Patent ID: 6993825
Filing Date: 2006-02-07
Classification: G11B,Y10T

Abstract:
1. A tilt adjusting method for a recording medium driving apparatus, the recording medium driving apparatus including at least a turntable for rotationally driving a recording medium that has been mounted, a spindle motor for driving the turntable, a head apparatus for performing recording and/or reproduction for the recording medium, and linear driving means for moving the head apparatus in a straight line, the linear driving means including at least a nut that is attached to the head apparatus, a feed screw onto which the nut is screwed, a feed motor for driving the feed screw, and first and second guide shafts that are disposed parallel to one another on both sides of the head apparatus and guide the head apparatus, the tilt adjusting method (i) providing, on a surface of the turntable on which the recording medium is mounted, a reflective substrate including a flat mirror that is parallel with and above the surface, (ii) using a skew angle adjusting jig and an auto-collimator, the skew angle adjusting jig including an optically flat substrate with an optically flat surface and three mounting surfaces that are parallel with the optically flat surface, and (iii) comprising a first step and a second step, wherein in a state where two mounting surfaces out of the three mounting surfaces of the skew angle adjusting jig are mounted onto both ends of the first guide shaft and a remaining mounting surface is mounted on one end of the second guide shaft, the first step shines a parallel beam from the auto-collimator in a perpendicular state onto both the flat mirror, which is rotated by the turntable, and onto the optically flat surface, has reflected light from the flat mirror and reflected light from the optically flat surface return to the auto-collimator, adjusts, with a height of one end of the first guide shaft as a standard, a height of another end of the first guide shaft so that a tilt of the first guide shaft in the a radial direction matches the tilt of the flat mirror, and next adjusts, with the height of one end of the first guide shaft or an adjusted height of another end of the first guide shaft as a standard, a height of one end of the second guide shaft so that a tilt of the first guide shaft in a tangential direction matches the tilt of the flat mirror, and in a state where two mounting surfaces out of the three mounting surfaces of the skew angle adjusting jig are mounted onto both ends of the second guide shaft and a remaining mounting surface is mounted on one end of the first guide shaft, the second step shines a parallel beam from the auto-collimator in a perpendicular state onto both the flat mirror, which is rotated by the turntable, and onto the optically flat surface, has reflected light from the flat mirror and reflected light from the optically flat surface return to the auto-collimator, and adjusts, with an adjusted height of one end of the second guide shaft as a standard, a height of another end of the second guide shaft so that a tilt of the second shaft in a radial direction matches the tilt of the flat mirror.