Illuminating device and vehicle headlamp

A technology of lighting devices and phosphors, applied in lighting devices, fixed lighting devices, components of lighting devices, etc., to achieve the effect of high visual sensitivity
CN102252247AInactive Publication Date: 2011-11-23SHARP KK
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHARP KK
Publication Date
2011-11-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

A headlamp (1) includes: laser diodes (2)that emit excitation light; and a light emitting part (5) that emits light upon receiving the excitation light emitted from the laser diodes(2), the light emitting part(5) containing a first fluorescent material and a second fluorescent material, the first fluorescent material having its emission spectrum peak in a range of not less than 500 nm but not more than 520 nm, the second fluorescent material having an emission spectrum peak which is different from the emission spectrum peak of the first fluorescent material. In a spectrum of the light emitted from the light emitting part (5), a luminous intensity at the emission spectrum peak of the first fluorescent material is higher than a luminous intensity in an emission spectrum covering a range of not less than 540 nm but not more than 570 nm. This allows the headlamp (1) to emit illumination light which achieves a high visibility of an irradiation target at least in a dark place.
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Description

technical field

[0001] The present invention relates to a lighting device including an excitation light source and a light emitting unit that emits fluorescence according to the excitation light emitted from the excitation light source, and particularly relates to a vehicle headlight. Background technique

[0002] At present, white LED (Light Emitting Diode; Light Emitting Diode) vehicle headlights, which are composed of blue light emitting diodes and phosphors, are beginning to be put into practical use. Compared with current light sources such as halogen lamps and HID (High Intensity Discharge) lamps, by using light-emitting diodes, a significantly longer life can be achieved. Moreover, it is expected to achieve lower power consumption than HID lamps in the long run.

[0003] Patent Document 1 discloses an example of such a headlight. The vehicle headlight described in Patent Document 1 includes a plurality of LED chips capable of emitting light of different colors. Mor...

Claims

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