Portable optical reader with motion sensing system and method

Details Portable optical reader with motion sensing system and method Portable optical reader with motion sensing system and method

1994-09-23

1996-07-09

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

235462, G06K 710

Patent

active

055346847

ABSTRACT:
A portable terminal unit of tablet configuration contains an optical reader for scanning two-dimensional information on a target area. The terminal unit has an optical window near an underside thereof and contains an optical reader having a given depth of field and field of view at a given range from the window. The apparatus includes a ranger for operably determining the range of the target area from the terminal unit and a controller for operably controling activation of the reader. The controller may be configured to permit activation of the reader as: the target area is spaced within a certain tolerance range about an optimal focal length from the reader; the target area is spaced within the depth of field of the reader and motion of the terminal unit relative to the target area is halted; or the target area is spaced within the depth of field of the reader and motion of the terminal unit relative to the target area is reversed.

REFERENCES:
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patent: 4877949 (1989-10-01), Danielson et al.
patent: 5010241 (1991-04-01), Butterworth
patent: 5019699 (1991-05-01), Koenck
patent: 5151580 (1992-09-01), Metlitsky et al.
patent: 5278399 (1994-01-01), Sano
patent: 5308966 (1994-05-01), Danielson et al.
patent: 5426288 (1995-06-01), Obata

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