Optical lens

Abstract

The application provides an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with positive refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative refractive power, the object side of which is a convex surface and the image side of which is a concave surface; a third lens with negative refractive power; a fourth lens with negative refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a concave surface near the optical axis; a fifth lens with positive refractive power, the object side of which is a convex surface near the optical axis and the image side of which is a convex surface; a sixth lens with positive refractive power; a seventh lens with negative refractive power, the object side of which is a concave surface and the image side of which is a concave surface near the optical axis; and the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy 1.1 < TTL / f < 1.3. The optical lens provided by the application can improve the imaging quality of the optical lens through specific surface shape matching and reasonable refractive power distribution, and has the advantages of excellent imaging quality.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] With the prevalence of remote work and online education, video conferencing has become an indispensable part of people's daily lives and work. The quality of video conferencing depends largely on the optical lens used, which places higher demands on video conferencing lenses. For example, to provide clear video quality, video conferencing lenses generally need to provide high resolution, such as 1080p or 4K. For another example, to effectively capture participants in a conference room, video conferencing lenses are often required to better blur the background and highlight the main subject. To provide good video quality even in low-light environments, video conferencing lenses are generally required to have a large aperture. Traditional video conferencing lenses have more or less certain limitations, such as low resolution and poor imaging in low-light or dim environments. Therefore, there is an urgent need to provide an optical lens that can meet the needs of video conferencing. Summary of the Invention

[0003] In view of the above problems, an object of the present invention is to provide an optical lens having the advantage of excellent imaging quality.

[0004] The present invention provides an optical lens, comprising seven lenses, which include the following lenses in order from the object side to the imaging surface along the optical axis:

[0005] The first lens has positive refractive power, its object-side surface is convex and its image-side surface is concave;

[0006] a second lens having negative optical power, the object-side surface of which is convex and the image-side surface of which is concave;

[0007] a third lens having negative optical power;

[0008] a fourth lens element having negative optical power, whose object-side surface is convex near the optical axis and whose image-side surface is concave near the optical axis;

[0009] The fifth lens element has positive refractive power, its object-side surface is convex near the optical axis, and its image-side surface is convex;

[0010] a sixth lens having positive optical power;

[0011] The seventh lens element has a negative optical power, its object-side surface is concave, and its image-side surface is concave near the optical axis;

[0012] The total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy the following conditions: 1.1 <TTL / f<1.3。

[0013] It is further preferred that the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 4.1mm < f / Fno < 4.6mm.

[0014] It is further preferred that the Abbe number Vd1 of the first lens satisfy: Vd1 > 80; the Abbe number Vd1 of the first lens and the Abbe number Vd3 of the third lens satisfy: 23 < Vd1-Vd3 < 59.

[0015] It is further preferred that the combined focal length f123 of the first lens, the second lens and the third lens and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, the central thickness CT3 of the third lens satisfy: 3.2 < f123 / (CT1+CT2+CT3) < 3.7.

[0016] It is further preferred that the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f1234 / f < 1.8.

[0017] It is further preferred that the total track length TTL of the optical lens and the real image height ih corresponding to the maximum half field angle of the optical lens satisfy: 1.5 < TTL / ih < 1.8.

[0018] It is further preferred that the sum ∑CT of the central thicknesses of the first lens to the seventh lens along the optical axis and the distance TD of the object side surface of the first lens to the image side surface of the seventh lens on the optical axis satisfy: 0.6 < ∑CT / TD < 0.8.

[0019] It is further preferred that the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens and the interval CT56 of the fifth lens and the sixth lens on the optical axis satisfy: 15 < (CT4+CT5) / CT56 < 27.

[0020] It is further preferred that the effective focal length f of the optical lens and the central thickness CT6 of the sixth lens, the interval CT67 of the sixth lens and the seventh lens on the optical axis, the central thickness CT7 of the seventh lens satisfy: 3.2 < f / (CT6+CT67+CT7) < 4.2.

[0021] It is further preferred that the seventh lens image side end half clear aperture CSD72 and the seventh lens image side end half clear aperture sagittal height SAGX72 satisfy: 4.5 < |CSD72 / SAGX72| < 12.

[0022] Compared with the prior art, the optical lens provided by the application adopts seven lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of miniaturization, large aperture, large image height, high pixels, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the following drawings, in which:

[0024] Figure 1 It is a structural schematic diagram of the optical lens in embodiment 1 of the application.

[0025] Figure 2 It is an astigmatism curve diagram of the optical lens in embodiment 1 of the application.

[0026] Figure 3 It is an F~Tan(Theta) distortion curve diagram of the optical lens in embodiment 1 of the application.

[0027] Figure 4 It is an axial aberration curve diagram of the optical lens in embodiment 1 of the application.

[0028] Figure 5 It is a lateral chromatic aberration curve diagram of the optical lens in embodiment 1 of the application.

[0029] Figure 6 It is a structural schematic diagram of the optical lens in embodiment 2 of the application.

[0030] Figure 7 It is an astigmatism curve diagram of the optical lens in embodiment 2 of the application.

[0031] Figure 8 It is an F~Tan(Theta) distortion curve diagram of the optical lens in embodiment 2 of the application.

[0032] Figure 9 It is an axial aberration curve diagram of the optical lens in embodiment 2 of the application.

[0033] Figure 10 It is a lateral chromatic aberration curve diagram of the optical lens in embodiment 2 of the application.

[0034] Figure 11 It is a structural schematic diagram of the optical lens in embodiment 3 of the application.

[0035] Figure 12 It is an astigmatism curve diagram of the optical lens in embodiment 3 of the application.

[0036] Figure 13F~Tan(Theta) distortion curve of the optical lens in Embodiment 3 of the present application.

[0037] Figure 14 Axial aberration curve of the optical lens in Embodiment 3 of the present application.

[0038] Figure 15 Vignetting curve of the optical lens in Embodiment 3 of the present application.

[0039] Figure 16 Structure diagram of the optical lens in Embodiment 4 of the present application.

[0040] Figure 17 Astigmatism curve of the optical lens in Embodiment 4 of the present application.

[0041] Figure 18 F~Tan(Theta) distortion curve of the optical lens in Embodiment 4 of the present application.

[0042] Figure 19 Axial aberration curve of the optical lens in Embodiment 4 of the present application.

[0043] Figure 20 Vignetting curve of the optical lens in Embodiment 4 of the present application.

[0044] Figure 21 Structure diagram of the optical lens in Embodiment 5 of the present application.

[0045] Figure 22 Astigmatism curve of the optical lens in Embodiment 5 of the present application.

[0046] Figure 23 F~Tan(Theta) distortion curve of the optical lens in Embodiment 5 of the present application.

[0047] Figure 24 Axial aberration curve of the optical lens in Embodiment 5 of the present application.

[0048] Figure 25 Vignetting curve of the optical lens in Embodiment 5 of the present application.

[0049] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0050] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be understood that the detailed description is merely descriptive of embodiments of the present application and is not intended to limit the scope of the present application in any way. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0051] It should be noted that the terms first, second, third, etc. are used herein only to distinguish one feature from another, and do not denote any limitation on the features. Thus, a first lens discussed below could also be termed a second lens or a third lens without departing from the teachings of the present application.

[0052] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical or aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0053] Herein, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0054] It should also be understood that the words "comprise", "comprising", "include", "including", and / or "contain", when used in this specification, specify the presence of stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or groups thereof. Furthermore, when describing the embodiments of the present application, the use of "may" means that one or more embodiments of the present application. Also, the word "exemplary" is used herein to mean "an example or illustration." At the very least, therefore, this word is not to be interpreted as a quality or performance indicator.

[0055] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0056] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0057] The optical lens provided by the embodiment of the present application comprises seven lenses, and sequentially comprises, along the optical axis from the object side to the imaging surface, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens.

[0058] In some embodiments, the first lens can have positive refractive power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have negative refractive power, the object side surface of which is convex, and the image side surface of which is concave. The third lens can have negative refractive power, the object side surface of which can be concave or convex, and the image side surface of which can be concave or convex. The fourth lens can have negative refractive power, the object side surface of which is convex at the near optical axis, and the image side surface of which is concave at the near optical axis. The fifth lens can have positive refractive power, the object side surface of which is convex at the near optical axis, and the image side surface of which is convex. The sixth lens can have positive refractive power, the object side surface of which can be concave or convex, and the image side surface of which can be concave or convex. The seventh lens can have negative refractive power, the object side surface of which is concave, and the image side surface of which is concave at the near optical axis.

[0059] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the object side and the first lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging.

[0060] In some embodiments, the optical lens can further comprise a filter, which is arranged between the seventh lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0061] In some embodiments, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.3. When the above condition is satisfied, by reasonably setting the ratio of the total optical length (i.e. the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical lens) of the optical lens to the effective focal length, the length of the optical lens can be effectively limited, the miniaturization and lightweight design of the optical lens can be realized, and the long-focus optical lens is also conducive to better realizing the small depth of field of portrait shooting, blurring the background of the person, and highlighting the main body of the person.

[0062] In some embodiments, the effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 4.1 mm < f / Fno < 4.6 mm. When the above condition is satisfied, the optical lens has a large aperture, so that the optical lens can realize high-definition imaging even in a relatively dark environment, the noise caused by too weak light can be reduced, and the imaging quality can be improved.

[0063] In some embodiments, the Abbe number Vd1 of the first lens satisfies: Vd1>80; and the Abbe number Vd1 of the first lens and the Abbe number Vd3 of the third lens satisfy: 23<Vd1-Vd3<59. When the above two conditions are satisfied, the first lens and the third lens can have a reasonable refractive index, so that the material of the first lens and the material of the third lens are matched, and thus the optical lens has better chromatic aberration correction capability, improves the resolution of the optical lens, and improves the imaging quality of the optical lens; and further, Vd1>80 ensures that the first lens has low dispersion, effectively reduces the chromatic aberration of the optical system, and is beneficial to improving the imaging quality.

[0064] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens, and the central thickness CT1 of the first lens, the central thickness CT2 of the second lens, and the central thickness CT3 of the third lens satisfy: 3.2<f123 / (CT1+CT2+CT3)<3.7. When the above condition is satisfied, the combined focal length of the first lens, the second lens and the third lens can be controlled to reduce the optical aberration of the optical lens, and the central thickness of the first lens, the second lens and the third lens on the optical axis can be controlled to improve the processability of the first lens, the second lens and the third lens.

[0065] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens, and the effective focal length f of the optical lens satisfy: 1.2<f1234 / f<1.8. When the above condition is satisfied, the ratio of the combined focal length of the first lens, the second lens, the third lens and the fourth lens to the effective focal length of the optical lens can be controlled to be within a reasonable range, so that the spherical aberration of the first four lenses of the optical lens is constrained within a reasonable range, and the imaging quality of the system is improved; and the air gap between each adjacent lens can be effectively reduced, which is beneficial to reducing the total optical length of the optical lens.

[0066] In some embodiments, the total optical length TTL of the optical lens and the real image height ih corresponding to the maximum half field angle of the optical lens satisfy: 1.5<TTL / ih<1.8. When the above condition is satisfied, the optical lens has a small length on the basis of a large image height, which meets the miniaturization design requirement; and by controlling the ratio of the total optical length of the optical lens to the real half image height, the overall image height and length of the optical lens can be reasonably adjusted, and the assembly feasibility of the optical lens is improved.

[0067] In some embodiments, the sum of the central thicknesses of the first lens to the seventh lens along the optical axis ∑CT and the distance TD of the object side surface of the first lens to the image side surface of the seventh lens on the optical axis satisfy: 0.6 < ∑CT / TD < 0.8. When the above condition is satisfied, the length of the optical lens as a whole can be controlled by controlling the sum of the central thicknesses of the first lens to the seventh lens on the optical axis, the distance of the object side surface of the first lens to the image side surface of the seventh lens on the optical axis, and the spacing of the lenses can be reasonably arranged to improve the assembly feasibility of the optical lens as a whole.

[0068] In some embodiments, the central thickness CT4 of the fourth lens, the central thickness CT5 of the fifth lens, and the spacing CT56 of the fifth lens and the sixth lens on the optical axis satisfy: 15 < (CT4 + CT5) / CT56 < 27. When the above condition is satisfied, by reasonably controlling the ratio of the central thickness of the fourth lens, the central thickness of the fifth lens, and the spacing of the fifth lens and the sixth lens on the optical axis, the distortion of the optical lens can be reasonably controlled, the optical lens has good distortion performance, ensures the high image quality characteristics of the optical lens, and ensures the imaging quality of the optical lens.

[0069] In some embodiments, the effective focal length f of the optical lens, the central thickness CT6 of the sixth lens, the spacing CT67 of the sixth lens and the seventh lens on the optical axis, and the central thickness CT7 of the seventh lens satisfy: 3.2 < f / (CT6 + CT67 + CT7) < 4.2. When the above condition is satisfied, the contribution of the third-order distortion of the sixth lens and the seventh lens can be reasonably constrained, so that the image quality of the edge field is in a reasonable range.

[0070] In some embodiments, the image side end half-field diameter CSD72 of the seventh lens and the image side end half-field diameter sagittal height SAGX72 of the seventh lens satisfy: 4.5 < |CSD72 / SAGX72| < 12. When the above condition is satisfied, by reasonably limiting the image side end half-field diameter of the seventh lens and the image side end half-field diameter sagittal height of the seventh lens, the face type of the image side surface of the seventh lens can be avoided. Overbending, which improves the imaging quality of the optical lens, is also beneficial to reducing the processing difficulty of the seventh lens.

[0071] In some embodiments, the combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the combined focal length f123 of the first lens, the second lens and the third lens satisfy: 0.95 < f1234 / f123 < 1.3. When the above condition is satisfied, by limiting f1234 / f123 within a reasonable range, the optical lens can have sufficient light converging capability at the object side, thereby shortening the total length of the optical lens and achieving the ultra-thin requirement of the optical lens; meanwhile, the combined focal length of the first lens, the second lens, the third lens and the fourth lens is controlled, so that the aberrations generated by the first four lenses and the aberrations generated by the last three lenses are balanced with each other, which is beneficial to obtain better imaging quality and achieve high resolution of the optical lens.

[0072] In some embodiments, the combined focal length f123 of the first lens, the second lens and the third lens and the combined focal length f4567 of the fourth lens, the fifth lens, the sixth lens and the seventh lens satisfy: -0.1 < f123 / f4567 < -0.01. When the above condition is satisfied, the aberration of the optical lens as a whole can be balanced to improve the imaging quality of the optical lens, the light path can be reasonably controlled to avoid the light path being too steep to cause the lens sensitivity of the optical lens to be too high, and the optical lens can be miniaturized.

[0073] In some embodiments, the radius of curvature R7 of the object side of the fourth lens and the radius of curvature R8 of the image side of the fourth lens satisfy: 0.01 < (R7-R8) / (R7+R8) < 0.3. When the above condition is satisfied, the radius of curvature of the object side and the image side of the fourth lens can be controlled to make the fourth lens have good processability.

[0074] In some embodiments, the radius of curvature R10 of the image side of the fifth lens and the distance CT56 of the fifth lens and the sixth lens on the optical axis satisfy: -95 < R10 / CT56 < -40. When the above condition is satisfied, the interval of the fifth lens and the sixth lens on the optical axis and the radius of curvature of the image side of the fifth lens can be controlled to make the fifth lens have good processability, and the assembly stability of the fifth lens and the sixth lens can also be improved.

[0075] In some embodiments, the sagittal height SAG51 of the fifth lens at the object side and the central thickness CT5 of the fifth lens satisfy: -0.3 < |SAGX51 / CT5| < -0.1. When the above condition is satisfied, the relationship between the sagittal height of the fifth lens at the object side and the central thickness of the fifth lens on the optical axis can be controlled to reduce the sensitivity of the production and manufacturing of the fifth lens, which is beneficial to the processing and forming of the fifth lens, thereby improving the production efficiency.

[0076] In some embodiments, the optical total length TTL of the optical lens, the real image height ih corresponding to the maximum half field angle of the optical lens and the effective focal length f of the optical lens satisfy: 6.5mm < TTL x (ih / f) < 7.5mm. When the above condition is satisfied, by controlling the optical power of the optical lens and ensuring that the optical lens has a large image height, the astigmatism and distortion can be effectively reduced, and the imaging quality of the optical lens is greatly improved. Further, by reasonably controlling the optical total length of the optical lens, the real half image height of the optical lens and the effective focal length of the optical lens, the optical lens is ensured to have the characteristics of large image surface and ultra-thin, and the optical lens can realize high-pixel imaging.

[0077] In some embodiments, the interval CT23 of the second lens and the third lens on the optical axis, the interval CT45 of the fourth lens and the fifth lens on the optical axis and the interval CT34 of the third lens and the fourth lens on the optical axis satisfy: 1 < (CT23 + CT45) / CT34 < 10. When the above condition is satisfied, the intervals of the second lens, the third lens, the fourth lens and the fifth lens in the direction of the optical axis are reasonably controlled, which facilitates the reasonable control of the intervals of the four lenses, effectively ensures the feasibility of the structure of the optical lens, and facilitates the assembly of the optical lens.

[0078] In some embodiments, the object side surface radius of curvature R1 of the first lens, the image side surface radius of curvature R2 of the first lens and the central thickness CT1 of the first lens satisfy: 4 < |R1-R2| / CT1 < 20. When the above condition is satisfied, the first lens of the optical lens has a reasonable shape, which reasonably bears the optical power of the optical lens and balances the aberration generated by the rear lens.

[0079] In some embodiments, the optical lens satisfies the condition: 7.5mm < f < 8.3mm, 9mm < TTL < 10mm, Fno < 2, 5.5mm < ih < 6mm, 65° < FOV < 75°, wherein f represents the effective focal length of the optical lens, TTL represents the optical total length of the optical lens, Fno represents the aperture value of the optical lens, ih represents the real image height corresponding to the maximum half field angle of the optical lens, and FOV represents the maximum field angle of the optical lens. When the above conditions are satisfied, the optical lens provided in the embodiments of the present application at least has the following characteristics: a small optical total length; a large imaging surface, which can match a large-size chip to realize high-definition imaging; a large aperture value, which enables the lens to realize high-definition imaging in a dark environment; long focal length, small field angle and short depth of field, which can better blur the background and highlight the main body when shooting distant scenes or people.

[0080] In some embodiments, the seven lenses in the optical lens can all adopt plastic lenses or adopt a glass-plastic hybrid material collocation structure. Preferably, the optical lens of the present application adopts a seven-lens glass-plastic hybrid collocation structure, which can make the optical lens better match large target chips to achieve high-definition imaging, and also achieve a reasonable balance of miniaturization, large image surface and large field of view. Specifically, the first lens can adopt a glass lens, and the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can all be plastic lenses. The first lens adopts a glass material, which can improve the thermal stability of the optical lens, reduce aberration and distortion, and make the optical lens image clearer and sharper.

[0081] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens of the optical lens provided by the present application can adopt an aspherical lens.

[0082] In various embodiments of the present application, when the lens adopts an aspherical lens, the shape of each aspherical surface of the optical lens satisfies the following equation:

[0083] ;

[0084] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, F, G and H are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteenth-order and sixteenth-order surface coefficients, respectively.

[0085] The present application will be further described in the following embodiments. In various embodiments, the thickness, curvature radius and material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only preferred embodiments of the present application, but the embodiments of the present application are not limited to the following embodiments only, and any changes, substitutions, combinations or simplifications made without departing from the innovative points of the present application should be regarded as equivalent replacement methods, and all are included in the protection scope of the present application.

[0086] Embodiment 1

[0087] Please refer to Figure 1Fig. 1 shows a structural schematic diagram of an optical lens 100 provided in Embodiment 1 of the present application, which comprises, along an optical axis from an object side to an imaging surface S17, a stop ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter G1.

[0088] The first lens L1 has positive focal power, the object side S1 is a convex surface, and the image side S2 is a concave surface.

[0089] The second lens L2 has negative focal power, the object side S3 is a convex surface, and the image side S4 is a concave surface.

[0090] The third lens L3 has negative focal power, the object side S5 is a convex surface at a near optical axis, and the image side S6 is a concave surface at a near optical axis.

[0091] The fourth lens L4 has negative focal power, the object side S7 is a convex surface at a near optical axis, and the image side S8 is a concave surface at a near optical axis.

[0092] The fifth lens L5 has positive focal power, the object side S9 is a convex surface at a near optical axis, and the image side S10 is a convex surface.

[0093] The sixth lens L6 has positive focal power, the object side S11 is a concave surface, and the image side S12 is a convex surface.

[0094] The seventh lens L7 has negative focal power, the object side S13 is a concave surface, and the image side S14 is a concave surface at a near optical axis.

[0095] The object side S15 and the image side S16 of the filter G1 are both flat surfaces.

[0096] The imaging surface S17 is a flat surface.

[0097] The first lens L1 is a glass aspheric lens; the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspheric lenses.

[0098] The related parameters of the lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-1.

[0099] Table 1-1

[0100]

[0101] The surface type parameters of the aspheric lenses in the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0102] Table 1-2

[0103]

[0104] In this embodiment, the astigmatism curve, the F-Tan (Theta) distortion curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 100 are shown as follows: Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 shown.

[0105] Figure 2 The astigmatism curve of the optical lens 100 in this embodiment is shown, which shows the astigmatism of light in the meridional image plane and the sagittal image plane. The horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1mm, indicating that the optical lens 100 can effectively correct astigmatism.

[0106] Figure 3 The following figure shows the F-Tan (Theta) distortion curve of the optical lens 100 in this embodiment, which represents the distortion at different field angles on the imaging plane. The horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field angle (unit: °). As can be seen from the figure, the distortion value is controlled within ±1%, indicating that the optical lens 100 is able to correct distortion well.

[0107] Figure 4 The following is a graph showing the axial aberration of the optical lens 100 in this embodiment, which represents the aberration of each wavelength on the optical axis at the imaging plane. The horizontal axis represents the axial aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the graph, the offset of the axial aberration is controlled within ±0.03mm, indicating that the optical lens 100 is able to effectively correct the axial aberration.

[0108] Figure 5 A graph showing the vertical chromatic aberration of the optical lens 100 in this embodiment shows the chromatic aberration of each wavelength relative to the central wavelength (0.555 μm) at different image heights on the imaging plane. The horizontal axis represents the vertical chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the graph, the vertical chromatic aberration for the longest and shortest wavelengths is controlled within ±1 μm, indicating that the optical lens 100 is capable of effectively correcting chromatic aberration.

[0109] Example 2

[0110] See also Figure 6 , shown is a schematic structural diagram of the optical lens 200 provided in Example 2 of the present invention. Compared with Example 1, the main differences between this embodiment and Example 1 are: the object-side surface S5 of the third lens L3 is a concave surface; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0111] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0112] Table 2-1

[0113]

[0114] The surface type parameters of the aspherical lens of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0115] Table 2-2

[0116]

[0117] In this embodiment, the astigmatism curve, the F~Tan(Theta) distortion curve, the axial aberration curve and the transverse aberration curve of the optical lens 200 are shown in Figure 7 , Figure 8 , Figure 9 , Figure 10 respectively.

[0118] As can be seen from Figure 7 , the astigmatism of the meridional image surface and the sagittal image surface is controlled within ±0.1mm, which shows that the optical lens 200 can correct the astigmatism well.

[0119] As can be seen from Figure 8 , the distortion value is controlled within ±1%, which shows that the optical lens 200 can correct the distortion well.

[0120] As can be seen from Figure 9 , the offset of the axial aberration is controlled within ±0.03mm, which shows that the optical lens 200 can correct the axial aberration well.

[0121] As can be seen from Figure 10 , the transverse aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, which shows that the optical lens 200 can correct the chromatic aberration well.

[0122] Embodiment 3

[0123] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that: the object side S5 of the third lens L3 is a concave surface; the image side S6 of the third lens L3 is a convex surface; the object side S11 of the sixth lens L6 is a convex surface near the optical axis; the image side S12 of the sixth lens L6 is a concave surface near the optical axis; the optical parameters such as the curvature radius and the lens thickness of each lens surface are different.

[0124] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0125] Table 3-1

[0126]

[0127] The surface profile parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0128] Table 3-2

[0129]

[0130] In this embodiment, the astigmatism curve, the F~Tan(Theta) distortion curve, the axial aberration curve, and the transverse chromatic aberration curve of the optical lens 300 are shown in Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 respectively.

[0131] As can be seen from Figure 12 , the astigmatism of the meridional image surface and the sagittal image surface is controlled within ±0.1 mm, which indicates that the optical lens 300 can better correct the astigmatism.

[0132] As can be seen from Figure 13 , the distortion value is controlled within ±1%, which indicates that the optical lens 300 can better correct the distortion.

[0133] As can be seen from Figure 14 , the offset of the axial aberration is controlled within ±0.02 mm, which indicates that the optical lens 300 can better correct the axial aberration.

[0134] As can be seen from Figure 15 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, which indicates that the optical lens 300 can better correct the chromatic aberration.

[0135] Embodiment 4

[0136] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0137] The related parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0138] Table 4-1

[0139]

[0140] The surface profile parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0141] Table 4-2

[0142]

[0143] In this embodiment, the astigmatism curve, the F-Tan (Theta) distortion curve, the axial aberration curve, and the vertical chromatic aberration curve of the optical lens 400 are shown as follows: Figure 17 、 Figure 18 、 Figure 19 、 Figure 20 shown.

[0144] from Figure 17 It can be seen from the figure that the astigmatism of the meridional image plane and the sagittal image plane is controlled within ±0.1 mm, indicating that the optical lens 400 can correct the astigmatism well.

[0145] from Figure 18 It can be seen that the distortion value is controlled within ±1%, indicating that the optical lens 400 can correct the distortion well.

[0146] from Figure 19 It can be seen that the offset of the axial aberration is controlled within ±0.02 mm, indicating that the optical lens 400 can correct the axial aberration well.

[0147] from Figure 20 It can be seen from the figure that the vertical axis chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0148] Example 5

[0149] See also Figure 21 , shown is a schematic structural diagram of an optical lens 500 provided in Example 5 of the present invention. Compared with Example 1, this embodiment has the following main differences: the object-side surface S5 of the third lens L3 is concave; the object-side surface S11 of the sixth lens L6 is convex at the near optical axis; the image-side surface S12 of the sixth lens L6 is concave at the near optical axis; and the optical parameters such as the curvature radius of each lens surface and the lens thickness are different.

[0150] The relevant parameters of each lens in the optical lens 500 in Example 5 are shown in Table 5-1.

[0151] Table 5-1

[0152]

[0153] The surface parameters of the aspheric lens of the optical lens 500 in Example 5 are shown in Table 5-2.

[0154] Table 5-2

[0155]

[0156] In the embodiment, the astigmatism curve, the F~Tan(Theta) distortion curve, the axial aberration curve and the lateral chromatic aberration curve of the optical lens 500 are shown in FIGS. 8A, 8B, 8C and 8D respectively. Figure 22 、 Figure 23 、 Figure 24 、 Figure 25

[0157] It can be seen from FIGS. 8A, 8B, 8C and 8D that the astigmatism of the sagittal image surface and the tangential image surface is controlled within ±0.1 mm, which indicates that the optical lens 500 can correct the astigmatism well. Figure 22

[0158] It can be seen from FIGS. 8A, 8B, 8C and 8D that the distortion value is controlled within ±1%, which indicates that the optical lens 500 can correct the distortion well. Figure 23

[0159] It can be seen from FIGS. 8A, 8B, 8C and 8D that the offset of the axial aberration is controlled within ±0.02 mm, which indicates that the optical lens 500 can correct the axial aberration well. Figure 24

[0160] It can be seen from FIGS. 8A, 8B, 8C and 8D that the lateral chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1 μm, which indicates that the optical lens 500 can correct the chromatic aberration well. Figure 25

[0161] Referring to Table 6, the optical characteristics corresponding to the above embodiments are shown, including the effective focal length f, the total track length TTL, the aperture value Fno, the real image height ih corresponding to the maximum half field angle, the chief ray angle CRA at the maximum image height, the maximum field angle FOV of the optical lens, and the numerical value corresponding to each conditional expression in the embodiments.

[0162] Table 6

[0163]

[0164] In summary of the above embodiments, the optical lens provided by the present application has the following beneficial effects by adopting seven pieces of glass-plastic hybrid structure, through specific surface shape setting and reasonable power distribution:

[0165] 1. Having a long focal length (7.5 mm < f < 8.3 mm), which is beneficial to better realize the portrait shooting effect of small depth of field, blur the background and highlight the subject;

[0166] 2. Having a large aperture (Fno < 2), which is beneficial to improve the light amount of the lens and enable the lens to realize high-definition imaging in a dim environment;

[0167] ​​​​​3. With large image surface, can match larger size chip, can high pixel imaging; total length is short (TTL<10mm), is beneficial to realize miniaturization, can directly vertical imaging, need not help three prism deflection light imaging;

[0168] 4. Adopt glass-plastic hybrid structure (1MG6P), so that the optical lens has good thermal stability; at the same time, the Abbe number Vd1 of the first lens is greater than 80, low dispersion, effectively reduces the chromatic aberration of the optical system, is beneficial to improve the imaging quality;

[0169] 5. Can reasonably correct the overall aberration of the optical lens, has small distortion (within ±1%), can provide more accurate and clear imaging effect.

[0170] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0171] The above-described embodiments only express several implementation manners of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be noted that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising seven lenses, characterized in that: It sequentially includes, from the object side to the imaging surface along the optical axis: A first lens with positive optical power, whose object side is convex and whose image side is concave; A second lens with negative optical power, whose object side is convex and whose image side is concave; A third lens with negative optical power; A fourth lens with negative optical power, whose object side is convex near the optical axis and whose image side is concave near the optical axis; A fifth lens with positive optical power, whose object side is convex near the optical axis and whose image side is convex; A sixth lens with positive optical power; A seventh lens with negative optical power, whose object side is concave and whose image side is concave near the optical axis; Wherein, the total optical length TTL of the optical lens and the effective focal length f of the optical lens satisfy: 1.1 < TTL / f < 1.3; The total optical length TTL of the optical lens and the true image height ih corresponding to the maximum half field angle of the optical lens satisfy: 1.5 < TTL / ih < 1.8; 7.5mm < f < 8.3mm, 5.5mm < ih < 6mm, 65° < FOV < 75°, f represents the effective focal length of the optical lens, ih represents the true image height corresponding to the maximum half field angle of the optical lens, and FOV represents the maximum field angle of the optical lens.

2. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the aperture value Fno of the optical lens satisfy: 4.1mm < f / Fno < 4.6mm.

3. The optical lens according to claim 1, wherein: The Abbe number Vd1 of the first lens satisfies: Vd1 > 80; the Abbe number Vd1 of the first lens and the Abbe number Vd3 of the third lens satisfy: 23 < Vd1 - Vd3 < 59.

4. The optical lens according to claim 1, wherein: The combined focal length f123 of the first lens, the second lens and the third lens and the center thickness CT1 of the first lens, the center thickness CT2 of the second lens, the center thickness CT3 of the third lens satisfy: 3.2 < f123 / (CT1 + CT2 + CT3) < 3.

7.

5. The optical lens according to claim 1, wherein: The combined focal length f1234 of the first lens, the second lens, the third lens and the fourth lens and the effective focal length f of the optical lens satisfy: 1.2 < f1234 / f < 1.

8.

6. The optical lens according to claim 1, wherein: The sum ∑CT of the center thicknesses of the first lens to the seventh lens along the optical axis and the distance TD on the optical axis from the object side of the first lens to the image side of the seventh lens satisfy: 0.6 < ∑CT / TD < 0.

8.

7. The optical lens according to claim 1, wherein: The center thickness CT4 of the fourth lens, the center thickness CT5 of the fifth lens and the distance CT56 on the optical axis between the fifth lens and the sixth lens satisfy: 15 < (CT4 + CT5) / CT56 < 27.

8. The optical lens according to claim 1, wherein: The effective focal length f of the optical lens and the center thickness CT6 of the sixth lens, the distance CT67 on the optical axis between the sixth lens and the seventh lens, the center thickness CT7 of the seventh lens satisfy: 3.2 < f / (CT6 + CT67 + CT7) < 4.

2.

9. The optical lens according to claim 1, wherein: The semi-aperture CSD72 of the image-side clear light end of the seventh lens and the sag height SAGX72 of the semi-aperture of the image-side clear light end of the seventh lens satisfy the following: 4.5<|CSD72 / SAGX72|<12.

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