Optical scanner having enhanced depth of illumination

Details Optical scanner having enhanced depth of illumination Optical scanner having enhanced depth of illumination

1994-10-31

1996-06-04

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

2502081, 355 25, 362 16, H01J 314

Patent

active

055235620

ABSTRACT:
An optical scanner having enhanced depth of illumination may comprise an elongate light source positioned along a longitudinal axis for illuminating points contained within a scan plane bounded at an upper edge by a far limit focal plane and at a lower edge by a near limit focal plane. A first light shade and a second light shade are positioned in spaced apart relation to one another and to the elongate light source. The first and second light shades define a lamp aperture that subtends a first angle with respect to a first line defined by the intersection of the scan plane with the near limit focal plane and that subtends a second angle with respect to a second line defined by the intersection of the scan plane with the far limit focal plane.

REFERENCES:
patent: 4709144 (1987-11-01), Vincent
patent: 4870268 (1989-09-01), Vincent et al.
patent: 4926041 (1990-05-01), Boyd
patent: 4980720 (1990-12-01), Siegel
patent: 5038028 (1991-08-01), Boyd et al.
patent: 5227620 (1993-07-01), Elder et al.
patent: 5335158 (1994-08-01), Kaplan et al.

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