CN116088154A

CN116088154A - Zoom lens, lens module and electronic equipment

Info

Publication number: CN116088154A
Application number: CN202111275212.7A
Authority: CN
Inventors: 陈超; 余洋华; 武斌
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2023-05-09

Abstract

The application discloses zoom, camera lens module and electronic equipment includes: the first lens group with positive focal power and the second lens group with negative focal power are sequentially arranged from the object side to the image side; when the zoom lens zooms from a short focal end state to a long focal end state, the first lens group and the second lens group move to the object side along the optical axis, and the distance between the first lens group and the second lens group is gradually reduced; the first lens group includes: the lens system comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with focal power and a fourth lens with positive focal power, which are sequentially arranged from an object side to an image side. According to the zoom lens, continuous zooming is realized through the single lens, so that the imaging definition of the zoom lens can be always kept at a better level; the layout of the single lens is also convenient for the structural optimization of the electronic equipment, and can better meet the design requirement of miniaturization.

Description

Zoom lens, lens module and electronic equipment

Technical Field

The present application relates to the field of zoom lenses, and more particularly, to a zoom lens, a lens module, and an electronic apparatus.

Background

In recent years, electronic devices (such as digital cameras, smart phones, notebook computers, tablet computers, etc.) equipped with imaging lenses are rapidly developing and spreading, and new requirements are also being put on the performance of imaging lenses by the electronic devices.

At present, the high-power zoom of the imaging lens of the electronic equipment in the market is basically 'jump' zoom, namely, the hybrid optical zoom is realized by carrying two to a plurality of lenses with different focal lengths and matching with digital zoom based on an algorithm.

However, the "jump" zoom is based on a plurality of imaging lenses of different focal lengths, and continuous zoom is realized by means of arithmetic processing, not continuous zoom in a true sense. In the zooming process, the imaging definition of focal length transition parts of a plurality of imaging lenses is reduced compared with continuous optical zooming, so that the imaging quality is affected; meanwhile, the mounting of a plurality of photographing lenses not only results in complex manufacturing process, but also cannot be well adapted to handheld mobile electronic devices with strong miniaturization requirements.

In summary, how to reduce the number of imaging lenses, and simultaneously have a large zoom ratio and good imaging quality is one of the problems to be solved in the current industry.

Disclosure of Invention

The application provides a zoom lens, can realize the effect of big zoom ratio and better image quality through single camera lens. In addition, the application also provides a lens module applying the zoom lens and electronic equipment applying the lens module.

In a first aspect, there is provided a zoom lens including:

the first lens group with positive focal power and the second lens group with negative focal power are sequentially arranged from the object side to the image side;

when the zoom lens zooms from a short focal end state to a long focal end state, the first lens group and the second lens group move to the object side along the optical axis, and the distance between the first lens group and the second lens group is gradually reduced;

the first lens group includes: the lens system comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with focal power and a fourth lens with positive focal power, which are sequentially arranged from an object side to an image side. The optical power of the first lens, the second lens, the third lens and the fourth lens is reasonably distributed, so that the first lens group can have positive optical power.

The zoom lens mainly uses the refraction principle of the lens to image, light rays are deflected after passing through the zoom lens, a clear image is formed on a focusing plane, and the image of a scene is recorded through an electronic photosensitive element positioned on the focusing plane. The zoom lens comprises a first lens group and a second lens group which are sequentially arranged from an object side to an image side, wherein the first lens group is a focusing lens group with positive focal power and can converge light rays to compress the light beam caliber entering the zoom lens, and the first lens group can move along the optical axis of the zoom lens to change the focal length of the zoom lens, so that the zoom lens can realize continuous zooming; the second lens group is a compensation lens group with negative focal power, and can also move along the optical axis of the zoom lens to balance and eliminate the aberration influence generated in the moving process of the first lens group, so that the focus of the zoom lens is located on the focusing plane of the electronic photosensitive element, and good imaging quality can be ensured while the large zoom ratio of the zoom lens is met.

Compared with the 'jump' zoom lens in the prior art, the zoom lens provided by the application does not have a focal length transition part of multiple lenses, and the imaging quality problem of the focal length transition part is avoided, so that the imaging definition of the zoom lens can be always kept at a better level; meanwhile, the layout of a single lens is convenient for the structural optimization of the electronic equipment, and the miniaturized design requirement of the electronic equipment can be well met.

Alternatively, the first lens group and the second lens group are assembled through a lens barrel.

Alternatively, the first lens group and the second lens group are driven by a motor. Specifically, the first lens group is mounted on a first motor, and the first motor is used for driving the first lens group to move along the optical axis; the second lens group is installed on a second motor, and the second motor is used for driving the second lens group to move along the optical axis.

Optionally, the first lens group and the second lens group comprise a total number of lenses of 7-12 sheets. For example: the first lens group consists of 4 lenses, the second lens group consists of 3 lenses, and the total number is 7; the first lens group consisted of 4 lenses and the second lens group consisted of 7 lenses, and the total number was 11.

The zoom lens may further include an aperture stop, which may be disposed on an object side of the first lens in the first lens group, or on any one of the lenses in the first lens group.

Optionally, the zoom lens further includes an infrared cut filter disposed on an image side of the fourth lens in the second lens group.

Alternatively, the lenses in the first lens group and the second lens group may be made of plastic or glass.

Alternatively, the lenses in the first lens group and the second lens group may be made of other materials capable of meeting the refractive index requirement, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix.

In one possible design, the zoom lens satisfies the following relation:

0.5<f _G1 /fw<0.8。

wherein f _G1 And fw is the focal length of the zoom lens in a short focal length state.

The relation formula prescribes a ratio range of the focal length of the first lens group to the focal length of the zoom lens in a short focal end state, and when the ratio range is smaller than 0.8, the axial space length of the first lens group can be limited, so that the optical total length of the zoom lens is favorably compressed to realize miniaturization of a module structure; when the ratio range is more than 0.5, the zoom lens can be favorable for keeping better imaging quality. Therefore, the limiting conditions are combined, and the size of the zoom lens can be made smaller on the premise of ensuring the imaging quality of the zoom lens, so that the zoom lens can be better adapted to miniaturized handheld mobile electronic equipment.

In one possible design, the zoom lens satisfies the following relation:

TTLt/ft<1.0；

wherein TTLt is the total optical length of the zoom lens in the state of the long focal length end, and ft is the focal length of the zoom lens in the state of the long focal length end.

The above relation specifies the ratio range of the focal length of the first lens group to the focal length of the zoom lens in the short focal length state, so that the zoom lens can limit the total optical length of the zoom lens while meeting the long focal length characteristic, thereby realizing the miniaturization of the module, and being beneficial to scaling in equal proportion under the condition that the zoom lens architecture is the same.

In one possible design, the object side surface of the first lens element is convex, and the image side surface of the fourth lens element is convex.

The above definition further defines a plane structure of the object side surface of the first lens element and the image side surface of the fourth lens element in the first lens group, wherein the object side surface of the first lens element in the first lens group is convex, which is favorable for reducing spherical aberration, and the image side surface of the fourth lens element in the first lens group is convex, which can effectively reduce spherical aberration and distortion, thereby improving the imaging quality of the zoom lens; meanwhile, the design can improve the light converging capacity of the first lens group, and can prolong the back focal length of the zoom lens, so that the zoom lens has a good imaging effect and simultaneously reduces the total optical length of the zoom lens as much as possible, and the purpose of miniaturization is achieved.

In one possible design, the zoom lens satisfies the following relation:

FNOt<5；

wherein FNot is the aperture value of the zoom lens in the telephoto end state.

The above relation specifies the aperture value range of the zoom lens in the state of the long focal point, which can make the zoom lens favorable to display high resolution in the short focal point, and simultaneously make the lens have large light flux, improve imaging performance, and achieve clear imaging effect even if shooting in a darker environment.

In one possible design, the zoom lens satisfies the following relation:

ft/fw<1.6。

the above relation specifies a ratio range of a focal length of the zoom lens in a long focal length state to a focal length of the zoom lens in a short focal length state, that is, a zoom ratio of less than 1.6. Under the requirement of meeting the zoom ratio, the optical structure of the zoom lens is simpler, continuous zooming can be easily realized through the two lens groups, and further miniaturization of the module is facilitated, and good imaging quality is achieved.

In one possible design, the zoom lens satisfies the following relation:

TTLt/Imgh<5.5；

wherein Imgh is half of the diagonal length of the pixel region of the electron-sensitive element on the focal plane.

The above relation specifies the ratio range of the total optical length of the zoom lens in the long focal end state to half of the diagonal length of the pixel area of the electronic photosensitive element on the focusing plane, and limits the total optical length of the zoom lens when ensuring the zoom lens to have high-pixel images, thereby being beneficial to reducing the whole size well to realize miniaturization and simultaneously giving consideration to good imaging quality.

In one possible design, the zoom lens satisfies the following relation:

TT _1-n /TTLt<0.4；

wherein TT _1-n Is the sum of the thicknesses of all lenses in the first lens group and the second lens group on the optical axis.

The above relation specifies the ratio range of the sum of the thicknesses of all lenses in the first lens group and the second lens group on the optical axis to the total optical length of the zoom lens in the long focal length state, and limits the thicknesses of all lenses in the first lens group and the second lens group, thereby being beneficial to the processing and manufacturing of the zoom lens, simultaneously being beneficial to realizing a large zoom ratio and having better zoom effect. The ratio range can better balance the zooming performance and the manufacturability of processing and manufacturing.

In one possible design, the zoom lens satisfies the following relation:

0.6<f _G1 /f ₁ <1.2；

wherein f ₁ Is the focal length of the first lens.

The above relation specifies the ratio range of the focal length of the first lens group to the focal length of the first lens in the first lens group, and when the ratio range is satisfied, the optical power of the lens is reasonably distributed, and tolerance sensitivity caused by local concentration of the optical power in the lens group is avoided, so that the processing and manufacturing difficulty is reduced, and the yield is improved.

In one possible design, the zoom lens satisfies the following relation:

0.6<f _G1 /f ₄ <1.2；

wherein f ₄ Is the focal length of the fourth lens.

The ratio range of the focal length of the first lens group to the focal length of the fourth lens in the first lens group is regulated in the relational expression, when the ratio range is met, the focal power of the lenses is reasonably distributed, tolerance sensitivity caused by local concentration of the focal power in the lens group is avoided, processing and manufacturing difficulty is reduced, and yield is improved.

In one possible design, the second lens group includes: the image-side lens assembly comprises a fifth lens with optical power, a sixth lens with optical power, a seventh lens with negative optical power and an eighth lens with optical power, which are sequentially arranged from an object side to an image side. The optical power of the fifth lens, the sixth lens, the seventh lens and the eighth lens are reasonably distributed, so that the second lens group can have negative optical power.

Optionally, the fifth lens, sixth lens, seventh lens, and eighth lens may also distribute optical power in other ways, which is not limited in this application.

In a second aspect, the present application further provides a lens module, including a reflecting member, an electronic photosensitive element, and the zoom lens described above, where the reflecting member is located on an object side of the zoom lens and is configured to deflect light to the zoom lens, the electronic photosensitive element is located on an image side of the zoom lens, and the zoom lens is configured to image light to the electronic photosensitive element.

Optionally, the reflecting member is a prism or a mirror.

Alternatively, the reflecting surface of the reflecting mirror may be a metal reflecting film layer prepared by an evaporation method or a sputtering method, and the metal may be nickel, aluminum, silver, gold, or the like, or an alloy thereof.

The reflecting piece can change the propagation direction of light, so that the optical axis direction of the zoom lens can be different from the direction of external light entering the electronic equipment, and further the arrangement position and the angle of the zoom lens are more flexible, for example, the optical axis direction of the zoom lens can be parallel to a display screen of the electronic equipment, and therefore the size requirement on the accommodating space in the thickness direction of the electronic equipment can be reduced.

In addition, because the lens module adopts the zoom lens, the lens module also has the advantages of large zoom ratio, excellent imaging quality, miniaturization, easy processing and manufacturing, high yield and the like corresponding to the zoom lens.

In a third aspect, the present application further provides an electronic device, including a processor and the lens module described above, where the lens module is configured to acquire image data and input the image data to the processor, and the processor is configured to process the image data.

Optionally, the electronic device further includes a housing and a display screen, the display screen is mounted on the housing, a containing space is formed in the housing, the lens module can be mounted in the containing space, the display screen is electrically connected with the processor, and the display screen can display pictures or videos processed by the processor.

The lens module has the advantage of miniaturization, and the size requirement on the accommodating space is low, so that the thickness of the shell can be reduced to realize the light and thin electronic equipment; or, on the premise of not changing the thickness of the shell, the accommodation space saved by the lens module can be reserved for other functional elements.

Optionally, other devices may be included in the housing, such as, but not limited to, a battery, a flashlight, a fingerprint recognition module, a headset, a circuit board, a sensor, and the like.

Alternatively, the electronic device may be a terminal device with a camera or photographing function, such as a mobile phone, a tablet computer, a laptop computer, a video camera, a video recorder, a camera, a smart robot, or other forms of devices with a camera or photographing function.

Drawings

Fig. 1 is a schematic view of an example of a zoom lens according to an embodiment of the present application;

FIG. 2 is a schematic view of an astigmatic field curve of the zoom lens of the embodiment of FIG. 1;

FIG. 3 is a schematic view of a distortion curve of the zoom lens of the embodiment of FIG. 1;

fig. 4 is a schematic view of another example of a zoom lens according to an embodiment of the present application;

FIG. 5 is an astigmatic field curve diagram of the zoom lens according to the embodiment of FIG. 4;

FIG. 6 is a schematic diagram of a distortion curve of the zoom lens of the embodiment of FIG. 4;

Fig. 7 is a schematic view of another example of a zoom lens according to an embodiment of the present application;

FIG. 8 is an astigmatic field curve diagram of the zoom lens of the embodiment of FIG. 7;

FIG. 9 is a schematic diagram of a distortion curve of the zoom lens of the embodiment of FIG. 7;

FIG. 10 is a schematic view of another example of a zoom lens according to an embodiment of the present disclosure;

FIG. 11 is an astigmatic field curve diagram of the zoom lens of the embodiment of FIG. 10;

FIG. 12 is a schematic view of a distortion curve of the zoom lens of the embodiment of FIG. 10;

fig. 13 is a schematic view of another example of a zoom lens provided in an embodiment of the present application;

FIG. 14 is an astigmatic field curve diagram of the zoom lens of the embodiment of FIG. 13;

FIG. 15 is a schematic view of a distortion curve of the zoom lens of the embodiment of FIG. 13;

FIG. 16 is a schematic view of another example of a zoom lens according to an embodiment of the present disclosure;

FIG. 17 is an astigmatic field curve diagram of the zoom lens of the embodiment of FIG. 16;

FIG. 18 is a schematic view of a distortion curve of the zoom lens of the embodiment of FIG. 16;

fig. 19 is a schematic view of an example of a lens module according to an embodiment of the present disclosure;

fig. 20 is a schematic diagram of another example of a lens module according to an embodiment of the present disclosure;

fig. 21 is a schematic diagram of an electronic device provided in an embodiment of the present application.

Reference numerals: 10. a first lens group; 11. a first lens; 12. a second lens; 13. a third lens; 14. a fourth lens; 20. a second lens group; 25. a fifth lens; 26. a sixth lens; 27. a seventh lens; 28. an eighth lens; 30. an aperture stop; 40. an infrared cut-off filter; 50. an electron sensitive element; 60. a reflecting member; 100. a lens module; 200. a housing; 300. and a display screen.

Detailed Description

The following is an exemplary description of relevant content that may be relevant to embodiments of the present application.

For ease of understanding, the technical terms referred to in the present application are explained and described below.

Focal length (focal length), also known as focal length, is a measure of the concentration or divergence of light in an optical system, and refers to the perpendicular distance from the optical center of a lens or lens group to the focal plane when an infinitely distant scene is brought into clear images at the focal plane by the lens or lens group. From a practical point of view it is understood that the distance from the center of the lens to the film plane. For a fixed focus lens, the position of the optical center is fixed; for a zoom lens, a change in the optical center of the lens brings about a change in the focal length of the lens.

The aperture is a device for controlling the quantity of light transmitted through the lens and entering the photosensitive surface of the body, and is usually arranged in the lens. The expressed aperture size is expressed in terms of F/number.

The aperture value is a relative value (reciprocal of relative aperture) obtained from the focal length of the lens and the lens light-passing diameter. The smaller the aperture value, the more the amount of light is entered in the same unit time. The larger the aperture value, the smaller the depth of field, and the background content of the photo will be blurred, similar to the effect of a long focal length lens.

Focal power (focal power): equal to the difference between the image Fang Guangshu convergence and the object beam convergence, which characterizes the ability of the optical system to deflect light. Common letters with focal power

Indicating refractive sphere power +.>

Wherein n 'is the refractive index of the image space, n is the refractive index of the object space, r is the spherical radius, f' is the image focal length, and f is the object focal length. The general optical power is expressed as the reciprocal of the focal length of the image space (approximately, the refractive index of air is regarded as 1). The above power equation is generic (no paraxial split) for any optical system.

The optical power characterizes the refractive power of the optical system to an incident parallel beam.

The larger the number of the parallel beams is, the more the parallel beams are folded;

When the refraction is convergent;

When the refraction is divergent. / >

And in the case of plane refraction. At this time, the beam is refracted and then still is a beam in the axial direction, and no refraction phenomenon occurs.

The optical total length (total track length, TTL), which refers to the total length from the barrel head to the imaging plane, is a major factor in forming the camera height.

Abbe number, the Abbe's number, is the ratio of the difference in refractive index of an optical material at different wavelengths, and represents the magnitude of the material's dispersion.

In the optical apparatus, a lens of the optical apparatus is taken as a vertex, and an included angle formed by two edges of a maximum range of an object image of a measured object can pass through the lens is called a field angle. The size of the angle of view determines the field of view of the optical instrument, and the larger the angle of view, the larger the field of view and the smaller the optical magnification.

The optical axis is a ray passing perpendicularly through the center of the ideal lens. When light parallel to the optical axis enters the convex lens, the ideal convex lens is a point where all light is converged behind the lens, and the point where all light is converged is the focal point.

Aperture refers to an edge, frame, or specially configured apertured barrier of an optical element in an optical train component used to limit the imaging beam size or imaging spatial unit.

The aperture stop is a stop limiting the maximum inclination angle of edge rays in an on-axis point imaging beam, i.e., a stop with the minimum incident aperture angle.

The entrance pupil is the common entrance of the light beam emitted from all points on the object plane.

The entrance pupil diameter is the effective aperture that limits the incident beam.

Aberration (aberration) refers to the deviation of the result of non-paraxial ray tracing from the ideal state of gaussian optics (first order approximation theory or paraxial rays) in an actual optical system, where the result of paraxial ray tracing does not coincide with the result of paraxial ray tracing. Aberrations are mainly classified into spherical aberration, coma, curvature of field, astigmatism, distortion, chromatic aberration, and wave aberration.

Distortion (distortion), also known as distortion, is the degree of distortion of an image of an object by an optical system relative to the object itself. The distortion is caused by the influence of the spherical aberration of the diaphragm, and the height of the intersection point of the chief rays with different fields of view and the Gaussian image plane after passing through the optical system is not equal to the ideal height, and the difference between the chief rays and the Gaussian image plane is the distortion. Therefore, the distortion only changes the imaging position of the off-axis object point on the ideal plane, so that the shape of the image is distorted, but the definition of the image is not affected.

The zoom ratio refers to the ratio of the longest focal length to the shortest focal length of the zoom lens.

The tele end of the zoom lens represents the numerical segment of the focal length of the zoom lens when the zoom lens is in a telescopic state.

The short focal end of the zoom lens represents the numerical segment of the focal length where the shot picture shows a large prospect and a small prospect when the zoom lens is in a wide-angle state.

The focusing group is a lens group which moves along the optical axis of the zoom lens in the zoom lens and is responsible for adjusting the focal length of the zoom lens.

The compensation group is a lens group which moves along the optical axis of the zoom lens along with the focusing group in the zoom lens and is responsible for balancing and eliminating the influence of aberration generated in the moving process of the focusing group.

The zoom lens is a camera lens capable of changing focal length within a certain range, thereby obtaining images with different sizes and different scenery ranges with different wide and narrow angles of view. The zoom lens can change the photographing range by varying the focal length without changing the photographing distance, and thus is very advantageous for picture composition. Because a zoom lens can play a role of a plurality of fixed focus lenses, the lens can be suitable for various shooting scenes, and when in use, a user not only reduces the number of lenses to be carried, but also saves the time for replacing the lenses.

At present, the high-power zoom of the imaging lens of the electronic equipment in the market is basically 'jump' zoom, namely, the hybrid optical zoom is realized by carrying two to a plurality of lenses with different focal lengths and matching with digital zoom based on an algorithm. In the zooming process, the imaging definition of focal length transition parts of a plurality of imaging lenses is reduced compared with continuous optical zooming, so that the imaging quality is affected; meanwhile, the mounting of a plurality of photographing lenses not only results in complex manufacturing process, but also cannot be well adapted to handheld mobile electronic devices with strong miniaturization requirements.

Based on the above problems, the application provides a zoom lens, which can realize the effects of large zoom ratio and better imaging quality through a single lens, can reduce the layout quantity of the camera lens, and can be better applied to miniaturized handheld mobile electronic equipment.

For convenience of description, the left side of the zoom lens is defined as a subject side (hereinafter, may also be referred to as an object side), a surface of the lens facing the object side may be referred to as an object side, the object side may also be understood as a surface of the lens near the object side, the right side of the zoom lens is an image side (hereinafter, may also be referred to as an image side), a surface of the lens facing the image side may be referred to as an image side, and the image side may also be understood as a surface of the lens near the image side.

Fig. 1 is a schematic diagram of an example of a zoom lens according to an embodiment of the present application. Wherein (a) in fig. 1 shows a schematic view of the zoom lens at the short focal end; fig. 1 (b) shows a schematic view of the zoom lens at the telephoto end.

As shown in fig. 1, a zoom lens according to an embodiment of the present application includes: the first lens group 10 having positive optical power and the second lens group 20 having negative optical power are disposed in order from the object side to the image side.

When the zoom lens zooms from the short focal length state to the long focal length state, that is, in the state transition from (a) to (b) in fig. 1, the first lens group 10 and the second lens group 20 move along the optical axis toward the object side, and the distance between the first lens group 10 and the second lens group 20 gradually decreases.

The first lens group 10 has 4 lenses, each lens has a certain focal power, the focal powers of the lenses are reasonably distributed, so that the first lens group 10 has positive focal power, and the first lens group 10 has the capability of converging light rays; specifically, the first lens group 10 includes: a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having optical power, and a fourth lens 14 having positive optical power are disposed in this order from the object side to the image side.

The second lens group 20 is also formed by a plurality of lenses with certain focal power, the focal power of the plurality of lenses is reasonably distributed, so that the second lens group 20 has negative focal power, and the second lens group 20 has the capability of diverging light rays.

The zoom lens provided in this embodiment of the present application mainly uses the refraction principle of the lens to perform imaging, and the light beam is deflected after passing through the zoom lens, so as to form a clear image on the focal plane, and records the image of the scenery through the electronic photosensitive element 50 located on the focal plane. The zoom lens comprises a first lens group 10 and a second lens group 20 which are sequentially arranged from an object side to an image side, wherein the first lens group 10 is a focusing lens group with positive focal power, can converge light rays to compress the light beam caliber entering the zoom lens, and the first lens group 10 can move along the optical axis of the zoom lens to change the focal length of the zoom lens, so that the zoom lens can realize continuous zooming; the second lens group 20 is a compensation lens group having negative focal power, and can also move along the optical axis of the zoom lens to balance and eliminate the aberration influence generated by the first lens group 10 during the movement process, so that the focal point of the zoom lens falls on the focusing plane of the electronic photosensitive element 50, and good imaging quality can be ensured while meeting the requirement of a large zoom ratio of the zoom lens.

Compared with the 'jump' zoom lens in the prior art, the zoom lens provided by the embodiment of the application does not have a focal length transition part of multiple lenses, and the imaging quality problem of the focal length transition part is avoided, so that the imaging definition of the zoom lens can be always kept at a better level; meanwhile, the layout of a single lens is convenient for the structural optimization of the electronic equipment, and the miniaturized design requirement of the electronic equipment can be well met.

Alternatively, the first lens group 10 and the second lens group 20 are assembled through a lens barrel.

Alternatively, the first lens group 10 and the second lens group 20 are driven by a motor. Specifically, the first lens group 10 is mounted on a first motor for driving the first lens group 10 to move along the optical axis; the second lens group 20 is mounted on a second motor for driving the second lens group 20 to move along the optical axis.

Alternatively, the total number of lenses included in the first lens group 10 and the second lens group 20 is 7 to 12 sheets.

In some embodiments, the first lens group 10 is composed of 4 lenses, and the second lens group 20 is composed of 3 lenses, wherein the 3 lenses constituting the second lens group 20 have positive power, negative power and negative power, respectively, and the second lens group 20 has negative power as a whole by reasonable distribution of the powers of the 3 lenses.

In some embodiments, the first lens group 10 is composed of 4 lenses, and the second lens group 20 is composed of 6 lenses, wherein the 6 lenses constituting the second lens group 20 have positive power, negative power, positive power, negative power and negative power, respectively, and the power of the 6 lenses is reasonably distributed so that the second lens group 20 has negative power as a whole.

In some embodiments, the first lens group 10 is composed of 4 lenses, and the second lens group 20 is composed of 8 lenses, wherein the 8 lenses constituting the second lens group 20 have positive power, negative power, and positive power, respectively, and the power of the 8 lenses is reasonably distributed so that the second lens group 20 has negative power as a whole.

In some embodiments, the first lens group 10 and the second lens group 20 each include 4 lenses, and the total number is 8 lenses. In the

second lens group

20, 4 lenses are defined as a fifth lens element 25, a sixth lens element 26, a seventh lens element 27 and an eighth lens element 28, which are disposed in order from the object side to the image side.

As described above, each lens of the second lens group 20 also has a certain optical power, and the optical powers of the plurality of lenses are reasonably distributed, so that the second lens group 20 can have a negative optical power. Specifically, the fifth lens 25 has optical power, the sixth lens 26 has optical power, the seventh lens 27 has negative optical power, and the fourth lens 14 has optical power, so that the second lens group 20 having negative optical power is formed in combination.

Optionally, the zoom lens further includes an aperture stop 30, and the aperture stop 30 may be further disposed on the object side of the first lens group 10, or the aperture stop 30 may be disposed on any one of the lenses of the first lens group 10. The shape of the effective light-passing opening of the aperture stop 30 may be circular, the face of the effective light-passing opening may be perpendicular to the optical axis, and the center of the effective light-passing opening may be located on the optical axis. The aperture stop 30 may be made of any one of plastic, aluminum alloy, beryllium-aluminum alloy, titanium alloy, aluminum, beryllium, and the like.

The aperture stop 30 ensures a paraxial condition, improves imaging quality, improves imaging definition, controls the range of an imaging object space, and controls the brightness of an image plane. In the application, through the size adjustment of the aperture diaphragm 30, a larger entrance pupil diameter can be obtained, and under the condition that the focal length of the lens is fixed, a smaller aperture value can be obtained, namely, a larger aperture and a diffraction limit value can be obtained, so that the imaging quality of the zoom lens is improved.

Optionally, the zoom lens further includes an infrared cut filter 40, and the infrared cut filter 40 is disposed on the image side of the eighth lens 28.

The ir cut filter 40 can effectively block ir light interfering with imaging quality and maintain high transmission of visible light, so that the resulting image more accords with the optimal feeling of human eyes.

For easy understanding and description, the embodiments of the present application define the representation of the relevant parameters of the zoom lens, for example, f is used to represent the focal length of the zoom lens, f is used to _G1 The letter representation representing the combined focal length of the first lens group 10, etc., is merely schematic, but may of course be represented in other forms, without any limitation in this application.

In the following relation, the unit of the parameter related to the ratio is kept uniform, for example, the unit of the numerator is millimeter (mm), and the unit of the denominator is millimeter.

Further, the zoom lens satisfies the following relation:

0.5<f _G1 /fw<0.8。

wherein f _G1 The focal length fw of the first lens group 10 is the focal length of the zoom lens in the short focal length end state.

It should be understood that the zoom lens described above refers to a combination of the first lens group 10 and the second lens group 20. In addition, f _G1 Is the focal length of the first lens group 10, i.e., the combined focal length of the first lens 11 to the fourth lens 14 in the first lens group 10.

The above relation defines a ratio range of 0.5 of the focal length of the first lens group 10 to the focal length of the zoom lens in the short focal end state<f _G1 /fw<And 0.8, when the ratio range is smaller than 0.8, the axial space length of the first lens group 10 can be limited, the optical total length of the zoom lens can be reduced to achieve miniaturization of the module structure, and when the ratio range is larger than 0.5, the zoom lens can be favorable for maintaining better imaging quality. Therefore, the limiting conditions are combined, and the size of the zoom lens can be made smaller on the premise of ensuring the imaging quality of the zoom lens, so that the zoom lens can be better adapted to miniaturized handheld mobile electronic equipment.

Alternatively, the lenses in the first lens group 10 may be made of plastic or glass.

Alternatively, the lenses in the first lens group 10 may be made of other materials capable of meeting the refractive index requirement, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix.

Alternatively, the lenses in the second lens group 20 may be made of plastic or glass.

Alternatively, the lenses in the second lens group 20 may be made of other materials capable of meeting the refractive index requirement, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix.

In some embodiments, the zoom lens satisfies the following relationship:

TTLt/ft<1.0。

wherein TTLt is the total optical length of the zoom lens in the long focal length state, and ft is the focal length of the zoom lens in the long focal length state.

The above relation specifies that the ratio range TTLt/ft of the total optical length of the zoom lens in the long focal end state to the focal length of the zoom lens in the long focal end state is smaller than 1.0, so that the zoom lens can limit the total optical length of the zoom lens while meeting the long focal length characteristic, thereby realizing the miniaturization of the module, and being beneficial to scaling in equal proportion under the condition that the zoom lens architecture is the same.

Optionally, the object side surface of the first lens element 11 in the first lens assembly 10 is convex, and the image side surface of the fourth lens element 14 is convex.

The above definition further defines a plane structure of the object side surface of the first lens element 11 and the image side surface of the fourth lens element 14 in the first lens group 10, wherein the object side surface of the first lens element 11 in the first lens element 10 is convex, which is favorable for reducing spherical aberration, and the image side surface of the fourth lens element 14 in the first lens element 10 is convex, which can effectively reduce spherical aberration and distortion, thereby improving the imaging quality of the zoom lens, and meanwhile, the design can improve the light converging capability of the first lens element 10, prolong the back focal length of the zoom lens, so that the zoom lens has better imaging effect, and simultaneously, the optical total length of the zoom lens is reduced as much as possible, thereby achieving the purpose of miniaturization.

In some embodiments, the zoom lens satisfies the following relationship:

FNOt<5。

wherein FNot is the aperture value of the zoom lens in the telephoto end state.

The above relation specifies the aperture value range FNot <5 of the zoom lens in the state of the long focal end, which can make the zoom lens favorable for displaying high resolution in the short focal end, and simultaneously make the lens have large light quantity, improve imaging performance, and achieve clear imaging effect even if shooting is performed in a darker environment.

In some embodiments, the zoom lens satisfies the following relationship:

ft/fw<1.6。

ft is the focal length of the zoom lens in the telephoto end state, and fw is the focal length of the zoom lens in the short-focus end state.

The above relation specifies that the ratio range ft/fw of the focal length of the zoom lens in the long focal end state to the focal length of the zoom lens in the short focal end state is <1.6, that is, the zoom ratio is less than 1.6. Under the requirement of meeting the zoom ratio, the optical structure of the zoom lens is simpler, continuous zooming can be easily realized through the two lens groups, and further miniaturization of the module is facilitated, and good imaging quality is achieved.

In some embodiments, the zoom lens satisfies the following relationship:

TTLt/Imgh<5.5。

where TTLt is the total optical length of the zoom lens in the telephoto end state, and Imgh is half the diagonal length of the pixel region of the electronic photosensitive element 50 on the focal plane.

The above relation specifies that the ratio range TTLt/Imgh of the total optical length of the zoom lens in the long focal end state to half of the diagonal length of the pixel region of the electronic photosensitive element 50 on the focal plane is less than 5.5, and when the zoom lens has an image with high pixels, the total optical length of the zoom lens is limited, which is beneficial to reducing the whole size well to achieve miniaturization and simultaneously has good imaging quality.

In some embodiments, the zoom lens satisfies the following relationship:

TT _1-n /TTLt<0.4。

wherein TT _1-n The TTLt is the total optical length of the zoom lens in the telephoto end state, which is the sum of thicknesses of all lenses in the first lens group 10 and the second lens group 20 on the optical axis.

For example: the first lens group 10 and the second lens group 20 each include 4 lenses, TT _1-n Refers to the sum of thicknesses of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28 on the optical axis.

It should be noted that TT _1-n Excluding the gap between adjacent two lenses.

The above relation defines the sum of the thicknesses of all the lenses in the first lens group 10 and the second lens group 20 on the optical axis and the zoom lens in the telephotoRatio range TT of total optical length in end state _1-n /TTLt<0.4, limiting the thickness of all lenses in the first lens group 10 and the second lens group 20, facilitating the manufacturing of the zoom lens, and simultaneously facilitating the realization of a large zoom ratio and having a good zoom effect. The ratio range can better balance the zooming performance and the manufacturability of processing and manufacturing.

In some embodiments, the zoom lens satisfies the following relationship:

0.6<f _G1 /f ₁ <1.2。

Wherein f _G1 F is the focal length of the first lens group 10 ₁ Is the focal length of the first lens 11.

The above relation defines a ratio range of 0.6 of the focal length of the first lens group 10 to the focal length of the first lens 11 in the first lens group 10<f _G1 /f ₁ <1.2, when satisfying this ratio scope, be favorable to rationally distributing the focal power of lens, avoid focal power local concentration in the lens group to cause the tolerance sensitivity, reduced the manufacturing degree of difficulty from this, be favorable to promoting the yields.

In some embodiments, the zoom lens satisfies the following relationship:

0.6<f _G1 /f ₄ <1.2。

wherein f _G1 F is the focal length of the first lens group 10 ₄ Is the focal length of the fourth lens 14.

The above relation defines a ratio of the focal length of the first lens group 10 to the focal length of the fourth lens 14 in the first lens group 10 of 0.6<f _G1 /f ₄ <1.2, when satisfying this ratio scope, be favorable to rationally distributing the focal power of lens, avoid focal power local concentration in the lens group to cause the tolerance sensitivity, reduced the manufacturing degree of difficulty from this, be favorable to promoting the yields.

Alternatively, the first lens 11 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the first lens 11, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The first lens 11 has positive optical power. The object side surfaces of the first lens element 11 are convex near the optical axis, and the image side surfaces of the first lens element 11 are concave near the optical axis. The object-side surfaces of the first lens element 11 are convex near the periphery, and the image-side surfaces of the first lens element 11 are concave near the periphery.

Alternatively, the second lens 12 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the second lens 12, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The second lens 12 has negative optical power. The object-side surface of the second lens element 12 may be convex or concave near the optical axis, and the image-side surface of the second lens element 12 may be concave near the optical axis. The object-side surface of the second lens element 12 may be convex or concave near the periphery, and the image-side surface of the second lens element 12 may be concave near the periphery.

Optionally, the third lens 13 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the third lens 13, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The third lens 13 may have positive optical power or negative optical power. The object side surface of the third lens element 13 may be convex or concave near the optical axis, and the image side surface of the third lens element 13 may be concave near the optical axis. The object-side surface of the third lens element 13 may be convex or concave near the periphery, and the image-side surface of the third lens element 13 may be concave near the periphery.

Optionally, the fourth lens 14 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the fourth lens 14, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The fourth lens 14 has negative optical power. The object-side surfaces of the fourth lens element 14 are convex near the optical axis, and the image-side surfaces of the fourth lens element 14 are convex near the optical axis. The object-side surfaces of the fourth lens element 14 are convex near the periphery, and the image-side surfaces of the fourth lens element 14 are convex near the periphery.

Optionally, the fifth lens 25 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the fifth lens 25, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The fifth lens 25 may have positive power or negative power. The object side surfaces of the fifth lens element 25 are concave near the optical axis, and the image side surface of the fifth lens element 25 may be convex or concave near the optical axis. The object-side surface of the fifth lens element 25 may be convex or concave near the periphery, and the image-side surface of the fifth lens element 25 may be convex or concave near the periphery.

Alternatively, the sixth lens 26 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the sixth lens 26, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The sixth lens 26 may have positive power or negative power. The object-side surfaces of the sixth lens element 26 are concave near the optical axis, and the image-side surface of the sixth lens element 26 may be convex or concave near the optical axis. The object-side surface of the sixth lens element 26 may be convex or concave near the periphery, and the image-side surface of the sixth lens element 26 may be convex or concave near the periphery.

Optionally, the seventh lens 27 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the seventh lens 27, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The seventh lens 27 has negative optical power. The object side surface of the seventh lens element 27 may be convex or concave near the optical axis, and the image side surface of the seventh lens element 27 may be convex or concave near the optical axis. The object-side surface of the seventh lens element 27 may be convex or concave near the periphery, and the image-side surface of the seventh lens element 27 may be convex or concave near the periphery.

Optionally, the eighth lens 28 may be made of plastic or glass, and may be made of other materials that can meet the performance requirements of the eighth lens 28, such as: composite materials in which fine particles of inorganic metal oxides, inorganic metal sulfides, or the like are blended into a resin matrix. The eighth lens 28 may have positive power or negative power. The object-side surface of the eighth lens element 28 may be convex or concave near the optical axis, and the image-side surface of the eighth lens element 28 may be convex or concave near the optical axis. The object-side surface of the eighth lens element 28 may be convex or concave near the periphery, and the image-side surface of the eighth lens element 28 may be convex or concave near the periphery.

Optionally, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 in the first lens group 10, and the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28 in the second lens group 20 are all made of plastic materials, so that the weight of the zoom lens can be controlled, and the difficulty in designing and manufacturing the motor in the lens module 100 can be reduced. In addition, according to the process characteristics of injection molding, the plastic material can realize the surface types of spherical surface, aspheric surface, free-form surface and the like with high precision requirements, and can meet the surface type requirements of the application on each lens in the first lens group 10 and the second lens group 20.

Optionally, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14 in the first lens group 10, and the fifth lens 25, the sixth lens 26, the seventh lens 27, and the eighth lens 28 in the second lens group 20 may be a hybrid design of glass and plastic, and the design and optical system design of the large aperture or ultra-large aperture imaging lens may be realized by using glass with more refractive index and abbe coefficient selection, and the zoom lens of the hybrid design of glass and plastic may further make the optical design have more architecture possibilities, and a zoom lens with miniaturization and high aberration correction capability may be obtained more easily.

Some specific, but non-limiting examples of embodiments of the present application are described in more detail below in conjunction with fig. 1-21.

Example 1

Fig. 1 shows a schematic diagram of a zoom lens according to a first embodiment. Fig. 1 (a) is a schematic view of a zoom lens according to the first embodiment at a short focal point; fig. 1 (b) shows a schematic view of the zoom lens according to the first embodiment at the telephoto end.

The zoom lens shown in fig. 1 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having positive optical power, a sixth lens 26 having negative optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having positive optical power.

According to the above relation, the design parameters of the zoom lens in the first embodiment of the present application are shown in table 1A below.

Table 1A example one design parameter

Table 1B shows aspherical coefficients of each lens of the zoom lens in the first embodiment of the present application, as shown in table 1B.

Table 1B aspherical coefficient of zoom lens of embodiment

Where k is the conic coefficient, A4, A6, A8, a10, a12, a14, a16, a18, a20 are aspheric coefficients.

In the first embodiment of the present application, the aspheric surface type equation of each surface may be:

wherein z is the relative distance between a point on the aspheric surface, which is a distance r from the optical axis, and a tangent plane tangent to the intersection point on the aspheric surface optical axis; r is the perpendicular distance of the point on the aspherical curve from the optical axis; c is the curvature; k is the conic coefficient; a4 to a20 are aspherical coefficients.

It should be understood that the aspherical surface of each lens in the zoom lens may use the aspherical surface shown in the above aspherical surface equation, or may use other aspherical surface formulas, which is not limited in this application.

Table 1C shows basic parameters of the zoom lens according to the first embodiment of the present application, as shown in table 1C.

Table 1C embodiment-zoom lens basic parameters

	Short focal end (wide)	Long focal length (tele)
			f	16.29mm	24.58mm
FNO	3.00	4.55
			FOV	26.96°	18.33°
TTL	20.02mm	20.19mm
			d1	4.41mm	0mm
d9	1.618mm	0.2mm
			d18	0.497mm	6.489mm

In table 1C, f represents the focal length of the zoom lens, FNO represents the aperture value, FOV represents the angle of view, TTL represents the total optical length, d1 represents the gap between the aperture stop 30 and the object side surface of the first lens element 11 on the optical axis, d9 represents the gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 represents the gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 2 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens of the first embodiment, wherein the solid line in fig. 2 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

Wherein (a) in fig. 2 shows an astigmatic field curve diagram of the zoom lens at a short focal length, and as can be seen from (a) in fig. 2, the focal offset in the meridian direction is controlled to be in the range of 0 to 0.005mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm; fig. 2 (b) shows an astigmatic field curve diagram of the zoom lens at the telephoto end, and as can be seen from fig. 2 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.005mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 3 is a schematic diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the first embodiment.

Wherein, (a) in fig. 3 shows a distortion curve diagram of the zoom lens at a short focal end, and it can be seen from (a) in fig. 3 that the distortion is controlled in a range of 0 to 2.5%; fig. 3 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 3 (b) that the distortion amount is controlled to be in the range of 0 to 1%. The maximum distortion of the zoom lens is within 2.5%, the distortion is low, and the better imaging quality is shown.

Example two

Fig. 4 shows a schematic diagram of a zoom lens of the second embodiment. Fig. 4 (a) shows a schematic view of the zoom lens according to the second embodiment at the short focal point; fig. 4 (b) is a schematic view of the zoom lens according to the second embodiment at the telephoto end.

The zoom lens shown in fig. 4 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having positive optical power, a sixth lens 26 having negative optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having positive optical power.

According to the above relation, the design parameters of the zoom lens in the second embodiment of the present application are shown in table 2A below.

Table 2A example two design parameters

Table 2B shows aspherical coefficients of each lens of the zoom lens in the second embodiment of the present application, as shown in table 2B.

Table 2B aspherical coefficients of the two-zoom lens of the embodiment

The aspherical surface of each lens in the zoom lens in the second embodiment may use the aspherical surface equation in the first embodiment, or may use other aspherical surface equations, which is not limited in this application.

Table 2C shows basic parameters of the zoom lens in the second embodiment of the present application, as shown in table 2C.

Table 2C example binary zoom lens basic parameters

	Short focal point	Long focal end
			f	17.00mm	24.00mm
FNO	3.15	4.44
			FOV	26.00°	18.75°
TTL	19.00mm	19.40mm
			d1	3.636mm	-0.4mm
d9	1.545mm	0.2mm
			d18	0.55mm	5.931mm

In table 2C, f represents the focal length of the zoom lens, FNO represents the aperture value, FOV represents the angle of view, TTL represents the total optical length, d1 represents the gap between the aperture stop 30 and the object side surface of the first lens element 11 on the optical axis, d9 represents the gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 represents the gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 5 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens of the second embodiment, wherein the solid line in fig. 5 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

Wherein, (a) in fig. 5 shows an astigmatic field curve diagram of the zoom lens at a short focal length, and as can be seen from (a) in fig. 5, the focal offset in the meridian direction is controlled to be in the range of 0 to 0.01mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm; fig. 5 (b) shows an astigmatic field diagram of the zoom lens at the telephoto end, and as can be seen from fig. 5 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.005mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 6 is a schematic diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the second embodiment.

Fig. 6 (a) shows a schematic diagram of a distortion curve of the zoom lens at a short focal point, and as can be seen from fig. 6 (a), the distortion is controlled to be in a range of 0 to 2%; fig. 6 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 6 (b) that the distortion amount is controlled to be in the range of 0 to 1%. The maximum distortion of the zoom lens is within 2%, the distortion is low, and the better imaging quality is shown.

Example III

Fig. 7 shows a schematic diagram of a zoom lens of the third embodiment. Wherein (a) in fig. 7 shows a schematic view of the zoom lens of the third embodiment at the short focal point; fig. 7 (b) shows a schematic view of the zoom lens according to the third embodiment at the telephoto end.

The zoom lens shown in fig. 7 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having negative optical power, a sixth lens 26 having positive optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having positive optical power.

According to the above relation, the design parameters of the zoom lens in the third embodiment of the present application are shown in table 3A below.

Table 3A example three design parameters

Table 3B shows aspherical coefficients of each lens of the zoom lens in the third embodiment of the present application, as shown in table 3B.

Table 3B aspherical coefficients of the triple zoom lens of the embodiment

The aspherical surface of each lens in the zoom lens in the third embodiment may use the aspherical surface equation in the first embodiment, or may use other aspherical surface equations, which is not limited in this application.

Table 3C shows basic parameters of the zoom lens in the third embodiment of the present application, as shown in table 3C.

Table 3C embodiment three zoom lens basic parameters

	Short focal point	Long focal end
			f	17.00mm	24.00mm
FNO	3.15	4.44
			FOV	26.00°	18.77°
TTL	19.00mm	19.40mm
			d1	3.484mm	-0.4mm
d9	1.47mm	0.2mm
			d18	0.55mm	5.706mm

In table 3C, f represents the focal length of the zoom lens, FNO represents the aperture value, FOV represents the angle of view, TTL represents the total optical length, d1 represents the gap between the aperture stop 30 and the object side surface of the first lens element 11 on the optical axis, d9 represents the gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 represents the gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 8 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens of the third embodiment, wherein the solid line in fig. 8 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

Wherein, (a) in fig. 8 shows an astigmatic field curve diagram of the zoom lens at a short focal length, and as can be seen from (a) in fig. 8, the focal offset in the meridian direction is controlled to be in the range of 0 to 0.015mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm; fig. 8 (b) shows an astigmatic field diagram of the zoom lens at the telephoto end, and as can be seen from fig. 8 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.01mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.025 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 9 is a diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the third embodiment.

Fig. 9 (a) shows a schematic diagram of a distortion curve of the zoom lens at a short focal point, and as can be seen from fig. 9 (a), the distortion is controlled to be in a range of 0 to 2.5%; fig. 9 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 9 (b) that the distortion amount is controlled in the range of 0 to 1%. The maximum distortion of the zoom lens is within 2.5%, the distortion is low, and the better imaging quality is shown.

Example IV

Fig. 10 shows a schematic diagram of a zoom lens of the fourth embodiment. Wherein (a) in fig. 10 shows a schematic view of the zoom lens of the fourth embodiment at the short focal point; fig. 10 (b) is a schematic view of the zoom lens according to the fourth embodiment at the telephoto end.

The zoom lens shown in fig. 10 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having negative optical power, a sixth lens 26 having positive optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having negative optical power.

In the fourth embodiment, the setting position of the aperture stop 30 may be on any one of the lenses in the first lens group 10, and may be moved following the first lens group 10. The exemplary placement of the aperture stop 30 on the object side of the second lens 12 in fig. 10 does not represent that the aperture stop 30 is placed only on the second lens 12, it being understood that the aperture stop 30 may also be placed on the first lens 11, the third lens 13, the fourth lens 14 and be able to follow the movement of the first lens group 10.

According to the above relation, the design parameters of the zoom lens in the fourth embodiment of the present application are shown in table 4A below.

Table 4A example four design parameters

Table 4B shows aspherical coefficients of each lens of the zoom lens in the fourth embodiment of the present application, as shown in table 4B.

Table 4B aspherical coefficients of the four-zoom lens of the embodiment

The aspherical surface of each lens in the zoom lens in the fourth embodiment may use the aspherical surface equation in the first embodiment, or may use other aspherical surface equations, which is not limited in this application.

Table 4C shows basic parameters of the zoom lens in the fourth embodiment of the present application, as shown in table 4C.

Table 4C example four zoom lens basic parameters

	Short focal point	Long focal end
			f	16.00mm	24.00mm
FNO	2.96	4.44
			FOV	27.60°	18.90°
TTL	15.34mm	19.90mm
			d9	1.707mm	0.2mm
d18	2.05mm	7.116mm

In table 4C, f denotes a focal length of the zoom lens, FNO denotes an aperture value, FOV denotes a field angle, TTL denotes an optical total length, d9 denotes a gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 denotes a gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 11 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens according to the fourth embodiment, wherein the solid line in fig. 11 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

Wherein, (a) in fig. 11 shows an astigmatic field diagram of the zoom lens at a short focal length, and as can be seen from (a) in fig. 11, the focal offset in the meridian direction is controlled to be in the range of 0 to 0.025mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.025 mm; fig. 11 (b) shows an astigmatic field diagram of the zoom lens at the telephoto end, and as can be seen from fig. 11 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.025mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.05 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 12 is a diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the fourth embodiment.

Fig. 12 (a) shows a schematic diagram of a distortion curve of the zoom lens at a short focal point, and as can be seen from fig. 12 (a), the distortion is controlled to be in the range of 0 to 2%; fig. 12 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 12 (b) that the distortion amount is controlled in the range of 0 to 0.2%. The maximum distortion of the zoom lens is within 2%, the distortion is low, and the better imaging quality is shown.

Example five

Fig. 13 shows a schematic diagram of a zoom lens of the fifth embodiment. Wherein (a) in fig. 13 shows a schematic view of the zoom lens of the fifth embodiment at the short focal point; fig. 13 (b) shows a schematic view of the zoom lens according to the fifth embodiment at the telephoto end.

The zoom lens shown in fig. 13 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having negative optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having positive optical power, a sixth lens 26 having negative optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having negative optical power.

According to the above relation, the design parameters of the zoom lens in the fifth embodiment of the present application are shown in table 5A below.

Table 5A example five design parameters

Table 5B shows aspherical coefficients of each lens of the zoom lens in fifth embodiment of the present application, as shown in table 5B.

Table 5B aspherical coefficients of five-zoom lens of example

The aspherical surface of each lens in the zoom lens in the fifth embodiment may use the aspherical surface equation in the first embodiment, or may use other aspherical surface equations, which is not limited in this application.

Table 5C shows basic parameters of the zoom lens in fifth embodiment of the present application, as shown in table 5C.

Table 5C embodiment five zoom lens basic parameters

	Short focal point	Long focal end
			f	17.00mm	24.00mm
FNO	3.15	4.44
			FOV	26.00°	18.77°
TTL	19.00mm	19.40mm
			d1	3.482mm	-0.4mm
d9	1.534mm	0.2mm
			d18	0.55mm	6.105mm

In table 5C, f represents the focal length of the zoom lens, FNO represents the aperture value, FOV represents the angle of view, TTL represents the total optical length, d1 represents the gap between the aperture stop 30 and the object side surface of the first lens element 11 on the optical axis, d9 represents the gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 represents the gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 14 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens of the fifth embodiment, wherein the solid line in fig. 14 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

In fig. 14, (a) shows an astigmatic field diagram of the zoom lens at a short focal length, and as can be seen from fig. 14, (a) the focal length shift in the meridian direction is controlled to be in the range of 0 to 0.01mm, and the focal length shift in the sagittal direction is controlled to be in the range of 0 to 0.025 mm; fig. 14 (b) shows an astigmatic field diagram of the zoom lens at the telephoto end, and as can be seen from fig. 14 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.005mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.02 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 15 is a diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the fifth embodiment.

Wherein, (a) in fig. 15 shows a distortion curve diagram of the zoom lens at the short focal end, and it can be seen from (a) in fig. 15 that the distortion amount is controlled in the range of 0 to 2.5%; fig. 15 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 15 (b) that the distortion amount is controlled in the range of 0 to 1%. The maximum distortion of the zoom lens is within 2.5%, the distortion is low, and the better imaging quality is shown.

Example six

Fig. 16 shows a schematic diagram of a zoom lens of the sixth embodiment. Wherein (a) in fig. 16 shows a schematic view of the zoom lens of the sixth embodiment at the short focal point; fig. 16 (b) is a schematic view showing a zoom lens according to the sixth embodiment at the telephoto end.

The zoom lens shown in fig. 16 includes: the first lens group 10 is composed of a first lens 11 having positive optical power, a second lens 12 having negative optical power, a third lens 13 having positive optical power, and a fourth lens 14 having positive optical power, and a second lens group 20 is composed of a fifth lens 25 having negative optical power, a sixth lens 26 having positive optical power, a seventh lens 27 having negative optical power, and an eighth lens 28 having negative optical power.

According to the above relation, the design parameters of the zoom lens in the sixth embodiment of the present application are shown in table 6A below.

Table 6A example six design parameters

Table 6B shows aspherical coefficients of each lens of the zoom lens in the sixth embodiment of the present application, as shown in table 6B.

Table 6B aspherical coefficients of six-zoom lens of example

The aspherical surface of each lens in the zoom lens in the sixth embodiment may use the aspherical surface equation in the first embodiment, or may use other aspherical surface equations, which is not limited in this application.

Table 6C shows basic parameters of the zoom lens in the sixth embodiment of the present application, as shown in table 6C.

Table 6C embodiment six zoom lens basic parameters

	Short focal point	Long focal end
			f	17.00mm	24.00mm
FNO	3.03	4.28
			FOV	26.00°	18.80°
TTL	19.00mm	19.40mm
			d1	3.366mm	-0.4mm
d9	1.677mm	0.2mm
			d18	0.55mm	5.794mm

In table 6C, f represents the focal length of the zoom lens, FNO represents the aperture value, FOV represents the angle of view, TTL represents the total optical length, d1 represents the gap between the aperture stop 30 and the object side surface of the first lens element 11 on the optical axis, d9 represents the gap between the image side surface of the fourth lens element 14 and the object side surface of the fifth lens element 25 on the optical axis, and d18 represents the gap between the image side surface of the eighth lens element 28 and the object side surface of the infrared cut filter 40 on the optical axis.

Fig. 17 is a schematic view showing an astigmatic field curve of light having a wavelength of 555nm passing through the zoom lens according to the sixth embodiment, wherein the solid line in fig. 17 is a focal point shift in the meridian direction, and the broken line is a focal point shift in the sagittal direction.

In fig. 17 (a) shows an astigmatic field diagram of the zoom lens at the short focal length, and as can be seen from fig. 17 (a), the focal length shift in the meridian direction is controlled to be in the range of 0 to 0.01mm, and the focal length shift in the sagittal direction is controlled to be in the range of 0 to 0.01 mm; fig. 17 (b) shows an astigmatic field diagram of the zoom lens at the telephoto end, and as can be seen from fig. 17 (b), the focal offset in the meridian direction is controlled to be in the range of 0 to 0.03mm, and the focal offset in the sagittal direction is controlled to be in the range of 0 to 0.03 mm. It can be seen that both astigmatism and field curvature are strictly corrected, and that the imaging quality is excellent.

Fig. 18 is a diagram showing distortion curves of light having wavelengths of 555nm, respectively, after passing through the zoom lens of the sixth embodiment.

Fig. 18 (a) shows a schematic diagram of a distortion curve of the zoom lens at the short focal point, and as can be seen from fig. 18 (a), the distortion is controlled to be in the range of 0 to 2.5%; fig. 18 (b) shows a schematic diagram of a distortion curve of the zoom lens at the telephoto end, and it can be seen from fig. 18 (b) that the distortion amount is controlled in the range of 0 to 1%. The maximum distortion of the zoom lens is within 2.5%, the distortion is low, and the better imaging quality is shown.

Table 7 lists the conditional expressions satisfied by the zoom lens described above and the values corresponding to the conditional expressions in the embodiment of the present application.

Table 7 conditional expressions satisfied by the zoom lens and values corresponding to the conditional expressions

Parameters and conditions	Example 1	Example two	Example III	Example IV	Example five	Example six
							f _G1 /fw	0.60	0.59	0.59	0.61	0.58	0.63
TTLt/ft	0.821	0.808	0.808	0.829	0.808	0.808
							FNOt	4.55	4.44	4.45	4.40	4.44	4.28
ft/fw	1.51	1.41	1.41	1.50	1.41	1.41
							TTLt/Imgh	5.05	4.85	4.85	4.98	4.85	4.85
TT _1-n /TTLt	0.26	0.27	0.28	0.27	0.28	0.29
							f _G1 /f ₁	0.70	1.03	0.85	0.77	0.99	0.91
f _G1 /f ₄	1.07	0.86	0.99	1.16	1.10	1.02

The zoom lens provided by the embodiment of the application has the advantages of large zoom ratio, excellent imaging quality, miniaturization, easiness in processing and manufacturing, high yield and the like under the condition that the design parameters meet the corresponding condition formulas.

The embodiment of the application further provides a lens module 100, where the lens module 100 includes a reflecting member 60, an electronic photosensitive element 50 and the zoom lens described above, the reflecting member 60 is located at an object side of the zoom lens and is used for deflecting light to the zoom lens, the electronic photosensitive element 50 is located at an image side of the zoom lens, and the zoom lens is used for imaging light to the electronic photosensitive element 50.

The reflecting element 60 may be disposed at any desired angle to bend the light path, and the reflecting element 60 deflects the light to the first lens group 10 of the zoom lens, and the light sequentially passes through the first lens group 10, the second lens group 20 and the ir cut filter 40 to be imaged on the electronic photosensitive element 50.

Fig. 19 is a schematic diagram of an example of a lens module 100 according to an embodiment of the present disclosure. Fig. 20 is a schematic diagram of another example of a lens module 100 according to an embodiment of the present disclosure.

As shown in fig. 19, in some embodiments, the reflecting member 60 is a prism, which includes two straight sides and one inclined side, and the light enters the prism through one straight side, is reflected by the inclined side, and then exits the prism through the other straight side. The hypotenuse can form an included angle of 45 degrees with the optical axis of the zoom lens, and the included angle can be adjusted as required. The structure, hypotenuse position, angle of the prism are not strictly limited in this application.

As shown in fig. 20, in some embodiments, the reflecting member 60 is a reflecting mirror, and the reflecting surface of the reflecting mirror may form an angle of 45 ° with the optical axis of the zoom lens, and the angle may be adjusted as required. The reflecting surface position, angle, etc. of the reflecting mirror are not strictly limited in this application.

The electron sensitive element 50 is a semiconductor chip, the surface of which contains several hundred thousand to several million photodiodes, and generates charges when irradiated with light. The electron sensitive element 50 may be a charge coupled device (chargecoupled device, CCD) or a Complementary Metal Oxide Semiconductor (CMOS) device. The charge coupled device is made of a semiconductor material with high photosensitivity and can convert light into electric charges. Charge-coupled devices are composed of a number of photosensitive units, typically in megapixels. When the surface of the charge coupling device is irradiated by light, each photosensitive unit reflects the charge on the component, and signals generated by all the photosensitive units are added together to form a complete picture. The complementary metal oxide semiconductor device is mainly made of two elements of silicon and germanium, so that N (band-to-electricity) and P (band+electricity) level semiconductors coexist on the complementary metal oxide semiconductor device, and the currents generated by the two complementary effects can be recorded and interpreted into images by the processing chip.

In this embodiment of the present application, the reflection member 60 can change the propagation direction of the light, so that the optical axis direction of the zoom lens can be different from the direction in which the external light enters the electronic device, and further, the arrangement position and angle of the zoom lens are more flexible, for example, the optical axis direction of the zoom lens can be parallel to the display screen 300 of the electronic device, thereby reducing the size requirement on the accommodating space in the thickness direction of the electronic device.

In addition, since the lens module 100 employs the zoom lens described above, the lens module 100 also has advantages of a large zoom ratio corresponding to the zoom lens, excellent imaging quality, miniaturization, easy processing and manufacturing, high yield, and the like.

Optionally, the lens module 100 may further include some or all of a holder (not shown), an autofocus drive assembly, a circuit board, a connector, and peripheral electronic components. The holder may hold the lens, and the autofocus drive assembly may include a voice coil motor, a driving integrated circuit, etc. for autofocus or optical anti-shake of the lens. The circuit board may be a flexible circuit board (flexible printed circuit, FPC) or a printed circuit board (printed circuit board, PCB) for transmitting electrical signals, wherein the FPC may be a single-sided flexible board, a double-sided flexible board, a multi-layer flexible board, a rigid flexible board, a flexible circuit board of a hybrid structure, or the like.

Fig. 21 is a schematic diagram of an electronic device provided in an embodiment of the present application. Parts (a) and (b) in fig. 21 are a front view and a rear view of the electronic device, respectively.

As shown in fig. 21, the embodiment of the application further provides an electronic device. The electronic device includes the lens module 100 provided in the foregoing embodiment, and further includes a processor, where the lens module 100 is configured to acquire image data and input the image data into the processor, and the processor is configured to process the image data.

The number of lens modules 100 to be mounted is not limited to one, but may be two or more, for example, two lens modules 100 are mounted on the back surface of the electronic device. The number of lens modules 100 to be mounted is not limited in this embodiment.

The lens module 100 may be used to take external video or pictures, may be used to take scenes of different ranges, for example, the lens module 100 may be used to take scenes at a distance, may be used to take scenes at a near distance, and may be used to take scenes at a macro distance. The lens module 100 may also be used for self-photographing, and the lens module 100 shown in fig. 21 located at the back of the mobile phone may also be used for a front camera or the like.

In addition, the electronic device further comprises a housing 200 and a display screen 300, the display screen 300 is mounted on the housing 200, a containing space is formed in the housing 200, the lens module 100 can be mounted in the containing space, the display screen 300 is electrically connected with the processor, and the display screen 300 can display pictures or videos processed by the processor.

Since the lens module 100 has the advantage of miniaturization, the size requirement for the accommodating space is reduced, and therefore, the thickness of the housing 200 can be reduced to achieve the light and thin electronic device, or the accommodating space saved by the lens module 100 can be reserved for other functional elements without changing the thickness of the housing 200.

Alternatively, the display screen 300 may be a light emitting diode (light emitting diode, LED) display screen 300, a liquid crystal (liquid crystal display, LCD) display screen 300, or an organic light-emitting diode (OLED) display screen 300, etc., but is not limited thereto.

Optionally, other devices may be included in the housing 200, such as, but not limited to, a battery, a flashlight, a fingerprint recognition module, a headset, a circuit board, a sensor, and the like.

Finally, it should be noted that: the foregoing is merely a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A zoom lens, characterized by comprising: a first lens group (10) with positive focal power and a second lens group (20) with negative focal power are sequentially arranged from an object side to an image side;

when the zoom lens zooms from a short focal end state to a long focal end state, the first lens group (10) and the second lens group (20) move towards the object side along the optical axis, and the distance between the first lens group (10) and the second lens group (20) is gradually reduced;

the first lens group (10) includes: a first lens (11) with positive focal power, a second lens (12) with negative focal power, a third lens (13) with focal power and a fourth lens (14) with positive focal power are arranged in sequence from an object side to an image side.

2. The zoom lens according to claim 1, wherein the zoom lens satisfies the following relation:

0.5<f _G1 /fw<0.8；

wherein f _G1 And fw is the focal length of the zoom lens in a short focal length state, wherein fw is the focal length of the first lens group (10).

3. The zoom lens according to claim 1 or 2, wherein the zoom lens satisfies the following relation:

TTLt/ft<1.0；

4. A zoom lens according to any one of claims 1 to 3, wherein the object-side surface of the first lens element (11) is convex and the image-side surface of the fourth lens element (14) is convex.

5. The zoom lens according to any one of claims 1 to 4, wherein the zoom lens satisfies the following relation:

FNOt<5；

wherein FNot is the aperture value of the zoom lens in the telephoto end state.

6. The zoom lens according to any one of claims 1 to 5, wherein the zoom lens satisfies the following relation:

ft/fw<1.6。

7. the zoom lens according to any one of claims 1 to 6, wherein the zoom lens satisfies the following relation:

TTLt/Imgh<5.5；

wherein Imgh is half of the diagonal length of the pixel region of the electron-sensitive element (50) on the focal plane.

8. The zoom lens according to any one of claims 1 to 7, wherein the zoom lens satisfies the following relation:

TT _1-n /TTLt<0.4；

wherein TT _1-n Is the sum of the thicknesses of all lenses in the first lens group (10) and the second lens group (20) on the optical axis.

9. The zoom lens according to any one of claims 1 to 8, wherein the zoom lens satisfies the following relation:

0.6<f _G1 /f ₁ <1.2；

Wherein f ₁ Is the focal length of the first lens (11).

10. The zoom lens according to any one of claims 1 to 9, wherein the zoom lens satisfies the following relation:

0.6<f _G1 /f ₄ <1.2；

wherein f ₄ Is the focal length of the fourth lens (14).

11. The zoom lens according to any one of claims 1 to 10, wherein the second lens group (20) comprises: a fifth lens (25) with optical power, a sixth lens (26) with optical power, a seventh lens (27) with negative optical power and an eighth lens (28) with optical power, which are arranged in sequence from an object side to an image side.

12. A lens module comprising a reflective element (60), an electronic photosensitive element (50) and a zoom lens according to any of claims 1 to 11, the reflective element (60) being located on an object side of the zoom lens for deflecting light to the zoom lens, the electronic photosensitive element (50) being located on an image side of the zoom lens, the zoom lens being arranged for imaging light to the electronic photosensitive element (50).

13. An electronic device comprising a processor and the lens module of claim 12, the lens module configured to acquire image data and input the image data into the processor, the processor configured to process the image data.