Dual format dual resolution scanner with off-axis beams

Details Dual format dual resolution scanner with off-axis beams Dual format dual resolution scanner with off-axis beams

1997-02-26

1999-01-19

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359201, 359216, 359217, 347261, G02B 2608

Patent

active

058619771

ABSTRACT:
A laser scanner (10) has a light source (12), which produces a light beam (32) which is incident on a polygon tower (14) comprised of a first polygon (30) having a first diameter and first number of facets, and a second polygon (20) having a second diameter and second number of facets. The polygon tower (14) rotates about an axis common to both the first (30) and second (20) polygon and the first polygon. The point at which the light beam is incident on the polygon tower is shifted in a direction approximately parallel to the axis of the polygon tower so that the incident light is directed at either the first polygon or the second polygon. In one embodiment a reflected light beam from one of the polygons is off center from an optical axis of a scan lens (16). Moving the point at which the light beam is incident on the polygon tower (14) from the first polygon (30) to the second polygon (20), changes the format size, and resolution without moving or refocusing the scan lens, and without moving the polygon tower (14) or the imaging medium.

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