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