Optical reader for scanning optical indicia by way of varying ob

Details Optical reader for scanning optical indicia by way of varying ob Optical reader for scanning optical indicia by way of varying ob

1997-10-07

1999-09-07

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

23547201, H01J 314

Patent

active

059490683

ABSTRACT:
An optical reader for reading optical indicia includes an imaging element for forming an image of the optical indicia; a photodetector element having an aperture with a width smaller than the width of a smallest element in the image to be discerned by the optical reader; and optical means for causing the image to be swept past the aperture to produce an output of the photodetector indicative of the optical indicia. The optical reader also may include an optical element which varies an image distance between the imaging element and the photodetector with respect to time to correspondingly vary an object distance at which the optical indicia is located from the imaging element in order that the image is focused at the image plane.

REFERENCES:
patent: 3453419 (1969-07-01), Torrey
patent: 3636317 (1972-01-01), Torrey
patent: 3812325 (1974-05-01), Schmidt
patent: 3860794 (1975-01-01), Knockeart et al.
patent: 3931524 (1976-01-01), Herrin
patent: 4093865 (1978-06-01), Nicki
patent: 4282425 (1981-08-01), Chadima, Jr. et al.
patent: 4387297 (1983-06-01), Swartz et al.
patent: 5130520 (1992-07-01), Shepard et al.
patent: 5484990 (1996-01-01), Lindacher et al.
patent: 5815300 (1998-09-01), Ohkawa et al.

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