Method and apparatus for maintaining a scanning optical path len

Details Method and apparatus for maintaining a scanning optical path len Method and apparatus for maintaining a scanning optical path len

1995-06-06

1997-04-01

Pitts, Harold

Registers

Coded record sensors

Particular sensor structure

235470, G06K 710

Patent

active

056169094

ABSTRACT:
A method and apparatus for maintaining a constant optical path length when scanning objects at different distances. The apparatus has a reading device that reads data carrying symbology on an object being scanned, and an optical system having a plurality of optical paths between the object being scanned and the reading device, where each of the plurality of optical paths has a different path length. The apparatus also has a size detector that determines a dimension of the size of the object being scanned and outputs a signal based on the dimension, and a selecting device that selects one of the plurality of optical paths of the optical system based on the signal output by the size detector to maintain an optical path length between the object being scanned and the reading device within a predetermined range.

REFERENCES:
patent: 4808804 (1989-02-01), Krichever et al.
patent: 5166820 (1992-11-01), Fujita
patent: 5198648 (1993-03-01), Hibbard
patent: 5258605 (1993-11-01), Metlitsky et al.
patent: 5308966 (1994-05-01), Danielson et al.
patent: 5485263 (1996-01-01), Bjorner et al.

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