Apparatus for identifying production codes on articles
First Claim
1. An apparatus for identifying a production code appearing on an article, which comprises light beam detection means responsive to light from a source of illumination and which has been reflected or refracted from a production code on an article, scanning means to enable the light beam detection means to scan the article whereby an output signal characteristic of the code is provided, means for creating at least one window in time within each scan period, detection means responsive to the window creation means and to the light beam detection means to provide a signal characteristic of any code marks detected during only the window in time, and means responsive to the detection means for decoding the signals therefrom to provide an indication of the code on the article.
1 Assignment
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Accused Products
Abstract
The apparatus is particularly suited for identifying mould cavity numbers formed in binary code in the stippling on the base of glass containers. It comprises light beam detection means (2), such as a photodiode array, which scans an area of the article to provide an output characteristic of the code; means (12) are provided for creating at least one window in time within each scan period by selecting which diodes in the array commence and terminate the window. Only output signals from the light beam detection means within the window in time are decoded to provide the code on the article. Preferably, the window is selected manually, e.g. by thumbwheel stores (14), and, further, a true decoding is arranged to arise for "1" in the binary code (presence of a stippling mark) only if a predetermined number of photodiodes within the window are activated at any one time. This true decoding reduces errors due to refraction of light from defects in the glass. The predetermined number of photodiodes may also be selected manually e.g. by thumbwheel stores (22).
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Citations
9 Claims
- 1. An apparatus for identifying a production code appearing on an article, which comprises light beam detection means responsive to light from a source of illumination and which has been reflected or refracted from a production code on an article, scanning means to enable the light beam detection means to scan the article whereby an output signal characteristic of the code is provided, means for creating at least one window in time within each scan period, detection means responsive to the window creation means and to the light beam detection means to provide a signal characteristic of any code marks detected during only the window in time, and means responsive to the detection means for decoding the signals therefrom to provide an indication of the code on the article.
Specification