Method and apparatus for measuring radial error of rotating...

G - Physics – 11 – B

Patent

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G11B 7/095 (2006.01)

Patent

CA 2392641

An apparatus and method for measuring in real time the eccentric error of a rotating body, particularly an encoded optical disk. An eccentricity measurement pattern comprising a plurality of concentric spaced apart diffraction rings are included on an encoded disk. An error read head with a plurality of laser beams is positoned to reflect laser light off the eccentricity measurement pattern on the disk. The relative radial spacing of the laser beams on the error read head is adjusted to a non-integral multiple of the radial spacing of the diffraction rings. Output signals from the error read head are generated according to reflected laser light from the eccentricity measurement pattern which is detected by the error read head. The output signals are converted to count and direction information.

L'invention concerne un appareil et procédé de mesure en temps réel de l'erreur d'excentricité d'un corps rotatif, notamment d'un disque optique codé. L'invention concerne également un gabarit de mesure d'excentricité comprenant une pluralité d'anneaux de diffraction espacés concentriques sur un disque codé. Une tête de lecture d'erreurs pourvue d'une pluralité de faisceaux laser est positionnée de manière à réfléchir la lumière laser hors du gabarit de mesure d'excentricité sur le disque. L'écart radial relatif des faisceaux laser sur la tête de lecture d'erreurs est ramené à un multiple non entier de l'écart radial des anneaux de diffraction. Les signaux de sortie émis par la tête de lecture d'erreurs sont générés en fonction de la lumière laser réfléchie par le gabarit de mesure d'excentricité détecté par la tête de lecture d'erreurs. Ces signaux de sortie sont transformés en axes et nombres.

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