Camera module and mobile device

Abstract

The invention relates to a camera module and a mobile device. In some embodiments, disclosed is a folded camera module comprising: a lens having N = 6 lens elements Li divided into a first lens group G1 and a second lens group G2 and having an effective focal length EFL; an object side optical path folding element O-OPFE; an image side optical path folding element I-OPFE; and an image sensor. Wherein G1 is located at the object side of the O-OPFE and G2 is located at the image side of the O-OPFE, with 8 mmlt; eFLlt, EFLlt; the camera module is divided into a first region and a second region, the first region having a minimum camera module region height MHM and comprising G1 and O-OPFE, and the second region having a minimum shoulder region height MHSlt; mHM and comprising I-OPFE and an image sensor wherein the aperture height of the lens is HL and wherein HL / MHSgt; and 0.9. In some embodiments, a folded camera module is disclosed that includes a lens having N = 4 lens elements and having a lens thickness TLens and an overall optical length TTL, I-OPFE and O-OPFE, where EFL is 8 mmlt; eFLlt, EFLlt; in the range of 50 mm, and wherein TLens / TTLlt; and 0.4 part.

Description

[0001] This application is a divisional application of the Chinese patent application with the application date of October 23, 2022, application number 202280007469.0, and invention name “Compact dual-folding telephoto camera”. Technical Field

[0002] The subject matter of the present disclosure relates generally to the field of digital cameras, and in particular, to foldable digital cameras for use in mobile electronic devices such as smartphones.

[0003] definition

[0004] In this application, for optical and other properties referred to throughout the specification and drawings, the following symbols and abbreviations are used, all of which are terms known in the art:

[0005] Lens element: a single lens element.

[0006] Lens: An assembly of multiple lens elements.

[0007] Total track length (TTL): The optical length between the first lens element L and the 1 The front surface S 1 The maximum distance between a point on the image sensor and the image sensor measured along an axis parallel to the optical axis of the lens.

[0008] Back Focal Length (BFL): The distance from the last lens element L to the nearest lens element when the system is focused to an infinite object distance. N The rear surface S 2N The minimum distance between a point on the image sensor and the image sensor measured along an axis parallel to the optical axis of the lens.

[0009] Effective focal length (EFL): The focal length of the lens (lens element L 1 To L N The distance between the rear principal point P' and the rear focal point F' of the lens in a component).

[0010] f-number (f / #): The ratio of the EFL of a lens to the entrance pupil diameter. Background Art

[0011] Multi-aperture cameras (or "multi-cameras", with a "dual camera" having two cameras being an example) are now standard for portable electronic mobile devices ("mobile devices", such as smartphones, tablets, etc.). Multi-camera setups typically include a wide field of view (or "angle") FOVW camera (a Wide camera or "W" camera) and at least one additional camera (e.g., with a narrower (than FOV W Cameras with narrow FOV T Telephoto camera or "Tele" camera).

[0012] Figure 1A The folded telephoto camera 100 is shown as an example, and includes an optical path folding element (OPFE) 102, a lens 104, a lens barrel 110, and an image sensor 106. The lens 104 includes N=4 lens elements L 1 -L 4 , the lens 104 is included in the lens barrel 110. The lens 104 has an optical lens height H measured along OP 112. L .H L The lens 104 may include one or more cut lens elements L. i (See Figure 1D ). OPFE 102 folds the optical path (OP) from a first OP 112 (in the z direction) to a second OP 108 parallel to the optical axis of lens 104 along the y-axis in the coordinate system shown. Lens 104 is located at the image side of OPFE 102. Both the TTL and BFL of camera 100 are oriented along a dimension parallel to OP 108 (in this case, the y-axis). Theoretical limits (“minimum module height” or “MH”) on the height of a camera module that includes camera 100 are shown. M ”).MH M Defined by the maximum dimension of the components included in the camera 100 along OP 112. L Influenced by MH M The restriction, that is, H L <MH M .

[0013] Figure 1B A known dual camera 150 is shown, which includes a folded telephoto camera 100 and a (vertical or upright) wide-angle camera 130, which includes a wide-angle lens 132 and a wide-angle image sensor 138. The lens 132 is included in a lens barrel 134. The wide-angle camera 130 has an OP 136 that is substantially parallel to the OP 112.

[0014] Figure 1CAn example of a known double-folded camera, referenced 160, is shown in cross-section. Camera 160 includes a first object-side OPFE ("O-OPFE", e.g., a prism) 162, a lens 164 including a plurality of lens elements, a second image-side OPFE ("I-OPFE" - e.g., a mirror) 166, and an image sensor 168. The optical path of camera 160 is folded twice, from a first OP 172 substantially parallel to the y-axis in the XYZ coordinate system shown, to a second OP 174 substantially parallel to the x-axis, and to a third OP 176 substantially parallel to the y-axis. Image sensor 168 is oriented in a plane parallel to the xz plane. O-OPFE 162 and I-OPFE 166 are oriented at 45 degree angles relative to OP 172 and OP 174.

[0015] Figure 1D A known cut lens element 180 is shown in cross-section. The lens element 180 may define an aperture of an optical lens system including the lens element 180. The lens element 180 is cut by 20%, i.e., its optical width W L Than its optical height H L 20% larger. This means that the aperture of the optical lens system also changes accordingly, making the aperture not axisymmetric. Cutting allows small H L , which is good for small MH M (See Figure 1A ) is required, and also allows DA>H L A relatively large effective aperture diameter (DA) of the lens. As mentioned above, f / # = EFL / DA. As is known, a low f / # is desirable because it has 3 main advantages: good low light sensitivity, a strong "natural" Bokeh effect, and high image resolution.

[0016] It should be noted here that "aperture" refers to the entrance pupil of a lens (or "lens assembly"). If "the aperture of a camera" or "the aperture of an optical lens system" is referred to, this always refers to the aperture of the lens included in the camera or optical lens system, respectively. "Aperture" and "clear aperture" are used interchangeably. Typically, in mobile electronic devices (or just "mobile devices") such as smartphones, dual-folded cameras such as the 160 include a relatively small image sensor with an SD of about 5mm to 7mm, and a relatively small H aperture of about 4mm to 5mm. L , resulting in a relatively large f / # of about 3 to 6 and a relatively small H L / H M The ratio of H M is the height of a camera module including a dual folded camera such as 160, H MIt can be about 5 mm to 15 mm. Through H M = MH M + height penalty (“penalty”) relates H M to the minimum module height (“MH M ”, see Figure 1A ), and this penalty is about 1 mm to 2 mm.

[0017] Advantageously, there is a mobile device - compatible dual - folding telephoto camera, which includes a large image sensor and provides a large DA to achieve a large H L / MH M ratio, while allowing a low f / # and a thin camera design. SUMMARY OF THE INVENTION

[0018] In various exemplary embodiments, a camera module is provided, including: a lens having N = 6 lens elements L i , and the 6 lens elements L i are divided into a first lens group (G1) and a second lens group (G2), and the lens has an effective focal length EFL, an aperture diameter DA, an f - number f / #, an optical total length TTL, and a back focal length BFL, where each lens element has its own focal length f i , and where the first lens element L 1 faces the object side, and the last lens element L N faces the image side; an object - side optical path folding element O - OPFE for folding a first optical path (OP1) to a second optical path (OP2); an image - side optical path folding element I - OPFE for folding OP2 into a third optical path (OP3), where OP1 and OP2 are perpendicular to each other, and where OP1 and OP3 are parallel to each other; and an image sensor having a sensor diagonal (SD). The camera module is a folding digital camera module, where G1 is located on the object side of O - OPFE and G2 is located on the image side of O - OPFE, where EFL is in the range of 8 mm < EFL < 50 mm, where the camera module is divided into a first region and a second region, the first region has a minimum camera module region height MH M and includes G1 and O - OPFE, the second region has a minimum shoulder region height MH S < MH M and includes I - OPFE and the image sensor, where all heights are measured along OP1, where the aperture height of the lens is H L , and where H L / MH S > 0.9.

[0019] In some examples, H L / MHS > 1. In some examples, H L / MH S > 1.05. In some examples, H L / MH S > 1.1.

[0020] In some examples, EFL > 1.1·ML M . In some examples, EFL > 1.2·ML M . In some examples, EFL > 1.3·ML M .

[0021] In some examples, 5 mm < SD < 15 mm.

[0022] In some examples, SD / EFL > 0.3. In some examples, SD / EFL > 0.35. In some examples, SD / EFL > 0.4.

[0023] In some examples, the optical width W of the lens L and the optical height H of the lens L satisfy the ratio of W L / H L > 1.1. In some examples, W L / H L > 1.2.

[0024] In some examples, EFL / TTL < 1.2.

[0025] In some examples, BFL / EFL > 0.25. In some examples, BFL / TTL > 0.3.

[0026] In some examples, 15 mm < EFL < 40 mm. In some examples, 20 mm < EFL < 30 mm.

[0027] In some examples, 5 mm < DA < 15 mm, and 2 < f / # < 6.5. In some examples, 6 mm < DA < 10 mm and 2.5 < f / # < 4.5.

[0028] In some examples, G1, O-OPFE, and G2 are movable together with I-OPFE and the image sensor along OP2 for focusing.

[0029] In some examples, G1, O-OPFE, G2, and I-OPFE are movable together with the image sensor along OP2 for optical image stabilization (OIS) about the first OIS axis.

[0030] In some examples, G1 , O-OPFE, and G2 are movable together along OP2 relative to the image sensor for OIS about a first OIS axis.

[0031] In some examples, G1 , O-OPFE, G2 , and I-OPFE are movable together relative to the image sensor along an axis perpendicular to both OP1 and OP2 for OIS about a second OIS axis.

[0032] In some examples, G1 , O-OPFE, and G2 are movable together along OP2 relative to the image sensor for OIS about a second OIS axis.

[0033] In some examples, the first area of ​​the camera module has a module area height H M The second area of ​​the camera module has a shoulder area height H S , and H M >H S In some examples, 4 mm <H S <10mm and 6mm <H M <13mm. In some examples, 6mm <H S <8mm and 7mm <H M <11mm.

[0034] In some examples, H S / H M <0.9. In some examples, H S / H M <0.8.

[0035] In some examples, TTL is used with all lens elements L 1 To L N The ratio of the average lens thickness (ALT) of L satisfies ALT / TTL<0.05. 1 The ratio of thickness (T1) and ALT satisfies T1 / ALT>2.

[0036] In some examples, L 5 With L 6 The distance between 5-6 and ALT meets d 5-6 / ALT>1.2.

[0037] In some examples, L 1 Made of glass.

[0038] In some examples, EFL and L 1 The ratio of f1 satisfies f1 / EFL<0.75.

[0039] In some examples, EFL and L6 The ratio of |f6| satisfies |f6| / EFL>0.75.

[0040] In some examples, the last lens element L N It is negative.

[0041] In some examples, G1 has a thickness T-G1 and T-G1 / TTL<0.1.

[0042] In some examples, G2 has a thickness T-G2 and T-G2 / TTL<0.1.

[0043] In some examples, G1 is a cut lens cut along an axis parallel to OP1.

[0044] In some examples, G1 is cut by 20%, and M H The axially symmetric lens group has the same lens diameter as the diameter of the cut G1 measured along an axis perpendicular to both OP1 and OP2, relative to the axially symmetric lens group which is reduced by >10% by said cutting.

[0045] In some examples, the O-OPFE and / or the I-OPFE is a reflector.

[0046] In some examples, G2 is a cut lens cut along an axis parallel to OP2.

[0047] In some examples, G2 is cut by 20% and has a cut lens diameter, and M H The axially symmetric lens has a lens diameter that is the same as the diameter of the cut lens measured along an axis perpendicular to both OP1 and OP2, relative to the axially symmetric lens being reduced by >10% by said cutting.

[0048] In some examples, the camera module does not include an I-OPFE.

[0049] In some examples, OP1 and OP3 are perpendicular to each other.

[0050] In various exemplary embodiments, a mobile device including a camera module as described above is provided, wherein the mobile device has a device thickness T and a camera raised area, wherein the raised area has an elevated height T+B, wherein a first area of ​​the camera module is incorporated into the camera raised area, and wherein a second area of ​​the camera module is not incorporated into the camera raised area.

[0051] In some examples, the first area of ​​the camera includes a camera module lens, and wherein the second area of ​​the camera includes a camera module image sensor.

[0052] In various exemplary embodiments, there is provided a lens having N=4 lens elements Li and has a lens thickness T Lens , EFL, aperture diameter DA, f / #, TTL, and BFL, where each lens element has its own focal length f i , and wherein the first lens element L 1 faces the object side, and the last lens element L N faces the image side; O - OPFE for folding the first optical path (OP1) into the second optical path (OP2); I - OPFE for folding OP2 into the third optical path (OP3), where OP1 and OP2 are perpendicular to each other and where OP1 and OP3 are parallel to each other; and an image sensor having a sensor diagonal SD. The camera module is a folded digital camera module, where the lens is located on the object side of the O - OPFE, where, EFL is in the range of 8mm < EFL < 50mm, and where the ratio between the lens thickness T Lens and TTL satisfies T Lens / TTL < 0.4.

[0053] In some examples, T Lens / TTL < 0.3. In some examples, T Lens / TTL < 0.25.

[0054] In some examples, the camera module is divided into a first region and a second region, the first region having a minimum camera module region height MH M and including the lens and the O - OPFE, the second region having a minimum shoulder region height MH S < MH M and including the I - OPFE and the image sensor, the camera module having a minimum camera module length ML M , where all heights are measured along OP1, where the length is measured along OP2, where the aperture height of the lens is H L , and where H L > MH S - 1.5mm.

[0055] In some examples, H L > MH S - 1mm.

[0056] In some examples, H L > 0.8·MH S . In some examples, H L > 0.9·MH S . In some examples, H L > MH S .

[0057] In some examples, EFL > 1.1·ML MIn some examples, EFL>1.2·ML M In some examples, EFL>1.3·ML M .

[0058] In some examples, TTL>1.2·ML M In some examples, TTL>1.3·ML M In some examples, TTL>1.4·ML M .

[0059] In some examples, the lens and O-OPFE are movable along OP2 relative to the I-OPFE and image sensor for focusing.

[0060] In some examples, the lens is movable along OP1 relative to the O-OPFE, I-OPFE, and image sensor for focusing.

[0061] In some examples, the lens, O-OPFE, and I-OPFE are movable together along OP2 relative to the image sensor for OIS about a first OIS axis.

[0062] In some examples, the lens is movable along OP2 relative to the O-OPFE, I-OPFE, and image sensor for OIS about a first OIS axis.

[0063] In some examples, the lens, O-OPFE, and I-OPFE are movable together relative to the image sensor along an axis perpendicular to both OP1 and OP2 for OIS about a second OIS axis.

[0064] In some examples, the lens is movable relative to the O-OPFE, I-OPFE, and image sensor along an axis perpendicular to both OP1 and OP2 for OIS about a second OIS axis.

[0065] In some examples, L 1 Made of glass and has a refractive index n of n>1.7.

[0066] In some examples, f1 <EFL / 2。

[0067] In some examples, lens element L 1 To L 4 The sequence of focal powers is positive-negative-positive-positive. In some examples, lens element L 1 To L 4 The sequence of focal powers is positive-negative-positive-negative. In some examples, lens element L 1 To L 4 The sequence of focal lengths is positive-negative-negative-positive. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] Non-limiting examples of embodiments (or "examples") disclosed herein are described below with reference to the drawings listed following this paragraph. The drawings and descriptions are intended to illustrate and clarify the embodiments disclosed herein and should not be considered limiting in any way.

[0069] Figure 1A A known folded telephoto camera is shown;

[0070] Figure 1B A known dual camera is shown;

[0071] Figure 1C A known double-folded telephoto camera is schematically shown;

[0072] Figure 1D shows a cross-sectional view of a known cut lens element;

[0073] Figure 2A Schematically illustrating an embodiment of a dual-folded telephoto camera module disclosed herein;

[0074] Figure 2B Schematically showing a device having an outer surface and including Figure 2A A cross-sectional view of a mobile device with a dual folded telephoto camera is shown;

[0075] Figure 2C Schematically illustrating an embodiment of a 1G dual-folded telephoto camera module disclosed herein;

[0076] Figure 2D The schematic diagram shows the Figure 2C A cutaway view of a mobile device with dual folded telephoto cameras;

[0077] Figure 3A shows a cross-sectional view of an embodiment of an optical lens system disclosed herein;

[0078] Figure 3B shows a cross-sectional view of another embodiment of the optical lens system disclosed herein;

[0079] Figure 3C A cross-sectional view showing yet another embodiment of the optical lens system disclosed herein;

[0080] Figure 3D Shows Figure 3C A perspective view of an embodiment of an optical lens system;

[0081] Figure 3E Shows Figure 3C A top view of an embodiment of an optical lens system;

[0082] Figure 4shows a cross-sectional view of another embodiment of the optical lens system disclosed herein;

[0083] Figure 5 A cross-sectional view showing yet another embodiment of the optical lens system disclosed herein;

[0084] Figure 6 A cross-sectional view showing yet another embodiment of the optical lens system disclosed herein;

[0085] Fig. 7A A cross-sectional view showing yet another embodiment of the optical lens system disclosed herein;

[0086] Figure 7B Shows Fig. 7A A side view of a prism of an optical lens system;

[0087] Figure 7C Shows Fig. 7A A perspective view of a prism of an optical lens system;

[0088] Fig. 8A Schematically illustrating a method disclosed herein for adjusting focus (or "auto focus" or "AF") in an optical lens system;

[0089] Figure 8B Schematically illustrating a method disclosed herein for performing optical image stabilization (OIS) in a first OIS direction for an optical lens system;

[0090] Figure 8C A method for performing OIS in a second OIS direction for an optical lens system disclosed herein is schematically illustrated. DETAILED DESCRIPTION

[0091] In the detailed description below, many specific details are set forth to provide a thorough understanding. However, those skilled in the art will appreciate that the subject matter currently disclosed can be practiced without these specific details. In other cases, well-known methods and features are not described in detail to avoid obscuring the subject matter currently disclosed.

[0092] Figure 2A An embodiment of a "2-group" (or "2G") dual-folded telephoto camera module disclosed herein and referenced 200 is schematically shown. The camera module 200 includes a plurality of cameras having a plurality of cameras referenced L. 1 To L N The lens 202 has a plurality of (N) lens elements (here and for example, N=5), where L 1oriented toward the object side. The camera module 200 also includes an O-OPFE 204 for folding the first optical path OP1 212 into a second optical path OP2 214, an I-OPFE 206 for folding OP2 into a third optical path OP3 216, and an image sensor 208. As shown, the camera elements may be included in a module housing 220. In the camera 200, OP1 212 is substantially parallel to the z-axis, OP2 214 is substantially parallel to the y-axis, and OP3 216 is substantially parallel to the z-axis. The O-OPFE 204 and the I-OPFE 206 form a 45 degree angle with both the y-axis and the z-axis. The image sensor 208 is oriented in a plane perpendicular to the z-axis in the coordinate system shown.

[0093] In other examples, a camera module such as camera module 200 may not be a dual-folded telephoto camera module, but rather a (single) folded telephoto camera module. That is, the camera module may not have OP3, and may not include an I-OPFE such as I-OPFE 206. In these other examples, OP1 may be oriented perpendicular to OP2 (as shown), and an image sensor such as image sensor 208 may be oriented in a plane perpendicular to the y-axis in the coordinate system shown.

[0094] In other examples, a camera module such as camera module 200 may be a double-folded telephoto camera module, but OP3 may be perpendicular to OP1 (not parallel to OP1, as shown). In these other examples, OP1 may be parallel to the z-axis, OP2 may be parallel to the y-axis (as shown), and OP3 may be perpendicular to the yz coordinate system shown. An image sensor such as image sensor 208 may be oriented in a plane parallel to the yz coordinate system shown.

[0095] The lens 202 is divided into a first lens group ("G1") and a second lens group ("G2"), labeled 202-G1 and 202-G2. G1 is located on the object side of the O-OPFE 204, and G2 is located on the image side of the O-OPFE 204 and the object side of the I-OPFE 206.

[0096] The camera module 200 is divided into a first "module" area and a second "shoulder" area. The first "module" area includes 202-G1 and O-OPFE 204 and has a module area height H M and minimum module region length MRL M (As shown), the second "shoulder" region includes the I-OPFE 206 and the image sensor 208 and has a shoulder region height H S <H M And shoulder area length L S . All heights are measured along OP1 212 and all lengths are measured along OP2 214 .

[0097] Lens element L 1 The optical height and optical width of the camera 200 may define an aperture (having a diameter DA) such that the lens element L 1 The optical height and optical width of the lens element L are also represented by the aperture height and aperture width, respectively. 1 Height H L1 This fact and further design considerations disclosed herein allow for the realization of optical systems that provide low f / # and large EFL (i.e., high zoom factor) because they have compact size or dimension dimensions. This is expressed in the following two favorable values ​​and ratios (see Table 1):

[0098] 1. Optical height H L , which is greater than the minimum shoulder height MH S 90% of H L >0.9·MH S , or even

[0099] H L >MH S ;

[0100] 2. EFL, which is 10% (or 20%, or even 30%) larger than the minimum module length, EFL>1.1·ML M .

[0101] As shown, the TTL of the camera module 200 is divided into three parts: TTL1 to TTL3. The BFL of the camera module 200 is divided into two parts: BFL1 and BFL2. The first part TTL1 is parallel to OP1 212, the second part TTL2 and the first part BFL1 are parallel to OP2 214, and the third part TTL3 and the second part BFL2 are parallel to OP3 216. TTL and BFL are obtained by TTL=TTL1+TTL2+TTL3 and BFL=BFL1+BFL2, respectively.

[0102] To estimate the theoretical limit of the minimum size of a camera module including the optical lens system disclosed herein, we introduce the following parameters and correlations. "Theoretical limit" refers to the optical operating area considering only the components included in the optical lens system disclosed herein.

[0103] Minimum module region length MRL M

[0104] -MRL M It has a height H M The theoretical module area length limit of the module area 222. MRL M

[0105] Defined by the physical dimensions of the components included in the module area 222 .

[0106] -For 200,MRL M =H G1 , that is, the height of G1 (measured along the y-axis) represents the MRL M The lower limit of .

[0107] Shoulder area length L S

[0108] - With height H S The length of the shoulder region 224.

[0109] -From ML S To achieve the camera shoulder length ("L S ”), a length of, for example, 3.5 mm can be added to ML S , that is, L S =ML S +3.5mm. This additional length takes into account the travel that may be required for AF and / or OIS as well as image sensor packaging, external body, etc. Note that

[0110] The value of 3.5 mm is exemplary and by no means limiting, and additional values ​​may be present at 1.5 mm.

[0111] Varies between 1 and 10 mm.

[0112] - Generally, from an industrial design point of view, making L S Maximize (make ML M Minimizing) may be beneficial.

[0113] Minimum module height ("MH M ”) and module height H M

[0114] -MH M It has a height H M Theoretical module height limit of module area 222 - MH M =H OPFE +ΔLO+T G1 , H OPFE is the height of the O-OPFE 204 in a direction parallel to the OP1 112 (the O-OPFE 204 is oriented at 45 degrees relative to both the y-axis and the z-axis, such that H OPFE =WOPFE) WOPFE is the width of O-OPFE in the direction parallel to OP2 214, ΔLO is the distance between the center of G1 and O-OPFE 204, and T G1 is the height (or thickness) of G1.

[0115] - To achieve a realistic estimate of the camera module height, we add an additional height constraint of 1.5mm to the MH M To calculate HM , that is, H M =MH M +1.5mm. This constraint takes into account possible movement of optical image stabilization (OIS), autofocus (AF), and housing, lens cover, etc.

[0116] Note that the value of 1.5 mm is exemplary rather than limiting, and that the additional value may vary between 0.5 mm and 3 mm.

[0117] Minimum module length ("ML M ”)

[0118] -ML M It has a height H M The theoretical module length limit of the module housing 220.

[0119] ML M =MRL M +ML S .

[0120] - In order to achieve the camera module length ("L M ”) can be estimated by adding, for example, 3.5 mm to ML M , that is, L M =ML M +3.5mm.

[0121] Minimum shoulder height ("MH S ”) and shoulder height H S

[0122] -MH S It has a height H S The theoretical shoulder height limit of the shoulder area 224.

[0123] -To achieve the shoulder height H S We estimate the actual height by adding an additional height of 1.5 mm to MH S

[0124] Let's calculate H S , that is, H S =MH S +1.5mm.

[0125] - Compared to known folded cameras like camera 100, in camera module 200, image sensor 208 is not oriented parallel to the z-axis, but rather parallel to the y-axis (in the coordinate system shown). Given a particular H S This allows the use of larger image sensors, for example, image sensors with a sensor diagonal (SD) in the range of about 6 mm to 16 mm, since the image sensor size is not limited by the H SLarger image sensors have benefits in terms of camera image quality, for example as measured by the signal-to-noise ratio ("SNR").

[0126] Figure 2B A cross section of a mobile device 230 (e.g., a smartphone) is schematically shown having an outer front surface 232 and an outer rear surface 234, the outer rear surface 234 including a 2G dual folded telephoto camera 200. The aperture of the camera 200 is located at the rear surface 234. The front surface 232 may, for example, include a screen (not visible). The mobile device 230 has a first "regular" area 236 having a thickness ("T") and a second "raised" area 238 that is raised (protrudes outward) by a height B above the regular area 236. The raised area has a bump length ("BL") and a raised thickness T+B. The module area 222 of the camera 200 is included in the raised area 238. The shoulder area 224 is included in the regular area 236. Optionally, in some embodiments, a portion of the shoulder area 224 may also be included in the raised area 238.

[0127] For industrial design reasons, a small camera bump area (i.e., a short BL) is desired. Known folding cameras such as 100 may be completely contained in the bump area 238. In contrast, the camera 200 (which may only be partially contained in the bump area 238) allows for a smaller camera bump area (i.e., a shorter BL).

[0128] Figure 2C An embodiment of a "1-group" (or "1G") dual-folded telephoto camera module disclosed herein and referenced 250 is schematically shown. The camera module 250 includes a plurality of cameras having a plurality of cameras referenced L. 1 To L N The lens 252 includes a plurality of (N) lens elements (here, for example, N=3), and L 1 oriented toward the object side. The camera module 250 also includes an O-OPFE 254 for folding OP1 262 into OP2 264, an I-OPFE 256 for folding OP2 into OP3 266, and an image sensor 258. The camera elements may be included in a module housing 270. In the camera 250, OP1 262 is substantially parallel to the z-axis, OP2 264 is substantially parallel to the y-axis, and OP3 266 is substantially parallel to the z-axis. The O-OPFE 254 and the I-OPFE 256 may or may not form a 45-degree angle with the y-axis and the z-axis. The lens 252 is entirely located on the object side of the O-OPFE 254. The image sensor 258 is oriented in a plane perpendicular to the z-axis in the coordinate system shown.

[0129] In other examples, a camera module such as camera module 250 may not be a dual-folded telephoto camera module, but rather a (single) folded telephoto camera module. That is, it may not have OP3, and it may not include an I-OPFE, such as I-OPFE 256. In these other examples, OP1 may be oriented perpendicular to OP2 (as shown), and an image sensor (such as image sensor 208) may be oriented in a plane perpendicular to the y-axis in the coordinate system shown.

[0130] In other examples, a camera module such as camera module 250 may be a dual-folded telephoto camera module, but OP3 may be perpendicular to OP1 (not parallel to OP1, as shown). In these other examples, OP1 may be parallel to the z-axis, OP2 may be parallel to the y-axis (as shown), and OP3 may be perpendicular to the yz coordinate system shown. An image sensor such as image sensor 258 may be oriented in a plane parallel to the yz coordinate system shown.

[0131] Lens element L 1 The optical height and optical width of the lens element L can define the aperture of the camera 250. As shown, the lens element L is measured along the y-axis. 1 Height H L1 This fact and further design considerations disclosed herein allow for the realization of optical systems that provide low f / #, large EFL (i.e., high zoom factor), and large TTL because they have compact size or dimension dimensions. Furthermore, the lens thickness is only a relatively small fraction of the TTL. This is expressed in the following four favorable values ​​and ratios (see Table 1):

[0132] 1. Optical height H L , which is greater than the minimum shoulder height MH S 80%, HL>0.8·MH S .

[0133] 2. EFL, which is 10% (or 20%, or even 30%) larger than the minimum module length, EFL>1.1·ML M .

[0134] 3. TTL, which is 20% (or 30%, or even 40%) larger than the minimum module length, TTL>1.2·ML M .

[0135] 4. Lens thickness T Lens Small ratio to the total optical length, T Lens / TTL<0.4(or <0.35, or even

[0136] <0.3).

[0137] The camera module 250 is divided into a module area and a shoulder area, and the module area has a module area height H M The lens 252 and the O-OPFE 254 are included, and the shoulder region has a shoulder region height H S <H M And includes I-OPFE 256 and image sensor 258.

[0138] As shown, the TTL and BFL of the camera module 250 are divided into three parts, namely TTL1 to TTL3 and BFL1 to BFL3, respectively. TTL and BFL are obtained by TTL=TTL1+TTL2+TTL3 and BFL=BFL1+BFL2+BFL3, respectively.

[0139] Figure 2D A cross section of a mobile device 280 (e.g., a smartphone) is schematically shown having an outer front surface 282 and an outer rear surface 284, the outer rear surface 284 including a dual folded telephoto camera 250. The aperture of the camera 250 is located at the rear surface 284. The front surface 282 may, for example, include a screen (not visible). The mobile device 280 has a raised area 288 and a regular area 286 having a thickness ("T"). The raised area has a raised length ("BL") and a raised thickness T+B. The module area 272 of the camera 250 is included in the raised area 288. The shoulder area 274 is included in the regular area 286. Optionally, in some embodiments, a portion of the shoulder area 274 may also be included in the raised area 288.

[0140] The camera 250 (which may be only partially included in the raised area 288) allows for a relatively small camera raised area (ie, a short BL).

[0141] For clarity, all camera modules and optical lens systems disclosed herein are advantageously used in mobile devices (such as smartphones, tablet computers, etc.).

[0142] FIG. 3A to FIG. 3D and Figures 4 to 7A An optical lens system disclosed herein is shown. FIG. 3A to FIG. 3D as well as Figures 4 to 7A All lens systems shown in FIG. 1 can be included in a dual-folded camera module (such as FIG. 2A to FIG. 2D 200 or 250) shown in FIG. In all optical lens systems disclosed below, lens element L 1 The optical height and optical width define the aperture of the optical lens system.

[0143] Table 1 summarizes the FIG. 3A to FIG. 3E and Figures 4 to 7AThe values ​​of the characteristics and their ratios (H) in the lens systems 300, 320, 350, 400, 500, 600 and 700 shown in FIG. L1 , W L1 ,DA,MH S MH M , H S , H M ,ΔLO,TTL1,BFL1,TTL2,BFL2,TTL3,TTL,BFL,EFL,EFL-G1,EFL-G2,SD,ALT,d5-6,f1,f6,T1,M LM , L M MH M MH S , T-G1, T-G2 are given in mm, HFOV is given in degrees).

[0144] - Type specifies whether the optical lens system is a 1G or 2G optical lens system.

[0145] -N specifies the number of lens elements.

[0146] DA is the aperture diameter. For the cutting lenses 352, 402 and 702, the effective aperture diameter is given. "Effective aperture diameter" here refers to the diameter of a circular (or axisymmetric) aperture, where the circular aperture has the same aperture area as the cutting lens (which has a non-axisymmetric aperture).

[0147] -EFL-G1 and EFL-G2 are the effective focal lengths of lens groups G1 and G2 respectively.

[0148] - Average Lens Thickness ("ALT") measures the average thickness of all lens elements.

[0149] - Average Gap Thickness ("AGT") measures the average thickness of all gaps between lens elements located on the object side of the reflector.

[0150] -d 5-6 YesL 5 and L 6 The distance between.

[0151] -T 1 , T-G1 and T-G2 are L 1 , G1 and G2 center thickness. For 1G optical lens system, T-G1 = T Lens , T Lens is the thickness of the lens.

[0152] - In other examples, H L1 Can be in H L1 =In the range of 4mm-15mm.

[0153] - All other parameters not specifically defined herein have their usual meanings as known in the art.

[0154]

[0155]

[0156]

[0157] Table 1

[0158] Figure 3A An embodiment of an optical lens system disclosed herein and referenced 300 is shown. Lens system 300 includes lens 302, O-OPFE 304 (e.g., a prism or a mirror), I-OPFE 306 (e.g., a prism or a mirror), optical element 307, and image sensor 308. System 300 is shown with ray tracing. As with all subsequent optical lens systems, optical element 307 is optional and may be, for example, an infrared (IR) filter and / or a glass image sensor dust cover.

[0159] O-OPFE 304 and I-OPFE 306 are both oriented at 45 degree angles relative to the y-axis and the z-axis. For all subsequent optical lens systems, a camera module (such as module 200) that may include optical system 300 is shown. M and MH S .

[0160] The lens 302 includes a plurality of (N) lens elements L i (where "i" is an integer between 1 and N). Here, for example, N=6. The lens 302 is divided into two lens groups, including L 1 and L 2 302-G1 and including L 3 To L 6 302-G2. For all subsequent optical lens systems, the lens elements within each lens group do not move relative to each other.

[0161] L 1 is the lens element closest to the object side, and L N The lens element closest to the image side (i.e., the side where the image sensor is located). This order is applicable to all lenses and lens elements disclosed herein. 302-G1 has an optical (lens) axis 312, and 302-G2 has an optical axis 314. The lens element L included in 302-G1 1 and L 2 The lens element L included in 302-G2 is symmetrical along the OP1 312 axis. 3 To L6 The lens element L is symmetrical along the axis of OP2 314. i Including the corresponding front surface S 2i-1 (the index (or subscript) "2i-1" is the number of the front surface) and the corresponding 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 the specification. Optionally, as is done throughout this specification, the lens surface is labeled "S k ”, k ranges from 1 to 2N. The front surface and the back surface may be aspherical in some cases. However, this is not restrictive.

[0162] As used herein, for each lens element, the term "front surface" refers to the surface of the lens element closer to the camera's entrance (camera object side), and the term "back surface" refers to the surface of the lens element closer to the image sensor (camera image side). Figure 3A Examples of lens elements in , detailed optical data and surface data are given in Tables 2 and 3. The values ​​given for these examples are merely illustrative, and according to other examples, other values ​​may be used.

[0163] The surface types are defined in Table 2. The coefficients of the surfaces are defined in Table 3. The surface types are:

[0164] a) Plano: Flat surface, no curvature

[0165] b) Q type 1 (QT1) surface sag formula:

[0166]

[0167] c) Even Asphere (ASP) surface height formula:

[0168]

[0169] where {z,r} are standard cylindrical polar coordinates, c is the paraxial curvature of the surface, k is the conic parameter, and r norm is usually half the clear aperture of the surface, and A n are the polynomial coefficients shown in the lens data sheet. The Z axis is positive toward the image. The value of the aperture radius is given as the radius of the clear aperture (or simply "aperture"), i.e. DA / 2. The reference wavelength is 555.0nm. Except for the refractive index ("Index") and the Abbe number (Abbe#), the units are mm.

[0170]

[0171]

[0172] Table 2

[0173] The L values ​​for each lens element are given in Table 2. i With their respective focal lengths f i The FOV is given as half FOV (HFOV). The definitions of surface type, Z axis, DA value, reference wavelength, unit, focal length and HFOV are valid for Tables 1 to 13.

[0174] In some examples, the O-OPFE 304 is a reflector, and the dimensions of the O-OPFE 304 are 3.1×3.63 mm (x and y in the top view of the O-OPFE), and the O-OPFE 304 is tilted 45°. Thereafter, the O-OPFE 304 is Y-eccentric 0.845 mm toward L2, so that the center of the O-OPFE is not located at the center of the lens.

[0175] In some examples, the I-OPFE 306 is a reflector, and the dimensions of the I-OPFE 306 are 3.9×3.6 mm (x and y in the top view of the I-OPFE), and the I-OPFE 306 is tilted 45°. Then, the I-OPFE 306 is Y-eccentric toward the optical element 307 by 0.451 mm.

[0176]

[0177] Table 3

[0178] Figure 3B Another 2G optical lens system disclosed herein and referenced as 320 is shown. Lens system 320 is identical to optical lens system 300, except that second lens group 322-G2 is a cut lens obtained by cutting lens group 302-G2 as is known in the art. Cutting is performed only at bottom side 315 of 322-G2, while top side 317 of 322-G2 is not cut. Figure 3B As shown in , cutting allows for smaller MH M and MH S (See Table 1). M and MH S Reduce by about 10% by cutting.

[0179] Figure 3CAnother 2G optical lens system disclosed herein and referenced as 350 is shown. Lens system 350 includes lens 352, O-OPFE 354, I-OPFE 356, optical element 357, and image sensor 358. Lens 352 is divided into two lens groups, including L 1 and L 2 ("G1") 352-G1 and including L 3 To L 6 (“G2”) 352-G2.

[0180] Both the O-OPFE 354 and the I-OPFE 356 are oriented at a 45 degree angle relative to the y-axis and the z-axis.

[0181] MH M The reduction (relative to optical lens systems 300 and 320) is caused by the fact that the width of O-OPFE 354 can be reduced due to the reduction of the extremal field entering optical system 350 in the y-direction.

[0182] Cutting the first lens group such as 302-G1 by X% will make MH M and MH S Reduce by about 0.5·X% to X%. For example, cutting the first lens group by 20% will make MH M and MH S Reduced by about 10% to 20%.

[0183] In addition to the lens aperture (DA / 2, see Table 1), the lens element L included in optical lens system 350 1 To L 6 The lens element L included in the optical lens system 300 1 To L 6 Surface types and surface coefficients are the same as those of optical lens system 350, but in optical lens system 350, lens 352 is cut by 20%. 352-G1 and 352-G2 are cut along the z-axis and y-axis, respectively. 352-G1 is cut at two sides 362 and 364. 352-G2 is also cut at two sides 366 and 368. The surface types of optical lens system 350 are defined in Table 4. Given the surface type of the non-cut lens, the aperture radius (DA / 2) of the lens element included in the cut lens 352 is given by the following formula:

[0184] 1. In the non-cutting direction (L Li ) See the values ​​in Table 4.

[0185] 2. In the cutting direction (L Wi ):Included in 352-G1 and 352-G2(L 6 ) of the lens elements 352-G1 (L1 ) value (see Table 4).

[0186]

[0187]

[0188] Table 4 The cut lens includes one or more cut lens elements L i , that is, it has W Li >H Li (See Figure 3E ). Cutting the lens by X% can make the MH of a camera module (such as 200 or 250) including any of the optical lens systems disclosed herein M and / or MH S Reduce by about 0.5·X% to X%. For example, the D-cut ratio can be 0%-50%, which means that W Li Can be compared to H Li 0%-50% larger, i.e. W Li =H Li To 1.5 H Li In some examples, a first lens group (such as 352-G1) located at the object side of the O-OPFE and a second lens group (such as 352-G2) located at the image side of the O-OPFE may be cut differently, i.e., the first lens group may have a D-cut ratio that is different from the D-cut ratio of the second lens group.

[0189] Figure 3D A perspective view of 2G optical lens system 350 is shown. Cut lens sides 362 and 364 and uncut sides 363 and 365 of 352-G1 are visible. Cut lens sides 366 and 368 of 352-G2 and uncut sides 367 and 369 of 352-G2 can also be seen.

[0190] Figure 3E Element L included in 352-G1 of 2G optical lens system 350 is shown. 1 Top view of L 1 is cut by 20%, i.e. its optical width W L1 Than its optical height H L1 20% larger. 1 The aperture of the lens 352 is defined, which means that the aperture diameter DA also changes accordingly so that the aperture is not axisymmetric. For a cut lens, DA is the effective aperture diameter as defined above.

[0191] Due to the D-cut, the width of the aperture of the lens 352 (“W L ”) can be greater than the height “H L ",like Figure 3EAs shown in H L1 is not measured along the z-axis, such as for the lens element or lens 104 included in 352-G2 (see Figure 1A ) is the optical height of the lens element, H L1 is measured along the y-axis. Therefore, H L1 Not affected by MH M , that is, a lens (such as lens 352) can support H L1 >MH S , i.e., a larger aperture height (measured along the z-axis) than the module shoulder, in contrast to known folded cameras 100. This is beneficial in terms of image quality of a camera including the optical system disclosed herein, as it can overcome the geometric limitations of the lens included in the module shoulder (i.e., H L <MH S ), for example, Figure 1A A known folded camera 100 is shown in FIG. A large aperture height allows for a larger effective DA, resulting in a lower f / #, which is beneficial because it allows more light to enter the camera in a given time interval. Figure 3E The definitions and explanations given in for optical lens system 350 are also valid for all other optical lens systems disclosed herein.

[0192] Figure 4 Another 2G optical lens system is shown with reference numeral 400. Lens system 400 includes lens 402, O-OPFE 404 (e.g., prism or mirror), I-OPFE 406 (e.g., prism or mirror), optical element 407, and image sensor 408. O-OPFE 404 and I-OPFE 406 are both oriented at 45 degrees relative to the y-axis and z-axis. Lens 402 is divided into G1 (including L 1 and L 2 ) and G2 (including L 3 To L 6 ). In some examples, 402-G1 and / or 402-G2 can be cut lenses, as in the examples above. Detailed optical data and surface data for optical lens system 400 are given in Tables 5 and 6. O-OPFE 404 can be a reflector with dimensions of 7.4 mm × 7.82 mm (measured in the O-OPFE plane). I-OPFE 406 can be a reflector with dimensions of 8.4 mm × 7.86 mm (measured in the I-OPFE plane). The thickness of the multiple OPFEs is the thickness relative to the optical axis. In some examples, it can be as shown in Tables 5 and 6. Figure 3B The cut lens 402 is shown so that the O-OPFE 404 and the I-OPFE 406 determine the MH M and MH S , as described in MH M- Cutting and MH S -cut. For such an example, MH M - Cut = 8.85 mm, and MH S - Cut = 6.35 mm (as shown).

[0193]

[0194]

[0195] Table 5

[0196]

[0197]

[0198] Table 6

[0199]

[0200] Table 6 (continued)

[0201] Figure 5 A "1-group" (or "1G") optical lens system is shown, labeled 500, and includes a lens 502 having N=4 lens elements, an O-OPFE 504, an I-OPFE 506, an optical element 507, and an image sensor 508. The lens 502 is not divided into two lens groups, but rather all four lens elements are located at the object side of the O-OPFE 504.

[0202] Detailed optical data and surface data of the optical lens system 500 are given in Tables 7 and 8. Both O-OPFE 504 and I-OPFE 506 can be reflectors. The dimensions of O-OPFE 504 and I-OPFE 506 are 5.0 mm×5.2 mm (measured in the OPFE plane). The thickness about the reflector is the thickness relative to the optical axis. O-OPFE 504 and I-OPFE 506 are tilted 45 degrees relative to OP1 and OP2.

[0203] In some examples of 1G optical lens systems such as 500, 600, and 700, the lens can be a cut lens as seen in the examples above. By cutting along the z-axis, a lower MH can be achieved by reducing the size of the O-OPFE and the size of the I-OPFE. M and MH S By cutting the lens by X% the MH M and MH S Reduce by about 0.5·X% to X%. For example, cutting the lens by 20% will make MH M and MH S Reduced by about 10% to 20%.

[0204]

[0205]

[0206] Table 7

[0207]

[0208] Table 8

[0209]

[0210] Table 8 (continued)

[0211] Figure 6 Another 1G optical lens system labeled 600 is shown, which includes a lens 602 with N=4 lens elements, an O-OPFE 604, an I-OPFE 606, an optical element 607, and an image sensor 608. All 4 lens elements of the lens 602 are located at the object side of the O-OPFE 604. Detailed optical data and surface data of the optical lens system 600 are given in Tables 9 and 10. Both the O-OPFE 604 and the I-OPFE 606 can be reflectors. The size of the O-OPFE 604 is 8.0 mm×6.1 mm (measured in the O-OPFE plane). The size of the I-OPFE 606 is 9.6 mm×7.9 mm (measured in the I-OPFE plane). The thickness of the multiple OPFEs is the thickness relative to the optical axis. The O-OPFE 604 is tilted by α=43 degrees relative to the y-axis. The I-OPFE 606 is tilted by β=47 degrees relative to the y-axis.

[0212]

[0213]

[0214] Table 9

[0215]

[0216]

[0217] Table 10

[0218]

[0219] Table 10 (continued)

[0220] Fig. 7AYet another 1G optical lens system, referenced 700, is shown, comprising a lens 702 having N=4 lens elements, an O-OPFE 704, an I-OPFE 706, an optical element 707, and an image sensor 708. All 4 lens elements are located at the object side of the O-OPFE 704.

[0221] Detailed optical data and surface data of optical lens system 700 are given in Tables 11 and 12. O-OPFE 704 can be a reflector and I-OPFE 706 can be a prism. The size of O-OPFE 704 is 6.2 mm×4.64 mm (measured in the O-OPFE plane). The size of I-OPFE 706 is 6.7 mm×9.16 mm (measured in the I-OPFE plane). O-OPFE 704 and I-OPFE 706 are tilted 45 degrees relative to the y-axis. O-OPFE 704 is a reflector and I-OPFE 706 is a prism.

[0222] The prism 706 includes an object-side bottom stray light prevention mechanism 732 , an object-side top stray light prevention mechanism 734 , an image-side bottom stray light prevention mechanism 722 , and an image-side top stray light prevention mechanism 724 .

[0223]

[0224]

[0225] Table 11

[0226]

[0227] Table 12

[0228]

[0229]

[0230] Table 12 (continued)

[0231] Figure 7B A side view of prism 706 is shown. Figure 7C A perspective view of the prism 706 is shown. The object side bottom stray light prevention mechanism 732 and the object side top stray light prevention mechanism 734 are stray light prevention shields. This means that no light enters the prism 706 where the stray shield 732 and the stray shield 734 are located, but only light that enters in an optically active manner is 736. The image side bottom stray light prevention mechanism 722 and the image side top stray light prevention mechanism 724 are geometric stray light prevention mechanisms, which are hereinafter referred to as "stray light prevention frames".

[0232] The prism 706 has a prism height (“H P ”) and the optical (or optically effective) prism height (“H P-O ”), the prism length measured along the y-axis (“L P ”) and the prism width measured along the x-axis (“W P ”). The bottom stray light prevention frame 722 and the top stray light prevention frame 724 have a length (the lengths of the “bottom frame” and the “top frame” are “L” respectively). BS ” and “L TS ”) and height (“H BS ” and “H TS ”). The bottom stray light prevention mask 732 and the top stray light prevention mask 734 have a height “H” of “bottom mask”, respectively. BM ” and the height of the “top mask” “H TM ”. The values ​​and ranges are given in Table 13 in mm.

[0233] Stray light prevention mechanisms are beneficial because they prevent stray light from reaching an image sensor (such as image sensor 708). Stray light is unwanted light emitted or reflected from objects in the scene that enters the aperture (or iris) of the camera and reaches the image sensor in a light path that is different from the planned (or desired) light path. The planned light path is described as follows:

[0234] 1. Light is emitted or reflected by objects in the scene.

[0235] 2. Light enters the camera's aperture (or iris) and passes through all surfaces of the lens (for a 1G optical lens system) or the G1 of the lens (for a 2G optical lens system).

[0236] 3. For example, in the case where the O-OPFE is a reflector, the light is reflected once. For example, in the case where the O-OPFE is a prism, the light passes through the object-side surface of the O-OPFE once, is reflected once (as shown in the optical lens system disclosed herein), and then passes through the image-side surface of the O-OPFE once.

[0237] 4. For the 2G optical lens system, light passes through all surfaces of lens G2 at one time.

[0238] 5. For example, in the case where the I-OPFE is a reflector, the light is reflected once. For example, in the case where the I-OPFE is a prism, the light passes through the object-side surface of the I-OPFE once, is reflected once (as shown in the optical lens system disclosed herein), and then passes through the image-side surface of the I-OPFE once.

[0239] 6. Light strikes the image sensor.

[0240] Light that reaches the image sensor on any optical path other than the planned optical path described above is considered undesirable and is referred to as stray light.

[0241] Numeric Numerical range <![CDATA[H P ]]> 5.2 3-10 <![CDATA[H P-O ]]> 3.5 2-10 <![CDATA[L P ]]> 6.5 4–12.5 <![CDATA[W P ]]> 7.1 4–12.5 <![CDATA[H BS ]]> 0.18 0.05–1 <![CDATA[L BS ]]> 1.45 0.25–5 <![CDATA[H TS ]]> 0.85 0.2–4 <![CDATA[L TS ]]> 0.85 0.2–4 <![CDATA[H BM ]]> 0.4 0.2–3 <![CDATA[H TM ]]> 1.3 0.5–4

[0242] Table 13

[0243] Fig. 8A A method for focusing (or "auto-focusing" or "AF") in the optical lens system disclosed herein is schematically shown.

[0244] Focusing of 1G optical system

[0245] The lens 802 and O-OPFE 804 move together linearly along the y-axis relative to the non-moving I-OPFE 806 and image sensor 808. Box 812 indicates the movement of components for performing AF, and arrow 814 indicates the direction of movement for performing AF. Actuators known in the art, such as voice coil motors (VCMs) or stepper motors, can be used to actuate the movement and FIG. 8A to FIG. 8C All other sports described in .

[0246] In addition, the 1G optical lens system can perform focus and OIS, like a conventional (or "vertical" or "non-folded") camera such as the wide-angle camera 130. Specifically, the 1G optical lens system can be focused by moving only a lens (such as lens 802) along an axis parallel to the z-axis relative to all other camera components, that is, lens 802 moves along the z-axis relative to O-OPFE 804, I-OPFE 806, and image sensor 808. To perform OIS along a first OIS axis, only lens 802 can be moved along an axis parallel to the y-axis relative to all other camera components. To perform OIS along a second OIS axis, lens 802 can be moved along an axis perpendicular to both the y-axis and the z-axis relative to all other camera components.

[0247] Focusing of 2G optical system

[0248] The first lens group (such as lens group 302-G1), O-OPFE (such as O-OPFE 304) and the second lens group (such as lens group 302-G2) move together in the y direction. The I-OPFE (such as I-OPFE 306) and the image sensor (such as image sensor 308) do not move.

[0249] Figure 8B A method for performing optical image stabilization (OIS) in a first OIS direction of an optical lens system disclosed herein is schematically illustrated.

[0250] OIS in the first direction in a 1G optical lens system

[0251] The lens 802, O-OPFE 804, and I-OPFE 806 move together linearly along the y-axis relative to the non-moving image sensor 808. Box 816 indicates component movement for performing OIS in a first OIS direction, and arrow 818 indicates the direction of movement for performing OIS in the first OIS direction.

[0252] OIS in the first direction in a 2G optical lens system

[0253] The first lens group, such as 302-G1, O-OPFE (such as O-OPFE 304), the second lens group (such as 302-G2), and the I-OPFE (such as I-OPFE 306) move together in the y direction. The image sensor (such as image sensor 308) does not move. In other 2G optical lens systems, only the first lens group (such as 302-G1), O-OPFE (such as O-OPFE 304), and the second lens group (such as 302-G2) move relative to the I-OPFE (such as I-OPFE 306) and relative to the image sensor (such as image sensor 308).

[0254] Figure 8C A method disclosed herein for performing OIS in a second OIS direction for an optical lens system is schematically illustrated.

[0255] OIS in the second direction in a 1G optical lens system

[0256] The lens 802, O-OPFE 804, and I-OPFE 806 move linearly together perpendicular to the yz coordinate system shown relative to the non-moving image sensor 808. Box 816 indicates component movement for performing OIS in the second OIS direction, and arrow 822 indicates the direction of movement for performing OIS in the second OIS direction. Arrow 822 points in a direction perpendicular to the yz coordinate system shown.

[0257] OIS in the second direction in 2G optical lens system

[0258] The first lens group (such as 302-G1), O-OPFE (such as O-OPFE 304), second lens group (such as 302-G2), and I-OPFE (such as I-OPFE 306) move linearly perpendicular to the yz coordinate system shown relative to an image sensor (such as image sensor 308) that does not move. In other 2G optical lens systems, only the first lens group (such as 302-G1), O-OPFE (such as O-OPFE 304), and second lens group (such as 302-G2) move relative to the I-OPFE (such as I-OPFE 306) and relative to the image sensor (such as image sensor 308).

[0259] It is to be understood that, for the sake of clarity, certain features of the disclosed subject matter described in the context of a single embodiment may also be provided in combination in a single embodiment. Conversely, for the sake of brevity, various features of the disclosed subject matter described in the context of a single embodiment may also be provided separately or in any suitable sub-combination.

[0260] Unless otherwise stated, use of the expression "and / or" between the last two elements of a list of selected options indicates that selection of one or more of the listed options is applicable and can be made.

[0261] It should be understood that when the claim or specification refers to "a" or "an" element, such expression should not be interpreted as there being only one of the element.

[0262] In addition, for the sake of clarity, the term "substantially" is used herein to imply the possibility of variation of values ​​within an acceptable range. According to one example, the term "substantially" used herein should be interpreted as implying a possible variation of up to 5% above or below any specified value. According to another example, the term "substantially" used herein should be interpreted as implying a possible variation of up to 2.5% above or below any specified value. According to another example, the term "substantially" used herein should be interpreted as implying a possible variation of up to 1% above or below any specified value.

[0263] All patents and patent applications mentioned in this specification are incorporated by reference into this specification in their entirety, to the same extent as if each individual patent or patent application was specifically and individually indicated to be incorporated by reference herein. In addition, the citation or identification of any reference in this application should not be construed as an admission that such reference is available as prior art to the present disclosure.

Claims

1. A camera module, comprising: Lens, having N ≥ 4 lens elements (L i ), and having an effective focal length EFL, an aperture diameter DA, an f-number f / #=EFL / DA, an optical total length TTL, and a back focal length BFL, wherein the first lens element (L1) faces the object side, and the last lens element (L N ) facing the image side; A first optical path folding element OPFE, configured to fold the first optical path into a second optical path; and An image sensor having a sensor diagonal of length SD, Wherein, the camera module is a folding digital camera module, wherein the lens is located on the object side of the first OPFE and has a lens thickness T measured along the first optical path L , wherein, 8mm < EFL < 50mm, wherein, T L / TTL < 0.4, and wherein, 0.3 < SD / EFL < 0.

7.

2. The camera module according to claim 1, wherein: 0.4 <SD / EFL<0.7。 3. The camera module according to claim 1, wherein: 0.45 <SD / EFL<0.7。 4. The camera module according to claim 1, wherein: T L / TTL<0.3。 5. The camera module according to claim 1, wherein: T L / TTL<0.25。 6. The camera module according to claim 1, wherein: The first OPFE is oriented at an angle of 45 to 50 degrees relative to the first optical path.

7. The camera module according to claim 1, wherein: The first OPFE is oriented at an angle of 47 degrees relative to the first optical path.

8. The camera module according to claim 1, wherein: The camera module further includes a second OPFE, wherein the first OPFE is an object-side optical path folding element O-OPFE, wherein the second OPFE is an image-side optical path folding element I-OPFE, and wherein the I-OPFE is used to fold the second optical path into a third optical path.

9. The camera module according to claim 8, wherein: The O-OPFE is oriented at an angle of 45 to 50 degrees relative to the first optical path, and wherein the I-OPFE is oriented at an angle of 40 to 45 degrees relative to the first optical path.

10. The camera module according to claim 8, wherein: The O-OPFE is oriented at an angle of 47 degrees relative to the first optical path, and wherein the I-OPFE is oriented at an angle of 43 degrees relative to the first optical path.

11. The camera module according to claim 1, wherein: The camera module has a minimum camera module length ML measured along the second optical path M , and among them, EFL>1.1·ML M .

12. The camera module according to claim 11, wherein: EFL>1.2 ML M 。 13. The camera module according to claim 11, wherein: EFL>1.3 ML M 。 14. The camera module according to claim 8, wherein: The I-OPFE is a prism, and wherein the prism includes a stray light prevention frame for preventing stray light from reaching the image sensor.

15. The camera module according to claim 14, wherein: The prism includes two stray light prevention frames, wherein one of the two stray light prevention frames is located on a side of the prism close to the image sensor, and wherein the other of the two stray light prevention frames is located on a side of the prism far from the image sensor.

16. The camera module according to claim 15, wherein: The prism also includes one or more stray light prevention shields.

17. The camera module according to claim 1, wherein: f / #<3.25。 18. The camera module according to claim 1, wherein: f / #<3。 19. The camera module according to claim 1, wherein: The camera module is divided into a first area and a second area, the first area having a minimum camera module area height MH M , the second region has the minimum shoulder region height MH S <MH M , among which, MH S and MH M is measured along the first optical path, where the minimum size of the aperture is the lens height H measured along the second optical path L , and among them, H L / MH S >0.

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20. The camera module according to claim 19, wherein: The second area of ​​the camera module has a shoulder area height H S , wherein the first area of ​​the camera module has a module area height H M >H S , of which 4mm <H S <10mm, and among them, 6mm <H M <13mm.

21. The camera module according to claim 20, wherein: 6mm <H S <8mm, and among them, 7mm <H M <11mm.

22. The camera module according to claim 1, wherein: 5mm <SD<12mm。 23. The camera module according to claim 1, wherein: EFL / TTL≤1.

1.

24. The camera module according to claim 1, wherein: 16mm≤EFL≤20mm.

25. The camera module of claim 1, wherein: The lens is able to move relative to the image sensor to achieve optical image stabilization.

26. The camera module of claim 1, wherein: All lens elements (L1 to L N )The ratio of the average lens thickness ALT to TTL satisfies ALT / TTL≤0.

05.

27. The camera module of claim 1, wherein: The first lens element (L1) is made of glass.

28. The camera module of claim 1, wherein: The focal length f1 of the first lens element (L1) <EFL / 2。 29. The camera module of claim 1, wherein: N=4, and wherein the sequence of the focal powers of the lens elements (L1 to L4) is positive-negative-positive-positive.

30. The camera module of claim 1, wherein: N=4, and wherein the sequence of the focal powers of the lens elements (L1 to L4) is positive-negative-positive-negative.

31. The camera module of claim 1, wherein: N=4, and wherein the sequence of the focal powers of the lens elements (L1 to L4) is positive-negative-negative-positive.

32. The camera module of claim 1, wherein: The lens is cut along an axis parallel to the first optical path.

33. A mobile device comprising the camera module according to any one of claims 1 to 18, 22 to 32.

34. The mobile device according to claim 33, wherein: The mobile device is a smartphone.

35. A mobile device comprising the camera module according to any one of claims 19 to 21, wherein: The mobile device has a device thickness T and a camera bump area, wherein a height of the camera bump area is greater than T, wherein a first area of ​​the camera module is incorporated into the camera bump area, and wherein a second area of ​​the camera module is not incorporated into the camera bump area.

36. The mobile device according to claim 35, wherein: The mobile device is a smartphone.

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