Importance

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Abstract

The scanner has a light transmitter (10) which radiates light onto a rotating mirror (12) for linewise scanning of an article (20). The mirror wheel (12) has mirror surfaces (1, 2, 3, 4, 5, 6) with different inclinations relative to its axis of rotation which project the light in parallel scanning lines onto the article (18). The light scattered back from the article (20) is picked-up by an optical system and transferred to a photodetector (30). The output signal of the photodetector (30) is stored after analogy-digital conversion in a memory (1', 2', 3', 4', 5', 6'). A pre-evaluation stage with a programmable module (32) accesses the memory (1', 2', 3-, 4', 5-, 6'), identifies the signal component originating frOm a bar code and transfers it to a second memory (38) which has a substantially smaller memory width but however a substantially larger memory depth. Here single components which are obtained in a plurality of scanning periods and which originate from bar codes are available for an analysis of the code information, which does not necessarily have to be effected synchronously with the scanning.

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First Claim