Phosphor-Coated LED Signal Light for Temperature Stability

The patent combines two different LED types (first LEDs and second LEDs) with different wavelength characteristics to create a composite light source system. The first LEDs emit a first dominant wavelength while the second LEDs emit a second dominant wavelength that is converted to a third dominant wavelength through phosphor coating and filtering, then mixed to achieve the desired fourth dominant wavelength. This composite approach allows the system to maintain stable light output across extreme temperatures by leveraging the complementary thermal characteristics of different LED materials.

The patent changes the operational parameters of the LED system by using multiple LEDs with different dominant wavelengths and converting/filtering their outputs. Instead of relying on a single LED type, the system dynamically combines light from different sources (first LEDs emitting first dominant wavelength, second LEDs emitting second dominant wavelength converted to third dominant wavelength) to achieve a stable fourth dominant wavelength output that resists temperature-induced degradation.

The patent merges multiple LED types and optical components into an integrated signal light assembly. The housing contains both first LEDs and second LEDs along with the necessary phosphor coatings, filters, and mixing optics, combining these elements into a single functional unit that delivers improved temperature resistance and light stability without requiring separate systems.

The signal light device performs multiple functions within a single structure: the first LEDs provide primary light emission, the second LEDs with phosphor conversion provide wavelength transformation, the filters provide spectral purification, and the mixing optics combine the outputs. This multi-functional integration achieves reliable temperature-resistant operation while maintaining a unified device architecture.