Front joint and photocuring machine

Abstract

The utility model provides a kind of front joint and light curing machine, it is related to medical instrument field.The utility model provides a kind of front joint and light curing machine, by setting light source assembly, light emitted by light source assembly works through light transmission port, light beam is emitted from light outlet and effectively irradiates to photosensitive resin material, so that it solidifies;By setting liquid lens, the focal length of liquid lens is changed under the condition of additional voltage, the diameter of light beam emitted by light source assembly is adjusted, and then the spot diameter formed after the light beam emitted from light outlet is emitted for a distance is adjustable;The application is continuously adjusted by the above design in the case where not depending on mechanical movement, the spot diameter formed after the light beam emitted from light outlet is emitted for a distance in limited space is continuously adjusted, so that doctor can select the diameter of spot according to actual operation condition to select different voltage, and the whole machine structure of light curing machine is optimized.

Description

Technical Field

[0001] This utility model relates to the field of medical device technology, and more specifically, to a front connector and a light curing machine. Background Technology

[0002] A light-curing machine is an oral device used for dental restoration. It uses the principle of light curing to rapidly cure dental restorative resin materials under the action of light waves within a specific wavelength range, thereby filling cavities or bonding brackets.

[0003] While front-joint type light-curing machines offer good light focusing and high curing efficiency, they are not ideal for posterior teeth. Furthermore, different operating methods and tooth areas require varying irradiation ranges and spot sizes. Although dentists can adjust the direction of the light irradiation by operating the light-curing machine, the spot size is not adjustable, limiting the irradiation range. This hinders clinical practice and can even affect the curing of photosensitive resin materials, ultimately impacting treatment outcomes. Utility Model Content

[0004] The purpose of this invention is to provide a front connector and a light curing machine that can continuously adjust the diameter of the light spot formed after the light beam emitted from the light outlet has traveled a certain distance.

[0005] The embodiments of this utility model can be implemented as follows:

[0006] In a first aspect, this utility model provides a front connector, comprising: a front connector body, one end of which is provided with a light outlet;

[0007] A liquid lens and a light source assembly are disposed inside the front connector body. Along the light emission direction of the light source assembly, the light outlet, the liquid lens, and the light source assembly are coaxially arranged in sequence.

[0008] Under the condition of an applied voltage, the focal length of the liquid lens changes, so that the diameter of the light spot formed by the light beam emitted from the light outlet is adjustable.

[0009] In an optional embodiment, the liquid lens contains a liquid crystal layer;

[0010] The front connector also includes a zoom element. The liquid lens has an incident end near the light source assembly and an exit end away from the light source assembly. The zoom element is used to apply different voltages to the incident end and the exit end of the liquid crystal layer to adjust the refractive index of the liquid crystal layer, thereby changing the focal length of the liquid lens.

[0011] In an optional embodiment, the liquid lens includes a first transparent substrate and a second transparent substrate disposed opposite to and sealed together, and the liquid crystal layer is sealed between the first transparent substrate and the second transparent substrate;

[0012] The first transparent substrate is disposed at the incident end of the light source assembly, and the second transparent substrate is disposed at the emitting end of the light source assembly.

[0013] In an optional embodiment, a first electrode layer is provided on the inner wall of the first transparent substrate facing the second transparent substrate, and a second electrode layer is provided on the inner wall of the second transparent substrate facing the first transparent substrate.

[0014] The zoom element is electrically connected to the first electrode layer and the second electrode layer respectively. The zoom element is used to apply different voltages to the first electrode layer and the second electrode layer to adjust the refractive index of the liquid crystal layer, thereby changing the focal length of the liquid lens.

[0015] In an optional embodiment, a transparent conductive material is coated on the inner wall of the first transparent substrate to form the first electrode layer; and a transparent conductive material is coated on the inner wall of the second transparent substrate to form the second electrode layer.

[0016] The transparent conductive material includes indium tin oxide or indium zinc oxide.

[0017] In an optional embodiment, the liquid lens is provided with a conductive liquid layer and an insulating liquid layer, and a liquid-liquid interface is formed at the interface between the conductive liquid layer and the insulating liquid layer.

[0018] The front connector also includes a zoom element, which is used to apply a voltage to the conductive liquid layer and the insulating liquid layer to deform the liquid-liquid interface and thereby change the focal length of the liquid lens.

[0019] In an optional embodiment, the liquid lens includes a lens barrel, a third transparent substrate, and a fourth transparent substrate. The lens barrel includes an incident end near the light source assembly and an exit end away from the light source assembly. The lens barrel is provided with a hollow receiving cavity. The incident end of the lens barrel is sealed with the third transparent substrate, and the exit end of the lens barrel is sealed with the fourth transparent substrate.

[0020] The conductive liquid layer and the insulating liquid layer are sealed within the hollow cavity, and the insulating liquid layer and the conductive liquid layer are arranged sequentially from the incident end to the exit end of the light source assembly.

[0021] In an optional embodiment, a third electrode layer is provided at one end of the third transparent substrate near the light source assembly, and a fourth electrode layer is provided on the inner wall of the lens barrel;

[0022] The zoom element is electrically connected to the third electrode layer and the fourth electrode layer. The zoom element provides different voltages to the lens barrel and the third electrode layer to change the shape of the liquid-liquid interface.

[0023] In an optional embodiment, the front connector body includes a first part and a second part, wherein one end of the first part and the second part are arranged at an angle.

[0024] The light outlet is located at the end of the first part away from the second part, and the liquid lens and the light source assembly are both located within the first part.

[0025] Secondly, this utility model provides a photocuring machine, including the front connector described in any of the foregoing embodiments.

[0026] The beneficial effects of the front connector and UV curing machine provided in this embodiment of the invention include:

[0027] By setting up a light source component, the light emitted by the light source component during operation passes through a light-transmitting port, and the beam exits from the light-emitting port to effectively irradiate the photosensitive resin material, causing it to cure. By setting up a liquid lens, under the condition of an applied voltage, the focal length of the liquid lens is changed, thereby adjusting the diameter of the beam emitted by the light source component. This allows the diameter of the light spot formed after the beam exits from the light-emitting port for a certain distance to be adjustable. Through the above design, this application achieves continuous adjustment of the diameter of the light spot formed after the beam exits from the light-emitting port for a certain distance within a limited space without relying on mechanical movement. This allows doctors to select different voltages to choose the diameter of the light spot according to the actual operation, reducing the difficulty of operation for doctors and optimizing the overall structure of the light curing machine. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the photopolymerization machine provided in this embodiment;

[0030] Figure 2 This is a schematic diagram of the front connector provided in this embodiment;

[0031] Figure 3This is a schematic diagram of the first structure of the liquid lens provided in this embodiment, which is a liquid crystal lens;

[0032] Figure 4 This is a schematic diagram of the second structure of the liquid lens provided in this embodiment, which is a liquid crystal lens;

[0033] Figure 5 This is a schematic diagram of the first structure of an electrowetting liquid lens provided in this embodiment;

[0034] Figure 6 This is a schematic diagram of the second structure of the liquid lens provided in this embodiment, which is an electrowetting liquid lens.

[0035] Icons: 010-Radio Curing Machine; 011-Front Connector; 012-Handle; 013-Battery Compartment; 100-Front Connector Body; 101-First Part; 102-Second Part; 103-Light Emission Port; 200-Light Source Assembly; 300-Liquid Lens; 310-Zoom Component; 320-Liquid Crystal Layer; 321-Liquid Crystal Molecule; 330-First Transparent Substrate; 340-Second Transparent Substrate; 350-First Electrode Layer; 360-Second Electrode Layer; 301-Conductive Liquid Layer; 302-Insulating Liquid Layer; 303-Liquid-Liquid Interface; 304-Lens Barrel; 305-Third Transparent Substrate; 306-Fourth Transparent Substrate; 307-Third Electrode Layer; 308-Fourth Electrode Layer; 400-Optical Lens. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0040] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0042] The following describes in detail the overall structure, working principle, and technical effects of the front connector 011 and the light curing machine 010 provided by this utility model through embodiments and in conjunction with the accompanying drawings.

[0043] Please refer to Figure 1 The front connector 011 and light curing machine 010 provided by this utility model are applied in oral restoration treatment. Doctors can continuously adjust the size of the light spot emitted from the light outlet 103 according to the usage situation, so that the light spot can effectively irradiate the photosensitive resin material filled in the tooth and cure it.

[0044] Please refer to Figure 1 The present invention proposes a light curing machine 010, which includes a front connector 011, a handle 012 and a battery compartment 013 connected in sequence and detachably; wherein the battery compartment 013 supplies power to the components in the handle 012 and the front connector 011.

[0045] Please refer to Figure 2 The present invention proposes a front connector 011, including: a front connector body 100, one end of which is provided with a light outlet 103;

[0046] The liquid lens 300 and the light source assembly 200 are disposed inside the front connector body 100. Along the light emission direction of the light source assembly 200, the light outlet 103, the liquid lens 300 and the light source assembly 200 are coaxially arranged in sequence.

[0047] Under the condition of an applied voltage, the focal length of the liquid lens 300 changes, so that the diameter of the light spot formed by the light beam emitted from the light outlet 103 can be adjusted.

[0048] It is understandable that by setting up the light source component 200, the light emitted by the light source component 200 during operation passes through the light transmission port, and the beam is emitted from the light outlet 103 to effectively irradiate the photosensitive resin material, causing it to cure. By setting up the liquid lens 300, under the condition of an applied voltage, the focal length of the liquid lens 300 is changed, thereby adjusting the diameter of the beam emitted by the light source component 200, so that the diameter of the light spot formed by the beam emitted from the light outlet 103 after traveling a certain distance is adjustable. Through the above design, this application realizes the continuous adjustment of the diameter of the light spot formed by the beam emitted from the light outlet 103 after traveling a certain distance, allowing doctors to select different voltages to select the diameter of the light spot according to the actual operation situation, reducing the difficulty of operation for doctors and optimizing the overall structure of the light curing machine 010.

[0049] If the focal length of the liquid lens 300 decreases, the diameter of the light spot at a certain distance from the light outlet 103 decreases. If the focal length of the liquid lens 300 increases, the diameter of the light spot at a certain distance from the light outlet 103 increases.

[0050] For example, with the power of the light source component 200 fixed, after the dentist fills the deeper area of ​​the tooth decay with photosensitive resin material, the focal length of the liquid lens 300 can be reduced, the diameter of the light spot can be reduced, and the light energy density per unit area of ​​the light spot can be increased, thereby enhancing the polymerization reaction efficiency, curing depth and curing effect.

[0051] For example, with the power of the light source component 200 fixed, after the dentist fills the superficial area of ​​the tooth with photosensitive resin material or seals the pits and fissures, the focal length of the liquid lens 300 can be increased, making the spot diameter larger. The light energy density per unit area of ​​the spot is still within the standard range, which improves the coverage of the spot and reduces the number of irradiations.

[0052] In this embodiment, please refer to Figure 2 The front connector body 100 has a bending angle and includes a first part 101 and a second part 102. The first part 101 and one end of the second part 102 are set at an angle, and the other end of the second part 102 is used to connect the handle 012. A light outlet 103 is provided at the end of the first part 101 away from the second part 102. The liquid lens 300 and the light source assembly 200 are both disposed in the first part 101.

[0053] Of course, in an optional embodiment, the front connector 011 can also be a front connector 011 arranged along a straight line. It is understood that the UV curing machine 010 can select different types of front connector 011 structures in specific application scenarios, and this embodiment does not limit this.

[0054] In this embodiment, the front connector body 100 has an installation groove on the inner wall at the light outlet 103, and an optical lens 400 is provided in the installation groove.

[0055] In this embodiment, the front connector 011 includes a light source assembly 200.

[0056] In this embodiment, please refer to Figure 2 The light source assembly 200 includes one LED. Of course, in other embodiments, the source assembly can be multiple LEDs, which can be LEDs of various different wavelengths, and can also be LEDs that emit blue, violet, or red light.

[0057] In this embodiment, the front connector 011 includes a liquid lens 300.

[0058] In this embodiment, please refer to Figure 2 The liquid lens 300 and the light source assembly 200 are disposed inside the front connector body 100. Along the light emission direction of the light source assembly 200, the light outlet 103, the liquid lens 300 and the light source assembly 200 are coaxially arranged in sequence. Under the condition of an applied voltage, the focal length of the liquid lens 300 changes so that the diameter of the light spot formed by the light beam emitted from the light outlet 103 is adjustable.

[0059] In this embodiment, please refer to Figures 3-4 The liquid lens 300 is a liquid crystal lens driven by an edge electric field. The liquid lens 300 contains a liquid crystal layer 320, and the front connector 011 also includes a zoom element 310. The liquid lens 300 has an incident end near the light source assembly 200 and an exit end away from the light source assembly 200. The zoom element 310 is used to apply different voltages to the incident and exit ends of the liquid crystal layer 320 to adjust the refractive index of the liquid crystal layer 320, thereby changing the focal length of the liquid lens 300.

[0060] In this embodiment, please refer to Figures 3-4 The liquid lens 300 includes a liquid crystal layer 320 and a first transparent substrate 330 and a second transparent substrate 340 that are disposed opposite to and sealed together. The liquid crystal layer 320 is sealed between the first transparent substrate 330 and the second transparent substrate 340. The liquid lens 300 has an incident end near the light source assembly 200 and an exit end away from the light source assembly 200. The first transparent substrate 330 is disposed at the incident end of the light source assembly 200, and the second transparent substrate 340 is disposed at the exit end of the light source assembly 200.

[0061] Both the first transparent substrate 330 and the second transparent substrate 340 are transparent flat panel structures. Optionally, the first transparent substrate 330 and the second transparent substrate 340 can be sealed together by applying sealant along the gaps at their outer edges. Alternatively, the first transparent substrate 330 and the second transparent substrate 340 can also be sealed together by providing sealing rings at their outer edges.

[0062] In this embodiment, please refer to Figures 3-4 A first electrode layer 350 is provided on the inner wall of the first transparent substrate 330 facing the second transparent substrate 340, and a second electrode layer 360 is provided on the inner wall of the second transparent substrate 340 facing the first transparent substrate 330. The zoom member 310 is electrically connected to the first electrode layer 350 and the second electrode layer 360 respectively. The zoom member 310 is used to apply different voltages to the first electrode layer 350 and the second electrode layer 360 to adjust the refractive index in the liquid crystal layer 320, thereby changing the focal length of the liquid lens 300.

[0063] Optionally, the zoom element 310 can be a power source. The zoom element 310 can be built into the second part 102 and connected to the first electrode layer 350 and the second electrode layer 360 via built-in connecting wires.

[0064] The focal length of the liquid lens 300 can be precisely and quickly adjusted by changing the voltage applied to the first electrode layer 350 and the second electrode layer 360 by the zoom element 310.

[0065] In this embodiment, a first electrode layer 350 is formed by coating a transparent conductive material on the inner wall of the first transparent substrate 330; and a second electrode layer 360 is formed by coating a transparent conductive material on the inner wall of the second transparent substrate 340.

[0066] Alternatively, the transparent conductive material includes indium tin oxide (ITO) or indium zinc oxide (IZO).

[0067] It is understandable that the zoom element 310 applies different voltages to the first electrode layer 350 and the second electrode layer 360, and the liquid crystal in the liquid crystal layer 320 inside the liquid lens 300 exhibits different orientations, thereby generating a refractive index gradient. The refractive index of the liquid crystal layer 320 changes, which in turn changes the focal length of the liquid lens 300.

[0068] Please refer to Figure 3 When the zoom element 310 does not apply voltage to the first electrode layer 350 and the second electrode layer 360, the long axis of the liquid crystal molecules 321 in the liquid crystal layer 320 is horizontal, the liquid crystal molecules 321 hardly deflect, and the refractive index at each position in the liquid crystal layer 320 remains unchanged.

[0069] Please refer to Figure 4When the zoom element 310 applies a voltage to the second electrode layer 360 and / or the first electrode layer 350, the liquid crystal molecules 321 in the liquid crystal layer 320 change from a horizontal state to deflection along the electric field lines. The arrangement of the liquid crystal molecules 321 will change, thereby affecting the propagation path of the light beam, which in turn changes the refractive index of the liquid crystal layer 320, and thus changes the focal length of the liquid lens 300.

[0070] By applying different voltages to the second electrode layer 360 and the first electrode layer 350, the intensity and distribution of the electric field are controlled, causing changes in the liquid crystal molecules 321 of the liquid crystal layer 320, thereby changing the refractive index of the liquid lens 300 for incident light, thus achieving dynamic adjustment of the focal length. This enables continuous adjustment of the diameter of the light spot formed after the light beam emitted from the light outlet 103 has traveled a certain distance.

[0071] In one alternative embodiment, please refer to Figures 5-6 The liquid lens 300 is an electrowetting liquid lens 300. The liquid lens 300 contains a conductive liquid layer 301 and an insulating liquid layer 302, with a liquid-liquid interface 303 formed at the interface between the conductive liquid layer 301 and the insulating liquid layer 302. The front connector 011 also includes a zoom element 310, which applies a voltage to the conductive liquid layer 301 and the insulating liquid layer 302 to deform the liquid-liquid interface 303, thereby changing the focal length of the liquid lens 300.

[0072] Optionally, the insulating liquid layer 302 is a colorless and transparent oily liquid, which may be one or more of colorless and transparent silicone oil, alkane alcohols, etc.

[0073] Optionally, the conductive liquid layer 301 can be an aqueous solution of salt, such as a colorless and transparent solution like KCl solution, NaCl solution, or Na2SO4 solution.

[0074] In this embodiment, please refer to Figures 5-6 The liquid lens 300 includes a lens barrel 304, a third transparent substrate 305, and a fourth transparent substrate 306. The lens barrel 304 includes an incident end near the light source assembly 200 and an exit end away from the light source assembly 200. The lens barrel 304 is provided with a hollow receiving cavity. The incident end of the lens barrel is sealed with the third transparent substrate 305, and the exit end of the lens barrel is sealed with the fourth transparent substrate 306.

[0075] The conductive liquid layer 301 and the insulating liquid layer 302 are sealed within the hollow cavity, and the insulating liquid layer 302 and the conductive liquid layer 301 are arranged sequentially from the incident end to the exit end of the light source assembly 200.

[0076] In this embodiment, please refer to Figures 5-6The third transparent substrate 305 has a third electrode layer 307 at one end near the light source assembly 200, and the inner wall of the lens barrel 304 has a fourth electrode layer 308. The zoom member 310 is electrically connected to the third electrode layer 307 and the fourth electrode layer 308. The zoom member 310 provides different voltages to the fourth electrode layer 308 and the third electrode layer 307 to change the shape of the liquid-liquid interface 303.

[0077] Optionally, the zoom element 310 can be a power source. The zoom element 310 can be built into the second part 102 and connected to the third electrode layer 307 and the fourth electrode layer 308 via built-in connecting wires.

[0078] The focal length of the liquid lens 300 can be precisely and quickly adjusted by changing the voltage applied to the four electrode layers and the third electrode layer 307 by the zoom element 310.

[0079] Optionally, a transparent conductive material is coated on one end of the third transparent substrate 305 near the light source assembly 200 to form a third electrode layer 307; a transparent conductive material is coated on the inner wall of the lens barrel 304 to form the third electrode layer 307, wherein the transparent conductive material includes indium tin oxide (ITO) or indium zinc oxide (IZO).

[0080] Understandably, please refer to Figure 5 When no voltage is applied to the zoom element 310, the liquid-liquid interface 303 formed by the insulating liquid layer 302 and the conductive liquid layer 301 is a first convex surface, which protrudes towards the exit end. Due to the surface tension, the initial contact angle between the insulating liquid layer 302 and the conductive liquid layer 301 is large, and the curvature of the liquid surface of the liquid-liquid interface 303 is large. At this time, the focal length of the lens formed by the droplet is short.

[0081] Please refer to Figure 6 When the zoom element 310 applies a voltage to the liquid lens 300, due to the electrowetting (EWOD) effect on the dielectric, the contact angle between the insulating liquid layer 302 and the conductive liquid layer 301 will decrease, and the curvature of the liquid surface will also decrease. The liquid-liquid interface 303 formed by the insulating liquid layer 302 and the conductive liquid layer 301 is a second convex surface. The second convex surface protrudes towards the exit end, and the protrusion height of the first convex surface is higher than the protrusion height of the second convex surface. After the incident light passes through the insulating liquid layer 302 and the conductive liquid layer 301, it will converge to a more distant point, that is, the focal length of the liquid lens 300 increases.

[0082] Therefore, by adjusting the magnitude of the voltage applied to the third electrode layer 307 and the fourth electrode layer 308, the curvature of the droplet surface is changed, thereby changing the refractive index of the liquid lens 300 for incident light, thus achieving the purpose of dynamic adjustment of the focal length, and realizing the continuous adjustment of the diameter of the light spot formed by the light beam emitted from the light outlet 103 after it has traveled a certain distance.

[0083] In summary, the front connector 011 and the photocuring machine 010 provided in this embodiment of the present invention, by setting a light source component 200, the light emitted by the light source component 200 during operation passes through a light-transmitting port, and the light beam exits from the light-exit port 103 to effectively irradiate the photosensitive resin material, thereby curing it; by setting a liquid lens 300, the focal length of the liquid lens 300 changes under the condition of an applied voltage, thereby adjusting the diameter of the light beam emitted by the light source component 200, so that the diameter of the light spot formed by the light beam emitted from the light-exit port 103 after traveling a certain distance is adjustable; through the above design, this application achieves continuous adjustment of the diameter of the light spot formed by the light beam emitted from the light-exit port 103 after traveling a certain distance within a limited space without relying on mechanical movement, so that doctors can select different voltages to select the diameter of the light spot according to the actual operation situation, reducing the difficulty of operation for doctors and optimizing the overall structure of the photocuring machine 010.

[0084] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A front joint, characterized in that include: A front connector body, one end of which is provided with a light outlet; A liquid lens and a light source assembly are disposed inside the front connector body. Along the light emission direction of the light source assembly, the light outlet, the liquid lens, and the light source assembly are coaxially arranged in sequence. Under the condition of an applied voltage, the focal length of the liquid lens changes, so that the diameter of the light spot formed by the light beam emitted from the light outlet is adjustable.

2. The front joint of claim 1, wherein The liquid lens contains a liquid crystal layer; The front connector also includes a zoom element. The liquid lens has an incident end near the light source assembly and an exit end away from the light source assembly. The zoom element is used to apply different voltages to the incident end and the exit end of the liquid crystal layer to adjust the refractive index of the liquid crystal layer, thereby changing the focal length of the liquid lens.

3. The front joint of claim 2, wherein, The liquid lens includes a first transparent substrate and a second transparent substrate that are disposed opposite to each other and sealed together, and the liquid crystal layer is sealed between the first transparent substrate and the second transparent substrate; The first transparent substrate is disposed at the incident end of the light source assembly, and the second transparent substrate is disposed at the emitting end of the light source assembly.

4. The front joint of claim 3, wherein, A first electrode layer is provided on the inner wall of the first transparent substrate facing the second transparent substrate, and a second electrode layer is provided on the inner wall of the second transparent substrate facing the first transparent substrate. The zoom element is electrically connected to the first electrode layer and the second electrode layer respectively. The zoom element is used to apply different voltages to the first electrode layer and the second electrode layer to adjust the refractive index of the liquid crystal layer, thereby changing the focal length of the liquid lens.

5. The front joint of claim 4, wherein, A transparent conductive material is coated on the inner wall of the first transparent substrate to form the first electrode layer; a transparent conductive material is coated on the inner wall of the second transparent substrate to form the second electrode layer.

6. The front joint of claim 1, wherein, The liquid lens contains a conductive liquid layer and an insulating liquid layer, and a liquid-liquid interface is formed at the interface between the conductive liquid layer and the insulating liquid layer. The front connector also includes a zoom element, which is used to apply a voltage to the conductive liquid layer and the insulating liquid layer to deform the liquid-liquid interface and thereby change the focal length of the liquid lens.

7. The front joint of claim 6, wherein, The liquid lens includes a lens barrel, a third transparent substrate, and a fourth transparent substrate. The lens barrel includes an incident end near the light source assembly and an exit end away from the light source assembly. The lens barrel is provided with a hollow receiving cavity. The incident end of the lens barrel is sealed with the third transparent substrate, and the exit end of the lens barrel is sealed with the fourth transparent substrate. The conductive liquid layer and the insulating liquid layer are sealed within the hollow cavity, and the insulating liquid layer and the conductive liquid layer are arranged sequentially from the incident end to the exit end of the light source assembly.

8. The front joint of claim 7, wherein, The third transparent substrate has a third electrode layer at one end near the light source assembly, and the inner wall of the lens barrel has a fourth electrode layer. The zoom element is electrically connected to the third electrode layer and the fourth electrode layer. The zoom element provides different voltages to the lens barrel and the third electrode layer to change the shape of the liquid-liquid interface.

9. The front connector according to claim 1, characterized in that, The front connector body includes a first part and a second part, wherein one end of the first part and the second part are set at an angle together; The light outlet is located at the end of the first part away from the second part, and the liquid lens and the light source assembly are both located within the first part.

10. A photocuring machine, characterized in that, Includes the front connector as described in any one of claims 1-9.

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