Light supplementing structure
By combining three lenses and using a well-designed focal length for the supplementary lighting structure, the problems of large size and low brightness in existing technologies have been solved, achieving a miniaturized and high-brightness light spot effect, which is suitable for medical testing.
Patent Information
- Application Number
- CN202520183421.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-06
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-02-06
AI Technical Summary
Existing optical supplementary lighting structures are bulky, with small illumination spots and low brightness, which affects the detection effect.
By using a combination of three lenses and rationally setting the focal length and optical power of the lenses, a positive-positive-negative structure is designed. Combined with an aperture to adjust the beam, a miniaturized and high-brightness supplementary lighting structure is achieved.
It achieves a compact supplementary lighting structure that creates a large light spot and high brightness illumination effect, meeting the needs of medical testing.
Smart Images
Figure CN223869065U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to the technical field of optical light supplementing, especially relates to a light supplementing structure. BACKGROUND
[0002] In the medical detection field, a specific part needs to be illuminated by a light supplementing structure to help medical staff to see the patient's pathological part and sampling part, reduce the visual fatigue of medical staff and improve the work efficiency.
[0003] The optical light supplementing structure in the prior art is large in size, and the illumination spot is small and low in brightness, which affects the detection effect. UTILITY MODEL CONTENT
[0004] The utility model provides a light supplementing structure, through reasonable setting the composition mode of lens group, realize small, big and high brightness light supplementing structure of light spot.
[0005] The embodiment of the utility model provides a light supplementing structure, including light source and lens group,
[0006] The lens group includes first lens, second lens and third lens which are sequentially arranged along the optical axis from the object plane to the image plane,
[0007] Wherein, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the lens group is f.
[0008] Wherein, 0.81 < | f1 / f | < 1.81, 0.63 < | f2 / f | < 1.63, 2.39 < | f3 / f | < 3.39.
[0009] Optionally, the power of the lens group is positive.
[0010] Optionally, the power of the first lens is positive, the power of the second lens is positive, and the power of the third lens is negative.
[0011] Optionally, the second lens and the third lens are glued.
[0012] Optionally, the gluing focal length of the second lens and the third lens is f23.
[0013] Wherein, 0.93 < f23 / f < 1.93.
[0014] Optionally, the first lens, the second lens and the third lens are all glass spherical lenses.
[0015] Optionally, the refractive index of the second lens is greater than the refractive index of the first lens and the refractive index of the third lens.
[0016] Optionally, the Abbe number of the first lens is greater than the Abbe number of the second lens, and the Abbe number of the third lens is greater than the Abbe number of the second lens.
[0017] Optionally, the object side surface of the first lens is a concave surface, and the image side surface is a convex surface.
[0018] The object side surface of the second lens is a convex surface, and the image side surface is a convex surface.
[0019] The object side surface of the third lens is a concave surface, and the image side surface is a concave surface.
[0020] Optionally, the lens group further comprises a diaphragm.
[0021] The diaphragm is arranged in the optical path between the third lens and the irradiation surface.
[0022] The light supplementing structure provided by the embodiment of the present application comprises a light source and a lens group, the lens group comprises a first lens, a second lens and a third lens arranged in sequence along an optical axis from an object surface to an image surface, the lens group comprises three lenses by setting, so that the light supplementing structure with small size is facilitated to be realized; and the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens and the focal length f of the lens group satisfy 0.81<|f1 / f|<1.81, 0.63<|f2 / f|<1.63, 2.39<|f3 / f|<3.39, so that the light supplementing structure with large spot area and high brightness can be realized, and the detection requirement is met.
[0023] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS
[0024] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0025] Figure 1 is a structure schematic view of a light supplementing structure provided by the embodiment of the present application;
[0026] Figure 2 is a spot irradiance simulation schematic view of a light supplementing structure provided by the embodiment of the present application;
[0027] Figure 3This is a simulation diagram of the overall effect of a supplementary lighting structure provided in an embodiment of this utility model. Detailed Implementation
[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0029] Example
[0030] Figure 1 This is a schematic diagram of a supplementary lighting structure provided in an embodiment of this utility model, as shown below. Figure 1 As shown, the supplementary lighting structure provided in this embodiment of the present invention includes a light source 10 and a lens group 20. The lens group 20 includes a first lens 201, a second lens 202, and a third lens 203 arranged sequentially along the optical axis from the object plane to the image plane. The focal length of the first lens 201 is f1, the focal length of the second lens 202 is f2, the focal length of the third lens 203 is f3, and the focal length of the lens group is f. The values are: 0.81 < |f1 / f| < 1.81, 0.63 < |f2 / f| < 1.63, and 2.39 < |f3 / f| < 3.39.
[0031] like Figure 1 As shown, the supplementary lighting structure provided in this embodiment of the present invention includes a light source 10 and a lens group 20. The light emitted from the light source 10 is modulated by the lens group 20 before being emitted, thus realizing a supplementary lighting structure with modulated light output. The light source 10 may include a light-emitting diode (LED), an organic light-emitting diode (OLED), or other light-emitting elements.
[0032] Furthermore, the lens group 20 includes elements along the optical axis (e.g., Figure 1 The first lens 201, the second lens 202, and the third lens 203 are arranged sequentially from the object plane to the image plane (in the z-axis direction shown). The arrangement of the three lenses in the lens group 20 ensures that the lens group 20 has a small size, which facilitates the realization of a small and portable supplementary lighting structure.
[0033] Further, the focal length f1 of the first lens 201, the focal length f2 of the second lens 202, the focal length f3 of the third lens 203 and the focal length f of the lens group 20 satisfy 0.81 < |f1 / f| < 1.81, 0.63 < |f2 / f| < 1.63, 2.39 < |f3 / f| < 3.39, by setting the ratio of the focal length of each lens and the focal length of the lens group, the focal length in the lens group 20 can be reasonably distributed, so as to realize a larger spot area and a higher spot brightness.
[0034] Figure 1 Further, the light path of the light rays from the light source 10 through each lens is shown in the figure, it can be seen from the figure that the light rays are emitted from the light source 10, refracted after passing through the lens group 20, and then converge to form a relatively uniform circular spot at the diaphragm 204, and then diffuse outward to realize a larger spot area.
[0035] Exemplarily, Figure 2 is a spot illumination simulation schematic diagram of the light supplementing structure provided by the embodiment of the utility model, Figure 3 is a whole effect simulation schematic diagram of the light supplementing structure provided by the embodiment of the utility model, combined with Figure 2 and Figure 3 , cooperating with the light source with 450 Lumen and the light emitting area of 2.12mm*2.12mm, when the distance between the light source 10 and the lens group 20 is 3.5mm, the light spot with the diameter of 600mm (such as Figure 1 in the z-axis direction of Figure 2 and Figure 3 in the X-axis direction and the Y-axis direction) can be formed on the ground (such as Figure 1 ) at the distance of 525mm, the magnification ratio of the light emitting area of the light source 10 to the ground light spot is 1:200, and the central illumination of the light spot can reach 1700lux, thereby realizing the lighting effect of large light spot and high brightness. Figure 1 It should be noted that, Figure 2 and Figure 3 , the y-axis direction shown in is the same direction as the Y-axis direction shown in Figure 2 and Figure 3 .
[0036] In summary, the light supplementing structure provided by the embodiment of the utility model, by setting the lens group to include three lenses, the light supplementing structure with small size can be realized, and by reasonably setting the focal length f1 of the first lens, the focal length f2 of the second lens, the focal length f3 of the third lens and the focal length f of the lens group to satisfy 0.81 < |f1 / f| < 1.81, 0.63 < |f2 / f| < 1.63, 2.39 < |f3 / f| < 3.39, the light supplementing structure with large spot area and high brightness can be realized, thereby meeting the detection requirements.
[0037] On the basis of the above embodiment, the optical power of the lens group 20 is positive.
[0038] Specifically, the optical power is equal to the difference between the converging degree of the image plane and the converging degree of the object plane, which represents the ability of the optical system to deflect light. The greater the absolute value of the optical power, the stronger the bending ability of the light, and the smaller the absolute value of the optical power, the weaker the bending ability of the light. When the optical power is positive, the refraction of the light is convergent; when the optical power is negative, the refraction of the light is divergent. The optical power can be used to represent a certain refractive surface of a lens (i.e., a surface of the lens), a certain lens, or a system (i.e., a lens group) formed by multiple lenses. In the embodiments of the present application, the object plane and the image plane of the lens group have a conjugate relationship, and the distance between the object plane and the image plane is called the conjugate distance. According to the imaging principle, a lens group 20 with a positive focal length can be used to form a real image with a certain magnification. According to the critical illumination principle, the light emitted by the light source 10 is imaged through the lens group 20 to meet the lighting requirements.
[0039] On the basis of the above-mentioned embodiments, the optical power of the first lens 201 is positive, the optical power of the second lens 202 is positive, and the optical power of the third lens 203 is negative.
[0040] Specifically, the positive-positive-negative optical power combination of the first lens 201, the second lens 202, and the third lens 203 ensures that the positive optical power of the lens group 20 is set. In the embodiments of the present application, the first lens 201 and the second lens 202 are both positive power lenses, and the positive optical power of the lenses can significantly correct the edge aberration of the lens group 20, thereby improving the imaging resolution of the lens group 20. The third lens 203 is a negative power lens, and the negative optical power of the lens can effectively deflect the emitted light, which is conducive to the design of a large target surface.
[0041] For example, when the optical power of the first lens 201 is positive, the focal length f1 of the first lens 201 and the focal length f of the lens group 20 satisfy 0.81 < f1 / f < 1.81, for example, the focal length f1 of the first lens 201 can be 9.2 mm, and the focal length f of the lens group 20 can be 7 mm, f1 / f = 1.31. When the optical power of the second lens 202 is positive, the focal length f2 of the second lens 202 and the focal length f of the lens group 20 satisfy 0.63 < f1 / f < 1.63, for example, the focal length f2 of the second lens 202 can be 7.88 mm, and the focal length f of the lens group 20 can be 7 mm, f2 / f = 1.13. When the optical power of the third lens 203 is negative, the focal length f3 of the third lens 203 and the focal length f of the lens group 20 satisfy -3.39 < f3 / f < -2.39, for example, the focal length f3 of the third lens 203 can be -20.25 mm, and the focal length f of the lens group 20 can be 7 mm, f3 / f = -2.89.
[0042] On the basis of the above-mentioned embodiments, the lens group 20 further comprises a diaphragm 204; the diaphragm 204 is arranged in the light path between the third lens 203 and the irradiation surface.
[0043] Specifically, the lens group 20 further comprises a diaphragm 204; arranging the diaphragm 204 can adjust the propagation direction of the light beam, which is conducive to improving the imaging quality.
[0044] On the basis of the above-mentioned embodiments, the second lens 202 and the third lens 203 are arranged in a glued manner.
[0045] Specifically, the second lens 202 and the third lens 203 are arranged in a glued manner, which can be understood as that the side surface of the second lens 202 close to the image side is arranged in a glued manner with the side surface of the third lens 203 close to the object surface, that is, the image side of the second lens 202 is arranged in a glued manner with the object side of the third lens 203. By arranging the second lens 202 and the third lens 203 in a glued manner, the air gap between the second lens 202 and the third lens 203 can be reduced, which helps to reduce the total optical length of the lens group 20, and also can reduce the tolerance sensitivity problem such as tilt and eccentricity of the lens unit generated in the assembly process, simplify the assembly process in the manufacturing process of the lens group 20 and the light supplementing structure, and improve the equipment efficiency. At the same time, by arranging the second lens 202 and the third lens 203 in a glued manner, the light quantity loss caused by the reflection between the lenses can be reduced, the illumination can be improved, and the ghost risk can be reduced. Further, the glued lens can be used to minimize or eliminate chromatic aberration, and the use of the glued lens in the lens group 20 can improve the image quality and reduce the reflection loss of light energy, thereby improving the image quality. Further, the second lens 202 and the third lens 203 can be glued by means of a gasket or by means of glue, and the specific gluing method is not limited in the embodiments of the present application.
[0046] In the above-mentioned embodiments, the glued focal length of the second lens 202 and the third lens 203 is f23; wherein 0.93 < f23 / f < 1.93. By reasonably setting the glued focal length f23 of the glued lens group and the focal length f of the lens group 20 to satisfy the above range, the setting requirement of the positive focal length of the lens group 20 can be met.
[0047] Specifically, the glued focal length f23 of the second lens 202 and the third lens 203 can be 10.01 mm, and the focal length f of the lens group 20 can be 7 mm, f23 / f = 1.43.
[0048] On the basis of the above-mentioned embodiments, the first lens 201, the second lens 202 and the third lens 203 are all glass spherical lenses.
[0049] Specifically, the spherical lens has a constant curvature from the center of the lens to the periphery of the lens, ensuring that the lens is simple to set. Further, since the thermal expansion coefficient of the glass material lens is small, the stability is good, and therefore the first lens 201, the second lens 202 and the third lens 203 are all glass spherical lenses, and the thermal properties of the glass spherical lens are more stable, and when a large optical power is borne, the lens group 20 can guarantee good resolving power in a wide temperature range. In addition, compared with a plastic aspherical lens, the glass material has a wider selection range, and the refractive index and Abbe number are relatively free to select, which can control the high-order aberration and chromatic aberration of the lens group to a certain extent, and meet the use requirements under complex conditions.
[0050] On the basis of the above embodiment, the refractive index of the second lens 202 is greater than the refractive index of the first lens 201 and greater than the refractive index of the third lens 203.
[0051] Specifically, the refractive index is the ratio of the propagation speed of light in vacuum to the propagation speed of light in the medium, and is mainly used to describe the refractive ability of the material to light. Different materials have different refractive indices. In the embodiment of the utility model, the second lens 102 uses a high-refractive lens, which effectively controls the thickness of the lens while controlling the refraction angle of the light, thereby reducing the product volume.
[0052] On the basis of the above embodiment, the Abbe number of the first lens 201 is greater than the Abbe number of the second lens 202, and the Abbe number of the third lens 203 is greater than the Abbe number of the second lens 203.
[0053] Specifically, the Abbe number is an index used to represent the dispersion ability of a transparent medium. The more serious the dispersion of the medium, the smaller the Abbe number; on the contrary, the lighter the dispersion of the medium, the larger the Abbe number. In the embodiment of the utility model, the first lens 201 and the third lens 203 use high-Abbe-number glass, which can effectively control the chromatic aberration.
[0054] On the basis of the above embodiment, the object side of the first lens 201 is concave, and the image side is convex; the object side of the second lens 202 is convex, and the image side is convex; the object side of the third lens 203 is concave, and the image side is concave.
[0055] Specifically, the object side of the lens can be understood as the surface of the lens close to the object plane, and the image side of the lens can be understood as the surface of the lens close to the image plane. The object side of the first lens 201 is concave, and the image side is convex, which can be understood as the object side of the first lens 201 being concave towards the object plane at the position close to the optical axis, and the image side being convex towards the image plane at the position close to the optical axis, that is, the first lens 201 is a concave-convex lens. The object side of the second lens 202 is convex, and the image side is convex, which can be understood as the object side of the second lens 202 being convex towards the object plane at the position close to the optical axis, and the image side being convex towards the image plane at the position close to the optical axis, that is, the second lens 202 is a double-convex lens. The object side of the third lens 203 is concave, and the image side is concave, which can be understood as the object side of the third lens 203 being concave towards the object plane at the position close to the optical axis, and the image side being concave towards the image plane at the position close to the optical axis, that is, the third lens 203 is a double-concave lens. By reasonably setting the concave-convex conditions of the object side and the image side of each lens, it can be confirmed that the light can smoothly pass through the lens group 20, and the energy loss is reduced. And the setting of the double-convex surface of the second lens 202 and the double-concave surface of the third lens 203 is conducive to the cemented setting of the second lens 202 and the third lens 203.
[0056] As a feasible implementation manner, the specific parameters in the light supplementing structure are described as follows.
[0057] Table 1: An optical design value of the light supplementing structure
[0058]
[0059] Wherein, "S1" represents the object side of the first lens; "S2" represents the image side of the first lens; "S3" represents the object side of the second lens; "S4" represents the image side of the second lens and the object side of the third lens; "S5" represents the image side of the third lens; "STO" represents the diaphragm; and "IMA" represents the illumination surface. The curvature radius represents the bending degree of the lens surface, the positive value represents that the surface is bent towards the illumination surface, and the negative value represents that the surface is bent towards the light source; and the thickness represents the center axial distance from the current surface to the next surface.
[0060] In summary, the light supplementing structure provided by the embodiment of the present application comprises three lenses with optical power, and by reasonably setting the focal length distribution mode, the focal length parameters, the material surface type, the concave-convex condition, the refractive index and the Abbe number and other parameters, a small volume and a large spot, high-illumination effect are achieved.
[0061] The specific embodiments described above do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A supplementary lighting structure, characterized in that, Includes the light source and lens assembly; The lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object plane to the image plane along the optical axis; Wherein, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the lens group is f; Among them, 0.81 < |f1 / f| < 1.81, 0.63 < |f2 / f| < 1.63, and 2.39 < |f3 / f| < 3.
39.
2. The supplementary lighting structure according to claim 1, characterized in that, The optical power of the lens group is positive.
3. The supplementary lighting structure according to claim 2, characterized in that, The first lens has a positive optical power, the second lens has a positive optical power, and the third lens has a negative optical power.
4. The supplementary lighting structure according to claim 1, characterized in that, The second lens and the third lens are cemented together.
5. The supplementary lighting structure according to claim 4, characterized in that, The cemented focal length of the second lens and the third lens is f23; Among them, 0.93 < f23 / f < 1.
93.
6. The supplementary lighting structure according to claim 1, characterized in that, The first lens, the second lens, and the third lens are all glass spherical lenses.
7. The supplementary lighting structure according to claim 1, characterized in that, The refractive index of the second lens is greater than that of the first lens and also greater than that of the third lens.
8. The supplementary lighting structure according to claim 1, characterized in that, The Abbe number of the first lens is greater than that of the second lens, and the Abbe number of the third lens is greater than that of the second lens.
9. The supplementary lighting structure according to claim 1, characterized in that, The object-side surface of the first lens is concave, and the image-side surface is convex. The object-side surface of the second lens is convex, and the image-side surface is also convex. The object-side surface of the third lens is concave, and the image-side surface is also concave.
10. The supplementary lighting structure according to claim 1, characterized in that, The lens group also includes an aperture stop; The aperture is positioned in the optical path between the third lens and the illumination surface.