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

Inactive Publication Date: 2011-11-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this patent document 1, only the wavelength of 530 nm (green) is disclosed as the specific wavelength of the additional LED.

Method used

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  • Illuminating device and vehicle headlamp
  • Illuminating device and vehicle headlamp
  • Illuminating device and vehicle headlamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0045] Refer to the following Figure 1 ~ Figure 3 One embodiment of the present invention will be described.

[0046] (Technical idea of ​​the present invention)

[0047] The inventor of the present invention thinks that, according to the above-mentioned Purkinje phenomenon, people's eyes are in a dark vision state at night, so by irradiating the front with light containing more blue-green spectrum, objects on the road can be seen more clearly ( obstacle). That is, the brightness of the light source represented by the light beam (lumen) is usually evaluated in the photopic state, so even if the numerical value is high, it is not necessarily suitable for the nighttime feeling in the scotopic state (you will not feel bright) . In addition, "being able to see an object more clearly" refers to an improvement in recognition of the shape (outline) of the object or the object itself, and does not necessarily require that the color of the object also looks bright.

[0048] Furthe...

Embodiment 1

[0108] Hereinafter, an example of the light emitting unit 5 will be specifically described. In this embodiment, Caα-SiAlON:Ce 3+ Phosphor (hereinafter referred to simply as Caα-SiAlON phosphor), CASN:Eu(CaAlSiN 3 :Eu 2+ ) phosphor (hereinafter referred to as CASN phosphor).

[0109] (Characteristics of Phosphor)

[0110] image 3 is Caα-SiAlON:Ce 3+ Phosphor and CaAlSiN 3 :Eu 2+Diagram of properties of phosphors. As shown in the figure, Caα-SiAlON: Phosphor emits fluorescence from blue to green, and its emission peak wavelength is 510nm. Moreover, the phosphor has a wide half-width of light emission of 110 nm, which can be fully applied to a wavelength region with high relative visibility in a scotopic state. In addition, the luminous efficiency of the above-mentioned phosphor is 58%, and the luminous efficiency is also high. In addition, since the Caα-SiAlON phosphor has high heat resistance, even when the light-emitting portion 5 is irradiated with high-density, hi...

Embodiment 2

[0132] Next, other examples of the light emitting unit 5 will be described. In this example, as in Example 1, a Caα-SiAlON phosphor was used as the first phosphor, and a CASN phosphor was used as the second phosphor. However, in this embodiment, the ratio of Caα-SiAlON phosphor, CASN phosphor, and silicone resin as a packaging material is 1:3.6:250, and the light emitting part 5 is formed with a diameter of 3 mm and a height of 5 mm. Laser light with a wavelength of 405 nm was irradiated to the light emitting unit 5, and the spectrum and chromaticity of the obtained illumination light were measured.

[0133] The results show that the chromaticity of the illumination light is Figure 4 The chromaticity represented by the coordinates of x=0.3102 and y=0.3189 in the graph of , satisfies the safety standards for road transport vehicles in Japan. Furthermore, the color temperature of the illumination light was 6700K, the average color rendering evaluation value Ra was 80.3, and t...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/10F21V9/10F21W101/10F21Y101/02F21V9/40
CPCG02B6/4206G02B6/0008H01S5/32341H01S5/005C09K11/7734H01S5/02212G02B6/0006H01S5/4031C09K11/0883F21S48/115G02B6/4403C09K11/7721F21S48/1225F21S41/285F21S41/16H01S5/0087H01S5/02251H01S5/4012F21S41/176C09K11/77218C09K11/77348
Inventor 岸本克彦横泽雄二友村好隆
Owner SHARP KK
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