# US 11,992,698 B2 · Light irradiation device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,992,698 B2 - Document ID: US11992698B2 - Status: Granted - Kind: B2 - Application number: 16/821,024 - Filed: 2020-03-17 - Published: 2020-09-24 - Granted: 2024-05-28 - Earliest claimed: 2019-03-19 - Assignees: Seoul Viosys Co., Ltd. - Applicants: Seoul Viosys Co., Ltd. - Inventors: Yeong Min Yoon; Hee Ho Bae; A Young Lee; Chung Hoon Lee - Web page: https://patentgrep.com/patent/US11992698B2 ## CPC - A61N 5/0624: {for eliminating microbes, germs, bacteria on or in the body} - A61N 5/0616: {Skin treatment other than tanning} - H05B 47/155: Coordinated control of two or more light sources - H05B 47/16: by timing means - A61N 2005/0626: {Monitoring, verifying, controlling systems and methods} - A61N 2005/0629: {Sequential activation of light sources} - A61N 2005/0642: {Irradiating part of the body at a certain distance} - A61N 2005/0645: {Applicators worn by the patient} - A61N 2005/0659: {infrared} - A61N 2005/0663: {Coloured light} - Y02B 20/40: Control techniques providing energy savings, e.g. smart controller or presence detection - A61N: ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY (measurement of bioelectric currents A61B; surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body A61B18/00; anaesthetic apparatus in general A61M; incandescent lamps H01K; infrared radiators for heating H05B) - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A light irradiation device includes a light source unit emitting a light to a wounded are of a skin and a controller controlling the light source unit. The light source unit includes a substrate, at least one first light source disposed on the substrate and emitting a first light in a blue wavelength band, and at least one second light source disposed on the substrate and emitting a second light in a red wavelength band to a near-infrared wavelength band. The first and second lights have different skin penetration depths from each other depending on a wavelength. ## Claims ### Claim 1 A light irradiation device, comprising: a light source unit emitting a light to a skin area to be treated; and a controller operable to control the light source unit; the light source unit comprising: a substrate: first light sources disposed on the substrate and emitting a first light in a blue wavelength band; and second light sources disposed on the substrate and emitting a second light in a red wavelength band to a near-infrared wavelength band, wherein the first light has a first skin penetration depth and the second light has a second skin penetration depth, the first skin penetration depth and the second skin penetration depth differing depending on a wavelength and the first skin penetration depth being smaller than the second skin penetration depth; wherein a first group of first light sources is disposed in a first region corresponding to a first portion of a surface of the substrate, and a group of the second light sources is disposed in a second region surrounding the first region and corresponding to a second portion of the surface of the substrate, wherein the first portion of the surface of the substrate is disposed at a center portion of the substrate and concaved relative to the second portion of the surface of the substrate such that the first group of first light sources is disposed on the first portion concaved from the second portion and the first group of second light sources is disposed on the second portion protruding from the first portion; wherein a second group of first light sources is disposed in a third region located between the first region and the second region and corresponding to a third portion of the surface of the substrate and wherein the first portion, the third portion, and the second portion are sequentially arranged in a direction away from the center portion of the substrate such that all of second light sources in the group of second light sources are disposed along an edge of the substrate and located in the second region entirely surrounding the third region; the first region is spaced apart from the skin area to be treated farther than the second region is; wherein in the first region, direct application of the first light with a first predetermined dose, to the skin area to be treated, causes the first light to penetrate through the skin area to be treated and reactive oxygen species (ROS) to be produced and accumulated in cells of bacteria within the first skin penetration depth, thereby resulting in demise of the bacteria; in the second region, direct application of the second light with a second predetermined dose, to an area wider than the skin area to be treated by the first light and in an open state, causes the second light to penetrate through the skin area to be treated and blood vessels to be dilated and promote a blood circulation in the second skin penetration depth, thereby improving a blood flow and promoting immune response, wherein the third portion of the surface has an inclined surface connecting the first region and the second region. ### Claim 2 (depends on 1) The light irradiation device of claim 1, wherein the first light has the first skin penetration depth equal to or greater than about 1.0 mm. ### Claim 3 (depends on 2) The light irradiation device of claim 2, wherein the second light has the second skin penetration depth equal to or greater than about 4.3 mm. ### Claim 4 (depends on 1) The light irradiation device of claim 1, wherein the first light has a wavelength band of about 370 nm to about 500 nm. ### Claim 5 (depends on 4) The light irradiation device of claim 4, wherein the first light has a wavelength band of about 385 nm to about 435 nm. ### Claim 6 (depends on 4) The light irradiation device of claim 4. wherein the second light has a wavelength band of about 610 nm to about 940 nm. ### Claim 7 (depends on 1) The light irradiation device of claim 1, wherein both the first light and the second light are irradiated for a predetermined time period. ### Claim 8 (depends on 1) The light irradiation device of claim 1, wherein the first light is irradiated for a first time, and the second light is irradiated for a second time longer than the first time. ### Claim 9 (depends on 8) The light irradiation device of claim 8, wherein the second light starts to be irradiated before the irradiation of the first light is completed, and at least a portion of the first time overlaps with at least a portion of the second time. ### Claim 10 (depends on 9) The light irradiation device of claim 9, wherein the second light is irradiated continuously. ### Claim 11 (depends on 7) The light irradiation device of claim 7, wherein the first light is irradiated at intervals and the first light is discontinuous. ### Claim 12 (depends on 7) The light irradiation device of claim 7, wherein the first light, the second light, or both are periodically irradiated. ### Claim 13 (depends on 1) The light irradiation device of claim 1, wherein the light irradiation device is for treatment; and wherein the substrate faces the skin area to be treated and comprises the first region and the second region; and the first region and the second region are concentrically arranged such that the second region surrounds the first region. ### Claim 14 (depends on 1) The light irradiation device of claim 1, wherein an irradiation area of the first light on the skin area to be treated is smaller than an irradiation area of the second light on the skin. ### Claim 15 (depends on 1) The light irradiation device of claim 1, wherein the second predetermined dose is about a half of the first predetermined dose. ### Claim 16 A light irradiation device comprising: first light sources emitting a first light in a blue wavelength band; second light sources emitting a second light in a red wavelength band to a near-infrared wavelength band; and a controller configured to control the first and second light sources, wherein the first light has a first skin penetration depth and the second light has a second skin penetration depth, the first skin penetration depth and the second skin penetration depth differing depending on a wavelength; the first skin penetration depth being smaller than the second skin penetration depth; wherein a first group of first light sources is disposed in a first region corresponding to a first portion of a surface of a substrate, a group of the second light sources is disposed in a second region surrounding the first region and corresponding to a second portion of the surface of the substrate, wherein the first portion of the surface of the substrate is disposed at a center portion of the substrate and concaved relative to the second portion of the surface of the substrate such that the first group of first light sources is disposed on the first portion concaved from the second portion and the first group of second light sources is disposed on the second portion protruding from the first portion; wherein a second group of first light sources is disposed in a third region located between the first region and the second region and corresponding to a third portion of the surface of the substrate and wherein the first portion, the third portion, and the second portion are sequentially arranged in a direction away from the center portion of the substrate such that all of second light sources in the group of second light sources are disposed along an edge of the substrate and located in the second region entirely surrounding the third region; the first region is spaced apart from a skin area to be treated farther than the second region is; wherein in the first region, a direct application of the first light with a first predetermined dose, to a skin area to be treated, causes the first light to penetrate through the skin area to be treated and reactive oxygen species (ROS) to be produced and accumulated in cells of bacteria within the first skin penetration depth, thereby resulting in demise of the bacteria; in the second region, direct application of the second light with a second predetermined dose, to an area wider than the skin area to be treated by the first light and in an open state, causes the second light to penetrate through the skin area to be treated and blood vessels to be dilated and promote a blood circulation in the second skin penetration depth, thereby improving a blood flow and promoting immune response, wherein the third portion of the surface has an inclined surface connecting the first region and the second region. ### Claim 17 (depends on 16) The light irradiation device of claim 16, wherein the first light has the skin penetration depth equal to or greater than about 0.8 mm, and the second light has the skin penetration depth equal to or greater than about 4.3 mm; wherein the substrate faces a skin area to be treated and comprises a first region in which the first light source is disposed and a second region in which the second light source is disposed; and the first region and the second region concentrically arranged. ### Claim 18 (depends on 17) The light irradiation device of claim 17, wherein the first light has a wavelength band of about 370 nm to about 500 nm. ### Claim 19 (depends on 16) The light irradiation device of claim 16, wherein the first light is irradiated for a first time, and the second light is irradiated for a second time longer than the first time; and the second light starts to be irradiated before the irradiation of the first light is completed, and at least a portion of the first time overlaps with at least a portion of the second time. ### Claim 20 (depends on 16) The light irradiation device of claim 16, wherein the second predetermined dose is about a half of the first predetermined dose.