Hand-held instant bar code reader having automatic focus control

Details Hand-held instant bar code reader having automatic focus control Hand-held instant bar code reader having automatic focus control

1992-09-16

1994-05-03

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235455, 235467, G06K 710

Patent

active

053089669

ABSTRACT:
A hand-held bar code reader includes one or more photosensor arrays which provide a plurality of image sensor portions arranged for receiving images of a bar code through a plurality of selectively usable paths of different focal lengths which are defined by a passive optical system. A distance measuring system controls the sensor portion which is used to control the focal length. In one embodiment, the bar code image is projected to a plurality of receiving mirror surfaces, thence to a plurality of additional mirror surfaces and thence through lens barrels to mirrors which project the images to photosensor arrays. In another, the bar code image is projected to a plurality of receiving mirror surfaces, thence to an additional mirror surface, and thence through a single lens barrel to a mirror which projects the images to a photosensor array.

REFERENCES:
patent: 4136821 (1979-01-01), Sugiura
patent: 4282425 (1981-08-01), Chadima
patent: 4422745 (1983-12-01), Hopson
patent: 4500776 (1985-02-01), Laser

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