Glass-plastic mixed optical lens

Abstract

The embodiment of the utility model discloses a glass-plastic hybrid optical lens. The glass-plastic hybrid optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object space to an image space along an optical axis, the first lens, the second lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses, and the third lens and the fourth lens are glass spherical lenses. According to the embodiment of the utility model, through the cooperation of the seven glass-plastic mixed lenses, the imaging quality of the optical lens for light rays with different wavelengths can be improved, the imaging consistency of visible light and infrared light is ensured while chromatic aberration is avoided, and the characteristic of day and night confocal is achieved. Meanwhile, the number of the seven lenses is relatively small, and the size of the whole optical system is relatively small, so that the miniaturization of the whole security lens is facilitated, and the cost and the manufacturing cost are reduced.

Description

Technical Field

[0001] The embodiment of the utility model relates to the technical field of optical lenses, and in particular to a glass-plastic hybrid optical lens. Background Art

[0002] With rising public awareness of security, all-weather monitoring is a must for security lenses. Users increasingly demand consistent image clarity both daytime and nighttime, leading to widespread demand for confocal lenses that combine visible and infrared light. Furthermore, traditional fixed-focus lenses often have a large number of elements, resulting in bulky and heavy lenses that waste manpower and material resources while being inconvenient to use. Excessively large or expensive lenses can hinder product adoption and adoption. Utility Model Content

[0003] The utility model provides a glass-plastic hybrid optical lens to achieve co-focusing of visible light and infrared light of a security lens, while reducing the number of lenses and lowering the cost and manufacturing price to a certain extent.

[0004] The embodiment of the utility model provides a glass-plastic hybrid optical lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis;

[0005] The first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses, and the third lens and the fourth lens are glass spherical lenses.

[0006] Optionally, the object-side surface of the first lens is convex and the image-side surface is concave; the object-side surface of the second lens is concave and the image-side surface is convex.

[0007] Optionally, the object-side surface of the third lens is convex; the object-side surface and the image-side surface of the fourth lens are convex.

[0008] Optionally, the object-side surface of the fifth lens is convex, and the image-side surface is convex; the object-side surface of the sixth lens is concave, and the image-side surface is concave; the object-side surface of the seventh lens is convex, and the image-side surface is convex.

[0009] Optionally, the first lens has negative optical power, and the second lens has negative optical power.

[0010] Optionally, the third lens has positive optical power, and the fourth lens has positive optical power.

[0011] Optionally, the fifth lens has positive optical power, the sixth lens has negative optical power, and the seventh lens has positive optical power.

[0012] Optionally, each lens in the optical lens satisfies the following conditions:

[0013]

[0014] in, is the focal length of the optical lens, is the optical power of the first lens, is the optical power of the second lens, is the focal power of the third lens, is the optical power of the fourth lens, is the optical power of the fifth lens, is the focal power of the sixth lens, is the focal power of the seventh lens.

[0015] Optionally, each lens in the optical lens satisfies the following conditions:

[0016] 1.49≤n1≤1.57;

[0017] 1.45≤n2≤1.76;

[0018] 1.49≤n3≤1.74;

[0019] 1.41≤n4≤1.56;

[0020] 1.55≤n5≤1.67;

[0021] 1.55≤n6≤1.67;

[0022] 1.45≤n7≤1.56;

[0023] Among them, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, and n7 is the refractive index of the seventh lens.

[0024] Optionally, the optical lens further includes a stop, and the stop is located between the third lens and the fourth lens.

[0025] In an embodiment of the present invention, the glass-plastic hybrid optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence along the optical axis from the object side to the image side; the first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses, and the third lens and the fourth lens are glass spherical lenses. This embodiment improves the imaging quality of the optical lens for light of different wavelengths through the coordination between the seven glass-plastic hybrid lenses, while avoiding chromatic aberration and ensuring the imaging consistency of visible light and infrared light, achieving the characteristic of day and night confocality. At the same time, the number of seven lenses is relatively small, and the volume of the entire optical system is relatively small, which is conducive to the miniaturization of the security lens as a whole, and is also conducive to reducing costs and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural schematic diagram of a glass-plastic hybrid optical lens provided in Example 1 of the present utility model;

[0027] Figure 2 yes Figure 1 The spherical aberration curve of the glass-plastic hybrid optical lens shown;

[0028] Figure 3 yes Figure 1 The distortion diagram of the glass-plastic hybrid optical lens shown;

[0029] Figure 4 This is a structural schematic diagram of a glass-plastic hybrid optical lens provided in Example 2 of the present utility model;

[0030] Figure 5 yes Figure 4 The spherical aberration curve of the glass-plastic hybrid optical lens shown;

[0031] Figure 6 yes Figure 4 The distortion diagram of the glass-plastic hybrid optical lens shown;

[0032] Figure 7 This is a structural schematic diagram of a glass-plastic hybrid optical lens provided in Example 3 of the present utility model;

[0033] Figure 8 yes Figure 7 The spherical aberration curve of the glass-plastic hybrid optical lens shown;

[0034] Figure 9 yes Figure 7 The distortion diagram of the glass-plastic hybrid optical lens is shown. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0036] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present invention are described based on the angles shown in the accompanying drawings and should not be understood as limitations on the embodiments of the present invention. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is formed "on" or "under" another element, it can not only be formed directly "on" or "under" another element, but can also be formed indirectly "on" or "under" another element through an intermediate element. The terms "first", "second", etc. are only used for descriptive purposes and do not indicate any order, quantity or importance, but are only used to distinguish different components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] The term "including" and its variations used in the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment".

[0038] It should be noted that the concepts of "first" and "second" mentioned in this utility model are only used to distinguish the corresponding contents, and are not used to limit the order or mutual dependence.

[0039] It should be noted that the modifications of "one" and "multiple" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0040] Figure 1 This is a structural diagram of a glass-plastic hybrid optical lens provided by the first embodiment of the present invention, with reference to Figure 1 The optical 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, and a seventh lens 70, which are arranged in sequence from the object side to the image side along the optical axis;

[0041] The first lens 10 , the second lens 20 , the fifth lens 50 , the sixth lens 60 and the seventh lens 70 are plastic aspherical lenses, and the third lens 30 and the fourth lens 40 are glass spherical lenses.

[0042] First of all, for optical lenses, the focal length is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal length, the stronger the ability to bend light, and the smaller the absolute value of the focal length, the weaker the ability to bend light. When the focal length is a positive number, the refraction of light is convergent; when the focal length is a negative number, the refraction of light is divergent. The focal length can be used to characterize a certain refractive surface of a lens (i.e., a surface of a lens), can be used to characterize a certain lens, and can also be used to characterize a system formed by multiple lenses (i.e., a lens group).

[0043] In the glass-plastic hybrid optical lens provided in this embodiment, each lens can be fixed to a lens barrel ( Figure 1 (not shown) in the Figure 1 As shown, this embodiment utilizes plastic aspheric lenses for the first, second, fifth, sixth, and seventh lenses, while glass spherical lenses for the third and fourth lenses. This effectively replaces the front and rear lenses with plastic aspheric lenses, while the middle lens is a glass spherical lens. The front and rear lenses significantly impact aberrations such as spherical aberration and distortion. By using aspheric lenses, these lenses can effectively correct these aberrations. The middle lens significantly impacts chromatic aberration and other aberrations, significantly impacting day / night confocal performance. By using glass spherical lenses, these aberrations can be mitigated. Thus, this embodiment improves the optical lens's imaging quality for light of different wavelengths by combining the seven glass-plastic hybrid lenses. While avoiding chromatic aberration, it also ensures consistent imaging of visible and infrared light, achieving day / night confocal performance. At the same time, the number of seven lenses is relatively small, and the volume of the entire optical system is relatively small, which is conducive to the overall miniaturization of the security lens and also helps to reduce costs and manufacturing costs.

[0044] In a specific embodiment, optionally, the object-side surface of the first lens 10 is convex, and the image-side surface is concave; the object-side surface of the second lens 20 is concave, and the image-side surface is convex.

[0045] The essence of this embodiment is that both the first lens 10 and the second lens 20 are set as meniscus lenses. The meniscus lens located at the front end can reduce the incident angle of light of the optical lens, improve the relative illumination, and reduce the sensitivity of the lens.

[0046] In a specific embodiment, optionally, the object-side surface of the third lens 30 is convex; the object-side surface and the image-side surface of the fourth lens 40 are convex.

[0047] This embodiment essentially utilizes high-refractive glass spherical lenses for third and fourth lenses 30, 40, to correct for chromatic aberration and enhance infrared confocal capability. Furthermore, the image-side surface of third lens 30 can be a flat surface or a concave or convex surface with a large radius of curvature. This gives third lens 30 a plano-convex or nearly plano-convex design, facilitating processing and reducing costs. Fourth lens 40 is biconvex, facilitating light collection and minimizing chromatic aberration.

[0048] In a specific embodiment, optionally, the object-side surface and the image-side surface of the fifth lens 50 are convex; the object-side surface and the image-side surface of the sixth lens 60 are concave; and the object-side surface and the image-side surface of the seventh lens 70 are convex.

[0049] In a specific embodiment, optionally, the first lens 10 has negative optical power, and the second lens 20 has negative optical power.

[0050] In a specific embodiment, optionally, the third lens 30 has positive refractive power, and the fourth lens 40 has positive refractive power.

[0051] In a specific embodiment, optionally, the fifth lens 50 has positive refractive power, the sixth lens 60 has negative refractive power, and the seventh lens 70 has positive refractive power.

[0052] By rationally setting the optical power of the first through seventh lenses 10 through 70, the coordinated optical power of each lens improves image quality, reduces aberrations, and lowers sensitivity, ensuring smooth light transmission without excessive deflection on any particular surface. Furthermore, the fifth, sixth, and seventh lenses 50, 60, and 70 form a plastic aspheric lens assembly with positive and negative optical power, enhancing image quality, effectively reducing distortion, and reducing costs.

[0053] In a specific embodiment, optionally, each lens in the optical lens satisfies the following conditions:

[0054]

[0055] in, is the optical power of the optical lens, is the optical power of the first lens 10, is the optical power of the second lens 20, is the optical power of the third lens 30, is the optical power of the fourth lens 40, is the optical power of the fifth lens 50, is the optical power of the sixth lens 60, is the optical power of the seventh lens 70.

[0056] In a specific embodiment, optionally, each lens in the optical lens satisfies the following conditions: 1.49≤n1≤1.57; 1.45≤n2≤1.76; 1.49≤n3≤1.74; 1.41≤n4≤1.56; 1.55≤n5≤1.67; 1.55≤n6≤1.67; 1.45≤n7≤1.56; wherein n1 is the refractive index of the first lens 10, n2 is the refractive index of the second lens 20, n3 is the refractive index of the third lens 30, n4 is the refractive index of the fourth lens 40, n5 is the refractive index of the fifth lens 50, n6 is the refractive index of the sixth lens 60, and n7 is the refractive index of the seventh lens 70.

[0057] The above embodiments provide a more specific and reasonable optical power distribution scheme for each lens, which helps to correct various aberrations of the system and improve image quality by matching appropriate refractive index and Abbe number.

[0058] In a specific embodiment, optionally, the optical lens further includes a stop 90 , and the stop 90 is located between the third lens 30 and the fourth lens 40 .

[0059] Those skilled in the art will appreciate that an aperture in an optical system limits the size of the light beam, determining the amount of light that passes through the lens and reaches the photosensitive element. This means it controls the light throughput of the lens, directly determining the aperture size of the optical lens. In this embodiment, the aperture 90 is positioned between the third lens element 30 and the fourth lens element 40. This essentially limits the specific position of the aperture 90 at the waist of the entire optical system, allowing for precise control of light throughput. This increases the height of the central principal ray at the location of the aperture 90, widening the aperture and ensuring the amount of light that passes through the aperture 90, thus ensuring image brightness. Furthermore, the aperture 90 blocks off-axis light, effectively reducing off-axis aberrations and ensuring image clarity.

[0060] In one embodiment, the glass-plastic hybrid lens may further include a filter 80 disposed on the image side of the seventh lens element 70. The filter 80 can filter out unwanted stray light, thereby improving the image quality of the glass-plastic hybrid optical lens. For example, the filter 80 can filter out infrared light during the day to improve the imaging quality of the glass-plastic hybrid optical lens. Furthermore, the filter 80 can protect the imaging sensor.

[0061] In summary, the glass-plastic hybrid optical lens provided in the embodiment of the present invention adopts 7 glass-plastic hybrid lenses. By rationally allocating the material and surface shape of each lens, optimizing the optical power, relative position, center thickness of each lens element and the on-axis spacing between lenses and other parameters, a large field of view, low-cost, infrared confocal optical lens is realized. It can match a 1 / 2.7" target surface sensor chip and has the characteristics of high image quality, large aperture and low cost. Based on the same concept above, the present invention provides three different specific embodiments, and their optical power relationship and related physical optical parameter design range are shown in Table 1: Table 1 The optical power relationship and related physical optical parameter design values ​​of each lens in the three embodiments

[0062]

[0063] refer to Figure 1 The first embodiment of the present invention adopts a glass-plastic hybrid structure of two glass spherical lenses and five plastic aspherical lenses, achieving the following performance parameters: focal length: 3.057mm; aperture: F 1.281; field of view: 130.6°; total optical length: 22.450mm; image plane size:

[0064] like Figure 1 The parameter design values ​​of each lens in the glass-plastic hybrid optical lens of Example 1 are shown in Table 2:

[0065] Table 2 Design values ​​of each lens in the glass-plastic hybrid optical lens in Example 1

[0066]

[0067]

[0068] The surface numbers in Table 2 are numbered according to the surface order of each lens. "STO" represents the aperture of the glass-plastic hybrid optical lens; "IMA" represents the image plane of the glass-plastic hybrid optical 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 plane, and a negative value represents that the surface is bent toward the object plane, where "PL" 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-diameter represents the effective diameter of the light of the lens.

[0069] The aspheric formula is as follows:

[0070]

[0071] Among them, Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate in the direction perpendicular to the optical axis, a i is the coefficient of the higher-order term, a i r 2i is the high-order term of the aspheric surface.

[0072] The even-order coefficients of each aspheric surface in the above embodiment 1 are shown in Table 3:

[0073] Table 3 Aspheric parameters of each lens in the glass-plastic hybrid optical lens in Example 1

[0074]

[0075]

[0076] Among them, 1.961193E-03 means that the coefficient a2 of the surface number S1 is 1.961193*10 -3 , and so on.

[0077] Figure 2 yes Figure 1 The spherical aberration curve of the glass-plastic hybrid optical lens is shown in the figure. The vertical direction represents the normalization of the pupil plane of 0 field of view, 0 represents the center of the pupil, and the vertical vertex represents the vertex of the pupil; the horizontal direction represents the spherical aberration of different wavelengths, in millimeters (mm). The different linear curves in the figure represent different wavelengths of imaging of the system, which are represented by Figure 2 It can be seen that the spherical aberration at different wavelengths is controlled within the range of (-0.035mm, +0.035mm), indicating that the spherical aberration of the glass-plastic hybrid optical lens at each wavelength is well controlled and can meet the needs of wide spectrum applications. This also reflects that the glass-plastic hybrid optical lens has day and night confocal function.

[0078] Figure 3 yes Figure 1 The distortion diagram of the glass-plastic hybrid optical lens is shown in the figure, where the horizontal coordinate represents the magnitude of the distortion in %, and the vertical coordinate represents the normalized image height in units. Figure 3 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is less than 51%, which meets the use requirements of the zoom lens.

[0079] Figure 4 This is a schematic diagram of the structure of a glass-plastic hybrid optical lens provided by the second embodiment of the present invention, with reference to Figure 4 The second embodiment of the present invention adopts a glass-plastic hybrid structure of two glass spherical lenses and five plastic aspherical lenses, achieving the following performance parameters: focal length: 2.842mm; aperture: F 1.205; field of view: 131.2°; total optical length: 22.50mm; image plane size:

[0080] like Figure 4 The parameter design values ​​of each lens in the glass-plastic hybrid optical lens of Example 2 are shown in Table 4:

[0081] Table 4: Design values ​​of each lens in the glass-plastic hybrid optical lens in Example 2

[0082]

[0083] The surface numbers in Table 4 are numbered according to the surface order of each lens, "STO" represents the aperture of the glass-plastic hybrid optical lens; "IMA" represents the image plane of the glass-plastic hybrid optical 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 plane, and a negative value represents that the surface is bent toward the object plane, where "PL" 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-diameter represents the effective diameter of the light of the lens.

[0084] The aspheric formula is as follows:

[0085]

[0086] Among them, Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate in the direction perpendicular to the optical axis, a i is the coefficient of the higher-order term, a i r 2i is the high-order term of the aspheric surface.

[0087] The even-order coefficients of each aspheric surface in the above-mentioned embodiment 2 are shown in Table 5:

[0088] Table 5 Aspheric parameters of each lens in the glass-plastic hybrid optical lens in Example 2

[0089]

[0090]

[0091] Among them, -8.144349E-04 means that the coefficient a2 of the surface number S1 is -8.144349E*10 -4 , and so on.

[0092] Figure 5 yes Figure 4The spherical aberration curve of the glass-plastic hybrid optical lens is shown in the figure. The vertical direction represents the normalization of the pupil plane of 0 field of view, 0 represents the center of the pupil, and the vertical vertex represents the vertex of the pupil; the horizontal direction represents the spherical aberration of different wavelengths, in millimeters (mm). The different linear curves in the figure represent different wavelengths of imaging of the system, which are represented by Figure 5 It can be seen that the spherical aberration at different wavelengths is controlled within the range of (-0.03mm, +0.03mm), indicating that the spherical aberration of the glass-plastic hybrid optical lens at each wavelength is well controlled and can meet the needs of wide spectrum applications. This also reflects that the glass-plastic hybrid optical lens has day and night confocal function.

[0093] Figure 6 yes Figure 4 The distortion diagram of the glass-plastic hybrid optical lens is shown in the figure, where the horizontal coordinate represents the magnitude of the distortion in %, and the vertical coordinate represents the normalized image height in units. Figure 6 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is less than 50%, which meets the use requirements of the zoom lens.

[0094] Figure 7 This is a structural diagram of a glass-plastic hybrid optical lens provided by the third embodiment of the present invention, with reference to Figure 7 The third embodiment of the present invention adopts a glass-plastic hybrid structure of two glass spherical lenses and five plastic aspherical lenses, achieving the following performance parameters: focal length: 2.882mm; aperture: F 1.242; field of view: 127.88°; total optical length: 22.490mm; image plane size:

[0095] like Figure 7 The parameter design values ​​of each lens in the glass-plastic hybrid optical lens of Example 3 are shown in Table 6:

[0096] Table 6: Design values ​​of each lens in the glass-plastic hybrid optical lens in Example 3

[0097]

[0098] The surface numbers in Table 6 are numbered according to the surface order of each lens, "STO" represents the aperture of the glass-plastic hybrid optical lens; "IMA" represents the image plane of the glass-plastic hybrid optical 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 plane, and a negative value represents that the surface is bent toward the object plane, where "PL" 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-diameter represents the effective diameter of the light of the lens.

[0099] The aspheric formula is as follows:

[0100]

[0101] Among them, Z is the sagittal height of the aspheric surface, c is the basic curvature at the vertex, k is the conic constant, r is the radial coordinate in the direction perpendicular to the optical axis, a i is the coefficient of the higher-order term, a i r 2i is the high-order term of the aspheric surface.

[0102] The even-order coefficients of each aspheric surface in the third embodiment are shown in Table 7:

[0103] Table 7 Aspheric parameters of each lens in the glass-plastic hybrid optical lens in Example 3

[0104]

[0105]

[0106] Among them, -5.407875E-05 means that the coefficient a2 of the surface number S1 is -5.407875E*10 -5 , and so on.

[0107] Figure 8 yes Figure 7 The spherical aberration curve of the glass-plastic hybrid optical lens is shown in the figure. The vertical direction represents the normalization of the pupil plane of 0 field of view, 0 represents the center of the pupil, and the vertical vertex represents the vertex of the pupil; the horizontal direction represents the spherical aberration of different wavelengths, in millimeters (mm). The different linear curves in the figure represent different wavelengths of imaging of the system, which are represented by Figure 8 It can be seen that the spherical aberration at different wavelengths is controlled within the range of (-0.04mm, +0.04mm), indicating that the spherical aberration of the glass-plastic hybrid optical lens at each wavelength is well controlled and can meet the needs of wide spectrum applications. This also reflects that the glass-plastic hybrid optical lens has day and night confocal function.

[0108] Figure 9 yes Figure 7 The distortion diagram of the glass-plastic hybrid optical lens is shown in the figure, where the horizontal coordinate represents the magnitude of the distortion in %, and the vertical coordinate represents the normalized image height in units. Figure 9 It can be seen that the distortion of the lens provided in this embodiment is well corrected, and the imaging distortion is less than 45%, which meets the use requirements of the zoom lens.

[0109] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A glass-plastic hybrid optical lens, characterized in that: The lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, which are arranged in sequence from the object side to the image side along the optical axis; The first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens are plastic aspherical lenses, and the third lens and the fourth lens are glass spherical lenses.

2. The optical lens according to claim 1, wherein: The object-side surface of the first lens is convex, and the image-side surface is concave; the object-side surface of the second lens is concave, and the image-side surface is convex.

3. The optical lens according to claim 1, wherein: The object-side surface of the third lens is convex; the object-side surface and the image-side surface of the fourth lens are convex.

4. The optical lens according to claim 1, wherein: The object-side surface of the fifth lens is convex, and the image-side surface is convex; the object-side surface of the sixth lens is concave, and the image-side surface is concave; the object-side surface of the seventh lens is convex, and the image-side surface is convex.

5. The optical lens according to claim 1, wherein: The first lens has negative refractive power, and the second lens has negative refractive power.

6. The optical lens according to claim 1, wherein: The third lens has positive refractive power, and the fourth lens has positive refractive power.

7. The optical lens according to claim 1, wherein: The fifth lens has positive refractive power, the sixth lens has negative refractive power, and the seventh lens has positive refractive power.

8. The optical lens according to claim 1, wherein: Each lens in the optical lens meets the following conditions: -0.649<φ1 / φ<-0.332; -0.413<φ2 / φ<-0.126; 0.13<φ3 / φ<0.33; 0.2<φ4 / φ<0.429; 0.165<φ5 / φ<0.576; -0.745<φ6 / φ<-0.514; 0.413<φ7 / φ<0.695; Among them, φ is the optical focal power of the optical lens, φ1 is the optical focal power of the first lens, φ2 is the optical focal power of the second lens, φ3 is the optical focal power of the third lens, φ4 is the optical focal power of the fourth lens, φ5 is the optical focal power of the fifth lens, φ6 is the optical focal power of the sixth lens, and φ7 is the optical focal power of the seventh lens.

9. The optical lens according to claim 1, wherein: Each lens in the optical lens meets the following conditions: 1.49≤n1≤1.57； 1.45≤n2≤1.76； 1.49≤n3≤1.74； 1.41≤n4≤1.56； 1.55≤n5≤1.67； 1.55≤n6≤1.67； 1.45≤n7≤1.56； Among them, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, n3 is the refractive index of the third lens, n4 is the refractive index of the fourth lens, n5 is the refractive index of the fifth lens, n6 is the refractive index of the sixth lens, and n7 is the refractive index of the seventh lens.

10. The optical lens according to claim 1, wherein: The optical lens further includes a stop, and the stop is located between the third lens and the fourth lens.

Images