Patent ID: 8111486

Claim:
A head gimbals assembly for a hard disk for use in recording information in one or more disks comprising: a plurality of suspensions, each of which is provided with a magnetic head positioned adjacent to a surface of a corresponding disk so as to record/reproduce information; a head gimbals body having a centrally formed pivot hole which allows the head gimbals body to be fitted in such a manner as to be rotatable in relation to the disk, the suspensions extending from one end of the head gimbals body; a coil rotator provided at the other end of the head gimbals body so as to rotate the head gimbals body about the pivot hole; and a laser assembly having at least one laser diode and at least one wave guide, the light emitted from any of the laser diodes being guided to a corresponding magnetic head by the wave guide, wherein the light emitted from anyone of the laser diodes is transferred to two or more disk surfaces by the wave guides, wherein the laser assembly comprises at least one directional coupler for adjusting the direction of the light emitted from a corresponding laser diode, and wherein the directional coupler is formed on a substrate formed of a lithium niobate (LiNb03), which is an optoelectronic material.