Lens system for compact digital camera

Abstract

A lens system for a compact digital camera comprising an image sensor having a sensor diagonal SD and a lens having a field of view FOV > 60 degrees. The lens has N lens elements L1-LN, N ≥ 6, arranged along a lens optical axis OA, the lens optical axis OA starting at L1 towards the imaging side on the object side, the lens elements being divided into two lens groups G1 and G2 separated by a large gap BG. The lens has a total track length TTL < 20 mm in an ejected state and a total track length c-TTL in a folded state. The lens system is configured to switch from the ejected state to the folded state and vice versa by folding the BG to a folded BG, wherein BG > 0.25 x TTL, SD ≥ 10 mm, c-TTL / SD < 0.7.

Description

[0001] This application is a divisional application of application number CN 202280003698.5 (PCT application number PCT / IB2022 / 050594), filed on January 24, 2022, entitled "Thin Pop-up Wide Camera Lens".

[0002] Cross-references to related applications

[0003] This application claims priority to U.S. Provisional Patent Application 63 / 141,128, filed January 25, 2021, the entire disclosure of which is incorporated herein by reference. Technical Field

[0004] This disclosure generally relates to digital cameras, and in particular to digital cameras with pop-out mechanisms and lenses.

[0005] definition

[0006] In this application, the following symbols and abbreviations are used for optical and other characteristics mentioned in the specification and drawings, all of which are terms known in the art:

[0007] Total track length (TTL): The maximum distance between a point on the front surface S1 of the first lens element L1 and the image sensor, measured along an axis parallel to the lens optical axis, when the system is focused on a target at infinity.

[0008] Back focal length (BFL): The minimum distance between the image sensor and a point on the rear surface S2N of the last lens element LN, measured along an axis parallel to the lens optical axis, when the system is focused on a target at infinity.

[0009] Effective focal length (EFL): In a lens (an assembly of lens elements L1 to LN), the distance between the rear principal point P' and the rear focal point F'.

[0010] f-number (f / #): The ratio of the EFL to the diameter of the entrance pupil. Background Technology

[0011] Multi-aperture digital cameras (or multi-camera systems) are standard on today's mobile handheld electronic devices (referred to as "mobile devices," such as smartphones and tablets). Typically, they feature a wide field of view (FOV) of 70-90 degrees. WThe wide camera is used as the main (or "first") camera of the mobile device.

[0012] A major challenge is designing a wide camera to support higher image quality (IQ) while still fitting it into thin mobile devices with a height of less than 10mm. One promising way to improve the image quality of a wide camera is to incorporate a larger image sensor.

[0013] Figure 1A The definitions of various camera entities such as TTL, EFL, and BFL are illustrated schematically. In most microlenses used in multi-camera systems in mobile devices, TTL is greater than EFL, such as... Figure 1A As shown, for example, for a wide lens.

[0014] Figure 1B An exemplary camera with a lens having a field of view (FOV), an edge width (EFL), and an image sensor having a sensor width S is shown. For a fixed width / height ratio and a (rectangular) image sensor, the sensor diagonal (SD) is proportional to the sensor width and height. For example, the SD for a 1 / 1.2" sensor is 14.3 mm. The horizontal FOV is related to the EFL and the sensor width S as follows:

[0015]

[0016] This indicates that a larger EFL is required to achieve a camera with a larger image sensor but a similar FOV. Incorporating a larger image sensor into a wide-angle camera is desirable for improving its IQ, but it requires a larger EFL to maintain the same (wide-angle) FOV, resulting in a larger TTL, which is undesirable as it hinders the integration of wide-angle cameras into mobile devices.

[0017] Pop-up cameras resolve this conflict. They combine the advantages of a large TTL when the camera is in use (“pop-up state”) and an ultra-thin design that folds the TTL into a folded TTL (“c-TTL”) when the camera is not in use (“folded state”). c-TTL is compatible with the height and size of modern mobile devices. A pop-up camera can only function as a camera in the pop-up state. Such pop-up cameras are described, for example, in co-owned international patent application PCT / IB2020 / 058697.

[0018] A wide camera lens design that supports a pop-up wide camera, including a large image sensor, such as 1 / 1.2", or larger, i.e., SD ≥ 14.3 mm, would be beneficial. Summary of the Invention

[0019] In various examples, a lens system for a compact digital camera is disclosed, comprising an image sensor having a sensor diagonal SD and a lens. The lens has a field of view (FOV) > 60 degrees and N lens elements L1-LN (N ≥ 6) extending from a target side towards an imaging side, starting from L1. Each lens element Li has a focal length fi of size |fi|. The lens elements are divided into two lens groups G1 and G2 separated by a large gap (BG). The lens has a total pop-up trajectory length (TTL) < 20 mm in a pop-up state and a total folding trajectory length (c-TTL) in a folded state. The lens system is configured to switch from a pop-up state to a folded state (and vice versa) by folding BG to a folded BG, where BG > 0.25 x TTL, SD ≥ 12 mm, and a ratio c-TTL / SD < 0.7.

[0020] In some embodiments, G1 includes five or more lens elements, while G2 includes one or two lens elements.

[0021] In some embodiments, the ratio c-TTL / TTL < 0.7. In some embodiments, the ratio c-TTL / TTL < 0.65.

[0022] In some embodiments, BG > 0.3x TTL. In some embodiments, BG > 0.35x TTL.

[0023] In some embodiments, a thickness T of G1 G1 Satisfying 0.35xTTL <T G1 <0.47xTTL.

[0024] In some embodiments, the power P of G1 G1 Satisfy P G1 >0 and the 1 joule P of G2 G2 Satisfy P G2 <0. In some embodiments, -1.81≤P G1 / P G2 ≤-0.9.

[0025] In some embodiments, i = 6, and a sequence of lens power from lens elements L1 to L6 can be positive-negative-positive-negative-positive-negative.

[0026] In some embodiments, i = 7, and a sequence of lens power from lens element L1 to L7 can be positive-negative-negative-positive-negative, or positive-negative-positive-negative-negative-positive-negative, or positive-positive-negative-positive-negative-positive-negative, or positive-negative-positive-negative-positive-negative, or positive-negative-positive-positive-negative-positive-negative.

[0027] In some embodiments, i=8, and the sequence of lens powers from lens element L1 to L8 may be positive-positive-negative-positive-negative-positive-positive-negative, or positive-negative-negative-positive-negative-positive-positive-negative.

[0028] In some embodiments, the last two lens elements in G1 together have an Abbe number V and an effective focal length EFL, where 50<V<120, and 13 mm<EFL<50 mm.

[0029] In some embodiments, the variation amplitude of the focal length magnitude |f1| of L1 and the focal length magnitude |f6| of L6 may be less than 25%, wherein both |f1| and |f6| are less than 45% of the respective focal length magnitudes |f2|, |f3|, |f4| and |f5| of L2, L3, L4 and L5.

[0030] In some embodiments, L1, L2, L3 and L4 have a meniscus shape relative to the object side, and L5 and L6 have a meniscus shape relative to the image side.

[0031] In some embodiments, the variation amplitude of the focal length magnitude |f4| of L4 may be greater than 50% of the respective focal length magnitudes |f1|, |f2|, |f3|, |f5|, |f6| of L1, L2, L3, L5 and L6.

[0032] In some embodiments, the variation amplitude of the focal length magnitude |f6| of L6 may be greater than 100% of each of the focal length magnitudes |f1|, |f2|, |f3|, |f4|, |f5|.

[0033] In some embodiments, P G1 The variation amplitude of / P3 is no more than 10% of 1. In some embodiments, P G1 The variation amplitude of / P6 is no more than 10% of 1. In some embodiments, P G1 / P3 and P G1 The variation amplitude of / P6 is no more than 20% of 1. In some embodiments, P G1 / P6 and P G1 The variation amplitude of / P7 is no more than 20% of 1. In some embodiments, P G1 The variation amplitude of / P1 is no more than 20% of 1. In some embodiments, P G1 / P1, P G1 / P5 and P G1 The variation amplitude of / P7 is no more than 20% of 1. In some embodiments, P G1 / P6 and P G1 The variation amplitude of / P8 is no more than 20% of 1. In some embodiments, P G1 / P3, P G1 / P6 and P G1 The variation amplitude of / P8 is not more than 10% of 1.

[0034] In some embodiments, one or more lens elements are made of glass, wherein the refractive index n of each of the one or more lens elements may be greater than 1.7.

[0035] In some embodiments, L4 is made of glass, and the refractive index n>1.7.

[0036] In some embodiments, L2, L4, and L6 are made of glass, and the respective refractive index n>1.7.

[0037] In some embodiments, L4 and L6 are made of glass, and the respective refractive index n>1.7.

[0038] In some embodiments, a deflection point on the front surface of L1 is located at a d-f position measured from an optical axis of the lens, where 1.5 mm < d-f < 3.5 mm.

[0039] In some embodiments, a deflection point on the rear surface of L1 is located at a d-r position measured from an optical axis of the lens, where 1.5 mm < d-r < 3.5 mm.

[0040] In some embodiments, the above-mentioned or below-mentioned lens system is included in a pop-up camera having a sensor, and the sensor has a sensor diagonal SD in the range of 10-30 mm.

[0041] In some embodiments, the above-mentioned or below-mentioned lens system is included in a pop-up camera having a sensor, and the sensor has a sensor diagonal SD in the range of 14-22 mm.

[0042] In some embodiments, the above-mentioned or below-mentioned lens system is included in a pop-up camera, wherein the pop-up camera is included in a smartphone.

[0043] In various examples, a lens system for a compact digital camera is disclosed, which includes an image sensor having a sensor diagonal SD and a lens, the lens having a field of view FOV>60 degrees and having an f-number (f / #), a lens thickness ("T LensThe lens system comprises a back focal length (BFL), an effective focal length (EFL), and N lens elements L1-LN (N≥6) extending from a target side toward an imaging side, starting from L1. Each lens element Li has its own focal length fi, the size of which is |fi|. The lens system is configured to switch from a pop-up state to a folded state (and vice versa) by folding the BFL to a folded BFL, wherein SD≥12 mm, BFL>0.15x TTL, and a ratio c-TTL / SD<0.65. Attached Figure Description

[0044] The following description, with reference to the accompanying drawings listed later in this paragraph, illustrates non-limiting examples of the examples disclosed herein. Identical structures, elements, or parts appearing in multiple drawings are generally labeled with the same numbering in all the drawings in which they appear. If the same element is shown but numbered only in one drawing, it is assumed that it has the same numbering in all the drawings in which it appears. The drawings and descriptions are intended to illustrate and clarify the examples disclosed herein and should not be construed as limiting in any way. In the drawings:

[0045] Figure 1A The definitions of various entities, such as TTL and EFL, are illustrated schematically;

[0046] Figure 1B It shows the definitions of FOV, EFL, and S for thin lenses, which are approximately or equivalent.

[0047] Figure 2A The pop-up optical lens system disclosed herein, which is in a pop-up state when focused to infinity, is illustrated schematically.

[0048] Figure 2B The illustration shows the folded state. Figure 2A Pop-up system;

[0049] Figure 2C Another pop-up optical lens system disclosed herein is shown schematically in a pop-up state;

[0050] Figure 2D The illustration shows the folded state. Figure 2C Pop-up system;

[0051] Figure 3A This demonstrates focusing to a closer (e.g., 50 cm) distance according to the first method. Figure 2A Pop-up system;

[0052] Figure 3B This demonstrates focusing to a closer (e.g., 50 cm) distance according to the second method. Figure 2A Pop-up system;

[0053] Figure 4 An example of the pop-up optical lens system disclosed herein is shown;

[0054] Figure 5 Another example of the pop-up optical lens system disclosed herein is shown;

[0055] Figure 6 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0056] Figure 7 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0057] Figure 8 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0058] Figure 9 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0059] Figure 10 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0060] Figure 11 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0061] Figure 12 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0062] Figure 13 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0063] Figure 14 This illustrates yet another example of the pop-up optical lens system disclosed herein;

[0064] Figure 15 , 16 Figures 17 and 18 show yet another example of the pop-up optical lens system disclosed herein. Detailed Implementation

[0065] Figure 2A An example of a "2-group" (or "2G") pop-up optical lens system 200, including a pop-up lens 202 and an image sensor 204 disclosed herein, is shown. The pop-up optical lens system 200 is shown in a pop-up or extended state (i.e., focused to infinity). The pop-up lens 202 is divided into two lens groups separated by a big gap (BG), the first being a target-side lens group ("G1") and the second being a sensor-side lens group ("G2"). The thickness of G1 is determined by T. G1The lens 202 comprises a plurality of N lens elements Li (where "i" is an integer between 1 and N, and N may be, for example, an integer between 5 and 9). L1 is the lens element closest to the target side, and LN is the lens element closest to the imaging side, i.e., the side where the image sensor is located. This order applies to all lenses and lens elements disclosed herein. Each lens element Li includes a respective front surface S2i-1 (the indicator "2i-1" indicates the number of the front surface) and a respective rear surface S2i (the indicator "2i" indicates the number of the rear surface). This numbering convention is used throughout the specification. Alternatively, as described in this specification, the lens surfaces are marked "Sk", where k ranges from 1 to 2N. The front and rear surfaces may be aspherical in some cases. However, this is not a limitation.

[0066] As used herein, the term "front surface" for each lens element refers to the surface of the lens element located closer to the camera inlet (camera target side), and the term "rear surface" refers to the surface of the lens element located closer to the image sensor (camera imaging side).

[0067] Each lens group includes one or more lens elements Li. G1 may include ≥5 elements, and G2 may include 1-2 elements. G2 can be used as a field lens as known in the art.

[0068] Figure 2B A 2G pop-up optical lens system 200 in a folded state is shown. The large gap BG is folded into a folded BG (labeled "c-BG"), i.e., the distance between G1 and G2 is reduced, resulting in a folded TTL ("c-TTL"). c-BG can range from 0.2mm to 5mm. Only BG changes. Other distances in the pop-up optical lens system 200, such as the distances between the individual lens elements included in G1 and G2 respectively, remain unchanged.

[0069] Figure 2C An example of a "1-group" (or "1G") pop-up optical lens system 250 is shown, which includes a system having a thickness T Lens The pop-up lens 252 and the image sensor 254 disclosed herein. The pop-up optical lens system 250 is shown in the pop-up state. The pop-up lens 252 is not divided into two lens groups. Figure 2D A 1G pop-up optical lens system 250 in a folded state is shown. The BFL is folded into a folded BFL (labeled "c-BFL"), meaning the distance between the lens 252 and the image sensor 254 is reduced, resulting in c-TTL. The c-BFL can be in the range of 0-3mm. Only the BFL changes. Other distances in the pop-up optical lens system 250, such as the distance between the lens elements of the lens 252, remain unchanged.

[0070] 2G pop-up optical lens system 200 and 1G pop-up optical lens system 250 can be included in a pop-up camera. To perform optical image stabilization (OIS), the pop-up camera can use several methods known in the art. Such methods can be "lens-shift OIS," in which the lens moves relative to the image sensor and the camera carrying the OIS mobile device, or "sensor-shift OIS," in which the image sensor moves relative to the lens and the camera carrying the OIS mobile device.

[0071] All the pop-up optical lens systems disclosed herein can be used in examples of the pop-up camera described in the jointly owned PCT patent application PCT / IB2020 / 058697.

[0072] in, Figure 2A A 2G pop-up optical lens system 200 focusing to infinity is shown. Figure 3A A 2G pop-up optical lens system 200 is shown that focuses on a closer object, for example, focusing to 1m according to a first focusing method known as "G1-G2 focusing". For G1-G2 focusing, G1 and G2 are separated by a focusing stroke Δf. G1-G2 =T Focus -BG, move from the thickness given by BG to T Focus Relative to each other's given thickness, BFL remains unchanged, but BG changes. Table 1 shows the BG and T for all 2G lens systems disclosed in this paper. Focus The value of #BG indicates the surface that changes when G1-G2 is focused.

[0073] Figure 3B The 2G pop-up optical lens system 200 is shown focusing on a closer object, for example, focusing to 1m according to a second focusing method known as "lens focusing". For lens focusing, G1 and G2 move together as a lens relative to the image sensor by Δf. Lens BG remains the same, but BFL changes. Lens focusing is the standard method used in the most advanced digital cameras in mobile electronic devices.

[0074] All 2G pop-up optical lens systems disclosed below can be focused using both G1-G2 focusing and lens focusing. All 1G pop-up optical lens systems disclosed below are focused using lens focusing.

[0075] All pop-up optical lens systems shown below are displayed in the pop-up state, including pop-up cameras of operational optical lens systems.

[0076] In the folded state, examples of all 2G pop-up optical lens systems have a c-BG of 0.2mm-4.4mm. In the folded state, examples of all 1G pop-up optical lens systems have a c-BFL of 1.0mm-2.5mm. The small c-BG and c-BFL are advantageous for realizing ultra-thin camera modules that can be integrated into ultra-thin mobile devices such as smartphones. For clarity, all lens systems disclosed herein can be advantageously included in or incorporated into smartphones.

[0077] Table 1 shows the values ​​and ranges included in the following disclosed lens system examples 400-1800 (SD, TTL, c-TTL, BG, c-BG, EFL, TG1, T...). Focus d L1-L2 T Lens f LS f N-1 Units are millimeters (mm); half field of view (“HFOV”) and 35mm equivalent focal length (“35mm EqFL”), in degrees, Abbe number v, #L S The f-number ("f / #") is unitless, and the unit of power is inverted meter [1 / m]. c-TTL MIN and c-TTL MAX These refer to the minimum and maximum c-TTL that can be achieved in their respective examples. Typically, in Table 1, "MIN" and "MAX" refer to the minimum and maximum values ​​within the range, respectively.

[0078] #L S "" indicates the number of the strongest lens element in the lens, that is, the lens element with the smallest positive focal length f. LS "f" represents the strongest lens element in the lens. N-1 "" represents the f of the (N-1)th (i.e., the second to last) lens element in the lens. L1-L2 This represents the distance (or air gap) between L1 and L2.

[0079] For the 2G lens system, L M Refers to the last lens element in G1. The indicator "L" M-1 +L M "" refers to the characteristic of the last two lens elements together in G1. For example, in Example 400, L M-1 +L M Together, they represent the characteristics of L5 and L6. In Example 1500, L... M-1 +L M Together, they represent the characteristics of L6 and L7, etc. For G1-G2 focusing, BG represents the thickness of the surface "#BG" when focused to infinity. "T Focus"#BG" indicates the corresponding thickness of the surface when focused at 1m and 0.5m. The focal length of the entire G1 group is marked as P. G1 The focal length of the entire G2 group is marked as P. G2 The focal length of each lens element is marked by its element number; that is, the focal length of L1 is marked as P1, the focal length of L2 is marked as P2, and so on. G1 Give the thickness of G1.

[0080] type 2G 2G 2G 2G 2G 2G 2G 2G 2G 2G 2G 2G SD 14.3 14.3 21.5 21.5 21.5 21.5 21.5 21.5 21.5 21.5 21.5 21.5 14.30 21.50 TTL 10.83 11.07 16.79 16.82 14.99 13.80 15.90 14.01 14.00 16.39 14.66 16.72 10.83 16.82 <![CDATA[c-TTL MIN ]]> 6.49 6.50 9.01 9.00 9.01 9.00 9.00 9.00 9.00 8.80 8.80 8.81 6.49 9.01 <![CDATA[c-TTL MAX ]]> 10.50 10.50 12.00 12.00 12.00 12.00 12.00 12.00 12.00 12.00 12.00 12.00 10.50 12.00 BG 4.54 4.78 7.98 8.01 6.18 5.00 7.10 5.20 5.20 7.79 6.07 8.12 4.54 8.12 #BG 13 13 13 13 13 11 13 13 13 13 13 15 11 15 <![CDATA[T Focus (1m)]]> 4.6073 4.848 8.309 7.237 5.321 5.313 8.071 4.607 8.309 <![CDATA[T Focus (0.5m)]]> 8.332 6.435 5.375 6.318 8.396 5.375 8.396 <![CDATA[c-BG MIN ]]> 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 0.20 <![CDATA[c-BG MAX ]]> 4.21 4.20 3.19 3.20 3.19 3.20 3.20 3.20 3.20 3.40 3.40 3.39 3.19 4.21 EFL 9.09 9.15 13.36 13.41 12.12 12.23 13.14 12.11 12.10 12.58 12.70 13.19 9.09 13.41 <![CDATA[T G1 ]]> 4.55 4.71 5.94 6.34 6.27 6.35 6.32 6.40 6.18 6.17 5.73 5.84 4.55 6.40 <![CDATA[P G1 ]]> 0.12 0.12 0.08 0.08 0.09 0.09 0.08 0.09 0.10 0.08 0.09 0.08 0.08 0.12 <![CDATA[P G2 ]]> -0.10 -0.07 -0.04 -0.05 -0.08 -0.07 -0.07 -0.10 -0.11 -0.07 -0.08 -0.08 -0.11 -0.04 <![CDATA[v LM-1+LM ]]> 75.80 76.39 71.87 79.38 80.34 75.35 75.80 75.80 93.91 56.87 109.10 76.28 56.87 109.10 <![CDATA[EFL LM-1+LM ]]> 13.93 35.70 17.51 49.75 33.06 45.84 20.27 26.20 15.81 12.50 16.65 27.55 12.50 49.75 f / # 2.00 2.00 2.00 2.00 2.00 2.50 2.00 2.00 2.00 2.00 2.00 2.00 2.00 2.50 HFOV 38.00 38.00 38.70 38.60 41.30 41.10 39.10 41.20 41.20 39.30 39.80 39.40 38.00 41.30 35mm EqFL 27.59 27.77 26.97 27.06 24.47 24.69 26.53 24.44 24.43 25.40 25.64 26.62 24.43 27.77 BG / TTL 0.42 0.43 0.48 0.48 0.41 0.36 0.45 0.37 0.37 0.48 0.41 0.49 0.36 0.49 <![CDATA[c-TTL MIN / TTL]]> 0.60 0.59 0.54 0.54 0.60 0.65 0.57 0.64 0.64 0.54 0.60 0.53 0.53 0.65 <![CDATA[c-TTL MAX / TTL]]> 0.97 0.95 0.71 0.71 0.80 0.87 0.75 0.86 0.86 0.73 0.82 0.72 0.71 0.97 <![CDATA[T G1 / TTL]]> 0.42 0.43 0.35 0.38 0.42 0.46 0.40 0.46 0.44 0.38 0.39 0.35 0.35 0.46 TTL / EFL 1.19 1.21 1.26 1.25 1.24 1.13 1.21 1.16 1.16 1.30 1.15 1.27 1.13 1.30 TTL / SD 0.76 0.77 0.78 0.78 0.70 0.64 0.74 0.65 0.65 0.76 0.68 0.78 0.64 0.78 c-TTL / SD 0.45 0.45 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.41 0.41 0.41 0.41 0.45 <![CDATA[P G1 / P G2 ]]> -1.20 -1.71 -2.00 -1.60 -1.13 -1.29 -1.14 -0.90 -0.91 -1.14 -1.13 -1.00 -2.00 -0.90 <![CDATA[c-TTL MIN / SD]]> 0.45 0.45 0.42 0.42 0.42 0.42 0.42 0.42 0.42 0.41 0.41 0.41 0.41 0.45 <![CDATA[c-TTL MAX / SD]]> 0.73 0.73 0.60 0.60 0.60 0.60 0.60 0.60 0.60 0.60 0.60 0.60 0.60 0.73

[0081] Table 1

[0082]

[0083]

[0084]

[0085] Table 1 (continued)

[0086] In all the 2G lens system examples 400-1500 disclosed below, the TTL to EFL ratio is in the range of TTL / EFL = 1.13-1.3, the TTL to SD ratio is in the range of TTL / SD = 0.64-0.78, and the c-TTL to SD ratio is in the range of c-TTL / SD = 0.41-0.73.

[0087] In all the 1G lens system examples 1600-1800 disclosed below, the TTL to EFL ratio is in the range of TTL / EFL = 1.05-1.3, the TTL to SD ratio is in the range of TTL / SD = 0.59-0.65, and the c-TTL to SD ratio is in the range of c-TTL / SD = 0.50-0.65.

[0088] Figure 4 An example of the 2G pop-up optical lens system, numbered 400, disclosed herein is shown. The lens system 400 includes a pop-up lens 402 divided into two lens groups G1 and G2, an image sensor 404, and optional optical elements 406. Optical elements 406 may be, for example, an infrared (IR) filter and / or a glass image sensor dust cover. The image sensor 404 has an SD of 14.3 mm. G1 includes six lens elements, and G2 includes one lens element. Light passes through the lens 402 and forms an image on the image sensor 404. Figure 4 Three fields are shown, each with three rays: the upper edge ray, the lower edge ray, and the principal ray. All further figures also show these three rays.

[0089] Detailed optical and surface data for the pop-up lens 402 are shown in Tables 2-3. Table 2 provides the surface types, and Table 3 provides the aspherical coefficients. Surface types include:

[0090] a) Plane: A flat surface with no curvature.

[0091] b) Q-type 1 (QT1) surface sag formula:

[0092]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098] c) Formula for the concavity of a uniform aspherical (ASP) surface:

[0099]

[0100] Where {z, r} are standard cylindrical polar coordinates, c is the paraxial curvature of the surface, k is the conic parameter, and r norm Typically, it is half the clear aperture (CA) of the surface, A n This refers to the aspherical coefficient shown in the lens datasheet. The Z-axis is positive when facing the imaging side. The CA value represents the aperture radius, i.e., D / 2. The reference wavelength is 555.0 nm. Except for the refractive index (“index”) and Abbe number, the units are in millimeters. Each lens element Li has its own focal length fi, as shown in Table 2. FOV is expressed as half FOV (HFOV). The definitions of surface type, Z-axis, CA value, reference wavelength, unit, focal length, and HFOV apply to the following table.

[0101]

[0102]

[0103] Table 2

[0104]

[0105] Table 3

[0106]

[0107] Table 3 (continued)

[0108] The deflection point of L1 is located at a distance of 1.884 mm from the optical axis (“OA”) measured from the rear surface. The focal length of L1 (|f1|) is similar to that of L6 (|f6|), meaning their variation is less than 30%. The focal lengths |f1| and |f6| are in contrast to the much smaller focal lengths of all single-lens elements L2, L3, L4, and L5, i.e., |f1|, |f6| << |f2|, |f3|, |f4|, |f5|. For example, |f2|, |f3|, |f4|, |f5| may be more than 45% larger than |f1|, |f6|. The power (P1) of L1 and P... G1 The ratio satisfies P1 / P G1 = 0.89. Specifically, Table 4 shows the ratios |fi / f1| and |fi / f6| and each P i and P G1 The ratio between them.

[0109]

[0110]

[0111] Table 4

[0112] Figure 5 Another example of the 2G pop-up optical lens system, numbered 500, disclosed herein is shown. Lens system 500 includes a pop-up lens 502 divided into two lens groups G1 and G2, an image sensor 504, and optional optical elements 506. The image sensor 504 has an SD of 14.3 mm (“1 / 1.2” sensor). Table 5 provides the surface types, and Table 6 provides the aspherical coefficients.

[0113]

[0114] Table 5

[0115]

[0116] Table 6

[0117]

[0118]

[0119] Table 6 (continued)

[0120] The focal length sequence of lens elements from L1 to L7 is as follows: +--+-+-(positive-negative-negative-positive-negative-positive-negative). Specifically, Table 7 gives the lens focal length P of lens elements from L1 to L7. i L1, L2, and L4 are each menisci formed relative to the target side. L5 and L6 are each menisci formed relative to the imaging side. |f4| is much smaller than all the focal lengths |f| of a single lens element L1, L2, and L3. That is, |f4| << |f1|, |f2|, |f3|. For example, |f1|, |f2|, and |f3| may be more than 50% larger than |f4|. L4 is made of glass with a refractive index n > 1.7. P G1 Similar to P3, i.e., P G1 The change in P3 is no greater than 10% of 1. Specifically, Table 7 shows the focal length P. i The ratio |f / f4|, and each P i and P G1 ratio

[0121] 1 0.06 3.56 0.47 2 -0.02 13.06 -0.13 3 -0.12 1.67 -1.00 4 0.20 1.00 1.67 5 -0.066 3.00 -0.56 6 0.08 2.36 0.71 7 -0.07 -0.63

[0122] Table 7

[0123] Figure 6 This document illustrates another example of the 2G pop-up optical lens system, designated 600, disclosed herein. The lens system 600 includes a pop-up lens 602, divided into G1 and G2, an image sensor 604, and optional optical elements 606. The image sensor 604 may have an SD of 21.5 mm (“1 / 0.8” sensor).

[0124] Table 8 provides the surface types, and Table 9 provides the aspherical coefficients.

[0125]

[0126] Table 8

[0127]

[0128]

[0129] Table 9

[0130]

[0131]

[0132] Table 9 (continued)

[0133] The power sequence of the lens elements from L1 to L7 is as follows: +-+--+-(positive-negative-positive-negative-negative-positive-negative). L5 and L6 (the last two lens elements of G1) together possess Abbe number.L5+L6 =71.87, EFL L5+L6 = 17.51mm. |f6| is much smaller than all the focal lengths of a single lens element L1, L2, L3, L4, L5, i.e., |f6| << |f1|, |f2|, |f3|, |f4|, |f5|. For example, |f1|, |f2|, |f3|, |f4|, |f5| can be greater than 100% of |f6|. L2, L4, and L6 are made of glass with a refractive index n > 1.7. P G1 Similar to P6, i.e., P G1 The variation of / P6 does not exceed 10% of 1. Specifically, Table 10 shows the focal length P. i The ratio |f / f6| and each P i and P G1 The ratio of .

[0134] 1 0.04 2.15 0.50 1.58 2 -0.01 13.09 -0.08 1.80 3 0.03 2.83 0.38 1.65 4 -0.03 3.04 -0.36 1.75 5 -0.03 2.56 -0.42 1.68 6 0.09 1.00 1.08 1.76 7 -0.04 -0.55 1.50

[0135] Table 10

[0136] Figure 7 Another example of the 2G pop-up optical lens system, designated 700, disclosed herein is shown. The lens system 700 includes a pop-up lens 702, divided into G1 and G2, an image sensor 704, and optional optical elements 706. The image sensor 204 has an SD of 21.5 mm (“1 / 0.8” sensor). Table 11 provides the surface types, and Table 12 provides the aspherical coefficients.

[0137]

[0138]

[0139] Table 11

[0140]

[0141]

[0142] Table 12

[0143]

[0144] Table 12 (continued)

[0145] The power sequence of the lens elements from L1 to L7 is as follows: ++-+-+-(positive-positive-negative-positive-negative-positive-negative), see Table 13. L5 and L6 (the last two lens elements of G1) together have Abbe # L5+L6 =79.38, EFL L5+L6= 49.75mm. |f4| is much smaller than all the focal lengths of the single lens elements L1, L2, L3, L5, and L6, that is, |f4| << |f1|, |f2|, |f3|, |f5|, and |f6|. For example, |f1|, |f2|, |f3|, |f5|, and |f6| can be greater than 80% of |f4|.

[0146] The deflection point of L1 is located at a distance of 3.275 mm from OA on the front surface and at a distance of 2.749 mm from OA on the rear surface. P G1 Similar to P3, and P G1 Similar to P6, i.e., P G1 / P3 and P G1 The variation of / P6 does not exceed 20% of 1. L4 is made of glass with a refractive index n > 1.7. Specifically, Table 13 also shows the focal length P. i Each P i and P G1 The ratios, |f / f4|, and the refractive index of each lens element.

[0147] 1 0.03 0.33 4.98 1.55 2 0.01 0.08 19.99 1.68 3 -0.09 -1.12 1.48 1.59 4 0.13 1.67 1.00 1.89 5 -0.06 -0.75 2.21 1.64 6 0.07 0.89 1.86 1.55 7 -0.05 -0.62 1.53

[0148] Table 13

[0149] Figure 8 Another example of the 2G pop-up optical lens system disclosed herein, designated 800, is shown. The lens system 800 includes a pop-up lens 802 divided into G1 and G2, an image sensor 804, and optional optical elements 806. The image sensor 804 has an SD of 21.5 mm. Table 14 provides only surface types, and Table 15 provides aspherical coefficients.

[0150]

[0151]

[0152] Table 14

[0153]

[0154] Table 15

[0155]

[0156] Table 15 (continued)

[0157] The lens power sequence from L1 to L7 is as follows: ++-+-+-(positive-positive-negative-positive-negative-positive-negative). The deflection point of L1 is located at a distance of 1.989 mm from OA on the front surface and 1.95 mm from OA on the rear surface. P G1 Similar to P6, and P G1 Similar to P7, i.e., P G1 / P6 and P G1 The variation of / P7 does not exceed 20% of 1. Specifically, Table 16 shows the focal length P. i And each P i and P G1 The ratio between them.

[0158]

[0159]

[0160] Table 16

[0161] Figure 9 Another example of the 2G pop-up optical lens system, designated 900, disclosed herein is shown. Lens system 900 includes a pop-up lens 902 divided into G1 and G2, an image sensor 904, and optional optical elements 906. The image sensor 904 has an SD of 21.5 mm. G1 includes five lens elements, and G2 includes one lens element. Table 17 provides surface types, and Table 18 provides aspherical coefficients.

[0162]

[0163] Table 17

[0164]

[0165] Table 18

[0166]

[0167] Table 18 (continued)

[0168] The lens power sequence from L1 to L6 is as follows: +-+-+-(positive-negative-positive-negative-positive-negative). P G1 Similar to P1, i.e., P G1 The change between / P1 and 1 does not exceed 20%. Specifically, Table 19 shows the focal length P. i And each P i and P G1 The ratio between them.

[0169] 1 0.10 1.09 2 -0.04 -0.40 3 0.02 0.20 4 -0.04 -0.48 5 0.06 0.67 6 -0.07 -0.78

[0170] Table 19

[0171] Figure 10 Another example of the 2G pop-up optical lens system, numbered 1000, disclosed herein is shown. The lens system 1000 includes a pop-up lens 1002, divided into G1 and G2, an image sensor 1004, and optional optical elements 1006. The SD of the image sensor 204 can be 21.5 mm. Table 20 provides surface types, and Table 21 provides aspherical coefficients.

[0172]

[0173]

[0174] Table 20

[0175]

[0176] Table 21

[0177]

[0178]

[0179] Table 21 (continued)

[0180] The lens power sequence from L1 to L7 is as follows: +--+-+-(positive-negative-negative-positive-negative-positive-negative). P G1 Similar to P6, i.e., P G1 The change between / P6 and 1 does not exceed 20%. L4 and L6 are made of glass with a refractive index n > 1.7. Specifically, Table 22 shows the focal length P. i Each P i and P G1 The ratio between them and the refractive index of the lens element.

[0181] 1 0.07 0.86 1.58 2 -0.02 -0.25 1.65 3 -0.01 -0.15 1.64 4 0.01 0.15 1.75 5 -0.05 -0.60 1.64 6 0.09 1.10 1.76 7 -0.07 -0.87 1.55

[0182] Table 22

[0183] Figure 11 Another example of the 2G pop-up optical lens system, numbered 1100, disclosed herein is shown. The lens system 1100 includes a pop-up lens 1102, divided into G1 and G2, an image sensor 1104, and optional optical elements 1106. The image sensor 1104 has an SD of 21.5 mm. Table 23 provides the surface types, and Table 24 provides the aspherical coefficients.

[0184]

[0185] Table 23

[0186]

[0187]

[0188] Table 24

[0189]

[0190] Table 24 (continued)

[0191] The lens power sequence from L1 to L7 is as follows: +-++-+-(positive-negative-positive-positive-negative-positive-negative). P G1 Similar to P1, and P G1 Similar to P7, i.e., P G1 / P1 and P G1 The change between / P7 and 1 does not exceed 10%. L4 and L6 are made of glass with a refractive index n > 1.7. Specifically, Table 25 shows the focal length P. i Each P i and P G1 The ratio between them and the refractive index of the lens element.

[0192]

[0193]

[0194] Table 25

[0195] Figure 12 Another example of the 2G pop-up optical lens system, numbered 1200, disclosed herein is shown. The lens system 1200 includes a pop-up lens 1202, divided into G1 and G2, an image sensor 1204, and optional optical elements 1206. The image sensor 1204 has an SD of 21.5 mm. Table 26 provides surface types, and Table 27 provides aspherical coefficients.

[0196]

[0197]

[0198] Table 26

[0199]

[0200] Table 27

[0201]

[0202]

[0203] Table 27 (continued)

[0204] The lens power sequence from L1 to L7 is as follows: +-+--+-(positive-negative-positive-negative-negative-positive-negative). P G1 Similar to P1, P G1 Similar to P5, P G1 Similar to P7, i.e., P G1 / P1 and P G1 / P5 and P G1 The change between / P7 and 1 does not exceed 20%. Specifically, Table 28 shows the focal length P. i And each P i and P G1 The ratio between them.

[0205] 1 0.09 0.90 2 -0.03 -0.32 3 0.01 0.06 4 -0.01 -0.10 5 -0.08 -0.83 6 0.13 1.39 7 -0.11 -1.11

[0206] Table 28

[0207] Figure 13 Another example of the 2G pop-up optical lens system, numbered 1300, disclosed herein is shown. Lens system 1300 includes a pop-up lens 1302 divided into G1 and G2, an image sensor 1304, and optional optical elements 1306. The SD of image sensor 1304 can be 21.5 mm. Table 29 provides surface types, and Table 30 provides aspherical coefficients.

[0208]

[0209]

[0210] Table 29

[0211]

[0212]

[0213] Table 30

[0214] The lens power sequence from L1 to L7 is as follows: +-+--+-(positive-negative-positive-negative-negative-positive-negative). P G1 Similar to P6, P G1 Similar to P7, i.e., P G1 / P6 and P G1 The change between / P7 and 1 does not exceed 20%. Specifically, Table 31 shows the focal length Pi and each P i and P G1 The ratio between them.

[0215] 1 0.03 0.39 2 -0.01 -0.13 3 0.05 0.57 4 -0.05 -0.63 5 -0.003 -0.04 6 0.08 0.96 7 -0.07 -0.88

[0216] Table 31

[0217] Figure 14Another example of the 2G pop-up optical lens system, numbered 1400, disclosed herein is shown. Lens system 1400 includes a pop-up lens 1402 divided into G1 and G2, an image sensor 1404, and optional optical elements 1406. The image sensor 1404 has an SD of 21.5 mm. G1 includes six lens elements, and G2 includes two lens elements. Table 32 provides surface types, and Table 33 provides aspherical coefficients.

[0218]

[0219]

[0220] Table 32

[0221]

[0222]

[0223] Table 33

[0224]

[0225] Table 33 (continued)

[0226] The lens power sequence from L1 to L8 is as follows: ++-+-++-(positive-positive-negative-positive-negative-positive-positive-negative). P G1 Similar to P6, and P G1 Similar to P8, i.e., P G1 / P6 and P G1 The change between / P8 and 1 does not exceed 20%. Specifically, Table 34 shows the focal length P. i And each P i and P G1 The ratio between them.

[0227]

[0228]

[0229] Table 34

[0230]

[0231] Table 35

[0232] Figure 15Another example of the 2G pop-up optical lens system, numbered 1500, disclosed herein is shown. Lens system 1500 includes a pop-up lens 1502 divided into G1 and G2, an image sensor 1504, and optional optical elements 1506. The image sensor 1504 has an SD of 21.5 mm. G1 includes six lens elements, and G2 includes one lens element. Table 35 provides surface types, and Table 36 provides aspherical coefficients.

[0233]

[0234] Table 36

[0235]

[0236]

[0237] Table 36 (continued)

[0238] The lens power sequence for lens elements L1 to L7 is as follows: +--+-++-(positive-negative-negative-positive-negative-positive-positive-negative). The deflection point of L1 is located at a distance of 2.16 mm from OA measured on the rear surface. P G1 Similar to P3, P G1 Similar to P6, and P G1 Similar to P8, i.e., P G1 / P3、P G1 / P6 and P G1 The change between / P8 and 1 does not exceed 10%. Specifically, Table 37 shows the focal length P. i And each P i and P G1 The ratio between them.

[0239] 1 0.07 0.79 2 -0.03 -0.36 3 -0.08 -0.97 4 0.11 1.28 5 -0.060 -0.72 6 0.09 1.05 7 0.01 0.06 8 -0.08 -0.93

[0240] Table 37

[0241] Figure 16 An example of the 1G pop-up optical lens system, numbered 1600, disclosed herein is shown. The lens system 1600 includes a pop-up lens 1602, an image sensor 1604, and optional optical elements 1606. The image sensor 1604 has an SD of 16.0 mm. Table 38 provides surface types, and Table 39 provides aspherical coefficients.

[0242]

[0243] Table 38

[0244]

[0245]

[0246] Table 39

[0247]

[0248] Table 39 (continued)

[0249] The thickness profile of L5 (measured along the z-axis) along the y-axis and starting from OA of lens 1602 has local maxima and local minima at OA, where the local minima are not located at the margin (or border) of L5, i.e., the local minima are located at a distance of less than DA / 2 from OA. As with L5 above, the thickness profile of L6 has local minima and local maxima at OA, where the local maxima are not located at the edge of L6. This characteristic of L5 and L6 is advantageous for obtaining lenses with low field curvature. The power sequence of lens elements L1 to L6 is positive-negative-positive-positive-positive-negative. L2 is a strong negative lens with a magnitude |f2| satisfying |f2| / EFL < 1.5.

[0250] Figure 17 Another example of the 1G pop-up optical lens system, numbered 1700, disclosed herein is shown. Lens system 1700 includes a pop-up lens 1702, an image sensor 1704, and optional optical elements 1706. The SD of image sensor 1704 can be 16.0 mm. Table 40 provides surface types, and Table 41 provides aspherical coefficients.

[0251]

[0252] Table 40

[0253]

[0254] Table 41

[0255]

[0256]

[0257] Table 41 (continued)

[0258] L1 and L2, and L3 and L4, are evenly spaced from each other. For all values ​​between OA and DA / 2 along the y-axis, L1 and L2 ("μ") are measured along the z-axis. L1-L2 ") as well as L3 and L4 ("μ L3-L4 The average distance between ”) is μ dL1-L2 =0.06mm and μ dL3-L4 =0.39mm, the standard deviation of the mean is σ dL1-L2=0.02mm and σ dL3-L4 =0.07mm. For L1, L2 and L3, L4, the ratios of σ and μ are respectively σ dL1-L2 / μ L1-L2 =0.36 and σ dL3-L4 / μ L3-L4 =0.17. The distance between L1 and L2 at OA ("d") L1-L2 ”) and T Lens The ratio d L1-L2 / T Lens =1.03%, the distance between L3 and L4 at OA ("d") L3-L4 ”) and T Lens The ratio d L3-L4 / T Lens =5.2%. L1 and L2 are very close to each other, similar to a double lens.

[0259] Figure 18 Another example of the 1G pop-up optical lens system, numbered 1800, disclosed herein is shown. Lens system 1800 includes a pop-up lens 1802, an image sensor 1804, and optional optical elements 1806. The SD of the image sensor 1804 can be 16.0 mm. Table 42 provides surface types, and Table 43 provides aspherical coefficients.

[0260] The power sequence of lens elements L1 to L7 is negative-positive-positive-negative-negative-positive-negative. L6 has a deflection point not located at OA, which is beneficial for achieving a lens with low field curvature. The thickness profile of L6 along the y-axis, starting from OA at lens 1802, has local maxima and minima at OA, where the local minima are not located at the edge of L6. This is beneficial for achieving low field curvature. All surfaces of L1-L5 are convex. The sign of the fi sequence of lens elements L1 to L8 is negative-negative-positive-negative-positive-positive-negative.

[0261] The distances between L1 and L2, L2 and L3, and L3 and L4 are uniform. For all values ​​between OA and DA / 2 along the y-axis, the average distance is μ. dL1-L2 =0.10mm, μ dL2-L3 =0.17mm and μ dL3-L4 =0.15mm, the standard deviation of the mean is σ dL1-L2 =0.09mm, σ dL2-L3 =0.07mm and σ dL3-L4 =0.02mm. The ratios of the standard deviations to the mean distances of L1 and L2, L2 and L3, and L3 and L4 are respectively σ dL1-L2 / μ L1-L2 =0.88, σ dL2-L3 / μ L2-L3 =0.43 and σdL3-L4 / μ L3-L4 =0.02. Distance d from OA L1-L2 =0.07mm, d L2-L3 =0.12mm, d L3-L4 =0.12mm and T Lens The ratios are d L1-L2 / T Lens =0.93%, d L2-L3 / T Lens =1.56%, d L3-L4 / T Lens =1.47%.

[0262]

[0263] Table 42

[0264]

[0265]

[0266] Table 43

[0267]

[0268] Table 43 (continued)

[0269] While the invention has been described with reference to certain examples and generally related methods, modifications and arrangements of the examples and methods will be apparent to those skilled in the art. The invention is not limited to the specific examples described herein, but only to the scope of the appended claims.

[0270] It should be understood that, for clarity, certain features of the subject matter of this disclosure described in the context of a single example may also be provided in combination within a single example. Conversely, for brevity, various features of the subject matter of this disclosure described in the context of a single example may also be provided individually or in any suitable sub-combination.

[0271] Furthermore, for clarity, this document uses the term "substantially" to imply the possibility of values ​​varying within an acceptable range. According to one example, the term "substantially" as used herein should be interpreted as implying a possible variation of up to 10% above or below any specified value. According to another example, the term "substantially" as used herein should be interpreted as implying a possible variation of up to 5% above or below any specified value. According to yet another example, the term "substantially" as used herein should be interpreted as implying a possible variation of up to 2.5% above or below any specified value.

[0272] Unless otherwise stated, using "and / or" between the last two members of the list of options indicates that it is appropriate and possible to select one or more of the listed options.

[0273] It should be understood that when a claim or specification refers to an element “a” or “an”, the reference should not be construed as meaning that only one of that element exists.

[0274] All patents and patent applications mentioned herein are incorporated herein by reference to the same extent that each individual patent or patent application is expressly and individually indicated to be incorporated herein by reference. Furthermore, any reference or identification of any reference in this application shall not be construed as an admission that such reference is used as prior art in this disclosure.

Claims

1. A lens system for a compact digital camera, characterized in that, include: An image sensor with a sensor diagonal SD; and A lens having a field of view (FOV) > 60 degrees and having N lens elements L1-LN arranged along a lens optical axis OA, wherein N ≥ 6, the lens optical axis OA starting from L1 on a target side and facing an imaging side, the lens elements being divided into two lens groups G1 and G2 separated by a large gap BG, the lens having a total ejection trajectory length (TTL) < 20 mm in a pop-up state and a total folding trajectory length (c-TTL) in a folded state, wherein the lens system is configured to switch from the pop-up state to the folded state by folding BG into a folded BG and vice versa, wherein BG > 0.25 x TTL, wherein SD ≥ 12 mm, and wherein a ratio c-TTL / SD < 0.

7.

2. The lens system according to claim 1, characterized in that, N is six, seven, or eight.

3. The lens system according to claim 1, characterized in that, G2 includes one or two lens elements.

4. The lens system according to claim 1, characterized in that, c-TTL / SD < 0.

65.

5. The lens system according to claim 1, characterized in that, c-TTL / SD<0.

6.

6. The lens system according to claim 1, characterized in that, c-TTL / SD<0.

5.

7. The lens system according to claim 1, characterized in that, c-TTL / SD>0.

3.

8. The lens system according to claim 1, characterized in that, TTL / SD ≤ 0.

7.

9. The lens system according to claim 1, characterized in that, TTL / SD ranges from 0.64 to 0.

78.

10. The lens system according to claim 1, characterized in that, c-TTL / TTL<0.

8.

11. The lens system according to claim 1, characterized in that, BG>0.3 x TTL.

12. The lens system according to claim 1, characterized in that, BG>0.35 x TTL.

13. The lens system according to claim 1, characterized in that, BG ranges from 4.5 mm to 8.1 mm.

14. The lens system according to claim 1, characterized in that, The folded BG is in the range of 0.2 mm to 4.4 mm.

15. The lens system according to claim 1, characterized in that, TTL ranges from 10.8 mm to 16.9 mm.

16. The lens system according to claim 1, characterized in that, The lens system has an f-number f / #, where f / # ≤ 2.

5.

17. The lens system according to claim 16, characterized in that, f / # ≤ 2.25。 18. The lens system according to claim 16, characterized in that, f / # ≤ 2。 19. The lens system according to claim 1, characterized in that, The SD is 21.5 mm.

20. The lens system according to claim 1, characterized in that, The SD is 14.3 mm.

21. The lens system according to claim 1, characterized in that, SD ranges from 10 mm to 30 mm.

22. The lens system according to claim 1, characterized in that, SD ranges from 14 mm to 22 mm.

23. The lens system according to claim 1, characterized in that, FOV>70 degrees.

24. The lens system according to claim 1, characterized in that, FOV ≥ 80 degrees.

25. The lens system according to claim 1, characterized in that, G1 can move relative to G2 and relative to the image sensor to focus, or G1 and G2 can move together relative to the image sensor to focus.

26. The lens system according to claim 1, characterized in that, L1 and L4 are made of glass with a refractive index n > 1.

7.

27. The lens system according to claim 1, characterized in that, L4 and L6 are made of glass with a refractive index n > 1.

7.

28. The lens system according to claim 1, characterized in that, L4 is made of glass with a refractive index n > 1.

7.

29. The lens system according to claim 1, characterized in that, L1 has a deflection point that is not located at the OA of the lens.

30. The lens system according to claim 29, characterized in that, A deflection point on the front surface of L1 is located at a distance d measured from an optical axis of the lens. f At the location, 1.5 millimeters <d f <3.5 mm.

31. The lens system according to claim 29, characterized in that, A deflection point on the rear surface of L1 is located at a distance d measured from an optical axis of the lens. r At the location, 1.5 millimeters <d r <3.5 mm.

32. The lens system according to claim 1, characterized in that, The ratio of the 1-joule power PG1 of G1 to the 1-joule power PG2 of G2 satisfies -1.81 ≤ PG1 / PG2 ≤ -0.

9.

33. The lens system according to claim 1, characterized in that, N=7, where the lens power sequence from L1 to L7 is positive-negative-negative-positive-negative-positive-negative.

34. The lens system according to claim 1, characterized in that, N=7, where the lens power sequence from L1 to L7 is positive-negative-positive-negative-negative-positive-negative.

35. The lens system according to claim 1, characterized in that, N=7, where the lens power sequence from L1 to L7 is positive-positive-negative-positive-negative-positive-negative.

36. The lens system according to claim 1, characterized in that, N=7, where the lens power sequence from L1 to L7 is positive-negative-positive-positive-negative-positive-negative.

37. The lens system according to claim 1, characterized in that, N=8, where the lens power sequence from L1 to L8 is positive-positive-negative-positive-negative-positive-positive-negative.

38. The lens system according to claim 1, characterized in that, N=8, wherein the sequence of lens powers from L1 to L8 is positive-negative-negative-positive-negative-positive-positive-negative.

39. The lens system according to claim 1, characterized in that, The last two lens elements in G1 collectively have an Abbe number V and an effective focal length EFL, wherein the Abbe number V satisfies 50<V<120, and the effective focal length EFL satisfies 13 mm<EFL<50 mm.

40. The lens system according to claim 1, characterized in that, The variation amplitude of the focal length magnitude |f1| of L1 and the focal length magnitude |f6| of L6 is less than 25%, wherein both |f1| and |f6| are less than 45% of each of the respective focal length magnitudes |f2|, |f3|, |f4| and |f5| of the lens elements L2, L3, L4 and L5.

41. The lens system according to claim 1, characterized in that, The lens elements L1, L2, L3 and L4 have a meniscus shape relative to the object side, wherein the lens elements L5 and L6 have a meniscus shape relative to the imaging side.

42. The lens system according to claim 1, characterized in that, The variation amplitude of the focal length magnitude |f4| of L4 is greater than 50% of each of the respective focal length magnitudes |f1|, |f2|, |f3|, |f5| and |f6| of the lens elements L1, L2, L3, L5 and L6.

43. The lens system according to claim 1, characterized in that, The variation amplitude of the focal length magnitude |f6| of L6 is greater than 100% of each of the respective focal length magnitudes |f1|, |f2|, |f3|, |f4| and |f5| of the lens elements L1, L2, L3, L5 and L6.

44. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio of the focal length P3 to the focal length P3 of L3 G1 The change in / P3 is no more than 10% of 1.

45. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio of the focal length of L6 to that of P6 is P. G1 The change in / P6 is no more than 10% of 1.

46. ​​The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P to the focal value P3 of L3 G1 / P3, and P G1 The ratio P of the 1-joule power P6 to L6 G1 / P6, the change in both is no more than 20% of 1.

47. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P of the one-joule power P3 of L6 G1 / P6, and P G1 The ratio P of L7 to P7 is P G1 / P7, the change in both is no more than 20% of 1.

48. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P of the focal length P1 to L1 G1 The change in / P1 is no more than 20% of 1.

49. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P of the focal length P1 to L1 G1 / P1, P G1 The ratio P of L5 to P5 is P G1 / P5, and P G1 The ratio P of L7 to P7 is P G1 / P7, the variation of the three is no more than 20% of 1.

50. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P of the 1-joule P6 to L6 is P G1 / P6, and P G1 The ratio of the power of L8 to P8 is P. G1 / P8, the change in both is no more than 20% of 1.

51. The lens system according to claim 1, characterized in that, G1's one-focal-length P G1 The ratio P to the focal value P3 of L3 G1 / P3, P G1 The ratio P of the 1-joule P6 to L6 is P G1 / P6, and P G1 The ratio of the power of L8 to P8 is P. G1 / P8, the variation of the three is no greater than 10% of 1.

52. The lens system according to any one of claims 1-51, characterized in that, The lens system is included in a pop-up camera, wherein the pop-up camera is included in a mobile device, and the pop-up camera supports the mobile device with an IP68 rating.

53. The lens system according to any one of claims 1-51, characterized in that, The lens system is included in a pop-up camera, wherein the pop-up camera is included in a smartphone.

54. The lens system according to any one of claims 1-51, characterized in that, The lens system is included in a pop-up camera, wherein the pop-up camera is included in a tablet computer.

55. A lens system for a compact digital camera, characterized in that, comprising: an image sensor, having a sensor diagonal SD; and a lens, having a field of view FOV>60 degrees, N lens elements L1-LN with N≥6 arranged along a lens optical axis OA, and an f-number f / #, wherein the lens optical axis OA extends from L1 on an object side towards an imaging side, the lens elements are divided into two lens groups G1 and G2 separated by a large gap BG, the lens has a total pop-up track length TTL<20 mm in a pop-up state, and a total collapsed track length c-TTL in a collapsed state, wherein the lens system is configured to switch from the pop-up state to the collapsed state and vice versa by collapsing BG into a collapsed BG, wherein BG>0.25×TTL, wherein SD≥12 mm, wherein a ratio c-TTL / SD<0.7, and wherein f / #≤2.

5.

56. The lens system according to claim 55, characterized in that, f / # ≤ 2.25。 57. The lens system according to claim 55, characterized in that, f / # ≤ 2。 58. The lens system according to any one of claims 55-57, characterized in that, The lens system is included in a pop-up camera, wherein the pop-up camera is included in a mobile device, and the pop-up camera supports the mobile device with an IP68 rating.

59. The lens system according to any one of claims 55-57, characterized in that, The lens system is included in a pop-up camera, which is included in a mobile device.

Images