Refraction and hybrid lens for small bent telephoto camera

Abstract

A flexural digital camera for mobile devices such as smartphones includes a lens having N > = 4 lens elements, an effective focal length (EFL), and f number f / #, an optical path flexing element (OPFE), and an image sensor having a sensor diagonal length SD. Some of the lenses may be super lenses or include super lens elements. In some cameras, a lens is located on the object side of the OPFE, 8 mmlt; eFLlt, EFLlt; 50 mm, SD / EFLgt; 0.4, f / # lt; and 2.75%. In some cameras, M is greater than or equal to 1 of the lens elements, the lens elements are super-lens elements, and O is equal to NM of the lens elements, the lens elements are refractive lenses, 8 mlt; eFLlt, EFLlt; 40 mm, SD / EFLgt; and 0.3.

Description

[0001] This application is a divisional application of patent application No. 202380061900.4, filed on December 10, 2023, entitled "Refractive and Hybrid Lens for Small Bending Telephoto Camera". Cross-references to related applications

[0002] This application relates to and claims priority to U.S. Provisional Patent Application No. 63 / 386,912, filed December 11, 2022; U.S. Provisional Patent Application No. 63 / 476,406, filed December 21, 2022; U.S. Provisional Patent Application No. 63 / 495,141, filed April 10, 2023; and U.S. Provisional Patent Application No. 63 / 543,309, filed October 10, 2023, all of which are incorporated herein by reference in their entirety. Technical Field

[0003] The topics currently being discussed are generally related to the field of digital cameras.

[0004] definition In this application, and in relation to the optical and other properties mentioned in the specification and drawings, the following symbols and abbreviations are used, all of which are terms known in the art: 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 to infinity.

[0005] Back focal length (BFL): The length of the last lens element (L) measured along an axis parallel to the lens optical axis when the system is focused to infinity. N The rear surface S 2N The minimum distance between a point and the image sensor.

[0006] Effective focal length (EFL): In a lens (lens elements L1 to L... N In the components of the lens, the distance between the rear principal point P' and the rear focal point F'.

[0007] f-number (f / #): The ratio of the lens's EFL to its entrance pupil diameter (or "aperture diameter" or "DA"). Background Technology

[0008] Multi-aperture cameras (or "multi-camera systems," such as a "dual-camera system" with two cameras) are standard on today's portable handheld mobile devices ("mobile devices," such as smartphones, tablets, head-mounted displays, etc.). Multi-camera systems are compact, meaning they are relatively low in height (or thickness), width, and length, which is advantageous for use in small mobile devices. Multi-camera systems typically include a wide field-of-view (FOV). W A camera ("W" camera), and including at least one other camera, such as one that has (compared to FOV) W Narrower FOV (with FOV) T Telephoto lenses or telephoto cameras, or FOVs with an ultra-wide field of view. UW (Compared to FOV) W Wider, "UW" camera).

[0009] Figure 1A An example of a known folding telephoto camera 100 is schematically shown. Camera 100 includes a lens 102, an optical path folding element (OPFE) 104 (e.g., a prism or mirror), and an image sensor 106. OPFE 104 folds a first optical path (“OP1”) 108 to a second OP2 110. Light from the scene passes through lens 102, is reflected by OPFE 104, and illuminates image sensor 106. Here and below, “height” (e.g., the height H of lens 102) is used. L Or the height H of the image sensor 106 S (As shown in the figure) is measured along an axis parallel to OP1108, and the "length" (e.g., the length L of lens 102) is measured along an axis parallel to OP1108. L As shown in the figure, the measurement is taken along an axis parallel to OP2110. Lens 102 includes multiple (N) lens elements (here: N=4), numbered L1-L. N Lens 102 is located on the object side of the OPFE and has a lens optical axis (“OA”) parallel to OP1108 and a lens height (or lens thickness) H. L And lens length (or lens width) L L ΔLO indicates the distance between lens 102 and OPFE 104. OPFE The length of OPFE104 along the z-axis is indicated. OPFE104 can be at a 45-degree angle relative to OP1 and OP2, therefore the height H of OPFE104 is... OPFE H can be derived OPFE =L OPFEThe TTL and BFL of camera 100 are respectively TTL1 and TTL2, and BFL1 and BFL2. TTL1 and BFL1 are parallel to OP1108, and TTL2 and BFL2 are parallel to OP2110. TTL = TTL1 + TTL2 and BFL = BFL1 + BFL2. The aperture of camera 100 is numbered 112 and has an aperture diameter (“DA”). For example, such a known bent telephoto camera is disclosed in PCT / IB2022 / 055745, the entire contents of which are included herein. In all examples disclosed herein, the f / # of the camera (e.g., camera 100) is given by f / # = EFL / DA.

[0010] The length of the camera module (including the camera, such as camera 100) (“minimum module length” or “ML”) has been shown. M ) and its first height (“minimum module height” or “MH”) M ) and its second height ("minimum shoulder height" or "MH") S " <MH M The theoretical limit of ML. M MH S and MH M Defined by the minimum dimensions of the components contained in camera 100. The camera module includes a housing 114. The housing 114 defines the size (or dimensions) of the camera module. The camera module has a height of H. M Module area 116 and height H S <H M The shoulder area is 118.

[0011] To estimate the theoretical limit of the minimum size of the camera module containing the optical lens system described herein, we introduce the following parameters and correlations. It should be noted that, in contrast to the "theoretical limit" defined above, parameters such as "module length," "module height," and "shoulder height" define the dimensions of the camera module as defined by the housing (e.g., housing 114).

[0012] ML M and "module length" ("L M ”） - Minimum Module Length (ML) M "" represents the theoretical limit of the length of the camera module, which includes all components of camera 100.

[0013] - ML M =Z Lens Z Sensor Z Lens It is the maximum z-value of lens 102, ZSensor is the minimum z value of the image sensor 106. In other words, measured along the OP2 110, ML M represents the maximum distance between any part of the lens 102 to any part of the image sensor 106.

[0014] To make a practical estimate of the camera module length (“L M ”), one can add, for example, 3.5 mm to the ML M , i.e. L M = ML M + 3.5 mm. The extra length accounts for the lens travel that can be needed for optical image stabilization (OIS) and for image sensor packaging, housing, etc. In other examples, one can add +5 mm, or +2.5 mm, or even +2 mm.

[0015] Minimum module area length MRL M - MRL M is the theoretical module region length limit of the module region 116 of height H M . MRL M is defined by the lens 102 contained in the module region 116, i.e. MRL M = L L .

[0016] Minimum shoulder length MRL S and "module length" ("L S ”） - MRL S is the theoretical module region length limit of the shoulder region 118 of height H S < H M . MRL S is defined by the image sensor 106 contained in the shoulder region 118.

[0017] - MRL S = ML M MRL M .

[0018] - In general, for a given ML M , it can be beneficial from an industrial design point of view to maximize MRL S (minimize MRL M ) because it can minimize BL Figure 1B .

[0019] - To make a practical estimate of L S , one can add, for example, 3.5 mm to the MRL SIncrease the length by 2.5mm, i.e., L S =MRL S +2.5mm. In other examples, it could be +5mm, or +2mm, or even +1.5mm.

[0020] MH M and "module height" ("H M ”） - MH M This is the theoretical limit of the module region's height of 116.

[0021] - MH M The value is given by the difference between the lowest y-value occupied by image sensor 106 and the highest y-value occupied by lens 102. In other words, MH is measured along OP1108. M This represents the maximum distance from any part of the lens 102 to any part of the image sensor 106.

[0022] - In order to practically estimate H M For example, it can be found in MH M Add an extra 1.5mm of height, i.e., H M =MH M +1.5mm. The extra length takes into account the housing, lens cap, etc. In other examples, it could be +3mm, or +1mm, or even +0.5mm.

[0023] Minimum shoulder height ("MH S ") and "shoulder height" ("H S ”） - MH S This is the theoretical limit of a 118cm height in the shoulder area. In some examples, MH... S It can be entirely determined by the height H of the image sensor 106 Sensor Confirmed, i.e., MH S =H Sensor .

[0024] - The aspect ratio of the image sensor 106 can be 4:3, therefore the total sensor diagonal length (SD) is SD = 5 / 3. H Sensor Provided.

[0025] - H S Through MH S The estimate is based on adding, for example, an additional 1.5mm of height, i.e., H. S =MH S+1.5mm. The additional height accounts for the contact sensor 106 and the housing. In other examples, it can be +3mm, or +1mm, or even +0.5mm.

[0026] Figure 1B A cross-sectional view of a mobile device 120 (e.g., a smartphone) including a known folded tele camera 100 is shown schematically. The aperture 112 of the camera 100 is located at the back surface (or "world-facing" surface) 122 and points towards a scene, the front surface (or "user-facing" surface) 124 is opposite the surface 122, which can include a screen (not shown), for example. The mobile device 120 can include a processor, such as an application processor ("AP"). The processor can be used to process image data captured by a Wide camera, a Tele camera, and / or a UW camera included in the mobile device. The mobile device 120 has a regular region 126 (of thickness ("T")) and a camera bump region 128 that is raised above the regular region 126 by a bump height B. The bump region 128 has a bump length ("BL") and a bump thickness T+B. As shown, the module region 116 can be integrated into the bump region 128, and the shoulder region 118 can be integrated into the regular region 126. For industrial design considerations, it is desirable to have a small camera bump (i.e., a short BL) and a thin camera bump (i.e., a low B). The camera 100 is only partially integrated into the bump region, so the BL is relatively short. In general, it is beneficial for a slim mobile device to minimize MH M and MH S It is especially meaningful to minimize MH M because it can minimize B. It is also beneficial to minimize ML M for a small camera. It is especially meaningful to minimize MRL M because it can minimize BL. B Min is the theoretical minimum value of the height B of the camera bump region 128, given by B Min = H M T gives.

[0027] Figure 1CAn example of a folded long focus camera disclosed herein is shown schematically and numbered 130. Camera 130 includes a lens 132 having a plurality (N) of lens elements (here N=4) numbered LI-L4, with LI facing the object side. Camera 130 also includes an OPFE 134 that can fold a first optical path OP1 138 to a second optical path OP2 140, and an image sensor 136. As shown, the camera can be included in a housing 142. In camera 130, OP1 138 is substantially parallel to the y-axis and the lens OA. OP2 140 is oriented perpendicular to the image sensor 136. OP2 140 makes an angle a with the z-axis, so OP2 140 is referred to as a "tilted OP". OPFE 134 makes an angle β with the y-axis that is > 45 degrees, and an angle 90-β with the z-axis that is < 45 degrees. As for the slope of OP1 140, BFL2 and TTL2 have components measured along the y-axis ("TTL2 y ", "BFL2 y ") and along the z-axis ("TTL2 z ", "BFL2 z ", respectively), so BFL2 = sqrt(BFL2 y 2 +BFL2 z 2 ) and TTL2 = sqrt(TTL2 y 2 +TTL2 z 2 ). As for the tilted OP, sensor 136 makes an angle of 2x(β 45) with the y-axis.

[0028] The advantages of this camera with a tilted OP are: 1. A large image sensor can be employed, such as 1 / 2.5" or larger. A large image sensor is advantageous for capturing a relatively large amount of light.

[0029] 2. A low f / #. A low f / # is advantageous for capturing a relatively large amount of light, and for imaging with a relatively high spatial (or pixel) resolution.

[0030] 3. The module size is smaller, i.e. MH M and ML M can be smaller than for a camera with a non-tilted OP (assuming the same EFL, lens aperture, and image sensor size for the cameras with the tilted and non-tilted OP, respectively).

[0031] Figure 1D A cross-sectional view of another mobile device 150 is shown schematically and numbered, with dimensions and components as in Figure 1B and Figure 1CThe, including the folded tele camera 130. The camera 130 is fully integrated in the camera bump region 128. The lens elements of the lens 132 can be carried by a lens barrel.

[0032] In other examples, as shown with respect to the folded tele camera 100, the housing of the folded tele camera, e.g., the folded tele camera 130, can have (or can be divided into) a module region having a module region height H M and a shoulder region having a shoulder region height H S <H M Such a folded tele camera can be included in a mobile device, as shown with respect to the mobile device 120. That is, the shoulder region can be included in a regular region of the mobile device, while the module region can be included in a camera bump region of the mobile device.

[0033] An advantage of the cameras 100 and 130 is that, for a given H M (or a given bump thickness T + B), a relatively large aperture diameter (“DA”) can be achieved, resulting in a relatively low f / #. This is because the optical power of the lenses 102 and 132 respectively converges the light rays before they impinge on the OPFEs 104 and 134. By “converges” is meant that a first circle, perpendicular to the optical axis of the lens and including all of the light rays that form an image on the image sensor (which is on the object side of the lens), is larger than a second circle, perpendicular to the optical axis of the lens and including all of the light rays that form an image on the image sensor (which is on the image side of the lens and the object side of the OPFE). The H M (and B) of the cameras 100 and 130 is limited by H L , i.e., to reduce H M , H L must be reduced.

[0034] It is known that the addition of a conventional diffractive lens (CDL) in a “regular” (or “refractive”) lens can significantly reduce the lens height (e.g., H L). The same is true for the weight of the lens. Regular lenses here refer to lenses that include multiple (N) refractive lens elements, all made of glass and / or plastic. When one or more CDLs or diffractive lenses are introduced in a regular lens, we refer to a “hybrid” lens. For example, Canon describes the function of CDLs in the correction of chromatic aberration in hybrid lenses in the article “Multilayer diffractive optical element and its application to camera lenses” (T. Nakai and H. Ogawa, Diffractive Optics and Micro-Optics, R. Magnusson, Ed., Vol. 75 of the series Trends in Optics and Photonics in Optics and Photonics (Optica Publishing Group, 2002), paper DMA2.). Plastic and glass lenses produce positive chromatic aberration, i.e. the refraction of blue light is stronger than that of red light. In contrast, CDLs exhibit negative chromatic aberration, i.e. the refraction of red light is stronger than that of blue light. Combining these properties in a hybrid lens allows for efficient and delicate correction of chromatic aberration, thereby reducing H L , while still supporting a given set of lens parameters such as EFL, TTL, f / #, etc. As mentioned above, in the camera 100, a lower H L , can be achieved. M , thereby making the camera module more slim. Recently, significant progress has been made in the field of metalenses (metalenses, “MLs”). See the article “Advantages of metalenses over diffractive lenses” by J. Engelberg and U. Levy, Nat Commun 11, 1991 (2020). A ML is formed by manufacturing specific nanostructures on a first surface of a substrate. That is, the ML is only located on the first surface of the substrate. In a ML, the phase is generated by the response of light to the nanostructures. The difference between a ML and a CDL is that the structure size is smaller. If it contains a subwavelength quasi-periodic structure, it is called a metalens; if it contains a superwavelength quasi-periodic structure, it is called a CDL. A ML has many properties of a DOE, i.e. the property of showing negative chromatic aberration. Therefore, it can be reasonably assumed that the H L of a hybrid lens that includes a refractive plastic (and / or glass) lens and one or more MLs can be much lower than the H L of a regular lens that includes only refractive lenses.

[0035] It is advantageous to have a slim regular lens and a hybrid lens consisting of a plastic (and / or glass) lens and one or more MLs, which helps to achieve a slim mobile camera. Such slim regular lenses and hybrid lenses are disclosed herein. SUMMARY

[0036] In various exemplary embodiments, a camera is provided, comprising: a lens having a lens optical axis OA, N ≥ 4 lens elements L i , an effective focal length EFL, a diameter of aperture DA, a f-number f / #, a total lens length TTL and a back focal length BFL, each lens element having a respective focal length f i , a first lens element L1 facing towards the object side, a last lens element L N facing towards the image side; an image sensor having a full sensor diagonal length SD; and an optical path folding element OPFE for providing a folded optical path between an object and the image sensor, wherein the camera is a folded digital camera, wherein the lens is located on the object side of the OPFE, wherein the EFL is in the range of 8 mm < EFL < 50 mm, wherein SD / EFL > 0.4, wherein f / # < 2.75.

[0037] In some examples, f / # < 2.7. In some examples, f / # < 2.6. In some examples, f / # < 2.5.

[0038] In some examples, the OPFE is oriented at an angle β with respect to the lens OA, wherein 45 < β ≤ 65 degrees. In some examples, 45 < β ≤ 60 degrees. In some examples, 45 < β ≤ 55 degrees. In some examples, 46 < β ≤ 50 degrees.

[0039] In some examples, SD / EFL > 0.5.

[0040] In some examples, the camera is comprised in a camera module having a module height H M , wherein SD / H M > 0.7.

[0041] In some examples, the camera is comprised in a camera module having a module height H M , wherein SD / H M > 0.75.

[0042] In some examples, N = 4, the power sequence of the lens elements L1-L4 is positive-negative-positive-positive.

[0043] In some examples, each lens element L i has a lens element thickness T i and a minimum lens element radius (D / 2) i , and for each of L2, L3 and L4, the ratio T i / (D / 2) i < 0.25. In some examples, for each of L2 and L3, the ratio T i / (D / 2) i<0.2.

[0044] In some examples, the camera has a stop located on the image side of the lens.

[0045] In some examples, the lens has a lens height H L , all pairs of consecutive lens elements have a nearest gap G of less than 0.2mm, and all pairs of consecutive lens elements satisfy the ratio G / H L <5%. In some examples, G / H L <2.5%.

[0046] In some examples, the largest G is between L3 and L4.

[0047] In some examples, the lens has a lens height H L , the distance (d L1-L3 ) between L1 and L3 satisfies d L1-L3 <0.75mm, and the ratio d L1-L3 / H L <0.2. In some examples, d L1-L3 / H L <0.15.

[0048] In some examples, TTL / EFL < 1.05.

[0049] In some examples, the lens has a lens height H L measured along OP1, and the ratio satisfies H L / TTL < 0.4. In some examples, / TTL < 0.35.

[0050] In some examples, BFL / TTL > 0.5.

[0051] In some examples, S8 is the image side surface of L4, has a lens element surface diameter D8, and the ratio of DA to D8 satisfies DA / D8 > 1.3. In some examples, DA / D8 > 1.4.

[0052] In some examples, both the front surface of L3 and the back surface of L3 are concave towards the object side.

[0053] In some examples, both the front surface of L4 and the back surface of L4 are convex towards the object side.

[0054] In some examples, both the front surface of L3 and the back surface of L3 contain 2 inflection points.

[0055] In some examples, 5mm < DA < 8mm.

[0056] In some examples, 10mm < EFL < 20mm.

[0057] In some examples, 5mm < SD < 10mm.

[0058] In some examples, all lens elements are made of plastic.

[0059] In some examples, the camera is contained in a camera module having a module height H M In some examples, 7.5mm < H M < 15mm. In some examples, 9mm < H M < 12mm.

[0060] In some examples, the lens is a cut lens, which is cut along an axis parallel to the lens optical axis. In some examples, the lens is cut by 20% relative to the axial symmetric lens diameter, H M The reduction due to the cut is > 7.5%.

[0061] In various exemplary embodiments, a camera is provided, comprising: a lens having N > 4 lens elements L i and having a lens height H L , an effective focal length EFL and a lens total length TTL, each lens element having a respective focal length f i , and the first lens element L1 facing towards the object side, the last lens element L N facing towards the image side; an image sensor having a full sensor diagonal length SD; and an optical path folding element OPFE for folding a first optical path OP1 to a second optical path OP2 perpendicular to OP1, wherein the camera is a folded camera, wherein the lens is located on the object side of the OPFE and has a lens optical axis parallel to OP1, wherein EFL is in the range of 8mm < EFL < 40mm, wherein M > 1 lens elements are superlenses, O = N M lens elements are refractive lenses, and wherein SD / EFL > 0.3.

[0062] In some examples, SD / EFL > 0.35. In some examples, SD / EFL > 0.4.

[0063] In some examples, H L / TTL < 20%.

[0064] In some examples, M = 1, the single superlens has a positive focal length f M , and f M / EFL > 7.5. In some examples with M = 1 and f M positive, f M / EFL > 15. In some examples with M = 1 and f M positive, f M / EFL > 30. In some examples with M = 1 and fM In examples where f is positive, 7.5 < f M / EFL < 100. In some examples where M = 1 and f M In examples where f is positive, 10 < f M / EFL < 50.

[0065] In some examples where M = 1, 100 mm < f M < 1500 mm. In some examples where M = 1, 200 mm < f M < 1000 mm.

[0066] In some examples where M = 1, the single meta-lens element includes L2. In some examples where M = 1, the single meta-lens element includes L4.

[0067] In some examples, M = 2, the two meta-lens elements are L2 and L4, the focal length of L2 is f M1 , the focal length of L4 is f M2 , and f M1 and f M2 are both positive. In some such examples, 7.5 < f M1 / EFL and f M2 / EFL < 100. In some such examples, 10 < f M1 / EFL and f M2 / EFL < 50. In some such examples, f M1 and f M2 are both in the range 100 mm < f M1 , f M2 < 1500 mm. In some such examples, f M1 and f M2 are both in the range 200 mm < f M1 , f M2 < 1000 mm. In some examples, 0.25 < f M1 / f M2 < 1.

[0068] In some examples, all of the refractive lenses are plastic lenses.

[0069] In some examples, each of the M meta-lenses is located on the object side of a substrate having a height H Substrate satisfying 0.1 mm < H Substrate < 1 mm, and the substrate is made of glass.

[0070] In some examples, each of the M meta-lenses is located on the object side of a substrate having a height H Substrate satisfying 0.15 mm < H Substrate < 0.75 mm, and the substrate is made of glass.

[0071] In some examples, N = 4, the power sequence of the lens elements L1-L4 is positive-negative-negative-positive. In some examples, N = 4, f3 is negative with an amplitude |f3| < EFL / 2.5. In some examples, N = 4, f3 is negative with an amplitude |f3| < EFL / 5.

[0072] In some examples, f1 is positive and f1 < EFL / 2. In some examples, f1 is positive and f1 < EFL / 1.5.

[0073] In some examples, N = 4, the power sequence of the lens elements L1-L4 is positive-negative-negative-positive.

[0074] In some examples, N = 5, the power sequence of the lens elements L1-L5 is positive-positive-negative-positive-positive.

[0075] In some examples, 10 mm < EFL < 30 mm. In some examples, 12.5 mm < EFL < 27.5 mm.

[0076] In some examples, TTL / EFL < 1.05. In some examples, TTL / EFL < 1.0.

[0077] In some examples, BFL / TTL > 0.75. In some examples, BFL / TTL > 0.8.

[0078] In some examples, 4 mm < SD < 15 mm. In some examples, SD > 6 mm. In some examples, SD > 9 mm.

[0079] In some examples, 4 mm < DA < 11 mm, 2 < f / # < 6.5. In some examples, 6 mm < DA < 9 mm, 3 < f / # < 5.

[0080] In some examples, f / # < 4.0.

[0081] In some examples, the OPFE is a mirror.

[0082] In some examples, the camera is included in a camera module, which has a module height H M In some examples, 7.5 mm < H M < 15 mm. In some examples, 9 mm < H M < 13.5 mm.

[0083] In some examples, the camera is included in a camera module, which has a module length L M , L M < EFL.

[0084] In some examples, the lens and OPFE are contained in the module area, and the image sensor is contained in the shoulder area.

[0085] In some examples, the camera is contained within the mobile device. In some examples, the mobile device is a smartphone.

[0086] In some examples, a mobile device is provided that includes any of the aforementioned cameras, the mobile device having a device thickness T and a camera protrusion height B, the camera protrusion area having a height T+B, and the camera being completely contained within the camera protrusion.

[0087] In some examples, the aforementioned camera is contained within a camera module having a first module region and a second shoulder region, the first module region having a module region height H. M The second shoulder region has a shoulder region height H S H M >H S In some examples, DA>H S 3mm. In some examples, DA>H S 2mm. In some examples, DA>H S 1mm. Attached Figure Description

[0088] Referring to the accompanying drawings listed later in this paragraph, non-limiting examples of the embodiments disclosed herein will be described below. The drawings and description are intended to illustrate and clarify the examples disclosed herein and should not be construed as making any limitations.

[0089] Figure 1A It shows a known bent telephoto camera; Figure 1B A known mobile device is schematically shown, which has an outer surface and includes... Figure 1A The known bent telephoto camera; Figure 1C It shows another known folding telephoto camera; Figure 1D The diagram schematically illustrates another known mobile device, which has an outer surface and includes... Figure 1C The known bent telephoto camera; Figure 2A An example of the folded telephoto camera refractive lens optical system disclosed herein is shown; Figure 2B Another example of the folded telephoto camera refractive lens optical system disclosed herein is shown; Figure 3An example of a folded tele camera hybrid lens optical system disclosed herein is shown. Figure 4 Another example of a folded tele camera hybrid lens optical system disclosed herein is shown. Figure 5 Yet another example of a folded tele camera hybrid lens optical system disclosed herein is shown. Figure 6 Yet another example of a folded tele camera hybrid lens optical system disclosed herein is shown. Figure 7 Yet another example of a folded tele camera hybrid lens optical system disclosed herein is shown. Figure 8 Yet another example of a folded tele camera hybrid lens optical system disclosed herein is shown. DETAILED DESCRIPTION

[0090] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the current disclosure. However, it will be apparent to one skilled in the art that the presently disclosed subject matter can be practiced without these specific details. In other instances, well-known methods and features have not been described in detail so as not to obscure the current disclosure.

[0091] All optical lens systems disclosed below can be used in (or integrated in) known folded cameras (e.g., folded camera 100 or folded camera 130), and the resulting cameras can be used in mobile devices (e.g., mobile device 120 or mobile device 150). It is clarified that all examples of optical lens systems disclosed herein are advantageous for application in smartphones, tablets, and the like. Table 1 lists numerical values and dimensions of cameras and mobile devices that include the optical lens systems disclosed herein. Table 1 uses Figure 1A - definitions and explanations given in -D.

[0092] - “N” denotes the number of lens elements of the lens.

[0093] - “M” denotes the number of metasurface elements of the lens.

[0094] - “ML position” denotes the position of the metasurface included in the lens.

[0095] - “f M1 ” denotes the focal length (in mm) of the first metasurface element included in the lens.

[0096] - “f M2 ” denotes the focal length (in mm) of the second metasurface element included in the lens.

[0097] - "Type" indicates whether the optical lens system is a regular lens (comprising only glass and / or plastic lens elements) or a hybrid lens (comprising glass and / or plastic lens elements and additionally at least one superlens element).

[0098] - SD is the (full) sensor diagonal length of the image sensor (in mm).

[0099] - "35mm EqFL" indicates the 35mm equivalent focal length of the optical system.

[0100] - "DA" indicates the aperture diameter (in mm).

[0101] - The unit of the (diagonal) field of view ("FOV") is degree.

[0102] - "H L " indicates the lens height (or thickness) as defined in Figure 1A and Figure 1C (in mm). H L (200) refers to the (reference) lens height of example 200. H L = TTL1 BFL1.

[0103] - MH M , MH S , ML M , H M , H S , and L M are defined as above, in mm.

[0104]

[0105] Table 1 Figure 2A An example of an optical lens system disclosed herein is shown, numbered 200. The optical lens system 200 comprises a regular (or "refractive") lens, i.e. a lens that does not comprise a superlens. The optical lens system 200 comprises a lens 202 having a plurality (N) of lens elements (here N = 4), numbered LI - L4, LI facing the object side. The optical lens system 200 further comprises an OPFE 204 (which bends a first OP 208 to a second OP 210), an image sensor 206, and (optionally) an optical element 212 (e.g. an IR filter). In the optical lens system 200, OP 208 is substantially parallel to the y-axis, and OP 210 is substantially parallel to the z-axis. The lens optical axis of lens 202 is oriented parallel to OP 208. OPFE 204 is at a 45 degree angle to both the y-axis and the z-axis. Here, OPFE 204 is a mirror.

[0106] The lens 202 is located on the object side of the OPFE 204. The TTL and BFL of the camera 200 are oriented along two axes. The first portion TTL1 and BFL1 are parallel to the OP 208, and the second portion TTL2 and BFL2 are parallel to the OP 210, respectively. The TTL and BFL are derived from TTL = TTL1 + TTL2 and BFL = BFL1 + BFL2, respectively, where TTL2 = BFL2. The lens height H L of the lens 202 is given by H L = TTL1 BFL1. The light rays pass through the lens 202, are reflected by the mirror 204, and form an image on the image sensor 206. FIG. 2 shows 3 fields, each with 6 light rays. This applies to all other optical lens systems disclosed herein as well.

[0107] It is noted that the value of MH M depends on (i) the position (or location) of the OPFE 204 relative to the y-axis and (ii) the amount of light rays entering the camera 200. For (i), the position of the OPFE 204 is changed by increasing or decreasing DLO. Here, DLO = 0.65 mm, so MH M = 11.2 mm. In other examples, DLO can be in the range of DLO = 0.05 mm - 2 mm, so MH M = 10.6 mm - 12.55 mm. Since the TTL does not change, the ML M will change accordingly. For (ii), the height of the mirror 204 can be defined such that it includes all on-axis light, i.e., the mirror 204 can have a lower limit labeled “on-axis”. In other examples, the height of the mirror 204 can be defined such that it also includes all off-axis light, i.e., the mirror 204 can have a lower limit labeled “off-axis”. In the image sensor 206, SD = 10.2 mm. This is relatively large compared to commonly used image sensors (e.g., an image sensor with SD = 5.3 mm, a 1 / 3” image sensor). Large image sensors are advantageous for achieving high image quality. For a given EFL and a given H M , all optical lens systems disclosed herein employ a relatively large image sensor. That is, all optical lens systems disclosed herein achieve a relatively large SD / EFL and SD / H M ratio, e.g., SD / EFL > 0.4, SD / H M > 0.75. In the optical lens system 200, EFL = 23.5 mm. In the optical lens system 250, EFL = 15.2 mm. In other examples, the EFL can be in the range of 8 mm < EFL < 50 mm.

[0108] The lens 202 comprises a plurality (N) of lens elements L i (where "i" is an integer between 1 and N). Li is the lens element closest to the object side, L N 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. The N lens elements are axially symmetric along an optical axis (lens axis) parallel to OP 208. Each lens element L i comprises a respective front surface S 2i-1 (index "2i-1" is the number of the front surface) and a respective back surface S 2i (index "2i" is the number of the back surface), where "i" is an integer between 1 and N. This numbering convention is used throughout this specification. Alternatively, in the specification, the lens surfaces are labeled as "S k ", k is between 1 and 2N. The front and back surfaces can in some cases be aspherical. However, this is not a limitation.

[0109] As used herein, the term "front surface" of each lens element refers to the surface of the lens element closest to the camera entrance (object side of the camera), and the term "back surface" refers to the surface of the lens element closest to the image sensor (image side of the camera).

[0110] Detailed optical data and surface data for lens element examples in Figure 2A are listed in Table 2-3. The numerical values provided for these examples are for illustration purposes only, and other numerical values can be used for other examples.

[0111] Surface types are defined in Table 2. Coefficients for the surfaces are defined in Table 3. The surface types are: a) Plano: flat surface, no curvature b) Q-type 1 (QT1) surface concave formula:

[0112]

[0113]

[0114]

[0115]

[0116]

[0117]

[0118] c) Even Asphere (ASP) surface concave formula:

[0119] where {z, r} are standard cylindrical polar coordinates, c is the quasi-axial curvature of the surface, k is the conic coefficient, r norm is typically half of the surface’s clear aperture (A n are the polynomial coefficients shown in the lens data table. The z-axis is positive towards the direction of the image. The value of CA is expressed by the effective aperture radius, i.e. CA / 2. The reference wavelength is 555.0 nm. Units are in mm except for the refractive index (“Index”) and Abbe #. Table 2 gives the focal length f i of each lens element L i . FOV is expressed by the half field of view (HFOV). The definitions of surface type, z-axis, CA value, reference wavelength, units, focal length, and HFOV apply to Tables 4-23.

[0120]

[0121] Table 2

[0122] Table 3

[0123] Table 3 (continued) It is noted that in the present document, the optical lens system 200 is shown as a “folded optical lens system”, i.e. the shown optical lens system 200 comprises an OPFE 204 and two mutually perpendicular optical paths, i.e. OP 208 and OP 210. The hybrid lens systems 300, 400, 500, 600, 700, and 800 disclosed in the present document are not shown as folded optical lens systems, i.e. they do not show a respective OPFE and do not show two mutually perpendicular optical paths. However, it is also noted that all hybrid optical lens systems disclosed in the present document are advantageous for use as folded optical lens systems. The numerical values and dimensions of all hybrid optical lens systems disclosed in the present document are derived with reference to the optical lens system 200. For example, in order to estimate the HFOV of the optical lens systems 300, 400, 500, 600, 700, and 800, we assume that the BFL1 (relative to the optical lens system 200) remains unchanged, and thus the lower HFOV M of the optical lens systems 300, 400, 500, 600, 700, and 800 translates into a lower HFOV L , which is advantageous for slim mobile devices. Since the TTL remains unchanged, the lower HFOV M of the optical lens systems 300, 400, 500, 600, 700, and 800 translates into a lower HFOV LBased on the same quantity, convert to a larger ML M .

[0124] In some examples, lens 202 can be cut to obtain a cut lens based on lens 202. Cutting the lens can be achieved by cutting 10%–40% of the width or length of the lens element of lens 202. The width or length cut is made in a direction parallel to the optical axis of the lens (i.e., parallel to the y-axis), therefore the width of lens 202 measured in the x-direction (“W”) is... L The length of lens 202 measured along the y-direction is less than ("L") L ), that is, W L <L L Cutting lens 202 can significantly save MH. M This is beneficial for the design of slim mobile devices. For example, by reducing the lens 202 by 20%, H M and MH M It can reduce it by 10–20%.

[0125] OPFE204 forms a 45-degree angle with both the y-axis and z-axis. In other examples, OPFE204 can form a tilt angle in the range of 45 < β ≤ 65 degrees relative to the y-axis (i.e., relative to OP208).

[0126] The thickness of each lens element in L2, L3, and L4 is relatively small; that is, for each of L2, L3, and L4, T i The minimum lens element radius (D / 2) between the two lens element surfaces. i The ratio satisfies T i / (D / 2) i <0.3. For L3, the ratio satisfies T i / (D / 2) i <0.25. T i The measurement was taken at position OP208. The image-side surface of L4 is S8. The diameter D8 of S8 is relatively small, and the ratio of D8 to DA satisfies DA / D8 = 1.42. L2 is a crescent-shaped convex surface formed towards the object side, meaning that both the front and rear surfaces of L2 are convex towards the object side. L1 is relatively thin, meaning that the thickness T1 of L1 is proportional to the lens height H. L Satisfying the ratio T1 / H L <0.3. Here, T1 / H L =0.23. L1, L2, and L2, L3 are very close to each other. Here and below, if a pair of consecutive lens elements L i and L i+1 The nearest gap (or distance) between them measured along the y-axis, "G" i "Satisfies, at optical axis 208 and L" i or L i+1between the diameters radii of L1 and L2, at a certain position along the z-axis, G i <0.2mm, L1 and L2 are considered to be “in close proximity to each other”. i and L i+1 “in close proximity to each other”. G1=0.037mm (between L1 and L2) is on the optical axis 208, G2 is not on the optical axis 208.

[0127] Figure 2B An example of an optical lens system disclosed herein is schematically shown, and is numbered 250. The optical lens system 250 comprises a conventional (refractive) lens. The lens system 250 can be comprised in a folded camera with a tilted OP, for example as shown in Figure 1C D. The lens system 250 comprises a lens 252, a mirror 254, (optional) optical element 262 and an image sensor 256. The lens 252 comprises 4 lens elements, numbered L1-L4. The lens system 250 has a first optical path OP1 258 and a second optical path OP2 260. The optical lens axis of the lens 252 is parallel to OP1 258, and parallel to the y-axis. The direction of OP2 260 is perpendicular to the image sensor 256. The surface types are defined in Table 4. The surface thicknesses with respect to the mirror are given with respect to OP1 258 and OP2 260, respectively. The coefficients of the surfaces are listed in Table 5. The half diameter (D / 2) of the mirror 254 is defined by a circle that fully contains the mirror 254. The mirror 254 has dimensions of 5.0x5.1mm. The tilt angle β of the mirror 254 with respect to the y-axis is 47.8 degrees. In other examples, the tilt angle β can range from 45<β≤65 degrees. In other examples, 46<β≤50 degrees. OP2 260 is not parallel to the z-axis, but makes an angle α with the z-axis. The MH S of the optical lens system 250 is defined by H Sensor = 4.8mm. The mechanical height (“M-H Sensor ” of the image sensor 256 is also shown in the figure. M-H Sensor = 7.0mm. ΔLO=0.58mm. TTL1=7.04mm, BFL1=2.73mm, TTL2=BFL2=8.29mm, so BFL=11.02mm, TTL=15.33mm. The power sequence of the lens elements L1-L4 is positive-negative-positive-positive. The entrance pupil (or stop or “A.S.”) is located after L4, i.e. on the image side of the lens 252. f1 is positive, f1 / EFL=0.53. The f / # of the optical lens system 250 is relatively low, f / #=2.4.

[0128] The lens element thickness of each L2, L3 and L4 is relatively small, i.e. for each of L2, L3 and L4, T i and the minimum lens element radius (D / 2) iThe ratio satisfies T i / (D / 2) i <0.25. For each of L2 and L3, the ratio satisfies T i / (D / 2) i <0.2.

[0129] L1, L2, and L2, L3, and L3, L4 are in close proximity to each other. G3 = 0.1 mm (between L3 and L4), G3 is the largest gap between any lens elements, i.e., G1 < G3 and G2 < G3. G3 is on the optical axis 258. The ratio G3 / H L = 2.2%.

[0130] The distance between L1 and L3 (“d L1-L3 ”) is relatively small, i.e., d L1-L3 < 0.75 mm, the ratio d L1-L3 / H L < 0.2. Specifically, d L1-L3 = 0.63 mm, d L1-L3 / H L = 0.14. In other words, the distance that L2 spreads out (or occupies) is relatively small. The small G i , T i , and small distance between lens elements facilitate a thin camera.

[0131] The image-side surface of L4 is S8. The diameter D8 of S8 is relatively small, the ratio of D8 and DA satisfies DA / D8 = 1.42.

[0132] L4 is a half-moon shaped convex surface formed towards the object side, i.e., both the front surface of L4 and the back surface of L4 are convex towards the object side. S5 and S6 (i.e., the two surfaces of L3) are concave towards the object side, and each of them contains two deflection points. In other examples, the lens 252 can be cut to implement a cut lens based on the lens 252.

[0133]

[0134] Table 4

[0135] Table 5

[0136] Table 5 (continued) Figure 3Another example of an optical lens system disclosed herein is shown, numbered 300. The optical lens system 300 comprises a hybrid lens 302, i.e. a lens comprising at least one superlens element. The lens 302 comprises a plurality (N = 4) of lens elements, numbered LI - L4. The optical lens system 300 further comprises an image sensor 306 and (optionally) an optical element 312, e.g. an IR filter. In other examples, the optical lens system 300 can further comprise an OPFE (not shown) that bends OP1 to OP2 (not shown). OP1 is substantially parallel to the y-axis, OP2 is substantially parallel to the z-axis. The optical axis of the lens 302 is parallel to OP1. The OPFE can be at a 45 degree angle to both the y-axis and the z-axis.

[0137] Here, L2 is a superlens element. The superlens element is fabricated on top of (or located on top of) the substrate. In other words, the superlens element is located on the front surface (object side) of the substrate. This applies to all superlens elements below. The substrate has a substrate height H Substrate Here, H Substrate = 0.2 mm. In other examples, H Ssubstrate may range from 0.05 mm < H Substrate < 1 mm. The substrate is made of glass. This applies to all superlens elements below.

[0138] Compared to the regular lens 202 of the optical lens system 200, the hybrid lens 302 of the optical lens system 300 has a significantly lower H L , despite the fact that the optical properties (EFL, SD, DA, etc.) of the corresponding camera comprising either the regular lens 202 or the hybrid lens 302 are exactly the same. In particular, the hybrid lens 302 has a H L that is 24% lower than the H L of the regular lens 202. This indicates that the hybrid lens is advantageous for use in slim mobile cameras.

[0139] L4 is spread over a relatively short distance (“d L4 ”). d L4 = 0.53 mm, the ratio d L4 / H L = 0.14. G1 = 0.032 mm, which is located at the optical axis 308. G2 is not located on the optical axis 308. G2 = 0.25 mm, so L2 and L3 are not very close to each other. This can facilitate the use of a thicker substrate with H Substrate > 0.2 mm, without having to increase H L significantly.

[0140] The surface types are defined in Table 6. The coefficients of the surfaces of the regular lens elements (L1, L3, L4) are defined in Table 7. The phase coefficients of the superlens element (L2) are defined in Table 8. The phase coefficients are given according to the following polynomial expansion (here: coefficients A i ), which is the same as used by Binary Optic2 of Zemax (M is the diffraction order, here M = 1):

[0141]

[0142] Table 6

[0143] Table 7

[0144] Table 7 (continued)

[0145] Table 8

[0146] Table 8 (continued) Figure 4 Another example of an optical lens system disclosed herein is shown, which is numbered 400. The optical lens system 400 comprises a hybrid lens. L2 is a superlens element. The optical lens system 400 comprises a lens 402 having a plurality (N) of lens elements (here N = 4) (numbered L1 - L4), an image sensor 406, and (optional) optical element 412. In other examples, the optical lens system 400 can also comprise an OPFE (not shown) that bends OP1 to OP2 (not shown). The lens optical axis of the lens 402 can be oriented parallel to OP1. The OPFE is at 45 degrees to both the y-axis and the z-axis.

[0147] L4 is spread over a relatively short distance (“d L4 ”). L4 = 0.48 mm, the ratio d L4 / H L = 0.12. G1 = 0.02 mm, located at the optical axis 408. G2 = 0.17 mm, not located at the optical axis 408.

[0148] The surface types are defined in Table 9. The coefficients of the surfaces of the regular lens elements (L1, L3, L4) are defined in Table 10. The phase coefficients of the superlens element (L2) are defined in Table 11.

[0149]

[0150] Table 9

[0151] Table 10

[0152] Table 10 (continued)

[0153] Table 11

[0154] Table 11 (continued) Figure 5 Another example of an optical lens system disclosed herein is shown, which is numbered 500. The optical lens system 500 includes a hybrid lens. Here, L4 is a superlens element. The optical lens system 500 includes a lens 502 having a plurality (N) of lens elements (here N = 4) numbered LI - L4, an image sensor 506, and (optional) optical element 512. The optical lens system 500 can also include an OPFE (not shown) that bends OP1 to OP2 (not shown). The lens optical axis of the lens 502 can be oriented parallel to OP1. The OPFE is at 45 degrees to both the y-axis and the z-axis. LI is relatively thin, T1 / H L = 0.25. G1 = 0.02 mm, which is on the optical axis 508. G3 = 0.03 mm, which is on the optical axis 508. The front and back surfaces of L2 are convex with respect to the object side. The front and back surfaces of L3 are concave with respect to the object side. Table 12 defines the surface types. Table 13 defines the coefficients of the surfaces of the regular lens elements (LI, L2, L3). Table 14 defines the phase coefficients of the superlens element (L4).

[0155]

[0156] Table 12

[0157] Table 13

[0158] Table 13 (continued)

[0159] Table 14

[0160] Table 14 (continued) Figure 6Another example of an optical lens system disclosed herein is shown, numbered 600. Optical lens system 600 includes a hybrid lens. Here, L4 is a superlens element. Optical lens system 600 includes a lens 602 having a plurality (N = 4) of lens elements (numbered L1 - L4), an image sensor 606, and (optional) optical element 612. Optical lens system 600 can also include an OPFE (not shown) that bends the first OP1 to the second OP2 (not shown). The lens optical axis 608 of lens 602 is oriented parallel to OP1. The OPFE is at a 45 degree angle to both the y-axis and the z-axis.

[0161] G1 = 0.02 mm, which is on the optical axis 608. G3 = 0.02 mm, which is also on the optical axis 608. The front and back surfaces of L2 are convex with respect to the object side. L3 is spread over a relatively short distance (“d L3 ”). L3 = 0.5 mm, the ratio d L3 / H L = 0.12.

[0162] Surface types are defined in Table 15. Coefficients of surfaces of regular lens elements (L1, L2, L3) are defined in Table 16. Phase coefficients of superlens element (L4) are defined in Table 17.

[0163]

[0164] Table 15

[0165] Table 16

[0166] Table 16 (continued)

[0167] Table 17

[0168] Table 17 (continued) Figure 7 Another example of an optical lens system disclosed herein is shown, numbered 700. Optical lens system 700 includes a hybrid lens. Here, L2 and L4 are superlens elements. Optical lens system 700 includes a lens 702 having a plurality of lens elements (N = 5) (numbered L1 - L5), an image sensor 706, and (optional) optical element 712. Optical lens system 700 can also include an OPFE (not shown) that bends the first OP1 to the second OP2 (not shown). The lens optical axis of lens 708 is oriented parallel to the first OP1. The OPFE is at a 45 degree angle to both the y-axis and the z-axis.

[0169] G1 = 0.04 mm, which is on the optical axis 708. G4 = 0.04 mm (between L4 and L5), also on the optical axis 708. The front and back surfaces of L3 and L4 are concave with respect to the object side. G2 is not on the optical axis 708. G2 = 0.42 mm, so L2 and L3 are not very close to each other.

[0170] The surface types are defined in Table 18. The coefficients of the surfaces of the regular lens elements (L1, L2, L3) are defined in Table 19. The phase coefficients of the superlens element (L2, L4) are defined in Table 20.

[0171]

[0172] Table 18

[0173] Table 19

[0174] Table 19 (continued)

[0175] Table 20

[0176] Table 20 (continued) Figure 8 Another example of an optical lens system disclosed herein is shown, which is numbered 800. The optical lens system 800 includes a hybrid lens. Here, L2 is a superlens element. The substrate height H Ssubstrate = 0.6 mm. The optical lens system 800 includes a lens 802 having a plurality (N = 4) of lens elements (numbered L1 - L4), an image sensor 806, and (optional) optical element 812. The optical lens system 800 can also include an OPFE (not shown) that bends the first OP1 to the second OP2 (not shown). The lens optical axis 808 of the lens 802 can be oriented parallel to OP1. The OPFE is at a 45 degree angle to both the y-axis and the z-axis. G1 = 0.02 mm, which is on the optical axis 808. L4 is unfolded over a relatively short distance (“d L4 ”). L4 = 0.49 mm, the ratio d L4 / H L = 0.12.

[0177] The surface types are defined in Table 21. The coefficients of the surfaces of the regular lens elements (L1, L3, L4) are defined in Table 22. The phase coefficients of the superlens element (L2) are defined in Table 23.

[0178]

[0179] Table 21

[0180] Table 22

[0181] Table 22 (continued)

[0182] Table 23

[0183] Table 23 (continued) In some examples, a regular or hybrid lens, such as 202, 252, 302, 402, 502, 602, 702, or 802, can be a cut lens known in the art. Referring to Figure 1A and Figure 1C , one or more lens elements can be cut in a direction parallel to the y-axis such that a lens length L L (“L L ”) of the cut lens element measured along the z-direction is less than a lens width (“W L ”) measured along the x-direction, i.e., L L < W L . The lens length L L may be cut by about 20% - 50%, i.e., L L may be about 20% - 50% less than W L . The cut of the lens can result in a significant saving in H M , which is beneficial for the design of thin mobile devices. A 20% cut of the lens can result in a saving of about 10 - 20% in H M .

[0184] It is to be understood that certain features of the subject disclosure, which are, for clarity, described in the context of separate examples, can also be provided in combination in a single example. Conversely, various features of the subject disclosure, which are, for brevity, described in the context of a single example, can also be provided separately or in any suitable

[0185] The use of the term "and / or", unless otherwise indicated, is to be taken as specific permission that the conjunctive term can encompass either or both of the conjunctive terms.

[0186] It is to be understood that the terms "including", "comprising", "consisting" and "consisting essentially of" when used in the specification, are not to be construed as limiting the subject disclosure to the specific examples recited. Rather, they are to be taken as specifying the enumerated substantial, but not necessarily all, elements or features of a variety of embodiments of the subject disclosure.

[0187] All patents and patent applications mentioned in this specification are herein incorporated by reference in their entirety to the same extent as if each individual patent or patent application was specifically and individually incorporated by reference. Further, 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.

Claims

1. A camera, characterized in that, Comprising: A lens having N lens elements L arranged along the optical axis OA. i and the effective focal length EFL, where 1≤i≤N, where the first lens element L1 faces the object side, and the last lens element L N Oriented towards the image side; An image sensor; And An optical path bending element OPFE for bending a first optical path OP1 to a second optical path OP2 perpendicular to the image sensor; The camera is a folding camera, at least one of the N lens elements is a superlens element, and the focal length f of the superlens element is... M Satisfy f M / EFL>7.

5.

2. The camera according to claim 1, wherein f M / EFL<100.

3. The camera according to claim 1, wherein the individual lens element is a superlens element, and wherein 10 <f M / EFL<50.

4. The camera according to claim 1, wherein 100mm <f M <1500mm.

5. The camera according to claim 4, wherein f M At 200mm <f M Within a range of <1000mm.

6. The camera according to claim 1, wherein the single lens element is a meta-lens element, and wherein the meta-lens element is the second lens element L2 or the fourth lens element L4.

7. The camera according to claim 1, wherein the two lens elements are superlens elements, wherein the first superlens element closer to the object side has a first focal length f. M1 The second superlens element, closer to the image side, has a second focal length f. M2 And f M1 and f M2 All are positive.

8. The camera according to claim 7, wherein f M1 / EFL>7.5 and f M2 / EFL<100.

9. The camera according to claim 7, wherein f M1 and f M2 At 100mm <f M1 ,f M2 Within a range of <1500mm.

10. The camera according to claim 7, wherein the two meta-lens elements are the second lens element L2 and the fourth lens element L4.

11. The camera according to claim 1, wherein the lens comprises one or more refractive lens elements, and wherein all the refractive lens elements are located on the object side of the OPFE.

12. The camera according to claim 1, wherein the lens is located on the object side of the OPFE.

13. The camera according to claim 1, wherein the EFL is in the range of 8 mm < EFL < 40 mm.

14. The camera according to claim 13, wherein 10 mm < EFL < 27.5 mm.

15. The camera according to claim 1, wherein the image sensor has a full sensor diagonal length SD, and wherein 0.3 < SD / EFL < 0.

7.

16. The camera according to claim 1, wherein N ≥ 4.

17. The camera according to claim 1, wherein the lens has a lens height H measured along OP1. L and the total length of the lens TTL, and where H L / TTL<40%.

18. The camera according to claim 1, wherein the lens has a total lens length TTL, and wherein TTL / EFL < 1.

1.

19. The camera according to claim 1, wherein the lens has an f-number f / #, and wherein f / # < 3.

75.

20. The camera according to claim 1, wherein the OPFE is oriented at an angle β with respect to the OA, and wherein β > 45 degrees.

21. The camera according to any one of claims 1–20, wherein the camera is included in a camera module, wherein the camera module has a module region and a shoulder region, the module region having a module region height H measured along OP1. M The shoulder region has a shoulder region height H measured along OP1. S And H M >H S .

22. A mobile device, characterized in that, Comprising the camera according to claim 21, wherein the mobile device has a device thickness T and a camera protrusion, wherein the protrusion area has a raised height T + B along OP1, wherein the module area is included in the camera protrusion area, and at least some parts of the shoulder area are not included in the camera protrusion area.

23. The mobile device according to claim 22, wherein the mobile device is a smart phone.

Images