Light emitting device, lighting device, and vehicle headlamp
A light-emitting device and headlight technology, which is applied in the direction of lighting devices, fixed lighting devices, lighting device components, etc., can solve the problems of reduced conversion efficiency and low conversion efficiency, and achieve the effect of reducing the possibility of temperature quenching
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Embodiment approach 1
[0051] based on the following Figure 1 to Figure 5 One embodiment of the present invention will be described.
[0052]
[0053] First, refer to figure 2 To illustrate the technical idea of the present invention. figure 2 is a type map of the spatial distribution of light intensity of excitation light.
[0054] In the concentrating optical system, the size of the converging point depends on the divergence angle of the excitation light source and the size of the excitation light source. Therefore, the size of the excitation light source is very important in the concentrating optical system.
[0055] When a semiconductor laser is used as an excitation light source, the spatial distribution of the light intensity of the laser emitted by the semiconductor laser is generally a Gaussian distribution ( figure 2 leftmost beam type in ). In a Gaussian distribution, the energy intensity of the area illuminated by the peak domain (top) portion of the beam is different from th...
Embodiment approach 2
[0135] based on the following Image 6 Next, other embodiments of the present invention will be described. Components that are the same as those in Embodiment 1 are given the same symbols, and description thereof will be omitted.
[0136] In the present embodiment, the headlight 1 includes a laser element 20 instead of the laser element 2 . Other structures are the same as Embodiment 1.
[0137]
[0138] Image 6 It is a schematic configuration diagram of another laser element 20 applicable to the headlight 1 . In the laser element 20 , the side surfaces of the optical rod 23 are coated with an aluminum film 28 .
[0139] Therefore, it is possible to prevent the laser light from leaking from the side of the optical rod 23 when passing through the inside of the optical rod 23 .
[0140] The film covering the side of the optical rod 23 is not limited to an aluminum film, and may be a reflective film made of other high-reflectivity materials.
Embodiment approach 3
[0142] based on the following Figure 7 Next, other embodiments of the present invention will be described. Components that are the same as in Embodiments 1 and 2 are assigned the same symbols, and description thereof will be omitted.
[0143] In the present embodiment, the headlight 1 includes a laser element 40 instead of the laser element 2 . Other structures are the same as Embodiments 1 and 2.
[0144]
[0145] Figure 7 It is a schematic configuration diagram of another laser element 40 applicable to the headlight 1 . The laser element 40 includes a first optical member 29 instead of the optical rod 23 . The first optical member 29 in this embodiment is a hollow member and has a plurality of inner surfaces 29c as reflection surfaces.
[0146] The material and structure of the first optical member 29 in this embodiment are not particularly limited, and may be, for example, a hollow square pillar (for example, a square pillar) formed with a plurality of mirror surfa...
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