CN113448053B - Piezoelectric type triaxial camera shooting driving device and driving method - Google Patents
Piezoelectric type triaxial camera shooting driving device and driving method Download PDFInfo
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- CN113448053B CN113448053B CN202110871187.2A CN202110871187A CN113448053B CN 113448053 B CN113448053 B CN 113448053B CN 202110871187 A CN202110871187 A CN 202110871187A CN 113448053 B CN113448053 B CN 113448053B
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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
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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
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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
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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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
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention relates to a piezoelectric triaxial camera shooting driving device and a driving method, which are technically characterized by comprising the following steps: a base; a protective shell; a frame unit including a first moving body, a second moving body, and a lens carrier; the piezoelectric driving unit comprises a first piezoelectric ceramic vibrator assembly for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly for driving the second moving body to move along the Y axis relative to the first moving body, and a third piezoelectric ceramic vibrator assembly for driving the lens carrier to move along the Z axis relative to the second moving body; the position sensing unit comprises an X-position sensing component, a Y-position sensing component and a Z-position sensing component. The invention solves the problem that the existing camera lens driving device cannot realize the functions of large displacement, large load and high speed focusing, realizes the functions of quick focusing and anti-shake of the lens, and has the advantages of small volume, large thrust, large displacement, no magnetic interference, simple structure and easy assembly.
Description
Technical Field
The present invention relates to an imaging lens driving device, and more particularly, to a piezoelectric triaxial imaging driving device and driving method suitable for a handheld imaging device.
Background
At present, a hand-held image pickup device, especially an image pickup driving device of a mobile phone, basically drives the whole lens by using a voice coil motor (VoiceCoilMotor, VCM), and the mode has the advantages of simple structure, mature technology, low cost and the like, but still has the following problems:
the application scene is basically limited to a main camera, a secondary camera, a wide angle, a micro-distance, a middle-low power long focus and the like with medium and low load and medium and low displacement, and is limited by a lens moving mode and a driving mode, so that large load and large displacement can not be realized to realize ultra-long distance shooting. With the urgent need for ultra-long-distance shooting, implementing the high-power continuous optical zoom function of the camera driving device has become a major problem to be solved by the present hand-held camera device, especially the camera driving device of a mobile phone.
Disclosure of Invention
The invention aims to provide a piezoelectric triaxial camera driving device and a driving method which are reasonable in structure and reliable in use, solve the problem that the existing camera lens driving device cannot realize large-displacement, large-load and high-speed focusing functions, realize the rapid focusing and anti-shake functions of a lens, and have the advantages of small volume, large thrust, large displacement, no magnetic interference, simple structure and easiness in assembly.
The technical scheme of the invention is as follows:
a piezoelectric triaxial camera driving device is technically characterized by comprising:
a base;
the protective shell is buckled with the base into a whole to form a cavity;
the frame unit is arranged in the cavity and comprises a first moving body, a second moving body arranged in the first moving body and a lens carrier arranged in the second moving body, and the first moving body is positioned in an annular space formed by the second moving body and the base;
the piezoelectric driving unit comprises a first piezoelectric ceramic vibrator assembly for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly for driving the second moving body to move along the Y axis relative to the first moving body, and a third piezoelectric ceramic vibrator assembly for driving the lens carrier to move along the Z axis relative to the second moving body;
the position sensing unit comprises an X-position sensing component corresponding to the first moving body, a Y-position sensing component corresponding to the second moving body and a Z-position sensing component corresponding to the lens carrier.
The piezoelectric triaxial camera shooting driving device is characterized in that the first piezoelectric ceramic vibrator component and the second piezoelectric ceramic vibrator component have the same structure and respectively comprise a bearing frame and piezoelectric ceramic vibrators arranged on the bearing frame, each piezoelectric ceramic vibrator comprises an elastomer and a piezoelectric ceramic piece fixed on the elastomer, and the corresponding ends of the bearing frame and the elastomer are connected with a plate spring together; the first piezoelectric ceramic vibrator component is positioned on an X-direction retaining wall of the base, a hollow groove corresponding to the bearing frame is formed in the X-direction retaining wall, two sides of the hollow groove are fixedly connected with the plate springs, and an X-direction friction plate tightly contacted with an elastic body of the first piezoelectric ceramic vibrator component is slotted and fixed on the side wall of the first moving body; the second piezoelectric ceramic vibrator assembly is positioned on the Y-direction side wall of the first moving body, a hollow groove corresponding to the bearing frame is formed in the Y-direction side wall, two sides of the hollow groove are fixedly connected with the plate springs, and a Y-direction friction plate closely contacted with the elastic body of the second piezoelectric ceramic vibrator assembly is slotted and fixed on the side wall of the second moving body; the third piezoelectric ceramic vibrator assembly comprises a cantilever type piezoelectric ceramic body connected with the inner side of the second moving body, a Z-direction driving friction block arranged at the tail end of the cantilever type piezoelectric ceramic body, and a Z-direction driven friction block fixed with the lens carrier and in close contact with the driving friction block.
In the piezoelectric triaxial imaging driving device, the elastic body is provided with the comb-shaped bulge structures facing the sides of the X-direction friction plate and the Y-direction friction plate, and the comb-shaped bulge structures are in close contact with the corresponding X-direction friction plate or Y-direction friction plate.
The piezoelectric triaxial camera driving device comprises a base plate and a retaining wall, wherein a metal material belt for increasing strength, taking electricity and transmitting signals is arranged in the base plate and the retaining wall, a conductive terminal leading-out area connected with the metal material belt is arranged at the edge of the base plate, a plurality of conductive connecting parts connected with the metal material belt are arranged on the top surface of the retaining wall, an electrode connecting part I corresponding to a first piezoelectric ceramic vibrator assembly is arranged on the retaining wall of the base plate, an electrode connecting part II corresponding to a second piezoelectric ceramic vibrator assembly is arranged on the side wall of the first moving body, signal connecting ends are respectively arranged on the top surfaces of the first moving body and the second moving body, and each signal connecting end is connected with the conductive connecting part of the top surface of the retaining wall by using a flexible conductor.
The piezoelectric type triaxial camera shooting driving device comprises an X-position sensing assembly, a Y-position sensing assembly and a Z-position sensing assembly, wherein the X-position sensing assembly, the Y-position sensing assembly and the Z-position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor, two horizontal positioning grooves for embedding the signal receivers of the X-position sensing assembly and the Y-position sensing assembly are formed in the upper surface of a bottom plate of a base, a vertical positioning groove for embedding the signal receiver of the Z-position sensing assembly is formed in the inner side surface of a second moving body, conductive connecting parts are respectively arranged at the bottoms of the horizontal positioning groove and the vertical positioning groove, a fixing groove I for embedding the position sensor of the X-position sensing assembly is formed in the bottom surface of a first moving body, a fixing groove II for embedding the position sensor of the Y-position sensing assembly is formed in the bottom surface of the second moving body, and a fixing groove III for embedding the position sensor of the Z-position sensing assembly is formed in the outer side surface of a lens carrier.
In the piezoelectric triaxial camera shooting driving device, a plurality of pre-pressing assemblies are arranged in a nesting gap between the second moving body and the lens carrier and surround the center of the lens carrier, each pre-pressing assembly consists of a pre-pressing spring piece and balls which are longitudinally arranged, each pre-pressing spring piece consists of two fixing parts which are connected with the outer side wall of the lens carrier and an acting part which is arranged between the two fixing parts, the inner side wall of the second moving body is provided with a longitudinal mounting groove corresponding to the balls, the balls are used for propping the acting part of the pre-pressing spring piece in the horizontal direction and can generate Z-direction relative displacement with the acting part, and the pre-pressing assemblies are used for providing motion guiding support for the second moving body and the lens carrier and providing pre-pressing force for the lens carrier and the third piezoelectric ceramic vibrator assembly;
or a pre-pressing component is additionally arranged between the second moving body and the lens carrier and is a C-shaped metal spring piece, the C-shaped metal spring piece is fixed at one end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component, which is close to the second moving body, and the opening side of the C-shaped metal spring piece is fixed with the pressure of the second moving body to provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component;
or a pre-pressing component is arranged in the side wall of the second moving body and comprises a U-shaped fixing frame and a spring, the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component is transversely arranged in the U-shaped fixing frame, one end of the spring is exposed, one end of the spring is connected with the U-shaped fixing frame, one end of the spring is connected with the bottom of a spring fixing groove of the second moving body, and the U-shaped fixing frame and the spring provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component;
or be equipped with a pre-compaction subassembly and this pre-compaction subassembly includes the punching press leaf spring in the lateral wall of second mobile body, the punching press leaf spring is several style of calligraphy structures, comprises elastic metal material, be equipped with the fixed slot that corresponds the punching press leaf spring on the lateral wall of second mobile body, the cantilever type piezoceramics body of third piezoceramics oscillator subassembly is transversely arranged in the several style of calligraphy structures of punching press leaf spring, and one end exposes, and the upper and lower grip surface of punching press leaf spring provides elasticity precompaction for third piezoceramics oscillator subassembly.
In the piezoelectric triaxial imaging driving device, four corners of the upper surface of the bottom plate of the base are respectively provided with an X-direction guide groove i, the bottom of the first moving body is provided with an X-direction guide groove ii corresponding to the X-direction guide groove i, the X-direction guide grooves i and ii are correspondingly formed into an X-direction guide track for placing balls, the outer side wall of the top of the first moving body is provided with an X-direction guide groove iii, and an X-direction guide track for placing balls is formed between the X-direction guide groove iii and the inner side wall of the retaining wall of the base; the bottom upper surface of the first moving body is additionally provided with a Y-direction guide groove I, the bottom surface of the second moving body is provided with a Y-direction guide groove II corresponding to the Y-direction guide groove I, the Y-direction guide grooves I and II are correspondingly formed into a Y-direction guide track for placing balls, the outer side wall of the top of the second moving body is provided with a Y-direction guide groove III, and a Y-direction guide track for placing balls is formed between the Y-direction guide groove III and the inner side wall of the first moving body.
According to the piezoelectric triaxial camera shooting driving device, the rectangular groove for clamping the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is formed in the inner side wall of the second moving body, and the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is fixed with the rectangular groove.
According to the piezoelectric triaxial camera shooting driving device, the gasket is additionally arranged on the top surface of the second moving body, the plane of the upper end of the longitudinal installation groove of the corresponding ball of the second moving body is higher than the position of the signal connection end of the second moving body, the plane of the upper end of the longitudinal installation groove is a bearing surface of the gasket, and the limit of the ball in the longitudinal installation groove is realized by the gasket.
The driving method of the piezoelectric triaxial camera shooting driving device has the technical key points that: the method comprises the steps that a high-frequency alternating current sinusoidal electric signal is loaded on a first piezoelectric ceramic vibrator assembly fixed on a base, vibration generated by the first piezoelectric ceramic vibrator assembly drives a first moving body to move in the X-axis direction in the base, a position sensor embedded at the bottom of the first moving body and a signal receiver on the upper surface of the base monitor the movement condition of the first moving body in real time while the first moving body moves, and a position compensation signal is sent to a corresponding control circuit of the first piezoelectric ceramic vibrator assembly to control the first moving body to move and adjust corresponding position precision, so that closed-loop control is realized, and the process is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on a second piezoelectric ceramic vibrator assembly fixed on the side surface of the first moving body, the vibration generated by the second piezoelectric ceramic vibrator assembly drives the second moving body to move in the Y-axis direction in the first moving body, a position sensor embedded at the bottom of the second moving body and a signal receiver on the upper surface of the base monitor the movement condition of the second moving body in real time while the second moving body moves, and a position compensation signal is sent to a corresponding control circuit of the second piezoelectric ceramic vibrator assembly to control the movement of the second moving body to adjust corresponding position precision so as to realize closed-loop control, and the operation is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on a third piezoelectric ceramic vibrator assembly fixed in a second moving body, vibration generated by the third piezoelectric ceramic vibrator assembly drives a lens carrier to move in the second moving body along the Z-axis direction, a focusing function is achieved, a position sensor embedded in the side face of the lens carrier and a signal receiver embedded in the side face of the second moving body monitor the movement condition of the lens carrier in real time while the lens carrier moves, and a position compensation signal is sent to the third piezoelectric ceramic vibrator assembly to control the movement of the lens carrier to adjust corresponding position precision, closed-loop control is achieved, and the operation is repeated until the preset precision is reached.
The beneficial effects of the invention are as follows:
the invention applies the piezoelectric ceramic technology to the camera shooting driving device, utilizes the third piezoelectric ceramic vibrator assembly to drive the lens carrier to move along the Z axis so as to realize the basic focusing function, and simultaneously utilizes the first piezoelectric ceramic vibrator assembly to drive the first moving body (to drive the second moving body and the lens carrier) to move along the X axis relative to the base, and utilizes the second piezoelectric ceramic vibrator assembly to drive the second moving body to move along the Y axis relative to the first moving body so as to realize the anti-shake function of the lens. Through the cooperation of three drive assembly in the piezoelectricity drive unit to carrier, first mobile body, the mode of second mobile body collaborative motion adjust image parameter, replace traditional voice coil motor structure, realize high-speed function of focusing, have simple structure, small, no magnetic interference, thrust are big, the displacement is big, response speed is fast, positioning accuracy is high, advantages such as firm in structure, easy equipment.
Drawings
FIG. 1 is a schematic structural view of embodiment 1 of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the internal structure of the present invention (with the spacer and lens carrier removed);
FIG. 4 is a schematic view of the structure of the base of the present invention;
FIG. 5 is a schematic view of the structure of the first mobile body of the present invention;
fig. 6 is a schematic structural view of a second mobile body according to the present invention;
FIG. 7 is a schematic view of a second movable body according to another aspect of the present invention;
FIG. 8 is a schematic view of the structure of a gasket of the present invention;
FIG. 9 is a schematic view of a lens carrier according to the present invention;
FIG. 10 is a schematic structural view of a third piezoelectric ceramic vibrator assembly according to the present invention;
FIG. 11 is a schematic structural view of a first piezoelectric ceramic vibrator assembly according to the present invention;
fig. 12 is a schematic structural diagram of a pre-pressing spring piece in embodiment 1 of the present invention;
FIG. 13 is a schematic structural view of the protective case of the present invention;
FIG. 14 is a schematic view of the structure of the flexible electrical conductor of the present invention;
FIG. 15 is a schematic structural view of a precompression assembly of embodiment 2 of the present invention;
FIG. 16 is a schematic view showing the structure of a pre-pressing assembly of embodiment 3 of the present invention;
fig. 17 is a schematic structural view of a pre-pressing assembly of embodiment 4 of the present invention.
In the figure: 1. base, 1001. Horizontal positioning slot, 1002. X-direction guide slot I, 2. First moving body, 2001. X-direction guide slot III, 2002. X-direction guide slot II, 2003. Y-direction guide slot I, 3. Second moving body, 3001. Y-direction guide slot II, 3002. Y-direction guide slot III, 3003. Vertical positioning slot, 3004. Longitudinal mounting slot, 3005. Fixed slot II, 4. Spacer, 5. Lens carrier, 5001. Fixed slot III, 6. Signal connection end, 7. Flexible conductor, 8. Ball, 9. First piezoelectric ceramic vibrator assembly, 9001. Leaf spring, 9002. Bearing frame, 9003. Piezoelectric ceramic vibrator, 9004. X-direction friction plate, 10. Second piezoelectric ceramic vibrator assembly, 11. Ball, 12. Third piezoelectric ceramic vibrator assembly, 1201. Cantilever piezoelectric ceramic body, 1202. Z-direction active friction block, 1203. Z-direction passive friction block, 13. Pre-compression, 1301 fixing portion, 1302. Action portion, 14. Electrode connection portion I, 15. Electrode connection portion 16, 17. Leaf spring, 17. Spring shell, 19. Spring case, and spring case 20.
Detailed Description
The invention will be described in detail with reference to the drawings.
As shown in fig. 1 to 14, the piezoelectric triaxial imaging driving device includes a base 1, a protective case 16, a frame unit, a piezoelectric driving unit, and a position sensing unit.
The base 1 plays a supporting and limiting role. The protective shell 16 is buckled with the base 1 into a whole to form a cavity. The frame unit is arranged in the cavity and comprises a first moving body 2, a second moving body 3 arranged in the first moving body 2 and a lens carrier 5 arranged in the second moving body 3, wherein the first moving body 2 is arranged in an annular space formed by the second moving body 3 and the base 1. The piezoelectric driving unit includes a first piezoelectric ceramic vibrator assembly 9 for driving the first moving body 2 to move along the X-axis relative to the base 1, a second piezoelectric ceramic vibrator assembly 10 for driving the second moving body 3 to move along the Y-axis relative to the first moving body 2, and a third piezoelectric ceramic vibrator assembly 12 for driving the lens carrier 5 to move along the Z-axis relative to the second moving body 3. The position sensing unit comprises an X-position sensing component corresponding to the first moving body, a Y-position sensing component corresponding to the second moving body and a Z-position sensing component corresponding to the lens carrier.
In this embodiment, the first piezoelectric ceramic vibrator assembly 9 and the second piezoelectric ceramic vibrator assembly 10 have the same structure. Taking the first piezoelectric ceramic vibrator assembly 9 as an example, it includes a carrier frame 9002 and a piezoelectric ceramic vibrator 9003 provided on the carrier frame 9002. The piezoelectric ceramic vibrator 9003 comprises an elastomer and a piezoelectric ceramic piece fixed on the elastomer, and the corresponding ends of the bearing frame 9002 and the elastomer 9003 are jointly connected with a plate spring 9001. The first piezoelectric ceramic vibrator assembly 9 is located on an X-direction retaining wall of the base 1, a hollow groove corresponding to the bearing frame 9002 is formed in the X-direction retaining wall, two sides of the hollow groove are fixedly connected with the plate springs 9001, and an X-direction friction plate 9004 in close contact with an elastic body of the first piezoelectric ceramic vibrator assembly 9 is slotted and fixed on the side wall of the first movable body 2. The second piezoelectric ceramic vibrator assembly 10 is located on a Y-direction side wall of the first moving body 2, a hollow groove corresponding to the bearing frame is formed in the Y-direction side wall, two sides of the hollow groove are fixedly connected with the leaf springs, and a groove is formed in the side wall of the second moving body and is fixedly connected with a Y-direction friction plate closely contacted with an elastomer of the second piezoelectric ceramic vibrator assembly 10. The sides of the elastic body facing the X-direction friction plate 9004 and the Y-direction friction plate are provided with comb-shaped bulge structures, and the comb-shaped bulge structures are in close contact with the corresponding X-direction friction plate 9004 or Y-direction friction plate. The third piezoelectric ceramic vibrator assembly 12 includes a cantilever type piezoelectric ceramic body 1201 connected to the inner side of the second movable body 3, a Z-direction active friction block 1202 disposed at the end of the cantilever type piezoelectric ceramic body 1201, and a Z-direction passive friction block 1203 fixed to the lens carrier 5 and in close contact with the Z-direction active friction block 1202.
The piezoelectric ceramic plates of the first piezoelectric ceramic vibrator assembly 9 and the second piezoelectric ceramic vibrator assembly 10 are respectively provided with a plurality of polarization subareas, the polarization directions of adjacent polarization subareas are the same or opposite, independent inner electrodes are arranged on the upper surfaces of the subareas, the inner electrodes on the upper surfaces of the subareas with the same polarization directions and the corresponding outer electrodes at the end parts of the upper surfaces of the elastic bodies form an independent serial circuit, and the upper surfaces of the piezoelectric ceramic plates are divided into two independent serial circuits; the back of the piezoelectric ceramic piece is provided with a whole internal electrode or independent internal electrodes corresponding to each polarized region, and all the internal electrodes on the back and the end parts of the upper surface of the elastic body correspond to the external electrodes to form an independent serial circuit, so that the first piezoelectric ceramic vibrator component and the second piezoelectric ceramic vibrator component are respectively provided with three independent serial circuits to be electrically connected with an external control circuit. The cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator assembly 12 has four polarized regions in a shape of a Chinese character 'tian', the polarized directions of adjacent polarized regions are opposite, the electrodes on one surface of the regions in the same polarized direction and the corresponding external electrodes form an independent series circuit, and the internal electrodes on the other surface of the four polarized regions and the corresponding external electrodes form an independent series circuit, and three independent series circuits are electrically connected with an external control circuit.
The base 1 is made of insulating materials and comprises a bottom plate and a retaining wall, metal material strips with the functions of increasing strength, taking electricity and transmitting signals are arranged in the bottom plate and the retaining wall, conductive terminal lead-out areas connected with the metal material strips are arranged at the edges of the bottom plate, and a plurality of conductive connecting parts connected with the metal material strips, namely signal connecting ends 6, are arranged on the top surface of the retaining wall. The metal material belt is of a plurality of discontinuous structures, and the material is one of metals, such as iron, copper alloy, stainless steel and the like. The retaining wall of the base 1 is provided with an electrode connecting portion I14 corresponding to the first piezoelectric ceramic vibrator assembly 9, the side wall of the first moving body 2 is provided with an electrode connecting portion II 15 corresponding to the second piezoelectric ceramic vibrator assembly 10, the top surfaces of the first moving body 2 and the second moving body 3 are respectively provided with a signal connecting end 6, and each signal connecting end 6 is connected with the signal connecting end 6 on the top surface of the retaining wall by utilizing a flexible conductor 7.
The X-position sensing assembly, the Y-position sensing assembly and the Z-position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor. The bottom plate upper surface of base 1 is equipped with two horizontal constant head tanks 1001 that are used for inlaying the signal receiver of X position sensing subassembly, Y position sensing subassembly, the medial surface of second moving body 3 is equipped with a vertical constant head tank 3003 that is used for inlaying the signal receiver of Z position sensing subassembly, horizontal constant head tank 1001 and vertical constant head tank 3003's tank bottom are equipped with conductive connection portion respectively, the bottom surface of first moving body 2 is equipped with the fixed slot I that is used for inlaying the position sensor of X position sensing subassembly, the bottom surface of second moving body 3 is equipped with the fixed slot II 3005 that is used for inlaying the position sensor of Y position sensing subassembly, the lateral surface of lens carrier 5 is equipped with a fixed slot III 1 that is used for inlaying the position sensor of Z position sensing subassembly.
The second moving body 3 and the lens carrier 5 are provided with a plurality of pre-pressing components which are arranged around the center of the lens carrier 5 in a nesting gap, each pre-pressing component consists of a pre-pressing spring piece 13 and a longitudinally arranged ball 11, each pre-pressing spring piece 13 consists of two fixing parts 1301 which are connected with the outer side wall of the lens carrier 5 and an acting part 1302 which is arranged between the two fixing parts 1301, the inner side wall of the second moving body 3 is provided with a longitudinal mounting groove 3004 corresponding to the ball 11, the ball 11 horizontally presses the acting part 1302 of the pre-pressing spring piece 13 and can generate Z-direction relative displacement with the acting part, and the pre-pressing components are used for providing motion guiding support for the second moving body 3 and the lens carrier 5 and providing pre-pressing force for the lens carrier 5 and the third piezoelectric ceramic vibrator component 12. The inner side wall of the second moving body 3 is provided with a rectangular groove for clamping the fixed end of the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator assembly 12, and the fixed end of the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator assembly is bonded and fixed with the rectangular groove through glue. The top surface of the second moving body 3 is further provided with a gasket 4, the plane of the upper end of the longitudinal installation groove 3004 of the corresponding ball of the second moving body 3 is higher than the position of the signal connection end 6 of the second moving body 3, the plane of the upper end of the longitudinal installation groove 3004 is a bearing surface of the gasket 4, and the gasket 4 is used for limiting the ball 11 in the longitudinal installation groove 3004.
The four corners of the upper surface of the bottom plate of the base 1 are respectively provided with an X-direction guiding groove I1002, the bottom of the first moving body 2 is provided with an X-direction guiding groove II 2002 corresponding to the X-direction guiding groove I1002, and the X-direction guiding groove I1002 and the X-direction guiding groove II 2002 correspond to form an X-direction guiding track for placing balls. An X-direction guide groove iii 2001 is formed in the top outer side wall of the first moving body 2, and an X-direction guide track for placing balls is formed between the X-direction guide groove iii 2001 and the inner side wall of the retaining wall of the base 1. The bottom upper surface of the first moving body 2 is further provided with a Y-guiding groove i 2003, the bottom surface of the second moving body 3 is provided with a Y-guiding groove ii 3001 corresponding to the Y-guiding groove i 2003, the Y-guiding grooves i 2003 and ii 3001 are correspondingly formed with a Y-guiding track for placing balls, the top outer side wall of the second moving body 3 is provided with a Y-guiding groove iii 3002, and a Y-guiding track for placing balls 8 is formed between the Y-guiding groove iii 3002 and the inner side wall of the first moving body 2.
The invention relates to a driving method of a piezoelectric triaxial camera shooting driving device, which specifically comprises the following steps: the high-frequency alternating current sinusoidal electric signal is loaded on a first piezoelectric ceramic vibrator assembly 9 fixed on a base, vibration generated by the first piezoelectric ceramic vibrator assembly 9 drives a first movable body 2 to move in the X-axis direction in the base 1, a position sensor embedded at the bottom of the first movable body 2 and a signal receiver on the upper surface of the base 1 monitor the movement condition of the first movable body 2 in real time while the first movable body 2 moves, and a position compensation signal is sent to a corresponding control circuit of the first piezoelectric ceramic vibrator assembly 9 to control the movement of the first movable body 2 to adjust corresponding position precision so as to realize closed-loop control, and the operation is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on the second piezoelectric ceramic vibrator assembly 10 fixed on the side surface of the first moving body 2, the vibration generated by the second piezoelectric ceramic vibrator assembly 10 drives the second moving body 3 to move along the Y-axis direction in the first moving body 2, the position sensor embedded at the bottom of the second moving body 3 and the signal receiver on the upper surface of the base 1 monitor the movement condition of the second moving body 3 in real time while the second moving body 3 moves, and a position compensation signal is sent to a corresponding control circuit of the second piezoelectric ceramic vibrator assembly 10 to control the movement of the second moving body 3 to adjust the corresponding position precision so as to realize closed-loop control, and the operation is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on the third piezoelectric ceramic vibrator assembly 12 fixed in the second moving body 3, vibration generated by the third piezoelectric ceramic vibrator assembly 12 drives the lens carrier 5 to move in the second moving body 3 along the Z-axis direction, a focusing function is achieved, the lens carrier 5 moves, meanwhile, a position sensor embedded on the side surface of the lens carrier 5 and a signal receiver embedded on the side surface of the second moving body 3 monitor the movement condition of the lens carrier 5 in real time, and a position compensation signal is sent to the third piezoelectric ceramic vibrator assembly 12 to control the movement of the lens carrier 5 to adjust corresponding position precision, closed-loop control is achieved, and the operation is repeated until the preset precision is reached.
Example 2
In this embodiment, as shown in fig. 15, the third piezoelectric ceramic vibrator assembly 12 is different from embodiment 1 in the pre-pressing assembly.
That is, a pre-pressing component is further disposed between the second moving body 3 and the lens carrier 5, and the pre-pressing component is a C-shaped metal spring 17, the C-shaped metal spring 17 is fixed to one end of the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator component 12, which is close to the second moving body 3, and an opening side of the C-shaped metal spring 17 is fixed with the pressure of the second moving body 3, so as to provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component 12.
Otherwise, the same as in example 1 was conducted.
Example 3
In this embodiment, as shown in fig. 16, the third piezoelectric ceramic vibrator assembly 12 is different from embodiment 1 in the pre-pressing assembly.
A pre-pressing component is arranged in the side wall of the second moving body 3 and comprises a U-shaped fixing frame 18 and a spring 19, the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator component 12 is transversely arranged in the U-shaped fixing frame 18, one end of the spring 19 is externally connected with the active friction block 1202, one end of the spring 19 is connected with the side wall of the U-shaped fixing frame 18, one end of the spring 19 is connected with the bottom of a fixing groove of the spring 19 of the second moving body 3, and the U-shaped fixing frame 18 and the spring 19 provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component 12;
otherwise, the same as in example 1 was conducted.
Example 4
In this embodiment, as shown in fig. 17, the third piezoelectric ceramic vibrator assembly 12 is different from embodiment 1 in the pre-pressing assembly.
The side wall of the second moving body 3 is provided with a pre-pressing component which comprises a stamping plate spring 20, the stamping plate spring 20 is of a shape like a Chinese character 'ji', and is made of elastic metal materials, the side wall of the second moving body 3 is provided with a fixed groove corresponding to the stamping plate spring 20, the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator component is transversely arranged in the shape like a Chinese character 'ji' of the stamping plate spring 20, one end of the cantilever type piezoelectric ceramic body 1201 is exposed and connected with the driving friction block 1202, and the upper clamping surface and the lower clamping surface of the stamping plate spring 20 provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component 12.
Otherwise, the same as in example 1 was conducted.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (6)
1. A piezoelectric triaxial imaging driving device, comprising:
a base;
the protective shell is buckled with the base into a whole to form a cavity;
the frame unit is arranged in the cavity and comprises a first moving body, a second moving body arranged in the first moving body and a lens carrier arranged in the second moving body, and the first moving body is positioned in an annular space formed by the second moving body and the base;
the piezoelectric driving unit comprises a first piezoelectric ceramic vibrator assembly for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly for driving the second moving body to move along the Y axis relative to the first moving body, and a third piezoelectric ceramic vibrator assembly for driving the lens carrier to move along the Z axis relative to the second moving body;
the position sensing unit comprises an X-position sensing component corresponding to the first moving body, a Y-position sensing component corresponding to the second moving body and a Z-position sensing component corresponding to the lens carrier;
the first piezoelectric ceramic vibrator assembly and the second piezoelectric ceramic vibrator assembly have the same structure and respectively comprise a bearing frame and piezoelectric ceramic vibrators arranged on the bearing frame, wherein each piezoelectric ceramic vibrator comprises an elastomer and a piezoelectric ceramic piece fixed on the elastomer, and the corresponding ends of the bearing frame and the elastomer are connected with a plate spring together; the first piezoelectric ceramic vibrator component is positioned on an X-direction retaining wall of the base, a hollow groove corresponding to the bearing frame is formed in the X-direction retaining wall, two sides of the hollow groove are fixedly connected with the plate springs, and an X-direction friction plate tightly contacted with an elastic body of the first piezoelectric ceramic vibrator component is slotted and fixed on the side wall of the first moving body; the second piezoelectric ceramic vibrator assembly is positioned on the Y-direction side wall of the first moving body, a hollow groove corresponding to the bearing frame is formed in the Y-direction side wall, two sides of the hollow groove are fixedly connected with the plate springs, and a Y-direction friction plate closely contacted with the elastic body of the second piezoelectric ceramic vibrator assembly is slotted and fixed on the side wall of the second moving body; the third piezoelectric ceramic vibrator assembly comprises a cantilever type piezoelectric ceramic body connected with the inner side of the second moving body, a Z-direction driving friction block arranged at the tail end of the cantilever type piezoelectric ceramic body, and a Z-direction driven friction block fixed with the lens carrier and closely contacted with the driving friction block; the elastic body is provided with comb-shaped bulge structures on the side faces facing the X-direction friction plate and the Y-direction friction plate, and the comb-shaped bulge structures are in close contact with the corresponding X-direction friction plate or Y-direction friction plate;
the second moving body and the lens carrier are provided with a plurality of prepressing assemblies which are arranged around the center of the lens carrier in a nesting gap, each prepressing assembly consists of a prepressing spring piece and longitudinally arranged balls, each prepressing spring piece consists of two fixing parts which are used for being connected with the outer side wall of the lens carrier and an acting part which is arranged between the two fixing parts, the inner side wall of the second moving body is provided with a longitudinal mounting groove corresponding to the balls, the balls are used for propping the acting part of the prepressing spring piece in the horizontal direction and can generate Z-direction relative displacement with the acting part, and the prepressing assemblies are used for providing motion guiding support for the second moving body and the lens carrier and providing prepressing force for the lens carrier and the third piezoelectric ceramic vibrator assembly; or a pre-pressing component is additionally arranged between the second moving body and the lens carrier and is a C-shaped metal spring piece, the C-shaped metal spring piece is fixed at one end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component, which is close to the second moving body, and the opening side of the C-shaped metal spring piece is fixed with the pressure of the second moving body to provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component; or a pre-pressing component is arranged in the side wall of the second moving body and comprises a U-shaped fixing frame and a spring, the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component is transversely arranged in the U-shaped fixing frame, one end of the spring is exposed, one end of the spring is connected with the U-shaped fixing frame, one end of the spring is connected with the bottom of a spring fixing groove of the second moving body, and the U-shaped fixing frame and the spring provide elastic pre-pressing force for the third piezoelectric ceramic vibrator component; or a prepressing assembly is arranged in the side wall of the second moving body and comprises a stamping plate spring, the stamping plate spring is of a shape like a Chinese character 'ji', and is made of elastic metal materials, a fixing groove corresponding to the stamping plate spring is arranged on the side wall of the second moving body, the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is transversely arranged in the shape like a Chinese character 'ji', one end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is exposed, and the upper clamping surface and the lower clamping surface of the stamping plate spring provide elastic prepressing force for the third piezoelectric ceramic vibrator assembly;
the four corners of the upper surface of the bottom plate of the base are respectively provided with an X-direction guide groove I, the bottom of the first moving body is provided with an X-direction guide groove II corresponding to the X-direction guide groove I, the X-direction guide grooves I and II are correspondingly formed into an X-direction guide track for placing balls, the outer side wall of the top of the first moving body is provided with an X-direction guide groove III, and an X-direction guide track for placing balls is formed between the X-direction guide groove III and the inner side wall of the retaining wall of the base; the bottom upper surface of the first moving body is additionally provided with a Y-direction guide groove I, the bottom surface of the second moving body is provided with a Y-direction guide groove II corresponding to the Y-direction guide groove I, the Y-direction guide grooves I and II are correspondingly formed into a Y-direction guide track for placing balls, the outer side wall of the top of the second moving body is provided with a Y-direction guide groove III, and a Y-direction guide track for placing balls is formed between the Y-direction guide groove III and the inner side wall of the first moving body.
2. The piezoelectric triaxial imaging driving device according to claim 1, characterized in that: the base is made of insulating materials and comprises a bottom plate and a retaining wall, the bottom plate and the retaining wall are internally provided with metal material strips with the functions of increasing strength, electricity taking and signal transmission, the edge of the bottom plate is provided with a conductive terminal leading-out area connected with the metal material strips, the top surface of the retaining wall is provided with a plurality of conductive connecting parts connected with the metal material strips, the retaining wall of the base is provided with an electrode connecting part I corresponding to a first piezoelectric ceramic vibrator assembly, the side wall of the first moving body is provided with an electrode connecting part II corresponding to a second piezoelectric ceramic vibrator assembly, the top surfaces of the first moving body and the second moving body are respectively provided with signal connecting ends, and each signal connecting end is connected with the conductive connecting part of the top surface of the retaining wall by utilizing a flexible conductor.
3. The piezoelectric triaxial imaging driving device according to claim 1, characterized in that: the X-position sensing assembly, the Y-position sensing assembly and the Z-position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor, two horizontal positioning grooves for embedding the signal receiver of the X-position sensing assembly and the signal receiver of the Y-position sensing assembly are formed in the upper surface of a bottom plate of the base, a vertical positioning groove for embedding the signal receiver of the Z-position sensing assembly is formed in the inner side surface of the second moving body, conductive connecting parts are respectively arranged at the bottoms of the horizontal positioning groove and the vertical positioning groove, a fixing groove I for embedding the position sensor of the X-position sensing assembly is formed in the bottom surface of the first moving body, a fixing groove II for embedding the position sensor of the Y-position sensing assembly is formed in the bottom surface of the second moving body, and a fixing groove III for embedding the position sensor of the Z-position sensing assembly is formed in the outer side surface of the lens carrier.
4. The piezoelectric triaxial imaging driving device according to claim 1, characterized in that: the inner side wall of the second moving body is provided with a rectangular groove for clamping the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly, and the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is fixed with the rectangular groove.
5. The piezoelectric triaxial imaging driving device according to claim 1, characterized in that: the top surface of the second moving body is additionally provided with a gasket, the plane of the upper end of the longitudinal installation groove of the corresponding ball of the second moving body is higher than the position of the signal connection end of the second moving body, the plane of the upper end of the longitudinal installation groove is a bearing surface of the gasket, and the limit of the ball in the longitudinal installation groove is realized by the gasket.
6. A driving method of the piezoelectric triaxial imaging driving device according to claim 1 or 2 or 3 or 4 or 5, characterized in that: the method comprises the steps that a high-frequency alternating current sinusoidal electric signal is loaded on a first piezoelectric ceramic vibrator assembly fixed on a base, vibration generated by the first piezoelectric ceramic vibrator assembly drives a first moving body to move in the X-axis direction in the base, a position sensor embedded at the bottom of the first moving body and a signal receiver on the upper surface of the base monitor the movement condition of the first moving body in real time while the first moving body moves, and a position compensation signal is sent to a corresponding control circuit of the first piezoelectric ceramic vibrator assembly to control the first moving body to move and adjust corresponding position precision, so that closed-loop control is realized, and the process is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on a second piezoelectric ceramic vibrator assembly fixed on the side surface of the first moving body, the vibration generated by the second piezoelectric ceramic vibrator assembly drives the second moving body to move in the Y-axis direction in the first moving body, a position sensor embedded at the bottom of the second moving body and a signal receiver on the upper surface of the base monitor the movement condition of the second moving body in real time while the second moving body moves, and a position compensation signal is sent to a corresponding control circuit of the second piezoelectric ceramic vibrator assembly to control the movement of the second moving body to adjust corresponding position precision so as to realize closed-loop control, and the operation is repeated until the preset precision is reached; the high-frequency alternating current sinusoidal electric signal is loaded on a third piezoelectric ceramic vibrator assembly fixed in a second moving body, vibration generated by the third piezoelectric ceramic vibrator assembly drives a lens carrier to move in the second moving body along the Z-axis direction to realize a focusing function, a ball presses an acting part of a pre-pressing spring sheet in the horizontal direction and can generate Z-direction relative displacement with the acting part, the pre-pressing assembly is used for providing motion guiding support for the second moving body and the lens carrier and providing pre-pressing force for the lens carrier and the third piezoelectric ceramic vibrator assembly, a position sensor embedded on the side surface of the lens carrier and a signal receiver embedded on the side surface of the second moving body monitor the motion condition of the lens carrier in real time when the lens carrier moves, and send a position compensation signal to the third piezoelectric ceramic vibrator assembly to control the movement of the lens carrier to adjust corresponding position precision so as to realize closed-loop control, and the pre-pressing assembly is repeatedly performed until the preset precision is reached.
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| JP3523488B2 (en) * | 1998-03-31 | 2004-04-26 | 京セラ株式会社 | Ultrasonic linear motor and driving device using the same |
| JP3939048B2 (en) * | 1999-05-17 | 2007-06-27 | セイコーインスツル株式会社 | Piezoelectric actuator |
| JP4981427B2 (en) * | 2006-12-08 | 2012-07-18 | キヤノン株式会社 | Vibration drive device |
| KR20080104785A (en) * | 2007-05-29 | 2008-12-03 | 삼성전기주식회사 | A piezoelectric actuator and device for lens transfer having the same |
| JP6717100B2 (en) * | 2016-07-29 | 2020-07-01 | Tdk株式会社 | Lens drive |
| JP7009055B2 (en) * | 2016-10-26 | 2022-01-25 | Tdk株式会社 | Lens drive device |
| CN110456474A (en) * | 2019-08-12 | 2019-11-15 | 重庆睿恩光电子有限责任公司 | The lens driver and camera apparatus of auto-focusing piezoelectricity USM |
| CN111399163B (en) * | 2020-03-17 | 2024-05-21 | 睿恩光电有限责任公司 | Lens driving device with optical anti-shake function, camera device and electronic equipment |
| CN111474671A (en) * | 2020-04-12 | 2020-07-31 | 睿恩光电有限责任公司 | Anti-shake and focusing lens drive device, camera device, and electronic apparatus |
| CN212207814U (en) * | 2020-06-11 | 2020-12-22 | 东莞市亚登电子有限公司 | Lens driving device |
| CN212935798U (en) * | 2020-09-24 | 2021-04-09 | 辽宁中蓝光电科技有限公司 | Piezoelectric linear driver for driving camera lens |
| CN112492175B (en) * | 2020-12-08 | 2022-06-10 | 维沃移动通信有限公司 | Camera shooting module |
| CN113163089A (en) * | 2021-04-20 | 2021-07-23 | 河源友华微机电科技有限公司 | Image sensing module and camera using same |
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Denomination of invention: A piezoelectric three-axis camera driving device and driving method Effective date of registration: 20231228 Granted publication date: 20230620 Pledgee: China Construction Bank Corporation Panjin branch Pledgor: Liaoning Zhonglan Photoelectric Technology Co.,Ltd. Registration number: Y2023210000359 |