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Test method for optical performance of OVMI printed product

A technology of optical properties and testing methods, applied in the field of spectral detection, to achieve the effect of filling the detection gap

Active Publication Date: 2016-05-25
NANCHANG BANKNOTE PRINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the optical performance of OVMI prints is judged by human eyes. When human eyes observe OVMI prints, with different light sources (single or multiple, strong or weak) and different observation angles, t

Method used

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  • Test method for optical performance of OVMI printed product
  • Test method for optical performance of OVMI printed product
  • Test method for optical performance of OVMI printed product

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[0026] 1. Test principle

[0027] 1) Description of the measurement process

[0028] When the incident light angle and observation angle are fixed, a fixed bright stripe can be seen on the OVMI print. figure 2 Taking the incident angle of 0° and the observation angle of 40° as an example, the scanning measurement of the OVMI ink by the detection instrument under the fixed incident angle and observation angle is described.

[0029] Depend on figure 2 , image 3 It can be seen that when the incident angle is given and the observation angle is unchanged, the information of the fringes on the OVMI print remains unchanged. figure 1 In the measurement process shown, through the translation of the sample stage, the detection instrument realizes the measurement of each point on the OVMI ink one by one. When the platform moves, the position of the measurement spot (point light source) on the OVMI ink changes, but the angle or position of the observation end relative to the spot d...

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Abstract

The invention discloses a test method for optical performance of an OVMI printed product. The width of a bright fringe, the position, the bright and dark contrast and the integral brightness of the bright fringe at a set observation angle are obtained; and the rolling distance and color change of the bright fringe at two different observation angles are arbitrarily selected. The method comprises the following steps: performing initial zero calibration on various instruments, wherein a sample table is perpendicular to incident light; adjusting the height of the sample table and adjusting the zero position of an inner arm; performing mode selection; and starting sample measurement including dark background measurement, light source measurement, sample distance measurement and sample measurement, and analyzing and storing data. The test method has the advantages and effects that the technology can quantitatively describe the width, brightness and sharpness of the bright fringe observed by human eyes, especially the rolling anti-counterfeiting effect of the bright fringe of the OVMI printed product, so that the optical anti-counterfeiting effect of the OVMI printed product can be quantitatively assessed; and OVMI novelty printing can be realized and the detection blank in the test of the optical performance of the OVMI printed product is filled up.

Description

technical field [0001] The invention relates to a spectral detection of banknote printed matter, in particular to a method for testing the optical properties of OVMI printed matter. Background technique [0002] OVMI magnetic optically variable ink has been widely used in securities. Its optical anti-counterfeiting performance mainly depends on the magnetic optically variable pigment in the ink. In actual printing, this magnetic optically variable pigment is often formulated into UV ink. After the pigment in the printing ink film is magnetized by a specific magnetization device and cured by UV, the printed image changes with the viewing angle. Not only can the color change, but also appear like strips and concentric circles due to different magnetization devices. , Radial and other three-dimensional scrolling effect. On the issued Zodiac commemorative banknotes, the "10" denomination number on the front is printed with OVMI magnetic light-changing ink. As the viewing angle ...

Claims

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Application Information

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IPC IPC(8): G06T7/00
CPCG06T7/0004G06T2207/10004G06T2207/10024G06T2207/30144
Inventor 王勤刘义龙周树荣彭勇剑高瑞丁山殷海玮
Owner NANCHANG BANKNOTE PRINTING
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