Automatic focusing lens and optical device
By optimizing the position and focal length of the liquid lens in the autofocus lens, the problems of slow response speed and large size in the prior art have been solved, realizing fast focusing and miniaturized lens design, improving image clarity and device integration.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-24
- Publication Date
- 2026-03-03
AI Technical Summary
Existing autofocus lenses have low response speeds and large sizes. The mechanical control structure causes the lens to respond slowly when focusing and requires reserved space, which affects the user experience and the overall size of the device.
By optimizing the position of the liquid lens with the first and second lens groups, and by satisfying specific conditions through the optical power and focal length of the liquid lens, fast focusing of the autofocus lens is achieved, reducing reliance on mechanical structures.
It improves the focusing response speed of autofocus lenses, reduces the size of lenses, improves image clarity, simplifies the structure, and reduces manufacturing costs.
Smart Images
Figure CN223966758U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of optical element technology, and more specifically, to an autofocus lens and optical device. Background Technology
[0002] With the development of optical lenses, various types of optical lenses for different purposes have emerged on the market. Optical lenses require refocusing in different scenarios, and today's applications are divided into manual focus and autofocus. Autofocus is the mainstream focusing method, specifically using a voice coil motor to drive the lens or lens element to achieve focusing. This autofocus method uses a mechanical control structure to effectively achieve clear image imaging, while also incorporating software control for precise focusing. However, due to the mechanical control structure, the lens's focusing response speed is relatively low, easily noticeable to the user; furthermore, mechanical focusing is achieved by moving the lens, requiring sufficient space for focusing during lens movement, resulting in a larger overall size of the optical device. Utility Model Content
[0003] In view of this, this application provides an autofocus lens and optical device, which effectively solves the technical problems existing in the prior art. Under the condition that the autofocus lens can achieve clear focusing and imaging as the shooting distance changes, the use of 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 solution provided in this application is as follows:
[0005] An autofocus lens, the autofocus lens comprising:
[0006] A first lens group, an aperture stop, and a second lens group are arranged sequentially along the optical axis from the object side to the image side, wherein either the first lens group or the second lens group includes at least one fixed-focus lens;
[0007] In addition, at least one liquid lens is disposed on the optical axis, wherein the optical power D of the liquid lens satisfies the condition: -15≤D≤15, and the liquid lens is positioned differently from the first lens group and the second lens group, such that the focal length of the liquid lens satisfies the respective conditions of 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.
[0008] Optionally, the liquid lens is located on the side of the first lens group opposite to the second lens group, wherein the focal length of the liquid lens and the focal length of the first lens group satisfy the following condition:
[0009]
[0010] LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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 condition:
[0012]
[0013] LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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 the side of the second lens group opposite to the first lens group, wherein the focal length of the liquid lens and the focal length of the autofocus lens satisfy the following condition:
[0015]
[0016] LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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 sequentially along the optical axis from the object side to the image side: a first lens, a second lens, and a third lens.
[0020] Furthermore, the second lens group includes five fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens.
[0021] The autofocus lens includes: a liquid lens disposed on the optical axis, the liquid lens being located on the side of the first lens opposite to the second lens; or, the liquid lens being located on the side of the eighth lens opposite to the seventh lens. Optionally, the first lens group includes: two fixed-focus lenses, a ninth lens and a tenth lens, sequentially disposed on the optical axis along the object-to-image direction;
[0022] Furthermore, the second lens group includes three fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: the eleventh lens, the twelfth lens, and the thirteenth lens.
[0023] The autofocus lens includes a liquid lens disposed on the optical axis, the liquid lens being located between the aperture stop and the eleventh lens.
[0024] Optionally, the liquid lens includes:
[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, this application also provides an optical device, which includes the above-described autofocus lens.
[0032] Compared with existing technologies, the technical solution provided in this application has at least the following advantages:
[0033] This application provides an autofocus lens and optical device. The autofocus lens includes: a first lens group, an aperture stop, and a second lens group arranged sequentially along the optical axis from the object side to the image side, wherein either the first lens group or the second lens group includes at least one fixed-focus lens; and at least one liquid lens disposed on the optical axis, wherein the optical power D of the liquid lens satisfies the condition: -15≤D≤15, and the liquid lens is positioned differently from the first lens group and the second lens group, such that the focal length of the liquid lens satisfies the corresponding conditions of the focal length of the first lens group, the focal length of the second lens group, or the focal length of the autofocus lens.
[0034] As described above, the technical solution provided in this application optimizes the positions of the liquid lens and the first and second lens groups, and optimizes the focal length of the liquid lens to meet the corresponding conditions of the focal length of the first lens group, the second lens group, or the autofocus lens, enabling the autofocus lens to achieve clear focusing and imaging as the shooting distance changes. Furthermore, the liquid lens can achieve zoom functionality without the need for mechanical structures such as voice coil motors; therefore, using a liquid lens not only improves the focusing response speed of the autofocus lens but also reduces its size. In addition, limiting the optical power of the liquid lens, in conjunction with the first lens group, aperture stop, and second lens group, improves the imaging sharpness of the autofocus lens. Attached Figure Description
[0035] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0036] Figure 1 This is a schematic diagram of the structure of an autofocus lens provided in an embodiment of this application;
[0037] Figure 2 This is a schematic diagram of another autofocus lens provided in an embodiment of this application;
[0038] Figure 3 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0039] Figure 4 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0040] Figure 5 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0041] Figure 6 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0042] Figure 7 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0043] Figure 8 A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0044] Figure 9A schematic diagram of the structure of another autofocus lens provided in the embodiments of this application;
[0045] Figure 10 This is a schematic diagram of a transparent liquid injection device for a liquid lens, provided in an embodiment of this application.
[0046] Figure 11 An MTF diagram of an autofocus lens at a second object distance is provided for an embodiment of this application;
[0047] Figure 12 An MTF diagram of an autofocus lens at a first object distance is provided for an embodiment of this application;
[0048] Figure 13 Another MTF diagram of an autofocus lens at a second object distance, provided as an embodiment of this application;
[0049] Figure 14 Another MTF diagram of an autofocus lens at a first object distance, provided in an embodiment of this application;
[0050] Figure 15 Another MTF diagram of an autofocus lens at a second object distance is provided in the embodiments of this application;
[0051] Figure 16 This is an MTF diagram of another autofocus lens provided in an embodiment of this application at a first object distance.
[0052] Figure label:
[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 tank; 420 - Push-pull assembly. Detailed Implementation
[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0055] As described in the background section, with the development of optical lenses, various types of optical lenses for different applications have emerged on the market. Optical lenses require refocusing in different scenarios, and current applications categorize them into manual focus and autofocus. Autofocus is the mainstream focusing method, specifically using a voice coil motor to drive the lens or lens element to achieve focusing. This autofocus method uses a mechanically controlled structure to effectively achieve clear image imaging, while software control enables precise focusing. However, due to the mechanical control structure, the lens's focusing response speed is relatively low, easily noticeable to the user; furthermore, mechanical focusing is achieved by moving the lens, requiring sufficient space for focusing during lens movement, resulting in a larger overall size of the optical device.
[0056] Based on this, the embodiments of this application provide an autofocus lens and optical device, which effectively solves the technical problems existing in the prior art. Under the condition that the autofocus lens can achieve clear focusing and imaging as the shooting distance changes, the use of 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 objectives, the technical solutions provided in this application are as follows, in specific combination with... Figures 1 to 16 The technical solutions provided in the embodiments of this application will be described in detail.
[0058] refer to Figure 1 The diagram shows a schematic of an autofocus lens according to an embodiment of this application. The autofocus lens includes: a first lens group 100, an aperture stop 300, and a second lens group 200 sequentially arranged along the optical axis from the object side to the image side (X). Each of the first lens group 100 and the second lens group 200 includes at least one fixed-focus lens. At least one liquid lens 400 is disposed on the optical axis. The optical power D of the liquid lens 400 satisfies the condition -15 ≤ D ≤ 15. The liquid lens 400 is positioned differently from the first lens group 100 and the second lens group 200, such that the focal length of the liquid lens 400 satisfies the corresponding conditions of the focal length of the first lens group 100, the second lens group 200, or the autofocus lens. The conversion between the optical power D and its focal length F is D = 1000 / F.
[0059] As can be seen from the above, the technical solution provided in this application optimizes the positions of the liquid lens 400, the first lens group 100, and the second lens group 200, and optimizes the focal length of the liquid lens 400 to meet the corresponding conditions of the focal length of the first lens group 100, the second lens group 200, or the autofocus lens, so that the autofocus lens can achieve clear focusing and imaging as the shooting distance changes. Furthermore, the liquid lens can achieve zoom function without the need for mechanical structures such as voice coil motors. Therefore, using the liquid lens 400 not only improves the focusing response speed of the autofocus lens, thereby achieving fast autofocus, but also reduces the size of the autofocus lens, facilitating integration with optical components and other devices. In addition, the operation of the liquid lens 400 does not rely on mechanical movement, making it more durable and less susceptible to mechanical wear, while simplifying the composition of the autofocus lens and reducing its complexity and manufacturing cost. Furthermore, by limiting the optical power D of the liquid lens 400, and in conjunction with the first lens group 100, the aperture stop 300, and the second lens group 200, the imaging sharpness of the autofocus lens is improved. Preferably, the optical power D of the liquid lens 400 provided in this embodiment satisfies the condition: -10 ≤ D ≤ 10, further improving the imaging sharpness of the autofocus lens.
[0060] In some embodiments, the autofocus lens provided in this 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 different positions of the liquid lens 400 with the first lens group 100 and the second lens group 200 satisfy their respective corresponding conditions. Specifically, as follows... Figure 1 In the autofocus lens shown, the liquid lens 400 can be 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. After the light is improved by the liquid lens 400, it enters the first lens group 100. At this time, the focal length of the liquid lens 400 and the first lens group 100 satisfy the first preset condition. Or as... Figure 2 The diagram shown illustrates another autofocus lens provided in this application embodiment. The liquid lens 400 is located between the first lens group 100 and the second lens group 200. Optionally, the liquid lens 400 is located between the aperture stop 300 and the second lens group 200. After light passes through the first lens group 100, it is improved by the liquid lens 400 before propagating into the second lens group 200. At this time, the focal length of the liquid lens 400 and the second lens group 200 satisfy a second preset condition. Alternatively, as shown... Figure 3The diagram shown is a structural schematic of another autofocus lens provided in this application embodiment. The liquid lens 400 is located after 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. 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 in the embodiment of this application, when the liquid lens 400 is located on 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 includes at least:
[0062]
[0063] LFC is the focal length of the liquid lens 400 at the first object distance, LFL is the focal length of the liquid lens 400 at the second object distance, where 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 autofocus lens, while the second object distance is the maximum far object distance applicable to the autofocus lens.
[0064] like Figure 2 As shown, when the liquid lens 400 provided in this embodiment is located between the first lens group 100 and the second lens group 200, optionally when the liquid lens 400 is located between the aperture stop 300 and the second lens group 200, 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 a second preset condition:
[0065]
[0066] LFC is the focal length of the liquid lens 400 at the first object distance, LFL is the focal length of the liquid lens 400 at the second object distance, where 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 autofocus lens, while the second object distance is the maximum far object distance applicable to the autofocus lens.
[0067] like Figure 3As shown in the embodiment of this application, the liquid lens 400 is located on the side of the second lens group 200 opposite to the first lens group 100. The focal length of the liquid lens 400 and the focal length of the autofocus lens satisfy the following condition: that is, the focal length of the liquid lens 400 and the focal length of the autofocus lens satisfy a third preset condition.
[0068]
[0069] LFC is the focal length of the liquid lens 400 at the first object distance, LFL is the focal length of the liquid lens 400 at the second object distance, where the second object distance is greater than the first object distance, and EFL is the focal length of the autofocus lens. The first object distance is the minimum close object distance applicable to the autofocus lens, while the second object distance is the maximum far object distance applicable to the autofocus lens.
[0070] In some embodiments, the first lens group 100 provided in this application includes at least two fixed-focus lenses, and the at least two fixed-focus lenses are sequentially arranged 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 sequentially arranged on the optical axis. The specific composition and structure of several autofocus lenses provided in this application embodiment are described in detail below with reference to the accompanying drawings (it should be noted that the following is attached...). Figure 4 To be continued Figure 9 (Aperture 300 not shown in the image).
[0071] Combination Figure 4 and Figure 5 As shown, Figure 4 and Figure 5 These are all schematic diagrams of another autofocus lens provided in the embodiments of this application, and Figure 4 This is the optical path diagram of the autofocus lens at the second object distance. Figure 5 This is the optical path diagram of the autofocus lens at the first object distance. The first lens group 100 provided in this application embodiment includes three fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a first lens 101, a second lens 102, and a third lens 103; and the second lens group 200 includes five fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, and an eighth lens 208; wherein the autofocus lens includes a liquid lens 400 disposed on the optical axis, the liquid lens 400 being located on the side of the first lens 101 opposite to the second lens 102.
[0072] Continue as Figure 4 and Figure 5As shown, the front and rear lens surfaces of the first lens 101, the second lens 102, the third lens 103, the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207, and the eighth lens 208 are all spherical; and the liquid lens 400 is also spherical. In this embodiment, the liquid lens 400 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 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 this application embodiment is located in front of 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 combination Figure 6 and Figure 7 As shown, Figure 6 and Figure 7 These are all schematic diagrams of another autofocus lens provided in the embodiments of this application, and Figure 6 This is the optical path diagram of the autofocus lens at the second object distance. Figure 7 This is the optical path diagram of the autofocus lens at the first object distance. Specifically, the first lens group 100 provided in this embodiment includes three fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a first lens 101, a second lens 102, and a third lens 103; and the second lens group 200 includes five fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a fourth lens 204, a fifth lens 205, a sixth lens 206, a seventh lens 207, and an eighth lens 208; wherein the autofocus lens includes a liquid lens 400 disposed on the optical axis, the liquid lens 400 being located on the side of the eighth lens 208 opposite to the seventh lens 207.
[0077] Continue as Figure 6 and Figure 7 As shown, the front and rear lens surfaces of the first lens 101, the second lens 102, the third lens 103, the fourth lens 204, the fifth lens 205, the sixth lens 206, the seventh lens 207, and the eighth lens 208 are all spherical; and the liquid lens 400 is also spherical. In this embodiment, the liquid lens 400 is located after 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. At least the focal length of the liquid lens 400 and the focal length of the autofocus lens satisfy the following conditions:
[0078]
[0079] Furthermore, when the liquid lens 400 provided in this application embodiment is located after 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, can also satisfy the following corresponding conditions:
[0080]
[0081] Or combination Figure 8 and Figure 9 As shown, Figure 8 and Figure 9 These are all schematic diagrams of another autofocus lens provided in the embodiments of this application, and Figure 8 This is the optical path diagram of the autofocus lens at the second object distance. Figure 9 This is the optical path diagram of the autofocus lens at the first object distance. Specifically, the first lens group 100 provided in this embodiment includes two fixed-focus lenses, a ninth lens 109 and a tenth lens 1010, arranged sequentially along the optical axis from the object side to the image side (X); and the second lens group 200 includes three fixed-focus lenses, an eleventh lens 2011, a twelfth lens 2012, and a thirteenth lens 2013, arranged sequentially along the optical axis from the object side to the image side (X); wherein the autofocus lens includes a liquid lens 400 disposed on the optical axis, the liquid lens 400 being located between the aperture stop 300 and the eleventh lens 2011.
[0082] Continue as Figure 8 and Figure 9As shown, the front and rear lens surfaces of the ninth lens 109, the tenth lens 1010, the eleventh lens 2011, the twelfth lens 2012, and the thirteenth lens 2013, as well as the liquid lens 400, are all spherical. The liquid lens 400 is located between the first lens group 100 and the second lens group 200. Optionally, the liquid lens 400 is located between the aperture stop 300 and the second lens group 200. At least the focal length of the liquid lens 400 and the focal length of the second lens group 200 satisfy the following conditions:
[0083]
[0084] Furthermore, when the liquid lens 400 provided in this application embodiment 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 lengths of the liquid lens 400 and the autofocus lens, can also satisfy the following corresponding conditions:
[0085]
[0086] In some embodiments, the liquid lens 400 provided in this application may include: a transparent substrate and a transparent film disposed opposite to each other and forming 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 this application exhibits the characteristics of a convex or concave lens as the volume of the transparent liquid increases or decreases. Figure 10 The diagram shown is a schematic representation of a transparent liquid injection device for a liquid lens according to an embodiment of this application. The injection device includes a liquid injection tank 410 communicating with the cavity of the liquid lens 400, and a push-pull assembly 420 that injects transparent liquid into the cavity by pushing and pulling the liquid injection tank 410. The push-pull assembly 420 can control the injection of transparent liquid into the cavity of the liquid lens 400 in a step-by-step manner, thereby changing the volume of the transparent liquid in the liquid lens 400, thus altering the concavity and convexity of the liquid lens 400, and ultimately changing the focal length of the liquid lens 400. Optionally, the preset refractive index provided in this embodiment 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. Furthermore, the transparent substrate provided in this embodiment can be protective glass, specifically optical glass HK9L.
[0091] It should be noted that the above Figures 4 to 9 The specific structures of the autofocus lenses shown are only a few of the structures applicable to all optical focusing lenses provided in this application. In other embodiments of this application, the first lens group 100 and the second lens group 200 may also include other numbers of fixed-focus lenses, and this application does not impose specific limitations on this.
[0092] The following provides a more detailed illustration of the effect of the autofocus lens provided in this application embodiment, using specific lens data and an MTF chart obtained after simulating the autofocus lens. The units for the physical quantities representing distance shown in the tables are millimeters. Figures 11 to 16 In the attached figure, Diffraction MTF represents a graph of the diffraction modulation transfer function; the horizontal axis represents Spatial. Frequency represents spatial frequency, measured in cycles / mm; the vertical axis represents modulation; F1: Diff.Limit represents the field-of-view diffraction limit; F1:(RIH)0.000mm represents diffraction data at a field of view at an image height of 0.000mm; T represents the tangential direction, and R represents the sagittal direction. Specifically, F2:T(RIH)0.400mm represents the tangential diffraction data at a field of view at an image height of 0.400mm, F2:R(RIH)0.400mm represents the sagittal diffraction data at a field of view at an image height of 0.400mm, and so on. Similarly, F3:T(RIH)0.800mm represents the tangential diffraction data at a field of view at an image height of 0.800mm, F3:R(RIH)0.800mm represents the sagittal diffraction data at a field of view at an image height of 0.800mm, and so on. In addition, Defocusing represents the focal plane position, Wavelength 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 corresponding light wavelength conditions with the weight shown in the graph when the focal plane position is 0.000 mm.
[0093] Combination Figure 4 , Figure 5 Table 1 Figure 11 and Figure 12 As shown, Table 1 is Figure 4 and Figure 5The data shown is for each fixed-focus lens when the liquid lens 400 is positioned in front of the first lens group 100. Here, "surface shape" refers to the surface shape of the front and rear lens surfaces of each lens along the direction X from the object side to the image side; "distance" indicates the thickness or spacing of the fixed-focus lenses; "(near)" is the data parameter for the first object distance; "(far)" is the data parameter for the second object distance; "inf" is infinity; Nd is the refractive index; and Vd is the Abbe constant. Figure 11 This is the MTF chart for an autofocus lens at the second object distance. Figure 12 This is the MTF chart of the autofocus lens at the first object distance.
[0094]
[0095] Table 1
[0096] Referring to the data parameters shown in Table 1, the embodiments of this application provide LFL = -732.26, LFC = 1658.66, F1 = 92, F2 = 13, and EFL = 21.33. Wherein:
[0097] For inf, For inf, It is an inf.
[0098] Combination Figure 6 , Figure 7 Table 2 Figure 13 and Figure 14 As shown, Table 2 is Figure 6 and Figure 7 The diagram shows the corresponding data for each fixed-focus lens when the liquid lens 400 is located after the second lens group 200. Here, "surface shape" refers to the surface shape of the front and rear lens surfaces of each lens along the direction X from the object side to the image side; "distance" indicates the thickness or spacing of the fixed-focus lenses; "(near)" is the data parameter for the first object distance; "(far)" is the data parameter for the second object distance; "inf" is infinity; Nd is the refractive index; and Vd is the Abbe constant. Figure 13 This is the MTF chart for an autofocus lens at the second object distance. Figure 14 This is the MTF chart of the autofocus lens at the first object distance.
[0099]
[0100] Table 2
[0101] Referring to the data parameters illustrated in Table 2, the embodiments of this application provide LFL = -732.26, LFC = 1658.66, F1 = 92, F2 = 13, and EFL = 21.33. Wherein:
[0102] It is 10.1. It is 70.1. It is 43.4.
[0103] Combination Figure 8 , Figure 9 Table 3 Figure 15 and Figure 16 As shown, Table 3 is Figure 8 and Figure 9 The data shown is for each fixed-focus lens when the liquid lens 400 is located between the first lens group 100 and the second lens group 200. Here, "surface shape" refers to the surface shape of the front and rear lens surfaces of each lens along the direction X from the object side to the image side; "distance" indicates the thickness or spacing of the fixed-focus lenses; "(near)" is the data parameter for the first object distance; "(far)" is the data parameter for the second object distance; and "inf" represents infinity. Figure 15 This is the MTF chart for an autofocus lens at the second object distance. Figure 16 This is the MTF chart of the autofocus lens at the first object distance.
[0104]
[0105] Table 3
[0106] Referring to the data parameters illustrated in Table 3, the embodiments of this application provide LFL = -744.7, LFC = 966.6, F1 = -20.51, F2 = 12.16, and EFL = 21.0. Wherein:
[0107] It is 10.8. It is 18.2. It is 10.5.
[0108] Based on the same inventive concept, this application also provides an optical device, which includes the autofocus lens provided in any of the above embodiments.
[0109] This application provides an autofocus lens and optical device. The autofocus lens includes: a first lens group, an aperture stop, and a second lens group arranged sequentially along the optical axis from the object side to the image side, wherein either the first lens group or the second lens group includes at least one fixed-focus lens; and at least one liquid lens disposed on the optical axis, wherein the liquid lens is positioned differently from the first lens group and the second lens group, such that the focal length of the liquid lens satisfies the respective conditions of the focal length of the first lens group, the focal length of the second lens group, or the focal length of the autofocus lens.
[0110] As can be seen from the above, the technical solution provided in this application optimizes the positions of the liquid lens and the first and second lens groups, and optimizes the focal length of the liquid lens to meet the corresponding conditions of the focal length of the first lens group, or the second lens group, or the autofocus lens, so that the autofocus lens can achieve clear focusing and imaging as the shooting distance changes. Furthermore, the liquid lens can achieve zoom function without the need for mechanical structures such as voice coil motors; therefore, using a liquid lens not only improves the focusing response speed of the autofocus lens but also reduces its size.
[0111] In the description of the embodiments of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and other terms indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of embodiments of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0113] In the embodiments of this application, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0114] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0115] In the embodiments of this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions 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 suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0116] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.
Claims
1. An autofocus lens, characterized in that, The autofocus lens includes: A first lens group, an aperture stop, and a second lens group are arranged sequentially along the optical axis from the object side to the image side, wherein either the first lens group or the second lens group includes at least one fixed-focus lens; In addition, at least one liquid lens is disposed on the optical axis, wherein the optical power D of the liquid lens satisfies the condition: -15≤D≤15, and the liquid lens is positioned differently from the first lens group and the second lens group, such that the focal length of the liquid lens satisfies the respective conditions of 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.
2. The autofocus lens according to claim 1, characterized in that, The liquid lens is located on the 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 condition: LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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, characterized in that, 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 condition: LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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, characterized in that, The liquid lens is located on the side of the second lens group opposite to the first lens group, wherein the focal length of the liquid lens and the focal length of the autofocus lens satisfy the following condition: LFC is the focal length of the liquid lens at the first object distance, LFL is the focal length of the liquid lens at the 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, characterized in that, 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 sequentially along the optical axis from the object side to the image side: a first lens, a second lens, and a third lens. Furthermore, the second lens group includes five fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The autofocus lens includes: a liquid lens disposed on the optical axis, the liquid lens being located on the side of the first lens away from the second lens; or, the liquid lens being located on the 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 the ninth lens and the tenth lens, arranged sequentially along the optical axis from the object side to the image side. Furthermore, the second lens group includes three fixed-focus lenses arranged sequentially along the optical axis from the object side to the image side: the eleventh lens, the twelfth lens, and the thirteenth lens. The autofocus lens includes a liquid lens disposed on the optical axis, the liquid lens being located between the aperture stop and the eleventh lens.
8. The autofocus lens according to claim 1, characterized in that, The liquid lens includes: 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 includes the autofocus lens as described in any one of claims 1-9.