CN111308638A - Lens moving mechanism based on piezoelectric drive - Google Patents
Lens moving mechanism based on piezoelectric drive Download PDFInfo
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- CN111308638A CN111308638A CN202010344188.7A CN202010344188A CN111308638A CN 111308638 A CN111308638 A CN 111308638A CN 202010344188 A CN202010344188 A CN 202010344188A CN 111308638 A CN111308638 A CN 111308638A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 64
- 238000006073 displacement reaction Methods 0.000 claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims 1
- 230000003321 amplification Effects 0.000 description 12
- 238000003199 nucleic acid amplification method Methods 0.000 description 12
- 230000009471 action Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
- H02N2/043—Mechanical transmission means, e.g. for stroke amplification
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Abstract
The invention discloses a lens moving mechanism based on piezoelectric driving, which comprises an upper cover and a base, wherein the upper end and the lower end of a hollow shell are respectively fixed with the upper cover and the base through screws, and round holes are formed in the middle parts of the upper cover and the base; the lens barrel comprises a shell, a base, a pair of rectangular grooves, an amplifying mechanism, a moving ring and a lens, wherein the rectangular grooves are formed in the shell, the amplifying mechanism is arranged in the rectangular grooves, the lower end of the amplifying mechanism is connected with the base, the upper end of the amplifying mechanism is fixedly connected with the moving ring, the two sides of the moving ring are slidably connected with the rectangular grooves, and the moving ring is used for mounting a lens; according to the invention, the three-stage displacement amplifying mechanism consisting of 11 flexible hinge groups is adopted to amplify the output displacement of the piezoelectric stack, so that a larger output displacement of the movable ring can be obtained, the moving distance of the lens is greatly increased, the movable ring and the shell move through the guide rail pair, the lens can accurately move, and the position of the displacement detection sensor is reserved in the shell, so that the moving positions of the movable ring and the lens can be conveniently measured.
Description
Technical Field
The invention belongs to the technical field of precise driving, and particularly relates to a lens moving mechanism based on piezoelectric driving.
Background
The precision driving technology plays an important role in the fields of micro-robots, aerospace, medical instruments, precision positioning and the like, wherein a lens moving mechanism is a commonly used precision driving device. As a precise driving mechanism, the lens movement requires the characteristics of high response speed, high precision, good stability and the like. The piezoelectric intelligent material is concerned and applied because of the advantages of small volume, large deformation, no magnetic field interference, low driving voltage and the like. Piezoelectric materials are mainly used in micro-robots, micro-linear actuators and actuators. At present, the output displacement of a lens moving mechanism based on piezoelectric driving is small, and the requirement for large displacement movement of a lens is difficult to meet.
The invention provides a lens moving mechanism based on piezoelectric drive, so that the lens moving mechanism has the advantages of simple structure, large output displacement, high positioning precision and the like.
Disclosure of Invention
In order to achieve the purpose, the invention provides the following technical scheme: a lens moving mechanism based on piezoelectric drive comprises an upper cover, a shell, a base, a screw A, a wire hole, a screw B, an amplifying mechanism, a moving ring, a piezoelectric stack A and a piezoelectric stack B,
the interior of the lens moving mechanism based on piezoelectric driving is of a hollow structure, and the outer surface of the lens moving mechanism is of a cuboid structure;
the base is of a cuboid structure provided with a middle round hole, and the surface of the base is provided with 4 large holes for placing the screws A and 6 small holes for placing the screws B;
the shell is connected with the base through 4 screws A, a cuboid mechanism is arranged outside the shell, the interior of the shell consists of a cuboid groove, a cylindrical groove and a detection groove, the cuboid groove and the detection groove are communicated with the interior of the cylindrical groove, and the detection groove is used for storing a displacement detection sensor;
the amplification mechanism is arranged in two rectangular grooves in the shell, the bottom of the amplification mechanism is connected with the base through 6 screws B, and the amplification mechanism consists of a first flexible hinge group, a second flexible hinge group, a third flexible hinge group, a fourth flexible hinge group, a fifth flexible hinge group, a sixth flexible hinge group, a seventh flexible hinge group, an eighth flexible hinge group, a ninth flexible hinge group, a tenth flexible hinge group and an eleventh flexible hinge group;
the two piezoelectric stacks A are respectively vertically placed at the lower ends of the inner parts of the two amplifying mechanisms, are connected with a first flexible hinge group connecting block, and are matched with a second flexible hinge group, a third flexible hinge group, a fourth flexible hinge group, a fifth flexible hinge group, a sixth flexible hinge group, a seventh flexible hinge group and an eighth flexible hinge group to generate two-stage displacement amplification; the third flexible hinge is connected with the fourth flexible hinge through a connecting rod; the fourth flexible hinge, the fifth flexible hinge and the resistance arm are arranged in parallel; the sixth flexible hinge is connected with the seventh flexible hinge through a connecting rod; a third lever structure is formed by the seventh flexible hinge, the ninth flexible hinge and the seventh flexible hinge, a power arm is arranged between the seventh flexible hinge and the eighth flexible hinge, and a resistance arm is arranged between the eighth flexible hinge and the ninth flexible hinge;
the tenth flexible hinge group and the eleventh flexible hinge group are composed of a T-shaped connecting block and a square connecting block, and each group of hinges is composed of four flexible hinges; the tenth flexible hinge group, the eleventh flexible hinge group, the T-shaped connecting block and the square connecting block form a closed loop together, the piezoelectric stacks B are arranged in the closed loop, the two piezoelectric stacks B are respectively and horizontally placed at the upper end of the amplifying mechanism, and the piezoelectric stacks B, the eleventh flexible hinge group and the tenth flexible hinge group form third-stage displacement amplification together;
the moving ring is composed of a lug, a side hole and a positioning block, the moving ring is fixedly connected with the amplifying mechanism through the lug, the lug slides up and down in the rectangular groove, meanwhile, the joint of the lug and the moving ring main body is embedded into the communicated part between the rectangular groove and the inside of the cylindrical groove in the shell, and the side hole and the positioning block are used for installing and positioning a lens to be moved;
the upper cover is fixed on the shell through four screws A.
The lens moving mechanism based on piezoelectric driving is driven by a piezoelectric stack A and a piezoelectric stack B together, the piezoelectric stack A and the piezoelectric stack B are driven by the same direct-current voltage signal, the highest driving voltage is 150V, under the driving of the voltage signal, the piezoelectric stack A and the piezoelectric stack B generate extension deformation, the deformation of the piezoelectric stack drives the flexible hinge to deform, under the lever action of the amplifying mechanism, the deformation of the piezoelectric stack is amplified, and the moving ring obtains larger linear motion displacement through the three-level displacement amplifying action of the flexible hinge.
Compared with the prior art, the invention has the beneficial effects that:
the invention adopts the three-stage displacement amplifying mechanism consisting of 11 flexible hinge groups to amplify the output displacement of the piezoelectric stack, can obtain larger output displacement of the movable ring, greatly improves the moving distance of the lens, realizes the accurate movement of the lens by the movement of the guide rail pair between the movable ring and the shell, and leaves the position of the displacement detection sensor in the shell to conveniently measure the moving displacement of the movable ring and the lens, so the invention has wider application prospect in the movement of the lens by the piezoelectric drive.
Drawings
Fig. 1 is a perspective view of a lens moving mechanism based on piezoelectric driving;
fig. 2 is a bottom view of a lens moving mechanism based on piezoelectric driving;
fig. 3 is a sectional view of a lens moving mechanism based on piezoelectric driving;
fig. 4 is an internal structural view of a lens moving mechanism based on piezoelectric driving;
fig. 5 is a structural view of a housing of a lens moving mechanism based on piezoelectric driving;
fig. 6 is a moving ring structure view of a lens moving mechanism based on piezoelectric driving;
fig. 7 is an enlarged mechanism diagram of a lens moving mechanism based on piezoelectric driving;
fig. 8 is a displacement amplification schematic diagram of an amplification mechanism of a lens movement mechanism based on piezoelectric driving.
And (3) identification and explanation: 1-an upper cover, 2-a shell, 3-a base, 4-a screw A, 5-a wire hole, 6-a screw B, 7-an amplifying mechanism, 8-a moving ring, 9-a piezoelectric stack A and 10-a piezoelectric stack B;
2-1: rectangular groove A, 2-2: rectangular groove B, 2-3: cylindrical groove, 2-4: detection tank, 8-1: lugs A, 8-2: lugs B, 8-3: side hole A, 8-4: side hole B, 8-5: positioning blocks A and 8-6: positioning blocks B, 8-7: positioning block C, 11-1: first flexible hinge group a, 11-2: first flexible hinge group B, 12-1: second flexible hinge group a, 12-2: second flexible hinge group B, 13-1: third flexible hinge group a, 13-2: third flexible hinge group B, 14-1: fourth flexible hinge group a, 14-2: fourth flexible hinge group B, 15-1: fifth flexible hinge group a, 15-2: fifth flexible hinge group B, 16-1: sixth flexible hinge group a, 16-2: sixth flexible hinge group B, 17-1: seventh flexible hinge group a, 17-2: seventh flexible hinge group B, 18-1: eighth flexible hinge group a, 18-2: eighth flexible hinge group B, 19-1: ninth flexible hinge group a, 19-2: ninth flexible hinge group B, 20-1: tenth flexible hinge group a, 20-2: tenth flexible hinge group B, 20-3: tenth flexible hinge group C, 20-4: tenth flexible hinge group D, 21-1: eleventh flexible hinge group a, 21-2: eleventh flexible hinge group B, 21-3: eleventh flexible hinge group C, 21-4: an eleventh flexible hinge set D.
Detailed description of the invention
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, the present invention provides a lens moving mechanism based on piezoelectric driving, which includes an upper cover 1, a housing 2, a base 3, a screw a4, a wire hole 5, a screw B6, an amplifying mechanism 7, a moving ring 8, a piezoelectric stack a9 and a piezoelectric stack B10, wherein the lens moving mechanism based on piezoelectric driving has a hollow interior and a cuboid exterior; the base 1 is of a cuboid structure with a middle round hole, and the surface of the base is provided with 4 large holes for placing screws A4 and 6 small holes for placing screws B6; the shell 2 is connected with the base 3 through 4 screws A4, a cuboid mechanism is arranged outside the shell 2, the interior of the shell is composed of a rectangular groove A2-1, a rectangular groove B2-2, a cylindrical groove 2-3 and a detection groove 2-4, the rectangular groove A2-1, the rectangular groove B2-2 and the detection groove 2-4 are communicated with the interior of the cylindrical groove 2-3, and the detection groove 2-4 is used for storing a displacement detection sensor;
the amplification mechanism 7 is arranged in two rectangular grooves in the shell 2, the bottom of the amplification mechanism is connected with the base 3 through 6 screws B6, and the amplification mechanism 7 comprises a first flexible hinge group A11-1, a first flexible hinge group B11-2, a second flexible hinge group A12-1, a second flexible hinge group B12-2, a third flexible hinge group A13-1, a third flexible hinge group B13-2, a fourth flexible hinge group A14-1, a fourth flexible hinge group B14-2, a fifth flexible hinge group A15-1, a fifth flexible hinge group B15-2, a sixth flexible hinge group A16-1, a sixth flexible hinge group B16-2, a seventh flexible hinge group A17-1, a seventh flexible hinge group B17-2, an eighth flexible hinge group A18-1, an eighth flexible hinge group B18-2, and a ninth flexible hinge group A19-1, Ninth flexible hinge group B19-2, tenth flexible hinge group A20-1, tenth flexible hinge group B20-2, tenth flexible hinge group C20-3, tenth flexible hinge group D20-4, eleventh flexible hinge group A21-1, eleventh flexible hinge group B21-2, eleventh flexible hinge group C21-3 and eleventh flexible hinge group D21-4;
the two piezoelectric stacks A9 are respectively vertically placed at the middle lower ends inside the two amplifying mechanisms 7, are connected with connecting blocks of a first flexible hinge group A11-1 and a first flexible hinge group B11-2, and are simultaneously matched with a second flexible hinge group A12-1, a second flexible hinge group B12-2, a third flexible hinge group A13-1, a third flexible hinge group B13-2, a fourth flexible hinge group A14-1, a fourth flexible hinge group B14-2, a fifth flexible hinge group A15-1, a fifth flexible hinge group B15-2, a sixth flexible hinge group A16-1, a sixth flexible hinge group B16-2, a seventh flexible hinge group A17-1, a seventh flexible hinge group B17-2, an eighth flexible hinge group A18-1 and an eighth flexible hinge group B18-2 to generate two-stage displacement amplification, the two piezoelectric stacks B10 are respectively horizontally placed at the upper end of the amplifying mechanism 7, and form third-stage displacement amplification together with a tenth flexible hinge group A20-1, a tenth flexible hinge group B20-2, a tenth flexible hinge group C20-3, a tenth flexible hinge group D20-4, an eleventh flexible hinge group A21-1, an eleventh flexible hinge group B21-2, an eleventh flexible hinge group C21-3 and an eleventh flexible hinge group D21-4;
the moving ring 8 is composed of a lug A8-1, a lug B8-2, a side hole A8-3, a side hole B8-4, a positioning block A8-5, a positioning block B8-6 and a positioning block C8-7, the moving ring 8 is fixedly connected with the amplifying mechanism 7 through the lug A8-1 and the lug B8-2, the lug A8-1 and the lug B8-2 slide up and down in a rectangular groove A2-1 and a rectangular groove B2-2, meanwhile, the joints of the lug A8-1 and the lug B8-2 and the moving ring body are embedded into a communicated part of a rectangular groove A2-1, a rectangular groove B2-2 and a cylindrical groove 2-3 in the shell, and the side hole A8-3, the side hole B8-4, a positioning block A8-5, a positioning block B8-6 and a positioning block C8-7 are used for installing and positioning a lens needing to be moved; the upper cover 1 is fixed to the housing 2 by four screws a 4.
The lens moving mechanism based on piezoelectric driving is driven by a piezoelectric stack A9 and a piezoelectric stack B10 together, the piezoelectric stack A9 and the piezoelectric stack B10 are driven by the same direct-current voltage signal, the highest driving voltage is 150V, under the driving of the voltage signal, the piezoelectric stack A9 and the piezoelectric stack B10 generate extension deformation, the deformation of the piezoelectric stack A9 and the piezoelectric stack B10 drives the flexible hinge to deform, under the lever action of the amplifying mechanism, the deformation of the piezoelectric stack A9 and the deformation of the piezoelectric stack B10 are amplified, and the moving ring 8 obtains large linear motion displacement through the three-level displacement amplifying action of the flexible hinge.
Compared with the prior art, the invention adopts the three-stage displacement amplifying mechanism 7 consisting of 11 flexible hinge groups to amplify the output displacement of the piezoelectric stack A9 and the piezoelectric stack B10, can obtain larger output displacement of the movable ring 8, greatly improves the moving distance of the lens, realizes accurate movement of the lens by moving the movable ring 8 and the shell 2 through the guide rail pair, and leaves the position of the displacement detection sensor in the shell 2 to conveniently measure the moving displacement of the movable ring 8 and the lens, so the invention has wider application prospect in lens movement of piezoelectric drive.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The piezoelectric driving-based lens moving mechanism is characterized in that an upper cover and a base are fixed at the upper end and the lower end of a hollow shell respectively through screws, and round holes are formed in the middle parts of the upper cover and the base; the lens barrel comprises a shell, a base, a pair of rectangular grooves, an amplifying mechanism, a moving ring and a lens, wherein the rectangular grooves are formed in the shell, the amplifying mechanism is arranged in the rectangular grooves, the lower end of the amplifying mechanism is connected with the base, the upper end of the amplifying mechanism is fixedly connected with the moving ring, the two sides of the moving ring are slidably connected with the rectangular grooves, and the moving ring is used for mounting a lens; the amplifying mechanism consists of an upper lever structure and a lower lever structure, the upper lever structure and the lower lever structure are connected through a flexible hinge, a piezoelectric stack B is horizontally arranged in the upper lever structure, and a piezoelectric stack A is vertically arranged in the lower lever structure.
2. The lens moving mechanism based on piezoelectric driving according to claim 1, wherein a rectangular groove a, a rectangular groove B and a cylindrical groove are arranged in the housing, the housing is a rectangular solid as a whole, the rectangular groove a and the rectangular groove B are arranged in parallel in the housing, the cylindrical groove is arranged in the middle of the housing, and the axis of the cylindrical groove coincides with the axis of the housing; the cylindrical groove is communicated with the rectangular groove A and the rectangular groove B, and the moving ring is arranged in the cylindrical groove.
3. The lens moving mechanism based on piezoelectric driving according to claim 2, wherein the moving ring includes: the ring comprises a ring body, a lug A, a lug B, a side hole A, a side hole B and positioning blocks, wherein the lug A and the lug B are oppositely arranged on the ring body, a connecting line of the side hole A and the side hole B is oppositely arranged on the ring body and is vertical to a connecting line of the lug A and the lug B, the three positioning blocks are respectively arranged at the positions of three vertexes of an inscribed triangle of the ring body, and the lug A and the lug B are respectively and fixedly connected to an amplifying mechanism.
4. The lens moving mechanism based on piezoelectric driving according to claim 1, wherein the lower lever structure is composed of nine sets of flexible hinges, each set of flexible hinges includes two flexible hinges symmetrically arranged, a first set of flexible hinges is connected by a connecting block, the connecting block is in contact with the piezoelectric stack a, the first to third flexible hinges constitute the first lever structure, the second flexible hinge serves as a fulcrum, a power arm is arranged between the first flexible hinge and the second flexible hinge, and a resistance arm is arranged between the third flexible hinge and the second flexible hinge; the third flexible hinge is connected with the fourth flexible hinge through a connecting rod; the fourth flexible hinge, the fifth flexible hinge and the resistance arm are arranged in parallel; the sixth flexible hinge is connected with the seventh flexible hinge through a connecting rod; a third lever structure is formed by the seventh flexible hinge, the ninth flexible hinge and the seventh flexible hinge, a power arm is arranged between the seventh flexible hinge and the eighth flexible hinge, and a resistance arm is arranged between the eighth flexible hinge and the ninth flexible hinge; the three groups of lever structures amplify the upward deformation of the piezoelectric stack A.
5. The lens moving mechanism based on piezoelectric driving according to claim 4, wherein the upper lever structure is composed of tenth and eleventh flexible hinge groups, a T-shaped connecting block and a square connecting block, and each group of hinges is composed of four flexible hinges; the tenth flexible hinge group, the eleventh flexible hinge group, the T-shaped connecting block and the square connecting block form a closed loop together, and the piezoelectric stack B is arranged in the closed loop.
6. The lens moving mechanism based on piezoelectric driving according to claim 2, wherein the housing further comprises a detection groove and a line hole, the detection groove is disposed at a side of the cylindrical groove and is communicated with the cylindrical groove, and an axis of the detection groove is parallel to the cylindrical groove; the line hole is arranged on the side wall of the shell and communicated with the detection groove, and the detection groove is used for placing the displacement sensor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010344188.7A CN111308638B (en) | 2020-04-27 | 2020-04-27 | Lens moving mechanism based on piezoelectric drive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010344188.7A CN111308638B (en) | 2020-04-27 | 2020-04-27 | Lens moving mechanism based on piezoelectric drive |
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| CN111308638A true CN111308638A (en) | 2020-06-19 |
| CN111308638B CN111308638B (en) | 2021-08-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113300632A (en) * | 2021-05-13 | 2021-08-24 | 杭州电子科技大学 | Cantilever beam type ultrasonic motor for focusing of optical lens and driving method thereof |
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| KR20160079182A (en) * | 2014-12-26 | 2016-07-06 | 한국기계연구원 | Piezo-driven mechanism and Flexure hinge-based piezo-driven fine stage for vertical planar 3-DOF motion with high load capacity having the same |
| CN109039149A (en) * | 2018-09-10 | 2018-12-18 | 合肥工业大学 | A kind of inertia Linear piezoelectric motor |
| CN110323965A (en) * | 2019-07-17 | 2019-10-11 | 哈尔滨工程大学 | A kind of entire flexible hinge micro displacement magnifying mechanism |
| CN110492781A (en) * | 2019-08-05 | 2019-11-22 | 包头稀土研究院 | Three-level micro displacement magnifying mechanism and its amplification method |
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2020
- 2020-04-27 CN CN202010344188.7A patent/CN111308638B/en active Active
Patent Citations (4)
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| KR20160079182A (en) * | 2014-12-26 | 2016-07-06 | 한국기계연구원 | Piezo-driven mechanism and Flexure hinge-based piezo-driven fine stage for vertical planar 3-DOF motion with high load capacity having the same |
| CN109039149A (en) * | 2018-09-10 | 2018-12-18 | 合肥工业大学 | A kind of inertia Linear piezoelectric motor |
| CN110323965A (en) * | 2019-07-17 | 2019-10-11 | 哈尔滨工程大学 | A kind of entire flexible hinge micro displacement magnifying mechanism |
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| CN113300632A (en) * | 2021-05-13 | 2021-08-24 | 杭州电子科技大学 | Cantilever beam type ultrasonic motor for focusing of optical lens and driving method thereof |
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