CN114740605B - Optical lens, camera module and electronic equipment - Google Patents

Abstract

In the optical lens, camera module and electronic equipment disclosed by the present invention, the optical lens has seven lenses with refractive power in total, and the first lens, the second lens, the third lens, and the fourth lens are sequentially arranged along the optical axis from the object side to the image side. Lens, fifth lens, sixth lens and seventh lens; the first lens has negative refractive power, the second lens has refractive power, the third lens has refractive power, the fourth lens has positive refractive power, and the fifth lens has negative refractive power The sixth lens has positive refractive power, the seventh lens has negative refractive power, and the optical lens satisfies the following relationship: 4.4mm<TTL/TAN(HFOV)<5.7mm, TTL is the object side of the first lens to the The distance between the imaging surface of the optical lens and the optical axis, HFOV is half of the maximum field of view angle of the optical lens. The optical lens, camera module and electronic equipment provided by the present invention can realize light, thin and miniaturized design while realizing the large viewing angle design of the optical lens.

Description

Optical lenses, camera modules and electronic equipment

Technical Field

The present invention relates to the field of optical imaging technology, and in particular to an optical lens, a camera module and an electronic device.

Background Art

In recent years, with the development of science and technology, portable electronic products with camera functions have become more popular. Among them, wide-angle lenses have a larger shooting field of view and can take large scenes or panoramic photos within a limited distance, which can better meet the needs of users.

However, with the development of chip technology, the pixel size of photosensitive chips is getting smaller and smaller, and the imaging quality requirements of the corresponding optical lenses are getting higher and higher. In order to ensure the imaging quality, the traditional wide-angle camera module usually has a larger optical lens while expanding the viewing angle, which is difficult to meet the application requirements of electronic equipment to be thin and small.

Summary of the invention

The present invention provides an optical lens, a camera module and an electronic device, which can realize a light, thin and miniaturized design while realizing a wide viewing angle design of the optical lens.

To achieve the above-mentioned object, in a first aspect, the present invention discloses an optical lens, wherein the optical lens has seven lenses with refractive power, which are a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side along the optical axis;

The first lens has negative refractive power, the object side surface of the first lens is concave at the near optical axis, and the image side surface of the first lens is concave at the near optical axis;

The second lens has refractive power, the object side surface of the second lens is convex at the near optical axis, and the image side surface of the second lens is concave at the near optical axis;

The third lens has refractive power;

The fourth lens has positive refractive power, the object side surface of the fourth lens is convex at the near optical axis, and the image side surface of the fourth lens is convex at the near optical axis;

The fifth lens has negative refractive power, the object side surface of the fifth lens is concave at the near optical axis, and the image side surface of the fifth lens is concave at the near optical axis;

The sixth lens has positive refractive power; the object side surface of the sixth lens is concave at the near optical axis, and the image side surface of the sixth lens is convex at the near optical axis;

The seventh lens has negative refractive power, and the image side surface of the seventh lens is concave at the near optical axis;

The optical lens satisfies the following relationship:

4.4mm<TTL/TAN(HFOV)<5.7mm;

Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical lens on the optical axis, that is, the total optical length, and HFOV is half of the maximum field of view of the optical lens.

In the optical lens provided in the present application, the first lens has a negative refractive power, which helps to increase the field of view angle, so that the optical lens forms a configuration with a wide viewing angle, and can balance the aberrations generated to compress the total optical length; the object side surface of the first lens is a concave surface at the near optical axis, which is conducive to enhancing the refractive power of the first lens and maintaining a smaller total optical length under a configuration with a wide viewing angle; the image side surface of the first lens is a concave surface at the near optical axis, which is conducive to adjusting the angle at which light from the edge of the field of view enters the second lens to compress the total optical length of the optical lens; the object side surface of the second lens is a convex surface at the near optical axis, which is conducive to balancing the aberrations of the optical lens to improve the imaging quality; the image side surface of the second lens is a concave surface at the near optical axis, which is conducive to correcting the off-axis aberrations of the optical lens; the fourth lens has a positive refractive power, and its object side surface and image side surface are both convex surfaces at the near optical axis, which is conducive to The light-gathering ability of the optical lens is concentrated on the second lens, thereby increasing the range of light entering the optical lens to expand the field of view; the fifth lens has negative refractive power, and its object side and image side are both concave at the near optical axis, which is beneficial to balancing the positive refractive power of the fourth lens while correcting the chromatic aberration of the optical lens; the sixth lens has positive refractive power, and is configured with a surface configuration in which the object side is concave at the near optical axis and the image side is convex at the near optical axis, which is beneficial to reducing the sensitivity of the optical lens and correcting astigmatism to improve the imaging quality; the seventh lens has negative refractive power, which is beneficial to adjusting the shortest distance from the image side of the seventh lens to the imaging plane in the direction of the optical axis, thereby balancing the refractive power distribution of the first lens to the sixth lens to reduce aberrations such as spherical aberration and astigmatism. The image side of the seventh lens is concave at the near optical axis and can also ensure that the optical lens has a reasonable back focus.

That is to say, by selecting the appropriate number of lenses and reasonably configuring the refractive power and surface shape of each lens, it is not only possible to ensure that the optical lens has good surface shape matching and large viewing angle characteristics, but also conducive to shortening the total optical length of the optical lens and realizing a light, thin and miniaturized design. In addition, the optical lens satisfies the following relationship: when 4.4mm<TTL/TAN(HFOV)<5.7mm, when the conditional formula is met, the total optical length and maximum field of view of the optical lens can be reasonably configured, and the optical lens has a larger field of view, which meets the needs of wide-range shooting, while the optical lens has a smaller total optical length. If the upper limit of the relationship is exceeded, the maximum field of view angle of the optical lens will be too small, making it difficult to meet the large field of view characteristics and unable to shoot scenes with a large field of view. Alternatively, the total optical length of the optical lens will be too long, resulting in a camera module that is too large. When the value is below the lower limit, the maximum field of view angle of the optical lens will be too large, which can easily cause excessive off-axis field distortion and distortion of the periphery of the imaging surface, ultimately leading to a decrease in the imaging performance of the optical lens. Alternatively, the total optical length of the optical lens will be too short and the lens arrangement will be crowded, which is not conducive to the aberration correction of the optical lens.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 3.5<|f1/f+f7/f|<4.3; wherein f1 is the effective focal length of the first lens, f7 is the effective focal length of the seventh lens, and f is the effective focal length of the optical lens. By satisfying the above relationship, by reasonably controlling the relationship between the effective focal lengths of the first lens and the seventh lens and the effective focal length of the optical lens, it is possible to avoid excessive refractive power of the first lens and the seventh lens, which is beneficial to suppressing high-order aberrations caused by light in the edge field of view of the optical lens, improving the resolution of the optical lens, and thus improving the clarity of the imaging picture. If the upper limit of the relationship is exceeded, the effective focal length of the optical lens is too small, the depth of field of the optical lens is too shallow, and more depth information of the object side cannot be obtained; if the lower limit of the relationship is lower than the lower limit, the effective focal length of the first lens and the seventh lens is too large, the refractive power of the first lens and the seventh lens is too strong, and strong astigmatism and chromatic aberration are easily generated, which reduces the imaging quality of the optical lens.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 3.8<TTL/∑DT<4.4; wherein ∑DT is the sum of the air spacings of each adjacent two lenses from the first lens to the seventh lens on the optical axis. When the above relationship is satisfied, the air spacings and the total optical lengths of all lenses on the optical axis are reasonably configured, which is conducive to achieving the lightness, thinness and miniaturization of the optical lens, while having sufficient air gaps between the lenses to reduce the difficulty of lens assembly and improve the assembly yield of the optical lens. When the upper limit of the relationship is exceeded, the total optical length of the optical lens is too large, which is not conducive to the lightness, thinness and miniaturization of the optical lens; when the lower limit is below the lower limit of the relationship, the air spacings of the first lens to the seventh lens on the optical axis are too small, the lenses are compactly arranged, the light deflection space is insufficient, and the aberrations are difficult to correct.

As an optional implementation, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 1<SD72/SD11<1.4; wherein SD11 is half of the maximum effective aperture of the object side of the first lens, and SD72 is half of the maximum effective aperture of the image side of the seventh lens. By reasonably limiting the maximum effective aperture of the object side of the first lens and the maximum effective aperture of the image side of the seventh lens, the light of the edge field of view can enter the image side of the seventh lens from the object side of the first lens with a relatively slow change trend, thereby reducing the risk of distortion of the optical lens. If the upper limit of the relationship is exceeded, the maximum effective aperture of the image side of the seventh lens is large, and the main light exit angle of the edge field of view is too large, which is not conducive to correcting aberrations, or the maximum effective aperture of the first lens is small, and the amount of light entering the optical lens cannot be guaranteed, resulting in a relatively low relative brightness of the imaging surface; if the upper limit of the relationship is lower than the lower limit, the maximum effective aperture of the seventh lens of the optical lens is too small, making it difficult for the optical lens to have a large image surface characteristic and difficult to match a large-size photosensitive chip, thereby causing the final assembled camera module to be difficult to achieve high-pixel imaging.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.5<(SAG41+SAG42)/(SAG42-SAG41)<0.8; wherein SAG41 is the sag of the object side surface of the fourth lens at the maximum effective half-aperture, and SAG42 is the sag of the image side surface of the fourth lens at the maximum effective half-aperture. Satisfying the above relationship can effectively control the shapes of the object side surface and the image side surface of the fourth lens at the maximum effective half-aperture, that is, the surface shape will not be excessively curved, the light angle of the edge field of view will change too much, the assembly sensitivity of the optical lens will be large, the surface shape will not be overly flat, the ability to deflect light in the edge field of view will be weak, and it will be difficult to correct the aberrations of the first lens to the third lens.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 0.6<CT3/ET3<1.6; wherein CT3 is the thickness of the third lens on the optical axis, and ET3 is the distance from the maximum effective semi-aperture of the object side of the third lens to the maximum effective semi-aperture of the image side of the third lens in the direction of the optical axis, that is, the edge thickness. Satisfying the above relationship, the third lens maintains a suitable thickness ratio, which is conducive to the processing and molding of the third lens and reduces the difficulty of its assembly. Exceeding the upper limit of the relationship, the thickness of the third lens on the optical axis is too large, which is not conducive to shortening the total optical length of the optical lens and achieving a lightweight and miniaturized effect; when it is lower than the lower limit of the above relationship, the edge thickness of the third lens is too large, resulting in a low light convergence ability of the third lens, and it is unable to effectively balance the aberration of the first lens in the negative direction, thereby reducing the imaging resolution of the optical lens.

As an optional implementation, in the embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: 3.5<FNO*IMGH/f<4.4; wherein, FNO is the aperture number of the optical lens, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, and f is the effective focal length of the optical lens. Satisfying the above relationship is conducive to maintaining the aperture number, effective focal length and image height of the optical lens within an appropriate range. The optical lens has a larger aperture to meet the light throughput and a longer focal length to meet the depth of field requirements, and can be better combined with a photosensitive chip with a larger size to obtain more signals and improve the imaging resolution. Exceeding the upper limit of the relationship, the aperture number of the optical lens is too large and the aperture is too small, resulting in insufficient light throughput and dark corners; below the lower limit of the relationship, the effective focal length of the optical lens is too large, the depth of field of the optical lens is too shallow, and the image height of the optical lens is too small, which is not conducive to the optical lens adapting to larger and higher pixel photosensitive chips, affecting the imaging quality.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: -1.4<R51/R52<-1; wherein R51 is the radius of curvature of the object side surface of the fifth lens at the optical axis, and R52 is the radius of curvature of the image side surface of the fifth lens at the optical axis. When the above relationship is satisfied, the surface shapes of the object side surface and the image side surface of the fifth lens at the near optical axis are reasonably configured, which is conducive to maintaining a relatively uniform thickness of the fifth lens, and can reasonably balance the optical path difference between the edge light and the paraxial light of the optical lens, thereby reasonably correcting the field curvature and astigmatism.

As an optional implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relationship: -2.5<f5/f4<-2.1; wherein f5 is the effective focal length of the fifth lens, and f4 is the effective focal length of the fourth lens. The above relationship is satisfied, and by controlling the ratio of the effective focal length of the fifth lens to the effective focal length of the fourth lens, the spherical aberration contribution of the fifth lens and the fourth lens is kept within a reasonable range, which is beneficial to improving the imaging quality of the optical lens in the field of view area on the optical axis. If the relationship exceeds the upper limit, the refractive power of the fifth lens relative to the fourth lens is too large, causing the fifth lens and the fourth lens to produce more serious astigmatism, which is not conducive to improving the imaging quality; if the relationship is below the lower limit, the refractive power of the fifth lens relative to the fourth lens is too small, which is prone to produce larger edge aberrations and more serious chromatic aberrations, which is not conducive to improving the imaging resolution of the optical lens.

In a second aspect, the present invention discloses a camera module, the camera module comprising a photosensitive chip and the optical lens as described in the first aspect, the photosensitive chip being arranged on the image side of the optical lens. The camera module having the optical lens can realize a thin and light miniaturized design while realizing a wide viewing angle design of the optical lens.

In a third aspect, the present invention further discloses an electronic device, comprising a housing and a camera module as described in the second aspect, wherein the camera module is disposed in the housing. The electronic device having the camera module can realize a thin and light miniaturized design while realizing a wide viewing angle design of an optical lens.

Compared with the prior art, the present invention has the following beneficial effects:

The optical lens, camera module and electronic device provided by the embodiment of the present invention adopt a seven-piece lens. By selecting a suitable number of lenses and reasonably configuring the refractive power and surface shape of each lens, it can not only ensure that the optical lens has good surface shape matching and large viewing angle characteristics, but also help to shorten the total optical length of the optical lens and realize a light, thin and miniaturized design. The optical lens also satisfies the following relationship:

When 4.4mm<TTL/TAN(HFOV)<5.7mm, when the conditional expression is met, the total optical length and maximum field of view of the optical lens can be reasonably configured, and the optical lens has a larger field of view, which meets the needs of wide-range shooting while having a smaller total optical length. Exceeding the upper limit of the relationship will cause the maximum field of view of the optical lens to be too small, making it difficult to meet the large field of view characteristics and unable to shoot scenes with a large field of view, or the total optical length of the optical lens is too long, resulting in a camera module that is too large; when it is below the lower limit, the maximum field of view of the optical lens is too large, which can easily cause excessive off-axis field of view distortion and distortion on the periphery of the imaging surface, ultimately leading to a decrease in the imaging performance of the optical lens, or the total optical length of the optical lens is too short, and the lens arrangement is crowded, which is not conducive to the aberration correction of the optical lens.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG1 is a schematic diagram of the structure of an optical lens disclosed in a first embodiment of the present application;

FIG2 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present application;

FIG3 is a schematic diagram of the structure of an optical lens disclosed in a second embodiment of the present application;

FIG4 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the second embodiment of the present application;

FIG5 is a schematic diagram of the structure of an optical lens disclosed in a third embodiment of the present application;

FIG6 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the third embodiment of the present application;

FIG. 7 is a schematic diagram of the structure of an optical lens disclosed in a fourth embodiment of the present application;

FIG8 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the fourth embodiment of the present application;

FIG9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;

FIG10 is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm), and a distortion curve diagram (%) of the optical lens disclosed in the fifth embodiment of the present application;

FIG11 is a schematic structural diagram of a camera module disclosed in the invention;

FIG. 12 is a schematic diagram of the structure of the electronic device disclosed in the present invention.

DETAILED DESCRIPTION

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like are based on the directions or positional relationships shown in the drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

In addition, some of the above terms may be used to express other meanings in addition to indicating a direction or position relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

The technical solution of the present invention will be further described below in conjunction with embodiments and drawings.

Please refer to FIG. 1 . The present application provides an optical lens 100, which has seven lenses with refractive power, and are the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 from the object side to the image side along the optical axis O. When imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 from the object side of the first lens L1 in sequence and is finally imaged on the imaging surface IMG of the optical lens 100. Among them, the first lens L1 has negative refractive power, the second lens L2 and the third lens L3 both have positive refractive power or negative refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, and the seventh lens L7 has negative refractive power.

Furthermore, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 and the image-side surface S6 of the third lens L3 can both be convex or concave at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the image-side surface S8 of the fourth lens L4 is concave at the near optical axis. The image-side surface S8 of L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 can be convex or concave, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

In the optical lens 100 provided in the present application, the first lens L1 has a negative refractive power, which helps to increase the field of view angle, so that the optical lens 100 forms a configuration with a wide viewing angle, and can balance the aberrations generated to compress the total optical length; the object side surface S1 of the first lens L1 is a concave surface at the near optical axis, which is conducive to enhancing the refractive power of the first lens L1 and maintaining a small total optical length under the configuration of a wide viewing angle; the image side surface S2 of the first lens L1 is a concave surface at the near optical axis, which is conducive to adjusting the angle at which the light of the edge field of view enters the second lens L2, so as to compress the total optical length of the optical lens 100; the object side surface S3 of the second lens L2 is a convex surface at the near optical axis, which is conducive to balancing the aberrations of the optical lens 100 to improve the imaging quality; the image side surface S4 of the second lens L2 is a concave surface at the near optical axis, which is conducive to correcting the off-axis aberration of the optical lens 100; the fourth lens L4 has a positive refractive power, and its object side surface and image side surface are both convex surfaces at the near optical axis, which is conducive to The light-gathering ability of the optical lens 100 is concentrated on the second lens L2, thereby increasing the range of light entering the optical lens 100 to expand the field of view; the fifth lens L5 has a negative refractive power, and its object-side surface and image-side surface are both concave at the near optical axis, which is beneficial to balancing the positive refractive power of the fourth lens L4 and correcting the chromatic aberration of the optical lens 100; the sixth lens L6 has a positive refractive power, and the surface configuration of the object-side surface being concave at the near optical axis and the image-side surface being convex at the near optical axis is beneficial to reducing the sensitivity of the optical lens 100 and correcting astigmatism to improve the imaging quality; the seventh lens L7 has a negative refractive power, which is beneficial to adjusting the shortest distance from the image-side surface S14 of the seventh lens L7 to the imaging surface IMG in the optical axis direction, thereby balancing the refractive power distribution of the first lens L1 to the sixth lens L6 to reduce aberrations such as spherical aberration and astigmatism, and the image-side surface S14 of the seventh lens L7 being concave at the near optical axis can also ensure that the optical lens 100 has a reasonable back focus.

In some embodiments, the material of each lens in the optical lens 100 can be glass or plastic. The use of plastic lenses can reduce the weight of the optical lens 100 and reduce production costs. The use of glass lenses enables the optical lens 100 to have excellent optical properties and high temperature resistance. It should be noted that the material of each lens in the optical lens 100 can also be any combination of glass and plastic, and it is not necessary to be all glass or all plastic. At the same time, the object side and image side of the aforementioned first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 and seventh lens L7 are all aspherical. The use of aspherical structures can improve the flexibility of lens design, effectively correct spherical aberration, and improve imaging quality. In other embodiments, the object side and image side of each lens of the optical lens 100 can also be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the object side and image side of each lens in the optical lens 100 can be any combination of aspherical or spherical surfaces.

It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there may be two or more lenses in the first lens L1. The two or more lenses can form a cemented lens. The surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and the surface closest to the image side can be regarded as the image side surface S2. Alternatively, the lenses in the first lens L1 do not form a cemented lens, but the distances between the lenses are relatively fixed. In this case, the object side surface of the lens closest to the object side is the object side surface S1, and the image side surface of the lens closest to the image side is the image side surface S2. In addition, in some embodiments, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, or the seventh lens L7 may be greater than or equal to two, and any adjacent lenses may form a cemented lens or a non-cemented lens.

In some embodiments, the optical lens 100 further includes a stop STO, which may be an aperture stop or a field stop, and may be disposed between the image side surface S6 of the third lens L3 and the object side surface S7 of the fourth lens L4 of the optical lens 100. It is understood that, in other embodiments, the stop STO may also be disposed between the object side of the optical lens 100 and the object side surface S1 of the first lens L1, or between two other adjacent lenses (for example, disposed between the image side surface S4 of the second lens L2 and the object side surface S5 of the third lens L3), and the specific setting may be adjusted according to actual conditions, and this embodiment is not limited thereto.

In some embodiments, the optical lens 100 further includes a filter L8, which may be an infrared cutoff filter or an infrared bandpass filter. The infrared cutoff filter is used to filter out infrared light, and the infrared bandpass filter only allows infrared light to pass. In the present application, the filter L8 is an infrared cutoff filter, which is arranged between the image side of the seventh lens L7 and the imaging surface IMG, and is relatively fixedly arranged with each lens in the optical lens 100, and is used to prevent infrared light from reaching the imaging surface IMG of the optical lens 100 and interfering with normal imaging. The filter L8 can be assembled together with each lens as a part of the optical lens 100. In other embodiments, the filter L8 can also be an independent element outside the optical lens 100. The filter L8 can be installed between the optical lens 100 and the photosensitive chip when the optical lens 100 and the photosensitive chip are assembled. It can be understood that the filter L8 can be made of optical glass coating, or can be made of colored glass, or a filter of other materials, which can be selected according to actual needs and is not specifically limited in this embodiment. In some other embodiments, a filter coating layer may be disposed on at least one of the first lens L1 to the seventh lens L7 to filter out infrared light.

In some embodiments, the optical lens 100 satisfies the following relationship: 4.4mm<TTL/TAN(HFOV)<5.7mm; wherein TTL is the distance from the object-side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, and HFOV is half of the maximum field of view of the optical lens 100. Specifically, TTL/TAN(HFOV) can be 4.45, 4.75, 5.05, 5.35 or 5.65, etc., in mm.

When the conditional expression is satisfied, the total optical length and the maximum field angle of the optical lens 100 can be reasonably configured, and the optical lens 100 has a larger field angle, which meets the needs of wide-range shooting, while the optical lens 100 has a smaller total optical length. Exceeding the upper limit of the relationship will cause the maximum field angle of the optical lens 100 to be too small, making it difficult to meet the large field characteristics and unable to shoot scenes with a large field of view, or the total optical length of the optical lens 100 is too long, resulting in a camera module that is too large; when it is below the lower limit, the maximum field angle of the optical lens 100 is too large, which can easily cause excessive off-axis field distortion, and distortion of the periphery of the imaging surface IMG, which ultimately leads to a decrease in the imaging performance of the optical lens 100, or the total optical length of the optical lens 100 is too short, and the lens arrangement is crowded, which is not conducive to the aberration correction of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5<|f1/f+f7/f|<4.3, wherein f1 is the effective focal length of the first lens L1, f7 is the effective focal length of the seventh lens L7, and f is the effective focal length of the optical lens 100. Specifically, |f1/f+f7/f| can be 3.55, 3.73, 3.9, 4.08 or 4.25, etc.

When the above relationship is satisfied, by reasonably controlling the relationship between the effective focal lengths of the first lens L1 and the seventh lens L7 and the effective focal length of the optical lens 100, it is possible to avoid the refractive power of the first lens L1 and the seventh lens L7 being too strong, which is beneficial to suppressing the high-order aberrations caused by the light of the edge field of view of the optical lens 100, improving the resolution of the optical lens 100, and further improving the clarity of the image. When the upper limit of the relationship is exceeded, the effective focal length of the optical lens 100 is too small, the depth of field of the optical lens 100 is too shallow, and more depth information of the object side cannot be obtained; when the lower limit of the relationship is exceeded, the effective focal length of the first lens L1 and the seventh lens L7 is too large, the refractive power of the first lens L1 and the seventh lens L7 is too strong, and it is easy to produce strong astigmatism and chromatic aberration, thereby reducing the image quality of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.8<TTL/∑DT<4.4; wherein TTL is the distance from the object-side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 on the optical axis O, and ∑DT is the sum of the air intervals between each adjacent two lenses from the first lens L1 to the seventh lens L7 on the optical axis O. Specifically, TTL/∑DT may be 3.85, 3.98, 4.1, 4.23 or 4.35, etc.

When the above relationship is satisfied, the air spacing and the total optical length of all lenses on the optical axis are reasonably configured, which is conducive to realizing the thinness and miniaturization of the optical lens 100, and there is sufficient air gap between the lenses to reduce the difficulty of lens assembly and improve the assembly yield of the optical lens 100. When the upper limit of the relationship is exceeded, the total optical length of the optical lens 100 is too large, which is not conducive to the thinness and miniaturization of the optical lens 100; when the lower limit of the relationship is exceeded, the air spacing of the first lens L1 to the seventh lens L7 on the optical axis is too small, the lenses are compactly arranged, the light deflection space is insufficient, and the aberration is difficult to correct.

In some embodiments, the optical lens 100 satisfies the following relationship: 1<SD72/SD11<1.4; wherein SD11 is half of the maximum effective aperture of the object-side surface S1 of the first lens L1, and SD72 is half of the maximum effective aperture of the image-side surface S14 of the seventh lens L7. Specifically, SD72/SD11 can be 1.05, 1.13, 1.2, 1.28, or 1.35, etc.

By reasonably limiting the maximum effective aperture of the object side surface S1 of the first lens L1 and the maximum effective aperture of the image side surface of the seventh lens, the light of the edge field of view can enter the image side surface S14 of the seventh lens L7 from the object side surface S1 of the first lens L1 with a relatively slow change trend, thereby reducing the risk of distortion of the optical lens 100. If the maximum effective aperture of the image side surface S14 of the seventh lens L7 exceeds the upper limit of the relationship, the maximum effective aperture of the image side surface S14 of the seventh lens L7 is relatively large, and the main light emission angle of the edge field of view is too large, which is not conducive to correcting aberrations, or the maximum effective aperture of the first lens L1 is relatively small, and the amount of light entering the optical lens 100 cannot be guaranteed, resulting in a relatively low relative brightness of the imaging surface IMG; if the maximum effective aperture of the seventh lens L7 of the optical lens 100 is below the lower limit of the relationship, the maximum effective aperture of the seventh lens L7 of the optical lens 100 is too small, making it difficult for the optical lens 100 to have a large image surface characteristic and difficult to match a large-sized photosensitive chip, thereby making it difficult for the finally assembled camera module to achieve high-pixel imaging.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.5<(SAG41+SAG42)/(SAG42-SAG41)<0.8; wherein SAG41 is the sag height of the object side surface S7 of the fourth lens L4 at the maximum effective half-aperture, that is, the distance from the maximum effective half-aperture of the object side surface S7 of the fourth lens L4 to the intersection of the object side surface S7 of the fourth lens L4 and the optical axis O in the optical axis direction, and SAG42 is the sag height of the image side surface S8 of the fourth lens L4 at the maximum effective half-aperture, that is, the distance from the maximum effective half-aperture of the image-object side surface S8 of the fourth lens L4 to the intersection of the object side surface S8 of the fourth lens L4 and the optical axis O in the optical axis direction. Specifically, (SAG41+SAG42)/(SAG42-SAG41) can be 0.55, 0.6, 0.65, 0.7 or 0.75, etc.

When the above relationship is satisfied, the shapes of the object side surface and the image side surface of the fourth lens L4 at the maximum effective semi-aperture can be effectively controlled, that is, the surface shape will not be excessively curved, the angle of light in the edge field of view will not change too much, the assembly sensitivity of the optical lens 100 will be large, and the surface shape will not be excessively flat, the light deflection ability of the edge field of view will be weak, and it will be difficult to correct the aberrations of the first lens L1 to the third lens L3.

In some embodiments, the optical lens 100 satisfies the following relationship: 0.6<CT3/ET3<1.6; wherein CT3 is the thickness of the third lens L3 on the optical axis O, and ET3 is the distance from the maximum effective semi-aperture of the object-side surface S5 of the third lens L3 to the maximum effective semi-aperture of the image-side surface S6 of the third lens L3 in the optical axis direction. Specifically, CT3/ET3 can be 0.65, 0.88, 1.1, 1.33 or 1.55, etc.

When the above relationship is satisfied, the third lens L3 maintains a suitable thickness ratio, which is conducive to the processing and molding of the third lens L3 and reduces the difficulty of its assembly. When the thickness exceeds the upper limit of the relationship, the thickness of the third lens L3 on the optical axis is too large, which is not conducive to shortening the total optical length of the optical lens 100 and achieving a light, thin and miniaturized effect; when it is lower than the lower limit of the above relationship, the edge thickness of the third lens L3 is too large, resulting in a low light convergence ability of the third lens L3, which cannot effectively balance the aberration of the first lens L1 in the negative direction, and reduces the imaging resolution of the optical lens 100.

In some embodiments, the optical lens 100 satisfies the following relationship: 3.5<FNO*IMGH/f<4.4, wherein FNO is the aperture number of the optical lens 100, IMGH is half of the image height corresponding to the maximum field angle of the optical lens 100, and f is the effective focal length of the optical lens 100. Specifically, FNO*IMGH/f can be 3.55, 3.75, 3.95, 4.15 or 4.35, etc.

Satisfying the above relationship is conducive to maintaining the aperture number, effective focal length and image height of the optical lens 100 within an appropriate range. The optical lens 100 has a larger aperture to meet the light throughput and a longer focal length to meet the depth of field requirements, and can better combine with a photosensitive chip with a larger size to obtain more signals and improve the imaging resolution. If the upper limit of the relationship is exceeded, the aperture number of the optical lens 100 is too large and the aperture is too small, resulting in insufficient light throughput and dark corners; if the lower limit is below the lower limit of the relationship, the effective focal length of the optical lens 100 is too large, the depth of field of the optical lens 100 is too shallow, and the image height of the optical lens 100 is too small, which is not conducive to the optical lens 100 adapting to a larger size and a higher pixel photosensitive chip, affecting the imaging quality.

In some embodiments, the optical lens 100 satisfies the following relationship: -1.4<R51/R52<-1; wherein R51 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis, and R52 is the radius of curvature of the image-side surface S10 of the fifth lens L5 at the optical axis. Specifically, R51/R52 may be -1.35, -1.28, -1.2, -1.13 or -1.05, etc.

When the above relationship is satisfied, the object-side surface and the image-side surface of the fifth lens element L5 at the near optical axis are reasonably configured, which is beneficial for the fifth lens element L5 to maintain a relatively uniform thickness, and can reasonably balance the optical path difference between the edge light and the paraxial light of the optical lens 100, thereby reasonably correcting the field curvature and astigmatism.

In some embodiments, the optical lens 100 satisfies the following relationship: -2.5<f5/f4<-2.1, wherein f5 is the effective focal length of the fifth lens L5, and f4 is the effective focal length of the fourth lens L4. Specifically, f5/f4 can be -2.45, -2.38, -2.3, -2.23 or -2.15, etc.

When the above relationship is satisfied, the ratio of the effective focal length of the fifth lens L5 to the effective focal length of the fourth lens L4 is controlled, so that the spherical aberration contribution of the fifth lens L5 and the fourth lens L4 is kept within a reasonable range, which is beneficial to improving the imaging quality of the field of view area on the optical axis of the optical lens 100. If the upper limit of the relationship is exceeded, the refractive power of the fifth lens L5 relative to the fourth lens L4 is too large, causing the fifth lens L5 and the fourth lens L4 to produce more serious astigmatism, which is not conducive to improving the imaging quality; if the lower limit of the relationship is lower than the lower limit, the refractive power of the fifth lens L5 relative to the fourth lens L4 is too small, which is easy to produce larger edge aberrations and more serious chromatic aberrations, which is not conducive to improving the imaging resolution of the optical lens 100.

The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

First embodiment

As shown in FIG1 , FIG1 is a schematic diagram of the structure of an optical lens 100 provided in the first embodiment of the present application, and the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter L8, which are sequentially arranged along the optical axis O from the object side to the image side. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, and the seventh lens L7 has a negative refractive power. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be referred to the above-mentioned specific embodiments, and will not be repeated here.

Further, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is concave at the near optical axis, and the image-side surface S6 of the third lens L3 is convex at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, The image-side surface S8 of the fourth lens L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

Specifically, taking the effective focal length f of the optical lens 100 = 2.94 mm, half of the maximum field of view HFOV of the optical lens 100 = 58.64°, the total optical length TTL of the optical lens 100 = 8.92 mm, and the aperture number FNO of the optical lens 100 = 2.04 as an example, other parameters of the optical lens 100 are given in the following Table 1. Among them, the elements from the object side to the image side along the optical axis O of the optical lens 100 are arranged in the order of the elements from top to bottom in Table 1. In the same lens, the surface with a smaller surface number is the object side of the lens, and the surface with a larger surface number is the image side of the lens, such as surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The Y radius in Table 1 is the radius of curvature of the object side or image side of the corresponding surface number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side of the lens to the next surface on the optical axis O. The value of the aperture STO in the "Thickness" parameter column is the distance from the aperture STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis O) on the optical axis O. The default direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis O. When the value is negative, it indicates that the aperture STO is closer to the imaging surface IMG relative to the vertex of the next surface. If the thickness of the aperture STO is a positive value, the aperture STO is closer to the object surface relative to the vertex indicated by the next surface. It can be understood that the units of the Y radius, thickness, and effective focal length in Table 1 are all mm. And the reference wavelength of the effective focal length, refractive index, and Abbe number of each lens in Table 1 is 587.56nm.

Table 1

In the first embodiment, the object side surface and the image side surface of any lens of the first lens L1 to the seventh lens L7 are both aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., the paraxial curvature c is the reciprocal of the Y radius R in Table 1 above); K is the cone coefficient; Ai is the correction coefficient corresponding to the i-th high-order term of the aspheric surface. Table 2 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each aspheric mirror surface S1-S14 in the first embodiment.

Table 2

Please refer to (A) in FIG. 2 , which shows the spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 486.13 nm, 587.56 nm and 656.27 nm. In (A) in FIG. 2 , the abscissa along the X-axis direction represents the focus offset in mm, and the ordinate along the Y-axis direction represents the normalized field of view. It can be seen from (A) in FIG. 2 that the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

Please refer to (B) in FIG. 2 , which is a light astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 587.56 nm. The horizontal coordinate along the X-axis direction represents the focus offset, in units of mm, and the vertical coordinate along the Y-axis direction represents the image height, in units of mm. T represents the curvature of the imaging surface IMG in the meridian direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. It can be seen from (B) in FIG. 2 that at the wavelength of 587.56 nm, the astigmatism of the optical lens 100 is well compensated.

Please refer to (C) in FIG. 2 , which is a distortion curve of the optical lens 100 in the first embodiment at a wavelength of 587.56 nm. The abscissa along the X-axis direction represents the distortion, and the ordinate along the Y-axis direction represents the image height, in units of mm. It can be seen from (C) in FIG. 2 that at the wavelength of 587.56 nm, the distortion of the optical lens 100 is well corrected.

Second embodiment

Please refer to FIG. 3, which is a schematic diagram of the structure of the optical lens 100 of the second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter L8, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, and the seventh lens L7 has a negative refractive power. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be referred to the above-mentioned specific embodiments, and will not be repeated here.

Further, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is convex at the near optical axis, and the image-side surface S6 of the third lens L3 is convex at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, The image-side surface S8 of the fourth lens L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

In the second embodiment, the effective focal length f of the optical lens 100 is 2.44 mm, half of the maximum field of view HFOV of the optical lens 100 is 63.08°, the total optical length TTL of the optical lens 100 is 8.86 mm, and the aperture number FNO of the optical lens 100 is 2.06 as an example.

The other parameters in the second embodiment are given in the following Table 3, and the definitions of the parameters can be obtained from the description of the above embodiments, and are not repeated here. It can be understood that the units of the Y radius, thickness, and effective focal length in Table 3 are all mm. And the reference wavelength of the effective focal length, refractive index, and Abbe number of each lens in Table 3 is 587.56 nm.

Table 3

In the second embodiment, Table 4 gives the high-order coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 4

Please refer to FIG. 4 , which shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the second embodiment. For specific definitions, please refer to the first embodiment, which will not be repeated here. As can be seen from (A) in FIG. 4 , the spherical aberration value of the optical lens 100 in the second embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in FIG. 4 , at a wavelength of 587.56 nm, the astigmatism of the optical lens 100 is well compensated. As can be seen from (C) in FIG. 4 , at a wavelength of 587.56 nm, the distortion of the optical lens 100 is well corrected.

Third embodiment

Please refer to FIG. 5, which shows a schematic diagram of the structure of an optical lens 100 according to the third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, an aperture STO, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter L8, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, and the seventh lens L7 has a negative refractive power. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be referred to the above-mentioned specific embodiments, and will not be repeated here.

Further, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is convex at the near optical axis, and the image-side surface S6 of the third lens L3 is concave at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, The image-side surface S8 of the fourth lens L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

In the third embodiment, the effective focal length f of the optical lens 100 is 3.04 mm, half of the maximum field of view HFOV of the optical lens 100 is 57.55°, the total optical length TTL of the optical lens 100 is 8.8 mm, and the aperture number FNO of the optical lens 100 is 2.1.

The other parameters in the third embodiment are given in the following Table 5, and the definitions of the parameters can be derived from the above description, and are not repeated here. It can be understood that the units of the Y radius, thickness, and effective focal length in Table 5 are all mm. And the reference wavelength of the effective focal length, refractive index, and Abbe number of each lens in Table 5 is 587.56 nm.

Table 5

In the third embodiment, Table 6 gives the coefficients of the higher-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 6

Please refer to FIG. 6 , which shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the third embodiment. For specific definitions, please refer to the first embodiment, which will not be repeated here. As can be seen from (A) in FIG. 6 , the spherical aberration value of the optical lens 100 in the third embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in FIG. 6 , at a wavelength of 587.56 nm, the astigmatism of the optical lens 100 is well compensated. As can be seen from (C) in FIG. 6 , at a wavelength of 587.56 nm, the distortion of the optical lens 100 is well corrected.

Fourth embodiment

Please refer to FIG. 7, which is a schematic diagram of the structure of the optical lens 100 disclosed in the fourth embodiment of the present application. The optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter L8, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, and the seventh lens L7 has a negative refractive power. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be referred to the above-mentioned specific embodiments, and will not be repeated here.

Further, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is convex at the near optical axis, and the image-side surface S6 of the third lens L3 is concave at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, The image-side surface S8 of the fourth lens L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

In the fourth embodiment, the effective focal length f of the optical lens 100 is 3.05 mm, half of the maximum field of view HFOV of the optical lens 100 is 57.87°, the total optical length TTL of the optical lens 100 is 8.88 mm, and the aperture number FNO of the optical lens 100 is 2.12 as an example.

The other parameters in the fourth embodiment are given in the following Table 7, and the definitions of the parameters can be obtained from the above description, and are not repeated here. It can be understood that the units of the Y radius, thickness, and effective focal length in Table 7 are all mm. And the reference wavelength of the effective focal length, refractive index, and Abbe number of each lens in Table 7 is 587.56 nm.

Table 7

In the fourth embodiment, Table 8 gives the high-order coefficients that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical surface shape can be defined by the formula given in the first embodiment.

Table 8

Please refer to FIG8 , which shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the fourth embodiment. For specific definitions, please refer to the first embodiment, which will not be repeated here. As can be seen from (A) in FIG8 , the spherical aberration value of the optical lens 100 in the fourth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in FIG8 , at a wavelength of 587.56 nm, the astigmatism of the optical lens 100 is well compensated. As can be seen from (C) in FIG8 , at a wavelength of 587.56 nm, the distortion of the optical lens 100 is well corrected.

Fifth embodiment

Please refer to FIG9, which is a schematic diagram of the structure of the optical lens 100 disclosed in the fifth embodiment of the present application. The optical lens 100 includes a stop STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7 and a filter L8, which are arranged in sequence from the object side to the image side along the optical axis O. Among them, the first lens L1 has a negative refractive power, the second lens L2 has a positive refractive power, the third lens L3 has a negative refractive power, the fourth lens L4 has a positive refractive power, the fifth lens L5 has a negative refractive power, the sixth lens L6 has a positive refractive power, and the seventh lens L7 has a negative refractive power. The materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 can be referred to the above-mentioned specific embodiments, and will not be repeated here.

Further, the object-side surface S1 of the first lens L1 is concave at the near optical axis, and the image-side surface S2 of the first lens L1 is concave at the near optical axis; the object-side surface S3 of the second lens L2 is convex at the near optical axis, and the image-side surface S4 of the second lens L2 is concave at the near optical axis; the object-side surface S5 of the third lens L3 is concave at the near optical axis, and the image-side surface S6 of the third lens L3 is convex at the near optical axis; the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, The image-side surface S8 of the fourth lens L4 is convex at the near optical axis; the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S10 of the fifth lens L5 is concave at the near optical axis; the object-side surface S11 of the sixth lens L6 is concave at the near optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the near optical axis; the object-side surface S13 of the seventh lens L7 is concave at the near optical axis, and the image-side surface S14 of the seventh lens L7 is concave at the near optical axis.

In the fifth embodiment, the effective focal length f of the optical lens 100 is 2.86 mm, half of the maximum field of view HFOV of the optical lens 100 is 60.10°, the total optical length TTL of the optical lens 100 is 8.60 mm, and the aperture number FNO of the optical lens 100 is 2.20 as an example.

The other parameters in the fifth embodiment are given in the following Table 9, and the definitions of the parameters can be derived from the above description, and are not repeated here. It can be understood that the units of the Y radius, thickness, and effective focal length in Table 9 are all mm. And the reference wavelength of the effective focal length, refractive index, and Abbe number of each lens in Table 9 is 587.56 nm.

Table 9

In the fifth embodiment, Table 10 gives the high-order coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 10

Please refer to FIG. 10 , which shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical lens 100 of the fifth embodiment. For specific definitions, please refer to the first embodiment and will not be repeated here. As can be seen from (A) in FIG. 10 , the spherical aberration value of the optical lens 100 in the fifth embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in FIG. 10 , at a wavelength of 587.56 nm, the astigmatism of the optical lens 100 is well compensated. As can be seen from (C) in FIG. 10 , at a wavelength of 587.56 nm, the distortion of the optical lens 100 is well corrected.

Please refer to Table 11, which is a summary of the ratios of various relationship equations in the first to fifth embodiments of the present application.

Table 11

Please refer to FIG. 11 , the present invention further discloses a camera module, the camera module 200 includes a photosensitive chip 201 and an optical lens 100 as in any one of the above-mentioned embodiments 1 to 5, the photosensitive chip 201 is arranged on the image side of the optical lens 100, at this time, the photosensitive surface of the photosensitive chip can be regarded as the imaging surface IMG of the optical lens 100. Specifically, the photosensitive chip can be a charge coupled device (CCD) or a complementary metal oxide semiconductor device (CMOS Sensor). The above-mentioned optical lens 100 is used in the camera module, which can realize a thin and small design while realizing a large viewing angle design of the optical lens.

Please refer to FIG. 12 . The present invention further discloses an electronic device, wherein the electronic device 300 includes a housing 301 and the camera module 200 described in the aforementioned embodiment, and the camera module 200 is disposed in the housing 301. Specifically, the electronic device 300 may be, but is not limited to, a portable phone, a video phone, a smart phone, an e-book reader, a driving recorder or other vehicle-mounted camera device or a wearable device such as a smart watch. When the electronic device 300 is a smart phone, the housing 301 may be the middle frame of the electronic device. The use of the above-mentioned camera module in the electronic device can realize a thin and small design while realizing a large viewing angle design of the optical lens.

The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims (8)

1. An optical lens is characterized in that seven lenses with refractive power are shared, and a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens are arranged in sequence from an object side to an image side along an optical axis;

the first lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the second lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the third lens element with refractive power;

the fourth lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

the sixth lens element with positive refractive power; the object side surface of the sixth lens element is concave at a paraxial region, and the image side surface of the sixth lens element is convex at a paraxial region;

The seventh lens element with negative refractive power has a concave image-side surface at a paraxial region;

the optical lens satisfies the following relation:

4.4mm < TTL/TAN (HFOV) <5.7mm,3.8< TTL/Sigma DT <4.4, and 1< SD72/SD11<1.4;

wherein TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical lens element on the optical axis, HFOV is half of the maximum field angle of the optical lens element, Σdt is the sum of the air spaces between each two adjacent lens elements of the first lens element and the seventh lens element on the optical axis, SD11 is half of the maximum effective aperture of the object side surface of the first lens element, and SD72 is half of the maximum effective aperture of the image side surface of the seventh lens element.

2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

3.5<|f1/f+f7/f|<4.3；

wherein f1 is an effective focal length of the first lens, f7 is an effective focal length of the seventh lens, and f is an effective focal length of the optical lens.

3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.5<(SAG41+SAG42)/(SAG42-SAG41)<0.8；

wherein SAG41 is the sagittal height of the object side surface of the fourth lens element at the maximum effective half-caliber, and SAG42 is the sagittal height of the image side surface of the fourth lens element at the maximum effective half-caliber.

4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

0.6<CT3/ET3<1.6；

wherein CT3 is the thickness of the third lens element on the optical axis, ET3 is the distance from the maximum effective half-caliber of the object-side surface of the third lens element to the maximum effective half-caliber of the image-side surface of the third lens element in the direction of the optical axis.

5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

3.5<FNO*IMGH/f<4.4；

wherein FNO is the f-number of the optical lens, IMGH is half of the image height corresponding to the maximum field angle of the optical lens, and f is the effective focal length of the optical lens.

6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship:

-1.4< R51/R52< -1, and/or-2.5 < f5/f4< -2.1;

wherein R51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, R52 is a radius of curvature of the image side surface of the fifth lens element at the optical axis, f5 is an effective focal length of the fifth lens element, and f4 is an effective focal length of the fourth lens element.

7. An imaging module, wherein the imaging module comprises a photosensitive chip and the optical lens according to any one of claims 1 to 6, and the photosensitive chip is disposed on an image side of the optical lens.

8. An electronic device, comprising a housing and the camera module of claim 7, wherein the camera module is disposed on the housing.