Title:
セキュリティ装置およびその製造方法
Document Type and Number:
Japanese Patent JP6991244
Kind Code:
B2
Abstract:
A security device is disclosed, comprising: a first ink (21) and a second ink (22) each arranged in respective laterally offset first and second regions of the security device, the first and second inks each comprising a respective luminescent material which both luminesce in response to irradiation at at least one excitation wavelength in the ultra-violet spectrum, the first and second inks each exhibiting substantially the same non-luminescent visible colour as one another when illuminated with visible light in the absence of the at least one excitation wavelength, and the first and second inks each exhibiting visible colours which are different from the non-luminescent visible colour and from one another when illuminated with a combination of visible light and the at least one excitation wavelength; a third ink (23) arranged in a third region of the device laterally offset from the first and second regions of the device, the third ink not luminescing in response to the at least one excitation wavelength, and the third ink exhibiting substantially the same non-luminescent visible colour as the first and second inks when illuminated with visible light in the absence of the at least one excitation wavelength; and a fourth ink (24) arranged in a masking pattern which partially overlaps one or more portions of the first ink in the first region and/or of the second ink in the second region, the fourth ink not luminescing in response to the at least one excitation wavelength, and the fourth ink exhibiting a different visible colour from the non-luminescent visible colour of the first, second and third inks when illuminated with visible light in the absence of the at least one excitation wavelength. When the security device is illuminated with visible light in the absence of the at least one excitation wavelength, the first, second and third regions together appear as one continuous pattern in the non-luminescent visible colour, the fourth ink obscuring the presence of more than one ink forming the continuous pattern, and when the security device is illuminated with a combination of visible light and the at least one excitation wavelength, the first and second regions become visibly distinct from each other and from the remainder of the continuous pattern.
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Inventors:
Mandy, Daryl
Application Number:
JP2019561249A
Publication Date:
January 12, 2022
Filing Date:
May 09, 2018
Export Citation:
Assignee:
De La Lou International Limited
International Classes:
B41M3/14; B42D25/23; B42D25/24; B42D25/29; B42D25/355; B42D25/387; G07D7/128
Domestic Patent References:
| JP2004181791A | ||||
| JP2010518473A | ||||
| JP2014120929A | ||||
| JP2014051073A | ||||
| JP2001205917A |
Foreign References:
| WO2004050376A1 | ||||
| EP2075767A1 |
Attorney, Agent or Firm:
Asamura patent office
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