Slim pop-out wide camera lenses

Abstract

A pop-up lens system for a small digital camera includes an image sensor and a lens with a field of view (FOV) > 60 degrees, and has i lens elements L1-Li from the object side to the image side starting from L1. Each lens element Li has its own focal length fi. The lens elements are separated by a large gap (BG) and divided into two lens groups G1 and G2. The total pop-up track length TTL in the pop-up state is < 20 mm, and the total folding track length c-TTL in the folded state is c-TTL, where BG > 0.25 x TTL. Lens group G1 can be moved relative to lens group G2 and the image sensor for focusing, or lens group G1 and lens group G2 can be moved together relative to the image sensor for focusing, and the ratio c-TTL / TTL < 0.7.

Description

Technical Field

[0001] Cross-referencing of related applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 141,128, filed January 25, 2021, which is incorporated herein by reference in its entirety.

[0003] This disclosure generally relates to digital cameras, and more particularly to digital cameras with pop-up mechanisms and lenses. Prior Technology

[0004] In this application, the following symbols and abbreviations are used for optical and other characteristics mentioned in the overall specification and drawings; these are all terms known in the art:

[0005] Total Track Length (TTL): The maximum distance between a point on the surface S1 in front of a first lens element L1 and an image sensor, measured along an axis parallel to the optical axis of a lens when the system is focused on an infinitely distant target.

[0006] Back Focal Length (BFL): The minimum distance between the image sensor and a point on surface S2N after the last lens element LN, measured along an axis parallel to the optical axis of a lens when the system is focused on an infinitely distant target.

[0007] Effective Focal Length (EFL): In a lens (a combination of lens elements L1 to LN), the distance between a rear principal point P' and a rear focal point F'.

[0008] f-number (f / #): The ratio of EFL to the diameter of the entrance pupil.

[0009] Multi-aperture digital cameras (or multi-camera systems) are standard in today's mobile handheld electronic devices (or simply "mobile devices," such as smartphones, tablets, etc.). Generally, a wide-angle camera with a field of view (FOVW) of 70 to 90 degrees serves as the main (or "primary") camera of the mobile device.

[0010] A major challenge is designing wide-angle cameras that support higher image quality (IQ) while still remaining suitable for slim mobile devices with a device height of, for example, less than 10 mm. One promising approach to improving the IQ of wide-angle cameras is to incorporate larger image sensors.

[0011] Figure 1A schematically illustrates the definitions of various camera entities such as TTL, EFL, and BFL. In most miniature lenses used in multi-camera systems for mobile devices, TTL is greater than EFL, as shown in Figure 1A, for example, for a wide-angle lens.

[0012] Figure 1B schematically illustrates 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. For a fixed width / height ratio and a (rectangular) image sensor, the sensor diagonal (SD) is proportional to the sensor's width and height. For example, the SD of a 1 / 1.2" sensor is 14.3 mm. The relationship between the horizontal FOV, EFL, and sensor width S is as follows:

[0013] This shows that to achieve a camera with a larger image sensor but a similar FOV, a larger EFL is required. 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, which results in a larger TTL, which is undesirable because it hinders the integration of a wide-angle camera into a mobile device.

[0014] Pop-up cameras resolve this conflict. They combine the advantage of a large TTL when the camera is in use ("pop-up state") with a slim design that folds the TTL into a c-TTL ("c-TTL") when the camera is not in use ("folded state"). c-TTL is compatible with the height dimensions of modern mobile devices. The pop-up camera can only operate as a camera in this pop-up state. Pop-up cameras are described, for example, in co-owned international patent application PCT / IB2020 / 058697.

[0015] Having a wide-angle camera lens design that supports pop-up wide-angle cameras is beneficial, including large image sensors, such as 1 / 1.2” or larger, i.e., having a sensor diagonal SD greater than or equal to 14.3 mm. Summary of the Invention

[0016] In various examples, a lens system for a small digital camera is provided, comprising an image sensor with a sensor diagonal and a lens with a field of view (FOV) > 60 degrees and 8 ≥ N ≥ 6 lens elements L1-LN from the object side to the image side, starting from L1. Each lens element Li has a focal length fi of size |fi|. These lens elements are separated by a large gap (BG) and divided into two lens groups, namely a first lens group G1 and a second lens group G2. The lens has a total pop-out track length (TTL) of less than 20 mm in a pop-out state and a collapsed state... The lens system is configured to switch from the pop-up state to the folded state (and vice versa) through a large folding gap, wherein the large gap is greater than 0.25 times the pop-up total track length (BG>0.25xTTL), wherein the sensor diagonal is greater than or equal to 12 mm (SD≥12 mm), and wherein the ratio of the folded total track length to the sensor diagonal is less than 0.7 (c-TTL / SD<0.7).

[0017] In some examples, the first lens group G1 may include five or more lens elements, and the second lens group G2 may include one or two lens elements.

[0018] In some examples, the ratio of the total length of the folded track to the total length of the pop-up track is less than 0.7 (c-TTL / TTL<0.7). In some examples, the ratio of the total length of the folded track to the total length of the pop-up track is less than 0.65 (c-TTL / TTL<0.65).

[0019] In some examples, the large gap is greater than 0.3 times the total length of the ejected track (BG > 0.3 x TTL). In some examples, the large gap is greater than 0.35 times the total length of the ejected track (BG > 0.35 x TTL).

[0020] In some examples, the thickness TG1 of one of the first lens groups G1 is greater than 0.35 times the total ejection track length TTL and less than 0.47 times (0.35 x TTL) the total ejection track length TTL. <TG1<0.47xTTL)。

[0021] In some examples, the focal power PG1 of the first lens group G1 is greater than 0 (PG1>0), and the focal power PG2 of the second lens group G2 is less than 0 (PG2<0). In some examples, a ratio between the focal power PG1 of the first lens group G1 and the focal power PG2 of the second lens group G2 is greater than or equal to -1.81 and less than or equal to -0.9 (-1.81≤PG1 / PG2≤-0.9).

[0022] In some examples, i = 6, and an order of the plural lens powers P1 to P6 of the plural lens elements L1 to L6 can be positive, negative, positive, negative, positive, negative.

[0023] In some examples, i = 7, and an order of the plural lens powers P1 to P7 of the plural lens elements L1 to L7 can be positive, negative, negative, positive, negative, positive, negative, or positive, negative, positive, negative, negative, positive, negative, or positive, positive, negative, positive, negative, positive, negative, or positive, negative, positive, positive, negative, positive, negative

[0024] In some examples, i = 8, and an order of the plural lens powers P1 to P8 of the plural lens elements L1 to L8 can be positive, positive, negative, positive, negative, positive, positive, negative, or positive, negative, negative, positive, negative, positive, positive, negative.

[0025] In some examples, the last two of the lens elements in the first lens group G1 can jointly have a total value V of Abbe numbers of the last two lens elements and an effective focal length EFL, where the total value V is greater than 50 and less than 120 (50<V<120), and the effective focal length EFL is greater than 13 millimeters and less than 50 millimeters (13mm<EFL<50mm).

[0026] In some examples, a difference between the magnitude |f1| of the focal length of the lens element L1 and the magnitude |f6| of the focal length of the lens element L6 can be less than 25%, and the magnitudes |f1| and |f6| can each be less than 45% of the respective magnitudes |f2|, |f3|, |f4|, and |f5| of the focal lengths of the lens element L2, the lens element L3, the lens element L4, and the lens element L5.

[0027] In some examples, the lens element L1, the lens element L2, the lens element L3 and the lens element L4 have a crescent shape relative to the object side, and the lens element L5 and the lens element L6 have a crescent shape relative to the image side.

[0028] In some examples, the difference between the focal length |f4| of the lens element L4 and the respective focal lengths |f1|, |f2|, |f3|, |f5|, and |f6| of the lens elements L1, L2, L3, L5, and L6 can be greater than 50%.

[0029] In some examples, the difference between the focal length of the lens element L6, |f6|, and the focal lengths of the lens elements L1, L2, L3, L4, and L5, respectively, can be greater than 100%.

[0030] In some examples, the ratio of the power PG1 of the first lens group G1 to the power P3 of the lens element L3 differs from 1 by no more than 10%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P6 of the lens element L6 differs from 1 by no more than 10%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P3 of the lens element L3, and the ratio of the power PG1 of the first lens group G1 to the power P6 of the lens element L6, differs from 1 by no more than 20%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P6 of the lens element L6, and the ratio of the power PG1 of the first lens group G1 to the power P7 of the lens element L7, differs from 1 by no more than 20%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P1 of the lens element L1 differs from 1 by no more than 20%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P1 of the lens element L1, the ratio of the power PG1 of the first lens group G1 to the power P5 of the lens element L5, and the ratio of the power PG1 of the first lens group G1 to the power P7 of the lens element L7 differs from 1 by no more than 20%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P6 of the lens element L6, and the ratio of the power PG1 of the first lens group G1 to the power P8 of the lens element L8 differs from 1 by no more than 20%. In some examples, the ratio of the power PG1 of the first lens group G1 to the power P3 of the lens element L3, the ratio of the power PG1 of the first lens group G1 to the power P6 of the lens element L6, and the ratio of the power PG1 of the first lens group G1 to the power P8 of the lens element L8 differs from 1 by no more than 10%.

[0031] In some examples, one or more lens elements may be made of glass, and the refractive index n of each of the one or more lens elements may be greater than 1.7.

[0032] In some examples, the lens element L4 is made of glass and has a refractive index greater than 1.7.

[0033] In some examples, the lens element L2, the lens element L4, and the lens element L6 are made of glass and each has a refractive index greater than 1.7.

[0034] In some examples, the lens element L4 and the lens element L6 are made of glass and each has a refractive index greater than 1.7.

[0035] In some examples, a deflection point on a front surface of the lens element L1 is located at a distance df measured from one of the optical axes of the lens, wherein the distance df is greater than 1.5 mm and less than 3.5 mm (1.5 mm). <d-f<3.5mm)。

[0036] In some examples, a deflection point on a rear surface of the lens element L1 is located at a distance dr measured from one of the optical axes of the lens, wherein the distance dr is greater than 1.5 mm and less than 3.5 mm (1.5 mm). <d-r<3.5mm)。

[0037] In some examples, such as those above or below, a lens system can be included in a pop-up camera with a sensor whose sensor diagonal SD ranges from 10 to 30 millimeters (mm).

[0038] In some examples, such as those above or below, a lens system can be included in a pop-up camera with a sensor whose sensor diagonal SD ranges from 14 to 22 millimeters (mm).

[0039] In some examples, such as those mentioned above or below, a lens system can be included in a pop-up camera, which is included in a smartphone.

[0040] In various examples, a plurality of lens systems are provided for a lens system for a small digital camera, including an image sensor having a sensor diagonal SD, and a lens with a field of view (FOV) > 60 degrees, the lens having an f-number (f / #), a lens thickness (“TLens”), a back focal length (BFL) and an effective focal length (EFL), and having 8 ≥ N ≥ 6 lens elements L1-LN from an object side to an image side, each lens element Li having a respective focal length fi of size |fi|, wherein the lens system is configured to switch from a pop-up state to a folded state through the folded back focal length BFL (and vice versa), wherein the sensor diagonal SD is greater than or equal to 12 mm (SD ≥ 12 mm), wherein the back focal length is greater than 0.15 times the total pop-up track length (BFL > 0.15 x TTL), and wherein a ratio of the total folded track length to the sensor diagonal is less than 0.65 (c - TTL / SD < 0.65). Simple Explanation of the Diagram

[0041] The following description, with reference to the diagrams listed after this paragraph, illustrates non-limiting examples of the examples disclosed in this case. Identical structures, elements, or parts appearing in more than one figure are generally labeled with the same numerical designation in all the figures in which they appear. If the same element is shown but numbered only in one figure, it is assumed that they have the same numbering in all the figures in which they appear. The diagrams and description are intended to describe and illustrate the examples disclosed in this case and should not be considered limiting in any way. In the diagrams:

[0042] Figure 1A schematically illustrates the definitions of various entities such as TTL and EFL; Figure 1B shows the definitions of FOV, EFL, and S for a thin lens, which are approximately or equivalent. Figure 2A schematically shows a pop-up optical lens system disclosed herein, focused to infinity in a pop-up state; Figure 2B schematically shows the pop-up system of Figure 2A in a folded state; Figure 2C schematically shows another pop-up optical lens system disclosed herein in a pop-up state; Figure 2D schematically shows the pop-up system of Figure 2C in a folded state; Figure 3A shows the pop-up system of Figure 2A focusing at a closer (e.g., 50 cm) distance according to a first method; Figure 3B shows the pop-up system of Figure 2A focusing at a closer distance (e.g., 50 cm) using a second method; Figure 4 shows an example of a pop-up optical lens system disclosed in this paper; Figure 5 shows another example of a pop-up optical lens system disclosed in this paper; Figure 6 shows yet another example of a pop-up optical lens system disclosed in this paper; Figure 7 shows yet another example of a pop-up optical lens system disclosed in this paper; Figure 8 shows yet another example of a pop-up optical lens system disclosed in this paper; Figure 9 shows yet another example of a pop-up optical lens system disclosed in this paper; Figure 10 shows yet another example of a pop-up optical lens system disclosed herein; Figure 11 shows yet another example of a pop-up optical lens system disclosed herein; Figure 12 shows yet another example of a pop-up optical lens system disclosed herein; Figure 13 shows yet another example of a pop-up optical lens system disclosed herein; Figure 14 shows yet another example of a pop-up optical lens system disclosed herein; Figures 15, 16, 17 and 18 show further examples of the plurality of pop-up optical lens systems disclosed herein. Implementation

[0043] Figure 2A shows an example of a "2-group" (or "2G") pop-up optical lens system 200, which includes a pop-up lens 202 and an image sensor 204 disclosed herein. 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 large gap (BG): a first lens group ("G1") on the object side and a second lens group ("G2") on the sensor side. The thickness of the first lens group G1 is denoted by TG1. The lens 202 includes a plurality of N lens elements Li (where "i" is an integer between 1 and N, and N can be, for example, between 5 and 9). Lens element L1 is the lens element closest to the object side, and LN is the lens element closest to the image 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 front surface S2i-1 (the symbol "2i-1" is the number of the front surface) and a rear surface S2i (the symbol "2i" is the number of the rear surface). This numbering is used conventionally throughout the specification. Alternatively, as done throughout the specification, lens surfaces are marked "Sk", where k ranges from 1 to 2N. In some cases, the front and rear surfaces may be aspherical. However, this is not a limitation.

[0044] As used herein, the term "front surface" for each lens element refers to the surface of a lens element located closer to the camera entrance (camera object side), while the term "rear surface" refers to the surface of a lens element located closer to the image sensor (camera image side).

[0045] Each lens group includes one or more lens elements Li. The first lens group G1 may include five or more lens elements, and the second lens group G2 may include one or two lens element elements. The second lens group G2 can be used as a field lens as is known in the art.

[0046] Figure 2B shows the 2G pop-up optical lens system 200 in a folded state. The large gap BG is folded into a folded large gap (labeled "c-BG"), that is, the distance between the first lens group G1 and the second lens group G2 is reduced, resulting in a folded total track length ("c-TTL"). The folded large gap c-BG can range from 0.2 mm to 5 mm. Only BG changes. Other distances in the pop-up optical lens system 200, such as the distances between the plurality of lens elements respectively included in the first lens group G1 and the second lens group G2, remain unchanged.

[0047] Figure 2C shows an example of a "1G" (or "1-group") pop-up optical lens system 250, which includes a pop-up lens 252 with a thickness TLens and an image sensor 254 disclosed herein. The pop-up optical lens system 250 is shown in a pop-up state. The pop-up lens 252 is not divided into two lens groups. Figure 2D shows the 1G pop-up optical lens system 250 in a folded state. The back focal length BFL is folded into a folded back focal length (labeled "c-BFL"), i.e., the distance between the lens 252 and the image sensor 254 is reduced, resulting in a folded total track length c-TTL. The folded back focal length c-BFL can range from 0 to 3 mm. Only the BFL changes. Other distances in the pop-up optical lens system 250, such as the distances between the plurality of lens elements of the lens 252, remain unchanged.

[0048] The 2G pop-up optical lens system 200 and the 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 optical image stabilization," in which the lens moves relative to an image sensor and a camera carrying a mobile device for optical image stabilization, or "sensor-shift optical image stabilization," in which the image sensor moves relative to the lens and a camera carrying a mobile device for optical image stabilization.

[0049] All the pop-up optical lens systems disclosed herein can be used in multiple examples of the pop-up camera described in the commonly owned PCT patent application PCT / IB2020 / 058697.

[0050] Figure 2A shows a 2G pop-up optical lens system 200 focused to infinity. Figure 3A shows a 2G pop-up optical lens system 200 focused to a closer object, for example, focused to 1m according to a first focusing method called "G1-G2 focusing". For G1-G2 focusing, the first lens group G1 and the second lens group G2 move relative to each other by a focusing stroke ΔfG1-G2=TFocus-BG, from a thickness given by BG to a thickness given by TFocus. BFL remains unchanged, but BG changes. For all 2G lens systems disclosed herein, multiple values ​​for BG and TFocus are given in Table 1. #BG indicates the surface that is changed for G1-G2 focusing.

[0051] Figure 3B illustrates focusing on a closer object, for example, focusing to 1m using a 2G pop-up optical lens system 200 according to a second focusing method called "lens focusing". For lens focusing, the first lens group G1 and the second lens group G2 move together as a single lens relative to the image sensor by a focusing stroke ΔfLens. BG remains constant, but BFL changes. Lens focusing is a standard method used in state-of-the-art digital cameras in mobile electronic devices.

[0052] All 2G pop-up optical lens systems disclosed below can be focused via G1-G2 focusing and lens focusing. All 1G pop-up optical lens systems disclosed below are focused via lens focusing.

[0053] All pop-up optical lens systems disclosed below are shown in a pop-up state, including a pop-up camera of the optical lens system that is operable.

[0054] In a folded state, examples of all 2G pop-up optical lens systems have a c-BG ranging from 0.2 mm to 4.4 mm. In a folded state, examples of all 1G pop-up optical lens systems have a c-BFL ranging from 1.0 mm to 2.5 mm. A smaller c-BG and c-BFL respectively facilitate the realization of a thin camera module that can be integrated into a thin mobile device such as a smartphone. For clarity, all lens systems disclosed herein can be advantageously included or incorporated into multiple smartphones.

[0055] Table 1 shows multiple values ​​and ranges included in the lens system examples 400 to 1800 disclosed below. SD, TTL, c-TTL, BG, c-BG, EFL, TG1, TFocus, dL1-L2, TLens, fLS, and fN-1 are in millimeters; half field of view (“HFOV”) and 35mm equivalent focal length (“35mmEqFL”) are given in degrees. Abbe number v, #LS, and f number (“f / #”) are unitless, and focal length is in the reciprocal of meters [1 / m]. c-TTLMIN and c-TTLMAX refer to the minimum and maximum c-TTL achievable in their respective examples. In general, in Table 1, “MIN” and “MAX” refer to the minimum and maximum values ​​within a range, respectively.

[0056] "#LS" represents the number of the strongest lens element in a lens, i.e., the lens element with the smallest positive focal length f. "fLS" represents the f of the strongest lens element in a lens. "fN-1" represents the f of the (N-1)th (second to last) lens element in a lens. dL1-L2 represents the distance (or air gap) between L1 and L2.

[0057] For a 2G type lens system, LM refers to the last lens element in the first lens group G1. The indicator “LM-1+LM” refers to the attribute of the last two lens elements in the first lens group G1 together. For example, in Example 400, LM-1+LM refers to the attribute of L5 and L6 together; in Example 1500, LM-1+LM refers to the attribute of L6 and L7 together, and so on. For G1-G2 focusing, BG represents the thickness of the surface “#BG” when focused to infinity. “TFocus” represents the thickness of the surface “#BG” when focused to 1m and 0.5m. The focal length of the entire first lens group G1 is marked as PG1, the focal length of the entire second lens group G2 is marked as PG2, and the focal length of an individual lens element is marked by the element number, i.e., the focal length of lens element L1 is marked as P1, the focal length of lens element L2 is marked as P2, and so on. TG1 indicates the thickness of the first lens group G1. Table 1 Table 1 (continued)

[0058] In all 2G lens system examples 400 to 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.

[0059] In all the 1G lens system examples 1600 to 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.

[0060] Figure 4 shows an example of the 2G pop-up optical lens system disclosed herein and designated 400. The lens system 400 includes a pop-up lens 402 divided into two lens groups G1 and G2, an image sensor 404, and optionally, an optical element 406. The optical element 406 may be, for example, an infrared (IR) filter and / or a glass image sensor dust cover. The image sensor 404 may have a sensor diagonal SD of 14.3 mm. The first lens group G1 includes six lens elements, and the second lens group G2 includes one lens element. Optical rays pass through the lens 402 and form an image on the image sensor 404. Figure 4 shows three fields, each with three rays: an upper edge ray, a lower edge ray, and a main ray. All further diagrams also show these three rays.

[0061] Detailed optical and surface data for the pop-up lens 402 are given in Tables 2 and 3. Table 2 provides the surface types, and Table 3 provides the aspherical coefficients. Surface types include:

[0062] a) Plano: A flat surface with no curvature.

[0063] b) Q-Type 1 (QT1, also known as Q-type) surface sag formula:

[0064] c) Formula for sag of uniform aspherical (ASP) surface:

[0065] Where {z,r} are standard cylindrical polar coordinates, c is the paraxial curvature of the surface, k is the conic parameter, rnorm (Norm Radius, NR) is typically half the surface aperture (CA), and An is the aspherical coefficient, as shown in the lens datasheet. The Z-axis is positive towards the image side. The CA value is given as an aperture radius, i.e., D / 2. The reference wavelength is 555.0 nanometers (nm). Except for the refractive index (“Index”) and Abbe number (Abbe #), the units are in millimeters. Each lens element Li has its own focal length fi, given in Table 2. The field of view (FOV) is given in the form of half FOV (HFOV). The definitions of surface type, Z-axis, CA value, reference wavelength, units, focal length, and HFOV apply to all the following tables. Table 2 Table 3 Table 3 (continued)

[0066] The deflection point of lens element L1 is located at a distance of 1.884 mm measured from the optical axis (“OA”) on the rear surface. The focal lengths of L1 (|f1|) and L6 (|f6|) are similar, meaning their size difference may be less than 30%. The sizes |f1| and |f6| are paired and much smaller than the focal lengths of all individual lens elements L2, L3, L4, and L5, i.e., |f1|, |f6| << |f2|, |f3|, |f4|, |f5|. For example, |f2|, |f3|, |f4|, and |f5| may be greater than |f1| and |f6| by more than 45%. The ratio of the power of L1 (P1) to PG1 satisfies P1 / PG1 = 0.89. Specifically, Table 4 shows the ratios |fi / f1| and |fi / f6|, as well as the ratio between each Pi and PG1. Table 4

[0067] Figure 5 shows another example of the 2G pop-up optical lens system disclosed herein and designated 500. The lens system 500 includes a pop-up lens 502 divided into two lens groups G1 and G2, an image sensor 504, and optionally, an optical element 506. The image sensor 504 may have a 14.3 mm sensor diagonal SD (1 / 1.2” sensor). Table 5 provides surface types, and Table 6 provides aspherical coefficients. Table 5 Table 6 Table 6 (continued)

[0068] The order of focal length from lens element L1 to lens element L7 is as follows: +--+-+- (positive, negative, negative, positive, negative, positive, negative). Specifically, Table 7 shows the focal length Pi from L1 to L7. L1, L2, and L4 each form a meniscus relative to the object side. L5 and L6 each form a meniscus relative to the image side. |f4| is much smaller than all the focal lengths |f| of individual lens elements L1, L2, and L3. That is, |f4| << |f1|, |f2|, |f3|. For example, |f1|, |f2|, and |f3| may be greater than |f4| by more than 50%. L4 is made of glass with a refractive index n > 1.7. PG1 and P3 are similar, meaning that the difference between PG1 / P3 and 1 does not exceed 10%. Specifically, Table 7 shows the focal length Pi, the ratio |f / f4|, and the ratio between each Pi and PG1. Table 7

[0069] Figure 6 shows another example of the 2G pop-up optical lens system disclosed herein and designated 600. The lens system 600 includes a pop-up lens 602 divided into G1 and G2, an image sensor 604, and optionally, an optical element 606. The image sensor 604 may have a 21.5 mm sensor diagonal SD (1 / 0.8” sensor). Table 8 provides surface types, and Table 9 provides aspherical coefficients. Table 8 Table 9 Table 9 (continued)

[0070] The focal lengths from lens element L1 to lens element L7 are in the following order: +-+--+- (positive, negative, positive, negative, negative, positive, negative). L5 and L6 (the last two lens elements of the first lens group G1) together have an Abbe number (Abbe - #L5+L6) = 71.87 and an effective focal length EFLL5+L6 = 17.51 ​​mm. |f6| is much smaller than the focal lengths of all individual lens elements L1, L2, L3, L4, and L5, i.e., |f6| << |f1|, |f2|, |f3|, |f4|, |f5|. For example, |f1|, |f2|, |f3|, |f4|, and |f5| may be greater than |f6| by more than 100%. L2, L4, and L6 are made of glass with a refractive index n > 1.7. PG1 and P6 are similar, i.e., the difference between PG1 / P6 and 1 does not exceed 10%. Specifically, Table 10 shows the focal length Pi, the ratio |f / f6|, and the ratio between each Pi and PG1. Table 10

[0071] Figure 7 shows another example of the 2G pop-up optical lens system disclosed herein and designated 700. The lens system 700 includes a pop-up lens 702 divided into G1 and G2, an image sensor 704, and optionally, an optical element 706. The image sensor 704 may have a 21.5 mm sensor diagonal SD (1 / 0.8” sensor). Table 11 provides surface types, and Table 12 provides aspherical coefficients. Table 11 Table 12 Table 12 (continued)

[0072] The focal lengths from lens element L1 to lens element L7 are in the following order: ++-+-+- (positive, positive, negative, positive, negative, positive, negative), see Table 13. The Abbe number (Abbe - #L5+L6) of L5 and L6 (the last two lens elements of the first lens group G1) is 79.38, and the effective focal length is EFLL5+L6 = 49.75 mm. |f4| is much smaller than all the focal lengths of individual lens elements L1, L2, L3, L5, and L6, i.e., |f4| << |f1|, |f2|, |f3|, |f5|, |f6|. For example, |f1|, |f2|, |f3|, |f5|, and |f6| may be greater than |f4| by more than 80%.

[0073] The deflection point of lens element L1 is located at a distance of 3.275 mm from the optical axis (OA) of the front surface and at a distance of 2.749 mm from the optical axis (OA) of the rear surface. PG1 and P3, as well as PG1 and P6, are similar, meaning the difference between PG1 / P3 and PG1 / P6 and 1 does not exceed 20%. L4 is made of glass with a refractive index n > 1.7. Specifically, Table 13 also shows the power Pi, the ratio between each Pi and PG1, the ratio |f / f4|, and the refractive index of each lens element. Table 13

[0074] Figure 8 shows another example of the 2G pop-up optical lens system disclosed herein and designated 800. The lens system 800 includes a pop-up lens 802 divided into G1 and G2, an image sensor 804, and optionally, an optical element 806. The image sensor 804 may have a sensor diagonal SD of 21.5 mm. Table 14 provides only surface types, and Table 15 provides aspherical coefficients. Table 14 Table 15 Table 15 (continued)

[0075] The power order from lens element L1 to lens element 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 measured from the optical axis (OA) of the front surface and at a distance of 1.95 mm measured from the optical axis (OA) of the rear surface. PG1 and P6, as well as PG1 and P7, are similar, meaning that the difference between PG1 / P6 and PG1 / P7 and 1 does not exceed 20%. Specifically, Table 16 shows the power Pi and the ratio between each Pi and PG1. Table 16

[0076] Figure 9 shows another example of the 2G pop-up optical lens system disclosed herein and designated 900. The lens system 900 includes a pop-up lens 902 divided into G1 and G2, an image sensor 904, and optionally, an optical element 906. The image sensor 904 may have a sensor diagonal SD of 21.5 mm. The first lens group G1 includes five lens elements, and the second lens group G2 includes one lens element. Table 17 provides surface types, and Table 18 provides aspherical coefficients. Table 17 Table 18 Table 18 (continued)

[0077] The power order from lens element L1 to lens element L6 is as follows: +-+-+- (positive, negative, positive, negative, positive, negative). PG1 and P1 are similar, meaning the difference between PG1 / P1 and 1 does not exceed 20%. Specifically, Table 19 shows the power Pi and the ratio between each Pi and PG1. Table 19

[0078] Figure 10 shows another example of the 2G pop-up optical lens system disclosed herein and numbered 1000. The lens system 1000 includes a pop-up lens 1002 divided into G1 and G2, an image sensor 1004, and optionally, an optical element 1006. The image sensor 1004 may have a sensor diagonal SD of 21.5 mm. Table 20 provides surface types, and Table 21 provides aspherical coefficients. Table 20 Table 21 Table 21 (continued)

[0079] The power order from lens element L1 to lens element L7 is as follows: +--+-+- (positive, negative, negative, positive, negative, positive, negative). PG1 and P6 are similar, meaning the difference between PG1 / 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 power Pi, the ratio between each Pi and PG1, and the refractive index of the lens elements. Table 22

[0080] Figure 11 shows another example of the 2G pop-up optical lens system disclosed herein and designated 1100. Lens system 1100 includes a pop-up lens 1102 divided into G1 and G2, an image sensor 1104, and optionally, an optical element 1106. The image sensor 1104 may have a sensor diagonal SD of 21.5 mm. Table 23 provides surface types, and Table 24 provides aspherical coefficients. Table 23 Table 24 Table 24 (continued)

[0081] The power order from lens element L1 to lens element L7 is as follows: +-++-+- (positive, negative, positive, positive, negative, positive, negative). PG1 and P1, as well as PG1 and P7, are similar, meaning the difference between PG1 / P1 and PG1 / 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 power Pi, the ratio between each Pi and PG1, and the refractive index of the lens elements. Table 25

[0082] Figure 12 shows another example of the 2G pop-up optical lens system disclosed herein and designated 1200. The lens system 1200 includes a pop-up lens 1202 divided into G1 and G2, an image sensor 1204, and optionally, an optical element 1206. The image sensor 1204 may have a sensor diagonal SD of 21.5 mm. Table 26 provides surface types, and Table 27 provides aspherical coefficients. Table 26 Table 27 Table 27 (continued)

[0083] The power order from light-transmitting element L1 to light-transmitting element L7 is as follows: +-+--+- (positive, negative, positive, negative, negative, positive, negative). PG1 and P1, PG1 and P5, and PG1 and P7 are similar, meaning the difference between PG1 / P1, PG1 / P5, and PG1 / P7 and 1 does not exceed 20%. Specifically, Table 28 shows the power Pi and the ratio between each Pi and PG1. Table 28

[0084] Figure 13 shows another example of the 2G pop-up optical lens system disclosed herein and designated 1300. Lens system 1300 includes a pop-up lens 1302 divided into G1 and G2, an image sensor 1304, and optionally, an optical element 1306. The image sensor 1304 may have a sensor diagonal SD of 21.5 mm. Table 29 provides surface types, and Table 30 provides aspherical coefficients. Table 29 Table 30

[0085] The order of focal length from light-transmitting element L1 to light-transmitting element L7 is as follows: +-+--+- (positive, negative, positive, negative, negative, positive, negative). PG1 and P6, as well as PG1 and P7, are similar, meaning the difference between PG1 / P6 and PG1 / P7 and 1 does not exceed 20%. Specifically, Table 31 shows the focal length Pi and the ratio between each Pi and PG1. Table 31

[0086] Figure 14 shows another example of the 2G pop-up optical lens system disclosed herein and designated 1400. Lens system 1400 includes a pop-up lens 1402 divided into G1 and G2, an image sensor 1404, and optionally, an optical element 1406. The image sensor 1404 may have a sensor diagonal SD of 21.5 mm. The first lens group G1 includes six lens elements, and the second lens group G2 includes two lens elements. Table 32 provides surface types, and Table 33 provides aspherical coefficients. Table 32 Table 33 Table 33 (continued)

[0087] The order of focal length from lens element L1 to lens element L8 is as follows: ++-+-++- (positive, positive, negative, positive, negative, positive, positive, negative). PG1 and P6, as well as PG1 and P8, are similar; that is, the difference between PG1 / P6 and PG1 / P8 and 1 does not exceed 20%. Specifically, Table 34 shows the focal length Pi and the ratio between each Pi and PG1. Table 34 Table 35

[0088] Figure 15 shows another example of the 2G pop-up optical lens system disclosed herein and designated 1500. The lens system 1500 includes a pop-up lens 1502 divided into G1 and G2, an image sensor 1504, and optionally, an optical element 1506. The image sensor 1504 may have a sensor diagonal SD of 21.5 mm. The first lens group G1 includes six lens elements, and the second lens group G2 includes one lens element. Table 35 provides surface types, and Table 36 provides aspherical coefficients. Table 36 Table 36 (continued)

[0089] The power order of the lenses from light-transmitting element L1 to light-transmitting element 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 measured from the optical axis (OA) on the rear surface. PG1 and P3, PG1 and P6, and PG1 and P8 are similar, meaning that the difference between PG1 / P3, PG1 / P6, and PG1 / P8 and 1 does not exceed 10%. Specifically, Table 37 shows the power Pi and the ratio between each Pi and PG1. Table 37

[0090] Figure 16 shows an example of the 1G pop-up optical lens system disclosed herein and designated 1600. The lens system 1600 includes a pop-up lens 1602, an image sensor 1604, and optionally, an optical element 1606. The image sensor 1604 may have a sensor diagonal SD of 16.0 mm. Table 38 provides surface types, and Table 39 provides aspherical coefficients. Table 38 Table 39 Table 39 (continued)

[0091] The thickness profile (measured along the z-axis) of the light-transmitting element L5, taken along the y-axis and starting from the optical axis (OA) of lens 1602, has a local minimum and a local maximum at the optical axis, wherein the local minimum is not located at the edge (or boundary) of lens element L5, i.e., the local minimum is located at a distance less than DA / 2 from the optical axis. Similarly, the thickness profile of lens element L6, obtained in the manner described above, has a local maximum and a local minimum at the optical axis, wherein the local maximum is not located at the edge of lens element L6. This characteristic of lens elements L5 and L6 is beneficial for achieving a lens with low field curvature. The focal power order of lens elements L1 to L6 is positive, negative, positive, positive, positive, negative. Lens element L2 is a strongly negative lens, and its size |f2| satisfies |f2| / EFL < 1.5.

[0092] Figure 17 shows another example of the 1G pop-up optical lens system disclosed herein and numbered 1700. Lens system 1700 includes a pop-up lens 1702, an image sensor 1704, and optionally, an optical element 1706. The image sensor 1704 may have a sensor diagonal (SD) of 16.0 mm. Table 40 provides surface types, and Table 41 provides aspherical coefficients. The focal power order of lens elements L1 to L7 is negative, positive, positive, negative, negative, positive, negative. Lens element L6 has a deflection point that is not at the optical axis, which is beneficial for achieving a lens with low field curvature. Table 40 Table 41 Table 41 (continued)

[0093] Transmitting elements L1 and L2, and transmitting elements L3 and L4, are at consistent distances from each other. For all values ​​along the y-axis between the optical axis (OA) and DA / 2, the average values ​​of the distances between L1 and L2 (“μL1-L2”) and between L3 and L4 (“μL3-L4”) measured along the z-axis are μdL1-L2 = 0.06 mm and μdL3-L4 = 0.39 mm, respectively, with standard deviations of σdL1-L2 = 0.02 mm and σdL3-L4 = 0.07 mm. For L1, L2 and L3, L4, the ratios of σ and μ are σdL1-L2 / μL1-L2 = 0.36 and σdL3-L4 / μL3-L4 = 0.17, respectively. The distances at the optical axis between L1 and L2 (“dL1-L2”) and L3 and L4 (“dL3-L4”) and TLens are dL1-L2 / TLens = 1.03% and dL3-L4 / TLens = 5.2%, respectively. L1 and L2 are very close to each other, similar to a doublet lens.

[0094] Figure 18 shows another example of the 1G pop-up optical lens system disclosed herein and designated 1800. Lens system 1800 includes a pop-up lens 1802, an image sensor 1804, and optionally, an optical element 1806. The image sensor 1804 may have a sensor diagonal SD of 16.0 mm. Table 42 provides surface types, and Table 43 provides aspherical coefficients.

[0095] The focal power sequence of lens elements L1 to L8 is negative, negative, positive, negative, negative, positive, positive, negative. The deflection point of lens element L7 is not at the optical axis, which is beneficial for achieving a lens with low field curvature. The thickness profile of lens element L6, taken along the y-axis and starting from OA of lens 1802, has a local minimum, and at the optical axis, it has both a local maximum and a local minimum, where the local minimum is not located at the edge of lens element L6. This is beneficial for achieving low field curvature. All surfaces of lens elements L1 to L5 are convex. The sign sequence of fi for lens elements L1 to L8 is negative, negative, positive, negative, negative, positive, positive, negative.

[0096] L1 and L2, L2 and L3, and L3 and L4 have consistent distances from each other. For all values ​​along the optical axis (OA) DA / 2 along the y-axis, the mean distances are μdL1-L2 = 0.10 mm, μdL2-L3 = 0.17 mm, and μdL3-L4 = 0.15 mm, with standard deviations of σdL1-L2 = 0.09 mm, σdL2-L3 = 0.07 mm, and σdL3-L4 = 0.02 mm. For L1, L2, L2, L3, and L3, L4, the ratios of the standard deviations to the mean distances are σdL1-L2 / μL1-L2 = 0.88, σdL2-L3 / μL2-L3 = 0.43, and σdL3-L4 / μL3-L4 = 0.02, respectively. The optical axis distances dL1-L2=0.07 mm, dL2-L3=0.12 mm, and dL3-L4=0.12 mm have ratios to TLens of dL1-L2 / TLens=0.93%, dL2-L3 / TLens=1.56%, and dL3-L4 / TLens=1.47%, respectively. Table 42 Table 43 Table 43 (continued)

[0097] Although this disclosure has been described with reference to certain examples and generally associated methods, variations and arrangements of the examples and methods will be apparent to those skilled in the art. This disclosure should be understood not to be limited to the specific examples described herein, but only to the scope of the appended claims.

[0098] It should be understood that, for clarity, certain features of the currently disclosed subject matter described in the context of a single example may also be provided in combination within that single example. Conversely, for brevity, various features of the currently disclosed subject matter described in the context of a single example may also be provided individually or in any suitable sub-combination.

[0099] Furthermore, for clarity, the term "substantially" is used herein to imply the possibility that a value may vary 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.

[0100] Unless otherwise stated, the phrase "and / or" is used between the last two members of the options list to indicate that selecting one or more of the listed options is appropriate and permissible.

[0101] It should be understood that when the patent application or specification refers to an element as “a” or “an”, such reference should not be interpreted as meaning that there is only one of that element.

[0102] All patents and patent applications mentioned in this specification are incorporated herein by reference in their entirety, as if each individual patent or patent application were specifically and individually indicated to be incorporated herein by reference. Furthermore, any reference or designation in this application should not be construed as an admission that such reference is prior art as disclosed herein.

[0103] 200: Lens System 202: Pop-up Camera 204: Image Sensor 250: Lens System 252: Pop-up camera 254: Image Sensor 400: Lens System 402: Pop-up camera 404: Image Sensor 406: Optical Components 500: Lens System 502: Pop-up Lens 504: Image Sensor 506: Optical Components 600: Lens System 602: Pop-up Lens 604: Image Sensor 606: Optical Components 700: Lens System 702: Pop-up Lens 704: Image Sensor 706: Optical Components 800: Lens System 802: Pop-up Lens 804: Image Sensor 806: Optical Components 900: Lens System 902: Pop-up Lens 904: Image Sensor 906: Optical Components 1000: Lens System 1002: Pop-up Lens 1004: Image Sensor 1006: Optical Components 1100: Lens System 1102: Pop-up camera 1104: Image Sensor 1106: Optical Components 1200: Lens System 1202: Pop-up camera 1204: Image Sensor 1206: Optical Components 1300: Lens System 1302: Pop-up Lens 1304: Image Sensor 1306: Optical Components 1400: Lens System 1402: Pop-up Lens 1404: Image Sensor 1406: Optical Components 1500: Lens System 1502: Pop-up Lens 1504: Image Sensor 1506: Optical Components 1600: Lens System 1602: Pop-up Lens 1604: Image Sensor 1606: Optical Components 1700: Lens System 1702: Pop-up Lens 1704: Image Sensor 1706: Optical Components 1800: Lens System 1802: Pop-up Lens 1804: Image Sensor 1806: Optical Components BFL: Back focal length BG: Large gap c-BFL: Folded back focal length c-BG: Large gaps in the folding c-TTL: Total length of folding track EFL: Effective Focal Length FOV: Field of View G1: First lens group G2: Second lens group L1: Lens element L2: Lens element L3: Lens element L4: Lens element L5: Lens element L6: Lens element L7: Lens element L8: Lens element S1: Surface S2: Surface S3: Surface S4: Surface S5: Surface S6: Surface S7: Surface S8: Surface S9: Surface S10: Surface S11: Surface S12: Surface S13: Surface S14: Surface S15: Surface S16: Surface S17: Surface S18: Surface S19: Surface S20: Surface TG1: Thickness TLens: Thickness TTL: Total track length Y: axis Z: Axis ΔfG1-G2: Focused Stroke ΔfLens: Focused Journey

Claims

1. A lens system for a small digital camera, comprising: An image sensor having a sensor diagonal (SD); and a lens having a field of view (FOV) greater than 60 degrees, a back focal length (BFL), an effective focal length (EFL), and a plurality of lens elements (L1) to (LN), the plurality of lens elements (L1) to (LN) being arranged from an object side to an image side along a lens optical axis (OA) starting from the lens element (L1), N being greater than or equal to 6, the lens having a total ejection track length (TTL) in an ejected state, and in a folded state... The system has a total folding track length (c-TTL) in the pop-up state, wherein the lens system is configured to switch from the pop-up state to the folded state by folding the back focal length (BFL) to a folded back focal length (c-BFL), wherein the sensor diagonal (SD) is greater than or equal to 12 mm, wherein the back focal length (BFL) is greater than 0.15 times the pop-up total track length (TTL), and wherein a ratio of the folded total track length (c-TTL) to the sensor diagonal (SD) is less than 0.

65.

2. The lens system as described in claim 1, wherein N equals 7.

3. The lens system as described in claim 1, wherein N equals 6 or N equals 8.

4. The lens system as claimed in claim 1, wherein the ratio of the total folding track length (c-TTL) to the sensor diagonal (SD) is between 0.50 and 0.

65.

5. The lens system as claimed in claim 1, wherein the sensor diagonal (SD) is between 14 mm and 22 mm.

6. The lens system as claimed in claim 1, wherein the ratio of the total track length (TTL) to the sensor diagonal (SD) is between 0.59 and 0.

65.

7. The lens system as claimed in claim 1, wherein the folded back focal length (c-BFL) is between 1.0 mm and 2.5 mm.

8. The lens system as claimed in claim 1, wherein the ratio of the back focal length (BFL) to the total telephoto track length (TTL) is between 0.17 and 0.

28.

9. The lens system as claimed in claim 1, wherein a ratio of a maximum folded back focal length (c-BFLMAX) to the total telescopic length (TTL) of the pop-up is between 0.13 and 0.

24.

10. The lens system as described in claim 1, wherein the lens system has an f number less than 2.

11. The lens system as claimed in claim 1, wherein the total track length (TTL) of the pop-out is between 9.37 mm and 10.45 mm.

12. The lens system as claimed in claim 1, wherein the sensor diagonal (SD) is 16 mm.

13. The lens system as claimed in claim 1, wherein the lens has a lens thickness (TLens) measured at the lens optical axis (OA) and an air gap (dL1-L2) measured at the lens optical axis (OA) and between the lens element (L1) and the lens element (L2), and wherein a ratio of the air gap (dL1-L2) to the lens thickness (TLens) is between 0.24% and 1.11%.

14. The lens system as claimed in claim 1, wherein the lens has a lens thickness (TLens) between 7.18 mm and 8.42 mm.

15. The lens system as claimed in claim 1, wherein the strongest lens element of the lens has a focal length (fLS), and wherein a ratio of the focal length (fLS) to the effective focal length (EFL) is between 0.68 and 0.

80.

16. The lens system as claimed in claim 1, wherein the strongest lens element of the lens has a focal length (fLS) between 5.99 mm and 7.03 mm.

17. The lens system as claimed in claim 1, wherein a penultimate lens element of the lens has a focal length (fN-1), and wherein a ratio of the focal length (fN-1) to the effective focal length (EFL) is between 0.79 and 1.

51.

18. The lens system as claimed in claim 1, wherein a penultimate lens element of the lens has a focal length (fN-1) between 7.45 mm and 13.20 mm.

19. The lens system as claimed in claim 1, wherein the lens system has an f-number between 1.68 and 1.

86.

20. The lens system as claimed in claim 1, wherein the back focal length (BFL) is between 1.62 mm and 2.81 mm.

21. The lens system as claimed in claim 1, wherein a ratio of a maximum folded back focal length (c-BFLMAX) to the back focal length (BFL) is between 0.75 and 0.

86.

22. The lens system as claimed in claim 1, wherein a ratio of the total telescopic length (TTL) to the effective focal length (EFL) is between 1.07 and 1.

19.

23. The lens system as claimed in claim 1, wherein the lens system is included in a mobile device.

24. The lens system as described in claim 23, wherein the mobile device is a smartphone.

Images