| 摘要 |
<p>PROBLEM TO BE SOLVED: To compensate the inclination error in the tangential direction of a disc by a method wherein the position of a guide shaft which guides a pickup is shifted within a minute range. SOLUTION: In order to adjust the inclination error in the tangential direction of a disc, a prescribed tool is inserted into a nut groove 425 to turn an upper cam member 420. By this turn, a lower cam member 410 which are coupled with the upper cam member 420 by coupling protrusions 422a and 422b and coupling holes 412a and 412b is also turned. Therefore, a guide shaft 300 which is clamped between the 1st cam surface 411 of the member 410 and the 2nd cam surface 421 of the member 420 ascends/descends in a vertical direction while it slides along both the cam surfaces 411 and 421. The position of a pickup is changed vertically by the vertical movement of the shaft 300 to compensate the inclination error in the tangential direction. At that time, fixing tools 501-504 support the shaft 300 so as not to shake horizontally.</p> |
