Luminous patent families – Panerai brand watches
Radiomir, Luminor Panerai is an old brand, from 1860 on the establishment, and it is proud of three patents have left a luminous technology Radiomir.
Why is this technology called Panerai Radiomir, radioactive luminescent material reason is that using radium radium. Radium is a pure white alkaline earth metal, after exposure to air will be oxidized black. All compounds are radioactive radium, radium Radium is a radioactive Latin name meaning. Radium nature is not stable, probably in 1600 will become the radon decay, because the decay continues, it will itself emitted blue light.
Another important 1949 Panerai Luminor luminous technology has also applied for a patent for the use of the contents of another radioactive material tritium, as a light emitting material. This technique is safer, but there is still time constraints.
Radium and tritium Both materials are part of a self-luminous type luminous material, without absorbing energy from the outside, on sustainable light. Half-life of tritium is 12.5 years, meaning that the useful life of luminous tritium production is about ten years. After ten years, tritium start aging, yellowing, and gradually lose the luminous effect.
The current multi-use watch has a more long-lasting materials, such as the current mainstream Super-LumiNova, only irradiated for 30 minutes, it can last eight hours to issue a green light. This material appeared in the 1980s, its main ingredient is strontium aluminate salt, plus rare earths dysprosium after just a few minutes when exposed to light, can continue to light for several hours.