CN111812804A - Optical system, imaging module and electronic equipment - Google Patents

Abstract

The invention relates to an optical system, an image capturing module and an electronic device. The optical system includes in order from an object side to an image side: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with refractive power having a convex object-side surface at paraxial region; a fourth lens element with refractive power having a convex image-side surface at paraxial region; a fifth lens element with negative refractive power; a sixth lens element with positive refractive power having a convex object-side surface at paraxial region; a seventh lens element with negative refractive power having a concave image-side surface at the paraxial region; the optical system satisfies the following conditional expression: TTL/(ImgH 2) is more than or equal to 0.6 and less than or equal to 0.8. When the above conditional expressions are satisfied, the total length of the optical system can be shortened to satisfy the requirement of the miniaturization design.

Description

Optical system, imaging module and electronic equipment

technical field

The invention relates to the field of imaging, in particular to an optical system, an imaging module and an electronic device.

Background technique

With the rapid development of electronic devices such as smart phones and tablet computers, people have higher and higher requirements for electronic devices. Not only are electronic devices required to be equipped with optical systems to have camera functions, but also electronic devices are expected to be miniaturized and designed to have Small size, easy to carry and use. However, the size of the current optical system is usually large, and it is difficult to meet the requirements of miniaturization design of electronic equipment when used in electronic equipment.

SUMMARY OF THE INVENTION

Based on this, it is necessary to provide an optical system, an imaging module and an electronic device in order to solve the problem that the current optical system cannot meet the requirements of miniaturized design of electronic equipment.

An optical system, comprising in order from the object side to the image side:

The first lens with positive refractive power, the object side of the first lens is convex at the paraxial position, and the image side is concave at the paraxial position;

The second lens with negative refractive power, the object side of the second lens is convex at the paraxial position, and the image side is concave at the paraxial position;

a third lens with refractive power, the object side of the third lens is convex at the paraxial position;

a fourth lens with refractive power, the image side surface of the fourth lens is convex at the paraxial position;

a fifth lens with negative refractive power;

a sixth lens with positive refractive power, the object side of the sixth lens is convex at the paraxial position;

a seventh lens with negative refractive power, the image side surface of the seventh lens is concave at the paraxial position;

And the optical system satisfies the following conditional formula:

0.6≤TTL/(ImgH*2)≤0.8;

Among them, TTL is the total system length of the optical system, that is, the distance from the object side of the first lens to the imaging surface of the optical system on the optical axis, and ImgH is the effective pixel area of the optical system on the imaging surface. half the length of the corner.

In the above optical system, the first lens has a positive refractive power, which helps to shorten the overall system length of the optical system, and the object side of the first lens is convex at the paraxial position, which can further strengthen the first lens The size of the optical system in the direction of the optical axis becomes shorter, which is beneficial to the miniaturization design of the optical system. When the above conditional expressions are satisfied, the overall system length of the optical system and the diagonal length of the effective pixel area on the imaging plane can be reasonably configured, which is beneficial to shorten the overall system length of the optical system, thereby meeting the requirements of miniaturized design.

In one of the embodiments, the optical system satisfies the following conditional formula:

38°≤FOV/2≤46°;

Wherein, FOV is the maximum angle of view of the optical system in the diagonal direction of the effective pixel area on the imaging plane. When the above relational expression is satisfied, the optical system has the characteristics of a large viewing angle and can meet the requirements of shooting with a large viewing angle.

In one embodiment, the object side surface and the image side surface of each lens in the optical system are aspherical, and the optical system satisfies the following conditional formula:

1.0≤TTL/f≤1.5;

Wherein, TTL is the total system length of the optical system, and f is the effective focal length of the optical system. When the above relational expressions are satisfied, the overall system length and effective focal length of the optical system can be reasonably configured, so that the structural layout of the optical system is compact and reasonable, and further meets the requirements of miniaturized design. The setting of the aspherical surface is also conducive to balancing aberrations such as chromatic aberration, spherical aberration, distortion, etc. of the optical system under the condition of meeting the requirements for shooting with a large viewing angle, thereby improving the imaging quality of the optical system.

In one of the embodiments, the optical system satisfies the following conditional formula:

0.75≤DL/TTL≤1.1;

Wherein, DL is the distance from the object side of the first lens to the image side of the seventh lens on the optical axis, and TTL is the total system length of the optical system, that is, the distance from the object side of the first lens to the The distance of the imaging plane of the optical system on the optical axis. When the above relational expression is satisfied, the structure of the optical system can be reasonably arranged, and the distance between the image side surface of the seventh lens and the imaging surface of the optical system on the optical axis can be increased while meeting the miniaturization design requirements. distance, which is beneficial to the layout of the structural end of the module.

In one of the embodiments, the optical system satisfies the following conditional formula:

f23 < 0;

Wherein, f23 is the combined focal length of the second lens and the third lens. When the above relationship is satisfied, the combined focal length of the second lens and the third lens can be reasonably configured, and the positive refractive power of the first lens can be matched to effectively balance the image generated by the optical system. At the same time, the light of the fringe field of view of the optical system can be better converged on the imaging surface. In addition, the structural layout of the optical system can also be made more compact, which is beneficial to shorten the overall system length of the optical system and realize miniaturized design.

In one of the embodiments, the optical system satisfies the following conditional formula:

0≤R14/f≤1;

Wherein, R14 is the curvature radius of the image side surface of the seventh lens at the optical axis, and f is the effective focal length of the optical system. When the above relational expression is satisfied, the curvature radius of the image side surface of the seventh lens at the optical axis and the effective focal length of the optical system can be reasonably configured, so that the surface shape of the image side surface of the seventh lens is gentler, It is beneficial to suppress the generation of field curvature and distortion of the optical system, improve the imaging quality of the optical system, and at the same time reduce the difficulty of forming the seventh lens. In addition, it is also advantageous to control the total system length of the optical system, so that the total system length of the optical system is not too long.

In one of the embodiments, the optical system satisfies the following conditional formula:

|f6|+|f7|≤12mm;

Wherein, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens. When the above relationship is satisfied, the effective focal lengths of the sixth lens and the seventh lens can be reasonably configured to better balance the spherical aberration generated by each lens on the object side of the sixth lens, and at the same time, it can better The aberration of the edge field of view of the optical system is corrected, thereby improving the imaging quality of the optical system. In addition, it is also beneficial to shorten the overall system length of the optical system and realize a miniaturized design.

In one of the embodiments, the optical system satisfies the following conditional formula:

|V2-V1|≥30;

Wherein, V2 is the Abbe number of the second lens under the d line, and V1 is the Abbe number of the first lens under the d line. When the above relationship is satisfied, the Abbe numbers of the first lens and the second lens under the d-line can be reasonably configured, which is beneficial to correct the chromatic aberration of the optical system, thereby improving the imaging quality of the optical system .

In one of the embodiments, the optical system satisfies the following conditional formula:

(n1+n2)/f≤1mm ^-1 ;

Wherein, n1 is the refractive index of the first lens, n2 is the refractive index of the second lens, and f is the effective focal length of the optical system. When the above relationship is satisfied, the refractive power of the first lens and the second lens and the effective focal length of the optical system can be reasonably configured to better correct the aberration of the optical system and improve the The imaging quality of the optical system is also beneficial to shorten the overall system length of the optical system to achieve miniaturized design.

In one of the embodiments, the optical system satisfies the following conditional formula:

|R11/R14|≤3.0;

Wherein, R11 is the radius of curvature of the object side of the sixth lens at the optical axis, and R14 is the radius of curvature of the image side of the seventh lens at the optical axis. The positive refractive power of the sixth lens will increase the spherical aberration of the optical system, and when the above relationship is satisfied, the object side of the sixth lens and the image side of the seventh lens can be reasonably arranged, so as to be more efficient. The spherical aberration generated by the sixth lens is well corrected, and at the same time, the light can be better converged on the imaging surface of the optical system, thereby improving the imaging quality of the optical system.

An imaging module includes a photosensitive element and the optical system according to any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the optical system. The above-mentioned optical system is adopted in the image capturing module, and the image capturing module can be miniaturized by shortening the total system length of the optical system.

An electronic device includes a casing and the above-mentioned imaging module, wherein the imaging module is arranged on the casing. By adopting the above-mentioned imaging module in the electronic device, by shortening the total length of the optical system, the electronic device can be miniaturized.

Description of drawings

1 is a schematic diagram of an optical system in a first embodiment of the application;

2 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the first embodiment of the application;

3 is a schematic diagram of an optical system in a second embodiment of the present application;

4 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the second embodiment of the application;

5 is a schematic diagram of an optical system in a third embodiment of the present application;

6 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the third embodiment of the present application;

7 is a schematic diagram of an optical system in a fourth embodiment of the present application;

8 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fourth embodiment of the present application;

9 is a schematic diagram of an optical system in a fifth embodiment of the present application;

10 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the fifth embodiment of the application;

11 is a schematic diagram of an optical system in a sixth embodiment of the application;

12 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical system in the sixth embodiment of the application;

13 is a schematic diagram of an imaging module in an embodiment of the application;

FIG. 14 is a schematic diagram of an electronic device in an embodiment of the present application.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", " Back, Left, Right, Vertical, Horizontal, Top, Bottom, Inner, Outer, Clockwise, Counterclockwise, Axial , "radial", "circumferential" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying the indicated device or Elements must have a particular orientation, be constructed and operate in a particular orientation and are therefore not to be construed as limitations of the invention.

In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature delimited with "first", "second" may expressly or implicitly include at least one of that feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise expressly and specifically defined.

In the present invention, unless otherwise expressly specified and limited, the terms "installed", "connected", "connected", "fixed" and other terms should be understood in a broad sense, for example, it may be a fixed connection or a detachable connection , or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between the two elements, unless otherwise specified limit. 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 situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may be in direct contact between the first and second features, or the first and second features indirectly through an intermediary touch. Also, the first feature being "above", "over" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or an intervening element may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for the purpose of illustration only and do not represent the only embodiment.

1, in some embodiments of the present application, the optical system 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, The sixth lens L6 and the seventh lens L7. Specifically, the first lens L1 includes an object side S1 and an image side S2, the second lens L2 includes an object side S3 and an image side S4, the third lens L3 includes an object side S5 and an image side S6, and the fourth lens L4 includes an object side S7 And the image side S8, the fifth lens L5 includes the object side S9 and the image side S10, the sixth lens L6 includes the object side S11 and the image side S12, and the seventh lens L7 includes the object side S13 and the image side S14.

Wherein, the first lens L1 has a positive refractive power, which helps to shorten the total system length of the optical system 100, and the object side S1 of the first lens L1 is convex at the paraxial position, which can further strengthen the positive refractive power of the first lens L1, The size of the optical system 100 in the optical axis direction becomes shorter, which is beneficial to the miniaturized design of the optical system 100 . The second lens L2 has a negative refractive power, and the object side S3 of the second lens L2 is convex at the paraxial position, and the image side surface S4 is concave at the paraxial position. The third lens L3 and the fourth lens L4 have refractive power, the object side S5 of the third lens L3 is convex at the paraxial position, and the image side S8 of the fourth lens L4 is convex at the paraxial position. The fifth lens L5 has negative refractive power. The sixth lens L6 has a positive refractive power, and the object side surface S11 of the sixth lens L6 is convex at the paraxial position. The seventh lens L7 has negative refractive power, and the image side surface S14 of the seventh lens L7 is concave at the paraxial position.

In addition, in some embodiments, the optical system 100 is provided with a stop STO, and the stop STO may be arranged on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L8 disposed on the image side of the seventh lens L7, and the infrared filter L8 includes an object side S15 and an image side S16. Further, the optical system 100 further includes an image surface S17 located on the image side of the seventh lens L7, the image surface S17 is the imaging surface of the optical system 100, and the incident light passes through 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 form an image on the image plane S17 after adjustment. It is worth noting that the infrared filter L8 may be an infrared cut filter, which is used to filter out interference light and prevent the interference light from reaching the image plane S17 of the optical system 100 to affect normal imaging.

In some embodiments, the object side and the image side of each lens of the optical system 100 are aspherical. The adoption of the aspherical structure can improve the flexibility of lens design, effectively correct spherical aberration, and improve image quality. In other embodiments, the object side surface and the image side surface of each lens of the optical system 100 may also be spherical surfaces. It should be noted that the above embodiments are only examples of some embodiments of the present application. In some embodiments, the surfaces of the lenses in the optical system 100 may be aspherical or any combination of spherical surfaces. Further, in some embodiments, the object side and the image side of at least one lens in the optical system 100 are aspherical.

In some embodiments, the material of each lens in the optical system 100 may be glass or plastic. Using a lens made of plastic material can reduce the weight of the optical system 100 and reduce the production cost, and in combination with the smaller size of the optical system, a light and miniaturized design of the optical system can be realized. The lens made of glass enables the optical system 100 to have excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 can also be any combination of glass and plastic, and not necessarily all of glass or all of plastic. Further, in some embodiments, among the lenses of the optical system 100 , at least two lenses are made of plastic materials with different optical properties, so as to better correct the chromatic aberration of the optical system 100 .

It should be noted that the first lens L1 does not mean that there is only one lens. In some embodiments, there may also be two or more lenses in the first lens L1, and 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 S1, and the surface closest to the image side can be regarded as the image side S2. Alternatively, a cemented lens is not formed between the lenses in the first lens L1, but the distance between the lenses is relatively fixed. In this case, the object side of the lens closest to the object side is the object side S1, and the lens closest to the image side The image side is the image side S2. In addition, 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 in some embodiments may also be greater than or equal to two, and any A cemented lens or a non-cemented lens may be formed between adjacent lenses.

Further, in some embodiments, the optical system 100 satisfies the conditional formula: 0.6≤TTL/(ImgH*2)≤0.8; wherein, TTL is the total system length of the optical system 100, that is, the object side S1 of the first lens L1 to the optical The distance of the imaging plane of the system 100 on the optical axis, ImgH is half of the diagonal length of the effective pixel area of the optical system 100 on the imaging plane. Specifically, TTL/(ImgH*2) may be: 0.625, 0.631, 0.645, 0.658, 0.669, 0.672, 0.675, 0.684, 0.696 or 0.722. When the above conditional expressions are satisfied, the overall system length of the optical system 100 and the diagonal length of the effective pixel area on the imaging plane can be reasonably configured, which is beneficial to shorten the overall system length of the optical system 100 and meet the requirements of miniaturized design.

In some embodiments, the optical system 100 satisfies the conditional formula: 38°≤FOV/2≤46°; wherein, HFOV is the maximum field angle of the optical system 100 in the diagonal direction of the effective pixel area on the imaging plane. Specifically, FOV/2 may be: 39.5, 40.0, 40.2, 40.5, 41.3, 41.8, 42.5, 42.9, 43.7 or 44.5. When the above-mentioned relational expressions are satisfied, the optical system 100 has the characteristics of a large viewing angle, and can meet the requirements for shooting with a large viewing angle.

In some embodiments, the optical system 100 satisfies the conditional formula: 0.75≤DL/TTL≤1.1; wherein, DL is the distance on the optical axis from the object side S1 of the first lens L1 to the image side S14 of the seventh lens L7, TTL is the total system length of the optical system 100 . Specifically, the DL/TTL may be: 0.821, 0.835, 0.856, 0.867, 0.872, 0.893, 0.912, 0.925, 0.947 or 0.978. When the above relationship is satisfied, the structure of the optical system 100 can be reasonably arranged, and the distance on the optical axis from the image side S14 of the seventh lens L7 to the imaging surface of the optical system 100 on the optical axis can be increased while satisfying the miniaturization design requirements. This further facilitates the layout of the structural end of the module.

In some embodiments, the object side and the image side of each lens in the optical system 100 are aspherical, and the optical system 100 satisfies the conditional formula: 1.0≤TTL/f≤1.5; wherein, TTL is the total system length of the optical system 100, f is the effective focal length of the optical system 100 . Specifically, the TTL/f may be: 1.160, 1.183, 1.199, 1.205, 1.263, 1.275, 1.292, 1.304, 1.325 or 1.348. When the above relationship is satisfied, the total system length and effective focal length of the optical system 100 can be reasonably configured, so that the structure and layout of the optical system 100 are compact and reasonable, and further meet the requirements of miniaturized design. The setting of the aspheric surface is also conducive to balancing aberrations such as chromatic aberration, spherical aberration, and distortion of the optical system 100 under the condition of meeting the requirements for shooting with a large viewing angle, thereby improving the imaging quality of the optical system 100 .

In some embodiments, the optical system 100 satisfies the conditional formula: f23<0; wherein, f23 is the combined focal length of the second lens L2 and the third lens L3. Specifically, f23 can be: -82.626, -79.325, -65, 257, -60.324, -52.396, -43.159, -40.024, -30.632, -16.745, or -8.156. When the above relationship is satisfied, the combined focal length of the second lens L2 and the third lens L3 can be reasonably configured, and the positive refractive power of the first lens L1 can be matched to effectively balance the aberration generated by the optical system 100, and at the same time make the The light of the fringe field of view of the optical system 100 can be better converged on the imaging surface. In addition, the structural layout of the optical system 100 can also be made more compact, which is beneficial to shorten the overall system length of the optical system 100 and realize a miniaturized design.

In some embodiments, the optical system 100 satisfies the conditional formula: 0≤R14/f≤1; wherein, R14 is the curvature radius of the image side S14 of the seventh lens L7 at the optical axis, and f is the effective focal length of the optical system 100 . Specifically, R14/f may be: 0.381, 0.398, 0.402, 0.439, 0.487, 0.524, 0.671, 0.853, 0.903 or 0.944. When the above relationship is satisfied, the curvature radius of the image side S14 of the seventh lens L7 at the optical axis and the effective focal length of the optical system 100 can be reasonably configured, so that the surface shape of the image side S14 of the seventh lens L7 is smoother, and there are This is beneficial to suppress the field curvature and distortion of the optical system 100 , improve the imaging quality of the optical system 100 , and also reduce the difficulty of forming the seventh lens L7 . In addition, it is also advantageous to control the total system length of the optical system 100 so that the total system length of the optical system 100 is not too long.

In some embodiments, the optical system 100 satisfies the conditional formula: |f6|+|f7|≤12mm; wherein, f6 is the effective focal length of the sixth lens L6, and f7 is the effective focal length of the seventh lens L7. Specifically, |f6|+|f7| may be: 9.413, 9.546, 9.638, 9.763, 9.925, 10.058, 10.237, 10.564, 10.794 or 10.873. When the above relationship is satisfied, the effective focal lengths of the sixth lens L6 and the seventh lens L7 can be reasonably configured to better balance the spherical aberration generated by each lens on the object side of the sixth lens L6, and at the same time, the optical system can be better corrected 100 aberrations at the edge of the field of view, thereby improving the imaging quality of the optical system 100 . In addition, it is also advantageous to shorten the overall system length of the optical system 100 and realize a miniaturized design.

In some embodiments, the optical system 100 satisfies the conditional formula: |V2-V1|≥30; wherein, V2 is the Abbe number of the second lens L2 at the d-line (587.56 nm), and V1 is the first lens L1 at d Abbe number offline. Specifically, |V2-V1| may be: 35.71, 35.85, 35.94, 36.01, 36.13, 36.24, 36.38, 36.45, 36.52 or 36.71. When the above relationship is satisfied, the Abbe numbers of the first lens L1 and the second lens L2 under the d-line can be reasonably configured, which is beneficial to correct the chromatic aberration of the optical system 100 and further improve the imaging quality of the optical system 100 .

In some embodiments, the optical system 100 satisfies the conditional formula: (n1+n2)/f≤1mm ⁻¹ ; wherein, n1 is the refractive index of the first lens L1, n2 is the refractive index of the second lens L2, and f is the optical The effective focal length of the system 100. Specifically, (n1+n2)/f can be: 0.579, 0.583, 0.594, 0.612, 0.628, 0.637, 0.645, 0.652, 0.663 or 0.689, and the numerical unit is mm ⁻¹ . When the above relationship is satisfied, the refractive power of the first lens L1 and the second lens L2 and the effective focal length of the optical system 100 can be reasonably configured to better correct the aberration of the optical system 100 and improve the imaging quality of the optical system 100 , and at the same time, it is also beneficial to shorten the total system length of the optical system 100 to realize miniaturized design.

In some embodiments, the optical system 100 satisfies the conditional formula: |R11/R14|≤3.0; wherein, R11 is the radius of curvature of the object side S11 of the sixth lens L6 at the optical axis, and R14 is the image side of the seventh lens L7 The radius of curvature of S14 at the optical axis. Specifically, |R11/R14| may be: 0.390, 0.528, 0.739, 0.927, 1.374, 1.785, 1.903, 2.055, 2.281 or 2.349. The positive refractive power of the sixth lens L6 will increase the spherical aberration of the optical system 100. When the above relationship is satisfied, the object side S11 of the sixth lens L6 and the image side S14 of the seventh lens L7 can be reasonably configured to better The aberration generated by the sixth lens L6 is corrected, and at the same time, the light can be better converged on the imaging surface of the optical system 100 , thereby improving the imaging quality of the optical system 100 .

Based on the descriptions of the above embodiments, more specific embodiments and accompanying drawings are provided below for detailed description.

first embodiment

Please refer to FIG. 1 and FIG. 2. FIG. 1 is a schematic diagram of the optical system 100 in the first embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a negative The second lens L2 having a refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. 2 shows graphs of spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment from left to right, wherein the reference wavelength of the astigmatism graph and the distortion graph is 555 nm, and the other embodiments are the same.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S7 of the fourth lens L4 is concave at the paraxial position, and is concave at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object and image sides 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 are aspherical surfaces.

It should be noted that, in this application, when a surface of the lens is described as convex at the paraxial position (the central area of the side surface), it can be understood that the area of the surface of the lens near the optical axis is convex. When it is described that one surface of the lens is concave at the circumference, it can be understood that the area of the surface near the maximum effective radius is concave. For example, when the surface is convex at the optical axis and also convex at the circumference, the shape of the surface from the center (optical axis) to the edge direction can be purely convex; or a convex shape from the center first Transitions to a concave shape, then becomes convex near the maximum effective radius. This is only an example to illustrate the relationship between the optical axis and the circumference. The various shapes and structures of the surface (concave-convex relationship) are not fully reflected, but other situations can be derived from the above examples.

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 are all plastics.

Further, the optical system 100 satisfies the conditional formula: TTL/(ImgH*2)=0.636; wherein, TTL is the total system length of the optical system 100, and ImgH is half of the diagonal length of the effective pixel area of the optical system 100 on the imaging plane. When the above conditional expressions are satisfied, the overall system length of the optical system 100 and the diagonal length of the effective pixel area on the imaging plane can be reasonably configured, which is beneficial to shorten the overall system length of the optical system 100 and meet the requirements of miniaturized design.

The optical system 100 satisfies the conditional formula: FOV/2=42.5°; wherein, FOV is the maximum field angle of the optical system 100 in the diagonal direction of the effective pixel area on the imaging plane. When the above-mentioned relational expressions are satisfied, the optical system 100 has the characteristics of a large viewing angle, and can meet the requirements for shooting with a large viewing angle.

The optical system 100 satisfies the conditional formula: DL/TTL=0.829; wherein, DL is the distance on the optical axis from the object side S1 of the first lens L1 to the image side S14 of the seventh lens L7, and TTL is the total system length of the optical system 100. When the above relationship is satisfied, the structure of the optical system 100 can be reasonably arranged, and the distance on the optical axis from the image side S14 of the seventh lens L7 to the imaging surface of the optical system 100 on the optical axis can be increased while satisfying the miniaturization design requirements. This further facilitates the layout of the structural end of the module.

The object side and the image side of each lens in the optical system 100 are aspheric surfaces, and the optical system 100 satisfies the conditional formula: TTL/f=1.180; wherein, TTL is the total system length of the optical system 100, and f is the effective focal length of the optical system 100 . When the above relationship is satisfied, the total system length and effective focal length of the optical system 100 can be reasonably configured, so that the structure and layout of the optical system 100 are compact and reasonable, and further meet the requirements of miniaturized design. The setting of the aspheric surface is also conducive to balancing aberrations such as chromatic aberration, spherical aberration, and distortion of the optical system 100 under the condition of meeting the requirements for shooting with a large viewing angle, thereby improving the imaging quality of the optical system 100 .

The optical system 100 satisfies the conditional formula: f23=-82.616; wherein, f23 is the combined focal length of the second lens L2 and the third lens L3. When the above relationship is satisfied, the combined focal length of the second lens L2 and the third lens L3 can be reasonably configured, and the positive refractive power of the first lens L1 can be matched to effectively balance the aberration generated by the optical system 100, and at the same time make the The light of the fringe field of view of the optical system 100 can be better converged on the imaging surface. In addition, the structural layout of the optical system 100 can also be made more compact, which is beneficial to shorten the overall system length of the optical system 100 and realize a miniaturized design.

The optical system 100 satisfies the conditional formula: R14/f=0.389; wherein, R14 is the curvature radius of the image side surface S14 of the seventh lens L7 at the optical axis, and f is the effective focal length of the optical system 100 . When the above relationship is satisfied, the curvature radius of the image side S14 of the seventh lens L7 at the optical axis and the effective focal length of the optical system 100 can be reasonably configured, so that the surface shape of the image side S14 of the seventh lens L7 is smoother, and there are This is beneficial to suppress the field curvature and distortion of the optical system 100 , improve the imaging quality of the optical system 100 , and also reduce the difficulty of forming the seventh lens L7 . In addition, it is also advantageous to control the total system length of the optical system 100 so that the total system length of the optical system 100 is not too long.

The optical system 100 satisfies the conditional formula: |f6|+|f7|=9.742 mm; wherein, f6 is the effective focal length of the sixth lens L6, and f7 is the effective focal length of the seventh lens L7. When the above relationship is satisfied, the effective focal lengths of the sixth lens L6 and the seventh lens L7 can be reasonably configured to better balance the spherical aberration generated by each lens on the object side of the sixth lens L6, and at the same time, the optical system can be better corrected 100 aberrations at the edge of the field of view, thereby improving the imaging quality of the optical system 100 . In addition, it is also advantageous to shorten the overall system length of the optical system 100 and realize a miniaturized design.

The optical system 100 satisfies the conditional formula: |V2-V1|=36.710; wherein, V2 is the Abbe number of the second lens L2 under the d line, and V1 is the Abbe number of the first lens L1 under the d line. When the above relationship is satisfied, the Abbe numbers of the first lens L1 and the second lens L2 under the d-line can be reasonably configured, which is beneficial to correct the chromatic aberration of the optical system 100 and further improve the imaging quality of the optical system 100 .

The optical system 100 satisfies the conditional formula: (n1+n2)/f=0.643mm ⁻¹ ; wherein, n1 is the refractive index of the first lens L1, n2 is the refractive index of the second lens L2, and f is the effective focal length of the optical system 100 . When the above relationship is satisfied, the refractive power of the first lens L1 and the second lens L2 and the effective focal length of the optical system 100 can be reasonably configured to better correct the aberration of the optical system 100 and improve the imaging quality of the optical system 100 , and at the same time, it is also beneficial to shorten the total system length of the optical system 100 to realize miniaturized design.

The optical system 100 satisfies the conditional formula: |R11/R14|=2.306; wherein, R11 is the radius of curvature of the object side S11 of the sixth lens L6 at the optical axis, and R14 is the image side S14 of the seventh lens L7 at the optical axis. Radius of curvature. The positive refractive power of the sixth lens L6 will increase the spherical aberration of the optical system 100. When the above relationship is satisfied, the object side S11 of the sixth lens L6 and the image side S14 of the seventh lens L7 can be reasonably configured to better The spherical aberration generated by the sixth lens L6 is corrected, and at the same time, the light can be better converged on the imaging surface of the optical system 100 , thereby improving the imaging quality of the optical system 100 .

In addition, various parameters of the optical system 100 are given in Table 1. The image plane S17 in Table 1 can be understood as the imaging plane of the optical system 100 . The elements from the object plane (not shown) to the image plane S17 are sequentially arranged in the order of the elements in Table 1 from top to bottom. The Y radius in Table 1 is the curvature radius of the object side or image side of the corresponding surface number at the optical axis. Surface number 1 and surface number 2 are the object side S1 and the image side S2 of the first lens L1 respectively, that is, in the same lens, the surface with the smaller surface number is the object side, and the surface with the larger surface number is the image side. The first value in the "thickness" parameter column of the first lens L1 is the thickness of the lens on the optical axis, and the second value is the object side of the next lens from the image side to the image side of the lens on the optical axis. on the distance.

It should be noted that, in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L8, but at this time, the distance from the image surface S14 to the image surface S17 of the seventh lens L7 remains unchanged.

In the first embodiment, the effective focal length of the optical system 100 is f=5.0mm, the aperture number FNO=1.9, the maximum field of view FOV=85°, and the total system length TTL=5.9mm; the system is diagonal to the effective pixel area on the imaging plane Half of the line length ImgH=4.64mm, the maximum imaging circle diameter MIC=9.54mm of the system on the imaging plane, the distance on the optical axis from the object side S1 of the first lens L1 to the image side S14 of the seventh lens L7 on the optical axis DL=4.894 mm.

In addition, the focal length of each lens is a numerical value at wavelength=555 nm, and the refractive index and Abbe number of each lens are numerical values at a d-line (587.56 nm), and the same is true for other embodiments.

Table 1

Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 2. Among them, the surface numbers from 1-14 represent the image side or the object side S1-S14 respectively. From top to bottom, K-A20 represent the types of aspheric coefficients, where K represents the conic coefficient, A4 represents the fourth-order aspheric coefficient, A6 represents the sixth-order aspheric coefficient, and A8 represents the eight-order aspheric coefficient. analogy. In addition, the aspheric coefficient formula is as follows:

where Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the conic coefficient, and Ai is the aspheric surface The coefficient corresponding to the i-th higher-order term in the face formula.

Table 2

And, according to the parameter information provided above, the following data can be inferred:

f34 -266.146 f56 6.196 f45 -13.472 f67 -41.793

Wherein, f23 is the combined focal length of the second lens L2 and the third lens L3, f34 is the combined focal length of the third lens L3 and the fourth lens L4, f45 is the combined focal length of the fourth lens L4 and the fifth lens L5, and f56 is the combined focal length of the third lens L3 and the fourth lens L4. The combined focal length of the fifth lens L5 and the sixth lens L6, f67 is the combined focal length of the sixth lens L6 and the seventh lens L7, and other embodiments are also the same.

Second Embodiment

Please refer to FIG. 3 and FIG. 4 . FIG. 3 is a schematic diagram of the optical system 100 in the second embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a negative The second lens L2 having a refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. FIG. 4 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment from left to right.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is concave at the paraxial position, and is concave at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is concave at the paraxial position, and is concave at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object and image sides 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 are aspherical surfaces.

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 are all plastics.

In addition, the parameters of the optical system 100 are given in Table 3, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

table 3

Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 4, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 4

And, according to the parameter information provided above, the following data can be inferred:

TTL/(ImgH*2) 0.625 (n1+n2)/f 0.643 HFOV 42.35 |R11/R14| 2.170867 DL/TTL 0.82137931 f23 -26.711 TTL/f 1.16 f34 -162.033 R14/f 0.4005356 f45 -17.034 |f6|+|f7| 9.709007 f56 6.044 |V2-V1| 36.71 f67 -71.679

Third Embodiment

Please refer to FIG. 5 and FIG. 6 . FIG. 5 is a schematic diagram of the optical system 100 in the third embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a negative The second lens L2 having a refractive power, a third lens L3 having a positive refractive power, a fourth lens L4 having a negative refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. FIG. 6 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment from left to right.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S7 of the fourth lens L4 is concave at the paraxial position, and is concave at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S9 of the fifth lens L5 is a concave surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object and image sides 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 are aspherical surfaces.

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 are all plastics.

In addition, the parameters of the optical system 100 are given in Table 5, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

table 5

Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 6, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 6

And, according to the parameter information provided above, the following data can be inferred:

TTL/(ImgH*2) 0.63362069 (n1+n2)/f 0.645582 HFOV 42.5 |R11/R14| 2.348706 DL/TTL 0.977911647 f23 -57.299 TTL/f 1.180722892 f34 -75.377 R14/f 0.381280594 f45 -12.960 |f6|+|f7| 9.412561 f56 5.948 |V2-V1| 36.71 f67 -48.246

Fourth Embodiment

Please refer to FIG. 7 and FIG. 8 . FIG. 7 is a schematic diagram of the optical system 100 in the fourth embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with positive refractive power, a negative The second lens L2 having a refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. FIG. 8 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment from left to right.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is concave at the paraxial position, and is concave at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position and a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object and image sides 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 are aspherical surfaces.

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 are all plastics.

In addition, the parameters of the optical system 100 are given in Table 7, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 7

Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 8, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 8

And, according to the parameter information provided above, the following data can be inferred:

TTL/(ImgH*2) 0.721982759 (n1+n2)/f 0.579385 HFOV 39.5 |R11/R14| 0.426198 DL/TTL 0.849253731 f23 -8.259 TTL/f 1.211573237 f34 23.738 R14/f 0.836544491 f45 26.773 |f6|+|f7| 10.872545 f56 8.827 |V2-V1| 35.71 f67 170.255

Fifth Embodiment

Please refer to FIG. 9 and FIG. 10 . FIG. 9 is a schematic diagram of the optical system 100 in the fifth embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a negative A second lens L2 having a refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. FIG. 10 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment from left to right.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is concave at the paraxial position, and is concave at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position and a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object side surface and the image side surface 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 are aspherical.

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 are all plastics.

In addition, the parameters of the optical system 100 are given in Table 9, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 9

Further, the aspheric coefficients of the image side or object side of each lens of the optical system 100 are given in Table 10, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 10

And, according to the parameter information provided above, the following data can be inferred:

TTL/(ImgH*2) 0.700431034 (n1+n2)/f 0.62947 HFOV 42 |R11/R14| 0.438325 DL/TTL 0.838461538 f23 -8.156 TTL/f 1.277013752 f34 20.265 R14/f 0.831114694 f45 22.027 |f6|+|f7| 10.217879 f56 7.201 |V2-V1| 35.71 f67 30.077

Sixth Embodiment

Please refer to FIGS. 11 and 12 . FIG. 11 is a schematic diagram of the optical system 100 in the sixth embodiment. The optical system 100 sequentially includes a diaphragm STO, a first lens L1 with a positive refractive power, a negative A second lens L2 having a refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive refractive power, a fifth lens L5 having a negative refractive power, a sixth lens L6 having a positive refractive power, and a negative The seventh lens L7 of refractive power. FIG. 12 is a graph of spherical aberration, astigmatism and distortion of the optical system 100 in the sixth embodiment from left to right.

The object side surface S1 of the first lens L1 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S2 of the first lens L1 is concave at the paraxial position, and is concave at the circumference;

The object side surface S3 of the second lens L2 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S4 of the second lens L2 is concave at the paraxial position, and is concave at the circumference;

The object side surface S5 of the third lens L3 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S6 of the third lens L3 is concave at the paraxial position and convex at the circumference;

The object side surface S7 of the fourth lens L4 is a convex surface at the paraxial position, and is a convex surface at the circumference;

The image side surface S8 of the fourth lens L4 is a convex surface at the paraxial position and a concave surface at the circumference;

The object side surface S9 of the fifth lens L5 is a convex surface at the paraxial position, and is a concave surface at the circumference;

The image side surface S10 of the fifth lens L5 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S11 of the sixth lens L6 is a convex surface at the paraxial position and a concave surface at the circumference;

The image side surface S12 of the sixth lens L6 is a concave surface at the paraxial position and a convex surface at the circumference;

The object side surface S13 of the seventh lens L7 is a concave surface at the paraxial position and a convex surface at the circumference;

The image side surface S14 of the seventh lens L7 is concave at the paraxial position and convex at the circumference.

The object side surface and the image side surface 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 are aspherical.

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 are all plastics.

In addition, the parameters of the optical system 100 are given in Table 11, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 11

Further, the aspheric coefficients of each lens of the optical system 100 on the image side or the object side are given in Table 12, and the definitions of the parameters can be obtained from the first embodiment, which will not be repeated here.

Table 12

And, according to the parameter information provided above, the following data can be inferred:

TTL/(ImgH*2) 0.675646552 (n1+n2)/f 0.689032 HFOV 44.5 |R11/R14| 0.390214 DL/TTL 0.832535885 f23 -8.387 TTL/f 1.348387097 f34 19.828 R14/f 0.944471249 f45 20.518 |f6|+|f7| 10.058023 f56 6.310 |V2-V1| 35.71 f67 16.718

Referring to FIG. 13 , in some embodiments, the optical system 100 can be assembled with the photosensitive element 210 to form the imaging module 200 . At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the image surface S17 of the optical system 100 . The imaging module 200 may also be provided with an infrared filter L8, and the infrared filter L8 is disposed between the image side S14 and the image surface S17 of the seventh lens L7. Specifically, the photosensitive element 210 may be a charge coupled device (Charge Coupled Device, CCD) or a complementary metal-oxide semiconductor device (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The above-mentioned optical system 100 is used in the image capturing module 200 , and the image capturing module 200 can be miniaturized by shortening the total system length of the optical system 100 .

Referring to FIG. 13 and FIG. 14 , in some embodiments, the imaging module 200 can be applied to an electronic device 300 , the electronic device includes a casing 310 , and the imaging module 200 is disposed in the casing 310 . Specifically, the electronic device 300 may be, but is not limited to, a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted camera device such as a driving recorder, or a wearable device such as a smart watch. By adopting the imaging module 200 in the electronic device 300 , by shortening the total system length of the optical system 100 , the electronic device 300 can be miniaturized.

The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, all possible combinations of the technical features in the above-described embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be regarded as the scope described in this specification.

The above-mentioned embodiments only represent several embodiments of the present invention, and the descriptions thereof are more specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (12)

1. An optical system comprising, in order from an object side to an image side:

a first lens element with positive refractive power having a convex object-side surface and a concave image-side surface;

a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface;

a third lens element with refractive power having a convex object-side surface at paraxial region;

a fourth lens element with refractive power having a convex image-side surface at paraxial region;

a fifth lens element with negative refractive power;

a sixth lens element with positive refractive power having a convex object-side surface at paraxial region;

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

and the optical system satisfies the following conditional expression:

0.6≤TTL/(ImgH*2)≤0.8；

wherein, TTL is the total system length of the optical system, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical system.

2. The optical system according to claim 1, wherein the following conditional expression is satisfied:

38°≤FOV/2≤46°；

the FOV is the maximum field angle of the optical system in the diagonal direction of the effective pixel area on the imaging plane.

3. The optical system of claim 2, wherein the object-side surface and the image-side surface of each lens in the optical system are aspheric, and the optical system satisfies the following conditional expression:

1.0≤TTL/f≤1.5；

wherein, TTL is the total system length of the optical system, and f is the effective focal length of the optical system.

4. The optical system according to claim 1, wherein the following conditional expression is satisfied:

0.75≤DL/TTL≤1.1；

wherein DL is a distance on an optical axis from an object-side surface of the first lens element to an image-side surface of the seventh lens element, and TTL is a total system length of the optical system.

5. The optical system according to claim 1, wherein the following conditional expression is satisfied:

f23＜0；

wherein f23 is the combined focal length of the second lens and the third lens.

6. The optical system according to claim 1, wherein the following conditional expression is satisfied:

0≤R14/f≤1；

wherein R14 is a radius of curvature of an image-side surface of the seventh lens at an optical axis, and f is an effective focal length of the optical system.

7. The optical system according to claim 1, wherein the following conditional expression is satisfied:

|f6|+|f7|≤12mm；

wherein f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

8. The optical system according to claim 1, wherein the following conditional expression is satisfied:

|V2-V1|≥30；

wherein V2 is the Abbe number of the second lens under d-line, and V1 is the Abbe number of the first lens under d-line.

9. The optical system according to claim 1, wherein the following conditional expression is satisfied:

(n1+n2)/f≤1mm^-1；

wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, and f is an effective focal length of the optical system.

10. The optical system according to claim 1, wherein the following conditional expression is satisfied:

|R11/R14|≤3.0；

wherein R11 is a radius of curvature of an object-side surface of the sixth lens element at an optical axis, and R14 is a radius of curvature of an image-side surface of the seventh lens element at the optical axis.

11. An image capturing module, comprising a photosensitive element and the optical system of any one of claims 1 to 10, wherein the photosensitive element is disposed on an image side of the optical system.

12. An electronic device, comprising a housing and the image capturing module of claim 11, wherein the image capturing module is disposed on the housing.

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