A circumferential zoned phototherapy device for acne lesion care

Abstract

The present application relates to the technical field of skin care phototherapy equipment, in particular to a circumferential partition phototherapy equipment for acne lesion care, which comprises a host computer, a phototherapy head, a multi-waveband light source assembly and a control assembly. The phototherapy head comprises a light beam adjusting cavity, a central light guide assembly, a circumferential light guide assembly and a lesion positioning assembly. The fixed central concave lens cooperates with the central convex lens driven by the heat-sensitive driving assembly to form an expanded light spot, and when the ambient temperature rises, the light beam cross-sectional area of the expanded light spot at the light entrance plane of the central light guide assembly is increased, and the light power density of the central light entrance area is reduced. The middle annular part of the expanded light spot directly enters the circumferential light guide assembly, and the outer part converges light inward through the annular convex lens located on the upstream side of the light entrance area; the central attenuation sheet attenuates the central part of the light beam, and the central avoidance cavity forms a non-contact space between the central light exit end face and the lesion center. The present application can take into account the central low irradiance irradiation, circumferential light supplement and lesion pressure avoidance.

Description

Technical Field

[0001] This invention relates to the field of phototherapy equipment for skin care, specifically a circumferential zoned phototherapy device for the care of acne lesions. Background Technology

[0002] Acne often manifests as skin lesions such as comedones, papules, pustules, nodules, and inflammatory redness and swelling. Different wavelengths of light, such as blue light, red light, yellow light, and near-infrared light, have been used in daily care and adjunctive treatment of acne.

[0003] Existing phototherapy devices for acne mostly irradiate the lesion and its surrounding area as a whole through a single light-emitting window or light source array, making it difficult to perform zoned control according to the different conditions of the lesion center and the surrounding area.

[0004] The center of acne lesions may be raised, red, swollen, broken, or sensitive, and should not be subjected to pressure or excessive irradiation; the surrounding area requires a certain range of circumferential irradiation. Reducing the overall light source power will simultaneously weaken the surrounding irradiation, and using light shields, light-blocking devices, or reducing the opening size can easily create shadows, dark areas, or ring-shaped gaps, affecting the continuity and uniformity of the circumferential light field.

[0005] In addition, continuous irradiation may cause a temperature rise near the central optical path. Existing equipment usually cannot adjust the central light spot and irradiance according to the temperature rise, so there is still room for improvement in user comfort. Summary of the Invention

[0006] The purpose of this invention is to provide a circumferential zoned phototherapy device for acne lesion care, so as to solve the problem that existing phototherapy devices are difficult to simultaneously avoid the center of the lesion and provide circumferential light to the surrounding area.

[0007] To achieve the above objectives, the present invention provides a circumferential zoned phototherapy device for acne lesion care, comprising a phototherapy head and a multi-band light source assembly. The phototherapy head includes a beam adjustment cavity, a central light guide assembly, and a circumferential light guide assembly. The multi-band light source assembly is disposed on one side of the beam adjustment cavity and outputs a collimated beam that propagates along the optical axis to the beam adjustment cavity. The beam adjustment cavity is provided with a central beam adjustment component, which includes a central concave lens, a central convex lens and a thermal drive component for adjusting the distance between the central concave lens and the central convex lens, and the collimated beam forms an extended beam through the central concave lens and the central convex lens; The circumferential light guide assembly has an annular light output area, and an annular convex lens with a central through hole is provided on its light input side. The extended light spot includes, from the inside to the outside, a central portion of the light beam, an intermediate annular portion of the light beam surrounding the central portion of the light beam, and an outer portion of the light beam surrounding the intermediate annular portion of the light beam. The central portion of the light beam enters the central light guide assembly, the intermediate annular portion of the light beam directly enters the circumferential light guide assembly through the central through hole, and the outer portion of the light beam converges inward through the annular convex lens and enters the circumferential light guide assembly, forming the annular light output area.

[0008] Optionally, the device further includes a host and a control component, the phototherapy head is connected to the host, and the multi-band light source component is electrically connected to the control component.

[0009] Optionally, the thermal drive assembly includes a first movable base, a shape memory alloy spring, and a return spring; the concave lens is fixedly disposed within the beam adjustment cavity, and the convex lens is disposed on the first movable base, which is movable along the optical axis; the beam adjustment cavity is provided with a first fixed support portion located on the side of the first movable base closer to the multi-band light source assembly and a second fixed support portion located on the side of the first movable base away from the multi-band light source assembly; the shape memory alloy spring abuts against the first fixed support portion and the first movable base, and the return spring abuts against the first movable base and the second fixed support portion; both the shape memory alloy spring and the return spring are located within the annular mounting space on the outer periphery of the concave lens and the convex lens, and a mutually cooperating limiting groove and limiting protrusion are provided between the first movable base and the beam adjustment cavity.

[0010] Optionally, the shape memory alloy spring is trained in shape memory and configured to elongate when its own temperature reaches a predetermined transition temperature, thereby pushing the first movable seat to move and increasing the distance between the concave lens and the convex lens. The focal length and initial spacing of the concave lens and the convex lens, the travel of the first movable seat, and the position of the incident plane of the central light guide assembly are configured such that the beam cross-sectional area of ​​the extended light spot at the incident plane increases with the increase of the distance between the concave lens and the convex lens, and the light power density received by the incident area of ​​the central light guide assembly decreases. When the elongation driving force of the shape memory alloy spring decreases to less than the elastic force of the return spring, the return spring pushes the first movable seat to reset.

[0011] Optionally, the circumferential light guide assembly further includes a circumferential light guide groove, an annular light guide cavity, and an annular scattering layer. The circumferential light guide groove includes a first annular light-incident region and a second annular light-incident region located outside it. The annular convex lens is located upstream of the circumferential light guide groove, and its central through-hole covers the light-incident region of the central light guide assembly and the first annular light-incident region in the optical axis projection. The lens body corresponds to the second annular light-incident region. The light beams received by the two light-incident regions form the annular light-out region through the annular light guide cavity and the annular scattering layer.

[0012] Optionally, the phototherapy head further includes a manual adjustment assembly for adjusting the axial position of the annular convex lens. The manual adjustment assembly includes a rotating adjustment ring, an outer cylinder, a spiral groove, an inner cylinder, a vertical groove, a second movable seat, and a pin. The spiral groove and the vertical groove are engaged by the pin so that when the rotating adjustment ring rotates, it drives the second movable seat and the annular convex lens to move axially.

[0013] Optionally, the central light guide assembly includes a central light guide channel, a central diffuser, and a central attenuator. The central attenuator has a predetermined transmittance within the operating wavelength range, and its effective light transmission area covers the maximum propagation range of the central portion of the light beam at the plane where the central attenuator is located.

[0014] Optionally, an inner light-shielding isolation wall is provided between the circumferential light guide groove and the central light guide component, and an outer light-shielding ring is provided on the outer side of the circumferential light guide groove.

[0015] Optionally, the phototherapy head further includes a lesion positioning component, which includes an annular positioning seat, a central clearance cavity, and an annular contact surface. The annular positioning seat is disposed at the skin contact end of the phototherapy head, and the annular contact surface is formed on the end face of the annular positioning seat facing the skin contact side and surrounds the central clearance cavity. The central light-emitting end face of the central light guide component is recessed 0.5 mm to 5 mm away from the skin contact side relative to the annular contact surface, and together with the inner peripheral wall of the annular positioning seat, defines the central clearance cavity with an inner diameter of 3 mm to 12 mm.

[0016] Optionally, the multi-band light source assembly includes multiple light source units, a mixing cavity, and a collimating output element. The multiple light source units correspond to different bands of blue light, yellow light, red light, and near-infrared light, and include at least two different bands of light source units. The light output from one or more of the light source units is mixed and / or homogenized by the mixing cavity, and then collimated by the collimating output element to form the collimated beam.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects: 1. The present invention uses the same multi-band light source to form an extended light spot covering the light-incident area of ​​the central light guide component, the circumferential light guide component and the annular convex lens, forming a central and circumferential partitioned light path within the same phototherapy head, reducing the light field differences caused by using independent light sources.

[0018] 2. The shape memory alloy spring responds to the ambient temperature rise in the beam adjustment cavity, causing the central convex lens to move relative to the fixed central concave lens, thereby increasing the beam cross-sectional area and reducing the light power density at the light incident plane of the central light guide component, thus passively weakening the central irradiation when the predetermined temperature rise is reached.

[0019] 3. When the irradiance of the central light-emitting area decreases, the light beam in the middle ring section still enters the circumferential light guide component directly, and the light beam in the outer section is converged and supplemented by the ring convex lens, thus maintaining the circumferential irradiation around the skin lesion.

[0020] 4. The annular convex lens is located upstream of the light-incident area of ​​the circumferential light guide assembly. Its central through-hole covers the central light guide and the circumferential direct light-incident area in the optical axis projection, allowing the light beams in the central part and the middle annular part to pass directly through, and the outer lens part to converge and supplement the light beams on the outer side, reducing the obstruction of the light path. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a circumferential zoned phototherapy device for acne lesion care according to the present invention; Figure 2 This is a cross-sectional view of the phototherapy head of the present invention along the central optical axis.

[0022] In the diagram: 1. Main unit; 2. Phototherapy head; 3. Multi-band light source assembly; 31. Mixing cavity; 32. Collimating light output component; 4. Control assembly; 5. Beam adjustment cavity; 51. Central spot adjustment assembly; 511. Central concave lens; 512. Central convex lens; 513. Thermosensitive drive assembly; 5131. First moving seat; 5132. Shape memory alloy spring; 5133. Reset spring; 5134. Limiting groove; 5135. Limiting protrusion; 6. Central light guide assembly; 61. Central light guide channel; 62. Central diffuser; 63. Central attenuator; 7. Circumferential... Light guide assembly; 71. Annular supplementary light adjustment assembly; 711. Annular convex lens; 712. Manual adjustment assembly; 7121. Rotary adjustment ring; 7122. Outer cylinder; 7123. Spiral groove; 7124. Inner cylinder; 7125. Vertical groove; 7126. Second moving seat; 7127. Pin shaft; 72. Circumferential light guide groove; 73. Annular light guide cavity; 74. Annular scattering layer; 75. Annular light emission area; 76. Inner light-shielding isolation wall; 77. Outer light-shielding ring; 8. Skin lesion positioning assembly; 81. Annular positioning seat; 82. Central clearance cavity; 83. Annular bonding surface. Detailed Implementation

[0023] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0024] like Figure 1 and Figure 2 As shown, the device in this embodiment includes a host 1, a phototherapy head 2, a multi-band light source assembly 3, and a control assembly 4. The host 1 provides power and houses the control components and the user interface; the control assembly 4 is electrically connected to the multi-band light source assembly 3 and is used to control its on / off state, band combination, and output intensity.

[0025] The phototherapy head 2 includes a beam adjustment cavity 5, a central light guide assembly 6, a circumferential light guide assembly 7, and a lesion positioning assembly 8. A multi-band light source assembly 3 is disposed on the upper side of the beam adjustment cavity 5 and outputs a collimated beam. The beam adjustment cavity 5 houses the central light spot adjustment assembly 51 and the ring supplementary light adjustment assembly 71.

[0026] The multi-band light source assembly 3 includes multiple light source units, a mixing cavity 31, and a collimating output element 32. The multiple light source units correspond to different bands of blue light, yellow light, red light, and near-infrared light, and include at least two different bands. Depending on the nursing mode, one light source unit can output individually, or multiple light source units can be combined for output. After the output light enters the mixing cavity 31 for mixing and / or homogenization, it passes through the collimating output element 32 to form a collimated beam propagating towards the skin contact side. The collimating output element 32 can be a collimating lens, a collimating lens group, or a collimating light guide.

[0027] The central beam adjustment assembly 51 includes a central concave lens 511, a central convex lens 512, and a thermal drive assembly 513, which are spaced apart along the optical axis. The central concave lens 511 is located above the central convex lens 512. The collimated beam is formed by the two lenses into an extended beam that simultaneously covers the incident light areas of the central light guide assembly 6, the circumferential light guide assembly 7, and the annular convex lens 711.

[0028] The extended light spot is divided into a central part, an intermediate annular part surrounding the central part, and an outer part surrounding the intermediate annular part in a radial direction from the inside to the outside: the central part enters the central light guide assembly 6; the intermediate annular part enters the circumferential light guide assembly 7 directly without passing through the annular convex lens 711; the outer part enters the annular convex lens 711 and is used for supplementary light.

[0029] The thermal drive assembly 513 is used to adjust the distance between the central concave lens 511 and the central convex lens 512. The central concave lens 511 is fixedly disposed in the beam adjustment cavity 5, and the central convex lens 512 is disposed on the first movable seat 5131 that can move along the optical axis.

[0030] The thermal drive assembly 513 also includes a shape memory alloy spring 5132 and a return spring 5133. The beam adjustment cavity 5 has a first fixed support portion located on the side of the first movable seat 5131 closer to the multi-band light source assembly 3 and a second fixed support portion located on the side of the first movable seat 5131 away from the multi-band light source assembly 3. The shape memory alloy spring 5132 abuts against the first fixed support portion and the first movable seat 5131, and the return spring 5133 abuts against the first movable seat 5131 and the second fixed support portion. The fixed support portion can be formed by the inner wall of the beam adjustment cavity 5, a fixed shoulder, or a fixed bracket.

[0031] The shape memory alloy spring 5132 and the return spring 5133 are both located in the annular mounting space on the outer periphery of the two lenses to avoid the central light-transmitting area. The limiting groove 5134 and the limiting protrusion 5135 between the first moving seat 5131 and the beam adjustment cavity 5 cooperate to limit the circumferential rotation of the first moving seat 5131 and guide its axial movement.

[0032] The shape memory alloy spring 5132, after shape memory training, elongates along the optical axis when its own temperature reaches a predetermined transition temperature. It responds to the ambient temperature rise in the outer periphery of the central optical path within the beam adjustment cavity 5, rather than directly detecting the surface temperature of the skin lesion. When the ambient temperature rises to the predetermined transition temperature, the shape memory alloy spring 5132 overcomes the elastic force of the return spring 5133, pushing the first moving seat 5131 to move away from the multi-band light source assembly 3, causing the central convex lens 512 to move downward and increasing the distance between the central concave lens 511 and the central convex lens 512.

[0033] The focal length and initial distance between the central concave lens 511 and the central convex lens 512, the predetermined travel distance of the first moving base 5131, and the position of the incident plane of the central light guide assembly 6 are configured such that, within the travel distance, as the distance between the central concave lens 511 and the central convex lens 512 increases, the beam cross-sectional area of ​​the extended light spot at the incident plane gradually increases, thereby reducing the light power density received by the fixed incident area. These parameters can be determined based on the target light output size through optical design, optical path simulation, or prototype debugging. When the elongation driving force of the shape memory alloy spring 5132 decreases to less than the elastic force of the return spring 5133, the return spring 5133 pushes the first moving base 5131 to reset.

[0034] The annular supplementary lighting adjustment component 71 is disposed on the outer periphery of the annular light-emitting area 75 and located upstream of the light-incident area of ​​the annular light guide component 7; it includes an annular convex lens 711 and a manual adjustment component 712. The annular convex lens 711 has a central through hole, which, in the optical axis projection, covers the light-incident area of ​​the central light guide component 6 and the first annular light-incident area of ​​the annular light guide groove 72, so that the light beams of the central part and the middle annular part pass downward without passing through the lens entity.

[0035] The annular convex lens 711 is located radially outside the first annular light-incident region and corresponds to the second annular light-incident region. The outer portion of the light beam converges inward and downward through it before entering the second annular light-incident region. Therefore, the annular light-out region 75 simultaneously receives the direct light from the middle annular portion and the converged supplementary light from the outer portion, maintaining circumferential illumination even when the irradiance of the central light-out region decreases.

[0036] The manual adjustment assembly 712 includes a rotating adjustment ring 7121, an outer cylinder 7122, a spiral groove 7123, an inner cylinder 7124, a vertical groove 7125, a second movable seat 7126, and a pin 7127. The inner cylinder 7124 is fixedly connected to the phototherapy head 2, and the outer cylinder 7122 is rotatably fitted onto its outer side. The rotating adjustment ring 7121 is fixed to the outer circumference of the outer cylinder 7122. The spiral groove 7123 and the vertical groove 7125 are respectively formed on the side walls of the outer cylinder 7122 and the inner cylinder 7124. The annular convex lens 711 is disposed on the second movable seat 7126. The pin 7127 passes through the vertical groove 7125 and the spiral groove 7123. When the rotating adjustment ring 7121 is rotated, the spiral groove 7123 drives the second movable seat 7126 to move axially along the vertical groove 7125 via the pin 7127, thereby adjusting the convergence degree of the outer portion of the light beam and the light power density of the circumferential incident light area.

[0037] The central light guide assembly 6 includes a central light guide channel 61, a central diffuser 62, and a central attenuator 63. The central light guide channel 61 corresponds to the central light-transmitting area. The central attenuator 63 is located on the side of the central diffuser 62 away from the skin contact end and has a predetermined transmittance within the operating wavelength range. It is used to attenuate the central portion of the light beam according to a predetermined ratio and reduce the optical power density of the central light-emitting area. The effective light-transmitting area of ​​the central attenuator 63 covers the maximum propagation range of the light beam in its plane, avoiding beam interception with a fixed aperture. It can be a neutral density attenuator, a semi-transparent attenuator, or an optical sheet with attenuation microstructures.

[0038] The central diffuser 62 is located at the light-emitting end of the central light guide channel 61 and is used to scatter and homogenize the light beam after it has been attenuated by the central attenuator 63.

[0039] The circumferential light guide assembly 7 also includes a circumferential light guide groove 72, an annular light guide cavity 73, an annular scattering layer 74, and an annular light output region 75. The middle annular portion of the light beam directly enters the first annular light input region, while the outer portion of the light beam is converged by an annular convex lens 711 and enters the second annular light input region. The two portions of the light beam converge within the annular light guide cavity 73 and are homogenized by the annular scattering layer 74, forming the annular light output region 75. The annular scattering layer 74 can be a frosted light-transmitting layer, a microstructured scattering layer, or a transparent layer containing scattering particles.

[0040] An inner light-shielding isolation wall 76 is provided between the circumferential light guide groove 72 and the central light guide component 6 to reduce light crosstalk between the central and circumferential areas; an outer light-shielding ring 77 is provided on the outside of the circumferential light guide groove 72 to limit the diffusion of light to non-target areas.

[0041] The lesion positioning component 8 includes an annular positioning seat 81, a central clearance cavity 82, and an annular contact surface 83. The annular positioning seat 81 is disposed at the skin contact end of the phototherapy head 2, and the annular contact surface 83 is formed on its end face facing the skin contact side; the annular contact surface 83 is disposed around the central clearance cavity 82; in this embodiment, the annular positioning seat 81 is fixed to the bottom outer periphery of the inner cylinder 7124, and can also be fixed to other fixing housings or support structures at the skin contact end.

[0042] The central light-emitting end face of the central light guide assembly 6 is recessed 0.5mm to 5mm away from the skin contact side relative to the annular fitting surface 83, and together with the inner peripheral wall of the annular positioning seat 81, defines a central clearance cavity 82 with an inner diameter of 3mm to 12mm and an opening towards the skin contact side. In use, the annular fitting surface 83 is fitted to the skin around the lesion, so that a non-contact space is formed between the central light-emitting end face and the center of the lesion.

[0043] In use, the annular contact surface 83 is attached to the area surrounding the lesion, and the central clearance cavity 82 corresponds to the center of the lesion. The light output from one or more light source units is mixed and / or homogenized by the mixing cavity 31, and then collimated by the collimating light output element 32 to form a collimated beam; this beam is formed by the central concave lens 511 and the central convex lens 512 to form an extended light spot covering the central light guide, the circumferential light guide and the light entrance area of ​​the annular convex lens 711.

[0044] The central portion of the extended light spot is attenuated by the central attenuator 63 and homogenized by the central diffuser 62 before being output to the corresponding area of ​​the skin lesion center; the middle annular portion directly enters the first annular light-receiving area; the outer portion is converged by the annular convex lens 711 and enters the second annular light-receiving area. The latter two portions of the beam converge in the annular light guide cavity 73 and are homogenized by the annular scattering layer 74 to form the annular light-exiting area 75.

[0045] When the ambient temperature rises and the shape memory alloy spring 5132 reaches the predetermined transition temperature, it pushes the first moving seat 5131 to move and increase the distance between the central concave lens 511 and the central convex lens 512, thereby increasing the beam cross-sectional area of ​​the extended light spot at the light incident plane of the central light guide assembly 6 and reducing the light power density received in the light incident area; the middle annular part and the outer supplementary beam still enter the circumferential light guide assembly 7 to maintain circumferential illumination.

[0046] Rotating the rotary adjustment ring 7121 according to nursing needs can drive the annular convex lens 711 to move axially through the outer cylinder 7122, spiral groove 7123, pin 7127, vertical groove 7125 and second moving seat 7126, thereby adjusting the convergence degree of the light beam in the outer part and the light power density of the circumferential light-incident area.

[0047] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Equivalent transformations or substitutions made by those skilled in the art to specific structures, connection methods, materials, and dimensions without departing from the concept of the present invention should all fall within the protection scope of the present invention.

Claims

1. A circumferential zoned phototherapy device for acne lesion care, characterized in that, The light therapy head (2) includes a light therapy head (2) and a multi-band light source assembly (3). The light therapy head (2) includes a beam adjustment cavity (5), a central light guide assembly (6) and a circumferential light guide assembly (7). The multi-band light source assembly (3) is disposed on one side of the beam adjustment cavity (5) and outputs a collimated beam that propagates along the optical axis to the beam adjustment cavity (5). The beam adjustment cavity (5) is provided with a central beam adjustment component (51). The central beam adjustment component (51) includes a central concave lens (511) and a central convex lens (512) spaced apart along the optical axis, and a thermal drive component (513) for adjusting the distance between the central concave lens (511) and the central convex lens (512). The collimated beam forms an extended beam through the central concave lens (511) and the central convex lens (512). The circumferential light guide assembly (7) has an annular light output area (75). The light-incident side of the circumferential light guide assembly (7) is provided with an annular convex lens (711) with a central through hole. The extended light spot includes, in a radial direction from the inside to the outside, a central portion of the light beam, an intermediate annular portion of the light beam surrounding the central portion of the light beam, and an outer portion of the light beam surrounding the intermediate annular portion of the light beam. The central portion of the light beam enters the central light guide assembly (6). The intermediate annular portion of the light beam directly enters the circumferential light guide assembly (7) through the central through hole. The outer portion of the light beam converges inward through the annular convex lens (711) and enters the circumferential light guide assembly (7), forming the annular light output area (75) by the circumferential light guide assembly (7).

2. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The thermal drive assembly (513) includes a first movable seat (5131), a shape memory alloy spring (5132), and a return spring (5133). The concave lens (511) is fixedly disposed in the beam adjustment cavity (5), and the convex lens (512) is disposed on the first movable seat (5131) which is capable of moving along the optical axis. The beam adjustment cavity (5) is provided with a first fixed support part located on the side of the first movable seat (5131) near the multi-band light source assembly (3) and a second fixed support part located on the side of the first movable seat (5131) away from the multi-band light source assembly (3). The shape memory alloy spring (5132) abuts between the first fixed support part and the first movable seat (5131), and the reset spring (5133) abuts between the first movable seat (5131) and the second fixed support part. The shape memory alloy spring (5132) and the reset spring (5133) are both located in the annular mounting space on the outer periphery of the central concave lens (511) and the central convex lens (512). The first movable seat (5131) and the beam adjustment cavity (5) are provided with mutually cooperating limiting grooves (5134) and limiting protrusions (5135).

3. The circumferential zoned phototherapy device for acne lesion care according to claim 2, characterized in that, The shape memory alloy spring (5132) is trained in shape memory and configured to elongate when its own temperature reaches a predetermined transition temperature, so as to push the first movable seat (5131) to move away from the multi-band light source assembly (3) and increase the distance between the central concave lens (511) and the central convex lens (512). The focal length and initial spacing of the concave lens (511) and the convex lens (512), the travel distance of the first moving seat (5131), and the position of the incident plane of the central light guide assembly (6) are configured such that: within the travel distance, as the distance between the concave lens (511) and the convex lens (512) increases, the beam cross-sectional area of ​​the extended light spot at the incident plane increases, and the light power density received by the incident area of ​​the central light guide assembly (6) decreases; when the elongation driving force of the shape memory alloy spring (5132) is less than the elastic force of the reset spring (5133), the reset spring (5133) pushes the first moving seat (5131) to reset.

4. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The circumferential light guide assembly (7) further includes a circumferential light guide groove (72), an annular light guide cavity (73), and an annular scattering layer (74). The circumferential light guide groove (72) includes a first annular light incident area and a second annular light incident area located outside the first annular light incident area. The annular convex lens (711) is located upstream of the circumferential light guide groove (72) along the optical axis. The central through hole covers the light-incident area of ​​the central light guide assembly (6) and the first annular light-incident area in the projection along the optical axis. The lens body portion of the annular convex lens (711) corresponds to the second annular light-incident area. The light beams received by the first annular light-incident area and the second annular light-incident area form the annular light-out area (75) through the annular light guide cavity (73) and the annular scattering layer (74).

5. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The phototherapy head (2) also includes a manual adjustment assembly (712) for adjusting the position of the annular convex lens (711) along the optical axis. The manual adjustment assembly (712) includes a rotating adjustment ring (7121), an outer cylinder (7122), a spiral groove (7123), an inner cylinder (7124), a vertical groove (7125), a second moving seat (7126), and a pin (7127). The inner cylinder (7124) is fixedly connected to the phototherapy head (2), the outer cylinder (7122) is rotatably sleeved on the outside of the inner cylinder (7124), the rotating adjustment ring (7121) is fixed to the outer periphery of the outer cylinder (7122), the spiral groove (7123) and the vertical groove (7125) are respectively opened on the side walls of the outer cylinder (7122) and the inner cylinder (7124); the annular convex lens (711) The pin (7127) is disposed on the second movable seat (7126) and passes through the vertical groove (7125) and the spiral groove (7123); the pin (7127) cooperates with the spiral groove (7123) and the vertical groove (7125) so that when the outer cylinder (7122) rotates, it drives the second movable seat (7126) to move axially along the vertical groove (7125).

6. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The central light guide assembly (6) includes a central light guide channel (61), a central diffuser (62), and a central attenuator (63). The central diffuser (62) is disposed at the light-emitting end of the central light guide channel (61), and the central attenuator (63) is disposed on the side of the central diffuser (62) away from the skin contact end. The central attenuator (63) has a predetermined transmittance within the operating wavelength range of the multi-band light source assembly (3), and its effective light-transmitting area covers the maximum propagation range of the central portion of the light beam at the plane where the central attenuator (63) is located.

7. The circumferential zoned phototherapy device for acne lesion care according to claim 4, characterized in that, An inner light-shielding isolation wall (76) is provided between the circumferential light guide groove (72) and the central light guide component (6), and an outer light-shielding ring (77) is provided on the outer side of the circumferential light guide groove (72).

8. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The phototherapy head (2) also includes a lesion positioning component (8), which includes an annular positioning seat (81), a central clearance cavity (82), and an annular contact surface (83). The annular positioning seat (81) is disposed at the skin contact end of the phototherapy head (2), and the annular contact surface (83) is formed on the end face of the annular positioning seat (81) facing the skin contact side. The annular contact surface (83) is disposed around the central clearance cavity (82). The central light-emitting end face of the central light guide assembly (6) is recessed by 0.5 mm to 5 mm relative to the annular bonding surface (83) in a direction away from the skin contact side. The central light-emitting end face and the inner peripheral wall of the annular positioning seat (81) together define the central clearance cavity (82) which opens toward the skin contact side. The inner diameter of the central clearance cavity (82) is 3 mm to 12 mm.

9. The circumferential zoned phototherapy device for acne lesion care according to claim 1, characterized in that, The multi-band light source assembly (3) includes multiple light source units, a mixing cavity (31), and a collimating output element (32). The multiple light source units correspond to different bands of blue light, yellow light, red light, and near-infrared light, and the multiple light source units include at least two different bands of light source units. The light output from one or more of the multiple light source units is mixed and / or homogenized by the mixing cavity (31), and then collimated by the collimating output element (32) to form the collimated beam.

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