JP7216797B1 - Zoom lens and its driving method, photographing module and electronic device - Google Patents

Abstract

A zoom lens, a method for driving the same, an imaging module, and an electronic device are provided that solve the problem that it was difficult for conventional zoom lenses to meet the demand for miniaturization. A zoom lens according to an embodiment of the present application includes, in order from an object side to an image side along an optical axis, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, satisfying the following conditional expression. -2.5<f3/fw<-1.5-2.0<f1/fr<-1.0-1.0<f2/f3<-0.40.8<f2/fw<1.5f1: Focal length f2 of the first lens group: Focal length f3 of the second lens group: Focal length fw of the third lens group: Focal length fr of the zoom lens at the wide-angle end: The second lens group and the third lens group Combined focal length of the lens group at infinity at the wide-angle end [selection drawing] Fig. 1

Description

The present application belongs to the field of optical elements, and more particularly relates to a zoom lens and its driving method, an imaging module and an electronic device.

Assuming that the zoom lens is mounted on a small device, it is preferable that the total length of the zoom lens is as short as possible. However, in conventional zoom lenses, it is necessary to move at least two lens groups among the lens groups that make up the zoom lens during zooming and focusing. Must be secured within the zoom lens. In such cases, it has been difficult for conventional zoom lenses to meet the demand for miniaturization.

An object of the embodiments of the present application is to provide a zoom lens, a method for driving the zoom lens, a photographing module, and an electronic device that solve the problem that it was difficult for conventional zoom lenses to meet the demand for miniaturization.

As a first mode, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power are arranged in order from the object side to the image side along the optical axis. To provide a zoom lens that includes a lens group and satisfies the following conditional expression.
-2.5<f3/fw<-1.5 (1)
-2.0<f1/fr<-1.0 (2)
-1.0<f2/f3<-0.4 (3)
0.8<f2/fw<1.5 (4)
f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the zoom lens at the wide-angle end fr: the second lens group and the Combined focal length of the 3rd lens group at wide-angle end infinity

As a selectable implementation method, the zoom lens is positioned on the object side of the first lens group along the optical axis, and includes an optical path changing member for changing the traveling direction of light incident on the first lens group. Including further.

As an optional implementation, during zooming and/or focusing from the wide-angle end to the telephoto end of the zoom lens, the first lens group is fixed and the second lens group is oriented along the optical axis. and the third lens group is moved to the object side along the optical axis.

As an optional implementation, the first lens group includes at least one lens with negative refractive power and at least one lens with positive refractive power, wherein the at least one lens with negative refractive power A lens with power and at least one lens with positive refractive power are arranged along the optical axis.

As an optional implementation, the second lens group includes at least two lenses with positive refractive power and at least one lens with negative refractive power, wherein the at least two positive refractive power A lens with power and at least one lens with negative refractive power are arranged along the optical axis.

As an alternative implementation, said second lens group comprises four lenses, wherein said four lenses comprise two lenses with positive refractive power and two lenses with negative refractive power. or three lenses with positive refractive power and one lens with negative refractive power.

As an optional implementation, the third lens group includes at least one lens with negative refractive power and at least one lens with positive refractive power, wherein the at least one lens with negative refractive power A lens with power and at least one lens with positive refractive power are arranged along the optical axis.

As an alternative implementation, more than half of the lenses included in the zoom lens are plastic lenses.

As a second aspect, a method for driving a zoom lens is provided. The zoom lens is the zoom lens described above. The driving method includes holding the first lens group immovably, moving the second lens group toward the object side along the optical axis, and moving the third lens group toward the object side along the optical axis. using a driving device to drive zooming and/or focusing of the zoom lens from the wide-angle end to the telephoto end.

As a third aspect, there is provided a photographing module including the zoom lens described above and an image sensor provided on the image side of the zoom lens.

As a fourth aspect, there is provided an electronic device including a housing and the above imaging module provided in the housing.

In the embodiments of the present application, a first lens group having negative refractive power, a second lens group having positive refractive power, and a second lens group having negative refractive power are arranged in order from the object side to the image side along the optical axis. By making a zoom lens that includes three lens groups and satisfies the following conditional expressions, it is possible to shorten the zoom lens stroke and the overall length of the zoom lens, thereby reducing the size, thickness, and performance of the zoom lens. contribute to
-2.5<f3/fw<-1.5 (1)
-2.0<f1/fr<-1.0 (2)
-1.0<f2/f3<-0.4 (3)
0.8<f2/fw<1.5 (4)
f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the zoom lens at the wide-angle end fr: wide-angle of the second and third lens groups Composite focal length at end infinity

Other features, objects and advantages of the present application will become more apparent after reading the detailed description of non-limiting embodiments made with reference to the following drawings.

FIG. 1 is a schematic configuration diagram of a zoom lens according to an embodiment of the present disclosure. 2A, 2B, and 2C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 1 of the present application. 2D, 2E, and 2F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 1 of the present application. 2H, 2I, and 2J are a vertical spherical aberration diagram, an astigmatism curve, and a distortion diagram, respectively, at an intermediate position of the zoom lens in Example 1 of the present application. 2L, 2M, and 2N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 1 of the present application. 3A, 3B, and 3C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 2 of the present application. 3D, 3E, and 3F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 2 of the present application. 3H, 3I, and 3J are vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams, respectively, at an intermediate position of the zoom lens in Example 2 of the present application. 3L, 3M, and 3N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 2 of the present application. 4A, 4B, and 4C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 3 of the present application. 4D, 4E, and 4F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 3 of the present application. 4H, 4I, and 4J are a vertical spherical aberration diagram, an astigmatism curve, and a distortion diagram, respectively, at an intermediate position of the zoom lens in Example 3 of the present application. 4L, 4M, and 4N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 3 of the present application. 5A, 5B, and 5C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 4 of the present application. 5D, 5E, and 5F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 4 of the present application. 5H, 5I, and 5J are vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams, respectively, at an intermediate position of the zoom lens in Example 4 of the present application. 5L, 5M, and 5N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 4 of the present application. 6A, 6B, and 6C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 5 of the present application. 6D, 6E, and 6F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 5 of the present application. 6H, 6I, and 6J are a vertical spherical aberration diagram, an astigmatism curve, and a distortion aberration diagram, respectively, at an intermediate position of the zoom lens in Example 5 of the present application. 6L, 6M, and 6N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 5 of the present application. 7A, 7B, and 7C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 6 of the present application. 7D, 7E, and 7F are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the wide-angle end of the zoom lens in Example 6 of the present application. 7H, 7I, and 7J are a vertical spherical aberration diagram, an astigmatism curve, and a distortion aberration diagram, respectively, at an intermediate position of the zoom lens in Example 6 of the present application. 7L, 7M, and 7N are vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams, respectively, at the telephoto end of the zoom lens in Example 6 of the present application.

The technical solutions in the embodiments of the present application are clearly and completely described together with the drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative efforts shall fall within the protection scope of the present application.

The terms "first", "second", etc. in the specification and claims of this application are not used to describe a particular order or order, but to distinguish between similar objects. used. The data used in this manner may be interchanged, where appropriate, and the terms "first", "second", etc. may be used to allow embodiments of the present application to be practiced in orders other than that illustrated or described herein. It should be understood that the objects distinguished by are generally cognate and the number of objects is not limited, for example, the first object may be one or more. Without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

In the drawings, the thickness, size, and shape of the lens are slightly exaggerated for convenience of explanation. Specifically, the shape of a spherical surface or an aspherical surface shown in the drawing is shown as an example. That is, the shape of the spherical or aspherical surface is not limited to those illustrated. The drawings are illustrative only and are not drawn exactly to scale.

Unless otherwise specified, all terms (including technical terms and scientific terms) used in the examples of the present application are generally understood by those who have ordinary knowledge in the technical field to which the present application belongs. have the same meaning as Terms (e.g., terms defined in common dictionaries) should be construed to have a meaning consistent with the contextual meaning of the relevant art, and unless explicitly defined in the examples herein, ideal should not be construed in a formal or overly formal sense.

Optionally, lenses according to embodiments of the present application may be selected from, but not limited to, liquid lenses, film lenses and/or liquid crystal lenses.

For the sake of clarity, technical terms according to the embodiments of the present application will be first interpreted and explained below.
Optical axis: A direction in which light rays are guided in an optical system, with reference to the chief ray of the central visual field.
Focal point: the point at which light rays parallel to the optical axis converge after being refracted by a lens.
Focal length, also called focal length, is a metric that measures the convergence or divergence of light in an optical system such that an object at infinity passes through a lens to form a sharp image at the focal plane. It refers to the distance from the optical center of the lens to the focal point. For a fixed focus lens, the focal length is fixed because the position of its optical center is fixed. A zoom lens can adjust the focal length because the focal length of the lens changes when the optical center of the lens changes.
Object distance: the distance between the subject and the lens.
Image Distance: The distance between the image of the subject and the lens.
The side of the lens on which the subject is located is called the object side, and the surface of the lens closer to the object side is called the object side surface.
The side of the lens on which the image of the subject is positioned is called the image side, and the surface of the lens closer to the image side is called the image side.

A zoom lens, a driving method thereof, an imaging module, and an electronic device according to embodiments of the present application will be described in detail below.

FIG. 1 is a schematic configuration diagram of a zoom lens according to an embodiment of the present disclosure. As shown in FIG. 1, the zoom lens 10 includes, in order from the object side to the image side along the optical axis, a first lens group 11 having negative refractive power and a second lens group 12 having positive refractive power. , and a third lens group 13 having negative refractive power. In FIG. 1, the first lens group 11 includes two lenses, the second lens group 12 includes four lenses, and the third lens group 13 includes two lenses. Examples are non-limiting. The first lens group 11, the second lens group 12 and the third lens group 13 can be set according to actual requirements.

Here, the zoom lens 10 satisfies the following conditional expressions.
-2.5<f3/fw<-1.5 (1)
-2.0<f1/fr<-1.0 (2)
-1.0<f2/f3<-0.4 (3)
0.8<f2/fw<1.5 (4)
f1: focal length of first lens group 11 f2: focal length of second lens group 12 f3: focal length of third lens group 13 fw: focal length of zoom lens 10 at the wide-angle end fr: second lens group 12 and Combined focal length of three lens groups 13 at wide-angle end infinity

In the zoom lens 10 of the embodiment of the present application, the first lens group 11 having negative refractive power is fixed and the first lens group 11 having positive refractive power is fixed during zooming and/or focusing from the wide-angle end to the telephoto end. The second lens group 12 is moved to the object side along the optical axis, and the third lens group 13 having negative refractive power is moved to the object side along the optical axis, that is, the second lens group 12 and the third lens. Only the group 13 is moved along the optical axis toward the object side and satisfies the above conditions (1) to (4). As a result, it is possible to make the zoom lens 10 smaller, thinner, and higher in performance.

If the lower limit of conditional expression (1) is not reached, the refractive power of the third lens group 13 becomes too small, the amount of movement during zooming and/or focusing increases, the total optical length increases, and the zoom lens 10 becomes difficult to miniaturize. If the upper limit of conditional expression (1) is exceeded, the refractive power of the third lens group 13 becomes too large, and the refractive power of each lens constituting the third lens group 13 increases, ensuring a lens shape that can be produced. In addition, aberration fluctuations during zooming become large, and high performance cannot be satisfied. Satisfying conditional expression (1) ensures that the zoom lens 10 can be downsized and have high performance.

If the lower limit of conditional expression (2) is not reached, the refracting power of the lens having negative refracting power in the first lens group 11 becomes too small, the inverse telephoto type refracting power arrangement weakens at the wide-angle end, and the back focus becomes short. As a result, it becomes difficult to secure a space for arranging components such as an IF filter. If the upper limit of conditional expression (2) is exceeded, the refractive power of the first lens group 11 becomes too large, and the refractive power arrangement of the zoom lens 10 at the wide-angle end becomes a strong inverse telephoto arrangement, resulting in a large back focus. As a result, the zoom lens 10 becomes large. By satisfying the conditional expression (2), realization of downsizing and high performance of the zoom lens 10 is guaranteed.

If the lower limit of conditional expression (3) is not reached, the refractive power of the second lens group 12 becomes too small, the zoom stroke of the second lens group 12 increases, and the overall size of the zoom lens 10 increases. If the upper limit of conditional expression (3) is exceeded, the refractive power of the second lens group 12 becomes too large, making it difficult to correct variations in spherical aberration over the entire zoom range. By satisfying the conditional expression (3), realization of downsizing and high performance of the zoom lens 10 is guaranteed.

If the lower limit of conditional expression (4) is not reached, the refractive power of the second lens group 12 becomes too large, making it difficult to correct aberrations over the entire zoom range. If the upper limit of conditional expression (4) is exceeded, the refractive power of the second lens group 12 becomes too small, the amount of zoom movement increases in order to secure a predetermined zoom ratio, and the total optical length increases. By satisfying the conditional expression (4), realization of downsizing and high performance of the zoom lens 10 is guaranteed.

As an alternative implementation, as shown in FIG. 1, the zoom lens 10 is positioned on the object side of the first lens group 11 along the optical axis to change the traveling direction of light incident on the first lens group 11. It further includes an optical path changing member 14 for. Therefore, it is possible to secure sufficient entrance of light into the zoom lens 10, which is advantageous in making the zoom lens 10 smaller, thinner, and higher in performance.

As an alternative implementation, as shown in FIG. 1, the zoom lens 10 further includes an IR cut filter 15 and an imaging plane 16. FIG. However, it is not limited to this.

As an alternative implementation, the first lens group 11 comprises at least one lens with negative refractive power and at least one lens with positive refractive power, the at least one lens with negative refractive power. A lens with power and at least one lens with positive refractive power are arranged along the optical axis. From the relationship between chromatic aberration and size, the first lens group 11 having negative refractive power is composed of at least one lens having negative refractive power and at least one lens having positive refractive power. , the performance of the first lens group 11 can be kept good.

As an alternative implementation, the second lens group 12 includes at least two lenses with positive refractive power and at least one lens with negative refractive power, the at least two positive refractive power lenses A lens with power and at least one lens with negative refractive power are arranged along the optical axis. Thus, by configuring the second lens group 12 with a plurality of lenses, it is possible to achieve a large aperture, and the second lens group 12 can satisfactorily correct chromatic aberration and spherical aberration.

As a preferred embodiment, the second lens group 12 comprises four lenses, wherein the four lenses are two lenses with positive refractive power and two lenses with negative refractive power. or three lenses with positive refractive power and one lens with negative refractive power.

As an alternative implementation, the third lens group 13 comprises at least one lens with negative refractive power and at least one lens with positive refractive power, wherein said at least one lens with negative refractive power A lens with power and at least one lens with positive refractive power are arranged along the optical axis. From the relationship between chromatic aberration and size, the third lens group 13 having negative refractive power is composed of at least one lens having negative refractive power and at least one lens having positive refractive power. , the performance of the third lens group 13 can be kept good. In addition, since the third lens group 13 has a negative refractive power, the lens diameters of the first lens group 11 and the second lens group 12 can be reduced, and the zoom lens 10 can be made to have a large diameter and high performance. and miniaturization can be compatible.

As an alternative implementation, more than half of all the lenses included in the zoom lens 10 are plastic lenses. By using a large amount of plastic lenses in this manner, the zoom lens 10 can be improved in performance and reduced in size, and low production costs can be realized.

Embodiments of the present application further provide a zoom lens driving method. The zoom lens is the zoom lens 10 described above. In this driving method, the first lens group 11 is held stationary, and the second lens group 12 is moved along the optical axis toward the object side and the third lens group 13 is moved toward the object side along the optical axis. using a driving device to drive zooming and/or focusing of the zoom lens from the wide-angle end to the telephoto end.
In specific embodiments of the present application, the lens surface of each lens is formed as an aspherical surface if necessary. The aspherical shapes adopted for these lens surfaces are Z as the axis in the optical axis direction, H as the height in the direction perpendicular to the optical axis X, K as the conic coefficient, and A, B, C, and D as the aspheric coefficients. is expressed by the following equation.

Hereinafter, zoom lenses according to specific examples of the present application will be described in detail with reference to the drawings.

Example 1
Hereinafter, the content of the zoom lens in Example 1 of the present application will be described with reference to FIGS. 2A to 2N. 2A, 2B, and 2C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 1 of the present application.

As shown in FIG. 2A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the numbers of the object side surface and the image side surface are 1 to 4 in Table 1. The second lens group E2 includes four lenses, and the numbers of the object-side and image-side surfaces are 5-12 in Table 1. The third lens group E3 includes two lenses, and the numbers of the object side surface and the image side surface are 13-16 in Table 1. The object-side and image-side numbers of the IR cut filter E0 are 17-18 in Table 1. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 1 below shows lens data of the zoom lens in Example 1 of the present application. However, R is the radius of curvature, Th is the interplanar spacing, Nd is the refractive index, Vd is the Abbe number, and infinity is infinity.

Table 2 below shows the aspheric surface data of the zoom lens in Example 1 of the present application.

Table 3 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 1) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 1 of the present application. It is shown.

In Example 1 of the present application, the longitudinal spherical aberration diagram (LONGITUDINAL SPHERICAL ABER), the astigmatism curve (ASTIGMATIC FIELD CURVES), and the distortion aberration diagram (DISTORTION) at the wide-angle end of the zoom lens are shown in FIGS. 2D, 2E, and 2F, respectively. shown in Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 2H, 2I, and 2J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 2L, 2M, and 2N, respectively. FOCUS (MILLMETERS) indicates focus adjustment, and the unit of focus adjustment is mm. As is clear from these figures, the zoom lens of Example 1 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Example 2
Hereinafter, the content of the zoom lens in Example 2 of the present application will be described with reference to FIGS. 3A to 3N. 3A, 3B, and 3C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 2 of the present application.

As shown in FIG. 3A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the object-side and image-side numbers are 1 to 4 in Table 4. The second lens group E2 includes four lenses, and the numbers of the object-side and image-side surfaces are 5-11 in Table 4. The third lens group E3 includes two lenses, and the numbers of the object-side and image-side surfaces are 12-15 in Table 4. The object-side and image-side numbers of the IR cut filter E0 are 16-17 in Table 4. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 4 below shows lens data of the zoom lens in Example 2 of the present application.

Table 5 below shows the aspheric surface data of the zoom lens in Example 2 of the present application.

Table 6 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 4) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 2 of the present application. It is shown.

In Example 2 of the present application, vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the wide-angle end of the zoom lens are shown in FIGS. 3D, 3E, and 3F, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 3H, 3I, and 3J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 3L, 3M, and 3N, respectively. As is clear from these figures, the zoom lens of Example 2 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Example 3
Hereinafter, details regarding the zoom lens in Example 3 of the present application will be described with reference to FIGS. 4A to 4N. 4A, 4B, and 4C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 3 of the present application.

As shown in FIG. 4A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the object-side and image-side numbers are 1 to 4 in Table 7. The second lens group E2 includes four lenses, and the object-side and image-side numbers are 5-11 in Table 7. The third lens group E3 includes two lenses, and the numbers of the object-side and image-side surfaces are 12-15 in Table 7. The object-side and image-side numbers of the IR cut filter E0 are 16-17 in Table 1. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 7 below shows the lens data of the zoom lens in Example 3 of the present application.

Table 8 below shows the aspheric surface data of the zoom lens in Example 3 of the present application.

Table 9 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 7) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 3 of the present application. It is shown.

In Example 3 of the present application, vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams at the wide-angle end of the zoom lens are shown in FIGS. 4D, 4E, and 4F, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 4H, 4I, and 4J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 4L, 4M, and 4N, respectively. As is clear from these figures, the zoom lens of Example 3 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Example 4
Hereinafter, details regarding the zoom lens in Example 4 of the present application will be described with reference to FIGS. 5A to 5N. 5A, 5B, and 5C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 4 of the present application.

As shown in FIG. 5A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the object-side and image-side numbers are 1 to 4 in Table 10. The second lens group E2 includes four lenses, and the object-side and image-side numbers are 5-11 in Table 10. The third lens group E3 includes two lenses, and the object-side and image-side numbers are 12-15 in Table 10. The object-side and image-side numbers of the IR cut filter E0 are 16-17 in Table 10. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 10 below shows the lens data of the zoom lens in Example 4 of the present application.

Table 11 below shows the aspheric surfaces of the zoom lens in Example 4 of the present application.

Table 12 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 10) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 4 of the present application. It is shown.

In Example 4 of the present application, vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams at the wide-angle end of the zoom lens are shown in FIGS. 5D, 5E, and 5F, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 5H, 5I, and 5J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 5L, 5M, and 5N, respectively. As is clear from these figures, the zoom lens of Example 4 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Example 5
Hereinafter, details regarding the zoom lens in Example 5 of the present application will be described with reference to FIGS. 6A to 6N. 6A, 6B, and 6C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 5 of the present application.

As shown in FIG. 6A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the numbers of the object side surface and the image side surface are 1 to 4 in Table 13. The second lens group E2 includes four lenses, and the object-side and image-side numbers are 5-12 in Table 13. The third lens group E3 includes two lenses, and the numbers of the object-side and image-side surfaces are 13-16 in Table 13. The object-side and image-side numbers of the IR cut filter E0 are 17-18 in Table 13. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 13 below shows the lens data of the zoom lens in Example 5 of the present application.

Table 14 below shows the aspheric surface data of the zoom lens in Example 5 of the present application.

Table 15 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 13) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 5 of the present application. It is shown.

In Example 5 of the present application, vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams at the wide-angle end of the zoom lens are shown in FIGS. 6D, 6E, and 6F, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 6H, 6I, and 6J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 6L, 6M, and 6N, respectively. As is clear from these figures, the zoom lens of Example 5 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Example 6
Hereinafter, details regarding the zoom lens in Example 5 of the present application will be described with reference to FIGS. 7A to 7N. 7A, 7B, and 7C are schematic diagrams of the wide-angle end, intermediate position, and telephoto end, respectively, of the zoom lens in Example 6 of the present application.

As shown in FIG. 7A, the zoom lens includes, in order from the object side to the image side along the optical axis, a first lens group E1 having negative refractive power, a second lens group E2 having positive refractive power, It includes a third lens group E3 having negative refractive power and an IR cut filter E0. The first lens group E1 includes two lenses, and the numbers of the object side and the image side are 1 to 4 in Table 16. The second lens group E2 includes four lenses, and the object-side and image-side numbers are 5-11 in Table 16. The third lens group E3 includes two lenses, and the numbers of the object-side and image-side surfaces are 12-15 in Table 16. The object-side and image-side numbers of the IR cut filter E0 are 16-17 in Table 16. Light from an object sequentially passes through each lens group and IR cut filter, and finally forms an image on the coupling surface.

Table 16 below shows the basic specifications of the zoom lens in Example 6 of the present application.

Table 17 below shows the aspheric surface data of the zoom lens in Example 6 of the present application.

Table 18 shows the effective focal length EFL, aperture Fno, and Th at each zoom position (that is, a, b, and c shown in Table 16) at the wide-angle end, intermediate position, and telephoto end of the zoom lens according to Example 6 of the present application. It is shown.

In Example 6 of the present application, vertical spherical aberration diagrams, astigmatism curves, and distortion aberration diagrams at the wide-angle end of the zoom lens are shown in FIGS. 7D, 7E, and 7F, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at intermediate positions of the zoom lens are shown in FIGS. 7H, 7I, and 7J, respectively. Vertical spherical aberration diagrams, astigmatism curves, and distortion diagrams at the telephoto end of the zoom lens are shown in FIGS. 7L, 7M, and 7N, respectively. As is clear from these figures, the zoom lens of Example 6 of the present application can keep aberrations, curvature of field, and distortion small at the wide-angle end, intermediate position, and telephoto end.

Table 19 shows the focal lengths f1, f2, f3, fw, and fr of the zoom lenses in Examples 1 to 6 of the present application and conditional expressions to be satisfied.

Embodiments of the present application further provide a photography module including an image sensor and the zoom lens 10 described above, wherein the image sensor is provided on the image side of the zoom lens 10 . The zoom lens 10 is used to receive a light signal of a subject and project it to an image sensor, and the image sensor is used to convert the light signal corresponding to the subject into an image signal. The explanation is omitted.

Embodiments of the present application further provide an electronic device including a housing and the above-described imaging module, wherein the imaging module is provided on the housing for obtaining image information. Here, electronic equipment includes handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to wireless modems, including cellular phones, smart phones, personal digital assistants (PDAs). assistant computers, tablet computers, laptop computers, video cameras, video recorders, cameras, smart watches, smart wristbands, vehicle-mounted computers, and others with imaging capabilities. Also includes electronic devices. The embodiments of the present application do not particularly limit the specific form of the electronic device. Taking a smartphone as an example, by installing the zoom lens of the present application, effects such as miniaturization, thinning, and excellent photographing performance can be achieved.

The above description is merely that of the preferred embodiment of the present application and the technical principles used. The scope of protection of the present application is not limited to technical solutions by a specific combination of the above technical configurations, but without departing from the spirit of the corresponding invention, for example, the above configurations and disclosed in the present application (limited to It is not appropriate to cover other technical solutions by any combination of the above technical configurations and their equivalent configurations, such as technical solutions by mutual replacement of technical configurations with similar functions. Businesses should understand.

10: Zoom lens 11: First lens group 12: Second lens group 13: Third lens group 14: Optical path changing member 15: IR cut filter 16: Imaging surface

Claims (9)

From the first lens group having negative refractive power, the second lens group having positive refractive power, and the third lens group having negative refractive power in order from the object side to the image side along the optical axis. A zoom lens configured and satisfying the following conditional expression,
-2.5<f3/fw<-1.5 (1)
-2.0<f1/fr<-1.0 (2)
-1.0<f2/f3<-0.4 (3)
0.8<f2/fw<1.5 (4)
f1: focal length of the first lens group f2: focal length of the second lens group f3: focal length of the third lens group fw: focal length of the zoom lens at the wide-angle end fr: the second lens group and the Combined focal length of the 3rd lens group at wide-angle end infinity
During zooming from the wide-angle end to the telephoto end, the first lens group is fixed, and the second lens group and the third lens group move along the optical axis while changing the distance between the lens groups. to move to the object side,
The second lens group includes at least two lenses having positive refractive power and at least one lens having negative refractive power, wherein the at least two lenses having positive refractive power and at least one 1. A zoom lens comprising a lens having negative refractive power and arranged along an optical axis. 2. The optical system according to claim 1, further comprising an optical path changing member located on the object side of the first lens group along the optical axis and for changing the traveling direction of light incident on the first lens group. zoom lens. The first lens group includes at least one lens having negative refractive power and at least one lens having positive refractive power, and the at least one lens having negative refractive power and at least one lens having positive refractive power. 2. The zoom lens according to claim 1, wherein the lenses having positive refractive power are arranged along the optical axis. the second lens group comprises four lenses, wherein the four lenses comprise two lenses with positive refractive power and two lenses with negative refractive power, or 4. The zoom lens of claim 3 , comprising three lenses with positive refractive power and one lens with negative refractive power. The third lens group includes at least one lens having negative refractive power and at least one lens having positive refractive power, and the at least one lens having negative refractive power and at least one lens having positive refractive power. 2. The zoom lens according to claim 1, wherein the lenses having positive refractive power are arranged along the optical axis. 2. The zoom lens according to claim 1, wherein plastic lenses are used for more than half of all lenses included in said zoom lens. A zoom lens driving method according to any one of claims 1 to 6 ,
The first lens group is held immovably, and the movement of the second lens group along the optical axis toward the object side and the movement of the third lens group along the optical axis toward the object side are controlled by a driving device. A method of driving a zoom lens, comprising: driving the zoom lens for zooming from the wide-angle end to the telephoto end and/or for focusing. A photographing module comprising: the zoom lens according to any one of claims 1 to 6 ; and an image sensor provided on the image side of the zoom lens. An electronic device comprising: a housing; and the imaging module according to claim 8 provided in the housing.

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