Solid-State Lighting Device
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United States of America Patent
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N/A
Issued Date -
Jun 25, 2015
app pub date -
Dec 21, 2012
filing date -
Mar 22, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A solid-state lighting device includes light source, light emitting, light receiving and light guiding sections, and a protection circuit. The light source section has a semiconductor laser including a light emitting layer and a driving circuit. The light source section emits light with a bluish purple to blue wavelength range. The light emitting section includes a heat conduction part which includes a wavelength conversion layer absorbs the light and emits wavelength-converted light, and an optical part which guides the light. The light receiving section detects returning light from the optical part. The light guiding section guides the light from the light source section toward the optical part, and guides returning light therefrom toward the light receiving section. The protection circuit outputs a driving stop signal to the driving circuit, which stops driving the semiconductor laser, if the amount of the returning light detected is not within a prescribed range.
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