Flying spot optical scanner with a high speed dithering motion

Details Flying spot optical scanner with a high speed dithering motion Flying spot optical scanner with a high speed dithering motion

1995-07-28

1997-07-15

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235467, G06K 710

Patent

active

056486499

ABSTRACT:
An optical scanner includes a light source for producing a light beam for scanning a target wherein the light beam scans a target at a first low frequency and the beam also dithers in a direction orthogonal to the scanning direction at a second, high frequency. The dithering motion can be imparted by a oscillating mirror and allows improved reading of, for example, bar code symbols. In addition an optical scanner includes a laser light source producing a laser light beam into which a time-varying phase is introduced in order to reduce laser speckle noise.

REFERENCES:
patent: 4933538 (1990-06-01), Herman et al.
patent: 5115121 (1992-05-01), Bianco et al.
patent: 5168149 (1992-12-01), Dvorkis et al.
patent: 5235167 (1993-08-01), Dvorkis et al.
patent: 5545887 (1996-08-01), Smith et al.

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