ovmi optical gradient magnetic ink printed matter online detection system and method

A magnetic ink and detection system technology, which is applied in the direction of optical testing for flaws/defects, etc., to improve product quality and safety, improve quality control, and realize the effect of downloading and uploading

Active Publication Date: 2018-03-06
XIAN BANKNOTE PRINTING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the problems existing in the existing online detection of OVMI printed matter, the present invention provides an online detection system and method for OVMI optical gradient magnetic ink printed matter

Method used

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  • ovmi optical gradient magnetic ink printed matter online detection system and method
  • ovmi optical gradient magnetic ink printed matter online detection system and method
  • ovmi optical gradient magnetic ink printed matter online detection system and method

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Embodiment

[0058] The layout of each detection module of OVMI pattern detection is as follows: figure 2 As shown: the detection system is to install OVMI single light source special detection module 5 and dual light source detection module 6 on the detection cylinder of the printing machine respectively, and install the perspective detection module 7 on the paper delivery chain. According to the anti-counterfeiting characteristics of the OVMI scroll bar, simulate the artificial quality evaluation method, use a single light source at the detection point, select a strip-shaped white LED light source, and its installation direction is parallel to the OVMI pattern scroll bar and parallel to the axis of the detection roller. At the same time, the single light source The angle between 1 and the normal line of the detection cylinder 3 is 0°-40°, the angle between the first CCD camera 2 and the normal line of the detection cylinder 3 of the printing press is 0°-30°, such as image 3 shown.

[...

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Abstract

The invention relates to an OVMI optical gradient magnetic ink printed matter online detection system and method, including an OVMI single light source special detection module, a double light source detection module and a perspective detection module. The OVMI printed matter online detection system and method of the present invention pass a single light source and a CCD camera at a certain angle The characteristics of the lower imaging and the multi-point complementary detection method realize the online quality inspection of the OVMI pattern, which effectively improves the quality control of the anti-counterfeiting pattern printing process and improves the product quality and safety.

Description

technical field [0001] The invention relates to an online detection system and method for OVMI optical gradient magnetic ink printed matter (hereinafter referred to as OVMI pattern). Background technique [0002] Existing OVMI pattern detection methods are mostly used on small sheet sorting machines, mainly through infrared light source detection. The routine detection of OVMI patterns is mainly to detect printing defects such as OVMI pattern misalignment, ink staining, and ink smudges under the dual light source module, and at the same time detect shallow printing defects such as lack of printing and light flowering under the B color channel of the dual light source module; Under the detection module, detect OVMI pattern lack of printing and shallow flower printing defects. The main defect is that the optical scrolling effect detection of OVMI prints is not ideal, and it cannot effectively detect the width, brightness and position changes of the optical scrolling bar; the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88
Inventor 赵克强张超赵小兰王皓王曦
Owner XIAN BANKNOTE PRINTING
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