Lens with variable focal length

Details Lens with variable focal length Lens with variable focal length

1996-05-13

1999-01-26

Gross, Anita Pellman

Registers

Coded record sensors

Particular sensor structure

235455, G06K 710

Patent

active

058641289

ABSTRACT:
A system and method for scanning a bar code target by continuously varying the focal range of a bar code scanning system. A light source is provided for generating light rays, and a lens is provided for focusing the light rays. The lens has a variable focal length. The focused light rays are scanned across the bar code target with a beam scanner. While the focused light rays are being scanned, the focal length of the lens is continuously varied.

REFERENCES:
patent: 4783155 (1988-11-01), Imataki et al.
patent: 4818886 (1989-04-01), Drucker
patent: 5066301 (1991-11-01), Wiley
patent: 5365049 (1994-11-01), Peng
patent: 5386107 (1995-01-01), Dvorkis et al.
patent: 5438187 (1995-08-01), Reddersen et al.
patent: 5550367 (1996-08-01), Plesko
patent: 5641958 (1997-06-01), Rudeen

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