Refractor and hybrid lenses for compact, foldable telephoto cameras

Abstract

A foldable digital camera for use in a mobile device such as a smartphone, comprising: a lens having N≧4 lens elements, an effective focal length (EFL) and an f-number f / #, a folded optical path element (OPFE), and an image sensor having a sensor diagonal SD. Some of the lenses may be metalens or include metalens elements. In some cameras, the lenses are located on the subject side of the OPFE and are 8mm <EFL<50mm、SD / EFL> 0.4, f / #<2.75. For some cameras with M ≥ 1 lens element and O = NM lens elements, the 8mm <EFL<40mmであり、SD / EFL> It is 0.3.

Description

[Technical Field]

[0001] Cross-reference of related applications This application relates to and claims priority to U.S. Provisional Patent Application No. 63 / 386,912 filed on 11 December 2022, U.S. Provisional Patent Application No. 63 / 476,406 filed on 21 December 2023, U.S. Provisional Patent Application No. 63 / 495,141 filed on 10 April 2022, and U.S. Provisional Patent Application No. 63 / 543,309 filed on 10 October 2023, all of which are incorporated herein by reference in their entirety.

[0002] The subject matter of this disclosure generally relates to the field of digital cameras.

[0003] definition In this application, and with respect to the optical and other properties mentioned in the description and figures, the following symbols and abbreviations are used, all relating to terms known in the art. Total Track Length (TTL): The maximum distance measured along an axis parallel to the optical axis of the lens between a point S1 on the front surface of the first lens element L1 and the image sensor when the system is focused on a subject at infinity. Back-facing focal length (BFL): The final lens element L when the system is focused on a subject at infinity. N Rear S 2N The minimum distance measured between the point and the image sensor, along an axis parallel to the optical axis of the lens. Effective focal length (EFL): Lens (lens element L1~L N In the assembly, the distance between the rear principal point P' and the rear focal point F' of the lens. f-number (f / #): The ratio of EFL to the entrance pupil diameter (or "aperture diameter" or "DA") of the lens. [Background technology]

[0004] A multi-aperture camera (or "multi-camera", an example of which is a "dual camera" having two of them) is standard in today's portable handheld mobile devices ("mobile devices", such as smartphones, tablets, headsets, etc.). The multi-camera is compact in size, that is, it has a relatively small height (or thickness), width, and length, and is beneficial for use in compact mobile devices. The multi-camera typically has a wide field of view (or "angle") FOV W a camera ("wide" camera or "W" camera), and, for example, at least one additional camera having a (FOV W narrower) field of view than). The FOV (FOV T having a telephoto or "Tele" camera), or an ultra-wide field of view FOV UW (FOV W wider than, a "UW" camera).

[0005] FIG. 1A schematically shows an example of a known foldable telephoto camera 100. The camera 100 includes a lens 102, an optical path bending element (OPFE) 104 (e.g., a prism or a mirror), and an image sensor 106. The OPFE 104 folds a first optical path ("OP1") 108 into a second OP2 110. Light from the scene passes through the lens 102, is reflected by the OPFE 104, and impinges on the image sensor 106. Here, and hereinafter, "height" (e.g., as shown in the figure, the height H of the lens 102 L or the height H of the image sensor 106 S ) is measured along an axis parallel to OP1 108, and "length" (e.g., as shown in the figure, the length L of the lens 102 L ) is measured along an axis parallel to OP2 110. The lens 102 includes a plurality of N numbered lens elements (here N = 4) from L1 to L N . The lens 102 is disposed on the subject side of the OPFE, a lens optical axis ("OA") parallel to OP1 108, and a lens height (or lens thickness) H L as well as a lens length (or lens width) L LIt has ΔLO, which indicates the distance between lens 102 and OPFE 104. OPFE This indicates the total length of OPFE 104 in the z-axis direction. OPFE 104 may be oriented at a 45-degree angle to OP1 and OP2, resulting in the height H of OPFE 104. OPFE In contrast, H OPFE =L OPFE This results in the following: The TTL and BFL of camera 100 are divided into TTL1 and TTL2 and BFL1 and BFL2, respectively. TTL1 and BFL1 are parallel to OP1 108, and TTL2 and BFL2 are parallel to OP2 110. TTL = TTL1 + TTL2, BFL = BFL1 + BFL2. The aperture of camera 100 is numbered 112 and has an aperture diameter ("DA"). Such known folding telephoto cameras are disclosed, for example, in PCT / IB2022 / 055745, which is included herein in its entirety. In all examples disclosed herein, the f / # of a camera such as camera 100 is given by f / # = EFL / DA.

[0006] The length of the camera module, including cameras such as Camera 100 ("minimum module length" or "ML") 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 limits of ML have been demonstrated. M ,MH S , and MH M The size is defined by the minimum dimensions of the components included in the camera 100. The camera module has a housing 114. The housing 114 defines the size (or dimensions) of the camera module. The camera module has a height H M The module area 116 and height H S <H M It has a shoulder region 118.

[0007] To estimate the theoretical limit of the minimum dimensions of a camera module including the optical lens system described herein, the following parameters and their interdependencies are introduced. Note that, contrary 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, such as housing 114.

[0008] ML M and "module length" ("L M ) Minimum module length (ML M ) is the theoretical limit of the length of the camera module, including all the components of camera 100. ML M = Z Lens -Z Sensor , here, Z Lens This is the maximum z value of lens 102, Z Sensor This is the minimum z value of the image sensor 106. In other words, it is measured along OP2 110, ML M This represents the maximum distance from any part of the lens 102 to any part of the image sensor 106. Camera module length ("L M To achieve a realistic estimate of '', for example, a length of 3.5 mm is used in ML M It may be added to, that is, L M =ML M This is +3.5mm. The additional length accounts for lens stroke that may be required for optical image stabilization (OIS) as well as for image sensor packaging, housing, etc. In other examples, +5mm, or +2.5mm, or even a further +2mm may be added.

[0009] Minimum module area length MRL M MRL M is, height H M This is the theoretical module region length limit of module region 116 having MRL. MThis is defined by the lens 102 included in the module region 116, i.e., MRL M =L L That is the case.

[0010] Minimum shoulder area length (MRL) S and shoulder length ("L S ) MRL S is, height H S <H M This is the theoretical module domain length limit of the shoulder region 118 having MRL. S This is defined by the image sensor 106 located in the shoulder region 118. MRL S =ML M -MRL M . In general, given ML M In contrast, from an industrial design perspective, MRL S Maximize (MRL M Minimizing () can be beneficial because it can minimize BL (Figure 1B). L S To achieve a realistic estimate, for example, a length of 2.5 mm is used for the MRL. S It may be added to, that is, L S =MRL S This is +2.5mm. In other examples, you could add +5mm, or +2mm, or even another +1.5mm.

[0011] MH M and "module height" ("H M ) MH M This is the theoretical limit of the height of the module region 116. MH M This is given by the difference between the lowest y value occupied by the image sensor 106 and the highest y value occupied by the lens 102. In other words, measured along OP1 108, MH M This represents the maximum distance from any part of the lens 102 to any part of the image sensor 106. HM To achieve a realistic estimate of MH, M An additional 1.5 mm in height can be added, i.e., H M =MH M It's +1.5mm. The additional length should account for the housing, lens cover, etc. In other examples, you could add +3mm, or +1mm, or even another +0.5mm.

[0012] Minimum shoulder height (MH S ) and "shoulder height" ("H S ) MH S This is the theoretical limit of height h. In some examples, the shoulder region 118 is MH S The height H of the image sensor 106 is Sensor It may be determined solely by, that is, MH S =H Sensor That is the case. The image sensor 106 may have a width:height ratio of 4:3, and as a result, the full sensor diagonal (SD) is SD = 5 / 3·H Sensor It is given by. H S MH S It is estimated by adding, for example, an additional height of 1.5 mm, i.e., H S =MH S This is +1.5mm. The additional height takes into account the contact sensor 106 and the housing. In other examples, you may add +3mm, or +1mm, or even another +0.5mm.

[0013] Figure 1B schematically shows in cross-section a mobile device 120 (e.g., a smartphone) including a known folding telescopic camera 100. The aperture 112 of the camera 100 is located on the rear (or "world-facing") surface 122, facing towards the scene, and the front (or "user-facing") surface 124 on the opposite side of the surface 122 can include, for example, a screen (not shown). The mobile device 120 may include a processor such as an application processor ("AP"). The processor may be configured to process image data captured by a wide camera, a telescopic camera, and / or an UW camera included in the mobile device. The mobile device 120 has a normal region 126 of thickness ("T") and a camera bump region 128 that protrudes above the normal 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 may be integrated into the bump region 128, and the shoulder region 118 may be integrated into the normal region 126. For industrial design reasons, small camera bumps (i.e., short BL) and thin camera bumps (i.e., low B) are desired. The camera 100 is only partially integrated into the bump region, which allows for a relatively short BL. Generally, in the case of a slim mobile device, MH M and MH S It is beneficial to minimize. In particular, minimizing MH M makes it possible to minimize B, which is interesting. In the case of a compact camera, minimizing ML M is also beneficial. In particular, minimizing MRL M makes it possible to minimize BL, which is interesting. B Min is the theoretical minimum value of the height B of the camera bump region 128, and B Min = H M is given by -T. <00>

[0014] Figure 1C schematically shows an example of a folding telescopic camera disclosed herein and numbered 130. The camera 130 includes a lens 132 having a plurality of N lens elements (here N = 4) numbered L1 to L4, and L1 is directed toward the subject side. The camera 130 further includes an OPFE 134 that bends the first optical path OP1 138 to the second optical path OP2 140, and an image sensor 136. The camera may be included within a housing 142 as shown. In the camera 130, OP 1138 is substantially parallel to the y-axis and the lens OA. OP2 140 is oriented perpendicular to the image sensor 136. OP2 140 forms an angle α with the z-axis, and thus, with respect to OP2 140, it is referred to as the "tilted OP". OPFE 134 forms an angle β>45 degrees with the y-axis and an angle 90-β<45 degrees with the z-axis. At the time of the tilt of OP 140, BFL2 and TTL2 each have a component measured along the y-axis ("TTL2 y ", "BFL2 y ") and a component measured along the z-axis ("TTL2 z ", "BFL2 z "), and thus, BFL2 = sqrt(BFL2 y 2 +BFL2 z 2 ) and TTL2 = sqrt(TTL2 y 2 +TTL2 z 2 ). At the time of the tilt of OP, the sensor 136 forms an angle of 2×(β - 45) with the y-axis.

[0015] The advantages of such a camera having a tilted OP are as follows. 1. Incorporation of a large image sensor, for example, larger than 1 / 2.5 inches. A large image sensor is beneficial for capturing a relatively large amount of light. 2. Low f / #. A low f / # is beneficial for capturing a relatively large amount of light and for imaging with a relatively high spatial (or pixel) resolution. 3. A more compact module size, i.e., MH Mand ML M This can be made smaller for cameras with non-angled op-optics (assuming the same EFL, lens aperture, and image sensor size for cameras with angled and non-angled op-optics, respectively).

[0016] Figure 1D schematically shows another mobile device 150 having the dimensions and components described in Figures 1B and 1C, including a foldable telephoto camera 130, in a cross-sectional view. The camera 130 is fully integrated into the camera bump region 128. The lens element of the lens 132 may be supported by a lens barrel.

[0017] In other examples, the housing of a foldable telephoto camera, such as the foldable telephoto camera 130, has a module area height H, as shown for the foldable telephoto camera 100. M A module region having a shoulder region height H S <H M The camera may have a shoulder region and (or be divided into) a module region. Such a telephoto camera may be included in a mobile device, as shown for mobile device 120. That is, the shoulder region may be included in the normal region of the mobile device, and the module region may be included in the camera bump region of the mobile device.

[0018] The advantages of cameras 100 and 130 are given H MThe advantage is that a relatively large aperture diameter ("DA") can be achieved for (or given bump thickness T+B), which results in a relatively low f / #. This is because the optical power of lenses 102 and 132 concentrates the light before it enters OPFE 104 and OPFE 134, respectively. "Concentrating the light" here means that a first circle, oriented perpendicular to the optical axis of the lens and containing all the rays that form an image on the image sensor, located on the subject side of the lens, is larger than a second circle, oriented perpendicular to the optical axis of the lens and containing all the rays that form an image on the image sensor, located on the image side of the lens and on the subject side of the OPFE. H of Cameras 100 and 130 M (and therefore B) is H L Restricted by, i.e., H M In order to reduce H L It must be reduced.

[0019] Including conventional diffractive lenses (CDLs) in the category of "ordinary" (or "refractive") lenses is H LIt is known that the height of lenses can be significantly reduced. The same applies to the weight of the lens. Here, a normal lens refers to a lens containing multiple N refractive lens elements, all made of glass and / or plastic. When one or more CDLs or diffractive lenses are introduced into a normal lens, it is called a "hybrid" lens. For example, Canon describes the capabilities of CDLs in terms of chromatic aberration correction in hybrid lenses in the paper "Research on multi-layer diffractive optical elements and their application to camera lenses" (T. Nakai and H. Ogawa, in Diffractive Optics and Micro-Optics, R. Magnusson, ed., Vol. 75 of OSA Trends in Optics and Photonics Series (Optica Publishing Group, 2002), paper DMA2.). Plastic and glass lenses exhibit positive chromatic aberration, meaning that blue light is refracted more strongly than red light. In contrast, CDLs exhibit negative chromatic aberration, meaning that red light is refracted more strongly than blue light. Combining these characteristics in a hybrid lens enables efficient and slim chromatic aberration correction, while still supporting a given set of lens parameters such as EFL, TTL, f / #, etc., and lower H L This makes it possible. As detailed above, camera 100 has a lower H L is lower H M, and therefore enabling slimmer camera modules. Recently, significant progress has been made in the field of metalenses ("MLs"). This is detailed in the paper "The advantages of metalenses over diffractive lenses", J. Engelberg and U. Levy, Nat Commun 11, 1991 (2020). By fabricating specific nanostructures on the first surface of a substrate, MLs are formed on the first surface. That is, MLs are located only on the first side of the substrate. In MLs, phases are induced via the response of light on the nanostructure. MLs are distinguished from CDLs by their smaller structural size. A metalense is called a metalense if it contains a subwavelength quasi-periodic structure, and a CDL is called a CDL if it contains a superwavelength quasi-periodic structure. MLs share many of the properties of DOE, namely, the property of exhibiting negative chromatic aberration. Therefore, H of refractive plastic (and / or glass) lenses, and furthermore, hybrid lenses containing one or more MLs L H is a normal lens that includes only refractive lenses. L It is reasonable to assume that it could be significantly lower than that.

[0020] Having slim conventional lenses, as well as plastic (and / or glass) lenses and hybrid lenses including one or more MLs, would be beneficial for enabling slim mobile cameras. Such slim conventional lenses and hybrid lenses are disclosed herein. [Overview of the Initiative]

[0021] In various exemplary embodiments, the lens optical axis is OA, and there are N≧4 lens elements L i It has an effective focal length EFL, aperture diameter DA, f-number f / #, total track length TTL, and back focal length BFL, and each lens element has its respective focal length f i It has a first lens element L1 facing the subject side, and the final lens element L NA camera comprising a lens facing the image side, an image sensor having a full sensor diagonal SD, and an optical path bending element OPFE for providing a bent optical path between the subject and the image sensor, the camera being a folding digital camera, the lens being disposed on the subject side of the OPFE, with the EFL in the range of 8mm < EFL < 50mm, SD / EFL > 0.4, and f / # < 2.75.

[0022] In some examples, f / # < 2.7. In some examples, f / # < 2.6. In some examples, f / # < 2.5.

[0023] In some examples, the OPFE is oriented at an angle β with respect to the lens OA, where 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.

[0024] In some examples, SD / EFL > 0.5.

[0025] In some examples, the camera is included in a camera module having a module height H M and SD / H M > 0.7.

[0026] In some examples, the camera is included in a camera module having a module height H M and SD / H M > 0.75.

[0027] In some examples, N = 4 and the power sequence of the lens elements L1 to L4 is plus - minus - plus - plus.

[0028] 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, T i / (D / 2) iThe ratio is <0.25. In some examples, T for each of L2 and L3. i (D / 2) i < 0.2.

[0029] In some examples, the camera has an aperture diaphragm located on the image side of the lens.

[0030] In some examples, the lens has a lens height H L The closest gap G between all pairs of consecutive lens elements is less than 0.2 mm, and the ratio G / H is for all pairs of consecutive lens elements. L <5% is satisfied. In some examples, G / H L It is <2.5%.

[0031] In some examples, the maximum G is located between L3 and L4.

[0032] In some examples, the lens has a lens height H L It has a distance (d) between L1 and L3. L1-L3 ) is d L1-L3 <0.75mm, ratio d L1-L3 / H L <0.2 is satisfied. In some examples, d L1-L3 / H L <0.15.

[0033] In some cases, TTL / EFL < 1.05.

[0034] In some examples, the lens height H is measured along OP1. L It has, and the ratio is H L The condition / TTL < 0.4 is satisfied. In some examples, H L / TTL < 0.35.

[0035] In some cases, BFL / TTL > 0.5.

[0036] In some cases, S8 is the image-side plane of L4, has a lens element surface diameter D8, and the ratio of D8 to DA satisfies DA / D8 > 1.3. In some cases, DA / D8 > 1.4.

[0037] In some embodiments, both the front and rear surfaces of L3 are formed in a concave shape toward the subject.

[0038] In some embodiments, both the front and rear surfaces of L4 are formed in a convex shape toward the subject.

[0039] In some examples, both the front and rear surfaces of L3 contain two deflection points.

[0040] In some examples, 5mm <DA<8mmである。

[0041] In some cases, 10mm <EFL<20mmである。

[0042] In some examples, 5mm <SD<10mmである。

[0043] In some cases, all lens elements are made of plastic.

[0044] In some cases, the camera is 7.5mm <H M Module height H in the range of <15mm M It is included in a camera module that has a 9mm lens. In some examples, it has a 9mm lens. <H M It is <12mm.

[0045] In some examples, the lens is a cut lens, cut along an axis parallel to the optical axis of the lens. In some examples, the lens is cut by only 20% of the axially symmetric lens diameter, H M It is reduced by only >7.5% through cutting.

[0046] In various exemplary embodiments, the lens element L has N≧4. i It has a lens height H L, having an effective focal length EFL and a total track length TTL, and each lens element having a respective focal length f i having, with the first lens element L1 facing the subject side and the final lens element L N facing the image side, a lens comprising an image sensor having a full sensor diagonal SD, and an optical path folding element OPFE for folding a first optical path OP1 into a second optical path OP2 perpendicular to OP1, the camera being a folding camera, the lens being located on the subject side of the OPFE, having a lens optical axis parallel to OP1, the EFL being within the range 8 mm < EFL < 40 mm, the lens element with M ≧ 1 being a metasurface lens, the lens element with O = N - M being a refractive lens, and a camera is provided with SD / EFL > 0.3

[0047] In some examples, SD / EFL > 0.35. In some examples, SD / EFL > 0.4.

[0048] In some examples, H L / TTL < 20%.

[0049] In some examples, M = 1, the single metasurface lens having a positive focal length f M having, f M / EFL > 7.5. In some examples having M = 1 and a positive f M having, f M / EFL > 15. In some examples having M = 1 and a positive f<http: / / www.example.com / M having, f M / EFL > 30. In some examples having M = 1 and a positive f M having, 7.5 < f M / EFL < 100. In some examples having M = 1 and a positive f M having, 10 < f M / EFL < 50.

[0050] In some examples with M = 1, 100 mm < f M < 150 mm. In some examples with M = 1, 200 mm < f M < 1000 mm.

[0051] In some cases where M=1, a single metalens element includes L2. In some cases where M=1, a single metalens element includes L4.

[0052] In some examples, M=2, the two metalens elements are L2 and L4, and L2 has a focal length f M1 L4 has a focal length f M2 It has, f M1 and f M2 Both are positive. In some such cases, 7.5 <f M1 / EFL and f M2 / EFL < 100. In some such cases, 10 <f M1 / EFL and f M2 / EFL < 50. In some such cases, f M1 and f M2 Both are 100mm <f M1 ,f M2 It is within the range of <1500mm. In some such examples, f M1 and f M2 Both are 200mm <f M1 ,f M2 It is within the range of <1000mm. In some cases, 0.25 <f M1 / f M2 <1

[0053] In some cases, all refractive lenses are plastic lenses.

[0054] In some examples, M metalens are each placed on the subject side of the substrate H Substrate The height is 0.1 mm <H Substrate The substrate must meet the requirement of <1mm and be made of glass.

[0055] In some examples, M metalens are each placed on the subject side of the substrate H Substrate The height is 0.15 mm <H Substrate The substrate must meet the requirement of <0.75mm and be made of glass.

[0056] In some examples, N = 4, and the power sequence of the lens elements L1 to L4 is positive - positive - negative - positive. In some examples, N = 4, f3 is negative, and its magnitude is |f3| < EFL / 2.5. In some examples, N = 4, f3 is negative, and its magnitude is |f3| < EFL / 5.

[0057] In some examples, f1 is positive and f1 < EFL / 2. In some examples, f1 is positive and f1 < EFL / 1.5.

[0058] In some examples, N = 4, and the power sequence of the lens elements L1 to L4 is positive - negative - negative - positive.

[0059] In some examples, N = 5, and the power sequence of the lens elements L1 to L5 is positive - positive - negative - positive - positive.

[0060] In some examples, 10mm < EFL < 30mm. In some examples, 12.5mm < EFL < 27.5mm.

[0061] In some examples, TTL / EFL < 1.05. In some examples, TTL / EFL < 1.0.

[0062] In some examples, BFL / TTL > 0.75. In some examples, BFL / TTL > 0.8.

[0063] In some examples, 4mm < SD < 15mm. In some examples, SD > 6mm. In some examples, SD > 9mm.

[0064] In some examples, 4mm < DA < 11mm and 2 < f / # < 6.5. In some examples, 6mm < DA < 9mm and 3 < f / # < 5.

[0065] In some examples, f / # < 4.0.

[0066] In some cases, OPFE is a mirror image.

[0067] In some cases, the camera is 7.5mm <H M Module height H in the range of <15mm M It is included in a camera module that has a 9mm lens. In some examples, it has a 9mm lens. <H M It is <13.5mm.

[0068] In some examples, the camera is contained within a camera module, and the camera module has a module length L. M It has L M <EFLである。

[0069] In some examples, the lens and OPFE are included in the module region, and the image sensor is included in the shoulder region.

[0070] In some cases, a camera is included in a mobile device. In some cases, the mobile device is a smartphone.

[0071] In some examples, a mobile device is provided that includes one of the above cameras, the mobile device having a device thickness T and a camera bump height B, the camera bump area having an elevated height T+B, and the camera is fully integrated into the camera bump.

[0072] In some examples, the camera described above has a module area height H M A first module region having a shoulder region height H S A camera module having a second shoulder region having H M >H S In some cases, DA > H S -3mm. In some cases, DA>H S -2mm. In some cases, DA>H S It is -1mm. [Brief explanation of the drawing]

[0073] Non-limiting examples of embodiments disclosed herein are described below with reference to the figures accompanying this specification, which are listed after this paragraph. The drawings and descriptions are intended to illustrate and clarify the examples disclosed herein and should not be considered limiting in any way.

[0074] [Figure 1A] This shows a known foldable telephoto camera. [Figure 1B] A known mobile device, having an external surface and including the known foldable telephoto camera shown in Figure 1A, is schematically represented. [Figure 1C] This shows another known foldable telephoto camera. [Figure 1D] Another known mobile device, which has an external surface and includes the known foldable telephoto camera shown in Figure 1C, is schematically represented. [Figure 2A] An example of a foldable telephoto camera refractive lens optical system disclosed herein is shown. [Figure 2B] Another example of a foldable telephoto camera refractive lens optical system disclosed herein is shown. [Figure 3] An example of a foldable telephoto camera hybrid lens optical system disclosed herein is shown. [Figure 4] Another example of a foldable telephoto camera hybrid lens optical system disclosed herein is shown. [Figure 5] Here is yet another example of a foldable telephoto camera hybrid lens optical system disclosed herein. [Figure 6] Here is yet another example of a foldable telephoto camera hybrid lens optical system disclosed herein. [Figure 7] Here is yet another example of a foldable telephoto camera hybrid lens optical system disclosed herein. [Figure 8] Here is yet another example of a foldable telephoto camera hybrid lens optical system disclosed herein. [Modes for carrying out the invention]

[0075] The following detailed description includes numerous specific details to provide a complete understanding. However, those skilled in the art will understand that the subject matter disclosed herein can be implemented without these specific details. In other instances, well-known methods and features are not described in detail so as not to obscure the subject matter of this disclosure.

[0076] All optical lens systems disclosed herein can be used in (or incorporated into) known foldable cameras such as foldable camera 100 or foldable camera 130, and the resulting camera can be used in mobile devices such as mobile device 120 or mobile device 150. For clarity, all examples of optical lens systems disclosed herein are useful for use in smartphones, tablets, etc. The values ​​and dimensions of cameras and mobile devices including the optical lens systems disclosed herein are shown in Table 1. Table 1 uses the definitions and descriptions shown in Figures 1A-D.

[0077] "N" indicates the number of lens elements in the lens. "M" indicates the number of metalensing elements in the lens. "ML position" indicates the location within the lens where the metalens is located. f M1 This indicates the focal length (in mm) of the first metalens element included in the lens. f M2 This indicates the focal length (in mm) of the second metalens element included in the lens. "Type" indicates whether the optical lens system is a conventional lens (containing only glass and / or plastic lens elements) or a hybrid lens (containing glass and / or plastic lens elements plus at least one metalens element). SD stands for the (full) sensor diagonal (in millimeters) of the image sensor. "35mm EqFL" indicates the 35mm equivalent focal length of the optical system. "DA" indicates the aperture diameter (in millimeters). The (diagonal) field of view ("FOV") is given in degrees. "H L " indicates the height (or thickness) of the lens as defined in Figures 1A and 1C (in mm). L (200) refers to the (reference) lens height of Example 200. H L =TTL1-BFL1 MH M ,MH S , ML M H M H S , L M This is defined above and given in millimeters.

[0078] [Table 1]

[0079] Figure 2A shows an example of an optical lens system disclosed herein and numbered 200. The optical lens system 200 includes a lens that does not include a conventional (or "refracting") lens, i.e., a metalens. The optical lens system 200 comprises a lens 202 having a plurality of N lens elements (here N=4) numbered L1 to L4, with L1 oriented toward the subject. The optical lens system 200 further comprises an OPFE 204 that bends a first OP 208 into a second OP 210, an image sensor 206, and an (optional) optical element 212, such as an IR filter. In the optical lens system 200, the OP 208 is substantially parallel to the y-axis, and the OP 210 is substantially parallel to the z-axis. The lens optical axis of the lens 202 is oriented parallel to the OP 208. The OPFE 204 forms a 45-degree angle with both the y-axis and the z-axis. Here, OPFE 204 is a mirror.

[0080] Lens 202 is positioned on the subject side of OPFE 204. The TTL and BFL of camera 200 are oriented along two axes. The first part, TTL1 and BFL1 respectively, is parallel to OP 208, and the second part, TTL2 and BFL2 respectively, is parallel to OP 210. TTL = TTL1 + TTL2, BFL = BFL1 + BFL2, and TTL2 = BFL2. Lens height H of lens 202 L H L = TTL1 - BFL1 is given. The light rays pass through lens 202, are reflected by mirror 204, and form an image on image sensor 206. Figure 2 shows three fields, each having six light rays. This also applies to all further optical lens systems disclosed herein.

[0081] MH M Note that the value of depends on (i) the position (or location) of the OPFE 204 with respect to the y axis, and (ii) the amount of light rays entering the camera 200. For (i), the position of the OPFE 204 can be changed by increasing or decreasing ΔLO. Here, ΔLO = 0.65 mm, and MH M = 11.2 mm. In other examples, ΔLO may be in the range of ΔLO = 0.05 mm to 2 mm, and as a result, MH M =10.6mm~12.55mm. TTL does not change, ML M The same changes accordingly. For (ii), the height of the mirror 204 may be defined to include all on-axis rays, i.e., the mirror 204 may have a lower limit marked "on-axis". In other examples, the height of the mirror 204 may also be defined to include all off-axis rays, i.e., the mirror 204 may have a lower limit marked "off-axis". For the image sensor 206, SD = 10.2 mm. This is relatively large compared to commonly used image sensors, for example, SD = 5.3 mm (1 / 3″ image sensor). Larger image sensors are beneficial for achieving high image quality. All optical lens systems disclosed herein have a given EFL and a given H Mincorporates a relatively large image sensor. That is, all the optical lens systems disclosed in this specification have a relatively large ratio of SD / EFL and SD / H M , for example, achieving SD / EFL > 0.4 and 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, EFL may be within the range of 8 mm < EFL < 50 mm.

[0082] The lens 202 includes a plurality of N lens elements L i (where "i" is an integer from 1 to N). L1 is the lens element closest to the subject side, and L N is the lens element closest to the image side, that is, the side where the image sensor is located. This order applies to all the lenses and lens elements disclosed in this specification. The N lens elements are axially symmetric along an optical (lens) axis parallel to OP 208. Each lens element L i has its respective front surface S 2i-1 (the subscript "2i - 1" is the number of the front surface) and its respective rear surface S 2i (the subscript "2i" is the number of the rear surface), where "i" is an integer between 1 and N. This numbering convention is used throughout the description. Alternatively, as done throughout this description, the lens surfaces are marked "S k ", and k varies from 1 to 2N. The front and rear surfaces may be aspherical in some cases. However, it is not limited to this.

[0083] As used in this specification, the term "front surface" of each lens element refers to the surface of the lens element located closer to the entrance of the camera (camera subject side), and the term "rear surface" refers to the surface of the lens element located closer to the image sensor (camera image side).

[0084] Detailed optical and surface data for the lens element example in Figure 2A are shown in Tables 2-3. The values ​​provided for these examples are purely illustrative, and other values ​​may be used depending on other examples.

[0085] Surface types are defined in Table 2. Surface coefficients are defined in Table 3. The surface types are as follows:

[0086] a) Plano: A flat surface, without curvature. b) Q-type 1 (QT1) Surface sag type:

number

number

[0087] [Table 2]

[0088] [Table 3-1]

[0089] [Table 3-2]

[0090] Note that in this specification, optical lens system 200 is shown as a “folded optical lens system,” meaning that optical lens system 200 is shown to include an OPFE 204 and two optical paths OP 208 and OP 210 perpendicular to each other. Hybrid lens systems 300, 400, 500, 600, 700, and 800 disclosed herein are not shown as folded optical lens systems; that is, they are shown without their respective OPFEs and without showing two optical paths perpendicular to each other. However, note that it is also beneficial to use all hybrid optical lens systems disclosed herein as folded optical lens systems. All values ​​and dimensions of hybrid optical lens systems disclosed herein are derived by referring to optical lens system 200. For example, the H of optical lens systems 300, 400, 500, 600, 700, and 800 M To estimate this, BFL1 is kept constant (relative to optical lens system 200), and as a result, lower H values ​​are obtained for optical lens systems 300, 400, 500, 600, 700 and 800. L Lower H M Assuming it is converted to this, this is beneficial for slim mobile devices. Since TTL does not change, lower H of optical lens systems 300, 400, 500, 600, 700, and 800 L is by the same amount larger in ML M It will be converted.

[0091] In some examples, lens 202 may be cut to achieve a cut lens based on lens 202. A cut lens may be obtained by cutting 10% to 40% of the width or length of the lens element of lens 202. The width or length cutting is performed along a direction parallel to the optical axis of the lens (i.e., parallel to the y-axis), and as a result the width of lens 202 measured along the x-direction ("W") L The length of lens 202 ("L") measured along the y direction is the length of lens 202 ("L")L Smaller than '', that is, W L <L L The cutting of lens 202 is MH M This leads to significant savings in this respect, which is beneficial for slim mobile device designs. For example, by cutting lens 202 by only 20%, H M and MH M This can be reduced by only 10-20%.

[0092] OPFE 204 forms a 45-degree angle with both the y-axis and the z-axis. In other examples, OPFE 204 can form an inclination angle with respect to the y-axis, i.e., OP 208, in the range of 45 < β ≤ 65 degrees.

[0093] Each of L2, L3, and L4 has a relatively thin lens element thickness, i.e., T i and the minimum lens element radius (D / 2) of the two lens element surfaces. i The ratio to is given by T for each of L2, L3, and L4. i (D / 2) i It satisfies <0.3. L3 is T i (D / 2) i Satisfying <0.25. T i This is measured at position OP 208. The image-side surface of L4 is S8. S8 has a relatively small diameter D8, and the ratio of D8 to DA satisfies DA / D8 = 1.42. L2 is a meniscus shape convex toward the subject, and both the front and rear surfaces of L2 are formed convex toward the subject. L1 is relatively thin, i.e., the thickness of L1 is T1 and the lens height H L is the ratio T1 / H L The condition <0.3 is satisfied. Here, T1 / H L = 0.23. L1, L2, and L2, L3 are very close to each other. Here, and below, the optical axis 208 and L i or L i+1 L measured along the y-axis at a position along the z-axis between the diameter and radius i and L i+1 The closest gap (or distance) between them "G i " is G iIf <0.2mm, a pair of continuous lens elements L i , L i+1 These points are "very close to each other". G1 = 0.037 mm (between L1 and L2) is located at optical axis 208, while G2 is not located at optical axis 208.

[0094] Figure 2B schematically shows an example of an optical lens system disclosed herein and numbered 250. Optical lens system 250 includes a conventional (refractory) lens. Lens system 250 may be included in a folded camera having an inclined OP as shown in Figures 1C-D. Lens system 250 comprises a lens 252, a mirror 254, an optical element 262 (optional), and an image sensor 256. Lens 252 includes four lens elements numbered L1-L4. Lens system 250 has a first optical path OP1 258 and a second optical path OP2 260. Lens 252 is parallel to OP1 258 and has an optical lens axis parallel to the y-axis. OP2 260 is oriented perpendicular to the image sensor 256. Surface types are defined in Table 4. Surface thicknesses for the mirror are given with respect to OP1 258 and OP2 260, respectively. The surface coefficients are defined in Table 5. The radius (D / 2) of mirror 254 is defined by the circle that completely encloses mirror 254. The dimensions of mirror 254 are 5.0 × 5.1 mm. The inclination angle β of mirror 254 with respect to the y-axis is 47.8 degrees. In other examples, the inclination angle β may be in the range of 45 < β ≤ 65 degrees. In yet another example, it is 46 < β ≤ 50 degrees. OP2 260 is not parallel to the z-axis but forms an angle α with the z-axis. The optical lens system 250 has a 4.8 mm H Sensor MH as defined by S It has the mechanical height (MH) of the image sensor 256. Sensor ) is also shown. MH SensorIt is 7.0 mm. ΔLO is 0.58 mm. TTL1 is 7.04 mm, BFL1 is 2.73 mm, TTL2 = BFL2 = 8.29 mm, BFL = 11.02 mm, and TTL = 15.33 mm. The power sequence of the lens elements L1 to L4 is plus - minus - plus - plus. The entrance pupil (or aperture stop or "A.S.") is located behind L4, i.e., on the image side of the lens 252. f1 is positive and f1 / EFL = 0.53. The optical lens system 250 has a relatively low f / # of f / # = 2.4.

[0095] Each of L2, L3, and L4 has a relatively thin lens element thickness, i.e., T i and the ratio to the minimum lens element radius (D / 2) of the two lens element surfaces i for each of L2, L3, and L4 is T i / (D / 2) i <0.25. For each of L2 and L3, the ratio is T i / (D / 2) i <0.2.

[0096] L1 and L2, L2 and L3, and L3 and L4 are very close to each other. G3 = 0.1 mm (between L3 and L4), and G3 is the largest gap between any lens elements, i.e., G1 < G3 and G2 < G3. G3 is located on the optical axis 258. The ratio G3 / H L = 2.2%.

[0097] The distance between L and L3 ("d L1-L3 ") is relatively small, i.e., d L1-L3 <0.75 mm, and the ratio d L1-L3 / H L <0.2. Specifically, d 0000278= 0.63 mm, and d L1-L3 / H L = 0.14. In other words, L2 spreads (or occupies) over a relatively short distance. That G i is small, T i is small, and the distances between lens elements are small are advantageous for a slim camera.

[0098] The image-side face of L4 is S8. S8 has a relatively small diameter D8, and the ratio of D8 to DA satisfies DA / D8 = 1.42.

[0099] L4 is a meniscus shape that is convex towards the subject, with both the front and rear surfaces of L4 being convex towards the subject. S5 and S6 (i.e., both sides of L3) are concave towards the subject and each contains two inflection points. In other examples, lens 252 may be cut to achieve a cut lens based on lens 252.

[0100] [Table 4]

[0101] [Table 5-1]

[0102] [Table 5-2]

[0103] Figure 3 shows another example of an optical lens system disclosed herein and numbered 300. The optical lens system 300 includes a hybrid lens 302, i.e., a lens including at least one metalens element. The lens 302 includes a plurality of N=4 lens elements numbered L1 to L4. The optical lens system 300 further includes an image sensor 306 and (optional) optical elements 312, such as an IR filter. In other examples, the optical lens system 300 may further include an OPFE (not shown) that folds OP1 into OP2 (not shown). OP1 is substantially parallel to the y-axis and OP2 is substantially parallel to the z-axis. The lens optical axis of the lens 302 is oriented parallel to OP1. The OPFE may form a 45-degree angle with both the y-axis and the z-axis.

[0104] Here, L2 is a metalensing element. The metalensing element is manufactured (or placed) on the substrate. In other words, the metalensing element is located on the front side (subject side) of the substrate. This is true for all subsequent metalensing elements. The substrate has a substrate height H Substrate It has H Substrate = 0.2 mm. In other examples, H substrate is 0.05mm <H Substrate It may be within a range of <1 mm. The substrate is made of glass. This applies to all subsequent metalens elements.

[0105] Compared to the standard lens 202 of the optical lens system 300, the hybrid lens 302 of the optical lens system 200 has the same optical characteristics (EFL, SD, DA, etc.) as the camera including the standard lens 202 or the hybrid lens 302, but has a significantly lower HL. Specifically, the H of the hybrid lens 302 L The H of the standard lens 202 L It's 24% lower than that. This indicates that hybrid lenses are beneficial for use in slim mobile cameras.

[0106] L4 is a relatively short distance ("d L4 It extends over ) ). L4 = 0.53 mm, ratio d L4 / H L =0.14. G1 = 0.032 mm and is located at 308 on the optical axis. G2 is not located at 308 on the optical axis. Since G2 = 0.25 mm, L2 and L3 are not very close to each other. This is H L Without needing to significantly increase H Substrate It may be beneficial to use thicker substrates with a thickness of >0.2mm.

[0107] The surface types are defined in Table 6. The coefficients for each surface of the standard lens elements (L1, L3, L4) are defined in Table 7. The phase coefficient of the metalens element (L2) is defined in Table 8. The phase coefficient is used in the binary optics 2 of Zemax (where M is the diffraction order, and M=1 here) by the following polynomial expansion (where coefficient A i It is given according to ).

number

[0108] [Table 6]

[0109] [Table 7-1]

[0110] [Table 7-2]

[0111] [Table 8-1]

[0112] [Table 8-2]

[0113] Figure 4 shows another example of an optical lens system disclosed herein and numbered 400. The optical lens system 400 includes a hybrid lens, where L2 is a metalens element. The optical lens system 400 comprises a lens 402 having a plurality of N lens elements (here N=4) numbered L1 to L4, an image sensor 406, and an (optional) optical element 412. In other examples, the optical lens system 400 may further include an OPFE (not shown) that folds OP1 into OP2 (not shown). The lens optical axis of lens 402 may be oriented parallel to OP1. The OPFE forms a 45-degree angle with both the y and z axes.

[0114] L4 is a relatively short distance ("d L4 It extends over ) ). L4 = 0.48 mm, ratio d L4 / H L =0.12. G1 = 0.02 mm and is located at 408 on the optical axis. G2 = 0.17 mm and is not located at 408 on the optical axis.

[0115] The surface types are defined in Table 9. The coefficients for each surface of the standard lens elements (L1, L3, L4) are defined in Table 10. The phase coefficient for the metalens element (L2) is defined in Table 11.

[0116] [Table 9]

[0117] [Table 10-1]

[0118] [Table 10-2]

[0119] [Table 11-1]

[0120] [Table 11-2]

[0121] Figure 5 shows another example of an optical lens system disclosed herein and numbered 500. The optical lens system 500 includes a hybrid lens, where L4 is a metalens element. The optical lens system 500 comprises a lens 502 having a plurality of N lens elements (here N=4) numbered L1 to L4, an image sensor 506, and an (optional) optical element 512. The optical lens system 500 may further include an OPFE (not shown) that bends OP1 into OP2 (not shown). The lens optical axis of lens 502 may be oriented parallel to OP1. The OPFE forms a 45-degree angle with both the y and z axes. L1 is relatively thin, T1 / H L =0.25. G1 = 0.02 mm and is located at 508 on the optical axis. G3 = 0.03 mm and is located at 508 on the optical axis. Both the front and rear surfaces of L2 are convex relative to the subject. Both the front and rear surfaces of L3 are concave relative to the subject. Surface types are defined in Table 12. The coefficients for each surface of the standard lens elements (L1, L2, L3) are defined in Table 13. The phase coefficient of the metalens element (L4) is defined in Table 14.

[0122] [Table 12]

[0123] [Table 13-1]

[0124] [Table 13-2]

[0125] [Table 14-1]

[0126] [Table 14-2]

[0127] Figure 6 shows another example of an optical lens system disclosed herein and numbered 600. The optical lens system 600 includes a hybrid lens, where L4 is a metalens element. The optical lens system 600 comprises a lens 602 having a plurality of N=4 lens elements numbered L1 to L4, an image sensor 606, and an (optional) optical element 612. The optical lens system 600 may further include an OPFE (not shown) that folds a first OP1 into a second OP2 (not shown). The lens optical axis 608 of the lens 602 is oriented parallel to the OP1. The OPFE forms a 45-degree angle with both the y and z axes.

[0128] G1 = 0.02 mm and is located at 608 on the optical axis. G3 = 0.02 mm and is similarly located at 608 on the optical axis. Both the front and rear surfaces of L2 are convex relative to the subject. L3 is at a relatively short distance ("d L3 It extends over ) ). L3 = 0.5 mm, ratio d L3 / H L = 0.12.

[0129] The surface types are defined in Table 15. The coefficients for each surface of the standard lens elements (L1, L2, L3) are defined in Table 16. The phase coefficient for the metalens element (L4) is defined in Table 17.

[0130] [Table 15]

[0131] [Table 16-1]

[0132]

Table 16-2

[0133]

Table 17-1

[0134]

Table 17-2

[0135] Figure 7 shows another example of an optical lens system disclosed herein and numbered 700. The optical lens system 700 includes a hybrid lens. Here, L2 and L4 are metasurface elements. The optical lens system 700 includes a lens 702 having a plurality of N = 5 lens elements numbered L1 to L5, an image sensor 706, and an (optional) optical element 712. The optical lens system 700 may further include an OPFE (not shown) that folds the first OP1 to a second OP2 (not shown). The lens optical axis of lens 708 is oriented parallel to the first OP1. The OPFE forms an angle of 45 degrees with both the y-axis and the z-axis.

[0136] G1 = 0.04 mm and is located on the optical axis 708. G4 = 0.04 mm (between L4 and L5) and is similarly located on the optical axis 708. Both L3 and L4 have concave shapes on the front and rear surfaces with respect to the subject side. G2 is not located on the optical axis 708. Since G2 = 0.42 mm, L2 and L3 are not very close to each other.

[0137] The surface type is defined in Table 18. Also, the coefficients of each surface of the normal lens elements (L1, L2, L3) are defined in Table 19. The phase coefficients of the metasurface elements (L2, L4) are defined in Table 20.

[0138]

Table 18

[0139] [Table 19-1]

[0140] [Table 19-2]

[0141] [Table 20-1]

[0142] [Table 20-2]

[0143] Figure 8 shows another example of an optical lens system disclosed herein and numbered 800. Optical lens system 800 includes a hybrid lens, where L2 is a metalensing element. The substrate height is H substrate =0.6mm. The optical lens system 800 comprises a lens 802 having a plurality of N=4 lens elements numbered L1 to L4, an image sensor 806, and an (optional) optical element 812. The optical lens system 800 may further comprise an OPFE (not shown) that folds a first OP1 into a second OP2 (not shown). The lens optical axis 808 of the lens 802 may be oriented parallel to OP1. The OPFE forms a 45-degree angle with both the y-axis and the z-axis. G1 = 0.02mm and is located on the optical axis 808. L4 is at a relatively short distance ("d L4 It extends over ) ). L4 = 0.49 mm, ratio d L4 / H L = 0.12.

[0144] The surface type is defined in Table 21. Also, the coefficients of each surface of the normal lens elements (L1, L3, L4) are defined in Table 22. The phase coefficient of the metalens element (L2) is defined in Table 23.

[0145]

Table 21

[0146]

Table 22-1

[0147]

Table 22-2

[0148]

Table 23-1

[0149]

Table 23-2

[0150] In some examples, a normal or hybrid lens such as 202, 252, 302, 402, 502, 602, 702, or 802 may be a cut lens known in the art. Referring to FIGS. 1A and 1C, one or more lens elements may be cut along a direction parallel to the y-axis, such that the lens length L L (「L L 」) measured along the z-direction is smaller than the 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% to 50%, i.e., L L is W LIt can be about 20% to 50% smaller than that. The lens cut is H M This leads to significant savings, which is beneficial for slim mobile device designs. Cutting the lens by 20% is H M This can translate to savings of approximately 10-20%.

[0151] For clarity, it should be understood that certain features of the subject matter of this disclosure, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the subject matter of this disclosure, described in the context of a single example for the sake of brevity, may be provided separately or in any appropriate partial combination.

[0152] Unless otherwise specified, the use of the expression "and / or" between the last two members of a list of options indicates that one or more of the listed options are appropriate and can be chosen.

[0153] If a claim or specification refers to an "a" or "an" element, it should be understood that such reference should not be interpreted as meaning that only one of that element exists.

[0154] All patents and patent applications referenced herein are incorporated herein by reference in whole, as if each individual patent or patent application were specifically and individually incorporated herein by reference. Furthermore, any citation or specification of any reference in this application should not be construed as an admission that such reference is available as prior art to this disclosure.

Claims

1. It is a camera, The lens optical axis OA and N≧4 lens elements L such that 1≦i≦N ｉ A lens having an effective focal length EFL and an F-number f / #, wherein the first lens element L １ The lens element L faces the subject, and the final lens element L Ｎ The lens faces the image side, An image sensor having full sensor diagonal SD, The system includes an optical path bending element OPFE for providing a bent optical path between the subject and the image sensor by bending light from a first optical path OP1 parallel to the lens optical axis OA into a second optical path OP2 perpendicular to the image sensor, The camera is a foldable digital camera and has a total track length TTL, and the lens is located on the subject side of the OPFE and has a lens height H measured along OP1. Ｌ It has H Ｌ A camera having an aperture diaphragm located on the image side of the lens, where / TTL < 0.4, EFL is in the range of 8 mm < EFL < 50 mm, SD / EFL > 0.4, f / # < 2.

75.

2. The camera according to claim 1, wherein f / # < 2.

7.

3. The camera according to claim 1, wherein f / # < 2.

6.

4. The camera according to claim 1, wherein the OPFE is oriented at an angle β with respect to the lens optical axis OA, and 45 < β ≤ 65 degrees.

5. The camera according to claim 4, wherein 46 < β ≤ 50 degrees.

6. Module height H measured along OP1 Ｍ Included in a camera module having SD / H Ｍ The camera according to claim 1, wherein the coefficient is >0.

7.

7. N = 4, and the lens elements L １ ~L ４ have a power sequence of plus - minus - plus - plus. The camera according to claim 1

8. The closest gap G between all pairs of consecutive lens elements is less than 0.2 mm, and the ratio G / H is for all pairs of consecutive lens elements. Ｌ The camera according to claim 1, satisfying 5%.

9. L １ and L ３ The distance between (d Ｌ１－Ｌ３ ) is d Ｌ１－Ｌ３ < 0.75 mm satisfies ratio d Ｌ１－Ｌ３ / H Ｌ The camera according to claim 1, satisfying the condition <0.

2.

10. The camera according to claim 1, wherein TTL / EFL < 1.

05.

11. H Ｌ The camera according to claim 1, wherein TTL < 0.

35.

12. L ４ The front and L ４ The rear surface of each is formed in a convex shape toward the subject side, as described in claim 1.

13. The camera according to claim 1, wherein the EFL is within the range of 10 mm < EFL < 20 mm.

14. The camera according to claim 1, wherein the SD is within the range of 5 mm < SD < 10 mm.

15. The camera according to claim 1, wherein all lens elements are made of plastic.

16. Module height H measured along OP1 Ｍ Included in a camera module having 7.5 mm < H Ｍ The camera according to claim 1, wherein the lens is 15mm.

17. 9mm < H Ｍ The camera according to claim 16, wherein the lens is 12 mm.

18. The camera is a camera included in a mobile device, as described in any one of claims 1 to 17.

19. The camera according to claim 18, wherein the mobile device is a smartphone.

Images