05534684 is referenced by 73 patents and cites 9 patents.

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.

Title
Portable optical reader with motion sensing system and method
Application Number
300178
Publication Number
5534684
Application Date
September 23, 1994
Publication Date
July 9, 1996
Inventor
Arvin D Danielson
Solon
IA, US
Agent
Simmons Perrine Albright & Ellwood
Assignee
Norand Corporation
IA, US
IPC
G06K 7/10
View Original Source