Optical recording medium reading device

Details Optical recording medium reading device Optical recording medium reading device

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G11B 7/135 (2006.01) G02B 5/18 (2006.01) G02B 5/30 (2006.01) G02B 27/28 (2006.01) G11B 7/08 (2006.01) G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1301319

ABREGE DISPOSITIF DE LECTURE OPTIQUE DE SUPPORT D'ENREGISTREMENT OPTIQUE Dispositif de lecture optique support d'enregistrement, dans lequel un séparateur de faisceau (2) comporte une lame transparente munie d'un réseau de phase induisant un effet d'astigmatisme dans le faisceau qui le traverse. Les dispositifs de détection (6, 7) sont placés sensiblement selon l'axe d'émission (YY') de la source optique (1) et permettent de détecter cet astigmatisme. Ce dispositif est applicable notamment à la lecture des disques optiques. Figure 8.

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