Method and apparatus for non-contact reading of a relief pattern

Details Method and apparatus for non-contact reading of a relief pattern Method and apparatus for non-contact reading of a relief pattern

1993-07-21

1995-02-28

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

235462, 235494, 235467, 235440, G06K 710

Patent

active

053939670

ABSTRACT:
There is disclosed a non-contact apparatus and method for reading a surface that has information encoded in a relief pattern thereon. The apparatus comprises an optical transmitter for projecting a line of light onto the relief pattern at a first angle to a normal of the surface; an optical receiver that views the projected line of light at a second angle to the normal of the surface and produces a signal that is representative of an image of the reflection thereon. The image viewed by the receiver has parallactic displacements of the line of illumination that occur transitions between raised and recessed portions of the relief pattern. The displacements are detected by a pattern detector which is coupled to the optical receiver and submitted to a decoder. The optical receiver can be realized as a plurality of light sensors arranged in a linear, or a two dimensional array, together with suitable focusing optics. The optical transmitter can produce either a fan beam of light or sweep a spot of light across the surface.

REFERENCES:
patent: 4282425 (1981-08-01), Chadima, Jr. et al.
patent: 5059776 (1991-10-01), Antes
patent: 5258605 (1993-11-01), Metlitsky et al.

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