Slim pop-out wide camera lens

Abstract

To provide a wide camera that supports high image quality (IQ), and for example, still adapts to a thin type mobile instrument of a device height less than 10 mm.SOLUTION: A pop-out lens system is for a compact digital camera, and comprises: an image sensor that has a sensor diagonal line; and a lens that has a field of view FOV greater than 60 deg, and has lens elements L1 to Li of N≥7 arranged along a lens optical axis to begin with the lens element L1 from an object side toward an image side. Each lens element Li has each focal length fi. The lens element is separated into two lens groups G1 and G2 by a large gap BG, and the lens has a pop-out total track length TTL less than 20 millimeter in a pop-out state, and has a collapsed total track length in a collapsed state. The lens system is configured to collapse the BG to thereby switch to the collapsed state from the pop-out state and vice versa, and satisfy a given condition.SELECTED DRAWING: Figure 4

Description

Detailed Description of the Invention

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims the benefit of priority from U.S. Provisional Patent Application No. 63 / 141,128, filed January 25, 2021, which is incorporated herein by reference in its entirety.

[0002] (Technical field) The present disclosure relates generally to digital cameras, and more particularly to digital cameras with pop-out mechanisms and lenses.

[0003] (definition) In this application, and for optical and other properties referred to throughout the specification and description, the following symbols and abbreviations are used for all terms known in the art.

[0004] Total Track Length (TTL): The maximum distance, measured along an axis parallel to the optical axis of the lens, between a point on the front surface S1 of the first lens element L1 and the image sensor when the system is focused at an object distance of infinity.

[0005] Back Focal Length (BFL): The smallest distance, measured along an axis parallel to the optical axis of the lens, between a point on the back surface S2N of the last lens element LN and the image sensor when the system is focused to an infinite object distance.

[0006] Effective focal length (EFL): The distance between the rear principal point P' and the rear focal point F' of a lens (the collection of lens elements L1 to LN).

[0007] F-number (f / #): The ratio of the EFL to the entrance pupil diameter.

[0008] (Background technology) Multi-aperture digital cameras (or multi-cameras) are common in current mobile handheld electronic devices (or "mobile devices" for short, for implementing smartphones, tablets, etc.). They generally have a wide camera field of view (FOV) of 70-90 degrees. W ) serves as the main (or "primary") camera of the mobile device.

[0009] A key challenge is designing wide cameras that support ever higher image quality (IQ) and still fit into thin mobile devices, e.g., with device heights of less than 10 mm. One promising path to improving the IQ of wide cameras is the incorporation of larger image sensors.

[0010] Figure 1A shows a schematic definition of various camera entities such as TTL, EFL, BFL, etc. In most small lenses used in multi-cameras integrated into mobile devices, TTL is larger than EFL, as shown in Figure 1A for example for wide lenses.

[0011] FIG. 1B shows an exemplary camera with a field of view (FOV), EFL, and an image sensor with a sensor width S. For a fixed width / height ratio and (rectangular) image sensor, the sensor diagonal (SD) is proportional to the sensor width and height. For example, a 1 / 1.2 inch sensor has a standard deviation of 14.3 mm. The horizontal FOV is related to the EFL and the sensor width S as follows:

[0012]

number

[0013] This shows that a larger EFL is required to realize a camera with a larger image sensor, but with a similar FOV. Incorporating a larger image sensor into a wide camera is desirable to improve the IQ of the wide camera, but to maintain the same (wide camera) FOV, a larger EFL is required, resulting in a larger TTL. This is undesirable as it hinders the integration of wide cameras in mobile devices.

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

[0015] It would be beneficial to have a wide camera lens design that supports pop-out wide cameras with large image sensors such as 1 / 1.2 inches or larger, i.e., SD≧14.3 mm.

[0016] (Summary of the Invention) In various embodiments, a lens system for a compact digital camera is provided, the lens system comprising: an image sensor having a sensor diagonal SD; and a lens having a field of view FOV>60 deg and including, from an object side to an image side, N≧6 lens elements L1 to LN, starting with L1, each of which has a power |f i Each focal length f with | ithe lens element is divided into two lens groups G1 and G2 separated by a large gap (BG), the lenses having a popped-out total track length TTL<20 mm in the popped-out state and a collapsed total track length (c-TTL) in the collapsed state, the lens system being configured to switch from the popped-out state to the collapsed state (and vice versa) by collapsing BG, where BG>0.25×TTL, where SD≧12 mm, and the ratio c-TTL / SD<0.7.

[0017] In some embodiments, G1 may include five or more lens elements and G2 may include one or two lens elements.

[0018] In some embodiments, the ratio c-TTL / TTL<0.7. In some embodiments, the ratio c-TTL / TTL<0.65.

[0019] In some embodiments, BG > 0.3 x TTL. In some embodiments, BG > 0.35 x TTL.

[0020] In one embodiment, the thickness T G1 is 0.35xTTL <T G1 Meet <0.47xTTL.

[0021] In some embodiments, the power P of G1 G1 HA P G1 >0 and G2's power P G2 HA P G2 <0. In some embodiments, -1.81≦P G1 / P G2 ≦-0.9.

[0022] In one embodiment, i=6 and the arrangement of lens powers P1-P6 of lens elements L1-L6 is plus, minus, plus, minus, plus, minus.

[0023] In one embodiment, the array of lens powers P1 to P7 of i = 7 and lens elements L1 to L7 may be plus, minus, minus, plus, minus, plus, minus, or plus, minus, plus, minus, minus, plus, minus, or plus, plus, minus, plus, minus, plus, minus, or plus, minus, plus, plus, minus, plus, minus.

[0024] In one embodiment, the array of lens powers P1 to P8 of i = 8 and lens elements L1 to L8 can be plus, plus, minus, plus, minus, plus, plus, minus, or plus, minus, minus, plus, minus, plus, plus, minus.

[0025] In some embodiments, the last two lens elements of G1 may have an Abbe number of 50 < V < 120 and an effective focal length of 13 mm < EFL < 50 mm.

[0026] In one embodiment, the magnitude of the focal length |f1| of L1 and the magnitude of the focal length |f6| of L6 may vary by less than 25% and both may be less than 45% of each of the focal lengths of |f1| and |f6|. |f2|, |f3|, |f4|, and |f5| are L2, L3, L4, and L5, respectively.

[0027] In some embodiments, L1, L2, L3, and L4 have a meniscus shape with respect to the object side, and L5 and L6 have a meniscus shape with respect to the image side.

[0028] In one embodiment, the magnitude of the focal length |f4| of L4 can vary by more than 50% of each of the magnitudes of the focal lengths |f1|, |f2|, |f3|, |f5|, |f6| of L1, L2, L3, L5, and L6.

[0029] In one embodiment, the magnitude of the focal length |f6| of L6 may vary by more than 100% of each of the magnitudes of the focal lengths |f1|, |f2|, |f3|, |f4|, |f5|.

[0030] In some embodiments, P G1 / P3 does not vary by more than 10% from 1. In some embodiments, P G1 / P6 does not vary by more than 10% from 1. In some embodiments, P G1 / P3 and P G1 / P6 does not vary by more than 20% from 1. In some embodiments, P G1 / P6 and P G1 / P7 does not vary by more than 20% from 1. In some embodiments, P G1 / P1 does not vary by more than 20% from 1. In some embodiments, P G1 / P1, P G1 / P5 and P G1 / P7 does not vary by more than 20% from 1. In some embodiments, P G1 / P6 and P G1 / P8 does not vary by more than 20% from 1. In some embodiments, P G1 / P3, P G1 / P6 and P G1 / P8 may not vary by more than 1 to 10%.

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

[0032] In some embodiments, L4 is made of glass and has a power n>1.7.

[0033] In some embodiments, L2, L4, and L6 are made of glass, each having a refractive index n>1.7.

[0034] In some embodiments, L4 and L6 are made of glass, each having a refractive index n>1.7.

[0035] In some embodiments, the flexure point on the anterior surface of L1 is located at a distance d-f measured from the optical axis of the lens, where 1.5 mm <d―f<3.5mmである。

[0036] In some embodiments, the flexure point on the posterior surface of L1 is located at a distance d-r measured from the optical axis of the lens, where 1.5 mm <d―r<3.5mmである。

[0037] In some embodiments, a lens system such as those described above or below may be included in a pop-out camera having a sensor with a sensor diagonal SD of 10-30 mm.

[0038] In some embodiments, a pop-out camera having a sensor with a sensor diagonal SD between 14 and 22 mm can include a lens system such as those described above or below.

[0039] In addition, there is also an embodiment in which a lens system such as the one described above or described below is mounted on a pop-out camera mounted on a smartphone.

[0040] In various embodiments, a lens system for a compact digital camera is provided, which includes an image sensor having a sensor diagonal SD, an F-number (f / #), and a lens thickness ("T Lens "), a back focal length (BFL), and an effective focal length (EFL), and from the object side to the image side, there are N≧6 lens elements L1 to LN starting from L1, and the intensity |f i Each focal length f with | i and a lens having a field of view FOV>60 deg, with each lens element Li having a field of view FOV>60 deg, wherein the lens system is configured to switch from a popped-out state to a folded state by folding the BFL to a folded BFL (and vice versa), where SD≧12 mm, BFL>0.15×TTL, and ratio c−TTL / SD<0.65.

[0041] BRIEF DESCRIPTION OF THE DRAWINGS Non-limiting examples of the embodiments disclosed herein are described below in connection with the drawings attached hereto, listed after this paragraph. Identical structures, elements, or parts that appear in more than one figure are generally labeled with the same numeral in all figures in which they appear. If identical elements are shown but numbered in only one figure, they are assumed to have the same numeral in all figures in which they appear. The drawings and description are meant to clarify the embodiments disclosed herein and should not be considered limiting in any way.

[0042] In the drawings: FIG. 1A shows a schematic definition of various entities such as TTL and EFL.

[0043] FIG. 1B shows the definitions of FOV, EFL, and S for a thin lens approximation or equivalent.

[0044] FIG. 2A is a diagram illustrating a schematic of the pop-out optical lens system disclosed herein in a pop-out state focused at infinity.

[0045] FIG. 2B is a schematic diagram of the pop-out system of FIG. 2A in a folded state.

[0046] FIG. 2C illustrates a schematic diagram of another pop-out optical lens system disclosed herein in a pop-out state.

[0047] FIG. 2D is a schematic diagram of the pop-out system of FIG. 2C in a collapsed state.

[0048] FIG. 3A shows the pop-out system of FIG. 2A focused at a closer distance (eg, 50 cm) using the first method of focusing.

[0049] FIG. 3B shows the pop-out system of FIG. 2A focused at a closer distance (eg, 50 cm) using a second focusing technique.

[0050] FIG. 4 illustrates one embodiment of the pop-out optical lens system disclosed herein.

[0051] FIG. 5 illustrates another embodiment of the pop-out optical lens system disclosed herein.

[0052] FIG. 6 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0053] FIG. 7 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0054] FIG. 8 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0055] FIG. 9 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0056] FIG. 10 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0057] FIG. 11 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0058] FIG. 12 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0059] FIG. 13 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0060] FIG. 14 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

[0061] 15, 16, 17 and 18 show yet another embodiment of the pop-out optical lens system disclosed herein.

[0062] Detailed Description FIG. 2A illustrates one embodiment of a "two-group" (or "2G") pop-out optical lens system 200 comprising a pop-out lens 202 and an image sensor 204 as disclosed herein. The pop-out optical lens system 200 is shown in a pop-out or extended state (i.e., focused at infinity). The pop-out lens 202 is divided into two lens groups separated by a large gap (BG), a first object-side lens group ("G1"), and a second sensor-side lens group ("G2"). The thickness of G1 is T G1 The lens 202 includes a plurality of N lens elements L1 (where "i" is an integer between 1 and N, and N may be between 5 and 9 in some embodiments). 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 L1 has a respective front surface S2i-1 (where the index "2i-1" is the number of the front surface) and a respective back surface S2i (where the index "2i" is the number of the back surface). This numbering convention is used throughout the description. Alternatively, as will be done throughout this description, lens surfaces are marked as "Sk," where k ranges from 1 to 2N. The front and back surfaces may be aspherical in some cases. However, this is not limiting.

[0063] As used herein, the term "front surface" of each lens element refers to the surface of the lens element that is closer to the entrance of the camera (the object side of the camera), and the term "rear surface" refers to the surface of the lens element that is closer to the image sensor (the image side of the camera).

[0064] Each lens group includes one or more lens elements Li. G1 can include ≧5 elements, and G2 can include 1-2 elements. G2 can act as a field lens, as known in the art.

[0065] FIG. 2B shows the 2G pop-out optical lens system 200 in a folded state. The big gap BG collapses into a collapsed BG (marked "c-BG"). That is, the distance between G1 and G2 decreases, resulting in a collapsed TTL ("c-TTL"). The c-BG may range from 0.2 mm to 5 mm. Only the BG changes. Other distances in the pop-out optical lens system 200, such as the distance between the lens elements included in G1 and G2, remain unchanged.

[0066] Figure 2C shows the thickness T Lens FIG. 2D shows an embodiment of a "one group" (or "1G") pop-out optical lens system 250 comprising a pop-out lens 252 having a lens group 252a and an image sensor 254 as disclosed herein. The pop-out optical lens system 250 is shown in a pop-out state. The pop-out lens 252 is not split into two lens groups. FIG. 2D shows the 1G pop-out optical lens system 250 in a collapsed state. The BFL is collapsed to a collapsed BFL (marked "c-BFL"), i.e., the distance between the lens 252 and the image sensor 254 is reduced, resulting in a c-TTL. The c-BFL may range from 0 to 3 mm. Only the BFL is changed. Other distances in the pop-out optical lens system 250, such as the distance between the lens elements of the lens 252, are not changed.

[0067] The 2G pop-out optical lens system 200 and the 1G pop-out optical lens system 250 can be included in a pop-out camera. To perform optical image stabilization (OIS), the pop-out camera can use several methods known in the art. Such methods may be "lens-shift OIS," in which the lens is moved relative to the image sensor and camera host mobile device for OIS, or "sensor-shift OIS," in which the image sensor is moved relative to the lens and camera host mobile device for OIS.

[0068] All pop-out optical lens systems disclosed herein can be used in the pop-out camera embodiments described in commonly owned PCT patent application PCT / IB2020 / 058697.

[0069] 2A shows the 2G pop-out optical lens system 200 focused at infinity, and FIG. 3A shows the 2G pop-out optical lens system 200 focused at a closer object, following a first focusing method called "G1-G2 focusing" for the embodiment focused at 1 m. In the G1-G2 focus, G1 and G2 are spaced apart from each other by a thickness designated by BG. Focus The focus stroke "Delf" is G1-G2 =T Focus -BG". BFL does not change, but BG changes. BG and T Focus The values ​​of are shown in Table 1 for all 2G lens systems disclosed herein. #BG indicates the surface that changes due to G1-G2 focusing.

[0070] 3B shows the 2G pop-out optical lens system 200 focused on a closer object for an example focused at 1 m according to a second focusing method called "lens focusing." Due to lens focusing, G1 and G2 are focused on a closer object relative to the image sensor by Δf Lens The two lenses move together as one. The background doesn't change, but the background-front changes. Lens focusing is the standard method used in state-of-the-art digital cameras in mobile electronics.

[0071] All 2G pop-out optical lens systems disclosed below can be focused by G1-G2 focusing as well as lens focusing. All 1G pop-out optical lens systems disclosed below are focused by lens focusing.

[0072] All pop-out optical lens systems disclosed below are shown in a pop-out state in which the pop-out camera containing the optical lens system is in operation.

[0073] In the collapsed state, all 2G pop-out optical lens system embodiments have a c-BG between 0.2 mm and 4.4 mm. In the folded state, all 1G pop-out optical lens system embodiments have a c-BFL between 1.0 mm and 2.5 mm. A small c-BG and c-BFL are each beneficial for achieving a slim camera module that can be integrated into a slim mobile device such as a smartphone. For clarity, all lens systems disclosed herein may be beneficially included or incorporated into a smartphone.

[0074] Table 1 shows the values ​​and ranges included in the lens system embodiments 400-1800 disclosed below (SD, TTL, c-TTL, BG, c-BG, EFL, TG1, T Focus d L1-L2 , T Lens , f LS , f N-1 is given in mm, half field of view ("HFOV") and 35mm equivalent focal length ("35mmEqFL") are given in degrees, Abbe number v, #L S and F-stops ("f / #") are given without units, and power is given in inverse meters [1 / m]). c-TTL MIN and c-TTL MAX refer to the minimum and maximum c-TTL that can be achieved in each embodiment, respectively. In general, in Table 1, "MIN" and "MAX" refer to the minimum and maximum values ​​in the range, respectively.

[0075] "#L S " represents the number of the strongest lens element in the lens, i.e., the lens element with the smallest positive focal length f. "f LS " represents the f of the strongest lens element in the lens. "f N-1 " is the N-1 in the lens th represents the f of the (i.e., penultimate) lens element. d L1-L2represents the distance (or air gap) between L1 and L2.

[0076] In the 2G lens system, L M refers to the last lens element of the G1. M-1 +L M " refers to the properties of the last two lens elements of G1 together. In embodiment 400, L M-1 +L M refers to the properties of L5 and L6 together, and in the embodiment 1500 refers to the properties of L6 and L7 together. To perform G1-G2 focusing, BG represents the thickness of the surface "#BG" when focused to infinity. "T Focus " represents the thickness of the surface "#BG" when focused to 1m and 0.5m, respectively. The power of the entire G1 group is P G1 and the power of the entire G2 group is P G2 and the powers of the individual lens elements are marked with the element number, i.e., the powers of L1 are marked as P1, the powers of L2 are marked as P2, and T G1 indicates the thickness of G1.

[0077] [Table 1-1]

[0078] [Table 1-2]

[0079] In all 2G lens system embodiments 400-1500 disclosed below, the ratio of TTL to EFL is in the range of TTL / EFL=1.13~1.3, the ratio of TTL to SD is in the range of TTL / SD=0.64~0.78, and the ratio of c-TTL to SD is in the range of c-TTL / SD=0.41~0.73.

[0080] In all 1G lens system embodiments 1600-1800 disclosed below, the ratio of TTL to EFL is in the range of TTL / EFL=1.05-1.3, the ratio of TTL to SD is in the range of TTL / SD=0.59-0.65, and the ratio of c-TTL to SD is in the range of c-TTL / SD=0.50-0.65.

[0081] FIG. 4 illustrates one embodiment of a 2G pop-out optical lens system, designated 400, disclosed herein. Lens system 400 includes a pop-out lens 402 divided into two lens groups, G1 and G2, an image sensor 404, and, optionally, an optical element 406. Optical element 406 may be, for example, an infrared filter and / or a glass image sensor dust cover. Image sensor 404 may have an SD of 14.3 mm. G1 includes six lens elements, and G2 includes one lens element. Light rays pass through lens 402 and form an image on image sensor 404. FIG. 4 illustrates three illumination fields, each with three rays: an upper marginal ray, a lower marginal ray, and a chief ray. All subsequent figures also illustrate these three rays.

[0082] Detailed optical and surface data of the pop-out lens 402 are shown in Tables 2 and 3. Table 2 shows the surface types, and Table 3 shows the aspheric coefficients. The surface types are: a) Plano: Flat surface, no curvature.

[0083] b) Q Type 1 (QT1) Surface Sagging Type:

[0084]

number

[0085] c) Aspheric (ASP) surface sag formula:

[0086]

number

[0087] where {z, r} are the reference cylindrical polar coordinates, c is the paraxial curvature of the surface, k is the conic parameter, and r norm is generally half the transparent aperture (CA) of the surface, and A n are the aspheric coefficients given in the lens data table. The Z axis is positive towards the image side. Values ​​for CA are given as the clear aperture radius, i.e., D / 2. The reference wavelength is 555.0 nm. Units are in mm except for the refractive index ("refractive index") and Abbe #. Each lens element Li has a respective focal length fi given in Table 2. The FOV is given as half FOV (HFOV). The definitions of surface type, Z axis, CA value, reference wavelength, units, focal length, and HFOV are valid for all tables below.

[0088] [Table 2]

[0089] [Table 3-1]

[0090] [Table 3-2]

[0091] The deflection point of L1 is located at a distance of 1.884 mm measured from the rear optical axis ("OA"). The magnitudes of the focal lengths of L1 (|f1|) and L6 (|f6|) are similar; that is, their magnitudes can differ by <30%. The magnitudes |f1| and |f6| are much smaller than the magnitudes of all the focal lengths of the single lens elements L2, L3, L4, and L5; that is, |f1|,|f6|<<|f2|,|f3|,|f4|,|f5|. For example, |f2|,|f3|,|f4|,|f5| can be more than 45% larger than |f1|,|f6|. L1(P1) and P G1The ratio of the powers is P1 / P G1 = 0.89. Specifically, Table 4 shows the ratios of |fi / f1| and |fi / f6|, and their respective P i and P G1 The ratio is shown.

[0092] [Table 4]

[0093] 5 shows another embodiment of a 2G pop-out optical lens system disclosed herein and designated 500. Lens system 500 includes a pop-out lens 502 divided into two lens groups G1 and G2, an image sensor 504, and optionally, an optical element 506. Image sensor 504 may have an SD of 14.3 mm (a "1 / 1.2" sensor). Table 5 lists the surface types and Table 6 lists the aspheric coefficients.

[0094] [Table 5]

[0095] [Table 6-1]

[0096] [Table 6-2]

[0097] The power arrangement of the lens elements L1 to L7 is +--+-+- (plus, minus, minus, plus, minus, plus, minus). Specifically, the lens power P of the lens elements L1 to L7 is iare shown in Table 7. L1, L2, and L4 form meniscuses facing the object side. L5 and L6 each form meniscuses facing the image side. |f4| is much smaller than |f| of all focal lengths of the single lens elements L1, L2, and L3. That is, |f4|<<|f1|, |f2|, |f3|. For example, |f1|, |f2|, |f3| can be greater than |f4| by more than 50%. L4 is made of glass with a refractive index n>1.7. P G1 and P3 are similar. That is, P G1 / P3 does not vary by more than 10% from 1. Specifically, in Table 7, power P i , the ratio of |f / f4|, and each P i and P G1 The ratio is shown.

[0098] [Table 7]

[0099] 6 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 600. Lens system 600 includes a G1 and G2 split pop-out lens 602, an image sensor 604, and optionally, an optical element 606. Image sensor 604 may have an SD of 21.5 mm (a "1 / 0.8" sensor). Table 8 lists the surface types and Table 9 lists the aspheric coefficients.

[0100] [Table 8]

[0101] [Table 9-1]

[0102] [Table 9-2]

[0103] The power arrangement of the lens elements L1 through L7 is +-+--+ (plus, minus, plus, minus, minus, plus). L5 and L6 (the last two lens elements of G1) are both Abbe-# L5+L6 =71.87 and EFL L5+L6 = 17.51 ​​mm. |f6| is much smaller than the magnitude of all focal lengths of the single lens elements L1, L2, L3, L4, and L5. That is, |f6| << |f1|, |f2|, |f3|, |f4|, and |f5|. For example, |f1|, |f2|, |f3|, |f4|, and |f5| can be more than 100% larger than |f6|. L2, L4, and L6 are made from glass with a refractive index n > 1.7. P G1 and P6 are similar. That is, P G1 / P6 does not vary by more than 10% from 1. Specifically, Table 10 shows the power P i , the ratio of |f / f6| and each P i and P G1 The ratio between

[0104] [Table 10]

[0105] 7 shows yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 700. Lens system 700 includes a G1 and G2 split pop-out lens 702, an image sensor 704, and optionally, an optical element 706. Image sensor 204 may have an SD of 21.5 mm (a "1 / 0.8" sensor). Table 11 provides the surface types, and Table 12 provides the aspheric coefficients.

[0106] [Table 11]

[0107] [Table 12-1]

[0108] [Table 12-2]

[0109] The power arrangement of lens elements L1 through L7 is as follows: ++-+-+- (plus, plus, minus, plus, minus, plus, minus). See Table 13. L5 and L6 (the last two lens elements of G1) are both Abbe-# L5+L6 =79.38 and EFL L5+L6 = 49.75 mm. |f4| is much smaller than the focal lengths of all 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 more than 80% greater than |f4|.

[0110] The deflection point of L1 is located at a distance of 3.275 mm measured from the front OA and 2.749 mm measured from the rear OA. G1 and P3, and P G1 and P6 are similar. That is, P G1 / P3 and P G1 / P6 does not vary by more than 20% from 1. L4 is made of glass with a refractive index n>1.7. Specifically, Table 13 shows the power P i , each P i and P G1 The ratio between |f / f4|, the ratio of |f / f4|, and the refractive index of each lens element are shown.

[0111] [Table 13]

[0112] 8 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 800. Lens system 800 includes a G1 and G2 split pop-out lens 802, an image sensor 804, and optionally, an optical element 806. Image sensor 804 may have an SD of 21.5 mm. Table 14 provides only the surface types, and Table 15 provides the aspheric coefficients.

[0113] [Table 14]

[0114] [Table 15-1]

[0115] [Table 15-2]

[0116] The lens power arrangement for L1 to L7 is ++-+-+- (plus, plus, minus, plus, minus, plus, minus). The deflection point of L1 is located at a distance of 1.989 mm measured from the front OA and 1.95 mm measured from the rear OA. G1 and P6 as well as P G1 and P7 are similar. G1 / P6 and P G1 / P7 does not vary by more than 20% from 1. Specifically, Table 16 shows the power P i and each P i and P G1 and the ratio between

[0117] [Table 16]

[0118] FIG. 9 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 900. Lens system 900 includes a pop-out lens 902 divided into G1 and G2, an image sensor 904, and optionally, an optical element 906. Image sensor 904 may have an SD of 21.5 mm. G1 includes five lens elements, and G2 includes one lens element. Table 17 provides the surface types, and Table 18 provides the aspheric coefficients.

[0119] [Table 17]

[0120] [Table 18-1]

[0121] [Table 18-2]

[0122] The lens power arrangement from L1 to L6 is +-+-+- (plus, minus, plus, minus, plus, minus). G1 and P1 are similar. That is, P G1 / P1 does not vary by more than 20% from 1. Specifically, Table 19 shows the respective P i and P G1 The power between i and ratio.

[0123] [Table 19]

[0124] 10 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1000. Lens system 1000 includes a G1 and G2 split pop-out lens 1002, an image sensor 1004, and optionally, an optical element 1006. Image sensor 204 may have an SD of 21.5 mm. Table 20 provides the surface types, and Table 21 provides the aspheric coefficients.

[0125] [Table 20]

[0126] [Table 21-1]

[0127] [Table 21-2]

[0128] The series of lens powers from L1 to L7 is +--+-+- (plus, minus, minus, plus, minus, plus, minus). P G1 and P6 are similar. That is, P G1 / P6 does not vary by more than 20% from 1. L4 and L6 are made from glasses with refractive index n>1.7. Specifically, Table 22 shows the power P i , each P i and P G1 and the refractive index of the lens element.

[0129] [Table 22]

[0130] 11 shows yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1100. Lens system 1100 includes a G1 and G2 split pop-out lens 1102, an image sensor 1104, and optionally, an optical element 1106. Image sensor 1104 may have an SD of 21.5 mm. Table 23 provides the surface types and Table 24 provides the aspheric coefficients.

[0131] [Table 23]

[0132] [Table 24-1]

[0133] [Table 24-2]

[0134] The power of the lenses from L1 to L7 is +-++-+- (plus, minus, plus, plus, minus, plus, minus). G1 and P1 as well as P G1 and P7 are similar. G1 / P1 and P G1 / P7 does not vary by more than 10% from 1. L4 and L6 are made from glasses with refractive index n>1.7. Specifically, Table 25 shows the power P i , each P i and P G1 and the refractive index of the lens element.

[0135] [Table 25]

[0136] 12 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1200. Lens system 1200 includes a G1 and G2 split pop-out lens 1202, an image sensor 1204, and optionally, an optical element 1206. Image sensor 1204 may have an SD of 21.5 mm. Table 26 provides the surface types and Table 27 provides the aspheric coefficients.

[0137] [Table 26]

[0138] [Table 27-1]

[0139] [Table 27-2]

[0140] The series of lens powers from L1 to L7 is +-+-+ (plus, minus, plus, minus, plus). G1 and P1 as well as P G1 and P5, P G1 and P7 are similar. G1 / P1 and P G1 / Not just P5 but P G1 / P7 also does not vary by more than 20% from 1. Specifically, Table 28 shows the respective P i and P G1 The power between i and ratio.

[0141] [Table 28]

[0142] 13 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1300. Lens system 1300 includes a G1 and G2 split pop-out lens 1302, an image sensor 1304, and optionally, an optical element 1306. Image sensor 1304 may have an SD of 21.5 mm. Table 29 provides the surface types, and Table 30 provides the aspheric coefficients.

[0143] [Table 29]

[0144] [Table 30]

[0145] The series of lens powers from L1 to L7 is +-+--+- (plus, minus, plus, minus, minus, plus, minus). P G1 P6 and P7 are similar. That is, P G1 / P6 and P G1 / P7 does not vary by more than 20% from 1. Specifically, Table 31 shows that -P i , and each P i and P G1 The ratio of

[0146] [Table 31]

[0147] 14 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1400. Lens system 1400 includes a pop-out lens 1402 divided into G1 and G2, an image sensor 1404, and optionally, an optical element 1406. Image sensor 1404 may have an SD of 21.5 mm. G1 includes six lens elements and G2 includes two lens elements. Table 32 provides the surface types and Table 33 provides the aspheric coefficients.

[0148] [Table 32]

[0149] [Table 33-1]

[0150] [Table 33-2]

[0151] The power of the lenses in the series L1 through L8 is +++-+-++ (plus, plus, plus, minus, plus, minus, plus, plus). G1 and P6 as well as P G1 and P8 are similar. G1 / P6 and P G1 / P8 does not vary by more than 20% from 1. Specifically, Table 34 shows the respective P i and P G1 The power between i and ratios are shown.

[0152] [Table 34]

[0153] 15 illustrates yet another embodiment of a 2G pop-out optical lens system disclosed herein and designated 1500. Lens system 1500 includes a pop-out lens 1502 divided into G1 and G2, an image sensor 1504, and optionally, an optical element 1506. Image sensor 1504 may have an SD of 21.5 mm. G1 includes six lens elements and G2 includes one lens element. Table 35 provides the surface types and Table 36 provides the aspheric coefficients.

[0154] [Table 35]

[0155] [Table 36-1]

[0156] [Table 36-2]

[0157] The lens power arrangement of the lens elements L1 to L7 is +--+-++- (plus, minus, minus, plus, minus, plus, plus, minus). The deflection point of L1 is located at a distance of 2.16 mm measured from the OA of the rear surface. P G1 and P3, P G1 and P G6、 P G1 and P8 are similar. That is, P G1 / P3 and P G1 / Not only P6 but also P G1 / P8 also does not vary by more than 10% from 1. Specifically, Table 37 shows the respective P i and P G1 P i It shows the power and ratio.

[0158] [Table 37]

[0159] 16 shows one embodiment of a 1G pop-out optical lens system disclosed herein and designated 1600. Lens system 1600 includes a pop-out lens 1602, an image sensor 1604, and optionally, an optical element 1606. Image sensor 1604 may have an SD of 16.0 mm. Table 38 provides the surface types and Table 39 provides the aspheric coefficients.

[0160] [Table 38]

[0161] [Table 39-1]

[0162] [Table 39-2]

[0163] The thickness profile of L5 (thickness measured along the z-axis) taken along the y-axis and starting at the OA of lens 1602 has a maximum at the OA, and the minimum is not at the margin (or boundary) of L5; i.e., the minimum is located at a distance less than DA / 2 from the OA. The thickness profile of L6 taken as described above for L5 has a minimum at the OA, and the maximum is not at the margin of L6. This characteristic of L5 and L6 is beneficial for achieving lenses with low field curvatures. The power arrangement of lens elements L1-L6 is plus, minus, plus, plus, plus, minus. L2 is a strong negative lens, and its magnitude |f2| satisfies |f2| / EFL<1.5.

[0164] 17 shows another embodiment of a 1G pop-out optical lens system disclosed herein and designated 1700. Lens system 1700 includes a pop-out lens 1702, an image sensor 1704, and optionally an optical element 1706. Image sensor 1704 may have an SD of 16.0 mm. Table 40 provides the surface types and Table 41 provides the aspheric coefficients.

[0165] [Table 40]

[0166] [Table 41-1]

[0167] [Table 41-2]

[0168] L1 and L2, as well as L3 and L4, have uniform distances from each other. For all values ​​between OA and DA / 2 along the y-axis, the average distance between L1 and L2, respectively, measured along the z-axis (μ L1-L2 ") and the average distance between L3 and L4 ("μ L3-L4 ") is μ dL1-L2 =0.06mm and μ dL3-L4 = 0.39 mm, and the standard deviation of the mean is π dL1-L2 =0.02mm and π dL3-L4 = 0.07 mm. The ratio of σ to μ is σ for L1, L2, L3, and L4, respectively. dL1-L2 / μ L1-L2 =0.36, σ dL3-L4 / μ L3-L4 =0.17. L1 and L2 ("d L1-L2 ") and L3 and L4 ("d L3-L4 ") and T Lens are d L1-L2 / T Lens=1.03% and d L3-L4 / T Lens = 5.2%. L1 and L2 are very close to each other and resemble a doublet lens.

[0169] 18 shows another embodiment of a 1G pop-out optical lens system disclosed herein and designated 1800. Lens system 1800 includes a pop-out lens 1802, an image sensor 1804, and optionally, an optical element 1806. Image sensor 1804 may have an SD of 16.0 mm. Table 42 provides the surface types and Table 43 provides the aspheric coefficients.

[0170] [Table 42]

[0171] [Table 43-1]

[0172] [Table 43-2]

[0173] The power arrangement of lens elements L1-L7 is minus, plus, plus, minus, minus, plus, minus. L6 has a deflection point that is not located at the OA, which is beneficial for achieving a lens with low field curvature. The thickness profile of L6, taken along the y-axis and starting from the OA of lens 1802, has a maximum and a minimum at the OA. Here, the location of the minimum is not at the margin of L6. This is beneficial for achieving low field curvature. The surfaces of L1-L5 are all convex. The signs of the Fi arrangement of lens elements L1-L8 are minus, minus, plus, minus, minus, plus, plus, minus.

[0174] L1 and L2, L2 and L3, and L3 and L4 are uniformly spaced from each other. 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, μ dL3-L4 = 0.15 mm, and the standard deviation of the mean is π = 0.09 mm, π dL2-L3 =0.07mm, π dL3-L4 = 0.02 mm. The ratio of the standard deviation to the mean distance is σ for L1, L2 and L2, L3 and L3, and L4, respectively. dL1-L2 / μ L1-L2 =0.88, σ dL2-L3 / μ L2-L3 =0.43,σ dL3-L4 / μ L3-L4 =0.02. OA distance d L1-L2 =0.07mm,d L2-L3 =0.12mm and d L3-L4 = 0.12 mm, and T Lens The ratio of L1-L2 / T Lens =0.93%,d L2-L3 / T Lens =1.56% and d L3-L4 / T Lens =1.47%.

[0175] While the present invention has been described with respect to specific embodiments and generally associated methods, modifications and permutations of the embodiments and methods will be apparent to those skilled in the art. It should be understood that the present invention is not limited to the specific embodiments described herein, but rather is limited only by the scope of the appended claims.

[0176] It will be appreciated that certain features of the subject matter disclosed herein, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the subject matter disclosed herein, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable combination.

[0177] Furthermore, for clarity, the term "substantially" is used herein to imply a possible variation in value within an acceptable range. According to one embodiment, the term "substantially" as used herein should be interpreted to mean a possible variation of up to 10% above or below any particular numerical value. According to another embodiment, the term "substantially" as used herein should be interpreted to mean a possible variation of up to 5% above or below any particular numerical value. According to a further embodiment, the term "substantially" as used herein should be interpreted to mean a possible variation of up to 2.5% above or below any particular numerical value.

[0178] Unless otherwise specified, the use of the expression "and / or" between the last two members of a list of alternatives indicates that one or more of the listed alternatives is appropriate and may be selected.

[0179] When a claim or the specification refers to "a" or "an" element, it is to be understood that such a reference should not be interpreted as referring to only one of that element.

[0180] All patents and patent applications mentioned herein are incorporated by reference in their entirety to the same extent as if each individual patent or patent application was specifically and individually indicated to be incorporated by reference herein. Furthermore, citation or identification of any reference in this application shall not be construed as an admission that such reference is available as prior art to the present disclosure. Different Aspects of the Disclosure [Item 1] 1. A lens system for a compact digital camera, comprising: an image sensor having a sensor diagonal SD; The field of view (FOV) is greater than 60°, and the f-number (f / #) and lens thickness (T Lens"), a back focal length (BFL), an effective focal length (EFL), and a lens having 6≦N≦8 lens elements arranged along a lens optical axis (OA) starting from L1 from the object side to the image side; Each lens element Li has |f i Each focal length f has a magnitude of | i, and the lens has a pop-out total track length TTL<20 mm in a pop-out state and a collapsed total track length c-TTL in a collapsed state; the lens system is configured to switch from a pop-out state to a collapsed state by causing a BFL to collapse; SD≥12mm, BFL>0.15×TTL, ratio c-TTL / SD<0.65, T Lens is the same in the pop-out state and the collapsed state. [Item 2] Item 1, wherein the lens system has a c-TTL / SD>0.4. [Item 3] Item 1. The lens system according to item 1, wherein f / #<2.0. [Item 4] Item 1. The lens system of item 1, wherein N=8 and f / #<1.8. [Item 5] Item 1. The lens system according to item 1, wherein f / #>1.5. [Item 6] Item 1, wherein the lens system has a BFL of 1.5 mm or more. [Item 7] Item 1. The lens system according to item 1, wherein BFL<3.0 mm. [Item 8] Item 1. The lens system according to item 1, wherein c-TTL / SD<0.6. [Item 9] Item 1. The lens system according to item 1, wherein N=6 and c-TTL / SD<0.55. [Item 10] Item 1, wherein the lens system has c-TTL / TTL<0.9. [Item 11] Item 1, wherein the lens system has a BFL>0.15×TTL. [Item 12] Item 2. The lens system according to item 1, wherein BFL>0.2×TTL. [Item 13] Item 2. The lens system according to item 1, wherein SD=16.0 mm. [Item 14] Item 1. The lens system according to item 1, wherein the SD is in the range of 12 to 30 mm. [Item 15] Item 1. The lens system according to item 1, wherein the SD is in the range of 14 to 20 mm. [Item 16] The distance between L1 and L2 is d L1-L2 and the ratio d L1-L2 / T Lens <2%. [Item 17] The distance between L1 and L2 is d L1-L2 and the ratio d L1-L2 / T Lens <1%. [Item 18] The focal length of the strongest lens element is f LS marked with f LS Item 1, wherein the lens system has an EFL<1. [Item 19] The focal length of the second to last lens element is f N-1 marked with f N-1 Item 1, wherein the lens system has an EFL < 2. [Item 20] The focal length of the second to last lens element is f N-1 marked with f N-1 Item 1, wherein the lens system has an EFL < 1.5. [Item 21] Item 1. The lens system of item 1, wherein N=6, and wherein a thickness profile of L5 taken along an axis perpendicular to the OA of the lens has a local minimum, and the location of the local minimum is not at a margin of L5. [Item 22] Item 1. The lens system of item 1, wherein N=6, and wherein a thickness profile of L5 taken along an axis perpendicular to the OA of the lens has a local minimum, and the location of the local minimum is not at a margin of L5. [Item 23] Item 1, wherein N=6, and wherein a thickness profile of L6 taken along an axis perpendicular to the OA of the lens has a local maximum, and the location of the local maximum is not at a margin of L6. [Item 24] Item 2. The lens system according to item 1, wherein N=6 and the lens power arrangement of the lens elements L1 to L6 is plus, minus, plus, plus, plus, minus. [Item 25] N=7, and the average distance between L1 and L2 measured along an axis parallel to the OA is μ L1-L2 The average distance marked with "σ L1-L2 and the standard deviation from the mean distance marked σ dL1-L2 / μ L1-L2 <0.5. [Item 26] N=7, the average distance between L3 and L4 measured along an axis parallel to the OA, μ L3-L4 The average distance marked with "σ L3-L4 and the standard deviation from the mean distance marked σ dL3-L4 / μ L3-L4 <0.3. [Item 27] Item 1. The lens system according to item 1, wherein N=7 and L6 has a deflection point that is not located on the OA of the lens. [Item 28] Item 2. The lens system according to item 1, wherein N=7 and the arrangement of lens powers for lens elements L1 to L7 is minus, plus, plus, minus, minus, plus, minus. [Item 29] Item 1, wherein N=8 and a thickness profile of L6 taken along an axis perpendicular to the OA of the lens has a local minimum, and the location of the local minimum is not at a margin of L6. [Item 30] The lens system of item 1, wherein N=8 and the lens power arrangement of the lens elements L1 to L8 is minus, minus, plus, minus, minus, plus, plus, minus. [Item 31] N=8, and the average distance between L1 and L2 measured along an axis parallel to the OA is μ L1-L2 The average distance marked with and σ L1-L2 and the standard deviation from the mean distance marked σ dL1-L2 / μ L1-L2 <1.25. [Item 32] N=8, and the average distance between L2 and L3 measured along an axis parallel to the OA is μ L2-L3 The average distance marked with and σ L2-L3 and the standard deviation from the mean distance marked σ dL2-L3 / μ L2-L3 <0.75. [Item 33] N=8, and the average distance between L3 and L4 measured along an axis parallel to the OA is μ L3-L4 The average distance marked with and σ L3-L4 and the standard deviation from the mean distance marked σ dL3-L4 / μ L3-L4 <0.1. [Item 34] Item 34. The lens system of any one of items 1 to 33, wherein the lens system is included in a pop-out camera, and the pop-out camera is included in a smartphone. [Brief explanation of the drawings]

[0181] [Figure 1A] FIG. 1A shows a schematic definition of various entities such as TTL and EFL. [Figure 1B] FIG. 1B shows the definitions of FOV, EFL, and S for a thin lens approximation or equivalent. [Figure 2A] FIG. 2A is a diagram illustrating a schematic of the pop-out optical lens system disclosed herein in a pop-out state focused at infinity. [Figure 2B] FIG. 2B is a schematic diagram of the pop-out system of FIG. 2A in a folded state. [Figure 2C] FIG. 2C illustrates a schematic diagram of another pop-out optical lens system disclosed herein in a pop-out state. [Figure 2D] FIG. 2D is a schematic diagram of the pop-out system of FIG. 2C in a collapsed state. [Figure 3A] FIG. 3A shows the pop-out system of FIG. 2A focused at a closer distance (eg, 50 cm) using the first method of focusing. [Figure 3B] FIG. 3B shows the pop-out system of FIG. 2A focused at a closer distance (eg, 50 cm) using a second focusing technique. [Figure 4] FIG. 4 illustrates one embodiment of the pop-out optical lens system disclosed herein. [Figure 5] FIG. 5 illustrates another embodiment of the pop-out optical lens system disclosed herein. [Figure 6] FIG. 6 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 7] FIG. 7 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 8] FIG. 8 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 9] FIG. 9 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 10]FIG. 10 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 11] FIG. 11 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 12] FIG. 12 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 13] FIG. 13 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 14] FIG. 14 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 15] FIG. 15 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 16] FIG. 16 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 17] FIG. 17 illustrates yet another embodiment of the pop-out optical lens system disclosed herein. [Figure 18] FIG. 18 illustrates yet another embodiment of the pop-out optical lens system disclosed herein.

Claims

1. 1. A lens system for a compact digital camera, comprising: an image sensor having a sensor diagonal SD; a lens having a field of view FOV>60 deg and including N≧7 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side to the image side; Each lens element Li has |f ｉ Each focal length f ｉ wherein the lens elements are divided into two lens groups G1 and G2 separated by a large gap (BG); the lens has a pop-out total track length (TTL) of less than 20 mm in a pop-out state and a collapsed total track length (c-TTL) in a collapsed state; The lens system is configured to switch from a popped-out state to a collapsed state and vice versa only by collapsing BG to c-BG without changing the distance between the lens elements comprised in G1 and G2, respectively, wherein BG>0.25×TTL, SD≧12 mm, and the ratio c-TTL / SD<0.

7.

2. The lens system of claim 1 , wherein N=8.

3. The lens system of claim 1 , wherein G1 includes five or more lens elements and G2 includes one or two lens elements.

4. 2. The lens system of claim 1, wherein c-TTL / SD<0.

65.

5. 2. The lens system of claim 1, wherein c-TTL / SD<0.

6.

6. 2. The lens system of claim 1, wherein c-TTL / SD>0.

3.

7. 2. The lens system of claim 1, wherein c-TTL / TTL<0.

7.

8. 2. The lens system of claim 1, wherein c-TTL / TTL<0.

65.

9. 2. The lens system of claim 1, wherein BG>0.3×TTL.

10. The lens system of claim 1 with BG>0.35×TTL.

11. Thickness T of G1 Ｇ１ is 0.35 × TTL < T Ｇ１ The lens system of claim 1 , wherein the lens system satisfies <0.47×TTL.

12. G1 Power P Ｇ１ P Ｇ１ >0, and G2's power P Ｇ２ P Ｇ２ <0.

13. G1 Power P Ｇ１ and G2 Power P Ｇ２ The ratio between -1.81 and P Ｇ１ / P Ｇ２ 2. The lens system according to claim 1, wherein the lens system satisfies ≦−0.

9.

14. A lens system for a compact digital camera, comprising: an image sensor having a sensor diagonal SD; a lens having a field of view FOV>60 deg and including N≧7 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side to the image side; Each lens element Li has a respective focal length f i with magnitude |f i |, said lens elements being divided into two lens groups G1 and G2 separated by a large gap (BG); the lens has a pop-out total track length (TTL) of less than 20 mm in a pop-out state and a collapsed total track length (c-TTL) in a collapsed state; the lens system is configured to switch from a popped-out state to a collapsed state and vice versa by collapsing a BG, where BG>0.25×TTL, SD≧12 mm, and the ratio c−TTL / SD<0.7; A lens system in which N=7 and the lens power arrangement from L1 to L7 is plus, minus, minus, plus, minus, plus, minus.

15. 2. The lens system of claim 1, wherein N=7 and the lens powers L1 through L7 are arranged as follows: plus, minus, plus, minus, minus, plus, minus.

16. A lens system for a compact digital camera, comprising: an image sensor having a sensor diagonal SD; a lens having a field of view FOV>60 deg and including N≧7 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side to the image side; Each lens element Li has a respective focal length f i with magnitude |f i |, said lens elements being divided into two lens groups G1 and G2 separated by a large gap (BG); the lens has a pop-out total track length (TTL) of less than 20 mm in a pop-out state and a collapsed total track length (c-TTL) in a collapsed state; the lens system is configured to switch from a popped-out state to a collapsed state and vice versa by collapsing a BG, where BG>0.25×TTL, SD≧12 mm, and the ratio c−TTL / SD<0.7; A lens system in which N=7 and the lens power arrangement from L1 to L7 is plus, plus, minus, plus, minus, plus, minus.

17. A lens system for a compact digital camera, comprising: an image sensor having a sensor diagonal SD; a lens having a field of view FOV>60 deg and including N≧7 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side to the image side; Each lens element Li has a respective focal length f i with magnitude |f i |, said lens elements being divided into two lens groups G1 and G2 separated by a large gap (BG); the lens has a pop-out total track length (TTL) of less than 20 mm in a pop-out state and a collapsed total track length (c-TTL) in a collapsed state; the lens system is configured to switch from a popped-out state to a collapsed state and vice versa by collapsing a BG, where BG>0.25×TTL, SD≧12 mm, and the ratio c−TTL / SD<0.7; A lens system in which N=7 and the lens power arrangement from L1 to L7 is plus, minus, plus, plus, minus, plus, minus.

18. A lens system as described in claim 1, wherein N=8 and the arrangement of lens powers from L1 to L8 is plus, minus, minus, plus, minus, plus, plus, minus.

19. The lens system of claim 1, wherein the lens is included in a pop-out camera having a sensor with a sensor diagonal SD in the range of 12 to 30 mm.

Images