Optical lens

Abstract

The utility model provides a kind of optical lens, from object side to image side sequentially includes first lens, second lens and third lens along optical axis.The first lens has positive refractive power, and has first surface and second surface.The second lens has third surface and fourth surface, and the third lens has fifth surface and sixth surface.The first surface, third surface and fifth surface are object side surface, and the second surface, fourth surface and sixth surface are image side surface.The first surface of the first lens towards object side is convex.The first lens, second lens and third lens satisfy the relationship.

Description

Technical Field

[0001] This utility model relates to an optical device, and more particularly to an optical lens. Background Technology

[0002] Optical lenses can be divided into projection lenses and image-capturing lenses. Projection lenses project the image generated by the display element onto a screen or the retina of the human eye, while image-capturing lenses image the external scene onto an image sensor. Image-capturing lenses can be further divided into fixed-focus image-capturing lenses and zoom image-capturing lenses. With the advancement of optoelectronic technology, imaging devices such as projectors, digital camcorders, and digital cameras have been widely used in daily life. One of the core components of these imaging devices is the optical lens. By adjusting the optical lens, the image is clearly focused on the screen or image sensor to form an image; therefore, image quality is closely related to the optical quality of the optical lens.

[0003] Confocal microscopy plays a crucial role in precision measurement, life sciences, semiconductor inspection, and industrial quality control. Traditional confocal lenses typically employ high-resolution designs to acquire detailed image information. However, high-resolution systems often come with high costs, heavy data processing burdens, and relatively low scanning speeds, making them less than optimal for certain applications (such as large-area scanning, real-time monitoring, or low-cost devices). Utility Model Content

[0004] This invention relates to an optical lens that has better imaging performance, while reducing cost and computational burden and is suitable for large-area scanning.

[0005] An embodiment of this utility model provides an optical lens. The optical lens, from the object side to the image side along the optical axis, sequentially includes: a first lens, a second lens, and a third lens. The first lens has positive refractive power and has a first surface and a second surface. The second lens has positive or negative refractive power and has a third surface and a fourth surface. The third lens has positive or negative refractive power and has a fifth surface and a sixth surface. The first, third, and fifth surfaces are object-side surfaces facing the object side, and the second, fourth, and sixth surfaces are image-side surfaces facing the image side. The first surface of the first lens facing the object side is convex, and an aperture is disposed on one side of the first surface. The first, second, and third lenses all satisfy the following relationship:

[0006]

[0007] Where f is the effective focal length of the optical lens, and R i Let T be the aspherical radius of curvature of the object-side surface of the i-th lens. i Let S be the thickness of the i-th lens. iLet be the effective optical radius of the object side of the i-th lens, where i is 1, 2, or 3.

[0008] Based on the above, in the optical lens of the embodiment of this utility model, the optical lens includes a first lens, a second lens, and a third lens, each lens having an image-side surface and an object-side surface. As mentioned earlier, the object-side surface of the first lens is a first surface, the image-side surface is a second surface, and the first surface of the first lens is a convex surface. Furthermore, the optical lens of the embodiment of this utility model conforms to the mathematical formula...

[0009] In this case, the value of the defocus modulation transfer function of the optical lens can be effectively controlled. This optimizes imaging performance while reducing cost and computational burden, and is suitable for large-area scanning.

[0010] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are described below, and detailed descriptions are provided in conjunction with the accompanying drawings. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of an optical lens according to an embodiment of the present invention.

[0012] Figure 2A This is a utility model Figure 1 Field curvature diagram of the optical lens in the embodiment.

[0013] Figure 2B This is a utility model Figure 1 Distortion diagram of the optical lens in the embodiment.

[0014] Figure 3 This is a utility model Figure 1 The optical lens of the embodiment is exposed to infrared light with a wavelength of 940 nanometers at a temperature of 20°C. The defocus modulation transfer function curve is shown in the figure.

[0015] Figure 4 This is a utility model Figure 1 The optical lens of the embodiment is at a temperature of 20°C, and the defocus modulation transfer function curve of visible light is shown.

[0016] Figure 5 This is a utility model Figure 1 The optical lens of the embodiment is shown in the defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers when the lens is at a temperature of 0°C.

[0017] Figure 6 This is a utility model Figure 1 The defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers at a temperature of 40°C is shown in the embodiment.

[0018] Figure 7This is a cross-sectional schematic diagram of an optical lens according to another embodiment of the present invention.

[0019] Figure 8A This is a utility model Figure 7 Field curvature diagram of the optical lens in the embodiment.

[0020] Figure 8B This is a utility model Figure 7 Distortion diagram of the optical lens in the embodiment.

[0021] Figure 9 This is a utility model Figure 7 The optical lens of the embodiment is exposed to infrared light with a wavelength of 940 nanometers at a temperature of 20°C. The defocus modulation transfer function curve is shown in the figure.

[0022] Figure 10 This is a utility model Figure 7 The optical lens of the embodiment is at a temperature of 20°C, and the defocus modulation transfer function curve of visible light is shown.

[0023] Figure 11 This is a utility model Figure 7 The optical lens of the embodiment is shown in the defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers when the lens is at a temperature of 0°C.

[0024] Figure 12 This is a utility model Figure 7 The defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers at a temperature of 40°C is shown in the embodiment.

[0025] Figure 13 This is a cross-sectional schematic diagram of an optical lens according to another embodiment of the present invention.

[0026] Figure 14A This is a utility model Figure 13 Field curvature diagram of the optical lens in the embodiment.

[0027] Figure 14B This is a utility model Figure 13 Distortion diagram of the optical lens in the embodiment.

[0028] Figure 15 This is a utility model Figure 13 The optical lens of the embodiment is exposed to infrared light with a wavelength of 940 nanometers at a temperature of 20°C. The defocus modulation transfer function curve is shown in the figure.

[0029] Figure 16 This is a utility model Figure 13 The optical lens of the embodiment is at a temperature of 20°C, and the defocus modulation transfer function curve of visible light is shown.

[0030] Figure 17 This is a utility model Figure 13 The optical lens of the embodiment is shown in the defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers when the lens is at a temperature of 0°C.

[0031] Figure 18 This is a utility model Figure 13 The defocus modulation transfer function curve of infrared light with a wavelength of 940 nanometers at a temperature of 40°C is shown in the embodiment. Detailed Implementation

[0032] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same element symbols are used in the drawings and description to denote the same or similar parts.

[0033] The foregoing and other descriptions and effects of this utility model will be clearly presented in the following detailed description of the embodiments with reference to the accompanying drawings.

[0034] This invention provides an optical lens. In embodiments of this invention, the optical lens may be, for example, a confocal optical lens for infrared and visible light. Furthermore, in embodiments of this invention, the confocal optical lens for infrared and visible light may be a low-resolution confocal lens.

[0035] In one embodiment of this invention, an optical lens for confocal infrared and visible light is provided, wherein the infrared light has a single frequency and a wavelength of 940 nanometers, and the 940-nanometer wavelength of the infrared light is used as the focusing reference. Furthermore, in this embodiment of the optical lens for confocal infrared and visible light, the focusing error between the infrared and visible light is less than one-hundredth of the diagonal radius of the image sensor. The following paragraphs will describe the optical lenses of various embodiments of this invention in detail.

[0036] Figure 1 This is a cross-sectional schematic diagram of an optical lens 1 according to an embodiment of the present invention. Figure 1 As shown, the optical lens 1 includes a first lens L1, a second lens L2, and a third lens L3 sequentially along the optical axis OA from the object side to the image side. The first lens L1 has positive refractive power and has a first surface B1 and a second surface B2. The second lens L2 has a third surface B3 and a fourth surface B4, and the third lens L3 has a fifth surface B5 and a sixth surface B6. The second lens L2 can have positive or negative refractive power, and the third lens L3 can have positive or negative refractive power. In one embodiment, the first surface B1 of the first lens L1 facing the object side is convex. In this embodiment, the second lens L2 has positive refractive power, the second surface B2 is convex, the third surface B3 is concave, the fourth surface B4 is convex, and the third lens L3 has negative refractive power.

[0037] In this embodiment, the first surface B1, the third surface B3, and the fifth surface B5 are object-side surfaces facing the object side, and the second surface B2, the fourth surface B4, and the sixth surface B6 are image-side surfaces facing the image side. In one embodiment of this invention, an aperture 10 may also be provided on one side of the first lens L1, for example in... Figure 1 In this embodiment, an aperture 10 is provided on the object-side surface (i.e., the first surface B1) of the first lens L1. Furthermore, a filter F may also be provided on one side of the image-side surface (i.e., the sixth surface B6) of the third lens L3. The filter F may be, for example, an infrared cut-off filter (IRCF), but this invention is not limited thereto.

[0038] Table 1 below corresponds to the optical data of the optical lens 1 in this embodiment of the present invention, including the radius of curvature, thickness, effective radius (i.e., half of the effective optical diameter), and conic coefficient of the aperture 10 (corresponding to surface B0 in Table 1), the first surface B1, the second surface B2, the third surface B3, the fourth surface B4, the fifth surface B5, the sixth surface B6, and the filter F (in Table 1, the infrared cut-off filter), as well as the refractive indices of the first lens L1, the second lens L2, and the third lens L3. Furthermore, in Table 1, the seventh surface B7 represents the object-side surface of the filter F, the eighth surface B8 represents the image-side surface of the filter F, and the ninth surface B9 is the imaging surface, which may be, for example, the sensing surface of an image sensor.

[0039] Table 1

[0040]

[0041] For example, as shown in Table 1, a reference surface is also defined in this embodiment (referring to the values ​​in the first column), and the radius of curvature of the first surface B1 is 7.94 × 10⁻⁶. -1 mm, the thickness of the column for the first surface B1 represents the distance between this surface (i.e., the first surface B1) and the next surface (i.e., the second surface B2) on the optical axis OA, which is 4.9 × 10 mm. -1 mm, the thickness of the column of the second surface B2 represents the distance (i.e., air gap) between this surface (i.e., the second surface B2) and the next surface (i.e., the third surface B3) on the optical axis OA, and the effective radius of the column of the first surface B1 is 4.30 × 10 mm. -1 The data ranges are mm, with a cone index of -49.9 and a refractive index of 1.54 for the first lens L1, and so on for other fields. It should be noted that the data ranges listed in this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0042] In the embodiments of this utility model, the first surface B1, the third surface B3, and the fifth surface B5 on the object side of the first lens L1, the second lens L2, and the third lens L3, and the second surface B2, the fourth surface B4, and the sixth surface B6 on the image side are all aspheric surfaces, and these aspheric surfaces are defined according to the following formula (1):

[0043]

[0044] Where r is the distance between a point on the aspherical curve and the optical axis OA, z(r) is the aspherical depth, i.e., the perpendicular distance between a point on the aspherical surface at a distance r from the optical axis OA and the tangent plane at the vertex of the aspherical surface on the optical axis OA. R is the radius of curvature of the lens surface near the optical axis OA, K is the cone coefficient, and A 2n is the 2nth order aspherical coefficient, where n is a positive integer.

[0045] Table 2 lists the aspherical coefficients of the first surface B1 to the sixth surface B6 of the optical lens 1 according to this embodiment of the present invention. Table 2 shows the first eight aspherical coefficients, namely A2, A4, A6, A8, A... 10 A 12 A 14 And A 16 .

[0046] Table 2

[0047]

[0048] As can be seen in Table 2, the aspheric coefficient A2 values ​​corresponding to the first surface B1 to the sixth surface B6 are all zero.

[0049] Figure 2A This is the field curvature of the optical lens 1 in this embodiment of the present invention. Figure 2B This is a distortion diagram of the optical lens 1 according to an embodiment of the present invention. Figure 2A and Figure 2B This is a simulated data graph created using light with a wavelength of 555nm. Among them, Figure 2A The horizontal axis represents the distance from the focal plane (in millimeters), while the vertical axis ranges from 0 to the maximum half-field angle. Figure 2A The maximum half-field of view is 42.399°. Figure 2B In the diagram, the horizontal axis represents the percentage of distortion, and the vertical axis represents the range from 0 to the maximum half-field of view. Figure 2B The maximum half-field of view is 42.399°. Furthermore, in... Figure 2AIn the diagram, curve S represents data in the sagittal direction, while curve T represents data in the tangential direction.

[0050] Figure 3 , Figure 5 as well as Figure 6 These are defocus modulation transfer function curves of infrared light with a wavelength of 940 nanometers at different temperatures for an optical lens 1 according to an embodiment of this utility model. Figure 4 This is a graph showing the defocus modulation transfer function of the optical lens 1 according to an embodiment of the present invention at visible light wavelengths. Figures 3 to 6 The vertical axis represents the modulus of the optical transfer function (OTF), also known as the through-focus modulation transfer function (MTF), and the horizontal axis represents the focus shift, measured in millimeters (mm). The spatial frequency is 63 cycles / mm. Figure 3 , Figure 5 as well as Figure 6 It can be seen that when optical lens 1 is at temperatures of 20℃, 0℃, and 40℃, and with zero focus shift, the modulus of its optical transfer function is greater than 0.7. Next, we see... Figure 4 . Figure 4 The optical lens 1 is located at a temperature of 20°C and a spatial frequency of 63 cycles / mm, with zero focus offset. Figure 4 The modulus of its optical transfer function is also greater than 0.7, and its optical transfer function modulus can be maintained at a certain level, allowing optical lens 1 to maintain good image quality even at different temperatures. Furthermore, Figure 4 and Figure 3 , Figure 5 as well as Figure 6 The peak values ​​of the optical transfer function modulus all fall within the range of -0.01 mm to 0.01 mm of the focal offset. Therefore, with Figure 3 With 940 nm infrared light as a reference at 20 °C, for optical lens 1, visible light and 940 nm infrared light can be considered as confocal.

[0051] Figure 7 This is a cross-sectional schematic diagram of the optical lens 2 according to another embodiment of the present invention. Please refer to... Figure 7 In this embodiment, the optical lens 2 and Figure 1Similar to optical lens 1, the main difference between the two lies in their optical parameters. Table 3 below shows the optical data corresponding to optical lens 2 in this embodiment of the invention, as follows:

[0052] Table 3

[0053]

[0054] The interpretation method for Table 3 is the same as that for Table 1, so it will not be elaborated further.

[0055] It should be noted that the data ranges listed in the table of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0056] Table 4 lists the aspherical coefficients of the first surface B1 to the sixth surface B6 of the optical lens 2 according to this embodiment of the present invention. Table 2 shows the first eight aspherical coefficients, namely A2, A4, A6, A8, A... 10 A 12 A 14 And A 16 .

[0057] Table 4 is as follows:

[0058]

[0059] As can be seen in Table 4, the aspheric coefficient A2 values ​​corresponding to the first surface B1 to the sixth surface B6 are all zero.

[0060] Figure 8A and Figure 8B The field curvature diagram and distortion diagram correspond to the optical lens 2 in the embodiments of this utility model, respectively. Figure 9 , Figure 11 as well as Figure 12 These are defocus modulation transfer function curves of infrared light with a wavelength of 940 nanometers at different temperatures for an optical lens 2 according to an embodiment of this utility model. Figure 10 This is a graph showing the defocus modulation transfer function of the optical lens 2 according to an embodiment of the present invention at visible light wavelengths. Figure 9 , Figure 10 , Figure 11 as well as Figure 12 The spatial frequency is 63 cycles / mm.

[0061] Figure 8A and Figure 8B This is a simulated data graph created using light with a wavelength of 555nm. In Figure 8A The maximum half-field of view is 42.397°. Figure 8B The largest half-field of view is 42.397°. Furthermore, in... Figure 8AIn the diagram, curve S represents the data in the sagittal direction, while curve T represents the data in the meridional direction.

[0062] Please refer to Figure 9 , Figure 11 as well as Figure 12 It can be seen that when the optical lens 2 is at a temperature of 20℃, 0℃ and 40℃ respectively, and the focal offset is zero, the modulus of its optical transfer function is greater than 0.7. Figure 10 When the optical lens 2 is at a temperature of 20°C and the focus shift is zero, the modulus of its optical transfer function is still greater than 0.7. The modulus of its optical transfer function can be maintained at a certain level, allowing the optical lens 2 to maintain good image quality even at different temperatures. Furthermore, Figure 10 and Figure 9 , Figure 11 as well as Figure 12 The peak values ​​of the optical transfer function modulus all fall within the range of -0.01 mm to 0.01 mm of the focal offset. Therefore, with Figure 9 With infrared light of 940 nm wavelength at 20 °C as a reference, for optical lens 2, visible light and infrared light of 940 nm wavelength can be considered as confocal.

[0063] Figure 13 This is a cross-sectional schematic diagram of the optical lens 3 according to another embodiment of the present invention. Please refer to... Figure 13 In this embodiment, the optical lens 3 and Figure 1 Similar to optical lens 1, the main difference between the two lies in their optical parameters. Table 5 below shows the optical data corresponding to optical lens 3 in this embodiment of the invention, as shown in Table 5 below:

[0064] Table 5

[0065]

[0066] The interpretation method for Table 5 is the same as that for Table 1, so it will not be elaborated further.

[0067] It should be noted that the data ranges listed in the table of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model.

[0068] Table 6 lists the aspherical coefficients of the first surface B1 to the sixth surface B6 of the optical lens 3 according to this embodiment of the invention. Table 6 shows the first eight aspherical coefficients, namely A2, A4, A6, A8, A... 10 A 12 A 14 And A 16 .

[0069] Table 6

[0070]

[0071] As can be seen in Table 6, the aspheric coefficient A2 values ​​corresponding to the first surface B1 to the sixth surface B6 are all zero.

[0072] Figure 14A and Figure 14B These are the field curvature diagram and distortion diagram of the optical lens 3 in the embodiments of this utility model. Figure 15 , Figure 17 as well as Figure 18 These are defocus modulation transfer function curves of infrared light with a wavelength of 940 nanometers at different temperatures for an optical lens 3 according to an embodiment of this utility model. Figure 16 This is a graph showing the defocus modulation transfer function of the optical lens 3 according to an embodiment of the present invention at visible light wavelengths. Figure 15 , Figure 16 , Figure 17 as well as Figure 18 The spatial frequency is 63 cycles / mm.

[0073] Figure 14A and Figure 14B This is a simulated data graph created using light with a wavelength of 555nm. In Figure 14A The maximum half-field angle is 42.052°. Figure 14B The maximum half-field angle is 42.052°. Furthermore, in... Figure 14A In the diagram, curve S represents the data in the sagittal direction, while curve T represents the data in the meridional direction.

[0074] Please refer to Figure 15 , Figure 17 as well as Figure 18 It can be seen that when optical lens 3 is at temperatures of 20℃, 0℃, and 40℃, and with zero focus shift, the modulus of its optical transfer function is greater than 0.7. Next, we see... Figure 16 . Figure 16 When the optical lens 3 is at a temperature of 20°C and the focus shift is zero, the modulus of its optical transfer function is still greater than 0.7. The modulus of its optical transfer function can be maintained at a certain level, allowing the optical lens 3 to maintain good image quality even at different temperatures. Furthermore, Figure 16 and Figure 15 , Figure 17 as well as Figure 18 The peak values ​​of the optical transfer function modulus all fall within the range of -0.01 mm to 0.01 mm of the focal offset. Therefore, with Figure 15 With infrared light of 940 nm wavelength at 20 °C as a reference, for optical lens 3, visible light and infrared light of 940 nm wavelength can be considered as confocal.

[0075] The following paragraphs will explain the relationships satisfied by the aforementioned optical lenses 1 to 3, and the variables controlled by each relationship.

[0076] In the embodiments of this utility model, the first lens L1, the second lens L2, and the third lens L3 of optical lenses 1-3 all satisfy the following relationship:

[0077]

[0078] Where f is the effective focal length of optical lenses 1 to 3, and R i Let T be the aspherical radius of curvature of the object-side surface of the i-th lens. i Let S be the thickness of the i-th lens. i Let be the effective optical radius of the object-side surface of the i-th lens, where i is 1, 2, or 3. For example, when i equals 1, the i-th lens refers to the first lens L1.

[0079] In one embodiment of this utility model, the first lens L1, the second lens L2, and the third lens L3 all satisfy the following relationship:

[0080]

[0081] Among them, Rf i With Rb i Let be the radius of curvature of the object side and the radius of curvature of the image side of the i-th lens, respectively.

[0082] In one embodiment of this utility model, the first lens L1, the second lens L2, and the third lens L3 all satisfy the following relationship:

[0083] 0.63<cos((π·n i ·f) / (10(Sf i +T i )))<0.73

[0084] Where, n i Let Sf be the refractive index of the i-th lens. i Let be the effective optical radius of the object side surface of the i-th lens.

[0085] In one embodiment of this utility model, the first lens L1, the second lens L2, and the third lens L3 all satisfy the following relationship:

[0086] 0.04 < (10·Ti·(n) i -1)) / (V i ·f 0.3 ) < 0.11

[0087] Among them, V iLet L be the Abbe number of the i-th lens. Through this mathematical formula, the degree of dispersion of the first lens L1, the second lens L2, and the third lens L3 in this embodiment of the invention can be effectively controlled.

[0088] In one embodiment of this utility model, the first lens L1, the second lens L2, and the third lens L3 all satisfy the following relationship:

[0089] 0.08 < 10tanh((V) i ·T i ) / (30f))-(Sf i / 100)<0.17

[0090] The symbols used in this mathematical formula have already been explained and will not be elaborated upon again. By satisfying this mathematical formula, the influence of temperature drift can be effectively controlled. That is, when optical lenses 1 to 3 are subject to temperature changes, the influence of thermal drift on the performance of optical lenses 1 to 3 can be effectively suppressed.

[0091] In one embodiment of this utility model, the first lens L1, the second lens L2, and the third lens L3 all satisfy the following relationship:

[0092] 0<sin(2π·(|R' i | / f))<1

[0093] Where R' i Let be the radius of curvature of either the object-side surface or the image-side surface of the i-th lens. This mathematical relationship allows for effective control of the light spot size.

[0094] In summary, the optical lens of this embodiment includes a first lens, a second lens, and a third lens, and each lens has an image-side surface and an object-side surface. As mentioned above, the object-side surface of the first lens is a first surface, the image-side surface is a second surface, and the first surface of the first lens is convex. Furthermore, the optical lens of this embodiment conforms to the mathematical formula...

[0095] Under these conditions, the value of the defocus modulation transfer function of the optical lens can be effectively controlled. This optimizes imaging performance while reducing cost and computational burden, and makes it suitable for large-scale scanning, thus enabling applications such as industrial online inspection, biomedical imaging, 3D surface imaging, and education and research.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An optical lens, characterized in that, From the object side to the image side along the optical axis, the following are included in sequence: A first lens has positive diopter, and the first lens has a first surface and a second surface. The first surface of the first lens facing the object is convex, and an aperture is provided on one side of the first surface. The second lens has positive or negative refractive power and has a third and a fourth surface; and A third lens has positive or negative refractive power and has a fifth and a sixth surface, wherein the first, third, and fifth surfaces are object-side surfaces facing the object, and the second, fourth, and sixth surfaces are image-side surfaces facing the image, and the first, second, and third lenses satisfy the following relationship: Where f is the effective focal length of the optical lens, and R i Let T be the aspherical radius of curvature of the object side surface of the i-th lens. i S is the thickness of the i-th lens. i Let i be the effective optical radius of the object side surface of the i-th lens, where i is 1, 2, or 3.

2. The optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens all satisfy the following relationship: Among them, Rf i With Rb i These are the radius of curvature of the object side and the radius of curvature of the image side of the i-th lens, respectively.

3. The optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens all satisfy the following relationship: 0.63<cos((π·n i ·f) / (10(Sf i +T i )))<0.73 Where, n i Let Sf be the refractive index of the i-th lens. i Let be the effective optical radius of the object side surface of the i-th lens.

4. The optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens all satisfy the following relationship: 0.04<(10·T i ·(n i -1)) / (V i ·f 0.3 )<0.11 Where, n i Let V be the refractive index of the i-th lens. i Let be the Abbe number of the i-th lens.

5. The optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens all satisfy the following relationship: 0.08<10tanh((V i ·T i ) / (30f))-(Sf i / 100)<0.17 Among them, V i Let Sf be the Abbe number of the i-th lens. i Let be the effective optical radius of the object side surface of the i-th lens.

6. The optical lens according to claim 1, characterized in that, The first lens, the second lens, and the third lens all satisfy the following relationship: 0<sin(2π·(|R' i | / f))<1 Where R' i Let be the aspherical radius of curvature of either the object side surface or the image side surface of the i-th lens.

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