Shanghai Institute of Optics and Fine Mechanics/Chinese Academy of Sciences Assigned Patent

Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China, has been assigned a patent (11,227,632) developed by Ruan, Hao, Hu, Qiao, Yuan, Xupeng, and Guo, Xinjun, Shanghai, China, for “radial servo device for super-resolution optical disc and servo control method therefor.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A radial servo control device for a super-resolution optical disc includes an excitation light source, a servo light source, an integrated optical path, focusing units, a servo light detecting unit and a drive control unit, the drive control unit presets N detection error reference values with respect to each guide layer trench irradiated by servo light, and controls corresponding positions of the focusing units in N data tracks below each guide layer trench according to a comparison result between a detection result of servo reflected light and the detection error reference values. The device is applicable to a variety of super-resolution optical discs on the basis of stimulated radiation loss microscopy technology, a two-photon absorption technology, and the like, and achieves accurate radial servo control of super-resolution data tracks (<100 nm) without reducing the wavelength of servo light and the width of guide layer trenches.”

The patent application was filed on April 16, 2019 (17/050,271).