Light irradiation apparatus using tapered light guide

Abstract

A light irradiation device using a tapered light guide according to one embodiment of the present invention includes: a light source unit; and a tapered light guide that transmits light generated from the light source unit to a certain length and radiates the transmitted light to spread at a predetermined angle.

Description

Technology Field

[0001] The present invention relates to a light irradiation device using a tapered light guide. Background Technology

[0002] Low-power laser therapy, which involves irradiating the skin with low-output lasers, is known to be effective in improving blood circulation, regenerating damaged tissues, and treating skin ulcers. When laser light is applied to the human body, blood vessels expand and blood circulation improves, allowing damaged cell tissues to recover to normal.

[0003] Meanwhile, irradiating hair roots with laser light activates hair follicle cells to promote hair growth and simultaneously prevent hair loss; related products have already been developed and are being sold. Laser or LED irradiation devices designed for hair growth, strengthening, and hair loss prevention utilize an arrangement of multiple lasers or LEDs to irradiate the scalp.

[0004] In order to increase the efficiency of light irradiation, Patent Document 1 uses an optical fiber composed of a coating layer, cladding, and a core to enable direct irradiation from a light source to the scalp.

[0005] In the case of Patent Document 2, the light-emitting element is mounted on the end of a comb-shaped projection to prevent light energy from being blocked by residual hair on the scalp.

[0006] However, in the case of Patent Document 1, an optical waveguide of the optical fiber type is used to overcome the blockage of light waves by residual hair, so light waves are transmitted from the light source to the end of the scalp contact surface, allowing for effective light transmission at the scalp contact surface, but it is difficult to propagate evenly across the scalp, and for this reason, it is an idea suitable for a comb-shaped light irradiation device rather than a fixed type.

[0007] In addition, in the case of Patent Document 1, optical energy is transmitted through an optical fiber composed of a core layer and a cladding layer, so optical coupling from the optical device to the optical fiber is required, but there are difficulties in terms of coupling efficiency as the core size of the optical fiber ranges from a few micrometers in the case of single mode to several hundred micrometers in the case of multimode.

[0008] In addition, in the case of Patent Document 2, an attempt was made to overcome the problem of light energy being blocked by residual hair by mounting a light-emitting element at the tip of a comb-shaped protrusion; however, there is a problem in that the characteristics of the hair differ depending on the location on the scalp, making it impossible to select an appropriate irradiation method, and since the light-emitting element is mounted at the tip of the protrusion, it is inevitably limited to a specific wavelength, making it impossible to irradiate light energy of various wavelengths. Furthermore, since the light-emitting element is mounted at the tip of the protrusion and light is transmitted directly from the light-emitting element, there is a geometric shape of the light-emitting element and a divergence angle determined by that shape, which limits the transmission of arbitrary light energy.

[0009] As mentioned above, conventionally, light energy was blocked by hair, making it difficult to properly transmit light energy from the light source to the scalp. Furthermore, since hair characteristics vary depending on hair density, growth level, and location, various light transmission methods tailored to these conditions are required; however, conventional technology was structured to be effective only for light energy transmitted through the hair, regardless of whether hair was present or not. Prior art literature

[0010] (Patent Document 0001) KR 10-1092121 B1(Patent Document 0002) KR 10-0995427 B1 The problem to be solved

[0011] The problem that the present invention aims to solve is to provide a light irradiation device using a tapered light guide that utilizes the internal total reflection phenomenon of light to adjust the length of light energy transmission and the degree of light energy diffusion according to the degree of tapering, thereby enabling the delivery of customized light energy to the scalp according to the hair thickness or the position of the scalp. means of solving the problem

[0012] A light irradiation device using a tapered light guide according to an embodiment of the present invention for solving the above problem is,

[0013] Light source unit; and

[0014] It includes a tapered light guide that transmits light generated from the light source unit up to a certain length and radiates the transmitted light to spread at a predetermined angle.

[0015] In a light irradiation device using a tapered light guide according to one embodiment of the present invention, the tapered light guide is,

[0016] A light transmission unit for transmitting light generated from the above light source unit to a certain length through internal total reflection; and

[0017] It may include a radiating part for irradiating the scalp so that the transmitted light spreads at a predetermined angle.

[0018] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the tapered light guide includes an incident portion into which light generated from the light source portion is incident.

[0019] The light transmission part of the above-described tapered light guide is a part where light incident through the above-described incident part is transmitted up to a certain length through internal total reflection, and

[0020] The radiating part of the above tapered light guide may be a part that emits light transmitted through the above light transmission part up to a certain length, as the light does not satisfy the internal total reflection condition.

[0021] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the angle at which the light spreads is larger as the tapered angle of the tapered light guide is larger, and smaller as the tapered angle is smaller, and

[0022] The length of the above tapered light guide may be shorter as the tapered angle is larger, and longer as the tapered angle is smaller.

[0023] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the tapered light guide is formed as one of a cone, an elliptical cone, and an n-sided pyramid, and n may be an integer greater than or equal to 3.

[0024] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the tapered light guide is formed as a cone or an n-sided pyramid placed on top of a column among a cylinder, an elliptical cylinder, and an n-sided column, and the column and the cone or n-sided pyramid are directly connected or connected in two or more stages, and n may be an integer greater than or equal to 3.

[0025] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the end of the portion of the tapered light guide where light is emitted may be formed in one of a 1-point shape, a sphere, an ellipsoid, or a polygon.

[0026] In addition, a light irradiation device using a tapered light guide according to one embodiment of the present invention may further include a scattering part formed of a scattering material for scattering light at the end of the part of the tapered light guide where light is emitted.

[0027] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the light source may include at least one of a laser diode, a VCSEL (Vertical Cavity Surface Emitting Laser), and a light-emitting diode.

[0028] In addition, a light irradiation device using a tapered light guide according to one embodiment of the present invention may further include a support member for supporting the light source member and the tapered light guide.

[0029] In addition, a light irradiation device using a tapered light guide according to one embodiment of the present invention may further include a light source driver for controlling the operation of the light source unit; and a control unit for controlling the operation of the light source driver.

[0030] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the light source part is,

[0031] A light source that generates light; and

[0032] It may include an optical system for directing light generated from the light source to the tapered light guide.

[0033] In addition, a light irradiation device using a tapered light guide according to one embodiment of the present invention for solving the above problem is,

[0034] Multiple light source units; and

[0035] It includes a plurality of tapered light guides that transmit light generated from the plurality of light source units up to a certain length and radiate the transmitted light to spread at a predetermined angle.

[0036] In a light irradiation device using a tapered light guide according to one embodiment of the present invention, each of the plurality of tapered light guides is,

[0037] A light transmission unit for transmitting light generated from the above light source unit to a certain length through internal total reflection; and

[0038] It may include a radiating part for irradiating the scalp so that the transmitted light spreads at a predetermined angle.

[0039] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the tapered light guide includes an incident portion into which light generated from the light source portion is incident.

[0040] The light transmission part of the above-described tapered light guide is a part where light incident through the above-described incident part is transmitted up to a certain length through internal total reflection, and

[0041] The radiating part of the above tapered light guide may be a part that emits light transmitted through the above light transmission part up to a certain length, as the light does not satisfy the internal total reflection condition.

[0042] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the angle at which the light spreads is larger as the tapered angle of the tapered light guide is larger, and smaller as the tapered angle is smaller, and

[0043] The length of the above tapered light guide may be shorter as the tapered angle is larger, and longer as the tapered angle is smaller.

[0044] In addition, a light irradiation device using a tapered light guide according to one embodiment of the present invention comprises: a plurality of light source parts and a support part that supports the plurality of tapered light guides;

[0045] A light source driver for controlling the operation of the plurality of light source units; and

[0046] It may further include a control unit for controlling the operation of the plurality of light source drivers.

[0047] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the plurality of light source units are formed into a plurality of light source groups, and the plurality of tapered light guides are formed into a plurality of tapered light guide groups,

[0048] Each tapered light guide belonging to the same tapered light guide group has the same tapered angle, and

[0049] The tapered angles between the above tapered light guide groups may differ from each other.

[0050] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the control unit,

[0051] The operation of the plurality of light source drivers can be controlled so that light of different intensities is generated from the plurality of light source groups.

[0052] In addition, in a light irradiation device using a tapered light guide according to one embodiment of the present invention, the plurality of light source groups can emit light of different wavelengths. Effects of the invention

[0053] According to a light irradiation device using a tapered light guide according to one embodiment of the present invention, the light energy is divided into a light energy delivery section and a radiation section, so light energy can be effectively delivered to the scalp without obstructing the light energy of the hair.

[0054] In addition, when using conventional optical fibers, there was a disadvantage in that light energy could not be transmitted evenly because it merely served to transmit light energy through the hair to the scalp. However, a light irradiation device using a tapered light guide according to one embodiment of the present invention has a radiating part that radiates the transmitted light to spread at a predetermined angle, so that light energy transmitted through the hair can be effectively transmitted to the scalp.

[0055] In addition, according to a light irradiation device using a tapered light guide according to one embodiment of the present invention, a tapered light guide is used to avoid interference caused by hair when delivering light energy of a laser or LED to the scalp, and a cut-off area where internal total reflection collapses is determined by the length of the tapered light guide or the tapered angle of the tapered light guide, thereby allowing light energy to be effectively delivered to the scalp through the hair layer.

[0056] In addition, according to a light irradiation device using a tapered light guide according to one embodiment of the present invention, by creating a tapered light guide array, light energy can be evenly transmitted through the hair to the scalp.

[0057] In addition, according to a light irradiation device using a tapered light guide according to one embodiment of the present invention, various combinations of tapered light guides with different lengths depending on the length of the hair can be arranged, so that customized light energy can be delivered to the scalp depending on the length of the hair or the position of the scalp. Brief explanation of the drawing

[0058] FIG. 1 is a drawing illustrating a light irradiation device using a tapered light guide according to a first embodiment of the present invention. FIGS. 2(a) to 2(c) are drawings illustrating the degree of light spreading according to the tapered angle of a tapered light guide. FIGS. 3(a) to 3(e) are drawings illustrating the results of a LightTools simulation, showing the degree of light spreading according to the length of a tapered light guide. FIG. 4 is a drawing illustrating a light irradiation device using a tapered light guide according to a second embodiment of the present invention, in which a light irradiation device is formed with a tapered light guide array. FIG. 5 is a drawing illustrating a light irradiation device using a tapered light guide according to a third embodiment of the present invention, wherein tapered light guides of various lengths are arranged according to the length of the hair. FIG. 6 is a drawing illustrating a light irradiation device using a tapered light guide according to a fourth embodiment of the present invention. Specific details for implementing the invention

[0059] The objects, specific advantages, and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments in conjunction with the accompanying drawings.

[0060] Prior to this, terms and words used in this specification and claims shall not be interpreted in their ordinary and dictionary meanings, but shall be interpreted in a meaning and concept consistent with the technical spirit of the invention, based on the principle that the inventor can appropriately define the concept of the terms to best describe his invention.

[0061] It should be noted that in assigning reference numbers to the components of each drawing in this specification, identical components are given the same number as much as possible, even if they are shown in different drawings.

[0062] In addition, terms such as "first," "second," "one side," and "other side" are used to distinguish one component from another, and the components are not limited by these terms.

[0063] Hereinafter, in describing the present invention, detailed descriptions of related known technologies that may unnecessarily obscure the essence of the invention are omitted.

[0064] A light irradiation device using a tapered light guide according to one embodiment of the present invention utilizes a tapered light guide utilizing the internal total reflection phenomenon of light to adjust the length of light energy transmission and the degree of light energy spreading according to the degree of tapering, thereby delivering customized light energy to the scalp according to the degree of hair or the position of the scalp.

[0065] A light irradiation device using a tapered light guide according to one embodiment of the present invention is an optical device that effectively transmits light energy to the scalp while avoiding the hair by using a tapered light guide to transmit light energy from a light source, such as a VCSEL, laser diode, or LED, to the scalp while avoiding the area where hair is present, and also effectively spreads it.

[0066] The tapered light guide has a tapered angle that utilizes total internal reflection, and utilizes the phenomenon where total internal reflection of light is interrupted from the part that does not satisfy the total internal reflection condition. By arbitrarily adjusting the tapered angle, it has the advantage of being applicable according to the characteristics of the hair in the scalp area.

[0067] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0068] Referring to FIG. 1, a light irradiation device using a tapered light guide according to a first embodiment of the present invention includes a light source unit (100) and a tapered light guide (102) that transmits light generated from the light source unit (100) to a certain length and radiates the transmitted light to spread at a predetermined angle.

[0069] In addition, the light irradiation device using a tapered light guide according to the first embodiment of the present invention further includes a light source driver (110) for controlling the operation of the light source unit (100) and a control unit (112) for controlling the operation of the light source driver (110).

[0070] The light source unit (100) may include at least one of a laser diode, a VCSEL (Vertical Cavity Surface Emitting Laser), and a light-emitting diode.

[0071] The tapered light guide (102) includes a light transmission unit (104) for transmitting light generated from the light source unit (100) to a certain length through internal total reflection, and a radiation unit (106) for irradiating the transmitted light onto the scalp to spread it at a predetermined angle.

[0072] The light transmission part (104) and the radiation part (106) are formed integrally from a single material.

[0073] The above tapered light guide (102) is divided into an input section (101) into which light energy is irradiated from a light source or an optical system using light having a specific radiation angle, a light transmission section (104) into which the input light energy is transmitted to a certain length through internal total reflection, and a radiation section (106) into which the light is cut off as it passes through a tapered area and radiated according to the radiation angle (θ1) to a final target area.

[0074] The tapered angle (θ2) of the radiating section (106) can be designed in various ways depending on how the radiation area is set, and the length of the light transmission section (104) can also be arbitrarily designed to the length to be transmitted through internal total reflection without loss of light.

[0075] Meanwhile, light generated from the light source (100) is incident on the input (101) of the tapered light guide (102), and the light incident on the input (101) is transmitted to the radiation (106) through the light transmission unit (104) by internal total reflection.

[0076] The tapered light guide (102) is formed of a material having a refractive index higher than that of air, and in the light transmission section (104) region, the angle of incidence of light to escape into the air outside the tapered light guide (102) is greater than the critical angle (θc) determined by the tapered light guide (102) and the refractive index of air, so the light incident on the input section (101) is prevented from escaping outside the light transmission section (104) by internal total reflection.

[0077] However, from the point (C) where the radiating part (106) of the tapered light guide (102) starts to the end (107), the angle of incidence of light to escape into the air outside the tapered light guide (102) is less than or equal to the critical angle (θc) determined by the refractive index of the tapered light guide (102) and the air, so the internal total reflection condition is not satisfied, and the light transmitted to the radiating part (106) through the light transmission part (104) is radiated outside the radiating part (106) over the radiation angle (θ1).

[0078] For reference, if the refractive index of air is n1 and the refractive index of the tapered light guide (102) is n2, the critical angle (θc) is calculated by Equation 1.

[0079]

[0080] The tapered angle (θ2) of the above tapered light guide (102) refers to the angle (θ2) formed by the two ends (108, 109) of the input section (101) and the end (107) of the radiation section (106).

[0081] As illustrated in FIGS. 2(a) to 2(c), the radiation angle (θ1), which is the angle at which the light spreads, is larger as the tapered angle (θ2) of the tapered light guide (202) increases, and is smaller as the tapered angle (θ2) decreases. Additionally, the length of the tapered light guide (202) is shorter as the tapered angle (θ2) increases, and longer as the tapered angle (θ2) decreases.

[0082] Figures 3(a) to 3(e) illustrate the results of a LightTools simulation.

[0083] FIG. 3(a) is a diagram illustrating light spreading from a tapered light guide (102, 202), and FIG. 3(b) is a diagram showing the intensities of light spreading from a tapered light guide (102, 202).

[0084] Additionally, FIGS. 3(c) to 3(e) illustrate the degree of light spreading according to the length of the tapered light guide (102, 202). In FIGS. 3(c) to 3(e), Radius represents the diameter of the input portion (101) of the tapered light guide (102, 202), Length represents the total length of the tapered light guide (102, 202), and Taper represents the diameter of the end portion (107) of the tapered light guide (102, 202).

[0085] In FIGS. 3(c) to 3(e), the tapered angle (θ2) of the tapered light guide (102, 202) is changed by changing only the total length of the tapered light guide (102, 202) without changing the diameter of the input portion (101) of the tapered light guide (102, 202) and the diameter of the end portion (107) of the tapered light guide (102, 202).

[0086] As moving from Fig. 3(c) to Fig. 3(e), the tapered angle (θ2) of the tapered light guide (102, 202) increases, and accordingly, the radiation angle (θ1), which is the angle at which the light spreads, increases.

[0087] Meanwhile, in a light irradiation device using a tapered light guide according to the first embodiment of the present invention, the tapered light guide (102, 202) is formed in a cone shape, but the present invention is not limited thereto, and the tapered light guide can be formed as one of an elliptical cone and an n-sided pyramid, where n is an integer greater than or equal to 3.

[0088] In addition, in the light irradiation device using a tapered light guide according to the first embodiment of the present invention, the tapered light guide (102, 202) is formed in a cone shape, but the present invention is not limited thereto, and as shown in FIG. 7, the tapered light guide (700) may be formed as a cone or an n-sided pyramid (704) placed on top of a column (702) which is one of a cylinder, an elliptical cylinder, and an n-sided column, and the column (702) and the cone or n-sided pyramid (704) may be directly connected or connected in two or more stages as shown in FIG. 7 (not shown), and n is an integer greater than or equal to 3.

[0089] Additionally, the end (107) of the radiating portion (106) of the tapered ride guide (102), which is the part where light is emitted, may be in the form of a single point as shown in FIG. 1, but the present invention is not limited thereto, and the end of the radiating portion, which is the part where light is emitted of the tapered ride guide, may be formed as one of a sphere, an ellipsoid, or a polygon.

[0090] Additionally, the end of the tapered light guide may simply form a cut surface, and as shown in FIG. 8, a scattering portion (804) formed of a scattering material or scattering film for scattering light may be further included at the end (802) of the light-emitting portion of the tapered light guide (800).

[0091] Additionally, as illustrated in FIG. 9, a light irradiation device using a tapered light guide may further include an optical system (904) including a lens for directing light generated from a light source (900) into a tapered light guide (902).

[0092] FIG. 4 is a drawing illustrating a light irradiation device using a tapered light guide according to a second embodiment of the present invention, in which the light irradiation device is formed with a tapered light guide array.

[0093] A light irradiation device using a tapered light guide according to the second embodiment of the present invention illustrated in FIG. 4 includes first to eighth light source units (400_1 to 400_8) and first to eighth tapered light guides (402_1 to 402_8) that transmit light generated from the first to eighth light source units (400_1 to 400_8) to a certain length and radiate the transmitted light to spread at a predetermined angle.

[0094] A light irradiation device using a tapered light guide according to the second embodiment of the present invention illustrated in FIG. 4 includes eight light source units and a tapered ride guide, but the present invention is not limited thereto and may include fewer or more light source units and tapered ride guides.

[0095] A light irradiation device using a tapered light guide according to the second embodiment of the present invention illustrated in FIG. 4 is equipped with a tapered light guide array comprising eight tapered light guides, so that light energy can be evenly transmitted to the scalp through the hair.

[0096] Meanwhile, FIG. 5 is a drawing illustrating a light irradiation device using a tapered light guide according to a third embodiment of the present invention, in which tapered light guides of various lengths are arranged according to the length of the hair.

[0097] As shown in FIG. 5, a plurality of tapered light guides (506, 508, 510) are formed into a first tapered light guide group (500), a second tapered light guide group (502), and a third tapered light guide group (504).

[0098] Tapered light guides belonging to the same tapered light guide group have the same tapered angle, and the tapered angle and the length of the tapered light guide between the tapered light guide groups (500, 502, 504) are different from each other.

[0099] Accordingly, by using a light irradiation device utilizing a tapered light guide according to the third embodiment of the present invention illustrated in FIG. 5, various combinations of tapered light guides can be arranged according to the length of the hair to efficiently irradiate light onto the scalp.

[0100] FIG. 6 is a drawing illustrating a light irradiation device using a tapered light guide according to a fourth embodiment of the present invention.

[0101] A light irradiation device using a tapered light guide according to the fourth embodiment of the present invention illustrated in FIG. 6 includes a plurality of light source units (600, 604, 608) and a plurality of tapered light guides (602, 606, 610) that transmit light generated from the plurality of light source units (600, 604, 608) to a certain length and radiate the light transmitted to the certain length to spread out at a predetermined angle.

[0102] In addition, a light irradiation device using a tapered light guide according to the fourth embodiment of the present invention further includes a support member (620) that supports the plurality of light source members (600, 604, 608) and the plurality of tapered light guides (602, 606, 610), first to third light source member drivers (612, 614, 616) for controlling the operation of the plurality of light source members (600, 604, 608), and a control member for controlling the operation of the first to third light source member drivers (612, 614, 616).

[0103] The plurality of light source units (600, 604, 608) are formed into first to third light source groups (600, 604, 608), and the plurality of tapered light guides (602, 606, 610) are formed into first to third tapered light guide groups (602, 606, 610).

[0104] In a light irradiation device using a tapered light guide according to the fourth embodiment of the present invention, each tapered light guide belonging to the same tapered light guide group has the same tapered angle, and the tapered angles between the tapered light guide groups are different from each other.

[0105] That is, each tapered light guide belonging to the first tapered light guide group (602) has the same tapered angle, each tapered light guide belonging to the second tapered light guide group (606) has the same tapered angle, and each tapered light guide belonging to the third tapered light guide group (610) has the same tapered angle.

[0106] Meanwhile, the control unit (618) can control the operation of the first to third light source drivers (612, 614, 616) so that light of different intensities is generated from each of the plurality of light source groups (600, 604, 608).

[0107] In addition, the first to third light source groups (600, 604, 608) can each emit light of different wavelengths.

[0108] Although the present invention has been described in detail through specific embodiments, this is for the purpose of specifically explaining the invention and is not limited thereto. It will be apparent that modifications or improvements can be made by those skilled in the art within the technical scope of the present invention.

[0109] All simple variations or modifications of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be clarified by the appended claims. Explanation of the symbols

[0110] 100, 600, 604, 608 : Light source section 101 : Input section 102, 700, 800, 902: Tapered Light Guide 104: Light transmission section 106: Radiation section 107, 802 : Terminal 110 : Light source driver 112, 618 : Control unit 400_1 to 400_8: 1st to 8th light source units 402_1 to 402_8: 1st to 8th tapered light guides 500: 1st Tapered Light Guide Group 502: 2nd Tapered Light Guide Group 504: 3rd Tapered Light Guide Group 612: 1st light source driver 614: 2nd light source driver 616 : 3rd light source driver 620 : Support part 702 : Column 704 : Cone or n-sided pyramid 804 : Spawning part 900 : Light source 904 : Optical system

Claims

Claim 1 A light irradiation device using a tapered light guide, comprising: a light source unit; and a tapered light guide that transmits light generated from the light source unit to a certain length and radiates the transmitted light to spread at a predetermined angle, wherein the tapered light guide comprises: a light transmission unit for transmitting light generated from the light source unit to a certain length through internal total reflection; and a radiation unit for irradiating the transmitted light to a scalp to spread at a predetermined angle, wherein the tapered light guide comprises an incident unit into which light generated from the light source unit is incident, wherein the light transmission unit of the tapered light guide is a part into which light incident through the incident unit is transmitted to a certain length through internal total reflection, and the radiation unit of the tapered light guide is a part into which light transmitted to a certain length through the light transmission unit is radiated because it does not satisfy the internal total reflection condition. Claim 2 delete Claim 3 delete Claim 4 A light irradiation device using a tapered light guide according to claim 1, wherein the angle at which the light spreads is larger as the tapered angle of the tapered light guide is larger and smaller as the tapered angle is smaller, and the length of the tapered light guide is shorter as the tapered angle is larger and longer as the tapered angle is smaller. Claim 5 A light irradiation device using a tapered light guide according to claim 1, wherein the tapered light guide is formed as one of a cone, an elliptical cone, and an n-sided pyramid, and n is an integer greater than or equal to 3. Claim 6 A light irradiation device using a tapered light guide according to claim 1, wherein the tapered light guide is formed as a cone or an n-sided pyramid placed on top of a column selected from a cylinder, an elliptical cylinder, and an n-sided column, and the column and the cone or n-sided pyramid are directly connected or connected in two or more stages, and n is an integer greater than or equal to 3. Claim 7 A light irradiation device using a tapered light guide according to claim 1, wherein the end of the light-emitting portion of the tapered light guide is formed as one of a 1-point shape, a sphere, an ellipsoid, or a polygon. Claim 8 A light irradiation device using a tapered light guide according to claim 1, further comprising a scattering portion formed of a scattering material for scattering light at the end of the portion of the tapered light guide where light is emitted. Claim 9 A light irradiation device using a tapered light guide according to claim 1, wherein the light source comprises at least one of a laser diode, a VCSEL (Vertical Cavity Surface Emitting Laser), and a light-emitting diode. Claim 10 A light irradiation device using a tapered light guide according to claim 1, further comprising a support member for supporting the light source member and the tapered light guide. Claim 11 A light irradiation device using a tapered light guide according to claim 1, further comprising: a light source driver for controlling the operation of the light source unit; and a control unit for controlling the operation of the light source driver. Claim 12 A light irradiation device using a tapered light guide according to claim 1, wherein the light source unit comprises: a light source that generates light; and an optical system for causing light generated from the light source to be incident on the tapered light guide. Claim 13 A light irradiation device using tapered light guides, comprising: a plurality of light source units; and a plurality of tapered light guides that transmit light generated from the plurality of light source units to a certain length and radiate the transmitted light to spread at a predetermined angle, wherein each of the plurality of tapered light guides includes: a light transmission unit for transmitting light generated from the light source units to a certain length through internal total reflection; and a radiation unit for irradiating the transmitted light to a scalp to spread at a predetermined angle, wherein the tapered light guide includes an incident unit into which light generated from the light source units is incident, wherein the light transmission unit of the tapered light guide is a part into which light incident through the incident unit is transmitted to a certain length through internal total reflection, and the radiation unit of the tapered light guide is a part into which light transmitted to a certain length through the light transmission unit is radiated because it does not satisfy the internal total reflection condition. Claim 14 delete Claim 15 delete Claim 16 A light irradiation device using a tapered light guide according to claim 13, wherein the angle at which the light spreads is larger as the tapered angle of the tapered light guide is larger and smaller as the tapered angle is smaller, and the length of the tapered light guide is shorter as the tapered angle is larger and longer as the tapered angle is smaller. Claim 17 A light irradiation device using a tapered light guide according to claim 13, further comprising: a support member supporting the plurality of light source members and the plurality of tapered light guides; a light source member driver for controlling the operation of the plurality of light source members; and a control member for controlling the operation of the plurality of light source member drivers. Claim 18 A light irradiation device using tapered light guides according to claim 17, wherein the plurality of light source units are formed into a plurality of light source groups, the plurality of tapered light guides are formed into a plurality of tapered light guide groups, each tapered light guide belonging to the same tapered light guide group has the same tapered angle, and the tapered angles between the tapered light guide groups are different from each other. Claim 19 A light irradiation device using a tapered light guide according to claim 18, wherein the control unit controls the operation of the plurality of light source drivers so that light of different intensities is generated from the plurality of light source groups. Claim 20 A light irradiation device using a tapered light guide, wherein the plurality of light source groups emit light of different wavelengths.

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