Illumination sources and subjects having distinctly matched and mismatched narrow spectral bands
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G03C-001/00
C04B-014/00
출원번호
US-0099498
(2011-05-03)
등록번호
US-8551683
(2013-10-08)
발명자
/ 주소
Gardner, Norman A.
Bell, Edward H.
Stovold, Terry
출원인 / 주소
LaserLock Technologies, Inc.
대리인 / 주소
Morrison & Foerster LLP
인용정보
피인용 횟수 :
2인용 특허 :
6
초록▼
A light source is configured to emit narrow peaks at discrete spectral bands, especially primary color wavelengths, added to simulate the effect of a broadband light source. A subject is provided with a pigment, examples being certain rare earth lanthanides, with a strong absorption peak at a corres
A light source is configured to emit narrow peaks at discrete spectral bands, especially primary color wavelengths, added to simulate the effect of a broadband light source. A subject is provided with a pigment, examples being certain rare earth lanthanides, with a strong absorption peak at a corresponding narrow spectral band. The pigment has a nominal hue under true broadband light. When illuminated by the narrow band source, the absorption peak eliminates the contribution of one of the primary colors, producing a distinct shift in hue of the pigmented subject. The change in hue cannot be anticipated from the appearance of illuminated subjects that lack the pigment, which remain normal. The narrow absorption peak is not noticeable under unmatched light sources or true broadband light sources, e.g., sunlight. The hue shift effect is useful for security authentication, informational and decorative applications.
대표청구항▼
1. In combination, a light source and a subject, wherein the light source has an a illumination spectrum characterized by a distinctively stronger narrow band emission peak that has a full-width at half maximum of 10 to 30 nm at a predetermined wavelength within a spectrum compared to other waveleng
1. In combination, a light source and a subject, wherein the light source has an a illumination spectrum characterized by a distinctively stronger narrow band emission peak that has a full-width at half maximum of 10 to 30 nm at a predetermined wavelength within a spectrum compared to other wavelengths; and, the subject has a pigment applied thereto, wherein the pigment has a reflection spectrum characterized by one of a distinctively stronger reflection peak at the predetermined wavelength compared to said other wavelengths and a distinctively weaker reflection gap at the predetermined wavelength compared to said other wavelengths; wherein the pigment gives the subject a distinct appearance when illuminated by the light source, due to a color shift from the emission peak matching one of the reflection peak and the reflection gap, as compared to a nominal appearance when illuminated by an alternate light source which does not include the distinctively stronger emission peak at the predetermined wavelength as compared to said other wavelengths. 2. The combination of claim 1, wherein the pigment is applied to the subject as a surface coating. 3. The combination of claim 1, wherein the pigment is applied to the subject by incorporating the pigment into the subject. 4. The combination of claim 1, wherein the pigment is applied to the subject as an identifying indicia. 5. In combination, a light source and a subject, wherein, the light source has an illumination spectrum characterized by a plurality of narrow peaks within a spectrum; the subject has a pigment applied thereto, wherein the pigment has a reflection spectrum characterized by one or more reflection gaps; the pigment gives the subject a distinct appearance when illuminated by the light source due to a color shift from at least one of the narrow peaks matching one or more of the reflection gaps, as compared to a nominal appearance when illuminated by a broadband light source. 6. The combination of claim 5, wherein the pigment is applied to the subject as a surface coating. 7. The combination of claim 5, wherein the pigment is applied to the subject by incorporating the pigment into the subject. 8. The combination of claim 5, wherein the pigment is applied to the subject as an identifying indicia. 9. The combination of claim 5, wherein the pigment is further characterized by a plurality of reflection peaks interspersed between two or more of the reflection gaps. 10. The combination of claim 5, wherein the pigment is further characterized by two reflection peaks, one each on either side of and adjacent to the reflection gap that matches one of the narrow peaks. 11. A method for producing a detectable change in appearance, comprising the steps of: applying a pigment to a subject, the pigment having at least one reflection gap within a reflective spectrum; illuminating the subject with a first broadband light source having an illumination spectrum encompassing the reflective spectrum of the pigment, whereupon the subject has an appearance that is nominal; subsequently illuminating the subject with a second light source characterized by a visible illumination spectrum with discrete illumination bands, wherein at least one of the illumination bands overlaps the reflection gap of the pigment, thereby visibly changing the appearance of the subject to be different than nominal. 12. The method of claim 11, wherein applying the pigment to the subject includes applying the pigment as a surface coating. 13. The method of claim 11, wherein applying the pigment to the subject includes incorporating the pigment into the subject. 14. The method of claim 11, wherein applying the pigment to the subject includes applying the pigment as an identifying indicia.
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