Digital signal output device

G - Physics – 08 – C

Patent

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Details

G08C 21/00 (2006.01) G01D 5/347 (2006.01)

Patent

CA 2199230

A digital signal output device including a revolving shaft, a transparent gear wheel fixedly mounted around the revolving shaft and turned by it, the transparent gear wheel having a plurality of teeth alternatively spaced by gaps around the periphery and an annular sloping wall at one side around the center, and a plurality of photoelectric inductors spaced from the periphery of the transparent gear wheel and arranged in parallel, wherein when the transparent gear wheel is turned by the revolving shaft, the light of the light source is projected onto the sloping wall of the transparent gear wheel and reflected radially through the teeth and/or gaps of the transparent gear wheel onto the photoelectric inductors, causing the photoelectric inductors to be or not to be triggered, and therefore the amplification circuit which is connected to the output ends of the photoelectric inductors is driven to provide a digital output signal corresponding to the revolving direction and amount of movement of the revolving shaft.

L'invention est un dispositif de génération de signaux numériques comportant un axe tournant, une roue d'engrenage transparente solidaire de l'axe tournant, cette roue comportant une pluralité de dents sur la périphérie et une paroi inclinée annulaire centrée sur l'axe sur l'une de ses faces, et une pluralité d'inducteurs photoélectriques espacés de la périphérie de la roue d'engrenage transparente et montés en parallèle. L'axe fait tourner la roue d'engrenage, la lumière de la source est projetée sur la paroi inclinée de la roue d'engrenage et est réfléchie radialement, via les dents ou les espaces entre les dents de la roue d'engrenage transparente, sur les inducteurs photoélectriques, lesquels peuvent être déclenchés ou non alors. Le circuit d'amplification connecté à la sortie des inducteurs photoélectriques est attaqué et produit un signal numérique correspondant au sens et à l'angle de rotation de l'axe tournant.

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