Patent ID: 6608802
Filing Date: 2003-08-19
Classification: G11B

Abstract:
An optical disk drive comprising:a spindle motor for rotating an optical disk; a laser source for generating a light beam; an optical head having an objective lens to converge the light beam onto a recording portion of the surface of the optical disk, a lens holder to hold the objective lens, a plurality of elastic support members to elastically support the lens holder, and a fixing part to fix the elastic support members, wherein the fixing part, the plurality of elastic support members and the optical head operatively dispose a front of the objective lens at a working distance from the surface of the optical disk, the working distance variable between a first working distance, W.D.1, and a second working distance, W.D.2, wherein the optical head operatively disposes the objective lens at a distance, L holder, being the distance between the front of the objective lens and a center of a plurality of fixing points of the elastic support members on the lens holder in a focusing direction orthogonal to the radius of the optical disk, wherein the fixing part is operatively disposed at a distance, L wire, being the distance between the surface of the optical disk and a center of a plurality of fixing points of the elastic support members on the fixing part in the focusing direction, C wire, wherein the lens holder is disposed in a direction orthogonal to the radius of the optical disk and receding from the surface of the optical disk a distance, d, being the distance the plurality of elastic support members are biased by a weight of the lens holder in a state that the disk drive is placed substantially horizontally; and a slider for moving the optical head in a radius direction of the optical disk; wherein the objective lens, the lens holder, the plurality of elastic support members and the fixing part are disposed to satisfy the relation: (W.D.1+W.D.2)/2+L holderâˆ’d<=L wire<=(W.D.1+W.D.2)/2+L holder.