Optical lens

Abstract

The application provides an optical lens, which has five pieces of lenses with optical power, and sequentially comprises, along an optical axis from an object side to an imaging surface: a first lens with negative optical power, whose object side surface is a convex surface and whose image side surface is a concave surface; a second lens with negative optical power, whose object side surface is a concave surface near the optical axis and whose image side surface is a concave surface; a third lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a convex surface; a fourth lens with optical power, whose object side surface is a convex surface; and a fifth lens with positive optical power, whose object side surface is a convex surface and whose image side surface is a concave surface near the optical axis; wherein a real image height IH corresponding to a maximum field angle of the optical lens and an effective focal length f of the optical lens satisfy: 3<IH / f<3.2. The optical lens provided by the application has one or more advantages of miniaturization, super wide angle, small CRA, large image surface, large aperture, high imaging quality and the like through specific surface shape matching and reasonable optical power distribution.

Description

Technical Field

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

[0002] In recent years, with the rapid development of intelligent technology, intelligent lawn mowers are gradually replacing traditional lawn mowers. Intelligent lawn mowers can perceive the surrounding environment through a sensor system, plan a mowing path through a navigation system, and then perform mowing operations using a mowing system. However, the radar infrared detection lenses of currently commercially available lawn mowers either have too small an aperture, resulting in dark recorded images, or too small a field of view, which cannot comprehensively detect changes in the surrounding environment. Summary of the Invention

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

[0004] The technical solution adopted by the present invention is as follows: An optical lens has five lenses with optical power, which sequentially include from the object side to the imaging surface along the optical axis: a first lens with negative optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface; a second lens with negative optical power, wherein the object side surface thereof is a concave surface at the paraxial position, and the image side surface thereof is a concave surface; a third lens with positive optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface; a fourth lens with optical power, wherein the object side surface thereof is a convex surface; a fifth lens with positive optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface at the paraxial position; wherein the real image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 3<IH / f<3.2; the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: -2.9<f12 / f<-2.4.

[0005] Further preferably, the combined focal length f345 of the third lens, the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 0.9<f345 / f<0.95.

[0006] Further preferably, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 20mm<TTL / Fno<22mm.

[0007] Further preferably, the maximum field of view FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 72° / mm<FOV / EPD<77° / mm.

[0008] Further preferably, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.3<f1 / f<-2.8; the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens and the focal length f1 of the first lens satisfy: -0.5<f1 / (R1+R2)<-0.4.

[0009] Further preferably, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -4.9<f2 / f<-3.2; the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy: -5.9<R3 / f<-2.4.

[0010] Further preferably, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.4<f3 / f<3.3; the radius of curvature R6 of the image-side surface of the third lens and the effective focal length f of the optical lens satisfy: -3.3<R6 / f<-2.6.

[0011] Further preferably, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.5<f5 / f<8.2; the radius of curvature R9 of the object-side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3<R9 / f<2.6.

[0012] Further preferably, the sag height SAG11 of the clear aperture half-diameter on the object-side surface of the first lens and the center thickness CT1 of the first lens satisfy: 1.5<SAG11 / CT1<2.4.

[0013] Further preferably, the clear aperture half-diameter CSD11 on the object-side surface of the first lens and the clear aperture half-diameter CSD51 on the object-side surface of the fifth lens satisfy: 1.4<CSD11 / CSD51<1.7.

[0014] The optical lens provided by the present invention adopts five lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, enhance the imaging performance of the optical lens, and endow the lens with one or more advantages such as ultra-wide angle, large aperture, miniaturization, small CRA, large image plane, and high imaging quality. Brief Description of the Drawings

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following accompanying drawings, in which: Figure 1 is a schematic structural diagram of the optical lens in Embodiment 1 of the present invention.

[0016] Figure 2 This is a field curvature curve diagram of the optical lens in Embodiment 1 of the present invention.

[0017] Figure 3 This is an F-Theta distortion curve of the optical lens in Embodiment 1 of the present invention.

[0018] Figure 4 This is an axial aberration curve of the optical lens in Embodiment 1 of the present invention.

[0019] Figure 5 This is a chromatic aberration curve of the optical lens in Embodiment 1 of the present invention.

[0020] Figure 6 This is a schematic diagram of the optical lens structure in Embodiment 2 of the present invention.

[0021] Figure 7 This is a field curvature curve diagram of the optical lens in Embodiment 2 of the present invention.

[0022] Figure 8 This is the F-Theta distortion curve of the optical lens in Embodiment 2 of the present invention.

[0023] Figure 9 This is an axial aberration curve of the optical lens in Embodiment 2 of the present invention.

[0024] Figure 10 This is a chromatic aberration curve of the optical lens in Embodiment 2 of the present invention.

[0025] Figure 11 This is a schematic diagram of the optical lens in Embodiment 3 of the present invention.

[0026] Figure 12 This is a field curvature curve diagram of the optical lens in Embodiment 3 of the present invention.

[0027] Figure 13 This is the F-Theta distortion curve of the optical lens in Embodiment 3 of the present invention.

[0028] Figure 14 This is an axial aberration curve of the optical lens in Embodiment 3 of the present invention.

[0029] Figure 15 This is a chromatic aberration curve of the optical lens in Embodiment 3 of the present invention.

[0030] Figure 16 This is a schematic diagram of the optical lens structure in Embodiment 4 of the present invention.

[0031] Figure 17 This is a field curvature curve diagram of the optical lens in Embodiment 4 of the present invention.

[0032] Figure 18This is the F-Theta distortion curve of the optical lens in Embodiment 4 of the present invention.

[0033] Figure 19 This is an axial aberration curve of the optical lens in Embodiment 4 of the present invention.

[0034] Figure 20 This is a chromatic aberration curve of the optical lens in Embodiment 4 of the present invention.

[0035] The following detailed description, in conjunction with the accompanying drawings, will further illustrate the present invention. Detailed Implementation

[0036] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] It should be noted that in this specification, the terms "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of the invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0038] In the accompanying drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are illustrated by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustrative purposes only and are not strictly to scale.

[0039] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the location of the concaveness is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0040] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not exclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0041] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0042] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0043] The optical lens provided in this embodiment of the invention has five lenses with optical power, which are arranged sequentially from the object side to the imaging plane along the optical axis as a first lens, a second lens, a third lens, a fourth lens, and a fifth lens.

[0044] In some embodiments, the first lens may have negative optical power, with a convex object-side surface and a concave image-side surface. The second lens may have negative optical power, with a concave object-side surface near the optical axis and a concave image-side surface. The third lens may have positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens may have either positive or negative optical power, with a convex object-side surface and either a concave or convex image-side surface. The fifth lens may have positive optical power, with a convex object-side surface and a concave image-side surface near the optical axis.

[0045] In some embodiments, the optical lens may also include an aperture stop, which may be located between the second lens and the third lens or the third lens and the fourth lens. It is understood that the aperture stop is used to limit the amount of light entering the lens to change the brightness of the image. When the aperture stop is located between the second lens and the third lens or the third lens and the fourth lens, it facilitates the correction of aperture aberrations.

[0046] In some embodiments, the optical lens may further include a filter, which may be disposed between the fifth lens and the imaging surface. The filter is used to filter out interfering light and prevent interfering light from reaching the imaging surface of the optical lens and affecting normal imaging.

[0047] In some embodiments, the real image height IH corresponding to the maximum field of view angle of the optical lens and the effective focal length f of the optical lens satisfy: 3<IH / f<3.2. Meeting the above conditional expression, the ratio of the effective focal length to the image height of the optical lens is controlled. Shortening the effective focal length can expand the field of view angle, enable the optical lens to capture a wider object-side space, increase the width of the light beam entering the optical lens, improve the brightness of the optical lens at the image plane and avoid vignetting; at the same time, the optical lens is provided with a large image plane characteristic, which matches a large image plane chip to improve the resolution and ensure the imaging quality of the optical lens.

[0048] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: -2.9<f12 / f<-2.4. Meeting the above conditional expression, the front lens group composed of the first lens and the second lens is designed to have negative optical power, so that the optical lens can receive light with a large field of view angle, and is beneficial for the large-angle light beam to pass through the diaphragm, so as to meet the ultra-wide-angle requirement of the optical lens, and also help to improve the brightness of the marginal field of view on the imaging plane, thereby improving the imaging definition at the marginal field of view.

[0049] In some embodiments, the combined focal length f345 of the third lens, the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 0.9<f345 / f<0.95. Meeting the above conditional expression, the rear lens group formed by the combination of the third lens to the fifth lens has positive optical power, which is beneficial for correcting chromatic aberration and field curvature of the optical lens, reducing the light deflection angle, lowering the sensitivity, reducing the lens molding difficulty, and can realize the balance of the overall spherical aberration, so as to obtain good imaging quality of the axial field of view.

[0050] In some embodiments, the total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 20mm<TTL / Fno<22mm. Meeting the above conditional expression, by controlling the relationship between the total length of the optical lens and the aperture value, it is ensured that the optical lens can meet the design requirements of large aperture and miniaturization, so that the optical lens can obtain sufficient light throughput even in a dim environment, and meet the needs of high-quality and high-definition shooting.

[0051] In some embodiments, the maximum field of view angle FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 72° / mm<FOV / EPD<77° / mm. Meeting the above conditional expression, the optical lens is provided with a large field of view angle range and a large entrance pupil diameter, and can also present the large aperture effect and a long depth of field range of the optical lens, that is, the optical lens can realize large-angle clear imaging, and still have clear recognition ability for near objects, with high imaging quality.

[0052] In some embodiments, the focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.3<f1 / f<-2.8. Satisfying the above conditional expression enables the first lens to have negative refractive power, which can diverge the light rays passing through it, expand the field of view of the optical lens, and simplify the balance between overall aberration correction and imaging quality of the optical lens.

[0053] In some embodiments, the radius of curvature R1 of the object-side surface of the first lens, the radius of curvature R2 of the image-side surface of the first lens, and the focal length f1 of the first lens satisfy: -0.5<f1 / (R1+R2)<-0.4. Satisfying the above conditional expression can constrain the surface profiles of the object-side surface and the image-side surface of the first lens, which is beneficial to reduce the bending degree of light rays at the image-side surface of the first lens, reduce the astigmatism of the optical lens, so as to balance the astigmatism problem caused by the large field of view of the optical lens, prevent the astigmatism from being too large while the optical lens has a large field of view, and further ensure that the optical lens has excellent imaging quality.

[0054] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -4.9<f2 / f<-3.2. Satisfying the above conditional expression and setting the second lens to have negative refractive power can further control the incident angle of light rays, expand the field of view range of the optical lens, and simultaneously increase the back focal length of the optical lens to avoid interference between the lens and the photosensitive chip, and is also beneficial to aberration correction, which can further improve the imaging quality of the optical lens.

[0055] In some embodiments, the radius of curvature R3 of the object-side surface of the second lens and the effective focal length f of the optical lens satisfy: -5.9<R3 / f<-2.4. Satisfying the above conditional expression can smoothly receive the light rays exiting from the first lens, reduce sensitivity and light energy loss, and is beneficial to achieving high resolution.

[0056] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.4<f3 / f<3.3. Satisfying the above conditional expression enables the third lens to have the effect of converging light rays, and in combination with the negative refractive power of the first lens and the second lens, can further converge the light rays passing through the second lens, reduce the height of peripheral light rays, which is beneficial to reducing the aperture of the rear-end lens, and at the same time beneficial to balancing aberrations and improving resolution.

[0057] In some embodiments, the radius of curvature R6 of the image-side surface of the third lens and the effective focal length f of the optical lens satisfy: -3.3<R6 / f<-2.6. Satisfying the above conditional expression and designing the image-side surface of the third lens as a convex surface can reasonably limit the width of the light beam exiting from the third lens, while reducing the sensitivity of the optical lens and improving assembly stability.

[0058] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.5<f5 / f<8.2. Satisfying the above conditional expression defines that the fifth lens has positive refractive power, which is beneficial to light convergence, so that chromatic aberration can be effectively corrected. Meanwhile, as the last lens, the fifth lens can perform final correction on the aberration caused by the eccentricity error of each lens on the object side, that is, the eccentricity sensitivity of the optical lens can be reduced, the astigmatism caused by the eccentricity of each lens on the object side can be suppressed, so as to realize the correction of the aberration of the optical lens and improve the imaging resolution.

[0059] In some embodiments, the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3<R9 / f<2.6. Satisfying the above conditional expression is beneficial to shrinking the light entering the fifth lens, and further facilitating the realization of a short back focal length.

[0060] In some embodiments, the sag height SAG11 of the clear aperture half-caliber on the object side surface of the first lens and the center thickness CT1 of the first lens satisfy: 1.5<SAG11 / CT1<2.4. Satisfying the above conditional expression, by controlling the ratio of the sag height of the object side surface of the first lens to the center thickness of the first lens on the optical axis, the surface shape of the object side surface can be made to tend to bend, and the larger sag height is beneficial for the first lens to collect light of a large field of view, realize high angular resolution at the center of the optical lens, and further improve the imaging quality of the central region.

[0061] In some embodiments, the clear aperture half-caliber CSD11 on the object side surface of the first lens and the clear aperture half-caliber CSD51 on the object side surface of the fifth lens satisfy: 1.4<CSD11 / CSD51<1.7. Satisfying the above conditional expression, by controlling the ratio of the clear aperture half-caliber at the object side end of the first lens to the clear aperture half-caliber at the object side end of the fifth lens, it is ensured that the optical lens can realize large-angle light collection, realize large field-of-view angle imaging of the optical lens, increase the imaging area of the optical lens, and improve the imaging quality.

[0062] In some embodiments, the focal length f2 of the second lens and the center thickness CT2 of the second lens satisfy: -12.1<f2 / CT2<-7.2. Satisfying the above conditional expression can reasonably configure the effective focal length and thickness of the second lens, so that the light enters the optical lens more gently, the sensitivity of the optical lens is reduced, it is beneficial to correct the aberration generated by the optical lens, and further it is beneficial to improve the imaging quality of the optical lens.

[0063] In some embodiments, the clear aperture half-caliber CSD51 on the object side surface of the fifth lens and the sag height SAG51 of the clear aperture half-caliber on the object side surface of the fifth lens satisfy: 3<CSD51 / SAG51<28. Satisfying the above conditional expression, by adjusting the surface shape of the edge region of the object side surface of the fifth lens, the ghost reflection energy can be reduced and the field curvature can be optimized, so as to improve the imaging quality of the optical lens.

[0064] In some embodiments, the edge thickness ET1 of the first lens and the center thickness CT1 of the first lens satisfy: 1.3<ET1 / CT1<2. By satisfying the above conditional expression, the ratio of the edge thickness of the first lens to the thickness of the first lens on the optical axis is reasonably controlled, so that the thickness ratio of the first lens can be properly regulated, thereby optimizing the surface profile of the first lens, facilitating the effective convergence of light rays incident at a large angle, and enabling the light rays passing through the first lens to have a small deflection angle, so as to reduce the generation of stray light and further ensure good imaging performance.

[0065] In some embodiments, the clear aperture half-diameter CSD11 of the object-side surface of the first lens and the on-axis distance CT12 between the first lens and the second lens satisfy: 2.5<CSD11 / CT12<2.9. By satisfying the above conditional expression, the clear aperture of the object-side surface of the first lens is controlled and the air gap between the first lens and the second lens is reduced, which is beneficial to reducing the total length of the optical lens, making the layout of the optical lens more compact and reducing the risk of ghost image generation; furthermore, it is also beneficial to lower the difficulty of structural layout of the optical lens and improve the assembly and molding yield of the optical lens.

[0066] In some embodiments, the optical lens satisfies the following conditional expressions: 2.6mm<f<2.8mm; 164°<FOV<168°; 2.1mm<EPD<2.3mm; 24mm<TTL<27mm; 1.2<Fno<1.25; 2.4°<CRA<4.3°; 8.4mm<IH<8.6mm. In the above conditional expressions, f denotes the effective focal length of the optical lens, TTL denotes the total optical length of the optical lens, FOV denotes the maximum field of view of the optical lens, EPD denotes the entrance pupil diameter of the optical lens, Fno denotes the f-number of the optical lens, CRA denotes the chief ray incident angle at the maximum image height of the optical lens, and IH denotes the real image height corresponding to the maximum field of view of the optical lens. By satisfying the above conditional expressions, the optical lens has at least one or more of the advantages including short focal length, ultra-large field of view, large entrance pupil diameter, short total length, large aperture, small CRA, large image plane, low distortion and low sensitivity.

[0067] In some embodiments, the material of the lenses in the optical lens provided by the present invention may be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by utilizing the low dispersion characteristic of glass itself. In the present invention, the second lens, the fourth lens and the fifth lens are made of plastic; the first lens and the third lens are made of glass.

[0068] In some embodiments, the first, second, third, fourth, and fifth lenses can be spherical or aspherical lenses. Compared to spherical structures, aspherical structures can effectively reduce aberrations in the optical system, thereby reducing the number of lenses and their size, and better achieving lens miniaturization. More specifically, the second, fourth, and fifth lenses of this invention are aspherical lenses; the first and third lenses are spherical lenses.

[0069] In various embodiments of the present invention, when an aspherical lens is used, the shapes of each aspherical surface of the optical lens satisfy the following equations: ; Where z is the distance between the surface and the vertex of the surface in the direction of the optical axis, h is the distance from the optical axis to the surface, c is the curvature of the vertex of the surface, K is the quadratic surface coefficient, and B, C, D, E, F, G, and H are the fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth order surface coefficients, respectively.

[0070] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0071] Example 1

[0072] Please see Figure 1 The diagram shows a schematic of the structure of the optical lens 100 provided in Embodiment 1 of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane, the following components in sequence: a first lens L1, a second lens L2, an aperture ST, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0073] Among them, the first lens L1 has negative optical power, its object side S1 is convex, and its image side S2 is concave. The second lens L2 has negative optical power, its object side S3 is concave near the optical axis, and its image side S4 is concave. The third lens L3 has positive optical power, its object side S5 is convex, and its image side S6 is convex. The fourth lens L4 has positive optical power, its object side S7 is convex, and its image side S8 is concave. The fifth lens L5 has positive optical power, its object side S9 is convex, and its image side S10 is concave near the optical axis. The object-side surface S11 and the image-side surface S12 of the filter G1 are both planar. The imaging plane S13 is a plane.

[0074] The first lens L1 and the third lens L3 are glass spherical lenses; the second lens L2, the fourth lens L4, and the fifth lens L5 are plastic aspherical lenses.

[0075] The relevant parameters of each lens in the optical lens 100 in Example 1 are shown in Table 1-1.

[0076] Table 1-1 The surface profile parameters of the aspherical lens of the optical lens 100 in Example 1 are shown in Table 1-2.

[0077] Table 1-2 In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 As shown.

[0078] Figure 2 The field curvature curve of Example 1 is shown, which represents the degree of curvature of light in the meridional and sagittal image planes. 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 field curvature of the meridional and sagittal image planes is controlled within -0.1 mm to 0.15 mm, indicating that the optical lens can effectively correct the field curvature.

[0079] Figure 3 The F-Theta distortion curve of Example 1 is shown, which represents the F-Theta distortion of light at different image heights on the imaging plane. The horizontal axis represents the F-Theta distortion value (unit: %), and the vertical axis represents the field of view (unit: °). As can be seen from the figure, the F-Theta distortion of the optical lens is controlled within -5% to 10%, indicating that the optical lens can effectively correct distortion.

[0080] Figure 4 The diagram shows the axial aberration curves for Example 1, representing the aberrations of each wavelength along 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. The diagram shows that the axial aberration offset is controlled within ±0.02 mm, indicating that the optical lens can effectively correct axial aberrations.

[0081] Figure 5The diagram shows the transverse chromatic aberration curves for Example 1, representing the chromatic aberration of each wavelength relative to the center wavelength (0.940 μm) at different image heights on the imaging plane. The horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the center wavelength (unit: μm), and the vertical axis represents the normalized field of view. As can be seen from the diagram, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within -2 μm to 5 μm, indicating that the optical lens can effectively correct chromatic aberration.

[0082] Example 2

[0083] Please see Figure 6 The figure shows a schematic diagram of the structure of the optical lens 200 provided in Embodiment 2 of the present invention. The main difference between this embodiment and Embodiment 1 is that the image side surface S8 of the fourth lens L4 is a convex surface; the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0084] The relevant parameters of each lens in the optical lens 200 in Example 2 are shown in Table 2-1.

[0085] Table 2-1 The surface profile parameters of the aspherical lens of the optical lens 200 in Example 2 are shown in Table 2-2.

[0086] Table 2-2 In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 200 are respectively as follows: Figure 7 , Figure 8 , Figure 9 , Figure 10 As shown.

[0087] from Figure 7 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.1mm to 0.05mm, indicating that the optical lens can effectively correct the field curvature.

[0088] from Figure 8 As can be seen, the F-Theta distortion of the optical lens is controlled within -5% to 10%, indicating that the optical lens can effectively correct distortion.

[0089] from Figure 9 As can be seen, the axial aberration offset is controlled within -0.02mm to 0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0090] from Figure 10 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the optical lens can effectively correct chromatic aberration.

[0091] Example 3

[0092] Please see Figure 11 The figure shows a schematic diagram of the structure of the optical lens 300 provided in Embodiment 3 of the present invention. The main difference between this embodiment and Embodiment 1 is that the aperture stop ST is located between the third lens L3 and the fourth lens L4; the fourth lens has negative optical power; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0093] The relevant parameters of each lens in the optical lens 300 in Example 3 are shown in Table 3-1.

[0094] Table 3-1 The surface profile parameters of the aspherical lens of the optical lens 300 in Example 3 are shown in Table 3-2.

[0095] Table 3-2 In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 300 are respectively as follows: Figure 12 , Figure 13 , Figure 14 , Figure 15 As shown.

[0096] from Figure 12 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.2mm to 0.15mm, indicating that the optical lens can effectively correct the field curvature.

[0097] from Figure 13 As can be seen, the F-Theta distortion of the optical lens is controlled within 0~10%, indicating that the optical lens can effectively correct distortion.

[0098] from Figure 14 As can be seen, the axial aberration offset is controlled within -0.04mm to 0.02mm, indicating that the optical lens can effectively correct axial aberration.

[0099] from Figure 15 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the optical lens can effectively correct chromatic aberration.

[0100] Example 4

[0101] Please see Figure 16The figure shows a schematic diagram of the structure of the optical lens 400 provided in Embodiment 4 of the present invention. The main difference between this embodiment and Embodiment 1 is that the aperture ST is located between the third lens L3 and the fourth lens L4; the image side S8 of the fourth lens L4 is a convex surface; and the optical parameters such as the radius of curvature and lens thickness of each lens surface are different.

[0102] The relevant parameters of each lens in the optical lens 400 in Example 4 are shown in Table 4-1.

[0103] Table 4-1 The surface profile parameters of the aspherical lens of the optical lens 400 in Example 4 are shown in Table 4-2.

[0104] Table 4-2 In this embodiment, the field curvature curve, F-Theta distortion curve, axial aberration curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown.

[0105] from Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within -0.15mm to 0.2mm, indicating that the optical lens can effectively correct the field curvature.

[0106] from Figure 18 As can be seen, the F-Theta distortion of the optical lens is controlled within -5% to 10%, indicating that the optical lens can effectively correct distortion.

[0107] from Figure 19 As can be seen, the axial aberration offset is controlled within ±0.04mm, indicating that the optical lens can effectively correct axial aberration.

[0108] from Figure 20 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±3μm, indicating that the optical lens can effectively correct chromatic aberration.

[0109] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, maximum field of view FOV, principal ray incident angle CRA at the maximum image height of the optical lens, and the values ​​corresponding to each conditional expression in each embodiment.

[0110] Table 5 In summary, the optical lens provided by the present invention uses five lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as ultra-wide angle, large aperture, miniaturization, small CRA, large image plane, and high imaging quality.

[0111] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0112] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. An optical lens comprising five lenses having optical power, characterized in that, Along the optical axis from the object side to the image plane, the components are arranged in sequence as follows: a first lens with negative optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface; a second lens with negative optical power, wherein the object side surface thereof is a concave surface at a position near the optical axis, and the image side surface thereof is a concave surface; a third lens with positive optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a convex surface; a fourth lens with optical power, wherein the object side surface thereof is a convex surface; a fifth lens with positive optical power, wherein the object side surface thereof is a convex surface, and the image side surface thereof is a concave surface at a position near the optical axis; wherein the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 3<IH / f<3.2; the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: -2.9<f12 / f<-2.4; the combined focal length f345 of the third lens, the fourth lens and the fifth lens and the effective focal length f of the optical lens satisfy: 0.9<f345 / f<0.

95.

2. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 20mm<TTL / Fno<22mm.

3. The optical lens according to claim 1, characterized in that, The maximum field angle FOV of the optical lens and the entrance pupil diameter EPD of the optical lens satisfy: 72° / mm<FOV / EPD<77° / mm.

4. The optical lens according to claim 1, characterized in that, The focal length f1 of the first lens and the effective focal length f of the optical lens satisfy: -3.3<f1 / f<-2.8; the curvature radius R1 of the object side surface of the first lens, the curvature radius R2 of the image side surface of the first lens and the focal length f1 of the first lens satisfy: -0.5<f1 / (R1+R2)<-0.

4.

5. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -4.9<f2 / f<-3.2; the curvature radius R3 of the object side surface of the second lens and the effective focal length f of the optical lens satisfy: -5.9<R3 / f<-2.

4.

6. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 2.4<f3 / f<3.3; the curvature radius R6 of the image side surface of the third lens and the effective focal length f of the optical lens satisfy: -3.3<R6 / f<-2.

6.

7. The optical lens according to claim 1, characterized in that, The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: 2.5<f5 / f<8.2; the curvature radius R9 of the object side surface of the fifth lens and the effective focal length f of the optical lens satisfy: 1.3<R9 / f<2.

6.

8. The optical lens according to claim 1, characterized in that, The sag height SAG11 of the clear aperture half-diameter of the object side surface of the first lens and the center thickness CT1 of the first lens satisfy: 1.5<SAG11 / CT1<2.

4.

9. The optical lens according to claim 1, characterized in that, The clear aperture half-diameter CSD11 of the object side surface of the first lens and the clear aperture half-diameter CSD51 of the object side surface of the fifth lens satisfy: 1.4<CSD11 / CSD51<1.7.

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