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Light emitting device and method for manufacturing same

A technology for light-emitting devices and light-emitting elements, which is applied to signal devices, lighting devices, semiconductor devices of light-emitting elements, etc., can solve the problems of reduced contrast of variable light distribution type headlamps, and achieve the effect of reducing image plane curvature.

Pending Publication Date: 2020-02-18
NICHIA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since such a light-emitting device is a surface light source, the farther it is from the central part of the light source to the peripheral part, the stronger the effect of field curvature of the projection lens will be, which may reduce the contrast of the variable light distribution headlamp.

Method used

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  • Light emitting device and method for manufacturing same
  • Light emitting device and method for manufacturing same
  • Light emitting device and method for manufacturing same

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no. 1 approach

[0101] The first embodiment will be described.

[0102] Figure 1A It is an end view showing the light emitting device of this embodiment. Figure 1B is its top view.

[0103] The configuration of the light emitting device 1 of this embodiment will be schematically described. The light emitting device 1 includes a substrate 10 , a plurality of light emitting elements 12 , a plurality of phosphor members 14 as wavelength conversion members, and a light reflection layer 16 . The light emitting element 12 is mounted on the substrate 10 . Each phosphor member 14 is provided on each light emitting element 12 and includes phosphor particles 15 . The light reflection layer 16 is arranged between adjacent phosphor members 14 . Moreover, the upper surface 19a of the aggregate 19 which consists of several fluorescent substance members 14 and the light reflection layer 16 is a concave curved surface.

[0104] The details will be described below. A substrate 10 is provided in the li...

no. 2 approach

[0137] Next, a second embodiment will be described.

[0138] Figure 7 It is an end view showing the light emitting device of this embodiment.

[0139] The difference between the light emitting device 2 of the present embodiment and the light emitting device 1 of the first embodiment described above is that a wavelength conversion member 24 is provided instead of the phosphor member 14 . The wavelength converting members 24 are provided in the same number as the light emitting elements 12 . Each wavelength conversion member 24 is provided with a phosphor member 21 , an adhesive layer 22 , and a glass member 23 .

[0140] Specifically, phosphor member 21 is bonded to the upper surface of each light emitting element 12 via adhesive layer 13 . The respective phosphor members 21 have substantially the same thickness. Phosphor particles 15 are dispersed in phosphor member 21 . The concentration of phosphor particles 15 is substantially equal between phosphor members 21 . The ...

no. 3 approach

[0156] Next, a third embodiment will be described.

[0157] Figure 9 It is an end view showing the light emitting device of this embodiment.

[0158] The difference between the light emitting device 3 of this embodiment and the light emitting device 1 of the first embodiment described above is that an adhesive layer 31 is provided instead of the adhesive layer 13 .

[0159] Phosphor particles 15 are contained in adhesive layer 31 . The concentration of the phosphor particles 15 in the adhesive layer 31 is high in the central portion of the light emitting device 3 in the X direction, and becomes lower toward both ends in the X direction. That is, compared to the concentration of phosphor particles 15 in the adhesive layer 31 arranged on the light emitting element 12 mounted on the central portion of the substrate 10 in the X direction, the concentration of the phosphor particles 15 in the light emitting elements mounted on both ends of the substrate 10 in the X direction Th...

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Abstract

The invention provides a light emitting device capable of reducing the influence of image surface bending and a manufacturing method of the same. The light emitting device 1 includes: a substrate 10;a plurality of light emitting elements 12 mounted on the substrate 10; a plurality of phosphor members 14 that are provided on the plurality of light emitting elements 12 and contain phosphor particles 15; and a plurality of light reflecting members 16 disposed between adjacent phosphor members 14 to reflect light emitted from the light emitting elements 12. The phosphor members 14 and the light reflecting members 16 are included in a collective body 19 that has a curved upper surface 19a having a concave shape.

Description

technical field [0001] Embodiments relate to a light emitting device and a method of manufacturing the same. Background technique [0002] In recent years, among automotive headlights, a light distribution variable headlight (Adaptive Driving Beam: ADB) has been developed, which irradiates light only to a selected area. By applying the variable light distribution headlamp to the high beam, for example, it is possible to emit light only to other areas without projecting light to areas where oncoming vehicles and preceding vehicles exist. Accordingly, it is possible to secure the field of view of the driver of the own vehicle without hindering the driving of other vehicles. [0003] In the light-emitting device used for the variable light distribution headlamp, a plurality of light-emitting diodes (Light Emitting Diode: LED) are mounted on the substrate, and the light emitted from each LED is directed only to a specific target through the optical system of the headlamp. dire...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/50H01L33/60H01L25/075
CPCH01L25/0753H01L33/505H01L33/60H01L2933/0058H01L2933/0041H01L33/46H01L33/508H01L33/44F21S41/143F21S41/153F21S41/36F21Y2115/10H01L33/502F21K9/64
Inventor 宫入洋远藤慎哉
Owner NICHIA CORP
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