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US 11,685,306 B2Granted
Light emitting device
AssigneeLite-On Technology Corporation
InventorsWei-Te Cheng, Kai-Chieh Liang, Kuo-Ming Chiu, Fang-Jung Sun, Chun-Chieh Chang, Yi-Fei Lee
Life of this patent
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Abstract
A light emitting device including a lighting unit and a conversion material is disclosed. The conversion material is configured to convert a part of the invisible light emitted from the lighting unit into a visible light, which indicates that the lighting unit is in operation. The spectral energy of visible light is less than 20% of the spectral energy measured within a wavelength range of 200 nm to 380 nm.
Claims20
A light emitting device, comprising:
- a lighting unit configured to emit an invisible light;
- a conversion material configured to convert a small part of the invisible light into a visible light for indicating that the lighting unit is in operation,
- wherein, a wavelength range of the light emitted by the light emitting device covers both wavelength ranges of the visible light and the invisible light, and a spectral energy measured within the wavelength range of the visible light is less than 20% of a spectral energy measured within a wavelength range of 200 nm to 380 nm of remaining part of the invisible light.
An invisible light emitting device, comprising:
- a lighting unit configured to emit a first light;
- and
- a conversion material surrounding the lighting unit and having an excitation spectrum, wherein when a small part of the first light enters the conversion material, the conversion material converts the small part of the first light into a second light;
- wherein the first light is an invisible light, the second light is a visible light, a spectral energy of remaining part of the first light is at least 5 times of a spectral energy of the second light.
1 more element
Dependencies are inferred from the claim text.