The invention relates to a focusing redactor for a rocker CD pickup, comprising: a collimating lens arranged on the light path of an object lens and control the focusing; a collimating lens guide device made of magnet and composed of the three partsa collimating lens installation seat, an elastic support device for elastically supporting the collimating lens installation seat to make it able to move to the object lens, and a guide fixed device fixed at the tail end of the rocker to support the elastic support device; and a focusing coil able to provide magnetic force for the collimating lens guide device and installed on a CD-ROM. The invention can actively control the focusing, almost not increasing the inertia moment of the rocker, thus able to firmly control tracking servo. |