Back to results
US 12,135,278 B2Granted
Light emitting diode arrangements for gemstone evaluation
AssigneeGemological Institute of America, Inc. (GIA)
InventorsJing Zeng, Hiroshi Takahashi, Jon Neal
Life of this patent
Estimating the term…
Abstract
Some examples herein include systems and methods of creating standards of gemstones of various classifications, which may display certain characteristics of the various classifications when excited by ultraviolet radiation and fluoresce in response. In some examples, a set of standards are created using fluorescent material, filters, and a radiation source to compare against a sample gemstone. In some examples, specific Light Emitting Diodes are selected to illuminate the gemstone samples under analysis.
Claims13
A system comprising:
- a main body including a stage and a radiation source;
- wherein the radiation source is configured between 7 and 9 inches above the stage to emit radiation onto the stage, and the radiation source includes an array of Light Emitting Diode (LEDs) sets, the array including at least four LED sets,
- wherein the at least four LED sets are spaced one half inch apart, and
- each LED set including four LEDs with one Red, one Ultraviolet (UV), one White with a correlated color temperature of about 5500K as a base spectrum, and one White with a correlated color temperature of about 6500K as a base spectrum;
- wherein the main body includes a holographic diffuser with diffusing angles ranging from 0.5 degrees to 50 degrees.
2 more elements
A system comprising:
- a flat stage for gemstone samples;
- a radiation source configured between 8 and 10 inches above the flat stage;
- wherein the radiation source includes a linear arrangement of groups of Light Emitting Diodes, (LEDs), each group including one Ultraviolet (UV) light wavelength range, and one Red light wavelength range, one White light with a correlated color temperature of about 5500K as a base spectrum, and one White light with a correlated color temperature of about 6500K as a base spectrum;
- wherein the group of LEDs is a two row by two column arrangement,
- wherein the one White light with the correlated color temperature of about 5500K is in a first of the two columns and the one White light with the correlated color temperature of about 6500K is in a second column of the two columns.
2 more elements
Dependencies are inferred from the claim text.