Scanning of moving objects using unique polygon mounted on carou

Details Scanning of moving objects using unique polygon mounted on carou Scanning of moving objects using unique polygon mounted on carou

1991-02-25

1993-02-02

Hannaher, Constantine

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

250236, 359196, 359218, G02B 2610

Patent

active

051842467

ABSTRACT:
A polygon for reading and writing information, and for tracking industrial products on a rotating carousel is arranged so that each of its sides behaves effectively like a mirror mounted directly on a rotational axis of the polygon. When this polygon is installed in the center of rotating carousel, it can perform accurate tracking of objects on the carousel with a constant (fixed) rotational speed equal to half of the rotational speed of the carousel. One design employs a polygon with side mirrors tilted in an arbitrary angle with surrounding mirrors (opposite-side mirrors) tilted at a right angle with respect to the tilted side mirrors of the polygon (FIG. 12). Additional designs are of polygons with side mirrors tilted at an arbitrary angle .alpha. and opposite-side mirrors tilted at an angle .alpha.
(where n is an integer) with respect to the tilted side mirrors of the polygon. Such a polygon is illustrated in FIG. 11 for n=1 (.alpha.=.beta.=45 degrees). All the planes of the side mirrors and the surrounding mirrors (opposite-side mirrors) have a common intersection located on the polygon's axis as shown (FIGS. 5, 6, and 11). The design of these polygons eliminates all the unwanted effects of off-axis side mirrors which exist in standard polygons. This is done by producing an optical path that is equivalent to the optical path of scanning mirrors so that their plane contains the rotational axis of the system (mounted directly on the rotational axis-FIG. 2).

REFERENCES:
patent: 4084092 (1978-04-01), Runciman
patent: 4509819 (1985-04-01), Sherman et al.
patent: 4624528 (1986-11-01), Brueggemann
patent: 4733072 (1988-03-01), Lettington
patent: 4766308 (1988-08-01), Karlsson
patent: 5044710 (1991-09-01), Iwai et al.

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