# US 12,007,090 B2 · Light source unit, and light emitting device for mobile body > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,007,090 B2 - Document ID: US12007090B2 - Status: Granted - Kind: B2 - Application number: 18/160,805 - Filed: 2023-01-27 - Published: 2023-06-08 - Granted: 2024-06-11 - Earliest claimed: 2019-04-12 - Assignees: Ichikoh Industries, Ltd. - Applicants: Ichikoh Industries, Ltd. - Inventors: Harumi Mochimaru - Web page: https://patentgrep.com/patent/US12007090B2 ## CPC - F21S 43/239: plate-shaped - F21S 43/252: {Two or more successive light guides} - F21S 43/14: Light emitting diodes [LED] - F21S 43/16: Light sources where the light is generated by photoluminescent material spaced from a primary light generating element - F21S 43/245: emitting light from one or more of its major surfaces - F21S 43/246: {having two or more output branches} - F21S 43/247: with a single light source being coupled into the light guide - F21S 43/253: {Two or more juxtaposed light guides} - F21S 43/255: {Filters} - F21S 43/281: {Materials thereof; Structures thereof; Properties thereof; Coatings thereof} - F21S 43/31: Optical layout thereof - F21S 43/331: {Semi-transparent reflectors} - F21S 43/40: characterised by the combination of reflectors and refractors - F21S 43/402: {Total internal reflection [TIR] collimators} - F21S 45/10: Protection of lighting devices (cooling of lighting devices F21S45/40; waterproofing of lighting devices F21S45/50) - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS ## Abstract A light source unit includes: a light source part that emits excitation light; a light emitting part that emits generated light by being irradiated with the excitation light; a support part that guides the excitation light to the light emitting part while supporting the light emitting part; and a reflective part provided on a back surface of the support part, the back surface being on a side opposite to an emission direction of the generated light. ## Claims ### Claim 1 A vehicular lamp with a lamp chamber comprising: a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light; a convex reflective part; a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein: the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission, the light emitting layer is provided on an inner surface of the lens, and the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp functions as a tail lamp. ### Claim 2 (depends on 1) A vehicular lamp of claim 1, further comprising: a light source part including the light source, wherein: the light source is provided such that a light emitting surface of the light source faces the convex reflective part, and the light source part is prevented from being visually recognized from outside of the vehicle. ### Claim 3 (depends on 2) A vehicular lamp of claim 2, further comprising: a support substrate on which the light source is mounted, and a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member. ### Claim 4 (depends on 1) A vehicular lamp of claim 1, further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air. ### Claim 5 (depends on 4) A vehicular lamp of claim 4, further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent. ### Claim 6 (depends on 1) A vehicular lamp of claim 1, wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light. ### Claim 7 (depends on 1) A vehicular lamp of claim 1, wherein the light emitting layer includes at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material. ### Claim 8 (depends on 1) A vehicular lamp of claim 1, wherein the light emitting layer is formed in the form of a thin film including organic material. ### Claim 9 A vehicular lamp with a lamp chamber comprising: a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light; a convex reflective part; a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein: the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission, and the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp functions as a tail lamp. ### Claim 10 (depends on 9) A vehicular lamp of claim 9, further comprising: a light source part including the light source, wherein: the light source is provided such that a light emitting surface of the light source faces the convex reflective part, and the light source part is prevented from being visually recognized from outside of the vehicle. ### Claim 11 (depends on 10) A vehicular lamp of claim 10, further comprising: a support substrate on which the light source is mounted, and a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member. ### Claim 12 (depends on 9) A vehicular lamp of claim 9, wherein the light emitting layer is provided on an inner surface of the lens. ### Claim 13 (depends on 12) A vehicular lamp of claim 12, further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air. ### Claim 14 (depends on 13) A vehicular lamp of claim 13, further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent. ### Claim 15 (depends on 9) A vehicular lamp of claim 9, wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light. ### Claim 16 (depends on 9) A vehicular lamp of claim 9, wherein the light emitting layer includes at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material. ### Claim 17 (depends on 9) A vehicular lamp of claim 9, wherein the light emitting layer is formed in the form of a thin film including organic material. ### Claim 18 A vehicular lamp with a lamp chamber comprising: a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light; a convex reflective part; a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, and a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, wherein: the wavelength of the excitation light is shorter than the wavelength of the generated light, and the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission so that the vehicular lamp functions as a lamp. ### Claim 19 (depends on 18) A vehicular lamp of claim 18, further comprising: a light source part including the light source, wherein: the light source is provided such that a light emitting surface of the light source faces the convex reflective part and the light source part is prevented from being visually recognized from outside of the vehicle. ### Claim 20 (depends on 19) A vehicular lamp of claim 19, further comprising: a support substrate on which the light source is mounted, and a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member. ### Claim 21 (depends on 18) A vehicular lamp of claim 18, wherein the light emitting layer is provided on an inner surface of the lens. ### Claim 22 (depends on 21) A vehicular lamp of claim 21, further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air. ### Claim 23 (depends on 22) A vehicular lamp of claim 22, further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent. ### Claim 24 (depends on 18) A vehicular lamp of claim 18, wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light. ### Claim 25 (depends on 18) A vehicular lamp of claim 18, wherein the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp function as a tail lamp. ### Claim 26 (depends on 18) A vehicular lamp of claim 18, wherein the light emitting layer includes at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material. ### Claim 27 (depends on 18) A vehicular lamp of claim 18, wherein the light emitting layer is formed in the form of a thin film including organic material. ### Claim 28 A vehicular lamp with a lamp chamber comprising: a light source for emitting excitation light, the light source having a light emitting surface which emits a Lambertian distribution of said excitation light: a light emitting layer including organic material or inorganic material and for emitting generated light by being irradiated with the excitation light, a lens through which the generated light travels to the outside of the lamp chamber so that the generated light is emitted from the vehicular lamp, a convex reflective part, and a light source part including the light source, wherein: the wavelength of the excitation light is shorter than the wavelength of the generated light, the light source is provided such that a light emitting surface of the light source faces the convex reflective part and the light source part is prevented from being visually recognized from outside of the vehicle, and the excitation light from the light source is dispersed by the convex reflective part and travels to the light emitting layer so that the light emitting layer emits the generated light and performs surface emission so that the vehicular lamp functions as a lamp. ### Claim 29 (depends on 28) A vehicular lamp of claim 28, further comprising: a support substrate on which the light source is mounted, and a heat radiating member for radiating heat from the light source, wherein the support substrate is provided on the heat radiating member. ### Claim 30 (depends on 28) A vehicular lamp of claim 28, wherein the light emitting layer is provided on an inner surface of the lens. ### Claim 31 (depends on 30) A vehicular lamp of claim 30, further comprising a sealing part formed of a material that transmits the excitation light and the generated light, wherein the sealing part is provided on the inner side of the light emitting layer so as to cover an entire surface of the light emitting layer and cooperates with the lens to prevent the light emitting layer from being exposed to air. ### Claim 32 (depends on 31) A vehicular lamp of claim 31, further comprising a filter part provided on an outer surface of the lens, wherein the filter part is formed in the form of thin film by applying a coating having a function of UV cutting to an outer surface of the lens and is transparent. ### Claim 33 (depends on 28) A vehicular lamp of claim 28, wherein the light emitting layer is transparent in a state in which there is no irradiation with the excitation light. ### Claim 34 (depends on 28) A vehicular lamp of claim 28, wherein the light emitting layer including at least one material from a red phosphorescent material, a blue phosphorescent material, a yellow phosphorescent material, and a green phosphorescent material. ### Claim 35 (depends on 28) A vehicular lamp of claim 28, wherein the light emitting layer is formed in the form of a thin film including organic material. ### Claim 36 (depends on 28) A vehicular lamp of claim 28, wherein the light emitting layer is excited by being irradiated with blue excitation light to emit red generated light and the vehicle lamp function as a tail lamp.