Method and apparatus for determining the position of the focus o

Details Method and apparatus for determining the position of the focus o Method and apparatus for determining the position of the focus o

1998-06-22

2000-09-19

Frech, Karl D.

Registers

Coded record sensors

Particular sensor structure

23546223, G02B 2608, G06K 710

Patent

active

061199427

ABSTRACT:
A method is described for the determination of the position of the focus of an opto-electronic apparatus, in particular of a bar code reader, which transmits a light beam through a focusing lens. In the method the width of the transmitted light beam is determined at a specific reference position and the position of the focus is determined from the width that is found. Furthermore the invention is directed to an opto-electronic apparatus, in particular to a bar code reader for carrying out the method.

REFERENCES:
patent: 4818886 (1989-04-01), Drucker
patent: 4920255 (1990-04-01), Gabeler
patent: 4990771 (1991-02-01), Minoura et al.
patent: 5347121 (1994-09-01), Rudeen
patent: 5386107 (1995-01-01), Dvorkis et al.
patent: 5418638 (1995-05-01), Hirasawa
patent: 5565668 (1996-10-01), Reddersen et al.
patent: 5717194 (1998-02-01), Forbes et al.

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