A working head for homogenizing the light spot of a broad spectrum light curing machine

Abstract

The utility model discloses a kind of working heads of homogenization broad spectrum light curing machine light spot, including head shell, inside forming installation cavity, one end is light outlet end, the other end is used to connect light curing machine host computer;Broad spectrum LED chip group, fixed in the bottom of the head shell installation cavity, for emitting blue-violet light mixed light beam;Aspherical lens, set in the light outlet side of the broad spectrum LED chip group, the light outlet surface of aspherical lens is aspherical surface;Optical lens is set in the light outlet side of aspherical lens, and fixed on head shell. By optimizing optical component structure and layout, realize light spot homogenization, avoid lens pollution, while simplify structure, reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of dental medical equipment technology, specifically to a working head for homogenizing the light spot of a broadband light curing machine. Background Technology

[0002] Dental light-curing units are key pieces of equipment in clinical dental treatment, primarily used for anterior aesthetic restorations (such as veneer bonding and gap closure) and routine dental restorations (such as resin fillings after root canal treatment and fissure sealing). Their working principle is as follows: a built-in light source in the unit emits visible light of a specific wavelength, which excites the photoinitiator in the photosensitive resin, causing the resin monomers to polymerize and rapidly harden, thus completing the dental restoration.

[0003] Currently, mainstream dental light-curing machines use LEDs as the light source, and can be divided into narrow-spectrum and broadband light-curing machines based on the wavelength range of the light source. Among them, broadband light-curing machines use a mixed blue-violet LED light source, which is compatible with a variety of photoinitiators on the market, making it more widely applicable and thus increasingly used in clinical practice. In the performance evaluation indicators of broadband light-curing machines, the uniformity of the light spot directly determines the curing quality of the photosensitive resin. If the blue-violet light in the light spot is unevenly mixed or the boundary is irregular, it will lead to insufficient or over-curing of the resin in some areas, reducing the restorative effect. At the same time, if the lens at the light output end of the machine head is not designed properly, it can easily come into contact with uncured photosensitive resin, causing contamination and affecting the light output efficiency.

[0004] In existing technologies, improvements to UV curing machines primarily focus on heat dissipation and burn prevention (e.g., patent CN220967424U discloses "a UV curing working part and a UV curing machine," which uses structures such as heat insulation pads, thermally conductive packaging materials, and heat storage materials to slow heat conduction to the metal casing and prevent burns to patients), but do not address issues such as light spot uniformity and lens contamination. Current broadband UV curing machines have the following optical system deficiencies: Poor beam uniformity: Using a spherical lens to shape the mixed blue-violet light beam results in uneven mixing of blue and violet light due to the significant differences in refractive properties of the lens for different wavelengths (blue and violet). This leads to an irregular beam shape and unclear blue-violet light boundaries, negatively impacting the uniformity of resin curing. Figure 3 As shown.

[0005] Lens is prone to contamination: The light output end uses a convex lens, and the outer end face of the lens protrudes from the fixed structure (such as the lens clamping sleeve). During clinical operation, it is easy to come into contact with the uncured photosensitive resin on the tooth surface, which not only contaminates the lens and reduces the light output efficiency, but may also damage the resin morphology and increase the difficulty of operation. Structural redundancy: Some devices use a condenser cup between the light source and the lens to focus the beam, but the presence of the condenser cup will further exacerbate the differences in the propagation paths of beams of different wavelengths, which will affect the beam uniformity and increase the size and cost of the device.

[0006] Therefore, developing a broadband light curing machine optical device that can solve the problems of insufficient light spot uniformity and easy lens contamination, and has a simple structure, has become a key requirement for improving the effectiveness and ease of operation of dental restorations. Utility Model Content

[0007] The purpose of this invention is to address the problems of uneven light spot mixing, easy lens contamination, and redundant structure (focusing cup) in existing broadband UV curing machines. This invention provides a working head for homogenizing the light spot of a broadband UV curing machine. By optimizing the structure and layout of optical components, it achieves light spot homogenization, avoids lens contamination, and simplifies the structure and reduces costs.

[0008] The technical solution to achieve the purpose of this utility model is: A working head for homogenizing the light spot of a broadband photocuring machine includes: The head housing has an internal mounting cavity, with one end being the light-emitting end and the other end used to connect to the main unit of the UV curing machine; A broadband LED chip assembly is fixed to the bottom of the mounting cavity of the head housing and is used to emit a mixed blue-violet light beam; An aspherical lens is disposed on the light-emitting side of the broadband LED chip group; the light-emitting surface of the aspherical lens is aspherical, and its curvature is designed according to the difference in refractive index between blue light and violet light, and is used to shape and homogenize the mixed blue-violet light beam. An optical lens, fixed to the head housing, is used to protect the aspherical lens and reduce light loss; The broadband LED chipset includes at least one blue LED chip (wavelength 450-470nm) and one violet LED chip (wavelength 400-410nm).

[0009] The aspherical lens is made of optical-grade PMMA resin or optical glass, with a light transmittance of ≥90%.

[0010] The curvature of the aspherical surface of the aspherical lens is designed based on the difference between blue light (refractive index 1.48-1.50) and violet light (refractive index 1.50-1.52).

[0011] The optical lens is fixed to the head housing by a lens clamping sleeve or UV adhesive.

[0012] The lens clamping sleeve is made of ABS plastic, and its light-emitting end is provided with a stepped surface. The optical lens is fixed to the stepped surface by UV glue, and after fixing, the flatness error between the outer end face of the optical lens and the outer end face of the lens clamping sleeve is ≤0.1mm.

[0013] The head housing is made of aluminum alloy, and the diameter of the internal mounting cavity is 10-15mm and the length is 25-35mm.

[0014] The aspherical lens is cured with UV adhesive and encapsulated with a broadband LED chip. The lens clamping sleeve is fixed to the head housing by threaded connection or snap-fit ​​connection.

[0015] The optical lens is a planar lens or a biconvex lens, with a light transmittance ≥95% and a thickness of 1-3mm.

[0016] The present invention provides a working head for homogenizing the light spot of a broadband photocuring machine. Compared with the prior art, the present invention has the following advantages: 1. Significantly improved light spot uniformity: By using an aspherical lens to differentiate the blue and violet light, the blue and violet light are mixed evenly and the light spot is a standard circle, ensuring that the curing rate of the photosensitive resin is consistent in all areas and improving the stability of the repair effect; 2. Completely solves the problem of lens contamination: The outer end face of the planar lens is flush with the lens clamping sleeve, avoiding resin contact contamination caused by the protrusion of traditional convex lenses, reducing the frequency of lens cleaning, and improving the efficiency of surgical operations; 3. Simplified structure and reduced cost: The redundant condenser cup structure is removed, and the core function is achieved only through the combination of aspherical lens and plane lens. The overall layout of the machine head is not changed, and there is no need to redesign the mold, which reduces the production modification cost. 4. Complementary to heat dissipation technology: Patent CN220967424U focuses on "heat dissipation and prevention of burns", while this application focuses on "spot uniformity and ease of operation". The two can be combined and applied to the same light curing machine to solve the two core issues of safety and performance at the same time. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the working head of a broadband UV curing machine for homogenizing the UV spot. Figure 2 for Figure 1 Schematic diagram of the light spot on the working head; Figure 3 A schematic diagram of the light spot in an existing broadband UV curing machine; The markings in the diagram are as follows: 1. Head housing; 2. Broadband LED chipset; 3. Lens clamping sleeve; 4. Aspherical lens; 5. Plane lens; 6. Wire. Detailed Implementation

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments, but this is not intended to limit the present invention. Example

[0019] like Figure 1 As shown, a working head for homogenizing the light spot of a broadband UV curing machine includes: The head housing 1 has an internal mounting cavity, with one end being the light-emitting end and the other end used to connect to the main unit of the UV curing machine; A broadband LED chip group 2 is fixed to the bottom of the mounting cavity of the head housing 1 and is used to emit a mixed blue-violet light beam; An aspherical lens 4 is disposed on the light-emitting side of the broadband LED chip group 2; the light-emitting surface of the aspherical lens 4 is aspherical, and its curvature is designed according to the difference in refractive index between blue light and violet light, used to shape and homogenize the mixed blue-violet light beam, such as... Figure 2 As shown; The plane lens 5 is fixed to the head housing by the lens clamping sleeve 3. Its outer end face is flush with the outer end face of the lens clamping sleeve 3, which is used to protect the aspherical lens 3 and reduce light loss. In this embodiment, the broadband LED chip group 2 uses three blue LED chips (wavelength 460nm) and one purple LED chip (wavelength 405nm), which are centrally symmetrically distributed on the circuit board at the bottom of the mounting cavity of the head housing 1, with the light-emitting surface of the chip facing the aspherical lens 4.

[0020] The aspherical lens 4 is made of optical-grade PMMA resin (transmittance ≥92%), with an incident light surface concave curvature radius of 8mm, and an exit light surface aspherical curvature designed according to the refractive indices of 460nm and 405nm beams (1.49 and 1.51 respectively). The lens center thickness is 5mm, and the effective optical aperture is 10mm. The lens clamping sleeve 3 is made of ABS plastic, and its inner diameter matches the outer diameter of the aspherical lens 4 (interference fit). Its light-emitting end is provided with a stepped surface to fix the plane lens 5. The plane lens 5 is made of high-transmittance optical glass (transmittance ≥95%), with a thickness of 2mm. Its diameter matches the inner diameter of the light-emitting end of the lens clamping sleeve 3. It is fixed to the stepped surface with UV glue. After fixing, the flatness error between its outer end face and the outer end face of the lens clamping sleeve 3 is ≤0.1mm. Machine head housing (1): Made of aluminum alloy, with an internal mounting cavity diameter of 12mm and a length of 30mm, used to accommodate the above components and be compatible with the main unit of the UV curing machine.

[0021] The aspherical lens 4 is cured with UV adhesive and encapsulated with a broadband LED chip group 2. The lens clamping sleeve 3 is fixed to the head housing 1 by threaded connection or snap-fit ​​connection.

[0022] The working principle of the aforementioned working head is as follows: After the circuit board behind the broadband LED chipset 2 is powered through the wire 6, it emits a divergent mixed beam of blue and violet light. The divergent beam is directly incident on the incident surface of the aspherical lens 4. The aspherical lens 4, through its aspherical structure, compensates for the different paths of blue and violet light with different refractive indices. To address the refractive deviation of the two wavelength beams, the precise design of the curvature of the curved surface allows the originally clearly defined blue and violet light spots to be completely fused inside the lens. The beam after being shaped and homogenized by the aspherical lens 4 forms a uniform mixed light spot with clear boundaries and a shape approximately a standard circle. It is then incident perpendicularly on the plane lens 5. After passing through the plane lens 5, the uniform mixed light spot is perpendicularly irradiated onto the photosensitive resin on the tooth surface, exciting the resin monomers to polymerize uniformly and completing the curing process.

Claims

1. A working head for homogenizing the light spot of a broadband photocuring machine, characterized in that, include: The head housing has an internal mounting cavity, with one end being the light-emitting end and the other end used to connect to the main unit of the UV curing machine; A broadband LED chip assembly is fixed to the bottom of the mounting cavity of the head housing and is used to emit a mixed blue-violet light beam; An aspherical lens is disposed on the light-emitting side of the broadband LED chip group; the light-emitting surface of the aspherical lens is aspherical. An optical lens is located on the light-emitting side of the aspherical lens and is fixed to the head housing.

2. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 1, characterized in that, The broadband LED chipset includes at least one blue LED chip and one violet LED chip.

3. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 1, characterized in that, The aspherical curvature of the light-emitting surface of the aspherical lens is designed based on the difference between blue light and violet light.

4. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 1, characterized in that, The optical lens is fixed to the head housing by a lens clamping sleeve or UV adhesive.

5. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 4, characterized in that, The lens clamping sleeve is made of ABS plastic, and its light-emitting end is provided with a stepped surface. The optical lens is fixed to the stepped surface by UV glue, and after fixing, the flatness error between the outer end face of the optical lens and the outer end face of the lens clamping sleeve is ≤0.1mm.

6. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 1, characterized in that, The head housing is made of aluminum alloy, and the diameter of the internal mounting cavity is 10-15mm and the length is 25-35mm.

7. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 4, characterized in that, The aspherical lens is cured with UV adhesive and encapsulated with a broadband LED chip. The lens clamping sleeve is fixed to the head housing by threaded connection or snap-fit ​​connection.

8. The working head for homogenizing the light spot of a broadband photocuring machine according to claim 1, characterized in that, The optical lens is a planar lens or a biconvex lens, with a light transmittance ≥95% and a thickness of 1-3mm.

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