Optical scanning system and method including a collection system

Details Optical scanning system and method including a collection system Optical scanning system and method including a collection system

1998-07-31

2000-05-02

Lee, Michael G

Registers

Coded record sensors

Particular sensor structure

23546232, 23546235, 235454, G06K 710

Patent

active

06056198&

ABSTRACT:
A data reading system and method which renders the return signal strength of light reaching the detector more uniform over greater distances and/or positions relative to the collection system and including an optical correction module or corrective optical element(s) is placed in the light collection path to the detector whereby the characteristics of light coming from sources in different locations and/or distances relative to the collection lens may be changed. In one embodiment, an optical element such as a diffusion element or aperture is placed between a collection lens and the detector such that the amount of collected light from a far field target reaching the detector is maximized and the amount of collected light from a near field target reaching the detector is selectively inhibited rendering the total light intensity on the detector more uniform as between the far field signal and the near field signal.

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