LED packaging device with light homogenizing cavity and use method thereof

Abstract

The present invention belongs to the field of medical devices, and specifically discloses an LED package device with a uniform light cavity and a method for using the same. The device is composed of a uniform light cavity, a light emitting diode and an air pressure regulating device. The uniform light cavity is composed of a covering layer, a supporting member and a bottom layer; the covering layer and / or the bottom layer are plastic film parts. The air pressure regulating device is connected to the uniform light cavity. By evacuating or inflating, the pressure difference between the cavity and the atmospheric environment is changed, so that the plastic film part in a relaxed state is deformed to form an inwardly concave or outwardly convex air pressure type optical element. The concave surface and the convex surface are off-axis rotating paraboloids or quasi-conical surfaces. The covering layer is both a reflective surface of the uniform light cavity and a light output window. The light beam output by the light emitting diode array is reflected and diffusely reflected in the uniform light cavity and propagates along multiple paths. The output light spot forms an approximately uniform light intensity distribution on the skin, thereby reducing the probability of ultraviolet damage to DNA. The air pressure type hollow structure has a small dead weight, which improves user comfort.

Description

Technical Field

[0001] The present invention relates to the field of medical devices, and in particular to an LED packaging device with a light-homogenizing cavity and a use method thereof. Background Art

[0002] Ultraviolet light therapy is a non-invasive, non-drug rehabilitation auxiliary treatment method.

[0003] Ultraviolet radiation can produce vitamin D precursors in the skin. This endogenous vitamin D helps the body absorb calcium and phosphorus, reducing the risk of osteoporotic fractures.

[0004] Exposure to ultraviolet radiation from light-emitting diodes can induce the production of a variety of hormones or peptides (including adrenocorticotropic hormone, melanocyte-stimulating hormone and endorphins), which have a positive effect on the prevention and treatment of non-skin autoimmune diseases.

[0005] However, when the illegal exposure leads to excessive doses, UV radiation has side effects. For example, DNA is the main target of UV radiation that directly or indirectly causes cell damage. UV radiation distorts the structure of DNA, introducing bends or kinks, thereby hindering transcription and replication. The harmful consequences of DNA damage include: cell death, mutations, skin photoaging, etc.

[0006] Therefore, reducing the probability of UV damage is a prerequisite for phototherapy to benefit patients.

[0007] Many LED ultraviolet light therapy research results (Light Emitting Diode, LED) have been publicly reported in this professional field. Among them, some research results have been made into prototypes (referred to as traditional wearable devices) and have produced significant therapeutic effects. However, the commercially available light therapy devices have shortcomings such as thick appearance and heavy weight on the human body:

[0008] Medical research results have shown that expanding the irradiation area is an effective measure to reduce the probability of UV damage. For traditional LED phototherapy devices, it is not difficult to expand the luminous area (just increase the cross-sectional area of ​​the structure). The difficulty lies in that the structural parts of traditional wearable devices are made of medical silicone. If the cross-sectional area of ​​the structure is increased, the amount of silicone will inevitably increase, resulting in an increase in weight. For example, a certain phototherapy device on the market is similar in size and weight to a tile (specifications 30*30 cm^2). This means that the user is required to carry a tile weighing about 1.5kg, and a single treatment lasts about 30 minutes. The weight of this type of prototype is relatively large, and it is difficult to convince the elderly to continue to receive phototherapy happily throughout the winter.

[0009] In summary, although the irradiation area of ​​traditional wearable devices is large and the safety is up to standard, they are heavy and have poor usability, which makes the overall performance not in line with the human factors engineering design concept of "people-oriented, safe, and pleasant". Summary of the invention

[0010] The purpose of the present invention is to both expand the effective exposure area and reduce the weight of the whole machine.

[0011] In order to overcome the shortcomings of traditional technology, the present invention proposes the following technical measures: using lightweight plastic film to replace the heavy glass or / and silicone plate in traditional devices, designing a hollow structure, and using a flat closed space to produce a light homogenization function. Furthermore, using the negative pressure difference (or positive pressure difference) of the air to "tighten and deform" the film preform to form a pneumatic light homogenization optical element with performance that meets industry standards, it produces a practical effect of a large treatment area, good safety performance, and light weight.

[0012] To achieve the above-mentioned object, the present invention provides an LED packaging device with a light-homogenizing cavity, comprising a covering layer, a supporting member, a bottom layer, a light-emitting diode and a gas pressure regulating device;

[0013] The support member is provided with a circular light-through hole or a square light-through hole with arc chamfers, and the two sides of the light-through hole of the support member are respectively connected to the cover layer and the bottom layer in an airtight manner to form a uniform light cavity, and the uniform light cavity contains a closed air gap;

[0014] The light homogenizing cavity is connected to the air pressure regulating device, and the air pressure regulating device regulates the air pressure in the light homogenizing cavity to a preset value;

[0015] The covering layer is a plastic film made of a material with a transmission / reflection splitting ratio of ≤ 1 / 2, and the inner surface reflectivity of the material is ≥ 60%. The covering layer is both a reflective surface of the light homogenizing cavity and a light output window of the LED packaging device;

[0016] The bottom layer is a plastic film or a hard plate, the inner surface of the bottom layer is covered with an aluminum reflective layer, the inner surface reflectivity is ≥ 60%, or it is provided with a sawtooth microstructure, or a microconvex or microconcave scattering structure;

[0017] When the pressure difference between the light homogenizing cavity and the environment is zero, the plastic film member is in a relaxed state;

[0018] When the pressure difference between the homogenizing cavity and the environment is less than zero, the atmospheric pressure causes the plastic film product to become concave, and the shape of the stretched plastic film product is an off-axis rotating parabola or a quasi-conical surface, resulting in a concave-plane structure or a concave-concave structure formed on both sides of the homogenizing cavity;

[0019] When the pressure difference between the homogenizing cavity and the environment is greater than zero, the atmospheric pressure causes the plastic film product to become convex, and the shape of the stretched plastic film product is an off-axis rotating parabola or a quasi-conical surface, resulting in a convex-plane structure, a convex-conical structure, or a convex-convex structure on both sides of the homogenizing cavity;

[0020] The light emitting diode is installed at the center or middle of the bottom layer; or the light emitting diode is installed on the inner wall of the light-through hole of the support member; or a grid-shaped support frame is installed on the light-through hole of the support member, the grid-shaped support frame is made of transparent material, and the light emitting diode is installed on the grid-shaped support frame;

[0021] The light from the light emitting diode is propagated along multi-path reflection and diffuse reflection in the light homogenizing cavity, producing a light homogenizing effect, and generating a light spot with an approximately uniform distribution of light power density on the outside of the covering layer; the effective irradiation area of ​​the light spot is larger than the cross-sectional area of ​​the transmitted light beam of a single light emitting diode directly irradiating the covering layer;.

[0022] Preferably, the air pressure regulating device comprises an air guide joint, an air guide tube, and a micro air pump; the air guide joint is arranged on the support member and is connected to the light homogenizing cavity; the micro air pump is connected to the air guide joint through the air guide tube.

[0023] Preferably, the air pressure regulating device also includes an air pressure sensor and an air pressure control module, the air pressure sensor is used to monitor the pressure difference between the homogenizing cavity and the external environment, and the air pressure control module controls the micro air pump to start exhaust, inflation, or stop according to the monitoring result of the air pressure sensor to maintain the air pressure in the homogenizing cavity at a preset value.

[0024] The pressure sensor is used to monitor the pressure difference between the homogenizing cavity and the atmosphere; the shape of the concave side of the homogenizing cavity is indirectly monitored through the pressure difference, and the shape parameter is the quantitative basis for the optical performance of the plastic film optical element. The pressure control module controls and adjusts or stabilizes the pressure difference; when the air pressure is normal, the LED driving power supply is turned on; when the air pressure is abnormal or the operating state is abnormal, the LED driving power supply is cut off.

[0025] Preferably, the covering layer is a film made of fluorine-containing polymer or polydimethylsiloxane material;

[0026] The support is made of non-transparent engineering plastic (strong in resistance to deformation under load and not easy to deform), with a thickness of not less than 1mm and a reflectivity of the inner surface of ≥60%;

[0027] Alternatively, the support member is made of quartz or polydimethylsiloxane material, and the transmittance is ≥ 60%.

[0028] Preferably, in the concave-plane structure, the light-emitting diode is installed at the center or middle of the bottom layer, and the bottom layer is a plastic or metal sheet with an aluminum reflective layer, the thickness of which is not less than 1 mm, and the inner surface reflectivity is ≥ 60%;

[0029] When the pressure difference between the airtight homogenizing cavity and the environment is less than zero, the shape of the cover layer is an off-axis rotating parabola, and the inner surface of the bottom layer is approximately a plane. At least four light-emitting diodes emit light in the homogenizing cavity, generating a light spot with approximately uniform light intensity distribution outside the cover layer.

[0030] Preferably, in the concave-plane structure, the light-emitting diodes are evenly mounted on the inner wall of the support, and the number of the light-emitting diodes is ≥4;

[0031] The bottom layer is a plastic or metal sheet with an aluminum reflective layer, the thickness of which is not less than 1 mm, and the inner surface reflectivity is ≥ 60%;

[0032] When the pressure difference between the light homogenizing cavity and the environment is less than zero, the shape of the cover layer is a cone-like surface; and the inner surface of the bottom layer is a sawtooth microstructure.

[0033] Preferably, in the concave-concave structure, the light-emitting diodes are evenly mounted on the inner wall of the support, and the number of the light-emitting diodes is ≥4;

[0034] The bottom layer is a plastic film with an aluminum reflective layer, and the material reflectivity is ≥ 60%; the inner surface of the bottom layer is provided with a micro-convex or micro-concave scattering structure;

[0035] When the pressure difference between the light homogenizing cavity and the environment is less than zero, the shapes of the cover layer and the bottom layer are both off-axis rotation paraboloids; the axes of the rotation paraboloids of the cover layer and the bottom layer are approximately coincident.

[0036] Under the condition that the pressure difference between the homogenizing cavity and the environment is greater than zero and less than the rupture threshold of the thin film material, the shapes of the cover layer and the bottom layer are both off-axis rotation paraboloids; the axes of the cover layer and the bottom layer coincide;

[0037] Preferably, in the convex-convex structure, the light-emitting diodes are evenly mounted on the grid-shaped support frame, and the number of the light-emitting diodes is ≥4;

[0038] The bottom layer is a plastic film with an aluminum reflective layer, and the material reflectivity is ≥ 60%; the inner surface of the bottom layer is provided with a micro-convex or micro-concave scattering structure;

[0039] Under the condition that the pressure difference between the homogenizing cavity and the environment is greater than zero and less than the rupture threshold of the thin film material, the shape of the covering layer and the convex shape of the bottom layer are off-axis rotational paraboloids; the axis of the covering layer coincides with the parabola-like axis of the bottom layer.

[0040] Preferably, N of the LED package devices are assembled into a large-area phototherapy device using flexible connectors, and N≥4.

[0041] Preferably, the LED packaging device further comprises a photoelectric control module, a communication module, a security management module and a solid-state memory;

[0042] The photoelectric control module includes a signal acquisition and processing circuit, a microprocessor and software; each subsystem is operated by manual control or voice control and semantic recognition software; the operation method is prompted by a voice chip, including issuing a safety warning;

[0043] The communication module receives remote control instructions issued by an external control device or uploads data luminous state parameters, monitoring signals, etc. of the device by wireless communication;

[0044] The safety management module uses a tactile sensor and a micro switch to ensure that the LED package device is in close contact with the user's skin before the light emitting diode driving power is turned on;

[0045] The solid-state memory records the power-on time and photoelectric operating parameters, providing a basis for tracing back previous exposure doses.

[0046] Based on a general inventive concept, the present invention also provides a method for using an LED package device with a light-homogenizing cavity, wherein the LED package device with a light-homogenizing cavity is used to deliver light energy to a user's skin area to be irradiated under the premise of strictly controlling the light dose.

[0047] The light dose is equal to the product of the radiation source intensity of the ultraviolet LED package device and the radiation exposure time; the light source generates one or more wavelengths within a bandwidth of 293-310 nm.

[0048] The ultraviolet LED package device is used to project light energy to the user's skin area to be irradiated, and a certain dose of light produces an immunomodulatory effect, which is used to assist in the treatment of non-skin autoimmune diseases; the light energy produces hormones or peptides, including adrenocorticotropic hormone, melanocyte stimulating hormone, or beta-endorphin; or, produces at least one cis-uronic acid or DNA pyrimidine dimer;

[0049] The light dose is equal to the product of the radiation source intensity of the UV LED package device and the radiation exposure time; the light source produces one or more wavelengths within a narrower 293-310 nm bandwidth; the irradiated area is 1%-30% of the total skin area of ​​the user;

[0050] Ultraviolet erythema refers specifically to a skin erythema reaction induced by medium-wave ultraviolet radiation (UVB). Minimal Malerythemal Dose (MED) refers to the ultraviolet exposure time or dose required to produce the weakest erythema visible to the naked eye. This measurement helps to understand the sensitivity of a specific individual's skin to the ultraviolet dose received.

[0051] The safety management measures of the present invention include: determining the skin type of the user, and providing the user with a light dose that meets the photobiological safety specification through a light emitting diode driving current controller when the ultraviolet LED package device is close to the skin; the safety management module sets the upper limit of the projection dose for a specific user to be less than 1 unit of Minimal Malerythemal Dose (MED) based on the skin type measurement result;

[0052] The light emitting element generates narrow-band UVB radiation, which irradiates the skin to produce vitamin D precursor; the wavelength of light emitted by the light emitting element is 293-310 nm; the light dose of the narrow-band UVB irradiating the skin is 1-50 mJ / cm 2 The skin area irradiated by the UV LED package device is 1% to 80% of the human body surface area.

[0053] Materials for manufacturing UV LED packaging devices:

[0054] UV-transmitting materials refer to quartz, polydimethylsiloxane (abbreviated as PDMS), polytetrafluoroethylene (transmitting type) and other fluorinated polymers;

[0055] UV reflective materials refer to metal aluminum and polytetrafluoroethylene (reflective type);

[0056] Materials with UV transmission / reflection splitting ratio ≤ 1 / 2, including polytetrafluoroethylene (transmission / reflection type) and optical film materials; Polyethylene (PE) film: In the (200-300) nm range, the transmittance of 30µm PE film is generally less than 20%, except at 274, 208, 232 and 292 nm, with peaks at 274 and 292 nm of 70% and 100% respectively.

[0057] Other fluorinated polymers include fluorinated ethylene-propylene (EFEP), fluorinated ethylene-propylene (FEP), perfluoroalkoxy (PFA), tetrafluoroethylene-hexafluoropropylene vinylidene fluoride (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene (ETFE), etc.

[0058] The beneficial effects of the present invention are as follows:

[0059] One of the technical advances of the present invention is that the covering layer is made of plastic film and the pneumatic optical element produces a uniform light effect on the LED light beam. In contrast, the covering layer of the conventional device is made of silicone, which is thick and heavy, and there is no room for further reducing the weight of the device.

[0060] (1) The LED packaging device provided by the present invention uses a plastic film to replace the silicone structure in the traditional device, resulting in a reduction in the weight of the entire device and an increase in user comfort.

[0061] Compared with conventional devices of the same area, the new device is half as thick and one-third as heavy. The convex cover layer forms a body-adapting contact with the skin, which improves the comfort of wearing the device.

[0062] (2) The concave homogenizing cavity increases the effective irradiation area of ​​the whole device, which means that the power density of the light spot is reduced and the safety is increased.

[0063] The concave light homogenization cavity expands the effective irradiation area of ​​a single LED. Compared with a single LED element in a traditional device, the effective irradiation area of ​​a single tube in the new device is 10 times that of the traditional device. This means that the power density is reduced to 1 / 10 (below the safety limit).

[0064] Furthermore, the concave structure forms an air gap between the LED and the skin, eliminating the possibility of the LED element shining close to the skin and reducing the risk of UV radiation damaging DNA. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] The following drawings explain the main points of the technical solution of the present invention. The components in the schematic diagrams are not necessarily drawn to scale.

[0066] Figure 1 This is a schematic diagram of the structure of the LED packaging device in Example 1; Figure 1 (a) The pressure difference between the homogenizing cavity and the atmosphere is zero, and the cover layer 1 is in a relaxed state; Figure 1 (b) The pressure difference between the homogenizing cavity and the atmosphere is less than zero, and the cover layer 1 is in a tight state;

[0067] Figure 2 Schematic diagram of the structure of the pneumatic concave-flat optical element in Example 2;

[0068] in, Figure 2 (a) is a top view of the overall structure of the LED packaging device; Figure 2 (b) is a cross-sectional view along the BB direction; Figure 2 (c) is a cross-sectional view along CC direction;

[0069] Figure 3 Schematic diagram of the light reflection path near the reflection surface of the concave-flat optical element in Example 2 and the off-axis parabola mathematical curve in the rectangular coordinate system; Figure 3 (a) is a schematic diagram of the reflection path of light in the device, and the covering plastic film 11 is an off-axis rotating parabola; Figure 3 (b) is the mathematical curve of the off-axis parabola in the rectangular coordinate system;

[0070] Figure 4 The numerical simulation results of the LED light beam propagation process in the pneumatic concave-plane homogenizing cavity in Example 2; Figure 4 (a) is the LED light tracing diagram in the light-homogenizing cavity, where a single LED 4 is installed at the center of the bottom layer 3;

[0071] Figure 4 (b) is the numerical simulation result of the two-dimensional light intensity distribution of the cover layer output window (grayscale image). Figure 4 (c) is the numerical simulation result of the two-dimensional light intensity distribution of the output window of the cover layer (contour map);

[0072] Figure 5 Schematic diagram of the structure of the LED packaging device with convex-convex surface in Example 3; Figure 5 (a) is a three-dimensional schematic diagram of a convex-convex light homogenizing cavity; Figure 5 (b) The homogenizing cavity is in the inflated state; Figure 5 (c) The pressure difference between the homogenizing cavity and the atmosphere is zero, and the plastic films on both sides are in a relaxed state;

[0073] Figure 6 Schematic diagram of the position of the LED array in the convex-convex light homogenizing cavity in Example 3; Figure 6 (a) is a schematic diagram of LED light emitting diode 4 mounted on grid 21, Figure 6 (b) is a schematic diagram of the light propagation path in the biconvex cavity;

[0074] Figure 7 The three-dimensional structure of the concave-flat optical element in Example 4 (parts exploded diagram), 4 LED elements are mounted on the inner wall of the support 2;

[0075] Figure 8 The plastic film of the covering layer (1) in Example 4 is compared before and after deformation: Figure 8(a) indicates that the atmospheric pressure difference is zero and the covering plastic film 11 is in a relaxed state. Figure 8 (b) shows that atmospheric pressure causes the cover layer (1) to be concave inward, while the shape of the bottom layer remains approximately unchanged, forming a concave-flat optical element;

[0076] Figure 8 (c) along Figure 8 (b) Cross-sectional view along the BB direction, with eight LED components mounted on the inner wall of the support;

[0077] Fig. 9 is a schematic diagram of the reflection and propagation of light in the light homogenizing cavity along multiple paths in Example 4, Fig. 9 (a) is a schematic diagram of light propagation in the cross section of the support 2 (further explanation Figure 8 (c) details), Fig. 9 (b) along Fig. 9 (a) CC cross-sectional view, Fig. 9 (c) is a cross-sectional view along the DD direction;

[0078] Fig.10 The three-dimensional structure of the concave-concave optical element in Example 5 (parts exploded diagram), the LED element is mounted on the inner wall of the support;

[0079] Fig.11 Compare the two plastic films of the cover layer (1) and the bottom layer (3) before and after deformation: Fig.11 (a) indicates that the atmospheric pressure difference is zero, and the two plastic films of the cover layer and the bottom layer are in a relaxed state.

[0080] Fig.11 (b) shows that atmospheric pressure causes the cover layer and the bottom layer to be concave inward, forming a double concave optical element.

[0081] Fig.11 (c) along Fig.11 (b) Cross-sectional view along the BB direction, with eight LED components mounted on the inner wall of the support;

[0082] Fig.12 is a schematic diagram of a large-area phototherapy device in Example 6, Fig.12 (a) is a schematic diagram of a phototherapy device (6) and an air pressure regulating device (5) suitable for irradiating the back of a human body. Fig.12 (b) Fig.12 (a) AA cross-section of the LED package device; in the schematic diagram of the concave-flat light homogenizing cavity, two LED components and two concave plastic film optical components are shown.

[0083] Description of the accompanying drawings:

[0084] 1-covering layer; 11-plastic film part;

[0085] 2-support member; 21-grid-shaped support frame;

[0086] 3-bottom layer; 32-zigzag microstructure;

[0087] 4-light emitting diode; 40-LED light; 41-transmitted light; 42-reflected light; 43-secondary transmitted light; 44-secondary reflected light;

[0088] 5-air pressure regulating device; 51-air guide joint; 52-air guide tube; 53-micro air pump; 54-air pressure sensor; 55-air pressure control module;

[0089] 6- Phototherapy equipment;

[0090] 7- Skin.

[0091] The above drawings briefly introduce the main points of the present invention. Obviously, the drawings are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative work. DETAILED DESCRIPTION

[0092] Example 1: Concave optical element made of plastic film

[0093] The present invention uses a light plastic film to manufacture an LED packaging device, replacing the heavy optical glass or / and silicone body in a traditional phototherapy device, resulting in a lighter weight of the entire device. Specifically, the present invention applies atmospheric pressure to the light plastic film to deform it, thereby forming a pneumatic concave (or / and convex) optical element with a light-homogenizing effect.

[0094] 1. Structure of the airtight light homogenizing cavity and air pressure controller

[0095] like Figure 1 As shown, the LED package device includes six basic components: a cover layer 1, a support member 2, a bottom layer 3, a light emitting diode 4, an air pressure regulating device 5, and a control circuit. The support member 2 is a circular ring or a square frame. In this embodiment, the support member 2 is preferably a circular ring, and the light hole is circular. The cover layer 1 and the bottom layer 3 are respectively connected airtightly on both sides to form a concave-plane uniform light cavity, and the cavity is a closed air gap.

[0096] The cover layer 1 is made of a thin layer of plastic, and the plastic film component 11 is made of a material with a transmission / reflection splitting ratio of ≤1 / 2. Specifically, the material with a transmission / reflection splitting ratio of ≤1 / 2 refers to a fluorinated polymer or a polydimethylsiloxane material. In this embodiment, the cover layer 1 is preferably made of polytetrafluoroethylene. In other embodiments, the cover layer 1 can also be made of other fluorinated polymers including: fluorinated ethylene-propylene (EFEP), fluorinated ethylene-propylene (FEP), perfluoroalkoxy (PFA), tetrafluoroethylene-hexafluoropropylene vinylidene fluoride (THV), polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene (ETFE) and other materials. The inner surface reflectivity of the cover layer 1 is ≥60%. The cover layer 1 is both the reflection surface of the light homogenizing cavity and the light output window of the LED packaging device.

[0097] The bottom layer 3 is a hard thin plate, and the inner surface of the bottom layer 3 is covered with an aluminum reflective layer, and the inner surface reflectivity of the bottom layer 3 is ≥ the inner surface reflectivity of the covering layer 1; specifically, in this embodiment, the inner surface reflectivity of the covering layer 1 is ≥60%, and its transmittance is ≤20%. The support member 2 is made of a hard material. In this embodiment, the hard material is preferably engineering plastic. Under load, the engineering plastic has a strong ability to resist deformation and is not easy to deform. The thickness is not less than 1 mm, and the reflectivity of the inner surface is ≥60%.

[0098] The air pressure regulating device 5 is connected to the homogenizing cavity and is used to increase or decrease, or maintain the air pressure of the airtight air gap in the homogenizing cavity. When the pressure difference between the homogenizing cavity and the environment is zero, the cover layer and the bottom layer are in a relaxed state; Figure 1 (a). When the pressure difference between the homogenizing cavity and the environment is less than zero, Figure 1 In (b), atmospheric pressure causes the plastic film to deform and tighten, and the plastic film product 11 becomes a concave optical element. The plastic film product of the cover layer 1 after tightening is shaped like an off-axis rotating parabola, and the two sides of the homogenizing cavity form a concave-plane structure.

[0099] Specifically, the air pressure regulating device 5 includes an air guide joint 51, an air guide tube 52, and a micro air pump 53. The air guide joint 51 is arranged on the outside of the support 1 and is connected to the light homogenizing cavity. The micro air pump 53 is connected to the air guide joint 51 through the air guide tube 52. Preferably, a valve is arranged on the air guide tube 52, and the valve switch is used to control whether the light homogenizing cavity and the micro air pump are connected. The air pressure regulating device 5 also includes an air pressure sensor 54 and an air pressure control module 55. The air pressure sensor 54 is arranged in the light homogenizing cavity to monitor the pressure difference between the light homogenizing cavity and the external environment. Specifically, the air pressure sensor 54 can be arranged on the inner surface of the support 2 or the bottom layer 3, preferably on the inner surface of the support 2. The air pressure control module 55 is electrically connected to the air pressure sensor 54 and the micro air pump 53 respectively. The air pressure control module 55 controls the micro air pump 53 to start or stop air extraction according to the monitoring result of the air pressure sensor 54, so as to maintain the air pressure in the light homogenizing cavity at a preset value.

[0100] See also Figure 2 and Figure 4 (a), the light emitting diode 4 is installed at the center of the bottom layer 3, and the light of the light emitting diode 4 is propagated along multi-path reflection and diffuse reflection in the light homogenizing cavity, producing a light homogenizing effect, and generating a light spot with a light intensity approximately uniformly distributed on the outside of the cover layer 1; the concave (or convex) surface of the light homogenizing cavity expands the effective irradiation area of ​​the light spot (the actual irradiation area is larger than the cross-sectional area of ​​the transmitted light beam of a single light emitting diode 4 directly irradiating the cover layer 1).

[0101] In this embodiment, the pressure sensor 54 is used to monitor the pressure difference between the light homogenizing cavity and the atmosphere; the shape of the concave side of the light homogenizing cavity is indirectly monitored through the pressure difference, and the shape parameter is a quantitative basis for the optical performance of the air pressure type optical element made of a thin layer of plastic. The air pressure control module 55 controls and adjusts or stabilizes the pressure difference; under normal air pressure conditions, the driving power supply of the light emitting diode 4 is turned on; when the air pressure is abnormal or the operating state is abnormal, the driving power supply of the light emitting diode 4 is cut off.

[0102] (ii) Using the air pressure difference driving principle to strengthen the concave plastic film structure

[0103] The core content of the present invention is to use the concave (or convex) plastic film member of the cover layer 1 as a reflection / transmission surface to form a pneumatic optical element, which has a uniform light effect on the LED light beam.

[0104] However, for conventional, solid optical components, without reinforcement measures, the concave plastic film of the cover layer 1 has the potential disadvantage of being unstable in shape. For this reason, common practical optical components avoid using flexible plastic films (the optical instrument industry tends to use hard materials to make reflective / transmissive optical components).

[0105] In view of the shortcoming of "unstable shape of flexible film devices", the present invention designs the concave plastic film parts into pneumatic components, which has the beneficial effect of not only reducing the weight of the whole machine by using the plastic film parts, but also eliminating the shortcoming of unstable shape of the flexible film.

[0106] The pneumatic component operates as follows:

[0107] When the phototherapy device is turned on, the air pressure control module 55 controls the micro air pump 53 to start air extraction. At this time, the pressure in the sealed light homogenizing cavity drops, and the atmospheric pressure tightens the plastic film of the cover layer 1. The atmospheric pressure difference produces the actual effect of "configuration reinforcement", so that the tightening of the cover layer 1 forms a stable off-axis rotating parabola shape (such as Figure 1 (b) and Figure 3 (a) shows), so that the light uniformity effect of the concave plastic film of the covering layer 1 is no different from that of the hard optical lens.

[0108] (iii) The concave plastic film of the present invention has a stable configuration.

[0109] Figure 1 In (b), when the pressure difference between the homogenizing cavity and the environment is less than zero, the negative pressure difference is defined as:

[0110] (P 匀光腔 -P 大气 ) < 0 ,

[0111] Where, atmospheric pressure is P 大气 , the absolute pressure of the homogenizing cavity is P 匀光腔 .

[0112] Stress analysis of plastic film , the calculation method is as follows:

[0113] Known condition 1: 1 atmospheric pressure P 大气 ≌ 1.03325 kgf / cm 2 (Unit: kgf / cm 2 );

[0114] Known condition 2: Figure 1 The area S of the cover layer 1 塑料膜 ≌ 100 cm 2 ;

[0115] A small amount of air is extracted from the homogenizing cavity, and the pressure difference between the atmosphere and the homogenizing cavity is about 1 / 100 of the atmospheric pressure. That is,

[0116] Pressure difference: (P 大气 -P 匀光腔 ) / P 大气 ≌ 1 / 100,

[0117] Air pressure F: F 气压力 =(P 大气 -P 匀光腔 ) * S 塑料膜 ≌ 1 kgf. (Formula 1)

[0118] Force calculation results: The atmospheric pressure on the plastic film of the cover layer 1 is about 1 kgf (engineering kilogram force).

[0119] On the one hand, this pressure is sufficient to drive the plastic film of the cover layer 1 into a conical concave surface (such as Figure 1 (b) Figure 2 On the other hand, the force area S 塑料膜 The output film can withstand a pressure of 1kgf (engineering kilogram force) without causing the material to break. The area of ​​the plastic film of the cover layer 1 can be selected in different sizes according to actual conditions. Even if the area of ​​the plastic film of the cover layer 1 is increased to 1000 cm 2 The above can still better withstand the atmospheric pressure caused by the pressure difference.

[0120] Repeatability of the plastic film shape of this device :

[0121] Operating condition 1: Temperature is one of the factors that affect the stability of the device, but the range of variation is not large. For example, the average value of the thermometer clamped in the armpit and read after 10 minutes is 36~37℃. It can be inferred that during the phototherapy process, the operating temperature of the device varies by about 1℃.

[0122] Operation condition 2: Each treatment lasts no longer than 30 minutes.

[0123] The design goal of the present invention is to keep the plastic film of the cover layer 1 at its concave size. The curvature radius of the concave plastic film is defined as a spherical surface with a radius r, and our design index is to keep the curvature radius 1 / r constant.

[0124] According to the Young–Laplace law, the law of the change of the spherical shape of the balloon is:

[0125] , (Formula 2)

[0126] The rule expressed by Formula 2 is that the radius of curvature r of the concave surface is inversely proportional to the pressure difference ΔP and is directly proportional to the tension coefficient of the plastic material.

[0127] In this embodiment, the plastic film of the covering layer 1 is a polytetrafluoroethylene film. Under the condition that the human body temperature remains stable within 30 minutes, the tension coefficient σ (r) of the plastic is approximately equal to a constant.

[0128] The device uses a pressure sensor 54 to monitor the pressure P of the light homogenizing cavity.匀光腔 The pressure value is controlled by a micro air pump 53, so that P 匀光腔 Maintain a stable value; thus making the concave curvature 1 / r approximately constant.

[0129] In summary, at pressure P 匀光腔 While maintaining a constant background, the shape of the concave surface of the plastic film of the cover layer 1 of the present invention is repeatable and has good optical reflection / transmission performance in the light homogenizing cavity.

[0130] The atmospheric pressure is limited to causing a repeatable change in the shape of the plastic film, but will not cause the diaphragm to rupture, making the pneumatic component safe for operation.

[0131] Example 2 Concave-plane homogenization structure, single LED located at the center of the bottom layer

[0132] Figure 2 The schematic diagram of the structure of an LED package device is shown in FIG. The technical feature is that the geometric profile of the core component cover layer 1 is an off-axis rotation parabola, and the light-emitting diode 4 is installed at the center of the bottom plane.

[0133] The middle of the support 2 is a circular light-through hole, and the cover layer 1 is pasted on one side close to the skin 7, and the bottom layer 3 is pasted on the other side;

[0134] The support member 2 is an engineering plastic member (strong in resistance to deformation under load and not easily deformed), with a thickness of not less than 1 mm and an inner surface reflectivity of ≥ 60%; or a member made of quartz or polydimethylsiloxane material with a transmittance of ≥ 60%. The support member 2 is provided with an air guide joint 51;

[0135] The bottom layer 3 is a plastic or metal sheet with an aluminum reflective layer, the thickness of which is not less than 1 mm, the inner surface of the bottom layer is approximately flat, and the reflectivity is ≥ 60%; Figure 2 In the cross-sectional views BB and CC, the thin plate material of the bottom layer 3 has a square shape, but only the central circular light-through hole area has a reflective effect on light.

[0136] Under the condition that the pressure difference between the homogenizing cavity and the environment is less than zero, the concave plastic film of the cover layer 1 is in the shape of an off-axis rotation parabola, such as Figure 3 (a) The cover layer 1, the bottom layer 3 and the inner wall of the support 2 form a concave-plane structure with a light-homogenizing function; in the rectangular coordinate system, the cross section of the cover layer 1 is Figure 3 (b) shows the off-axis parabola. That is, the geometric shape of the plastic film of the cover layer 1 is Parabola equation in coordinate system, y 2 =2px, (p > 0),

[0137] The coordinates of the vertex of the parabola are: x = - p / 2, y = 0. Coordinate system relative to laboratory Coordinate system, the deflection angle is φ.

[0138] The following is a brief description of the propagation mode of LED light in the homogenizing cavity:

[0139] The LED light tracing diagram in the homogenizing cavity is shown below: Figure 4 As shown in (a), the top radius of the parabola is 1 cm, the focal length is 0.025 cm, the distance between the light-emitting diode 4 and the top of the parabola is 0.06 cm, the light-emitting surface of the light-emitting diode 4 is 0.048 cm*0.048 cm, the power is 0.001 W, and the beam divergence angle is 120°.

[0140] like Figure 4 As shown in (a), the LED element emits light at the center of the bottom layer, and a part of the light reaches the cover layer 1 and is divided into two parts: transmission and reflection. Among them, the reflected light is reflected along multiple paths or diffusely reflected between the cover layer 1, the bottom layer 3 and the support 2. When the other part of the light reaches the cover layer 1 again, it is divided into two parts again: transmission and reflection. Outside the cover layer 1, multiple beams of transmitted light are incoherently superimposed to produce a light spot with a nearly uniform light intensity distribution.

[0141] Figure 4 (b) and (c) are two-dimensional light intensity distribution diagrams of the output window of the cover layer 1. The numerical simulation results show that the illumination effect of a single LED is:

[0142] The diameter of the effective illumination range is about 11 cm. The optical power at 5.5 cm from the center is 3 microwatts / cm 2 In the figure, the maximum LED power is 11.9 microwatts / cm 2 .

[0143] Example 3 In the inflated state, the homogenizing cavity has a convex-convex structure

[0144] Under the pressure of the gas in the cavity, the cover layer and the bottom layer bulge outward at the same time, forming a three-dimensional structure of the double-convex phototherapy device as shown in FIG. Figure 5 The main difference from Example 2 is that: the properties of the bottom layer material are different, the bottom layer 3 is a plastic film with an aluminum reflective layer, and the material reflectivity is ≥ 60%; the surface of the aluminum reflective layer is processed with a microstructure with scattering properties, specifically a micro-convex or micro-concave scattering structure;

[0145] The optical output surface (covering layer 1) and the reflective surface (bottom layer 3) are parabolic / spherical surfaces modified by the "evening effect"; their performance characteristics are:

[0146] In the non-operating state, the plastic film on both sides of the device is in a relaxed state (such as Figure 5(c) shows that it has a flat shape, small thickness and light weight;

[0147] In the positive pressure differential state, the two surfaces are convex (such as Figure 5 (a), 5 (b), the LED emits light 40 directed to the reflective surface of the bottom layer 3; then, the corresponding transmitted light 42 irradiates the skin 7 through the cover layer 1;

[0148] The phototherapy effective irradiation area of ​​this device is large; it is suitable for phototherapy of the back of the human body.

[0149] The support member 2 is a light-weight flat plate, and the opening area of ​​the circular light-through hole on the support member 2 is the effective output area; an optical output film (for example, a prefabricated fluorine-containing polymer film, or a polydimethylsiloxane film) is bonded to the right side of the circular light-through hole; and a plastic film with a reflective layer (for example, a micro-convex and concave scattering structure is provided on an aluminum-plated plastic film) is bonded to the left side; the operation mode is as follows:

[0150] In the zero pressure difference state, the optical output layer and the reflective layer are both plastic films in a relaxed state; Figure 5 (c) shown.

[0151] Use a micro air pump 53 to inflate the light homogenizing cavity through the air guide joint 51 and the air guide tube 52 to generate a positive air pressure difference, forming a "double convex" light homogenizing device; Figure 5 (a) and 5 (b).

[0152] Figure 6 In the figure, a circular light hole (or a square light hole with arc-shaped corners) is provided in a rectangular (or square with arc-shaped chamfered) support member 2. A grid-shaped support frame 21 is installed in the hole. The grid-shaped support frame 21 is made of a transparent material. A plurality of (six in this example) light-emitting diodes 4 are installed on the grid-shaped support frame 21 to form an LED array.

[0153] In the light homogenizing device, the light emitted by the light emitting diode 4 is reflected (diffusely reflected) and transmitted along multiple paths; for example, a representative path for propagation of a portion of the light is: LED light 40 → reflected light 42 → transmitted light 41 → reaches the skin 7; a representative path for propagation of a portion of the reflected light (41) through multipath reflection in the cavity is: LED reflected light 44 → reflected light ... → transmitted light 41 → reaches the skin 7; Figure 6 (b) shown.

[0154] exist Figure 6 In (b), the LED initial light (40) is directed toward the bottom layer on the right side. In other words, the LED initial light is not directly directed toward the cover layer (1) on the left side. Therefore, there is no light path for the initial light to directly reach the skin (7) in the device.

[0155] Example 4 Concave-plane uniform light structure, LED is installed on the inner wall of the annular support

[0156] The three-dimensional structure of LED packaging devices is as follows Figure 7 As shown, the main structure is the same as the LED package device structure in Example 1, and the main difference is that: when the pressure difference between the uniform light cavity and the external environment is less than zero, the concave plastic film of the cover layer 1 is a cone-like shape, and the 8 light-emitting diodes 4 are evenly arranged on the inner wall of the support 2, and the light beams of the light-emitting diodes 4 do not directly irradiate the skin 7 (such as Figure 8 , Fig. 9 At the same time, the inner surface of the aluminum reflective layer of the bottom layer 3 is provided with a sawtooth microstructure 32.

[0157] The pressure difference is defined as the difference between the atmospheric pressure and the absolute pressure in the light homogenizing cavity (a negative value is taken when the air is evacuated; Example 1 provides an example of the design calculation of the atmospheric pressure).

[0158] Figure 8 The changes of the plastic film of the covering layer 1 before and after deformation are compared:

[0159] Status I : In the zero pressure difference state, the covering layer 1 is a plastic film in a relaxed state; Figure 8 (a) Cross-section of the light-homogenizing cavity;

[0160] Status II : The micro air pump 53 extracts air from the light homogenizing cavity, and the atmospheric pressure makes the cover layer 1 become a concave optical element;

[0161] The "concave" cover layer 1 and the flat bottom plate 3 form a "concave-flat" optical element, such as Figure 8 (b) as shown. Figure 8 (c) is a cross-sectional view of the light homogenizing cavity AA, where the air guide connector 51 is located on the support 2, see Figure 7 ;

[0162] * Note 1: The deformation of the bottom layer 3 caused by the pressure difference is very small, and the bottom layer 3 is approximated as a flat plate.

[0163] At least four light emitting diodes 4 are installed on the inner wall of the circular ring of the support member 2 to form an LED circular linear array; the main axis of the light beam of the light emitting diode 4 is perpendicular to the central axis of the circular ring; Figure 8 Preferably, eight light emitting diodes 4 are evenly arranged along the circumference of the inner wall of the support member 2 .

[0164] The present invention adopts the following four technical measures to improve the uniformity of the output light spot: Fig. 9 As shown:

[0165] Measure I : Use materials with "transmission / reflection splitting ratio ≤ 1 / 2" to generate a large amount of reflected light.

[0166] The covering layer 1 is made of a material with an adjustable transmission / reflection splitting ratio, so that the LED light is split into two parts on the surface of the covering layer 1; wherein the transmitted light 41 reaches the treatment object, and the reflected light 42 propagates in multiple paths in the wedge-shaped medium.

[0167] * Note 2: For example, in this embodiment, the beam splitting ratio of the prefabricated polytetrafluoroethylene film is: partial transmittance ≤ 20%, partial reflectivity ≥ 60%.

[0168] Measure II : In the wedge-shaped air gap, light is reflected / diffusely reflected and transmitted along multiple paths, producing a uniform light effect.

[0169] Air is a low-loss propagation medium for ultraviolet light. Fig. 9 As shown in (b) and (c), a "wedge-shaped" air gap is formed between the cover layer 1 and the bottom layer 3. In the wedge-shaped medium, the LED light propagates along a typical Z-shaped path. The LED light 40 is transmitted through the cover layer 1 to form a transmitted light 41, which directly reaches the skin 7; the reflected light 42 continues to propagate along the Z-shaped path in the homogenizing cavity, and then forms a secondary transmitted light 43.

[0170] The sawtooth microstructure 32 disposed on the surface of the bottom layer 3 produces a further light homogenization effect.

[0171] * Note 3: The multipath reflection / transmission process in the wedge-shaped air gap of the present invention can be compared to the multipath reflection / transmission process in a solid gap (wedge-shaped quartz light guide plate).

[0172] Measure III : The deformation of the output layer (plastic film component 11) under air pressure is simulated and the "uniform light effect" is corrected by using a ray tracing method; in this embodiment, when the cover layer 1 is stretched tight, a conical concave surface or a square pyramid concave surface (mathematically corrected surface) is formed.

[0173] Measure IV : By changing the driving current of the LED matrix rows and columns, the uniformity of the light emission of the light emitting diode 4 array rows and columns is fine-tuned, and a light spot with a light intensity approximately uniformly distributed is formed near the skin 7.

[0174] The phototherapy device provided in this embodiment has a flat appearance, a small thickness (in a negative pressure difference state, the surface is concave), a large effective irradiation area, and a light weight; it is suitable for phototherapy of the human back.

[0175] Example 5 Concave-concave light homogenization structure, LED is installed on the inner wall of the ring support

[0176] The three-dimensional structure of the double concave LED packaging device of this embodiment is as follows Fig.10As shown, the main difference from the concave-plane structure of Example 4 is that: the properties of the bottom layer 3 are different. The bottom layer 3 is a plastic film with an aluminum reflective layer, and the material reflectivity is ≥60%; the surface of the aluminum reflective layer is processed with a microstructure with scattering properties, specifically a micro-convex or micro-concave scattering structure; under the condition that the pressure difference between the homogenizing cavity and the environment is less than zero, the shapes of the cover layer 1 and the bottom layer 3 are both inwardly concave off-axis rotation paraboloids.

[0177] The cover layer 1 is a prefabricated fluorine-containing polymer film, and in other embodiments it may also be a polydimethylsiloxane film; the bottom layer 3 is a plastic film with an aluminum reflective layer, and a micro-convex or micro-concave scattering structure is arranged on the aluminum reflective layer.

[0178] Fig.11 The changes of the homogenizing cavity structure before and after deformation of the plastic film of the cover layer 1 and the plastic film of the bottom layer 3 are compared;

[0179] In the zero pressure difference state, the cover layer 1 and the bottom layer 3 are both plastic films in a relaxed state, such as Fig.11 (a) as shown;

[0180] In the negative pressure difference state, the ambient atmospheric pressure causes the plastic films of the cover layer 1 and the bottom layer 3 to be concave, forming two off-axis rotation paraboloids.

[0181] Fig.11 (b) Cross-sectional view of the homogenizing cavity AA; the pressure difference between the homogenizing cavity and the atmosphere is less than zero. The atmospheric pressure deforms the plastic film, and the cover layer and the bottom layer become double concave optical elements.

[0182] Compared with Embodiment 2 and Embodiment 4, the biconcave plastic film of this embodiment minimizes the total weight of the light homogenizing structure. The light homogenizing cavity has a stronger light homogenizing function, generating a light spot with a light intensity approximately uniformly distributed outside the cover layer 1 .

[0183] Example 6: Operating a phototherapy device in close proximity to the human body

[0184] Medical research results show that the larger the irradiation area of ​​ultraviolet light therapy, the better the effect of inducing the synthesis of vitamin D precursors in the skin. At the same time, the ultraviolet dose required to produce photochemical reactions is reduced, and the probability of ultraviolet radiation damaging DNA decreases accordingly.

[0185] The present invention uses a flexible connector to assemble N LED package components into a large-area phototherapy device 6, where N ≥ 4; Fig.12 As shown, the back-specific phototherapy device provided by the present invention can cover about 9% of the area of ​​human skin.

[0186] When used close to the back of the human body, the negative pressure difference causes the cover layer 1 to have a concave surface, forming a ventilation and perspiration interval between the skin, which can improve the user's physical comfort.

[0187] A light ring is used as the support 2, and the light hole area of ​​the support 2 is the effective treatment area; the air guide connector 51 provided on the support 2 is connected to the micro air pump 53. The connection sequence of the air path is: the airtight space of the homogenizing cavity → the air guide connector 51 → the air guide tube 52 → the micro air pump 53.

[0188] The air pressure control module 55 is electrically connected to the micro air pump 53; the air pressure sensor 54 is used to monitor the pressure difference between the light homogenizing cavity and the atmosphere; the air pressure control module 55 controls, adjusts or stabilizes the pressure difference;

[0189] The shape change of the concave side of the homogenizing cavity is inferred through the indirect measurement of the pressure difference. This shape change parameter is the quantitative basis for evaluating the optical performance of the plastic film optical element. When the air pressure is normal, the LED driving power supply is turned on; when the air pressure is abnormal or the operating state is abnormal, the LED driving power supply is cut off.

[0190] Fig.12 (b) is an AA cross-sectional view of the LED package device; in the concave-plane homogenizing cavity schematic, two LED components and two concave plastic film optical components are shown. When the phototherapy device is turned on, the micro vacuum pump 53 pumps air to generate a negative pressure difference in the homogenizing cavity, causing the cover layer 1 (or the bottom layer 3) of the homogenizing cavity to "deform" and become a concave optical component. Between the cover layer 1 and the bottom layer 3, the light of the light emitting diode 4 propagates along the multi-path reflection, diffuse reflection / transmission light path, and produces the effect of homogenizing the spatial distribution of light intensity (see Figure 4 and Fig. 9 ).

[0191] Note: It is known to those skilled in the art that plastic film optical elements have the inherent disadvantage of "large aberration". "Aberration" means that the point spread function is deteriorated (i.e., the energy is dispersed into a larger spatial area), which is a harmful factor for imaging optical systems.

[0192] It should be pointed out that the phototherapy device is a non-imaging optical system, and the "light energy dispersion phenomenon" is not a disadvantage, but a favorable factor for improving the uniformity of the phototherapy spot.

[0193] The light homogenization measure adopted by the present invention is that the LED light is propagated along multi-path reflection and diffuse reflection in the light homogenization cavity, which produces a light homogenization effect on the output light spot, and the aberration enhances the "light homogenization" so that the light spot intensity distribution curve tends to be flat.

[0194] The present invention utilizes atmospheric pressure to "reinforce" the shape of plastic film optical elements.

[0195] Plastic film is soft and easily deformed, which is an inherent disadvantage of plastic film. In principle, it cannot be used as an independent optical element.

[0196] Installing the plastic film in the evacuated (or de-evacuated) state in the airtight cavity is one of the core technologies of the present invention, which effectively avoids the disadvantage of "the plastic film is easy to deform".

[0197] Specifically, the present invention uses atmospheric pressure to keep the plastic film in a taut state, which is equivalent to "solidifying" the shape of the plastic film. In the new light homogenizing cavity, the shape of the plastic film optical element has good repeatability, producing a good light homogenizing effect.

[0198] The present invention adopts the above-mentioned multiple measures to improve the uniformity of the output light spot, which produces the substantial effect of not only improving the efficiency of synthesizing vitamin D in the body, but also minimizing the dose of ultraviolet radiation projected into the body, thereby minimizing the probability of ultraviolet radiation damaging health.

[0199] Example 7 Method of using a phototherapy device

[0200] Ultraviolet light therapy has an auxiliary therapeutic effect on non-skin autoimmune diseases. The light energy produces hormones or peptides, including adrenocorticotropic hormone, melanocyte stimulating hormone, or beta-endorphin; or, produces at least one cis-uronic acid or DNA pyrimidine dimer; during the light therapy, the light dose provided to the user is determined by the controller, and the light dose is defined as the product of the ultraviolet radiation source intensity of the LED package device and the exposure time of the ultraviolet radiation source, and the light dose is ≤ ; The ultraviolet radiation source includes one or more target wavelengths within the bandwidth range of 280-320 nm.

[0201] The safety management measures of the present invention include: determining the skin type of the user, and providing the user with a light dose that meets the photobiological safety specification through a light emitting diode driving current controller when the ultraviolet LED package device is close to the skin; the safety management module sets the upper limit of the projection dose for a specific user to be less than 1 unit of Minimal Malerythemal Dose (MED) based on the skin type measurement result;

[0202] The ultraviolet erythema mentioned above refers specifically to a skin erythema reaction induced by medium-wave ultraviolet radiation (UVB). Minimum erythema dose (MED) refers to the ultraviolet exposure time or dose required to produce the weakest erythema visible to the naked eye. This measurement value helps to understand the sensitivity of a specific individual's skin to the ultraviolet dose received.

[0203] like Fig.12 As shown, the user's skin type is determined. When the LED package device is close to the user's skin, the light-emitting diode 4 generates narrow-band UVB radiation, which irradiates the skin to produce vitamin D precursors; the wavelength of the light-emitting diode 4 is 297 20nm; the light dose of narrow-band UVB irradiating the skin is ;The area of ​​skin irradiated by LED package devices is 1% to 80% of the human body surface area.

[0204] The embodiments described above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto; any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the technical scope of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An LED package device with a light homogenizing cavity, characterized in that: It comprises a covering layer (1), a supporting member (2), a bottom layer (3), a light emitting diode (4) and an air pressure regulating device (5); The support member (2) is provided with a circular light-through hole or a square light-through hole with a circular arc chamfer, and the two sides of the light-through hole of the support member (2) are respectively connected to the cover layer (1) and the bottom layer (3) in an airtight manner to form a light-homogenizing cavity, and the interior of the light-homogenizing cavity is a closed air gap; The light homogenizing cavity is in communication with the air pressure regulating device (5), and the air pressure regulating device (5) regulates the air pressure in the light homogenizing cavity to a preset value; The covering layer (1) is a plastic film, the inner surface reflectivity of the plastic film is ≥60%, and the covering layer (1) is both a reflective surface of the light homogenizing cavity and a light output window of the LED packaging device; The bottom layer (3) is a plastic film or a hard thin plate, the inner surface of the bottom layer (3) is covered with an aluminum reflective layer, the inner surface reflectivity is ≥ 60%, or it is provided with a sawtooth microstructure, or a microconvex or microconcave scattering structure; When the pressure difference between the light homogenizing cavity and the atmospheric environment is zero, the plastic film member is in a relaxed state; When the pressure difference between the homogenizing cavity and the atmospheric environment is less than zero, the atmospheric pressure causes the plastic film product to become concave, and the shape of the stretched plastic film product is an off-axis rotating parabola or a quasi-conical surface, resulting in a concave-plane structure or a concave-concave structure formed on both sides of the homogenizing cavity; When the pressure difference between the homogenizing cavity and the atmospheric environment is greater than zero, the gas pressure causes the plastic film product to become convex, and the shape of the stretched plastic film product is an off-axis rotating parabola or a quasi-conical surface, resulting in a convex-plane structure, a convex-conical structure, or a convex-convex structure on both sides of the homogenizing cavity; The light-emitting diode (4) is mounted in the middle of the bottom layer (3); or the light-emitting diode (4) is mounted on the inner wall of the light-through hole of the support member (2); or a grid-shaped support frame (21) is arranged in the light-through hole of the support member (2), the grid-shaped support frame (21) is made of a transparent material, and the light-emitting diode (4) is mounted on the grid-shaped support frame (21); The light emitted by the light emitting diode (4) is propagated along multi-path reflection and diffuse reflection in the light homogenizing cavity, thereby generating a light homogenizing effect and generating a light spot with a light power density approximately uniformly distributed outside the covering layer (1); the effective irradiation area of ​​the light spot is larger than the cross-sectional area of ​​a transmitted light beam directly irradiated by a single light emitting diode (4) on the covering layer (1).

2. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: The air pressure regulating device (5) comprises an air guide joint (51), an air guide tube (52), and a micro air pump (53); the air guide joint (51) is arranged on the support member (2) and is in communication with the light homogenizing cavity; the micro air pump (53) is in communication with the air guide joint (51) via the air guide tube (52).

3. The LED package device with a light homogenizing cavity according to claim 2, characterized in that: The air pressure regulating device (5) further comprises an air pressure sensor (54) and an air pressure control module (55), wherein the air pressure sensor (54) is used to monitor the pressure difference between the light homogenizing cavity and the atmospheric environment, and the air pressure control module (55) controls the micro air pump (53) to start air extraction, air filling or stop according to the monitoring result of the air pressure sensor (54), so as to maintain the air pressure in the light homogenizing cavity at a preset value.

4. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: The covering layer (1) is a film made of a fluorine-containing polymer or polydimethylsiloxane material; The support member (2) is made of a hard non-transparent material, has a thickness of not less than 1 mm, and a reflectivity of the inner surface of ≥ 60%; Alternatively, the support member (2) is made of quartz or polydimethylsiloxane material, and has a transmittance of ≥60%.

5. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: In the concave-plane structure, the light-emitting diode (4) is installed at the center of the bottom layer (3), and the bottom layer (3) is a plastic or metal sheet with an aluminum reflective layer, the thickness of which is not less than 1 mm, and the inner surface reflectivity is ≥ 60%; When the pressure difference between the light homogenizing cavity and the atmospheric environment is less than zero, the shape of the cover layer (1) is a concave off-axis rotation parabola, and the inner surface of the bottom layer (3) is approximately a plane.

6. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: In the concave-plane structure, the light-emitting diodes (4) are evenly mounted on the inner wall of the support (2), and the number of the light-emitting diodes (4) is ≥4; The bottom layer (3) is a plastic or metal sheet with an aluminum reflective layer, the thickness of which is not less than 1 mm, and the inner surface reflectivity is ≥ 60%; When the pressure difference between the light homogenizing cavity and the atmospheric environment is less than zero, the shape of the cover layer (1) is a quasi-conical surface; and the inner surface of the bottom layer (3) is provided with a sawtooth-shaped microstructure.

7. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: In the concave-concave structure, the light-emitting diodes (4) are evenly mounted on the inner wall of the support (2), and the number of the light-emitting diodes (4) is ≥4; The bottom layer (3) is a plastic film with an aluminum reflective layer, and the material reflectivity is ≥60%; the inner surface of the bottom layer (3) is provided with a micro-convex or micro-concave scattering structure; When the pressure difference between the light homogenizing cavity and the atmospheric environment is less than zero, the concave shapes of the cover layer (1) and the bottom layer (3) are both off-axis rotation paraboloids; the axis of the cover layer (1) coincides with the axis of the parabola of the bottom layer (3).

8. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: In the convex-convex structure, the light-emitting diodes (4) are evenly mounted on the grid-shaped support frame (21); The number of the light emitting diodes (4) is ≥4; Under the condition that the pressure difference between the homogenizing cavity and the atmospheric environment is greater than zero and less than the rupture threshold of the thin film material, the shape of the covering layer (1) and the convex shape of the bottom layer (3) are off-axis rotating paraboloids; the axis of the covering layer (1) coincides with the parabola-like axis of the bottom layer (3).

9. The LED package device with a light homogenizing cavity according to claim 1, characterized in that: N of the LED package devices are assembled into a large-area phototherapy device using flexible connectors, where N≥4.

10. A method for using the LED package device with a light homogenizing cavity as claimed in any one of claims 1 to 9 for non-disease treatment purposes, characterized in that: Under the premise of strictly controlling the light dose, the LED package device with the light homogenizing cavity is used to project light energy to the user's skin area to be irradiated. The light dose is equal to the product of the radiation source intensity of the ultraviolet LED package device and the radiation exposure time; the light source generates one or more wavelengths within the bandwidth of 293-310nm; the light dose irradiating the skin is 1-50mJ / cm 2 The LED package device with the uniform light cavity illuminates the user's skin in an area of ​​1% to 80% of the human body surface area.

Images