US 11,335,370 B2 · Positioning method and device for hologram in card-type holographic storage medium

Abstract

The invention relates to a positioning method and device for a hologram in a card-type holographic storage medium, which can be used for beam positioning of cross-shift multiplexing and belong to the technical field of optical holographic storage. A guide groove in a grid shape is engraved on a card-type storage medium, and is provided with positioning markers. Each marker includes position information and direction information, can control an optical head to move along the guide groove, and shift multiplexing/reproducing is performed when recognizing the positioning markers. Since the card-type medium is adopted, a 90-degree rotation can be executed three times, and a total of four times of shift multiplex recording is performed. Random access can be achieved even in a medium that is rotated and used by adopting the positioning method and device described in the present invention.

Claims17

Dependent claims

A positioning method for a hologram in a card-type holographic storage medium, comprising recording a guide groove on a recording area of a card-type storage medium in a manner of two-dimensional grid pattern in order to achieve cross-shift multiplex recording, wherein the guide groove is in a two-dimensional grid shape and is provided with markers, each marker is located at a crossing of the two-dimensional grid, each marker includes at least optical track information and sector information, and the positioning method further comprises positioning the recording/reproducing beam to a target marker according to the optical track information and the sector information.

A positioning method for a hologram in a card-type holographic storage medium used to position a recording/reproducing beam when recording/reproducing the hologram, comprising taking markers provided on a guide groove of a storage medium as starting positions of recording/reproducing, positioning the recording/reproducing beam firstly with a positioning beam detection marker when recording/reproducing is performed, and performing shift multiplex recording/reproducing when detecting the marker,

wherein the guide groove is in a two-dimensional grid shape, each marker is located at a crossing of the two-dimensional grid, each marker includes at least optical track information and sector information, the positioning method further comprises positioning the recording/reproducing beam to a target marker according to the optical track information and the sector information.

A positioning device for a hologram in a card-type holographic storage medium, comprising:

a first optical system for recording/reproducing information;
a translation stage for supporting translation of a storage medium that is engraved with a guide groove in a recording/reproducing area thereof, and markers are provided on the guide groove;
and
a second optical system for generating a positioning beam that is used to position a recording/reading beam generated by the first optical system,
wherein a recording/reproducing beam and the positioning beam act on the same position of the storage medium, and recording/reproducing of the hologram is performed by adopting the positioning beam to position the recording/reproducing beam at a specific position of the storage medium, and
wherein the guide groove is in a two-dimensional grid shape, each marker is located at a crossing of the two-dimensional grid, each marker includes at least optical track information and sector information, and the recording/reproducing beam is positioned to a target marker according to the optical track information and the sector information by the positioning beam generated by the second optical system.

3 more elements

Dependencies are inferred from the claim text.

Positioning method and device for hologram in card-type holographic storage medium

Life of this patent

Positioning method and device for hologram in card-type holographic storage medium

Life of this patent

Abstract

Claims17