Security device using light reflection property
A safety device, a technology of light reflection, applied in optics, optical components, cards for carrying information, etc., can solve the problems of long time required for assembly, difficult deformation of colloidal crystals, and adhesion of colloidal crystals to the substrate. The effect of manufacturing cost
Pending Publication Date: 2021-05-14
KOREA MINTING SECURITY PRINTING & ID CARD OPERATING CORP
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Problems solved by technology
[0005] Meanwhile, attempts have been made to form thin colloidal crystals in the form of thin films, but it is difficult to adhere colloidal crystals to substrates, and various attempts have been made to form colloidal crystals on substrates, but self-assembly takes a long time, and did not form colloidal crystals uniformly
[0006] Compared with the self-assembly method, the induction assembly method has the advantage that it can shorten the time of colloidal crystallization, but there are problems that the process and manufacturing equipment are complicated and the types of colloidal particle materials are strictly limited.
[0007] In addition, colloidal crystals have limitations in their application to products such as bills and security documents that require flexibility because colloidal crystals are difficult to deform
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[0030] Hereinafter, the present disclosure will be described in more detail with reference to the accompanying drawings.
[0031] The drawings correspond only to the illustrated embodiments to show the technical scope of the present disclosure in more detail, and thus the scope of the present disclosure is not limited by the accompanying drawings. For the same reason, some elements are enlarged, omitted or simplified in the drawings.
[0032] figure 1 A vertical cross-section of a security device 10 according to an embodiment of the present disclosure is shown. The security device 10 includes a substrate 100 , a colloidal crystal 200 and an aging film 300 , and the colloidal crystal 200 is contained in a groove portion 110 formed in the substrate 100 . The aging film 300 enables the colloidal crystal 200 to self-assemble rapidly, stably, and uniformly, and the aging film 300 also serves to protect the colloidal crystal 200 . Therefore, the colloidal crystal 200 is preferabl...
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Abstract
The present invention relates to a security device comprising a colloidal crystal which exhibits excellent visibility and is also easily manufactured. The security device, according to the present invention, comprises: a substrate; a groove part formed on the substrate; a colloidal crystal positioned in the groove part; and an aging film. The security device, according to the present invention, exhibits excellent security and visibility, and thus may be used for securities, credit cards, security cards, anti-forgery products, etc.
Description
technical field [0001] The present disclosure relates to a security device in which colloidal crystals are formed in a groove portion of a substrate, and an aging film is provided on the substrate in which the colloidal crystals are formed, and particularly relates to a device due to its excellent visibility and safety A security product that is difficult to replicate. Background technique [0002] A colloid refers to particles uniformly dispersed in a specific solvent, while a colloidal crystal refers to monodisperse particles having a different refractive index from the matrix, which are regularly arranged by self-assembly etc. to form a lattice and exhibit unique properties according to the geometric characteristics of the unit particle substances with optical properties. [0003] The methods for manufacturing colloidal crystals include the gravity precipitation method using precipitation, the two-dimensional monolayer manufacturing method using evaporation to form a two...
Claims
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IPC IPC(8): B42D25/41B42D25/378G02B5/28
CPCB42D25/41B42D25/364B42D25/373B42D25/351B42D25/378G02B5/285
Inventor 崔原均金水东金洪建金贤洙金伊顿催惠俊
Owner KOREA MINTING SECURITY PRINTING & ID CARD OPERATING CORP