Guide shaft height adjustment mechanism and disc drive equipped with the adjustment mechanism

Abstract

A guide shaft height adjustment mechanism () used in a disc drive includes: a chassis () comprised of a chassis base having a flat-plate shape and a hole; a guide shaft () for guiding an optical pick-up along a radial direction of an optical disc, the guide shaft having one end acting as a movable end and being mounted on the chassis base so that the movable end can be displaced in a direction perpendicular to the chassis base; an adjustment member () rotatably provided at the vicinity of the movable end of the guide shaft (), the adjustment member () being formed by outsert molding at the position of the hole formed in the chassis base (); and a biasing member () provided between the chassis base () and the guide shaft () at the vicinity of the adjustment member () for pushing the guide shaft () to a direction far away from the chassis (). The adjustment member has an abutment surface () at the vicinity of the movable end of the guide shaft (), the abutment surface faces the chassis base so that the guide shaft () is abutted thereto, and the abutment surface is formed so as to be inclined relative to the chassis base and along the circumferential direction of the adjustment member (), in which the movable end of the guide shaft is in abutment with the abutment surface by the biasing force of the biasing member, and the distance between the movable end of the guide shaft and the base chassis can be adjusted by rotating the adjustment member.