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ROTATING HELICAL APERTURE SCANNER [1 record]

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Record 1 2000-07-25

English

Subject field(s)
  • Computer Hardware
  • Office Automation
  • Internet and Telematics
OBS

The helical aperture facsimile transmitter is fairly common on low-to mid-volume fax units. The original is roller fed over a flatbed copy platen and illuminated by an area lamp. Lens and mirror optics reflect and focus one scan line of the moving document at a time, first through a fixed horizontal slit aperture, and then through a rotating helical aperture. The rotating of the helical aperture produces one lateral scan of the original per revolution, with the passing light being focused a final time onto a photocell for conversion to an electrical signal.

French

Domaine(s)
  • Matériel informatique
  • Bureautique
  • Internet et télématique

Spanish

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