Prime lens

Abstract

The invention discloses a prime lens. The prime lens comprises a first lens to a tenth lens which are sequentially arranged from an object space to an image space along an optical axis; the first lens is a glass lens with negative focal power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive focal power, and the sixth lens is a glass lens or a plastic lens with positive focal power. The seventh lens is a glass lens with negative focal power, the eighth lens is a glass lens with positive focal power, the ninth lens is a plastic lens, the tenth lens is a plastic lens, and the number of the glass lenses and the number of the plastic lenses are both five. The prime lens provided by the invention adopts a 5G5P optical system structure, and meets the requirements of large aperture, ultra wide angle, infrared confocal and short total length by optimizing the shape and focal power of each lens and the relative position of each lens.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a fixed-focus lens. Background Art

[0002] With the advancement of technology and the development of 5G (fifth generation mobile communications), all walks of life have put forward higher requirements for lens performance in all aspects. Since small aperture cannot meet the needs of low-light shooting environment, large aperture has become the trend of photographic lens products. At present, a series of large aperture products have appeared on the market, but there are very few lenses that can meet the requirements of large aperture, infrared confocal and ultra-wide angle at the same time. Summary of the invention

[0003] The present invention provides a fixed-focus lens, which adopts an optical system structure of 5 glass lenses and 5 plastic lenses (5G5P), and finally realizes a lens design with large aperture, ultra-wide angle, infrared confocality and short total length by optimizing the shape, optical focal length and relative position of each lens; the fixed-focus lens has an aperture number of 1.08-1.15, a total optical length less than or equal to 22.5 mm, and a maximum field of view angle of 151.9°, which meets the requirements of large aperture, ultra-wide angle, infrared confocality and short total length.

[0004] According to one aspect of the present invention, there is provided a fixed-focus lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from an object side to an image side along an optical axis;

[0005] Among them, the first lens is a glass lens with negative optical power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, the eighth lens is a glass lens with positive optical power, the ninth lens is a plastic lens, and the tenth lens is a plastic lens, and the number of the glass lenses and the number of the plastic lenses are both five.

[0006] Optionally, the glass lenses are all spherical lenses, and the plastic lenses are all aspherical lenses.

[0007] Optionally, the first lens and the second lens satisfy:

[0008] -0.561≤Φ1 / Φ≤-0.450;

[0009] -0.158≤Φ2 / Φ≤0.037;

[0010] 34.00 <Vd1<43.00;

[0011] Wherein, Φ1 represents the optical power of the first lens, Φ2 represents the optical power of the second lens, Φ represents the optical power of the fixed-focus lens as a whole, and Vd1 represents the Abbe number of the first lens.

[0012] Optionally, the first lens is a convex-concave glass spherical lens, and the second lens is a concave-convex plastic aspherical lens.

[0013] Optionally, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy:

[0014] -0.038≤Φ3 / Φ≤0.296;

[0015] -0.158≤Φ4 / Φ≤0.333;

[0016] 0.128≤Φ5 / Φ≤0.271;

[0017] 0.143≤Φ6 / Φ≤0.525;

[0018] -0.970≤Φ7 / Φ≤-0.523;

[0019] 0.578≤Φ8 / Φ≤0.771;

[0020] 16.08≤Vd3≤67.71;

[0021] 1.4974≤Nd4≤1.9484;

[0022] 20.28≤Vd4≤58.93;

[0023] 1.5906≤Nd5≤1.9399;

[0024] 16.08≤Vd5≤67.70;

[0025] 3.12≤Vd8-Vd6≤52.32;

[0026] 25.07≤Vd7≤29.9;

[0027] Among them, Φ3, Φ4, Φ5, Φ6, Φ7 and Φ8 respectively represent the focal power of the third lens, the focal power of the fourth lens, the focal power of the fifth lens, the focal power of the sixth lens, the focal power of the seventh lens and the focal power of the eighth lens; Φ represents the focal power of the fixed-focus lens as a whole; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6 and Vd7 respectively represent the Abbe number of the third lens, the refractive index of the fourth lens, the Abbe number of the fourth lens, the refractive index of the fifth lens, the Abbe number of the fifth lens, the Abbe number of the eighth lens minus the Abbe number of the sixth lens and the Abbe number of the seventh lens.

[0028] Optionally, the third lens is a plastic aspheric lens or a glass spherical lens with a convex object side surface, the fourth lens is a glass spherical lens or a plastic aspheric lens with a convex image side surface, the fifth lens is a biconvex glass spherical lens or a plastic aspheric lens, the sixth lens is a biconvex glass spherical lens or a plastic aspheric lens, the seventh lens is a glass spherical lens with a concave image side surface, and the eighth lens is a biconvex glass spherical lens.

[0029] Optionally, the optical powers of the ninth lens and the tenth lens satisfy:

[0030] -0.919≤Φ9 / Φ≤0.332;

[0031] -0.194≤Φ10 / Φ≤0.639;

[0032] Among them, Φ9 represents the optical angle of the ninth lens, Φ10 represents the optical focal length of the tenth lens, and Φ represents the optical focal length of the fixed-focus lens as a whole.

[0033] Optionally, the ninth lens is a plastic aspheric lens, and the tenth lens is a plastic aspheric lens.

[0034] Optionally, the aperture number range of the fixed-focus lens is 1.08-1.15, and the total optical length of the fixed-focus lens is less than or equal to 22.5 mm.

[0035] Optionally, a filter is also included, and the filter is located between the tenth lens and the image plane.

[0036] The fixed-focus lens provided by the embodiment of the present invention comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from the object side to the image side along the optical axis; wherein the first lens is a glass lens with negative optical power, and the second lens is a plastic lens, which is conducive to the realization of the ultra-wide angle of the system; the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, and the eighth lens is a glass lens with positive optical power. The third lens to the eighth lens can reduce the high-level The amount of spherical aberration introduced can correct chromatic aberration, which is conducive to the realization of large aperture, infrared confocality and short total length; the ninth lens is a plastic lens and the tenth lens is a plastic lens, which can reduce the angle of light reaching the image plane to ensure that the relative illumination of the imaging picture is high, and is conducive to aberration correction and resolution; the number of glass lenses and plastic lenses are both five, adopting the 5G5P optical system structure, and by optimizing the shape, optical focal length and relative position of each lens, finally realizing the lens design of large aperture, ultra-wide angle, infrared confocality and short total length; the fixed-focus lens has an aperture number of 1.08-1.15, a total optical length less than or equal to 22.5mm, and a maximum field of view angle of 151.9°, which meets the requirements of large aperture, ultra-wide angle, infrared confocality and short total length.

[0037] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 A schematic structural diagram of a fixed-focus lens provided by an embodiment of the present invention;

[0040] Figure 2 is a schematic diagram of an axial aberration curve of Example 1;

[0041] Figure 3 A schematic structural diagram of another fixed-focus lens provided by an embodiment of the present invention;

[0042] Figure 4 is a schematic diagram of an axial aberration curve of Example 2;

[0043] Figure 5 A schematic structural diagram of another fixed-focus lens provided by an embodiment of the present invention;

[0044] Figure 6 is a schematic diagram of an axial aberration curve of Example 3;

[0045] Figure 7 A schematic structural diagram of another fixed-focus lens provided by an embodiment of the present invention;

[0046] Figure 8 This is a schematic diagram of the axial aberration curve of Example 4. DETAILED DESCRIPTION

[0047] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0048] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0049] Figure 1 A schematic diagram of the structure of a fixed-focus lens provided by an embodiment of the present invention, referring to Figure 1The fixed-focus lens comprises a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60, a seventh lens 70, an eighth lens 80, a ninth lens 90 and a tenth lens 100 which are arranged in sequence from the object side to the image side along the optical axis; wherein the first lens 10 is a glass lens with negative power, the second lens 20 is a plastic lens, the third lens 30 is a plastic lens or a glass lens, the fourth lens 40 is a glass lens or a plastic lens, the fifth lens 50 is a glass lens or a plastic lens with positive power, the sixth lens 60 is a glass lens or a plastic lens with positive power, the seventh lens 70 is a glass lens with negative power, the eighth lens 80 is a glass lens with positive power, the ninth lens 90 is a plastic lens, and the tenth lens 100 is a plastic lens, and the number of the glass lenses and the number of the plastic lenses are both five.

[0050] It can be understood that the focal power is the reciprocal of the focal length, and characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power, the stronger the ability to bend light, and the smaller the absolute value of the focal power, the weaker the ability to bend light. When the focal power is a positive number, the refraction of light is convergent; when the focal power is a negative number, the refraction of light is divergent. Optionally, glass lenses are all spherical lenses, and plastic lenses are all aspherical lenses. Glass lenses are easy to process and have better thermal stability. Plastic lenses are low in cost. Plastic aspherical lenses have better aberration correction effects. Designing a glass-plastic hybrid structure can compensate for each other. The use of glass lenses and plastic lenses in fixed-focus lenses can better balance the resolution of the lens and improve the imaging effect. By setting the combination of the first lens 10 and the second lens 20 with a negative light angle, more light is ensured to enter the fixed-focus lens, which is beneficial to the realization of the ultra-wide angle of the system; by setting the optical power combination of the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80, the amount of introduction of high-order spherical aberration can be reduced, chromatic aberration can be corrected, and it is beneficial to the realization of large aperture, infrared confocality and short total length; by setting the ninth lens 90 and the tenth lens 100 to be plastic lenses, the angle of light reaching the image plane is reduced, the relative illumination of the imaging picture is guaranteed to be high, and it is beneficial to aberration correction and resolution; by reasonably designing the shape, optical power and relative position of each lens, an aperture number of 1.08 to 1.15, an optical total length less than or equal to 22.5 mm, and a maximum field angle of 151.9° are finally achieved, meeting the requirements of large aperture, ultra-wide angle, infrared confocality and short total length.

[0051] Optionally, the fixed-focus lens also includes an aperture, which is located on the object surface of a lens and can be used to block far-axis light, better correct high-order aberrations, and improve image quality.

[0052] Optional, continue to refer to Figure 1The fixed-focus lens further includes a filter 110 , and the filter 110 is located between the tenth lens 100 and the image plane.

[0053] The filter 110 can filter out the light outside the optical band of the imaging light to improve the imaging quality. In specific implementation, the filtering wavelength of the filter 110 can be designed according to actual conditions.

[0054] Optionally, the first lens 10 and the second lens 20 satisfy:

[0055] -0.561≤Φ1 / Φ≤-0.450;

[0056] -0.158≤Φ2 / Φ≤0.037;

[0057] 34.00 <Vd1<43.00;

[0058] Wherein, Φ1 represents the optical power of the first lens 10 , Φ2 represents the optical power of the second lens 20 , Φ represents the optical power of the fixed-focus lens as a whole, and Vd1 represents the Abbe number of the first lens 10 .

[0059] Optionally, the first lens 10 is a convex-concave glass spherical lens, and the second lens 20 is a concave-convex plastic aspherical lens.

[0060] By setting the first lens 10 and the second lens 20 to meet the above conditions, it is beneficial to achieve an ultra-wide angle of the system.

[0061] Optionally, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80 satisfy:

[0062] -0.038≤Φ3 / Φ≤0.296;

[0063] -0.158≤Φ4 / Φ≤0.333;

[0064] 0.128≤Φ5 / Φ≤0.271;

[0065] 0.143≤Φ6 / Φ≤0.525;

[0066] -0.970≤Φ7 / Φ≤-0.523;

[0067] 0.578≤Φ8 / Φ≤0.771;

[0068] 16.08≤Vd3≤67.71;

[0069] 1.4974≤Nd4≤1.9484;

[0070] 20.28≤Vd4≤58.93;

[0071] 1.5906≤Nd5≤1.9399;

[0072] 16.08≤Vd5≤67.70;

[0073] 3.12≤Vd8-Vd6≤52.32;

[0074] 25.07≤Vd7≤29.9;

[0075] Among them, Φ3, Φ4, Φ5, Φ6, Φ7 and Φ8 respectively represent the focal power of the third lens 30, the focal power of the fourth lens 40, the focal power of the fifth lens 50, the focal power of the sixth lens 60, the focal power of the seventh lens 70 and the focal power of the eighth lens 80; Φ represents the focal power of the fixed-focus lens as a whole; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6 and Vd7 respectively represent the Abbe number of the third lens 30, the refractive index of the fourth lens 40, the Abbe number of the fourth lens 40, the refractive index of the fifth lens 50, the Abbe number of the fifth lens 50, the Abbe number of the eighth lens 80 minus the Abbe number of the sixth lens 60 and the Abbe number of the seventh lens 70.

[0076] Optionally, the third lens 30 is a plastic aspheric lens or a glass spherical lens with a convex object side surface, the fourth lens 40 is a glass spherical lens or a plastic aspheric lens with a convex image side surface, the fifth lens 50 is a biconvex glass spherical lens or a plastic aspheric lens, the sixth lens 60 is a biconvex glass spherical lens or a plastic aspheric lens, the seventh lens 70 is a glass spherical lens with a concave image side surface, and the eighth lens is a biconvex glass spherical lens.

[0077] When the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60, the seventh lens 70 and the eighth lens 80 meet this range, the amount of introduction of high-order spherical aberration can be reduced, chromatic aberration can be corrected, and it is conducive to the realization of large aperture, infrared confocal and short total length. Among them, the seventh lens 70 and the eighth lens 80 form a double cemented lens, or the sixth lens 60, the seventh lens 70 and the eighth lens 80 form a cemented lens, and the cemented lens composed of the sixth lens 60, the seventh lens 70 and the eighth lens 80 can be bonded by glue or supported by a spacer.

[0078] Optionally, the optical power of the ninth lens 90 and the tenth lens 100 satisfies:

[0079] -0.919≤Φ9 / Φ≤0.332;

[0080] -0.194≤Φ10 / Φ≤0.639;

[0081] Here, Φ9 represents the optical angle of the ninth lens 90, Φ10 represents the optical power of the tenth lens 100, and Φ represents the optical power of the entire fixed-focus lens.

[0082] Optionally, the ninth lens 90 is a plastic aspheric lens, and the tenth lens 100 is a plastic aspheric lens.

[0083] When the ninth lens element 90 and the tenth lens element 100 meet the above range, the angle of light reaching the image plane can be reduced, thereby ensuring a high relative illumination of the imaged picture, facilitating aberration correction, and ensuring resolution.

[0084] By reasonably allocating parameters such as the material, optical focal length, center thickness of each lens, and on-axis spacing between lenses, the aberration of the lens in the wavelength range of 436nm to 850nm can be reasonably corrected and balanced, so that the above-mentioned fixed-focus lens system can achieve at least one beneficial effect such as large aperture, ultra-wide angle, infrared confocal, etc.

[0085] In this embodiment, the surface of the aspheric lens satisfies the following formula:

[0086]

[0087] Among them, z is the axial vector height of the aspheric surface in the Z direction; r is the height of the aspheric surface; c is the curvature of the fitted sphere, which is the inverse of the radius of curvature; k is the fitted cone coefficient; A, B, C, D, E, F, and G are the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order coefficients of the aspheric polynomial, respectively.

[0088] For example, Table 1 shows Figure 1 Specific parameters of the corresponding fixed-focus lens:

[0089] Table 1 Specific parameters of fixed focus lens

[0090] Scope of protection Example 1 Lower limit Upper limit Φ1 / Φ -0.552 -0.561 -0.450 Φ2 / Φ -0.107 -0.158 0.037 Φ3 / Φ 0.270 -0.038 0.296 Φ4 / Φ -0.122 -0.158 0.333 Φ5 / Φ 0.239 0.128 0.271 Φ6 / Φ 0.380 0.143 0.525 Φ7 / Φ -0.755 -0.970 -0.523 Φ8 / Φ 0.594 0.578 0.771 Φ9 / Φ -0.201 -0.919 0.332 Φ10 / Φ 0.263 -0.194 0.639 Nd4 1.5351 1.4974 1.9484 Nd5 1.9108 1.5906 1.9399 Vd1 40.73 34.00 43.00 Vd3 20.80 16.08 67.71 Vd4 55.71 20.28 58.93 Vd5 35.25 16.08 67.70 Vd8-Vd6 5.22 3.12 52.32 Vd7 25.48 25.07 29.90

[0091] Table 2 shows the parameter data of each lens in Example 1. Example 1 can achieve a focal length of f=2.985mm, an aperture number F#=1.086, and an image plane Fixed focus lens with field of view FOV = 151.15°.

[0092] Table 2 Design values ​​of optical physical parameters of the fixed focus lens of Example 1

[0093]

[0094]

[0095] The surface numbers are numbered according to the order of the surfaces of each lens, S12 and S13 are cemented surfaces, "OBJ" represents the object surface of the fixed-focus lens; "STO" represents the aperture of the fixed-focus lens, which is set at S11; "IMA" represents the image surface of the fixed-focus lens; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "Infinity" represents that the surface is a plane, the radius of curvature is infinite, and the distance is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and a blank space represents that the current position is air; the semi-aperture represents the effective diameter of the light of the lens; the k value represents the numerical value of the conic coefficient of the aspheric surface.

[0096] Table 3 shows the design values ​​of the aspheric parameters in Example 1:

[0097]

[0098]

[0099] Table 3

[0100] Surface number E F G S3 3.8653E-08 6.9723E-09 -4.3989E-10 S4 5.2545E-07 -1.8700E-08 1.7780E-10 S5 2.1999E-07 -7.3010E-09 7.5257E-11 S6 -6.0824E-09 -1.1313E-10 1.0027E-11 S7 -2.6832E-08 -3.3701E-10 3.3870E-11 S8 -1.5341E-08 1.2802E-09 -3.5228E-11 S15 -1.3477E-07 5.2882E-09 1.4619E-11 S16 -8.0258E-09 -5.5081E-09 2.6906E-10 S17 2.5694E-07 -3.6236E-09 -8.3773E-11 S18 3.3054E-08 -4.5156E-09 2.8930E-10

[0101] Among them, -8.5590E-04 means that the A coefficient of surface number S3 is -8.5590E×10 -4 .

[0102] Figure 2 The axial aberration curve of Example 1 is shown in FIG. 1 . The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius. The horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different color curves in the figure represent different wavelengths of the system imaging. Figure 2 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens at each wavelength are well controlled and can meet the needs of wide spectrum applications.

[0103] Figure 3 A schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention. Table 4 is a schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention. Figure 3 Specific parameters of the corresponding fixed-focus lens:

[0104] Table 4 Specific parameters of fixed focus lens

[0105]

[0106]

[0107] Table 5 shows the parameter data of each lens in Example 2. Example 2 can achieve a focal length of f=2.969 mm, an aperture number F#=1.150, and an image plane Fixed focus lens with field of view FOV = 151.93°.

[0108] Table 5 Design values ​​of optical physical parameters of the fixed focus lens of Example 2

[0109]

[0110]

[0111] The surface numbers are numbered according to the order of the surfaces of each lens, S14 is the bonding surface, "OBJ" represents the object surface of the fixed-focus lens; "STO" represents the aperture of the fixed-focus lens, which is set at S9; "IMA" represents the image surface of the fixed-focus lens; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "Infinity" represents that the surface is a plane, the radius of curvature is infinite, and the distance is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and a blank space represents that the current position is air; the semi-aperture represents the effective diameter of the light of the lens; the k value represents the numerical value of the cone coefficient of the aspheric surface.

[0112] Table 6 shows the design values ​​of the aspheric parameters in Example 2:

[0113]

[0114]

[0115] Table 6

[0116] Surface number E F G S3 -1.0082E-08 6.8662E-09 -2.3290E-10 S4 5.1213E-07 -2.7349E-08 6.4480E-10 S7 -3.6033E-08 -1.0147E-09 1.1966E-10 S8 -3.2343E-08 7.4009E-10 8.9291E-12 S11 1.6814E-07 -7.5846E-09 1.6163E-10 S12 1.3391E-09 -8.7646E-10 4.6947E-11 S16 4.7729E-06 -8.3019E-07 4.1664E-08 S17 -7.5091E-08 -1.0358E-07 8.2725E-09 S18 -2.8291E-07 -1.7148E-07 1.2638E-08 S19 1.6948E-06 -2.4678E-07 1.3041E-08

[0117] Among them, -5.3849E-04 means that the A coefficient of surface number S3 is -5.3849×10 -4 .

[0118] Figure 4 Schematic diagram of axial aberration curve of Example 2. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different color curves in the figure represent different wavelengths of system imaging, which are represented by Figure 4It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens at each wavelength are well controlled and can meet the needs of wide spectrum applications.

[0119] Figure 5 A schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention. Table 7 is a schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention. Figure 5 Specific parameters of the corresponding fixed-focus lens:

[0120] Table 7 Specific parameters of fixed-focus lenses

[0121]

[0122]

[0123] Table 8 shows the parameter data of each lens in Example 3. Example 3 can achieve a focal length of f=2.976mm, an aperture number F#=1.083, and an image plane Fixed focus lens with field of view FOV = 151.4°.

[0124] Table 8 Design values ​​of optical physical parameters of the fixed focus lens of Example 3

[0125]

[0126]

[0127] The surface numbers are numbered according to the order of the surfaces of each lens, S12 and S13 are cemented surfaces, "OBJ" represents the object surface of the fixed-focus lens; "STO" represents the aperture of the fixed-focus lens, which is set at S11; "IMA" represents the image surface of the fixed-focus lens; the radius of curvature represents the curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "Infinity" represents that the surface is a plane, the radius of curvature is infinite, and the distance is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and a blank space represents that the current position is air; the semi-aperture represents the effective diameter of the light of the lens; the k value represents the numerical value of the conic coefficient of the aspheric surface.

[0128] Table 9 shows the design values ​​of the aspheric parameters in Example 3:

[0129] Surface number A B C D S3 -1.495616E-03 2.167066E-04 -4.298448E-06 -9.507184E-07 S4 3.787460E-03 -3.155335E-05 3.644356E-05 -5.737729E-06 S5 -1.199874E-04 -1.588626E-05 1.474267E-06 -6.083735E-10 S6 -5.680208E-05 1.408778E-05 2.373569E-07 2.106396E-09 S9 1.761518E-04 -9.491499E-07 2.599117E-07 4.011682E-09 S10 -1.177728E-04 3.791393E-06 4.653426E-07 -2.660611E-09 S15 -5.641394E-04 -1.149469E-04 -4.280682E-06 -8.890076E-09 S16 1.447811E-03 -8.181737E-05 7.284303E-06 1.192556E-07 S17 -2.830871E-03 4.936886E-05 6.444983E-06 -4.271942E-07 S18 -2.515761E-03 -6.289748E-05 1.021694E-05 -8.282016E-08

[0130] Table 9

[0131]

[0132]

[0133] Among them, -1.495616E-03 means that the A coefficient of surface number S3 is -1.495616×10 -3 .

[0134] Figure 6 The axial aberration curve diagram of Example 3, the vertical direction represents the normalized aperture, 0 represents the optical axis, the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, the unit is millimeter (mm). The different color curves in the figure represent different wavelengths of system imaging, Figure 6 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens at each wavelength are well controlled and can meet the needs of wide spectrum applications.

[0135] Figure 7 A schematic diagram of the structure of another fixed-focus lens provided in an embodiment of the present invention. For example, Table 10 is a schematic diagram of the structure of a fixed-focus lens provided in an embodiment of the present invention. Figure 7 Specific parameters of the corresponding fixed-focus lens:

[0136] Table 10 Specific parameters of fixed focus lens

[0137]

[0138]

[0139] Table 11 shows the parameter data of each lens in Example 4. Example 4 can achieve a focal length of f=3.007 mm, an aperture number F#=1.089, and an image plane Fixed focus lens with field of view FOV = 150.36°.

[0140] Table 11 Design values ​​of optical physical parameters of the fixed focus lens of Example 4

[0141]

[0142]

[0143] The surface numbers are numbered according to the order of the surfaces of each lens, S12 and S13 are cemented surfaces, "OBJ" represents the object surface of the fixed-focus lens; "STO" represents the aperture of the fixed-focus lens, which is set at S4; "IMA" represents the image surface of the fixed-focus lens; the radius of curvature represents the degree of curvature of the lens surface, a positive value represents that the surface is bent toward the image side, and a negative value represents that the surface is bent toward the object side, where "Infinity" represents that the surface is a plane, the radius of curvature is infinite, and the distance is infinite; the thickness represents the central axial distance from the current surface to the next surface, the refractive index represents the ability of the material between the current surface and the next surface to deflect light, and a blank space represents that the current position is air, and the refractive index is 1; the Abbe number represents the dispersion characteristics of the material between the current surface and the next surface to light, and a blank space represents that the current position is air; the semi-aperture represents the effective diameter of the light of the lens; the k value represents the numerical value of the conic coefficient of the aspheric surface.

[0144] Table 12 shows the design values ​​of the aspheric parameters in Example 4:

[0145] Surface number A B C D S3 -1.5015E-03 2.1447E-04 -3.8142E-06 -9.7576E-07 S4 3.7754E-03 -3.0024E-05 3.6381E-05 -5.7394E-06 S5 -1.0586E-04 -1.6558E-05 1.5535E-06 -1.5819E-10 S6 -5.8125E-05 1.4053E-05 2.3236E-07 2.0319E-09 S9 1.6236E-04 -8.9946E-07 2.4116E-07 3.2472E-09 S10 -1.1324E-04 3.7176E-06 4.6615E-07 -2.6629E-09 S15 -5.9152E-04 -9.0814E-05 -4.1795E-06 -2.2219E-08 S16 1.7157E-03 -4.1316E-05 5.1652E-06 5.8746E-08 S17 -2.6826E-03 2.2675E-05 8.5573E-06 -2.0882E-07 S18 -2.6261E-03 -7.4968E-05 1.0180E-05 1.9805E-08

[0146] Table 12

[0147]

[0148]

[0149] Among them, -1.5015E-03 means that the A coefficient of surface number S3 is -1.5015×10 -3 .

[0150] Figure 8 Schematic diagram of axial aberration curve of Example 4. The vertical direction represents the normalized aperture, 0 represents the optical axis, and the vertical vertex represents the maximum pupil radius; the horizontal direction represents the offset relative to the ideal focus, in millimeters (mm). The different color curves in the figure represent different wavelengths of system imaging, which are represented by Figure 8 It can be seen that the axial aberrations of different wavelengths are all controlled within the range of (-0.05mm, +0.05mm), indicating that the aberrations of this fixed-focus lens at each wavelength are well controlled and can meet the needs of wide spectrum applications.

[0151] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art 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 invention should be included in the protection scope of the present invention.

Claims

1. A fixed-focus lens, characterized in that: It includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens which are arranged in sequence from the object side to the image side along the optical axis; Among them, the first lens is a glass lens with negative optical power, the second lens is a plastic lens, the third lens is a plastic lens or a glass lens, the fourth lens is a glass lens or a plastic lens, the fifth lens is a glass lens or a plastic lens with positive optical power, the sixth lens is a glass lens or a plastic lens with positive optical power, the seventh lens is a glass lens with negative optical power, the eighth lens is a glass lens with positive optical power, the ninth lens is a plastic lens, and the tenth lens is a plastic lens, and the number of the glass lenses and the number of the plastic lenses are both five.

2. The fixed-focus lens according to claim 1, characterized in that: The glass lenses are all spherical lenses, and the plastic lenses are all aspherical lenses.

3. The fixed-focus lens according to claim 1, characterized in that: The first lens and the second lens satisfy: -0.561≤Φ1 / Φ≤-0.450; -0.158≤Φ2 / Φ≤0.037; 34.00 <Vd1<43.00; Wherein, Φ1 represents the optical power of the first lens, Φ2 represents the optical power of the second lens, Φ represents the optical power of the fixed-focus lens as a whole, and Vd1 represents the Abbe number of the first lens.

4. The fixed-focus lens according to claim 3, characterized in that: The first lens is a convex-concave glass spherical lens, and the second lens is a concave-convex plastic aspherical lens.

5. The fixed-focus lens according to claim 1, wherein: The third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens satisfy: -0.038≤Φ3 / Φ≤0.296; -0.158≤Φ4 / Φ≤0.333; 0.128≤Φ5 / Φ≤0.271; 0.143≤Φ6 / Φ≤0.525; -0.970≤Φ7 / Φ≤-0.523; 0.578≤Φ8 / Φ≤0.771; 16.08≤Vd3≤67.71; 1.4974≤Nd4≤1.9484; 20.28≤Vd4≤58.93; 1.5906≤Nd5≤1.9399; 16.08≤Vd5≤67.70; 3.12≤Vd8-Vd6≤52.32; 25.07≤Vd7≤29.9; Among them, Φ3, Φ4, Φ5, Φ6, Φ7 and Φ8 respectively represent the focal power of the third lens, the focal power of the fourth lens, the focal power of the fifth lens, the focal power of the sixth lens, the focal power of the seventh lens and the focal power of the eighth lens; Φ represents the focal power of the fixed-focus lens as a whole; Vd3, Nd4, Vd4, Nd5, Vd5, Vd8-Vd6 and Vd7 respectively represent the Abbe number of the third lens, the refractive index of the fourth lens, the Abbe number of the fourth lens, the refractive index of the fifth lens, the Abbe number of the fifth lens, the Abbe number of the eighth lens minus the Abbe number of the sixth lens and the Abbe number of the seventh lens.

6. The fixed-focus lens according to claim 5, characterized in that: The third lens is a plastic aspheric lens or a glass spherical lens with a convex object side surface, the fourth lens is a glass spherical lens or a plastic aspheric lens with a convex image side surface, the fifth lens is a biconvex glass spherical lens or a plastic aspheric lens, the sixth lens is a biconvex glass spherical lens or a plastic aspheric lens, the seventh lens is a glass spherical lens with a concave image side surface, and the eighth lens is a biconvex glass spherical lens.

7. The fixed-focus lens according to claim 1, wherein: The optical powers of the ninth lens and the tenth lens satisfy: -0.919≤Φ9 / Φ≤0.332; -0.194≤Φ10 / Φ≤0.639; Among them, Φ9 represents the optical angle of the ninth lens, Φ10 represents the optical focal length of the tenth lens, and Φ represents the optical focal length of the fixed-focus lens as a whole.

8. The fixed-focus lens according to claim 7, characterized in that: The ninth lens is a plastic aspheric lens, and the tenth lens is a plastic aspheric lens.

9. The fixed-focus lens according to claim 1, wherein: The aperture number range of the fixed-focus lens is 1.08-1.15, and the total optical length of the fixed-focus lens is less than or equal to 22.5 mm.

10. The fixed-focus lens according to claim 1, wherein: It also includes a filter, which is located between the tenth lens and the image plane.

Images