Automatic focusing lens and optical device

Abstract

The invention provides an automatic focusing lens and an optical device, and relates to the technical field of optical elements. The automatic focusing lens comprises a first lens group, a diaphragm and a second lens group which are sequentially arranged on an optical axis along a direction from an object side to an image side, wherein any one of the first lens group and the second lens group comprises at least one fixed-focus lens; and at least one liquid lens arranged on the optical axis. By optimizing the positions of the liquid lens, the first lens group and the second lens group, the focal length of the liquid lens and the focal length of the first lens group, or the focal length of the second lens group, or the focal length of the automatic focusing lens are optimized to meet respective corresponding conditions, so that the automatic focusing lens can focus and image clearly along with the change of the shooting distance. The liquid lens can realize the zooming function without being controlled by mechanical structures such as a voice coil motor, so that by adopting the liquid lens, the focusing response speed of the automatic focusing lens can be improved, and the volume of the automatic focusing lens can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of optical elements, and more specifically, to an autofocus lens and an optical device. Background Art

[0002] With the development of optical lenses, optical lenses with various uses have appeared on the market. Optical lenses need to be refocused in different scenarios. In today's applications, there are two types of focus: manual focus and automatic focus. The automatic focus method is the mainstream focus method in the market. Specifically, the lens or lens is pushed by a voice coil motor to achieve lens focus. This automatic focus method uses a mechanical control structure to effectively achieve clear imaging, and at the same time matches some software controls to achieve precise focus control. However, due to the use of mechanical control related structures, the response speed of the lens when focusing is low and is easily noticed by users; and mechanical control to achieve focus is achieved by moving the lens. Therefore, in the process of moving the lens, it is necessary to reserve the space required for the lens to focus, which results in a larger overall size of the optical device. Summary of the invention

[0003] In view of this, the present application provides an autofocus lens and an optical device, which effectively solve the technical problems existing in the prior art. Under the condition that the autofocus lens can clearly focus and image as the shooting distance changes, the use of a liquid lens can improve the focusing response speed of the autofocus lens and reduce the size of the autofocus lens.

[0004] To achieve the above objectives, the technical solutions provided by this application are as follows:

[0005] An auto-focus lens, comprising:

[0006] A first lens group, a stop, and a second lens group are sequentially arranged along the direction from the object side to the image side and on the optical axis, wherein any one of the first lens group and the second lens group includes at least one fixed-focus lens;

[0007] And, at least one liquid lens is arranged on the optical axis, wherein the optical focal length D of the liquid lens satisfies the condition: -15≤D≤15, and the position of the liquid lens is different from that of the first lens group and the second lens group, so that the focal length of the liquid lens satisfies the respective corresponding conditions with the focal length of the first lens group, or with the focal length of the second lens group, or with the focal length of the autofocus lens.

[0008] Optionally, the liquid lens is located on a side of the first lens group away from the second lens group, wherein the focal length of the liquid lens and the focal length of the first lens group satisfy the following conditions:

[0009]

[0010] LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and F1 is the focal length of the first lens group.

[0011] Optionally, the liquid lens is located between the first lens group and the second lens group, wherein the focal length of the liquid lens and the focal length of the second lens group satisfy the following conditions:

[0012]

[0013] LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and F2 is the focal length of the second lens group.

[0014] Optionally, the liquid lens is located on a side of the second lens group away from the first lens group, wherein the focal length of the liquid lens and the focal length of the autofocus lens satisfy the following conditions:

[0015]

[0016] LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and EFL is the focal length of the autofocus lens.

[0017] Optionally, the first lens group includes at least two fixed-focus lenses, and the at least two fixed-focus lenses are arranged sequentially on the optical axis;

[0018] And / or, the second lens group includes at least three fixed-focus lenses, and the at least three fixed-focus lenses are arranged sequentially on the optical axis.

[0019] Optionally, the first lens group includes: three fixed-focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, a first lens, a second lens and a third lens;

[0020] And, the second lens group includes: five fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens;

[0021] Wherein, the autofocus lens comprises: a liquid lens arranged on the optical axis, the liquid lens is located on the side of the first lens away from the second lens; or, the liquid lens is located on the side of the eighth lens away from the seventh lens. Optionally, the first lens group comprises: two fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis are the ninth lens and the tenth lens;

[0022] And, the second lens group includes: three fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, an eleventh lens, a twelfth lens and a thirteenth lens;

[0023] Wherein, the autofocus lens comprises: a liquid lens arranged on the optical axis, and the liquid lens is located between the aperture and the eleventh lens.

[0024] Optionally, the liquid lens comprises:

[0025] A transparent substrate and a transparent film are arranged opposite to each other and form a cavity, wherein the cavity is used to fill a transparent liquid with a preset refractive index and a preset Abbe constant.

[0026] Optionally, the preset refractive index is:

[0027] 1.2≤Nd1≤1.6,

[0028] And, the preset Abbe constant is:

[0029] 60≤Vd1≤110,

[0030] Nd1 is the preset refractive index, and Vd1 is the preset Abbe constant.

[0031] Based on the same inventive concept, the present application also provides an optical device, which includes the above-mentioned autofocus lens.

[0032] Compared with the prior art, the technical solution provided by this application has at least the following advantages:

[0033] The present application provides an autofocus lens and an optical device, wherein the autofocus lens comprises: a first lens group, a stop, and a second lens group which are sequentially arranged on an optical axis along a direction from an object side to an image side, wherein any one of the first lens group and the second lens group comprises at least one fixed-focus lens; and at least one liquid lens arranged on the optical axis, wherein a focal length D of the liquid lens satisfies the condition: -15≤D≤15, and the position of the liquid lens is different from that of the first lens group and the second lens group, so that a focal length of the liquid lens satisfies respective corresponding conditions with a focal length of the first lens group, or with a focal length of the second lens group, or with a focal length of the autofocus lens.

[0034] As can be seen from the above content, the technical solution provided by the present application optimizes the position of the liquid lens and the first lens group and the second lens group, and optimizes the focal length of the liquid lens and the focal length of the first lens group, or the focal length of the second lens group, or the focal length of the autofocus lens to meet the respective corresponding conditions, so that the autofocus lens can focus and image clearly as the shooting distance changes. In addition, the liquid lens can achieve the zoom function without the need for mechanical structure control such as a voice coil motor. Therefore, the use of a liquid lens can not only improve the focus response speed of the autofocus lens, but also reduce the size of the autofocus lens. In addition, the optical focal length of the liquid lens is limited, and the imaging clarity of the autofocus lens is improved in combination with the first lens group, the aperture and the second lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of the structure of an auto-focus lens provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0042] Figure 7 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0043] Figure 8 A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0044] Fig. 9A schematic diagram of the structure of another auto-focus lens provided in an embodiment of the present application;

[0045] Fig.10 A schematic structural diagram of a transparent liquid injection device for a liquid lens provided in an embodiment of the present application;

[0046] Fig.11 An MTF diagram of an autofocus lens provided in an embodiment of the present application at a second object distance;

[0047] Fig.12 An MTF diagram of an autofocus lens provided in an embodiment of the present application at a first object distance;

[0048] Fig.13 An MTF diagram of another autofocus lens provided in an embodiment of the present application at a second object distance;

[0049] Fig.14 An MTF diagram of another autofocus lens provided in an embodiment of the present application at a first object distance;

[0050] Fig.15 An MTF diagram of another autofocus lens provided in an embodiment of the present application at a second object distance;

[0051] Fig.16 This is an MTF diagram of another autofocus lens provided in an embodiment of the present application at a first object distance.

[0052] Reference numerals:

[0053] 100-first lens group; 200-second lens group; 300-aperture; 400-liquid lens; 101-first lens; 102-second lens; 103-third lens; 204-fourth lens; 205-fifth lens; 206-sixth lens; 207-seventh lens; 208-eighth lens; 109-ninth lens; 1010-tenth lens; 2011-eleventh lens; 2012-twelfth lens; 2013-thirteenth lens; 410-liquid injection groove; 420-push-pull assembly. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0055] As described in the background technology, with the development of optical lenses, optical lenses with various uses have appeared on the market. Optical lenses need to be refocused in different scenarios. In today's applications, there are two types of focus: manual focus and automatic focus. Among them, the automatic focus method is the mainstream focus method in the market, specifically, the lens or lens is pushed by a voice coil motor to achieve lens focus. This automatic focus method uses a mechanical control structure to effectively achieve clear imaging, and at the same time matches some software controls to achieve precise focus control. However, due to the use of mechanical control related structures, the response speed of the lens when focusing is low, which is easy to be noticed by the user; and mechanical control to achieve focus is a focusing method achieved by moving the lens, so in the process of moving the lens, it is necessary to reserve the space required for the lens to focus, which results in a larger overall volume of the optical device.

[0056] Based on this, the embodiments of the present application provide an autofocus lens and an optical device, which effectively solve the technical problems existing in the prior art. Under the condition that the autofocus lens can clearly focus and image as the shooting distance changes, the use of a liquid lens can improve the focusing response speed of the autofocus lens and reduce the size of the autofocus lens.

[0057] To achieve the above purpose, the technical solution provided in the embodiment of the present application is as follows, specifically combined with Figures 1 to 16 The technical solution provided in the embodiments of the present application is described in detail.

[0058] refer to Figure 1 As shown, it is a schematic diagram of the structure of an autofocus lens provided by an embodiment of the present application, wherein the autofocus lens provided by an embodiment of the present application comprises: a first lens group 100, a stop 300 and a second lens group 200 arranged in sequence on the optical axis along the direction X from the object side to the image side, any one of the first lens group 100 and the second lens group 200 comprises at least one fixed focus lens. And at least one liquid lens 400 arranged on the optical axis, wherein the optical power D of the liquid lens 400 satisfies the condition: -15≤D≤15, and the position of the liquid lens 400 is different from that of the first lens group 100 and the second lens group 200, so that the focal length of the liquid lens 400 satisfies the respective corresponding conditions with the focal length of the first lens group 100, or with the focal length of the second lens group 200, or with the focal length of the autofocus lens. Wherein, the conversion of the optical power D to its focal length F is D=1000 / F.

[0059] As can be seen from the above content, the technical solution provided by the embodiment of the present application optimizes the position of the liquid lens 400 and the first lens group 100 and the second lens group 200, and optimizes the focal length of the liquid lens 400 and the focal length of the first lens group 100, or the focal length of the second lens group 200, or the focal length of the autofocus lens to meet the respective corresponding conditions, so that the autofocus lens can focus and image clearly as the shooting distance changes. In addition, the liquid lens can realize the zoom function without the need to use mechanical structure control such as a voice coil motor. Therefore, the use of the liquid lens 400 can not only improve the focus response speed of the autofocus lens, thereby realizing fast autofocus of the autofocus lens, but also reduce the volume of the autofocus lens, and facilitate the integration of optical devices and other equipment. In addition, the operation of the liquid lens 400 does not rely on mechanical movement, so the liquid lens 400 is more durable and less susceptible to mechanical wear, while simplifying the composition structure of the autofocus lens, reducing the complexity and manufacturing cost of the autofocus lens. In addition, the focal length D of the liquid lens 400 is limited, and the imaging clarity of the autofocus lens is improved in combination with the first lens group 100, the aperture 300 and the second lens group 200. Preferably, the focal length D of the liquid lens 400 provided in the embodiment of the present application satisfies the condition: -10≤D≤10, further improving the imaging clarity of the autofocus lens.

[0060] In some embodiments, the autofocus lens provided in the embodiments of the present application may include a liquid lens 400, wherein the liquid lens 400 can be arbitrarily arranged with the first lens group 100 and the second lens group 200, and the positions of the liquid lens 400 and the first lens group 100 and the second lens group 200 are different, so that the focal length of the liquid lens 400 and the focal length of the first lens group 100, or the focal length of the second lens group 200, or the focal length of the autofocus lens meet the respective corresponding conditions. Specifically, Figure 1 In the autofocus lens shown, the liquid lens 400 can be located before the first lens group 100, that is, the liquid lens 400 is located on the side of the first lens group 100 away from the second lens group 200, and the light enters the first lens group 100 after passing through the liquid lens 400. At this time, the focal length of the liquid lens 400 and the first lens group 100 meet the first preset condition. Or as Figure 2 As shown, it is a schematic diagram of the structure of another autofocus lens provided by an embodiment of the present application, wherein the liquid lens 400 is located between the first lens group 100 and the second lens group 200, and the optional liquid lens 400 is located between the aperture 300 and the second lens group 200. After the light passes through the first lens group 100, it is improved by the liquid lens 400 and then propagates to the second lens group 200. At this time, the focal length of the liquid lens 400 and the second lens group 200 meet the second preset condition. Or as Figure 3As shown, it is a structural schematic diagram of another autofocus lens provided in an embodiment of the present application, wherein the liquid lens 400 is located behind the second lens group 200, that is, the liquid lens 400 is located on the side of the second lens group 200 away from the first lens group 100, and the liquid lens 400 achieves focusing by adjusting the focal length. At this time, the focal length of the liquid lens 400 and the focal length of the autofocus lens meet the third preset condition.

[0061] like Figure 1 As shown, when the liquid lens 400 provided in the embodiment of the present application is located at the side of the first lens group 100 away from the second lens group 200, the focal length of the liquid lens 400 and the focal length of the first lens group 100 satisfy the following condition, that is, the first preset condition satisfied by the focal length of the liquid lens 400 and the focal length of the first lens group 100 at least includes:

[0062]

[0063] LFC is the focal length of the liquid lens 400 at a first object distance, LFL is the focal length of the liquid lens 400 at a second object distance, the second object distance is greater than the first object distance, and F1 is the focal length of the first lens group 100. The first object distance is the minimum close object distance applicable to the auto focus lens, and the second object distance is the maximum far object distance applicable to the auto focus lens.

[0064] like Figure 2 As shown, when the liquid lens 400 provided in the embodiment of the present application is located between the first lens group 100 and the second lens group 200, the liquid lens 400 may be located between the aperture 300 and the second lens group 200, wherein the focal length of the liquid lens 400 and the focal length of the second lens group 200 satisfy the following condition, that is, the focal length of the liquid lens 400 and the second lens group 200 satisfy the second preset condition:

[0065]

[0066] LFC is the focal length of the liquid lens 400 at a first object distance, LFL is the focal length of the liquid lens 400 at a second object distance, the second object distance is greater than the first object distance, and F2 is the focal length of the second lens group 200. The first object distance is the minimum close object distance applicable to the auto focus lens, and the second object distance is the maximum far object distance applicable to the auto focus lens.

[0067] like Figure 3As shown, the liquid lens 400 provided in the embodiment of the present application is located on the side of the second lens group 200 away from the first lens group 100, wherein the focal length of the liquid lens 400 and the focal length of the auto-focus lens meet the following conditions, that is, the focal length of the liquid lens 400 and the focal length of the auto-focus lens meet the third preset condition:

[0068]

[0069] LFC is the focal length of the liquid lens 400 at a first object distance, LFL is the focal length of the liquid lens 400 at a second object distance, the second object distance is greater than the first object distance, and EFL is the focal length of the auto-focus lens. The first object distance is the minimum close object distance applicable to the auto-focus lens, and the second object distance is the maximum far object distance applicable to the auto-focus lens.

[0070] In some embodiments, the first lens group 100 provided in the embodiments of the present application includes at least two fixed-focus lenses, and the at least two fixed-focus lenses are arranged in sequence on the optical axis; and / or, the second lens group 200 includes at least three fixed-focus lenses, and the at least three fixed-focus lenses are arranged in sequence on the optical axis. The specific composition structures of several auto-focus lenses provided in the embodiments of the present application are described in detail below in conjunction with the accompanying drawings (it should be noted that the following attached drawings are Figure 4 To Attachment Fig. 9 The aperture 300 is not shown in the figure).

[0071] Combination Figure 4 and Figure 5 As shown, Figure 4 and Figure 5 are schematic diagrams of structures of another autofocus lens provided in the embodiments of the present application, and Figure 4 This is the optical path diagram of the autofocus lens at the second object distance. Figure 5 The optical path diagram of the autofocus lens at the first object distance. The first lens group 100 provided in the embodiment of the present application includes: three fixed-focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the first lens 101, the second lens 102 and the third lens 103; and the second lens group 200 includes: five fixed-focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207 and the eighth lens 208; wherein the autofocus lens includes: a liquid lens 400 arranged on the optical axis, and the liquid lens 400 is located on the side of the first lens 101 away from the second lens 102.

[0072] Continue as Figure 4 and Figure 5As shown, the surface shapes of the front lens surface and the rear lens surface of the first lens 101 provided in the embodiment of the present application can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the second lens 102 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the third lens 103 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the fourth lens 204 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the fifth lens 205 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the sixth lens 206 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the seventh lens 207 can both be spherical surfaces, and the surface shapes of the front lens surface and the rear lens surface of the eighth lens 208 can both be spherical surfaces; and the surface shapes of the front lens surface and the rear lens surface of the liquid lens 400 can both be spherical surfaces. The liquid lens 400 provided in the embodiment of the present application is located in front of the first lens group 100, that is, the liquid lens 400 is located on the side of the first lens group 100 away from the second lens group 200, and at least the focal length of the liquid lens 400 and the focal length of the first lens group 100 satisfy the following conditions:

[0073]

[0074] Furthermore, when the liquid lens 400 provided in the embodiment of the present application is located before the first lens group 100, at least one of the focal length of the liquid lens 400 and the focal length of the second lens group 200, and the focal length of the liquid lens 400 and the focal length of the autofocus lens can also satisfy the following corresponding conditions:

[0075]

[0076] or combined Figure 6 and Figure 7 As shown, Figure 6 and Figure 7 are schematic diagrams of structures of another autofocus lens provided in the embodiments of the present application, and Figure 6 This is the optical path diagram of the autofocus lens at the second object distance. Figure 7 The optical path diagram of the autofocus lens at the first object distance. The first lens group 100 provided in the embodiment of the present application includes: three fixed-focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the first lens 101, the second lens 102 and the third lens 103; and the second lens group 200 includes: five fixed-focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207 and the eighth lens 208; the autofocus lens includes: a liquid lens 400 arranged on the optical axis, and the liquid lens 400 is located on the side of the eighth lens 208 away from the seventh lens 207.

[0077] Continue as Figure 6 and Figure 7 As shown, the surface shapes of the front lens surface and the rear lens surface of the first lens 101 provided in the embodiment of the present application can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the second lens 102 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the third lens 103 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the fourth lens 204 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the fifth lens 205 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the sixth lens 206 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the seventh lens 207 can both be spherical surfaces, and the surface shapes of the front lens surface and the rear lens surface of the eighth lens 208 can both be spherical surfaces; and the surface shapes of the front lens surface and the rear lens surface of the liquid lens 400 can both be spherical surfaces. The liquid lens 400 provided in the embodiment of the present application is located behind the second lens group 200, that is, the liquid lens 400 is located on the side of the second lens group 200 away from the first lens group 100, and at least the focal length of the liquid lens 400 and the focal length of the autofocus lens meet the following conditions:

[0078]

[0079] Furthermore, when the liquid lens 400 provided in the embodiment of the present application is located behind the second lens group 200, at least one of the focal length of the liquid lens 400 and the focal length of the first lens group 100, and the focal length of the liquid lens 400 and the focal length of the second lens group 200 may also satisfy the following corresponding conditions:

[0080]

[0081] or combined Figure 8 and Fig. 9 As shown, Figure 8 and Fig. 9 are schematic diagrams of structures of another autofocus lens provided in the embodiments of the present application, and Figure 8 This is the optical path diagram of the autofocus lens at the second object distance. Fig. 9 The optical path diagram of the auto-focus lens at the first object distance. The first lens group 100 provided in the embodiment of the present application includes: two fixed focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the ninth lens 109 and the tenth lens 1010; and the second lens group 200 includes: three fixed focus lenses arranged in sequence on the optical axis along the direction X from the object side to the image side are the eleventh lens 2011, the twelfth lens 2012 and the thirteenth lens 2013; the auto-focus lens includes: a liquid lens 400 arranged on the optical axis, and the liquid lens 400 is located between the aperture 300 and the eleventh lens 2011.

[0082] Continue as Figure 8 and Fig. 9As shown, the surface shapes of the front lens surface and the rear lens surface of the ninth lens 109 provided in the embodiment of the present application can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the tenth lens 1010 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the eleventh lens 2011 can both be spherical surfaces, the surface shapes of the front lens surface and the rear lens surface of the twelfth lens 2012 can both be spherical surfaces, and the surface shapes of the front lens surface and the rear lens surface of the thirteenth lens 2013 can both be spherical surfaces; and the surface shapes of the front lens surface and the rear lens surface of the liquid lens 400 can both be spherical surfaces. Among them, the liquid lens 400 provided in the embodiment of the present application is located between the first lens group 100 and the second lens group 200, and the liquid lens 400 can be located between the aperture 300 and the second lens group 200, and at least the focal length of the liquid lens 400 and the focal length of the second lens group 200 meet the following conditions:

[0083]

[0084] Furthermore, when the liquid lens 400 provided in the embodiment of the present application is located between the first lens group 100 and the second lens group 200, at least one of the focal lengths of the liquid lens 400 and the first lens group 100, and the focal length of the liquid lens 400 and the focal length of the autofocus lens can also satisfy the following corresponding conditions:

[0085]

[0086] In some embodiments, the liquid lens 400 provided in the embodiment of the present application may include: a transparent substrate and a transparent film that are arranged opposite to each other and form a cavity, wherein the cavity is used to fill a transparent liquid with a preset refractive index and a preset Abbe constant. The liquid lens 400 provided in the embodiment of the present application presents the characteristics of a convex lens or a concave lens as the volume of the transparent liquid increases or decreases. Fig.10 As shown, it is a schematic structural diagram of a transparent liquid injection device for a liquid lens provided in an embodiment of the present application, wherein the injection device includes a liquid injection slot 410 connected to the cavity of the liquid lens 400, and a push-pull assembly 420 that pushes and pulls the liquid injection slot 410 to inject the transparent liquid into the cavity, wherein the push-pull assembly 420 can control the transparent liquid to be injected into the cavity of the liquid lens 400 in a stepping manner, thereby realizing the volume change of the transparent liquid in the liquid lens 400, thereby changing the concavo-convexity of the liquid lens 400 itself, and finally realizing the change of the focal length of the liquid lens 400. Optionally, the preset refractive index provided in the embodiment of the present application is:

[0087] 1.2≤Nd1≤1.6,

[0088] And, the preset Abbe constant is:

[0089] 60≤Vd1≤110,

[0090] Nd1 is the preset refractive index, and Vd1 is the preset Abbe constant. In addition, the transparent substrate provided in the embodiment of the present application may be a protective glass, and the protective glass is optical glass HK9L.

[0091] It should be noted that the above Figures 4 to 9 The specific structures of the several autofocus lenses shown are only several of all the structures applicable to the optical focus lenses provided in the present application. In other embodiments of the present application, the first lens group 100 and the second lens group 200 may also include other numbers of fixed-focus lenses, and the present application does not make any specific limitation on this.

[0092] The following is a more detailed illustration of the effect of the autofocus lens provided by the embodiment of the present application, in combination with the specific data of the lens and the MTF diagram obtained after simulating the autofocus lens, wherein the unit of the physical quantity representing the distance shown in the table is millimeter. Figures 11 to 16 In the figure shown, Diffraction MTF represents the graph of diffraction modulation transfer function; the horizontal axis Spatial Frequency represents the spatial frequency, the unit is cycles / mm; the vertical axis Modulation represents modulation; F1:Diff.Limit represents the field diffraction limit; F1:(RIH)0.000mm represents the field under the condition of 0.000mm image plane height field of view. Diffraction data; T represents the tangential direction, R represents the sagittal direction, where F2: T (RIH) 0.400mm represents the diffraction data in the meridian direction under the condition of 0.400mm image plane height field of view, F2:R(RIH)0.400mm represents the diffraction data in the sagittal direction under the condition of 0.400mm image plane height field of view, and F3:T(RIH)0.800mm represents the diffraction data in the meridian direction under the condition of 0.800mm image plane height field of view, F3:R(RIH)0.800mm represents the diffraction data in the sagittal direction under the condition of 0.800mm image plane height field of view, and so on. In addition, Defocusing represents the focal plane position, Wavelenghth represents the wavelength (unit: nm), and Weight represents the weight, that is, the graph of the diffraction modulation transfer function is the data obtained by testing under the conditions of the corresponding light wavelength of the weight indicated in the diagram when the focal plane position is 0.000mm.

[0093] Combination Figure 4 , Figure 5 ,Table 1, Fig.11 and Fig.12 As shown in Table 1 Figure 4 and Figure 5The corresponding data of each fixed-focus lens when the illustrated liquid lens 400 is located before the first lens group 100, wherein "surface shape" is the surface shape of the front lens surface and the rear lens surface of each lens along the direction X from the object side to the image side, "distance" represents the thickness or spacing of the fixed-focus lens, "(near)" is the data parameter at the first object distance, "(far)" is the data parameter at the second object distance, "inf" is infinity, Nd is the refractive index, and Vd is the Abbe constant. And, Fig.11 This is the MTF diagram of the autofocus lens at the second object distance. Fig.12 This is the MTF diagram of the autofocus lens at the first object distance.

[0094]

[0095] Table 1

[0096] Combined with the data parameters shown in Table 1, the embodiment of the present application provides LFL=-732.26, LFC=1658.66, F1=92, F2=13, and EFL=21.33. Among them:

[0097] is inf, is inf, is inf.

[0098] Combination Figure 6 , Figure 7 ,Table 2, Fig.13 and Fig.14 As shown in Table 2 Figure 6 and Figure 7 The corresponding data of each fixed-focus lens when the illustrated liquid lens 400 is located after the second lens group 200, wherein "surface shape" is the surface shape of the front lens surface and the rear lens surface of each lens along the direction X from the object side to the image side, "distance" represents the thickness or spacing of the fixed-focus lens, "(near)" is the data parameter at the first object distance, "(far)" is the data parameter at the second object distance, "inf" is infinity, Nd is the refractive index, and Vd is the Abbe constant. And, Fig.13 This is the MTF diagram of the autofocus lens at the second object distance. Fig.14 This is the MTF diagram of the autofocus lens at the first object distance.

[0099]

[0100] Table 2

[0101] Combined with the data parameters shown in Table 2, the embodiment of the present application provides LFL=-732.26, LFC=1658.66, F1=92, F2=13, EFL=21.33. Among them:

[0102] is 10.1, is 70.1, It is 43.4.

[0103] Combination Figure 8 , Fig. 9 , Table 3, Fig.15 and Fig.16 As shown in Table 3 Figure 8 and Fig. 9 The corresponding data of each fixed-focus lens when the illustrated liquid lens 400 is located between the first lens group 100 and the second lens group 200, wherein "surface shape" is the surface shape of the front lens surface and the rear lens surface of each lens along the direction X from the object side to the image side, "distance" represents the thickness or spacing of the fixed-focus lens, "(near)" is the data parameter at the first object distance, "(far)" is the data parameter at the second object distance, and "inf" is infinity. And, Fig.15 This is the MTF diagram of the autofocus lens at the second object distance. Fig.16 This is the MTF diagram of the autofocus lens at the first object distance.

[0104]

[0105] Table 3

[0106] Combined with the data parameters shown in Table 3, the embodiment of the present application provides LFL=-744.7, LFC=966.6, F1=-20.51, F2=12.16, EFL=21.0. Among them:

[0107] is 10.8, is 18.2, It is 10.5.

[0108] Based on the same inventive concept, an embodiment of the present application further provides an optical device, which includes the autofocus lens provided by any one of the above embodiments.

[0109] An embodiment of the present application provides an autofocus lens and an optical device, wherein the autofocus lens comprises: a first lens group, a stop, and a second lens group, which are sequentially arranged on an optical axis along a direction from an object side to an image side, wherein any one of the first lens group and the second lens group comprises at least one fixed-focus lens; and at least one liquid lens arranged on the optical axis, wherein the position of the liquid lens is different from that of the first lens group and the second lens group, so that the focal length of the liquid lens satisfies respective corresponding conditions with the focal length of the first lens group, or with the focal length of the second lens group, or with the focal length of the autofocus lens.

[0110] As can be seen from the above content, the technical solution provided by the embodiment of the present application optimizes the position of the liquid lens and the first lens group and the second lens group, and optimizes the focal length of the liquid lens and the focal length of the first lens group, or the focal length of the second lens group, or the focal length of the autofocus lens to meet the respective corresponding conditions, so that the autofocus lens can focus and image clearly as the shooting distance changes. In addition, the liquid lens can achieve the zoom function without the need to use mechanical structure control such as a voice coil motor, so the use of a liquid lens can not only improve the focus response speed of the autofocus lens, but also reduce the size of the autofocus lens.

[0111] In the description of the embodiments of the present application, it needs to be understood that the orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0112] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0113] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0114] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0115] In the embodiments of the present application, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0116] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An autofocus lens, characterized in that: The autofocus lens comprises: A first lens group, a stop, and a second lens group are sequentially arranged along the direction from the object side to the image side and on the optical axis, wherein any one of the first lens group and the second lens group includes at least one fixed-focus lens; And, at least one liquid lens is arranged on the optical axis, wherein the optical focal length D of the liquid lens satisfies the condition: -15≤D≤15, and the position of the liquid lens is different from that of the first lens group and the second lens group, so that the focal length of the liquid lens satisfies the respective corresponding conditions with the focal length of the first lens group, or with the focal length of the second lens group, or with the focal length of the autofocus lens.

2. The autofocus lens according to claim 1, characterized in that: The liquid lens is located on a side of the first lens group away from the second lens group, wherein the focal length of the liquid lens and the focal length of the first lens group satisfy the following conditions: LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and F1 is the focal length of the first lens group.

3. The autofocus lens according to claim 1, wherein: The liquid lens is located between the first lens group and the second lens group, wherein the focal length of the liquid lens and the focal length of the second lens group satisfy the following conditions: LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and F2 is the focal length of the second lens group.

4. The autofocus lens according to claim 1, wherein: The liquid lens is located on a side of the second lens group away from the first lens group, wherein the focal length of the liquid lens and the focal length of the autofocus lens satisfy the following conditions: LFC is the focal length of the liquid lens at a first object distance, LFL is the focal length of the liquid lens at a second object distance, the second object distance is greater than the first object distance, and EFL is the focal length of the autofocus lens.

5. The autofocus lens according to claim 1, wherein: The first lens group includes at least two fixed-focus lenses, and the at least two fixed-focus lenses are arranged sequentially on the optical axis; And / or, the second lens group includes at least three fixed-focus lenses, and the at least three fixed-focus lenses are arranged sequentially on the optical axis.

6. The autofocus lens according to claim 5, characterized in that: The first lens group includes: three fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, a first lens, a second lens and a third lens; And, the second lens group includes: five fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; Wherein, the autofocus lens comprises: a liquid lens arranged on the optical axis, the liquid lens is located on a side of the first lens away from the second lens; or, the liquid lens is located on a side of the eighth lens away from the seventh lens.

7. The autofocus lens according to claim 5, characterized in that: The first lens group includes: two fixed focus lenses, namely a ninth lens and a tenth lens, which are sequentially arranged along the direction from the object side to the image side and on the optical axis; And, the second lens group includes: three fixed focus lenses arranged in sequence along the direction from the object side to the image side and on the optical axis, namely, an eleventh lens, a twelfth lens and a thirteenth lens; Wherein, the autofocus lens comprises: a liquid lens arranged on the optical axis, and the liquid lens is located between the aperture and the eleventh lens.

8. The autofocus lens according to claim 1, wherein: The liquid lens comprises: A transparent substrate and a transparent film are arranged opposite to each other and form a cavity, wherein the cavity is used to fill a transparent liquid with a preset refractive index and a preset Abbe constant.

9. The autofocus lens according to claim 8, characterized in that: The preset refractive index is: 1.2≤Nd1≤1.6, And, the preset Abbe constant is: 60≤Vd1≤110, Nd1 is the preset refractive index, and Vd1 is the preset Abbe constant.

10. An optical device, characterized in that: The optical device comprises the autofocus lens according to any one of claims 1 to 9.

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