US20140327965A1 - Tri-Axis Close Loop Feedback Controlling Module for Electromagnetic Lens Driving Device - Google Patents
Tri-Axis Close Loop Feedback Controlling Module for Electromagnetic Lens Driving Device Download PDFInfo
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- US20140327965A1 US20140327965A1 US14/268,205 US201414268205A US2014327965A1 US 20140327965 A1 US20140327965 A1 US 20140327965A1 US 201414268205 A US201414268205 A US 201414268205A US 2014327965 A1 US2014327965 A1 US 2014327965A1
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- electromagnetic
- coupled
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- driving
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
- G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/08—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted to co-operate with a remote control mechanism
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
- H02K41/02—Linear motors; Sectional motors
- H02K41/035—DC motors; Unipolar motors
- H02K41/0352—Unipolar motors
- H02K41/0354—Lorentz force motors, e.g. voice coil motors
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/68—Control of cameras or camera modules for stable pick-up of the scene, e.g. compensating for camera body vibrations
- H04N23/682—Vibration or motion blur correction
- H04N23/685—Vibration or motion blur correction performed by mechanical compensation
- H04N23/687—Vibration or motion blur correction performed by mechanical compensation by shifting the lens or sensor position
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2205/00—Adjustment of optical system relative to image or object surface other than for focusing
- G03B2205/0007—Movement of one or more optical elements for control of motion blur
- G03B2205/0015—Movement of one or more optical elements for control of motion blur by displacing one or more optical elements normal to the optical axis
Definitions
- the invention refers to a tri-axis close-loop feedback controlling module for electromagnetic lens driving device, which employs a 6-pin Hall element to allow the electromagnetic lens driving device to control the focusing operations of the auto-focus module along the Z-axis based on a control signal generated according to the X-and-Y axial positions of the auto-focus module, so as to achieve the functions of tri-axis close-loop feedback control.
- VCM voice coil motor
- an optical system composed of an optic lens module, such as a camera system or a video recorder system
- hand shake or some external situations usually occur to alter optical path so as to degrade the imaging upon the image-compensation module and further to obscure the formation of the images.
- a conventional resort to resolve this problem is to introduce a further compensation mechanism for overcoming possible shaking during the imaging.
- Such a compensation mechanism can be either digital or optical.
- State of the art digital compensation mechanism is to analyze and process the digital imaging data capturing by the image-compensation module, so as to obtain a clearer digital image.
- Such a mechanism is also usually called as a digital image stabilization (DIS) mechanism.
- DIS digital image stabilization
- the optical compensation mechanism usually called as an optical image stabilization (OIS) mechanism, is to add a shake-compensation module upon the lens module or the image-compensation module.
- OIS optical image stabilization
- a feedback circuit is individually furnished for detecting and generating a feedback signal according to the position and movement of the lens along its optical path (usually also called as the Z-axis), and thus the auto-focus module can control and drive the lens to move along the Z-axis according to the feedback signal so as to conduct auto-focusing operations;
- another feedback circuit is individually furnished for detecting and generating another feedback signal according to the position and movement of the lens along a horizontal plane perpendicular to the optical path (usually also called as the X-Y axial plane), and thus the OIS module can control and drive the lens to move along the X-Y axes according to said another feedback signal so as to conduct OIS operations.
- the auto-focus module cannot receive any feedback signals from the OIS module when performing the Z-axial auto-focusing operations.
- the OIS module when the OIS module is performing the OIS operations in order to compensate the biased position of the lens caused by shakings, the OIS module will move the X and Y axial positions of the lens, and thus the precise focusing position (Z-axial position) of the lens will also be changed accordingly.
- the auto-focus module is also required to perform and adjust its auto-focusing operations continuously.
- a tri-axis close-loop feedback controlling module for electromagnetic lens driving device which comprises a 6-pin Hall element.
- Two pins of the 6-pin Hall element are coupled to the auto-focus module for providing a current to the auto-focus module in order to drive the auto-focus module to conduct the auto-focusing operations along the X-axis; while other four pins thereof are coupled to a control unit.
- the control unit can detect the signals generated by the OIS module to obtain the X-Y axial positions of the auto-focus module relative to the OIS module, so as to generate a control signal according to the X-Y axial position of the auto-focus module, and then send the control signal to the 6-pin Hall element.
- the 6-pin Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from the control unit and then providing the current for driving the auto-focus module based on the control signal from the control unit, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.
- Another object of the present invention is to provide a tri-axis close-loop feedback controlling module for electromagnetic lens driving device, which comprises a novel electric coupling structure to couple the six pins of the 6-pin Hall element with the circuitries of both the auto-focus module and the OIS module that are movable relative to each other, such that the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device can be achieved.
- a tri-axis close-loop feedback controlling module for electromagnetic lens driving device which comprises:
- a lens holder for holding a lens
- a movable frame for receiving the lens holder in such a manner that the lens holder is movable relative to the movable frame along a Z-axis direction;
- an electromagnetic driving, module furnished between the movable frame and the lens holder for driving the lens holder to move within the movable frame along the Z-axis direction;
- an optical image stabilization (OIS) module for driving the movable frame together with the lens holder to perform bi-directional movements along a X-axis direction and a Y-axis direction; wherein the X-axis, Y-axis and Z-axis are perpendicular to each other;
- OIS optical image stabilization
- control unit coupled to the OIS module; the control unit being able to detect and control operations of OIS module so as to generate a control signal according to the operations of the OIS module;
- a Hall element having at least six pins; wherein, two of the at least six pins are coupled with the electromagnetic driving module for supplying a current to the electromagnetic driving module in order to control operations of the electromagnetic driving module; other four of the at least six pins are coupled with the control unit for receiving the control signal from the control unit in order to control the current supplied to the electromagnetic driving, module based on the control signal, so as to achieve the function of tri-axis close-loop feedback controlling, the electromagnetic driving module.
- the tri-axis close-loop feedback controlling module for electromagnetic lens driving device further comprises:
- control unit being furnished on the first circuit board and coupled with the OIS module;
- the Hall element being coupled with the electromagnetic driving module and the control unit be means of the electric coupling structure
- the electric coupling structure comprises a first spring plate located at one side of the lens holder along the Z-axis direction; the first spring plate comprises at least four independent and separated first spring members; each one of these first spring members comprises a first inner rim for flexibly retaining a top position of the lens holder along the Z-axis direction and a first contact which is connected with one suspension wire; each one of the suspension wires extends from the first spring members toward the first circuit board and couples to the control unit; the Hall element is coupled with the four first spring members and the electromagnetic driving module, and can receive a control signal from the control unit in order to control and adjust a current provided by the Hall element to the electromagnetic driving module;
- each one of the first spring members of first spring plate comprises: a first outer rim connected to the movable frame, a first inner rim connected to the lens holder, at least one first inner string extending and connecting between the first outer rim and the first inner rim, and a first contact located at the first outer rim; each one of the suspension wires has its one end thereof being correspondingly connected to one of the first contacts;
- the electromagnetic lens driving device further comprises a second circuit board; the Hall element is furnished on the second circuit board; a sensing magnet for Z-axis position is furnished on the lens holder at a location corresponding to the Hall element; in addition, the end of each suspension wire which is connected to the first contact is coupled with the second circuit board, and thus is further coupled to one of the pins of the Hall element via the second circuit board.
- the electric coupling structure further comprises a second spring plate located at a lower side of the lens holder along the Z-axis direction opposite to the first spring plate; the second spring plate comprises at least two individual and separated second spring member; each one of the second spring members comprises: a second outer rim connected to the movable frame, a second inner rim fixed on the lens holder for flexibly retaining a bottom position of the lens holder along the Z-axis direction, at least one second inner string extending and connecting between the second outer rim and the second inner rim, and a second contact located at the second outer rim; wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil; wherein the second inner rim of each second spring member is electric coupled with the driving coil of the electromagnetic driving module; in addition, the second contact of each second spring member is coupled to the second circuit board and thus is further coupled with one of the pins of the Hall element.
- the electromagnetic driving module comprises at
- the second contact of each one of the second spring members is coupled to the second circuit board by means of one of the following structures: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let an end of the extending part connect to the second circuit board, and soldering a connecting wire at the second contact and let an end of the connecting wire connect to the second circuit board.
- the first spring plate includes at least six independent and separated first spring members; wherein, among these six first spring members, there are four first spring members that each of these four first spring members includes the first contact which is coupled with the control unit by means of the suspension wire; while the other two first spring members do not connect to the suspension wires and are coupled to the electromagnetic driving module via the first inner rim:
- the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil;
- first inner rim of each one of the other two first spring members is coupled with the coil of the electromagnetic driving module; in addition, the first outer rim of each one of the other two first spring members is coupled to the second circuit board and is further coupled to one of the pins of the Hall element in order to supply the current to the electromagnetic driving module in order to control operations of the electromagnetic driving module.
- the OIS module comprises:
- At least a first stabilizing magnet mounted on the movable frame and corresponding to the first stabilizing coil
- At least a second stabilizing magnet mounted on the movable frame and corresponding to the second stabilizing coil
- At least two position sensors mounted on the first circuit board and coupled to the control unit; the at least two position sensors being used to detect the position of the movable frame relative to the first circuit board along the X-axis direction and the Y-axis direction;
- first and second stabilizing magnets are the same with the driving magnets of the electromagnetic driving module.
- FIG. 1 is a front-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention
- FIG. 2 is a rear-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention
- FIG. 3 is the front-side schematic exploded view of the electric coupling structure and the electromagnetic driving module of the electromagnetic lens driving device according to the first embodiment of the present invention
- FIG. 4 is the rear-side schematic exploded view of the electric coupling structure and the electromagnetic driving module of the electromagnetic lens driving device according to the first embodiment of the present invention
- FIG. 5 is a schematic view of the six pins of the 6-pin Hall element of the electromagnetic lens driving device of the present invention.
- FIG. 6 is the perspective assembled view of the detailed positions of the suspension wires of the electromagnetic lens driving device according to the present invention's first embodiment
- FIG. 7 is the partial cross-sectional view of the detailed positions of the suspension wires of the electromagnetic lens driving device according to the present invention's first embodiment
- FIG. 8 is the perspective assembled view of the detailed positions of the second spring plate of the electromagnetic lens driving, device according to the present invention's first embodiment
- FIG. 9 is the p partial cross-sectional view of the detailed positions of the second spring plate of the electromagnetic lens driving device according to the present invention's first embodiment
- FIG. 10 is a schematic view showing a connecting way of the second spring plate and the driving coil of the electromagnetic driving module of the electromagnetic lens driving device according to the present invention's first embodiment:
- FIGS. 11A and 11B are respectively a 45-degree cross-sectional view without cross-sectional lines and a 45-degree cross-sectional view with cross-sectional lines of the first embodiment of the electromagnetic lens driving device shown in FIG. 1 and FIG. 2 ;
- FIGS. 12A to 12C are respectively the schematic views of three different embodiments of the ways to electrically conduct the driving coil of the electromagnetic driving module of the electromagnetic lens driving device of the invention.
- FIG. 13A and FIG. 13B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12A ;
- FIG. 14A and FIG. 14B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12B ;
- FIG. 15A and FIG. 15B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12C ;
- FIG. 16 is a schematic exploded view of the first embodiment of the electromagnetic lens driving device shown in FIG. 1 , in which the first spring plate and the second spring plate are also exploded;
- FIG. 17 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a second embodiment of the present invention.
- FIG. 18 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a third embodiment of the present invention.
- FIG. 19 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a fourth embodiment of the present invention.
- the tri-axis close-loop feedback controlling module for electromagnetic lens driving device comprises a 6-pins Hall Magnetic Sensing Element (also referred as 6-pin Hall element hereinafter).
- 6-pin Hall element also referred as 6-pin Hall element hereinafter.
- Two pins of the 6-pin Hall element are coupled to an auto-focus module for providing a current to the auto-focus module in order to drive the auto-focus module to conduct the auto-focusing operations along the Z-axis; while other four pins of the 6-pin Hall element are coupled to a control unit.
- the control unit can detect the signals generated by an OIS module to obtain the X-Y axial positions of the auto-focus module relative to the OIS module, so as to generate a control signal according to the X-Y axial position of the auto-focus module, and then send the control signal to the 6-pin Hall element.
- the 6-pin Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from the control unit and then providing the current for driving the auto-focus module based on the control signal received from the control unit, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.
- FIGS. 1 and 2 are respectively a front-side schematic exploded view and a rear-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention.
- FIGS. 11A and 11B are respectively a 45-degree cross-sectional view without cross-sectional lines and a 45-degree cross-sectional view with cross-sectional lines of the first embodiment of the electromagnetic lens driving device shown in FIG. 1 and FIG. 2 .
- FIG. 16 is a schematic exploded view of the first embodiment of the electromagnetic lens driving device shown in FIG. 1 , in which the first spring plate and the second spring plate are also exploded.
- the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device 1 comprises: a lens holder 11 , a moveable frame 12 , an electromagnetic driving module 13 , an optical image stabilization (OIS) module 14 , a control unit 15 , a Hall element 16 having at least six pins (also referred as 6-pin Hall element), a first circuit board 17 , an electric coupling structure 18 , a second circuit board 19 , a casing 20 and a bottom cover 21 .
- OIS optical image stabilization
- the lens holder 11 is for receiving a lens (not shown in FIGS. 1 and 2 ) therein.
- the lens is screwed into the threads 111 formed on the inner surface of the central through hole of the lens holder 11 in a removable manner.
- the movable frame 12 is a hollow frame structure having an inner compartment for receiving the lens holder 11 in such a manner that, the lens holder 11 is movable a Z-axis direction relative to the movable frame 12 along in a limited manner.
- the electromagnetic driving module 13 is furnished between the movable frame 12 and the lens holder 11 and is for driving the lens holder 11 together with the lens to move along the Z-axis relative to the movable frame 12 , so as to perform the auto-focusing and/or zooming operations along the direction of Z-axis.
- the electromagnetic driving module 13 comprises at least a driving coil 131 and at least two driving magnets 132 , 133 .
- the driving coil 131 is furnished on the lens holder 11 by means of having the driving coil 131 winding around the outer rim of the lens holder 11 .
- the at least two driving magnets 132 , 133 comprises four magnets which are respectively mounted on four sides of the movable frame 12 corresponding to the driving coil 131 and are equally spaced apart from each other.
- the OIS module 14 is for driving the movable frame 12 together with the lens holder 11 located therein to move bi-directionally along an X-axis direction and a Y-axis direction, which usually is for moving the lens holder 11 together with the lens along the X-Y plane in order to compensate the biased position of the lens caused by shakings; that is, to perform OIS operations.
- the X-axis, Y-axis and Z-axis are perpendicular with each other, while the Z-axis is also the optical path for the lens.
- the OIS module 14 comprises: at least a first stabilizing coil 141 , at least a second stabilizing coil 142 , at least a first stabilizing magnet 132 , at least a second stabilizing magnet 133 , and at least two position sensors 143 .
- the first stabilizing coils 141 are furnished at two opposite sides of the first circuit board 17 and are coupled to the control unit 15 .
- the second stabilizing coils 142 are furnished at the other two opposite sides of the first circuit board 17 and are perpendicular to the first stabilizing coils 141 ; in addition, the second stabilizing coils 142 are coupled to the control unit 15 .
- the amount of both the first stabilizing coils 141 and the second stabilizing coils 142 is both three.
- the first stabilizing magnets 132 are mounted on the movable frame 12 and are corresponding to the first stabilizing coils 141 , respectively.
- the second stabilizing magnets 133 are mounted on the movable frame 12 and are corresponding to the second stabilizing coils 142 , respectively.
- the amount of both the first and second stabilizing magnets 132 , 133 is two.
- the first and second stabilizing magnets 132 , 133 are actually the same with the four driving magnets 132 , 133 of the electromagnetic driving module 13 : that means, the four magnets 132 , 133 not only are used as the driving magnets in the electromagnetic driving module 13 , but also are used as the stabilizing magnets in the OIS module 14 in the same time.
- these driving magnets and stabilizing magnets can also be different magnets mounted on the same movable frame.
- the two position sensors 143 are mounted on the first circuit board 17 and are coupled to the control unit. The locations of these two position sensors 143 are respectively corresponding to and also near to the first stabilizing magnet 132 and the second stabilizing magnet 133 . Such that, these two position sensors 143 can be used to detect the variations of the magnetic strength of the first stabilizing magnet 132 and the second stabilizing magnet 133 , respectively, so as to detect and calculate the position or biased position of the movable frame 12 relative to the first circuit board 17 along the X-axis direction and the Y-axis direction.
- the at least two position sensors 143 can also be Hall elements, but not necessarily be the 6-pin Hall element. These position sensors 143 can also be Hall elements with only four pins or other kinds of magnetic force detecting sensors.
- control unit 15 can receive the output signals of the two position sensors 143 and then calculate the position or biased position of the movable frame 12 (together with the lens holder 11 and lens located therein) relative to the first circuit board 17 along the X-axis direction and the Y-axis direction; and then, the control unit 15 not only can generate control signals and electric currents to those stabilizing coils 141 , 142 for driving the OIS module 14 to compensate the biased positions of the lens along the X-axis and Y-axis directions (that is, the OIS operations), but the control unit 15 also can generate a control signal based on the calculated position or biased position of the movable frame 12 relative to the first circuit board 17 along the X-axis direction and the Y-axis direction, and then send the control signal to the 6-pin Hall element 16 .
- the 6-pin Hall element 16 has six contact pins, in which, two pins are coupled to the electromagnetic driving module 13 for providing an electric current to the electromagnetic driving module 13 and also controlling the operations of the electromagnetic driving module 13 , while the other four pins are coupled to the control unit 15 for receiving the control signals generated by the control unit 15 .
- the 6-pin Hall element 16 can control the current providing to the electromagnetic driving module 13 according to the control signals generated by the control unit 15 .
- control unit 15 not only can control the OIS module 14 to conduct the bi-directional OIS operations along the X-and-Y axes, but also can detect and receive the control signals of the OIS module 14 in order to calculate the current X-and-Y axial position (or biased position) of the movable frame 12 relative to the OIS module 14 (or first circuit board 17 ), so as to generate a control signal based on the calculated position (or biased position) of the movable frame 12 relative to the first circuit board 17 along the X-axis direction and the Y-axis direction, and then send the control signal to the 6-pin Hall element 16 .
- the 6-pin Hall element 16 not only can provide its own feedback control function for the Z-axial positions of the lens holder 11 , but also can accept the control signal generated by the control unit 15 in order to obtain the current X-and-Y axial position (or biased position) of the movable frame 12 ; such that the 6-pin Hall element 16 can adjust the electric current providing to the electromagnetic driving module 13 according to the accepted control signal, so as to control the Z-axial auto-focusing operations of the electromagnetic driving module 13 of the auto-focus module.
- the 6-pin Hall element 16 can be the Hall element produced by Asahi. Kasei Microdevices Corp.
- Model No. AKM 7345 that can be purchased from the market, or can also be other kinds of Hall element with six pins available in the art, so as to provide to functions of acting as the position sensor along Z-axis direction and controlling and providing the driving current to the driving coils based on the control signal which in turn is corresponding to the X-and-Y axial positions of the movable frame.
- the movable frame 12 is a movable member that can move relative to the first circuit board 17 bi-directionally along the X-axis and the Y-axis, while the lens holder 11 together with the lens therein is another movable member that can move relative to the movable frame 12 along the Z-axis direction.
- FIG. 3 and FIG. 4 respectively are the front-side and rear-side schematic exploded views of the electric coupling structure 18 and the electromagnetic driving module 13 of the electromagnetic lens driving device according to the first embodiment of the present invention.
- the 6-pin Hall element 16 is coupled with the electromagnetic driving module 13 and the control unit 15 by means of the electric coupling structure 18 .
- the electric coupling structure 18 comprises a first spring plate 181 (also referred as the upper spring plate), a second spring plate 181 (also referred as the lower spring plate), and at least four suspension wires 183 .
- the first spring, plate 181 is located at an upper side of the lens holder 11 along the Z-axis direction, and comprises four individual and separated first spring member 1811 .
- Each one of the first spring members 1811 comprises a first inner rim 1812 for flexibly retaining a top position of the lens holder 11 along the Z-axis direction and a first contact 1813 which is connected with one suspension wire 183 .
- Each one of the suspension wires 183 extends from the first spring members 1811 toward the first circuit board 17 and couples to the control unit 15 .
- the 6-pin Hall element 16 is coupled with the four first spring members 1811 of the first spring plate 181 and the electromagnetic driving module 13 , and can receive a control signal from the control unit 15 in order to control and adjust the electric current provided by the 6-pin Hall element 16 to the electromagnetic driving module 13 . As shown in FIG. 3 and FIG.
- both the first spring plate 181 and the second spring plate 182 are in the form of hollowed out thin metal plate.
- each one of the first spring members 1811 of first spring plate 181 comprises: a first outer rim 1814 connected to the movable frame 12 , a first inner rim 1812 connected to the lens holder 11 , at least one first inner string 1815 extending and connecting between the first outer rim 1814 and the first inner rim 1812 , and a first contact 1813 located at the first outer rim 1814 .
- Each one of the suspension wires 183 has its one end thereof being correspondingly connected and soldered to one of the first contacts 1813 .
- the second spring plate 182 is located at a lower side of the lens holder 11 along the Z-axis direction opposite to the first spring plate 181 , and comprises at least two individual and separated second spring member 1821 .
- Each one of the second spring members 1821 comprises: a second outer rim 1822 connected to the movable frame 12 , a second inner rim 1823 for flexibly retaining a bottom position of the lens holder 11 along the Z-axis direction, at least one second inner string 1824 extending and connecting between the second outer rim 1822 and the second inner rim 1823 , and a second contact (not shown in FIGS. 3 and 4 ) located at the second outer rim 1822 .
- Each one of the suspension wires 183 has its one end thereof being correspondingly connected and soldered to one of the first contacts 1813 .
- each one of the second inner rims 1823 of the second spring members 1821 is coupled with the driving coil 131 of the electromagnetic driving module 13 , while the second contact of the second spring member 1821 is electrically coupled to the second circuit board 19 and then further coupled with one of the six pins of the 6-pin Hall element 16 .
- first connecting parts 1816 being formed between the first spring members 181 while a plurality of second connecting parts 1825 are further formed between the second spring members 182 ; however, the function and purpose of these first and second connecting parts 1816 , 1825 are merely for convenient production and assembly only.
- FIG. 5 is a schematic view of the six pins of the 6-pin Hall element of the electromagnetic lens driving device of the present invention.
- the 6-pin Hall element of Model No. AKM 7345 produced by Asahi Kasei Microdevices Corp.
- its six pins 161 can be numbered as A1, A2, B1, B2, C1 and C2, respectively, and the feature of each pin is shown in the following Table One.
- pin A1 is VDD (pin for input power) whose function is to input power supply of 2.65V ⁇ 3.6V (Volt) for driving the 6-pin Hall element 16 .
- Pin A2 is VSS whose function is ground.
- Pin B1 is SDA whose function is to input and output digital data signals.
- Pin B1 is SCL whose function is to input clock signals.
- Pins C1 and C2 are for outputting driving current of 79 mA-142 mA (120 mA preferred) to the driving coil 131 of electromagnetic driving module 13 in order to perform the auto-focusing and/or zooming operations.
- each one of the suspension wire 183 has its one end (upper end) connects to a corresponding first contact 1813 of the first spring member 1811 , and couples to the second circuit board 19 via the first spring, member 1811 , and thus further couples to one of the pins A1, A2, and B2 of the 6-pin Hall element 16 furnished on the second circuit board 19 .
- the second contact of each one of the second spring members 1821 is coupled to the second circuit board 19 by means of one of the following structure: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let the upper end of the extending part connect to the second circuit board 19 , or soldering a connecting wire at the second contact and let the upper end of the connecting wire connect to the second circuit board 19 .
- the second spring plate 182 comprises two independent and separated second spring members 1821 .
- Each one of the second spring members 1821 includes a thin elongated extending, part 1827 which is extended from the second contact 1826 and id bent toward the second circuit board 19 in such a manner that, the upper end of the extending part 1827 is contacted and soldered with the second circuit board 19 , and thus further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16 .
- FIG. 10 is a schematic view showing a connecting way of the second spring plate 182 and the driving coil 131 of the electromagnetic driving module 13 of the electromagnetic lens driving device 1 according to the present invention's first embodiment.
- the second spring plate 182 comprises two independent and separated second spring members 1821 .
- Each one of the second spring members 1821 includes a soldering point 1828 at its second inner rim 1823 .
- Each one of the two soldering point 1828 is soldered with an end of the wire 1311 of the driving coil 131 of the electromagnetic driving module 13 . That means, the second inner rim 1823 of each second spring member 1821 is electric coupled with the driving coil 131 of the electromagnetic driving module 13 by means of the wire 1311 soldered at its soldering point 1828 .
- each second spring member 1821 is coupled to the second circuit board 19 via the extending part 1827 , and thus is further coupled with one of the pins C1 and C2 of the 6-pin Hall element 16 .
- the analog current signals output from the pins C1 and C2 of the 6-pin Hall element 16 can be used to drive the driving coil 13 of the electromagnetic driving module 13 in order to let the lens holder 11 move relative to the movable frame 12 for performing the auto-focusing and/or zooming operations along the Z-axis direction.
- FIGS. 12A to 12C are respectively the schematic views of three different embodiments of the ways to electrically conduct the driving coil of the electromagnetic driving module of the electromagnetic lens driving device of the invention.
- FIG. 13A and FIG. 13B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12A .
- FIG. 14A and FIG. 14B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12B .
- FIG. 15A and FIG. 15B are respectively the top view and schematic perspective view of the embodiment shown in FIG. 12C .
- the second inner rim 1823 a of each of these two second spring member 1821 a is electric coupled with the driving coil 131 of the electromagnetic driving module 13 by means of the wire 1311 soldered at its soldering point 1828 a .
- the second contact 1826 a of each of these two second spring members 1821 a is coupled to the second circuit board 19 via an extending part 1827 a extending from the second contact 1826 a toward the second circuit board 19 , and thus is further coupled with one of the pins C1 and C2 of the 6-pin Hall element 16 .
- each one of these four first spring members 1811 a includes a first inner rim 1812 a for flexibly retaining a top position of the lens holder 11 along the Z-axis direction and a first contact 1813 a which is connected with one suspension wire 183 .
- Each one of the suspension wires 183 extends from the first spring members 1811 a toward the first circuit board 17 and couples to the control unit 15 .
- the first outer rim 1814 a of each one of these four first spring members 1811 a is coupled to the second circuit board 19 and then is further coupled to one of the pins A1, A2, B1 and B2 of the 6-pin. Hall element 16 respectively. Thereby, the four pins A1, A2.
- B1 and B2 of the 6-pin Hall element 16 are coupled to the control unit 15 by means of the four first spring members of the first spring plate and the four suspension wires, while the other two pins C1 and C2 of the 6-pin Hall element 16 are coupled to the driving coil 131 of the electromagnetic driving module 13 by means of the bent extending parts 1827 a and the second inner rims 1823 a of the two second spring members 1821 a and the second circuit board 19 .
- the control 15 can detect the signals of the OIS module 14 to obtain the X-and-Y axial positions of the movable frame 12 relative to the first circuit board 17 , and then generates a control signal according to the X-and-Y axial positions of the movable frame 12 , and then sends this control signal to the 6-pin. Hall element 16 . Therefore, the 6-pin Hall element 16 not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from the control unit 15 and then providing the current for driving the auto-focus module 13 based on the control signal received from the control unit 15 , so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic driving module 13 .
- the second spring plate 182 b also includes two or four independent and separated second spring members 1821 b .
- the second inner rim 1823 b of each one of two of the second spring members 1821 b is formed with a soldering point 828 b .
- Each soldering point 1828 b is soldered with one end of the wires 1311 of the driving coil 131 of the electromagnetic driving module 13 .
- the second contact 1826 b of each one of two of the second spring members 1821 b is soldered with a lower end of a connecting wire 184 .
- each connecting wire 184 is connected to the second circuit board 19 , and is further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16 . Since the electrical conduction method between the pins A1, A2, B1 and B2 of the 6-pin Hall element 16 and the control unit 15 is exactly the same as the embodiment previously illustrated in FIG. 12A , FIG. 13A and FIG. 13B , and thus will not be described in detailed here.
- the first inner rims 1812 c ′ of the two first spring members 1811 c ′ are coupled with two ends of the driving coil 131 of the electromagnetic driving module 13 , in the mean time, either the first contact or the first outer rim 1814 c of each one of the two first spring members 1811 c ′ is coupled to the second circuit board 19 and is further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16 , so as to provide a current to the electromagnetic driving module 13 for controlling its operations. Since the electrical conduction method between the pins A1, A2, B1 and B2 of the 6-pin Hall element 16 and the control unit 15 is exactly the same as the embodiment previously illustrated in FIG. 12A , FIG. 13A and FIG. 13B , and thus will not be described in detailed here.
- the top cover 22 is located between the casing 20 a and the second circuit board 19 a , and can clamp and fix the second circuit board 19 a and the first outer rim 1814 a of each first spring member 1811 a of the first spring plate 181 a to the protrusions 121 formed on the upper surface of the movable frame 12 a . In the mean time, the top cover 22 can also prevent the lens holder 11 a from dropping out of the movable frame 12 a when moving along the Z-axis direction.
- the extending part 1827 a is bent toward the second circuit board 19 such that the end of the extending part 1827 a can connect to the second circuit board 19 .
- the soldering points 1828 a are soldered with two ends of the wires of the driving coil 131 of the electromagnetic driving module 13 .
- the other two second spring members 1821 a ′ of the second spring plate 182 a do not have the extending parts nor the soldering points.
- the electric coupling structure 18 a of this second embodiment shown in FIG. 17 is corresponding to the embodiment shown in FIG. 12A .
- FIG. 13A and FIG. 13B are examples of the electric coupling structure 18 a of this second embodiment shown in FIG. 17 corresponding to the embodiment shown in FIG. 12A .
- FIG. 13A and FIG. 13B are corresponding to the embodiment shown in FIG.
- FIG. 18 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device 1 b according to a third embodiment of the present invention.
- the electromagnetic lens driving device 1 b comprises: a lens holder 11 b , a moveable frame 12 b , an electromagnetic driving module 13 b , an OIS module 14 b , a control unit 15 b , a 6-pin Hall element 16 , a first circuit board 17 b , an electric coupling structure 18 h a second circuit board 19 b , a casing 20 b , a bottom cover 21 b and a top cover 22 b .
- the lens holder lib, moveable frame 12 b , electromagnetic driving module 13 b , OIS module 14 b , control unit 15 b, 6-pin Hall element 16 , first circuit board 17 b , second circuit board 19 b , casing 20 b , bottom cover 21 b and top cover 22 b have similar structures and features of which previously illustrated in the second embodiment shown in FIG. 17 , and thus no detailed descriptions will be provided for these similar components.
- the differences between the electromagnetic lens driving device 1 b of this third embodiment and the second embodiment are described below.
- the second spring plate 182 b comprises four independent and separated second spring members 1821 b , 1821 b ′, however, two of the second spring members 1821 b are formed with the soldering points 1828 b on their second inner rims 1823 b , but there is no extending part being formed on the second spring members 1821 b .
- two connecting wires 184 are connected between the second outer rims 1822 b of the two second spring members 1821 b having the soldering points 1828 b and the second circuit board 19 .
- Each soldering point 1828 h is soldered with an end of the wires of the driving coil 131 of the electromagnetic driving module 13 b .
- the other two spring members 1821 b ′ do not have any connecting wire nor soldering point.
- the electric coupling structure 18 b of this third embodiment shown in FIG. 18 is corresponding to the embodiment shown in FIG. 12B , FIG. 14A and FIG. 14B .
- FIG. 19 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device 1 c according to a fourth embodiment of the present invention.
- the electromagnetic lens driving device 1 c comprises: a lens holder 11 c , a moveable frame 12 c , an electromagnetic driving module 13 c , an OIS module 14 c , a control unit 15 c , a 6-pin Hall element 16 , a first circuit board 17 c , an electric coupling structure 18 c a second circuit board 19 c , a casing 20 c , a bottom cover 21 c and a top cover 22 c .
- the lens holder 11 c , moveable frame 12 c , electromagnetic driving module 13 c , OIS module 14 c , control unit 15 c, 6-pin Hall element 16 , first circuit board 17 c , second circuit board 19 c , casing 20 c , bottom cover 21 c and top cover 22 c have similar structures and features of which previously illustrated in the second embodiment shown in FIG. 17 , and thus no detailed descriptions will be provided for these similar components.
- the differences between the electromagnetic lens driving device 1 c of this fourth embodiment and the second embodiment are described below.
- the electric coupling structure 18 c does not rely on the second spring plate 182 c to electric conduct the driving coil 131 of the electromagnetic driving module 13 c .
- the first spring plate 181 c includes at least six independent and separated first spring members 1811 c , 1811 c ′. Among these six first spring members 1811 c , 1811 c , there are four first spring members 1811 c that each of these four first spring members 1811 c includes the first contact 1813 c which is coupled with the control unit 15 by means of the suspension wire 183 .
- the tri-axis close-loop feedback controlling module for electromagnetic lens driving device of the invention utilizes a 6-pin Hall element in the second circuit board fixed to the movable frame (lens module).
- the movable frame is suspended above a substrate (first circuit board).
- the movable frame is furnished with a lens holder for holding a lens therein which is movable along the X-axis direction.
- the lens holder is flexibly suspended within an inner compartment of the movable frame by means of an upper spring plate and a lower spring plate fixed on two ends of the lens holder.
- the rim of the movable frame is mounted with at least one driving magnet.
- the outer rim of the lens holder is wound with a driving coil corresponding to the driving magnet.
- the functions of auto-focusing and/or zooming are achieved.
- two ends of the driving coil are coupled to the two pins (C1, C2) of the Hall element by means of the two upward bent conduct ends of the lower spring plate.
- the four suspension wires located at the four corners of the upper spring plate of a suspension mechanism to electrically connecting the other four pins with the substrate (first circuit board).
- the electromagnetic lens driving device can utilize the 6-pin Hall element to detect the X-and-Y axial positions of the movable frame relative to the substrate (first circuit board), and uses the control unit located on the substrate (first circuit board) to calculate, and then adjusts the biased auto-focusing and/or zooming point of the lens along the Z-axis direction by coupling the two pins (C1, C2) of the Hall element to the driving coil. Therefore, the goal of tri-axis close-loop feedback controlling for the auto-focusing module and the OIS module can be achieved.
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Abstract
The tri-axis close-loop feedback controlling module for electromagnetic lens driving device comprises a 6-pin Hall element. Two pins of the Hall element are coupled to an auto-focus module for providing a current to drive the auto-focus module to conduct auto-focusing operations along the Z-axis; while other four pins of the Hall element are coupled to a control unit. The control unit detects the X-Y axial positions of the auto-focus module relative to an OIS module and generates a control signal which is then sent to the Hall element. Therefore, the Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can drive the auto-focus module based on the control signal corresponding to the X-Y axial positions of the auto-focus module, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.
Description
- This is a non-provisional application of PPA Ser. No. 61/819,737 filed on 2013 May 6, whose disclosures are incorporated by this reference as though fully set forth herein.
- 1. Field of the Invention
- The invention refers to a tri-axis close-loop feedback controlling module for electromagnetic lens driving device, which employs a 6-pin Hall element to allow the electromagnetic lens driving device to control the focusing operations of the auto-focus module along the Z-axis based on a control signal generated according to the X-and-Y axial positions of the auto-focus module, so as to achieve the functions of tri-axis close-loop feedback control.
- 2. Description of the Prior Art
- Digital photography technology has been widely applied to most of the portable electronic devices such as the cellular phones. Various miniaturized techniques in the lens module are involved to make all these applications possible; in particular, the voice coil motor (VCM) technique. The VCM introduces a combination of coiled magnets and spring plates to drive a lens to move back and forth along a photo axis for image-capturing, so as to perform auto-zooming and/or auto-focusing of the lens module. Further, in this trend of demanding for devices capable of high-level photographing functions, photographic quality and various camera functions such as thousand pixels, anti-hand shake ability and so on are equipped to distinguish high-end camera from cost-down level. However, in an optical system composed of an optic lens module, such as a camera system or a video recorder system, hand shake or some external situations usually occur to alter optical path so as to degrade the imaging upon the image-compensation module and further to obscure the formation of the images. A conventional resort to resolve this problem is to introduce a further compensation mechanism for overcoming possible shaking during the imaging. Such a compensation mechanism can be either digital or optical. State of the art digital compensation mechanism is to analyze and process the digital imaging data capturing by the image-compensation module, so as to obtain a clearer digital image. Such a mechanism is also usually called as a digital image stabilization (DIS) mechanism. On the other hand, the optical compensation mechanism, usually called as an optical image stabilization (OIS) mechanism, is to add a shake-compensation module upon the lens module or the image-compensation module.
- However, conventional technologies usually employ two different and yet independent control circuitries for the feedback circuits of the auto-focus module and the OIS module in the same camera device. That means, one control circuitry is used for receiving feedback signals of the auto-focus module and also controlling the auto-focus module based on the feedback signals, while another control circuitry is used for controlling the OIS module based on the feedback signals of the OIS module. More particularly, in the conventional technologies, a feedback circuit is individually furnished for detecting and generating a feedback signal according to the position and movement of the lens along its optical path (usually also called as the Z-axis), and thus the auto-focus module can control and drive the lens to move along the Z-axis according to the feedback signal so as to conduct auto-focusing operations; in the other hand, another feedback circuit is individually furnished for detecting and generating another feedback signal according to the position and movement of the lens along a horizontal plane perpendicular to the optical path (usually also called as the X-Y axial plane), and thus the OIS module can control and drive the lens to move along the X-Y axes according to said another feedback signal so as to conduct OIS operations. In the conventional technologies, the auto-focus module cannot receive any feedback signals from the OIS module when performing the Z-axial auto-focusing operations. However, when the OIS module is performing the OIS operations in order to compensate the biased position of the lens caused by shakings, the OIS module will move the X and Y axial positions of the lens, and thus the precise focusing position (Z-axial position) of the lens will also be changed accordingly. Which means, when the OIS module is performing the OIS operations, the auto-focus module is also required to perform and adjust its auto-focusing operations continuously. Unfortunately, because conventional technologies use two different and independent control and feedback circuits for the auto-focus module and OIS module to detect and control the movements of lens in the Z-axis and X-Y axes respectively, thus the responding and interacting speeds of the auto-focus module is relatively slower and delayed, which will cause delayed focusing operations when shakings occur. In addition, because the entire lens module (including lens and auto-focus module) is movable horizontally relative to the OIS module, the circuitry design is very difficult for conventional technologies if someone try to integrate the feedback circuit of the auto-focus module with the feedback circuit of the OIS module into one single circuitry.
- Accordingly, it is the primary object of the present invention to provide a tri-axis close-loop feedback controlling module for electromagnetic lens driving device which comprises a 6-pin Hall element. Two pins of the 6-pin Hall element are coupled to the auto-focus module for providing a current to the auto-focus module in order to drive the auto-focus module to conduct the auto-focusing operations along the X-axis; while other four pins thereof are coupled to a control unit. The control unit can detect the signals generated by the OIS module to obtain the X-Y axial positions of the auto-focus module relative to the OIS module, so as to generate a control signal according to the X-Y axial position of the auto-focus module, and then send the control signal to the 6-pin Hall element. Therefore, the 6-pin Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from the control unit and then providing the current for driving the auto-focus module based on the control signal from the control unit, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.
- Another object of the present invention is to provide a tri-axis close-loop feedback controlling module for electromagnetic lens driving device, which comprises a novel electric coupling structure to couple the six pins of the 6-pin Hall element with the circuitries of both the auto-focus module and the OIS module that are movable relative to each other, such that the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device can be achieved.
- In order to achieve aforementioned objects, the present invention discloses a tri-axis close-loop feedback controlling module for electromagnetic lens driving device, which comprises:
- a lens holder for holding a lens;
- a movable frame for receiving the lens holder in such a manner that the lens holder is movable relative to the movable frame along a Z-axis direction;
- an electromagnetic driving, module, furnished between the movable frame and the lens holder for driving the lens holder to move within the movable frame along the Z-axis direction;
- an optical image stabilization (OIS) module for driving the movable frame together with the lens holder to perform bi-directional movements along a X-axis direction and a Y-axis direction; wherein the X-axis, Y-axis and Z-axis are perpendicular to each other;
- a control unit, coupled to the OIS module; the control unit being able to detect and control operations of OIS module so as to generate a control signal according to the operations of the OIS module; and
- a Hall element having at least six pins; wherein, two of the at least six pins are coupled with the electromagnetic driving module for supplying a current to the electromagnetic driving module in order to control operations of the electromagnetic driving module; other four of the at least six pins are coupled with the control unit for receiving the control signal from the control unit in order to control the current supplied to the electromagnetic driving, module based on the control signal, so as to achieve the function of tri-axis close-loop feedback controlling, the electromagnetic driving module.
- In a preferred embodiment, the tri-axis close-loop feedback controlling module for electromagnetic lens driving device further comprises:
- a first circuit board; the control unit being furnished on the first circuit board and coupled with the OIS module; and
- an electric coupling structure; the Hall element being coupled with the electromagnetic driving module and the control unit be means of the electric coupling structure;
- wherein, the electric coupling structure comprises a first spring plate located at one side of the lens holder along the Z-axis direction; the first spring plate comprises at least four independent and separated first spring members; each one of these first spring members comprises a first inner rim for flexibly retaining a top position of the lens holder along the Z-axis direction and a first contact which is connected with one suspension wire; each one of the suspension wires extends from the first spring members toward the first circuit board and couples to the control unit; the Hall element is coupled with the four first spring members and the electromagnetic driving module, and can receive a control signal from the control unit in order to control and adjust a current provided by the Hall element to the electromagnetic driving module;
- wherein the first spring plate is in the form of hollowed out thin metal plate; in addition, each one of the first spring members of first spring plate comprises: a first outer rim connected to the movable frame, a first inner rim connected to the lens holder, at least one first inner string extending and connecting between the first outer rim and the first inner rim, and a first contact located at the first outer rim; each one of the suspension wires has its one end thereof being correspondingly connected to one of the first contacts;
- wherein the electromagnetic lens driving device further comprises a second circuit board; the Hall element is furnished on the second circuit board; a sensing magnet for Z-axis position is furnished on the lens holder at a location corresponding to the Hall element; in addition, the end of each suspension wire which is connected to the first contact is coupled with the second circuit board, and thus is further coupled to one of the pins of the Hall element via the second circuit board.
- In a preferred embodiment, the electric coupling structure further comprises a second spring plate located at a lower side of the lens holder along the Z-axis direction opposite to the first spring plate; the second spring plate comprises at least two individual and separated second spring member; each one of the second spring members comprises: a second outer rim connected to the movable frame, a second inner rim fixed on the lens holder for flexibly retaining a bottom position of the lens holder along the Z-axis direction, at least one second inner string extending and connecting between the second outer rim and the second inner rim, and a second contact located at the second outer rim; wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil; wherein the second inner rim of each second spring member is electric coupled with the driving coil of the electromagnetic driving module; in addition, the second contact of each second spring member is coupled to the second circuit board and thus is further coupled with one of the pins of the Hall element.
- In a preferred embodiment, the second contact of each one of the second spring members is coupled to the second circuit board by means of one of the following structures: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let an end of the extending part connect to the second circuit board, and soldering a connecting wire at the second contact and let an end of the connecting wire connect to the second circuit board.
- In a preferred embodiment, the first spring plate includes at least six independent and separated first spring members; wherein, among these six first spring members, there are four first spring members that each of these four first spring members includes the first contact which is coupled with the control unit by means of the suspension wire; while the other two first spring members do not connect to the suspension wires and are coupled to the electromagnetic driving module via the first inner rim:
- wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil;
- wherein the first inner rim of each one of the other two first spring members is coupled with the coil of the electromagnetic driving module; in addition, the first outer rim of each one of the other two first spring members is coupled to the second circuit board and is further coupled to one of the pins of the Hall element in order to supply the current to the electromagnetic driving module in order to control operations of the electromagnetic driving module.
- In a preferred embodiment, the OIS module comprises:
- at least a first stabilizing coil furnished on the first circuit board and coupled to the control unit;
- at least a second stabilizing coil furnished on the first circuit board and are perpendicular to the first stabilizing coils; in addition, the second stabilizing coils being coupled to the control unit;
- at least a first stabilizing magnet mounted on the movable frame and corresponding to the first stabilizing coil;
- at least a second stabilizing magnet mounted on the movable frame and corresponding to the second stabilizing coil; and
- at least two position sensors mounted on the first circuit board and coupled to the control unit; the at least two position sensors being used to detect the position of the movable frame relative to the first circuit board along the X-axis direction and the Y-axis direction;
- wherein, the first and second stabilizing magnets are the same with the driving magnets of the electromagnetic driving module.
- All these objects are achieved by the suspension mechanism for an optical image anti-shake device described below.
- The present invention will now be specified with reference to its preferred embodiment illustrated in the drawings, in which:
-
FIG. 1 and is a front-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention; -
FIG. 2 is a rear-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention; -
FIG. 3 is the front-side schematic exploded view of the electric coupling structure and the electromagnetic driving module of the electromagnetic lens driving device according to the first embodiment of the present invention; -
FIG. 4 is the rear-side schematic exploded view of the electric coupling structure and the electromagnetic driving module of the electromagnetic lens driving device according to the first embodiment of the present invention; -
FIG. 5 is a schematic view of the six pins of the 6-pin Hall element of the electromagnetic lens driving device of the present invention; -
FIG. 6 is the perspective assembled view of the detailed positions of the suspension wires of the electromagnetic lens driving device according to the present invention's first embodiment; -
FIG. 7 is the partial cross-sectional view of the detailed positions of the suspension wires of the electromagnetic lens driving device according to the present invention's first embodiment; -
FIG. 8 is the perspective assembled view of the detailed positions of the second spring plate of the electromagnetic lens driving, device according to the present invention's first embodiment; -
FIG. 9 is the p partial cross-sectional view of the detailed positions of the second spring plate of the electromagnetic lens driving device according to the present invention's first embodiment; -
FIG. 10 is a schematic view showing a connecting way of the second spring plate and the driving coil of the electromagnetic driving module of the electromagnetic lens driving device according to the present invention's first embodiment: -
FIGS. 11A and 11B are respectively a 45-degree cross-sectional view without cross-sectional lines and a 45-degree cross-sectional view with cross-sectional lines of the first embodiment of the electromagnetic lens driving device shown inFIG. 1 andFIG. 2 ; -
FIGS. 12A to 12C are respectively the schematic views of three different embodiments of the ways to electrically conduct the driving coil of the electromagnetic driving module of the electromagnetic lens driving device of the invention; -
FIG. 13A andFIG. 13B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12A ; -
FIG. 14A andFIG. 14B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12B ; -
FIG. 15A andFIG. 15B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12C ; -
FIG. 16 is a schematic exploded view of the first embodiment of the electromagnetic lens driving device shown inFIG. 1 , in which the first spring plate and the second spring plate are also exploded; -
FIG. 17 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a second embodiment of the present invention; -
FIG. 18 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a third embodiment of the present invention; and -
FIG. 19 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a fourth embodiment of the present invention. - The tri-axis close-loop feedback controlling module for electromagnetic lens driving device according to the present invention comprises a 6-pins Hall Magnetic Sensing Element (also referred as 6-pin Hall element hereinafter). Two pins of the 6-pin Hall element are coupled to an auto-focus module for providing a current to the auto-focus module in order to drive the auto-focus module to conduct the auto-focusing operations along the Z-axis; while other four pins of the 6-pin Hall element are coupled to a control unit. The control unit can detect the signals generated by an OIS module to obtain the X-Y axial positions of the auto-focus module relative to the OIS module, so as to generate a control signal according to the X-Y axial position of the auto-focus module, and then send the control signal to the 6-pin Hall element. Therefore, the 6-pin Hall element not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from the control unit and then providing the current for driving the auto-focus module based on the control signal received from the control unit, so as to achieve the goal of tri-axis close-loop feedback controlling for the electromagnetic lens driving device.
- Please refer to
FIG. 1 FIG. 2 ,FIG. 11A ,FIG. 11B andFIG. 16 . In which,FIGS. 1 and 2 are respectively a front-side schematic exploded view and a rear-side schematic exploded view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a first embodiment of the present invention.FIGS. 11A and 11B are respectively a 45-degree cross-sectional view without cross-sectional lines and a 45-degree cross-sectional view with cross-sectional lines of the first embodiment of the electromagnetic lens driving device shown inFIG. 1 andFIG. 2 .FIG. 16 is a schematic exploded view of the first embodiment of the electromagnetic lens driving device shown inFIG. 1 , in which the first spring plate and the second spring plate are also exploded. - In the first embodiment of the present invention, the tri-axis close-loop feedback controlling module for the electromagnetic
lens driving device 1 comprises: alens holder 11, amoveable frame 12, anelectromagnetic driving module 13, an optical image stabilization (OIS)module 14, acontrol unit 15, aHall element 16 having at least six pins (also referred as 6-pin Hall element), afirst circuit board 17, anelectric coupling structure 18, asecond circuit board 19, acasing 20 and abottom cover 21. - The
lens holder 11 is for receiving a lens (not shown inFIGS. 1 and 2 ) therein. Generally speaking, the lens is screwed into thethreads 111 formed on the inner surface of the central through hole of thelens holder 11 in a removable manner. - The
movable frame 12 is a hollow frame structure having an inner compartment for receiving thelens holder 11 in such a manner that, thelens holder 11 is movable a Z-axis direction relative to themovable frame 12 along in a limited manner. - The
electromagnetic driving module 13 is furnished between themovable frame 12 and thelens holder 11 and is for driving thelens holder 11 together with the lens to move along the Z-axis relative to themovable frame 12, so as to perform the auto-focusing and/or zooming operations along the direction of Z-axis. In this first embodiment, theelectromagnetic driving module 13 comprises at least a drivingcoil 131 and at least two drivingmagnets - The driving
coil 131 is furnished on thelens holder 11 by means of having the drivingcoil 131 winding around the outer rim of thelens holder 11. The at least two drivingmagnets movable frame 12 corresponding to the drivingcoil 131 and are equally spaced apart from each other. Thereby, when applying a current to the drivingcoil 131 of theelectromagnetic driving module 13, a magnetic pushing force along the Z-axis direction will be generated among the drivingcoil 131 and these drivingmagnets lens holder 11 together with the lens thereinside will be moved by the force along the Z-axis linearly respective to themovable frame 12, so as to achieve the functions of auto-focusing and/or zoomming. - The
OIS module 14 is for driving themovable frame 12 together with thelens holder 11 located therein to move bi-directionally along an X-axis direction and a Y-axis direction, which usually is for moving thelens holder 11 together with the lens along the X-Y plane in order to compensate the biased position of the lens caused by shakings; that is, to perform OIS operations. Wherein, the X-axis, Y-axis and Z-axis are perpendicular with each other, while the Z-axis is also the optical path for the lens. In this first embodiment, theOIS module 14 comprises: at least a first stabilizingcoil 141, at least a second stabilizingcoil 142, at least a first stabilizingmagnet 132, at least a second stabilizingmagnet 133, and at least twoposition sensors 143. The first stabilizingcoils 141 are furnished at two opposite sides of thefirst circuit board 17 and are coupled to thecontrol unit 15. The second stabilizingcoils 142 are furnished at the other two opposite sides of thefirst circuit board 17 and are perpendicular to the first stabilizingcoils 141; in addition, the second stabilizingcoils 142 are coupled to thecontrol unit 15. In the present embodiment, the amount of both the first stabilizingcoils 141 and the second stabilizingcoils 142 is both three. The first stabilizingmagnets 132 are mounted on themovable frame 12 and are corresponding to the first stabilizingcoils 141, respectively. In the mean time, the second stabilizingmagnets 133 are mounted on themovable frame 12 and are corresponding to the second stabilizingcoils 142, respectively. In this first embodiment, the amount of both the first and second stabilizingmagnets magnets magnets magnets electromagnetic driving module 13, but also are used as the stabilizing magnets in theOIS module 14 in the same time. However, in another embodiment not shown in figures, these driving magnets and stabilizing magnets can also be different magnets mounted on the same movable frame. The twoposition sensors 143 are mounted on thefirst circuit board 17 and are coupled to the control unit. The locations of these twoposition sensors 143 are respectively corresponding to and also near to the first stabilizingmagnet 132 and the second stabilizingmagnet 133. Such that, these twoposition sensors 143 can be used to detect the variations of the magnetic strength of the first stabilizingmagnet 132 and the second stabilizingmagnet 133, respectively, so as to detect and calculate the position or biased position of themovable frame 12 relative to thefirst circuit board 17 along the X-axis direction and the Y-axis direction. In this embodiment, the at least twoposition sensors 143 can also be Hall elements, but not necessarily be the 6-pin Hall element. Theseposition sensors 143 can also be Hall elements with only four pins or other kinds of magnetic force detecting sensors. - The
control unit 15 is furnished on thefirst circuit board 17 and is coupled with the stabilizingcoils OIS module 14 and thoseposition sensors 143. Thecontrol unit 15 can detect and control the operations of theOIS module 14, and can generate a control signal corresponding to the OIS operations of theOIS module 14. In other words, thecontrol unit 15 can receive the output signals of the twoposition sensors 143 and then calculate the position or biased position of the movable frame 12 (together with thelens holder 11 and lens located therein) relative to thefirst circuit board 17 along the X-axis direction and the Y-axis direction; and then, thecontrol unit 15 not only can generate control signals and electric currents to those stabilizingcoils OIS module 14 to compensate the biased positions of the lens along the X-axis and Y-axis directions (that is, the OIS operations), but thecontrol unit 15 also can generate a control signal based on the calculated position or biased position of themovable frame 12 relative to thefirst circuit board 17 along the X-axis direction and the Y-axis direction, and then send the control signal to the 6-pin Hall element 16. - In the present invention, the 6-
pin Hall element 16 has six contact pins, in which, two pins are coupled to theelectromagnetic driving module 13 for providing an electric current to theelectromagnetic driving module 13 and also controlling the operations of theelectromagnetic driving module 13, while the other four pins are coupled to thecontrol unit 15 for receiving the control signals generated by thecontrol unit 15. Such that, the 6-pin Hall element 16 can control the current providing to theelectromagnetic driving module 13 according to the control signals generated by thecontrol unit 15. That means, thecontrol unit 15 not only can control theOIS module 14 to conduct the bi-directional OIS operations along the X-and-Y axes, but also can detect and receive the control signals of theOIS module 14 in order to calculate the current X-and-Y axial position (or biased position) of themovable frame 12 relative to the OIS module 14 (or first circuit board 17), so as to generate a control signal based on the calculated position (or biased position) of themovable frame 12 relative to thefirst circuit board 17 along the X-axis direction and the Y-axis direction, and then send the control signal to the 6-pin Hall element 16. Therefore, the 6-pin Hall element 16 not only can provide its own feedback control function for the Z-axial positions of thelens holder 11, but also can accept the control signal generated by thecontrol unit 15 in order to obtain the current X-and-Y axial position (or biased position) of themovable frame 12; such that the 6-pin Hall element 16 can adjust the electric current providing to theelectromagnetic driving module 13 according to the accepted control signal, so as to control the Z-axial auto-focusing operations of theelectromagnetic driving module 13 of the auto-focus module. As a result, the feature of X-Y-Z tri-axis close-loop feedback controlling for electromagneticlens driving device 1 is achieved. In the first embodiment, the 6-pin Hall element 16 can be the Hall element produced by Asahi. Kasei Microdevices Corp. with the Model No. AKM 7345 that can be purchased from the market, or can also be other kinds of Hall element with six pins available in the art, so as to provide to functions of acting as the position sensor along Z-axis direction and controlling and providing the driving current to the driving coils based on the control signal which in turn is corresponding to the X-and-Y axial positions of the movable frame. - In the first embodiment, the
first circuit board 17 is a flexible printed circuit (FPC) board. Thefirst circuit board 17 not only is furnished with thecontrol unit 15, the stabilizingcoils OIS module 14 and theposition sensors 143, but also has aflat cable 171 extending out of thecasing 20 of the electromagneticlens driving device 1 for connecting to a connecting cable or a connecting socket (not shown in figures). In the present invention, thefirst circuit board 17 is connected on thebottom cover 21 and is a fixed member as thecasing 20. To describe in a relative manner, themovable frame 12 is a movable member that can move relative to thefirst circuit board 17 bi-directionally along the X-axis and the Y-axis, while thelens holder 11 together with the lens therein is another movable member that can move relative to themovable frame 12 along the Z-axis direction. - Please refer to
FIG. 3 andFIG. 4 , which respectively are the front-side and rear-side schematic exploded views of theelectric coupling structure 18 and theelectromagnetic driving module 13 of the electromagnetic lens driving device according to the first embodiment of the present invention. In the present invention, the 6-pin Hall element 16 is coupled with theelectromagnetic driving module 13 and thecontrol unit 15 by means of theelectric coupling structure 18. In this first embodiment, theelectric coupling structure 18 comprises a first spring plate 181 (also referred as the upper spring plate), a second spring plate 181 (also referred as the lower spring plate), and at least foursuspension wires 183. The first spring,plate 181 is located at an upper side of thelens holder 11 along the Z-axis direction, and comprises four individual and separatedfirst spring member 1811. Each one of thefirst spring members 1811 comprises a firstinner rim 1812 for flexibly retaining a top position of thelens holder 11 along the Z-axis direction and afirst contact 1813 which is connected with onesuspension wire 183. Each one of thesuspension wires 183 extends from thefirst spring members 1811 toward thefirst circuit board 17 and couples to thecontrol unit 15. The 6-pin Hall element 16 is coupled with the fourfirst spring members 1811 of thefirst spring plate 181 and theelectromagnetic driving module 13, and can receive a control signal from thecontrol unit 15 in order to control and adjust the electric current provided by the 6-pin Hall element 16 to theelectromagnetic driving module 13. As shown inFIG. 3 andFIG. 4 , both thefirst spring plate 181 and thesecond spring plate 182 are in the form of hollowed out thin metal plate. Wherein, each one of thefirst spring members 1811 offirst spring plate 181 comprises: a firstouter rim 1814 connected to themovable frame 12, a firstinner rim 1812 connected to thelens holder 11, at least one firstinner string 1815 extending and connecting between the firstouter rim 1814 and the firstinner rim 1812, and afirst contact 1813 located at the firstouter rim 1814. Each one of thesuspension wires 183 has its one end thereof being correspondingly connected and soldered to one of thefirst contacts 1813. - The
second spring plate 182 is located at a lower side of thelens holder 11 along the Z-axis direction opposite to thefirst spring plate 181, and comprises at least two individual and separatedsecond spring member 1821. Each one of thesecond spring members 1821 comprises: a secondouter rim 1822 connected to themovable frame 12, a secondinner rim 1823 for flexibly retaining a bottom position of thelens holder 11 along the Z-axis direction, at least one secondinner string 1824 extending and connecting between the secondouter rim 1822 and the secondinner rim 1823, and a second contact (not shown inFIGS. 3 and 4 ) located at the secondouter rim 1822. Each one of thesuspension wires 183 has its one end thereof being correspondingly connected and soldered to one of thefirst contacts 1813. Wherein, each one of the secondinner rims 1823 of thesecond spring members 1821 is coupled with the drivingcoil 131 of theelectromagnetic driving module 13, while the second contact of thesecond spring member 1821 is electrically coupled to thesecond circuit board 19 and then further coupled with one of the six pins of the 6-pin Hall element 16. - It is worth to mention that, as shown in.
FIG. 3 andFIG. 4 , although there are a plurality of first connectingparts 1816 being formed between thefirst spring members 181 while a plurality of second connectingparts 1825 are further formed between thesecond spring members 182; however, the function and purpose of these first and second connectingparts first spring plate 181 and thesecond spring plate 182 are assembled onto the electromagneticlens driving device 1, these first and second connectingparts lens driving device 1 of the invention. After then, thosefirst spring members 1811 will be separated from each other and become individual members, while thosesecond spring members 1821 will also be separated from each other and also become individual members. - In the present invention, the outer rim of the
second circuit board 19 and the outer rim of thefirst spring plate 181 are both fixed to a top surface of themovable frame 12, and thus are movable together with themovable frame 12 horizontally. The 6-pin Hall element 16 if mounted on abent part 191 of thesecond circuit board 19; and in addition, asensing magnet 112 for Z-axis position is furnished on thelens holder 11 at a location corresponding to and nearby the 6-pin Hall element 16. Moreover, the end of each one of thesuspension wires 183 that is soldered to thefirst contact 1813 is also coupled to thesecond circuit hoard 19, and thus is further coupled to one of the pins of the 6-pin Hall element 16 by means of thesecond circuit board 19. The other end of each one of thesuspension wires 183 is connected to thefirst circuit board 17 and is further coupled with thecontrol unit 15. - Please refer to
FIG. 5 which is a schematic view of the six pins of the 6-pin Hall element of the electromagnetic lens driving device of the present invention. Taking the example of the 6-pin Hall element of Model No. AKM 7345 produced by Asahi Kasei Microdevices Corp., its sixpins 161 can be numbered as A1, A2, B1, B2, C1 and C2, respectively, and the feature of each pin is shown in the following Table One. -
TABLE One descriptions of pins of AKM 7345 Hall element Pin No. Name Type I/O Description Notes A1 VDD PWR — Input Power pin Power Supply B1 SDA D I/O Data Digital pin C1 OUT1 A O Driver Analog pin output 1 C2 OUT2 A O Driver Analog pin output 2 B2 SCL D I Clock Digital pin A2 VSS GND — Ground Ground pin - Wherein, pin A1 is VDD (pin for input power) whose function is to input power supply of 2.65V˜3.6V (Volt) for driving the 6-
pin Hall element 16. Pin A2 is VSS whose function is ground. Pin B1 is SDA whose function is to input and output digital data signals. Pin B1 is SCL whose function is to input clock signals. Pins C1 and C2 are for outputting driving current of 79 mA-142 mA (120 mA preferred) to the drivingcoil 131 ofelectromagnetic driving module 13 in order to perform the auto-focusing and/or zooming operations. - Please refer to
FIG. 6 andFIG. 7 , which respectively are the perspective assembled view and the partial cross-sectional view of the detailed positions of thesuspension wires 183 of the electromagneticlens driving device 1 according to the present invention's first embodiment. As shown inFIG. 6 andFIG. 7 , in the first embodiment of the invention, each one of thesuspension wire 183 has its one end (upper end) connects to a correspondingfirst contact 1813 of thefirst spring member 1811, and couples to thesecond circuit board 19 via the first spring,member 1811, and thus further couples to one of the pins A1, A2, and B2 of the 6-pin Hall element 16 furnished on thesecond circuit board 19. Another end (lower end) of each one of thesuspension wire 183 is connected to one of the four corners of thebottom cover 21 and is electric coupled to thecontrol 15 furnished on thefirst circuit board 17. Because the lower end of eachsuspension wire 183 is fixed to thebottom cover 21 which is a fixed component, and the upper end of eachsuspension wire 183 is fixed to thefirst contact 1813 of the firstouter rim 1814 of thefirst spring member 1811, and the firstouter rim 1814 of eachfirst spring member 1811 is connected to themovable frame 12, and the firstinner rim 1812 of eachfirst spring member 1811 is connected to thelens holder 22; therefore, thesesuspension wires 183 substantially lift and suspend themovable frame 13 together with thelens holder 11 above thefirst circuit board 17. Such that, themovable frame 12 can only hi-directionally move relative to thefirst circuit board 17 along the X-axis and the Y-axis in a restricted manner, but almost cannot move along the Z-axis direction. - In the present invention, the second contact of each one of the
second spring members 1821 is coupled to thesecond circuit board 19 by means of one of the following structure: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let the upper end of the extending part connect to thesecond circuit board 19, or soldering a connecting wire at the second contact and let the upper end of the connecting wire connect to thesecond circuit board 19. These structures will be described in detail below. - Please refer to
FIG. 8 andFIG. 9 , which respectively are the perspective assembled view and the partial cross-sectional view of the detailed positions of thesecond spring plate 182 of the electromagneticlens driving device 1 according to the present invention's first embodiment. As shown inFIG. 8 andFIG. 9 , in the first embodiment of the invention, thesecond spring plate 182 comprises two independent and separatedsecond spring members 1821. Each one of thesecond spring members 1821 includes a thin elongated extending,part 1827 which is extended from thesecond contact 1826 and id bent toward thesecond circuit board 19 in such a manner that, the upper end of the extendingpart 1827 is contacted and soldered with thesecond circuit board 19, and thus further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16. - As shown in
FIG. 10 which is a schematic view showing a connecting way of thesecond spring plate 182 and the drivingcoil 131 of theelectromagnetic driving module 13 of the electromagneticlens driving device 1 according to the present invention's first embodiment. Thesecond spring plate 182 comprises two independent and separatedsecond spring members 1821. Each one of thesecond spring members 1821 includes asoldering point 1828 at its secondinner rim 1823. Each one of the twosoldering point 1828 is soldered with an end of thewire 1311 of the drivingcoil 131 of theelectromagnetic driving module 13. That means, the secondinner rim 1823 of eachsecond spring member 1821 is electric coupled with the drivingcoil 131 of theelectromagnetic driving module 13 by means of thewire 1311 soldered at itssoldering point 1828. In addition, thesecond contact 1826 of eachsecond spring member 1821 is coupled to thesecond circuit board 19 via the extendingpart 1827, and thus is further coupled with one of the pins C1 and C2 of the 6-pin Hall element 16. Thereby, the analog current signals output from the pins C1 and C2 of the 6-pin Hall element 16 can be used to drive the drivingcoil 13 of theelectromagnetic driving module 13 in order to let thelens holder 11 move relative to themovable frame 12 for performing the auto-focusing and/or zooming operations along the Z-axis direction. - In the present invention, there are several ways to electrically conduct the driving coil of the electromagnetic driving module. For example,
FIGS. 12A to 12C are respectively the schematic views of three different embodiments of the ways to electrically conduct the driving coil of the electromagnetic driving module of the electromagnetic lens driving device of the invention. In addition,FIG. 13A andFIG. 13B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12A .FIG. 14A andFIG. 14B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12B .FIG. 15A andFIG. 15B are respectively the top view and schematic perspective view of the embodiment shown inFIG. 12C . - Please refer to
FIG. 12A ,FIG. 13A andFIG. 13B , which illustrate an embodiment of the way to electrically conduct the driving coil of the electromagnetic driving module of the first embodiment as shown inFIGS. 8-10 . That is, thesecond spring plate 182 a includes four independent and separatedsecond spring members 1821 a. Among them, there are two of thesecond spring members 1821 a that, each one of these twosecond spring members 1821 a includes asoldering point 1828 a at its secondinner rim 1823 a. Each one of the twosoldering point 1828 a is soldered with an end of thewire 1311 of the drivingcoil 131 of theelectromagnetic driving module 13. That means, the secondinner rim 1823 a of each of these twosecond spring member 1821 a is electric coupled with the drivingcoil 131 of theelectromagnetic driving module 13 by means of thewire 1311 soldered at itssoldering point 1828 a. In addition, thesecond contact 1826 a of each of these twosecond spring members 1821 a is coupled to thesecond circuit board 19 via an extendingpart 1827 a extending from thesecond contact 1826 a toward thesecond circuit board 19, and thus is further coupled with one of the pins C1 and C2 of the 6-pin Hall element 16. In addition, similar to theelectromagnetic driving module 13 of the first embodiment shown inFIGS. 8-10 , thefirst spring plate 181 a shown inFIG. 12A ,FIG. 13A andFIG. 13B also includes at least fourfirst spring members 1811 a. Each one of these fourfirst spring members 1811 a includes a firstinner rim 1812 a for flexibly retaining a top position of thelens holder 11 along the Z-axis direction and afirst contact 1813 a which is connected with onesuspension wire 183. Each one of thesuspension wires 183 extends from thefirst spring members 1811 a toward thefirst circuit board 17 and couples to thecontrol unit 15. The firstouter rim 1814 a of each one of these fourfirst spring members 1811 a is coupled to thesecond circuit board 19 and then is further coupled to one of the pins A1, A2, B1 and B2 of the 6-pin.Hall element 16 respectively. Thereby, the four pins A1, A2. B1 and B2 of the 6-pin Hall element 16 are coupled to thecontrol unit 15 by means of the four first spring members of the first spring plate and the four suspension wires, while the other two pins C1 and C2 of the 6-pin Hall element 16 are coupled to the drivingcoil 131 of theelectromagnetic driving module 13 by means of the bent extendingparts 1827 a and the secondinner rims 1823 a of the twosecond spring members 1821 a and thesecond circuit board 19. By means of such novel electric coupling structure, thecontrol 15 can detect the signals of theOIS module 14 to obtain the X-and-Y axial positions of themovable frame 12 relative to thefirst circuit board 17, and then generates a control signal according to the X-and-Y axial positions of themovable frame 12, and then sends this control signal to the 6-pin.Hall element 16. Therefore, the 6-pin Hall element 16 not only can provide its own feedback controlling function according to the Z-axial position of lens, but also can accept the control signal from thecontrol unit 15 and then providing the current for driving the auto-focus module 13 based on the control signal received from thecontrol unit 15, so as to achieve the goal of tri-axis close-loop feedback controlling for theelectromagnetic driving module 13. - Please refer to the embodiment shown in
FIG. 12B ,FIG. 14A andFIG. 14B , wherein, thesecond spring plate 182 b also includes two or four independent and separatedsecond spring members 1821 b. In which, the secondinner rim 1823 b of each one of two of thesecond spring members 1821 b is formed with a soldering point 828 b. Eachsoldering point 1828 b is soldered with one end of thewires 1311 of the drivingcoil 131 of theelectromagnetic driving module 13. However, thesecond contact 1826 b of each one of two of thesecond spring members 1821 b is soldered with a lower end of a connectingwire 184. The other end (upper end) of each connectingwire 184 is connected to thesecond circuit board 19, and is further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16. Since the electrical conduction method between the pins A1, A2, B1 and B2 of the 6-pin Hall element 16 and thecontrol unit 15 is exactly the same as the embodiment previously illustrated inFIG. 12A ,FIG. 13A andFIG. 13B , and thus will not be described in detailed here. - Please refer to the embodiment shown in
FIG. 12C ,FIG. 14A andFIG. 1413 , which does not rely on the second spring plate to electric conduct the driving coil of the electromagnetic driving module. In contrast, as shown inFIG. 12C , thefirst spring plate 181 c includes at least six independent and separatedfirst spring members first spring members first spring members 1811 c that each of these fourfirst spring members 1811 c includes thefirst contact 1813 c which is coupled with thecontrol unit 15 by means of thesuspension wire 183 connected to thefirst contact 1813 c. The other twofirst spring members 1811 c′ do not connect to thesuspension wires 183, in addition, each one of these twofirst spring members 1811 c′ includes asoldering point 1817 located on the firstinner rim 1812 c′. Thesoldering point 1817 of each one of these twofirst spring members 1811 c′ is soldered with one end of thewires 1311 of the drivingcoil 131, and thus is coupled with theelectromagnetic driving module 13. Wherein, the firstinner rims 1812 c′ of the twofirst spring members 1811 c′ are coupled with two ends of the drivingcoil 131 of theelectromagnetic driving module 13, in the mean time, either the first contact or the firstouter rim 1814 c of each one of the twofirst spring members 1811 c′ is coupled to thesecond circuit board 19 and is further coupled to one of the pins C1 and C2 of the 6-pin Hall element 16, so as to provide a current to theelectromagnetic driving module 13 for controlling its operations. Since the electrical conduction method between the pins A1, A2, B1 and B2 of the 6-pin Hall element 16 and thecontrol unit 15 is exactly the same as the embodiment previously illustrated inFIG. 12A ,FIG. 13A andFIG. 13B , and thus will not be described in detailed here. - The other embodiments of the present invention described below generally comprise the same or similar components, structures and features as the first embodiment illustrated above, and thus the same numerals and names will be assigned to the same or similar components, only that an additional alphabet will be added after the numeral for distinguishing the different embodiments, and no detailed descriptions will be provided for these same or similar components.
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FIG. 17 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagnetic lens driving device according to a second embodiment of the present invention. According to this second embodiment, the electromagnetic lens driving device 1 a comprises: a lens holder 11 a, amoveable frame 12 a, anelectromagnetic driving module 13 a, anOIS module 14 a, acontrol unit 15 a, a 6-pin Hall element 16, afirst circuit board 17 a, anelectric coupling structure 18 a, asecond circuit board 19 a, acasing 20 a, abottom cover 21 a and atop cover 22. Wherein, the lens holder 11 a,moveable frame 12 a,electromagnetic driving module 13 a,OIS module 14 a,control unit 15 a, 6-pin Hall element 16,first circuit board 17 a,second circuit board 19 a, casing 20 a and bottom cover 21 a have similar structures and features of which previously illustrated in the first embodiment shown inFIG. 1 andFIG. 16 , and thus no detailed descriptions will be provided for these similar components. The differences between the electromagnetic lens driving device 1 a of this second embodiment and the first embodiment are described below. - The
top cover 22 is located between the casing 20 a and thesecond circuit board 19 a, and can clamp and fix thesecond circuit board 19 a and the firstouter rim 1814 a of eachfirst spring member 1811 a of thefirst spring plate 181 a to theprotrusions 121 formed on the upper surface of themovable frame 12 a. In the mean time, thetop cover 22 can also prevent the lens holder 11 a from dropping out of themovable frame 12 a when moving along the Z-axis direction. - The
electric coupling structure 18 a of this second embodiment shown inFIG. 17 also comprises afirst spring plate 181 a (also referred as upper spring plate), asecond spring plate 182 a (also referred as lower spring plate) and foursuspension wires 183. However, in this second embodiment, thesecond spring plate 182 a comprises four independent and separatedsecond spring members second spring members 1821 a are formed with a thin elongated extendingpart 1827 a extending from thesecond contact 1826 a and asoldering point 1828 a located at the secondinner rim 1823 a. The extendingpart 1827 a is bent toward thesecond circuit board 19 such that the end of the extendingpart 1827 a can connect to thesecond circuit board 19. The soldering points 1828 a are soldered with two ends of the wires of the drivingcoil 131 of theelectromagnetic driving module 13. The other twosecond spring members 1821 a′ of thesecond spring plate 182 a do not have the extending parts nor the soldering points. Theelectric coupling structure 18 a of this second embodiment shown inFIG. 17 is corresponding to the embodiment shown inFIG. 12A .FIG. 13A andFIG. 13B . -
FIG. 18 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagneticlens driving device 1 b according to a third embodiment of the present invention. According to this third embodiment, the electromagneticlens driving device 1 b comprises: alens holder 11 b, amoveable frame 12 b, anelectromagnetic driving module 13 b, anOIS module 14 b, acontrol unit 15 b, a 6-pin Hall element 16, afirst circuit board 17 b, an electric coupling structure 18 h a second circuit board 19 b, acasing 20 b, abottom cover 21 b and atop cover 22 b. Wherein, the lens holder lib,moveable frame 12 b,electromagnetic driving module 13 b,OIS module 14 b,control unit 15 b, 6-pin Hall element 16,first circuit board 17 b, second circuit board 19 b, casing 20 b,bottom cover 21 b andtop cover 22 b have similar structures and features of which previously illustrated in the second embodiment shown inFIG. 17 , and thus no detailed descriptions will be provided for these similar components. The differences between the electromagneticlens driving device 1 b of this third embodiment and the second embodiment are described below. - According to the electromagnetic
lens driving device 1 b of this third embodiment shown inFIG. 18 , although thesecond spring plate 182 b comprises four independent and separatedsecond spring members second spring members 1821 b are formed with thesoldering points 1828 b on their secondinner rims 1823 b, but there is no extending part being formed on thesecond spring members 1821 b. In contrast, two connectingwires 184 are connected between the secondouter rims 1822 b of the twosecond spring members 1821 b having thesoldering points 1828 b and thesecond circuit board 19. Each soldering point 1828 h is soldered with an end of the wires of the drivingcoil 131 of theelectromagnetic driving module 13 b. The other twospring members 1821 b′ do not have any connecting wire nor soldering point. Theelectric coupling structure 18 b of this third embodiment shown inFIG. 18 is corresponding to the embodiment shown inFIG. 12B ,FIG. 14A andFIG. 14B . -
FIG. 19 is a schematic perspective view of the tri-axis close-loop feedback controlling module for the electromagneticlens driving device 1 c according to a fourth embodiment of the present invention. According to this fourth embodiment, the electromagneticlens driving device 1 c comprises: alens holder 11 c, amoveable frame 12 c, anelectromagnetic driving module 13 c, anOIS module 14 c, acontrol unit 15 c, a 6-pin Hall element 16, afirst circuit board 17 c, anelectric coupling structure 18 c asecond circuit board 19 c, acasing 20 c, abottom cover 21 c and atop cover 22 c. Wherein, thelens holder 11 c,moveable frame 12 c,electromagnetic driving module 13 c,OIS module 14 c,control unit 15 c, 6-pin Hall element 16,first circuit board 17 c,second circuit board 19 c, casing 20 c,bottom cover 21 c andtop cover 22 c have similar structures and features of which previously illustrated in the second embodiment shown inFIG. 17 , and thus no detailed descriptions will be provided for these similar components. The differences between the electromagneticlens driving device 1 c of this fourth embodiment and the second embodiment are described below. - According to the electromagnetic
lens driving device 1 c of this fourth embodiment shown inFIG. 19 , theelectric coupling structure 18 c does not rely on thesecond spring plate 182 c to electric conduct the drivingcoil 131 of theelectromagnetic driving module 13 c. In contrast, as shown inFIG. 19 , thefirst spring plate 181 c includes at least six independent and separatedfirst spring members first spring members first spring members 1811 c that each of these fourfirst spring members 1811 c includes thefirst contact 1813 c which is coupled with thecontrol unit 15 by means of thesuspension wire 183. The other twofirst spring members 1811 c′ do not connect to thesuspension wires 183, in addition, each one of these twofirst spring members 1811 c′ includes asoldering point 1817 located on the firstinner rim 1812 c′. Thesoldering point 1817 of each one of these twofirst spring members 1811 c′ is soldered with one end of the wires of the drivingcoil 131, and thus is coupled with theelectromagnetic driving module 13. Theelectric coupling structure 18 c of this fourth embodiment shown inFIG. 19 is corresponding to the embodiment shown inFIG. 12C ,FIG. 15A andFIG. 15B . - To sum up, the tri-axis close-loop feedback controlling module for electromagnetic lens driving device of the invention utilizes a 6-pin Hall element in the second circuit board fixed to the movable frame (lens module). The movable frame is suspended above a substrate (first circuit board). The movable frame is furnished with a lens holder for holding a lens therein which is movable along the X-axis direction. The lens holder is flexibly suspended within an inner compartment of the movable frame by means of an upper spring plate and a lower spring plate fixed on two ends of the lens holder. The rim of the movable frame is mounted with at least one driving magnet. The outer rim of the lens holder is wound with a driving coil corresponding to the driving magnet. By driving the driving coil to move the lens holder together with the lens thereinside along the Z-axis (optical path), the functions of auto-focusing and/or zooming are achieved. In an embodiment of the novel electric coupling structure of the invention, two ends of the driving coil are coupled to the two pins (C1, C2) of the Hall element by means of the two upward bent conduct ends of the lower spring plate. In the mean time, by electric connecting the four contacts of the upper spring plate with the other four pins (A1, A2, B1, B2) of the Hall element, and using the four suspension wires (located at the four corners of the upper spring plate) of a suspension mechanism to electrically connecting the other four pins with the substrate (first circuit board). By means of such novel electric coupling structure, the electromagnetic lens driving device can utilize the 6-pin Hall element to detect the X-and-Y axial positions of the movable frame relative to the substrate (first circuit board), and uses the control unit located on the substrate (first circuit board) to calculate, and then adjusts the biased auto-focusing and/or zooming point of the lens along the Z-axis direction by coupling the two pins (C1, C2) of the Hall element to the driving coil. Therefore, the goal of tri-axis close-loop feedback controlling for the auto-focusing module and the OIS module can be achieved.
- While the present invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be without departing from the spirit and scope of the present invention.
Claims (18)
1. A tri-axis close-loop feedback controlling module for electromagnetic lens driving device, comprising:
a lens holder for holding a lens;
a movable frame for receiving the lens holder in such a manner that the lens holder is movable relative to the movable frame along a Z-axis direction;
an electromagnetic driving module, furnished between the movable frame and the lens holder for driving the lens holder to move within the movable frame along the Z-axis direction;
an optical image stabilization (OIS) module for driving the movable frame together with the lens holder to perform bi-directional movements along a X-axis direction and a Y-axis direction; wherein the X-axis, Y-axis and Z-axis are perpendicular to each other;
a control unit, coupled to the OIS module; the control unit being able to detect and control operations of the OIS module so as to generate a control signal according to the operations of the OIS module; and
a Hall element having at least six pins; wherein, two of the at least six pins are coupled with the electromagnetic driving module for supplying a current to the electromagnetic driving module in order to control operations of the electromagnetic driving module; other four of the at least six pins are coupled with the control unit for receiving the control signal from the control unit in order to control the current supplied to the electromagnetic driving module based on the control signal, so as to achieve the function of tri-axis close-loop feedback controlling the electromagnetic driving module.
2. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 1 , further comprising:
a first circuit board; the control unit being furnished on the first circuit board and coupled with the OIS module; and
an electric coupling structure; the Hall element being coupled with the electromagnetic driving module and the control unit be means of the electric coupling structure;
wherein, the electric coupling structure comprises a first spring plate located at one side of the lens holder along the Z-axis direction; the first spring plate comprises at least four independent and separated first spring members; each one of these first spring members comprises a first inner rim for flexibly retaining a top position of the lens holder along the Z-axis direction and a first contact which is connected with one suspension wire; each one of the suspension wires extends from the first spring members toward the first circuit board and couples to the control unit; the Hall element is coupled with the four first spring members and the electromagnetic driving module, and can receive a control signal from the control unit via the suspension wires in order to control and adjust a current provided by the Hall element to the electromagnetic driving module.
3. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 2 , wherein the first spring plate is in the form of hollowed out thin metal plate; in addition, each one of the first spring members of first spring plate comprises: a first outer rim connected to the movable frame, a first inner rim connected to the lens holder, at least one first inner string extending and connecting between the first outer rim and the first inner rim, and a first contact located at the first outer rim; each one of the suspension wires has its one end thereof being correspondingly connected to one of the first contacts.
4. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 3 , wherein the electromagnetic lens driving device further comprises a second circuit board; the Hall element is furnished on the second circuit hoard; a sensing magnet for Z-axis position is furnished on the lens holder at a location corresponding to the Hall element; in addition, the end of each suspension wire which is connected to the first contact is coupled with the second circuit board, and thus is further coupled to one of the pins of the Hall element via the second circuit board.
5. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 4 , wherein the electric coupling structure further comprises a second spring plate located at a lower side of the lens holder along the Z-axis direction opposite to the first spring plate; the second spring plate comprises at least two individual and separated second spring member; each one of the second spring members comprises: a second outer rim connected to the movable frame, a second inner rim fixed on the lens holder for flexibly retaining a bottom position of the lens holder along the Z-axis direction, at least one second inner string extending and connecting between the second outer rim and the second inner rim, and a second contact located at the second outer rim; wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil; wherein the second inner rim of each second spring member is electric coupled with the driving coil of the electromagnetic driving module; in addition, the second contact of each second spring member is coupled to the second circuit board and thus is further coupled with one of the pins of the Hall element.
6. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 5 , wherein the second contact of each one of the second spring members is coupled to the second circuit board by means of one of the following structures: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let an end of the extending part connect to the second circuit board, and soldering a connecting wire at the second contact and let an end of the connecting wire connect to the second circuit board.
7. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 4 , wherein the first spring plate includes at least six independent and separated first spring members; wherein, among these six first spring members, there are four first spring members that each of these four first spring members includes the first contact which is coupled with the control unit by means of the suspension wire; while the other two first spring members do not connect to the suspension wires and are coupled to the electromagnetic driving module via the first inner rim;
wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil;
wherein the first inner rim of each one of the other two first spring members is coupled with the coil of the electromagnetic driving module; in addition, the first outer rim of each one of the other two first spring members is coupled to the second circuit board and is further coupled to one of the pins of the Hall element in order to supply the current to the electromagnetic driving module in order to control operations of the electromagnetic driving module.
8. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 2 , wherein the OIS module comprises:
at least a first stabilizing coil furnished on the first circuit board and coupled to the control unit;
at least a second stabilizing coil furnished on the first circuit board and are perpendicular to the first stabilizing coils; in addition, the second stabilizing coils being coupled to the control unit;
at least a first stabilizing magnet mounted on the movable frame and corresponding to the first stabilizing coil;
at least a second stabilizing magnet mounted on the movable frame and corresponding to the second stabilizing coil; and
at least two position sensors mounted on the first circuit board and coupled to the control unit; the at least two position sensors being used to detect the position of the movable frame relative to the first circuit board along the X-axis direction and the Y-axis direction;
9. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 8 , the first and second stabilizing magnets are the same with the driving magnets of the electromagnetic driving module.
10. A tri-axis close-loop feedback controlling module for electromagnetic lens driving device, comprising:
a lens holder for holding a lens;
a movable frame for receiving the lens holder in such a manner that the lens holder is movable relative to the movable frame along a Z-axis direction;
an electromagnetic driving module, furnished between the movable frame and the lens holder for driving the lens holder to move within the movable frame along the Z-axis direction;
a first circuit board;
an optical image stabilization (OIS) module furnished between the first circuit board and the movable frame for driving the movable frame together with the lens holder to perform bi-directional movements along a X-axis direction and a Y-axis direction; wherein the X-axis, Y-axis and Z-axis are perpendicular to each other;
a control unit, coupled to the OIS module; the control unit being able to detect and control operations of the OIS module so as to generate a control signal according to the operations of the OIS module;
a first spring plate located at one side of the lens holder along the Z-axis direction; the first spring plate comprising at least four independent and separated first spring members; each one of these first spring members comprising a first inner rim for flexibly retaining a top position of the lens holder along the Z-axis direction and a first contact which is connected with one suspension wire; each one of the suspension wires being extending from the first spring members toward the first circuit board and coupling to the control unit; and
a Hall element coupled with the four first spring members and the electromagnetic driving module, and being able to receive a control signal from the control unit via the suspension wires in order to control and adjust a current provided by the Hall element to the electromagnetic driving module.
11. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 10 , wherein the Hall element has at least six pins; wherein, two of the at least six pins are coupled with the electromagnetic driving module for supplying the current to the electromagnetic driving module in order to control operations of the electromagnetic driving module; other four of the at least six pins are coupled with the control unit for receiving the control signal from the control unit in order to control the current supplied to the electromagnetic driving module based on the control signal.
12. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 11 , wherein the first spring plate is in the form of hollowed out thin metal plate; in addition, each one of the first spring members of first spring plate comprises: a first outer rim connected to the movable frame, a first inner rim connected to the lens holder, at least one first inner string extending and connecting between the first outer rim and the first inner rim, and a first contact located at the first outer rim; each one of the suspension wires has its one end thereof being correspondingly connected to one of the first contacts.
13. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 12 , wherein the electromagnetic lens driving device further comprises a second circuit board; the Hall element is furnished on the second circuit board; a sensing magnet for Z-axis position is furnished on the lens holder at a location corresponding to the Hall element, in addition, the end of each suspension wire which is connected to the first contact is coupled with the second circuit board, and thus is further coupled to one of the pins of the Hall element via the second circuit board.
14. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 13 , wherein the electric coupling structure further comprises a second spring plate located at a lower side of the lens holder along the Z-axis direction opposite to the first spring plate; the second spring plate comprises at least two individual and separated second spring member; each one of the second spring members comprises: a second outer rim connected to the movable frame, a second inner rim fixed on the lens holder for flexibly retaining a bottom position of the lens holder along the Z-axis direction, at least one second inner string extending and connecting between the second outer rim and the second inner rim, and a second contact located at the second outer rim; wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil; wherein the second inner rim of each second spring member is electric coupled with the driving coil of the electromagnetic driving module; in addition, the second contact of each second spring member is coupled to the second circuit board and thus is further coupled with one of the pins of the Hall element.
15. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 14 , wherein the second contact of each one of the second spring members is coupled to the second circuit board by means of one of the following structures: bending a thin elongated extending part extended from the second contact toward the second circuit so as to let an end of the extending part connect to the second circuit board, and soldering a connecting wire at the second contact and let an end of the connecting wire connect to the second circuit board.
16. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 13 , wherein the first spring plate includes at least six independent and separated first spring members; wherein, among these six first spring members, there are four first spring members that each of these four first spring members includes the first contact which is coupled with the control unit by means of the suspension wire; while the other two first spring members do not connect to the suspension wires and are coupled to the electromagnetic driving module via the first inner rim;
wherein the electromagnetic driving module comprises at least a driving coil furnished on the lens holder and at least two driving magnets mounted on the movable frame and corresponding to the driving coil;
wherein the first inner rim of each one of the other two first spring members is coupled with the coil of the electromagnetic driving module; in addition, the first outer rim of each one of the other two first spring members is coupled to the second circuit board and is further coupled to one of the pins of the Hall element in order to supply the current to the electromagnetic driving module in order to control operations of the electromagnetic driving module.
17. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 11 , wherein the OIS module comprises:
at least a first stabilizing coil furnished on the first circuit board and coupled to the control unit;
at least a second stabilizing coil furnished on the first circuit board and are perpendicular to the first stabilizing coils; in addition, the second stabilizing coils being coupled to the control unit;
at least a first stabilizing magnet mounted on the movable frame and corresponding to the first stabilizing coil;
at least a second stabilizing magnet mounted on the movable frame and corresponding to the second stabilizing coil; and
at least two position sensors mounted on the first circuit board and coupled to the control unit; the at least two position sensors being used to detect the position of the movable frame relative to the first circuit board along X-axis direction and the Y-axis direction.
18. The tri-axis close-loop feedback controlling module for electromagnetic lens driving device of claim 17 , wherein, the first and second stabilizing magnets are the same with the driving magnets of the electromagnetic driving module.
Priority Applications (4)
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US14/268,205 US20140327965A1 (en) | 2013-05-06 | 2014-05-02 | Tri-Axis Close Loop Feedback Controlling Module for Electromagnetic Lens Driving Device |
US15/226,043 US10168506B2 (en) | 2013-05-06 | 2016-08-02 | Tri-axis close loop feedback controlling module for electromagnetic lens driving device |
US15/706,915 US10613295B2 (en) | 2013-05-06 | 2017-09-18 | Tri-axis close-loop feedback controlling module for electromagnetic lens driving device |
US16/196,376 US11256065B2 (en) | 2013-05-06 | 2018-11-20 | Tri-axis close loop feedback controlling module for electromagnetic lens driving device |
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Application Number | Priority Date | Filing Date | Title |
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US201361819737P | 2013-05-06 | 2013-05-06 | |
US14/268,205 US20140327965A1 (en) | 2013-05-06 | 2014-05-02 | Tri-Axis Close Loop Feedback Controlling Module for Electromagnetic Lens Driving Device |
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US15/706,915 Continuation US10613295B2 (en) | 2013-05-06 | 2017-09-18 | Tri-axis close-loop feedback controlling module for electromagnetic lens driving device |
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US15/226,043 Active 2034-08-24 US10168506B2 (en) | 2013-05-06 | 2016-08-02 | Tri-axis close loop feedback controlling module for electromagnetic lens driving device |
US15/706,915 Active 2035-05-17 US10613295B2 (en) | 2013-05-06 | 2017-09-18 | Tri-axis close-loop feedback controlling module for electromagnetic lens driving device |
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US16/196,376 Active 2035-05-25 US11256065B2 (en) | 2013-05-06 | 2018-11-20 | Tri-axis close loop feedback controlling module for electromagnetic lens driving device |
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Also Published As
Publication number | Publication date |
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CN104142553A (en) | 2014-11-12 |
CN106226886A (en) | 2016-12-14 |
TWI594057B (en) | 2017-08-01 |
US11256065B2 (en) | 2022-02-22 |
TWI623802B (en) | 2018-05-11 |
US10168506B2 (en) | 2019-01-01 |
CN104142553B (en) | 2016-08-24 |
TW201443540A (en) | 2014-11-16 |
TW201827912A (en) | 2018-08-01 |
TW201736930A (en) | 2017-10-16 |
JP2014219675A (en) | 2014-11-20 |
CN106226886B (en) | 2019-08-23 |
TWI655490B (en) | 2019-04-01 |
US10613295B2 (en) | 2020-04-07 |
US20160341927A1 (en) | 2016-11-24 |
JP5802796B2 (en) | 2015-11-04 |
US20190086641A1 (en) | 2019-03-21 |
TWI548926B (en) | 2016-09-11 |
TW201732408A (en) | 2017-09-16 |
US20180003921A1 (en) | 2018-01-04 |
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