Hitachi-LG Data Storage Assigned Patent

Hitachi-LG Data Storage, Inc., Tokyo, Japan , has been assigned a patent (9,841,731) developed by Utsugi, Takeru, and Yamazaki, Kazuyoshi, Tokyo, Japan, for a “holographic memory device.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “To reduce an influence of stray light and stably record/reproduce high-quality data in holographic recording/reproduction. A holographic memory device includes an optical system that guides a reference beam to an optical information recording medium at a desired angle of incidence, a control part that controls the angle of incidence of the reference beam generated in the optical system, and a lens part that images the reference beam in a desired position of the optical information recording medium. Further, at least a first light beam at a first angle and a second light beam at a second angle different from the first angle are output from the optical element, and the optical element is provided so that the first light beam may propagate within an effective diameter of the lens part and the second light beam may propagate to an outside of the effective diameter of the lens part.”

The patent application was filed on August 3, 2015 (14/816,441).