Slim Pop-Out Tele Camera Lens

Abstract

A lens system for a compact digital camera, the lens system having a pop-out state and a collapsed state, an image sensor having a sensor diagonal SD, and a lens having N≧6 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side toward the image side, each lens element Li having a respective clear aperture diameter DA Li and 1≦i≦N, the lens having, in the pop-out state, a field of view 35deg<FOV<50deg, an f-number (f / #), a lens thickness T Lens , a back focal length BFL, an effective focal length EFL, and a total track length TTL<20mm, the lens having, in the collapsed state, a collapsed total track length c-TTL, where c-TTL=T Lens +1mm, EFL≧10mm, f / #<2, and a ratio c-TTL / EFL<0.8.

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 / 305,455, filed February 1, 2022, and U.S. Provisional Patent Application No. 63 / 328,304, filed April 7, 2022, which are incorporated by reference herein in their entireties.

[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, the following symbols and abbreviations are used for optical and other properties referred to throughout the specification and drawings. All terms are known in the art.

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

[0005] - Back focal length (BFL): The minimum distance between a point on the rear surface S2N of the last lens element LN and the image sensor, measured along an axis parallel to the optical axis of the lens, when the system is focused at 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 (assembly of lens elements L1 to LN).

[0007] - f-number (f / #): the ratio of EFL to the lens opening diameter (aperture diameter) ("DA"): f / #=EFL / DA.

[0008] The focal length f of an individual lens element i The focal length of each lens element is indicated by its element number. That is, the focal length of L1 is f 1 , the focal length of L2 is f 2 etc. are shown.

[0009] (background) Digital multi-cameras are standard in today's mobile electronic devices (or "mobile devices", eg, smartphones, tablets, etc.). These include two or more cameras with lenses having different effective focal lengths (EFL), which capture images of the same scene at different fields of view (FOV). For example, a multi-camera system may include a wide camera FOV ("FOV") of, say, 65-95 degrees. W ") and a narrower FOV ("FOV T "), and may include a tele (or "zoom") camera that has a higher spatial resolution (or pixel resolution) than the wide camera. The spatial resolution of the tele camera may be, for example, 1.5 to 10 times that of the wide camera, and is referred to as a 1.5 to 10 times zoom factor ("ZF").

[0010] The main challenge is to design a telecamera with (1) a ZF higher than 1.5x zoom, (2) a low F / #, and (3) a low camera module height that fits into slim mobile devices with device heights of, for example, less than 15mm. The camera module height is mainly determined by the total track length (TTL) of the camera lens. Figure 1A shows a schematic definition of various lens entities such as TTL, effective focal length (EFL) and back focal length (BFL).

[0011] The zoom of a camera is related to the "magnification" M of the object image at the image sensor plane, and is given by Equation 1:

number

number

number

[0012] A pop-out camera combines the advantages of providing a large TTL for large zoom when the camera is in use ("pop-out state") and a slim design by collapsing the TTL into a collapsed TTL ("c-TTL") when the camera is not in use ("collapsed state"). Pop-out cameras are described, for example, in co-owned International Patent Application PCT / IB2020 / 058697. FIG. 1B shows a schematic representation of a mobile device 100 including a pop-out camera 110 in a known collapsed state. The c-TTL is compatible with modern mobile device heights (or thicknesses), i.e., in the collapsed state, the pop-out camera 110 does not exceed the height of the mobile device 100. FIG. 1C shows a schematic representation of a mobile device 100 including a pop-out camera 110 in a pop-out state, i.e., when the pop-out camera is active. In the pop-out state, the pop-out camera 110 has a second TTL ("TTL"). As such, the pop-out camera 110 exceeds the height of the mobile device 100, i.e., the pop-out camera 110 protrudes (or "pops out") from the mobile device 100. Typically, the thickness ("T") of the mobile device is about T=5 mm to 15 mm. The pop-out camera may protrude from the mobile device 100 by about 1 mm to 10 mm (i.e., may exceed the T of the mobile device 100). The mobile device 100 has a back surface (or "rear surface") 102 that includes the pop-out camera 110. The mobile device 100 has a front surface 104 that is oriented parallel to the back surface 102 and faces (or "orients") in a direction opposite to the direction in which the back surface 102 faces. The front surface 104 may include, for example, a screen (not shown). It would be beneficial to have a telelens design that supports a pop-out telecamera with a large EFL of EFL≧10mm for a high ZF, a low f-number of f / #<2, and a c-TTL / EFL ratio that meets c-TTL / EFL<0.8 for a low camera module height.

[0013] (overview) In various exemplary embodiments, a lens system for a compact digital camera having a pop - out state and a collapse state is provided. The lens system includes an image sensor having a sensor diagonal SD, and a lens having N≧6 lens elements L1 to LN arranged along a lens optical axis (OA) starting from L1 from the object side towards the image side. Each lens element Li has its respective clear aperture diameter, where 1≦i≦N. In the pop - out state, the lens has a field of view 35deg < FOV < 50deg, f - number (f / #), lens thickness T Lens , back focal length BFL, effective focal length EFL, and total track length TTL < 20mm. In the collapse state, the lens has a collapsed total track length c - TTL, where c - TTL = T Lens +1mm, EFL≧10mm, f / # < 2, and the ratio c - TTL / EFL < 0.8.

[0014] In some examples, the lens system switches from the pop - out state to the collapse state, or vice versa, by folding the BFL to a collapsed BFL (c - BFL).

[0015] In some examples, c - TTL / EFL < 0.75. In some examples, c - TTL / EFL < 0.7.

[0016] In some examples, 0.9×EFL < TTL < 1.1×EFL.

[0017] In some examples, 8mm < SD < 15mm.

[0018] In some examples, EFL≧12mm. In some examples, EFL≦20mm.

[0019] In some examples, TTL < 15mm.

[0020] In some instances, f / #<1.9. In some instances, f / #<1.8. In some instances, f / #<1.7.

[0021] In some instances, T Lens / TTL<0.75. In some cases, T Lens / TTL<0.7.

[0022] In some instances, BFL>0.3×TTL.

[0023] In some instances, 0.04≦c-BFL / BFL<0.9.

[0024] In some instances, D.A. L1 / DA L4 >1.15 and DA LN / DA L4 >1.15. In some cases, DA L1 / DA L4 >1.25 and DA LN / DA L4 >1.25. In some cases, DA L1 / DA L5 >1.25 and DA LN / DA L5 >1.25. In some cases, DA L1 / DA L4 >1.35 and DA LN / DA L4 >1.35. In some cases, 0.9 <DA L1 / DA LN <1.15.

[0025] In some examples, the lens has a 35 mm equivalent focal length (35 mm EqFL), where 35 deg<35 mm EqFL<70 deg. In some examples, 40 deg<35 mm EqFL<55 deg.

[0026] In some examples, lens elements L1, L2, L3 and L4 have respective air gaps therebetween along the OA, the air gaps having respective widths d12, d23 and d34, each of d12, d23 and d34 being less than 0.5 mm. In some examples, the ratios of each of d12, d23 and d34 to the TTL, d12 / TTL, d23 / TTL and d34 / TTL are less than 5%.

[0027] In some examples, the thickness of L2 along the OA is 80% or more greater than the thicknesses of other lens elements along the OA.

[0028] In some examples, the magnitude of the lens power of L1 is less than the magnitude of the lens power of the other lens elements.

[0029] In some examples, the air gap d34 along the OA between L3 and L4 and the air gap d45 along the OA between L4 and L5 are 60% or more larger than other air gaps between lens elements.

[0030] In some examples, L1 and L2 form a doublet lens. In some examples, L2 and L3 form a doublet lens. In some examples, L4 and L5 form a doublet lens. In some examples, L6 and L7 form a doublet lens.

[0031] In some examples, L1 and L2, respectively, have thicknesses T1 and T2 along the OA greater than 1 mm, respective refractive indices n1 and n2 less than 1.55, respective Abbe numbers v1 and v2 greater than 50, and respective lens powers are positive.

[0032] In some examples, the thicknesses T2 and T3 of L2 along the OA are Lens The ratio of T2 / T Lens >0.3.

[0033] The pairs of lens elements L1 and L2, L3 and L4, and L6 and L7 form respective doublet lenses.

[0034] In some instances, L1 is made of glass and the Abbe number of L1 is greater than 50.

[0035] In some examples, N=7 and lens elements L1-L7 have a power sequence of plus-minus-plus-minus-plus-minus-minus.

[0036] In some examples, the image-facing rear surface of L1 has a deflection point that is not located on the OA.

[0037] In some cases, L2 is the focal length f 2 has magnitude |f 2 | is |f 2 | / EFL<1.

[0038] In some cases, L1 is the focal length f 1 has magnitude |f 1 | is |f 1 | / EFL<0.5. In some instances, f / #≦1.9.

[0039] In some examples, N=7 and lens elements L1-L7 have a power sequence of plus-minus-minus-plus-plus-minus-minus.

[0040] In some examples, the air gap d67 between L6 and L7 along the OA is d67 / T Lens >0.125.

[0041] In some cases, L1 is the focal length f 1 has magnitude |f 1 | is |f 1 | / EFL<0.75 is satisfied.

[0042] In some examples, N=6, and the lens elements L1-L6 have a power sequence of plus-plus-minus-plus-minus-minus. In some such examples, the thickness T2 of L2 along the OA and the thicknesses T of the other lens elements are i (i=1, 3, . . . , N) ratio T2 / T i In some such examples, the thicknesses T2 and T3 of L2 along the OA are Lens The ratio of T2 / T Lens >0.15. In some such examples, the magnitude of the lens power of L1 is less than the magnitude of the lens power of the other lens elements. In some such examples, L2 and L3 form a doublet lens. In some such examples, |f 2 | is |f 2 | / EFL<0.75. In some such cases, L3 is the focal length f 3 has magnitude |f 3 | is |f 3 | / EFL<1. In some such cases, L1 is the focal length f 1 has magnitude |f 1 | is |f 1 | / EFL>10. In some such instances, L2 is made of glass and the Abbe number of L2 is greater than 50.

[0043] In some such examples, N=7, and the lens elements L1-L7 have a power sequence of plus-plus-minus-plus-plus-minus. In some such examples, L6 and L7 form an inverse doublet lens. In some such examples, L1 and L2 each have a thickness T1, T2>1 mm along the OA, each have a refractive index n1, n2<1.55, each have an Abbe number v1, v2>50, and each have a positive lens power. In some such examples, the rear surface of L2 facing the image side has a deflection point that is not located at the OA. In some such examples, L7 has a focal length f 7 has magnitude |f 7 | is |f 7| / EFL<0.75. In some such examples, f / #≦1.8.

[0044] In some instances, the ratio of T2 to lens thickness is T2 / T Lens >0.2, or T2 / T Lens >0.2. In some such examples, the rear surface of L2 has a deflection point that is not located on the OA. In some such examples, f / #≦1.9. In some such examples, the pairs of lens elements L1 and L2, L3 and L4, and L6 and L7 each form an inverse doublet lens. In some such examples, |f 1 | / EFL>50. In some such cases, L6 is the focal length f 6 has magnitude |f 6 | is |f 6 | / EFL<1. In some such cases, L7 is the focal length f 7 has magnitude |f 7 | is |f 7 | / EFL<1.

[0045] In some such examples, d12 / TTL and d34 / TTL are less than 2.5%. In some such examples, the pair of lens elements L6, L7 form an inverse doublet lens. In some such examples, L4 has a focal length f 4 has magnitude |f 4 | is |f 4 | / EFL<1. In some such cases, |f 6 | / EFL<1. In some such cases, |f 7 | / EFL<1. In some such instances, f / #≦1.9.

[0046] In some such examples, N=7 and lens elements L1 through L7 have a power sequence of minus-plus-minus-plus-minus-plus. In some such examples, the pairs of lens elements L1 and L2, L3 and L4, and L6 and L7 each form an inverse doublet lens. In some such examples, |f1 |~|f 7 Each of |f 1 | / EFL~|f 7 | / EFL>1. In some such examples, f / #≦1.9.

[0047] In some such examples, N=7 and lens elements L1-L7 have a power sequence of plus-minus-plus-plus-minus-minus-minus. In some such examples, f / #≦1.8, f / #≦1.7, or f / #≦1.65. In some such examples, L1 is the thickest lens element in the lens and has a thickness T1, L3 is the second thickest lens element in the lens and has a thickness T3, and L6 is the third thickest lens element in the lens and has a thickness T6, where T1 / T6>3 and T3 / T6>3. In some such examples, DA L1 / DA L5 >1.75 and DA L1 / DA LN In some such cases, the DA L1 ≧7.5 mm. In some such examples, L2 and L3 form an inverse doublet lens, and L4 and L5 form a doublet lens. In some such examples, |f 1 | / EFL<1. In some such cases, |f 6 | / EFL>100. In some such cases, |f 7 | / EFL>20.

[0048] In various exemplary embodiments, a lens system as described above or below is incorporated into a camera module, and the camera module is incorporated into a smartphone, the smartphone having a back surface, and the OA of a pop-out lens is oriented perpendicular to the back surface of the smartphone.

[0049] BRIEF DESCRIPTION OF THE DRAWINGS Non-limiting examples of the embodiments disclosed herein are described below in connection with the drawings attached hereto, which are listed after this paragraph. Identical structures, elements, or parts that appear in more than one figure are generally labeled with the same numbers 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 numbers in all figures in which they appear. The drawings and descriptions are meant to clarify the embodiments disclosed herein and should not be considered as limiting in any way.

[0050] In the drawings: Figure 1A shows,schematically the definition of various entities such as TTL and EFL; FIG. 1B illustrates a schematic diagram of a mobile device including a known collapsed pop-out camera; FIG. 1C illustrates the mobile device of FIG. 1B with the pop-out camera in a pop-out state; FIG. 2A illustrates a schematic of the pop-out optical lens system disclosed herein in a pop-out state; FIG. 2B shows a schematic of the pop-out system of FIG. 2A in a collapsed state; FIG. 3 shows an example of a pop-out optical lens system disclosed herein; FIG. 4 shows another example of a pop-out optical lens system disclosed herein; FIG. 5 illustrates yet another example of a pop-out optical lens system disclosed herein; FIG. 6 illustrates yet another example of a pop-out optical lens system disclosed herein; FIG. 7 illustrates yet another example of a pop-out optical lens system disclosed herein; FIG. 8 illustrates yet another example of a pop-out optical lens system disclosed herein; FIG. 9 illustrates yet another example of a pop-out optical lens system as disclosed herein; FIG. 10 illustrates yet another example of a pop-out optical lens system disclosed herein; FIG. 11 illustrates yet another example of a pop-out optical lens system as disclosed herein.

[0051] (Detailed Description) FIG. 2A shows the lens thickness T Lens 2 illustrates an example of a pop-out optical lens system 200 as disclosed herein in a pop-out state, comprising a pop-out lens 202 having a lens optical axis as shown, and an image sensor 204. The pop-out lens 202 has a lens optical axis as shown.

[0052] 2B illustrates the pop-out optical lens system 200 in a collapsed state. The BFL is folded into a collapsed BFL (denoted as "c-BFL"), i.e., the distance between the lens 202 and the image sensor 204 is reduced, resulting in a collapsed TTL ("c-TTL"). The fundamental lower limit for c-TTL is the thickness of the lens 202 ("T Lens "), i.e., c-TTL>T Lens In fact, c-TTL=T Lens +c-BFL, where c-BFL=0.2mm to 1.5mm or more. That is, c-TTL=T Lens +0.2mm~T Lens It will be +1.5mm or more.

[0053] The pop-out optical lens system 200 can be used for a pop-out camera, so that the pop-out camera can only operate as a camera in the pop-out state, and in the collapse state, the pop-out camera does not operate as a camera, i.e., is inactive.

[0054] The pop-out optical lens system 200 is a "one group" (or "1G") pop-out optical lens system, i.e., the lens 202 moves as a unit, meaning that the distance between the lens elements in the lens 202 does not change when switching from the popped-out state to the collapsed state, only the BFL changes.

[0055] To perform optical image stabilization (OIS) in a pop-out camera, the pop-out camera can use several methods known in the art. Such methods may be "lens-shift OIS" or "sensor-shift OIS". In "lens-shift OIS", the lens moves radially along two directions perpendicular to the lens optical axis and moves relative to the image sensor and camera host device for OIS. In "sensor-shift OIS", the image sensor moves along two directions perpendicular to the lens optical axis and perpendicular to each other and moves relative to the lens and camera host device for OIS.

[0056] All of the pop-out optical lens systems described herein can be focused by moving the entire lens, such as lens 202, along the lens optical axis relative to the image sensor, or by moving the image sensor relative to the lens.

[0057] The lens 202 includes a number of N lens elements Li (where "i" is an integer between 1 and N, and N may be, for example, 6, 7 or more). 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 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 scheme is used throughout this specification. Alternatively, as is done throughout this specification, the lens surfaces are denoted as "Sk", where k is from 1 to 2N. The front and back surfaces may be aspheric in some cases. However, this is not limited to this. The thickness of the i-th lens element Li is T iAs 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).

[0058] Assuming a first optical lens system includes a lens with N lens elements and a second optical lens system includes a lens with N+1 lens elements, and it is desired to replicate all of the optical properties of the first optical lens system, one can take a single specific lens element from the first optical lens system and design a sub-lens system that includes two lens elements that exactly replicate the optical properties of the single specific lens element. All of the pop-out optical lens systems disclosed herein can be used in the pop-out camera example described in commonly owned PCT patent application PCT / IB2020 / 058697.

[0059] All pop-out optical lens systems disclosed herein are shown in the pop-out state. They are switched between the pop-out state and the collapsed state by folding the BFL into a c-BFL, as shown in Figures 2A-B. In the collapsed state, all pop-out optical lens systems disclosed herein have a c-BFL between 0.2 mm and 4.5 mm. The small c-BFL and small T Lens is useful for realizing a slim camera module that can be incorporated into a slim mobile device such as a smartphone. For clarity, all lens systems disclosed herein can be beneficially included or incorporated into a smartphone. The optical axis of the pop-out lens can be oriented perpendicular to the back surface of the smartphone that includes the pop-out camera (see, for example, Figures 1B and 1C). An example of a smartphone that includes a pop-out camera is described in PCT / IB2020 / 058697.

[0060] Table 1 shows the values ​​and ranges included in the embodiments 300-1100 of the optical lens system disclosed herein (TTL, c-TTL, EFL, BFL, c-BFL, SD, T Lens , DA is given in mm, half field of view ("HFOV") and 35mm equivalent focal length ("35mm EqFL") are given in degrees, power sequence and #DA MIN is given without units).

[0061] c-TTL MIN , c-TTL MID , c-TTL MAX , c-BFL MIN , c-BFL MID , c-BFL MAX refers to the minimum, medium, and maximum c-TTL and c-BFL achievable in each embodiment, respectively. MID and c-TTL MID refers to the intermediate c-BFL = 1 mm.

[0062] "#DA MIN " represents the number i of the lens element Li in the lens that has the smallest aperture diameter ("DAi"). The "DAi" of a lens element is given by the larger value of either the front or back surface.

[0063] In general, in Table 1, "MIN" and "MAX" refer to the minimum and maximum values, respectively, in a range of values. [Table 1]

[0064] 3 illustrates one embodiment of a pop-out optical lens system disclosed herein, numbered 300. Lens system 300 includes a pop-out lens 302, an image sensor 304, and an optional optical element ("window") 306. Optical element 306 may be, for example, an infrared (IR) filter and / or a glass image sensor dust cover. Pop-out lens 302 has a lens optical axis 308.

[0065] The light rays pass through a lens 302 and form an image on an image sensor 304. Figure 3 shows three fields with three rays: an upper ray, a lower ray, and a chief ray. All subsequent figures also show these three rays.

[0066] Detailed optical and surface data of the pop-out lens 302 are shown in Tables 2-3. Table 2 shows the surface types and Table 3 shows the aspheric coefficients.

[0067] The surface types are: a) Plano: Flat surface, no curvature b) Q type 1 (QT1) surface sag formula:

number

number

[0068] The reference wavelength is 555.0 nm. The units in Table 2 are mm, except for the refractive index ("index") and Abbe number. Each lens element Li has its own focal length f given in Table 2. i 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 in all the following tables. [Table 3-1] [Table 3-2] [Table 3-3]

[0069] S3, the back surface of L1, has a deflection point that is not located on the optical axis ("OA"). Each air gap between L1, L2, L3, and L4 is less than 0.5 mm. This allows for a small T Lens , and thus small c-TTL is possible. The ratios of the air gap between L1 and L2 ("d12"), L2 and L3 ("d23"), and L3 and L4 ("d34") to TTL are d12 / TTL, d23 / TTL, and d34 / TTL<5%, respectively. This is valid not only for the optical lens system 300, but also for the optical lens systems 400 and 500.

[0070] L1 and LN (here L7) have a DAi that is 30% or more larger than the smallest DAi present in the lens (here L5), i.e., DA L1 / DA L5 , D.A. L7 / DA L5 >1.3. The smallest DAi is present at the lens element at the lens center. Therefore, the DAi profile along the z-axis has local maxima at L1 and LN, respectively, and a minimum at the lens center. A "lens element at the lens center" is a lens element LM that is not located at the beginning or end of the lens. Specifically, a "lens element at the lens center" is a lens element LM that is not L1, L2, LN-1, or LN. In all optical lens systems 400 to 1100 disclosed in this specification, M=4 or M=5, and DA L1 / DA LM , D.A. LN / DA LM>1.15. This characteristic is useful for realizing a pop-out telephoto camera that has both a relatively large DA (i.e., a relatively low f / #<2) and a relatively large SD (e.g., SD>8mm).

[0071] L1 and LN have similar DAi. For all optical lens systems 400 to 1100 disclosed herein, DA L1 and D.A. LN The ratio is 0.9 <DA L1 / DA LN <1.15.

[0072] FIG. 4 illustrates one embodiment of a pop-out optical lens system disclosed herein, numbered 400. Lens system 400 includes a pop-out lens 402, an image sensor 404, and an optional optical element 406. Pop-out lens 402 has a lens optical axis 408. Table 4 lists the surface types and Table 5 lists the aspheric coefficients. The air gap or distance between L6 and L7 ("d L6-L7 ") is relatively large, and d L6-L7 = 1.246 mm, d L6-L7 and T Lens The ratio to d L6-L7 / T Lens =0.15. [Table 4] [Table 5-1] [Table 5-2] [Table 5-3]

[0073] 5 illustrates one embodiment of a pop-out optical lens system disclosed herein and designated 500. Lens system 500 includes a pop-out lens 502 having a lens optical axis 508, an image sensor 504, and optionally an optical element 506. Table 6 lists the surface types and Table 7 lists the aspheric coefficients. [Table 6] [Table 7-1] [Table 7-2] [Table 7-3]

[0074] 6 illustrates one embodiment of a pop-out optical lens system disclosed herein and numbered 600. Lens system 600 includes a pop-out lens 602 having a lens optical axis 608, an image sensor 604, and an optional optical element 606. Table 9 lists the surface types and Table 10 lists the aspheric coefficients.

[0075] The thickness of L2 is at least 1.85 times greater than the thickness of the other lens elements of lens 602. Lens The ratio is T2 / T Lens =0.22. The magnitude of the lens power of L1 is smaller than the magnitude of the lens power of the other lens elements of the lens 602. The distances d between L3 and L4 and between L4 and L5, respectively, L3-L4 and d L4-L5 is more than 60% greater than any other distance between lens elements of lens 602.

[0076] L2 and L3 are close to uniform.

[0077] Here, the optical axis ("OA") and the DA i / 2 or D.A.i+1 / 2 (i.e., L i or L i+1 For all values ​​along the y-axis between the upper and lower limits of i , L i+1 A lens pair is defined as "close to uniform" if it satisfies all three of these criteria: 1. L measured along the z-axis at any position along the y-axis i and L i+1 The maximum distance ("Max-d") between and is Max-d Li-Li+1 <0.5mm. 2. L measured along the z-axis i and L i+1 The average distance between Li-Li+1 ") is μ Li-Li+1 <0.15mm. 3. Average μ Li-Li+1 The standard deviation of (σ Li-Li+1 ") is σ Li-Li+1 <0.075mm.

[0078] The lens pair L2, L3 is a "doublet lens" useful for achieving low chromatic aberration. i ,L i+1 If all three criteria are met, the lens pair is defined as a "doublet lens": 1. Lens Pair L i ,L i+1 are uniformly close to each other according to the above definition. 2.L i ,L i+1 The ratio of the refractive index ("n") of i+1 ≧n i +0.03 3. The ratio of Abbe numbers ("v") is v i / v i+1 >1.3.

[0079] Here, the lens pair L i ,L i+1 If all three of these criteria are met, the lens pair is defined as an "inverse doublet lens": 1. Lens Pair L i,L i+1 are close to uniform 2.L i ,L i+1 The ratio of the refractive index ("n") of i ≧n i+1 +0.03 3. The ratio of Abbe numbers ("v") is v i+1 / v i >1.3.

[0080] Table 8 lists all doublet and inverse doublet lenses included in the optical lens system embodiments 300-1100 disclosed herein and their values ​​(Max-d, μ, σ are given in mm, n and v are unitless). "Type" specifies whether the lens pair is a doublet lens ("D") or an inverse doublet lens ("ID"). [Table 8] [Table 9] [Table 10-1] [Table 10-2] [Table 10-3]

[0081] 7 illustrates one embodiment of a pop-out optical lens system disclosed herein and designated 700. Lens system 700 includes a pop-out lens 702 having a lens optical axis 708, an image sensor 704, and an optional optical element 706. Table 11 lists the surface types and Table 12 lists the aspheric coefficients.

[0082] Both L1 and L2 have a relatively large thickness (>1 mm), a low refractive index (<1.55), a high Abbe number (>50), and a positive focal length. The ratio of T2 to the lens thickness is T2 / T Lens = 0.21. L6 and L7 are inverse doublet lenses. This is effective not only for the optical lens system 700 but also for the optical lens system 800. S3 (the rear surface of L1) of the lens system 700 has a deflection point that is not located at OA. [Table 11] [Table 12-1] [Table 12-2] [Table 12-3]

[0083] 8 illustrates one embodiment of a pop-out optical lens system disclosed herein and numbered 800. Lens system 800 includes a pop-out lens 802 having a lens optical axis 808, an image sensor 804, and optionally an optical element 706. Table 13 lists the surface types and Table 14 lists the aspheric coefficients.

[0084] L2 is T2 / T Lens >0.3. S4, the rear surface of L2, has a deflection point that is not located at OA. This is valid not only for optical lens system 800, but also for optical lens systems 900 and 1000. L6, L7 are inverse doublet lenses. [Table 13] [Table 14-1] [Table 14-2] [Table 14-3]

[0085] 9 illustrates one embodiment of a pop-out optical lens system disclosed herein and numbered 900. Lens system 900 includes a pop-out lens 902 having a lens optical axis 908, an image sensor 904, and optionally an optical element 906. Table 15 lists the surface types and Table 16 lists the aspheric coefficients.

[0086] The lens element pairs L1, L2 and L3, L4 and L6, and L7 are inverse doublet lenses. [Table 15] [Table 16-1] [Table 16-2] [Table 16-3]

[0087] 10 illustrates one embodiment of a pop-out optical lens system disclosed herein and numbered 1000. Lens system 1000 includes a pop-out lens 1002 having a lens optical axis 1008, an image sensor 1004, and optionally an optical element 1006. Table 17 lists the surface types and Table 18 lists the aspheric coefficients.

[0088] The lens element pairs L1, L2 and L3, L4 and L6, and L7 are inverse doublet lenses. [Table 17] [Table 18-1] [Table 18-2] [Table 18-3]

[0089] 11 illustrates one embodiment of a pop-out optical lens system disclosed herein and numbered 1100. Lens system 1100 includes a pop-out lens 1102 having a lens optical axis 1108, an image sensor 1104, and optionally an optical element 1106. Table 19 lists the surface types and Table 20 lists the aspheric coefficients.

[0090] The lens element pair L2, L3 is an inverse doublet lens, and the lens element pair L4, L5 is a doublet lens. [Table 19] [Table 20-1] [Table 20-2] [Table 20-3]

[0091] 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.

[0092] It will be appreciated that certain features of the subject matter disclosed herein that 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 that are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable combination.

[0093] Unless otherwise stated, 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 are appropriate and may be selected.

[0094] When a claim or the specification refers to "a" or "an" element, it should be understood that such a reference is not to be interpreted as there being only one of that element.

[0095] All patents and patent applications referred to in this specification 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. [Brief description of the drawings]

[0096] [Figure 1A] 1 illustrates diagrammatically the definitions of various entities such as TTL and EFL. [Figure 1B] 1 illustrates a schematic diagram of a mobile device including a known collapsed pop-out camera; [Figure 1C] 1C shows a schematic diagram of the mobile device of FIG. 1B with the pop-out camera in a pop-out state; [Figure 2A] 1 illustrates a schematic diagram of a pop-out optical lens system as disclosed herein in a pop-out state. [Figure 2B]2B shows a schematic diagram of the pop-out system of FIG. 2A in a collapsed state; [Diagram 3] 1 illustrates an example of a pop-out optical lens system as disclosed herein. [Figure 4] 1 illustrates another example of a pop-out optical lens system as disclosed herein. [Diagram 5] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 6] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 7] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 8] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 9] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 10] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein. [Figure 11] 1 illustrates yet another example of a pop-out optical lens system as disclosed herein.

Claims

1. 1. A lens system for a compact digital camera, the lens system having a pop-out state and a collapsed state, an image sensor having a sensor diagonal SD; a lens having N≧6 lens elements L1 to LN arranged along a lens optical axis (OA) from an object side toward an image side, starting from L1; Each lens element Li has a respective clear aperture diameter DA Ｌｉ with 1≦i≦N, The lens has a field of view FOV<55 deg, an f / #, and a lens thickness T Ｌｅｎｓ , a back focal length BFL, an effective focal length EFL, and a total track length TTL < 20 mm; The lens system, wherein in the collapsed state, the lens has a collapsed total track length c-TTL, EFL≧10 mm, f / #<2, and a ratio c-TTL / EFL<0.

8.

2. The lens system of claim 1 , wherein the lens system switches from the popped-out state to the collapsed state, or vice versa, by folding a BFL into a collapsed BFL (c-BFL).

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

75.

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

7.

5. c-TTL≦T Ｌｅｎｓ The lens system of claim 1 , wherein the focal length is +1 mm.

6. c-TTL≦T Ｌｅｎｓ The lens system of claim 1 , wherein the focal length is +0.9 mm.

7. c-TTL≦T Ｌｅｎｓ The lens system of claim 1 , wherein the focal length is +0.8 mm.

8. c-TTL≦T Ｌｅｎｓ The lens system of claim 1 , wherein the focal length is +0.7 mm.

9. 2. The lens system of claim 1, wherein 0.9*EFL<TTL<1.1*EFL.

10. 2. The lens system of claim 1, wherein 8 mm<SD<15 mm.

11. 10. The lens system of claim 1, wherein EFL > 12 mm.

12. 10. The lens system of claim 1, wherein EFL≦20 mm.

13. The lens system of claim 1 , wherein TTL<15 mm.

14. 10. The lens system of claim 1, wherein f / #<1.

9.

15. 10. The lens system of claim 1, wherein f / #<1.

8.

16. 10. The lens system of claim 1, wherein f / #<1.

7.

17. T Ｌｅｎｓ 2. The lens system of claim 1, wherein / TTL<0.

75.

18. T Ｌｅｎｓ 2. The lens system of claim 1, wherein / TTL<0.

7.

19. The lens system of claim 1 , wherein BFL>0.3×TTL.

20. 3. The lens system of claim 2, wherein 0.04≦c−BFL / BFL<0.

9.

21. D.A. Ｌ１ / D.A. Ｌ４ >1.15, and D.A. ＬＮ / D.A. Ｌ４ 10. The lens system of claim 1 , wherein:

22. D.A. Ｌ１ / D.A. Ｌ４ >1.25, and D.A. ＬＮ / D.A. Ｌ４ 10. The lens system of claim 1 , wherein:

23. D.A. Ｌ１ / D.A. Ｌ５ >1.25, and D.A. ＬＮ / D.A. Ｌ５ 10. The lens system of claim 1 , wherein:

24. D.A. Ｌ１ / D.A. Ｌ４ >1.35, and D.A. ＬＮ / D.A. Ｌ４ 10. The lens system of claim 1 , wherein:

25. 0.9<DA Ｌ１ / D.A. ＬＮ 2. The lens system of claim 1 , wherein:

26. 2. The lens system of claim 1, wherein the lens has a 35 mm equivalent focal length (35 mm EqFL), where 30 mm<35 mm EqFL<100 mm.

27. 2. The lens system of claim 1, wherein the lens has a 35 mm equivalent focal length (35 mm EqFL), where 40 mm<35 mm EqFL<55 mm.

28. 2. The lens system of claim 1, wherein lens elements L1, L2, L3 and L4 have respective air gaps therebetween along the OA, the air gaps having widths d12, d23 and d34, respectively, each of d12, d23 and d34 being less than 0.5 mm.

29. 2. The lens system of claim 1, wherein lens elements L1, L2, L3 and L4 have respective air gaps therebetween along the OA, the air gaps having widths d12, d23 and d34, respectively, and ratios d12 / TTL, d23 / TTL and d34 / TTL of each of d12, d23 and d34 to the TTL are less than 5%.

30. 13. The lens system of claim 1, wherein the thickness of L2 along the OA is at least 80% greater than the thicknesses of other lens elements along the OA.

31. 2. The lens system of claim 1, wherein the magnitude of the lens power of L1 is less than the magnitude of the lens power of the other lens elements.

32. 2. The lens system of claim 1, wherein an air gap d34 along the OA between L3 and L4 and an air gap d45 along the OA between L4 and L5 are at least 60% larger than other air gaps between lens elements.

33. The lens system of claim 1 , wherein L1 and L2 form a doublet lens.

34. The lens system of claim 1 , wherein L2 and L3 form a doublet lens.

35. The lens system of claim 1 , wherein L4 and L5 form a doublet lens.

36. The lens system of claim 1 , wherein L6 and L7 form a doublet lens.

37. 2. The lens system of claim 1 , wherein L1 and L2, respectively, have thicknesses T1 and T2 along the OA greater than 1 mm, respective refractive indices n1 and n2 less than 1.55, respective Abbe numbers v1 and v2 greater than 50, and respective lens powers are positive.

38. The thickness T2 and T Ｌｅｎｓ The ratio of T2 / T Ｌｅｎｓ The lens system of claim 1 , wherein:

39. 2. The lens system of claim 1, wherein pairs of lens elements L1 and L2, L3 and L4, and L6 and L7 form respective doublet lenses.

40. The lens system of claim 1 , wherein L1 is made of glass and the Abbe number of L1 is greater than 50.

41. 2. The lens system of claim 1, where N=7 and lens elements L1-L7 have a power sequence of plus-minus-plus-minus-plus-minus-minus.

42. 42. The lens system of claim 41, wherein the image-facing rear surface of L1 has a deflection point that is not located at the OA.

43. 43. The lens system of claim 42, wherein lens elements L1, L2, L3, L4 and L5 have respective air gaps therebetween along the OA, the air gaps having widths d12, d23, d34 and d45, respectively, each of d12, d23, d34 and d45 being less than 0.5 mm.

44. 44. The lens system of claim 43, wherein the ratio of each of d12, d23, d34, and d45 to the TTL is less than 5%.

45. L2 is the focal length f ２ and has magnitude |f ２ | is |f ２ 45. The lens system of claim 44, wherein | / EFL<1.

46. L1 is the focal length f １ and has magnitude |f １ | is |f １ 46. ​​The lens system of claim 45, wherein | / EFL<0.

5.

47. 47. The lens system of claim 46, wherein L1 is made of glass and wherein the Abbe number of L1 is greater than 50.

48. 48. The lens system of claim 47, wherein f / #≦1.

9.

49. 2. The lens system of claim 1, where N=7 and lens elements L1-L7 have a power sequence of plus-minus-minus-plus-plus-minus-minus.

50. 50. The lens system of claim 49, wherein the image-facing rear surface of L1 has a deflection point that is not located at the OA.

51. 51. The lens system of claim 50, wherein lens elements L1, L2, L3, L4 and L5 have respective air gaps therebetween along the OA, the air gaps having widths d12, d23, d34 and d45, respectively, each of d12, d23, d34 and d45 being less than 0.5 mm.

52. 52. The lens system of claim 51, wherein the ratio of each of d12, d23, d34, and d45 to the TTL is less than 5%.

53. The air gap d67 between L6 and L7 along the OA is d67 / T Ｌｅｎｓ 53. The lens system of claim 52, wherein: >0.

125.

54. L2 is the focal length f ２ and has magnitude |f ２ | is |f ２ 54. The lens system of claim 53, wherein | / EFL<1.

55. L1 is the focal length f １ and has magnitude |f １ | is |f １ 55. The lens system of claim 54, wherein | / EFL<0.

5.

56. 56. The lens system of claim 55, wherein L1 is made of glass and has an Abbe number greater than 50.

57. L1 is the focal length f １ and has magnitude |f １ | is | f １ 46. ​​The lens system of claim 45, wherein | / EFL<0.

75.

58. 58. The lens system of claim 57, wherein L1 is made of glass and wherein the Abbe number of L1 is greater than 50.

59. 59. The lens system of claim 58, wherein f / #≦1.

9.

60. 2. The lens system of claim 1, where N=6 and lens elements L1-L6 have a power sequence of plus-plus-minus-plus-minus-minus.

61. The thickness T2 of L2 along the OA and the thickness T of the other lens elements ｉ (i = 1, 3, ..., N) ratio T2 / T ｉ 61. The lens system of claim 60, wherein >1.

85.

62. T2 and T Ｌｅｎｓ The ratio of T2 / T Ｌｅｎｓ 62. The lens system of claim 61, wherein:

63. 63. The lens system of claim 62, wherein ratios d12 / TTL and d23 / TTL of an air gap d12 between L1 and L2 and an air gap d23 between L2 and L3, respectively, to the TTL are less than 5%.

64. 64. The lens system of claim 63, wherein the magnitude of the lens power of L1 is less than the magnitude of the lens power of the other lens elements.

65. 65. The lens system of claim 64, wherein L2 and L3 form a doublet lens.

66. 66. The lens system of claim 65, wherein f / #≦1.

9.

67. L2 is the focal length f ２ and has magnitude |f ２ | is | f ２ 67. The lens system of claim 66, wherein | / EFL<0.

75.

68. L3 is the focal length f ３ and has magnitude |f ３ | is | f ３ 68. The lens system of claim 67, wherein | / EFL<1.

69. L1 is the focal length f １ and has magnitude |f １ | is | f １ 69. The lens system of claim 68, wherein | / EFL>10.

70. 70. The lens system of claim 69, wherein L1 is made of glass and wherein the Abbe number of L1 is greater than 50.

71. 71. The lens system of claim 70, wherein L2 is made of glass and wherein the Abbe number of L2 is greater than 50.

72. 2. The lens system of claim 1, wherein N=7 and the power sequence of L1 through L7 is plus-plus-minus-plus-minus-plus-minus.

73. 73. The lens system of claim 72, wherein L6 and L7 form an inverse doublet lens.

74. 74. The lens system of claim 73, wherein L1 and L2 each have a thickness along the OA T1, T2>1 mm, each refractive index n1, n2<1.55, each Abbe number v1, v2>50, and each lens power is positive.

75. 75. The lens system of claim 74, wherein the rear surface of L1 facing the image side has a deflection point that is not located on the OA.

76. The ratio of the thickness T2 of L2 along the OA to the lens thickness is T2 / T Ｌｅｎｓ 76. The lens system of claim 75, wherein:

77. 77. The lens system of claim 76, wherein the image-facing rear surface of L2 has a deflection point that is not located at the OA.

78. 78. The lens system of claim 77, wherein ratios d12 / TTL and d23 / TTL of an air gap d12 between L1 and L2 and an air gap d23 between L2 and L3, respectively, to the TTL are less than 5%.

79. L2 is the focal length f ２ and has magnitude |f ２ | is |f ２ 80. The lens system of claim 78, wherein | / EFL<1.

80. L3 is the focal length f ３ and has magnitude |f ３ | is |f ３ 80. The lens system of claim 79, wherein | / EFL<1.

81. L6 is the focal length f ６ and has magnitude |f ６ | is |f ６ 81. The lens system of claim 80, wherein | / EFL<0.

75.

82. L7 is the focal length f ７ and has magnitude |f ７ | is |f ７ 82. The lens system of claim 81, wherein | / EFL<0.

75.

83. 83. The lens system of claim 82, wherein f / #≦1.

9.

84. 84. The lens system of claim 83, wherein f / #≦1.

8.

85. The ratio of the thickness T2 of L2 along the OA to the lens thickness is T2 / T Ｌｅｎｓ 73. The lens system of claim 72, wherein: >0.

2.

86. T2 / T Ｌｅｎｓ 86. The lens system of claim 85, wherein >0.

3.

87. 87. The lens system of claim 86, wherein the rear surface of L2 has a deflection point that is not located at the OA.

88. 88. The lens system of claim 87, wherein f / #≦1.

9.

89. 90. The lens system of claim 88, wherein each pair of lens elements L1 and L2, L3 and L4, and L6 and L7 form an inverse doublet lens.

90. L1 is the focal length f １ and has magnitude |f １ | is | f １ 90. The lens system of claim 89, wherein | / EFL>50.

91. L6 is the focal length f ６ and has magnitude |f ６ | is | f ６ 91. The lens system of claim 90, wherein | / EFL<1.

92. L7 is the focal length f ７ and has magnitude |f ７ | is | f ７ 92. The lens system of claim 91, wherein | / EFL<1.

93. 88. The lens system of claim 87, wherein ratios d12 / TTL and d34 / TTL of each of an air gap d12 between L1 and L2 and an air gap d34 between L3 and L4 to the TTL are less than 2.5%.

94. 94. The lens system of claim 93, wherein L6 and L7 form an inverse doublet lens.

95. L1 is the focal length f １ and has magnitude |f １ | is |f １ 95. The lens system of claim 94, wherein | / EFL>10.

96. L4 is the focal length f ４ and has magnitude |f ４ | is |f ４ 96. The lens system of claim 95, wherein | / EFL<1.

97. L6 is the focal length f ６ and has magnitude |f ６ | is |f ６ 97. The lens system of claim 96, wherein | / EFL<1.

98. L7 is the focal length f ７ and has magnitude |f ７ | is |f ７ 98. The lens system of claim 97, wherein | / EFL<1.

99. 99. The lens system of claim 98, wherein f / #≦1.

9.

100. 2. The lens system of claim 1, wherein N=7 and the power sequence of L1 through L7 is minus-plus-minus-plus-minus-plus-minus.

101. 101. The lens system of claim 100, wherein each pair of lens elements L1 and L2, L3 and L4, and L6 and L7 form an inverse doublet lens.

102. L1 has a focal length f1 and a magnitude |f １ | is |f １ 102. The lens system of claim 101, wherein | / EFL>10.

103. Each of the lens elements L1 to L7 has a focal length f １ ~f ７ and each of the focal lengths has a magnitude |f １ |~|f ７ | is | f １ | / EFL~|f ７ 103. The lens system of claim 102, wherein | / EFL>1.

104. 104. The lens system of claim 103, wherein f / #≦1.

9.

105. 2. The lens system of claim 1, wherein N=7 and the power sequence of L1 through L7 is plus-minus-plus-plus-minus-minus-minus.

106. 106. The lens system of claim 105, wherein f / #≦1.

8.

107. 107. The lens system of claim 106, wherein f / #≦1.

7.

108. 108. The lens system of claim 107, wherein f / #≦1.

65.

109. 109. The lens system of claim 108, wherein L1 is the thickest lens element in the lens and has a thickness T1, L3 is the second thickest lens element in the lens and has a thickness T3, and L6 is the third thickest lens element in the lens and has a thickness T6, all lens thicknesses measured along the OA, T1 / T6>3 and T3 / T6>3.

110. D.A. Ｌ１ / D.A. Ｌ５ >1.75, and D.A. Ｌ１ / D.A. ＬＮ 110. The lens system of claim 109, wherein: < 1.

6.

111. D.A. Ｌ１ 111. The lens system of claim 110, wherein the distance is ≧7.5 mm.

112. 112. The lens system of claim 111, wherein L2 and L3 form an inverse doublet lens, and L4 and L5 form a doublet lens.

113. L1 is the focal length f １ and has magnitude |f １ | is |f １ 113. The lens system of claim 112, wherein | / EFL<1.

114. L6 is the focal length f ６ and has magnitude |f ６ | is |f ６ The lens system of claim 113, wherein | / EFL>100.

115. L7 is the focal length f ７ and has magnitude |f ７ | is |f ７ The lens system of claim 114, wherein | / EFL>20.

116. The lens system of any one of claims 1 to 115, wherein the lens system is incorporated into a camera module, the camera module being incorporated into a smartphone.

117. 116. The lens system of claim 115, wherein the smartphone has a back surface and the OA is oriented perpendicular to the back surface.

Images