Intra-focal lens and camera module

Abstract

The application provides an inner focusing lens and a camera module, wherein the inner focusing lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens form an upper group lens and a lower group lens; the upper group lens is located at the front end of the lower group lens in the light incident direction; the upper group lens can move along the optical axis direction relative to the lower group lens; when the object distance changes, the gap between the upper group lens and the lower group lens is changed by adjusting the position of the upper group lens, so that the corresponding image space position of the inner focusing lens is unchanged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, in particular to an inner focusing lens and a camera module. BACKGROUND

[0002] Nowadays, people's life enters the high-speed development of digital era, and the performance of mobile phones, as an essential electronic communication device in people's life, has also been unprecedentedly developed compared with the past traditional models. Especially in the field of mobile phone shooting, emerging technologies are constantly emerging, constantly improving and maturing. Among them, the most obvious is the thinning of mobile phones, which greatly optimizes the user experience, and also puts forward further requirements on the optical design of mobile phone lenses: it means shorter total length of the lens, while also needs to ensure the same demand for image quality performance.

[0003] The existing mobile phone lens focusing is to move the image plane position to achieve focusing under different object distances. This way, when the object distance is closer, the compensation of the image plane position is more rear, resulting in longer overall optical length for close distance. Obviously, this way is not conducive to the realization of mobile phone thinning. To solve this problem, the optical design of mobile phone lenses has adopted a series of height reduction schemes such as liquid lens and free-form surface, and has been successfully applied to mobile phone lenses.

[0004] Among them, although the use of liquid lens or TLENS can achieve focusing under different object distances while keeping the image plane position unchanged by changing its optical power, but because most of the current mobile phone lenses use aspheric lenses, changing the R value of the spherical surface will often introduce excessive field curvature, and because of the thickness limitation of the liquid lens or TLENS itself, it is difficult to compress the optical total length to a very ideal state in the initial state. For the height reduction scheme of free-form surface, the main purpose is to reduce the initial state of the optical total length, but still uses the existing focusing method, which is not recommended for some lenses: such as small head requirement TTL unchanged, so as to ensure that the head size does not change, it is difficult to achieve this requirement by this way; in addition, for large image surface or long focal length design, the ordinary focusing method causes the image plane to move too much distance under different object distances, and the height reduction of free-form surface cannot make up for this defect. SUMMARY

[0005] One of the main advantages of the present application is to provide an inner focusing lens and a camera module, wherein the inner focusing lens uses an inner focusing technology, that is, at least one lens of the inner focusing lens is driven by a motor, and the image plane position of the inner focusing remains unchanged, thereby completing focusing under different object distances, which is beneficial to shorten the total length of the lens.

[0006] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can effectively improve the field curvature at different object distances while keeping the image plane unchanged.

[0007] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can improve the image quality at close distance to a certain extent by moving the lens spacing while keeping the image plane position unchanged.

[0008] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can reduce the back focus by moving at least one lens (lens group) while keeping the image plane position unchanged, thereby facilitating the reduction of the total length (TTL) of the lens.

[0009] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can reduce the field curvature at close distance, thereby improving the image quality.

[0010] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can keep the image plane position unchanged by inner focusing, achieve focusing at different object distances, and effectively reduce the module height.

[0011] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can keep the image plane position unchanged by inner focusing, achieve focusing at different object distances, and effectively improve the performance of the camera module at close distance.

[0012] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens includes seven lenses with non-adhesive aspheric lenses having optical power, and at least one lens is arranged as a movable lens (group) that can move along the optical axis to provide positive optical power, thereby keeping the image space position unchanged when the object distance changes, keeping the object distance of the corresponding moving group unchanged, and fixing the image plane position.

[0013] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the inner focusing lens can achieve a larger object distance change range with a smaller stroke, fix the image plane position relative to a general lens, and greatly improve the field curvature performance of the lens relative to a TLENS lens.

[0014] Another advantage of the present application is to provide an inner focusing lens and camera module, wherein the first lens of the inner focusing lens is a positive lens and the second lens is a negative lens, which can effectively reduce the distortion of the optical system.

[0015] Another advantage of the present application is to provide an inner focusing lens and a camera module, wherein the seventh lens of the inner focusing lens is a negative lens and an M-type lens, which can effectively improve the field curvature of the optical system.

[0016] Another advantage of the present application is to provide an inner focusing lens and a camera module, wherein the inner focusing lens can effectively reduce the chromatic aberration of the camera module, thereby improving the imaging quality.

[0017] According to an aspect of the present application, an inner focusing lens of the present application capable of achieving the foregoing and other objects and advantages comprises:

[0018] a first lens;

[0019] a second lens;

[0020] a third lens;

[0021] a fourth lens;

[0022] a fifth lens;

[0023] a sixth lens; and

[0024] a seventh lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged at intervals along an optical axis direction from an object side to an image side, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens form an upper group lens and a lower group lens, wherein the upper group lens is located at the front end of the light incident direction of the lower group lens, and the upper group lens can move along the optical axis direction relative to the lower group lens, when the object distance changes, the gap between the upper group lens and the lower group lens is changed by adjusting the position of the upper group lens, so that the corresponding image space position of the inner focusing lens is unchanged.

[0025] According to at least one embodiment of the present application, the first lens, the second lens, the third lens, the fourth lens and the fifth lens form the upper group lens, and the sixth lens and the seventh lens form the lower group lens.

[0026] According to at least one embodiment of the present application, the first lens, the second lens and the third lens form the upper group lens, the fifth lens, the sixth lens and the seventh lens form the lower group lens, and the fourth lens is arranged as a middle group lens, and focusing is achieved by adjusting the position of the middle group lens.

[0027] According to at least one embodiment of the present application, the first lens has positive refractive power, and the second lens has negative refractive power.

[0028] According to at least one embodiment of the present application, the seventh lens has negative refractive power, and the seventh lens adopts the shape of a M-type lens.

[0029] According to at least one embodiment of the present application, the focal length of the inner focusing lens is f, the focal length of the movable lens (group) is f M , the focal length of the nth lens is fn, the radius of curvature of the nth lens close to the object side is R LnS1 , the radius of curvature of the nth lens close to the image side is R LnS2 , the maximum stroke of the movable lens (group) is AFD, and the following conditions are satisfied: 0.8 < f M / f < 2.9; |∑fn| / f > 1.6; 1.84 < ∑R LnS1 / R LnS2 < 8; 0.09 < AFD < 0.5, and the upper group lens (group) and / or the lower group lens (group) provides positive refractive power.

[0030] According to at least one embodiment of the present application, the thickness of the nth lens on the optical axis is CTn, the total optical length of the optical system of the inner focusing lens is TTL, the half image height of the image surface is ImageH, and focusing is achieved by moving the movable lens (group), and the following conditions are satisfied: 0.05 < CT1 / TTL < 0.15; TTL max -TTL min < 0.5; 0.6 < TTL 主物距 / (2*ImageH) < 0.8; the gap between any two adjacent lens groups is greater than 0.18.

[0031] According to at least one embodiment of the present application, the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is convex, the image side of the second lens is concave, the object side of the third lens is convex, the image side of the third lens is concave, the object side of the fourth lens is concave, the image side of the fourth lens is convex, the object side of the fifth lens is concave, the image side of the fifth lens is concave, the object side of the sixth lens is convex, the image side of the sixth lens is convex, the object side of the seventh lens is concave, and the image side of the seventh lens is concave.

[0032] According to at least one embodiment of the present application, the aspheric curve equation of each lens of the inner focusing lens is represented as follows:

[0033]

[0034] wherein: X is the relative distance of a point on the aspheric surface with a distance Y from the optical axis to the tangent plane of the aspheric surface at the intersection point of the optical axis; Y is the perpendicular distance from the point on the aspheric curve to the optical axis; R is the radius of curvature; k is the conic constant; and Ai is the aspheric coefficient of the i-th order.

[0035] According to another aspect of the present application, the present application further provides a camera module, comprising:

[0036] an inner focus lens;

[0037] a photosensitive component, wherein the inner focus lens is disposed in the photosensitive component; and

[0038] at least one inner focus motor, wherein the inner focus lens comprises:

[0039] a first lens;

[0040] a second lens;

[0041] a third lens;

[0042] a fourth lens;

[0043] a fifth lens;

[0044] a sixth lens; and

[0045] a seventh lens, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are sequentially arranged in a direction of an optical axis from an object side to an image side, and the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens form an upper group lens (set) and a lower group lens (set), wherein the upper group lens (set) is located at the front end of the lower group lens (set) in the direction of the optical axis, and the upper group lens (set) is movable relative to the lower group lens (set) in the direction of the optical axis, and when the object distance changes, the gap between the upper group lens (set) and the lower group lens (set) is changed by driving the upper group lens (set) by the inner focus motor, so that the corresponding image space position of the inner focus lens is unchanged.

[0046] According to at least one embodiment of the present application, the first lens, the second lens, the third lens and the fourth lens form the upper group lens (set), and the fifth lens, the sixth lens and the seventh lens form the lower group lens (set).

[0047] According to at least one embodiment of the present application, the first lens, the second lens and the third lens form the upper group lens (set), the fifth lens, the sixth lens and the seventh lens form the lower group lens (set), the fourth lens is arranged as a middle group lens (set), and focusing is achieved by adjusting the position of the middle group lens (set).

[0048] According to at least one embodiment of the present application, the first lens has positive refractive power, and the second lens has negative refractive power.

[0049] According to at least one embodiment of the present application, the seventh lens has negative refractive power, and the seventh lens adopts the shape of an M-shaped lens.

[0050] According to at least one embodiment of the present application, the focal length of the inner focusing lens is f, the focal length of the movable lens (set) is f M , the focal length of the nth lens is fn, the radius of curvature of the nth lens close to the object side is R LnS1 , the radius of curvature of the nth lens close to the object side is R LnS2 , the maximum stroke of the movable lens (set) is AFD, and the following conditions are met: 0.8 < f M / f < 2.9; |∑fn| / f > 1.6; 1.84 < ∑R LnS1 / R LnS2 < 8; 0.09 < AFD < 0.5, and the upper group lens (set) and / or the lower group lens (set) provides positive refractive power.

[0051] According to at least one embodiment of the present application, the thickness of the nth lens on the optical axis is CTn, the total optical length of the optical system of the inner focusing lens is TTL, the half image height of the image surface is ImageH, and focusing is achieved by moving the movable lens (set), which satisfies the following conditions: 0.05 < CT1 / TTL < 0.15; TTL max -TTL min < 0.5; 0.6 < TTL 主物距 / (2*ImageH) < 0.8; and the gap between any two adjacent lens groups is greater than 0.18.

[0052] According to at least one embodiment of the present application, the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, the object side surface of the fifth lens is concave, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex, the image side surface of the sixth lens is convex, the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave.

[0053] According to at least one embodiment of the present application, the aspheric curve equation of each lens of the inner focusing lens is represented as follows:

[0054]

[0055] wherein X is the relative distance of a point on the aspheric curve with a distance Y from the optical axis to the tangent of the intersection point of the aspheric curve and the optical axis; Y is the perpendicular distance of a point on the aspheric curve from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the aspheric coefficient of the i-th order.

[0056] Further objects and advantages of the present application can be more fully understood and appreciated by reference to the following description taken in connection with the accompanying drawings.

[0057] These and other objects, features and advantages of the present application will become apparent with reference to the following detailed description and accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0058] Figure 1 is a structural schematic diagram of an inner focusing lens according to a first preferred embodiment of the present application.

[0059] Figure 2A and Figure 2B are distortion curves corresponding to different object distances of the inner focusing lens according to the above first preferred embodiment of the present application.

[0060] Figure 3A and Figure 3B are astigmatism curves corresponding to different object distances of the inner focusing lens according to the above first preferred embodiment of the present application.

[0061] Figure 4A and Figure 4B are axial chromatic aberration curves corresponding to different object distances of the inner focusing lens according to the above first preferred embodiment of the present application.

[0062] Figure 5 is a structural schematic diagram of an inner focusing lens according to a second preferred embodiment of the present application.

[0063] Figure 6A and Figure 6B are the distortion curves of the inner focusing lens according to the second preferred embodiment of the present application at different object distances.

[0064] Figure 7A and Figure 7B are the astigmatism curves of the inner focusing lens according to the second preferred embodiment of the present application at different object distances.

[0065] Figure 8A and Figure 8B are the axial chromatic aberration curves of the inner focusing lens according to the second preferred embodiment of the present application at different object distances.

[0066] Figure 9A and Figure 9B is a structural schematic diagram of an inner focusing lens according to the third preferred embodiment of the present application.

[0067] Figure 10A and Figure 10B are the distortion curves of the inner focusing lens according to the third preferred embodiment of the present application at different object distances.

[0068] Figure 11A and Figure 11B are the astigmatism curves of the inner focusing lens according to the third preferred embodiment of the present application at different object distances.

[0069] Figure 12A and Figure 12B are the axial chromatic aberration curves of the inner focusing lens according to the third preferred embodiment of the present application at different object distances.

[0070] Figure 13A and Figure 13B is a structural schematic diagram of an inner focusing lens according to the fourth preferred embodiment of the present application.

[0071] Figure 14A and Figure 14B are the distortion curves of the inner focusing lens according to the fourth preferred embodiment of the present application at different object distances.

[0072] Figure 15A and Figure 15B are the astigmatism curves of the inner focusing lens according to the fourth preferred embodiment of the present application at different object distances.

[0073] Figure 16A and Figure 16B are the axial chromatic aberration curves of the inner focusing lens according to the fourth preferred embodiment of the present application at different object distances.

[0074] Figure 17A and Figure 17Bis a structural diagram of an inner focusing lens according to a fifth preferred embodiment of the present application.

[0075] Figure 18A and Figure 18B is a distortion curve corresponding to different object distances of the inner focusing lens according to the fifth preferred embodiment of the present application.

[0076] Figure 19A and Figure 19B is an astigmatism curve corresponding to different object distances of the inner focusing lens according to the fifth preferred embodiment of the present application.

[0077] Figure 20A and Figure 20B is an axial chromatic aberration curve corresponding to different object distances of the inner focusing lens according to the fifth preferred embodiment of the present application.

[0078] Figure 21A and Figure 21B is a structural diagram of an inner focusing lens according to a sixth preferred embodiment of the present application.

[0079] Figure 22A and Figure 22B is a distortion curve corresponding to different object distances of the inner focusing lens according to the sixth preferred embodiment of the present application.

[0080] Figure 23A and Figure 23B is an astigmatism curve corresponding to different object distances of the inner focusing lens according to the sixth preferred embodiment of the present application.

[0081] Figure 24A and Figure 24B is an axial chromatic aberration curve corresponding to different object distances of the inner focusing lens according to the sixth preferred embodiment of the present application.

[0082] Figure 25 is a schematic diagram of a camera module using the inner focusing lens according to any of the preferred embodiments of the present application. DETAILED DESCRIPTION

[0083] The following description is presented to enable any person skilled in the art to practice the application as claimed. The preferred embodiments disclosed herein are only examples of the application and alternative embodiments can be devised by persons skilled in the art without departing from the spirit and scope of the present application. The present application is defined by the appended claims.

[0084] Those skilled in the art should understand that in the disclosure of the present application, the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation of the present application.

[0085] It can be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of one element can be one, and in another embodiment, the number of the element can be multiple, and the term "one" cannot be understood as a limitation on the number.

[0086] Referring to the drawings accompanying the present application specification Figures 1 to 4B As shown in the drawings accompanying the present application specification, an inner focusing lens and a camera module according to the present application are illustrated in the following description. The inner focusing lens includes a first lens 10, a second lens 20, a third lens 30, a fourth lens 40, a fifth lens 50, a sixth lens 60 and a seventh lens 70, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40, the fifth lens 50, the sixth lens 60 and the seventh lens 70 are arranged in order from the object side to the image side along the optical axis direction. It is worth mentioning that a diaphragm 100 (not shown in the figure) is located on the light entrance side of the first lens 10, at least one filter 200 is located on the light exit side of the seventh lens 70, the imaging light is incident on the first lens 10 of the inner focusing lens through the diaphragm 100, and the light fiber emitted by the seventh lens 70 is imaged at an image plane position S0 through the filter 200, that is, a photosensitive chip is located at the image plane position S0.

[0087] It is worth mentioning that in this preferred embodiment of the present application, each lens of the inner focusing lens is a lens with optical power and non-adhesive aspherical surface, and at least one lens of the inner focusing lens is a movable lens (group).

[0088] In detail, in the preferred embodiment of the present application, at least one lens of the inner focusing lens forms an upper group lens, at least one lens forms a lower group lens, the upper group lens is movable relative to the lower group lens along the optical axis, the image plane position S0 is adjusted by adjusting the gap between the upper group lens and the lower group lens, so that the image plane position S0 is kept at the position of the photosensitive chip. In other alternative embodiments of the present application, at least one lens of the inner focusing lens forms a middle group lens, the middle group lens is located between the upper group lens and the lower group lens, and the position of the middle group lens is movable relative to the upper group lens and / or the lower group lens to achieve focusing of the camera module. In short, when the lenses of the inner focusing lens are divided into three groups, focusing of the lens is achieved by adjusting the position of the middle group lens, the upper group lens and the middle group lens are movable lens groups; when the lenses of the inner focusing lens are divided into two groups, the upper group lens is a movable lens group, the lower group lens is a lens group with fixed position, and the position of the movable lens group is moved so that the image plane position S0 is always kept at the position of the photosensitive chip.

[0089] The focal length of the inner focusing lens is f, the focal length of the movable lens group is f M , the focal length of the upper group lens is f 上 , the focal length of the lower group lens is f 下 , the focal length of the nth lens is fn, the radius of curvature of the nth lens close to the object side is R LnS1 , the radius of curvature of the nth lens close to the object side is R LnS2 , the maximum stroke of the inner focusing motor of the optical system of the inner focusing lens is AFD max , which satisfies the following conditions: 0.8 < f M / f < 2.9; |∑fn| / f > 1.6; 0.8 < ∑R LnS1 / R LnS2 < 3.2; 0.09 < AFD max < 0.5.

[0090] It is worth mentioning that the inner focus motor drives the movable lens (group) of the inner focus lens to move along the optical axis direction of the inner focus lens, so that the movable lens provides positive focal power, and the corresponding image space position of the movable lens remains unchanged when the object distance changes, thereby fixing the image plane position by adjusting the position of the movable lens (group) when the object distance changes. Those skilled in the art can understand that the inner focus lens of the present application can achieve a larger object distance change range with a smaller stroke, fix the image plane position relative to the general lens, and greatly improve the field curvature performance of the lens relative to the TLENS lens. More worth mentioning is that the inner focus lens of the present application can achieve a full field curvature of less than 8 um for an object distance of 15 cm to 1.2 m.

[0091] In the preferred embodiment of the present application, the first lens 10 of the inner focus lens has positive focal power, and the second lens 20 has negative focal power, which effectively reduces the distortion of the optical system, and because the seventh lens 70 has negative focal power and adopts the shape of an M-shaped lens, the field curvature of the optical system can be effectively improved.

[0092] Further, it is assumed that the focal length of the upper group lens (group) is f 上 , the focal length of the lower group lens (group) is f 下 , the thickness of the nth lens on the optical axis is CTn, the total optical length of the optical system of the inner focus lens is TTL, the back focus of the inner focus lens is BFL, and the chip D direction half image height is ImgeH. By moving the movable lens (group) to focus, for the changed gap position, the gap between any two lens groups is SP, which satisfies the following conditions: 0.05 < CT1 / TTL < 0.15; TTL max < TTL min <0.5; 0.6 < TTL / (2*ImgeH) < 0.8; SP ≥ 0.18; |f 上 / f 下 | <1; 0.06 < BFL / TTL < 0.15; 0.015 < AFDmax / ImageH < 0.08. It is worth mentioning that if the inner focus lens is divided into an upper group lens (group) and a lower group lens (group), SP is the air gap between the upper group lens and the lower group lens; if the inner focus lens is divided into an upper group lens (group), a middle group lens (group), and a lower group lens (group), SP is the air gap between the upper group lens and the middle group lens (group), or the air gap between the middle group lens (group) and the lower group lens.

[0093] Preferably, in the preferred embodiment of the present application, the inner focusing lens satisfies the following conditional expression: 0.06 < BFL / TTL < 0.1.

[0094] The inner focusing lens of the present application can be implemented as a small head lens, i.e., the first lens of the inner focusing lens is thicker in the middle, and the CT1 / TTL main focal length value is larger, about 0.25, and the optical total length needs to be ensured to be as small as possible and remain unchanged at different object distances. In the preferred embodiment of the present application, the inner focusing lens can effectively solve the small head lens on the basis of keeping the optical total length of the optical system unchanged, and satisfy 0.6 < TTL / (2*ImgH) < 0.8. The inner focusing lens of the present application can also be implemented as a movable lens of two groups in the upper and lower groups or a movable lens of three groups in the upper, middle and lower groups. The inner focusing lens can also be implemented as a small image plane lens or a large image plane lens.

[0095] For a large image plane optical system, the change of the ordinary lens focal length will cause a large movement of the image plane position, which will lead to an increase in the overall module height. At the same time, the near distance field curvature of the large image plane is usually poor in performance. The three-group inner focusing scheme can provide the smallest change in the total length. By moving the upper group lens and the middle group lens, the image plane remains unchanged while the TTL changes <0.085. It is worth mentioning that in addition to the three-group inner focusing scheme, the two-group inner focusing scheme can also achieve a large improvement in the field curvature at different object distances, and can be used in most application scenarios for multi- object distance optical systems.

[0096] It is worth mentioning that in the present application, the gap between the movable lens (group) of the inner focusing lens and the opposite adjacent group is >0.18mm at any effective position, which provides sufficient space for structural design.

[0097] Summary of the invention; In the present application, the lens is divided into several groups, of which the first group (the upper group lens group) corresponds to an intermediate image as the object of the second group (the middle group lens group or the lower group lens group), and so on, so as to form the final image on the final image plane. It can be seen that the position of the intermediate image of the second last group and the image quality directly determine the final image plane. When the object distance changes, the ordinary focusing method is to move the image plane to achieve focusing at a new object distance, and the gap between the lenses does not change. Since the intermediate image of the second last group is the object of the last group, its position and image quality are almost impossible to provide the best object state for the final imaging. When the object distance changes (generally at close range), the focusing position in the central field of view, and other outer fields of view mostly have a large field curvature. For a general mobile phone lens, it is hoped that focusing can be achieved from inf (infinity) to 10cm, and this focusing method seriously affects the near distance image quality.

[0098] And the lens focusing mode, through the movement of the distance between the lens to focus. When the object distance changes, the lens is split into several groups, changing the distance between the groups, such as changing the distance between the first group and the second group, thereby changing the position of the intermediate image and the image quality. When the object distance changes, the position of the intermediate image of the first group changes, resulting in a change in the object distance of the second group. The gap under different object distances is set as a variable to optimize the system, which is more conducive to finding the best relative position between the groups, so that the position of the intermediate image of the second to last group and the image quality can provide maximum service for the final image quality. Compared with the traditional focusing scheme, it is more conducive to the improvement of the field curvature.

[0099] Too many groups can effectively improve the image quality, but the complex structure poses a great challenge to the stability and reliability of the system. Here we use two or three groups of focusing mode, that is, we can greatly improve the MTF image quality at close range.

[0100] Referring to the drawings of the present application Figures 1 to 4B As shown in the drawings, the inner focusing lens according to the first preferred embodiment of the present application is illustrated in the following description. In this preferred embodiment of the present application, the first lens 10 has positive refractive power, and the object side 11 of the first lens is convex, and the image side 12 of the first lens 10 is concave; the second lens 20 has negative refractive power, and the object side 21 of the second lens is convex, and the image side 22 of the second lens 20 is concave; the third lens 30 has positive refractive power, and the object side 31 of the third lens is convex, and the image side 32 of the third lens 30 is concave; the fourth lens 40 has positive refractive power, and the object side 41 of the fourth lens is concave, and the image side 42 of the fourth lens 40 is convex; the fifth lens 50 has negative refractive power, and the object side 51 of the fifth lens is concave, and the image side 52 of the fifth lens 50 is concave; the sixth lens 60 has positive refractive power, wherein the object side 61 of the sixth lens 60 is convex, and the image side 62 of the sixth lens 60 is convex; the seventh lens 70 has negative refractive power, wherein the object side 71 of the seventh lens 70 is concave, and the image side 72 of the seventh lens 70 is concave. The lenses of the inner focusing lens meet the above condition formula, and in this preferred embodiment of the present application, it is preferred that: f M The f value is 2.278877499; the |∑fn| / f value is 1.68400519; the ∑R LnS1 / R LnS2 The value is 1.61168; the AFD max The value is 0.107; the CT1 / TTL value is 0.0979138; the TTL max -TTL minThe value of X is 0.0711; the value of TTL / (2*ImgH) is 0.658489; the value of SP is 0.18; the value of BFL / TTL is 0.112707574548256; the value of fup / fdown is -0.92312612; and the value of ImageH is 6.27.

[0101] In each of the embodiments according to the above-mentioned embodiment, the aspherical curve equation of each lens of the inner focus lens is represented as follows:

[0102]

[0103] wherein X is the relative distance of a point on the aspherical curve with a vertical distance Y from the optical axis to the tangent plane of the aspherical curve at the intersection point of the optical axis; Y is the vertical distance of a point on the aspherical curve from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient.

[0104] In the preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field of view of the optical projection lens is FOV, and the values are as follows: f = 6.58 mm; Fno = 1.8; and FOV = 85 degrees.

[0105] Table 1 shows the structural parameters of each lens of the inner focus lens of the first preferred embodiment of the present application.

[0106] Table 1

[0107]

[0108]

[0109] Table 1 shows the detailed structural data of each lens of the inner focus lens of the first preferred embodiment of the present application, wherein the units of the radius of curvature, the thickness and the focal length are mm. Table 2 shows the aspherical data of each lens of the inner focus lens of the first preferred embodiment of the present application, wherein K represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the 4th-20th order aspherical coefficients of each surface. In addition, the following tables are the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the embodiments, which are not described herein.

[0110] Table 2

[0111]

[0112]

[0113] In detail, in the preferred embodiment of the present application, the first lens 10, the second lens 20 and the third lens 30 of the inner focus lens form the upper group lens set L1, the fifth lens 50, the sixth lens 60 and the seventh lens 70 form the lower group lens set L2, and the fourth lens 40 is arranged between the upper group lens set and the lower group lens set and is driven. The fourth lens 40 of the inner focus lens is implemented as the movable lens, and the upper group lens set is implemented as the movable lens set, i.e. the fourth lens 40 can be driven by the inner focus motor to move along the optical axis direction, and the upper group lens set can also be driven along the optical axis direction. It can be understood that the fourth lens 40 can also be referred to as the middle group lens L3 of the inner focus motor. When the object distance changes, the fourth lens 40 (movable lens) is driven by the inner focus motor to move, so as to keep the image plane position formed by the inner focus lens unchanged.

[0114] In detail, in the preferred embodiment of the present application, the first lens 10, the second lens 20 and the third lens 30 of the inner focus lens form the upper group lens set L1, the fifth lens 50, the sixth lens 60 and the seventh lens 70 form the lower group lens set L2, and the fourth lens 40 is arranged between the upper group lens set and the lower group lens set and is driven. The fourth lens 40 of the inner focus lens is implemented as the movable lens, and the upper group lens set is implemented as the movable lens set, i.e. the fourth lens 40 can be driven by the inner focus motor to move along the optical axis direction, and the upper group lens set can also be driven along the optical axis direction. It can be understood that the fourth lens 40 can also be referred to as the middle group lens L3 of the inner focus motor. When the object distance changes, the fourth lens 40 (movable lens) is driven by the inner focus motor to move, so as to keep the image plane position formed by the inner focus lens unchanged.

[0115] Table 3 shows the basic parameters of the inner focus lens of the first preferred embodiment of the present application.

[0116] Table 3

[0117]

[0118]

[0119] In the preferred embodiment of the present application, the image height ImgH value of the image surface formed by the inner focus lens is 6.27, and the variable distance of the object distance is 30 cm to infinity as an example, wherein the total optical length TTL value of the optical system of the inner focus lens is 8.1 mm when the object distance is infinity, and the total optical length TTL value of the inner focus lens is 8.1711 when the object distance is 30 cm. The maximum view angle FOV value of the optical projection lens of the inner focus lens is 85.0000064280624 when the object distance is infinity, and the maximum view angle FOV value of the optical projection lens of the inner focus lens is 84.8091870819496 when the object distance is 30 cm. In the preferred embodiment of the present application, the stroke distance of the upper lens group and the fourth lens 40 (movable lens) along the optical axis direction is 35.7 um, and the stroke distance of the lower lens group and the fourth lens 40 (movable lens) along the optical axis direction is 107 um. The gap between the fourth lens 40 and the upper lens group is 0.634398185366369 mm when the object distance is infinity, and the gap between the fourth lens 40 and the lower lens group is 0.180000554563717 when the object distance is infinity. The gap between the fourth lens 40 and the upper lens group is 0.59871273237129 mm when the object distance is 30 cm, and the gap between the fourth lens 40 and the lower lens group is 0.287407938865411 when the object distance is 30 cm.

[0120] Figure 2A and 2B The inner focus lens of the first preferred embodiment of the present application is shown in the corresponding distortion curves when the object distance is infinity and 30 cm, and it can be known that the inner focus lens of the first preferred embodiment of the present application effectively improves the distortion of the lens. In particular, the distortion of the inner focus lens is less than 2.30% when the object distance is infinity. Figure 3A and Figure 3B The inner focus lens of the first preferred embodiment of the present application is shown in the corresponding distortion curves when the object distance is infinity and 30 cm, and it can be known that the inner focus lens of the first preferred embodiment of the present application effectively improves the distortion of the lens. In particular, the distortion of the inner focus lens is less than 2.30% when the object distance is infinity. Figure 4A and Figure 4B The inner focus lens of the first preferred embodiment of the present application is shown in the corresponding distortion curves when the object distance is infinity and 30 cm, and it can be known that the inner focus lens of the first preferred embodiment of the present application effectively improves the distortion of the lens. In particular, the distortion of the inner focus lens is less than 2.30% when the object distance is infinity.

[0121] Referring to the drawings of the present application Figures 5 to 8BAs shown, an inner focus lens according to a second preferred embodiment of the present application is illustrated in the following description. In this preferred embodiment of the present application, the first lens 10 has positive refractive power, and the object side surface 11 of the first lens 10 is convex, and the image side surface 12 of the first lens 10 is concave; the second lens 20 has negative refractive power, and the object side surface 21 of the second lens 20 is convex, and the image side surface 22 of the second lens 20 is concave; the third lens 30 has positive refractive power, and the object side surface 31 of the third lens 30 is convex, and the image side surface 32 of the third lens 30 is concave; the fourth lens 40 has positive refractive power, and the object side surface 41 of the fourth lens 40 is concave, and the image side surface 42 of the fourth lens 40 is convex; the fifth lens 50 has negative refractive power, and the object side surface 51 of the fifth lens 50 is concave, and the image side surface 52 of the fifth lens 50 is concave; the sixth lens 60 has positive refractive power, and the object side surface 61 of the sixth lens 60 is convex, and the image side surface 62 of the sixth lens 60 is convex; the seventh lens 70 has negative refractive power, and the object side surface 71 of the seventh lens 70 is concave, and the image side surface 72 of the seventh lens 70 is concave. The lenses of the inner focus lens satisfy the above conditions, and in this preferred embodiment of the present application, the following conditions are preferably satisfied: f M f value is 2.856874385; |∑fn| / f value is 2.131044602; ∑R LnS1 / R LnS2 value is 1.48868; AFD max value is 0.093; CT1 / TTL value is 0.0872464; TTL max -TTL min value is 0.0644; TTL / (2*ImgH) value is 0.661929; SP value is 0.19; BFL / TTL value is 0.113696896591513; fup / fdown value is -0.89123344; ImageH value is 5.42.

[0122] In each of the embodiments according to the above embodiments, the aspherical surface equation of each of the lenses of the inner focus lens is represented as follows:

[0123]

[0124] wherein X is the relative distance of a point on the aspherical surface with a distance Y from the optical axis to the tangent plane of the aspherical surface at the intersection point of the optical axis; Y is the perpendicular distance of a point on the aspherical surface from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the aspherical coefficient of the i-th order.

[0125] In the preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field of view of the optical projection lens is FOV, which have the following values: f = 5.8 mm; Fno = 2; and FOV = 85 degrees.

[0126] Table 4 shows the structural parameters of each lens of the inner focusing lens of the second preferred embodiment of the present application.

[0127] Table 4

[0128]

[0129]

[0130] Table 4 shows the detailed structural data of each lens of the inner focusing lens of the second preferred embodiment of the present application, in which the units of the radius of curvature, the thickness and the focal length are mm. Table 5 shows the aspheric surface data of each lens of the inner focusing lens of the second preferred embodiment of the present application, in which K represents the conic coefficient in the aspheric surface equation, and A4-A20 represent the 4th-20th order aspheric surface coefficients of each surface. In addition, the following tables of each embodiment correspond to the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those of Table 4 and Table 5 of the embodiments, which are not described herein.

[0131] Table 5

[0132]

[0133]

[0134] In detail, in the preferred embodiment of the present application, the first lens 10, the second lens 20 and the third lens 30 of the inner focusing lens form the upper group lens set LI, the fifth lens 50, the sixth lens 60 and the seventh lens 70 form the lower group lens set L2, and the fourth lens 40 is arranged between the upper group lens set and the lower group lens set in a drivable manner. The fourth lens 40 of the inner focusing lens is implemented as the movable lens, and the upper group lens set is implemented as a movable lens set, i.e., the fourth lens 40 can be driven by the inner focusing motor to move along the optical axis direction, and the upper group lens set can also be driven along the optical axis direction. It can be understood that the fourth lens 40 can also be referred to as the middle group lens L3 of the inner focusing motor. When the object distance changes, the fourth lens 40 (movable lens) is driven by the inner focusing motor to move, so as to keep the image plane position formed by the inner focusing lens unchanged.

[0135] Briefly, in the preferred embodiment of the present application, the upper group lens set consisting of the first lens 10, the second lens 20, and the third lens 30 can be driven by the inner focusing motor to move integrally along the optical axis direction; the fourth lens 40 as a movable lens can also be driven by the inner focusing motor to move along the optical axis direction, thereby realizing the imaging position fixation of the inner focusing lens.

[0136] Table 6 shows the basic parameters of the inner focusing lens of the second preferred embodiment of the present application.

[0137] Table 6

[0138] Half image height 5.42 MIC 5.52 Fno 2 inf Wavelength 650:610:555:510:470＝107:503:1000:503:91 TTL 7.1767 inf 7.2411 30cm IR 0.21 FOV 85.00000643 inf 84.6 30cm Distortion optical 2.40％ inf RI 25.00％ D direction Object distance range 30CM ~ INF Group number 3 AF travel 29UM Upper group and middle group 93UM Middle group and lower group Upper middle group gap 0.576058652 inf 0.547380335 30cm Middle lower group gap 0.19 inf 0.283144533 30cm

[0139] In the preferred embodiment of the present application, the half image height ImgH value of the image plane formed by the inner focusing lens is 5.42, and the variable distance of the object distance is taken as an example, 30 cm-inf (infinity), wherein when the object distance is infinity, the optical total length TTL value of the optical system of the inner focusing lens is 7.1767 mm, and when the object distance is 30 cm, the optical total length TTL value of the inner focusing lens is 7.2411. When the object distance is infinity, the maximum view angle FOV value of the optical projection lens of the inner focusing lens is 85.0000064280624; and when the object distance is 30 cm, the maximum view angle FOV value of the optical projection lens of the inner focusing lens is 84.6. In the preferred embodiment of the present application, the stroke distance of the upper group lens set and the fourth lens 40 (movable lens) along the optical axis direction is 29 um; the stroke distance of the lower group lens set and the fourth lens 40 (movable lens) along the optical axis direction is 93 um. When the object distance is infinity, the gap between the fourth lens 40 and the upper group lens set is 0.576058651839191 mm, and the gap between the fourth lens 40 and the lower group lens set is 0.19; when the object distance is 30 cm, the gap between the fourth lens 40 and the upper group lens set is 0.547380334656721 mm, and the gap between the fourth lens 40 and the lower group lens set is 0.283144532700109.

[0140] Figure 6A and 6B It is shown that the inner focusing lens of the second preferred embodiment of the present application effectively improves the distortion of the lens when the object distance is inf and 30 cm. In particular, when the object distance is infinity, the distortion of the inner focusing lens is <2.40%. Figure 7A and Figure 7BThe astigmatism curves corresponding to the object distance of infinity and 30cm of the inner focusing lens of the second preferred embodiment of the present application are shown in the figure; Figure 8A and Figure 8B The axial chromatic aberration curves corresponding to the object distance of infinity and 30cm of the inner focusing lens of the second preferred embodiment of the present application are shown in the figure. It can be seen that the inner focusing lens of the second preferred embodiment of the present application effectively improves the astigmatism and chromatic aberration performance of the lens, and is beneficial to improve the imaging quality of the camera module.

[0141] Referring to the figures in the description of the present application Figures 9A to 12B An inner focusing lens according to the third preferred embodiment of the present application is illustrated in the following description with reference to the figures in the description of the present application. In this preferred embodiment of the present application, the first lens 10 has positive refractive power, and the object side surface 11 of the first lens is convex, and the image side surface 12 of the first lens 10 is concave; the second lens 20 has negative refractive power, and the object side surface 21 of the second lens is convex, and the image side surface 22 of the second lens 20 is concave; the third lens 30 has positive refractive power, and the object side surface 31 of the third lens is convex, and the image side surface 32 of the third lens 30 is concave; the fourth lens 40 has negative refractive power, and the object side surface 41 of the fourth lens is concave, and the image side surface 42 of the fourth lens 40 is convex; the fifth lens 50 has positive refractive power, and the object side surface 51 of the fifth lens is convex, and the image side surface 52 of the fifth lens 50 is convex; the sixth lens 60 has positive refractive power, wherein the object side surface 61 of the sixth lens 60 is concave, and the image side surface 62 of the sixth lens 60 is convex; the seventh lens 70 has negative refractive power, wherein the object side surface 71 of the seventh lens 70 is concave, and the image side surface 72 of the seventh lens 70 is concave. The lenses of the inner focusing lens satisfy the above conditional expressions, and in this preferred embodiment of the present application, it is preferred that: M The f value is 0.890931007847845; the |∑fn| / f value is 3.2738202318575; the ∑R LnS1 / R LnS2 The value is 2.39693; the AFD max The value is 0.307432; the CT1 / TTL value is 0.121166; the TTL max -TTL min The value is 0.307432; the TTL / (2*ImgH) value is 0.657226; the SP value is 0.18; the BFL / TTL value is 0.0792877; the fup / fdown value is -0.969469009643951; the ImageH value is 5.12.

[0142] In each of the embodiments according to the above-mentioned embodiment, the aspherical surface equation of each lens of the inner focusing lens is represented as follows:

[0143]

[0144] wherein X is the relative distance of a point on the aspherical surface with a distance Y from the optical axis to the tangent plane of the aspherical surface at the intersection point of the optical axis; Y is the perpendicular distance of the point on the aspherical surface from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient.

[0145] In this preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field of view of the optical projection lens is FOV, and the values are as follows: f = 5.8 mm; Fno = 2; and FOV = 85 degrees.

[0146] Table 7 shows the structural parameters of each lens of the inner focusing lens according to the third preferred embodiment of the present application.

[0147] Table 7

[0148]

[0149]

[0150] Table 7 shows the detailed structural data of each lens of the inner focusing lens according to the third preferred embodiment of the present application, wherein the units of the radius of curvature, the thickness and the focal length are mm. Table 8 shows the aspherical data of each lens of the inner focusing lens according to the third preferred embodiment of the present application, wherein K represents the conic coefficient in the aspherical surface equation, and A4-A20 represent the 4th-20th order aspherical coefficients of each surface. In addition, the following tables are the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those in Table 7 and Table 8 of the embodiments, which are not described herein.

[0151] Table 8

[0152]

[0153]

[0154] In detail, in the preferred embodiment of the present application, the inner focusing lens is composed of an upper lens group Ll and a lower lens group L2, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 form the upper lens group Ll, and the sixth lens 60 and the seventh lens 70 form the lower lens group L2, wherein the positions of the lenses of the lower lens group L2 are fixed, and the upper lens group Ll can move as a whole relative to the lower lens group L2, i.e. the upper lens group Ll can be driven by the inner focusing motor to move along the optical axis. It can be understood that when the object distance changes, the upper lens group Ll (movable lens) is driven by the inner focusing motor to move so as to keep the image plane position formed by the inner focusing lens unchanged.

[0155] Briefly, in the preferred embodiment of the present application, the upper lens group composed of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 can be driven by the inner focusing motor to move as a whole along the optical axis, thereby realizing the imaging position fixation of the inner focusing lens.

[0156] Table 9 shows the basic parameters of the inner focusing lens of the third preferred embodiment of the present application.

[0157] Table 9

[0158]

[0159] In the preferred embodiment of the present application, the image half height ImgH value of the image plane formed by the inner focusing lens is 5.12, and as an example, the changeable distance of the object distance is 10 cm-inf (infinity), wherein when the object distance is infinity, the total optical length TTL value of the optical system of the inner focusing lens is 6.73 mm, and when the object distance is 10 cm, the total optical length TTL value of the inner focusing lens is 7.0374. When the object distance is infinity (inf), the maximum view angle FOV value of the optical projection lens of the inner focusing lens is 80°, and when the object distance is 10 cm, the maximum view angle FOV value of the optical projection lens of the inner focusing lens is 78°. In the preferred embodiment of the present application, the stroke distance of the upper lens group Ll along the optical axis is 0.307431937 mm. When the object distance is infinity, the gap between the lower lens group L2 and the upper lens group Ll is 0.18 mm, and when the object distance is 10 cm, the gap between the lower lens group L2 and the upper lens group Ll is 0.487431937 mm.

[0160] Figure 10A and 10BThe inner focus lens of the third preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the third preferred embodiment of the present application effectively improves the distortion of the lens. Figure 11A and Figure 11B The inner focus lens of the third preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the third preferred embodiment of the present application effectively improves the distortion of the lens. Figure 12A and Figure 12B The inner focus lens of the third preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the third preferred embodiment of the present application effectively improves the distortion of the lens.

[0161] Referring to the drawings of the present application Figures 13A to 16B The inner focus lens according to the fourth preferred embodiment of the present application is illustrated in the following description. In this preferred embodiment of the present application, the first lens 10 has positive refractive power, and the object side surface 11 of the first lens 10 is convex, and the image side surface 12 of the first lens 10 is concave; the second lens 20 has negative refractive power, and the object side surface 21 of the second lens 20 is convex, and the image side surface 22 of the second lens 20 is concave; the third lens 30 has positive refractive power, and the object side surface 31 of the third lens 30 is convex, and the image side surface 32 of the third lens 30 is concave; the fourth lens 40 has negative refractive power, and the object side surface 41 of the fourth lens 40 is concave, and the image side surface 42 of the fourth lens 40 is convex; the fifth lens 50 has positive refractive power, and the object side surface 51 of the fifth lens 50 is convex, and the image side surface 52 of the fifth lens 50 is convex; the sixth lens 60 has positive refractive power, and the object side surface 61 of the sixth lens 60 is concave, and the image side surface 62 of the sixth lens 60 is convex; the seventh lens 70 has negative refractive power, and the object side surface 71 of the seventh lens 70 is concave, and the image side surface 72 of the seventh lens 70 is concave. The lenses of the inner focus lens satisfy the above conditional formula, and in this preferred embodiment of the present application, it is preferred that: M the f value is 0.885866176; the |∑fn| / f value is 7.895225; the ∑R LnS1 / R LnS2 value is 2.72652; the AFD max value is 0.396615; the CT1 / TTL value is 0.11645; the TTL max -TTL minThe value of X is 0.396615; the value of TTL / (2*ImgH) is 0.652826; the value of SP is 0.191748; the value of BFL / TTL is 0.0848515; the value of fup / fdown is -0.970083708286766; and the value of ImageH is 5.82.

[0162] In each of the embodiments according to the above-mentioned embodiment, the aspherical surface equation of each lens of the inner focus lens is represented as follows:

[0163]

[0164] wherein X is the relative distance of a point on the aspherical surface with a distance Y from the optical axis to the tangent plane of the aspherical surface at the intersection point of the optical axis; Y is the perpendicular distance of a point on the aspherical surface from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient.

[0165] In this preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field of view of the optical projection lens is FOV, and the values are as follows: f = 5.8 mm; Fno = 2; and FOV = 85 degrees.

[0166] Table 10 shows the structural parameters of each lens of the inner focus lens of the fourth preferred embodiment of the present application.

[0167] Table 10

[0168]

[0169]

[0170] Table 10 shows the detailed structural data of each lens of the inner focus lens of the fourth preferred embodiment of the present application, wherein the units of the radius of curvature, the thickness and the focal length are mm. Table 11 shows the aspherical data of each lens of the inner focus lens of the fourth preferred embodiment of the present application, wherein K represents the conic coefficient in the aspherical surface equation, and A4-A20 represent the 4th-20th order aspherical coefficients of each surface. In addition, the following tables of each embodiment are the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those of Table 10 and Table 11 of the embodiments, which are not described herein.

[0171] Table 11

[0172]

[0173]

[0174] In detail, in the preferred embodiment of the present application, the inner focus lens is composed of an upper lens group L1 and a lower lens group L2, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 form the upper lens group L1, and the sixth lens 60 and the seventh lens 70 form the lower lens group L2, wherein the positions of the lenses of the lower lens group L2 are fixed, and the upper lens group L1 can move as a whole relative to the lower lens group L2, i.e. the upper lens group L1 can be driven by the inner focus motor to move along the optical axis. It can be understood that when the object distance changes, the upper lens group L1 (movable lens) is driven by the inner focus motor to move so as to keep the image plane position formed by the inner focus lens unchanged.

[0175] Briefly, in the preferred embodiment of the present application, the upper lens group composed of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 can be driven by the inner focus motor to move as a whole along the optical axis, thereby realizing the imaging position of the inner focus lens fixed.

[0176] Table 12 shows the basic parameters of the inner focus lens of the fourth preferred embodiment of the present application.

[0177] Table 12

[0178]

[0179] In the preferred embodiment of the present application, the image half height ImgH value of the image plane formed by the inner focus lens is 5.82084578200054, and as an example, the changeable distance of the object distance is 10 cm-inf (infinity), wherein when the object distance is infinity, the total optical length TTL value of the optical system of the inner focus lens is 7.52 mm. When the object distance is infinity (inf), the maximum view angle FOV value of the optical projection lens of the inner focus lens is 80°. In the preferred embodiment of the present application, the travel distance of the upper lens group L1 along the optical axis is 0.397183 mm. When the object distance is infinity, the gap between the lower lens group L2 and the upper lens group L1 is 0.232654329754316 mm; when the object distance is 10 cm, the gap between the lower lens group L2 and the upper lens group L1 is 0.629837556671249 mm.

[0180] Figure 14A and 14BThe inner focus lens of the fourth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the fourth preferred embodiment of the present application effectively improves the distortion of the lens. Figure 15A and Figure 15B The inner focus lens of the fourth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the fourth preferred embodiment of the present application effectively improves the distortion of the lens. Figure 16A and Figure 16B The inner focus lens of the fourth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focus lens of the fourth preferred embodiment of the present application effectively improves the distortion of the lens.

[0181] Referring to the drawings of the present application Figures 17A to 20B The inner focus lens of the fifth preferred embodiment of the present application is shown in the following description. In the preferred embodiment of the present application, the first lens 10 has positive focal power, and the object side surface 11 of the first lens is convex, and the image side surface 12 of the first lens 10 is concave; the second lens 20 has negative focal power, and the object side surface 21 of the second lens is convex, and the image side surface 22 of the second lens 20 is concave; the third lens 30 has positive focal power, and the object side surface 31 of the third lens is convex, and the image side surface 32 of the third lens 30 is concave; the fourth lens 40 has negative focal power, and the object side surface 41 of the fourth lens is concave, and the image side surface 42 of the fourth lens 40 is convex; the fifth lens 50 has positive focal power, and the object side surface 51 of the fifth lens is convex, and the image side surface 52 of the fifth lens 50 is concave; the sixth lens 60 has positive focal power, and the object side surface 61 of the sixth lens 60 is concave, and the image side surface 62 of the sixth lens 60 is convex; the seventh lens 70 has negative focal power, and the object side surface 71 of the seventh lens 70 is concave, and the image side surface 72 of the seventh lens 70 is concave. The lenses of the inner focus lens meet the above condition formula, and in the preferred embodiment of the present application, it is preferred that: M The f value is 0.889264706; the |∑fn| / f value is 8.50639852941176; the ∑R LnS1 / R LnS2 value is 3.00093; the AFD max value is 0.397183; the CT1 / TTL value is 0.0968783; the TTL max -TTL minThe value of X is 0.397183; the value of TTL / (2*ImgH) is 0.645954; the value of SP is 0.232654; the value of BFL / TTL is 0.0914541; the value of fup / fdown is -0.973466713459179; and the value of ImageH is 5.82.

[0182] In each of the embodiments according to the above-mentioned embodiment, the aspherical surface equation of each lens of the inner focus lens is represented as follows:

[0183]

[0184] wherein X is the relative distance of a point on the aspherical surface with a distance Y from the optical axis to the tangent plane of the aspherical surface at the intersection point of the optical axis; Y is the perpendicular distance of a point on the aspherical surface from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient.

[0185] In this preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field of view of the optical projection lens is FOV, and the values are as follows: f = 5.8 mm; Fno = 2; and FOV = 85 degrees.

[0186] Table 13 shows the structural parameters of each lens of the inner focus lens of the fifth preferred embodiment of the present application.

[0187] Table 13

[0188]

[0189] Table 13 shows the detailed structural data of each lens of the inner focus lens of the fifth preferred embodiment of the present application, wherein the units of the radius of curvature, the thickness and the focal length are mm. Table 14 shows the aspherical data of each lens of the inner focus lens of the fifth preferred embodiment of the present application, wherein K represents the conic coefficient in the aspherical surface equation, and A4-A20 represent the 4th-20th order aspherical coefficients of each surface. In addition, the following tables are the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those in Table 13 and Table 14 of the embodiments, which are not described herein.

[0190] Table 14

[0191]

[0192]

[0193] In detail, in the preferred embodiment of the present application, the inner focus lens is composed of an upper lens group L1 and a lower lens group L2, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 form the upper lens group L1, and the sixth lens 60 and the seventh lens 70 form the lower lens group L2, wherein the positions of the lenses of the lower lens group L2 are fixed, and the upper lens group L1 can move as a whole relative to the lower lens group L2, i.e. the upper lens group L1 can be driven by the inner focus motor to move along the optical axis. It can be understood that when the object distance changes, the upper lens group L1 (movable lens) is driven by the inner focus motor to move so as to keep the image plane position formed by the inner focus lens unchanged.

[0194] Briefly, in the preferred embodiment of the present application, the upper lens group composed of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 can be driven by the inner focus motor to move as a whole along the optical axis, thereby realizing the imaging position of the inner focus lens fixed.

[0195] Table 15 shows the basic parameters of the inner focus lens of the fifth preferred embodiment of the present application.

[0196] Table 15

[0197]

[0198]

[0199] In the preferred embodiment of the present application, the image half height ImgH value of the image plane formed by the inner focus lens is 5.82084578200054, and as an example, the changeable distance of the object distance is 10 cm-inf (infinity), wherein when the object distance is infinity, the total optical length TTL value of the optical system of the inner focus lens is 7.52 mm. When the object distance is infinity (inf), the maximum view angle FOV value of the optical projection lens of the inner focus lens is 80°. In the preferred embodiment of the present application, the travel distance of the upper lens group L1 along the optical axis is 0.397183 mm. When the object distance is infinity, the gap between the lower lens group L2 and the upper lens group L1 is 0.232654329754316 mm; when the object distance is 10 cm, the gap between the lower lens group L2 and the upper lens group L1 is 0.629837556671249 mm.

[0200] Figure 18A and 18BThe inner focusing lens of the fifth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focusing lens of the fifth preferred embodiment of the present application effectively improves the distortion of the lens. Figure 19A and Figure 19B The inner focusing lens of the fifth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focusing lens of the fifth preferred embodiment of the present application effectively improves the distortion of the lens. Figure 20A and Figure 20B The inner focusing lens of the fifth preferred embodiment of the present application is shown in the corresponding distortion curves at the object distance of inf and 10cm. It can be seen that the inner focusing lens of the fifth preferred embodiment of the present application effectively improves the distortion of the lens.

[0201] Referring to the drawings of the present application Figures 21A to 24B The inner focusing lens according to the sixth preferred embodiment of the present application is illustrated in the following description. In this preferred embodiment of the present application, the first lens 10 has positive refractive power, and the object side surface 11 of the first lens 10 is convex, and the image side surface 12 of the first lens 10 is concave; the second lens 20 has negative refractive power, and the object side surface 21 of the second lens 20 is convex, and the image side surface 22 of the second lens 20 is concave; the third lens 30 has positive refractive power, and the object side surface 31 of the third lens 30 is convex, and the image side surface 32 of the third lens 30 is concave; the fourth lens 40 has negative refractive power, and the object side surface 41 of the fourth lens 40 is concave, and the image side surface 42 of the fourth lens 40 is convex; the fifth lens 50 has positive refractive power, and the object side surface 51 of the fifth lens 50 is convex, and the image side surface 52 of the fifth lens 50 is concave; the sixth lens 60 has positive refractive power, and the object side surface 61 of the sixth lens 60 is concave, and the image side surface 62 of the sixth lens 60 is convex; the seventh lens 70 has negative refractive power, and the object side surface 71 of the seventh lens 70 is concave, and the image side surface 72 of the seventh lens 70 is concave. The lenses of the inner focusing lens satisfy the above conditional formula, and in this preferred embodiment of the present application, it is preferred that: M the f value is 0.945422222; the |∑fn| / f value is 2.75903333333333; the ∑R LnS1 / R LnS2 value is 3.14458; the AFD max value is 0.185924; the CT1 / TTL value is 0.114148; the TTL max -TTL minThe value of X is 0.185924; the value of TTL / (2*ImgH) is 0.662084; the value of SP is 0.34777; the value of BFL / TTL is 0.0646081; the value of fup / fdown is -0.850344283101646; and the value of ImageH is 4.2.

[0202] In each of the embodiments according to the above-mentioned embodiment, the aspherical curve equation of each lens of the inner focus lens is represented as follows:

[0203]

[0204] wherein X is the relative distance of a point on the aspherical curve with a distance Y from the optical axis to the tangent plane of the aspherical curve at the intersection point of the optical axis; Y is the perpendicular distance of the point on the aspherical curve from the optical axis; R is the radius of curvature; k is the conic coefficient; and Ai is the i-th order aspherical coefficient.

[0205] In this preferred embodiment of the present application, the focal length of the optical projection lens is f, the f-number of the optical projection lens is Fno, and the maximum field angle of the optical projection lens is FOV, and the values are as follows: f = 5.8 mm; Fno = 2; and FOV = 85 degrees.

[0206] Table 16 shows the structural parameters of each lens of the inner focus lens of the sixth preferred embodiment of the present application.

[0207] Table 16

[0208]

[0209]

[0210] Table 16 shows the detailed structural data of each lens of the inner focus lens of the sixth preferred embodiment of the present application, wherein the units of the radius of curvature, the thickness and the focal length are mm. Table 17 shows the aspherical data of each lens of the inner focus lens of the sixth preferred embodiment of the present application, wherein K represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the 4th-20th order aspherical coefficients of each surface. In addition, the following tables of each embodiment are the schematic diagrams and the aberration curve diagrams of each embodiment, and the definitions of the data in the tables are the same as those of Table 16 and Table 17 of the embodiments, which are not described herein.

[0211] Table 17

[0212]

[0213]

[0214] In detail, in the preferred embodiment of the present application, the inner focus lens is composed of an upper lens group L1 and a lower lens group L2, wherein the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 form the upper lens group L1, and the sixth lens 60 and the seventh lens 70 form the lower lens group L2, wherein the positions of the lenses of the lower lens group L2 are fixed, and the upper lens group L1 can move as a whole relative to the lower lens group L2, i.e. the upper lens group L1 can be driven by the inner focus motor to move along the optical axis. It can be understood that when the object distance changes, the upper lens group L1 (movable lens) is driven by the inner focus motor to move so as to keep the image plane position formed by the inner focus lens unchanged.

[0215] Briefly, in the preferred embodiment of the present application, the upper lens group composed of the first lens 10, the second lens 20, the third lens 30, the fourth lens 40 and the fifth lens 50 can be driven by the inner focus motor to move as a whole along the optical axis, thereby realizing the imaging position of the inner focus lens fixed.

[0216] Table 18 shows the basic parameters of the inner focus lens of the sixth preferred embodiment of the present application.

[0217] Table 18

[0218]

[0219] In the preferred embodiment of the present application, the image half height ImgH value of the image plane formed by the inner focus lens is 4.20591839714915, and as an example, the changeable distance of the object distance is 10 cm-inf (infinity), wherein when the object distance is infinity, the total optical length TTL value of the optical system of the inner focus lens is 5.3232 mm. When the object distance is infinity (inf), the maximum view angle FOV value of the optical projection lens of the inner focus lens is 85°. In the preferred embodiment of the present application, the travel distance of the upper lens group L1 along the optical axis is 0.185924327 mm. When the object distance is infinity, the gap between the lower lens group L2 and the upper lens group L1 is 0.34777018569938 mm; when the object distance is 10 cm, the gap between the lower lens group L2 and the upper lens group L1 is 0.533694512735 mm.

[0220] Figure 22A and 22BThe inner focus lens of the sixth preferred embodiment of the present application is shown in the attached drawings. The corresponding distortion curves of the inner focus lens of the sixth preferred embodiment of the present application are shown in the attached drawings. It can be seen that the inner focus lens of the sixth preferred embodiment of the present application effectively improves the distortion of the lens. Figure 23A and Figure 23B The astigmatism curves of the inner focus lens of the sixth preferred embodiment of the present application are shown in the attached drawings. Figure 24A and Figure 24B The axial chromatic aberration curves of the inner focus lens of the sixth preferred embodiment of the present application are shown in the attached drawings. It can be seen that the inner focus lens of the sixth preferred embodiment of the present application effectively improves the astigmatism and chromatic aberration performance of the lens, which is beneficial to improve the imaging quality of the camera module.

[0221] The camera module according to another aspect of the present application is illustrated in the following description with reference to the attached drawings. Figure 25 The camera module according to another aspect of the present application is illustrated in the following description with reference to the attached drawings. The camera module according to another aspect of the present application is illustrated in the following description with reference to the attached drawings.

[0222] It should be understood by those skilled in the art that the above description and the embodiments of the present application shown in the attached drawings are only examples and do not limit the present application. The purpose of the present application has been fully and effectively achieved. The function and structural principle of the present application has been demonstrated and explained in the embodiments. Any modification or change of the embodiments of the present application can be made without departing from the principle.

Claims

1. An internal focusing lens, characterized in that, Comprising: A first lens with a positive focal length; A second lens with a negative focal length; A third lens with a positive focal length; A fourth lens with a positive focal length; A fifth lens with a negative focal length; A sixth lens with a positive focal length; and A seventh lens with a negative focal length, wherein the object side of the first lens is convex, the image side of the first lens is concave, the object side of the second lens is convex, the image side of the second lens is concave, the object side of the third lens is convex, the image side of the third lens is concave, the object side of the fourth lens is concave, the image side of the fourth lens is convex, the object side of the fifth lens is concave, the image side of the fifth lens is concave, the object side of the sixth lens is convex, the image side of the sixth lens is convex, the object side of the seventh lens is concave, the image side of the seventh lens is concave, wherein the first lens, the second lens and the third lens form an upper group lens set, the fourth lens is a middle group lens, the fifth lens, the sixth lens and the seventh lens form a lower group lens set, wherein the upper group lens set and the middle group lens are movable lens sets, and focusing is achieved by the movement of the movable lens sets, and the lower group lens set remains in place during the focusing process, wherein the thickness of the first lens on the optical axis is CT1, the total optical length of the optical system of the internal focusing lens is TTL, and the semi-image height of the image plane is ImgeH, and the following conditions are satisfied: 0.05 < CT1 / TTL < 0.15; 0.6 < TTL / (2*ImgeH) < 0.8, and the number of lenses with optical power is 7.

2. The internal focusing lens according to claim 1, wherein the seventh lens has the shape of an M-type lens.

3. The internal focusing lens according to claim 1, wherein the focal length of the internal focusing lens is f, and the focal length of the movable lens group is f. M Let the focal length of the nth lens be fn, and the radius of curvature of the nth lens near the object side be R. LnS1 The radius of curvature of the nth lens near the object side is R. LnS2 The maximum travel of the movable lens group is AFD, and the focal length of the upper lens group is f. 上 The focal length of the lower lens group is f. 下 It satisfies the following condition: 2.278877499≤f M / f<2.9; 1.68400519≤|∑fn| / f≤2.131044602; 1.48868≤∑R LnS1 / R LnS2 ≤1.61168; 0.09 <AFD<0.5;|f 上 / f 下 |<1.

4. The internal focusing lens according to claim 1, wherein the aspheric curve equations of each of the lenses of the internal focusing lens are expressed as follows: in: X is the relative distance of a point on the aspheric surface at a distance Y from the optical axis to the tangent plane at the intersection of the aspheric surface and the optical axis; Y is the perpendicular distance of a point on the aspheric curve from the optical axis; R is the radius of curvature; k is the conic coefficient; Ai is the i-th order aspheric coefficient.

5. A camera module, characterized in that, Comprising: An internal focusing lens; A photosensitive component, wherein the internal focusing lens is disposed on the photosensitive component; And At least one internal focusing motor, wherein the internal focusing lens comprises: A first lens with a positive focal length; A second lens with a negative focal length; A third lens with a positive focal length; A fourth lens with a positive focal length; ​ A sixth lens with a positive focal length, wherein the object side surface of the first lens is convex, the image side surface of the first lens is concave, the object side surface of the second lens is convex, the image side surface of the second lens is concave, the object side surface of the third lens is convex, the image side surface of the third lens is concave, the object side surface of the fourth lens is concave, the image side surface of the fourth lens is convex, the object side surface of the fifth lens is concave, the image side surface of the fifth lens is concave, the object side surface of the sixth lens is convex, the image side surface of the sixth lens is convex, the object side surface of the seventh lens is concave, and the image side surface of the seventh lens is concave; and A seventh lens with a negative focal length, wherein the first lens, the second lens, and the third lens form an upper group lens set, the fourth lens is a middle group lens, the fifth lens, the sixth lens, and the seventh lens form a lower group lens set, wherein the upper group lens set and the middle group lens are movable lens sets, and focusing is achieved by moving the movable lens sets. During the focusing process, the lower group lens set remains in place. Let the thickness of the first lens on the optical axis be CT1, the total optical length of the optical system of the internal focusing lens be TTL, and the semi-image height of the image plane be ImgeH. The following conditions are satisfied: 0.05 < CT1 / TTL < 0.15; 0.6 < TTL / (2*ImgeH) < 0.

8. The number of lenses with optical power is 7 pieces.

6. The imaging module according to claim 5, wherein the seventh lens has the shape of an M-type lens.

7. The camera module according to claim 6, wherein the focal length of the internal focusing lens is f, and the focal length of the movable lens group is f. M Let the focal length of the nth lens be fn, and the radius of curvature of the nth lens near the object side be R. LnS1 The radius of curvature of the nth lens near the object side is R. LnS2 The maximum travel of the movable lens group is AFD, and the focal length of the upper lens group is f. 上 The focal length of the lower lens group is f. 下 It satisfies the following condition: 2.278877499≤f M / f<2.9; 1.68400519≤|∑fn| / f≤2.131044602; 1.48868≤∑R LnS1 / R LnS2 ≤1.61168; 0.09 <AFD<0.5;|f 上 / f 下 |<1.

8. The imaging module according to claim 5, wherein the aspheric curve equations of each of the lenses of the internal focusing lens are expressed as follows: in: X is the relative distance of a point on the aspheric surface at a distance Y from the optical axis to the tangent plane at the intersection of the aspheric surface and the optical axis; Y is the perpendicular distance of a point on the aspheric curve from the optical axis; R is the radius of curvature; k is the conic coefficient; Ai is the i-th order aspheric coefficient.

Images