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公开(公告)号：US11692699B2
公开(公告)日：2023-07-04
申请号：US17624081
申请日：2020-07-09
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Yosuke Yatsuya , Ryuichi Arakawa , Toshiyuki Sakurai , Tomoo Tanaka
IPC: F21V29/503 , F21V9/32
CPC classification number: F21V29/503 , F21V9/32
Abstract: A wavelength conversion member includes a ceramic fluorescent body for converting a wavelength of incident light, a heat radiation member for radiating heat of the ceramic fluorescent body to an outside atmosphere, and a solder layer for joining together the ceramic fluorescent body and the heat radiation member. The solder layer includes a joining portion disposed between the ceramic fluorescent body and the heat radiation member and a protruding portion protruding outward from an outer circumferential portion of the ceramic fluorescent body. The protruding portion is spaced apart from a side surface formed on the outer circumferential portion of the ceramic fluorescent body. In the solder layer, the maximum value of thickness of the protruding portion is greater than the average value of thickness of the joining portion.
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公开(公告)号：US11994284B2
公开(公告)日：2024-05-28
申请号：US18245275
申请日：2021-12-13
Applicant: NGK SPARK PLUG CO., LTD.
Inventor： Yosuke Yatsuya , Toshiyuki Sakurai , Shohei Takaku , Hiroki Yamauchi , Tomoo Tanaka , Hiroki Takeuchi , Shinji Ban
Abstract: There is provided a wavelength conversion member including: a fluorescent body and a reflective film. The fluorescent body is configured to emit fluorescence by an excitation light and has an incident surface into which the excitation light comes and a rear surface which faces the incident surface. The reflective film is arranged on a side of the rear surface of the fluorescent body and includes a metal layer and ceramic particles dispersed in the metal layer. The ceramic particles are crystalline, and a melting point of the ceramic particles is higher than a melting point of a metal constructing the metal layer.
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