Shake compensation device

Abstract

The present application provides an optical device, a shake compensation device, a camera device and an electronic device with shake suppression function, which can perform accurate shake suppression. The optical device includes a first prism (16) with a reflecting surface (30) that bends light incident from a Z direction to an X direction, a second prism (18) with a reflecting surface (36) that bends the X direction light bent by the first prism (16) to a Y direction, a first moving assembly (20) that moves the first prism (16) to the normal direction of the reflecting surface (30) of the first prism (16), and a second moving assembly (22) that moves the second prism (18) to the normal direction of the reflecting surface (36) of the second prism (18) in an XYZ three-dimensional orthogonal coordinate system.

Description

Technical Field

[0001] This invention relates to a jitter compensation device. Background Technology

[0002] As electronic devices such as smartphones become thinner and lighter, the camera structures currently under development use prisms to bend incident light in a direction parallel to the device's housing, which can accommodate the structure required for a high-magnification optical zoom lens. On the other hand, in such cameras, the higher the magnification of the optical zoom lens, the more sensitive it is to vibration. Therefore, shake compensation technology is needed to compensate for shake and stabilize image quality.

[0003] Patent Document 1 below illustrates an example of a device for performing such shake compensation. In this shake compensation device, two prisms are fixed on a prism carrier, and shake compensation is performed by moving the prism carrier in the direction of incident light from the subject and in the direction of outgoing light exiting the lens.

[0004] [Existing Technical Documents] [Patent Documents] [Patent Document 1] Chinese Patent Application Publication No. CN113031191A Specification Summary of the Invention

[0005] [The technical problem this invention aims to solve] However, when the structure involves fixing two prisms onto a single prism carrier, a problem arises: the movable part becomes heavier. Furthermore, the amount of movement of the emitted light increases relative to the amount of prism movement, making accurate jitter compensation difficult.

[0006] The present invention provides an optical device, a shake compensation device, a photographic device, and an electronic device with shake suppression function and capable of accurate shake suppression.

[0007] [Technical Solution] One embodiment of the present invention is an optical device, which, in a three-dimensional Cartesian coordinate system XYX, includes a first prism having a reflecting surface that bends light incident from the Z direction toward the X direction, a second prism having a reflecting surface that bends light from the X direction, which is bent by the first prism, toward the Y direction, a first moving component that moves the first prism toward the normal direction of the reflecting surface of the first prism, and a second moving component that moves the second prism toward the normal direction of the reflecting surface of the second prism.

[0008] Furthermore, preferably, at least one of the first moving component and the second moving component includes a driving part having a yoke, a magnet, and a coil. When the first moving component includes the driving part, when viewed from the normal direction of the reflecting surface of the first prism, the center of the reflecting surface of the first prism coincides with the center of the driving part of the first moving component. When the second moving component includes the driving part, when viewed from the normal direction of the reflecting surface of the second prism, the center of the reflecting surface of the second prism coincides with the center of the driving part of the second moving component. The yoke is flat and has protruding ends at both ends. The magnet is fixed to the central part of the yoke, allowing a gap to be provided between its two sides and the protruding ends. The two straight portions of the coil are disposed between the gaps.

[0009] Furthermore, preferably, the first moving component further deflects the first prism around the axis in the Y direction, and the second moving component further deflects the second prism around the axis in the Z direction.

[0010] Furthermore, preferably, the driving unit includes two sets of driving unit combinations having the yoke, the magnet, and the coil. When the first moving component includes the driving unit, one set of the two sets of driving unit combinations is configured on the light incident side of the reflecting surface of the first prism, and the other set is configured on the light emitting side of the reflecting surface of the first prism. When the second moving component includes the driving unit, one set of the two sets of driving unit combinations is configured on the light incident side of the reflecting surface of the second prism, and the other set is configured on the light emitting side of the reflecting surface of the second prism.

[0011] Other embodiments of the present invention are jitter compensation devices for optical devices having the aforementioned embodiments.

[0012] Furthermore, preferably, the shake compensation device has an image sensor that detects light from the subject, and a lens assembly on the image sensor that images the light from the subject, the lens assembly and the image sensor being disposed after the first prism and the second prism.

[0013] Furthermore, preferably, the shake compensation device has an image sensor that detects light from the subject, and a lens assembly on the image sensor that images the light from the subject, the lens assembly being disposed between the first prism and the second prism, the second prism being disposed between the lens assembly and the image sensor.

[0014] Another embodiment of the present invention is a photographic apparatus having the aforementioned shake compensation device.

[0015] Other embodiments of the present invention are electronic devices having the photographic apparatus described above.

[0016] [Invention Effects] According to the present invention, the two prisms are moved in the direction normal to their reflecting surfaces, so the movable part is light and the amount of movement of the emitted light is large relative to the amount of movement of the prisms. Therefore, it is possible to provide optical devices, jitter compensation devices, photographic devices, and electronic devices with jitter suppression functions that can accurately suppress jitter. Attached Figure Description

[0017] 【 Figure 1 This is a perspective view of the jitter compensation device according to the embodiment of the present invention, viewed from an oblique angle.

[0018] [Figure 2] is an oblique view of the jitter compensation device in Figure 1 as viewed from other directions.

[0019] [Figure 3] is an exploded perspective view showing the structure of the driving prism in the jitter compensation device of Figure 1.

[0020] [Figure 4] Figure 4(A) is an explanatory diagram showing the movement of the optical axis as the prism moves in this embodiment. Figure 4(B) is an explanatory diagram showing the relationship between the moving distance of the prism and the moving distance of the optical axis when the prism is moved in the direction of the incident light optical axis.

[0021] [Figure 5] is an exploded perspective view showing the structure of the driving prism in the jitter compensation device of the second embodiment of the present invention.

[0022] [Figure 6] Figure 6(A) is an explanatory diagram showing the situation where the reflecting surface of the prism is tilted in the device of Figure 5; Figure 6(B) is an explanatory diagram showing the situation where the reflecting surface of the prism is tilted and moved backward in the device of Figure 5; Figure 6(C) is an explanatory diagram showing the situation where the reflecting surface of the prism is tilted and moved forward in the device of Figure 5.

[0023] [Figure 7] is an oblique view of the jitter compensation device in the third embodiment of the present invention. Detailed Implementation

[0024] The embodiments of the present invention will now be described with reference to the drawings. Furthermore, the following embodiments are illustrative examples of the optical device, shake compensation device, photographic device, and electronic device of the present invention, and are not intended to limit the present invention to the following embodiments.

[0025] [First Implementation] The mechanism of the jitter compensation device according to the first embodiment will be described with reference to Figures 1-3. The jitter compensation device 10 includes a lens assembly 12, an image sensor 14, a first prism 16, a second prism 18, a first moving assembly 20 for driving the first prism 16, and a second moving assembly 22 for driving the second prism 18. The first moving assembly 20, the second moving assembly 22, the lens assembly 12, and the image sensor 14 are respectively disposed on a base 24, and the first lens body 26 is disposed above the first prism 16. The first prism 16 is disposed on the first moving assembly 20, and the second prism 18 is disposed on the second moving assembly 22.

[0026] Furthermore, for convenience, in this specification, the optical axis direction (the direction of incident light) of the first lens body 26, which is positioned with the base 24 as a reference, is referred to as the Z direction. The direction orthogonal to the Z direction and in which the incident light is bent by the first prism 16 is referred to as the X direction, and the direction of the outgoing light from the second prism 18, which is orthogonal to both the Z and X directions, is referred to as the Y direction. The incident light side of the first prism body 26 is referred to as the upper side, and the opposite side as the lower side.

[0027] The lens assembly 12 that images light from the subject onto the image sensor 14 is a zoom lens that changes the focal distance of the light, but it could also simply be a focusing lens for focusing light onto the image sensor 14. The image sensor 14 detects the light from the subject. In this first embodiment, the lens assembly 12 and the image sensor 14 are positioned downstream of the second prism 18, i.e., downstream of the optical system.

[0028] The first prism 16 is a right-angled isosceles triangular prism with three planes: a first incident surface 28, a first reflecting surface 30, and a first exiting surface 32. The first prism 16 is configured such that the first incident surface 28 has its normal direction in the Z direction, the first exiting surface 32 has its normal direction in the X direction, and the first reflecting surface 30 has its normal direction in the ZX direction, which is tilted at 45 degrees regardless of whether the light is incident from the Z or X direction. The first reflecting surface 30 bends light incident from the Z direction through the first incident surface 28 towards the X direction, causing it to exit from the first exiting surface 32.

[0029] The second prism 18 is a right-angled isosceles triangular prism with three planes: a second incident surface 34, a second reflecting surface 36, and a second exiting surface 38. The second prism 18 is configured such that the second incident surface 34 is normal to the X-direction, the second exiting surface 38 is normal to the Y-direction, and the second reflecting surface 36 is normal to the XY direction, which is tilted at 45 degrees regardless of whether it is from the X or Y direction. The second reflecting surface 36 causes light rays in the X direction, which are bent by the first prism 16 and enter through the second incident surface 34, to bend in the Y direction and exit from the second exiting surface 38.

[0030] In this embodiment, the first prism 16 and the second prism 18 are arranged such that the first exit surface 32 and the second incident surface 34 face each other with a predetermined gap between them. The first moving assembly 20 moves the first prism 16 along the normal direction of the first reflecting surface 30. The second moving assembly 22 moves the second prism 18 along the normal direction of the second reflecting surface 36. Hereafter, in the description of the first moving assembly 20 and the second moving assembly 22, the first moving assembly 20 or the second moving assembly 22 will be referred to as moving assembly 20, the mounted first prism 16 or the second prism 18 will be referred to as prism 16, the first reflecting surface 30 or the second reflecting surface 36 of prism 16 will be referred to as reflecting surface 30, the hypotenuse direction of the right isosceles triangle of prism 16 will be referred to as hypotenuse direction, and the height direction of the triangular prism of prism 16 will be referred to as height direction.

[0031] The structure of the moving component 20 includes a fixing component 42, a yoke 44, a magnet 46, a prism support 48, a spring component 50, and a coil 52. The fixing component 42 is a flat plate forming a quadrangular shape, with ends 54, 54 protruding towards the prism 16 at both ends in the height direction. The plate surface of the fixing component 42 of the first moving component 20 has a lower height in the Z direction on the +X side and a higher height in the Z direction on the -X side, and is fixed to the tilting platform 40, forming an angle of 45° between it and the base 24. The plate surface of the fixing component 42 of the second moving component 22 is perpendicular to the base 24 and is fixed to the base 24, with its normal pointing towards the midpoint of the Y and -X directions at 45 degrees.

[0032] The yoke 44 is fixed to the plate surface of the fixing member 42. The yoke 44 is formed of a magnetic, square-shaped plate of metal, with protruding ends 56, 56 at both ends of the metal plate in the hypotenuse direction, protruding toward the prism 16. A square-shaped, plate-shaped magnet 46 of a specified wall thickness is placed in the center of the yoke 44. In the hypotenuse direction, gaps 70, 70 are provided between the magnet 46 and the protruding ends 56, 56. The magnet 46 is magnetized, so that one side of its plate surface is S-type and the other side is N-type.

[0033] The prism support 48 is a quadrangular frame shape with an opening 58 in the central part, and the prism 16 is mounted on it. Furthermore, spring components 50, 50 are connected to the ends 54 of the fixing member 42 in the height direction of the prism support 48. The central part 60 of each spring component 50 is connected to the central part of the end portions 62, 62 in the height direction of the prism support 48, and the end portions 62, 62 are connected to the two ends 64, 64 of the fixing member 42. Thus, the prism support 48 is supported while suspended from the fixing member 42, the yoke 44, and the magnet 46, and can move freely in the normal direction of the reflecting surface 30.

[0034] Furthermore, the coil 52 is embedded within the opening 58 of the prism support 48, creating gaps 66, 66 on both sides in the direction of the oblique edge. When assembling the moving assembly 20, viewed from the normal direction of the reflecting surface 30, a magnet 46 is arranged on the inner circumference of the coil 52, gaps 70, 70 have portions extending linearly in the height direction of the coil 52, and protruding ends 56, 56 of the yoke 44 are arranged within gaps 66, 66. The combination of the yoke 44, magnet 46, and coil 52 constitutes the driving unit. The prism 16 is mounted on the moving assembly 20, and viewed from the normal direction of the reflecting surface 30, the center of the driving unit coincides with the center of the reflecting surface 30.

[0035] The magnetic flux formed by the magnet 46 and the protruding ends 56, 56 of the yoke 44 is parallel to the reflecting surface 30 of the prism 16 and orthogonal to the straight extension of the coil 52 in the height direction. When the coil 52 is energized, the straight extension of the coil 52 in the height direction generates a Lorentz force in the normal direction of the reflecting surface 30. As a result, the prism support 48, which fixes the coil 52, moves together with the prism 16 in the direction of the normal of the reflecting surface 30, supported by the fixing member 42 via the spring member 50.

[0036] Through the first moving component 20 and the second moving component 22 described above, the first prism 16 and the second prism 18 can move independently in the normal direction of the first reflecting surface 30 of the first prism 16 and the normal direction of the second reflecting surface 36 of the second prism, respectively. This allows for a lighter movable part and improves the response accuracy relative to the incident light.

[0037] The relationship between the movement of the first prism 16 and the second prism 18 (hereinafter collectively referred to as prisms 16 and 18) and the movement of the optical axis will be explained below with reference to Figures 4(A) and 4(B). In Figures 4(A) and (B), the dashed lines represent the positions of prisms 16 and 18 before movement, and the solid lines represent the positions after movement. In the state before movement, incident light I is incident from the first incident surface 28 and the second incident surface 34 (hereinafter collectively referred to as incident surfaces 28 and 34) of prisms 16 and 18. Incident light I is reflected at a right angle at the reflection point Rf0 of the first reflecting surface 30 and the second reflecting surface 36 (hereinafter collectively referred to as reflecting surfaces 30 and 36), and exits from the first exit surface 32 and the second exit surface 38 (hereinafter collectively referred to as exit surfaces 32 and 38) as exit light O.

[0038] As shown in Figure 4(A), prisms 16 and 18 are moved only a distance L in the direction of normal to reflecting surfaces 30 and 36. Incident light I is reflected at reflection point Rf1 and emitted as outgoing light O1. At this time, outgoing light O1 is moved only a distance √2L relative to outgoing light O in the direction of normal to incident surfaces 28 and 34.

[0039] As shown in Figure 4(B), prisms 16 and 18 are moved only a distance L in the direction normal to the incident surfaces 28 and 34. The incident light I is reflected at the reflection point Rf2 and emitted as the outgoing light O2. At this time, the outgoing light O2 is moved only a distance L relative to the outgoing light O in the direction normal to the incident surfaces 28 and 34. The same situation applies when prisms 16 and 18 are moved only a distance K in the direction normal to the exit surfaces 32 and 38.

[0040] Thus, as in this first embodiment, by moving prisms 16 and 18 toward the normal direction of reflecting surfaces 30 and 36, the position of the emitted light can be moved by √2 times more than when they are moved toward the normal direction of incident surfaces 28 and 34 or exit surfaces 32 and 38. Therefore, in this first embodiment, the amount of movement of the emitted light can be increased relative to the amount of movement of prisms 16 and 18. In other words, the same amount of movement distance as the emitted light can be obtained with a smaller driving force than when prisms 16 and 18 are moved toward the direction of incident light. As described above, in the jitter compensation device of this first embodiment, the two prisms 16 and 18 are moved toward the normal direction of reflecting surfaces 30 and 36 respectively, so the movable part is light, and the amount of movement of the emitted light is greater relative to the amount of movement of prisms 16 and 18. Therefore, the jitter compensation device of this first embodiment has a jitter suppression function that can accurately suppress jitter.

[0041] [Second Implementation] The jitter compensation device of the second embodiment will now be described with reference to Figures 5 and 6(A)-6(C). Compared to the jitter compensation device of the first embodiment, the jitter compensation device of the second embodiment differs only in the structure of the yoke, magnet, and coil of the first and second moving components; the overall structure of other parts is largely the same. Therefore, components with the same function will be described using the same reference numerals, and their detailed descriptions will be omitted. Furthermore, as with the first embodiment, the first moving component 20A and the second moving component 22A of the second embodiment are identical. Therefore, in the following description, the same substitutions as in the first embodiment will be used for explanation.

[0042] The moving component 20A includes a fixed component 42, two yokes 44A and 44B, two magnets 46A and 46B, a prism support 48, spring components 50 and 50, and two coils 52A and 52B. The drive assembly 72A of the yokes 44A, magnets 46A, and coils 52A, and the drive assembly 72B of the yokes 44B, magnets 46B, and coils 52B have the same structure as the assembly of the yokes 44, magnets 46, and coils 52 in the first embodiment, except that the dimension in the hypotenuse direction is smaller. These two sets of drive assembly 72A and 72B constitute drive assemblies arranged adjacent to each other in the hypotenuse direction. In this case, drive assembly 72A is arranged on the incident side, and drive assembly 72B is arranged on the exit side.

[0043] Two coils 52A and 52B are embedded in the opening 58 of the prism support 48, forming gaps 66A and 66B on both sides in the hypotenuse direction and gap 68 in the central portion. When the moving assembly 20A is assembled, viewed from the normal direction of the reflecting surface 30, a magnet 46A is arranged on the inner circumference of coil 52A, and a magnet 46B is arranged on the inner circumference of coil 52B. In the gaps 70A and 70A between the protruding end 56A of yoke 44A and magnet 46A, a portion extending linearly in the height direction of coil 52A is arranged; in the gaps 70B and 70B between the protruding end 56B of yoke 44B and magnet 46B, a portion extending linearly in the height direction of coil 52B is arranged. A protruding end 56A is arranged in gap 66A, a protruding end 56A and a protruding end 56B are arranged in gap 68, and a protruding end 56B is arranged in gap 66B. The prism 16 is mounted on the moving assembly 20A such that, when viewed from the normal direction of the reflecting surface 30, the center of the reflecting surface 30 is located on the boundary between the protruding ends 56A and 56B within the gap 68. That is, the center of the reflecting surface 30 coincides with the center of the driving part.

[0044] The drive assembly 72A drives the incident side of the reflecting surface 30 of the prism 16, that is, the side close to the incident surface 28, toward the normal direction of the reflecting surface 30. Furthermore, the drive assembly 72B drives the exit side of the reflecting surface 30 of the prism 16, that is, the side close to the exit surface 32, toward the normal direction of the reflecting surface 30. Thus, by controlling the current flowing through the coils 52A and 52B, the prism 16 can be moved parallel to the normal direction of the reflecting surface 30, deflected around in the height direction, or a combination of parallel and deflected movements.

[0045] In Figures 6(A)-6(C), the dashed lines represent the position of the first prism before it moves, and the solid lines represent the position after it moves. In Figure 6(A), the drive assembly 72A and drive assembly 72B generate a driving force of the same magnitude as the direction in which the prism 16 moves backward. For this purpose, the prism 16 moves backward in the direction normal to the reflecting surface 30.

[0046] In Figure 6(B), the drive assembly 72A generates a driving force in the direction that causes the prism 16 to retract, while the drive assembly 72B generates a driving force of the same magnitude in the direction that causes the prism 16 to advance. For this purpose, the prism 16 is tilted counterclockwise around an axis with the center of the reflecting surface 30 as its axial height direction.

[0047] In Figure 6(C), drive assembly 72A generates a driving force in the direction that causes prism 16 to retract, while drive assembly 72B generates a smaller driving force in the direction that causes prism 16 to advance. As a result, prism 16 moves backward toward the normal direction of reflecting surface 30, while simultaneously deflecting counterclockwise around the axis in the height direction.

[0048] Thus, in the jitter compensation device of the second embodiment, the drive component 20A controls the direction and magnitude of the current flowing through the coils 52A and 52B, which not only causes the prism 16 to move forward and backward along the normal direction of the reflecting surface 30, but also causes it to deflect around the axis in the height direction.

[0049] [Third Implementation] In the jitter compensation device 10 of the first and second embodiments, an example of an optical system in which the lens assembly 12 and the image sensor 14 are arranged downstream of the second prism 18 has been described. However, the present invention is not limited to the embodiments described above. Figure 7 Like the jitter compensation device 10C of the third embodiment shown, the lens assembly 12C can also be disposed between the first prism 16C and the second prism 18C. That is, the second prism 18C can also be disposed between the lens assembly 12C and the image sensor 14C.

[0050] Compared to the first and second embodiments, the third embodiment differs only in the placement of the second prism 18, so its detailed description is omitted. The structures of the first moving component 20C and the second moving component 22C in the third embodiment can also adopt the structures of the moving components in the first embodiment or the second embodiment. In the second embodiment, incident light along the Z direction passes through the first lens body 26C and enters the first incident surface 28C of the first prism 16C. It bends at a right angle in the X direction at the first reflecting surface 30C and exits from the first exit surface 32C. Then, it passes through the lens assembly 12C and enters the second incident surface 34C of the second prism 18C. It bends at a right angle in the Y direction at the second reflecting surface 36C and exits from the second exit surface 38C, reaching the image sensor 14C.

[0051] In the third embodiment, the second prism 18C is located downstream of the optical system of the lens assembly 12C, and therefore has excellent optical characteristics.

[0052] [Symbol Explanation] 10, 10C jitter compensation device 12, 12C lens assembly 14, 14C image sensor 16, 16C prisms, first prism 18, 18C Second Prism 20, 20A, 20C First moving components 22, 22C Second Moving Component 24 abutments 26, 26C First Lens Body 28, 28C Incident plane, first incident plane 30, 30C reflective surface, first reflective surface 32, 32C Exit Surface, First Exit Surface 34, 34C Incident surface, second incident surface 36, 36C Reflecting Surface, Second Reflecting Surface 38, 38C exit surface, second exit surface 40 Inclined support components 42 Fixed components 44, 44A, 44B yoke 46, 46A, 46B magnet 48 Prism Support 50 Spring Components 52, 52A, 52B coils 54 end 56, 56A, 56B protruding tablets 58 openings 60 Central Section 62 Both ends 64 Both ends Gap between 66, 66A, 66B, 68, and 70 70A and 70B drive unit assembly

Claims

1. A jitter compensation device, In the XYX three-dimensional rectangular coordinate system, including A first prism having a reflecting surface that bends light incident from the Z direction toward the X direction. A second prism having a reflecting surface that bends light in the X direction, which is bent by the first prism, in the Y direction; A first moving component that moves the first prism in the direction of the normal to the reflecting surface of the first prism. A second moving component that moves the second prism in the direction of the normal to the reflecting surface of the second prism. Image sensors that detect light from the subject A lens assembly for imaging light from the subject on the image sensor. At least one of the first moving component and the second moving component includes a drive unit having a yoke, a magnet, and a coil. When the first moving component includes the driving part, when viewed from the normal direction of the reflecting surface of the first prism, the center of the reflecting surface of the first prism coincides with the center of the driving part of the first moving component. When the second moving component includes the driving part, when viewed from the normal direction of the reflecting surface of the second prism, the center of the reflecting surface of the second prism coincides with the center of the driving part of the second moving component. The yoke is flat, with protruding ends at both ends. The magnet is fixed to the center of the yoke, allowing gaps to be provided between its two sides and the protruding end. The two straight sections of the coil are positioned between the gaps.

2. The jitter compensation device according to claim 1, characterized in that, The first prism and the second prism are triangular prisms of right-angled isosceles triangles. The driving unit includes two sets of driving unit assemblies having the yoke, the magnet, and the coil, the two sets of driving unit assemblies being arranged adjacent to each other along the hypotenuse of the right-angled isosceles triangle. When the first moving component includes the driving unit, one set of the two sets of driving units is configured on the side of the reflecting surface of the first prism close to the incident surface to drive that side to move in the normal direction of the reflecting surface, and the other set is configured on the side of the reflecting surface of the first prism close to the exit surface to drive that side to move in the normal direction of the reflecting surface. When the second moving component includes the driving part, one of the two sets of driving parts is arranged on the side of the reflecting surface of the second prism that is close to the incident surface to drive that side to move in the direction normal to the reflecting surface, and the other set is arranged on the side of the reflecting surface of the second prism that is close to the exit surface to drive that side to move in the direction normal to the reflecting surface.

3. The jitter compensation device according to any one of claims 1 or 2, characterized in that, The lens assembly and the image sensor are positioned after the first prism and the second prism.

4. The jitter compensation device according to any one of claims 1 or 2, characterized in that, The lens assembly is disposed between the first prism and the second prism, and the second prism is disposed between the lens assembly and the image sensor.

Images