Compact folded telephoto camera with ultra-thin high-quality optical image stabilization actuator

Abstract

A folding telephoto camera includes: a lens including a plurality of lens elements divided into a first lens group (G1) and a second lens group (G2), and having an effective focal length (EFL) of 8 mmlt; eFLlt, EFLlt; the thickness is within the range of 40 mm; an image sensor; an optical path folding element (OPFE) for folding the first optical path (OP1) into a second optical path (OP2), where G1 is located on the object side of the OPFE and where G2 is located on the image side of the OPFE, the OPFE having a height HO measured along OP1; and an optical image stabilization (OIS) actuator for executing the OIS and including a single motor for executing the OIS in a first OIS direction by rotating G1 about a G1 rotation axis (RotG1) and rotating OPFE about an OPFE rotation axis (RotOPFE) < RotG1, where the G1 rotation axis and the OPFE rotation axis are parallel to each other and simultaneously perpendicular to both OP1 and OP2, and rotating G1 about a G1 rotation stroke (RotG1) and OPFE about an OPFE rotation stroke (RotOPFE) < RotG1. And wherein the distance dROT between the G1 axis of rotation and the OPFE axis of rotation satisfies dROTlt; hO / 2.

Description

[0001] Cross - Reference to Related Applications

[0002] This application claims the benefit of priority of U.S. Provisional Patent Application No. 63 / 597,017, filed on Nov. 8, 2023, the entire content of which is incorporated herein by reference. Technical Field

[0003] The subject matter of the present disclosure generally relates to the field of digital cameras.

[0004] Definitions

[0005] In this application and for the optical and other properties referred to throughout the specification and drawings, the following symbols and abbreviations are used, which are all terms known in the art:

[0006] Total Track Length (TTL): When the system is focused at an infinite object distance, the maximum distance between the point on the front surface S1 of the first lens element L1 facing the object, measured along an axis parallel to the optical axis of the lens, and the image sensor.

[0007] Back Focal Length (BFL): When the system is focused at an infinite object distance, the minimum distance between the point on the rear surface S N of the last lens element L 2N and the image sensor, measured along an axis parallel to the optical axis of the lens.

[0008] Effective Focal Length (EFL): In the lens (the assembly of lens elements L1 to L N ), the distance between the principal point P' and the rear focal point F' of the lens.

[0009] f-number (f / #): The ratio of the effective focal length EFL to the diameter of the entrance pupil (or simply the aperture diameter “DA”), f / # = EFL / DA. Background Art

[0010] Multi-aperture cameras (or “multi-camera cameras,” where a “dual-camera” with two cameras is an example) are standard in today's portable electronic mobile devices (“mobile devices” such as smartphones, tablets, headphones, smartwatches, etc.). Multi-camera cameras typically include a wide field of view (or “angle”) FOV W camera (“wide” camera or “wide-angle” camera) and at least one additional camera, such as an additional camera with a narrower (compared to FOV W ) FOV (telephoto or “telephoto” camera, FOVT )。

[0011] Figure 1A Schematically shows an embodiment of a known foldable telephoto camera 100. For simplicity, such a camera may be referred to herein simply as a "foldable camera", and it should be understood that all such foldable cameras are "telephoto" cameras. The camera 100 includes a lens 102, an optical path folding element (OPFE, Optical Path Folding Element) 104 (such as a prism or a mirror), and an image sensor 106 having a sensor height H S . Here and hereinafter, the height is measured along OP1 (108). The OPFE 104 folds the first optical path ("OP1") 108 to the second optical path (OP2) 110. The lens 102 includes a plurality (N) of lens elements (here: N = 7), respectively labeled L1 - L7, which are divided into two lens groups. The first lens group 102 - G1 ("G1") includes L1 - L4 and has a thickness T G1 , located on the object side of the OPFE, and has a lens optical axis parallel to OP1. The second lens group 102 - G2 ("G2") includes L5 - L7 and has a thickness T G2 , located on the image side of the OPFE, and has a lens optical axis parallel to OP2, that is, perpendicular to the sensor 106. The lens elements respectively included in either G1 or G2 do not move relative to each other. The lens 102 has a lens width W L (measured along OP2). Here and hereinafter, the width is measured along an axis perpendicular to OP1. The distance between 102 - G1 and the OPFE 104 is labeled as ΔLO. The width of the OPFE 104 is labeled as W OPFE . The TTL of the camera 100 is divided into TTL1 and TTL2. TTL1 is parallel to OP1 108, TTL2 is parallel to OP2 110, and TTL = TTL1 + TTL2. The aperture of the camera 100 is labeled as 112.

[0012] The figure shows the theoretical limits of the length ("minimum module length" or "MLM") of a camera module including the camera 100, the first height ("minimum module height" or "MHM") of the camera module in the "module" region, and the second height ("minimum shoulder height" or "MHS") of the camera module in the "shoulder" region, where MHM > MHS. MLM, MHM, and MHS are defined by the minimum dimensions of the components included in the camera 100. Hereinafter, "HM" represents "camera module height", or more simply only "module height", and "HS" represents "camera shoulder height", or more simply only "shoulder height". The camera module includes a housing 114.

[0013] Figure 1B A cross-sectional view schematically shows a mobile device 120 (such as a smartphone) including a known foldable camera 100. The aperture 112 of the camera 100 is located at the rear surface 122. The front surface 124 may include, for example, a screen (not shown). The mobile device 120 has a regular area 126 and a camera raised area 128. The regular area 126 has a thickness (“T”), and the camera raised area 128 is raised by a height B relative to the regular area 126. The raised area 128 has a raised length (“BL”) and a raised thickness T + B. The module area of the camera 100 can be integrated into the raised area 128, and the shoulder area can be integrated into the regular area 126, as shown.

[0014] For industrial design reasons, a smaller camera protrusion (i.e., a shorter BL) is required. The camera 100 is only partially integrated in the raised area, so the BL is relatively short. Generally speaking, for thin mobile devices, minimizing MHM and MHS is beneficial. Of particular concern is minimizing MHM because this can achieve the minimization of B. For compact cameras, minimizing MLM also has advantages. Of particular concern is minimizing R1 because this can effectively minimize BL.

[0015] Figure 1C A known dual camera 150 is shown, which includes a foldable zoom telephoto camera 160 and a wide-angle camera 180. The foldable camera 160 includes an OPFE 162, a lens 170 having a plurality of lens elements (not visible), and an image sensor 166. The OPFE folds the optical path from OP1 172 to OP2 174. The wide-angle camera 180 includes a lens 184 having an optical axis 186 and an image sensor 188.

[0016] An advantage of the camera 100 is that a relatively large aperture diameter (“DA”) can be achieved, which results in a relatively low f / #. This is because the optical power of the lens 102 - G1 concentrates the light before it is incident on the OPFE 104. For example, methods for OIS and focusing for cameras such as the camera 100 are described in the co-owned international patent application PCT / IB2023 / 060577.

[0017] Figure 1D -F shows a method for performing OIS as disclosed in FIGS. 12A - D of PCT / IB2023 / 060577, where it is referred to as “Method 7”. This term will also be used in the future. Method 7 is beneficial because it achieves a relatively high image quality (“IQ”) while performing OIS. Figure 1D-F schematically shows displacements of different elements of a camera module 2000 implementing an OIS method 7. The camera module 2000 may include a first lens group (“G1”) 2010, may include a second lens group (“G2”) 2020, and may include a prism as an optical path folding element 2030. The displacements may be visualized by a first reference line 2040, a second reference line 2050, and a reference plane 2060.

[0018] To perform the OIS method 7 in a first direction OIS1, G1 2010 and OPFE 2030 may each rotate about an axis that is perpendicular to both OP1 and OP2. The rotation axes of G1 2010 and OPFE 2030 may be different (or “distinct”). In other words, G1 2010 may rotate about a first axis, OPFE 2030 may rotate about a second axis, and the first axis may be different from the second axis. G1 2010 and OPFE 2030 may rotate simultaneously, i.e., co-rotate. G1 2010 and OPFE 2030 may rotate different angles.

[0019] In some instances, to perform the OIS method 7 in a second direction OIS2 perpendicular to OIS1, G1 2010 and OPFE 2030 may rotate together about an axis parallel to OP2. In other instances, OIS in OIS2 may be performed by rotating G1 2010 and OPFE 2030 together about an axis parallel to OP1.

[0020] Operating an OIS actuator to perform method 7 would be beneficial. Examples of such OIS actuators are described below. SUMMARY

[0021] In various instances, a folding telephoto camera is provided, including: a lens, the lens including a plurality of lens elements L i , the plurality of lens elements L i being divided into a first lens group (G1) and a second lens group (G2), and having an effective focal length (EFL), an image sensor, an optical deflection mirror (OPFE), and an OIS actuator, wherein the effective focal length (EFL) is in the range of 8 mm < EFL < 40 mm, the optical deflection mirror (OPFE) is for folding a first optical path (OP1) to a second optical path (OP2), wherein G1 is located on the object side of the OPFE, and wherein G2 is located on the image side of the OPFE, the OPFE having a height H measured along the OP1 direction O , the OIS actuator being for operating to perform OIS and including a single motor, wherein, using the single motor, OIS is performed along a first OIS direction to rotate G1 about a G1 rotation axis by a rotation stroke (Rot G1), and simultaneously rotate the OPFE about the OPFE rotation axis by an OPFE rotation stroke (Rot OPFE ), and Rot OPFE < Rot G1 , where the G1 rotation axis and the OPFE rotation axis are parallel to each other and both perpendicular to OP1 and OP2, and where the distance d ROT between the G1 rotation axis and the OPFE rotation axis satisfies d ROT < H O / 2.

[0022] In some instances, 2.5 < H O / d ROT < 7.5. In some instances, 3 < H O / d ROT < 6.

[0023] In some instances, the OIS actuator includes at least a joystick system having a first joystick, a second joystick, and a joystick reference point, the first joystick and the second joystick defining respective positions of the G1 rotation axis and the OPFE rotation axis. In some such instances, the OIS actuator includes two ball bearings defining the G1 rotation axis, two ball bearings defining the OPFE rotation axis, and one ball bearing defining the joystick reference point. In other such instances, the OIS actuator includes a flexure defining the joystick reference point, two ball bearings defining the G1 rotation axis, and two ball bearings defining the OPFE rotation axis.

[0024] In other such instances, the OIS actuator includes two G1 joysticks fixedly connected to G1, and the OIS actuator includes two OPFE joysticks fixedly connected to OPFE.

[0025] In some instances, the line connecting the OPFE rotation axis and the joystick reference point forms an angle α with OP1, the line connecting the G1 rotation axis and the joystick reference point forms an angle β with OP1, the line connecting the G1 rotation axis and the joystick reference point forms an angle γ with OP2, 60 degrees < α < 120 degrees, 30 degrees < β < 90 degrees, and 0 degrees < γ < 90 degrees. In some such instances, 80 degrees < α < 100 degrees. In other such instances, 85 degrees < α < 95 degrees. In some such instances, 50 degrees < β < 70 degrees. In other such instances, 55 degrees < β < 65 degrees.

[0026] In some instances, the first joystick is a G1 joystick fixedly connected to G1 and having a length L G1 , the second joystick is an OPFE joystick fixedly connected to OPFE and having a length L OPFE , and the joystick ratio L G1 :L OPFEand the angles α, β, and γ define a rotation stroke ratio Rot OPFE :Rot G1 is in the range of 1:1.25 to 1:3, and L G1 :L OPFE is in the range of 0.5:1 to 1:2. In some such instances, L G1 :L OPFE is in the range of 0.75:1 to 0.95:1. In other such instances, L G1 :L OPFE is 0.84:1 to 0.88:1. In some such instances, L G1 is in the range of 1 mm - 10 mm. In other instances, L G1 is in the range of 2 mm – 5 mm. In yet other instances, L G1 is in the range of 3 mm – 4 mm. In some such instances, Rot OPFE :Rot G1 is in the range of 1:1.4 to 1:8. In other such instances, Rot OPFE :Rot G1 is in the range of 1:1.5 to 1:7.

[0027] In some instances, the G1 rotation axis, the joystick reference point, and the OPFE rotation axis are on a straight line.

[0028] In some instances, the first joystick is fixedly connected to G1 and has a length L G1 of the G1 joystick, and the second joystick is fixedly connected to OPFE and has a length L OPFE < L G1 of the OPFE joystick. The joystick ratio L G1 :L OPFE is equal to the rotation stroke ratio Rot OPFE :Rot G1 in the range of 1:1.25 to 1:3, and L G1 :L OPFE is in the range of 1:1.25 to 1:3. In some such instances, L G1 :L OPFE is in the range of 1:1.5 to 1:1.8. In other such instances, L G1 :L OPFE is 1:1.65. In some such instances, L G1 is in the range of 0.5 mm - 5 mm. In other such instances, L G1 is in the range of 1.25 mm - 2.5 mm. In some such instances, Rot OPFE :Rot G1In the range of 1:1.4 to 1:8. In other such instances, Rot OPFE :Rot G1 In the range of 1:1.5 to 1:7.

[0029] In some instances, the reflective surface of the OPFE forms an angle in the range of 40 degrees to 45 degrees with OP1.

[0030] In some instances, the folding camera includes an additional OPFE for folding OP2 to a third optical path (OP3) parallel to OP1, and the additional OPFE is located on the image side of the lens.

[0031] In some instances, the folding camera includes an optical filter, and the optical filter is oriented perpendicular to OP2.

[0032] In some instances, the joystick reference point is a rolling hinge.

[0033] In some instances, the single motor is a voice coil motor including two or more coils and two or more magnets. In some instances, the voice coil motor includes two or more yokes.

[0034] In some instances, the folding camera includes three or more preload springs. In some such instances, the first preload spring is located on the first side of the OPFE, and the second and third preload springs are located on the second side of the OPFE.

[0035] In some instances, the folding camera has a camera height H measured along OP1 M , the height H M In the range of 5 - 15 mm. In some such instances, H M In the range of 5 - 12.5 mm. In some such instances, the folding camera has a first camera module area and a second camera shoulder area, the first camera module area having a module area height H M , the second camera shoulder area having a camera shoulder area height H measured along OP1 S , and H S <H M - 2 mm.

[0036] In some instances, OIS along the second OIS direction is performed by rotating G1 and the OPFE together about an axis parallel to OP2 using a single motor.

[0037] In some instances, focusing is performed by linearly moving G2 along an axis parallel to OP2. In some instances, focusing is performed by moving G1, the OPFE, and G2 together along OP2. In some instances, focusing is performed by moving the image sensor parallel to OP2.

[0038] In some examples, the OPFE is a prism.

[0039] In some examples, the image sensor has a sensor diagonal (SD) in the range of 3 mm < SD < 17 mm.

[0040] In various examples, a foldable camera is included in a mobile device. In some such examples, the mobile device is a smartphone. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The embodiments disclosed herein will be described non - restrictively with reference to the drawings listed later in this section. The drawings and the description are intended to clarify and elucidate the embodiments disclosed herein and should not be regarded as any limitation.

[0042] Figure 1A A known foldable telephoto camera is shown;

[0043] Figure 1B A known mobile device having an outer surface and including a known foldable telephoto camera is schematically shown; Figure 1A ... of the known foldable telephoto camera;

[0044] Figure 1C A known dual - camera is schematically shown;

[0045] Figure 1D A known method for performing OIS using a foldable telephoto camera located at a central position is shown;

[0046] Figure 1E A known method for performing OIS using a foldable telephoto camera located at an OIS position along a first OIS axis is shown;

[0047] Figure 1F A known method for performing OIS using a foldable telephoto camera located at another OIS position along a second OIS axis is shown;

[0048] Figure 2A An embodiment of a foldable telephoto camera operable to perform the OIS disclosed herein is schematically shown in a cross - sectional side view;

[0049] Figure 2B The components of a foldable telephoto camera operable to perform the OIS disclosed herein are shown in a side view;

[0050] Figure 2C The components of a foldable telephoto camera are shown in a cross - sectional side view Figure 2B ... of the foldable telephoto camera;

[0051] Figure 2D The components of a foldable telephoto camera are shown in a cross - sectional perspective viewFigure 2B Folding telephoto camera;

[0052] Figure 3A A side view shows the components of a folding telephoto camera in a central OIS position that is operable to perform the OIS disclosed herein;

[0053] Figure 3B Shown in perspective view Figure 3A the components of a folding telephoto camera;

[0054] Figure 3C A side view shows the components of another folding telephoto camera in a non - central OIS position that is operable to perform the OIS disclosed herein;

[0055] Figure 3D Shown in perspective view Figure 3C the components of a folding telephoto camera;

[0056] Figure 4A A cross - sectional side view schematically shows the components of an exemplary OIS actuator in a central position disclosed herein.

[0057] Figure 4B A cross - sectional side view shows the components of the OIS actuator of Figure 4A in a first OIS position.

[0058] Figure 4C A cross - sectional side view shows the components of the OIS actuator of Figure 4A in a second OIS position;

[0059] Figure 5A A cross - sectional view schematically shows another embodiment of the folding telephoto camera disclosed herein;

[0060] Figure 5B A first side view shows the components of Figure 5A a folding telephoto camera;

[0061] Figure 5C A cross - sectional side view shows the components of Figure 5A a folding telephoto camera;

[0062] Figure 5D Another cross - sectional side view shows the components of Figure 5A a folding telephoto camera;

[0063] Figure 5E A cross - sectional perspective view shows the components of Figure 5A a folding telephoto camera;

[0064] Figure 5F In line with Figure 5BThe opposite second side view shows Figure 5A components of the foldable telephoto camera of

[0065] Figure 5G Another foldable telephoto camera disclosed herein is shown in a cross-sectional perspective view;

[0066] Figure 6A Components of the foldable telephoto camera of Figure 5A in a second OIS position relative to OIS1 are shown in a side view;

[0067] Figure 6B Components of Figure 6A are shown in a cross-sectional perspective view;

[0068] Figure 7A Components of another exemplary OIS actuator in a first position disclosed herein are schematically shown in a cross-sectional side view;

[0069] Figure 7B Components of the OIS actuator of Figure 7A in different positions are schematically shown in the same view;

[0070] Figure 8A Components of another exemplary foldable telephoto camera disclosed herein are shown in a perspective view;

[0071] Figure 8B Components in the camera of Figure 8A in a first operation mode when OIS1 is executed are shown in a rear side view;

[0072] Figure 8C Components of the camera of Figure 8A in a second operation mode when OIS2 is executed are shown in a rear side view;

[0073] Figure 9A A ball bearing (BB) in a first preload embodiment is shown;

[0074] Figure 9B Another BB in a second preload embodiment is shown;

[0075] Figure 9C Yet another BB in a third preload embodiment is shown;

[0076] Figure 9D Yet another BB in a fourth preload embodiment is shown;

[0077] Figure 9E Yet another BB in a fifth preload embodiment is shown;

[0078] Figure 9F Yet another BB in a sixth preload embodiment is shown. Detailed implementation manners

[0079] In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding. However, those skilled in the art will understand that the disclosed subject matter may be practiced without these specific details. In other instances, well-known methods and features have not been described in detail so as not to obscure the presently disclosed subject matter.

[0080] Hereinafter, when referring to OIS, we only refer to the method 7 disclosed in PCT / IB2023 / 060577 and the OIS discussed above. The symbols introduced above are used herein. All “heights” are measured along an axis parallel to OP1. It should be noted that all implementation manners are conducive to being used in mobile devices such as smart phones. All cameras, actuators, etc. disclosed herein can perform OIS according to method 7:

[0081] - OIS1: The first lens group (“G1”) and the OPFE each rotate about an axis perpendicular to OP1 and OP2, and the angle of rotation of G1 is larger than that of the OPFE.

[0082] - OIS2: The first lens group and the OPFE rotate together about an axis parallel to OP2.

[0083] Figure 2A An implementation manner of a foldable telephoto camera with the reference numeral 200 disclosed herein is schematically shown in a cross-sectional view. The camera 200 includes the OIS actuator described herein ( Figure 2B - D, Figure 5B - D, Figure 6A - D). The lens 202 included in the camera 200 is divided into a first lens group (“G1”) and a second lens group (“G2”). The first lens group has a first lens optical axis parallel to the first optical path (“OP1”), and the second lens group has a second lens optical axis parallel to the second optical path (“OP2”). In some embodiments, as Figure 2A shown, the reflection surface (such as 205) of the prism 204 forms an angle of 45 degrees with OP1, such that OP1 and OP2 are perpendicular to each other. In other embodiments, the reflection surface of the prism 204 may form an angle less than 45 degrees with OP1, for example, an angle in the range of 40 degrees to 45 degrees, such as 44 degrees or 43 degrees. In such embodiments, OP1 and OP2 form an angle less than 90 degrees therebetween.

[0084] The camera 200 includes, from the object side to the image side, G1, the prism 204, G2, and the image sensor 206. The prism 204 serves as the OPFE. Hereinafter, "prism" and "OPFE" may be used interchangeably. In other embodiments, a mirror surface may serve as the OPFE. The image sensor 206 is oriented perpendicular to OP2. To perform OIS along OIS1, the prism 204 rotates about a prism rotation axis (or simply referred to as the "prism axis") 208 that is parallel to the x-axis and perpendicular to OP1 and OP2, and G1 rotates about a G1 rotation axis (or simply referred to as the "G1 axis") 209 that is parallel to the x-axis, where the G1 axis 209 is located at a different position (or "positioned") from the prism axis 208. Specifically, the G1 axis 209 is located closer to the object than the prism axis 208. The distance d between the G1 axis 209 and the prism axis 208 is shown in the figure. ROT and the height H of the prism 204 P , both of which are measured along OP1.

[0085] Figure 2B A side view shows the components of an embodiment of a foldable telephoto camera labeled 210 disclosed herein. The camera 210 includes the OIS actuator 212 disclosed herein. The camera 210 includes all components of the camera 200. In addition, the OIS actuator 212 includes a G1 holder 214 that holds G1 and is fixedly connected to G1, a prism holder 216 that holds the prism 204 and is fixedly connected to the prism 204, and a platform 220. The OIS actuator 212 includes a G1 joystick (e.g., Figure 4A 404 in -C) that is fixedly attached to the G1 holder 214 and rotatable about the G1 axis (such as the G1 axis 209 defined by the G1 ball bearing ("BB") 222), a prism joystick (e.g., Figure 4A 406 in -C) that is fixedly attached to the prism holder 216 and rotatable about the prism axis (such as the prism axis 208 defined by the prism BB 224), and a flexure 226. The flexure 226 defines a joystick reference point 228. The G1 axis 209 and the prism axis 208 are parallel to the x-axis, and their positions (or "locations") are defined by the G1 BB 222 and the prism BB 224, respectively. H P and d ROT The ratio of is approximately H P / d ROT ≈5.0. In other embodiments, the ratio H P / d ROT can be in the range of 2 < H P / d ROT < 10, or in the range of 2.5 < H P / d ROT < 7.5, or preferably in the range of 3 < H P / d ROTwithin the range of < 6.

[0086] When performing OIS1, the distances of G1 BB 222 and prism BB 224 along the y-axis to the flexure 226 (i.e., the distance to the joystick reference point 228) represent the lengths of the G1 joystick (“L G1 ”) and the prism joystick (“L OPFE ”), respectively, as shown in the figure. Note that L G1 and L OPFE also appear below with the same meaning as here. Since the G1 joystick and the prism joystick are oriented parallel to each other, only the lengths L G1 and L OPFE respectively define the rotation angles (or “rotation strokes”, or simply “angles”) of G1 (“Rot G1 ”) and prism 204 (“Rot OPFE ”). As shown in the figure, L G1 < L OPFE , such that Rot G1 > Rot OPFE . Specifically, Rot G1 / Rot OPFE = L OPFE / L G1 . Rot G1 > Rot OPFE is beneficial for achieving relatively high image quality. This is because when rotating OPFE around prism BB 224 by Rot OPFE , the optical path rotates by approximately 2 × Rot OPFE . However, when rotating G1 around G1 BB 222 by Rot G1 , the optical path only rotates by approximately Rot G1 . That is, in order to achieve similar optical effects for G1 and OPFE, G1 must be rotated by Rot G1 > Rot OPFE . In some embodiments, OPFE is a mirror, and the ratio of Rot G1 / Rot OPFE of approximately 2 provides the maximum IQ. In other embodiments, OPFE is a prism. Rotating the prism causes the optical path to deviate slightly from the center, and the effect is that a ratio of Rot G1 / Rot OPFE slightly lower than 2 provides the maximum IQ. In such cases, Rot G1 / Rot OPFE can be in the range of 1.25 to 2, or in the range of 1.5 to 2, for example Rot G1 / Rot OPFE = 1.9 or Rot G1 / Rot OPFE = 1.8 or RotG1 / Rot OPFE = 1.6. Among the components of the camera 210, Rot G1 / Rot OPFE = 1.92.

[0087] For OIS1, the platform 220 does not move. The G1 holder 214 rotates relative to the platform 220 (see also Figure 3A -D and 4A-C) by a first angle (not shown), and the prism holder 216 rotates relative to the platform 220 by a second angle (not shown) that is less than the first angle.

[0088] In some embodiments, L G1 can be in the range of 0.5 mm - 7.5 mm. L OPFE can be in the range of 1 mm - 10 mm. The joystick ratio L G1 :L OPFE can be in the range of 1:1.25 to 1:3. In other words, L OPFE is in the range of 1.25 × L G1 to 3 × L G1 In other embodiments, L G1 :L OPFE can be in the range of 1:1.4 to 1:1.8 or 1:1.5 to 1:1.7. We note that the G1 BB 222, the prism BB positioning 224, and the joystick reference point 228 are located on a line that is substantially parallel to OP1.

[0089] For OIS2, the platform 220 can rotate together with the G1 holder 214 and the prism holder 216 along an axis parallel to OP2.

[0090] In other embodiments, rolling hinges can be used to define L G1 and L OPFE respectively, instead of using the flexure 226 ( Figure 3A -D).

[0091] Figure 2C The components of the camera 210 are shown in a cross-sectional side view. The first lens element L1 and the second lens element L2 are shown respectively in the figure.

[0092] Figure 2DA collapsible telephoto camera labeled 250 as disclosed herein is shown in a cross-sectional perspective view. Camera 250 includes components of camera 210, and in addition includes a second lens group G2, an (optional) optical filter 252, an image sensor (not shown), an OIS voice coil motor (“VCM”) 260 included in OIS actuator 212, and a focusing actuator 270. The image sensor may be positioned on the image side of the optical filter 252, and it may be oriented parallel to the optical filter 252. The OIS VCM 260 includes a coil 262 and a magnet 264, and is operable to perform OIS1. To perform OIS2, an additional VCM may be used. In other embodiments, an OIS VCM such as OIS VCM 560 is operable to perform both OIS1 and OIS2. The focusing VCM 270 includes a coil 272 and a magnet (not shown), and is operable to actuated a linear movement of G2 to focus along the z-axis by means of a focusing ball bearing 274. The collapsible telephoto camera 250 is included in and surrounded by a housing (not shown). The housing does not move relative to the mobile device including camera 250. The coil 262 and the coil 272 and the image sensor are fixedly connected to the housing. G1, prism 204, and G2 move relative to the housing. In other embodiments, the image sensor may move linearly for focusing along the z-axis and relative to G1, prism 204, and G2.

[0093] Figure 3A The components of an embodiment of a collapsible telephoto camera labeled 300 as disclosed herein are shown in a side view. Figure 3B The components of the collapsible telephoto camera 300 are shown in a perspective view. Camera 300 includes an OIS actuator 302, which may include all components of OIS actuator 212 except that it includes a rolling hinge 304 instead of a flexure 226. The position of the rolling hinge 304 defines a joystick reference point. In Figure 3A -B, the components of camera 300 are shown in a centered position (or “zero position”). In the centered position, the top surface of the G1 retainer 214 and the top surface of the prism 204 are parallel to the top surface of the platform 220. The term “centered position” refers to the position where, for OIS1, the OIS actuator 302 is operable to move G1 and prism 204 symmetrically about it. Generally, when optical stabilization is not required, e.g., when a camera such as collapsible telephoto camera 250 is mounted on a tripod, the components of camera 300 are in the centered OIS position. This also applies to all other embodiments disclosed herein.

[0094] When performing OIS1, L G1 and L OPFE respectively define Rot G1 and Rot OPFE for OIS. As shown, LG1 <L OPFE , such that Rot G1 is greater than Rot OPFE . Specifically, since the G1 joystick and the prism joystick are oriented parallel to each other, Rot G1 / Rot OPFE = L OPFE / L G1 . For OIS1, the platform 220 does not move. The G1 holder 214 rotates relative to the platform 220 by Rot G1 , and the prism holder 216 rotates relative to the platform 220 by less than Rot G1 of Rot OPFE . H P and d ROT are marked. The ratio H P / d ROT ≈ 4.6.

[0095] Among the components of the camera 300, Rot G1 / Rot OPFE = 1.88. L G1 can be in the range of 0.5 mm - 5 mm. L OPFE can be in the range of 1 mm - 10 mm. The joystick ratio L G1 :L OPFE can be in the range of 1:1.25 to 1:3. In other embodiments, L G1 :L OPFE can be in the range of 1:1.4 to 1:1.8 or 1:1.5 to 1:1.7.

[0096] Figure 3C The components of the folding telephoto camera 300 are shown in a side view. Figure 3D The components of the folding telephoto camera 300 are shown in a perspective view. In Figure 3C -D, the components of the OIS actuator 300 at a first OIS position different from the central position are shown. At the first OIS position, the prism 204 rotates relative to the platform 220 by Rot OPFE , and the G1 holder 214 rotates relative to the platform 220 by Rot G1 > Rot OPFE . As the rolling hinge 304 moves, L G1 and L OPFE are slightly changed to L G1 + δ G1 and L OPFE + δ P . The respective changes δ G1 and δ P can be significantly less than L G1 and LOPFE , such as δ G1 = L G1 / 50 or less, δ P = L OPFE / 50 or less. In particular, this means that in many cases, δ G1 and δ P can be negligible, and the joystick ratio L OPFE :L G1 and Rot G1 / Rot OPFE remains approximately constant.

[0097] In other embodiments, components of the camera 250 or the camera 300 can be a dual-fold camera (including two OPFEs) such as the foldable telephoto camera 500. In particular, we note that the OIS actuator 212 or the OIS actuator 302 can be operated for use in a dual-fold camera.

[0098] Figure 4A The components of the OIS actuator labeled 400 disclosed herein are schematically shown in a cross-sectional side view. The components of the OIS actuator 400 in the central position are shown in the figure. The components of the OIS actuator 400 include a platform 402, a G1 joystick 404, a prism joystick 406, and a rolling hinge 408. For OIS1, the platform 402 does not move relative to the image sensor. The G1 joystick 404 and the prism joystick 406 can rotate about an axis parallel to the x-axis. In the central position, the G1 joystick 404 and the prism joystick 406 are parallel to the platform 402 and oriented parallel to the y-axis. Here, the joystick ratio L G1 :L OPFE is approximately 1:1.65.

[0099] Figure 4B In the same view as Figure 4A schematically shown are the components of the OIS actuator 400. The components of the OIS actuator 400 in the first OIS position are shown in the figure, where the prism joystick 406 and the G1 joystick 404 are rotated by a first Rot OPFE , a first Rot G1 > the first Rot OPFE . As the rolling hinge 408 moves, L G1 and L OPFE respectively become L G1 - δ G1 and L OPFE - δ P . The respective changes δ G1 and δ P can be much smaller than L G1 and L OPFE respectively, for example, δG1 = L G1 / 50 or less, and δ P = L OPFE / 50 or less.

[0100] Figure 4C Schematically shows the components of the OIS actuator 400 in the same view as Figure 4A . The components of the OIS actuator 400 in the second OIS position are shown in the figure. In the second OIS position, with respect to the platform 402, the prism lever 406 rotates by a second Rot OPFE > the first Rot OPFE , and the G1 lever 404 rotates by a second Rot G1 > the second Rot OFFE . By rotating the G1 lever 404 and the prism lever 406 respectively, G1 and the prism 218 are rotated to perform OIS1. As the rolling hinge 408 moves, L G1 and L OPFE are respectively slightly changed to L G1 - δ G1 and L OPFE - δ P . The respective changes δ G1 and δ P can be respectively much smaller than L G1 and L OPFE , for example, δ G1 = L G1 / 50 or less, δ P = L OPFE / 50 or less.

[0101] Figure 5A Schematically shows another embodiment of the foldable telephoto camera with the reference number 500 disclosed herein in a cross-sectional view. The camera 500 may include the OIS actuator described herein ( Figure 2B - D, Figure 5B - D, Figure 6A - D). The lens 502 included in the camera 500 is divided into two lens groups G1 and G2. The camera 500 includes G1, the first prism 504, G2, the image sensor 506, and the second prism 505 from the object side to the image side. The second prism 505 folds OP2 toward a third optical path ("OP3") parallel to OP1. The image sensor 506 is not oriented perpendicular to OP2. For OIS1, the prism 504 rotates along the prism axis 508, and G1 rotates along the G1 axis 509, and both rotation axes are perpendicular to OP1 and OP2. The G1 axis 509 is located at a position different from the prism axis 508. Specifically, the G1 axis 509 is located closer to the object side than the prism axis 508. The distance d between the G1 axis 509 and the prism axis 508 is shown in the figure ROTand the height H of the prism 504 P , both measured along OP1. In an embodiment, the ratio H P / d ROT ≈ 3.9. In other embodiments, the ratio H P / d ROT may be in the range of 2 to 10, or in the range of 2.5 to 7.5, or preferably in the range of 3 to 6.

[0102] In some embodiments and as Figure 5A shown, the reflective surface 505 of the first prism 504 (labeled in Figure 5C , 5G ) forms a 45-degree angle with OP1 such that OP1 and OP2 are perpendicular to each other. In other embodiments, the reflective surface of the first prism 504 may form an angle less than 45 degrees with OP1, such as an angle in the range of 40 degrees to 45 degrees, such as 44 degrees or 43 degrees. In such an embodiment, OP1 and OP2 form an angle less than 90 degrees between them. The reflective surface of the second prism 505 may form an angle greater than 45° with OP2 such that OP3 is parallel to OP1.

[0103] Figure 5B -F shows in several views the components of another embodiment of the foldable telephoto camera labeled 510 disclosed herein. Figure 5B A first side view of the components of the camera 510 is shown. Figure 5C A cross-sectional side view of the components of the camera 510 is shown. The first prism 504 is visible. Figure 5D Another cross-sectional side view of the components of the camera 510 is shown. Figure 5E A cross-sectional perspective view of the components of the camera 510 is shown. Figure 5F A second side view of the components of the camera 510 is shown, which shows the components of the camera 510 opposite to Figure 5B .

[0104] The components of the camera 510 include the OIS actuator 512 disclosed herein, which is operable to actuate the OIS. The components of the camera 510 include all the components included in the camera 500. Additionally, the OIS actuator 512 includes a G1 holder 514, a prism holder 516, and a platform 520. The G1 holder 514 includes G1 and is fixedly connected to G1. The prism holder 516 includes the first prism 504 and is fixedly connected to the first prism 504 (not visible here, see 5C). The OIS actuator 512 includes a G1 joystick ( Figure 7A -B), a prism joystick ( Figure 7A -B), and is actuated by a joystick reference BB 546 ( Figure 5D-E) Defined joystick reference point 526, where the G1 joystick is fixedly attached to the G1 holder 514 and is movable along the G1 BB 542 located at the G1 BB positioning ( Figure 5D -E) Defined G1 axis rotation, prism joystick ( Figure 7A -B) Fixedly attached to the prism holder 516 and is movable along the prism BB 544 located at the prism BB positioning 524 ( Figure 5D -E) Defined prism axis rotation, both axes being parallel to the x-axis. The G1 joystick and the prism joystick are not oriented parallel to each other, so not only the lengths L G1 and L OPFE define the ratio of Rot G1 / Rot OPFE but also form angles α, β, and γ. In other words, the distances and angles between the three BBs 542, 544, and 546 define the OIS1 movement of G1 and the first prism 504. Among the components of the camera 510, Rot OPFE :Rot G1 is approximately 1:1.67, i.e., Rot G1 = 1.67 × Rot OPFE . In other embodiments, Rot OPFE :Rot G1 can be in the range of 1:1.25 to 1:3, i.e., Rot G1 is in the range of 1.25 × Rot OPFE to 3 × Rot OPFE . In other embodiments, Rot OPFE :Rot G1 can be in the range of 1:1.4 to 1:1.8 or 1:1.5 to 1:1.7.

[0105] Among the components of the camera 510, α = 91.1 degrees, such that the line connecting the G1 BB positioning 522 and the prism BB positioning 524 forms an angle of approximately 1 degree with respect to OP1. β = 59.6 degrees, γ = 37 degrees. In other embodiments, the following values and ranges can be satisfied: α can be in the range of 25 - 150 degrees or 60 - 120 degrees, or preferably in the range of 80 - 100 degrees, or even in the range of 85 - 95 degrees. β can be in the range of 25 - 120 degrees or 30 - 90 degrees, or preferably in the range of 50 - 70 degrees or even 55 - 65 degrees. γ can be in the range of 0 - 120 degrees or 0 - 90 degrees, or preferably in the range of 20 - 50 degrees or 30 - 45 degrees. We note that an angle α of approximately 90 degrees is beneficial for achieving an OIS actuator with a relatively low actuator height.

[0106] Note that for each of the G1 BB 542 and the prism BB 544, there are additional respective BBs (not shown) at the G1 BB positioning 522 and the prism BB 544, respectively, but on the opposite side of the prism 504, so that two respective rotation axes, the G1 axis and the prism axis, are obtained. The joystick reference BB 546 does not have such additional respective BBs.

[0107] For OIS1, the distances and angles from the G1 BB positioning 522 and the prism BB positioning 524 to the joystick reference point 526 represent the lengths of the G1 joystick (“L G1 ”) and the prism joystick (“L OPFE ”), respectively, as shown. L G1 and L OPFE respectively define the Rot G1 of G1 and the Rot OPFE of the prism 504. Here, L G1 = 3.40 mm and L OPFE = 2.93 mm, such that the joystick ratio L G1 :L OPFE is approximately 1:0.86. For OIS1, the platform 520 does not move. The G1 holder 514 rotates relative to the platform 520 holder 516 (see also Figure 6A -D, 7A-B, and 8A-B) by a first angle, and the prism holder 516 rotates relative to the platform 520 by a second angle (not shown) that is less than the first angle. In some embodiments, L G1 can be in the range of 0.5 mm - 10 mm. L OPFE can be in the range of 0.25 mm - 7.5 mm. L G1 :L OPFE can be in the range of 1:0.5 to 1:2.5. In other words, L OPFE is in the range of 0.5×L G1 to 2.5×L G1 . In other embodiments, L G1 :L OPFE can be in the range of 1:0.65 to 1:1 or even 1:0.8 to 1:0.9.

[0108] The OIS actuator 512 includes three preload springs. The preload springs hold the G1 holder 514 and the platform 520 together while allowing the above-mentioned rotational movement. In particular, the first preload spring 530 and the second preload spring 532 ( Figure 5G ) connect the platform 520 and the G1 holder 514, and the third preload spring 534 allows the G1 holder 514 and the prism holder 516 to rotate according to the joystick ratio. The second preload spring 532 is located on the opposite side of the prism 504 relative to the first preload spring 530.

[0109] For OIS2, the G1 holder 514, the prism holder 516, and the platform 520 rotate together about a rotation axis parallel to OP2 relative to the image sensor ( Figure 5G ). As Figure 5E shown, the platform 520 includes three voids (or "cavities"), namely a first void 536, a second void 538, and a third void 539. The three voids are operable to form three BBs that allow OIS movement for OIS2. The first void 536 is a pool-like void that allows linear movement of the balls included in the first void 536. The second void 538 and the third void 539 are pivot-like voids and do not allow linear movement of the balls.

[0110] In some embodiments, the joystick reference point 526 may represent a rolling hinge for respectively defining L G1 and L OPFE . In other embodiments, for OIS2, the platform 520, the G1 holder 514, and the prism holder 516 may rotate together about a rotation axis parallel to OP1.

[0111] Figure 5G A collapsible telephoto camera labeled 550 as disclosed herein is shown in a cross-sectional perspective view. The camera 550 includes the components of the camera 510 and further includes a second lens group G2, an image sensor 552, a second prism 505, and (optionally) an optical filter 554. Additionally, the camera 550 includes an OIS voice coil motor ("VCM") 560 included in the OIS actuator 512 and a focus actuator 570.

[0112] The OIS VCM 560 includes a coil assembly 562 and a magnet assembly 549. The coil assembly 562 includes two coils, namely a first coil 562-1 and a second coil 562-2 ( Figure 8A ), and the magnet assembly 549 includes two magnets, namely a first magnet 549-1 and a second magnet 549-2 ( Figure 5E ). The OIS VCM 560 represents a single motor operation for actuating the OIS movement of OIS1 and OIS2 ( Figure 8A -B). This single motor can be used in all embodiments disclosed herein. We note that a single motor is beneficial in terms of the complexity, cost, and size of the camera included in a mobile device.

[0113] The focusing VCM 570 includes a coil 572 and a magnet (not shown), and is operable to actuating a linear focusing movement of G1, the first prism 504, and G2 together, the linear focusing movement being along OP2 and relative to the second prism 504 and the image sensor 552. The focusing movement can be mediated (or "transmitted") by one or more focusing BBs (not shown). The folded telephoto camera 550 is shown in the figure when focused at infinity. The folded telephoto camera 550 includes a free space (or "void") 574, which allows G1, the first prism 504, and G2 to move together jointly to focus on a finite object distance. The folded telephoto camera 550 can be included in and surrounded by a housing (not shown), which does not move relative to the mobile device including the camera 550. The coil assembly 562 and the coil 572, as well as the second prism 505 and the image sensor 552, are fixedly connected to the housing. G1, the first prism 518, and G2 move relative to the housing. In other embodiments, the image sensor 552 can move linearly along the y-axis relative to G1, the first prism 504, G2, and the second prism 505 for focusing.

[0114] We note that the optional optical filter 554 is oriented perpendicular to OP2 to achieve a relatively thin camera 550, i.e., a camera with a relatively low height. An embodiment of this positioning of the optical filter 554 can be found in the co-owned U.S. Provisional Patent Application 63 / 679182, the entire content of which is incorporated herein by reference.

[0115] Figure 5A -G shows the components of the camera 510 in the first OIS position, which is the central position.

[0116] Figure 6A The components of the camera 510 in the second OIS position relative to OIS1 are shown in a side view. Figure 6B The components of the camera 510 in the second OIS position are shown in a cross-sectional perspective view. The second OIS position is a non-central OIS position. In the second OIS position, according to the ratio Rot OPFE :Rot G1 is 1:1.67, Rot G1 is approximately 5 degrees relative to the central position, while Rot OPFE is approximately 3 degrees relative to the central position. The rotation ratio of G1 and the first prism 504 is determined by the joystick ratio defined by the joystick length and the angle between them.

[0117] Figure 7A The components of another OIS actuator labeled 700 disclosed herein are schematically shown in a cross-sectional side view. In Figure 7AAmong them, the components of the OIS actuator 700 in the central position are shown. The components of the OIS actuator 700 include a platform 702, a G1 joystick 704, a prism joystick 706, and a rolling hinge 708.

[0118] For OIS1, the platform 702 does not move relative to the image sensor, and the G1 joystick 704 and the prism joystick 706 can rotate about different axes parallel to the x-axis relative to the image sensor. The components of the OIS actuator 700 also include a G1BB 742 defining the G1 axis, a prism BB 744 defining the prism axis, and a joystick reference BB 746. The joystick reference BB 746, the G1 joystick 704, and the prism joystick 706 form the rolling hinge 708. In the central position, the prism joystick 706 is oriented perpendicular to the platform 702. The line connecting the prism BB 744 and the joystick reference BB 746 forms an angle of α = 90 degrees with the z-axis, and the line connecting the G1 BB 742 and the joystick reference BB 746 forms an angle of β ≈ 40 degrees with the z-axis. The angle γ is 25 degrees. The lengths of the G1 joystick 704 and the prism joystick 704 are respectively marked as L G1 and L OPFE . The distance between the G1 axis and the prism axis is marked as d ROT . Here, the joystick ratio L G1 :L OPFE is approximately 1:1.3.

[0119] Figure 7B Shown schematically in the same view as Figure 7A are the components of the OIS actuator 700. The components of the OIS actuator 700 in the first OIS position are shown in the figure, where relative to the platform 702, the prism joystick 706 rotates by the first Rot OPFE , and the G1 joystick 704 rotates by the first Rot G1 > the first Rot OPFE . As the rolling hinge 708 moves, L G1 and L OPFE become L G1 +δ G1 and L OPFE -δ P respectively. The respective changes δ G1 and δ P can be respectively much smaller than L G1 and L OPFE , for example, δ G1 = L G1 / 50 or less, δ P = L OPFE / 50 or less. In addition, the angle α becomes α' = α - Rot OPFE = 90 degrees - Rot OPFE, the angle β becomes β' = β - Rot OFFE ≈40 degrees - Rot OPFE .

[0120] Figure 8A Other components of the camera labeled 800 disclosed herein are shown in perspective view. The components of camera 800 include the components of camera 510 and a yoke assembly 802 including a first yoke 802-1 and a second yoke 802-2, and the yoke assembly 802 is included in the OIS VCM 560. The G1 axis is labeled 804, and the prism axis of the first prism 504 is labeled 806. The OIS2 rotation axis of both G1 and the first prism 504 is labeled 808. The OIS actuator 512 and the OIS VCM 560 are operable to actuated the rotational movement of OIS1 (about axes 804 and 806) and OIS2 (about axis 808). The magnet assembly 549 is fixedly connected to the prism holder 516, and the coil assembly 562 and the yoke assembly 802 are fixedly connected to the housing. The yoke assembly 802 is operable to return the OIS VCM 560 to the center position and prevent the components included in the OIS actuator 512 from disengaging. The magnet assembly 549 covers a relatively large dorsal area of the prism holder 516. This is advantageous because it allows for a relatively strong and fast VCM.

[0121] Figure 8B The components of camera 800 in the first operation mode when OIS1 is executed are shown in a rear view. Figure 8C The components of camera 800 in the second operation mode when OIS2 is executed are shown in a rear view.

[0122] Actuate OIS1

[0123] The current flowing through (or “induced”) the first coil 562-1 is in the same direction as the current flowing through the second coil 562-2. The first torque induced by the interaction between the first coil 562-1 and the first magnet 549-1 and the second torque induced by the interaction between the second coil 562-2 and the first magnet 549-2 point in the same direction and are labeled by arrows 810 and 812 respectively.

[0124] Actuate OIS2

[0125] The current flowing through the first coil 562-1 is anti-parallel to the current flowing through the second coil 562-2. The first torque induced by the interaction between the first coil 562-1 and the first magnet 549-1 and the second torque induced by the interaction between the second coil 562-2 and the first magnet 549-2 point in opposite directions and are labeled by arrows 814 and 816 respectively.

[0126] As described above, the OIS actuator 512 includes three preload springs that prevent the BB from disengaging. In other embodiments, other devices for providing preload may be used. Figure 9A -F shows an embodiment of a device for providing preload. In other embodiments, components of the camera 550 or the camera 510 or components of the camera 800 may be a single-fold camera, such as the foldable telephoto camera 200. In particular, we note that the OIS actuator 512 is operable for use in a single-fold camera.

[0127] Figure 9A The ball bearing (BB) numbered 900 in the first preload embodiment is shown. The BB 900 includes a ball 902 that is restricted between a top platform 904 and a bottom platform 906. "Bottom" and "top" herein refer to positions along the y-axis. Two complementary mechanical forces can be applied from the top and bottom respectively. A first mechanical force 908 is applied to the top platform 904 and pushed towards the bottom platform 904, and a second mechanical force 910 is applied to the bottom platform 906 and pushed towards the top platform 904.

[0128] Figure 9B The BB of the second preload embodiment numbered 920 is shown. The BB 920 includes two mechanical springs, a first spring 922 and a second spring 924. Each of the first spring 922 and the second spring 924 is fixedly connected to the top platform 904 and the bottom platform 906, and the spring forces of the first spring 922 and the second spring 924 push the top platform 904 towards the bottom platform 906.

[0129] Figure 9C The BB of the third preload embodiment numbered 930 is shown. The BB 930 includes a magnet 932 fixedly connected to the top platform 904 and a magnetic yoke 934 fixedly connected to the bottom platform 906. The attractive force between the magnet 932 and the magnetic yoke 934 pushes the top platform 904 towards the bottom platform 906.

[0130] Figure 9D The BB of the fourth preload embodiment numbered 940 is shown. The BB 940 includes a magnet 942 fixedly connected to the top platform 904 and another magnetic yoke 944 fixedly connected to the bottom platform 906. The attractive force between the magnet 942 and the magnet 944 pushes the top platform 904 towards the bottom platform 906.

[0131] Figure 9E The BB of the fifth preload embodiment numbered 950 is shown. The BB 950 includes a preload spring 952 fixedly connected to both the top platform 904 and the bottom platform 906. The spring force of the preload spring 952 pushes the top platform 904 towards the bottom platform 906.

[0132] Figure 9F Shows the BB of the sixth preload embodiment with the tag number 960. The BB 960 includes a top platform 904, a magnet 962 fixedly connected to the top platform 904, and a bottom platform 906 having a semi-circular magnetic surface 964.

[0133] For clarity, the embodiments disclosed herein are conducive to use in mobile devices such as smartphones.

[0134] It should be understood that, for clarity, certain features of the presently disclosed subject matter described in the context of separate embodiments may also be provided in combination in a single embodiment. Conversely, for brevity, the various features of the presently disclosed subject matter described in the context of a single embodiment may also be provided separately or in any suitable sub-combination.

[0135] Unless otherwise stated, the expression “and / or” used between the last two members of an alternative list of options indicates that selection of one or more of the listed options is appropriate and possible.

[0136] It should be understood that where a claim or specification refers to “a” or “an” element, such reference should not be construed as meaning only one of such element.

[0137] All patents and patent applications mentioned in this specification are hereby incorporated by reference in their entirety into this specification to the same extent as if each patent or patent application was specifically and individually incorporated by reference into this specification. 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 foldable camera, comprising: A lens, the lens including a plurality of lens elements L i , the plurality of lens elements L i being divided into a first lens group (G1) and a second lens group (G2), and having an effective focal length (EFL) in the range of 8 mm < EFL < 40 mm; Image sensor; An optical path folding element (OPFE) for folding a first optical path (OP1) into a second optical path (OP2), wherein the G1 is located on the object side of the OPFE, the G2 is located on the image side of the OPFE, and the OPFE has a height H measured along the OP1. O ;and an optical image stabilization (OIS) actuator operable to perform OIS and comprising a single motor, Wherein, the folding camera is a folding telephoto camera, The single motor is operable to perform OIS in a first OIS direction by jointly rotating the G1 about the G1 rotation axis by a G1 rotation stroke (Rot G1 ), and rotating the OPFE about the OPFE rotation axis by an OPFE rotation stroke (Rot OPFE )<Rot G1 implement, wherein the G1 rotation axis and the OPFE rotation axis are parallel to each other and perpendicular to both the OP1 and the OP2, and The distance d between the G1 rotation axis and the OPFE rotation axis is ROT Satisfy ROT <H O / 2.

2. The folding camera according to claim 1, wherein: 7.5<d ROT / H O <2.5。 3. The folding camera according to claim 1, wherein: 3<d ROT / H O <6。 4. The folding camera according to claim 1, wherein: The OIS actuator includes a joystick system including at least a first joystick, a second joystick, and a joystick reference point, and wherein the first joystick and the second joystick define respective positions of the G1 rotation axis and the OPFE rotation axis.

5. The folding camera according to claim 4, wherein: A straight line connecting the OPFE rotation axis and the joystick reference point forms an angle α with the OP1, wherein a straight line connecting the G1 rotation axis and the joystick reference point forms an angle β with the OP1, wherein a straight line connecting the G1 rotation axis and the joystick reference point forms an angle γ with the OP2, and wherein 60 degrees < α < 120 degrees, 30 degrees < β < 90 degrees, and 0 degrees < γ < 90 degrees.

6. The folding camera according to claim 5, wherein: 80 degrees<α<100 degrees.

7. The folding camera according to claim 5, wherein: 85 degrees<α<95 degrees.

8. The folding camera according to claim 5, wherein: 50 degrees<β<70 degrees.

9. The folding camera according to claim 5, wherein: 55 degrees<β<65 degrees.

10. The folding camera according to claim 5, wherein: The first joystick is fixedly connected to G1 and has a length L G1 G1 joystick, wherein the second joystick is fixedly connected to the OPFE and has a length L OPFE OPFE joystick, where the joystick ratio L G1 :L OPFE and the angles α, β and γ define the rotation stroke ratio Rot OPFE :Rot G1 In the range of 1:1.25 to 1:3, and where L G1 :L OPFE In the range of 0.5:1 to 1:

2.

11. The folding camera according to claim 10, wherein: L G1 :L OPFE In the range of 0.75:1 to 0.95:

1.

12. The folding camera according to claim 10, wherein: L G1 :L OPFE It is 0.84:1 to 0.88:

1.

13. The folding camera according to claim 10, wherein: L G1 In the range of 1mm-10mm.

14. The folding camera according to claim 10, wherein: L G1 In the range of 2mm-5mm.

15. The folding camera according to claim 10, wherein: L G1 In the range of 3mm-4mm.

16. The folding camera according to claim 10, wherein: Rot OPFE :Rot G1 In the range of 1:1.4 to 1:

8.

17. The folding camera according to claim 10, wherein: Rot OPFE :Rot G1 In the range of 1:1.5 to 1:

7.

18. The folding camera according to claim 4, wherein: The G1 rotation axis, the joystick reference point, and the OPFE rotation axis are located in a straight line.

19. The folding camera according to claim 18, wherein: The first joystick is fixedly connected to G1 and has a length L G1 G1 joystick, wherein the second joystick is fixedly connected to the OPFE and has a length L OPFE OPFE joystick, L OPFE <L G1 , where the joystick ratio L G1 :L OPFE Equal to a rotational stroke ratio Rot in the range of 1:1.25 to 1:3 OPFE :Rot G1 , and where L G1 :L OPFE In the range of 1:1.25 to 1:

3.

20. The folding camera according to claim 19, wherein: L G1 :L OPFE In the range of 1:1.5 to 1:1.

8.

21. The folding camera according to claim 19, wherein: L G1 :L OPFE It is 1:1.

65.

22. The folding camera according to claim 19, wherein: L G1 In the range of 0.5mm to 5mm.

23. The folding camera according to claim 19, wherein: L G1 In the range of 1.25mm to 2.5mm.

24. The folding camera according to claim 19, wherein: Rot OPFE :Rot G1 In the range of 1:1.4 to 1:

8.

25. The folding camera according to claim 19, wherein: Rot OPFE :Rot G1 In the range of 1:1.5 to 1:

7.

26. The folding camera according to claim 1, wherein: The reflective surface of the OPFE forms an angle with OP1 in the range of 40 to 45 degrees.

27. The folding camera according to claim 1, wherein: The folded camera includes an additional OPFE for folding OP2 to a third optical path (OP3) parallel to OP1, and wherein the additional OPFE is located on the image side of the lens.

28. The folding camera according to claim 27, wherein: The folded camera includes an optical filter, and wherein the optical filter is oriented perpendicular to OP2.

29. The folding camera according to claim 4, wherein: The joystick reference point is the roll hinge.

30. The folding camera according to claim 4, wherein: The OIS actuator includes two ball bearings defining the G1 rotation axis, two ball bearings defining the OPFE rotation axis, and one ball bearing defining a joystick reference point.

31. The folding camera according to claim 4, wherein: The OIS actuator includes a flexure defining a joystick reference point, two ball bearings defining a G1 rotation axis, and two ball bearings defining an OPFE rotation axis.

32. The folding camera according to claim 4, wherein: The OIS actuator comprises two G1 joysticks fixedly connected to G1, and wherein the OIS actuator comprises two OPFE joysticks fixedly connected to the OPFE.

33. The folding camera according to claim 1, wherein: The single motor is a voice coil motor (VCM) including two or more coils and two or more magnets.

34. The folding camera according to claim 33, wherein: The VCM includes two or more yokes.

35. The folding camera according to claim 1, wherein: The folding camera includes three or more preloaded springs.

36. The folding camera according to claim 35, wherein: A first preload spring is located on a first side of the OPFE, and wherein a second preload spring and a third preload spring are located on a second side of the OPFE.

37. The folding camera according to claim 1, wherein: The folded camera has a camera height H measured along OP1 M , height H M In the range of 5-15mm.

38. The folding camera according to claim 37, wherein: Height M In the range of 5-12.5mm.

39. The folding camera according to claim 37, wherein: The folding camera has a first camera module area and a second camera shoulder area, wherein the first camera module area has a module area height H M , the second camera shoulder region has a camera shoulder region height H S , height H M and height H S are measured along OP1, and where H S <H M -2mm.

40. The foldable camera according to claim 1, wherein: The single motor is operable to rotate the G1 and the OPFE together about an axis parallel to the OP2 to perform OIS in a second OIS direction.

41. The folding camera according to claim 1, wherein: G2 is linearly moved along an axis parallel to OP2 to perform focusing.

42. The foldable camera according to claim 1, wherein: Focusing is performed by moving G1, OPFE, and G2 together along OP2.

43. The foldable camera according to claim 1, wherein: Move the image sensor parallel to OP2 to perform focusing.

44. The folding camera according to claim 1, wherein: The OPFE is a prism.

45. The foldable camera according to claim 1, wherein: The image sensor has a sensor diagonal (SD) in the range of 3 mm < SD < 17 mm.

46. ​​A folding camera according to any one of claims 1 to 45, wherein: The folding camera is included in a mobile device.

47. The folding camera according to claim 46, wherein: The mobile device is a smartphone.

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