Registers – Coded record sensors – Particular sensor structure
Reexamination Certificate
1998-08-13
2001-11-20
Le, Thien M. (Department: 2876)
Registers
Coded record sensors
Particular sensor structure
C235S472010
Reexamination Certificate
active
06318634
ABSTRACT:
BACKGROUND
The field of the present invention relates to optical systems for data reading and particularly to a rotating scanning system and method.
Typically a data reading device such as a bar code scanner illuminates a bar code and senses light reflected from the code to detect the bars and spaces of the code symbols and thereby derive the encoded data. In a common system, an optical beam of light, such as a laser beam produced by a laser diode is scanned over a scan angle so as to scan the laser spot across the item being read. A variety of mechanical scanning mechanisms are known as described in for example U.S. Pat. Nos. 5,475,206, 5,475,207 and 5,629,510 or U.S. application Ser. No. 08/934,487, each of these disclosures hereby incorporated by reference, such scanning mechanisms comprising a rotating polygon mirror, dithering or oscillating mirror, scanning light source or laser diode, rotating/oscillating prisms, holographic elements and others devices. These scanning structures generally have fixed mechanical characteristics for generating a specific scan pattern which cannot be changed during operation and would typically require changing of the optical components of the scanning mechanism in order to vary the scan patterns.
SUMMARY OF THE INVENTION
The present invention is directed to a scan assembly or scan mechanism and method of scanning in which the mirror facet(s) of the scanning mirror, in addition to the rotating or pivoting action, are movable between at least two positions for providing multiple paths for each of the mirror facet(s). In a preferred configuration, the mirror facets of a rotating polygon are mounted and arranged such that the angular orientation of the mirror facets changes in response to change in the rotational speed of the polygon.
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U.S. application No. 08/934,487, Colley et al., filed Sep. 19, 1997, “Dithering Assemblies for Barcode Scanners”.*
French Search Report dated Jun. 5, 2000.
McQueen Alexander M.
Svetal Michael P.
Le Thien M.
Lyon & Lyon LLP
PSC Scanning Inc.
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