Electrooptical scanning device

Details Electrooptical scanning device Electrooptical scanning device

1977-06-16

1978-12-26

Tokar, M.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356429, 356400, G06K 710

Patent

active

041318048

ABSTRACT:
An electrooptical scanning device which can detect the relative position of register mark applied to a moving web, either serially on a single track or in two parallel, side-by-side tracks which extend in the direction of movement of the web. Light from a light source positioned some distance above the web is split into three light beams and the light beams are reflected downwardly towards the web. Lenses are positioned to receive and direct the light beam at an oblique angle onto the marks on the track or tracks. The lenses are aligned with the tracks and the light beam passing through a given lens is directed to the opposite track to illuminate three positions, two on the first track and one position on the second track. Light impinging on the web at these positions is scattered. Vertically upwardly scattered light is captured by the lens overlying the particular illuminated position and hence directed via suitable optics to photo-detectors which generate output signals that can be used to determine the relative locations of the marks to thereby detect any misalignments of the web.

REFERENCES:
patent: 3453439 (1969-07-01), Donald et al.
patent: 3867038 (1975-02-01), Westell

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