Optical lens

Abstract

The application discloses an optical lens which comprises, in sequence from the object side to the image side along the optical axis, a first lens with negative optical power, a second lens with negative optical power, the object side surface of which is a convex surface or a concave surface, and the image side surface of which is a convex surface or a concave surface, a third lens with optical power, a fourth lens with optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface or a concave surface. When the object side surface of the second lens is a concave surface, and the image side surface thereof is a convex surface, the image side surface of the sixth lens is a convex surface; or when the object side surface of the second lens is a convex surface, and the image side surface thereof is a concave surface, the image side surface of the sixth lens is a concave surface. The optical lens satisfies the condition: |(R61+R62)xF6 / (R61-R62)|≤20mm.

Description

Technical Field

[0001] This application relates to the field of optical components, and more specifically, to an optical lens. Background Technology

[0002] With the continuous upgrading and development of internet technology, video camera systems are widely used in video conferencing, online teaching, and online video shooting, providing numerous conveniences for more and more consumers. At the same time, consumers are placing increasingly higher demands on the performance of the optical lenses mounted on video camera systems.

[0003] Currently, most optical lenses on the market struggle to effectively correct imaging aberrations, often resulting in poor image quality. Furthermore, most optical lenses are relatively long and bulky, leading to higher overall cost and weight. While achieving a wide field of view, most optical lenses suffer from poor distortion control, resulting in noticeable image distortion and negatively impacting post-processing.

[0004] Therefore, how to reasonably set the number of lenses, lens power, lens surface shape, and key technical parameters in an optical lens so that it can solve at least some of the shortcomings of existing technologies has become one of the urgent problems to be solved by many lens designers. Summary of the Invention

[0005] This application provides an optical lens comprising, along the optical axis from the object side to the image side, the following in sequence: a first lens with negative optical power; a second lens with negative optical power, the object side of which is convex or concave, and the image side of which is convex or concave; a third lens with optical power; a fourth lens with optical power; a fifth lens with positive optical power; and a sixth lens with negative optical power, the object side of which is concave, and the image side of which is convex or concave. When the object side of the second lens is concave and the image side is convex, the image side of the sixth lens is convex; or, when the object side of the second lens is convex and the image side is concave, the image side of the sixth lens is concave. The optical lens satisfies: |(R61+R62)×F6 / (R61-R62)|≤20mm, where F6 is the effective focal length of the sixth lens, R61 is the radius of curvature of the object side of the sixth lens, and R62 is the radius of curvature of the image side of the sixth lens.

[0006] In one embodiment, the optical lens may satisfy: -0.48≤R11 / F1≤-0.23, where R11 is the radius of curvature of the object side surface of the first lens, and F1 is the effective focal length of the first lens.

[0007] In one embodiment, the optical lens may satisfy: 3.09≤(R11+R12) / (R11-R12)≤3.81, where R11 is the radius of curvature of the object side of the first lens and R12 is the radius of curvature of the image side of the first lens.

[0008] In one embodiment, the optical lens may satisfy: 2.20≤|F23 / (d2+d3)|≤9.00, where F23 is the combined effective focal length of the second and third lenses, d2 is the center thickness of the second lens on the optical axis, and d3 is the center thickness of the third lens on the optical axis.

[0009] In one embodiment, the optical lens may satisfy: -1.49≤(R31+R32) / R22≤-0.45, where R22 is the radius of curvature of the image-side surface of the second lens, R31 is the radius of curvature of the object-side surface of the third lens, and R32 is the radius of curvature of the image-side surface of the third lens.

[0010] In one embodiment, the optical lens may satisfy: 2.65≤|F4 / (R41+R42)|≤5.39, where F4 is the effective focal length of the fourth lens, R41 is the radius of curvature of the object side of the fourth lens, and R42 is the radius of curvature of the image side of the fourth lens.

[0011] In one implementation, the optical lens can meet the following requirement: -6.93mm -1 ≤(Vd3+Vd4) / (F3+F4)≤-2.76mm -1 Where Vd3 is the Abbe number of the third lens, Vd4 is the Abbe number of the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens.

[0012] In one embodiment, the optical lens may satisfy: 0.37mm≤(R51+R52)×F5 / (R51-R52)≤2.27mm, where F5 is the effective focal length of the fifth lens, R51 is the radius of curvature of the object side of the fifth lens, and R52 is the radius of curvature of the image side of the fifth lens.

[0013] In one embodiment, the optical lens may satisfy: 0.40≤CT12 / CT45≤3.04, where CT12 is the air gap between the first lens and the second lens on the optical axis, and CT45 is the air gap between the fourth lens and the fifth lens on the optical axis.

[0014] In one embodiment, the optical lens may satisfy: -11.52≤F2 / F≤-2.49, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens.

[0015] In one embodiment, the optical lens may satisfy: 0.72≤F5 / F≤1.00, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens.

[0016] In one embodiment, the optical lens may satisfy: -1.50≤F6 / F≤-0.97, where F6 is the effective focal length of the sixth lens and F is the total effective focal length of the optical lens.

[0017] In one embodiment, the optical lens may satisfy: 2.97≤TTL / F≤3.05, where TTL is the distance on the optical axis from the object side of the first lens to the imaging plane of the optical lens, and F is the total effective focal length of the optical lens.

[0018] In one embodiment, the optical lens may satisfy: 0.27≤BFL / TTL≤0.30, where BFL is the distance on the optical axis from the image side of the sixth lens to the imaging surface of the optical lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens.

[0019] In one embodiment, the optical lens may satisfy: 2.42≤CTmax / CTmin≤4.03, where CTmax is the center thickness of the lens with the largest center thickness among the first to sixth lenses on the optical axis, and CTmin is the center thickness of the lens with the smallest center thickness among the first to sixth lenses on the optical axis.

[0020] In one embodiment, the object-side surface of the first lens is convex and the image-side surface is concave; the image-side surface of the third lens is convex; the object-side surface of the fourth lens is convex; and the object-side surface of the fifth lens is convex and the image-side surface is convex.

[0021] In the exemplary embodiments of this application, by reasonably setting the optical power, surface shape, and main technical parameters of each lens, the optical lens provided by this application can have at least one of the beneficial effects such as high resolution, miniaturization, low cost, and low distortion. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application;

[0024] Figure 2 The distortion curve of the optical lens of Embodiment 1 of this application is shown;

[0025] Figure 3 This is a schematic diagram of the structure of an optical lens according to Embodiment 2 of this application;

[0026] Figure 4 The distortion curve of the optical lens of Embodiment 2 of this application is shown;

[0027] Figure 5 This is a schematic diagram of the structure of the optical lens according to Embodiment 3 of this application;

[0028] Figure 6 The distortion curve of the optical lens of Embodiment 3 of this application is shown;

[0029] Figure 7 This is a schematic diagram of the structure of an optical lens according to Embodiment 4 of this application; and

[0030] Figure 8 The distortion curve of the optical lens of Embodiment 4 of this application is shown. Detailed Implementation

[0031] 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 exemplary 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.

[0032] 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 this application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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 formalized sense, unless expressly so specified herein.

[0037] 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.

[0038] The features, principles and other aspects of this application are described in detail below.

[0039] An optical lens according to an exemplary embodiment of this application may include six lenses with optical power, namely a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. These six lenses are arranged sequentially along the optical axis from the object side to the image side.

[0040] In an exemplary embodiment, the first lens may have negative optical power. The object-side surface of the first lens may be convex, and the image-side surface may be concave. This configuration of optical power and surface shape of the first lens can effectively control the head aperture of the optical lens, which is beneficial for achieving lens miniaturization design. At the same time, it can converge incident light rays with a large field of view into the optical lens as much as possible, thereby expanding the field of view of the optical lens.

[0041] In an exemplary embodiment, the second lens may have negative optical power. The object-side surface of the second lens may be convex or concave, and the image-side surface may be convex or concave. For example, the object-side surface of the second lens is concave, and the image-side surface is convex; or the object-side surface of the second lens is convex, and the image-side surface is concave.

[0042] In an exemplary embodiment, the third lens may have positive or negative optical power. The object-side surface of the third lens may be convex or concave, and the image-side surface may be convex. This configuration of optical power and surface shape of the third lens facilitates the smooth transmission of light, effectively corrects spherical aberration and field curvature of the optical lens, and greatly improves the imaging performance of the optical lens.

[0043] In an exemplary embodiment, the fourth lens may have positive or negative optical power. The object-side surface of the fourth lens may be convex, and the image-side surface may be convex or concave. Exemplarily, the fourth lens and the third lens may have optical powers with different positive and negative attributes. By rationally combining the fourth and third lenses with optical powers of different positive and negative attributes, this application can effectively control the direction of light, enabling smooth light transmission, effectively correcting spherical aberration and coma of the optical lens, and greatly improving the imaging performance of the optical lens.

[0044] In an exemplary embodiment, the fifth lens may have positive optical power. The object-side surface of the fifth lens may be convex, and the image-side surface may also be convex. This configuration of optical power and surface shape of the fifth lens is beneficial for suppressing astigmatism and for correcting spherical aberration and marginal aberration, thereby improving the imaging quality of the optical lens.

[0045] In an exemplary embodiment, the sixth lens may have negative optical power. The object-side surface of the sixth lens may be concave, and the image-side surface may be convex or concave. Exemplarily, the object-side surface of the sixth lens is concave, and the image-side surface is convex; or the object-side surface of the sixth lens is concave, and the image-side surface is concave. This optical power and surface configuration of the sixth lens facilitates a smooth transition of light from the sixth lens to the imaging surface, effectively suppressing astigmatism, balancing various aberrations of the optical lens, and effectively correcting optical distortion in the off-axis field of view. This helps reduce image distortion and significantly improves the imaging performance of the optical lens.

[0046] In one exemplary embodiment of this application, the object-side surface of the second lens is concave, and the image-side surface is convex, while the object-side surface of the sixth lens is concave, and the image-side surface is convex. The combination of the concave-convex second lens and the concave-convex sixth lens effectively controls the trajectory of incident light from the optical lens, better balances various aberrations of the optical lens, and effectively corrects optical distortion, ensuring that the absolute value of optical distortion is less than or equal to 2.05%, reducing image distortion and improving the imaging quality of the optical lens.

[0047] In another exemplary embodiment of this application, the object-side surface of the second lens is convex, and the image-side surface is concave, while the object-side surface and image-side surface of the sixth lens are both concave. The combination of the convex-concave second lens and the concave-concave sixth lens effectively controls the trajectory of incident light from the optical lens, better balances spherical aberration and field curvature, and effectively corrects optical distortion, ensuring that the absolute value of optical distortion is less than or equal to 2.05%, thus reducing image distortion and improving the imaging quality of the optical lens.

[0048] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: |(R61+R62)×F6 / (R61-R62)|≤20mm, where F6 is the effective focal length of the sixth lens, R61 is the radius of curvature of the object-side surface of the sixth lens, and R62 is the radius of curvature of the image-side surface of the sixth lens. By satisfying |(R61+R62)×F6 / (R61-R62)|≤20mm, the relationship between the radius of curvature of the object-side surface of the sixth lens, the radius of curvature of the image-side surface of the sixth lens, and the effective focal length of the sixth lens can be reasonably configured to effectively control the direction of light, allowing light to transition smoothly from the sixth lens to the imaging plane. This reduces the tolerance sensitivity of the sixth lens, improves the assembly yield of the lens, and by controlling the shape of the sixth lens, effectively corrects the optical distortion of the optical lens, ensuring that the absolute value of the optical distortion is less than or equal to 2.05%, reducing the degree of image distortion, and better restoring the realism of objects, thus achieving low distortion.

[0049] In an exemplary embodiment, the optical lens according to this application satisfies: -0.48 ≤ R11 / F1 ≤ -0.23, where R11 is the radius of curvature of the object-side surface of the first lens, and F1 is the effective focal length of the first lens. By satisfying -0.48 ≤ R11 / F1 ≤ -0.23, the ratio of the radius of curvature of the object-side surface of the first lens to the effective focal length of the first lens can be reasonably configured to allow large-angle light rays to converge into the optical lens, effectively expanding the field of view of the optical lens.

[0050] In an exemplary embodiment, the optical lens according to this application satisfies: 3.09 ≤ (R11 + R12) / (R11 - R12) ≤ 3.81, where R11 is the radius of curvature of the object-side surface of the first lens, and R12 is the radius of curvature of the image-side surface of the first lens. By satisfying 3.09 ≤ (R11 + R12) / (R11 - R12) ≤ 3.81, the first lens can converge more incident light rays and improve the imaging brightness of the optical lens by reasonably controlling the radii of curvature of the object-side and image-side surfaces of the first lens.

[0051] In an exemplary embodiment, the optical lens according to this application satisfies: 2.20 ≤ |F23 / (d2+d3)| ≤ 9.00, where F23 is the combined effective focal length of the second and third lenses, d2 is the center thickness of the second lens on the optical axis, and d3 is the center thickness of the third lens on the optical axis. Satisfying 2.20 ≤ |F23 / (d2+d3)| ≤ 9.00 allows for smooth light transmission by rationally configuring the ratio between the combined effective focal length of the second and third lenses and their center thicknesses, effectively correcting spherical aberration and field curvature of the optical lens, and significantly improving its imaging performance.

[0052] In an exemplary embodiment, the optical lens according to this application satisfies: -1.49 ≤ (R31 + R32) / R22 ≤ -0.45, where R22 is the radius of curvature of the image-side surface of the second lens, R31 is the radius of curvature of the object-side surface of the third lens, and R32 is the radius of curvature of the image-side surface of the third lens. By satisfying -1.49 ≤ (R31 + R32) / R22 ≤ -0.45, the maximum light transmission can be effectively guaranteed and the illuminance of the optical lens can be improved by reasonably adjusting the radii of curvature of the image-side surface of the second lens, the object-side surface of the third lens, and the image-side surface of the third lens.

[0053] In an exemplary embodiment, the optical lens according to this application satisfies: 2.65 ≤ |F4 / (R41+R42)| ≤ 5.39, where F4 is the effective focal length of the fourth lens, R41 is the radius of curvature of the object-side surface of the fourth lens, and R42 is the radius of curvature of the image-side surface of the fourth lens. Satisfying 2.65 ≤ |F4 / (R41+R42)| ≤ 5.39 allows for effective control of light path by rationally configuring the effective focal length of the fourth lens and the radii of curvature of its object-side and image-side surfaces, enabling smooth light transmission. This effectively corrects spherical aberration and coma in the optical lens, significantly improving its imaging performance.

[0054] In an exemplary embodiment, the optical lens according to this application satisfies: -6.93mm -1 ≤(Vd3+Vd4) / (F3+F4)≤-2.76mm -1 Where Vd3 is the Abbe number of the third lens, Vd4 is the Abbe number of the fourth lens, F3 is the effective focal length of the third lens, and F4 is the effective focal length of the fourth lens. This satisfies -6.93mm. -1 ≤(Vd3+Vd4) / (F3+F4)≤-2.76mm -1 By properly combining the optical power and Abbe number of the third and fourth lenses, chromatic aberration in the lens can be effectively corrected and the saturation of the lens colors can be improved.

[0055] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.37mm ≤ (R51 + R52) × F5 / (R51 - R52) ≤ 2.27mm, where F5 is the effective focal length of the fifth lens, R51 is the radius of curvature of the object-side surface of the fifth lens, and R52 is the radius of curvature of the image-side surface of the fifth lens. By satisfying 0.37mm ≤ (R51 + R52) × F5 / (R51 - R52) ≤ 2.27mm, the relationship between the radius of curvature of the object-side surface of the fifth lens, the radius of curvature of the image-side surface of the fifth lens, and the effective focal length of the fifth lens can be reasonably configured to effectively control the direction of light, reduce the deflection angle between the incident and outgoing light rays of the fifth lens, allow the light to enter the rear of the optical lens smoothly, reduce lens tolerance sensitivity, and improve lens yield.

[0056] In an exemplary embodiment, the optical lens according to this application satisfies: 0.40≤CT12 / CT45≤3.04, where CT12 is the air gap between the first and second lenses on the optical axis, and CT45 is the air gap between the fourth and fifth lenses on the optical axis. In this application, while meeting the lens imaging quality requirements, satisfying 0.40≤CT12 / CT45≤3.04 can be achieved by reasonably controlling the air gaps between the first and second lenses on the optical axis, as well as the air gaps between the fourth and fifth lenses on the optical axis, so as to minimize the air gap between adjacent lenses, thereby facilitating the miniaturization of the lens design.

[0057] In an exemplary embodiment, the optical lens according to this application satisfies: -11.52 ≤ F2 / F ≤ -2.49, where F2 is the effective focal length of the second lens and F is the total effective focal length of the optical lens. More specifically, F2 and F can further satisfy: -7.5 ≤ F2 / F ≤ -2.49. Satisfying -11.52 ≤ F2 / F ≤ -2.49 allows for a more stable flow of light into the optical lens by rationally configuring the relationship between the effective focal length of the second lens and the total effective focal length of the lens. This controls the light path, helps correct various aberrations, improves the image quality of the lens, and effectively regulates the optical distortion at the edge of the field of view, keeping the distortion within a reasonable range.

[0058] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 0.72 ≤ F5 / F ≤ 1.00, where F5 is the effective focal length of the fifth lens and F is the total effective focal length of the optical lens. Satisfying 0.72 ≤ F5 / F ≤ 1.00 allows for the suppression of astigmatism by reasonably adjusting the relationship between the effective focal length of the fifth lens and the total effective focal length of the lens. It also facilitates the correction of spherical aberration and marginal aberration, thereby improving the imaging quality of the optical lens.

[0059] In an exemplary embodiment, the optical lens according to this application satisfies: -1.50≤F6 / F≤-0.97, where F6 is the effective focal length of the sixth lens and F is the total effective focal length of the optical lens. Satisfying -1.50≤F6 / F≤-0.97 allows for effective correction of off-axis optical distortion by rationally configuring the relationship between the effective focal length of the sixth lens and the total effective focal length of the lens. This results in an absolute value of optical distortion less than or equal to 2.05%, significantly reducing image distortion and effectively correcting various aberrations such as spherical aberration and coma, thereby improving the lens's imaging performance.

[0060] In an exemplary embodiment, the optical lens according to this application satisfies the following condition: 2.97 ≤ TTL / F ≤ 3.05, where TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging plane of the optical lens, and F is the total effective focal length of the optical lens. Satisfying 2.97 ≤ TTL / F ≤ 3.05 allows the distance TTL from the object-side surface of the first lens to the imaging plane of the optical lens to be controlled within a reasonable range while ensuring a certain total effective focal length. This results in a smaller overall length for the optical lens, which is beneficial for lens miniaturization. For example, the distance TTL from the object-side surface of the first lens to the imaging plane of the optical lens can satisfy: TTL < 23 mm.

[0061] In an exemplary embodiment, the optical lens according to this application satisfies: 0.27 ≤ BFL / TTL ≤ 0.30, where BFL is the distance on the optical axis from the image-side surface of the sixth lens to the imaging surface of the optical lens, and TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical lens. Satisfying 0.27 ≤ BFL / TTL ≤ 0.30 allows for a more efficient improvement in the assembly yield of the optical lens by reasonably controlling the distance BFL between the image-side surface of the sixth lens and the imaging surface of the optical lens, while ensuring that the distance TTL between the object-side surface of the first lens and the imaging surface of the optical lens is constant. It also allows for more space to be reserved for the installation of other components in the optical lens, thereby increasing the design flexibility of the optical lens.

[0062] In an exemplary embodiment, the optical lens according to this application satisfies: 2.42 ≤ CTmax / CTmin ≤ 4.03, where CTmax is the center thickness of the lens with the largest center thickness among the first to sixth lenses on the optical axis, and CTmin is the center thickness of the lens with the smallest center thickness among the first to sixth lenses on the optical axis. More specifically, CTmax and CTmin can further satisfy: 3 ≤ CTmax / CTmin ≤ 4.03. Satisfying 2.42 ≤ CTmax / CTmin ≤ 4.03 allows for more stable operation of each lens by reasonably controlling the thickness of each lens in the optical lens, thereby minimizing changes in light trajectory under high and low temperature environments and achieving heat-free operation of the lens.

[0063] In an exemplary embodiment, the optical lens according to this application may further include an aperture stop, which may be located between the second lens and the third lens; or between the third lens and the fourth lens. By placing the aperture stop between the second lens and the third lens or between the third lens and the fourth lens, this application can effectively concentrate the light entering the optical lens, shorten the total length of the optical lens, reduce the maximum aperture of the optical lens, and facilitate the miniaturization design of the optical lens.

[0064] In an exemplary embodiment, the second, fifth, and sixth lenses may be plastic lenses. The first, third, and fourth lenses may be glass lenses or plastic lenses. This application, by employing a hybrid combination of glass and plastic lenses, helps to reduce costs and enables the lens to operate normally in both high and low temperature environments, achieving high imaging quality within a temperature range such as -20℃ to 60℃.

[0065] In exemplary embodiments, the optical lens according to this application may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging plane. This application proposes an optical lens with characteristics such as high resolution, miniaturization, low cost, low distortion, small size, good temperature performance, and high image quality. The optical lens according to the above embodiments of this application can employ multiple lenses, such as the six lenses described above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, incident light can be effectively converged, the overall optical length of the imaging lens can be reduced, and the manufacturability of the imaging lens can be improved, making the optical lens more conducive to manufacturing.

[0066] In an exemplary embodiment, at least one of the object-side surface of the first lens to the image-side surface of the sixth lens is an aspherical mirror. An aspherical lens is characterized by a continuously changing curvature from the lens center to the lens periphery. Unlike a spherical lens, which has a constant curvature from the lens center to the lens periphery, an aspherical lens has better radius of curvature characteristics, offering advantages in improving distortion aberrations and astigmatism. Using an aspherical lens can eliminate aberrations occurring during imaging as much as possible, thereby improving image quality. Optionally, at least one of the object-side and image-side surfaces of at least four of the first, second, third, fourth, fifth, and sixth lenses is an aspherical mirror. Optionally, both the object-side and image-side surfaces of at least four lenses are aspherical mirrors. By setting multiple lenses as aspherical lenses, this application facilitates the correction of lens distortion, ensuring that the absolute value of the lens's optical distortion is less than or equal to 2.05%.

[0067] However, those skilled in the art will understand that the number of lenses constituting the optical lens can be varied to obtain the various results and advantages described herein without departing from the technical solutions claimed in this application. For example, although six lenses are described as an example in the embodiments, the optical lens is not limited to including six lenses. If desired, the optical lens may also include other numbers of lenses.

[0068] Specific embodiments of the optical lens applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0069] Example 1

[0070] The following is for reference Figure 1 and Figure 2 The optical lens according to Embodiment 1 of this application is described. Figure 1 This is a schematic diagram of the structure of an optical lens according to Embodiment 1 of this application.

[0071] like Figure 1 As shown, the optical lens, from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and / or protective glass CG, and an imaging surface.

[0072] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has negative optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens L4 has negative optical power, with a convex object-side surface and a concave image-side surface. The fifth lens L5 has positive optical power, with a convex object-side surface and a convex image-side surface. The sixth lens L6 has negative optical power, with a concave object-side surface and a convex image-side surface. Light from the object passes sequentially through each surface (i.e., sequentially through the object-side surface of the first lens L1 to the image-side surface of the filter and / or protective glass CG) and is finally imaged on the imaging surface, where an image sensor chip IMA can be disposed.

[0073] Table 1 shows the basic parameters of the optical lens of Example 1, where the units for radius of curvature and thickness / distance are millimeters (mm).

[0074]

[0075]

[0076] Table 1

[0077] In this example, surface 11 is the object-side surface of the first lens, and surface 12 is the image-side surface of the first lens. Surface 21 is the object-side surface of the second lens, and surface 22 is the image-side surface of the second lens. Surface 31 is the object-side surface of the third lens, and surface 32 is the image-side surface of the third lens. Surface 41 is the object-side surface of the fourth lens, and surface 42 is the image-side surface of the fourth lens. Surface 51 is the object-side surface of the fifth lens, and surface 52 is the image-side surface of the fifth lens. Surface 61 is the object-side surface of the sixth lens, and surface 62 is the image-side surface of the sixth lens. Surface 71 is the object-side surface of the filter, and surface 72 is the image-side surface of the filter.

[0078] In this example, the aperture stop STO can be located between the second lens L2 and the third lens L3. The aperture value FNO of the optical lens is 2.20, and the absolute value of the optical distortion of the optical lens is 1.88%.

[0079] In Example 1, the object-side surface and image-side surface of any one of the first lens L1, the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are both aspherical. The surface shape z of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0080]

[0081] Where z is the distance vector from the vertex of the aspherical surface at a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the quadratic surface constant of the aspherical surface; A4, A6, A8, A 10 A 12 A 14 A 16 These are the aspherical coefficients of orders 4, 6, 8, 10, 12, 14, and 16, respectively. Table 2 below gives the quadratic surface constants k and higher-order coefficients A4, A6, A8, and A6 that can be used for the aspherical mirror surfaces 11-22 and 41-62 in Example 1. 10 A 12 A 14 A 16 .

[0082]

[0083]

[0084] Table 2

[0085] Figure 2 The distortion curve of the optical lens of Embodiment 1 is shown, representing the distortion magnitude values ​​corresponding to different image heights. According to... Figure 2 It can be seen that the optical lens given in Example 1 can achieve good imaging quality.

[0086] Example 2

[0087] The following is for reference Figure 3 and Figure 4 This paper describes an optical lens according to Embodiment 2 of this application. For the sake of brevity, descriptions similar to those in Embodiment 1 will be omitted in this embodiment and the following embodiments. Figure 3 A schematic diagram of the structure of an optical lens according to Embodiment 2 of this application is shown.

[0088] like Figure 3 As shown, the optical lens, from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, an aperture stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and / or protective glass CG, and an imaging surface.

[0089] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has negative optical power, with a concave object-side surface and a convex image-side surface. The third lens L3 has positive optical power, with a convex object-side surface and a convex image-side surface. The fourth lens L4 has negative optical power, with a convex object-side surface and a concave image-side surface. The fifth lens L5 has positive optical power, with a convex object-side surface and a convex image-side surface. The sixth lens L6 has negative optical power, with a concave object-side surface and a convex image-side surface. Light from the object passes sequentially through each surface (i.e., sequentially through the object-side surface of the first lens L1 to the image-side surface of the filter and / or protective glass CG) and is finally imaged on the imaging surface, where an image sensor chip IMA can be disposed.

[0090] In this example, the aperture stop STO can be located between the second lens L2 and the third lens L3. The aperture value FNO of the optical lens is 2.20, and the absolute value of the optical distortion of the optical lens is 2.04%.

[0091] Table 3 shows the basic parameters of the optical lens in Example 2, where the units for radius of curvature and thickness / distance are millimeters (mm). Table 4 shows the quadratic surface constant k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface in Example 2. 10 A 12 A 14 A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0092]

[0093]

[0094] Table 3

[0095] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 11 -0.15 3.85E-04 -5.21E-05 9.42E-06 -1.78E-06 1.62E-07 -8.18E-09 1.63E-10 Surface 12 -0.65 3.84E-03 -6.42E-05 9.24E-05 -2.71E-05 3.75E-06 -2.46E-07 -5.24E-09 Surface 21 -0.28 2.49E-03 2.66E-05 1.05E-04 -8.02E-05 2.52E-05 -4.11E-06 2.58E-07 Surface 22 -0.12 1.38E-03 1.77E-04 3.22E-05 -2.40E-05 6.24E-06 -8.25E-07 4.38E-08 Surface 41 -0.70 -6.32E-03 1.11E-03 -7.71E-05 -2.00E-06 9.39E-07 -9.99E-08 4.94E-09 Surface 42 -0.30 -1.34E-02 2.37E-03 -2.63E-04 2.15E-05 -1.56E-06 9.48E-08 -3.80E-09 Surface 51 -2.17 -2.68E-03 4.98E-04 -1.39E-05 -2.21E-06 2.35E-07 1.90E-08 -2.55E-09 Surface 52 0.60 3.04E-03 -4.29E-04 5.63E-05 -2.15E-06 3.32E-07 1.90E-09 -2.54E-09 Surface 61 0.72 1.00E-02 -1.71E-03 2.03E-04 -1.39E-05 1.01E-06 3.43E-09 -5.07E-09 Surface 62 49.44 8.43E-03 -1.05E-03 1.26E-04 -9.82E-06 7.90E-07 -6.56E-08 4.91E-09

[0096] Table 4

[0097] Figure 4 The distortion curve of the optical lens of Embodiment 2 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figure 4 It can be seen that the optical lens given in Example 2 can achieve good imaging quality.

[0098] Example 3

[0099] The following is for reference Figure 5 and Figure 6 The optical lens according to Embodiment 3 of this application is described. Figure 5 This is a schematic diagram of the structure of an optical lens according to Embodiment 3 of this application.

[0100] like Figure 5 As shown, the optical lens, from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and / or protective glass CG, and an imaging surface.

[0101] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has negative optical power, with a convex object-side surface and a concave image-side surface. The third lens L3 has negative optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has positive optical power, with a convex object-side surface and a convex image-side surface. The sixth lens L6 has negative optical power, with a concave object-side surface and a concave image-side surface. Light from the object passes sequentially through each surface (i.e., sequentially through the object-side surface of the first lens L1 to the image-side surface of the filter and / or protective glass CG) and is finally imaged on the imaging surface, where an image sensor chip (IMA) may be disposed.

[0102] In this example, the aperture stop STO can be located between the third lens L3 and the fourth lens L4. The aperture value FNO of the optical lens is 2.20, and the absolute value of the optical distortion of the optical lens is 2.02%.

[0103] Table 5 shows the basic parameters of the optical lens in Example 3, where the units for radius of curvature and thickness / distance are millimeters (mm). Table 6 shows the quadratic surface constant k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface in Example 3. 10 A 12 A 14 A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0104]

[0105] Table 5

[0106] Face number k A4 A6 A8 A10 A12 A14 A16 Surface 21 2.49 1.27E-03 7.02E-05 -1.17E-05 3.41E-06 -4.26E-07 1.57E-08 1.90E-09 Surface 22 -7.61 8.15E-03 -1.15E-04 1.66E-05 -1.60E-05 1.25E-05 -3.28E-06 2.95E-07 Surface 31 -0.86 8.52E-04 6.40E-04 -6.04E-04 2.95E-04 -8.19E-05 1.15E-05 -6.28E-07 Surface 32 0.27 4.10E-03 2.60E-04 -5.58E-05 2.08E-05 -2.78E-06 9.08E-08 8.49E-09 Surface 51 -4.93 1.82E-03 -1.78E-04 1.15E-05 -3.47E-06 5.88E-07 -5.42E-08 1.88E-09 Surface 52 -6.65 -2.11E-03 -2.27E-04 9.34E-05 -7.91E-06 -3.11E-07 6.94E-08 -2.50E-09 Surface 61 -30.59 -4.21E-03 1.18E-04 1.08E-04 -3.26E-06 -2.81E-06 3.73E-07 -1.44E-08 Surface 62 -31.77 4.17E-03 -5.14E-04 2.02E-04 -3.39E-05 2.94E-06 -1.34E-07 2.62E-09

[0107] Table 6

[0108] Figure 6 The distortion curve of the optical lens of Embodiment 3 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figure 6 It can be seen that the optical lens given in Example 3 can achieve good imaging quality.

[0109] Example 4

[0110] The following is for reference Figure 7 and Figure 8 The optical lens according to Embodiment 4 of this application is described. Figure 7 A schematic diagram of the structure of an optical lens according to Embodiment 4 of this application is shown.

[0111] like Figure 7 As shown, the optical lens, from the object side to the image side, includes, in sequence: a first lens L1, a second lens L2, a third lens L3, an aperture stop STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter and / or protective glass CG, and an imaging surface.

[0112] The first lens L1 has negative optical power, with a convex object-side surface and a concave image-side surface. The second lens L2 has negative optical power, with a convex object-side surface and a concave image-side surface. The third lens L3 has negative optical power, with a concave object-side surface and a convex image-side surface. The fourth lens L4 has positive optical power, with a convex object-side surface and a convex image-side surface. The fifth lens L5 has positive optical power, with a convex object-side surface and a convex image-side surface. The sixth lens L6 has negative optical power, with a concave object-side surface and a concave image-side surface. Light from the object passes sequentially through each surface (i.e., sequentially through the object-side surface of the first lens L1 to the image-side surface of the filter and / or protective glass CG) and is finally imaged on the imaging surface, where an image sensor chip (IMA) may be disposed.

[0113] In this example, the aperture stop STO can be located between the third lens L3 and the fourth lens L4. The aperture value FNO of the optical lens is 2.20, and the absolute value of the optical distortion of the optical lens is 2.02%.

[0114] Table 7 shows the basic parameters of the optical lens in Example 4, where the units for radius of curvature and thickness / distance are millimeters (mm). Table 8 shows the quadratic surface constant k and higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror in Example 4. 10 A 12 A 14 A 16 Each aspherical surface shape can be defined by formula (1) given in Example 1 above.

[0115]

[0116] Table 7

[0117]

[0118]

[0119] Table 8

[0120] Figure 8The distortion curve of the optical lens of Example 4 is shown, representing the distortion magnitude corresponding to different image heights. According to... Figure 8 It can be seen that the optical lens given in Example 4 can achieve good imaging quality.

[0121] In summary, Examples 1 to 4 satisfy the relationships shown in Table 9.

[0122] Conditional / Example 1 2 3 4 R11 / F1 -0.32 -0.27 -0.43 -0.44 (R11+R12) / (R11-R12) 3.50 3.67 3.22 3.19 F2 / F -3.78 -5.59 -10.23 -9.81 |F23 / (d2+d3)| 2.64 2.32 7.88 7.82 (R31+R32) / R22 -1.34 -0.60 -1.10 -1.10 |F4 / (R41+R42)| 5.00 3.12 3.04 3.05 <![CDATA[(Vd3+Vd4) / (F3+F4)(mm -1 )]]> -3.36 -6.33 -5.78 -5.85 F5 / F 0.77 0.77 0.97 0.97 F6 / F -1.26 -1.42 -1.05 -1.05 (R51+R52)×F5 / (R51-R52)(mm) 0.94 0.64 2.00 2.00 |(R61+R62)×F6 / (R61-R62)|(mm) 17.60 17.44 0.25 0.05 TTL / F 2.99 3.02 3.03 3.03 CT12 / CT45 2.79 2.65 0.41 0.49 BFL / TTL 0.29 0.28 0.29 0.29 CTmax / Ctmin 3.80 2.65 3.43 3.48

[0123] Table 9

[0124] This application also provides an imaging device, whose electronic photosensitive element can be a photocoupled device (CCD) or a complementary metal oxide semiconductor device (CMOS). The imaging device can be a stand-alone imaging device of a video camera system, or it can be an imaging module integrated into a mobile electronic device such as a video camera system. The camera system is equipped with the optical lens described above.

[0125] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical lens characterized in that, sequentially arranged from the object side to the image side along the optical axis include: a first lens having negative refractive power; a second lens having negative refractive power, an object side surface of which is convex or concave, and an image side surface of which is convex or concave; a third lens having refractive power; a fourth lens having refractive power; a fifth lens having positive refractive power; and a sixth lens having negative refractive power, an object side surface of which is concave, and an image side surface of which is convex or concave; wherein the image side surface of the sixth lens is convex when the object side surface of the second lens is concave and the image side surface of the second lens is convex, or the image side surface of the sixth lens is concave when the object side surface of the second lens is convex and the image side surface of the second lens is concave; and the third lens and the fourth lens have opposite refractive power properties; the optical lens has six lenses with refractive power; the optical lens satisfies 0.05 mm ≤ |(R61+R62)xF6 / (R61-R62)| ≤ 17.60 mm and 3.04 ≤ |F4 / (R41+R42)| ≤ 5.00, wherein F6 is an effective focal length of the sixth lens, R61 is a radius of curvature of the object side surface of the sixth lens, R62 is a radius of curvature of the image side surface of the sixth lens, F4 is an effective focal length of the fourth lens, R41 is a radius of curvature of the object side surface of the fourth lens, and R42 is a radius of curvature of the image side surface of the fourth lens.

2. The optical lens of claim 1, wherein, the optical lens satisfies -0.48 ≤ R11 / F1 ≤ -0.23, wherein R11 is a radius of curvature of the object side surface of the first lens, and F1 is an effective focal length of the first lens.

3. The optical lens of claim 1, wherein, the optical lens satisfies 3.09 ≤ (R11+R12) / (R11-R12) ≤ 3.81, wherein R11 is a radius of curvature of the object side surface of the first lens, and R12 is a radius of curvature of the image side surface of the first lens.

4. The optical lens of claim 1, wherein, the optical lens satisfies 2.20 ≤ |F23 / (d2+d3)| ≤ 9.00, wherein F23 is a combined effective focal length of the second lens and the third lens, d2 is a central thickness of the second lens on the optical axis, and d3 is a central thickness of the third lens on the optical axis.

5. The optical lens of claim 1, wherein, the optical lens satisfies -1.49 ≤ (R31+R32) / R22 ≤ -0.45, wherein R22 is a radius of curvature of the image side surface of the second lens, R31 is a radius of curvature of the object side surface of the third lens, and R32 is a radius of curvature of the image side surface of the third lens.

6. The optical lens of claim 1, wherein, The optical lens satisfies: -6.93 mm -1 ≤(Vd3+Vd4) / (F3+F4)≤-2.76 mm -1 wherein Vd3 is the Abbe number of the third lens, Vd4 is the Abbe number of the fourth lens, and F3 is the effective focal length of the third lens.

7. The optical lens of claim 1, wherein, the optical lens satisfies 0.37 mm ≤ (R51+R52)x F5 / (R51-R52) ≤ 2.27 mm, wherein F5 is an effective focal length of the fifth lens, R51 is a radius of curvature of the object side surface of the fifth lens, and R52 is a radius of curvature of the image side surface of the fifth lens.

8. The optical lens of claim 1, wherein, the optical lens satisfies 0.40 ≤ CT12 / CT45 ≤ 3.04, wherein CT12 is an air gap of the first lens and the second lens on the optical axis, and CT45 is an air gap of the fourth lens and the fifth lens on the optical axis.

9. The optical lens of claim 1, wherein, The optical lens satisfies: -11.52F2 / F≤-2.49, wherein F2 is an effective focal length of the second lens, and F is a total effective focal length of the optical lens.

10. The optical lens of claim 1, wherein, The optical lens satisfies: 0.72F5 / F≤1.00, wherein F5 is an effective focal length of the fifth lens, and F is a total effective focal length of the optical lens.

11. The optical lens of claim 1, wherein, The optical lens satisfies: -1.50F6 / F≤-0.97, wherein F6 is an effective focal length of the sixth lens, and F is a total effective focal length of the optical lens.

12. The optical lens of claim 1, wherein, The optical lens satisfies: 2.97TTL / F≤3.05, wherein TTL is a distance from an object side of the first lens to an imaging plane of the optical lens on the optical axis, and F is a total effective focal length of the optical lens.

13. The optical lens of claim 1, wherein, The optical lens satisfies: 0.27BFL / TTL≤0.30, wherein BFL is a distance from an image side of the sixth lens to the imaging plane of the optical lens on the optical axis, and TTL is the distance from the object side of the first lens to the imaging plane of the optical lens on the optical axis.

14. The optical lens of claim 1, wherein, The optical lens satisfies: 2.42CTmax / CTmin≤4.03, wherein CTmax is a central thickness of a lens having a maximum central thickness among the first lens to the sixth lens on the optical axis, and CTmin is a central thickness of a lens having a minimum central thickness among the first lens to the sixth lens on the optical axis.

15. The optical lens according to any one of claims 1-14, wherein, the object side of the first lens is a convex surface, and the image side is a concave surface; the image side of the third lens is a convex surface; the object side of the fourth lens is a convex surface; and the object side of the fifth lens is a convex surface, and the image side is a convex surface.

Images