Optical printer head and method of lighting up optical...

B - Operations – Transporting – 41 – J

Patent

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B41J 2/45 (2006.01) G06K 15/12 (2006.01)

Patent

CA 2374034

An optical printer head having a structure of increasing an exposure, and forming pixels by exposing a photosensitive drum to light, comprising a light emitting device array having at least two light emitting spot rows, and a rod lens array for forming light spot rows by projecting light beam from the light emitting device array onto the photosensitive drum, wherein the at least two light emitting spot rows have the same pitch in the main scanning direction parallel to the rotation direction of the drum, and light emitting spots in each light emitting spot row are arranged to align in the sub-scanning direction perpendicular to the rotation direction of the drum.

L'invention concerne une tête d'impression optique qui, de par sa structure, augmente l'exposition, qui, pour former les pixels, expose un tambour photosensible à la lumière, et qui comprend d'une part, un réseau de dispositifs électroluminescents agencé en deux rangées de points électroluminescents au moins, et d'autre part un réseau de lentilles barreaux qui, pour former des rangées de points lumineux, projette le faisceau lumineux émis par le réseau de dispositifs électroluminescents sur le tambour photosensible. La tête d'impression optique selon l'invention est caractérisée en ce que les deux rangées au moins de points électroluminescents ont le même pas dans le sens de balayage principal, parallèlement au sens de rotation du tambour, et en ce que les points électroluminescents de chacune des rangées sont agencés de manière à être alignés dans le sens de sous-balayage, perpendiculaire au sens de rotation du tambour.

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