WO2013049688A2 - Stabilisation d'image optique fondée sur des mems - Google Patents

Stabilisation d'image optique fondée sur des mems Download PDF

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Publication number
WO2013049688A2
WO2013049688A2 PCT/US2012/058082 US2012058082W WO2013049688A2 WO 2013049688 A2 WO2013049688 A2 WO 2013049688A2 US 2012058082 W US2012058082 W US 2012058082W WO 2013049688 A2 WO2013049688 A2 WO 2013049688A2
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WO
WIPO (PCT)
Prior art keywords
camera
actuators
lens
tangential
motion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2012/058082
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English (en)
Other versions
WO2013049688A3 (fr
Inventor
Roman C. Gutierrez
Robert J. Calvet
Xiaolei Liu
Pat K. Leang
Jose A. Mendez
Corneliu Zaharia
Alexandru F. DRIMBAREAN
Petronel Gheorghe BIGIOI
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DigitalOptics Corp MEMS
Original Assignee
DigitalOptics Corp MEMS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US13/247,895 external-priority patent/US9019390B2/en
Priority claimed from US13/247,906 external-priority patent/US8855476B2/en
Application filed by DigitalOptics Corp MEMS filed Critical DigitalOptics Corp MEMS
Priority to CN201610905935.3A priority Critical patent/CN106569310B/zh
Priority to CN201280047680.1A priority patent/CN103842875B/zh
Publication of WO2013049688A2 publication Critical patent/WO2013049688A2/fr
Publication of WO2013049688A3 publication Critical patent/WO2013049688A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
    • G02B26/0833—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD
    • G02B26/0841—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD the reflecting element being moved or deformed by electrostatic means
    • 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
    • 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
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • G03B5/02—Lateral adjustment of lens
    • 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
    • H04N23/681—Motion detection
    • H04N23/6812—Motion detection based on additional sensors, e.g. acceleration sensors
    • 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
    • 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
    • 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
    • G03B2205/0053—Driving means for the movement of one or more optical element

Definitions

  • This disclosure relates, in general, to optical devices, and more particularly, to a MEMS- based image stabilization system.
  • MEMS-based motion sensors for digital cameras has been developed to address the image degradation that results from human hand tremor.
  • MEMS-based gyroscopes may be used to sense camera motion.
  • an image stabilization system attempts to move the lens or the image sensor to minimize or eliminate the resulting motion-induced blurring of the image.
  • the resulting actuation is performed using conventional actuators.
  • a camera in accordance with a first aspect of the disclosure, includes: a plurality of electrostatic actuators; and an optical image stabilization (OIS) algorithm module operable to command the plurality of actuators to actuate the at least one lens responsive to motion of the camera.
  • OIS optical image stabilization
  • a method of image stabilization includes: sensing a motion of a camera; based upon the sensed motion, determining a desired lens actuation that stabilizes a camera lens; translating the desired lens actuation into desired tangential actuations; and tangentially actuating the at least one lens using a plurality of tangential actuators according to the desired tangential actuations.
  • an actuator device comprising:
  • a stage resiliently supported for movement within a plane; three or more actuators, each coupled to an outer periphery of the stage and operable to apply a force acting in the plane and
  • Fig. 1 is a plan view of an example image stabilization device that utilizes tangential actuation
  • Figs. 2 A - 2F are vector diagrams illustrating the use of the example image stabilization device of Fig. 1 to effect in-plane translational and rotational movement of an optical element;
  • Fig. 3 is a perspective view of an actuator in the device of Fig. 1;
  • Fig. 4A is a partial plan view of the interdigitated fingers for a comb in the actuator of Fig. 3, showing the fingers before the actuator is deployed for operational use;
  • Fig. 4B is a partial plan view of the interdigitated fingers for a comb in the actuator of Fig.
  • Fig. 4C is a partial plan view of the interdigitated fingers for a comb in the actuator of Fig 3, after the comb has been biased to an operating position;
  • Fig. 5 is a plan view of an actuator latch of Figure 3, showing various stages in its engagement with the actuator lever;
  • Figs. 6 A - 6C are vector diagrams illustrating in-plane rotational movement of a stage of the device of Fig. 1 between a "parked" state and an "operating" state;
  • Fig. 6D is a plan view of the stage in the parked state
  • Fig. 6E is a plan view of the stage in the operating state
  • Fig. 6F is a close-up view of the locked stage arm of Figure 6D.
  • Fig. 6G is a close-up view of the unlocked stage arm of Figure 6E.
  • Fig. 7 is a block diagram of an image stabilization system using tangential actuators
  • Fig. 8 is a block diagram of an embodiment of the system of Fig. 7 in which the optical image stabilization algorithm is implemented in a driver integrated circuit
  • Fig. 9 illustrates more details for the driver integrated circuit of Fig. 8.
  • Fig. 10 is a flowchart for the image stabilization process performed by the system of Figs. 8 and 9;
  • Fig. 11 is a block diagram of an embodiment of the system of Fig. 7 in which the optical image stabilization algorithm is implemented in an image processor integrated circuit;
  • Fig. 12 illustrates more details for the driver and image processor integrated circuits of Fig. 11 ;
  • Fig. 13 is a flowchart for the image stabilization process performed by the system of Figs. 11 and 12.
  • an image stabilization fixture 100 includes an a central aperture 105 defined by a circular mounting stage 110 for receiving an optical element such as a lens or group of lenses (not illustrated).
  • Three actuators, designated as an actuator 1, an actuator 2, and an actuator 3, are symmetrically disposed about aperture 105.
  • Each actuator actuates stage 110 in a tangential fashion.
  • a linear displacement 120 introduced by each actuator defines a vector direction that is tangential to a circle enclosing an aperture center 118.
  • linear displacements 120 are tangential to the circle defined by mounting stage 110.
  • a tangential displacement is said to be positive for each actuator as indicated by directions 1 15.
  • Each actuator is thus capable of a positive and a negative displacement in that regard.
  • actuators 1, 2, and 3 each introduce an equal displacement, with actuators 1 and 2 being tangentially negative and actuator 3 being tangentially positive, the resulting tangential actuation of stage 110 is in the positive x direction.
  • Tangential actuation can also introduce a rotation of stage 110 about the z axis.
  • the net actuation of stage 110 is a clockwise rotation (negative ⁇ ) in Figure 2E.
  • the net actuation of stage 110 is a counter-clockwise z axis rotation (positive ⁇ ). In this fashion, stage 110 may be both translated as desired in the x and y plane as well as rotated in the ⁇ direction.
  • the tangential displacement introduced by each actuator 1 through 3 may be represented in a local coordinate system.
  • the x-directed tangential displacement for actuator 3 may be designated as displacement in the L3 direction with the same positive convention as represented by direction 115 of Figure 1.
  • the tangential displacements for actuators 1 and 2 may be represented by local linear coordinates Li and L 2 , respectively.
  • the displacement in dimension Li from actuator 1, the displacement in L 2 from actuator 2, and the displacement in L3 from actuator 3 may all be related to the translation in the x and y dimensions for stage 110 as well as a rotation in ⁇ for stage 110 depending upon the radial distance R from center 118 to the effective tangential actuation point for each actuator.
  • a coordinate transformation is as follows:
  • any suitable actuator may be used to construct actuators 1, 2, and 3 such as a comb actuator or a gap-closing actuator.
  • a biased comb actuator offers attractive travel characteristics such as +/- 50 microns and may be implemented such as discussed in commonly-assigned U.S. Application No. 12/946,670 (the '670 application), filed November 15, 2010, the contents of which are incorporated by reference.
  • each actuator has a fixed portion 121 and a moveable portion 122.
  • fixed portion 121 integrates with an outer frame 125 and includes a plurality of fixed comb supports 112 that extend radially towards moveable portion 122.
  • moveable portion 122 includes a plurality of comb supports 113 that extend radially toward fixed portion 121.
  • Comb supports 112 and 113 alternate with each other to support a plurality of combs 114.
  • combs 114 are not shown in Figure 1 but instead are shown in a closeup view in Figure 4 A through 4C.
  • each actuator 1 through 3 drives stage 110 through a corresponding flexure 106.
  • each flexure 106 may be relatively flexible in the radial direction while being relatively stiff in the tangential direction (corresponding to linear displacements 120 of Figure 1).
  • flexure 106 may comprise a V-shaped folded flexure having a longitudinal axis aligned in the tangential direction.
  • Such a V-shaped flexure permits a radial flexing yet is relatively stiff with regard to displacements 120.
  • a "pseudo-kinematic" placement for stage 110 is achieved that precisely locates center 118 in a rest state yet achieves the desired x-y plane translation and ⁇ rotation during image stabilization.
  • combs 114 using a MEMS process yet achieving a biased deployed state for actuators 1 through 3 may be accomplished using a linear deployment such as discussed in the '670 application.
  • the interdigitated fingers making up each comb 114 may be manufactured in a fully interdigitated state.
  • the fingers for comb 114 are initially disposed such that the associated fixed and moveable comb supports 112 and 113 are spaced apart by approximately the length of the fingers in comb 114.
  • each comb 114 should be spread apart and deployed as shown in Figure 4B. As illustrated in Fig.
  • this deployment can be effected by moving the comb support 113 (and hence, movable portion 122 of Figure 1) in the direction of an arrow 400 to a deployed position that is coplanar with, parallel to and spaced at a selected distance apart from the associated fixed comb support 112, and then fixing moveable portion 122 in the deployed position for substantially coplanar, rectilinear movement with regard to fixed portion 121.
  • moving the comb support 113 and hence, movable portion 122 of Figure 1
  • a deployed position that is coplanar with, parallel to and spaced at a selected distance apart from the associated fixed comb support 112
  • a deployment method involves a coplanar over-center latch 300 and a fulcrum 304 on frame 125.
  • Latch 302 is coupled to frame 125 with a latch flexure 306.
  • a coplanar deployment lever 308 is coupled to moveable portion 122 through a deployment fiexure 310.
  • Deployment lever 308 has a cam surface 312 that is configured to engage with latch
  • lever 308 has a notch for engaging with fulcrum 304 for rotational movement of the lever with regard to fulcrum 304.
  • an acceleration pulse is applied to moveable portion 122 in the direction of an arrow 314 while holding the frame 125 static as shown in Figure 3.
  • This pulse causes deployment lever 308 to rotate about fulcrum 304 towards latch 300.
  • the rotation of the deployment lever 308 about the fulcrum 304 causes cam surface 312 to engage latch 300 as seen in Fig. 5.
  • lever 308 is in an un-deployed position 501 but begins to rotate into intermediate position 502 such that cam surface 312 biases latch 300 and stretches latch fiexure 306.
  • Deployment flexure 310 is shown mostly cutaway for illustration clarity. Continued rotation of lever 308 allows latch flexure 306 to pull latch 300 back down to latch lever 308 into a latched position 503.
  • a small needle or another MEMS device may be inserted into a pull ring 315 ( Figure 3) and actuated accordingly.
  • moveable portion 122 may be deployed using capillary action such as described in commonly-assigned U.S.
  • the actuators Prior to application of the default voltage across combs 114, the actuators may be in a "beginning-of travel,” “power-off or “parked” state. In the parked state, image stabilization in inoperative but center 118 is unaffected. As discussed with regard to Figure 2F, an appropriate displacement for each of actuators 1, 2, and 3 produces a positive rotation in ⁇ but no x-y plane translation. Such a displacement at each comb 114 is thus sufficient to go from the deployed but inactive state shown in Figure 4b to the default operating state of Figure 4C.
  • Figure 6 A shows the rotation from actuators 1, 2, and 3 to go from the parked state to the active optical image stabilization state. As illustrated in Fig.
  • actuators 1, 2, and 3 may again be parked into their inactive states as shown in Figure 6C.
  • actuators 1, 2, and 3 from their parked state to their active optical image stabilization may be better understood with reference to Figures 6D and 6E.
  • the power- off state of the actuator device can be utilized advantageously to protect the device against shock forces and in-plane sagging effects acting on the stage and the flexures during periods of device inactivity.
  • one or more locking arms 308, each having a locking feature 428 disposed thereon can be coupled to the periphery of stage 110, and a corresponding plurality of complementary locking features 430 can be coupled, e.g., to the outer frame 125, and arranged to engage a corresponding one of the complementary locking features 428 on the locking arms 308 when the stage 101 is rotationally disposed in the parked, or power-off state.
  • Figures 6F is a view of the engagement of locking feature 430 with complementary locking feature 428 whereas Figure 6G shows these features in the deployed state. In Fig.
  • the phantom outline 432 delineates the range of motion of the periphery of an end portion of a locking arm 308 and locking feature 428 in the operating state and during an image stabilization operation of the actuator device, and illustrates that no interference will occur between the arm 308, locking feature 428 and the complementary locking feature 430 during such operation.
  • FIG. 7 A block diagram for a control system 700 to control image stabilization using tangential actuation is shown in Figure 7.
  • image stabilization it is conventional to distinguish between intended motion of the camera as opposed to unintended jitter. For example, a user may be deliberately moving a camera through a 90 degree range of motion to image different subjects. Should this deliberate movement not be detected, the image stabilization system would have the impossible and undesirable task of rotating the lens 90 degrees to compensate for such intended motion.
  • One way to distinguish unintended jitter of the camera is to use employ a tracking loop that predicts the intended motion of a camera.
  • control system 700 includes a tracking filter such a Kalman filter 705 that predicts a current lens position based upon previously-measured camera movement.
  • Kalman filter 705 needs some measure of camera motion to make a prediction of what is intended movement of the camera as opposed to unintended jitter.
  • an inertial sensor such as a MEMS-based gyroscope 710 measures the velocity of some reference point on the camera such as aperture center 1 18 discussed previously.
  • the x,y plane velocities for center 118 as obtained from pitch and yaw measurements from gyroscope 710 may be designated as x g and y g , respectively.
  • Such inertial measurements may be supplemented by motion estimates obtained from analyzing the camera image.
  • a camera image processor 720 may also make an estimate for the x,y plane velocities for center 118, which may be designated as x c and y c , respectively.
  • the Kalman filter receives the velocity estimates from gyroscope 710 and camera image processor 720 to filter them so as to make a prediction of the x, y plane velocity for lens center 118 accordingly.
  • This Kalman filter predication for the reference location velocities in the x,y plane may be designated as x 0 and y 0 , respectively.
  • the velocity estimates are filtered through high pass filters 725 to remove gyroscope drift and integrated in integrators 730 and multiplied by an appropriate scale factor in amplifiers 735 to obtain position estimates 740.
  • estimates 740 represent what Kalman filter 705 predicts as the intended position of lens center 118 without the presence of jitter. Any difference between estimates 740 and the actual lens position is treated as jitter and should be compensated for by image stabilization control system 700. It will be appreciated that embodiments of control system 700 may be implemented that do not include such a predicted tracking loop. For example, the inertial measurements from gyroscope 710 may be merely high-pass filtered to provide a cruder estimate of the intended camera velocities. Such velocity estimates may be integrated as discussed above to obtain position estimates 740.
  • each actuator is associated with a position sensor.
  • actuator 1 may be associated with a position sensor 741 that senses the Li displacement discussed earlier.
  • position sensor 741 may sense the capacitance across combs 114 to make an estimate of the Li displacement.
  • other type of position sensors may be used such as Hall sensors.
  • actuators 2 and 3 are associated with corresponding position sensors 742 and 743.
  • Position sensor 742 thus senses the L 2 displacement whereas sensor 743 senses the L 3 displacement.
  • the tangential actuations Li through L 3 may be converted into a sensed position x s , y s by inverting the equations discussed previously with ⁇ equaling zero.
  • the difference between the sensed position and the Kalman- filter-predicated position is then determined using adders 755.
  • the outputs from adders 755 may then be filtered in controllers 760 and compensators 765 to get the resulting x and y coordinates of where the lens should be actuated to compensate for the jitter of the camera.
  • a translator 770 translates the x and y coordinates into tangential coordinates L ls L 2 , and L 3 as described in the equation above with ⁇ equaling zero.
  • the outputs from translator 770 thus represents the desired actuation of actuators 1 through 3.
  • the Kalman filter prediction and generation of the resulting desired actuation takes place at a relatively slow data rate in that significant calculation is necessary. But the actual actuation to drive actuators 1 through 3 to the desired degree of actuation may take place at a relatively high data rate.
  • a demarcation 771 in Figure 7 indicates the partition of a digital domain for control system 700 into relatively high and relatively low data rates.
  • a demarcation 772 indicates the partition of control system 700 into digital and analog domains.
  • control system 700 can uses gyroscope 710 that is sensing camera motion in the Cartesian x,y plane to advantageously achieve image stabilization using just three tangential MEMS actuators.
  • Image stabilization using system 700 may be implemented using a number of alternative embodiments.
  • the aggregation of digital components and signal paths from Kalman filter 705 through translators 770 and 750 may be designated as an OIS algorithm module.
  • the OIS algorithm module may be implemented in various integrated circuit architectures.
  • one embodiment of a camera 800 includes an OIS algorithm module 805 within a MEMS driver integrated circuit (IC) 810.
  • Camera 800 includes MEMS tangential actuators for image stabilization as discussed above as well as actuators for autofocus (AF) purposes and zooming purposes. These MEMS actuators are shown collectively as a MEMS module 815.
  • Driver IC 810 drives MEMS module 815 with AF commands 820 from an AF driver 830 as well as in-plane tangential actuation commands 825 from an optical image stabilization (OIS) driver 835.
  • MEMS module 815 includes positions sensors such as discussed with regard to Figure 7 so that driver IC 810 may receive in-plane tangential actuator positions 840.
  • a bus such as an I C bus 845 couples driver IC 810 to other camera components.
  • gyroscope 710 imager 720
  • image processor 850 image processor 850
  • MCU 855 micro controller unit
  • FIG. 9 shows the resulting control loops for camera 800.
  • the bus master may be either the ISP or the MCU as represented by master module 900.
  • OIS algorithm module 805 is a simplified version in that the tracking filter is omitted and the intended motion of the camera approximated by high pass filtering 910 the pitch and yaw rates from gyroscope 710. Because the data flow on a master- slave bus is always from slave-to-master or from master-to-slave, the rotation rates from gyroscope 710 first flow to master module 900 and then to driver IC 810.
  • Master module 900 controls both gyroscope 710 and driver IC 810 in that regard. For illustration clarity, just a single combined channel is shown for OIS algorithm module 805. Thus, a translator 920 represents translators 770 and 750 of Figure 7. The actual and desired lens positions are translated within translator 920 with respect to a lens neutral position 925.
  • the resulting data traffic on bus 845 is shown in Figure 10.
  • Image stabilization necessarily draws some current and thus it is desirable to only commence image stabilization while a user is taking a digital photograph.
  • the OIS data traffic begins in an initial step 1000 with master module 900 as the I C bus master.
  • gyroscope 710 may begin taking inertial measurements of camera movement and OIS driver 835 may command MEMS actuators 815 to transition from a parked to an active state as represented by step 1005.
  • Master module 900 then reads 6 bytes of gyroscopic data in a step 1010 so that the data may be written to driver IC in a step 1015.
  • OIS algorithm module 805 can then determine the appropriate amount of actuation to address the camera jitter in a step 1020. If the user has finished taking digital photographs as determined in a step 1025, the process ends at step 1030. Otherwise, steps 1010 through 1025 are repeated.
  • the communication time for one cycle depends upon the bus clock period and the data width. If bus 845 can
  • FIG 11 An alternative control architecture is shown in Figure 11 in which OIS algorithm module 805 is located within ISP 850. Similar to Figure 9, an autofocus algorithm module 940 in ISP 850 controls AF driver 830 in driver IC 810. Driver IC 810, gyroscope 710, imager 720, ISP 850 and MCU 855 all communicate using I C bus 845. Figure 12 shows the resulting control loops. OIS algorithm module 805 is again a simplified version in that the tracking filter is omitted and the intended motion of the camera approximated by high pass filtering 910 the pitch and yaw rates from gyroscope 710. ISP 850 controls both gyroscope 710 and driver IC 810. For illustration clarity, just a single combined channel is shown for OIS algorithm module 805.
  • the OIS data traffic begins in an initial step 1300 with ISP 850 as the I C bus master.
  • MCU 855 may act as the master.
  • gyroscope 710 may begin taking inertial measurements of camera movement and OIS driver 835 may command MEMS actuators 815 to transition from a parked to an active state as represented by step 1305.
  • ISP 850 then reads 6 bytes of gyroscopic data in a step 1310.
  • ISP 855 reads the current lens position as six bytes of data from translator 920 in a step 1315.
  • OIS algorithm module 805 can then determine the appropriate amount of actuation to address the camera jitter in a step 1320 whereupon ISP 855 may write to driver IC accordingly with a six-byte actuation command in a step 1325. If the user has finished taking digital photographs as determined in a step 1330, the process ends at step 1335. Otherwise, steps 1310 through 1325 are repeated.
  • step 1310 through 1325 depends upon the bus clock period and the data width. If bus 845 can accommodate 3 bytes in each clock cycle of 10 ⁇ , the cycle time ⁇ 8 ⁇ 0 ⁇ 8 * 3 * 6 * 8 + the algorithm calculation time for step 1320, which equals 1.44 ms + the algorithm calculation time.
  • locating OIS algorithm module 805 in IC driver 810 as discussed previously is faster in a master-slave bus protocol system.
  • locating OIS algorithm 805 in ISP 850 requires an extra step of data movement.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Studio Devices (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

Dans un exemple, un appareil de prise de vue comprend : une pluralité d'actionneurs à peigne électrostatiques à MEMS, chacun de ces actionneurs pouvant être commandé de manière à appliquer une force à au moins une lentille; et un module à algorithme de stabilisation d'image optique (OIS) pouvant fonctionner de manière à commander la pluralité d'actionneurs pour actionner au moins une lentille en réponse à un mouvement de l'appareil de prise de vue.
PCT/US2012/058082 2011-09-28 2012-09-28 Stabilisation d'image optique fondée sur des mems Ceased WO2013049688A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201610905935.3A CN106569310B (zh) 2011-09-28 2012-09-28 基于mems的光学图像稳定
CN201280047680.1A CN103842875B (zh) 2011-09-28 2012-09-28 基于mems的光学图像稳定

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US13/247,895 2011-09-28
US13/247,895 US9019390B2 (en) 2011-09-28 2011-09-28 Optical image stabilization using tangentially actuated MEMS devices
US13/247,906 US8855476B2 (en) 2011-09-28 2011-09-28 MEMS-based optical image stabilization
US13/247,906 2011-09-28

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WO2013049688A2 true WO2013049688A2 (fr) 2013-04-04
WO2013049688A3 WO2013049688A3 (fr) 2013-06-27

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CN106569310A (zh) 2017-04-19
CN103842875B (zh) 2016-11-09
TW201319628A (zh) 2013-05-16

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