US20100073787A1 - Piezoelectric-driving optical lens - Google Patents
Piezoelectric-driving optical lens Download PDFInfo
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- US20100073787A1 US20100073787A1 US12/629,528 US62952809A US2010073787A1 US 20100073787 A1 US20100073787 A1 US 20100073787A1 US 62952809 A US62952809 A US 62952809A US 2010073787 A1 US2010073787 A1 US 2010073787A1
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- piezoelectric
- lens
- optical lens
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- friction ring
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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
- G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
-
- 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
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
Definitions
- the present invention relates to piezoelectric-driving optical lens, and more particularly, to an optical lens capable of being driven to rotate by piezoelectric stators for focusing or zooming. It is suitable for various lens-related applications, such as video conference systems, monitor systems, conventional cameras, digital cameras and camera phones, as it is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- ultrasonic motors also known as piezoelectric motors
- other piezoelectric actuators are commonly used in conventional cameras, digital cameras and camera phones, that are functioned as the drives of optical lenses for focusing the same and are becoming one of the most important elements for optical products.
- One such example is the Helimorph® piezoelectric actuator of 1 Ltd., England. It is a coil-like bimorph piezoelectric ceramic actuator.
- the actuators have some properties of compact, low power consumption, silent operation and high displacement to act as the mechanism for focussing.
- the aforesaid prior-art piezoelectric motors are becoming too bulky and no longer suitable to fit in those two products since the sizes of the two are usually smaller that that of a conventional camera.
- the size of the prior-art optical lens module is the major restriction preventing the miniaturization of digital camera and camera phone.
- FIG. 1 is an exploded perspective view of an piezoelectric lens assembly, disclosed in U.S. Pat. No. 6,710,950, entitled “Piezoelectric actuator for digital camera optical system”.
- the lens assembly as shown in FIG. 1 , consists of a support tube 9 and a lens tube 10 .
- Lens tube 10 holds the lens and is mounted coaxially within support tube 9 while being supported within the support tube 9 for movement in an axial direction.
- the circuit board for the piezoelectric drive is a flexible printed circuit board 14 arranged about the outer cylindrical surface 15 of the support tube 9 .
- a plurality of piezoelectric elements, as the piezoelectric element 11 illustrated in FIG. 1 , and their associated components are connected and supported directly by the flexible circuit board 14 .
- the assembly of flexible circuit board and a resilient insulating sheet 15 is held in place on support tube 9 by a split ring shaped spring 16 .
- Support and motion for the lens tube 10 is provided by the plural piezoelectric elements.
- the autofocus capability of the lens assembly is entirely dependent on the displacement of the lens tube 10 , and consequently, it is bulky and difficult to provide an accurate circuit control.
- FIG. 2 is a perspective view of a lens driving device, disclosed in U.S. Pat. No. 6,853,507, entitled “Lens driving device”.
- the cylindrical stationary barrel 7 is mounted on the base 35 while the cylindrical rotary barrel 6 , also mounted on the base 35 , is disposed surrounding the stationary barrel 7 .
- the focus lens 1 fitted in a lens frame 3 , is movably mounted within the stationary barrel 7 in a manner that the bosses 11 thereof are projected outward.
- the barrels 6 and 7 are provided with the linear guide slots 6 a and 7 a for receiving the bosses 11 so that the lens 1 may be shift forward and backward along the guide slots 6 a and 7 a .
- the driving member 30 also mounted on the base 35 while enabling its teeth-like segments 31 to be arranged substantially adjoining the barrel 6 so that the segments are in contact with the barrel 6 .
- the piezoelectric actuator 10 being arranged in the form of a ring around the rotary barrel 6 , is contracted or expanded radially in response to an input signal from the outside.
- the drive member 30 is driven to repeat contraction and restoration in response to radial contraction of the piezoelectric actuator 10 , pushing the inclined segments 31 outward, so that the segments 31 rotate the rotary barrel 6 along the inclination of the segments 31 and thus drive the lens 1 to move axially inside the stationary barrel 7 .
- the cost of the lens driving device is expensive since the structure of aforesaid lens driving device is still very complicated, not to mention the difficulty of manufacturing the driving member 30 , and the piezoelectric actuator 10 must be polarized in segment.
- FIG. 3 shows a lens driving apparatus, disclosed in Korea Pat. Appl. No. 1020040078265, entitled “Transfer unit, in which a lens and an actuator are formed in one body”.
- the lens driving device is substantially a cylinder 19 having a guide rod 12 , a piezoelectric member 13 and a supporting block 14 arranged therein.
- certain mass is required in the aforesaid lens driving device for causing inertial force, not only the weight of the lens driving device is increased, but also the diameter of the cylinder is increased.
- piezoelectric-driving optical lens which is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- the primary object of the present invention is to provide a piezoelectric-driving optical lens, which is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- the present invention provides a piezoelectric-driving optical lens, comprising:
- the lens further comprises:
- the lens can have two or more than two frames while each frame can receive and hold one optical lens set.
- the guide base is mounted on a back cover while the back cover is connected to the seat.
- the guide base has three guide rods mounted thereon.
- each piezoelectric stator is configured of a metal tube and at least a piezoelectric ceramic piece, each being arranged to adhere to a side of the metal tube, wherein, the metal tube is arranged to abut against the friction ring.
- the piezoelectric stator has two piezoelectric ceramic pieces and the two piezoelectric ceramic pieces are adhered respectively on the metal tube while being arranged adjacent to each other for forming a near-90 degree included angle therebetween.
- electrodes are coated on each piezoelectric ceramic piece according to a predetermined pattern.
- each piezoelectric ceramic piece is polarized in segments.
- each piezoelectric ceramic piece is divided in to sections and polarized respectively while each section is adhered upon its corresponding side of the metal tube in respective.
- the piezoelectric-driving optical lens has three piezoelectric stators while the three piezoelectric stators can be driven independently or simultaneously.
- the piezoelectric-driving optical lens has two piezoelectric stator while the two piezoelectric stators can be driven independently or simultaneously with respect to an idler wheel.
- the piezoelectric-driving optical lens has one piezoelectric stator while the piezoelectric stator is driven with respect to two idler wheels.
- the plural piezoelectric stators are equiangularly spaced and surrounding the periphery of the lens.
- the driving mode of each piezoelectric stator is a mode selected from the group consisting of a single-frequency single-phase driving mode, a single-frequency dual-phase driving mode, a dual-frequency single-phase driving mode and a dual-frequency dual-phase driving mode.
- the seat further comprises:
- the adjusting part further comprises:
- the resilience element is a substance selected from the group consisting of a spring, a reed, an elastic foam rubber, a sponge and the combinations thereof.
- the seat has two holding parts, being disposed respectively at positions corresponding to the front and back of the hole of the packing part.
- the seat can be formed as a shape selected from the group consisting of a triangle, a square, a circle and other geometrical shape and the combinations thereof.
- FIG. 1 is an exploded perspective view of an piezoelectric lens assembly, disclosed in U.S. Pat. No. 6,710,950.
- FIG. 2 is a perspective view of a lens driving device, disclosed in U.S. Pat. No. 6,853,507.
- FIG. 3 shows a lens driving apparatus, disclosed in Korea Pat. Appl. No. 1020040078265.
- FIG. 4 shows a piezoelectric-driving optical lens according to a preferred embodiment of the invention
- FIG. 5 is an exploded view of FIG. 4 .
- FIG. 6 is a front view of FIG. 4 .
- FIG. 7 is a left side view of FIG. 4 .
- FIG. 8 is a bottom view of FIG. 4 .
- FIG. 9A ?? FIGG . 9 D shows a variety of piezoelectric stators of the invention.
- the piezoelectric-driving optical lens 10 is comprised of a lens 20 , a plurality of piezoelectric stators 30 and a seat 30 , in which the seat 30 is used for receiving the lens 20 and the plural piezoelectric stators 40 .
- the lens 20 is further composed of a cylindrical barrel 21 having an inner screw thread 212 formed on the inner wall thereof, a frame 22 , a lid 23 and a guide base 24 , in which the cylindrical barrel with a friction ring 211 is annularly mounted on the outer wall of the barrel as the outer diameter of the friction ring 211 .
- the function of the friction ring 211 is to provide additional friction to assist the plural piezoelectric stators 30 for rotating the cylindrical barrel 21 .
- the frame 22 being formed as a ring with outer screw thread 222 , is used for holding a set of optical lenses 221 while screwing the frame 22 upon the inner screw thread 21 of the cylindrical barrel 21 by the outer screw thread 222 thereof so as to fix the frame 22 inside the cylindrical barrel 21 .
- the frame 22 is enabled to perform a focusing or zooming operation.
- the lid 23 can be shaped like a disc and disposed at one axial end of the cylindrical barrel 21 for preventing the frames 22 inside the cylindrical barrel 21 from moving out of the same.
- the guide base 24 is disposed at another axial end of the cylindrical barrel 21 opposite to that of the lid 23 , which have a plurality of guide rods 241 connected thereto while enabling each to be arranged on a barrel-facing surface of the guide base 24 and extending inside the cylindrical barrel 21 .
- each guide rod 241 is parallel to those of the cylindrical barrel 21 , each frame 22 , the lid 23 while enabling each guide rod 241 to drill through and connect to each frame 22 and the lid 23 .
- the guide base 24 is mounted on a back cover 33 while the back cover 33 is connected to the seat 30 .
- FIG. 5 to FIG. 7 show an exploded view, a front view and a left side view of FIG. 4 .
- the seat 30 is primarily composed of two holding parts 31 a , 31 b , a packing part 32 , a back cover 33 and an adjusting part 34 .
- the holding part 31 a is selected and used as illustration.
- the holding part 31 a is comprised of: a first hole 311 a , boring through the holding part 31 a for enabling the lens 20 to pass therethrough; a gap 313 a , being substantially a cut from a side of the first hole 311 a to the periphery of the holding part 31 a ; and a plurality of second holes 312 a , disposed surrounding the first hole 311 a for enabling the plural piezoelectric stators 40 to pass therethrough in respective.
- the packing part 32 being sandwiched between the two holding parts 31 a , 31 b , is comprised of: a hole 321 , boring through the packing part 32 for enabling the lens 20 and the plural piezoelectric stators 40 to pass therethrough; and a gap 323 , formed on the packing part 32 at a position corresponding to the gaps 313 a , 313 b of the two holding parts 31 a , 31 b ; wherein, two via holes 322 are bored respectively from the two cutting surfaces of the gap 323 to the periphery of the packing part 32 while keeping the two via holes 322 on a same axle and maintaining the axle shared by the two via holes to be perpendicular to the axle of the lens 20 .
- the adjusting part 34 being inserted and passing through the two via holes 322 for adjusting the clearance of the gap 323 , is comprised of a resilience element 341 , a bolt 342 and a nut 343 .
- the resilience element 341 being disposed inside the gap 323 of the packing part 32 , can be a substance selected from the group consisting of a spring, a reed, an elastic foam rubber, a sponge and the combinations thereof;
- the bolt 342 is capable of being inserted into the two via holes 322 of the packing part 32 from one of the two openings of the two holes 32 located at the periphery of the packing part 32 while penetrating the resilience element 341 ;
- the nut 343 is positioned at another opening of the two via holes 322 located at the periphery of the packing part 32 for the bolt 342 to screw fixedly thereupon.
- the clearance of the gap 323 of the packing part 32 can be adjusted by relatively rotating the bolt 342 and the nut 343 .
- the holding part 31 a , the packing part 32 , the holding part 31 b , and the back cover 33 can be sequentially assembled by means of gluing, clipping or screwing, and so on, and the resulting assembly is shaped as that shown in FIG. 4 which is a triangle. However, it can be a square, a circle and other geometrical shape and the combinations thereof, that are dependent on actual needs.
- the lens 20 is arranged passing the first hole 311 a , the hole 321 and the first hole 311 b and as the guide base 24 of the lens 20 is mounted and fixed upon the back cover 33 while the plural piezoelectric stators 40 are arranged passing the second hole 312 a , the hole 321 and the second hole 312 b , the gaps 313 , 323 of the holding part 31 and the packing part 32 can be adjusted by screwing the bolt 342 since the holding part 31 and the packing part 32 are fixedly interconnected, thereby, the friction ring 211 of the lens 20 can be maintained to keep in contact with the three piezoelectric stators 40 at a preferred state.
- each of the three piezoelectric stators 40 is configured of a metal tube 41 and two piezoelectric ceramic pieces 42 , in which the metal tube 41 is arranged to abut against the friction ring 211 , and the two piezoelectric ceramic pieces 42 are arranged to adhere to a side of the metal tube 41 in a manner that the two piezoelectric ceramic pieces 42 are adhered respectively on the metal tube 41 while being arranged adjacent to each other for forming a near-90 degree included angle therebetween.
- each piezoelectric stator 40 there can be only one piezoelectric ceramic piece 42 configured in each piezoelectric stator 40 whereas the only piezoelectric ceramic piece 42 is attached to a side of the metal tube 41 .
- the three piezoelectric stators 40 are equiangularly spaced and surrounding the periphery of the lens 20 while being disposed in the seat 30 , in which the metal tube 41 of each piezoelectric stator 40 is abutted against the friction ring 211 of the lens 20 for exerting rotation force upon the cylindrical barrel 21 of the lens 20 .
- the second holes 312 a , 312 b are shaped as a triangle in corresponding to the triangle shapes of the piezoelectric stators 40 while enabling the points of the triangle-shaped hole 321 to be placed corresponding to the piezoelectric stators 40 . It is noted that the shapes of the second holes 312 a , 312 b and the hole 321 are varied with respect to that of the piezoelectric stators 40 .
- each piezoelectric stator 40 is a mode selected from the group consisting of a single-frequency single-phase driving mode (i.e. V sin ⁇ t or V cos ⁇ t), a single-frequency dual-phase driving mode (i.e. V sin ⁇ t and v cos ⁇ t), a dual-frequency single-phase driving mode (i.e. V sin ⁇ 1 t & V sin ⁇ 2 t or V cos ⁇ 1 t & V cos ⁇ 2 t, wherein ⁇ 1 ⁇ 2 ) and a dual-frequency dual-phase driving mode (i.e.
- the piezoelectric stators 40 , 140 , 240 are substantially composed of a metal tube, i.e. the tubes 41 , 141 , 241 in respective, with two piezoelectric ceramic pieces attached thereon, which are the two piezoelectric ceramic pieces 42 , 142 , 242 in respective.
- the differences between the embodiment shown in FIG. 9A to FIG. 9C are that: in FIG. 9A , the two piezoelectric ceramic pieces 42 are polarized in respective and independently; in FIG.
- each piezoelectric ceramic piece 142 is coated on each piezoelectric ceramic piece 142 according to a predetermined pattern; and in FIG. 9C , each piezoelectric ceramic piece 242 is polarized in segments As for that shown in FIG. 9D , each piezoelectric ceramic piece 342 is divided in to sections and polarized respectively while each section is adhered upon its corresponding side of the metal tube 341 in respective.
- V sin, V cos, etc. are known to those skilled in the art and used only as illustration, that the driving modes are not limited thereby and thus can be a square wave, a triangle wave, and so on.
- a driving voltage and frequency of one of the aforesaid driving mode is provided to the plural piezoelectric stators 40 for driving the same simultaneously to provide a maximum output force upon the friction ring 211 , and thus, the friction caused by the maximum output force upon the friction ring 211 will bring the cylindrical barrel 21 of the lens 20 to rotate.
- the frames 22 inside the cylindrical barrel 21 is enabled to zoon in or out by the guide base 24 while the lid 23 prevents the frames 22 from moving out of the cylindrical barrel 21 .
- the optimal boundary conditions and the assembling of the lens 20 and the piezoelectric stators 40 are all being defined by the seat 30 as the lens 20 and the piezoelectric stators 40 are all fixedly secured in the seat 30 , such that enables the piezoelectric stators 40 to provide the maximum output force for zooming the lens 20 .
- the piezoelectric-driving optical lens 20 can have two piezoelectric stators 40 while the two piezoelectric stators 40 can be driven independently or simultaneously with respect to an idler wheel, or the piezoelectric-driving optical lens 20 can have one piezoelectric stator 40 while the piezoelectric stator 40 is driven with respect to two idler wheels.
- an piezoelectric-driving optical lens 10 can be established and adapted for various lens-related applications, such as video conference systems, monitor systems, conventional cameras, digital cameras and camera phones, as it is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- the piezoelectric optical lens 10 is able to drive three piezoelectric stators 40 simultaneously for outputting maximum torque while maintaining the diameter as well as the thickness to be within 10 mm, that it is advantageous in small size.
- the structures of the primary components of the invention such as the piezoelectric stators 40 , lens 20 and seat 30 , are all very simple that can be integrally formed or can be assembled using common parts, it is ease-to-manufacture and ease-to-assemble.
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Abstract
A piezoelectric-driving optical lens is disclosed, which comprises: a lens, having a barrel with a friction ring annularly mounted on the outer wall of the barrel as the outer diameter of the friction ring is larger than that of the barrel; a plurality of piezoelectric stators, arranged surrounding the lens and abutted against the friction ring, for providing a rotation driving force to the lens for focusing or zooming function; and a seat, for receiving the lens and the plural piezoelectric stators; wherein, the plural piezoelectric stators can actuate simultaneously to output a maximum driving torque.
Description
- This patent application is based on an U.S. patent application Ser. No. 11/556,330 filed on Nov. 3, 2006.
- The present invention relates to piezoelectric-driving optical lens, and more particularly, to an optical lens capable of being driven to rotate by piezoelectric stators for focusing or zooming. It is suitable for various lens-related applications, such as video conference systems, monitor systems, conventional cameras, digital cameras and camera phones, as it is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- Nowadays, ultrasonic motors, also known as piezoelectric motors, and other piezoelectric actuators are commonly used in conventional cameras, digital cameras and camera phones, that are functioned as the drives of optical lenses for focusing the same and are becoming one of the most important elements for optical products. One such example is the Helimorph® piezoelectric actuator of 1 Ltd., England. It is a coil-like bimorph piezoelectric ceramic actuator. The actuators have some properties of compact, low power consumption, silent operation and high displacement to act as the mechanism for focussing. However, while manufacturing the coil-like Helimorph® piezoelectric actuator from a raw bimorph piezoelectric ceramic, a great amount of procedures are required to be accomplished manually, that are not preferred to be done by automatic machinery since the referring manufacturing procedures are difficult and highly delicate that manual operation can reduce the risk of low yield and instable quality. As the manufacturing of the coil-like bimorph piezoelectric ceramic actuator requires many man powers, it is difficult to apply the aforesaid coil-like piezoelectric actuator massively in industries relating to conventional cameras, digital cameras and camera phones.
- Moreover, it is highly common and had already a prior art for a conventional camera to adopt piezoelectric motors or other piezoelectric actuators in its configuration. Such applications can be seen in U.S. Pat. No. 4,755,705, U.S. Pat. No. 4,786,836, U.S. Pat. No. 4,829,209, U.S. Pat. No. 4,935,659, U.S. Pat. No. 4,952,834, U.S. Pat. No. 4,959,580, U.S. Pat. No. 5,013,982, and so on. As the sizes of those conventional film-using cameras are usually large enough, they will have no problem accommodating the prior-art piezoelectric motors within their configurations. Nevertheless, as digital cameras are gradually replacing the conventional film-using cameras and cellular phones with auto-focus camera are becoming more and more popular, the aforesaid prior-art piezoelectric motors are becoming too bulky and no longer suitable to fit in those two products since the sizes of the two are usually smaller that that of a conventional camera. Hence, it is noted that the size of the prior-art optical lens module is the major restriction preventing the miniaturization of digital camera and camera phone.
- There are already a few patents, dissertations and researches relating to the development of compact piezoelectric-driving optical lens for digital cameras and camera phones. However, the structures of all those compact piezoelectric-driving optical lens are too complicated to be manufactured in batch processes.
- Please refer to
FIG. 1 , which is an exploded perspective view of an piezoelectric lens assembly, disclosed in U.S. Pat. No. 6,710,950, entitled “Piezoelectric actuator for digital camera optical system”. The lens assembly, as shown inFIG. 1 , consists of asupport tube 9 and alens tube 10.Lens tube 10 holds the lens and is mounted coaxially withinsupport tube 9 while being supported within thesupport tube 9 for movement in an axial direction. The circuit board for the piezoelectric drive is a flexible printedcircuit board 14 arranged about the outercylindrical surface 15 of thesupport tube 9. A plurality of piezoelectric elements, as thepiezoelectric element 11 illustrated inFIG. 1 , and their associated components are connected and supported directly by theflexible circuit board 14. The assembly of flexible circuit board and aresilient insulating sheet 15 is held in place onsupport tube 9 by a split ring shapedspring 16. Support and motion for thelens tube 10 is provided by the plural piezoelectric elements. However, the autofocus capability of the lens assembly is entirely dependent on the displacement of thelens tube 10, and consequently, it is bulky and difficult to provide an accurate circuit control. - Please refer to
FIG. 2 , which is a perspective view of a lens driving device, disclosed in U.S. Pat. No. 6,853,507, entitled “Lens driving device”. The cylindrical stationary barrel 7 is mounted on thebase 35 while the cylindrical rotary barrel 6, also mounted on thebase 35, is disposed surrounding the stationary barrel 7. Thefocus lens 1, fitted in a lens frame3, is movably mounted within the stationary barrel 7 in a manner that thebosses 11 thereof are projected outward. The barrels 6 and 7 are provided with thelinear guide slots bosses 11 so that thelens 1 may be shift forward and backward along theguide slots driving member 30, also mounted on thebase 35 while enabling its teeth-like segments 31 to be arranged substantially adjoining the barrel 6 so that the segments are in contact with the barrel 6. Thepiezoelectric actuator 10, being arranged in the form of a ring around the rotary barrel 6, is contracted or expanded radially in response to an input signal from the outside. As thepiezoelectric actuator 10 repeats radial contraction toward the barrel and radial restoration from the same, thedrive member 30 is driven to repeat contraction and restoration in response to radial contraction of thepiezoelectric actuator 10, pushing theinclined segments 31 outward, so that thesegments 31 rotate the rotary barrel 6 along the inclination of thesegments 31 and thus drive thelens 1 to move axially inside the stationary barrel 7. However, the cost of the lens driving device is expensive since the structure of aforesaid lens driving device is still very complicated, not to mention the difficulty of manufacturing thedriving member 30, and thepiezoelectric actuator 10 must be polarized in segment. - Please refer to
FIG. 3 , which shows a lens driving apparatus, disclosed in Korea Pat. Appl. No. 1020040078265, entitled “Transfer unit, in which a lens and an actuator are formed in one body”. The lens driving device is substantially a cylinder 19 having aguide rod 12, apiezoelectric member 13 and a supportingblock 14 arranged therein. However, as certain mass is required in the aforesaid lens driving device for causing inertial force, not only the weight of the lens driving device is increased, but also the diameter of the cylinder is increased. - As the structures of all those aforesaid prior-art piezoelectric optical lenses are very complicate, not only they are difficult to manufacture, but also they are not easy to be assembled that is especially true for the assembling of the piezoelectric stators. Hence, the driving force provided thereby is diminished. Moreover, as some minute parts thereof can not be fabricated by machine, the consumption of man-power and cost are increased. Thus, although the sizes of aforesaid prior-art piezoelectric-driving optical lenses are reduced, they have no competitive advantage over cost reduction and thus are not feasible for commercial marketing.
- Therefore, it is in need of a piezoelectric-driving optical lens, which is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- In view of the disadvantages of prior art, the primary object of the present invention is to provide a piezoelectric-driving optical lens, which is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque.
- To achieve the above object, the present invention provides a piezoelectric-driving optical lens, comprising:
-
- a lens, having a cylindrical barrel with a friction ring annularly mounted on the outer wall of the barrel as the outer diameter of the friction ring is larger than that of the barrel;
- a plurality of piezoelectric stators, arranged surrounding the lens and abutted against the friction ring, for providing a rotation driving force to the lens; and
- a seat, for receiving the lens and the plural piezoelectric stators;
- wherein, the plural piezoelectric stators can be driven simultaneously to output a maximum driving torque for focusing the lens.
- In a preferred aspect, the lens further comprises:
-
- an inner screw thread, formed on the inner wall of the cylindrical barrel;
- at least a frame, each for holding a set of optical lenses while each being screwed into the barrel;
- a lid, disposed at an axial end of the barrel for preventing the frame from moving out of the barrel; and
- a guide base, disposed at another axial end of the cylindrical barrel opposite to that of the lid, having a plurality of guide rods, each being arranged on a barrel-facing surface of the base while extending inside the barrel;
- wherein, the axial direction of each guide rod is parallel to those of the cylindrical barrel, each frame, the lid while enabling each guide rod to drill through and connect to each frame and the lid.
- Preferably, the lens can have two or more than two frames while each frame can receive and hold one optical lens set.
- Preferably, the guide base is mounted on a back cover while the back cover is connected to the seat.
- Preferably, the guide base has three guide rods mounted thereon.
- Preferably, each piezoelectric stator is configured of a metal tube and at least a piezoelectric ceramic piece, each being arranged to adhere to a side of the metal tube, wherein, the metal tube is arranged to abut against the friction ring.
- In a preferred embodiment, the piezoelectric stator has two piezoelectric ceramic pieces and the two piezoelectric ceramic pieces are adhered respectively on the metal tube while being arranged adjacent to each other for forming a near-90 degree included angle therebetween.
- Preferably, electrodes are coated on each piezoelectric ceramic piece according to a predetermined pattern.
- Preferably, each piezoelectric ceramic piece is polarized in segments.
- Preferably, each piezoelectric ceramic piece is divided in to sections and polarized respectively while each section is adhered upon its corresponding side of the metal tube in respective.
- In a preferred embodiment, the piezoelectric-driving optical lens has three piezoelectric stators while the three piezoelectric stators can be driven independently or simultaneously.
- Preferably, the piezoelectric-driving optical lens has two piezoelectric stator while the two piezoelectric stators can be driven independently or simultaneously with respect to an idler wheel.
- Preferably, the piezoelectric-driving optical lens has one piezoelectric stator while the piezoelectric stator is driven with respect to two idler wheels.
- Preferably, the plural piezoelectric stators are equiangularly spaced and surrounding the periphery of the lens.
- Preferably, the driving mode of each piezoelectric stator is a mode selected from the group consisting of a single-frequency single-phase driving mode, a single-frequency dual-phase driving mode, a dual-frequency single-phase driving mode and a dual-frequency dual-phase driving mode.
- In a preferred embodiment, the seat further comprises:
-
- at least a holding part, further comprising:
- a first hole, boring through the holding part for enabling the lens to pass therethrough;
- a gap, being substantially a cut from a side of the first hole to the periphery of the holding part; and
- a plurality of second holes, disposed surrounding the first hole for enabling the plural piezoelectric stators to pass therethrough in respective;
- a packing part, further comprising:
- a hole, boring through the packing part for enabling the lens and the plural piezoelectric stators to pass therethrough; and
- a gap, formed on the packing part at a position corresponding to the gap of the holding part;
- an adjusting part, for adjusting the clearance of the gap;
- wherein, two via holes are bored respectively from the two cutting surfaces of the gap to the periphery of the packing part while keeping the two holes on a same axle and maintaining the axle shared by the two hole to be perpendicular to the axle of the lens.
- at least a holding part, further comprising:
- Preferably, the adjusting part further comprises:
-
- a resilience element, being disposed inside the gap of the packing part;
- a bolt, capable of being inserted into the two via holes of the packing part from one of the two openings of the two holes located at the periphery of the packing part while penetrating the resilience element; and
- a nut, being positioned at another opening of the two holes located at the periphery of the packing part for the bolt to screw fixedly thereupon;
- wherein, the clearance of the gap of the packing part can be adjusted by relative rotating the bolt and the nut relatively.
- Preferably, the resilience element is a substance selected from the group consisting of a spring, a reed, an elastic foam rubber, a sponge and the combinations thereof.
- Preferably, the seat has two holding parts, being disposed respectively at positions corresponding to the front and back of the hole of the packing part.
- Preferably, the seat can be formed as a shape selected from the group consisting of a triangle, a square, a circle and other geometrical shape and the combinations thereof.
- Other aspects and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings, illustrating by way of example the principles of the present invention.
-
FIG. 1 is an exploded perspective view of an piezoelectric lens assembly, disclosed in U.S. Pat. No. 6,710,950. -
FIG. 2 is a perspective view of a lens driving device, disclosed in U.S. Pat. No. 6,853,507. -
FIG. 3 shows a lens driving apparatus, disclosed in Korea Pat. Appl. No. 1020040078265. -
FIG. 4 shows a piezoelectric-driving optical lens according to a preferred embodiment of the invention -
FIG. 5 is an exploded view ofFIG. 4 . -
FIG. 6 is a front view ofFIG. 4 . -
FIG. 7 is a left side view ofFIG. 4 . -
FIG. 8 is a bottom view ofFIG. 4 . -
FIG. 9A˜FIG . 9D shows a variety of piezoelectric stators of the invention. - For your esteemed members of reviewing committee to further understand and recognize the fulfilled functions and structural characteristics of the invention, several preferable embodiments cooperating with detailed description are presented as the follows.
- Please refer to
FIG. 4 andFIG. 5 , which show respectively a piezoelectric-driving optical lens according to a preferred embodiment of the invention and its exploded view. As seen in the figures, the piezoelectric-drivingoptical lens 10 is comprised of alens 20, a plurality ofpiezoelectric stators 30 and aseat 30, in which theseat 30 is used for receiving thelens 20 and the pluralpiezoelectric stators 40. - The
lens 20 is further composed of acylindrical barrel 21 having aninner screw thread 212 formed on the inner wall thereof, aframe 22, alid 23 and aguide base 24, in which the cylindrical barrel with afriction ring 211 is annularly mounted on the outer wall of the barrel as the outer diameter of thefriction ring 211. It is noted that the function of thefriction ring 211 is to provide additional friction to assist the pluralpiezoelectric stators 30 for rotating thecylindrical barrel 21. Theframe 22, being formed as a ring withouter screw thread 222, is used for holding a set ofoptical lenses 221 while screwing theframe 22 upon theinner screw thread 21 of thecylindrical barrel 21 by theouter screw thread 222 thereof so as to fix theframe 22 inside thecylindrical barrel 21. By the relative rotations of thecylindrical barrel 21 and theframe 22, theframe 22 is enabled to perform a focusing or zooming operation. In a preferred aspect, there can be two or more than twoframes 22 in alens 20 while eachframe 22 can receive and hold oneoptical lens set 221. Moreover, thelid 23 can be shaped like a disc and disposed at one axial end of thecylindrical barrel 21 for preventing theframes 22 inside thecylindrical barrel 21 from moving out of the same. Theguide base 24 is disposed at another axial end of thecylindrical barrel 21 opposite to that of thelid 23, which have a plurality ofguide rods 241 connected thereto while enabling each to be arranged on a barrel-facing surface of theguide base 24 and extending inside thecylindrical barrel 21. Preferably, the axial direction of eachguide rod 241 is parallel to those of thecylindrical barrel 21, eachframe 22, thelid 23 while enabling eachguide rod 241 to drill through and connect to eachframe 22 and thelid 23. As seen inFIG. 4 andFIG. 5 , there areholes frame 22 and thelid 23 at positions corresponding to theguide rods 241 in respective, that can be passed through by theguide rods 241 and thus hold and secure theguide rods 241. Moreover, theguide base 24 is mounted on aback cover 33 while theback cover 33 is connected to theseat 30. - Please refer to
FIG. 5 toFIG. 7 , which show an exploded view, a front view and a left side view ofFIG. 4 . Theseat 30 is primarily composed of two holdingparts part 32, aback cover 33 and an adjustingpart 34. As the structures of the two holdingparts part 31 a is selected and used as illustration. As seen in the figures, the holdingpart 31 a is comprised of: afirst hole 311 a, boring through the holdingpart 31 a for enabling thelens 20 to pass therethrough; agap 313 a, being substantially a cut from a side of thefirst hole 311 a to the periphery of the holdingpart 31 a; and a plurality ofsecond holes 312 a, disposed surrounding thefirst hole 311 a for enabling the pluralpiezoelectric stators 40 to pass therethrough in respective. The packingpart 32, being sandwiched between the two holdingparts hole 321, boring through the packingpart 32 for enabling thelens 20 and the pluralpiezoelectric stators 40 to pass therethrough; and agap 323, formed on the packingpart 32 at a position corresponding to thegaps parts holes 322 are bored respectively from the two cutting surfaces of thegap 323 to the periphery of the packingpart 32 while keeping the two viaholes 322 on a same axle and maintaining the axle shared by the two via holes to be perpendicular to the axle of thelens 20. In addition, the adjustingpart 34, being inserted and passing through the two viaholes 322 for adjusting the clearance of thegap 323, is comprised of aresilience element 341, abolt 342 and anut 343. Theresilience element 341, being disposed inside thegap 323 of the packingpart 32, can be a substance selected from the group consisting of a spring, a reed, an elastic foam rubber, a sponge and the combinations thereof; thebolt 342 is capable of being inserted into the two viaholes 322 of the packingpart 32 from one of the two openings of the twoholes 32 located at the periphery of the packingpart 32 while penetrating theresilience element 341; and thenut 343 is positioned at another opening of the two viaholes 322 located at the periphery of the packingpart 32 for thebolt 342 to screw fixedly thereupon. Thereby, the clearance of thegap 323 of the packingpart 32 can be adjusted by relatively rotating thebolt 342 and thenut 343. - It is noted that the holding
part 31 a, the packingpart 32, the holdingpart 31 b, and theback cover 33 can be sequentially assembled by means of gluing, clipping or screwing, and so on, and the resulting assembly is shaped as that shown inFIG. 4 which is a triangle. However, it can be a square, a circle and other geometrical shape and the combinations thereof, that are dependent on actual needs. As thelens 20 is arranged passing thefirst hole 311 a, thehole 321 and thefirst hole 311 b and as theguide base 24 of thelens 20 is mounted and fixed upon theback cover 33 while the pluralpiezoelectric stators 40 are arranged passing thesecond hole 312 a, thehole 321 and thesecond hole 312 b, thegaps 313, 323 of the holdingpart 31 and the packingpart 32 can be adjusted by screwing thebolt 342 since the holdingpart 31 and the packingpart 32 are fixedly interconnected, thereby, thefriction ring 211 of thelens 20 can be maintained to keep in contact with the threepiezoelectric stators 40 at a preferred state. - As seen in
FIG. 5 andFIG. 9A , there are threepiezoelectric stators 40 that can be driven independently or simultaneously. Each of the threepiezoelectric stators 40 is configured of ametal tube 41 and two piezoelectricceramic pieces 42, in which themetal tube 41 is arranged to abut against thefriction ring 211, and the two piezoelectricceramic pieces 42 are arranged to adhere to a side of themetal tube 41 in a manner that the two piezoelectricceramic pieces 42 are adhered respectively on themetal tube 41 while being arranged adjacent to each other for forming a near-90 degree included angle therebetween. It is noted that there can be only one piezoelectricceramic piece 42 configured in eachpiezoelectric stator 40 whereas the only piezoelectricceramic piece 42 is attached to a side of themetal tube 41. In this preferred embodiment, the threepiezoelectric stators 40 are equiangularly spaced and surrounding the periphery of thelens 20 while being disposed in theseat 30, in which themetal tube 41 of eachpiezoelectric stator 40 is abutted against thefriction ring 211 of thelens 20 for exerting rotation force upon thecylindrical barrel 21 of thelens 20. For enabling each metal tube to abut against thelens 20 exactly while preventing the pluralpiezoelectric stators 40 to rotate, thesecond holes piezoelectric stators 40 while enabling the points of the triangle-shapedhole 321 to be placed corresponding to thepiezoelectric stators 40. It is noted that the shapes of thesecond holes hole 321 are varied with respect to that of thepiezoelectric stators 40. - Please refer to
FIG. 9A toFIG. 9D , which shows a variety of piezoelectric stators of the invention. The driving mode of eachpiezoelectric stator 40 is a mode selected from the group consisting of a single-frequency single-phase driving mode (i.e. V sin ωt or V cos ωt), a single-frequency dual-phase driving mode (i.e. V sin ωt and v cos ωt), a dual-frequency single-phase driving mode (i.e. V sin ω1t & V sin ω2t or V cos ω1t & V cos ω2t, wherein ω1≠ω2) and a dual-frequency dual-phase driving mode (i.e. V sin ω1t and V cos ω2t, wherein ω1≠ω2). InFIG. 9A toFIG. 9C , thepiezoelectric stators tubes ceramic pieces FIG. 9A toFIG. 9C are that: inFIG. 9A , the two piezoelectricceramic pieces 42 are polarized in respective and independently; inFIG. 9B , electrodes are coated on each piezoelectricceramic piece 142 according to a predetermined pattern; and inFIG. 9C , each piezoelectricceramic piece 242 is polarized in segments As for that shown inFIG. 9D , each piezoelectricceramic piece 342 is divided in to sections and polarized respectively while each section is adhered upon its corresponding side of themetal tube 341 in respective. It is noted that the aforesaid V sin, V cos, etc., are known to those skilled in the art and used only as illustration, that the driving modes are not limited thereby and thus can be a square wave, a triangle wave, and so on. - Operationally, as referring to
FIG. 4 andFIG. 5 , a driving voltage and frequency of one of the aforesaid driving mode is provided to the pluralpiezoelectric stators 40 for driving the same simultaneously to provide a maximum output force upon thefriction ring 211, and thus, the friction caused by the maximum output force upon thefriction ring 211 will bring thecylindrical barrel 21 of thelens 20 to rotate. As thelens 20 is rotating, theframes 22 inside thecylindrical barrel 21 is enabled to zoon in or out by theguide base 24 while thelid 23 prevents theframes 22 from moving out of thecylindrical barrel 21. At the same time that, the optimal boundary conditions and the assembling of thelens 20 and thepiezoelectric stators 40 are all being defined by theseat 30 as thelens 20 and thepiezoelectric stators 40 are all fixedly secured in theseat 30, such that enables thepiezoelectric stators 40 to provide the maximum output force for zooming thelens 20. Instead of the threepiezoelectric stators 40 used in the embodiment shown inFIG. 4 andFIG. 5 , the piezoelectric-drivingoptical lens 20 can have twopiezoelectric stators 40 while the twopiezoelectric stators 40 can be driven independently or simultaneously with respect to an idler wheel, or the piezoelectric-drivingoptical lens 20 can have onepiezoelectric stator 40 while thepiezoelectric stator 40 is driven with respect to two idler wheels. - To sum up, by the aforesaid
piezoelectric stators 40,lens 20 andseat 30, an piezoelectric-drivingoptical lens 10 can be established and adapted for various lens-related applications, such as video conference systems, monitor systems, conventional cameras, digital cameras and camera phones, as it is compact, solid, simple-in-structure, ease-to-manufacture, ease-to-assemble, and capable of exerting a comparatively larger torque. Comparing to prior art, the piezoelectricoptical lens 10 is able to drive threepiezoelectric stators 40 simultaneously for outputting maximum torque while maintaining the diameter as well as the thickness to be within 10 mm, that it is advantageous in small size. In addition, as the structures of the primary components of the invention, such as thepiezoelectric stators 40,lens 20 andseat 30, are all very simple that can be integrally formed or can be assembled using common parts, it is ease-to-manufacture and ease-to-assemble. - While the preferred embodiment of the invention has been set forth for the purpose of disclosure, modifications of the disclosed embodiment of the invention as well as other embodiments thereof may occur to those skilled in the art. Accordingly, the appended claims are intended to cover all embodiments which do not depart from the spirit and scope of the invention.
Claims (6)
1. A piezoelectric-driving optical lens, comprising:
a lens, having a cylindrical barrel with a friction ring annularly mounted on the outer wall of the barrel as the outer diameter of the friction ring is larger than that of the cylinder;
a plurality of piezoelectric stators, arranged surrounding the lens and abutted against the friction ring, for providing a rotation driving force to the lens, wherein each piezoelectric stator is configured of a metal tube and a piezoelectric ceramic piece, each being arranged to adhere to a side of the metal tube, while the metal tube is arranged to abut against the friction ring, and each piezoelectric ceramic piece is polarized in segments; and
a seat, for receiving the lens and the plural piezoelectric stators.
2. The piezoelectric-driving optical lens of claim 1 , wherein electrodes are coated on each piezoelectric ceramic piece according to a predetermined pattern.
3. The piezoelectric-driving optical lens of claim 1 , wherein each piezoelectric ceramic piece is divided into sections and polarized respectively while each section is adhered upon its corresponding side of the metal tube in respective.
4. A piezoelectric-driving optical lens, comprising:
a lens, having a cylindrical barrel with a friction ring annularly mounted on the outer wall of the barrel as the outer diameter of the friction ring is larger than that of the cylinder;
a first piezoelectric stator, arranged surrounding the lens and abutted against the friction ring, for providing a rotation driving force to the lens, wherein the first piezoelectric stator is driven with respect to two idler wheels; and
a seat, for receiving the lens and the plural piezoelectric stators.
5. The piezoelectric-driving optical lens of claim 4 , wherein the piezoelectric-driving optical lens further comprises a second piezoelectric stator and a third piezoelectric stator wherein the first piezoelectric stator, the second piezoelectric stator, and the third piezoelectric stator can be driven independently or simultaneously.
6. The piezoelectric-driving optical lens of claim 4 , wherein the piezoelectric-driving optical lens further comprises a second piezoelectric stator wherein the first piezoelectric stator and the second piezoelectric stator can be driven independently or simultaneously with respect to an idler wheel.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US12/629,528 US20100073787A1 (en) | 2006-09-26 | 2009-12-02 | Piezoelectric-driving optical lens |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW095135549 | 2006-09-26 | ||
TW095135549A TWI308648B (en) | 2006-09-26 | 2006-09-26 | Piezoelectric optical lens |
US11/556,330 US7643232B2 (en) | 2006-09-26 | 2006-11-03 | Piezoelectric-driving optical lens |
US12/629,528 US20100073787A1 (en) | 2006-09-26 | 2009-12-02 | Piezoelectric-driving optical lens |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/556,330 Division US7643232B2 (en) | 2006-09-26 | 2006-11-03 | Piezoelectric-driving optical lens |
Publications (1)
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US20100073787A1 true US20100073787A1 (en) | 2010-03-25 |
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Family Applications (2)
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US11/556,330 Expired - Fee Related US7643232B2 (en) | 2006-09-26 | 2006-11-03 | Piezoelectric-driving optical lens |
US12/629,528 Abandoned US20100073787A1 (en) | 2006-09-26 | 2009-12-02 | Piezoelectric-driving optical lens |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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US11/556,330 Expired - Fee Related US7643232B2 (en) | 2006-09-26 | 2006-11-03 | Piezoelectric-driving optical lens |
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US (2) | US7643232B2 (en) |
TW (1) | TWI308648B (en) |
Families Citing this family (4)
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CN101557177B (en) * | 2008-04-08 | 2013-07-03 | 鸿富锦精密工业(深圳)有限公司 | Piezoelectric driver and lens module |
DE102013212748A1 (en) * | 2013-06-28 | 2014-12-31 | Robert Bosch Gmbh | Imager module for a camera, camera and method for producing the imager module |
US9531926B2 (en) | 2014-11-24 | 2016-12-27 | Apple Inc. | Piezoelectric actuator for camera module |
CN114886389A (en) * | 2022-07-14 | 2022-08-12 | 之江实验室 | Three-dimensional photoacoustic/ultrasonic dual-mode endoscope and imaging method |
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Also Published As
Publication number | Publication date |
---|---|
TWI308648B (en) | 2009-04-11 |
US7643232B2 (en) | 2010-01-05 |
TW200815814A (en) | 2008-04-01 |
US20080074767A1 (en) | 2008-03-27 |
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