CN113448053A - Piezoelectric type triaxial camera driving device and driving method - Google Patents
Piezoelectric type triaxial camera driving device and driving method Download PDFInfo
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- CN113448053A CN113448053A CN202110871187.2A CN202110871187A CN113448053A CN 113448053 A CN113448053 A CN 113448053A CN 202110871187 A CN202110871187 A CN 202110871187A CN 113448053 A CN113448053 A CN 113448053A
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- 238000003825 pressing Methods 0.000 claims description 8
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- 238000012544 monitoring process Methods 0.000 claims description 5
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention relates to a piezoelectric type triaxial camera driving device and a driving method, and the technical key points are as follows: 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 used for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly used 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 used 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 assembly, a Y-position sensing assembly and a Z-position sensing assembly. The invention solves the problem that the existing camera lens driving device can not realize the functions of large displacement, large load and high-speed focusing, realizes the functions of quick focusing and anti-shaking 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 a driving device for a camera lens, and more particularly, to a driving device and a driving method for a piezoelectric type three-axis camera, which are suitable for a handheld camera device.
Background
At present, a handheld camera device, especially a camera driving device of a mobile phone, basically and completely uses a Voice Coil Motor (VCM) to drive a whole lens, although such a method has the advantages of simple structure, mature technology, low cost, and the like, the following problems still exist:
the application scenes are basically limited to main shooting, auxiliary shooting, wide angle, micro distance, medium and low power long focus and the like with medium and low load and medium and low displacement, and cannot realize large load and large displacement to realize ultra-long distance shooting due to the limitation of a lens moving mode and a driving mode. With the urgent need of ultra-long-distance shooting, the realization of the high-power continuous optical zoom function of the camera driving device has become a great problem to be solved urgently in the current hand-held camera device, especially the camera driving device of the mobile phone.
Disclosure of Invention
The invention aims to provide a piezoelectric type triaxial camera driving device and a driving method which are reasonable in structure and reliable in use, solves the problem that the conventional camera lens driving device cannot realize large displacement, large load and high-speed focusing functions, realizes the functions of quick focusing and anti-shaking of a lens, and has 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:
the utility model provides a piezoelectric type triaxial drive arrangement that makes a video recording, its technical essential is, includes:
a base;
the protective shell is buckled with the base 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 used for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly used 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 used for driving the lens carrier to move along the Z axis relative to the second moving body;
and the position sensing unit comprises an X-direction position sensing component corresponding to the first moving body, a Y-direction position sensing component corresponding to the second moving body and a Z-direction position sensing component corresponding to the lens carrier.
In the piezoelectric type triaxial camera driving device, the first piezoelectric ceramic vibrator assembly and the second piezoelectric ceramic vibrator assembly have the same structure and respectively comprise a bearing frame and a piezoelectric ceramic vibrator arranged on the bearing frame, the piezoelectric ceramic vibrator comprises an elastic body and a piezoelectric ceramic piece fixed on the elastic body, and the corresponding ends of the bearing frame and the elastic body are connected with a plate spring together; the first piezoelectric ceramic vibrator assembly 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 spring, and an X-direction friction plate which is tightly contacted with the elastic body of the first piezoelectric ceramic vibrator assembly is grooved in the side wall of the first moving body and fixed; the second piezoelectric ceramic vibrator assembly is positioned on a 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 spring, and a Y-direction friction plate which is tightly contacted with an elastic body of the second piezoelectric ceramic vibrator assembly is formed in a groove in the side wall of the second moving body and is fixed; the third piezoelectric ceramic vibrator component comprises a cantilever type piezoelectric ceramic body connected with the inner side of the second moving body, a Z-direction active friction block arranged at the tail end of the cantilever type piezoelectric ceramic body, and a Z-direction passive friction block fixed with the lens carrier and in close contact with the active friction block.
In the piezoelectric type triaxial camera driving device, the side surfaces of the elastic body facing the X-direction friction plate and the Y-direction friction plate are provided with the comb-shaped protruding structures, and the comb-shaped protruding structures are in close contact with the corresponding X-direction friction plate or the corresponding Y-direction friction plate.
Foretell piezoelectric type triaxial drive arrangement that makes a video recording, the base adopts insulating material to make, including bottom plate and barricade, built-in increase intensity, get the metal material area of electricity and signal transmission effect in bottom plate and the barricade, the bottom plate edge is equipped with the conductive terminal extraction area of being connected with the metal material area, and the barricade top surface is equipped with the electrically conductive connecting portion of many places of being connected with the metal material area, the barricade of base is equipped with the electrode connecting portion I that corresponds first piezoceramics oscillator subassembly, be equipped with the electrode connecting portion II that corresponds second piezoceramics oscillator subassembly on the lateral wall of first moving body, the top surface of first moving body and second moving body is equipped with signal connection end respectively, and each signal connection end utilizes flexible conductor to be connected with the electrically conductive connecting portion of barricade top surface.
In the piezoelectric type triaxial camera driving device, the X-direction position sensing assembly, the Y-direction position sensing assembly and the Z-direction position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor, the upper surface of the bottom plate of the base is provided with two horizontal positioning grooves for embedding signal receivers of the X-direction position sensing component and the Y-direction position sensing component, the inner side surface of the second moving body is provided with a vertical positioning groove for embedding a signal receiver of the Z-position sensing component, the bottom surface of the first moving body is provided with a fixing groove I used for embedding a position sensor of the X-direction position sensing assembly, the bottom surface of the second moving body is provided with a fixing groove II used for embedding a position sensor of the Y-direction position sensing assembly, and the outer side surface of the lens carrier is provided with a fixing groove III used for embedding a position sensor of the Z-direction position sensing assembly.
In the piezoelectric type triaxial camera driving device, a plurality of prepressing assemblies arranged around the center of the lens carrier are arranged in a nesting gap between the second moving body and the lens carrier, each prepressing assembly comprises a prepressing elastic sheet and balls longitudinally arranged, each prepressing elastic sheet comprises two fixing parts used for being connected with the outer side wall of the lens carrier and an acting part 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 push against the acting part of the prepressing elastic sheet in the horizontal direction and can generate Z-direction relative displacement with the acting part, and the prepressing assemblies are used for providing motion guide 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 prepressing component is additionally arranged between the second moving body and the lens carrier and is a C-shaped metal elastic sheet which is fixed at one end, close to the second moving body, of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component, and the opening side of the C-shaped metal elastic sheet is fixed with the second moving body in a pressing manner so as to provide elastic prepressing 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 fixing frame in a shape like a Chinese character 'ji' and a spring, a cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is transversely arranged in the fixing frame in the shape like the Chinese character 'ji', one end of the spring is exposed, one end of the spring is connected with the fixing frame in the shape like the Chinese character 'ji', one end of the spring is connected with the bottom of a spring fixing groove of the second moving body, and the fixing frame in the shape like the Chinese character 'ji' and the spring provide elastic prepressing force for the third piezoelectric ceramic vibrator assembly;
or a prepressing assembly is arranged in the side wall of the second moving body and comprises a punching plate spring, the punching plate spring is of a structure shaped like a Chinese character 'ji', and is made of an elastic metal material, a fixing groove corresponding to the punching plate spring is arranged on the side wall of the second moving body, a cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is transversely arranged in the structure shaped like a Chinese character 'ji' of the punching plate spring, one end of the cantilever type piezoelectric ceramic body is exposed, and the upper clamping surface and the lower clamping surface of the punching plate spring provide elastic prepressing for the third piezoelectric ceramic vibrator assembly.
In the piezoelectric type triaxial camera driving device, X-direction guide grooves i are respectively formed at four corners of the upper surface of the base plate, X-direction guide grooves ii corresponding to the X-direction guide grooves i are formed at the bottom of the first moving body, X-direction guide rails for placing balls are formed correspondingly to the X-direction guide grooves i and the X-direction guide grooves ii, X-direction guide grooves iii are formed on the outer side wall of the top of the first moving body, and X-direction guide rails for placing balls are formed between the X-direction guide grooves iii and the inner side wall of the base retaining wall; the upper surface of the bottom 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, a Y-direction guide rail for placing balls is formed by the Y-direction guide groove I and the Y-direction guide groove II correspondingly, a Y-direction guide groove III is formed in the outer side wall of the top of the second moving body, and a Y-direction guide rail for placing balls is formed between the Y-direction guide groove III and the inner side wall of the first moving body.
In the piezoelectric type triaxial camera driving device, the inner side wall of the second moving body is provided with the rectangular groove for clamping the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic oscillator assembly, and the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic oscillator assembly is fixed with the rectangular groove.
In the piezoelectric type triaxial camera 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 mounting groove of the second moving body corresponding to the ball is higher than the position of the signal connecting end of the second moving body, the plane of the upper end of the longitudinal mounting groove is the bearing surface of the gasket, and the limit of the ball in the longitudinal mounting groove is realized by the gasket.
The driving method of the piezoelectric type triaxial camera driving device comprises the following technical key points: loading a high-frequency alternating current sine electric signal on a first piezoelectric ceramic vibrator component fixed on a base, driving a first moving body to move in the base along the X-axis direction by vibration generated by the first piezoelectric ceramic vibrator component, monitoring the motion condition of the first moving body in real time by a position sensor embedded at the bottom of the first moving body and a signal receiver on the upper surface of the base while the first moving body moves, and sending a position compensation signal to a corresponding control circuit of the first piezoelectric ceramic vibrator component to control the first moving body to move and adjust corresponding position precision so as to realize closed-loop control, wherein the closed-loop control is repeated until the preset precision is reached; loading a high-frequency alternating current sine electric signal to a second piezoelectric ceramic vibrator component fixed on the side surface of a first moving body, driving a second moving body to move in the first moving body along the Y-axis direction by vibration generated by the second piezoelectric ceramic vibrator component, monitoring the motion condition of the second moving body in real time by a position sensor embedded at the bottom of the second moving body and a signal receiver on the upper surface of a base while the second moving body moves, and sending a position compensation signal to a corresponding control circuit of the second piezoelectric ceramic vibrator component to control the second moving body to move and adjust corresponding position precision so as to realize closed-loop control, wherein the closed-loop control is repeatedly carried out until the preset precision is reached; and a high-frequency alternating current sine signal is loaded on a third piezoelectric ceramic vibrator component fixed in the second moving body, the vibration generated by the third piezoelectric ceramic vibrator component drives a lens carrier to move in the second moving body along the Z-axis direction, so that the focusing function is realized, a position sensor embedded in the side surface of the lens carrier and a signal receiver embedded in the side surface 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 component to control the movement of the lens carrier to adjust the corresponding position precision, so that closed-loop control is realized, and the operation is repeated until the preset precision is reached.
The invention has the beneficial effects that:
the invention applies the piezoelectric ceramic technology to a camera driving device, utilizes a third piezoelectric ceramic vibrator component to drive a lens carrier to move along a Z axis, realizes a basic focusing function, simultaneously utilizes a first piezoelectric ceramic vibrator component to drive a first moving body (driving a second moving body and the lens carrier) to move along an X axis relative to a base, and utilizes a second piezoelectric ceramic vibrator component to drive a second moving body to move along a Y axis relative to the first moving body, thereby realizing the anti-shake function of the lens. Through the cooperation of three drive assembly in the piezoelectricity drive unit to the image parameter is adjusted to carrier, first moving body, the mode of second moving body concerted motion, replaces traditional voice coil motor structure, realizes the high-speed function of focusing, has simple structure, small, no magnetic interference, and the thrust is big, the displacement is big, response speed is fast, positioning accuracy is high, the structure is firm, easily advantages such as 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 structural view of the base of the present invention;
fig. 5 is a schematic structural view of a first mobile body of the present invention;
fig. 6 is a schematic view of the structure of a second mobile body of the present invention;
fig. 7 is a structural schematic view of another view angle of the second moving body of the present invention;
FIG. 8 is a schematic view of the construction of the 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 unit according to the present invention;
fig. 12 is a schematic structural view of a pre-pressed leaf spring according to embodiment 1 of the present invention;
fig. 13 is a schematic view of the protective case of the present invention;
FIG. 14 is a schematic view of the construction of the flexible electrical conductor of the present invention;
fig. 15 is a schematic structural view of a pre-pressing assembly in embodiment 2 of the present invention;
fig. 16 is a schematic structural view of a pre-pressing assembly in embodiment 3 of the present invention;
fig. 17 is a schematic structural view of a pre-pressing assembly in embodiment 4 of the present invention.
In the figure: 1. base, 1001 horizontal locating 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 locating slot, 3004, longitudinal mounting slot, 3005, fixing slot II, 4, spacer, 5, lens carrier, 5001, fixing slot III, 6, signal connecting end, 7, flexible conductor, 8, ball, 9, first piezoelectric ceramic vibrator assembly, 9001, plate spring, 9002, bearing frame, 9003, piezoelectric ceramic vibrator, 9004. X-direction friction plate, 10, second piezoelectric ceramic vibrator assembly, 11, 12, third piezoelectric ceramic vibrator assembly, 1201, piezoelectric ceramic body, cantilever type friction block, 1202. Z-direction main movable friction block, 1203. Z-direction driven friction block, 13, prepressed elastic piece, fixing portion, 1302, acting portion, 14. Electrode connecting parts I and 15, electrode connecting parts II and 16, protective shells, 17, C-shaped metal elastic sheets, 18, a fixing frame shaped like a Chinese character 'ji', 19 springs and 20 stamping leaf springs.
Detailed Description
The invention is described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 14, the piezoelectric type triaxial imaging driving apparatus 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 role in supporting and limiting. The protective shell 16 is buckled with the base 1 to form an integrally formed 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 positioned 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 with respect to the base 1, a second piezoelectric ceramic vibrator assembly 10 for driving the second moving body 3 to move along the Y axis with respect 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 with respect 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 unit 9 and the second piezoelectric ceramic vibrator unit 10 have the same structure. Taking the first piezoelectric ceramic oscillator unit 9 as an example, it includes a carrier frame 9002, and a piezoelectric ceramic oscillator 9003 provided on the carrier frame 9002. The piezoelectric ceramic vibrator 9003 comprises an elastic body and piezoelectric ceramic pieces fixed on the elastic body, and the corresponding ends of the bearing frame 9002 and the elastic body 9003 are connected with a plate spring 9001 together. First piezoceramics oscillator subassembly 9 is located the X of base 1 to the barricade on, X sets up the hollow groove that corresponds bearing frame 9002 to on the barricade, and the hollow groove both sides are connected fixedly with leaf spring 9001, fluting and fixed X with the elastomer in close contact with of first piezoceramics oscillator subassembly 9 to friction plate 9004 on the lateral wall of first moving body 2. The second piezoceramic oscillator 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 a plate spring, and a Y-direction friction plate which is in close contact with an elastic body of the second piezoceramic oscillator assembly 10 is formed in a groove in the side wall of the second moving body and is fixed. The side faces of the elastic body facing the X-direction friction plate 9004 and the Y-direction friction plate are provided with comb-shaped protruding structures, and the comb-shaped protruding structures are in close contact with the corresponding X-direction friction plate 9004 or the Y-direction friction plate. The third piezo-ceramic vibrator assembly 12 includes a cantilever-type piezo-ceramic body 1201 connected to the inner side of the second movable body 3, a Z-direction active friction block 1202 provided at the distal end of the cantilever-type piezo-ceramic body 1201, and a Z-direction passive friction block 1203 fixed to the lens carrier 5 and closely contacting the Z-direction active friction block 1202.
The piezoelectric ceramic pieces 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, the upper surface of each subarea is provided with an independent inner electrode, the inner electrodes on the upper surfaces of the subareas with the same polarization direction and the corresponding outer electrodes on the end parts of the upper surfaces of the elastic bodies form an independent series circuit, and the upper surfaces of the piezoelectric ceramic pieces are totally two independent series circuits; the back of the piezoelectric ceramic piece is provided with a whole block of inner electrodes or independent inner electrodes corresponding to each polarization area, all the inner electrodes on the back and the corresponding outer electrodes on the upper surface end part of the elastic body form an independent series circuit, and therefore the first piezoelectric ceramic vibrator assembly and the second piezoelectric ceramic vibrator assembly are respectively provided with three independent series 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 polarization regions in a "field" shape, the polarization directions of adjacent polarization regions are opposite, an electrode on one surface in a region with the same polarization direction and a corresponding outer electrode form an independent series circuit, an inner electrode on the other surface in the four polarization regions and a corresponding outer electrode form an independent series circuit, and three independent series circuits are electrically connected with an external control circuit.
The base 1 is made of an insulating material and comprises a bottom plate and a retaining wall, a metal material belt for increasing strength, taking electricity and transmitting signals is arranged in the bottom plate and the retaining wall, a conductive terminal leading-out area connected with the metal material belt is arranged at the edge of the bottom plate, and a plurality of conductive connecting portions, namely signal connecting ends 6, connected with the metal material belt 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 barricade of base 1 is equipped with the electrode connecting portion I14 that corresponds first piezoceramics oscillator subassembly 9, be equipped with the electrode connecting portion II 15 that corresponds second piezoceramics oscillator subassembly 10 on the lateral wall of first moving body 2, the top surface of first moving body 2 and second moving body 3 is equipped with signal connection 6 respectively, and each signal connection 6 utilizes flexible electric conductor 7 to be connected with the signal connection 6 of barricade top surface.
The X-direction position sensing assembly, the Y-direction position sensing assembly and the Z-direction position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor. The utility model discloses a camera lens, including base 1, the bottom plate upper surface of base 1 is equipped with two horizontal positioning groove 1001 that are used for inlaying the signal receiver who adorns X position sensing subassembly, Y position sensing subassembly, the medial surface of second moving body 3 is equipped with one and is used for inlaying the vertical positioning groove 3003 that adorns the signal receiver of Z position sensing subassembly, horizontal positioning groove 1001 and vertical positioning groove 3003's tank bottom are equipped with electrically conductive connecting portion respectively, the bottom surface of first moving body 2 is equipped with the fixed slot I that is used for inlaying the position inductor who adorning X position sensing subassembly, and the bottom surface of second moving body 3 is equipped with the fixed slot II 3005 that is used for inlaying the position inductor who adorns Y position sensing subassembly, and the lateral surface of camera lens carrier 5 is equipped with the III 5001 that is used for inlaying the position inductor fixed slot that adorns Z position sensing subassembly.
A plurality of prepressing assemblies arranged around the center of the lens carrier 5 are arranged in a nesting gap between the second moving body 3 and the lens carrier 5, each prepressing assembly comprises a prepressing elastic sheet 13 and balls 11 arranged longitudinally, each prepressing elastic sheet 13 comprises two fixing parts 1301 used for being connected with the outer side wall of the lens carrier 5 and an acting part 1302 arranged between the two fixing parts 1301, the inner side wall of the second moving body 3 is provided with a longitudinal installation groove 3004 corresponding to the balls 11, the balls 11 press the acting part 1302 of the prepressing elastic sheet 13 in the horizontal direction and can generate Z-direction relative displacement with the acting part, and the prepressing assemblies are used for providing motion guide support for the second moving body 3 and the lens carrier 5 and providing prepressing force for the lens carrier 5 and the third piezoceramic oscillator assembly 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 fixedly bonded 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 mounting groove 3004 of the second moving body 3 corresponding to the ball is higher than the position of the signal connecting end 6 of the second moving body 3, the plane of the upper end of the longitudinal mounting groove 3004 is a bearing surface of the gasket 4, and the gasket 4 is used for limiting the ball 11 in the longitudinal mounting groove 3004.
X-direction guide grooves I1002 are respectively formed in four corners of the upper surface of the bottom plate of the base 1, X-direction guide grooves II 2002 corresponding to the X-direction guide grooves I1002 are formed in the bottom of the first moving body 2, and X-direction guide rails for placing balls are formed in the X-direction guide grooves I1002 and the X-direction guide grooves II 2002 correspondingly. An X-direction guide groove III 2001 is formed in the outer side wall of the top 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 first moving body 2 is further provided with a Y-direction guide groove I2003 on the upper surface of the bottom, the second moving body 3 is provided with a Y-direction guide groove II 3001 corresponding to the Y-direction guide groove I2003 on the bottom, the Y-direction guide groove I2003 and the Y-direction guide groove II 3001 correspond to each other to form a Y-direction guide track for placing the balls, the second moving body 3 is provided with a Y-direction guide groove III 3002 on the outer side wall of the top, and the Y-direction guide groove III 3002 and the inner side wall of the first moving body 2 form a Y-direction guide track for placing the balls 8.
The driving method of the piezoelectric type triaxial camera driving device specifically comprises the following steps: loading a high-frequency alternating current sinusoidal electrical signal on a first piezoelectric ceramic vibrator assembly 9 fixed on a base, wherein the first moving body 2 is driven by vibration generated by the first piezoelectric ceramic vibrator assembly 9 to move in the base 1 along the X-axis direction, a position sensor embedded at the bottom of the first moving body 2 and a signal receiver on the upper surface of the base 1 monitor the movement condition of the first moving body 2 in real time while the first moving body 2 moves, and send a position compensation signal to a corresponding control circuit of the first piezoelectric ceramic vibrator assembly 9 to control the first moving body 2 to move and adjust corresponding position precision so as to realize closed-loop control, and the operation is repeated until the preset precision is reached; loading a high-frequency alternating current sine electric signal on a second piezoelectric ceramic vibrator assembly 10 fixed on the side surface of the first moving body 2, driving a second moving body 3 to move in the first moving body 2 along the Y-axis direction by vibration generated by the second piezoelectric ceramic vibrator assembly 10, monitoring the motion condition of the second moving body 3 in real time by a position sensor embedded at the bottom of the second moving body 3 and a signal receiver on the upper surface of the base 1 while the second moving body 3 moves, and sending a position compensation signal to a corresponding control circuit of the second piezoelectric ceramic vibrator assembly 10 to control the second moving body 3 to move and adjust corresponding position precision so as to realize closed-loop control, and repeating the steps until the preset precision is reached; the high-frequency alternating current sine electrical signal is loaded on a third piezoelectric ceramic vibrator component 12 fixed in the second moving body 3, vibration generated by the third piezoelectric ceramic vibrator component 12 drives the lens carrier 5 to move in the second moving body 3 along the Z-axis direction, so that a focusing function is realized, when the lens carrier 5 moves, a position sensor embedded in the side surface of the lens carrier 5 and a signal receiver embedded in the side surface of the second moving body 3 monitor the movement condition of the lens carrier 5 in real time, and send a position compensation signal to the third piezoelectric ceramic vibrator component 12 to control the lens carrier 5 to move and adjust the corresponding position precision, so that closed-loop control is realized, and the operation is repeated until the preset precision is reached.
Example 2
In this embodiment, as shown in fig. 15, the preload assembly used for the third piezoceramic oscillator module 12 is different from that used in embodiment 1.
That is, a pre-pressing assembly is further disposed between the second moving body 3 and the lens carrier 5, the pre-pressing assembly is a C-shaped metal elastic sheet 17, the C-shaped metal elastic sheet 17 is fixed to one end of the cantilever-type piezoceramic body 1201 of the third piezoceramic oscillator assembly 12, the end of the cantilever-type piezoceramic body 1201 close to the second moving body 3, and the opening side of the C-shaped metal elastic sheet 17 is fixed to the second moving body 3 by pressure to provide elastic pre-pressing force for the third piezoceramic oscillator assembly 12.
The rest is the same as example 1.
Example 3
In this embodiment, as shown in fig. 16, the preload assembly used for the third piezoceramic oscillator module 12 is different from that used in embodiment 1.
A prepressing assembly is arranged in the side wall of the second moving body 3 and comprises a fixing frame 18 in a shape like a Chinese character 'ji' and a spring 19, the cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator assembly 12 is transversely arranged in the fixing frame 18 in the shape like the Chinese character 'ji', one end of the cantilever type piezoelectric ceramic body is exposed and connected with the active friction block 1202, one end of the spring 19 is connected with the side wall of the fixing frame 18 in the shape like the Chinese character 'ji', 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 fixing frame 18 in the shape like the Chinese character 'ji' and the spring 19 provide elastic prepressing force for the third piezoelectric ceramic vibrator assembly 12;
the rest is the same as example 1.
Example 4
In this embodiment, as shown in fig. 17, the preload assembly used for the third piezoceramic oscillator module 12 is different from that used in embodiment 1.
A prepressing assembly is arranged in the side wall of the second moving body 3 and comprises a punching plate spring 20, the punching plate spring 20 is of a structure shaped like a Chinese character 'ji' and is made of an elastic metal material, a fixing groove corresponding to the punching plate spring 20 is arranged on the side wall of the second moving body 3, a cantilever type piezoelectric ceramic body 1201 of the third piezoelectric ceramic vibrator assembly is transversely arranged in the structure shaped like a Chinese character 'ji' of the punching plate spring 20, one end of the cantilever type piezoelectric ceramic body is exposed and connected with an active friction block 1202, and the upper clamping surface and the lower clamping surface of the punching plate spring 20 provide elastic prepressing for the third piezoelectric ceramic vibrator assembly 12.
The rest is the same as example 1.
The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (10)
1. A piezoelectric type triaxial image pickup driving apparatus, comprising:
a base;
the protective shell is buckled with the base 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 used for driving the first moving body to move along the X axis relative to the base, a second piezoelectric ceramic vibrator assembly used 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 used for driving the lens carrier to move along the Z axis relative to the second moving body;
and the position sensing unit comprises an X-direction position sensing component corresponding to the first moving body, a Y-direction position sensing component corresponding to the second moving body and a Z-direction position sensing component corresponding to the lens carrier.
2. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: the first piezoelectric ceramic vibrator component and the second piezoelectric ceramic vibrator component have the same structure and respectively comprise a bearing frame and a piezoelectric ceramic vibrator arranged on the bearing frame, wherein the piezoelectric ceramic vibrator comprises an elastic body and a piezoelectric ceramic piece fixed on the elastic body, and the corresponding ends of the bearing frame and the elastic body are connected with a plate spring together; the first piezoelectric ceramic vibrator assembly 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 spring, and an X-direction friction plate which is tightly contacted with the elastic body of the first piezoelectric ceramic vibrator assembly is grooved in the side wall of the first moving body and fixed; the second piezoelectric ceramic vibrator assembly is positioned on a 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 spring, and a Y-direction friction plate which is tightly contacted with an elastic body of the second piezoelectric ceramic vibrator assembly is formed in a groove in the side wall of the second moving body and is fixed; the third piezoelectric ceramic vibrator component comprises a cantilever type piezoelectric ceramic body connected with the inner side of the second moving body, a Z-direction active friction block arranged at the tail end of the cantilever type piezoelectric ceramic body, and a Z-direction passive friction block fixed with the lens carrier and in close contact with the active friction block.
3. The piezoelectric triaxial image pickup driving apparatus according to claim 2, wherein: the side faces of the elastic body facing the X-direction friction plate and the Y-direction friction plate are provided with comb-shaped protruding structures, and the comb-shaped protruding structures are in close contact with the corresponding X-direction friction plate or the corresponding Y-direction friction plate.
4. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: the base adopts insulating material to make, including bottom plate and barricade, built-in increase intensity, the metal material area of getting electricity and signal transmission effect in bottom plate and the barricade, the bottom plate edge is equipped with the conductive terminal area of drawing forth of being connected with the metal material area, and the barricade top surface is equipped with the electrically conductive connecting portion of many places of being connected with the metal material area, the barricade of base is equipped with the electrode connecting portion I that corresponds first piezoceramics oscillator subassembly, be equipped with the electrode connecting portion II that corresponds second piezoceramics oscillator subassembly on the lateral wall of first moving body, the top surface of first moving body and second moving body is equipped with signal connection end respectively, and each signal connection end utilizes flexible conductor to be connected with the electrically conductive connecting portion of barricade top surface.
5. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: the X-direction position sensing assembly, the Y-direction position sensing assembly and the Z-direction position sensing assembly respectively comprise a position sensor and a signal receiver corresponding to the position sensor, the upper surface of the bottom plate of the base is provided with two horizontal positioning grooves for embedding signal receivers of the X-direction position sensing component and the Y-direction position sensing component, the inner side surface of the second moving body is provided with a vertical positioning groove for embedding a signal receiver of the Z-position sensing component, the bottom surface of the first moving body is provided with a fixing groove I used for embedding a position sensor of the X-direction position sensing assembly, the bottom surface of the second moving body is provided with a fixing groove II used for embedding a position sensor of the Y-direction position sensing assembly, and the outer side surface of the lens carrier is provided with a fixing groove III used for embedding a position sensor of the Z-direction position sensing assembly.
6. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: a plurality of prepressing assemblies arranged around the center of the lens carrier are arranged in a nesting gap between the second moving body and the lens carrier, each prepressing assembly consists of a prepressing elastic sheet and balls arranged longitudinally, each prepressing elastic sheet consists of two fixing parts used for being connected with the outer side wall of the lens carrier and an acting part 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 push the acting part of the prepressing elastic sheet in the horizontal direction and can generate Z-direction relative displacement with the acting part, and the prepressing assemblies are used for providing motion guide support for the second moving body and the lens carrier and providing prepressing force for the lens carrier and a third piezoelectric ceramic vibrator assembly;
or a prepressing component is additionally arranged between the second moving body and the lens carrier and is a C-shaped metal elastic sheet which is fixed at one end, close to the second moving body, of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator component, and the opening side of the C-shaped metal elastic sheet is fixed with the second moving body in a pressing manner so as to provide elastic prepressing 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 fixing frame in a shape like a Chinese character 'ji' and a spring, a cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is transversely arranged in the fixing frame in the shape like the Chinese character 'ji', one end of the spring is exposed, one end of the spring is connected with the fixing frame in the shape like the Chinese character 'ji', one end of the spring is connected with the bottom of a spring fixing groove of the second moving body, and the fixing frame in the shape like the Chinese character 'ji' and the spring provide elastic prepressing force for the third piezoelectric ceramic vibrator assembly;
or a prepressing assembly is arranged in the side wall of the second moving body and comprises a punching plate spring, the punching plate spring is of a structure shaped like a Chinese character 'ji', and is made of an elastic metal material, a fixing groove corresponding to the punching plate spring is arranged on the side wall of the second moving body, a cantilever type piezoelectric ceramic body of the third piezoelectric ceramic vibrator assembly is transversely arranged in the structure shaped like a Chinese character 'ji' of the punching plate spring, one end of the cantilever type piezoelectric ceramic body is exposed, and the upper clamping surface and the lower clamping surface of the punching plate spring provide elastic prepressing for the third piezoelectric ceramic vibrator assembly.
7. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: x-direction guide grooves I are respectively formed in four corners of the upper surface of a bottom plate of the base, X-direction guide grooves II corresponding to the X-direction guide grooves I are formed in the bottom of the first moving body, X-direction guide rails for placing balls are formed in the X-direction guide grooves I and the X-direction guide grooves II correspondingly, X-direction guide grooves III are formed in the outer side wall of the top of the first moving body, and X-direction guide rails for placing balls are formed between the X-direction guide grooves III and the inner side wall of the base retaining wall; the upper surface of the bottom 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, a Y-direction guide rail for placing balls is formed by the Y-direction guide groove I and the Y-direction guide groove II correspondingly, a Y-direction guide groove III is formed in the outer side wall of the top of the second moving body, and a Y-direction guide rail for placing balls is formed between the Y-direction guide groove III and the inner side wall of the first moving body.
8. The piezoelectric triaxial image pickup driving apparatus according to claim 1, wherein: the inner side wall of the second moving body is provided with a rectangular groove used for clamping a fixed end of a cantilever type piezoelectric ceramic body of a third piezoelectric ceramic oscillator assembly, and the fixed end of the cantilever type piezoelectric ceramic body of the third piezoelectric ceramic oscillator assembly is fixed with the rectangular groove.
9. The piezoelectric triaxial image pickup driving apparatus according to claim 6, wherein: the top surface of the second moving body is additionally provided with a gasket, the plane of the upper end of the longitudinal mounting groove of the second moving body corresponding to the ball is higher than the position of the signal connecting end of the second moving body, the plane of the upper end of the longitudinal mounting groove is a bearing surface of the gasket, and the gasket is utilized to limit the ball in the longitudinal mounting groove.
10. A driving method of the piezoelectric type triaxial image pickup driving apparatus according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, characterized in that: loading a high-frequency alternating current sine electric signal on a first piezoelectric ceramic vibrator component fixed on a base, driving a first moving body to move in the base along the X-axis direction by vibration generated by the first piezoelectric ceramic vibrator component, monitoring the motion condition of the first moving body in real time by a position sensor embedded at the bottom of the first moving body and a signal receiver on the upper surface of the base while the first moving body moves, and sending a position compensation signal to a corresponding control circuit of the first piezoelectric ceramic vibrator component to control the first moving body to move and adjust corresponding position precision so as to realize closed-loop control, wherein the closed-loop control is repeated until the preset precision is reached; loading a high-frequency alternating current sine electric signal to a second piezoelectric ceramic vibrator component fixed on the side surface of a first moving body, driving a second moving body to move in the first moving body along the Y-axis direction by vibration generated by the second piezoelectric ceramic vibrator component, monitoring the motion condition of the second moving body in real time by a position sensor embedded at the bottom of the second moving body and a signal receiver on the upper surface of a base while the second moving body moves, and sending a position compensation signal to a corresponding control circuit of the second piezoelectric ceramic vibrator component to control the second moving body to move and adjust corresponding position precision so as to realize closed-loop control, wherein the closed-loop control is repeatedly carried out until the preset precision is reached; and a high-frequency alternating current sine signal is loaded on a third piezoelectric ceramic vibrator component fixed in the second moving body, the vibration generated by the third piezoelectric ceramic vibrator component drives a lens carrier to move in the second moving body along the Z-axis direction, so that the focusing function is realized, a position sensor embedded in the side surface of the lens carrier and a signal receiver embedded in the side surface 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 component to control the movement of the lens carrier to adjust the corresponding position precision, so that closed-loop control is realized, and the operation is repeated until the preset precision is reached.
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| CN114845025A (en) * | 2022-04-29 | 2022-08-02 | Oppo广东移动通信有限公司 | Piezoelectric motor, imaging mechanism, and electronic apparatus |
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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 |
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