An optical disk drive includes a mounting plate, a guide bar, a fixing structure
for positioning the guide bar on the mounting plate, and a pickup head guided by
the guide bar and moveable along a lengthwise direction of the guide bar. The fixing
structure includes a fixed joint and a flexible pressure-providing joint. The fixed
joint rigidly fixes one end of the guide bar to the mounting plate, the flexible
pressure-providing joint positions another end of the guide bar on the mounting
plate, and the two ends of the guide bar are fixed in their relative positions
due to a flatness of the mounting plate and despite a positioning action of the
fixing structure such that linear movement of the pickup head is guided by the
guide bar.
