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Multichannel optically variable device

A technology of image elements and security elements, applied in optics, optical elements, decorative arts, etc., can solve problems such as unreliable printing

Inactive Publication Date: 2015-04-15
CCL SECURE PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty is that using conventional gravure printing, lines significantly smaller than 35-45 microns cannot be reliably printed

Method used

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  • Multichannel optically variable device
  • Multichannel optically variable device
  • Multichannel optically variable device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0079] First refer to Figure 1A , Figure 1B , Figure 1C , Figure 1D , Figure 1E , Figure 1F , Figure 1G , Figure 1H and Figure 1J , shows a plan view of the security element 10 with sub-regions 10A, 10B, 10C and 10D. Sub-region 10A produces an image 20A at a first viewing angle. Sub-region 10A undergoes a change in appearance at the second viewing angle, and the switching contrast shows a negative image 20A'. In image 20A', the light areas are darkened, and the dark areas (letters 'A' and 'U') are lightened.

[0080] Likewise, subregion 10B produces an image 20B at a first viewing angle and a negative image 20B' at a second viewing angle, subregion 10C produces positive and negative images 20C, 20C', and subregion 10D produces positive and negative images 20D, 20D'.

[0081] In a conventional raster image, the contrast transition from positive to negative occurs at the same angle for each sub-region 10A-10D. Figure 1A , Figure 1B , Figure 1C , Figure ...

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PUM

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Abstract

A security element, a security device including a security element and a method of manufacturing a security device. The element having focusing elements and image elements, the image elements are located in an object plane such that each image element is associated with one of the focusing elements, wherein the object plane includes at least first and second distinct subregions, and an image element within the first subregion is phase-displaced by a phase-displacement distance with respect to an image element within the second subregion, and wherein the first and second subregions produce first and second optically variable images or part-images.

Description

technical field [0001] The present invention relates to optically variable devices for security and decorative applications and methods for their manufacture. Background technique [0002] It is known to provide optically variable devices in which an array of gratings (partial cylindrical lenses) is focused on an object plane containing sets of interleaved image elements. Each set of image elements (strips) belongs to a different image, so as the person viewing the device changes perspective, different images are seen. Devices comprising non-cylindrical lenses, such as those comprising two-dimensional arrays of spherical microlenses, are also known. [0003] In security applications, especially when handling flexible security documents such as banknotes, it is desirable to minimize the thickness of the lens array applied to the security document. Known light barrier arrangements, as described above, are relatively thick (hundreds of micrometers) and are not suitable for us...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/00B42D25/30G07D7/00B41M3/14G07D7/12
CPCG02B3/0037B44F1/10B42D2035/26B42D2035/50B42D2033/24G02B27/10B42D2035/16B42D25/324B42D25/425B42D25/29B42D25/328G07D7/003
Inventor 卡洛·伊万·约利克
Owner CCL SECURE PTY LTD