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公开(公告)号：US20180299110A1
公开(公告)日：2018-10-18
申请号：US15950308
申请日：2018-04-11
Inventor： Hiroshi ASANO , Yosuke HONDA
CPC classification number: G02B26/008 , F21S10/007 , G03B21/14 , G03B21/204
Abstract: A phosphor wheel includes: a substrate; and a plurality of phosphor layers disposed apart from each other on the substrate along a circumferential direction. Each phosphor layer includes a first fluorescence emitter and a second fluorescence emitter that are disposed side by side along the circumferential direction and emit fluorescence having mutually different colors. A fluorescence efficiency of the second fluorescence emitter when the second fluorescence emitter is irradiated with excitation light is lower than a fluorescence efficiency of the first fluorescence emitter when the first fluorescence emitter is irradiated with the excitation light. In plan view, a blank portion is located adjacent to the second fluorescence emitter in the circumferential direction, the blank portion being a portion of the substrate where no phosphor layer is disposed. The phosphor wheel rotates to cause the second fluorescence emitter to be irradiated with the excitation light immediately after the blank portion.
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2.发明申请公开(公告)号：US20190146317A1
公开(公告)日：2019-05-16
申请号：US16183430
申请日：2018-11-07
Inventor： Kenta WATANABE , Toshio MORI , Hiroshi ASANO , Yosuke HONDA , Ran ZHENG , Sachiko AZUMA
Abstract: A wavelength conversion device is provided that includes: light-transmissive substrate that includes an incidence surface and an emission surface opposite the incidence surface, and emits, from the emission surface, laser light that enters the incidence surface; a phosphor layer that emits fluorescent light when excited by the laser light emitted from the emission surface; and a light diffuser layer between the emission surface and the phosphor layer. The light diffuser layer is, when viewed in a direction perpendicular to the emission surface, disposed only in a portion of a region in which the phosphor layer is disposed.
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公开(公告)号：US20180274737A1
公开(公告)日：2018-09-27
申请号：US15761944
申请日：2016-10-26
Inventor： Takeshi ABE , Shozo OSHIO , Hiroshi ASANO , Yosuke HONDA
Abstract: A light emitting device includes a first wavelength converter that contains a first phosphor that absorbs at least part of primary light radiated by a radiation source and converts the primary light absorbed into secondary light, and a second wavelength converter that contains a second phosphor that absorbs at least part of the secondary light and converts the secondary light absorbed into tertiary light. The lifetime of fluorescence emitted from the second phosphor is longer than the lifetime of fluorescence emitted from the first phosphor, and the light density of the secondary light, with which the second wavelength converter is irradiated, is lower than the light density of the primary light, with which the first wavelength converter is irradiated.
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公开(公告)号：US20190323664A1
公开(公告)日：2019-10-24
申请号：US16457956
申请日：2019-06-29
Inventor： Takeshi ABE , Shozo OSHIO , Hiroshi ASANO , Yosuke HONDA
Abstract: A light emitting device includes a first wavelength converter that contains a first phosphor that absorbs at least part of primary light radiated by a radiation source and converts the primary light absorbed into secondary light, and a second wavelength converter that contains a second phosphor that absorbs at least part of the secondary light and converts the secondary light absorbed into tertiary light. The lifetime of fluorescence emitted from the second phosphor is longer than the lifetime of fluorescence emitted from the first phosphor, and the light density of the secondary light, with which the second wavelength converter is irradiated, is lower than the light density of the primary light, with which the first wavelength converter is irradiated.
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