Large-target-surface periscopic continuous zooming optical lens and mobile phone

Abstract

The invention discloses a large-target-surface periscopic continuous zooming optical lens and a mobile phone. The optical lens comprises a lens main body, and the lens main body comprises a lens barrel, and a fixed lens group, a zoom lens group and a compensation lens group which are arranged in the lens barrel. The fixed lens group comprises a turning prism and a first lens group with negative focal power; the zoom lens group comprises a second lens group with positive focal power; the compensation lens group comprises a third lens group and a fourth lens group; the first lens group, the second lens group, the third lens group and the fourth lens group are sequentially arranged from front to back, and the second lens group, the third lens group and the fourth lens group are movably arranged in the front-back direction relative to the lens barrel. According to the technical scheme, the installation and application requirements of the lens main body in electronic equipment with an imaging function and relatively thin thickness, such as a mobile phone, are effectively met, and the technical problem that a traditional lens is difficult to adapt to light and thin electronic equipment is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a large-surface periscope continuous zoom optical lens and a mobile phone. Background Art

[0002] With the continuous innovation of mobile imaging technology, users have high demands on smartphone shooting performance, including large zoom, high-resolution imaging, large target area, and consistent image quality across all focal lengths. However, traditional single-focal-length lenses combined with digital zoom solutions rely on image cropping and pixel interpolation, resulting in loss of image details and reduced resolution. Although mainstream hybrid optical zoom technology expands the focal length coverage by combining multiple fixed-focus lenses, there are problems with image clarity discontinuity in the focal length switching range, which affects zoom smoothness and picture continuity. Although optical continuous zoom technology can achieve smooth focal length transition through the coordinated displacement of lens groups, solving the imaging discontinuity problem, its large axial size conflicts with the ultra-thin body design of smartphones, making it difficult to effectively integrate. How to balance large zoom capabilities with large target area and high-quality imaging within a limited space has become a key technical bottleneck that urgently needs to be broken through in the current mobile imaging field. Summary of the Invention

[0003] The main purpose of the present invention is to provide a large-surface periscope continuous zoom optical lens and a mobile phone, aiming to improve the shooting quality of the zoom lens.

[0004] To achieve the purpose of the present invention, the technical solution provided by the present invention is as follows:

[0005] First aspect

[0006] The present invention provides a large-area periscope continuous zoom optical lens, comprising a lens body, wherein the direction from the object side to the image side along the optical axis of the lens body is from front to back;

[0007] The lens body includes a lens barrel and a fixed lens group, a variable magnification lens group and a compensation lens group arranged in the lens barrel;

[0008] The fixed lens group includes a turning prism and a first lens group with negative optical power; the variable power lens group includes a second lens group with positive optical power; the compensating lens group includes a third lens group and a fourth lens group;

[0009] The first lens group, the second lens group, the third lens group and the fourth lens group are arranged in sequence from front to back, and the second lens group, the third lens group and the fourth lens group are movably arranged in the front-to-back direction relative to the lens barrel.

[0010] The first lens group is a fixed lens group, and has negative optical power;

[0011] The second lens group has positive optical power;

[0012] The third lens group has positive optical power;

[0013] The fourth lens group has negative optical power;

[0014] The focal length of the first lens group is f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, the focal length of the fourth lens group is f4, the distance between the first lens group and the second lens group at the wide-angle end is dw12, the distance between the first lens group and the second lens group at the telephoto end is dt12, the distance between the second lens group and the third lens group at the wide-angle end is dw23, and the distance between the second lens group and the third lens group at the telephoto end is dt23. The distance between the third lens group and the fourth lens group at the wide-angle end is dw34, the distance between the third lens group and the fourth lens group at the telephoto end is dt34, the distance between the third lens group and the fourth lens group at the wide-angle end is dw34, the distance between the third lens group and the fourth lens group at the telephoto end is dt34, the distance between the fourth lens group and the image side at the wide-angle end is dw45, and the distance between the fourth lens group and the image side at the telephoto end is dt45, satisfying the following relationship: -30mm <f1<-25mm;10mm<f2<15mm;40mm<f3<45mm;-15mm<f4<-10mm,16mm<dw12<17mm;0mm<dt12<1mm;4mm<dw23<5mm;3mm<dt23<4mm;6mm<dw34<7mm;4mm<dt34<5mm;1mm<dw45<2mm;17mm<dt45<18mm。

[0015] The lens body is composed of eight lenses and a turning prism;

[0016] The first lens group includes a first lens, a turning prism, a second lens, and a third lens arranged in sequence from front to back;

[0017] The second lens group includes a fourth lens;

[0018] The third lens group includes a fifth lens and a sixth lens;

[0019] The fourth lens group includes a seventh lens and an eighth lens;

[0020] The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the eighth lens are all aspherical lenses.

[0021] The lens body further includes an aperture, which is provided on the second lens group and fixed relative to the second lens group so as to be driven by the second lens group to move in the front-rear direction.

[0022] Second aspect

[0023] The present invention provides a mobile phone comprising the above-mentioned large-target-area periscope continuous zoom optical lens.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The above technical solution effectively meets the installation and application requirements of the lens body in thin electronic devices with imaging functions, such as mobile phones, and solves the technical problem that traditional lenses are difficult to adapt to thin electronic devices. In this solution, the second lens group, the third lens group, and the fourth lens group can be respectively arranged to move in the front-back direction, that is, the relative movement between the variable magnification lens group and the compensation lens group makes the focal length of the lens body adjustable; the variable magnification lens group mainly performs the magnification function, and can achieve continuous zooming of the lens body from the wide-angle end to the telephoto end; the compensation lens group mainly performs the image plane compensation function, and can compensate the image plane during the continuous zooming of the lens body, thereby ensuring the imaging quality of the lens body during continuous zooming, and facilitating the application of the large-target-area periscope continuous zoom optical lens in electronic devices with imaging functions, such as mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of an embodiment of the optical lens (first state) provided by the present invention;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure of the middle optical lens (second state);

[0028] Figure 3 for Figure 1 MTF curve at wide angle end of the medium lens body;

[0029] Figure 4 for Figure 1 Telephoto end MTF curve of the medium lens body;

[0030] In the figure, there are a first lens group 100 , a second lens group 200 , a third lens group 300 , a fourth lens group 400 , and an aperture 500 . DETAILED DESCRIPTION

[0031] The following is a clear and complete description of the technical solutions in the embodiments of the present invention, in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0032] It should be noted that Figure 1 The first state refers to the state with the shortest focal length. Figure 2 The second state refers to the state with the longest focal length.

[0033] Specifically, if Figures 1-4 As shown, the present invention provides a large-area periscope continuous zoom optical lens, comprising a lens body, with the direction from the object side to the image side along the optical axis of the lens body being from front to back. The lens body comprises a lens barrel, and a fixed lens group, a variator lens group, and a compensator lens group disposed within the lens barrel. The fixed lens group comprises a turning prism and a first lens group 100 having negative optical power, the variator lens group comprises a second lens group 200 having positive optical power, and the compensator lens group comprises a third lens group 300 and a fourth lens group 400. The first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 are arranged in sequence from front to back, and the second lens group 200, the third lens group 300, and the fourth lens group 400 are each movable relative to the lens barrel in the front-to-back direction.

[0034] In this solution, the second lens group 200, the third lens group 300, and the fourth lens group 400 can be respectively moved in the front-rear direction, that is, the magnification lens group and the compensation lens group can move relative to each other, so that the focal length of the lens body can be adjusted; the magnification lens group mainly undertakes the magnification change function, and can realize continuous zooming of the lens body from the wide-angle end to the telephoto end; the compensation lens group mainly undertakes the image plane compensation function, and can compensate the image plane during the continuous zooming of the lens body.

[0035] Preferably, in an embodiment, the first lens group is a fixed group, and the first lens group 100 has negative optical power; the second lens group 200 has positive optical power; the third lens group 300 has positive optical power; and the fourth lens group 400 has negative optical power.

[0036] The focal length of the first lens group 100 is f1, the focal length of the second lens group 200 is f2, the focal length of the third lens group 300 is f3, the focal length of the fourth lens group 400 is f4, and the distance between the first lens group 100 and the second lens group 200 at the wide-angle end is d w12The distance between the first lens group 100 and the second lens group 200 at the telephoto end is d t12 The distance between the second lens group 200 and the third lens group 300 at the wide-angle end is d w23 The distance between the second lens group 200 and the third lens group 300 at the telephoto end is d t23 The distance between the third lens group 300 and the fourth lens group 400 at the wide-angle end is d w34 The distance between the third lens group 300 and the fourth lens group 400 at the telephoto end is d t34 The distance between the third lens group and the fourth lens group at the telephoto end is d t34 The distance between the fourth lens group and the image side at the wide-angle end is d w45 The distance between the fourth lens group and the image side at the telephoto end is d t45 , satisfying the following relationship: -30mm <f1<-25mm;10mm<f2<15mm;40mm<f3<45mm;-15mm<f4<-10mm,16mm<d w12 <17mm; 0mm <d t12 <1mm; 4mm <d w23 <5mm; 3mm <d t23 <4mm; 6mm <d w34 <7mm; 4mm <d t34 <5mm; 1mm <d w45 <2mm; 17mm <d t45 <18mm;

[0037] Based on the above data, each lens group in the second lens group 200, the third lens group 300, and the fourth lens group 400 has a movable range of approaching and moving away from the adjacent lens groups when moving forward and backward. By adjusting the relative position between the second lens group 200 and the first lens group 100 in the zoom lens group, the focal length of the lens body can be changed accordingly, and the lens body can be adjusted to the required magnification; by adjusting the relative position of the third lens group 300 and the fourth lens group 400 in the lens barrel, the imaging picture of the lens body can be adjusted to the required imaging quality. In this solution, the relative movement between the zoom lens group and the compensation lens group allows the focal length of the lens body to be adjusted between 13.2mm-40.7mm, and ensures that the image within this focal length range is clear. Figures 3 and 4 , which are MTF curves at the wide-angle end and the telephoto end of the lens body in the embodiment.

[0038] In an embodiment, when the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 move away from each other in the front-to-back direction, the thickness of the lens body is 12.0 mm. It is understood that the lens barrel of the lens body is configured as a telescopic structure, which can be driven to telescope and deform when the first lens group 100, the second lens group 200, and the third lens group 300 move in the front-to-back direction; alternatively, the lens barrel can be configured to be movable back and forth relative to, for example, a mobile phone body, so that when the first lens group 100, the second lens group 200, and the third lens group 300 move in the front-to-back direction, it can be driven to move back and forth in the direction to be at least partially contained within the mobile phone body and at least partially protrude from the outer wall of the mobile phone body. Such an arrangement ensures that when the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group are away from each other, the length of the lens body is 59.00 mm; and when the second lens group 200, the third lens group 300, and the fourth lens group 400 move toward each other in the front-to-back direction, the optical length of the lens body is 40.00 mm-57.00 mm, and the mechanical thickness is less than 12.5 mm, meeting the thickness requirements of smartphones for periscope lenses.

[0039] Preferably, the lens body further includes an aperture, which is disposed within the second lens group 200 and fixed relative to the second lens group 200 so as to be driven by the second lens group 200 to move in the fore-aft direction. The aperture is an aperture that limits the imaging beam; the position and size of the aperture directly affect the brightness, clarity, and partial aberrations of the image produced by the lens body. Positioning the aperture within the second lens group 200 and synchronously moving in the fore-aft direction with the second lens group 200 can achieve optimal brightness and clarity during zooming of the lens body.

[0040] Specifically, the aperture is provided on the front side of the second lens group 200. It should be noted that the aperture can be an independent hole or a surface of a lens. In this embodiment, the aperture is a hole on the front side of the second lens group 200.

[0041] In an optical system, the size of the aperture is closely related to spherical aberration, image clarity, depth of field, and image brightness. According to optical principles, a smaller aperture reduces spherical aberration, resulting in a clearer image and a greater depth of field, but also reduces image brightness. Conversely, a larger aperture enhances image brightness, but increases spherical aberration, reduces relative image clarity, and decreases depth of field. Therefore, to balance various optical properties, the aperture size must be limited to an appropriate range. In this embodiment, the aperture can be designed to be fixed or adjustable within a specific size range.

[0042] Preferably, the lens body is composed of eight lenses and a bending prism; the first lens group includes, from front to back, a first lens, a bending prism, a second lens, and a third lens; the second lens group includes a fourth lens; the third lens group includes a fifth lens and a sixth lens; and the fourth lens group includes a seventh lens and an eighth lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the eighth lens are all aspherical lenses. In this embodiment, the aperture stop is located on the front side of the fifth lens.

[0043] Specifically, please refer to Tables 1 to 4 below, which provide specific data for implementing the optical lens described in this embodiment.

[0044] The focal length of the first lens group is f1, which is -27.13 mm; the focal length of the second lens group is f2, which is 13.51 mm; the focal length of the third lens group is f3, which is 42.92 mm; and the focal length of the fourth lens group is f4, which is -11.93 mm.

[0045] In Table 1, S1 to S22 represent the surface numbers of each optical element, R represents the radius of curvature of the optical element, D represents the thickness of the optical element or the air gap, Nd represents the d-light refractive index of the optical material used, and Vd represents the d-light Abbe number of the optical material used. The first to eighth lenses all have a light entrance surface and a light exit surface along the light transmission direction. Specifically, the first lens light incident surface S1, the first lens light exit surface S2, the turning prism light incident surface S3, the turning prism light exit surface S7, the second lens light incident surface S8, the second lens light exit surface S9, the third lens light incident surface S10, the third lens light exit surface S11, the aperture surface S12, the fourth lens light incident surface S13, the fourth lens light exit surface S14, the fifth lens light incident surface S15, the fifth lens light incident surface S16, the sixth lens light incident surface S17, the sixth lens light exit surface S18, the seventh lens light incident surface S19, the seventh lens light exit surface S20, the eighth lens light incident surface S21, the eighth lens light exit surface S22, and the image side S23.

[0046] In Table 2, f' represents the focal length of the system, F-number represents the system F number, and ω represents the half field angle of the system. In Table 3, D1 represents the variable distance between the first lens group 100 and the second lens group 200, D2 represents the variable distance between the second lens group 200 and the third lens group 300, D3 represents the variable distance between the third lens group 300 and the fourth lens group 400, and D4 represents the variable distance between the fourth lens group 400 and the image side. Table 4 lists the aspheric coefficients of all surfaces of the aspheric lens, where K is the quadratic surface coefficient of the aspheric surface, and A4 to A8 are the even-order aspheric coefficients.

[0047] Table 1 Lens parameters

[0048]

[0049]

[0050] Table 2 Focal length, F number and half field of view parameters at wide-angle and telephoto ends

[0051] System focal length f' F-numberF-number Half field of view angle ω Wide-angle end 13.2 2.8 17 Telephoto end 40.7 4 5.6

[0052] Table 3 Distance between lens groups at wide-angle and telephoto ends

[0053] D1 D2 D3 D4 Wide-angle end 14.1 4.2 6.1 1.1 Telephoto end 0.1 3.2 5.0 17.2

[0054] Table 4 Aspheric coefficients of all surfaces of aspheric lenses

[0055]

[0056]

[0057] In other embodiments, the present invention further provides a mobile phone comprising the above-mentioned large-target-area periscope continuous zoom optical lens.

[0058] Finally, it should be noted that the above embodiments are merely examples and illustrations of the present invention and are not intended to limit the present invention to the described embodiments. Furthermore, those skilled in the art will appreciate that the present invention is not limited to the above embodiments and that various variations and modifications may be made based on the teachings of the present invention, all of which fall within the scope of the present invention.

Claims

1. A large-area periscope continuous zoom optical lens, characterized in that: The lens comprises a lens body, wherein the direction from the object side to the image side along the optical axis of the lens body is from front to back; The lens body includes a lens barrel and a fixed lens group, a variable magnification lens group and a compensation lens group arranged in the lens barrel; The fixed lens group includes a turning prism and a first lens group (100) with negative optical power; the variable power lens group includes a second lens group (200) with positive optical power; and the compensating lens group includes a third lens group (300) and a fourth lens group (400); The first lens group (100), the second lens group (200), the third lens group (300) and the fourth lens group (400) are arranged in sequence from front to back, and the second lens group (200), the third lens group (300) and the fourth lens group (400) are movably arranged in the front-to-back direction relative to the lens barrel.

2. The large-area periscope continuous zoom optical lens according to claim 1, characterized in that: The first lens group (100) is a fixed group, and the first lens group (100) has negative optical power; The second lens group (200) has positive optical power; The third lens group (300) has positive optical power; The fourth lens group (400) has negative optical power; The focal length of the first lens group (100) is f1, the focal length of the second lens group (200) is f2, the focal length of the third lens group (300) is f3, and the focal length of the fourth lens group (400) is f4. The distance between the first lens group (100) and the second lens group (200) at the wide-angle end is dw12, the distance between the first lens group (100) and the second lens group (200) at the telephoto end is dt12, the distance between the second lens group (200) and the third lens group (300) at the wide-angle end is dw23, and the distance between the second lens group (200) and the third lens group (300) at the telephoto end is dt 23, the distance between the third lens group (300) and the fourth lens group (400) at the wide-angle end is dw34, the distance between the third lens group (300) and the fourth lens group (400) at the telephoto end is dt34, the distance between the third lens group (300) and the fourth lens group (400) at the wide-angle end is dw34, the distance between the third lens group (300) and the fourth lens group (400) at the telephoto end is dt34, the distance between the fourth lens group (400) and the image side at the wide-angle end is dw45, and the distance between the fourth lens group (400) and the image side at the telephoto end is dt45, satisfying the following relationship: -30mm <f1<-25mm;10mm<f2<15mm;40mm<f3<45mm;-15mm<f4<-10mm,16mm<dw12<17mm;0mm<dt12<1mm;4mm<dw23<5mm;3mm<dt23<4mm;6mm<dw34<7mm;4mm<dt34<5mm;1mm<dw45<2mm;17mm<dt45<18mm。 3. The large-area periscope continuous zoom optical lens according to claim 2, characterized in that: The lens body is composed of eight lenses and a turning prism; The first lens group (100) comprises a first lens, a turning prism, a second lens and a third lens arranged in sequence from front to back; The second lens group (200) includes a fourth lens; The third lens group (300) includes a fifth lens and a sixth lens; The fourth lens group (400) includes a seventh lens and an eighth lens; The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the eighth lens are all aspherical lenses.

4. The large-area periscope continuous zoom optical lens according to claim 1, characterized in that: The lens body further comprises an aperture (500), which is arranged on the second lens group (200) and is fixed relative to the second lens group (200) so as to be driven by the second lens group (200) to move in a front-rear direction.

5. A mobile phone, characterized in that: It comprises a large-target-area periscope continuous zoom optical lens as claimed in any one of claims 1 to 4.

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