CN112154365B

CN112154365B - Imaging lens, imaging device and electronic equipment

Info

Publication number: CN112154365B
Application number: CN201980031306.4A
Authority: CN
Inventors: 毛庆; 陈媛
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-08-15
Filing date: 2019-08-15
Publication date: 2022-08-09
Anticipated expiration: 2039-08-15
Also published as: WO2021026874A1; CN112154365A

Abstract

An imaging lens includes, in order from an object side to an image side, a first lens unit (10), a second lens unit (20), a third lens unit (30), a fourth lens unit (40), a fifth lens unit (50), and a sixth lens unit (60). The positions of the first lens unit (10), the third lens unit (30), and the sixth lens unit (60) along the optical axis (91) are fixed, and the second lens unit (20), the fourth lens unit (40), and the fifth lens unit (50) are movable along the optical axis (91). The purpose of adjusting the focal length is achieved by adjusting the second lens unit (20), the fourth lens unit (40) and the fifth lens unit (50) to move along the optical axis (91) so as to perform focusing operation. The focusing mode of the movement of the plurality of groups of lens units is adopted, so that more focal length requirements can be met, and the miniaturization design of the imaging lens is facilitated.

Description

Imaging lens, imaging device and electronic equipment

Technical Field

The present invention relates to the field of optical imaging technologies, and in particular, to an imaging lens, an imaging device, and an electronic apparatus.

Background

In recent years, with the development of science and technology, portable electronic products have been gradually developed, and more people prefer a camera lens product with a small size, a high pixel and a large aperture.

In order to meet the requirement of miniaturization, the macro lens in the market at present usually adopts a single-group focusing mode, and when high shooting magnification is required, the length of the lens is often required to be very long so as to achieve the effect of a telephoto lens, so that the degree of miniaturization of the lens is low, portability cannot be realized, and the requirement of a higher-order lens cannot be met.

Disclosure of Invention

The invention provides an imaging lens, an imaging device and an electronic device.

Specifically, the invention is realized by the following technical scheme:

according to a first aspect of the present invention, there is provided an imaging lens including, in order from an object side to an image side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit, and a sixth lens unit;

the first lens unit, the third lens unit, and the sixth lens unit are fixed in position along an optical axis, and the second lens unit, the fourth lens unit, and the fifth lens unit are movable along the optical axis to perform a focusing operation.

According to a second aspect of the present invention, there is provided an imaging apparatus including an imaging lens and an electron-sensitive element provided on an imaging surface of the imaging lens. The imaging lens comprises a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit in sequence from an object side to an image side.

According to a third aspect of the present invention, there is provided an electronic apparatus including an apparatus body and an imaging device provided in the apparatus body, the imaging device including an imaging lens and an electron photosensitive element, the electron photosensitive element being provided on an imaging surface of the imaging lens. The imaging lens comprises a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit in sequence from an object side to an image side.

According to the technical scheme provided by the embodiment of the invention, the imaging lens provided by the embodiment of the invention can realize the purpose of adjusting the focal length by adjusting the second lens unit, the fourth lens unit and the fifth lens unit to move along the optical axis. The focusing mode of the movement of the plurality of groups of lens units is adopted, so that more focal length requirements can be met, and the miniaturization design of the imaging lens is facilitated.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of an imaging lens in an embodiment of the present invention.

Fig. 2 is a schematic structural diagram of an imaging lens in another state according to an embodiment of the present invention.

Fig. 3 is a cam line diagram of the imaging lens in an embodiment of the present invention.

Fig. 4 to 10 are schematic diagrams of product performance and product parameters of the imaging lens of the embodiment shown in fig. 1.

Fig. 11 is a schematic structural diagram of an imaging lens in another embodiment of the present invention.

Fig. 12 is a product parameter diagram of the imaging lens of the embodiment shown in fig. 11.

Fig. 13 is a schematic structural diagram of an imaging lens in a further embodiment of the present invention.

Fig. 14 is a product parameter diagram of the imaging lens of the embodiment shown in fig. 13.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides an imaging lens, an imaging device and an electronic apparatus. The following describes an imaging lens, an imaging device, and an electronic apparatus in detail with reference to the drawings. The features of the following examples and embodiments may be combined with each other without conflict.

An embodiment of the present invention provides an imaging lens, wherein the imaging lens includes a plurality of lens units. Further, the imaging lens has at least one lens unit fixed and at least one lens unit movable. For example, in one embodiment, one, two, three, four or more lens units may be provided fixed, and one, two, three, four or more lens units may be provided movable. Preferably, a plurality of lens units are fixed in the imaging lens, and the plurality of lens units are movable; the movable lens units may be moved individually or in a plurality of linked states. For example, in one embodiment, one, two, three, four or more lens units may be fixed, one, two, three, four or more lens units may be individually moved, and/or two, three, four or more lens units may be interlocked, which is not limited herein. Correspondingly, the embodiment of the invention also provides an imaging device and electronic equipment comprising the imaging lens.

The embodiment of the invention provides an imaging lens which can be used as a macro lens for macro shooting. The first, second, third, fourth, fifth, and sixth lens units may be included in order along an object side to an image side. The first lens unit, the third lens unit, and the sixth lens unit are fixed in position along an optical axis, and the second lens unit, the fourth lens unit, and the fifth lens unit are movable along the optical axis to perform a focusing operation.

Referring to fig. 1, the imaging lens of the present invention may be used as a macro lens for macro photography in an imaging system, and the imaging system may include an imaging lens and an imaging component, and a photographed object forms an image on the imaging component through the imaging lens. The imaging lens of the present invention may include a first lens unit 10, a second lens unit 20, a third lens unit 30, a fourth lens unit 40, a fifth lens unit 50, and a sixth lens unit 60. In the present embodiment, the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50, the sixth lens unit 60, and the imaging element are sequentially disposed along the optical axis 91 from an object side (which may be understood as a side of an object to be photographed, and which is illustrated as a left side in the drawing) to an image side (which may be understood as a side of an imaging surface 90 of the imaging element for imaging the object to be photographed, and which is illustrated as a right side in the drawing). The external light passes through the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50 and the sixth lens unit 60 in sequence, and the light passing through the sixth lens unit 60 is transmitted to the imaging surface 90 of the imaging assembly to complete imaging of the object to be photographed.

The positions of the first lens unit 10, the third lens unit 30, and the sixth lens unit 60 along the optical axis 91 are fixed, and the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 are movable along the optical axis 91 to perform a focusing operation. It is understood that, when a focusing operation from an object at infinity to an object at a close distance is performed, the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 may move back and forth along the optical axis 91, that is, when an image is formed from an object at infinity to an object at a close distance, the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 may move along the optical axis 91 toward the object side by the same amount of travel or different amounts of travel for focusing. When carrying out the macro-shooting, move along optical axis 91 through second lens unit 20, fourth lens unit 40 and fifth lens unit 50, the effect of focus can be reached in the propagation path that this kind of multiunit was focused, can change light and then satisfy more focal length requirements, and the function is abundanter.

Referring to fig. 2, a schematic diagram of group movement of the imaging lens of the present invention from infinity to close-range focusing is shown. When a macro-shooting is performed, when an object at a short distance is imaged from an object at infinity, the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 move along the optical axis 91 toward the object side to perform focusing, so as to meet the focusing requirement of the macro-shooting.

Compared with the traditional single-group focusing mode, namely a group of lens units moves, the propagation path of light rays can only generate a change trend, so that the distance between the lens units needs to reach a larger distance to meet the requirement of the focal length of a micro-distance shooting with a short distance, and the lens needs to correspondingly reach the length requirement, so that the product is large in size and inconvenient to carry. The invention adopts a multi-group focusing mode, the traveling amounts of the second lens unit, the fourth lens unit and the fifth lens unit can be different, the propagation paths of light rays can also generate various changing trends, the spacing distance between the lens units can be saved, the length of the lens is further reduced, and the miniaturization design of the imaging lens is facilitated.

In addition, the conventional single-group focusing mode partially adopts front group focusing, and when macro shooting is carried out, the forward extension of a lens can touch a shot object, so that the shooting effect is influenced. In the traditional single-group focusing mode, a part of the traditional single-group focusing mode adopts rear-group focusing, and the parts which are easily exposed in the air due to focusing increase the probability of dust being adsorbed into the lens. According to the imaging lens, the positions of the first lens unit and the sixth transparent group which are positioned on the outermost sides of the two opposite sides along the optical axis are fixed, so that the distance between the lens and a shot object is fixed during macro shooting, the shot object cannot be touched by mistake due to focusing, and the shooting quality is guaranteed. It is also possible to reduce the possibility that the dust of the components exposed to the air due to focusing is adsorbed into the lens.

The imaging lens of the present invention may include a housing in which the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50, the sixth lens unit 60, and the imaging component are disposed. The housing may be provided with a cam structure and an adjustment member cooperating with the cam structure, and the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 are adjusted to move along the optical axis 91 by rotating the adjustment member along the cam structure. Alternatively, the imaging lens of the present invention may include a first housing portion in which the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50, and the sixth lens unit 60 are mounted. Cam structures and corresponding adjustment members for adjusting the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 may be provided on the first housing portion.

The first lens unit 10 has positive refractive power, the second lens unit 20 has positive refractive power, the third lens unit 30 has negative refractive power, the fourth lens unit 40 has positive refractive power, the fifth lens unit 50 has positive refractive power, and the sixth lens unit 60 has negative refractive power. Through the arrangement, the focal power (i.e. the refractive power) of the imaging lens is reasonably matched, and clear imaging of objects with different object distances can be well obtained, so that different object image magnification ratios are achieved.

The first lens unit 10 can include a first lens element 11, wherein the first lens element 11 has positive refractive power, an object-side surface of the first lens element 11 is convex, and an image-side surface of the first lens element 11 is convex or concave, so as to effectively correct peripheral aberration at an off-axis position. When a focusing operation from an object at infinity to an object at a close distance is performed, the position of the first lens unit 10 along the optical axis 91 is fixed, which can be understood as the position of the first lens 11 on the optical axis 91 is fixed. Light rays emitted from an external object are transmitted into the first lens unit 10 from the object side of the first lens 11 of the first lens unit 10, and are transmitted into the second lens unit 20 from the image side of the first lens 11 of the first lens unit 10. In other examples, the number of lenses included in the first lens unit 10 may be set according to practical situations, and the present invention is not limited thereto.

The second lens unit 20 may include a second lens 21, a third lens 22, and a fourth lens 23. The second lens 21, the third lens 22, and the fourth lens 23 are disposed in this order along the optical axis 91, from the object side to the image side. The second lens 21, the third lens 22, and the fourth lens 23 may be bonded to each other by a glue. The second lens element 21 with positive refractive power has a convex object-side surface and a convex image-side surface, and the second lens element 21 is disposed on the object-side surface. The third lens element 22 with positive refractive power has a concave object-side surface and a concave image-side surface, and the third lens element 22 is disposed on the object-side surface. The fourth lens element 23 with positive refractive power has a convex object-side surface of the fourth lens element 23, and a convex or concave image-side surface of the fourth lens element 23. In other examples, the number of lenses included in the second lens unit 20 may be set according to practical situations, and the present invention is not limited thereto.

When a focusing operation from an object at infinity to an object at a close distance is performed, the second lens unit 20 moves along the optical axis 91, and it can be understood that the second lens 21, the third lens 22, and the fourth lens 23 move along the optical axis 91 in common. After passing through the first lens unit 10, light rays emitted from an external object are transmitted into the second lens unit 20 from the image side of the first lens 11 of the first lens unit 10, pass through the second lens 21, the third lens 22 and the fourth lens 23 in sequence, and finally are transmitted into the third lens unit 30 through the image side of the fourth lens 23.

Through the arrangement, the focal power of the lens in the second lens unit 20 is matched reasonably, and the imaging light ray collecting capability is good. The aberration generated by the first lens unit 10 can be effectively corrected, so that the aberration correction function in the first lens unit 10 is enhanced, the spherical aberration (namely, spherical aberration), astigmatism and distortion in the first lens unit 10 group can be better corrected, the first lens unit 10 can achieve the effect of correcting distortion, spherical aberration and chromatic aberration, the requirement of tolerance sensitivity is easily met, and meanwhile, the correction capability of high and low temperature performance is achieved.

The third lens unit 30 may include a fifth lens 31 and a sixth lens 32. The fifth lens 31 and the sixth lens 32 are disposed in order along the optical axis 91 from the object side to the image side. The fifth lens 31 and the sixth lens 32 may be bonded to each other by a glue. The fifth lens element 31 with positive refractive power has a convex or concave object-side surface of the fifth lens element 31, and a convex image-side surface of the fifth lens element 31. The sixth lens element 32 with negative refractive power has a concave object-side surface and a concave image-side surface, and the sixth lens element 32 is disposed on the object-side surface. In other examples, the number of lenses included in the third lens unit 30 may be set according to practical situations, and the present invention is not limited thereto.

When a focusing operation from an object at infinity to an object at a close distance is performed, the position of the third lens unit 30 along the optical axis 91 is fixed, which can be understood as the position of the fifth lens 31 and the sixth lens 32 on the optical axis 91 is fixed. After passing through the second lens unit 20, the light emitted from the external object is transmitted into the third lens unit 30 from the image side of the fourth lens 23 of the second lens unit 20, passes through the fifth lens 31 and the sixth lens 32 in sequence, and is finally transmitted into the fourth lens unit 40 through the image side of the sixth lens 32.

Through the arrangement, the focal power of the lens in the third lens unit 30 is reasonable in collocation, the third lens unit 30 has good capacity of collecting imaging light, the third lens unit 30 can be easily ensured to have a large image surface picture, a small image space chief ray included angle can be obtained, and imaging color reducibility is better. The aberration generated by the second lens unit 20 can be effectively corrected, so that the aberration correction effect in the second lens unit 20 is enhanced, the spherical aberration, astigmatism and distortion in the second lens unit 20 group can be better corrected, the second lens unit 20 can achieve the effect of correcting distortion, spherical aberration and chromatic aberration, the requirement of tolerance sensitivity is easily met, and meanwhile, the correction capability of certain high and low temperature performance is achieved.

The third lens unit 30 may further include an iris diaphragm 33 to adjust the amount of light passing into the lens. The variable aperture stop 33 may be disposed between the third lens unit 30 and the fourth lens unit 40, that is, between the sixth lens 32 and the fourth lens unit 40. Optionally, the diaphragm type of the variable aperture 33 may include a flare diaphragm (Glare Stop) or a Field Stop (Field Stop), etc., which may be used to reduce stray light and help improve image quality.

The fourth lens unit 40 can include a seventh lens element 41, and the seventh lens element 41 has positive refractive power. The variable aperture 33 may be disposed between the sixth lens 32 and the seventh lens 41. When a focusing operation from an object at infinity to an object at a close distance is performed, the fourth lens unit 40 moves along the optical axis 91, which can be understood as the seventh lens 41 moving along the optical axis 91. After passing through the third lens unit 30, the light emitted from the external object is transmitted into the fourth lens unit 40 from the image side of the sixth lens 32 of the third lens unit 30, passes through the seventh lens 41, and is transmitted into the fifth lens unit 50 through the image side of the seventh lens 41. In other examples, the number of lenses included in the fourth lens unit 40 may be set according to practical situations, and the present invention is not limited thereto.

The fifth lens unit 50 may include an eighth lens 51 and a ninth lens 52. The eighth lens 51 and the ninth lens 52 are disposed in order along the optical axis 91 from the object side to the image side. The eighth lens 51 and the ninth lens 52 may be bonded to each other by a glue. The eighth lens element 51 with negative refractive power has a convex object-side surface and a concave image-side surface. The ninth lens element 52 with positive refractive power has a convex object-side surface of the ninth lens element 52, and a convex or concave image-side surface of the ninth lens element 52. In other examples, the number of lenses included in the fifth lens unit 50 may be set according to practical situations, and the present invention is not limited thereto.

When a focusing operation from an object at infinity to an object at a close distance is performed, the fifth lens unit 50 moves along the optical axis 91, and it can be understood that the eighth lens 51 and the ninth lens 52 move together along the optical axis 91. After passing through the fourth lens unit 40, light rays emitted from an external object are transmitted into the fifth lens unit 50 from the image side of the seventh lens 41 of the fourth lens unit 40, pass through the eighth lens 51 and the ninth lens 52 in sequence, and are finally transmitted into the sixth lens unit 60 through the image side of the ninth lens 52.

With the above arrangement, the focal powers of the lenses in the fifth lens unit 50 are reasonably matched, and the fifth lens unit has a good capability of collecting imaging light. The aberration generated by the fourth lens unit 40 can be effectively corrected, so that the aberration correction function in the fourth lens unit 40 is enhanced, the spherical aberration, astigmatism and distortion in the fourth lens unit 40 group can be better corrected, the fourth lens unit 40 can achieve the effect of correcting distortion, spherical aberration and chromatic aberration, the requirement of tolerance sensitivity is easily met, and meanwhile, the fourth lens unit has certain high-temperature and low-temperature performance correction capability.

In the present embodiment, a first air interval is provided between the object-side surface of the fourth lens unit 40 and the iris diaphragm 33, a second air interval is provided between the image-side surface of the fourth lens unit 40 and the object-side surface of the fifth lens unit 50, and a third air interval is provided between the image-side surface of the fifth lens unit 50 and the object-side surface of the sixth lens unit 60. In one embodiment, the fourth lens unit 40 and the fifth lens unit 50 are ganged lens units, and the sum of the first air interval, the second air interval, and the third air interval is constant.

Referring to fig. 3, the moving amounts (i.e., the amounts of travel) of the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 of the imaging lens of the present invention are schematically changed with the rotational angle from infinity to close-up focusing, and it can be understood as a cam line diagram drawn with the initial positions of the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 at infinity as the origin. As shown in fig. 3, the cam line is smooth, and no inflection point is provided, and through the above arrangement, the first derivative of the travel amounts of the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50 with respect to the angle is avoided to be 0 during the focusing process of the imaging lens, so as to ensure smooth movement trajectories of the second lens unit 20, the fourth lens unit 40, and the fifth lens unit 50, and facilitate the user operation when adjusting the focal length.

The sixth lens unit 60 may include a tenth lens 61, an eleventh lens 62, and a twelfth lens 63. The tenth lens 61, the eleventh lens 62, and the twelfth lens 63 are disposed in this order along the optical axis 91 from the object side to the image side. The tenth lens 61, the eleventh lens 62, and the twelfth lens 63 may be bonded to each other by a glue. The tenth lens element 61 with positive refractive power has a convex or concave object-side surface of the tenth lens element 61, and a convex image-side surface of the tenth lens element 61. The eleventh lens element 62 with negative refractive power has a concave object-side surface of the eleventh lens element 62, and a convex or concave image-side surface of the eleventh lens element 62. The twelfth lens element 63 with negative refractive power has a convex or concave object-side surface of the twelfth lens element 63, and a convex image-side surface of the twelfth lens element 63. In other examples, the number of lenses included in the sixth lens unit 60 may be set according to practical situations, and the present invention is not limited thereto.

When a focusing operation from an object at infinity to an object at a close distance is performed, the position of the sixth lens unit 60 along the optical axis 91 is fixed, which can be understood as the position of the tenth lens 61, the eleventh lens 62, and the twelfth lens 63 on the optical axis 91 is fixed. After passing through the fifth lens unit 50, the light emitted by the external object is transmitted into the sixth lens unit 60 from the image side of the ninth lens element 52 of the fifth lens unit 50, passes through the tenth lens element 61, the eleventh lens element 62 and the twelfth lens element 63 in sequence, and finally is transmitted to the imaging surface 90 of the imaging assembly through the image side of the twelfth lens element 63 to form an image.

Through the arrangement, the focal power of the lens in the sixth lens unit 60 is reasonable in collocation, and the sixth lens unit 60 has good capability of collecting imaging light, so that the sixth lens unit 60 can be easily ensured to have a large image plane frame, and meanwhile, a small image space chief ray included angle is obtained, and the imaging color reducibility is better. The aberration generated by the fifth lens unit 50 can be effectively corrected, so that the aberration correction function in the fifth lens unit 50 is enhanced, the spherical aberration, astigmatism and distortion in the group of the fifth lens unit 50 can be better corrected, the fifth lens unit 50 can achieve the effect of correcting distortion, spherical aberration and chromatic aberration, the requirement of tolerance sensitivity is easily met, and meanwhile, the correction capability of high and low temperature performance is provided.

When an object at a short distance is imaged from an object at infinity in macro photography, the second lens 21, the third lens 22, and the fourth lens 23 of the second lens unit 20, the seventh lens 41 of the fourth lens unit 40, and the eighth lens 51 and the ninth lens 52 of the fifth lens unit 50 all move along the optical axis 91 toward the object side for focusing, so that the focusing requirement of macro photography is met.

The imaging lens may further include a protective sheet, which may be disposed between the twelfth lens 63 of the sixth lens unit 60 and the imaging surface 90 of the imaging member, and may protect the lenses. Alternatively, the protective sheet may include a glass lens and an optical filter.

The material of each lens unit may be plastic or glass. When the lens is made of glass, the degree of freedom of the refractive power configuration can be increased. When the lens is made of plastic, the production cost can be effectively reduced. In addition, an Aspheric Surface (ASP) can be arranged on the surface of the lens, the ASP can be easily made into shapes other than a spherical surface, more control variables are obtained for reducing aberration, and the number of the lenses required to be used is further reduced, so that the total optical length of the imaging lens can be effectively reduced, and further miniaturization is achieved.

In an optional embodiment, in the imaging lens of the present invention, in an arbitrary focusing state, a distance from a vertex of an object-side surface of a first lens unit with refractive power along an object-side to image-side direction of the imaging lens to the imaging surface 90 is TTL, and a total focal length of the imaging lens is EFL when an object at infinity is clearly imaged onto the imaging surface 90, where the imaging lens satisfies the following conditional expressions: TTL/EFL is more than or equal to 1 and less than or equal to 2. Optionally, in this embodiment, the first lens element 11 of the first lens unit 10 has positive refractive power, and the distance from the vertex of the first object-side surface with refractive power of the object-side surface of the imaging lens in any focusing state to the imaging surface 90 may be the distance from the vertex of the first object-side surface of the first lens element 11 of the first lens unit 10 in any focusing state to the imaging surface 90.

Through the arrangement, the total length of the imaging lens can be better ensured on the premise of ensuring the imaging quality of the imaging lens, so that the imaging lens is smaller in size and lighter in weight. In the imaging lens of the invention, the shooting magnification M at infinity is greater than or equal to 1:2, and the shooting magnification M can be understood as the ratio of the absolute value of the object height corresponding to the object side to the absolute value of the image height corresponding to the image side. Thus, the maximum magnification of the medium picture is 1:2, and uniform and consistent image quality, low distortion characteristic and excellent temperature performance are obtained.

In the imaging lens of the present invention, the second lens unit 20 has a focal length F ₂ The imaging lens meets the following conditional expression: absolute F of 0.4 ≤ ₂ EFL | is less than or equal to 3. Further, the fourth lens unit 40 has a focal length F ₄ The imaging lens meets the following conditional expression: 0.3 ≤ F ₄ EFL | is less than or equal to 1.5. Further, the fifth lens unit 50 has a focal length F ₅ The imaging lens meets the following conditional expression: greater than or equal to 1 | F ₅ EFL | is less than or equal to 3. Through the arrangement, the imaging lens can achieve better imaging effect and imaging quality.

In the imaging lens, when an object at infinity is clearly imaged on an imaging surface 90 of an imaging assembly, the opening diaphragm number of the imaging lens is Fno when the diameter of the variable diaphragm 33 reaches the maximum value, and the imaging lens meets the following conditional expression: fno is more than or equal to 32 and more than or equal to 2. Through the arrangement, the light transmission quantity of the light entering the lens can be better adjusted.

In an alternative embodiment, in the imaging lens of the present invention, when a focusing operation from an object at infinity to an object at a close distance is performed, the absolute value of the amount of travel of the second lens unit 20 on the optical axis 91 is D ₂ The imaging lens meets the following conditional expression: d is more than or equal to 0.05 ₂ /EFL≤0.4。

When the above conditional formula D ₂ When the EFL is lower than the lower limit, the effect of the second lens unit 20 on correcting the imaging aberration of the object at the close distance is reduced, and if the same effect as the embodiment is required, the overall refractive power of the second lens unit needs to be increased, thereby improving the system sensitivity. The sensitivity is lower, the requirement of assembly and matching is lower,

when the above conditional formula D ₂ When the EFL is higher than the upper limit, the distance between the surface of the first lens unit 10 closest to the image side surface (i.e., the image side surface of the first lens 11) and the surface of the third lens unit closest to the object side surface (i.e., the fifth lens 31) on the optical axis 91 needs to be increased to avoid the occurrence of interference between the second lens unit 20 and at least one of the two, which may result in an increase in the overall length of the imaging lens.

Therefore, with the above arrangement, conditional expression D is ₂ The value range of/EFL is set to be D which is more than or equal to 0.05 ₂ The EFL is less than or equal to 0.4, the second lens unit 20 has a good effect of correcting the imaging aberration of a close-distance object, so that the sensitivity of an imaging system can be improved, the requirements of assembly and collocation can be reduced, the fault tolerance rate of the system during assembly can be improved, and the imaging lens can be normally used in more scenes. In addition, the occurrence of interference between the second lens unit 20 and at least one of the first lens unit 10 and the third lens unit 30 can be effectively avoided, so that the total length of the lens can be controlled, and the design requirement of miniaturization can be met.

In the imaging lens of the present invention, when a focusing operation from an object at infinity to an object at a close distance is performed, the absolute value of the amount of travel of the fourth lens unit 40 on the optical axis 91 is D ₄ The imaging lens meets the following conditional expression: d is not less than 0.075 ₄ the/EFL is less than or equal to 0.3. Further, when a focusing operation from an object at infinity to an object at a close distance is performed, the absolute value of the amount of travel of the fifth lens unit 50 on the optical axis 91 is D ₅ The imaging lens meets the following conditional expression: d is more than or equal to 0.2 ₅ the/EFL is less than or equal to 0.4. With the above arrangement, the moving trajectories of the fourth lens unit 40 and the fifth lens unit 50 can be made smoother, and the user operation is facilitated when adjusting the focal length.

In an alternative embodiment of the imaging lens of the present invention, the second lens unit 20 may include at least one lens, and an abbe number of a lens closest to the object side surface in the second lens unit 20 is V ₂ The imaging lens meets the following conditional expression: v is more than or equal to 65 ₂ Is less than or equal to 97. In the present embodiment, the lens closest to the object side surface in the second lens unit 20 may refer to the object side surface of the second lens 21. The fourth lens unit 40 may include at least one lens, and an abbe number of a lens closest to an object side surface in the fourth lens unit 40 is V ₄ The imaging lens meets the following conditional expression: v is more than or equal to 50 ₄ Is less than or equal to 97. In the present embodiment, the lens closest to the object side surface in the fourth lens unit 40 may refer to the object side surface of the seventh lens 41. By the above arrangementThe method can perform chromatic aberration compensation on the imaging image, thereby reducing the influence of chromatic dispersion on the imaging quality.

In the imaging lens of the present invention, the surface curvature of the fourth lens unit 40 closest to the object side is C ₁ A curvature of a surface of the fourth lens unit 40 closest to the image side surface is C ₂ The imaging lens meets the following conditional expression: -1.0 ≦ (C) ₁ +C ₂ )/(C ₁ -C ₂ ) Less than or equal to 1.0. Through the arrangement, the distortion capability of the imaging lens can be effectively eliminated, and meanwhile, the optical system of the imaging lens has better flat field curvature capability.

Referring to fig. 4 to 10, fig. 4 is a longitudinal spherical aberration diagram in a state where an object at infinity is clearly imaged on the imaging lens of the present invention. Spherical aberration occurs with respect to the C-line, d-line, and F-line, the C-line has a wavelength of 656.3nm, the d-line has a wavelength of 587.6nm, and the F-line has a wavelength of 486.1 nm. Fig. 5 is a graph of astigmatic field curvatures in which a solid line is an aberration with respect to a sagittal image plane and a dotted line is an aberration with respect to a meridional image plane, and distortion of an imaging lens in a state in which an infinitely distant object is clearly imaged on an imaging system. Fig. 6 is a longitudinal spherical aberration graph of a focusing structure of the imaging lens with a magnification of 0.5 in a clear imaging state on the imaging system. Wherein spherical aberration occurs with respect to C-line, d-line and F-line, the C-line having a wavelength of 656.3nm, the d-line having a wavelength of 587.6nm, and the F-line having a wavelength of 486.1 nm. Fig. 7 is a graph of astigmatic field curvature and distortion in which a solid line is an aberration with respect to a sagittal image plane and a broken line is an aberration with respect to a meridional image plane in a state where a focusing structure of the imaging lens is clearly imaged on the imaging system at a magnification of 0.5. Fig. 8 is a lens parameter of an infinite end (inf end) of the imaging lens. Fig. 9 is a diagram of respective surface data tables of the imaging lens, and R represents a radius of curvature, which may be in mm. D represents the on-axis distance and may be in mm. N represents the refractive index, V represents the Abbe number, and the effect of correcting chromatic aberration is better realized by selecting the reasonable Abbe number based on the reasonable collocation of focal power. In one embodiment, the 24 th surface may be a surface of the imaging lens using an infrared filter, and the 25 th surface may be a surface of the imaging lens using glass. Fig. 10 is a distribution of the respective variable pitches of the imaging lens in a state where an object at infinity is clearly imaged on the imaging system and the lens magnification is 0.5.

As can be seen from fig. 4 to 10, the imaging lens of the present invention has small positional chromatic aberration, small distortion, high contrast, and small magnification chromatic aberration. Therefore, the imaging lens provided by the embodiment of the invention can be applied to a mobile focusing optical system according to requirements, and has the characteristics of excellent aberration correction and good imaging quality. The imaging lens provided by the embodiment of the invention can also be applied to electronic equipment such as three-dimensional (3D) image acquisition, digital cameras, mobile devices, tablet computers, intelligent televisions, network monitoring equipment, automobile data recorders, reversing developing devices, motion sensing game machines, wearable devices and the like in many aspects.

Referring to fig. 11 and 12, in an alternative embodiment, the imaging lens of the present invention may further include a seventh lens unit 70, where the seventh lens unit 70 is located on a side of the first lens unit 10 close to the object side, so as to achieve a shooting magnification of the imaging lens at a short distance of 1:1, and further improve the definition and the imaging quality of macro shooting. In this embodiment, the seventh lens unit 70 may be disposed in the first housing portion and located on the side of the first lens 11 of the first lens unit 10 close to the object side. Fig. 12 is a data table diagram of each surface of the imaging lens in the present embodiment.

In order that the imaging lens as a whole can clearly image at a larger magnification, the seventh lens unit 70 may include a thirteenth lens 71, a fourteenth lens 72, and a fifteenth lens 73. The thirteenth lens 71, the fourteenth lens 72, and the fifteenth lens 73 are disposed in order along the optical axis 91 from the object side to the image side. The thirteenth lens element 71 with positive refractive power, the fourteenth lens element 72 with negative refractive power, and the fifteenth lens element 73 with positive refractive power. The thirteenth lens 71, the fourteenth lens 72, and the fifteenth lens 73 may be bonded to each other by a glue.

In this embodiment, the distance from the vertex of the first object-side surface with refractive power of the object-side surface of the imaging lens assembly to the imaging plane 90 in the arbitrary focusing state may be a distance from the vertex of the object-side surface of the thirteenth lens element 71 to the imaging plane 90 in the arbitrary focusing state. Through the arrangement, the maximum value of the shooting magnification of the imaging lens at infinity can reach 1:1, and the definition and the imaging quality of macro shooting are further improved.

In the imaging lens system of the present invention, the fourteenth lens element 72 has a focal length F _s The imaging lens meets the following conditional expression: i F _s EFL | > or more than 0.4. Through the arrangement, the imaging lens can achieve better imaging effect and imaging quality.

In an alternative embodiment, the imaging lens of the present invention may further include a second housing portion, and the second housing portion is detachably mounted on a side of the first housing portion close to the object side, that is, the second housing portion may be mounted on a front portion of the first housing portion. The seventh lens unit 70 may be mounted in the second housing portion, that is, the thirteenth lens 71, the fourteenth lens 72, and the fifteenth lens 73 are all mounted in the second housing portion.

In this way, the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50, and the sixth lens unit 60 are all mounted in the first housing portion, and may be understood as forming a first lens assembly, and the seventh lens unit 70 is mounted in the second housing portion, and may be understood as forming a second lens assembly, and the two lens assemblies may be detachably assembled with each other. When the imaging lens is in a shooting scene needing to reach 1:1 shooting magnification, a first lens assembly can be installed on a main body assembly of the imaging device, and then a second lens assembly is installed on the first lens assembly. When the imaging lens is in a shooting scene without the shooting magnification of 1:1, the second lens component can be detached from the first lens component, so that the imaging lens can be more flexibly used, the imaging lens is convenient to carry, and the problem that the product is too heavy is avoided.

Referring to fig. 13 and 14, in an alternative embodiment, the imaging lens of the present invention may further include an eighth lens unit 80, where the eighth lens unit 80 is located on a side of the sixth lens unit 60 close to the image side surface, so as to achieve a shooting magnification of the imaging lens at a short distance of 1:1, and further improve the definition and the imaging quality of macro shooting. In this embodiment, the eighth lens unit 80 may be disposed in the first housing portion on a side of the twelfth lens 63 of the sixth lens unit 60 close to the image side surface. Fig. 14 is a data table diagram of each surface of the imaging lens in the present embodiment.

In order that the imaging lens as a whole can clearly image at a larger magnification, the eighth lens unit 80 may include a sixteenth lens 81, a seventeenth lens 82, and an eighteenth lens 83. The sixteenth lens 81, the seventeenth lens 82, and the eighteenth lens 83 are disposed in this order along the optical axis 91, from the object side to the image side. The sixteenth lens element 81 with negative refractive power, the seventeenth lens element 82 with positive refractive power, and the eighteenth lens element 83 with negative refractive power. The sixteenth lens 81, the seventeenth lens 82, and the eighteenth lens 83 may be bonded to each other by a glue.

In the imaging lens of the present invention, the seventeenth lens 82 has a focal length F _t The imaging lens meets the following conditional expression: i F _t EFL | > or more than 0.4. Through the arrangement, the imaging lens can achieve better imaging effect and imaging quality.

In an alternative embodiment, the imaging lens of the present invention may further include a third housing portion, and the third housing portion is detachably mounted on a side of the first housing portion close to the image side surface, that is, the third housing portion may be mounted on a rear portion of the first housing portion. The eighth lens unit 80 may be mounted within the third housing portion, i.e., the sixteenth lens 81, the seventeenth lens 82, and the eighteenth lens 83 are all mounted within the third housing portion.

In this way, the first lens unit 10, the second lens unit 20, the third lens unit 30, the fourth lens unit 40, the fifth lens unit 50, and the sixth lens unit 60 are all mounted in the first housing portion, and may be understood as forming a first lens assembly, and the eighth lens unit 80 is mounted in the third housing portion, and may be understood as forming a second lens assembly, and the two lens assemblies may be detachably assembled with each other. When the imaging lens is in a shooting scene needing to reach 1:1 shooting magnification, the second lens assembly can be arranged on the main body component of the imaging device, and then the first lens assembly is arranged on the second lens assembly. When the imaging lens is in a shooting scene without the requirement of reaching 1:1 shooting magnification, the first lens component can be detached from the second lens component, the second lens component is detached from the main body component of the imaging device, and the first lens component is installed on the main body component of the imaging device, so that the imaging lens can be more flexibly used, the imaging lens is convenient to carry, and the problem that the product is too heavy is avoided.

The embodiment of the invention also provides an imaging device, which can comprise an imaging lens and an electronic photosensitive element, wherein the electronic photosensitive element is arranged on the imaging surface of the imaging component of the imaging lens. It should be noted that the descriptions about the imaging lens in the above embodiments and embodiments are also applicable to the imaging device of the present invention. The imaging device of the invention adopts the imaging lens, can be applied to an optical system for moving focusing according to requirements, and has the characteristics of excellent aberration correction and good imaging quality. The imaging lens provided by the embodiment of the invention can also be applied to electronic equipment such as three-dimensional (3D) image acquisition, digital cameras, mobile devices, tablet computers, intelligent televisions, network monitoring equipment, automobile data recorders, reversing developing devices, motion sensing game machines, wearable devices and the like in many aspects.

The embodiment of the invention also provides electronic equipment which comprises an equipment body and an imaging device arranged on the equipment body. The imaging device may include an imaging lens and an electronic photosensitive element, and the electronic photosensitive element is disposed on an imaging surface of the imaging lens. It should be noted that the descriptions about the imaging lens in the above embodiments and embodiments are also applicable to the electronic device of the present invention. The electronic device of the invention adopts the imaging lens, and can be electronic devices such as three-dimensional (3D) image acquisition, a digital camera, a mobile device, a tablet personal computer, an intelligent television, a network monitoring device, a driving recorder, a reversing developing device, a motion sensing game machine, a wearable device and the like.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The holder handle and the holder having the holder handle provided by the embodiment of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in detail herein by applying specific examples, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An imaging lens includes, in order from an object side to an image side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit, and a sixth lens unit;

the first lens unit, the third lens unit, and the sixth lens unit are fixed in position along an optical axis, and the second lens unit, the fourth lens unit, and the fifth lens unit are movable along the optical axis to perform a focusing operation;

the first lens unit has positive refractive power, the second lens unit has positive refractive power, the third lens unit has negative refractive power, the fourth lens unit has positive refractive power, the fifth lens unit has positive refractive power, and the sixth lens unit has negative refractive power;

the second lens unit sequentially comprises a second lens with positive refractive power, a third lens with negative refractive power and a fourth lens with positive refractive power from the object side to the image side.

2. The imaging lens assembly of claim 1, wherein a distance from a vertex of an object side surface of a first lens unit with refractive power along an object-side to image-side direction to an imaging plane of the imaging lens assembly in an arbitrary focusing state is TTL, and a total focal length of the imaging lens assembly in a state of clearly imaging an object at infinity to the imaging plane is EFL, and the imaging lens assembly satisfies the following conditional expressions: TTL/EFL is more than or equal to 1 and less than or equal to 2.

3. The imaging lens assembly of claim 1, wherein the first lens element includes a first lens element with positive refractive power, and a distance from a vertex of an object side surface of a first lens element with refractive power along an object-side to image-side direction to an image plane of the imaging lens assembly in any focusing state is a distance from the vertex of the object side surface of the first lens element to the image plane in any focusing state.

4. The imaging lens of claim 3, wherein the object side surface of the first lens is convex.

5. The imaging lens assembly of claim 1, wherein the second lens element has a convex object-side surface and a convex image-side surface.

6. The imaging lens assembly of claim 1, wherein the third lens element has a concave object-side surface and a concave image-side surface.

7. The imaging lens of claim 1, wherein an object side surface of the fourth lens is convex.

8. The imaging lens assembly of claim 1, wherein the third lens unit comprises a fifth lens element with positive refractive power and a sixth lens element with negative refractive power in order from an object side to an image side.

9. The imaging lens assembly as claimed in claim 8, wherein the image side surface of the fifth lens element is convex.

10. The imaging lens assembly of claim 8, wherein the sixth lens element has a concave object-side surface and a concave image-side surface.

11. The imaging lens of claim 1, wherein the fourth lens unit comprises a seventh lens with positive refractive power.

12. The imaging lens assembly of claim 1, wherein the fifth lens unit sequentially comprises an eighth lens element with negative refractive power and a ninth lens element with positive refractive power from the object side to the image side.

13. The imaging lens assembly of claim 12, wherein the eighth lens element has a convex object-side surface and a concave image-side surface.

14. The imaging lens of claim 13, wherein an object side surface of the ninth lens is convex.

15. The imaging lens assembly of claim 1, wherein the sixth lens unit sequentially includes a tenth lens element with positive refractive power, an eleventh lens element with negative refractive power and a twelfth lens element with negative refractive power from the object side to the image side.

16. The imaging lens assembly as claimed in claim 15, wherein the image side surface of the tenth lens element is convex.

17. The imaging lens of claim 15, wherein an object side surface of the eleventh lens is concave.

18. The imaging lens assembly as claimed in claim 15, wherein the image side surface of the twelfth lens element is convex.

19. The imaging lens according to claim 1, wherein an absolute value of a travel amount of the second lens unit on an optical axis at a time of a focusing operation of the imaging lens is D ₂ The imaging lens meets the following conditional expression: d is more than or equal to 0.05 ₂ /EFL≤0.4。

20. The imaging lens of claim 1, wherein the second lens unit has a focal length of F ₂ The imaging lens meets the following conditional expression: absolute F of 0.4 ≤ ₂ /EFL|≤3。

21. The imaging lens according to claim 1, wherein the second lens unit includes at least one lens, and an abbe number of a lens closest to an object side surface in the second lens unit is V ₂ The imaging lens meets the following conditional expression: v is more than or equal to 65 ₂ ≤97。

22. The imaging lens according to claim 1, wherein an absolute value of a travel amount of the fourth lens unit on an optical axis at a time of a focusing operation of the imaging lens is D ₄ The imaging lens meets the following conditional expression: d is not less than 0.075 ₄ /EFL≤0.3。

23. The imaging lens of claim 1, wherein the fourth lens unit has a focal length of F ₄ The imaging lens meets the following conditional expression: 0.3 ≤ F ₄ /EFL|≤1.5。

24. The imaging lens according to claim 1, wherein a surface curvature of the fourth lens unit closest to the object side is C ₁ The surface curvature of the fourth lens unit closest to the image side surface is C ₂ The imaging lens meets the following conditional expression: -1.0 ≦ (C) ₁ +C ₂ )/(C ₁ -C ₂ )≤1.0。

25. The imaging lens of claim 1, wherein the fourth lens unit comprises at least one lens, and wherein the lens of the fourth lens unit closest to the object side has an abbe number V ₄ The imaging lens meets the following conditional expression: v is more than or equal to 50 ₄ ≤97。

26. The imaging lens according to claim 1, wherein an absolute value of a travel amount of the fifth lens unit on an optical axis at a time of a focusing operation of the imaging lens is D ₅ The imaging lens meets the following conditional expression: d is more than or equal to 0.2 ₅ /EFL≤0.4。

27. The imaging lens of claim 1, wherein the fifth lens unit has a focal length of F ₅ The imaging lens meets the following conditional expression: greater than or equal to 1 | F ₅ /EFL|≤3。

28. The imaging lens according to claim 1, characterized in that a photographing magnification of the imaging lens at infinity is 1:2 or more.

29. The imaging lens of claim 1, further comprising an iris diaphragm disposed between the third lens unit and the fourth lens unit.

30. The imaging lens according to claim 29, wherein an open f-number of the imaging lens when a diameter of the variable aperture reaches a maximum value in a state where an object at infinity is clearly imaged to an imaging plane is Fno, and the imaging lens satisfies the following conditional expression: 32 is more than or equal to Fno more than or equal to 2.

31. The imaging lens unit according to claim 29, wherein the fourth lens unit and the fifth lens unit are ganged lens units, wherein a first air interval is provided between an object-side surface of the fourth lens unit and the variable aperture stop, wherein a second air interval is provided between an image-side surface of the fourth lens unit and an object-side surface of the fifth lens unit, wherein a third air interval is provided between an image-side surface of the fifth lens unit and an object-side surface of the sixth lens unit, and wherein a sum of the first air interval, the second air interval, and the third air interval is constant.

32. The imaging lens according to claim 1, characterized by comprising a first housing portion in which the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the fifth lens unit, and the sixth lens unit are mounted.

33. The imaging lens according to claim 1, further comprising a seventh lens unit located on a side of the first lens unit close to an object side surface, the imaging lens having a shooting magnification of 1:1 at a close distance.

34. The imaging lens system of claim 33, wherein the seventh lens element includes, in order from an object side to an image side, a thirteenth lens element with positive refractive power, a fourteenth lens element with negative refractive power and a fifteenth lens element with positive refractive power, and a distance from an object side vertex of a first lens element with refractive power in a direction from the object side to the image side of the imaging lens system in any focusing state to an image plane is a distance from the object side vertex of the thirteenth lens element in any focusing state to the image plane.

35. The imaging lens system of claim 34, wherein the fourteenth lens has a focal length of F _s The imaging lens meets the following conditional expression: i F _s /EFL|≥0.4。

36. The imaging lens system according to claim 33, comprising a first housing portion and a second housing portion, the second housing portion being detachably mounted to a side of the first housing portion close to an object side;

the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the fifth lens unit, and the sixth lens unit are all mounted in the first housing portion, and the seventh lens unit is mounted in the second housing portion.

37. The imaging lens according to claim 1, further comprising an eighth lens unit located on a side of the sixth lens unit close to an image side surface, wherein a shooting magnification of the imaging lens at a close distance is 1: 1.

38. The imaging lens assembly of claim 37, wherein the eighth lens unit comprises a sixteenth lens element with negative refractive power, a seventeenth lens element with positive refractive power and an eighteenth lens element with negative refractive power in sequence from the object side to the image side.

39. The imaging lens of claim 38, wherein the seventeenth lens has a focal length of F _t The imaging lens meets the following conditional expression: i F _t /EFL|≥0.4。

40. An imaging lens according to claim 37, comprising a first housing portion and a third housing portion, the third housing portion being detachably mounted to a side of the first housing portion close to the image side surface;

the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, the fifth lens unit, and the sixth lens unit are all mounted in the first housing portion, and the eighth lens unit is mounted in the third housing portion.

41. An imaging device is characterized by comprising an electronic photosensitive element and an imaging lens, wherein the electronic photosensitive element is arranged on an imaging surface of the imaging lens;

the imaging lens comprises a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit and a sixth lens unit in sequence from an object side to an image side;

42. The imaging apparatus of claim 41, wherein a distance from an object side vertex of a first lens unit with refractive power in a direction from an object side to an image side of the imaging lens in an arbitrary focusing state to an imaging plane is TTL, a total focal length of the imaging lens in a state where an object at infinity is clearly imaged to the imaging plane is EFL, and the imaging lens satisfies the following conditional expressions: TTL/EFL is more than or equal to 1 and less than or equal to 2.

43. The imaging apparatus of claim 41, wherein the first lens element comprises a first lens element with positive refractive power, and a distance from a vertex of an object side surface of a first lens element with refractive power along an object-side to image-side direction to an image plane of the imaging lens in any focusing state is a distance from the vertex of the object side surface of the first lens element in any focusing state to the image plane.

44. The imaging apparatus of claim 43, wherein the object side surface of the first lens is convex.

45. The imaging device of claim 41, wherein the second lens element comprises, in order from the object side to the image side, a second lens element with positive refractive power, a third lens element with negative refractive power and a fourth lens element with positive refractive power.

46. The imaging device of claim 45, wherein the second lens element has a convex object-side surface and a convex image-side surface.

47. The imaging apparatus of claim 45, wherein the third lens has a concave object-side surface and a concave image-side surface.

48. The imaging apparatus of claim 45, wherein the object side surface of the fourth lens is convex.

49. The imaging device of claim 41, wherein the third lens unit comprises a fifth lens element with positive refractive power and a sixth lens element with negative refractive power in order from the object side to the image side.

50. The imaging device of claim 49, wherein an image side surface of the fifth lens element is convex.

51. The imaging device of claim 49, wherein an object side surface of the sixth lens element is concave and an image side surface is concave.

52. The imaging device of claim 41, wherein the fourth lens unit comprises a seventh lens element with positive refractive power.

53. The imaging device of claim 41, wherein the fifth lens unit comprises, in order from the object side to the image side, an eighth lens element with negative refractive power and a ninth lens element with positive refractive power.

54. The imaging device of claim 53, wherein an object side surface of the eighth lens element is convex and an image side surface of the eighth lens element is concave.

55. The imaging apparatus of claim 53, wherein an object side surface of the ninth lens is convex.

56. The imaging device of claim 41, wherein the sixth lens unit comprises, in order from the object side to the image side, a tenth lens element with positive refractive power, an eleventh lens element with negative refractive power and a twelfth lens element with negative refractive power.

57. The imaging device of claim 56, wherein an image side surface of the tenth lens is convex.

58. The imaging apparatus of claim 56, wherein an object side surface of the eleventh lens is concave.

59. The imaging device of claim 56, wherein an image side surface of the twelfth lens element is convex.

60. An imaging device in accordance with claim 41,wherein an absolute value of a travel amount of the second lens unit on the optical axis at the time of a focusing operation of the imaging lens is D ₂ The imaging lens meets the following conditional expression: d is more than or equal to 0.05 ₂ /EFL≤0.4。

61. The imaging device of claim 41, wherein the second lens unit has a focal length of F ₂ The imaging lens meets the following conditional expression: absolute F of 0.4 ≤ ₂ /EFL|≤3。

62. The imaging apparatus of claim 41, wherein the second lens unit comprises at least one lens, and wherein a lens of the second lens unit closest to the object side surface has an Abbe number V ₂ The imaging lens meets the following conditional expression: v is more than or equal to 65 ₂ ≤97。

63. The imaging apparatus according to claim 41, wherein an absolute value of a travel amount of the fourth lens unit on the optical axis at the time of a focusing operation by the imaging lens is D ₄ The imaging lens meets the following conditional expression: d is more than or equal to 0.075 ₄ /EFL≤0.3。

64. The imaging apparatus of claim 41, wherein the fourth lens unit has a focal length F ₄ The imaging lens meets the following conditional expression: 0.3 ≤ F ₄ /EFL|≤1.5。

65. The imaging apparatus of claim 41, wherein the fourth lens unit has a surface closest to the object side with a curvature C ₁ The surface curvature of the fourth lens unit closest to the image side surface is C ₂ The imaging lens meets the following conditional expression: -1.0 ≦ (C) ₁ +C ₂ )/(C ₁ -C ₂ )≤1.0。

66. An imaging apparatus according to claim 41, wherein the image forming apparatus is a digital image forming apparatusThe fourth lens unit comprises at least one lens, and the lens closest to the object side surface in the fourth lens unit has an abbe number V ₄ The imaging lens meets the following conditional expression: v is more than or equal to 50 ₄ ≤97。

67. The imaging apparatus according to claim 41, wherein an absolute value of a travel amount of the fifth lens unit on the optical axis at the time of a focusing operation by the imaging lens is D ₅ The imaging lens meets the following conditional expression: d is more than or equal to 0.2 ₅ /EFL≤0.4。

68. The imaging apparatus of claim 41, wherein the fifth lens unit has a focal length F ₅ The imaging lens meets the following conditional expression: greater than or equal to 1 | F ₅ /EFL|≤3。

69. The imaging apparatus according to claim 41, wherein a photographing magnification of the imaging lens at infinity is 1:2 or more.

70. An imaging apparatus according to claim 41, further comprising an iris diaphragm disposed between the third lens unit and the fourth lens unit.

71. The imaging apparatus according to claim 70, wherein an open f-number of the imaging lens when a diameter of the variable aperture reaches a maximum value in a state where an object at infinity is clearly imaged to an imaging plane is Fno, the imaging lens satisfying the following conditional expression: fno is more than or equal to 32 and more than or equal to 2.

72. The imaging device of claim 70, wherein the fourth lens unit and the fifth lens unit are ganged lens units, wherein an object-side surface of the fourth lens unit has a first air gap with the variable aperture stop, wherein an image-side surface of the fourth lens unit has a second air gap with the object-side surface of the fifth lens unit, wherein an image-side surface of the fifth lens unit has a third air gap with the object-side surface of the sixth lens unit, and wherein a sum of the first air gap, the second air gap, and the third air gap is constant.

73. An imaging device according to claim 41, comprising a first housing portion, the first, second, third, fourth, fifth and sixth lens units each being mounted within the first housing portion.

74. The imaging apparatus according to claim 41, further comprising a seventh lens unit located on a side of the first lens unit close to an object side surface, wherein a photographing magnification of the imaging lens at a close distance is 1: 1.

75. The imaging device of claim 74, wherein the seventh lens element comprises, in order from an object side to an image side, a thirteenth lens element with positive refractive power, a fourteenth lens element with negative refractive power and a fifteenth lens element with positive refractive power, and a distance from an object side vertex of a first lens element with refractive power in a direction from the object side to the image side of the imaging lens in any focusing state is a distance from the object side vertex of the thirteenth lens element in any focusing state to the imaging plane.

76. The imaging apparatus of claim 75, wherein the fourteenth lens has a focal length F _s The imaging lens meets the following conditional expression: i F _s /EFL|≥0.4。

77. An image forming apparatus according to claim 74, comprising a first housing portion and a second housing portion, said second housing portion being detachably mounted to a side of said first housing portion adjacent to the object side;

78. The imaging apparatus according to claim 41, further comprising an eighth lens unit on a side of the sixth lens unit close to an image side surface, wherein a shooting magnification of the imaging lens at a close distance is 1: 1.

79. The imaging device of claim 78, wherein the eighth lens unit comprises, in order from the object side to the image side, a sixteenth lens element with negative refractive power, a seventeenth lens element with positive refractive power and an eighteenth lens element with negative refractive power.

80. The imaging device of claim 79, wherein the seventeenth lens has a focal length F _t The imaging lens meets the following conditional expression: i F _t /EFL|≥0.4。

81. An image forming apparatus according to claim 78, comprising a first housing portion and a third housing portion, said third housing portion being detachably mounted to a side of said first housing portion adjacent to the image side;

82. An electronic device is characterized by comprising a device body and an imaging device, wherein the imaging device is arranged on the device body; the imaging device comprises an electronic photosensitive element and an imaging lens, wherein the electronic photosensitive element is arranged on an imaging surface of the imaging lens;

83. The electronic device of claim 82, wherein a distance from an object-side vertex of a first lens unit with refractive power to an image plane in a direction from an object side to the image side of the imaging lens in any focusing state is TTL, a total focal length of the imaging lens in a state of clearly imaging an object at infinity to the image plane is EFL, and the imaging lens satisfies the following conditional expressions: TTL/EFL is more than or equal to 1 and less than or equal to 2.

84. The electronic device of claim 82, wherein the first lens element comprises a first lens element with positive refractive power, and a distance from an object-side vertex of a first lens element with refractive power to an image plane along an object-side to image-side direction in any focusing state of the imaging lens is a distance from the object-side vertex of the first lens element to the image plane in any focusing state.

85. The electronic device of claim 84, wherein an object side surface of the first lens is convex.

86. The electronic device of claim 82, wherein the second lens element comprises, in order from an object side to an image side, a second lens element with positive refractive power, a third lens element with negative refractive power and a fourth lens element with positive refractive power.

87. The electronic device of claim 86, wherein an object-side surface and an image-side surface of the second lens element are convex.

88. The electronic device of claim 86, wherein an object-side surface of the third lens is concave and an image-side surface of the third lens is concave.

89. The electronic device of claim 86, wherein an object side surface of the fourth lens is convex.

90. The electronic device of claim 82, wherein the third lens element comprises, in order from an object side to an image side, a fifth lens element with positive refractive power and a sixth lens element with negative refractive power.

91. The electronic device of claim 90, wherein an image side surface of the fifth lens element is convex.

92. The electronic device of claim 90, wherein an object-side surface of the sixth lens element is concave and an image-side surface of the sixth lens element is concave.

93. The electronic device of claim 82, wherein the fourth lens unit comprises a seventh lens element with positive refractive power.

94. The electronic device of claim 82, wherein the fifth lens element comprises, in order from the object side to the image side, an eighth lens element with negative refractive power and a ninth lens element with positive refractive power.

95. The electronic device of claim 94, wherein an object-side surface of the eighth lens element is convex and an image-side surface of the eighth lens element is concave.

96. The electronic device of claim 94, wherein an object side surface of the ninth lens is convex.

97. The electronic device of claim 82, wherein the sixth lens element comprises, in order from the object side to the image side, a tenth lens element with positive refractive power, an eleventh lens element with negative refractive power and a twelfth lens element with negative refractive power.

98. The electronic device of claim 97, wherein an image side surface of the tenth lens is convex.

99. The electronic device of claim 97, wherein an object-side surface of the eleventh lens is concave.

100. The electronic device of claim 97, wherein an image side surface of the twelfth lens element is convex.

101. The electronic apparatus according to claim 82, wherein an absolute value of a travel amount of the second lens unit on an optical axis when the imaging lens performs a focusing operation is D ₂ The imaging lens meets the following conditional expression: d is more than or equal to 0.05 ₂ /EFL≤0.4。

102. The electronic device of claim 82, wherein the second lens unit has a focal length F ₂ The imaging lens satisfiesThe following conditional formula: absolute F of 0.4 ≤ ₂ /EFL|≤3。

103. The electronic device of claim 82, wherein the second lens unit comprises at least one lens, and wherein a lens of the second lens unit closest to the object-side surface has an Abbe number Vn ₂ The imaging lens meets the following conditional expression: v is more than or equal to 65 ₂ ≤97。

104. The electronic apparatus according to claim 82, wherein an absolute value of a travel amount of the fourth lens unit on an optical axis when the imaging lens performs a focusing operation is D ₄ The imaging lens meets the following conditional expression: d is not less than 0.075 ₄ /EFL≤0.3。

105. The electronic device of claim 82, wherein the fourth lens unit has a focal length F ₄ The imaging lens meets the following conditional expression: 0.3 ≤ F ₄ /EFL|≤1.5。

106. The electronic device of claim 82, wherein a surface curvature of the fourth lens unit closest to the object side is C ₁ The surface curvature of the fourth lens unit closest to the image side surface is C ₂ The imaging lens meets the following conditional expression: -1.0 ≦ (C) ₁ +C ₂ )/(C ₁ -C ₂ )≤1.0。

107. The electronic device of claim 82, wherein the fourth lens unit comprises at least one lens, and wherein a lens of the fourth lens unit closest to the object-side surface has an Abbe number Vn ₄ The imaging lens meets the following conditional expression: v is more than or equal to 50 ₄ ≤97。

108. The electronic device according to claim 82, wherein the fifth lens unit is optically active when the imaging lens performs a focusing operationThe absolute value of the amount of travel on the shaft being D ₅ The imaging lens meets the following conditional expression: d is more than or equal to 0.2 ₅ /EFL≤0.4。

109. The electronic device of claim 82, wherein the fifth lens unit has a focal length F ₅ The imaging lens meets the following conditional expression: greater than or equal to 1 | F ₅ /EFL|≤3。

110. The electronic device according to claim 82, wherein a shooting magnification of the imaging lens at infinity is 1:2 or more.

111. The electronic device according to claim 82, further comprising an iris diaphragm disposed between the third lens unit and the fourth lens unit.

112. The electronic device according to claim 111, wherein an open f-number of the imaging lens when a diameter of the iris diaphragm reaches a maximum value in a state where an object at infinity is clearly imaged to an imaging plane is Fno, and the imaging lens satisfies the following conditional expression: fno is more than or equal to 32 and more than or equal to 2.

113. The electronic device of claim 111, wherein the fourth lens unit and the fifth lens unit are ganged lens units, wherein an object-side surface of the fourth lens unit has a first air gap with the iris, wherein an image-side surface of the fourth lens unit has a second air gap with the object-side surface of the fifth lens unit, wherein an image-side surface of the fifth lens unit has a third air gap with the object-side surface of the sixth lens unit, and wherein a sum of the first air gap, the second air gap, and the third air gap is constant.

114. The electronic device of claim 82, comprising a first housing portion, the first, second, third, fourth, fifth, and sixth lens units each mounted within the first housing portion.

115. The electronic device according to claim 82, further comprising a seventh lens unit located on a side of the first lens unit close to an object side, wherein a photographing magnification of the imaging lens at a close distance is 1: 1.

116. The electronic device of claim 115, wherein the seventh lens element comprises, in order from an object side to an image side, a thirteenth lens element with positive refractive power, a fourteenth lens element with negative refractive power and a fifteenth lens element with positive refractive power, and a distance from an object side vertex of a first lens element with refractive power in a direction from the object side to the image side of the imaging lens in any focusing state is a distance from the object side vertex of the thirteenth lens element in any focusing state to the imaging plane.

117. The electronic device of claim 116, wherein the fourteenth lens has a focal length of F _s The imaging lens meets the following conditional expression: i F _s /EFL|≥0.4。

118. The electronic device of claim 115, comprising a first housing portion and a second housing portion, the second housing portion being removably mounted to the first housing portion on a side thereof adjacent the object side;

119. The electronic device according to claim 82, further comprising an eighth lens unit on a side of the sixth lens unit close to an image side surface, wherein a photographing magnification of the imaging lens at a close distance is 1: 1.

120. The electronic device of claim 119, wherein the eighth lens unit comprises, in order from the object side to the image side, a sixteenth lens element with negative refractive power, a seventeenth lens element with positive refractive power and an eighteenth lens element with negative refractive power.

121. The electronic device of claim 120, wherein the seventeenth lens has a focal length F _t The imaging lens meets the following conditional expression: i F _t /EFL|≥0.4。

122. The electronic device of claim 119 comprising a first housing portion and a third housing portion, the third housing portion being removably mounted to the first housing portion on a side thereof adjacent the image side;