Optical image stabilization assembly and electronic apparatus comprising said assembly

Abstract

An optical image stabilization assembly (1) for an optical unit (2) having an optical axis (OA), said optical image stabilization assembly (1) comprising a stabilization unit (3) configured to move said optical unit (2) in a plane (P) perpendicular to said optical axis (OA). The stabilization unit (3) comprises a base (4), a first pivotable element (5) configured to pivot around a first pivot axis (PA1) relative said base (4), and a second pivotable element (6) configured to pivot around a second pivot axis (PA2) relative said first pivotable element (5), said second pivotable element (6) being configured to accommodate said optical unit (2). A first actuator (7) is configured to pivot said first pivotable element (5) around said first pivot axis (PA1) and a second actuator (8) is configured to pivot said second pivotable element (6) around said second pivot axis (PA2).

Description

[0001] OPTICAL IMAGE STABILIZATION ASSEMBLY AND ELECTRONIC APPARATUS COMPRISING SAID ASSEMBLY

[0002] TECHNICAL FIELD

[0003] The disclosure relates to an optical image stabilization assembly for an optical unit having an optical axis, the optical image stabilization assembly comprising a stabilization unit configured to move the optical unit. The disclosure furthermore relates to an optical system for an electronic apparatus, the optical system comprising an optical image stabilization assembly and an optical unit.

[0004] BACKGROUND

[0005] Small optical devices such as smartphone cameras are commonly equipped with autofocus (AF) and optical image stabilization systems (OIS) which contain mechanisms to operate the optical lens unit of the device in vertical (Z), horizontal (XY) and tilt (XYZ-axis) directions. A wide range of systems have been developed for holding and guiding the optical lens unit in all three directions. Some of the essential parameters that need optimizing in such a system are overall size and compactness, power consumption, speed, sensitivity, dynamic tilt, resolution / accuracy, control / driving methods, reliability, ease of manufacturability, and price.

[0006] The main function of the actuators of the autofocus and optical image stabilization systems is to move the optical lens unit as efficiently as possible in terms of previously listed parameters. Usually, the stabilization system is more critical as it contains the autofocus architecture as a sub-system. As a result, the stabilization system carries also the weight of the autofocus system in addition to the lens unit. Operationally, the stabilization system also needs to be more aggressive and responsive in order to correct handshaking or other external vibration errors efficiently and at high frequencies. The autofocus system typically only needs to operate at a reasonable speed. Harmful factors on the stabilization system relate to the mass of the lens unit (which can be high, e.g. 1000-2000 mg), the holding and guiding architecture for the mass (e.g. spring / flexure with stiffness, ball bearing with friction), and the electric power needed to operate it with the selected actuator type.

[0007] One of the main problems with known solutions is how they handle the dynamical behavior of the moving optical lens unit. A large lens unit mass requires a large size actuator and results in high power consumption. Alternatively, if less power is available, the actuation systems are not able to execute the movement well enough.

[0008] Hence, there is a need for an improved optical image stabilization assembly.

[0009] SUMMARY

[0010] It is an object to provide an improved optical image stabilization assembly. The foregoing and other objects are achieved by the features of the independent claims. Further implementation forms are apparent from the dependent claims, the description, and the figures.

[0011] According to a first aspect, there is provided an optical image stabilization assembly for an optical unit having an optical axis, the optical image stabilization assembly comprising a stabilization unit configured to move the optical unit in a plane perpendicular to the optical axis, the stabilization unit comprising a base; a first pivotable element configured to pivot around a first pivot axis relative the base; a second pivotable element configured to pivot around a second pivot axis relative the first pivotable element, the second pivotable element being configured to accommodate the optical unit, the first pivot axis, the second pivot axis, and the optical axis extending in parallel; a first actuator configured to pivot the first pivotable element around the first pivot axis; and a second actuator configured to pivot the second pivotable element around the second pivot axis.

[0012] This solution provides a suspension and guiding mechanism that allows smooth movement of the optical unit, has a small form factor yet still provides enough lateral displacement range for lens shift based anti-shake correction. Furthermore, any mutual crosstalk of the optical image stabilization assembly, which prevents the optical image stabilization from functioning properly, is minimized or fully eliminated.

[0013] In a possible implementation form of the first aspect, the pivoting movement of the first pivotable element is independent of the pivoting movement of the second pivotable element. This type of isolated movement minimizes or eliminates mutual crosstalk.

[0014] In a further possible implementation form of the first aspect, the first actuator is configured to pivot the first pivotable element in a first plane, the first pivotable element extending substantially in the first plane, and the second actuator is configured to pivot the second pivotable element in a second plane, the second pivotable element extending substantially in the second plane, facilitating a small form factor yet sufficient movement range.

[0015] In a further possible implementation form of the first aspect, movement of the first pivotable element is limited to movement within the first plane, and movement of the second pivotable element is limited to movement within the second plane. This ensures low dynamic tilt during operation, which improves optical performance as lenses are usually sensitive to such errors.

[0016] In a further possible implementation form of the first aspect, the base, the first pivotable element, and the second pivotable element are superimposed on top of each other facilitating a small form factor.

[0017] In a further possible implementation form of the first aspect, the first pivot axis and the first actuator are arranged along a first common diagonal, the first common diagonal intersecting the optical axis, the first pivot axis and the first actuator being arranged at opposite sides of the optical axis; and the second pivot axis and the second actuator are arranged along a second common diagonal, the second common diagonal intersecting the optical axis, the second pivot axis and the second actuator being arranged at opposite sides of the optical axis, the first common diagonal and the second common diagonal extending perpendicular to each other. This solution reduces the dynamic load on the actuators by up to 50 %, as the length of the lever, from pivot axis to optical axis, is reduced. This allows a relatively smaller size actuator and / or less power consumption. Furthermore, by placing the pivot axes at different locations, the turning directions may be perpendicular to each other. Thus, the optics unit can be driven to any selected location that is within the turning range of the mutually pivotable elements.

[0018] In a further possible implementation form of the first aspect, a distance between the first pivot axis and the first actuator along the first common diagonal and a distance between the second pivot axis and the second actuator along the second common diagonal is a first distance, and a distance between the first pivot axis and the optical axis along the first common diagonal and a distance between the second pivot axis and the optical axis along the second common diagonal is a second distance, the second distance being substantially 50 % of the first distance. By reducing the length of the lever of the actuator by as much as 50 %, the dynamic load on the actuators can also be reduced by as much as 50 %. Reducing dynamic load leads to a reduction in friction, inertia, size, power, and force needed as well as improves reliability and response time.

[0019] In a further possible implementation form of the first aspect, the first actuator and the second actuator are based on electromagnetic, shape memory alloy, or piezo technology, allowing any suitable technology to be used. In a further possible implementation form of the first aspect, the first actuator and / or the second actuator comprise a location sensor, able to detect the location of a movable part of the actuator.

[0020] In a further possible implementation form of the first aspect, the base is operably connected to a printed circuit board providing electric signals to the first actuator and the second actuator, facilitating the operation of the optical image stabilization assembly while maintaining a small form factor.

[0021] In a further possible implementation form of the first aspect, the first actuator comprises a first magnet attached to the first pivotable element and first coils attached to the printed circuit board, the first magnet being arranged between the first coils, and the second actuator comprises a second magnet attached to the second pivotable element and second coils attached to the printed circuit board, the second magnet being arranged between the second coils. This allows a simple and reliable solution with high accuracy.

[0022] In a further possible implementation form of the first aspect, the first pivotable element is operably connected to the base by means of a first pivot shaft extending along the first pivot axis and the second pivotable element is operably connected to the first pivotable element by means of a second pivot shaft extending along the second pivot axis. This solution has a simple yet highly reliable architecture.

[0023] In a further possible implementation form of the first aspect, the first pivot shaft is fixed to the base, the first pivotable element being pivotally connected to the first pivot shaft by means of a mechanical fastener, and the second pivot shaft is fixed to the first pivotable element, the second pivotable element being pivotally connected to the second pivot shaft by means of a mechanical fastener. A mechanical fastener may provide a low friction and backlash-free connection.

[0024] In a further possible implementation form of the first aspect, the first pivotable element comprises a first contact surface configured to be in contact with a first reduced friction surface of the base, and the second pivotable element comprises a second contact surface configured to be in contact with a second reduced friction surface of the base. This facilitates lightweight movement with minimum friction and provides additional support for the optical unit.

[0025] In a further possible implementation form of the first aspect, the first contact surface, the second contact surface; the first reduced friction surface, and the second reduced friction surface extend in parallel with each other, the first plane, and the second plane, facilitating a small form factor.

[0026] In a further possible implementation form of the first aspect, the first pivotable element comprises a first counterweight arranged along the first common diagonal, the first counterweight and the first actuator being arranged at opposite sides of the first pivot axis, and the second pivotable element comprises a second counterweight arranged along the second common diagonal, the second counterweight and the second actuator being arranged at opposite sides of the second pivot axis, counteracting the downward force generated by the mass of the optical unit.

[0027] According to a second aspect, there is provided an optical system for an electronic apparatus comprising the optical image stabilization assembly according to the above and an optical unit having an optical axis, the optical unit comprising at least one lens.

[0028] This allows a system wherein the optical unit is suspended and guided in a way that allows smooth movement of the optical unit and provides enough lateral displacement range for lens shift based anti-shake correction, while having a small form factor. In a possible implementation form of the second aspect, the optical system further comprises an autofocus assembly configured to move the optical unit along the optical axis, the second pivotable element of the optical image stabilization assembly accommodating the autofocus assembly. This allows for a spatially efficient and reliable solution since the optical image stabilization unit carries the autofocus unit as extra moving mass).

[0029] According to a third aspect, there is provided an electronic apparatus comprising the optical system according to the above, facilitating an electronic apparatus with a small form factor as well as superior optics. The configuration of the optical system within the housing of the apparatus can enable additional degrees of freedom, e.g. for adjusting the focal length and / or the focus distance.

[0030] These and other aspects will be apparent from the embodiments described below.

[0031] BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In the following detailed portion of the present disclosure, the aspects, embodiments, and implementations will be explained in more detail with reference to the example embodiments shown in the drawings, in which:

[0033] Fig. la shows a perspective view of an optical system in accordance with an example of the embodiments of the disclosure;

[0034] Fig. lb shows a top view of an electronic apparatus comprising the embodiment shown in Fig. la;

[0035] Fig. 2 shows an exploded view of the embodiment of an optical system shown in Figs, la and lb;

[0036] Figs. 3a to 3c show perspective and detail views of a second pivotable element of an optical system in accordance with an example of the embodiments of the disclosure;

[0037] Figs. 4a and 4b show perspective and detail views of a first pivotable element of an optical system in accordance with an example of the embodiments of the disclosure;

[0038] Figs. 5a to 5c show perspective and detail views of a base of an optical system in accordance with an example of the embodiments of the disclosure;

[0039] Figs. 6a to 6c show perspective and detail views of a printed circuit board of an optical system in accordance with an example of the embodiments of the disclosure;

[0040] Fig. 7 shows a perspective view of an optical system in accordance with an example of the embodiments of the disclosure;

[0041] Fig. 8 shows top views of an optical system in accordance with an example of the embodiments of the disclosure, illustrating a range of positions to which an optical unit may be moved by the optical system.

[0042] DETAILED DESCRIPTION

[0043] The present invention relates to an optical image stabilization assembly 1 for an optical unit 2 having an optical axis OA, the optical image stabilization assembly 1 comprising a stabilization unit 3 configured to move the optical unit 2 in a plane P perpendicular to the optical axis OA, the stabilization unit 3 comprising a base 4; a first pivotable element 5 configured to pivot around a first pivot axis PAI relative the base 4; a second pivotable element 6 configured to pivot around a second pivot axis PA2 relative the first pivotable element 5, the second pivotable element 6 being configured to accommodate the optical unit 2, the first pivot axis PAI, the second pivot axis PA2, and the optical axis OA extending in parallel; a first actuator 7 configured to pivot the first pivotable element 5 around the first pivot axis PAI; and a second actuator 8 configured to pivot the second pivotable element 6 around the second pivot axis PA2.

[0044] Embodiments of an optical image stabilization assembly 1 are shown in Figs, la-2, 7, and 8. The optical image stabilization assembly 1 is suitable for moving an optical unit 2 having an optical axis OA. The optical unit 2 may comprise at least one lens.

[0045] The optical image stabilization assembly 1 comprises a stabilization unit 3 configured to move the optical unit 2 in a plane P perpendicular to the optical axis OA.

[0046] The stabilization unit 3 comprises a base 4, a first pivotable element 5 configured to pivot around a first pivot axis PAI relative the base 4, and a second pivotable element 6 configured to pivot around a second pivot axis PA2 relative the first pivotable element 5. The first pivot axis PAI, the second pivot axis PA2, and the optical axis OA extend in parallel.

[0047] The second pivotable element 6 is configured to accommodate the optical unit 2, e.g. in a center cutout.

[0048] The base 4 is shown in detail in Figs. 5a to 5c. The first pivotable element 5 is shown in detail in Figs. 4a and 4b. The second pivotable element 6 is shown in detail in Figs. 3a to 3c. The base 4, the first pivotable element 5, and the second pivotable element 6 may be superimposed on top of each other as illustrated in Fig. 2. The different parts may be made of plastic and by injection molding.

[0049] A first actuator 7 is configured to pivot the first pivotable element 5 around the first pivot axis PAI and a second actuator 8 is configured to pivot the second pivotable element 6 around the second pivot axis PA2.

[0050] The first actuator 7 may be configured to pivot the first pivotable element 5 in a first plane Pl, the first pivotable element 5 extending substantially in a first plane Pl. Correspondingly, the second actuator 8 may be configured to pivot the second pivotable element 6 in a second plane P2, the second pivotable element 6 extending substantially in the second plane P2. The movement of the first pivotable element 5 may be limited to movement within the first plane Pl, and movement of the second pivotable element 6 may be limited to movement within the second plane P2.

[0051] The pivoting movement of the first pivotable element 5 may be completely independent of the pivoting movement of the second pivotable element 6. The pivoting movement of the first pivotable element 5 may be executed simultaneously with the pivoting movement of the second pivotable element 6.

[0052] As illustrated in the different views of Fig. 8, the first pivot axis PAI and the first actuator 7 may be arranged along a first common diagonal DI, and the second pivot axis PA2 and the second actuator 8 may be arranged along a second common diagonal D2, the first common diagonal D 1 and the second common diagonal D2 extending perpendicular to each other.

[0053] The first pivot axis PAI and the first actuator 7 may be arranged at opposite sides of the optical axis OA along the first common diagonal DI, and correspondingly the second pivot axis PA2 and the second actuator 8 may be arranged at opposite sides of the optical axis OA along the second common diagonal D2. The distance between the first pivot axis PAI and the first actuator 7 along the first common diagonal D 1 may be considered a first distance dl . Correspondingly, the distance between the second pivot axis PA2 and the second actuator 8 along the second common diagonal D2 may also be considered the first distance dl . In other words, the distance between the first pivot axis PAI and the first actuator 7 along the first common diagonal D 1 may be equal to the distance between the second pivot axis PA2 and the second actuator 8 along the second common diagonal D2. The distance between the first pivot axis PAI and the optical axis OA along the first common diagonal Dl may be considered a second distance d2. Correspondingly, the distance between the second pivot axis PA2 and the optical axis OA along the second common diagonal D2 may also be considered the second distance d2. In other words, the distance between the first pivot axis PAI and the optical axis OA along the first common diagonal D 1 may be equal to the distance between the second pivot axis PA2 and the optical axis OA along the second common diagonal D2. The second distance d2 may be substantially, or exactly with some tolerance, 50 % of the first distance dl. In other words, distance dl is twice as long as distance d2.

[0054] The first actuator 7 and the second actuator 8 may be based on electromagnetic, shape memory alloy, or piezo technology.

[0055] The first actuator 7 and / or the second actuator 8 may comprise a location sensor 9. One of the location sensors 9 may be a single-axis sensor, e.g. Hall -element, used for detecting moving magnet location. One of the location sensors 9 may be a two- axis sensor able to detect magnet movement in two perpendicular directions.

[0056] The base 4 may be operably connected to a printed circuit board 10 providing electric signals to the first actuator 7 and the second actuator 8. The printed circuit board 10 is shown in detail in Figs. 6a to 6c.

[0057] The printed circuit board 10 may be an organic and layered electronic substrate containing electrical Cu-traces carrying signals. It may also contain an interconnection part such as an interface flexible printed circuit.

[0058] The first actuator 7 may comprise a first magnet 7a attached to the first pivotable element 5 and first coils 7b attached to the printed circuit board 10, the first magnet 7a being arranged between the first coils 7b. Correspondingly, the second actuator 8 may comprise a second magnet 8a attached to the second pivotable element 6 and second coils 8b attached to the printed circuit board 10, the second magnet 8a being arranged between the second coils 8b.

[0059] The coils 7b, 8b may extend vertically from opposite comers of the printed circuit board 10. The coils 7b, 8b may be connected to the base by plastic L-supports. The first coils 7b may form a first pair and the second coils 8b may form a second pair. A moving magnet 7a, 8a may be arranged between the coils of each pair.

[0060] The first pivotable element 5 may be operably connected to the base 4 by means of a first pivot shaft 11 extending along the first pivot axis PAI, i.e. the center axis of the first pivot shaft 11 is coaxial with the first pivot axis PAI. The second pivotable element 6 may be operably connected to the first pivotable element 5 by means of a second pivot shaft 12 extending along the second pivot axis PA2, i.e. the center axis of the second pivot shaft 12 is coaxial with the second pivot axis PA2. The pivot shafts 11, 12 may be metal shafts.

[0061] As shown in Fig. 5a, the first pivot shaft 11 may be fixed to the base 4. The first pivotable element 5 may be pivotally connected to the first pivot shaft 11 by means of the mechanical fastener 13 shown in Fig. 4a. As shown in Fig. 4a, the second pivot shaft 12 may be fixed to the first pivotable element 5. The second pivotable element 6 may be pivotally connected to the second pivot shaft 12 by means of the mechanical fastener 13 shown in Figs. 3a and 3b. The mechanical fastener 13 may be a compression-type metal clip, providing low friction and a backlash-free connection. The first pivotable element 5 may comprise a first contact surface 5a configured to be in contact with a first reduced friction surface 4a of the base 4. The first contact surface 5a is illustrated in Fig. 4b and the first reduced friction surface 4a is illustrated in Fig. 5a. The second pivotable element 6 may comprise a second contact surface 6a configured to be in contact with a second reduced friction surface 4b of the base 4. The second contact surface 6a is illustrated in Fig. 3c and the second reduced friction surface 4a is illustrated in Fig. 5a. The first contact surface 5a, the second contact surface 6a, the first reduced friction surface 4a, and the second reduced friction surface 4b may all extend in parallel with each other, the first plane Pl, and the second plane P2. The first reduced friction surface 4a, and the second reduced friction surface 4b may be metal slide plates.

[0062] The first pivotable element 5 may comprise a first counterweight 14 arranged along the first common diagonal DI, the first counterweight 14 and the first actuator 7 being arranged at opposite sides of the first pivot axis PAI. Correspondingly, the second pivotable element 6 may comprise a second counterweight 15 arranged along the second common diagonal D2, the second counterweight 15 and the second actuator 8 being arranged at opposite sides of the second pivot axis PA2. The counterweights 14, 15 are shown inFig. 7. The counterweights 14, 15 may be attached to the mechanical fasteners 13.

[0063] The present invention also relates to an optical system 16 for an electronic apparatus 18, the optical system 16 comprising the optical image stabilization assembly 1 as described above and an optical unit 2 having an optical axis OA, the optical unit 2 comprising at least one lens.

[0064] The optical system 16 may further comprise an autofocus assembly 17 configured to move the optical unit 2 along the optical axis OA. The second pivotable element 6 of the optical image stabilization assembly 1 accommodates the autofocus assembly 17.

[0065] Furthermore, the present invention relates to an electronic apparatus 18, such as a smartphone or tablet, comprising the optical system 16 described above.

[0066] The various aspects and implementations have been described in conjunction with various embodiments herein. However, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed subject-matter, from a study of the drawings, the disclosure, and the appended claims. In the claims, the word “comprising” does not exclude other elements or steps, and the indefinite article “a” or “an” does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0067] The reference signs used in the claims shall not be construed as limiting the scope. Unless otherwise indicated, the drawings are intended to be read (e.g., cross-hatching, arrangement of parts, proportion, degree, etc.) together with the specification, and are to be considered a portion of the entire written description of this disclosure. As used in the description, the terms “horizontal”, “vertical”, “left”, “right”, “up” and “down”, as well as adjectival and adverbial derivatives thereof (e.g., “horizontally”, “rightwardly”, “upwardly”, etc.), simply refer to the orientation of the illustrated structure as the particular drawing figure faces the reader. Similarly, the terms “inwardly” and “outwardly” generally refer to the orientation of a surface relative to its axis of elongation, or axis of rotation, as appropriate.

Claims

CLAIMS1. An optical image stabilization assembly (1) for an optical unit (2) having an optical axis (OA), said optical image stabilization assembly (1) comprising a stabilization unit (3) configured to move said optical unit (2) in a plane (P) perpendicular to said optical axis (OA), said stabilization unit (3) comprising:- a base (4);-a first pivotable element (5) configured to pivot around a first pivot axis (PAI) relative said base (4);-a second pivotable element (6) configured to pivot around a second pivot axis (PA2) relative said first pivotable element (5), said second pivotable element (6) being configured to accommodate said optical unit (2), said first pivot axis (PAI), said second pivot axis (PA2), and said optical axis (OA) extending in parallel;-a first actuator (7) configured to pivot said first pivotable element (5) around said first pivot axis (PAI); and -a second actuator (8) configured to pivot said second pivotable element (6) around said second pivot axis (PA2).

2. The optical image stabilization assembly (1) according to claim 1, wherein said first pivot axis (PAI) and said first actuator (7) are arranged along a first common diagonal (DI), said first common diagonal (DI) intersecting said optical axis (OA), said first pivot axis (PAI) and said first actuator (7) being arranged at opposite sides of said optical axis (OA); and wherein said second pivot axis (PA2) and said second actuator (8) are arranged along a second common diagonal (D2), said second common diagonal (D2) intersecting said optical axis (OA), said second pivot axis (PA2) and said second actuator (8) being arranged at opposite sides of said optical axis (OA), said first common diagonal (DI) and said second common diagonal (D2) extending perpendicular to each other.

3. The optical image stabilization assembly (1) according to claim 2, wherein a distance between said first pivot axis (PAI) and said first actuator (7) along said first common diagonal (DI) and a distance between said second pivot axis (PA2) and said second actuator (8) along said second common diagonal (D2) is a first distance (dl), and wherein a distance between said first pivot axis (PAI) and said optical axis (OA) along said first common diagonal (D 1) and a distance between said second pivot axis (PA2) and said optical axis (OA) along said second common diagonal (D2) is a second distance (d2), said second distance (d2) being substantially 50 % of said first distance (dl).

4. The optical image stabilization assembly (1) according to any one of the previous claims, wherein said first actuator (7) and said second actuator (8) are based on electromagnetic, shape memory alloy, or piezo technology.

5. The optical image stabilization assembly (1) according to any one of the previous claims, wherein said first actuator (7) and / or said second actuator (8) comprises a location sensor (9).

6. The optical image stabilization assembly (1) according to any one of the previous claims, wherein said base (4) is operably connected to a printed circuit board (10) providing electric signals to said first actuator (7) and said second actuator (8).

7. The optical image stabilization assembly (1) according to claim 6, wherein said first actuator (7) comprises a first magnet (7a) attached to said first pivotable element (5) and first coils (7b) attached to said printed circuit board (10), said first magnet (7a) being arranged between said first coils (7b), and wherein said second actuator (8) comprises a second magnet (8a) attached to said second pivotable element (6) and second coils (8b) attached to said printed circuit board (10), said second magnet (8a) being arranged between said second coils (8b).

8. The optical image stabilization assembly (1) according to any one of the previous claims, wherein said first pivotable element (5) is operably connected to said base (4) by means of a first pivot shaft (11) extending along said first pivot axis (PAI) and said second pivotable element (6) is operably connected to said first pivotable element (5) by means of a second pivot shaft(12) extending along said second pivot axis (PA2).

9. The optical image stabilization assembly (1) according to claim 8, wherein said first pivot shaft (11) is fixed to said base(4), said first pivotable element (5) being pivotally connected to said first pivot shaft (11) by means of a mechanical fastener(13), and said second pivot shaft (12) is fixed to said first pivotable element (5), said second pivotable element (6) being pivotally connected to said second pivot shaft (12) by means of a mechanical fastener (13).

10. The optical image stabilization assembly (1) according to any one of the previous claims, wherein said first pivotable element (5) comprises a first contact surface (5a) configured to be in contact with a first reduced friction surface (4a) of said base (4), and wherein said second pivotable element (6) comprises a second contact surface (6a) configured to be in contact with a second reduced friction surface (4b) of said base (4).

11. The optical image stabilization assembly (1) according to any one of claims 2 to 10, wherein said first pivotable element(5) comprises a first counterweight (14) arranged along said first common diagonal (DI), said first counterweight (14) and said first actuator (7) being arranged at opposite sides of said first pivot axis (PAI), and wherein said second pivotable element (6) comprises a second counterweight (15) arranged along said second common diagonal (D2), said second counterweight (15) and said second actuator (8) being arranged at opposite sides of said second pivot axis (PA2).

12. An optical system (16) for an electronic apparatus (18) comprising the optical image stabilization assembly (1) according to any one of claims 1 to 11 and an optical unit (2) having an optical axis (OA), said optical unit (2) comprising at least one lens.

13. The optical system (16) according to claim 12, further comprising an autofocus assembly (17) configured to move said optical unit (2) along said optical axis (OA), the second pivotable element (6) of said optical image stabilization assembly (1) accommodating said autofocus assembly (17).

14. An electronic apparatus (18) comprising the optical system (16) according to claim 12 or 13.

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