An optical information recording and reproducing device

G - Physics – 11 – B

Patent

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G11B 7/00 (2006.01) G11B 7/135 (2006.01)

Patent

CA 2088188

An optical information recording and reproducing device is provided. The device includes a light source for emitting a light beam, a first diffraction element for splitting the light beam into at least three diffracted beams, an optical system guiding the diffracted beams to a recording medium, and a second diffraction element including at least one division line and a diffraction surface from which the diffracted beams are diffracted. The diffraction surface is divided into at least two regions by the division line or lines. One of the division lines is at a predetermined angle against the direction of a track on the recording medium, and the regions split each of the diffracted beams into at least two parts to diffract the parts in different directions. The device also includes an optical detecting element for detecting the light beams diffracted with the second diffraction element.

La présente invention a pour objet un dispositif d'enregistrement optique et de reproduction de l'information. Le dispositif en question comporte une source lumineuse pour l'émission d'un faisceau lumineux, une premier élément de diffraction pour fractionner le faisceau lumineux en au moins trois faisceaux diffractés, un système optique pour guider les faisceaux diffractés vers un support d'enregistrement, et un deuxième élément de diffraction comportant au moins une ligne de division et une surface de diffraction d'où les faisceaux diffractés sont diffractés. La surface de diffraction est divisée en au moins deux régions par la ou les lignes de division. Une des lignes de division forme un angle prédéterminé par rapport à la direction d'une piste sur le support d'enregistrement et les régions séparent chacun des faisceaux diffractés en au moins deux parties pour diffracter les parties dans différentes directions. Le dispositif en question comporte également un élément de détection optique pour détecter les faisceaux de lumière diffractés par le deuxième élément de diffraction.

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