TWI578094B - Optical image stabilization mechanism - Google Patents

Description

Optical image anti-shock mechanism

The invention relates to an anti-vibration mechanism, in particular to an optical image anti-vibration mechanism for carrying a lens.

In general, a camera, a camera, or a mobile phone is often subjected to an external force, causing the internal optical system to sway, which may easily cause the light path to shift and the captured image may be blurred. The optical image anti-shock device is disclosed in the patent document TW I457693. When the auto-focusing is performed, the internal coil is energized to interact with the corresponding magnet, so that the lens-carrying portion fixed to the coil can be moved along the optical axis of the lens to achieve The effect of autofocus, wherein an X-axis and a Y-axis displacement sensor are further disposed in the optical image anti-vibration device, thereby sensing the position of the optical axis in the X-axis and the Y-axis direction, and then respectively transmitting corresponding to the X-axis And the Y-axis coil and magnet generate electromagnetic induction to adjust the lens to the correct position, so that the horizontal offset of the optical axis in the X-axis and Y-axis directions can be corrected to achieve shockproof effect and obtain better image quality. . However, due to the size limitations of the coil and the corresponding magnet, it is often difficult to reduce the volume of the conventional anti-vibration device.

In order to overcome the above problems, the present invention provides an optical image anti-shock mechanism, which can be used to carry a lens carrier, a frame, a substrate, a first coil, a second coil, a displacement sensing component, a first magnetic element, a second magnetic element and a third magnetic element. The frame is movably coupled to the carrier and the substrate. The first coil is disposed on one side of the carrier, the second coil is disposed on the substrate, and the first and second magnetic elements are disposed on the frame and correspond to the first coil, and the magnetic poles of the two are opposite in direction. The third magnetic element is disposed on the frame and corresponds to the second coil, and the displacement sensing element is disposed on the substrate for sensing a relative displacement between the lens and the substrate.

In one embodiment, the first magnetic element and the second magnetic element form a multi-polar permanent magnet integrally formed.

In one embodiment, the third magnetic element has a permanent magnet.

In one embodiment, the volume of the third magnetic element is less than or equal to the multi-polar permanent magnet.

In an embodiment, the carrier has a protrusion formed on one side of the carrier, and the first coil surrounds the protrusion.

In one embodiment, the first coil includes an upper half and a lower half, wherein the upper half corresponds to the first magnetic element and the lower half corresponds to the second magnetic element.

In one embodiment, when a current flows into the first coil, electromagnetic induction is generated between the first coil and the first and second magnetic elements to move the carrier relative to the substrate in the optical axis direction of the lens.

In an embodiment, the first coil has an elliptical structure.

In one embodiment, the substrate is substantially perpendicular to the optical axis of the lens.

In an embodiment, the aforementioned frame has a rectangular, hexagonal or octagonal structure.

10‧‧‧Hosting

11‧‧‧Protruding

20‧‧‧Frame

30‧‧‧Substrate

40‧‧‧Upper reed

50‧‧‧Reed

60‧‧‧ring loop

70‧‧‧ optical axis

C1‧‧‧first coil

Upper part of C11‧‧‧

C12‧‧‧ lower half

C21, C22‧‧‧ second coil

M1‧‧‧First magnetic component

M2‧‧‧Second magnetic component

M3‧‧‧ third magnetic component

M4‧‧‧ multipole magnet

N, S‧‧‧ magnetic pole

R‧‧‧ Space

Fig. 1 is a view showing an exploded view of an optical image vibration-proof mechanism according to an embodiment of the present invention.

Fig. 2 is a schematic view showing the combination of the optical image anti-vibration mechanism of Fig. 1.

Fig. 3 is a cross-sectional view taken along line A-A of Fig. 2.

Fig. 4 is a view showing the positional relationship between the first, second, and third magnetic members M1, M2, M3 and the first coil C1.

Fig. 5 is a view showing a single one-pole multi-pole permanent magnet M4 formed in an integral manner to replace the first and second magnetic elements M1 and M2.

Fig. 6 is a view showing the multipolar permanent magnet M4 in Fig. 5.

Fig. 7 is a cross-sectional view taken along line B-B of Fig. 2.

The preferred embodiment of the invention is described in conjunction with the drawings.

The above and other technical contents, features and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only directions referring to the additional drawings. Therefore, the directional terminology used is for the purpose of illustration and not limitation.

First, please refer to FIG. 1 to FIG. 3 together. The optical image anti-vibration mechanism according to an embodiment of the present invention can be disposed, for example, in a camera (or an electronic device having a camera function), which can be used to prevent or suppress shooting caused by camera shake. The problem of blurred images. As can be seen from the first to third figures, the optical image anti-vibration mechanism mainly includes a carrier 10, a rectangular frame 20, a substrate 30, an upper reed 40, a lower reed 50, and a plurality of rings 50. a plurality of first coils C1, a plurality of second coils C21, C22, a plurality of first magnetic elements M1, and a plurality of second magnetic elements M2 And a plurality of third magnetic elements M3, wherein the first and second coils C1, C21, and C22 may have an elliptical structure. It should be understood that an image sensor (such as a CCD, not shown) fixed to the substrate 30 is disposed under the substrate 30, and an optical lens corresponding to one of the image sensors is disposed inside the carrier 10 ( Not shown), wherein the substrate 30 is substantially perpendicular to the optical axis 70 of the lens, and the optical lens and the image sensor can be used to perform a photographing or photographing function, and between the optical lens and the image sensor. By setting the optical image anti-vibration mechanism, the horizontal offset of the lens and its optical axis 70 in the X-axis and Y-axis directions can be corrected in time to achieve the anti-vibration effect and obtain better image quality.

As shown in FIG. 1, the carrier 10 has a space R for accommodating an optical lens. The pair of first magnetic elements M1 have an elongated structure and are disposed on the frame 20, and the pair of first magnetic elements M1 are located. The opposite side of the optical axis 70, wherein the magnetic pole direction (NS) of the first magnetic element M1 is parallel to the X-axis direction, and the pair of second magnetic elements M2 also have an elongated structure and are disposed on the frame 20, respectively Positioned below the first magnetic element M1, and the longitudinal axis direction (parallel to the Y axis) of the second magnetic element M2 is parallel to the longitudinal axis direction (parallel to the Y axis) of the first magnetic element M1, wherein the second magnetic element M2 The magnetic pole direction (NS) is parallel to the X-axis direction, but opposite to the magnetic pole direction of the first magnetic element M1. As can be seen from Fig. 1, a pair of third magnetic elements M3 have an elongated structure which is disposed on the frame 20, wherein the third magnetic element M3 is located on the opposite side of the optical axis 70, and the third magnetic element M3 The longitudinal axis direction (parallel to the X axis), the longitudinal axis direction of the first magnetic element M1 (parallel to the Y axis), and the direction of the optical axis 70 (parallel to the Z axis) are perpendicular to each other, wherein the magnetic pole of the third magnetic element M3 The direction (NS) is parallel to the Y-axis direction, and the third magnetic element M3 and the aforementioned first and second magnetic elements M1, M2 are respectively disposed on different sides of the rectangular frame 20. It should be understood that this The frame 20 in the embodiment has a rectangular or square structure, however, it may have a polygonal structure such as a hexagon or an octagon, and the two third magnetic elements M3 need only be disposed on the opposite side of the frame 20.

Continuing to refer to FIGS. 1 to 3 , the opposite sides of the carrier 10 are respectively formed with a protrusion 11 , wherein the first coil C1 surrounds the protrusion 11 and is fixed to the carrier 10 . As shown in the first and third figures, the first coil C1 includes an upper half C11 and a lower half C12, wherein the upper half C11 corresponds to the first magnetic element M1 and the lower half C12 corresponds to the second magnetic Element M2. In addition, the two groups respectively extend along the Y-axis and the X-axis direction, and the pair of second coils C21 and C22 are disposed on the substrate 30, and respectively correspond to the second and third magnetic elements M2 and M3, wherein a sense of displacement A measuring component (not shown) is embedded on the substrate 30 for sensing relative motion between the carrier 10 and the substrate 30.

It should be particularly noted that the carrier 10 is connected to the upper reed 40, and the upper reed 40 is coupled to the frame 20. Further, the carrier 10 is coupled to the lower reed 50, and the lower reed 50 is coupled to the frame 20. In this way, when the frame 20 is impacted by an external force, the carrier 10 can be displaced in the Z-axis direction relative to the frame 20 through the upper and lower reeds 40, 50, thereby generating a buffer in the vertical direction (Z-axis direction). The effect is to avoid damage to the carrier 10 and the lens housed therein. In addition, in this embodiment, one end of the loop wire 60 can be connected to the frame 20 through solder, for example, and the other end can be connected to the substrate 30 through solder, for example, so that when the frame 20 is impacted by an external force, the frame 20 can be opposite to the substrate 30. Displacement in the XY plane, which in turn produces a buffering effect in the horizontal direction.

Specifically, since the carrier 10 is connected to the frame 20 through the upper reed 40 and the lower reed 50, and the upper reed 40 and the lower reed 50 are made of an elastic material (for example, a metal dome), the load can be restricted. The direction of movement of the seat 10 is parallel to the direction of the optical axis 70 of the lens. In addition, since the substrate 30 is connected to the frame 20 by a loop wire 60, and the loop wire 60 Made of elastic material (for example, elastic metal rod), the frame 20, the carrier 10 and the first, second and third magnetic elements M1, M2, M3 disposed on the frame 20 can be supported by the eyelet 60. And thereby forming a suspension mechanism, so that when the frame 20 is struck by an external force, the frame 20 can be displaced relative to the substrate 30 in the XY plane to achieve the buffering effect.

It should be particularly noted that when the optical image anti-vibration mechanism is in a focus state, current can be input from a power source to the first coil C1, so that the first magnetic element M1 and the second magnetic element M2 generate electromagnetic induction to the first coil C1. At this time, the carrier 10 fixed to the first coil C1 can be moved in the direction of the optical axis 70 to quickly bring the lens into focus.

On the other hand, when the user vibrates the camera to cause the optical axis 70 to be offset relative to the substrate 30, the horizontal displacement (parallel to the XY plane) between the frame 20 and the substrate 30 can be sensed via the displacement sensing element on the substrate 30. In order to know the offset between the position of the optical axis 70 and the correct position; further, when the lens and its optical axis 70 are to be corrected to the correct position, current can be applied to the second coil C21, so that Electromagnetic induction is generated between the second coil 21 and the second magnetic element M2 corresponding thereto to drive the second magnetic element M2 and the frame 20 to be displaced in the X-axis direction with respect to the substrate 30. Similarly, when a current is applied to the other set of second coils C22, the second coil C22 generates electromagnetic induction with the third magnetic element M3 corresponding to the position thereof, and the third magnetic element M3 and the frame 20 are opposed to the substrate 30. Moving in the Y-axis direction, thereby controlling the displacement of the lens and its optical axis 70 in the XY plane to achieve offset compensation and shock-proof effects.

Next, referring to FIG. 4, the first magnetic element M1 and the second magnetic element M2 may adopt two permanent magnets and have their magnetic poles disposed in opposite directions; or, as shown in FIGS. 5 and 6, the foregoing may also be used. First and second magnetic elements M1, M2 It is produced by integral molding to form a single multi-polar permanent magnet M4, wherein it can be clearly seen from FIG. 6 that the upper and lower portions of the multi-polar permanent magnet M4 are formed in opposite directions in a direction parallel to the X-axis. Two sets of magnetic poles (NS, SN), which can replace two independent magnets with a single magnet to reduce material cost and assembly procedure, which can greatly reduce production costs. Referring to FIG. 7 , the third magnetic element M3 can adopt a permanent magnet. Since its position only needs to correspond to the second coil C22 on the substrate 30, it is not necessary to additionally provide a third magnetic element M3 on the carrier 10. Corresponding to other coils, the size of the optical image anti-vibration mechanism in the Y-axis direction can be effectively reduced, so that the overall volume of the optical image anti-vibration mechanism is reduced, thereby making it possible to achieve miniaturization, weight reduction, and more energy saving. .

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be practiced without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

10‧‧‧Hosting

11‧‧‧Protruding

20‧‧‧Frame

30‧‧‧Substrate

40‧‧‧Upper reed

50‧‧‧Reed

60‧‧‧ring loop

70‧‧‧ optical axis

C1‧‧‧first coil

Upper part of C11‧‧‧

C12‧‧‧ lower half

C21, C22‧‧‧ second coil

M1‧‧‧First magnetic component

M2‧‧‧Second magnetic component

M3‧‧‧ third magnetic component

R‧‧‧ Space

Claims (10)

An optical image anti-vibration mechanism for carrying a lens, comprising: a carrier, wherein the lens is disposed in the carrier; a frame movably connecting the carrier and having a polygonal structure; a substrate movably connecting the lens a displacement sensing component disposed on the substrate for sensing relative movement between the lens and the substrate; a first coil disposed on the carrier; a second coil disposed on the substrate a first magnetic element disposed on the frame and corresponding to the first coil; a second magnetic element disposed on the frame and corresponding to the first and second coils, wherein the magnetic direction of the second magnetic element In opposite to the magnetic pole direction of the first magnetic element, when a current flows into the first coil, electromagnetic induction is generated between the first coil and the first and second magnetic elements, so that the carrier is opposite to the substrate One of the lenses moves in the direction of the optical axis; and a third magnetic element is disposed on the frame and corresponds to the second coil. When a current flows into the second coil, the second coil and the second coil Electromagnetic induction between the three magnetic elements, so that the substrate is moved relative to the frame in a direction substantially perpendicular to the direction of the optical axis. The optical image anti-vibration mechanism according to claim 1, wherein the first magnetic element and the second magnetic element form a multi-polar permanent magnet integrally formed. The optical image anti-vibration mechanism of claim 2, wherein the third magnetic element has a permanent magnet. The optical image anti-vibration mechanism of claim 3, wherein the third magnetic element has a volume less than or equal to the multi-polar permanent magnet. The optical image anti-vibration mechanism of claim 1, wherein the carrier has a protrusion formed on one side of the carrier, and the first coil surrounds the protrusion. The optical image anti-vibration mechanism of claim 1 or 2, wherein the first coil comprises an upper half and a lower half, wherein the upper half corresponds to the first magnetic element, and the lower half Corresponding to the second magnetic element. The optical image anti-vibration mechanism of claim 1, wherein the optical image anti-vibration mechanism further comprises: a pair of elongated first magnetic elements disposed on the frame and located on opposite sides of the optical axis; a pair of strip-shaped second magnetic elements are disposed on the frame and are respectively located under the first magnetic elements, wherein longitudinal axes of the second magnetic elements are parallel to the longitudinal of the first magnetic elements Axis direction. The optical image anti-vibration mechanism of claim 7, wherein the optical image anti-vibration mechanism further comprises: a pair of elongated third magnetic elements disposed on the frame and located on opposite sides of the optical axis, The longitudinal axis direction of the third magnetic elements, the longitudinal axis direction of the first magnetic elements, and the direction of the optical axis are perpendicular to each other. The optical image anti-vibration mechanism of claim 1, wherein the first coil has an elliptical structure. The optical image anti-vibration mechanism of claim 1, wherein the frame has a rectangular, hexagonal or octagonal structure.