CN116974033B - Actuating device, zoom lens and camera - Google Patents
Actuating device, zoom lens and camera Download PDFInfo
- Publication number
- CN116974033B CN116974033B CN202311242088.3A CN202311242088A CN116974033B CN 116974033 B CN116974033 B CN 116974033B CN 202311242088 A CN202311242088 A CN 202311242088A CN 116974033 B CN116974033 B CN 116974033B
- Authority
- CN
- China
- Prior art keywords
- transmission shaft
- stator
- fixed ring
- fixing ring
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 141
- 230000007246 mechanism Effects 0.000 claims abstract description 36
- 230000033001 locomotion Effects 0.000 claims description 30
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 238000013459 approach Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 description 11
- 238000013461 design Methods 0.000 description 9
- 230000008901 benefit Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 230000008602 contraction Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005284 excitation Effects 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
- G03B13/36—Autofocus systems
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses an actuating device, a zoom lens and a camera, which belong to the technical field of zoom lenses and comprise a transmission shaft, a transmission mechanism and a piezoelectric actuating system, wherein the transmission mechanism comprises a first fixed ring, a second fixed ring and a third fixed ring, the first fixed ring is fixedly connected to the transmission shaft, and a plurality of first branch bars are hinged between the first fixed ring and the second fixed ring; a plurality of second branch bars are hinged between the second fixing ring and the third fixing ring; the piezoelectric actuating system is used for driving the transmission shaft to rotate so as to drive the first branch strip to rotate relative to the first fixed ring and drive the second branch strip to rotate relative to the second fixed ring, so that the transmission mechanism is unfolded or folded along the axial direction of the transmission shaft. The actuating device of the invention occupies a smaller volume but can provide a larger moving stroke, and is suitable for lenses requiring a large zoom stroke and miniaturization.
Description
Technical Field
The invention belongs to the technical field of zoom lenses, and particularly relates to an actuating device, a zoom lens and a camera.
Background
The automatic zoom camera device needs to change the focal length by moving the position of the lens by an actuator, so as to realize clear shooting of objects with different distances. Along with the improvement of technology, the application range of the automatic zooming camera device is wider and wider, such as mobile electronic equipment such as mobile phones, tablet computers, microminiature robots, unmanned reconnaissance cameras and the like, and correspondingly, the performance requirement on the automatic zooming camera device is higher and higher.
In the prior art, a lens driving device (chinese patent application, publication No. CN101065957 a) is disclosed, and the prior art discloses that a lens barrel is driven to move by using a screw structure to realize zooming of a lens, however, the design cannot achieve both a zooming stroke and a lens volume, for example, the length of the screw needs to be increased to increase the zooming stroke of the lens, and the lens is limited by the rigidity of the screw, which necessarily leads to the increase of the volume of the lens; for example, in order to reduce the volume of the lens, the zoom stroke of the lens needs to be reduced, so that the design cannot meet the design requirements of a large zoom stroke and a miniaturized lens, and is difficult to apply to the current mobile electronic equipment.
Accordingly, the prior art is subject to improvement and development.
Disclosure of Invention
The invention aims to provide an actuating device, a zoom lens and a camera, which occupy a small volume and can provide a large moving stroke, and are suitable for lenses requiring a large zoom stroke and miniaturization.
In a first aspect, the present invention provides an actuating device applied to a zoom lens, including a transmission shaft, a transmission mechanism, and a piezoelectric actuation system, where the transmission shaft is fixedly connected with the transmission mechanism and is rotatably disposed on the piezoelectric actuation system, and the transmission shaft can rotate around its own axis;
the transmission mechanism comprises a first fixed ring, a second fixed ring and a third fixed ring, wherein the outer diameter of the first fixed ring is smaller than the inner diameter of the second fixed ring, the first fixed ring is fixedly connected to the transmission shaft, a plurality of first support strips are hinged between the first fixed ring and the second fixed ring, and the first support strips can pull the second fixed ring to be close to the first fixed ring or push the second fixed ring to be far away from the first fixed ring when rotating relative to the first fixed ring; the outer diameter of the second fixed ring is smaller than the inner diameter of the third fixed ring, a plurality of second branch strips are hinged between the second fixed ring and the third fixed ring, and the second branch strips can pull the third fixed ring to be close to the second fixed ring or push the third fixed ring to be far away from the second fixed ring when rotating relative to the second fixed ring;
the piezoelectric actuation system is used for driving the transmission shaft to rotate so as to drive the first branch strip to rotate relative to the first fixed ring and drive the second branch strip to rotate relative to the second fixed ring, so that the transmission mechanism is unfolded or folded along the axial direction of the transmission shaft.
The actuating device provided by the invention has the advantages that the transmission mechanism can be unfolded and folded, the whole volume can be greatly reduced during folding, and the actuating device can extend out a larger distance during unfolding, can be applied to a lens, can simultaneously consider the zoom stroke and the volume, and can adapt to the design requirements of a large zoom stroke and a miniaturized lens.
Further, the first branch is hinged with the first fixing ring and the second fixing ring through ball-head hinges; the second branch is hinged with the second fixing ring and the third fixing ring through ball-head hinges;
when the transmission shaft rotates around the axis of the transmission shaft, the first branch strip and the second branch strip rotate so as to enable the second fixed ring and the third fixed ring to synchronously approach or separate from the first fixed ring.
The ball head hinge can enable the first branch and the second branch to act more smoothly and flexibly, and is beneficial to the quick expansion and contraction of the transmission mechanism.
Further, the first branch is hinged with the first fixing ring and the second fixing ring through flexible hinges; the second branch is hinged with the second fixing ring and the third fixing ring through flexible hinges.
The flexible hinge can enable the movement of the first branch and the second branch to be more sensitive, is beneficial to improving the control precision and realizes high-precision control.
Further, the first fixing ring, the second fixing ring, the third fixing ring, the first branch strip and the second branch strip are integrally processed.
Further, the piezoelectric actuation system comprises at least one stator made of piezoelectric material, wherein an arc surface is arranged on the stator, and is provided with a convex contact part which is in contact with the peripheral surface of the transmission shaft; the stator is used for generating vibration when being excited by an electric signal so as to enable the corresponding contact part to do elliptic motion to drive the transmission shaft to rotate around the axis of the transmission shaft.
Further, the piezoelectric actuation system includes two stators, and the two stators are respectively:
the first stator is provided with a first cambered surface, the first cambered surface is provided with a first protruding contact part, and the first contact part is in contact with the peripheral surface of the transmission shaft; the first stator is used for generating vibration when being excited by an electric signal so as to enable the first contact part to make elliptical motion;
the second stator is provided with a second cambered surface, the second cambered surface is provided with a convex second contact part, and the second contact part is in contact with the peripheral surface of the transmission shaft; the second cambered surface and the first cambered surface are surrounded into a circle; the second stator is used for generating vibration when being excited by an electric signal so as to enable the second contact part to perform elliptical motion and drive the transmission shaft to rotate around the axis of the transmission shaft in cooperation with the elliptical motion of the first contact part.
Only set up two stators and can control the transmission shaft rotation, realize that the structure is simplified, reduce whole weight, reach lighter effect, also reduce the control degree of difficulty simultaneously.
Further, the first cambered surface semi-surrounds the transmission shaft along the circumferential direction of the transmission shaft, and the first contact part is in contact with the outer circumferential surface of the transmission shaft;
the second cambered surface and the first cambered surface fully surround the transmission shaft along the circumferential direction of the transmission shaft, and the second contact part is in contact with the outer circumferential surface of the transmission shaft.
Further, a first elastic element and a second elastic element are arranged on the stator, the first elastic element is located on one side, provided with the cambered surface, of the stator, the second elastic element is located on one side, away from the first elastic element, of the stator, and the first elastic element and the second elastic element are both used for providing elastic force for the stator so that the contact portion keeps contact with the peripheral surface of the transmission shaft.
In a second aspect, the present invention provides a zoom lens, applied to a camera, comprising an actuating device, a lens mount, a first lens barrel, a second lens barrel, and a third lens barrel as described above;
the stator of the piezoelectric actuation system is fixed in the lens seat through a first elastic element and a second elastic element;
the first lens cone is fixedly connected to the lens base, is coaxial with the first fixing ring and surrounds the first fixing ring;
the second lens barrel is sleeved on the first lens barrel and surrounds the second fixing ring;
the third lens cone is sleeved on the second lens cone and surrounds the third fixing ring, and the third lens cone is fixedly connected with the third fixing ring, and a lens is installed at one end, far away from the second lens cone.
The actuating device can realize continuous movement of the lens barrel, and can realize electrodeless focusing function and outage self-locking function of the lens barrel as the actuating device, so that not only can various focal lengths be adjusted in the stroke of the lens barrel, but also the focal length can be timely outage after adjustment, and the electric energy can be saved.
In a third aspect, the present invention provides a camera comprising a zoom lens as described above.
The zoom lens has the advantages of quick focusing response, high focusing precision, mute operation, strong environmental adaptability, simple structure, strong retractility, long zooming stroke and high zooming speed.
The actuating device provided by the invention has the advantages that the transmission mechanism can be completely folded under the condition of proper design, so that the whole actuating device occupies only a very small space, meanwhile, the transmission mechanism can be unfolded for a larger distance, and when the actuating device is applied to a lens, the actuating device is beneficial to the miniaturization design of the lens, can also maintain or improve the zoom stroke, and is suitable for various mobile electronic equipment with the requirements on the zoom stroke and the volume nowadays.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be apparent from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
Fig. 1 is a partial structural cross-sectional view of a zoom lens according to an embodiment of the present invention.
Fig. 2 is an assembly view of a drive shaft and a drive mechanism in an embodiment of the invention.
Fig. 3 is an integrally formed processing schematic diagram of a transmission mechanism according to an embodiment of the present invention.
Fig. 4 is an exploded view of the first barrel, the second barrel, and the third barrel according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of two resonance modes generated by a stator according to an embodiment of the present invention.
Fig. 6 is a schematic diagram illustrating a movement direction of the first contact portion when the first stator is excited to vibrate to rotate the transmission shaft clockwise in the embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating a movement direction of the second contact portion when the second stator is excited to vibrate to rotate the transmission shaft counterclockwise in an embodiment of the present invention.
Description of the reference numerals: 100. a transmission shaft; 200. a piezoelectric actuation system; 210. a first stator; 211. a first cambered surface; 212. a first contact portion; 220. a second stator; 221. a second cambered surface; 222. a second contact portion; 230. a first elastic element; 240. a second elastic element; 310. a first fixing ring; 320. a second fixing ring; 330. a third fixing ring; 340. a first branch; 350. a second branch; 400. a lens base; 500. a first barrel; 600. a second barrel; 700. a third barrel; 710. a lens.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically connected, electrically connected or can be communicated with each other; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
Referring to fig. 1, 2 and 3, the present invention provides an actuating device applied to a zoom lens, including a transmission shaft 100, a transmission mechanism and a piezoelectric actuating system 200, wherein the transmission shaft 100 is fixedly connected with the transmission mechanism and rotatably disposed on the piezoelectric actuating system 200, and the transmission shaft 100 can rotate around its own axis;
the transmission mechanism comprises a first fixed ring 310, a second fixed ring 320 and a third fixed ring 330, wherein the outer diameter of the first fixed ring 310 is smaller than the inner diameter of the second fixed ring 320, the first fixed ring 310 is fixedly connected to the transmission shaft 100, a plurality of first branch strips 340 are hinged between the first fixed ring 310 and the second fixed ring 320, and the first branch strips 340 can pull the second fixed ring 320 to be close to the first fixed ring 310 or push the second fixed ring 320 to be far away from the first fixed ring 310 when rotating relative to the first fixed ring 310; the outer diameter of the second fixing ring 320 is smaller than the inner diameter of the third fixing ring 330, a plurality of second branch strips 350 are hinged between the second fixing ring 320 and the third fixing ring 330, and the second branch strips 350 can pull the third fixing ring 330 to be close to the second fixing ring 320 or push the third fixing ring 330 to be far away from the second fixing ring 320 when rotating relative to the second fixing ring 320;
the piezoelectric actuation system 200 is configured to drive the transmission shaft 100 to rotate, thereby driving the first branch 340 to rotate relative to the first fixed ring 310 and driving the second branch 350 to rotate relative to the second fixed ring 320, so as to enable the transmission mechanism to be unfolded or folded along the axial direction of the transmission shaft 100.
In this embodiment, when the transmission shaft 100 rotates, the included angle between the first fixing ring 310 and the first supporting strip 340 changes, so as to drive the second fixing ring 320 to rotate and to approach or separate from the first fixing ring 310 along the axial direction of the transmission shaft 100, and when the second fixing ring 320 rotates, the included angle between the second fixing ring 320 and the second supporting strip 350 changes, and when the third fixing ring 330 is limited to rotate, the third fixing ring 330 can approach or separate from the second fixing ring 320 along the axial direction of the transmission shaft 100 under the action of the traction or pushing force of the second supporting strip 350, so as to realize the extension and retraction of the transmission mechanism.
Because the outer diameter of the first fixing ring 310 is smaller than the inner diameter of the second fixing ring 320, in the case of proper design, the first branch 340 can rotate to be in the same plane with the first fixing ring 310, and at this time, the second fixing ring 320 encloses the first branch 340 and the first fixing ring 310 and is in the same plane with the first fixing ring 310; similarly, since the outer diameter of the second fixing ring 320 is smaller than the inner diameter of the third fixing ring 330, the second branch 350 can rotate to be in the same plane with the second fixing ring 320, and the third fixing ring 330 encloses the second branch 350 and the second fixing ring 320 and is in the same plane with the second fixing ring 320; at this time, the whole transmission mechanism is folded into a plane, the volume is reduced to the greatest extent, only the space of the plane is occupied, and when the transmission mechanism is unfolded, the maximum extension length=the length of the first branch strip+the length of the second branch strip, so that the transmission mechanism has the characteristics of small volume and large variation stroke, and is beneficial to miniaturization and light and thin.
In certain embodiments, referring to fig. 1, 2 and 3, the first branch 340 is hinged to the first and second fixing rings 310 and 320 by a ball-head hinge; the second branch 350 is hinged with the second fixing ring 320 and the third fixing ring 330 through ball joints;
as the drive shaft 100 rotates about its own axis, the first and second branches 340 and 350 rotate to synchronize the second and third fixed rings 320 and 330 toward or away from the first fixed ring 310.
In this embodiment, the ball-head hinge can meet the angle change and the position change of the first support strip 340 and the second support strip 350, and can make the first support strip 340 and the second support strip 350 obtain a larger moving range, which is beneficial to realizing folding the transmission mechanism into a plane and unfolding the transmission mechanism to reach the maximum extension length; meanwhile, the ball-head hinge can enable the first support strip 340 and the second support strip 350 to act more smoothly and flexibly, and is beneficial to the quick expansion and contraction of the transmission mechanism.
In certain embodiments, referring to fig. 1, 2 and 3, the first branch 340 is hinged to the first and second fixing rings 310 and 320 by a flexible hinge; the second branch 350 is hinged to the second fixing ring 320 and the third fixing ring 330 by flexible hinges.
In this embodiment, the flexible hinge has the characteristics of no friction, no gap, small space size, easy control, high motion sensitivity, and the like, and can make the first support strip 340 and the second support strip 350 obtain a larger moving range, which is beneficial to realizing folding the transmission mechanism into a plane and unfolding the transmission mechanism to reach the maximum extension length; meanwhile, the flexible hinge can enable the first branch 340 and the second branch 350 to act more smoothly and flexibly, is beneficial to the transmission mechanism to realize rapid expansion and contraction, and can enable the first branch 340 and the second branch 350 to move more sensitively, is beneficial to improving control precision and realizes high-precision control.
In certain embodiments, referring to fig. 3, the first securing ring 310, the second securing ring 320, the third securing ring 330, the first branch 340, and the second branch 350 are integrally formed.
As described above, in the case of proper design, the transmission mechanism can be folded into a plane, and when the flexible hinge is used to connect the first supporting strip 340 and the second supporting strip 350, the elastic sheet on a plane can be processed by the hollow processing technology, so as to obtain the transmission mechanism formed by integral processing, the processing process is simple, the manufacturing cost of the finished product is low, and the miniaturization and the thinning are facilitated.
In certain embodiments, referring to fig. 1, 5, 6 and 7, the piezoelectric actuation system 200 includes at least one stator made of piezoelectric material, on which an arc surface is provided, the arc surface being provided with a protruding contact portion that contacts the peripheral surface of the transmission shaft 100; the stator is adapted to vibrate when excited by an electrical signal to impart an elliptical motion to the corresponding contact portion to drive the drive shaft 100 to rotate about its own axis.
In this embodiment, the stator may be a piece of high-strength piezoelectric ceramic, or may be a composite of a piece of metal and a piezoelectric material.
The stator is equivalent to a piezoelectric motor, and when an electric signal is input to the stator, the stator generates two resonance modes, wherein the first mode provides vibration in the vertical direction for the contact part (mode 1), and the second mode provides vibration in the horizontal direction for the contact part (mode 2); when the input electric signal is excited by the same-frequency sinusoidal signal with pi/2 phase difference, the two vibration modes drive the contact part to circularly move and present an elliptical motion track, and at the moment, the transmission shaft 100 is contacted with the contact part and realizes rotation around the axis of the transmission shaft under the action of contact friction force.
Specifically, for example, when the input electric signal is excited by a same-frequency sinusoidal signal with pi/2 phase difference, the contact portion forms an elliptical motion along the clockwise direction, and then the transmission shaft 100 is driven to rotate along the counterclockwise direction; when the input electric signal is excited by the same-frequency sinusoidal signal with a phase difference of-pi/2, the contact part forms an elliptical motion along the anticlockwise direction, and at the moment, the transmission shaft 100 is driven to rotate along the clockwise direction; this realizes forward and reverse rotation of the transmission shaft 100, thereby realizing control of the expansion and contraction of the transmission mechanism.
In some embodiments, the piezoelectric actuation system 200 includes a stator, and in practice, an elastic block may be disposed on a side opposite to the stator, where the elastic block abuts against the driving shaft 100 and drives the driving shaft 100 to press in a direction toward the stator, where the elastic block and the stator have an effect of providing positive pressure to the driving shaft 100, which is beneficial to prevent the driving shaft 100 from being separated from the stator, and to ensure that the contact portion is kept in contact with the driving shaft 100.
In certain embodiments, piezoelectric actuation system 200 comprises a plurality of stators made of piezoelectric material, a plurality of cambered surfaces surrounding a circle; when the stator is excited by the electric signal, the stator vibrates to make the corresponding contact part perform elliptical motion and drive the transmission shaft 100 to rotate around the axis of the transmission shaft in cooperation with the elliptical motion of other contact parts.
In certain preferred embodiments, and with reference to fig. 1, 6 and 7, the piezoelectric actuation system 200 comprises two stators, one for each:
the first stator 210, the first stator 210 is provided with a first cambered surface 211, the first cambered surface 211 is provided with a first protruding contact part 212, and the first contact part 212 is in contact with the peripheral surface of the transmission shaft 100; the first stator 210 is configured to generate vibration when excited by an electrical signal to make the first contact 212 perform an elliptical motion;
the second stator 220, the second stator 220 is provided with a second cambered surface 221, the second cambered surface 221 is provided with a convex second contact part 222, and the second contact part 222 is contacted with the peripheral surface of the transmission shaft 100; the second cambered surface 221 surrounds the first cambered surface 211 to form a circle; the second stator 220 is configured to vibrate when excited by an electrical signal to cause the second contact portion 222 to perform an elliptical motion and to drive the drive shaft 100 to rotate about its own axis in coordination with the elliptical motion of the first contact portion 212.
In this embodiment, only two stators are provided to control the rotation of the transmission shaft 100, so as to simplify the structure, reduce the overall weight, achieve a lighter effect, and reduce the control difficulty.
In practical application, a user can realize the following driving modes by controlling the input of the electric signals:
first, only the first stator 210 or the second stator 220 is used to drive the transmission shaft to rotate:
for example, by inputting only the same-frequency sinusoidal signal excitation with a phase difference of pi/2 to the first stator 210, the first contact portion 212 performs an elliptical motion in the clockwise direction, and the transmission shaft 100 is rotated in the counterclockwise direction; only the first stator 210 is excited by the same-frequency sine signal with the phase difference of-pi/2, so that the first contact portion 212 performs elliptical motion in the counterclockwise direction, and the transmission shaft 100 rotates in the clockwise direction; while the second stator 220 only serves to provide positive pressure to the drive shaft 100 and does not serve as a drive; otherwise, the same procedure is not repeated here.
Second, the first stator 210 and the second stator 220 are simultaneously used to drive the rotation of the transmission shaft:
for example, the first stator 210 and the second stator 220 are both excited by the same-frequency sinusoidal signal with pi/2 phase difference, so that the first contact portion 212 and the second contact portion 222 perform elliptical motion in the clockwise direction, and the transmission shaft 100 rotates in the counterclockwise direction; the first stator 210 and the second stator 220 are both excited by the same-frequency sinusoidal signal with the phase difference of-pi/2, so that the first contact portion 212 and the second contact portion 222 perform elliptical motion in the counterclockwise direction, and the transmission shaft 100 is rotated in the clockwise direction;
third, the first stator 210 and the second stator 220 are used to drive the transmission shaft to rotate, respectively:
for example, when the first stator 210 is excited by the same-frequency sinusoidal signal with a phase difference of pi/2, the first contact portion 212 performs an elliptical motion in a clockwise direction, so that the transmission shaft 100 rotates in a counterclockwise direction; the second stator 220 is excited by the same-frequency sine signal with the phase difference of-pi/2, so that the second contact part 222 performs elliptical motion in the counterclockwise direction, and the transmission shaft 100 rotates in the clockwise direction; otherwise, the same procedure is not repeated here.
In the above three driving modes, when the driving shaft 100 changes the rotation direction each time, the first driving mode and the second driving mode need to switch the electric signals, in contrast, in the third driving mode, since the first stator 210 and the second stator 220 control one rotation direction of the driving shaft 100, the electric signals of the first stator 210 and the second stator 220 do not need to be switched, and the difficulty in controlling the input of the electric signals is reduced.
In a further preferred embodiment, only one stator is provided to control the rotation of the drive shaft 100.
For example, on the basis of the above embodiment, the second stator 220 is omitted, and only the same-frequency sinusoidal signal excitation with the phase difference pi/2 is input to the first stator 210, so that the first contact portion 212 performs an elliptical motion in the clockwise direction, and the transmission shaft 100 is rotated in the counterclockwise direction; only the first stator 210 is excited by the same-frequency sine signal with the phase difference of-pi/2, so that the first contact portion 212 performs elliptical motion in the counterclockwise direction, and the transmission shaft 100 rotates in the clockwise direction; otherwise, the same procedure is not repeated here.
In some embodiments, the transmission shaft 100 is specifically a cylinder, and the plurality of cambered surfaces are surrounded into a circle so as to be arranged coaxially with the transmission shaft 100, so that the overall structure of the piezoelectric actuation system 200 is more compact in cooperation with the transmission shaft 100, the space of the piezoelectric actuation system 200 can be effectively utilized, the utilization efficiency of the internal space of the piezoelectric actuation system 200 is improved, the piezoelectric actuation system 200 is miniaturized and thinned, and meanwhile, all contact parts are beneficial to keeping contact with the transmission shaft 100, and the contact parts can be located inside the transmission shaft 100 to contact with the inner peripheral surface of the transmission shaft 100 or located outside the transmission shaft 100 to contact with the outer peripheral surface of the transmission shaft 100.
In certain embodiments, referring to fig. 1, 6 and 7, the first cambered surface 211 semi-surrounds the drive shaft 100 in the circumferential direction of the drive shaft 100 and the first contact portion 212 contacts the outer circumferential surface of the drive shaft 100;
the second arc surface 221 and the first arc surface 211 fully surround the drive shaft 100 in the circumferential direction of the drive shaft 100 and the second contact portion 222 contacts the outer circumferential surface of the drive shaft 100.
In this embodiment, the first cambered surface 211 and the second cambered surface 221 are located outside the transmission shaft 100 and fully surround the transmission shaft 100, and the first contact portion 212 and the second contact portion 222 contact the outer peripheral surface of the transmission shaft 100 to drive the transmission shaft 100 to rotate, so that a design user can observe the assembly condition among the first stator 210, the second stator 220 and the transmission shaft 100 more easily, and the assembly and the disassembly of the user are facilitated.
In some embodiments, referring to fig. 1, 6 and 7, a first elastic element 230 and a second elastic element 240 are provided on the stator, the first elastic element 230 is located on a side of the stator where the cambered surface is provided, the second elastic element 240 is located on a side of the stator away from the first elastic element 230, and each of the first elastic element 230 and the second elastic element 240 is used to provide an elastic force to the stator to keep the contact portion in contact with the circumferential surface of the transmission shaft 100.
In this embodiment, the first elastic element 230 is specifically a serpentine structure, such as a reed, and the second elastic element 240 is a cylindrical structure, such as a spring, and the first elastic element 230 and the second elastic element 240 can limit the position of the stator and provide elastic force for the stator to keep the contact portion in contact with the circumferential surface of the transmission shaft 100.
Referring to fig. 1 and 4, the present invention provides a zoom lens, which is applied to a camera, including an actuating device, a lens mount 400, a first barrel 500, a second barrel 600, and a third barrel 700 in the above-described embodiments;
the stator of the piezoelectric actuation system 200 is fixed in the lens mount 400 by the first elastic element 230 and the second elastic element 240;
the first lens barrel 500 is fixedly connected to the lens holder 400, and the first lens barrel 500 is coaxial with the first fixing ring 310 and surrounds the first fixing ring 310;
the second barrel 600 is sleeved on the first barrel 500 and surrounds the second fixing ring 320;
the third lens barrel 700 is sleeved on the second lens barrel 600 and surrounds the third fixing ring 330, the third lens barrel 700 is fixedly connected with the third fixing ring 330, and a lens 710 is installed at one end far away from the second lens barrel 600.
In this embodiment, the outer circumferential surface of the first lens barrel 500 and the outer circumferential surface of the second lens barrel 600 are provided with bosses, the inner circumferential surface of the second lens barrel 600 and the inner circumferential surface of the third lens barrel 700 are provided with grooves, and the second lens barrel 600 and the third lens barrel 700 are limited and guided by the cooperation of the bosses and the grooves in a sliding manner.
It should be noted that, the first barrel 500 is fixed on the lens base 400 and cannot rotate and move, and the second barrel 600 and the third barrel 700 can only move in the axial direction of the transmission shaft 100 but cannot rotate under the interaction of the boss and the groove.
The third lens barrel 700 is fixedly connected with the third fixing ring 330, and the third lens barrel 700 cannot rotate due to the limiting effect of the boss of the second lens barrel 600, when the transmission shaft 100 rotates, the third lens barrel 700 can only move along the axial direction of the transmission shaft 100 (meanwhile, the second lens barrel 600 is driven to move along the axial direction of the transmission shaft 100 under the limiting effect of the groove), so that the lens zoom is realized.
The stator takes the friction force between the contact part and the transmission shaft 100 as driving force and self-locking force, when the stator is excited, the friction force between the contact part and the transmission shaft 100 is driving force, the transmission shaft 100 is driven to rotate, and the transmission mechanism is further driven to move so as to realize the extension and retraction of the lens barrel; when the excitation is stopped, the friction force between the contact part and the transmission shaft 100 is a self-locking force, so that the lens barrel is kept still, the actuating device realizes the stepless focusing function and the outage self-locking function of the lens barrel, not only can realize the adjustment of various focal lengths in the stroke of the actuating device, but also can timely outage after the adjustment, keep the focal length unchanged, and save electric energy.
In some embodiments, referring to fig. 1 and 2, an annular boss is provided on an outer circumferential surface of the transmission shaft 100, through which the transmission shaft 100 is embedded on the lens holder 400; the annular boss can limit the transmission shaft 100 on the lens holder 400 but does not affect the rotation of the transmission shaft 100, so that the transmission shaft 100 can only rotate in a sliding manner and cannot move along the axial direction.
The invention provides a camera, which comprises the zoom lens in the embodiment, and has the following advantages:
1. the focusing response is fast: when the stator is excited by the electric signal, the starting can be completed within tens of milliseconds; when the excitation signal stops, the braking and self-locking can be completed within tens of milliseconds. The actuating device takes the stator as a driving motor, and can finish starting and braking in tens of milliseconds.
2. Focusing precision is high: the vibration of the stator is in micro-nano level, the displacement resolution can reach micro-nano level, so that the positioning accuracy of the actuating device can reach micro-nano level under the condition of no sensor (under the condition of an open loop control system).
3. And (3) mute operation: the working frequency of the stator is in the ultrasonic frequency domain (> 20 kHz) and exceeds the hearing range of the human ear, so that the stator has no noise pollution during working for users.
4. The environmental adaptability is strong: the stator is piezoelectric ceramic or a composite body formed by combining the piezoelectric ceramic and metal, the influence of the environment on the performances of the materials is small, the stator is not influenced by electromagnetic interference and other severe environments, and the stator can normally work even under severe environments such as-40-80 ℃ and strong magnetism, nuclear radiation or moisture, salt fog and the like, so that the requirements of users on the performances are better met.
5. Simple structure, strong scalability, long zoom stroke and fast zoom speed: the actuating device has a light structure, the transmission mechanism is used, the retraction of a plurality of lens barrels (> 3 levels) can be realized only by a single driving force (only three lens barrels are drawn in the figure, theoretically more levels of lens barrels can be pushed, only the first level fixing ring is fixed on the transmission shaft, the last level fixing ring is fixed on the last level lens barrel, the middle part can be provided with a plurality of levels of fixing rings and branch bars), and compared with the existing camera zooming technology (only one lens barrel can be telescopic by a single driving force), the zooming device has long zooming stroke and high zooming speed.
In the description of the present specification, reference to the terms "one embodiment," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
What has been described above is merely some embodiments of the present invention. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit of the invention.
Claims (8)
1. An actuating device is applied to a zoom lens and is characterized by comprising a transmission shaft (100), a transmission mechanism and a piezoelectric actuating system (200), wherein the transmission shaft (100) is fixedly connected with the transmission mechanism and is rotatably arranged on the piezoelectric actuating system (200), and the transmission shaft (100) can rotate around an axis of the transmission shaft;
the transmission mechanism comprises a first fixed ring (310), a second fixed ring (320) and a third fixed ring (330), wherein the outer diameter of the first fixed ring (310) is smaller than the inner diameter of the second fixed ring (320), the first fixed ring (310) is fixedly connected to the transmission shaft (100), a plurality of first branch strips (340) are hinged between the first fixed ring (310) and the second fixed ring (320), and the first branch strips (340) can pull the second fixed ring (320) to be close to the first fixed ring (310) or push the second fixed ring (320) to be far away from the first fixed ring (310) when rotating relative to the first fixed ring (310); the outer diameter of the second fixing ring (320) is smaller than the inner diameter of the third fixing ring (330), a plurality of second branch strips (350) are hinged between the second fixing ring (320) and the third fixing ring (330), and the second branch strips (350) can pull the third fixing ring (330) to be close to the second fixing ring (320) or push the third fixing ring (330) to be far away from the second fixing ring (320) when rotating relative to the second fixing ring (320);
the piezoelectric actuation system (200) is used for driving the transmission shaft (100) to rotate so as to drive the first branch strip (340) to rotate relative to the first fixed ring (310) and drive the second branch strip (350) to rotate relative to the second fixed ring (320), so that the transmission mechanism is unfolded or folded along the axial direction of the transmission shaft (100);
the piezoelectric actuation system (200) comprises at least one stator made of piezoelectric material, wherein an arc surface is arranged on the stator, and is provided with a convex contact part which is in contact with the peripheral surface of the transmission shaft (100); the stator is used for generating vibration when being excited by an electric signal so as to enable the corresponding contact part to perform elliptical motion to drive the transmission shaft (100) to rotate around the axis of the transmission shaft;
the piezoelectric actuation system (200) comprises two stators, which are respectively:
the first stator (210), a first cambered surface (211) is arranged on the first stator (210), a first protruding contact part (212) is arranged on the first cambered surface (211), and the first contact part (212) is in contact with the peripheral surface of the transmission shaft (100); the first stator (210) is configured to generate vibrations when excited by an electrical signal to cause the first contact (212) to perform an elliptical motion;
a second stator (220), wherein a second cambered surface (221) is arranged on the second stator (220), the second cambered surface (221) is provided with a convex second contact part (222), and the second contact part (222) is in contact with the peripheral surface of the transmission shaft (100); the second cambered surface (221) and the first cambered surface (211) are surrounded into a circle; the second stator (220) is configured to vibrate when excited by an electrical signal to cause the second contact (222) to perform an elliptical motion and to drive the drive shaft (100) to rotate about its own axis in coordination with the elliptical motion of the first contact (212).
2. The actuation device according to claim 1, characterized in that the first branch (340) is hinged to the first fixing ring (310) and the second fixing ring (320) by means of a ball-head hinge; the second branch strip (350) is hinged with the second fixing ring (320) and the third fixing ring (330) through ball-head hinges;
when the transmission shaft (100) rotates around the self axis, the first branch strip (340) and the second branch strip (350) rotate so as to enable the second fixed ring (320) and the third fixed ring (330) to synchronously approach or separate from the first fixed ring (310).
3. The actuation device according to claim 1, characterized in that the first branch (340) is hinged to the first and second fixed rings (310, 320) by a flexible hinge; the second branch (350) is hinged with the second fixing ring (320) and the third fixing ring (330) through flexible hinges.
4. An actuating device according to claim 3, characterized in that the first securing ring (310), the second securing ring (320), the third securing ring (330), the first branch (340) and the second branch (350) are integrally machined.
5. The actuation device according to claim 1, characterized in that the first cambered surface (211) partly surrounds the drive shaft (100) in the circumferential direction of the drive shaft (100) and the first contact portion (212) is in contact with the outer circumferential surface of the drive shaft (100);
the second cambered surface (221) and the first cambered surface (211) fully surround the transmission shaft (100) along the circumferential direction of the transmission shaft (100), and the second contact part (222) is in contact with the outer circumferential surface of the transmission shaft (100).
6. The actuating device according to claim 1, characterized in that a first elastic element (230) and a second elastic element (240) are provided on the stator, the first elastic element (230) being located on the side of the stator where the cambered surface is provided, the second elastic element (240) being located on the side of the stator remote from the first elastic element (230), the first elastic element (230) and the second elastic element (240) each being arranged to provide an elastic force for the stator to keep the contact portion in contact with the circumferential surface of the drive shaft (100).
7. A zoom lens applied to a camera, characterized by comprising an actuating device as claimed in any one of the preceding claims 1-6, a lens mount (400), a first barrel (500), a second barrel (600) and a third barrel (700);
the stator of the piezoelectric actuation system (200) is fixed in the lens base (400) through a first elastic element (230) and a second elastic element (240);
the first lens barrel (500) is fixedly connected to the lens base (400), and the first lens barrel (500) is coaxial with the first fixed ring (310) and surrounds the first fixed ring (310);
the second lens barrel (600) is sleeved on the first lens barrel (500) and surrounds the second fixing ring (320);
the third lens cone (700) is sleeved on the second lens cone (600) and surrounds the third fixing ring (330), and the third lens cone (700) is fixedly connected with the third fixing ring (330) and is far away from one end of the second lens cone (600) to be provided with a lens (710).
8. A camera comprising a zoom lens as claimed in claim 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311242088.3A CN116974033B (en) | 2023-09-25 | 2023-09-25 | Actuating device, zoom lens and camera |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311242088.3A CN116974033B (en) | 2023-09-25 | 2023-09-25 | Actuating device, zoom lens and camera |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116974033A CN116974033A (en) | 2023-10-31 |
| CN116974033B true CN116974033B (en) | 2023-12-15 |
Family
ID=88477148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311242088.3A Active CN116974033B (en) | 2023-09-25 | 2023-09-25 | Actuating device, zoom lens and camera |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116974033B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8423812D0 (en) * | 1984-09-20 | 1984-10-24 | Hodges P | Lens hood |
| JP2008020813A (en) * | 2006-07-14 | 2008-01-31 | Konica Minolta Opto Inc | Lens driving mechanism and imaging apparatus using same |
| CN102636860A (en) * | 2011-02-11 | 2012-08-15 | 三星电子株式会社 | A zoom lens barrel assembly with inlet portion formed in a first zoom ring |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7475437B2 (en) * | 2019-10-03 | 2024-04-26 | アクチュエーター・ソリュ―ションズ・ゲーエムベーハー | Cylindrical actuator subassembly with flexure-based linear guide mechanism |
-
2023
- 2023-09-25 CN CN202311242088.3A patent/CN116974033B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8423812D0 (en) * | 1984-09-20 | 1984-10-24 | Hodges P | Lens hood |
| JP2008020813A (en) * | 2006-07-14 | 2008-01-31 | Konica Minolta Opto Inc | Lens driving mechanism and imaging apparatus using same |
| CN102636860A (en) * | 2011-02-11 | 2012-08-15 | 三星电子株式会社 | A zoom lens barrel assembly with inlet portion formed in a first zoom ring |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116974033A (en) | 2023-10-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210781015U (en) | Camera module and electronic equipment | |
| FI118866B (en) | Lens drive | |
| US6078438A (en) | Vibration actuator and lens barrel | |
| US7777969B2 (en) | Camera module and portable terminal employing the same | |
| US20060113867A1 (en) | Vibration wave motor | |
| JP4509084B2 (en) | Lens transfer device | |
| CN101872057B (en) | Focusing structure and lens module group with same | |
| US7446965B2 (en) | Optical focusing device | |
| US20030227559A1 (en) | Piezoelectric actuator for digital camera optical system | |
| CN201075845Y (en) | Screwed cap type ultrasound electric machine | |
| US7732980B2 (en) | Electromechanical conversion element, vibration actuator, vibration actuator driving device, lens barrel and camera | |
| CN112911092A (en) | Camera module and electronic equipment | |
| CN218917760U (en) | Lens driving device | |
| CN116974033B (en) | Actuating device, zoom lens and camera | |
| CN101165524B (en) | Piezoelectric drive optical lens | |
| CN112242785A (en) | Linear motor, lens assembly and electronic equipment | |
| CN100437329C (en) | Micro-ultrasonic motor mobile phone quickcam image focusing structure | |
| JP2013229997A (en) | Vibration actuator, optical apparatus, and assembling method of vibration actuator | |
| CN116974032B (en) | Piezoelectric-driven stepless zoom lens and camera | |
| EP0812024A2 (en) | Multi-functional ultrasonic motor and apparatus using the same | |
| JP2735179B2 (en) | Drive device using ultrasonic motor | |
| WO2022143651A1 (en) | Piezoelectric motor, camera module, and electronic device | |
| JP4078466B2 (en) | Vibration actuator driving device and lens barrel | |
| JP2006101593A (en) | Reciprocating drive mechanism and optical device using the same | |
| JP4623714B2 (en) | Camera module and portable terminal using the camera module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |