Lighting device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorKazuyuki YAMAE
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Abstract
A lighting device includes a laser light source that emits laser light, a wavelength converter that converts a wavelength of the laser light and emits wavelength-converted light, and a linear light guide that is elongated and guides the wavelength-converted light emitted by the wavelength converter and introduced through a longitudinal end surface. The linear light guide includes a lateral surface that emits the wavelength-converted light guided by the linear light guide. A proportion of the wavelength-converted light emitted by the lateral surface gradually increases with an increase in optical path length in the linear light guide.
Claims10
A lighting device, comprising:
- a laser light source that emits laser light;
- a wavelength converter that converts a wavelength of the laser light and emits wavelength-converted light;
- and
- a linear light guide that is elongated and guides the wavelength-converted light;
- emitted by the wavelength converter and introduced through a longitudinal end surface,
- wherein the linear light guide includes a lateral surface which emits, from the linear light guide, the wavelength-converted light guided by the linear light guide, and
- a proportion of the wavelength-converted light emitted by the lateral surface gradually increases with an increase in optical path length in the linear light guide.
The lighting device according to clams 1, wherein
- the lateral surface comprises an uneven surface structure defined by recesses in or protrusions on the lateral surface of the linear light guide, and
- in a plan view of the recesses or the protrusions in the uneven surface structure, each of the recesses or the protrusions has approximately a same inner diameter or outer diameter.
A lighting device, comprising:
- a laser light source that emits laser light;
- a wavelength converter that converts a wavelength of the laser light and emits wavelength-converted light;
- and
- a linear light guide that is elongated and guides the wavelength-converted light emitted by the wavelength converter and introduced through a longitudinal end surface,
- wherein the linear light guide includes a light extractor which emits, from a lateral surface of the linear light guide, the wavelength-converted light guided by the linear light guide, and
- a proportion of the wavelength-converted light emitted by the light extractor gradually increases with an increase in optical path length in the linear light guide.
Dependencies are inferred from the claim text.