Patent ID: 7315503

Claim:
An optical pick-up device for reading information from and recording information on an optical disc comprising: at least one micromirror array lens, wherein the micromirror array lens is a reflective Fresnel lens including a plurality of micromirrors each with two rotational degrees-of-freedom motion and one translational degree-of-freedom motion, wherein the two rotational degrees-of-freedom motion are controlled to deflect light to a focal point and the one translational degree-of-freedom motion is controlled to meet phase matching conditions and to correct a phase error of the light, and wherein the three degrees-of-freedom motion of the micromirrors in the micromirror array lens are adjustable to vary a focal length of the micromirror array lens while satisfying a converging condition by the rotational degrees-of-freedom motion and the phase matching conditions by the translational degree-of-freedom motion of the micromirrors in the micromirror array lens.