TWI474041B - Image stabilizing module, image capturing module and electronic device - Google Patents

Description

Image stabilization module, image capturing module and electronic device

The present invention relates to an optical image stabilization technology, and more particularly to an image stabilization module capable of optical image stabilization and an image capturing module and an electronic device having the image stabilization module.

The image capture module controls the length of time the light is projected onto the image sensor by the shutter. For example, when the shutter speed is 1/2 second, the image sensor is sensitive to 1/2 second, if at 1/2 Within the second, due to the shaking, the same beam of light moves on the image sensor, and the image sensor records the movement of the light, making the captured picture blurred. In order to compensate for the amount of light offset caused by jitter, an image capturing module using an image stabilization system to prevent jitter began to appear in the 1990s. For details, see Cardani B. et al., April 2006, Control Systems Magazine, IEEE (Volume 26, Issue 2, Page(s): 21-22), "Optical image stabilization for digital cameras."

With the continuous development of digital camera technology, the camera body is often small and light, which is easy to cause hand shake, resulting in blurred images. The following three situations are prone to blurry images: First, long focal length shooting, because the long lens will magnify the camera's amplitude, slight jitter will also cause greater blur, so the impact of hand vibration on the picture clarity is more obvious than using a wide-angle lens. Second, shooting in low light environment, indoors, dusk and other weak light source environment, the camera will adjust the shutter speed to slower to increase the amount of light, so it is more prone to jitter; third, macro shooting, fine objects in the lens high magnification In the case of a slight vibration, it will become quite obvious. These conditions can cause jitter and blur the image. Since the distance of the captured object is much larger than the displacement of the camera, the main cause of image blur caused by the hand shake is the deflection of the camera itself, rather than the displacement of the camera itself, especially in the case of long-distance shooting. Therefore, the essence of the anti-shake technique is that during camera image correction, the camera shake causes the light to shift corresponding to the imaging position on the image capture module.

Therefore, it is necessary to provide an image stabilization module capable of preventing image shift due to camera shake during shooting, and an image capturing module and an electronic device having the image stabilization module.

An image stabilization module includes a fixed frame, a movable frame, a driving unit and an elastic component. The movable frame is located within the spacer and spaced from the holder. The driving unit includes a first magnetic component disposed on the mounting frame and a second magnetic component disposed on the movable frame, the first magnetic component being disposed opposite to the second magnetic component, wherein the driving component is configured by the first magnetic component And the second magnetic element generates a driving force to drive the movable frame to rotate relative to the fixed frame about the first axis and the second axis, the first axis being perpendicular to the second axis. The elastic member is elastically coupled between the fixing frame and the movable frame, and is configured to elastically support the movable frame in the fixing frame and elastically deform when the movable portion rotates.

An image capturing module includes the image stabilization module, a lens module and an image sensor, and the movable frame is configured to receive the lens module and the image sensor. The optical axis of the lens module is aligned with the image sensing module.

An electronic device includes the above-described image capturing module.

The image stabilization module and the image capturing module and the electronic device provided with the image stabilization module are driven by a movable frame which is rotatably mounted for receiving the lens module and the image sensor. The component drives the movable frame to rotate relative to the fixed frame to compensate for the shaking of the image capturing module, thereby avoiding image blur caused by the image capturing module and the electronic device when shooting.

The invention will now be described in further detail with reference to the accompanying drawings.

Referring to FIG. 1 to FIG. 2 , an image stabilization module 10 according to a first embodiment of the present invention includes a mounting frame 100 , a movable frame 200 , a driving unit 300 , and an elastic component 400 .

The holder 100 is fixed in an electronic device such as a digital camera (not shown). The holder 100 is substantially a rectangular body frame including a first side wall 111, a second side wall 112, a third side wall 113, and a fourth side wall 114. The first side wall 111 , the second side wall 112 , the third side wall 113 , and the fourth side wall 114 enclose the first receiving space 115 . The first sidewall 111 is opposite to the third sidewall 113 , and the second sidewall 112 is opposite to the fourth sidewall 114 .

The first sidewall 111 has a first receiving hole 111a. The second side wall 112 has a second receiving hole 112a. The third side wall 113 has a third receiving hole 113a. The fourth side wall 114 has a fourth receiving hole 114a.

The lower side of the first side wall 111 has a positioning groove 121a and a positioning post 121b located in the positioning groove 121a. The height of the positioning post 121b is equivalent to the depth of the positioning groove 121a. The positioning post 121b is located substantially at an intermediate position of the lower side. The lower side of the third side wall 113 has a positioning groove 123a and a positioning post 123b which are identical in structure to the positioning groove 121a of the first side wall 111 and the positioning post 121b. The positioning groove 121a of the first side wall 111 and the positioning groove 123a of the third side wall 113 are symmetrically distributed with respect to the center of the midpoint of the line connecting the positioning post 121b of the first side wall 111 and the positioning post 123b of the third side wall 113. Therefore, the line connecting the positioning post 121b of the first side wall 111 and the positioning post 123b of the third side wall 113 is the first straight line L1.

The upper side of the second side wall 112 has a positioning groove 122a and a positioning post 122b located in the positioning groove 122a. The height of the positioning post 122b is equivalent to the depth of the positioning groove 122a. The positioning post 122b is located substantially at an intermediate position of the upper side. The upper side of the fourth side wall 114 has a positioning groove 124a and a positioning post 124b which are identical in structure to the positioning groove 122a of the second side wall 112 and the positioning post 122b. The positioning groove 122a of the second side wall 112 and the positioning groove 124a of the fourth side wall 114 are symmetrically distributed with respect to the center of the midpoint of the line connecting the positioning post 122b of the second side wall 112 and the positioning post 124b of the fourth side wall 114. Therefore, the line connecting the positioning post 122b of the second side wall 112 and the positioning post 124b of the fourth side wall 114 is a second straight line L2. In this embodiment, the first straight line L1 and the second straight line L2 are spatially perpendicular to each other; And defining a vertical line connecting the vertical line segment of the first straight line L1 and the second straight line L2 is a central axis of the fixed frame: a Z axis, a midpoint of the vertical line segment is a circle point O, and an axis parallel to the first straight line L1 is The X axis, the axis parallel to the second line L2, is the Y axis, as shown in FIG.

The movable frame 200 has a substantially hollow rectangular shape and has the same central axis Z-axis as the fixed frame 100. The movable frame 200 is received in the first receiving space 115 of the fixing frame 100. The movable frame 200 includes four first outer side surfaces 211, a second outer side surface 212, a third outer side surface 213, a fourth outer side surface 214, and the four outer side surfaces 211, 212, 213 and Upper surface 215 and lower surface 216 of 214. The upper surface 215 is disposed opposite the lower surface 216. The four outer side surfaces 211, 212, 213, and 214, the upper surface 215 and the lower surface 216 define a second receiving space 217, and the upper surface 215 defines a light receiving hole 215a communicating with the second receiving space 217. The four outer sides 211, 212, 213 and 214 of the movable frame 200 are respectively spaced apart from the four side walls 111, 112, 113 and 114 of the fixed frame 100 by four distances, and the four distances may all be equal, all unequal or partial. Equal, depending on the range of compensation jitter of the image stabilization module 10.

The driving unit 300 includes a first magnetic element 311 fixed to the fixing frame 100 and a second magnetic element 312 fixed to the movable frame 200. The first magnetic element 311 is disposed opposite to the second magnetic element 312. The driving unit 300 generates a driving force by the first magnetic element 311 and the second magnetic element 312 to drive the movable frame 200 to rotate about the X axis and the Y axis respectively with respect to the fixing frame 100, and the X axis is perpendicular to the Y axis. .

Specifically, in the present embodiment, the first magnetic element 311 includes four coils 311a, 311b, 311c, and 311d. The four coils 311a, 311b, 311c, and 311d are each substantially rectangular in shape and are respectively received and fixed in the four receiving holes 111a, 112a, 113a, and 114a. The coil 311a accommodated in the first receiving hole 111a and the coil 311c accommodated in the third receiving hole 113a have the same current direction as in the direction of the arrow shown in the coil of FIG. The coil 311b accommodated in the second receiving hole 112a and the coil 311d accommodated in the fourth receiving hole 114a have the same current direction, as in the direction of the arrow shown in the coil of FIG.

The second magnetic element 312 includes four magnet groups 312a, 312b, 312c and 312d, which are a first magnet group 312a, a second magnet group 312b, a third magnet group 312c and a fourth magnet group 312d. Each magnet group is fixed to each of the outer side faces of the movable frame 200 and opposes each of the coils to interact with each of the coils to generate a driving force. Each magnet group includes two permanent magnets (hereinafter referred to as upper permanent magnets, and lower permanent magnets). The first magnet group 312a is fixed on the first outer surface 211 and is disposed opposite to the coil 311a received in the first receiving hole 111a. The upper permanent magnet 612a of the first magnet group 312a is adjacent to the coil 311a received in the first receiving hole 111a. The first magnetic pole 620a is opposite to the second permanent magnet 614a of the first magnet group 312a, which is opposite to the second magnetic pole 622a of the coil 311a. In this embodiment, the first magnetic pole of the upper permanent magnet of each magnet group is N pole, and the second magnetic pole of the lower permanent magnet is S pole, as shown in FIG. 2 .

The elastic member 400 includes a upper elastic piece 411 and a lower elastic piece 412. The upper elastic piece 411 has a substantially flat shape and includes a movable portion 411a, a fixed portion 411b, and a bent portion 411c that connects the movable portion 411a and the fixed portion 411b.

The movable portion 411a has a shape substantially the same as the upper surface 215 of the movable frame 200, that is, a rectangular shape, and the movable portion 411a is provided with a through hole 421 aligned with the light entrance hole 215a of the upper surface 215, the through hole 421 The aperture is slightly larger than the aperture of the light entrance aperture 215a so as not to block light entering the aperture 215a. The movable portion 411a is fixed to the upper surface 215 of the movable frame 200 and moves in accordance with the movement of the movable frame 200.

In this embodiment, the bending portion 411c is two bending arms 411c, the fixing portion 411b is two fixing pieces 411b, and the two bending arms 411c and the two fixing pieces 411b are opposite sides of the movable portion 411a. The two bending arms 411c are symmetrically distributed outwardly with respect to the X-axis, and the two fixing pieces 411b are symmetrically distributed with respect to the X-axis, thereby obtaining better rotational stability and symmetry of the movable frame 200. Each of the bending arms 411c has two bends so that the bending arms 411c can be uniformly deformed under force and generate a uniform restoring force. Each of the bending arms 411c is located above the space between the movable frame 200 and the fixed frame 100, which provides a deformation space for the bending arms 411c.

Each of the fixing pieces 411b has a positioning hole 411d. The two fixing pieces 411b are fixed to the positioning post 122b of the second side wall 112 and the positioning post 124b of the fourth side wall 114 by the two positioning holes 411d. Two sidewalls 112 and a fourth sidewall 114 are disposed.

The lower elastic piece 412 has the same structure as the upper elastic piece 411. The movable portion 412a of the lower elastic piece 412 is fixed to the lower surface 216 of the movable frame 200. The two fixing pieces 412b of the lower elastic piece 412 are fixed on the first side wall 111 and the third side wall 113 by the two positioning holes 412d and the positioning post 121b of the first side wall 111 and the positioning post 123b of the third side wall 113, respectively. . Therefore, the movable frame 200 is elastically supported by the upper elastic piece 411 and the lower elastic piece 412 of the elastic member 400 in the fixing frame 100. The two bending arms 412c of the lower elastic piece 412 are symmetrically distributed about the Y axis, and the two fixing pieces 412b are symmetrically distributed about the Y axis, thereby obtaining better rotational stability and symmetry of the movable frame 200.

Referring to FIG. 3 (in FIG. 3, the dot shown in the coil indicates that the current direction is directed to the inside of the paper, and the cross shown in the coil indicates that the current direction is directed to the outside of the paper). In operation, it is assumed to be accommodated in the first receiving hole 111a. The coil 311a and the coil 311c accommodated in the third receiving hole 113a pass a current in a direction indicated by an arrow in FIG. 2, and are accommodated in the first principle according to the right-hand rule and the principle that the same magnetic field repels each other and the reverse magnetic field attracts each other. The upper long side 320a of the coil 311a in the receiving hole 111a exerts an attractive force on the upper permanent magnet 612a on the first outer side surface 211, and the lower long side 322a of the coil 311a faces the lower permanent magnet 614a on the first outer side surface 211. Produces repulsive force. Similarly, the upper long side 320c of the coil 311c received in the third receiving hole 113a generates a repulsive force to the upper permanent magnet 612c on the third outer side surface 213, and the lower long side 322c of the coil 311c faces the third outer side The lower permanent magnet 614c on 213 generates an attractive force. Therefore, the movable frame 200 receives a torsion force in a clockwise direction around the Y-axis, so that the movable frame 200 rotates clockwise around the Y-axis under the action of the torsion force, and at the same time, the bent portion 411c of the upper elastic piece 411 is The movable portion 411a is deformed in accordance with the rotation of the movable frame 200 to generate a restoring force. When the currents in the coils 311a and 311c disappear, the magnetic fields generated by the coils 311a and 311c also disappear, and the forces acting on the magnet groups 312a and 312c by the coils 311a and 311c also disappear. The movable portion 411a drives the movable frame 200 to rotate in the counterclockwise direction about the Y axis to the initial position by the restoring force of the bent portion 411c.

Similarly, it is assumed that the coil 311b accommodated in the second receiving hole 112a and the coil 311d accommodated in the fourth receiving hole 114a pass a current in a direction indicated by an arrow in FIG. 2, and the movable frame 200 is subjected to an X-axis. The torque of the movable frame 200 is rotated about the X axis by the torque. When the currents in the coils 311b and 311d disappear, the movable portion 412a of the lower elastic piece 412 causes the movable frame 200 to rotate in the reverse direction of the X-axis to the initial position due to the restoring force of the bent portion 412c. Since both the upper elastic piece 411 and the lower elastic piece 412 have appropriate elasticity, when the movable portion 200 is rotated about the X axis or the Y axis, the upper elastic piece 411 and the lower elastic piece 412 are not excessively restricted from each other.

It can be understood that in other embodiments, the first magnetic pole 620a can be an S pole, the second magnetic pole 622a can be an N pole, and the current directions through the coils 311a, 311b, 311c, and 311d can be changed accordingly.

Referring to FIG. 4 , an image capturing module 20 according to a second embodiment of the present invention includes an image stabilization module 10 , a lens module 12 , an image sensor 14 , and a circuit board 16 .

The lens module 12 , the image sensor 14 , and the circuit board 16 are respectively received in the second receiving space 217 of the movable frame 200 . The optical axis of the lens module 12 is aligned with the image sensor 14 . The sensor 14 is placed on the circuit board 16 and electrically connected to the circuit board 16. The optical axis of the lens module 12 is aligned with the center of the light entrance hole 215a of the upper surface 215 of the movable frame 200. When the image capturing module 20 is shaken, the movable frame 200 of the image stabilization module 10 can drive the lens module 12 and the image sensor 14 to perform shake compensation.

Preferably, the lens module 12 can adopt an autofocus lens module, such as the lens 12a disposed in the movable barrel of the voice coil motor actuator.

The image stabilization module provided by the present invention and the image capturing module having the image stabilization module are driven by the driving component by providing a movable frame which is rotatable and used for accommodating the lens module and the image sensor. The rotation of the frame compensates for the jitter of the image capturing module, thereby avoiding the image blur caused by the vibration of the image capturing module during shooting.

The image capturing module 20 can also be used in an electronic device such as a mobile phone, a digital camera, and a digital video camera. The electronic device further includes a sensing device for sensing the jitter of the lens module 12 in two mutually perpendicular directions. Such as gyroscope sensors and control units. The control unit controls the currents of the coils 311a, 311b, 311c, and 311d to control the motion of the lens module 12 and compensate for the jitter according to the jitter of the lens module 12 sensed by the sensing device. The sensing device can be attached to the lower surface 216 of the movable frame 200.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by those skilled in the art in light of the spirit of the invention, such as the shape of the holder 100 and the movable frame 200, may be other shapes such as cylindrical or other polygonal shapes; The shape of the holder and the movable frame are determined; and the first magnetic member 311 includes a magnet group, and the second magnetic member 312 includes a coil or the like, which are all covered by the following patent application.

10‧‧‧Image Stabilization Module

100‧‧‧ fixed frame

200‧‧‧ movable frame

300‧‧‧ drive unit

400‧‧‧Flexible components

111‧‧‧First side wall

112‧‧‧ second side wall

113‧‧‧ third side wall

114‧‧‧fourth sidewall

115‧‧‧First containment space

111a‧‧‧First receiving hole

112a‧‧‧Second receiving hole

113a‧‧‧ third receiving hole

114a‧‧‧4th receiving hole

121a, 122a, 123a, 124a‧‧‧ positioning slots

121b, 122b, 123b, 124b‧‧‧ positioning column

211‧‧‧ first outer side

212‧‧‧Second outer side

213‧‧‧ third outer side

214‧‧‧fourth outer side

215‧‧‧ upper surface

216‧‧‧ lower surface

217‧‧‧Second containment space

215a‧‧‧ light hole

311‧‧‧First magnetic component

312‧‧‧Second magnetic component

311a, 311b, 311c, 311d‧‧‧ coil

312a‧‧‧First magnet group

312c‧‧‧third magnet group

312b‧‧‧Second magnet set

620a‧‧‧First magnetic pole

312d‧‧‧4th magnet group

614a‧‧‧Next permanent magnet

612a‧‧‧Upper permanent magnet

411‧‧‧Upper film

622a‧‧‧second magnetic pole

411a, 412a‧‧‧ movable part

412‧‧‧Shear

411c, 412c‧‧‧ bend

411b, 412b‧‧‧ fixed department

411d, 412d‧‧‧ positioning holes

421‧‧‧through hole

12‧‧‧Lens module

20‧‧‧Image capture module

16‧‧‧ boards

14‧‧‧Image sensor

12a‧‧‧Lens

FIG. 1 is a perspective view of an image stabilization module according to a first embodiment of the present invention.

2 is an exploded perspective view of the image stabilization module of FIG. 1.

FIG. 3 is a schematic diagram of the operation of the image stabilization module of FIG. 1.

4 is a cross-sectional view of an image taking module according to a second embodiment of the present invention.

200‧‧‧ movable frame

100‧‧‧ fixed frame

400‧‧‧Flexible components

111‧‧‧First side wall

112‧‧‧ second side wall

113‧‧‧ third side wall

114‧‧‧fourth sidewall

115‧‧‧First containment space

111a‧‧‧First receiving hole

112a‧‧‧Second receiving hole

113a‧‧‧ third receiving hole

114a‧‧‧4th receiving hole

213‧‧‧ third outer side

211‧‧‧ first outer side

121a, 122a, 123a, 124a‧‧‧ positioning slots

121b, 122b, 123b, 124b‧‧‧ positioning column

215‧‧‧ upper surface

212‧‧‧Second outer side

217‧‧‧Second containment space

214‧‧‧fourth outer side

311‧‧‧First magnetic component

216‧‧‧ lower surface

312a‧‧‧First magnet group

215a‧‧‧ light hole

312b‧‧‧Second magnet set

312‧‧‧Second magnetic component

311a, 311b, 311c, 311d‧‧‧ coil

312d‧‧‧4th magnet group

312c‧‧‧third magnet group

612a‧‧‧Upper permanent magnet

620a‧‧‧First magnetic pole

622a‧‧‧second magnetic pole

614a‧‧‧Next permanent magnet

412‧‧‧Shear

411‧‧‧Upper film

411b, 412b‧‧‧ fixed department

411a, 412a‧‧‧ movable part

421‧‧‧through hole

411c, 412c‧‧‧ bend

411d, 412d‧‧‧ positioning holes

Claims (8)

An image stabilization module includes:
a fixed frame having a central axis;
a movable frame located in the fixing frame and spaced apart from the fixing frame, having the same central axis as the fixing frame;
The driving unit includes a first magnetic component disposed on the mounting frame and a second magnetic component disposed on the movable frame, the first magnetic component being disposed opposite to the second magnetic component, wherein the driving component is configured by the first magnetic component And the second magnetic element generates a driving force to drive the movable frame to rotate relative to the fixed frame about the first axis and the second axis, the first axis is perpendicular to the second axis, and the first axis and the first The two axes are perpendicular to the central axis; and an elastic member elastically coupled between the fixed frame and the movable frame for elastically supporting the movable frame in the fixed frame and elastically deforming when the movable portion rotates. The image stabilization module of claim 1, wherein the fixing frame comprises four side walls, each of the side walls has a receiving hole, and the first magnetic component is disposed in the four receiving holes. The image stabilization module of claim 2, wherein the movable frame comprises four outer sides, each of the outer sides corresponding to each of the side walls, and the second magnetic group is disposed at the four outer sides. On the side. The image stabilization module of claim 3, wherein the first magnetic component comprises four coils, each of the coils being disposed in the receiving hole. The image stabilization module of claim 3, wherein the second magnetic component comprises four magnet groups, each magnet group being fixed on each of the outer sides and opposite to each of the coils, each The magnet group includes two permanent magnets, and the two permanent magnets are opposite to the magnetic poles of the coil. The image stabilization module of claim 1, wherein the elastic element comprises two elastic pieces, each of the elastic pieces comprising a movable portion, a fixing portion and a bending portion connecting the movable portion and the fixing portion, The movable portion is fixed to the movable frame, and the fixed portion is fixed to the fixed frame. An image capturing module, comprising: an image stabilization module, a lens module and an image sensor according to any one of claims 1-6, wherein the movable portion is configured to receive the lens module and the image sense The optical axis of the lens module is aligned with the image sensor. An electronic device comprising the image taking module as described in claim 7 of the patent application.