Non-direct light therapy device

Abstract

The present invention belongs to the field of medical devices, and specifically discloses a non-direct light therapy device. The device is composed of a cavity, a reflective light emitter, an electrode, and a control circuit. The cavity includes a cover plate and a bottom plate. The reflective light emitter is an integrated device composed of a light-emitting diode, a support member, and a folded optical path element. The support member holds up the LED chip, making the position of the LED higher than the midpoint of the thickness line of the cover plate-bottom plate and restricting the initial light beam of the LED to point to the bottom plate, so that the initial light beam does not form a geometric optical path that directly irradiates the skin. An array is composed of M reflective light emitters, generating at least M virtual image light sources (M>3). In the cavity, the sub-beams corresponding to the virtual images are reflected and diffusely reflected along multiple paths; at the output surface, multiple sub-beams are non-coherently superimposed, resulting in an increase in the uniformity of the synthesized light spot and a decrease in the light power density projected onto the skin. By adopting a folded optical path and irradiating the human body in a non-direct way, the photobiological safety of ultraviolet light therapy is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and in particular to a non-direct light therapy device. Background Art

[0002] Vitamin D deficiency can cause decreased bone density, osteoporosis and other metabolic bone diseases, leading to an increased risk of fractures in the elderly. Low vitamin D levels in the body are closely related to autoimmune diseases (as well as hypertension, tumors, diabetes, cardiovascular and cerebrovascular diseases, etc.).

[0003] Humans supplement vitamin D in three ways: sunlight, food, and vitamin D supplements. The effects of these three methods are significantly different:

[0004] The ultraviolet component in sunlight has the function of inducing photochemical reactions and synthesizing vitamin D. About 80% of human vitamin D is synthesized in the epidermis.

[0005] The results of the study suggest that endogenous vitamin D obtained from sunlight remains active in the body longer than exogenous vitamin D obtained from diet and vitamin D supplements.

[0006] Compared with the ultraviolet component of sunlight, the ultraviolet light produced by light emitting diodes (LED) is more efficient and effective in producing vitamin D3 when irradiating the skin. The ultraviolet power density is no more than 10 microwatts per square centimeter, and the phototherapy process is safe for the human body.

[0007] Based on the above medical research results, a variety of ultraviolet therapy devices have been successfully trial-produced at home and abroad, used in animal and human trials, and achieved obvious therapeutic effects.

[0008] At present, the following technical problems need to be solved in the field of phototherapy:

[0009] Commercially available phototherapy devices use direct irradiation technology, that is, the output light of the LED light source is directly transmitted to the skin. Among them, the light-emitting diode has the properties of a point light source. The size of the commonly used LED lamp beads is about 200 microns. When close to the skin, the light power density generated by a single lamp bead is as high as 10 3 Watts / square centimeter, which is much larger than the medical safety value of 10 microwatts / square centimeter.

[0010] At present, manufacturers of phototherapy devices have adopted the method of increasing the thickness of the device to keep the LED lamp beads away from the skin, thereby reducing the light power density of the point light source projected onto the skin. The adverse consequence of the increase in the thickness of the commercially available device is that the volume (and weight) of the whole device increases accordingly, making the user feel heavier when wearing it. Summary of the invention

[0011] In view of the deficiencies in the above-mentioned background art, the present invention provides a new optical path configuration, and the technical problem to be solved is: to increase the distance between the LED and the human body while reducing the thickness of the device.

[0012] Specifically, the present invention discloses a non-direct light therapy device, which uses a reflective light emitter to reduce the thickness of the device. At the same time, a folded optical path is adopted to convert the light beam emitted by the LED solid light source into an equivalent light beam of a virtual image light source, so as to increase the irradiation distance from the LED ultraviolet point light source to the human body.

[0013] The technical content of the present invention:

[0014] The non-direct light therapy device includes a cavity, a reflective light emitter, an embedded electrode and a control circuit; wherein, the cavity includes a cover plate, a bottom plate and a frame; the skin is located outside the cover plate;

[0015] The reflective light emitter is an integrated device composed of a light-emitting diode, a support member and a folded optical path element; wherein, the support member is a component made of a hard material with a reflective surface; the folded optical path element includes a main reflector, and / or an auxiliary reflector, and / or the reflective surface of the support member; the cover plate can reflect part of the light rays and transmit part of the light rays.

[0016] The bottom plate is located on the XOY plane of the rectangular coordinate system, and the OZ axis points to the skin; the mirror body of the main reflector is closely attached to the XOY plane of the rectangular coordinate system; the end of the main reflector is connected to the lower end of the support member to form a first type of folded optical path; or the other end of the main reflector is connected to the lower end of the auxiliary reflector to form a second type of folded optical path;

[0017] One of the structural features of the present invention is that the LED chip is not directly installed on the bottom plate of the light therapy device, but is placed between the cover plate and the bottom plate. That is to say, the inner side surface of the upper end of the support member is encapsulated with the bottom surface of the LED chip; the support member holds the LED chip, so that the chip is located above the XOY plane, and the light-emitting point of the light-emitting diode is higher than the midpoint of the thickness line between the cover plate and the bottom plate

[0018] Another structural feature of the present invention is that the initial light beam of the light-emitting diode does not form a geometric optical path that directly irradiates the skin. That is to say, the initial light beam emitted by the light-emitting diode first irradiates the folded optical path element, and then irradiates the skin in a non-direct way.

[0019] Use the direction vector OL to represent the central axis of the initial light beam of the light-emitting diode, and limit the value of the included angle to be 155°≥∠ZOL>90°, or 180°≥∠ZOL>155°; that is, limit the initial light beam to point below the XOY plane.

[0020] Another structural feature of the present invention is to use a folded optical path to transform the LED solid light source into a virtual image light source:

[0021] The reflective surface of the folding optical path element, the inner surface of the cover plate, and the reflective surface of the bottom plate form a folded optical path inside the cavity; the lamp beads in the chip of the light-emitting diode irradiate the main reflector, the auxiliary reflector, or the reflective surface of the bottom plate, forming at least one virtual image, and the virtual image is located at the mirror-symmetric position below the XOY plane;

[0022] The folded propagation path of the initial light beam of the light-emitting diode is any one of the following three paths. One is: the lamp bead in the chip → the main reflector → the inner reflective surface of the cover plate → the reflective surface of the bottom plate → other reflective and diffuse reflective surfaces in the cavity;

[0023] Or, the folded propagation path is: the lamp bead in the chip → the main reflector → the inner reflective surface of the cover plate → the reflective surface of the adjacent support → multi-path reflection and diffuse reflection in the cavity;

[0024] Or, the folded propagation path is: the lamp bead in the LED chip → the reflective surface of the bottom plate → the inner reflective surface of the cover plate → other reflective and diffuse reflective surfaces in the cavity;

[0025] In the folded optical path, the light beam emitted by a single LED solid light source is transformed into a light beam emitted by a virtual image light source and irradiates the skin in a non-direct way;

[0026] M reflective light-emitting bodies form an array, generating at least M virtual image light sources (M > 3). The sub-beams corresponding to the virtual image light sources are reflected and diffusely reflected along multiple paths in the cavity, and a composite light spot is formed on the skin surface in a non-coherent superposition manner of multiple sub-beams.

[0027] The base of the LED chip is light-impermeable and blocks light, resulting in a shadow area in the output light spot. In the present invention, a reflective surface is provided on the outside of the support to weaken such shadows: in the cavity, when a part of the light reaches the base of the LED chip, the reflective surface on the outside of the support deflects this light to the shadow area.

[0028] According to the same inventive concept, the shape of the light therapy device of the present invention is a flat box or a flexible film.

[0029] The bottom plate is made of an ultraviolet reflective material. For example, aluminum and polytetrafluoroethylene (reflective type).

[0030] The cavity cover plate is made of a material with an ultraviolet reflection coefficient greater than the transmission coefficient, including a fluoropolymer material with an adjustable ultraviolet transmission / reflection beam splitting ratio; for example: polydimethylsiloxane (abbreviation PDMS), polytetrafluoroethylene (transmission type);

[0031] Other fluorine-containing polymers include: polyethylene (PE) film: in the range of (200 - 300) nm, the transmittance of a 30-μm PE film is generally lower than 20%, except at 274, 208, 232, and 292 nm, where the peaks at 274 and 292 nm are 70% and 100% respectively.

[0032] Ethylene tetrafluoroethylene (EFEP), fluorinated ethylene propylene (FEP), perfluoroalkoxy (PFA), tetrafluoroethylene - hexafluoropropylene vinylidene fluoride (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ethylene tetrafluoroethylene (ETFE), etc.

[0033] The folded optical path consists of at least three types of reflective surfaces, including: each reflective surface of the folded optical path element, the inner surface of the cover plate, and the reflective surface of the bottom plate;

[0034] The LED beads in the chip are solid light sources; the functions of the main reflector, auxiliary reflector, and the reflective surface of the bottom plate in the folded optical path are to transform the light beam emitted by the LED solid light source into an equivalent virtual image light beam; the virtual image light beam irradiates the skin in a non-direct way;

[0035] The initial light beam of the light-emitting diode is reflected at least once before it irradiates the skin. The folded optical path makes the light-emitting body generate at least one virtual image light source, which is equivalent to irradiating the skin with the virtual image light source, so as to expand the effective irradiation area of the initial light beam and reduce the light power density projected into the body.

[0036] According to the same inventive concept, the structure of the reflective light-emitting body of the present invention is any one of three configurations, namely, a side-mounted V-shaped structure, an L-shaped structure, or an inverted Π-shaped structure.

[0037] The reflective light-emitting body has the first configuration - a side-mounted V-shaped structure: the support is a rectangular plate-shaped or strip-shaped component, and the lower end of the plate-shaped component is connected to the left end of the main reflector; the clockwise included angle between the plate-shaped component of the support and the main reflector body takes a value of

[0038] 25° ≤ ∠α < 90°, and the device shape is a side-mounted V shape. This integrated packaging device is called a V-shaped reflective light-emitting body;

[0039] The main reflector is placed on the bottom plate; the light-emitting diode is located inside the upper end of the left support, and the emitted initial light beam irradiates the surface of the main reflector, so that a part of the light rays of the LED solid light source S0 forms a first type of virtual image S1 at the mirror-symmetrical position on the lower side of the bottom plate.

[0040] Alternatively, the reflective light emitter has a second configuration - an L-shaped structure: the support is a rectangular plate-shaped or strip-shaped component, and the lower end of the plate-shaped component is connected to the right end of the main reflector; the counterclockwise included angle between the plate-shaped component of the support and the main reflector body ranges from

[0041] 90° < ∠β ≤ 155°, the device has an L-shaped appearance, and this integrated package device is called an L-shaped reflective light emitter;

[0042] The main reflector is placed on the bottom plate; the light-emitting diode is located outside the upper end of the right support, and the initial light beam emitted irradiates the reflective surface of the bottom plate in the lower right, so that a part of the light of the LED solid light source S0 forms a second type of virtual image S2 at the mirror-symmetrical position on the lower side of the bottom plate.

[0043] Alternatively, the reflective light emitter has a third configuration - an inverted Π-shaped structure: the support is a rectangular plate-shaped or strip-shaped component, and the lower end of the plate-shaped component is connected to the left end of the main reflector; the clockwise included angle between the plate-shaped component of the support and the main reflector body ranges from

[0044] 25° < ∠α ≤ 90°;

[0045] The auxiliary reflector is a rectangular plate-shaped component, and the lower end of the plate-shaped component is connected to the right end of the main reflector; the counterclockwise included angle between the plate-shaped component of the auxiliary reflector and the main reflector body ranges from

[0046] ∠β ≌ (180° - α);

[0047] The device has an inverted Π-shaped appearance, and the integrated package device is called a Π-shaped reflective light emitter. In the same inverted Π-shaped reflective light emitter, a single LED solid light source S0 located above the XOY plane can parallelly generate two virtual images located below the XOY plane, which are called the third type of virtual images; the sub-beams corresponding to the two virtual image light sources generate two second-order light spots, and the two second-order light spots are combined into a synthetic light spot (S a +S b ) with a uniform light intensity distribution.

[0048] According to the same inventive concept, the side-mounted V-shaped structure has the following two derivative configurations:

[0049] The plate-shaped support defined above is split into two separate components:

[0050] One of the separate components is a small-area reflector, and its geometric area is approximately equal to the area of the LED chip substrate. The small-area reflector and the LED substrate are packaged together to form a new type of LED chip with a reflective surface on the back of the chip.

[0051] The second separating component is a thin strip-shaped Λ-shaped bracket. The bracket is a thin strip-shaped metal or plastic part.

[0052] Derivative configuration I: With the main mirror as the carrier, the Λ-shaped bracket stands on the carrier and holds the new type of LED chip above the midpoint of the cover plate-bottom plate thickness line. This integrated packaging device is called a Λ-shaped (main mirror type) reflective illuminator.

[0053] Derivative configuration II: With the bottom plate of the phototherapy device as the carrier, the Λ-shaped bracket stands on the bottom plate and holds the new type of LED chip described above above the midpoint of the cover plate-bottom plate thickness line. This integrated packaging device is called a Λ-shaped (bottom plate reflection type) reflective illuminator.

[0054] Furthermore, the present invention provides a structural manner in which two or more reflective illuminators are connected in series. Specifically, the light propagation mode of two L-shaped reflective illuminators connected in series is as follows: 1 / 2 of the sub-beams of the initial light beam emitted by the light-emitting diodes of the first L-shaped reflective illuminator irradiate the main mirror of the adjacent second L-shaped reflective illuminator, and under the condition of ignoring the diffraction effect, a semi-circular first-order light spot is formed; at the same time, the other 1 / 2 of the sub-beams of the initial light beam emitted by the first L-shaped reflective illuminator irradiate the reflective surface of the support member of the adjacent second L-shaped reflective illuminator, and under the condition of ignoring the diffraction effect, another semi-circular first-order light spot is formed;

[0055] The two sub-beams corresponding to the above two first-order light spots reach the output surface of the reflective illuminator along the folded optical path and generate a combined light spot with a redistributed optical power in a non-coherent superposition manner.

[0056] Furthermore, the present invention provides a geometric shape design scheme for the folded optical path element, so that a single light-emitting diode can generate more than two virtual images at the same time.

[0057] Technical measures for generating multiple virtual image light sources with a single solid light source include: a part of the reflective surface inside the reflective illuminator is a single-plane structure, and another part of the reflective surface is a petal-shaped structure composed of n partitions, where n is an integer and 8 ≥ n ≥ 2;

[0058] Using the direction vector OL to represent the central axis of the initial light beam of the light-emitting diode, under the condition that the included angle between the OL axis and the OZ axis is restricted to 180° ≥ ∠ZOL > 155°; the light-emitting diode irradiates the petal-shaped configuration, and the n petal-shaped reflective surfaces cause a single LED solid light source S0 to generate n virtual image light sources.

[0059] Furthermore, part of the support reflective surface or the main reflector is divided into n equal parts, where n is an integer, and the optical reflective surface has a V-shape, or a triangular pyramid, or a tetrahedron geometry, so that a single LED physical light source S0 forms n virtual image light sources at one time.

[0060] The present invention provides a new configuration of a light emitting diode power supply electrode component - LED embedded electrode.

[0061] A pad is arranged on the bottom plate, and the pad is located on the XOY plane;

[0062] The inner side surface of the upper end of the support member is packaged into one with the LED chip base; the lifting effect of the plate-shaped or strip-shaped support member makes the electrode bracket in the LED chip located on the upper side of the XOY surface and higher than the midpoint of the thickness line between the cover plate and the bottom plate;

[0063] The conductive wire is embedded in the non-mirror part of the support member and the main reflector; the external electrode of the light emitting device is embedded in the bottom of the main reflector;

[0064] The connection method of the LED power supply circuit is: base plate pad → light-emitting device external electrode conductive wire → chip internal electrode bracket → electrode connecting part → chip internal lamp bead.

[0065] Further, the control circuit is installed on the frame of the phototherapy device;

[0066] The control circuit system includes a light radiation dose control module, a photobiological safety management module, a communication module and a storage module;

[0067] The light radiation dose control module includes: a circuit for quasi-real-time detection of the light intensity in the cavity, a delayed start-up and a time-limited shutdown circuit; the light radiation dose is equal to the product of the radiation source intensity of the device and the radiation exposure time T; the device generates narrow-band UVB radiation with a wavelength of 298±20nm, and each exposure time T≥2 minutes; the effective area of ​​the device is 2% to 20% of the human skin area.

[0068] The photobiological safety management module includes: a flexible tactile sensor, a micro switch, and a voice recognizer; the flexible tactile sensor and the micro switch are used to determine whether the phototherapy device is in close contact with the skin; the voice recognizer uses a specific person voice recognition chip to determine whether the user has received training on safe operating procedures;

[0069] The photobiological safety management module can determine whether the operation monitoring signal is normal, prevent illegal operation events, and issue safety warnings when necessary;

[0070] The communication module receives remote control commands issued from the outside or uploads data by wireless communication, and the data includes LED chip luminous state parameters and photoelectric monitoring signals;

[0071] The storage module stores the power-on and running time and the optoelectronic operation parameters of the entire phototherapy process.

[0072] Beneficial effects produced:

[0073] The present invention thins the thickness of the phototherapy device and improves the safety and comfort of ultraviolet LED irradiating the human body from the aspects of the upstream LED chip packaging process and configuration;

[0074] (1) The LED solid light source irradiates the human body in a non-direct way, reducing the potential risk of ultraviolet radiation harming health:

[0075] The reflective light emitter transforms the LED solid light source into one or more virtual image light sources. The virtual image light source expands the effective irradiation area of the reflected light beam, thereby reducing the spot power density projected onto the human body and keeping it at the level of 10 microwatts per square centimeter, improving the photobiological safety of the ultraviolet light device.

[0076] (2) The folded optical path element reduces the thickness of the phototherapy device:

[0077] The initial beam of the light-emitting diode of this device points in the direction of the bottom plate, and only after at least one reflection can part of the energy of the initial beam reach the skin.

[0078] The folded optical path of the present invention brings the dual benefits of increasing the optical path of the light propagating in the cavity and reducing the thickness of the device.

[0079] In the subsequent detailed implementation part, other beneficial effects of the present invention will be described in detail. Description of the Drawings

[0080] Figure 1 , schematic diagram of installing a reflective light emitter in the phototherapy device (Embodiment 1):

[0081] (a) Installing a side-mounted V-shaped reflective light emitter in a flat box cavity;

[0082] (b) Installing a side-mounted V-shaped reflective light emitter in a flexible film cavity;

[0083] (c) Installing an L-shaped reflective light emitter in a flat box cavity;

[0084] Figure 2 , comparing the structural features of non-direct and direct phototherapy devices (Embodiment 2):

[0085] (a) In the non-direct phototherapy device, the initial LED beam points to the bottom plate, and the light propagates along a broken line and indirectly irradiates the skin;

[0086] (b) In the direct light therapy device, the initial light beam of the LED points to the cover plate, and the light travels along a straight path and directly irradiates the skin;

[0087] Figure 3 , in the non-direct light therapy device, schematic structural diagram of the LED chip (Example 3):

[0088] (a) Three-dimensional view of the outer shape of the LED chip, (b) top view of the LED chip, (c) schematic cross-sectional view of the LED chip;

[0089] Figure 4 , integrated component formed by encapsulating the support plate with a reflective surface and the LED chip (Example 3):

[0090] (a) Three-dimensional view of the integrated structure formed by encapsulating the base of the LED chip and the support plate;

[0091] (b) A-A cross-sectional view of the electrodes and conductive wires embedded in the support plate;

[0092] Figure 5 , three basic configurations of the reflective light emitter (Example 4):

[0093] (a) Side-mounted V-shaped reflective light emitter [90° < α ≤ 155°], (b) L-shaped reflective light emitter

[0094] [β ≌ 180° - α]; (c) inverted Π-shaped reflective light emitter;

[0095] Figure 6 , schematic structural diagram of the side-mounted V-shaped reflective light emitter (Example 5):

[0096] (a) Geometric relationship between the light emission axis OL of the light-emitting diode and the OZ axis of the light therapy device coordinate system,

[0097] angle 155° > Φ > 90°, (b) structure of the V-shaped reflective light emitter

[0098] [25° ≤ α < 90°], (c) first-order light spot inside the V-shaped reflective light emitter;

[0099] Figure 7 , for the V-shaped reflective light emitter, the virtual images S1 and S2 generated by the LED solid light source S0 are located on the lower side of the bottom plate of the flat box device (Example 5);

[0100] Figure 8 , schematic diagram of partial light propagation between two V-shaped reflective light emitters installed in the flat box device.

[0101] In the figure, the reflective surface 2 of the support plate deflects the direction of the light in the cavity, thereby reducing the shadow in the emitted light spot (Example 6);

[0102] Figure 9 , Schematic diagram of the structure of the L-shaped reflective light emitter (Example 7):

[0103] (a) Structure of the L-shaped reflective light emitter [155° ≥ β > 90°], (b) First-order light spot formed by the L-shaped reflective light emitter on the bottom plate of the light therapy device;

[0104] Figure 10 , Schematic diagram of the L-shaped reflective light emitter, where the light beam irradiates the bottom plate and produces virtual images (Example 7):

[0105] (a) Schematic diagram of the LED in the L-shaped reflective light emitter, generating a first-order light spot on the bottom plate;

[0106] (b) L-shaped reflective light emitter, virtual images S1 and S2 generated by the LED solid light source S0 are located on the lower side of the bottom plate of the flat box device;

[0107] Figure 11 , Schematic diagram of the common characteristics of virtual images generated by V-shaped and L-shaped reflective light emitters (Example 8):

[0108] (a1) Structure of the V-shaped reflective light emitter [90° ≥ α > 25°], (a2) Schematic diagram of the optical path for the LED light beam to irradiate the main reflector and generate the virtual image S1;

[0109] (b1) Structure of the L-shaped reflective light emitter [155° ≥ β > 90°], (b2) Schematic diagram of the optical path for the LED light beam to irradiate the bottom plate and generate the virtual image S1;

[0110] Figure 12 , Characteristics of the optical power distribution of the output light spot of the virtual image light source (Example 9):

[0111] (a) Ray transmission model for numerical simulation ---- Schematic diagram of the optical path for forming virtual images S1 and S2,

[0112] (b) Schematic diagram of the device structure model for numerical simulation;

[0113] (c1) Output light spot of a single light emitter (without a support plate reflector), (c2) Output light spot of a single light emitter (with a support plate reflector, numerical simulation);

[0114] (d1) Optical power distribution after the superposition of double light spots generated by two light emitters (numerical simulation conditions d = 22 mm, without a support plate reflector), (d2) Optical power distribution after the superposition of double light spots (with a support plate reflector);

[0115] (e1) Optical power distribution after the superposition of double light spots generated by two light-emitting bodies (numerical simulation condition: d = 12 mm, without the reflecting surface of the support plate), (e2) Optical power distribution after the superposition of double light spots (with the reflecting surface of the support plate);

[0116] (f1) Output light spot of a 4×4 array of reflective light-emitting bodies (numerical simulation condition: d = 25 mm, with the reflecting surface of the support plate), (f2) Output light spot of a 4×4 array of reflective light-emitting bodies (numerical simulation condition: d = 25 mm, with the reflecting surface of the support plate);

[0117] Figure 13 , Schematic diagram of an inverted Π-shaped reflective light-emitting body (Example 10):

[0118] (a) Structure diagram of a V-shaped No. 1 light-emitting body, (b) Structure diagram of an L-shaped No. 2 light-emitting body, (c) Structure diagram of an inverted Π-shaped reflective light-emitting body, (d) Side view of an inverted Π-shaped reflective light-emitting body; (e) Schematic diagram of installing 3 inverted Π-shaped reflective light-emitting bodies in a flat box-type phototherapy device;

[0119] Figure 14 , Schematic diagram of the series connection arrangement of 2 to 3 V-shaped reflective light-emitting bodies (Example 11):

[0120] (a) Three-dimensional schematic diagram of the series connection of two light-emitting bodies, (b) Schematic diagram of a No. 1 light-emitting body generating two semi-circular light spots, (c) Side view of the series connection arrangement of three light-emitting bodies;

[0121] Figure 15 , Schematic diagram of the series connection arrangement of 3 or more L-shaped reflective light-emitting bodies (Example 12):

[0122] (a) Three-dimensional schematic diagram of the series connection of three light-emitting bodies, (b) Side view of the series connection of three light-emitting bodies, (c1) Installation of three groups of light-emitting bodies (each group of 2 in series) in a flat box-type phototherapy device, (c2) The light-emitting bodies form a 3*5 array;

[0123] Figure 16 , Schematic diagram of the series connection arrangement of two L-shaped reflective light-emitting bodies to generate two virtual image light sources (Example 13):

[0124] (a) Three-dimensional structure diagram of a single LED solid light source irradiating two reflecting surfaces, (b) A single LED solid light source S0 irradiates the main reflector (3) to generate a virtual image light source S1, (c) A single LED solid light source S0 irradiates the reflecting surface of the right support plate (2) to generate a virtual image light source S2, (d) Schematic diagram of the superposition of two semi-circular sub-light spots (second-order light spots) corresponding to the virtual image light sources S1 and S2 on the P plane to form a composite light spot, (e) Schematic diagram of the different orientations of the two semi-circular sub-light spots (second-order light spots) corresponding to the virtual image light sources S1 and S2 on the P plane;

[0125] Figure 17 , two L-shaped reflective light emitters are connected in series, and two semi-circular sub-spots are superimposed to form a combined spot ( Figure 16 , second-order spot), a schematic diagram of the semi-circular orientations of the two sub-spots being different (Example 14);

[0126] Figure 18 , two L-shaped reflective light emitters are connected in series, and two semi-circular sub-spots are superimposed to form a combined spot ( Figure 16 device, second-order spot), the optical power distribution diagram of this combined spot (Example 15):

[0127] (a), a schematic diagram of the change process of the superimposition degree of the two semi-circular sub-spots, (b0), the non-coherent superposition of the two semi-circular sub-spots, and the optical power distribution diagram of the generated combined spot (b I 、b II 、b III represent three different superimposition degrees);

[0128] Figure 19 , a schematic diagram of the geometric morphology of the reflector surface having a petal configuration, with the number of petals n = 2, 3, 4 (Example 16):

[0129] (a) Concave and convex V-shaped reflectors, (b) Concave and convex triangular pyramid reflectors, (c) Concave and convex quadrangular pyramid reflectors;

[0130] Figure 20 , a V-shaped reflective light emitter, a schematic diagram of the main reflector having a concave V-shaped reflecting surface and a single LED solid light source generating two virtual light sources; (Example 16)

[0131] Figure 21 , a Π-shaped reflective light emitter, a schematic diagram of the support plate reflecting surface having a concave V-shaped reflecting surface and a single LED solid light source generating three virtual light sources; (Example 16)

[0132] Figure 22 , a schematic diagram of the structure of a commercially available surface-mounted SMD electrode (Example 17):

[0133] (a) Taking the LED lamp bead as the origin, an ROP coordinate system is established on the LED chip substrate;

[0134] (b) A schematic diagram of the geometric relationship between the ROP coordinate system of the LED chip and the XYZO coordinate system of the direct light therapy device;

[0135] A single surface-mounted LED chip is installed at the bottom layer of the light therapy cavity, and the initial LED beam points to the cover plate of the light therapy device and irradiates the skin in a direct manner;

[0136] (c) Schematic diagram of the connection relationship between the surface-mounted LED chip electrodes and the bottom pads of the phototherapy device in a direct light therapy device;

[0137] Figure 23 , Schematic diagram of the embedded electrode structure of a non-direct light therapy device (Example 17):

[0138] (a) Taking the LED lamp bead as the origin, establish the ROP coordinate system on the LED chip substrate;

[0139] (b) Schematic diagram of the geometric relationship between the ROP coordinate system of the LED chip and the XYZO coordinate system of the "non-direct" light therapy device equipped with a V-shaped reflective light emitter;

[0140] In the V-shaped reflective light emitter, the support plate holds a single LED chip, and the initial LED light beam points to the main reflector and the bottom plate of the phototherapy device, and then deflects to point to the cover plate;

[0141] (c) Schematic diagram of the power supply connection relationship among the LED chip electrodes, the external electrodes of the V-shaped reflective light emitter, and the bottom pads of the phototherapy device in the reflective folding path;

[0142] Figure 24 , Integrated structure formed by the support plate and the LED chip package (Example 18):

[0143] (a) Schematic diagram of the integrated structure formed by encapsulating the LED chip with a glass flat sheet as the exit window and the support plate, (b) Cross-sectional view A-A (LED electrode bracket, conductive wire embedded in the support plate with a reflective surface);

[0144] Figure 25 , Schematic diagram of the structure of the embedded electrode (Example 19):

[0145] (a) Conductive wire and external electrode are embedded in the L-shaped reflective light emitter (three-dimensional view), (b) Conductive wire and external electrode are embedded in the V-shaped reflective light emitter (rear side view), (c) Conductive wire and external electrode are embedded in the V-shaped reflective light emitter (front side view), (d) Conductive wire and external electrode are embedded in the V-shaped reflective light emitter, and its main reflector has a four-cone reflecting surface;

[0146] Figure 26 , Schematic diagram of the structure of the Λ-shaped light emitter (Example 20);

[0147] (a) Schematic diagram of the Λ-shaped reflective light emitter with the main reflector as the carrier,

[0148] The initial LED light beam irradiates the main reflector;

[0149] Geometric relationship between the LED emission optical axis OL and the OZ axis of the phototherapy device (optical beam OL axis and

[0150] The included angle value of the OZ axis of the coordinate system is 155° ≤ ∠ZOL < 180°);

[0151] (b) Schematic diagram of the Λ-shaped reflective light emitter with the bottom plate of the phototherapy device as the carrier,

[0152] The initial LED light beam is reflected by the bottom plate (there is no main reflector in this Λ-shaped reflector);

[0153] Figure 27 , Schematic diagram of the virtual image light source generated by the Λ-shaped reflective light emitter (Example 21):

[0154] (a) Two Λ-shaped reflective light emitters are installed in the flat box phototherapy device, and the virtual images S1 and S2 generated by the LED solid light source S0 are located on the lower side of the bottom plate of the flat box device;

[0155] (b) One solid light source generates three virtual image light sources - a triangular pyramid reflecting surface is set in the Λ-shaped reflective light emitter;

[0156] (c) One LED solid light source S0 generates four virtual image light sources S 1a 、S 2a 、S 1b and S 2b ------ A concave quadrilateral pyramid reflector is set in the Λ-shaped reflective light emitter;

[0157] Figure 28 , The embedded electrode structure of the Λ-shaped reflective light emitter (Example 22):

[0158] (a) Schematic diagram of the power supply path formed by the outer electrode (102) of the LED chip → the inner conducting wire (103) of the Λ-shaped bracket → the chip electrode bracket (65);

[0159] (b) Cross-sectional view of the integrated packaging structure of the LED chip and the support;

[0160] Connection method of the LED lamp beads, the reflective surface of the chip substrate, the Λ-shaped bracket and the embedded conducting wire - outer electrode in the light emitter.

[0161]

Description of the attached drawing reference numerals

[0162] 1 - Light Emitting Diode (LED); 100 - Reflective light emitter; 101 - Initial light ray (the central axis of the initial LED light beam); 102 - Outer electrode; 103 - Conducting wire; 104 - Λ-shaped bracket;

[0163] 2 - Support;

[0164] 3 - Main reflector; 301 - Auxiliary reflector;

[0165] 4 - Cavity; 401 - Cover plate; 402 - Bottom plate; 403 - Frame; 404 - Pad;

[0166] 51 - First - order light spot; 52 - Second - order light spot (second - order light spot S a and S b ); 501 - First - reflection light ray; 502 - First - transmission light ray; 503 - Second - reflection light ray; 504 - Second - transmission light ray; 505 - Third - reflection light ray; LED solid - light source S0, LED virtual - light sources S1 and S2;

[0167] 601 - Chip internal lamp beads; 61 - Chip substrate; 62 - Electrode connection part; 63 - Cover - lens area; 6300 - Quartz flat sheet; 6301 - Metal base lens; 6302 - Metallized coating; 64 - Radiator; 65 - Chip internal electrode bracket;

[0168] 7 - Skin. Detailed implementation mode

[0169] The present application will be described in more detail below. Preferred embodiments of the present application are shown in the drawings. However, the present application can be implemented in many other different forms and is not limited to the embodiments described herein.

[0170] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0171] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present application.

[0172] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0173] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs.

[0174] Table of Embodiments

[0175] The following is divided into 5 technical topics to separately describe the supporting technical solutions for implementing the same inventive concept:

[0176] Structural solutions of non-direct light therapy devices: Embodiments 1 to 2;

[0177] LED chips, supports, and reflective surfaces are encapsulated into an integrated component: Embodiments 3 to 4;

[0178] Integrated devices for converting LED solid light sources into virtual image light sources: Embodiments 5 to 16;

[0179] Structures of embedded electrodes: Embodiments 17 to 22;

[0180] Structures of control circuits for light therapy devices: Embodiment 23.

[0181] Embodiment 1: Structure of the light therapy device:

[0182] According to the same inventive concept, the light therapy device of the present invention has an outer shape of a flat box or a flexible film.

[0183] An air layer between the cover plate 401 and the bottom plate 402 mounts the integrally encapsulated light-emitting bodies and forms an array. As Figure 1 shown:

[0184] The flat box device is shown in Figure (a):

[0185] The cavity includes a cover plate 401, a bottom plate 402, and a frame; the skin 7 is located outside the cover plate 401; five side-mounted V-shaped reflective light-emitting bodies 100 are installed in the box-shaped cavity;

[0186] The flexible film device is shown in Figure (b):

[0187] The flexible film is a curved double-layer structure composed of a cover plate 401 and a bottom plate 402. The flexible material can wrap the human torso or limb. Three side-mounted V-shaped reflective light-emitting bodies 100 are installed in the cavity of the flexible film; a flat box device with five L-shaped reflective light-emitting bodies 100 installed is shown in Figure (c);

[0188] The cavity cover plate 401 is made of a material with an ultraviolet reflection coefficient greater than the transmission coefficient, including a material with an adjustable ultraviolet transmission / reflectance beam splitting ratio; as a preferred embodiment, a fluoropolymer is used, including polydimethylsiloxane (abbreviation PDMS) and polytetrafluoroethylene, and the partial transmittance of polytetrafluoroethylene ≤ 20%, and the partial reflectance ≥ 60%.

[0189] The surface of the bottom plate 402 is made of an ultraviolet reflective material. As a preferred embodiment, the material of the bottom plate 402 is a polished aluminum film with a reflectivity ≥ 60%.

[0190] Embodiment 2: Technical features of the non-direct light therapy device:

[0191] For Figure 2 (a) The technical differences between the non-direct type and Figure 2 (b) the direct type are briefly described as follows:

[0192] The basic feature of the direct type device is that the initial light ray 101 emitted by the light emitting diode 1 directly irradiates the skin 7 along a straight path. That is, the initial light ray 101 points to the cover plate 401, and this initial light ray passes through the upper cover plate 401 in a transmissive manner to irradiate the skin 7.

[0193] Figure 2 (b) The defined value of the included angle is ∠ZOL≌0°. The axis OL of the light emitting diode and the OZ axis of the light therapy device have a "coaxial" geometric relationship: the initial light ray of the light emitting diode 1 is represented by the direction vector OL.

[0194] The basic feature of the non-direct type device is that the initial light ray 101 emitted by the light emitting diode 1 has to experience at least one reflection before reaching the skin.

[0195] Figure 2 (a) The defined value of the included angle is 155°>∠ZOL≧90°. The axis OL of the light emitting diode 1 and the OZ axis of the light therapy device have a "non-coaxial" geometric relationship:

[0196] Embodiment 3: The LED chip, the support member 2 and the reflective surface are encapsulated into an integrated component:

[0197] The similarities and differences in the structures of the LED chips used in the present invention and commercially available chips are briefly described as follows:

[0198] Commercially available LED chips are SMD light emitting components (SMD devices original text: Surface Mounted Devices) that are widely used and have mature technologies in this industry. Such commercially available LED chips can be directly mounted (soldered) on the pads of a printed circuit board.

[0199] The difference between the present invention and commercially available SMD LED chips lies in that Figure 3 (a) The LED chip is far from the pad 404 of the printed circuit board, and the inner electrode 65 of the chip cannot directly contact the pad 404. The reason is that the present invention has lifted the LED chip above the printed circuit board with the support member 2.

[0200] Figure 3The structural diagram of the LED chip used in this device. Figure (a) depicts the three-dimensional structure of the LED chip, Figure (b) is the top view of the LED chip, and Figure (c) is the cross-sectional view of the LED chip.

[0201] Figure 3 Among them, the components related to the operation of phototherapy include: the lamp beads 601 inside the chip, the chip substrate 61; the electrode connection part 62; the cover lens area 63, the metal base lens 6301, the metallized coating 6302; the heat sink 64, and the electrode support 65 inside the chip.

[0202] The support 2 is a component made of a hard material with a reflective surface;

[0203] The inner side surface at the upper end of the support 2 is encapsulated with the chip substrate 61 to form an integrated component; the support 2 holds up the chip substrate 61, making the light-emitting diode 1 located above the XOY plane and higher than the midpoint of the thickness line between the cover plate 401 and the bottom plate 402;

[0204] Figure 4 It is a schematic diagram of the integrated structure formed by the support 2 with a reflective surface and the LED chip substrate 61. (a) is a three-dimensional structure diagram of the LED chip and the support with a convex lens as the exit window, and (b) is the A-A cross-sectional view of the LED chip.

[0205] The above integrated packaging structure endows the conventional LED chip with the following new technical characteristics:

[0206] Characteristic 1, the front of the LED chip is a light output window composed of a spherical metal base lens 6301. The back of the chip substrate 62 is a reflective surface, and its optical function will be Figure 8 described in detail;

[0207] Characteristic 2, the support 2 holds up the LED chip and restricts the position of the chip substrate 62, making it located above the XOY plane. That is to say, the LED chip is not directly installed on the bottom plate of the phototherapy device, but is placed between the cover plate 401 and the bottom plate 402, and the light-emitting point of the light-emitting diode 1 is higher than the midpoint of the thickness line between the cover plate 401 and the bottom plate 402.

[0208] Characteristic 3, the conductive wire 103 embedded inside the support is the current path for the device bottom plate pad 404 to supply power to the inner electrode of the LED chip. For the detailed structure of the embedded electrode, please refer to Embodiments 17 to 22.

[0209] Embodiment 4: Three basic configurations of the reflective light emitter:

[0210] The reflective light emitter is an integrated device composed of a light-emitting diode 1, a support 2, and a folded optical path element; among them,

[0211] The folding optical path element includes the main reflector 3, and / or the auxiliary reflector 301, and the reflective surface of the support member 2;

[0212] According to the same inventive concept, the structure of the reflective light-emitting body is any one of the following three configurations, including: side-mounted V-shaped, or L-shaped, or inverted Π-shaped. The pictogram Π is the capital Greek letter.

[0213] Figure 5 (a) represents a side-mounted V-shaped reflective light-emitting body, [90° < α ≤ 155°]; α represents the clockwise angle between the support member 2 and the main reflector 3;

[0214] Figure 5 (b) represents an L-shaped reflective light-emitting body, [β ≌ 180° - α]; β represents the counterclockwise angle between the support member 2 and the main reflector 3;

[0215] Figure 5 (c) is a three-dimensional schematic diagram of an inverted Π-shaped reflective light-emitting body.

[0216] The above three integrated structures endow the conventional LED chip with the following new technical characteristics:

[0217] Characteristic 1, the support member 2 defines the orientation of the initial light ray 101 of the light-emitting diode 1, so that it first irradiates the main reflector 3, or the bottom plate 402;

[0218] Characteristic 2, the folding optical path transforms the LED solid light source into a virtual image light source, and the virtual image light source irradiates the skin in a non-direct way.

[0219] Specifically, a single light-emitting diode 1 irradiates the folding optical path element, generating at least one virtual image light source, and the virtual image light source is located below the XOY plane. The related optical path structure will be described in detail in Embodiments 5 to 16.

[0220] Embodiment 5: Integrated device for transforming an LED solid light source into a virtual image light source - side-mounted V-shaped reflective light-emitting body:

[0221] Figure 6 It is a schematic diagram of the structure of a side-mounted V-shaped reflective light-emitting body. (a) describes the geometric relationship between the emission optical axis OL of the light-emitting diode 1 and the OZ axis of the light therapy device coordinate system, and the angle Φ > 90°.

[0222] As Figure 6 (b) shows that the support member 2 is a rectangular plate-shaped or strip-shaped member, and the lower end of the plate-shaped member is connected to the left end of the main reflector 3; the clockwise angle between the plate-shaped member of the support member 2 and the mirror body of the main reflector 3 is 25° ≤ ∠α < 90°, and the outer shape of this device is side-mounted V-shaped, and the integrated package device is called a V-shaped reflective light-emitting body;

[0223] As Figure 6 (c) shows, in the V-shaped structure, the initial light ray 101 points downward to the side, and the included angle 25° ≤ ∠AOB < 90°; a first-order light spot 51 is formed on the main reflector 3.

[0224] Figure 7 Among them, two V-shaped reflective light-emitting bodies are placed in the flat cavity 4. The main reflector 3 is closely attached to the bottom plate 402; the light-emitting diode 1 is located inside the upper end of the left support member 2, and the emitted initial light ray 101 irradiates the surface of the main reflector 3, so that a part of the light emitted by the LED solid light source S0 forms a virtual image S1 at the mirror-symmetrical position on the lower side of the bottom plate 402.

[0225] The height of the light-emitting diode 1 relative to the bottom plate is H millimeters, which is equivalent to placing two virtual image light sources S1 and S2 outside the device bottom plate 402. It is equivalent to "translating" the LED solid light source 2H millimeters away from the skin.

[0226] Embodiment 6: A reflective surface is provided on the back of the substrate to reduce the shielding effect of the LED chip:

[0227] In the direct light therapy device, as Figure 2 (b) shows, the substrate of the light-emitting diode 1 is closely attached to the bottom plate 402, and the light cannot reach the back of the LED chip.

[0228] In the non-direct light therapy device, as Figure 2 (a) shows, the light-emitting diode 1 is lifted above the bottom plate 402 by the support member 2, that is, on the upper side of the XOY plane. In principle, the chip substrate 61 is opaque and blocks the light, resulting in a shadow area in the light therapy output light spot.

[0229] A reflective surface is provided on the outer surface of the support member 2 of the present invention, which is equivalent to the chip substrate 61 having a reflective function, thereby reducing the adverse effect of the shadow: that is, in the cavity 4, when a part of the light reaches the position of the LED chip substrate 61, the reflective surface on the outside of the support member 2 deflects this part of the light to the shadow area.

[0230] Figure 8 Among them, the left V-shaped reflective light-emitting body emits the initial light ray 101, and this initial light ray propagates along two possible paths:

[0231] The first path: light ray 101 → 501 → 502. The primary transmission light ray transmitted from the cover plate 401 to the skin 7 is marked as the 502 light ray. At the same time, part of the light energy will propagate to the skin 7 along the second path under the reflection of the cover plate 401.

[0232] The second path: light ray 101 → 501 → 503 → 505 → 504.

[0233] Among them, the light ray 505 is the triple-reflected light ray generated from the back surface of the left V-shaped reflective light-emitting body LED chip (the reflective surface of the support member 2). This example shows that the light ray originally blocked (or absorbed) by the chip substrate 61 is deflected by the reflective surface to the shadow area, making the light intensity distribution reaching the skin 7 more uniform.

[0234] Example 7: Integrated device for transforming an LED solid light source into a virtual image light source - L-shaped reflective light-emitting body:

[0235] Figure 9 It is a schematic structural diagram of an L-shaped reflective light-emitting body. (a) describes the geometric relationship between the emission optical axis OL of the light-emitting diode 1 and the OZ axis of the light therapy device coordinate system, with the included angle 155° ≥ β > 90°. (b) describes the first-order light spot 51 formed by the L-shaped reflective light-emitting body on the bottom plate 402 of the light therapy device.

[0236] The support member 2 is a rectangular plate-shaped or strip-shaped component, and the lower end of the plate-shaped component is connected to the right end of the main reflector 3; the counterclockwise included angle between the plate-shaped component of the support member 2 and the mirror body of the main reflector 3 is 90° < ∠β ≤ 155°. The shape of this device is L-shaped, and the integrated packaging device is called an L-shaped reflective light-emitting body;

[0237] Figure 10 It is a schematic diagram of forming a folded optical path by the L-shaped reflective light-emitting body and generating a virtual image by the LED solid light source. (a) describes the optical paths of two L-shaped reflective light-emitting bodies each generating a first-order light spot 51 on the bottom plate of the light therapy device;

[0238] The main reflector 3 is placed on the bottom plate 402; the light-emitting diode 1 is located outside the upper end of the right support member, and the emitted initial light ray 101 irradiates the reflective surface of the bottom plate 402 in the lower right, so that a part of the light rays emitted by the LED solid light source S0 forms a virtual image S2 at the mirror-symmetrical position on the lower side of the bottom plate 402.

[0239] Figure 10 (b) is a schematic diagram of the LED solid light source S0 generating virtual images S1 and S2 outside the lower side of the cassette light therapy device. The height of the light-emitting diode 1 relative to the bottom plate 402 is H millimeters, which is equivalent to placing two virtual image light sources S1 and S2 outside the bottom plate 402 of the device. It is equivalent to "translating" the LED solid light source 2H millimeters away from the skin.

[0240] Example 8: Common characteristics of the V-shaped reflective light-emitting body and the L-shaped reflective light-emitting body in generating virtual image light sources:

[0241] The structures of the V-shaped reflective light-emitting body and the L-shaped reflective light-emitting body are different, but the optical paths for forming virtual images have commonalities.

[0242] In Figure 11(a1) In the side-mounted V-shaped device, the angle α between the reflecting surface of the support member 2 and the main reflecting mirror 3 is an acute angle, and the initial light ray 101 generates a first-order light spot 51 on the surface of the main reflecting mirror 3.

[0243] In Figure 11 (b1) In the L-shaped device, the angle β between the reflecting surface of the support member 2 and the main reflecting mirror 3 is an obtuse angle, and the initial light ray 101 generates a first-order light spot 51 on the bottom plate 402. In the above two optical paths, the initial light ray 101 is directed downward to the side, and the first-order light spot 51 is located in the plane where the bottom plate 402 is located, rather than directly irradiating on the skin 7.

[0244] Figure 11 (a2) is a schematic diagram of the optical path for the LED light beam to irradiate the main reflecting mirror 3 to generate a virtual image light source S1;

[0245] Figure 11 (b2) is a schematic diagram of the optical path for the LED light beam to irradiate the bottom plate 402 to generate a virtual image light source S1;

[0246] Figure 11 (a2, b2) generally represents the commonality of the V-shaped reflective light emitter and the L-shaped reflective light emitter in generating a virtual image light source:

[0247] Taking Figure 11 (a2) as an example, the light-emitting diode 1 is denoted as S0. The LED solid light source forms a first-order light spot 51 on the reflecting surface of the main reflecting mirror 3 and a second-order light spot 52 on the exit surface P. The distance from the main reflecting mirror 3 to the exit surface P (i.e., the approximate thickness of the device) is denoted as H, and the distance from the virtual image light source S1 to the exit surface P is 2H. Based on this calculation, when the actual thickness of the device is approximately equal to H, the actual light source S0 irradiates the exit surface P through the folded optical path, which is equivalent to the irradiation effect generated by the virtual image light source S1 passing through a device with a thickness of 2H on the exit surface P.

[0248] Example 9: Optical power distribution diagram of the output light spot of the virtual image light source (numerical simulation):

[0249] Referring to Figure 11 (a2, b2) for the optical path, in this example, the numerical simulation method is used to state the common characteristic features of the V-shaped reflective light emitter and the L-shaped reflective light emitter in generating a virtual image light source.

[0250] Figure 12 (a) is a schematic diagram of the light ray transmission mode of the virtual images S1 and S2 for numerical simulation. The figure shows a simplified structure of a light emitter, and the main reflecting mirror 3 is omitted in the structure, and only the bottom plate 402 is used as the horizontal reflecting surface of the folded optical path.

[0251] In the figure, the output direction of the initial light ray 101 of the left light-emitting diode 1 points to the bottom plate 402; after being reflected by the bottom plate 402, a primary reflected light ray 501 is formed. The virtual image light source S1 is located on the reverse extension line of the light ray 501, that is, below the bottom plate 402. At the same time, the left light-emitting diode 1 on the right generates a virtual image light source S2 below the bottom plate 402.

[0252] Between the left support and the right support, the light propagation path is as follows:

[0253] The primary reflected light ray 501 is generated by the reflecting surface of the bottom plate 402; at the same time, the secondary reflected light ray 503 is generated by the inner reflecting surface of the cover plate 401; the secondary reflected light ray 503 irradiates the reflecting surface of the right support 2, generating a tertiary reflected light ray 505.

[0254] The LED chip body was originally an obstacle, causing a shadow area to appear on the exit surface. The light ray 505 can enter this shadow area, which has the beneficial effect of reducing the local shadow of the output light spot.

[0255] In the digital simulation model, a single light-emitting diode 1 generates at least one virtual image light source, and the virtual image light source is located below the XOY plane and irradiates the skin 7 in a non-direct way;

[0256] An array composed of M reflective light-emitting bodies generates at least M virtual image light sources (M > 3). The sub-beams corresponding to the respective virtual image light sources are reflected and diffusely reflected along multiple paths in the cavity 4, and a synthetic light spot meeting medical requirements is formed on the skin surface in a non-coherent superposition manner of multiple sub-beams.

[0257] The numerical simulation model of the device structure used in this embodiment is as Figure 12 (b) shown. The structural parameters of the device are as follows: the thickness of the cavity 4 is 5 mm, the distance from the LED chip to the bottom plate 402 is 2.35 mm, the main axis OL of the initial light ray 101 points to the bottom plate 402, and the included angle Φ = 155°, that is, the included angle ∠ZOL between the initial light ray 101 and –OZ is 25°; the reflectivity of the bottom plate 402 is 100%; the reflectivity of the cover plate 401 (i.e., the exit surface P) is 60% and the transmittance is 20%.

[0258] Figure 12 (c) to (e) are the numerical simulation results of the light power distribution of the light spot. Among them, in the devices numbered c1, d1, and e1, the support 2 is not pasted on the back of the LED chip:

[0259] Figure 12 (c1) is the output light spot (numerical simulation) of a single light-emitting body. In the figure, the thick black line frame indicates that the LED chip body blocks the light, causing a local dark area to appear in the output light spot, and the relative light power density of this dark area is approximately equal to 0.

[0260] Figure 12 (d1) and Figure 12 (e1) is the optical power distribution (numerical simulation) of the incoherent superposition of double spots when two light-emitting bodies emit light simultaneously. When the distance between the two light-emitting bodies is large, for example, d = 22 mm, there is an obvious dark area between the two output spots, and the optical power density in the dark area is 40% relative unit. When the distance between the two light-emitting bodies is small, for example, d = 12 mm, the dark area between the two output spots weakens, and the optical power density in the dark area is 70% relative unit.

[0261] In the devices numbered c2, d2, and e2, a support member 2 is pasted on the back of the LED chip. In the figure, part of the initial light rays of the left light-emitting body are reflected into the dark area of the right spot, so that the optical power density in the dark area is greater than 20% relative unit.

[0262] Figure 12 (f) is the output spot (simplified model, numerical simulation) of a V-shaped reflective light-emitting body 4×4 array. Among them, the spot areas corresponding to the 3×4 light-emitting bodies on the right show an approximately uniform optical power distribution. However, the optical power distribution in the spot area corresponding to the left column (involving 4 light-emitting bodies) is significantly weakened.

[0263] The main reason for the darker left side of the spot is that the left column of LED chips 1 is at the edge of the array, and their bodies block the light rays emitted by themselves. Therefore, within the thick black line frame in the figure, the optical power density is approximately equal to 0. The situation of the three right columns of light-emitting bodies is different. Although they also block their own initial light rays and form local shadows in the output spots. However, because the reflecting surface of the support member 2 reflects part of the light rays in the cavity 4 into the dark area, the darkness of the relevant shadows is weakened.

[0264] The improvement plan includes adding measures to eliminate the dark area on the left: for example, adding a column of light-emitting units to the left border of the device to specifically Figure 12 supplement the light of the spot on the left side of (f), thereby improving the uniformity of the optical power distribution of the entire array spot. It should be noted that for medical use, a change in the local optical power of the spot less than 20% is allowed. Therefore, after Figure 12 locally supplementing the light on the left side of (f), the output uniformity of this device can meet the acceptance indicators of the medical device competent department.

[0265] Example 10: Integrated device for converting an LED solid light source into a virtual image light source ------ inverted Π-shaped reflective light-emitting body:

[0266] Figure 13It is a schematic structural diagram of an inverted Π-shaped reflective light emitter. As shown in Figures (c) and (d), the support member 2 is a rectangular plate-shaped or strip-shaped component, and the lower end of the plate-shaped component is connected to the left end of the main reflector 3; the clockwise included angle between the plate-shaped component of the support member 2 and the mirror body of the main reflector 3 is 25° < ∠α ≤ 90°;

[0267] The auxiliary reflector 301 is a rectangular plate-shaped component, and the lower end of the plate-shaped component is connected to the right end of the main reflector 3; the counterclockwise included angle between the plate-shaped component of the auxiliary reflector 301 and the mirror body of the main reflector 3 is ∠β ≌ (180° - α);

[0268] The outer shape of this device is in an inverted Π shape, and the integrated packaging device is called a Π-shaped reflective light emitter.

[0269] Figure 13 (a) is a structural diagram of a V-shaped No. 1 light emitter, and (b) is a structural diagram of an L-shaped No. 2 light emitter.

[0270] Figure 13 (c) is a structural diagram of an inverted Π-shaped reflective light emitter, and (d) is a side view of the inverted Π-shaped reflective light emitter;

[0271] Comparing the configurations of the above two figures (a) and (b) with the configuration of Figure (c), it can be seen that the Π-shaped reflective light emitter combines the advantages of the V-shaped reflective light emitter and the L-shaped reflective light emitter.

[0272] The advantage of the Π shape is that the same light-emitting device generates two virtual image light sources, integrating two optical paths of Figure 11 (b1\b2). Specifically, a virtual image light source S1 is generated below the main reflector 3, and a virtual image light source S2 is generated below the reflective surface of the support member 2.

[0273] In contrast, Figure 16 When two separate L-shaped reflective light emitters are connected in series, the relative position between them is prone to errors. And Figure 13 In (c), the light-emitting diode 1 maintains a fixed geometric relationship with the main reflector 3 and the reflective surface of the support member 2 (in the shape of an inverted Greek letter Π). Therefore, even if the Π-shaped reflective light emitter is placed arbitrarily, the relative positions of the three reflectors of this combined light-emitting device will not have geometric errors.

[0274] Example 11: 2 to 3 V-shaped reflective light emitters are connected in series:

[0275] Figure 14 It is a schematic diagram of 2 to 3 V-shaped reflective light emitters connected in series:

[0276] (a) is a three-dimensional schematic diagram I of two light-emitting bodies connected in series, (b) is a three-dimensional schematic diagram II of two light-emitting bodies connected in series, and (c) is a side view of three light-emitting bodies connected in series.

[0277] In the figure, the LED light beam of the 1# V-shaped reflective light-emitting body on the left forms a first-order light spot 51 on its own main reflector 3. At the same time, the light beam irradiates the reflecting surface of the support member 2 of the 2# V-shaped reflective light-emitting body on the right, forming another first-order light spot 51. Under the condition of ignoring the diffraction effect, the shape of the above-mentioned first-order light spot 51 can be approximated as a semicircle.

[0278] Figure 14 In (c), when three V-shaped reflective light-emitting bodies are connected in series and arranged, two semicircular first-order light spots 51 are also generated on the main reflector 3 in the middle position and the reflecting surface of the support plate inclined by the dotted line on the right.

[0279] Example 12: Arrangement of 3 or more L-shaped reflective light-emitting bodies connected in series:

[0280] Figure 15 It is a schematic diagram of the arrangement of 3 or more L-shaped reflective light-emitting bodies connected in series:

[0281] (a) is a three-dimensional schematic diagram of three reflective light-emitting bodies connected in series, and (b) is a side view of three reflective light-emitting bodies connected in series.

[0282] As Figure 15 shown, in the 1# L-shaped reflective light-emitting body on the left, the light-emitting diode 1 emits an initial light beam 101;

[0283] In the middle 2# L-shaped reflective light-emitting body, 1 / 2 of the initial light beam 101 irradiates the surface of the main reflector 3 in the horizontal position, and a semicircular first-order light spot 51 appears; the other 1 / 2 of the initial light beam 101 irradiates the surface of the reflecting surface of the support member 2 in the inclined position, and another semicircular first-order light spot 51 appears.

[0284] In the right L-shaped reflective light-emitting body, all the light beams of the light-emitting diode 1 irradiate the bottom plate 402 in the lower right, forming a complete first-order light spot 51.

[0285] In Figure (c1), three groups of L-shaped reflective light-emitting bodies are installed in the cassette light therapy device [connected in series every 2], and Figure (c2) shows that the L-shaped reflective light-emitting bodies are densely installed on the device bottom plate 402, forming a 3×5 array.

[0286] Example 13: Two L-shaped reflective light-emitting bodies are connected in series, and two virtual image sub-light sources are superimposed to generate a combined light spot:

[0287] The structure of the series connection device is as Figure 16 (a) shown:

[0288] Two or more L-shaped reflective light emitters are arranged in series. The light-emitting diode 1 on the left irradiates the horizontally placed main reflector 3; at the same time, it irradiates the obliquely placed auxiliary reflector 301. Two virtual image light sources are generated on the lower side of the XOY plane. Specifically,

[0289] Half of the sub-beams of the initial light beam 101 emitted by the light-emitting diode 1 of the first L-shaped reflective light emitter irradiate the main reflector 3 of the adjacent second L-shaped reflective light emitter. Under the condition of ignoring the diffraction effect, a semicircular first-order light spot is formed; at the same time, the other half of the sub-beams of the initial light beam 101 emitted by the first L-shaped reflective light emitter irradiate the reflective surface of the support 2 of the adjacent second L-shaped reflective light emitter. Under the condition of ignoring the diffraction effect, another semicircular first-order light spot is formed;

[0290] The two sub-beams corresponding to the above two first-order light spots reach the output surface of the reflective light emitter along the folded reflection path and generate a composite light spot with redistributed optical power in a non-coherent superposition manner.

[0291] The above complete light propagation process is subdivided into two sub-processes. The light propagation process is explained as follows:

[0292] Figure 16 (b) shows the first sub-process. The real light source S0 irradiates the main reflector 3 to form a semicircular first-order light spot 51. Furthermore, the virtual image light source S1 forms a "oppositely oriented" second-order light spot 52 on the exit surface P.

[0293] Figure 16 (c) shows the second sub-process. The real light source S0 irradiates the reflective surface of the support plate 2, and then the virtual image light source S2 forms another "oppositely oriented" second-order light spot 52 on the exit surface P.

[0294] Figure 16 (d) shows that the above two sub-processes occur simultaneously, and the virtual image light source S1 and the virtual image light source S2 are non-coherently superposed on the exit surface P. As Figure 16 (e) shows, two semicircular sub-light spots with opposite orientations represent two virtual image light sources S1 and S2, and the two are superposed to generate a light spot with redistributed optical power.

[0295] Example 14: Two virtual image light sources are non-coherently superposed, and the orientations of the two semicircular sub-light spots in the composite light spot are different:

[0296] In Figure 16 the device of (d), the phenomenon of orientation flipping of the two sub-light spots appears. Figure 17 Further explain the orientation change process of the two semicircular sub-light spots.

[0297] The assumed light spot shape in the direct light path, as Figure 17As shown by the top circular light spot: Assume that the light-emitting diode 1 is located on the bottom plate 402. According to the direct illumination method, the light-emitting diode 1 will generate a light spot with a circular contour on the exit surface P.

[0298] The actual shape of the light spot in the non-direct light path, as Figure 17 shown by the semi-circular light spots in the second row above:

[0299] According to the principle of geometric optical reflection, during the reflection process of the LED beam, the initial circular light spot is split into two semi-circular sub-light spots. In Figure 17 the second row, the semi-circular sub-light spots are respectively labeled A and B. In theory, two L-shaped reflective light-emitting bodies connected in series will cause the orientation of the semi-circular sub-light spots to be flipped by 180°, Figure 17 and the flipped semi-circular sub-light spots are labeled A' and B'.

[0300] Figure 17 The device model relied on is: two L-shaped reflective light-emitting bodies form a series connection structure. Within the same device, a single LED solid light source S0 is located above the XOY plane and can generate two virtual images in parallel below the XOY plane, called the third type of virtual images; the sub-beams corresponding to the two virtual image light sources form two second-order light spots. The so-called second-order light spots are the synthetic light spots (S a +S b ).

[0301] Figure 17 The third and fourth rows show that the ultimately output of the two light-emitting bodies connected in series is the synthetic light spot (A'+B'). The shape of the light spot shown in this figure is equivalent to Figure 16 (d) the shape of the light spot shown.

[0302] Example 15: The optical power distribution diagram of the synthetic light spot formed by the incoherent superposition of two virtual image light sources:

[0303] In the device with L-shaped reflective light-emitting bodies connected in series, when Figure 16 the included angle β2 shown in (a) changes, Figure 16 (d) the overlapping area of the two semi-circular sub-light spots (second-order light spots) at the output surface P will change with the value of β2. The incoherent superposition of the two virtual image light sources S1 and S2, with the orientations of the two semi-circular sub-light spots being different, causes the optical power distribution to change, resulting in an improvement in the uniformity of the synthetic light spot.

[0304] The variation law of the shape of the synthetic light spot is as Figure 18 shown. Among them,

[0305] Figure 18 (a) describes the change in the overlapping area of the two semi-circular sub-light spots;

[0306] Figure 18 (b0 to b III ) is the optical power distribution diagram of the synthesized light spot. Specifically, the superposition degree of two semi-circular sub-light spots (second-order light spots) on the output surface P can be divided into three cases:

[0307] In the first case, the two semi-circular sub-light spots are separated from each other; in the middle section of the synthesized light spot, the optical power density is about 20% relative unit;

[0308] In the second case, the two semi-circular sub-light spots overlap in a small area; in the middle section of the synthesized light spot, there appears a dumbbell-shaped area with an optical power density of about 90% relative unit;

[0309] In the third case, the two semi-circular sub-light spots overlap in a large area, and an approximately square uniform light intensity area appears in the synthesized light spot, with an average optical power density of 90% relative unit.

[0310] It should be noted that for the Π-shaped reflective light-emitting body, an approximately uniform light spot with a square contour can be stably output, similar to Figure 18 (b III ) shown in the third case.

[0311] Example 16: The same reflective light-emitting body generates 3 or 4 virtual image light sources:

[0312] This example provides a geometric morphology design scheme for the folding optical path element, so that a single light-emitting diode 1 can generate 3 or more virtual images simultaneously.

[0313] The two steps of generating multiple virtual image light sources with a single solid light source are respectively

[0314] Step 1: Manufacture reflectors with different geometric morphologies.

[0315] The same reflector is divided into n parts, and the values of n are integers 2, 3, or 4 respectively. The three geometric contours of the reflector are as Figure 19 shown, including: (a) concave and convex V-shaped reflecting surfaces, (b) concave and convex triangular pyramid reflecting surfaces, (c) concave and convex quadrangular pyramid reflecting surfaces.

[0316] Step 2: Inside the reflective light-emitting body, make a part of the reflective surface a single-plane structure and another part of the reflective surface a petal-shaped structure composed of n partitions, where n is an integer and 8 ≥ n ≥ 2;

[0317] Figure 20 In the V-shaped reflective light-emitting body of

[0318] Figure 21In the Π-shaped reflective illuminator, the main reflector 3 has a planar structure, and the support plate reflecting surface 2 has a concave V-shaped reflecting surface. One light-emitting diode 1 generates three virtual image light sources S1, S 2a and S 2b ;

[0319] In summary, the inventive concept and technical implementation method of the virtual image light source described above have the following beneficial effects on improving the technical performance of the phototherapy device:

[0320] First, under the condition of thinning the device thickness, the "equivalent irradiation distance" from the light-emitting diode 1 to the skin 7 is increased.

[0321] Second, the beam energy of a single LED solid light source is dispersed over a wider area, avoiding the problem of too high local power density of the LED point light source.

[0322] Third, by increasing the number of virtual image light sources, the spatial distribution of the optical power becomes more uniform, reducing the risk that the local irradiation dose exceeds the ultraviolet radiation safety threshold.

[0323] Example 17: According to the special requirements for power supply of the folded optical path element, an embedded electrode is designed:

[0324] The traditional direct light therapy device uses surface-mounted SMD electrodes. Its characteristic is that a single LED chip is installed on the bottom layer of the light therapy cavity 4, and the chip substrate 61 is closely attached to the bottom plate 402. Thus, the inner electrode bracket 65 of the chip is directly connected to the bottom layer pad 404, as Figure 22 shown.

[0325] Figure 22 (a) Taking the LED lamp bead as the origin, establish a ROP coordinate system on the LED chip; (b) Describe the geometric relationship between the ROP coordinate system of the LED chip and the XYZO coordinate system of the direct light therapy device; (c) Describe the typical Surface Mounted Device (surface-mounted component) welding method of commercially available LED chips.

[0326] However, the above-mentioned surface-mounted components and welding methods commonly used in the optoelectronic industry are not suitable for the reflective illuminator of the present invention. The reasons are briefly as follows:

[0327] The non-direct light therapy device of the present invention has a special configuration. A single LED chip is lifted above the bottom layer by the support 2, and the chip substrate 61 is located at the upper end of the support 2, as Figure 23 (b) shown. Thus, the inner electrode bracket 65 of the chip is far from the bottom layer pad 404, resulting in the inapplicability of the traditional surface mounting and welding methods.

[0328] In view of the special power supply requirements for the folded optical path components, the electrode design concept of the present invention is to make the support plate 2 serve three purposes, namely, providing mechanical support, optical reflection, and electrical connection functions;

[0329] Figure 23 (a) Taking the LED lamp bead as the origin, establish the ROP coordinate system on the LED chip; (b) Describe the geometric relationship between the ROP coordinate system of the LED chip and the XYZO coordinate system of the "non-direct illumination type" phototherapy device equipped with the V-shaped reflective illuminator; (c) It is a schematic diagram of the power supply connection relationship among the inner electrode bracket 65 in the chip, the outer electrode of the V-shaped reflective illuminator, and the bottom pad 404 of the phototherapy device in the reflective folding path.

[0330] Example 18: Structure of the embedded electrode

[0331] The particularity of powering the LED chip lies in that the inner electrode bracket 65 in the chip is located above the XOY plane and higher than the midpoint of the thickness line between the cover plate and the bottom plate. The present invention proposes a new type of power supply component - the embedded electrode.

[0332] Step 1, manufacture a new type of packaging structure to integrate the support member 2, the chip substrate 61, the conductive wire, and the embedded electrode into an integrated component, as Figure 24 shown:

[0333] Figure (a) is a schematic diagram of the integrated structure of the LED chip with a glass flat sheet as the exit window and the support member 2; Figure (b) is the A-A cross-sectional view of the LED chip conductive wire embedded in the support member 2;

[0334] Specifically, in Figure 24 the non-mirror part of the support member 2, any one of the three methods of plating a conductive film, or pasting a conductive wire 103, or embedding a conductive wire 103 is adopted, so that the inner electrode bracket 65 on the chip substrate 61 forms a current path with the outer electrode 102 of the LED light-emitting device.

[0335] Step 2, establish a current path between the inner electrode bracket 65 in the chip and the bottom pad 404. The details of the power supply scheme are as Figure 23 , Figure 24 shown.

[0336] The outer electrode 102 of the light-emitting device is embedded at the bottom of the main reflector 3, and the conductive wire 103 is embedded in the non-mirror parts of the support member 2 and the main reflector 3;

[0337] A pad 404 is provided on the bottom plate 402, and this pad 404 is located on the XOY plane; the connection relationship of the LED drive circuit is: bottom plate pad 404 → outer electrode 102 of the light-emitting device → conductive wire 103 → inner electrode bracket 65 in the chip → inner electrode connection part 62 → chip inner lamp bead 601.

[0338] For the structural details of the lamp beads 601 and internal electrodes inside the above-mentioned chip, please refer to Figure 3 .

[0339] Figure 24 The electrical connection method between the external electrode 102 and the bottom plate 402 is similar to that of Figure 23 the connection method.

[0340] Example 19: Implementation of Embedded Electrodes - New Electrodes Embedded in V-shaped and L-shaped Reflective Emitters:

[0341] Figure 25 (a) In the L-shaped reflective emitter, the conductive wire 103 is buried in the non-mirror part of the reflective surface of the support 2, or a conductive film is plated on the non-mirror part. The external electrodes 102 of the LED lighting device are located on both sides of the main reflector 3. The bottom plate 402 is provided with pads 404, which form an electrical connection with the external electrodes 102 of the LED lighting device.

[0342] Figure 25 (b) is the rear view of the electrode of the V-shaped reflective emitter, Figure 25 (c) is the front view of the electrode. The LED chip forms an electrical connection with the external electrode 102 of the LED lighting device through the conductive wire 103.

[0343] Figure 25 (c), the main reflector 3 is a concave quadrangular pyramid surface, and the connection method of its external electrode 102 of the LED lighting device is the same as that of Figure 25 (b).

[0344] Example 20: Derived Configuration of Reflective Emitter: Λ-shaped Reflective Emitter

[0345] According to the same inventive concept, the reflective emitter has three basic configurations. As described above Figure 5 shown, including: ⑴ Side-mounted V-shaped reflective emitter, ⑵ L-shaped reflective emitter; ⑶ Inverted Π-shaped reflective emitter. (*That is, the first, second, and third configurations)

[0346] Among them, the side-mounted V-shaped structure has the following two derived configurations (*that is, the fourth and fifth configurations):

[0347] As described above Figure 6 The plate-shaped support 2 defined is split into the following two separate elements:

[0348] One of the separate elements is a small-area reflector, whose geometric area is equal to the area of the chip substrate 61. The small-area support reflector is encapsulated with the chip substrate 61 to form a new LED chip with a reflector on the back of the chip substrate 61.

[0349] The second separating component is a Λ-shaped bracket made of a thin strip of rigid material.

[0350] Derivative Configuration I (Using the main reflector as the reflecting surface): It consists of a light-emitting diode 1, a small-area reflector, a main reflector 3, and a Λ-shaped bracket 104. Among them, the Λ-shaped bracket is composed of 2 to 4 thin strips, and the outer electrode 102 is located at its lower end.

[0351] As Figure 26 (a) shows, using the main reflector 3 as the carrier, the Λ-shaped bracket 104 stands on this carrier and holds up the LED chip with a lower-area reflector on its back, making it higher than the XOY coordinate plane. This integrated package device is called a Λ-shaped (Type I) reflective light emitter. In the figure, the included angle between the initial light beam axis OL of the LED and the OZ axis of the rectangular coordinate system takes a value of 155° ≥ ∠ZOL > 180°.

[0352] Derivative Configuration II (Using the bottom plate as the reflecting surface), it consists of a light-emitting diode 1, a small-area reflector, and a Λ-shaped bracket 104. Among them, the Λ-shaped bracket is composed of 2 to 4 thin strips, and the outer electrode 102 is located at its lower end..

[0353] Using the bottom plate 402 of the light therapy device as the carrier, this bottom plate 402 has a highly reflective surface.

[0354] The Λ-shaped bracket 104 stands on this bottom plate 402 and holds up the new type of LED chip described above, making it higher than the XOY coordinate plane. This integrated package device is called a Λ-shaped (Type II) reflective light emitter.

[0355] The Type II device can be regarded as a simplified structure of the Type I. Compared with the Type I, the Type II has fewer components, and there is no main reflector 3 in the folded optical path, as Figure 26 (b) shows.

[0356] Example 21: The Λ-shaped reflective light emitter generates a virtual image light source

[0357] As Figure 27 (a) shows, the Λ-shaped reflective light emitter is installed in a flat box-type light therapy device.

[0358] Among them, a single Λ-shaped reflective light emitter emits light and propagates along the first type of path: starting from the real light source of the left-side light emitter, the initial light beam 101 of the light-emitting diode 1 → the first reflection light ray 501 → the first transmission light ray 502 → the skin 7. Among them, the virtual image S1 is located on the reverse extension line of the first reflection light ray 501.

[0359] Between two Λ-shaped light-emitting devices, some light rays may propagate along the second type of path: starting from the solid light source of the left light-emitting body, the initial light ray 101 of the light-emitting diode 1 → the first reflected light ray 501 → the second reflected light ray 503 →... → the third reflected light ray 505 → the skin 7. The ellipsis represents various reflection and diffuse reflection paths within the cavity 4.

[0360] The initial light beam 101 points downward to the bottom plate 402, and the shielding effect of the chip substrate 61 causes a local shadow area to appear on the cover plate 401. The necessity of setting a small-area reflector on the back of the LED chip is reflected in that the reflector located on the back of the chip reflects a small amount of light to the position that was originally in the shadow, having the beneficial effect of weakening the shadow. For example, Figure 27 (a)'s reflected light ray 505 reaches the position that was originally blocked by the reflector itself.

[0361] Figure 27 (b)'s Λ-shaped bracket 104 has three support points. The light-emitting diode 1 and the reflector are integrated into an integrated component, and the tripod supports the integrated component. The main reflector 3 located directly below has a triangular pyramid geometry. This enables a single light-emitting diode 1 to generate three virtual light sources on the lower side (mirror-symmetric position) of the XOY coordinate plane.

[0362] Figure 27 (b), the main reflector 3 has a quadrangular pyramid geometry. This enables a single LED solid light source S0 to generate four virtual light sources S 1a 、S 2a 、S 1b and S 2b .

[0363] Example 22: Embedded electrode ------ Electrode connection method of the Λ-shaped reflective light-emitting body

[0364] As Figure 28 (a) shows, the combination of the LED chip 1 and the reflective surface of the support 2 is located above the main reflector 3. The angle between the LED emission optical axis OL and the coordinate system OZ axis is ∠ZOL≌180°.

[0365] The basic function of the Λ-shaped bracket 104 is mechanical support. By changing the lengths of the two thin strips, the emission direction of the initial light ray 101 of the LED chip can be adjusted. So that the angle value is 155°>∠ZOL≌180°.

[0366] Another function of the Λ-shaped bracket 104 is to carry the conductive wire 103, enabling the electrode bracket 65 inside the chip substrate 61 and the external electrode 102 embedded in the main mirror 3 to form a current path. There are three methods to form the conductive path: inlaying the conductive wire 103, pasting the conductive wire 103, or plating a conductive film on the surface of the bracket.

[0367] Figure (b) is a partial enlarged schematic diagram of the embedded electrode.

[0368] The upper end of the Λ-shaped bracket 104 holds up the support member 2 with a small-area reflective surface and the chip substrate 61; the lower end of the Λ-shaped bracket 104 is connected to the main mirror 3. The four components are encapsulated into an integrated structure.

[0369] What is not shown in the figure includes: the bottom plate 402 of the light therapy device is located directly below, and pads 404 are provided on the bottom plate 402.

[0370] This embedded electrode establishes the following current path: chip internal electrode bracket 65 - substrate pad 404 → external electrode 102 of the light emitter → conductive wire 103 embedded in the Λ-shaped bracket → chip electrode bracket 65 → chip internal lamp bead 601.

[0371] The chip internal lamp bead 601 and the light output window (quartz flat plate 6300) are located on the lower side of the chip substrate 61. The LED light is directed downward of this integrated structure (i.e., directed at the device bottom plate 402).

[0372] Example 23: Control Circuit of the Light Therapy Device

[0373] The control circuit system includes a light radiation dose regulation module, a photobiological safety management module, a communication module, and a storage module.

[0374] The light radiation dose regulation module includes: a circuit for quasi-real-time detection of the light intensity in the cavity, a delayed startup and limited shutdown circuit.

[0375] The photobiological safety management module includes: a flexible tactile sensor, a microswitch, and a voice recognizer. Among them, the flexible tactile sensor and the microswitch are used to determine whether the light therapy device is closely attached to the skin. If it is not closely attached to the skin, the processor will prevent illegal startup. The voice recognizer uses a specific person voice recognition chip to determine whether the user is a user who has received training on safety operation procedures; when it is determined that the user is a specific user, the startup instruction is executed.

[0376] The photobiological safety management module can also prevent illegal operation events (including events such as over-dose irradiation of the skin and short-distance irradiation of the human eye with LED ultraviolet light) according to the signal feedback; and issue safety warnings (electronic signals or electroacoustic signals) when necessary.

[0377] The communication module receives remote control instructions sent from the outside via wireless communication, or uploads the data of this device, where the data includes the light-emitting state parameters of the LED chip, the photoelectric monitoring signal, etc.

[0378] The storage module stores the power-on and running time and the photoelectric operation parameters of the entire device.

[0379] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0380] The above embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. An indirect phototherapy device, characterized in that: It includes a cavity, a reflective light emitter, an embedded electrode and a control circuit; The cavity comprises a cover plate (401), a bottom plate (402) and a frame; the bottom plate (402) is located on the XOY plane of the rectangular coordinate system, and the OZ axis points to the skin (7) located outside the cover plate (401); The reflective light-emitting body comprises a light-emitting diode (1), a support member (2), a primary reflector (3), and / or an auxiliary reflector (301), and a reflective surface of the support member (2); The inner side surface of the upper end of the support member (2) and the chip base (61) of the light-emitting diode (1) are packaged into an integrated component; the support member (2) lifts the chip base (61) so that the light-emitting diode (1) is higher than the midpoint of the thickness line of the cover plate (401) and the bottom plate (402), and the initial light beam (101) of the light-emitting diode (1) points to the bottom of the XOY plane; The central axis of the initial light beam (101) of the light emitting diode (1) is represented by a direction vector OL, and the value of the angle ∠ZOL is limited to 155˚≧∠ZOL>90˚, or 180˚≧∠ZOL>155˚, so that the initial light beam (101) does not form a geometric optical path that directly irradiates the skin (7); The support member (2) is a component made of a hard material and having a reflective surface. In the cavity (4), when a portion of light reaches the position of the chip substrate (61), the reflective surface on the outside of the support member (2) deflects this portion of light into a shadow area. The support member (2) is a rectangular plate-shaped or strip-shaped member, the lower end of the rectangular plate-shaped member is connected to the left end of the main reflector (3); the clockwise angle α between the rectangular plate-shaped member and the main reflector (3) is 25˚<∠α≤90˚; The auxiliary reflector (301) is a rectangular plate-shaped component; the lower end of the auxiliary reflector (301) is connected to the right end of the main reflector (3); the counterclockwise angle β between the auxiliary reflector (301) and the main reflector (3) is ∠β≌(180˚-∠α); the overall shape is an inverted Π shape, which is called a Π-shaped reflective light emitter; The mirror body of the main reflector (3) is in close contact with the XOY plane of the rectangular coordinate system; the end of the main reflector (3) is connected to the lower end of the support member (2), or the other end of the main reflector (3) is connected to the lower end of the auxiliary reflector (301), so that the LED physical light source S0 located above the XOY plane is transformed into a virtual image light source S1 or / and S2 located below the XOY plane; The light propagation process is subdivided into two sub-processes: in the first sub-process, the solid light source S0 illuminates the main reflector (3) to form a semicircular first-order light spot (51), and the virtual image light source S1 forms a second-order light spot (52) with the opposite orientation on the exit surface P; in the second sub-process, the solid light source S0 illuminates the reflective surface of the support member (2), and the virtual image light source S2 forms another second-order light spot (52) with the opposite orientation on the exit surface P; The embedded electrode is embedded in the main reflector (3), or / and the auxiliary reflector (301), and a non-reflective portion of the support member (2); The control circuit is installed in the frame; the control circuit includes a light radiation dose control module, a light biosafety management module and a communication module; The electrode support (65) in the LED chip is located on the upper side of the XOY surface and higher than the midpoint of the thickness line between the cover plate (401) and the bottom plate (402); the conductive wire (103) is embedded in the non-mirror surface parts of the support member (2) and the main reflector (3), and the external electrode (102) of the light-emitting device is embedded in the bottom of the main reflector (3); the support member (2), the chip substrate (61), the conductive wire, and the embedded electrode are packaged into an integrated component; A soldering pad (404) is provided on the bottom plate (402), and the soldering pad (404) is located on the XOY plane; the connection relationship of the LED driving circuit is: bottom plate soldering pad (404) → light-emitting device external electrode (102) → conductive wire (103) → chip internal electrode support (65) → chip internal electrode connection part (62) → chip internal lamp bead (601).

2. The indirect light therapy device according to claim 1, characterized in that: The device has an appearance of a flat box or a flexible film; the cover plate (401) is made of a material whose ultraviolet reflection coefficient is greater than the transmission coefficient, and the inner surface of the bottom plate (402) is made of an ultraviolet reflection material.

3. The indirect phototherapy device according to any one of claims 1 to 2, characterized in that: Inside the reflective illuminant, a portion of the reflective surface is a single-plane configuration, and another portion of the reflective surface is a petal-shaped configuration consisting of n partitions, 8≥ integer n≥2; The central axis of the initial light beam (101) of the light emitting diode (1) is OL. Under the condition that the angle between the OL axis and the OZ axis is 180°≥∠ZOL>155°, the light emitting diode (1) illuminates the petal-shaped configuration, and the n-petal reflection surfaces enable a single LED physical light source S0 to generate n virtual image light sources.

4. The indirect light therapy device according to claim 1, characterized in that: The control circuit is used to achieve light radiation dose regulation, photobiological safety management and communication; The light radiation dose control module includes: a circuit for quasi-real-time detection of the light intensity in the cavity, a delayed start-up and time-limited shutdown circuit; the light radiation dose is equal to the product of the radiation source intensity of the device and the radiation exposure time T; the phototherapy device generates narrow-band UVB radiation with a wavelength of 298±20nm, and each exposure time T≥2 minutes; the effective irradiation area is 2% to 20% of the human skin area; The photobiological safety management module includes: a flexible tactile sensor, a micro switch, and a voice recognizer; the flexible tactile sensor determines whether the phototherapy device is close to the skin; the voice recognizer determines whether the user has received training on safe operating procedures; determines whether the operation monitoring signal is normal, and prevents illegal operation events; The communication module receives remote control instructions from the outside, or uploads photoelectric operation data related to phototherapy.

Images