Optical zoom ultrasonic motor

Abstract

The utility model discloses an optical zoom ultrasonic motor, which comprises a lens mounting structure, a moving rod and piezoelectric ceramic, the moving rod is connected with the lens mounting structure, the piezoelectric ceramic is arranged at one end of the moving rod, one surface of the piezoelectric ceramic corresponds to one end of the moving rod, and the other surface of the piezoelectric ceramic corresponds to the other end of the moving rod. The first through hole penetrates through two opposite surfaces of the lens mounting structure, and the lens is arranged on the lens mounting structure; during focusing, one surface of the piezoelectric ceramic deforms, and the force generated by the deformation acts on one end of the moving rod, so that the moving rod vibrates, and the moving rod further drives the lens mounting structure to vibrate. Voltage is applied to the piezoelectric ceramic, so that the piezoelectric ceramic is periodically deformed, the moving rod matched with the piezoelectric ceramic is directly pushed to synchronously vibrate, and after vibration of the moving rod is transmitted to the lens mounting structure, the lens mounted on the lens mounting structure quickly vibrates in a micro-amplitude manner in the optical axis direction to form dynamic focus scanning. Therefore, quick focusing of the lens is realized.

Description

Technical Field

[0001] This utility model relates to the field of ultrasonic technology, specifically to an optical zoom ultrasonic motor. Background Technology

[0002] With technological innovation and the driving force of social media, image capture technologies such as photography and video recording are becoming increasingly widespread among users. Ordinary people can take high-quality photos or videos without professional equipment, and then share them on social media platforms or save them to storage devices to preserve precious memories. However, achieving fast focusing within a short time is a problem that needs to be solved when shooting.

[0003] Patent application publication number CN222618851U discloses a defogging lens structure and an in-vehicle electronic camera. Specifically, it discloses a lens assembly, which includes a first lens mounted on the lens near the object side; it also includes a heating coil for increasing the temperature of the first lens, the heating coil being a ring structure attached to the side of the first lens near the image side; and a power supply assembly for supplying power to the heating coil.

[0004] The aforementioned patent heats the first lens with a heating coil, which can quickly remove water mist adhering to the first lens. However, the focusing effect of this patent is insufficient, so it needs to be improved. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide an optical zoom ultrasonic motor that can achieve a fast and precise focusing effect through the ultrasonic energy of piezoelectric ceramics.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An optical zoom ultrasonic motor includes a lens mounting structure, a moving rod, and a piezoelectric ceramic. The moving rod is connected to the lens mounting structure. The piezoelectric ceramic is disposed at one end of the moving rod, and one surface of the piezoelectric ceramic corresponds to one end of the moving rod. A first through hole penetrates two opposite surfaces of the lens mounting structure. A lens is disposed on the lens mounting structure. During focusing, one surface of the piezoelectric ceramic deforms, and the force generated by the deformation acts on one end of the moving rod, causing the moving rod to move. The moving rod further drives the lens mounting structure to move.

[0008] Furthermore, the movable rod is fixedly connected to the lens mounting structure.

[0009] Furthermore, when not in focus, one surface of the piezoelectric ceramic contacts one end of the moving rod.

[0010] Furthermore, when not in focus, one surface of the piezoelectric ceramic is spaced apart from one end of the moving rod by a first distance, the first distance being less than the deformation distance when one surface of the piezoelectric ceramic undergoes deformation.

[0011] Furthermore, the movable rod is slidably connected to the lens mounting structure.

[0012] Furthermore, one surface of the piezoelectric ceramic is connected to one end of the moving rod.

[0013] Furthermore, it also includes a first elastic element, which is sleeved on the movable rod and located between the piezoelectric ceramic and the lens mounting structure.

[0014] Furthermore, it also includes a stop portion, which is disposed on the movable rod and located below the lens mounting structure.

[0015] Furthermore, it also includes a sliding structure, which is disposed on the lens mounting structure, the movable rod cooperates with the sliding structure, and the sliding structure slides on the movable rod.

[0016] Furthermore, the sliding structure is a slider, the slider is provided with a first sliding through hole, the slider is disposed on the lens mounting structure, and the moving rod passes through the first sliding through hole.

[0017] Furthermore, the sliding structure is a second sliding through hole, which is disposed on the lens mounting structure, and the moving rod passes through the second sliding through hole.

[0018] Furthermore, the sliding structure is a sliding clamping structure, which is disposed on the lens mounting structure. The clamping space of the sliding clamping structure is provided with a sliding groove, and the moving rod is disposed in the sliding groove.

[0019] Furthermore, it also includes a guide rod, and the lens mounting structure is slidably connected to the guide rod.

[0020] Furthermore, the lens is disposed in the first through hole.

[0021] Furthermore, the lens is fixed to the top surface of the lens mounting structure.

[0022] Furthermore, it also includes a housing, with a second through hole penetrating the top and bottom surfaces of the housing, and the lens mounting structure, the moving rod, and the piezoelectric ceramic disposed inside the housing.

[0023] Furthermore, an installation space is provided between the top surface of the housing and the top surface of the lens mounting structure, and the lens is disposed in the installation space.

[0024] Furthermore, a clearance space is provided on the inner wall of the top surface of the housing, and the end of the moving rod away from the piezoelectric ceramic is movably disposed in the clearance space.

[0025] Furthermore, a blind hole is provided on the inner wall of the top surface of the housing, and the inner wall and bottom surface of the blind hole form the clearance space.

[0026] Furthermore, a perforation is provided on the inner wall of the top surface of the housing, and the end of the moving rod away from the piezoelectric ceramic is movably disposed in the perforation.

[0027] The beneficial effects of this utility model are as follows:

[0028] 1. By applying voltage to the piezoelectric ceramic, the piezoelectric ceramic undergoes nanoscale deformation under the voltage. The displacement is amplified and transmitted to the lens mounting structure via a moving rod. Through high-frequency pulse voltage control (e.g., 10 Hz to 200 kHz), the lens vibrates rapidly and slightly along the optical axis, forming a dynamic focus scan, thereby achieving rapid focusing of the lens.

[0029] Second, by applying voltage to the piezoelectric ceramic, the piezoelectric ceramic undergoes periodic deformation, which generates high-frequency vibration. This high-frequency vibration directly drives the moving rod that works with it to vibrate synchronously. After the vibration of the moving rod is transmitted to the lens mounting structure, water droplets or other solid particles on the lens mounted on the lens mounting structure are detached due to inertia or changes in surface tension, thereby achieving a cleaning effect. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present invention;

[0031] Figure 2 yes Figure 1 A schematic diagram of the decomposed structure;

[0032] Figure 3 yes Figure 1 A cross-sectional view;

[0033] Figure 4 yes Figure 3 A magnified structural diagram at point A;

[0034] Figure 5 This is a cross-sectional schematic diagram of the second embodiment of the present invention;

[0035] Figure 6 yes Figure 5Enlarged structural diagram at point B;

[0036] Figure 7 This is an exploded structural diagram of the third embodiment of the present invention;

[0037] Figure 8 yes Figure 7 A three-dimensional structural diagram of the middle lens mounting structure;

[0038] Figure 9 This is a cross-sectional schematic diagram of the third embodiment of the present invention;

[0039] Figure 10 This is an exploded structural diagram of the fourth embodiment of the present invention;

[0040] Figure 11 yes Figure 10 A three-dimensional structural diagram of the middle lens mounting structure;

[0041] Figure 12 This is a cross-sectional schematic diagram of the fourth embodiment of the present invention;

[0042] Figure 13 This is an exploded structural diagram of the fifth embodiment of the present invention;

[0043] Figure 14 yes Figure 13 A three-dimensional structural diagram of the middle lens mounting structure;

[0044] Figure 15 This is a cross-sectional schematic diagram of the fifth embodiment of the present invention;

[0045] Figure 16 This is a cross-sectional schematic diagram of one arrangement of the blocking part in the sixth embodiment of this utility model;

[0046] Figure 17 This is a cross-sectional schematic diagram of another arrangement of the blocking part in the sixth embodiment of this utility model;

[0047] Figure 18 This is a three-dimensional structural diagram of the cover in the seventh embodiment of this utility model.

[0048] Figure Labels

[0049] 100. Optical zoom ultrasonic motor;

[0050] 1. Lens mounting structure; 11. First through hole; 111. Hole-like structure; 12. Mounting part; 121. Clamping space; 13. Guide rod; 14. Sliding structure; 141. Sliding clamping structure; 1411. Clamping space; 14111. Sliding groove; 142. Slider; 1421. First sliding through hole; 143. Second sliding through hole;

[0051] 2. Moving rod;

[0052] 3. Piezoelectric ceramics;

[0053] 4. Housing; 41. Second through hole; 411. First sub-through hole; 412. Second sub-through hole; 42. Installation space; 43. Perforation; 44. Base; 441. Groove structure; 442. Plate structure; 45. Cover; 46. Clearance space; 47. Blind hole;

[0054] 5. First elastic element;

[0055] 6. Resisting part. Detailed Implementation

[0056] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top surface", "bottom surface", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the position or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0057] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In this description of the utility model, "a number" means two or more, unless otherwise explicitly specified.

[0058] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can also refer to a mechanical connection; they can refer to a direct connection or a connection through an intermediate medium; or they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0059] The utility model will be further described below with reference to the accompanying drawings and specific embodiments. The following description is merely exemplary and does not limit the scope of protection of the utility model.

[0060] Please refer to Figures 1-4This utility model discloses an optical zoom ultrasonic motor 100, including a lens mounting structure 1, a moving rod 2, and a piezoelectric ceramic 3. The moving rod 2 is connected to the lens mounting structure 1. The piezoelectric ceramic 3 is disposed at one end of the moving rod 2, and one surface of the piezoelectric ceramic 3 corresponds to one end of the moving rod 2. A first through hole 11 penetrates two opposite surfaces of the lens mounting structure 1. A lens (not shown in the figure) is disposed on the lens mounting structure 1. During focusing, one surface of the piezoelectric ceramic 3 deforms, and the force generated by the deformation acts on one end of the moving rod 2, causing the moving rod 2 to vibrate. The moving rod 2 further drives the lens mounting structure 1 to vibrate.

[0061] Specifically, when a driving voltage is applied to the piezoelectric ceramic 3, the crystal structure of the piezoelectric ceramic 3 undergoes periodic deformation due to the electric field (forward voltage causes the piezoelectric ceramic 3 to expand, and reverse voltage causes the piezoelectric ceramic 3 to contract). This deformation manifests as the stretching or bending of the piezoelectric material in a specific direction, with the deformation amount proportional to the voltage amplitude and the vibration frequency consistent with the driving voltage frequency. Although this deformation is minute (usually on the micrometer scale), the frequency can reach several kilohertz, forming high-frequency vibration. The deformation of the piezoelectric ceramic 3 directly drives the rigidly connected moving rod 2. That is, when the driving voltage is a high-frequency AC signal, the piezoelectric ceramic 3 will vibrate at the same frequency, driving the moving rod 2 to make a high-frequency reciprocating motion. The high-frequency vibration of the moving rod 2 will drive the lens on the lens mounting structure 1 to vibrate at a high frequency along the optical axis. The lens vibration causes a change in the equivalent focal length, and the focal point moves periodically back and forth around the photosensitive element (e.g., CMOS / CCD, not shown in the figure), forming a focal scan covering the entire depth of field. When the focal point coincides with the plane of the photosensitive element (the image is clearest), the contrast reaches its peak. The control circuit (not shown in the figure) stops vibration and fixes the lens position by locking the peak position, thus achieving precise focusing.

[0062] Furthermore, before applying the driving voltage, the mass and stiffness of the moving rod 2 and the lens mounting structure 1 can be determined in advance. Based on these determined parameters, the natural frequencies of the moving rod 2 and the lens mounting structure 1 can be calculated, thereby determining the frequency of the driving voltage. When the driving frequency of the piezoelectric ceramic 3's driving voltage matches the natural frequencies of the moving rod 2 and the lens mounting structure 1, resonance will occur among the piezoelectric ceramic 3, the moving rod 2, and the lens mounting structure 1, significantly amplifying the vibration amplitude. When the vibration of the moving rod 2 is transmitted to the lens mounting structure 1, it is then transmitted to the lens, causing water droplets or other solid particles on the lens to detach due to inertia or changes in surface tension, thus achieving a preliminary cleaning effect.

[0063] Furthermore, multiple piezoelectric ceramics 3 can be stacked, with adjacent piezoelectric ceramics 3 connected by electrodes to ultimately form a piezoelectric stack. Compared to a single piezoelectric ceramic 3, the advantages of a piezoelectric stack are: First, through the longitudinal series connection of multiple layers of piezoelectric ceramic 3 sheets, the total displacement of a piezoelectric stack can be several times that of a single-layer piezoelectric ceramic 3 under the same driving voltage. Second, the mechanical resonant frequency of a piezoelectric stack is usually higher than that of a single-layer piezoelectric ceramic 3, and combined with its low inertial mass, microsecond-level response can be achieved.

[0064] In this embodiment, the movable rod 2 is fixedly connected to the lens mounting structure 1, and when the optical zoom ultrasonic motor 100 is not focused, please refer to... Figures 3-4 One surface of the piezoelectric ceramic 3 contacts one end of the moving rod 2. This contact can be a fixed connection or by using a fixing element to fix the height of the lens mounting structure 1, so that the moving rod 2, which is fixedly connected to the lens mounting structure 1, just contacts the piezoelectric ceramic 3. The fixing element can be a spring (not shown in the figure), which is located below the lens mounting structure 1. The length of the spring is adjusted so that the moving rod 2 just contacts the piezoelectric ceramic 3. Whether the contact between the piezoelectric ceramic 3 and the moving rod 2 is achieved through a fixed connection or a fixing element is not limited here and is determined by the actual working conditions.

[0065] Specifically, in this embodiment, a mounting portion 12 is provided on the side wall of the lens mounting structure 1, and a clamping space 121 is provided in the mounting portion 12. The size of the clamping space 121 is basically the same as the size of the moving rod 2, so the moving rod 2 is clamped in the clamping space 121. The advantages of this modular design are: First, the mounting portion 12 can be made of a more rigid material, so that the high-frequency vibration generated by the piezoelectric ceramic 3 can be transmitted to the lens mounting structure 1 more efficiently. Second, if the moving rod 2 is directly connected to the body of the lens mounting structure 1, the periodic stress generated by the high-frequency vibration is prone to form stress concentration at the connection point, which can lead to fatigue or even cracking at the connection point. Third, the mounting portion 12, as an independent component, is easy to install, disassemble, and replace, and is convenient for daily maintenance. Of course, the clamping space 121 can also be directly set on the surface of the lens mounting structure 1 (as shown in the figure). This is not limited here; the moving rod 2 can be fixedly connected to the lens mounting structure 1 according to the actual working conditions.

[0066] More specifically, the mounting part 12 is U-shaped overall. The advantages of this structure are: First, the U-shaped mounting part 12 clamps the upper and lower surfaces of the moving rod 2, thereby limiting the vertical displacement of the moving rod 2 and preventing it from jumping up and down, ensuring that the entire lens mounting structure 1 moves along the preset trajectory. Second, when connecting the moving rod 2 to the mounting part 12, it is only necessary to insert the moving rod 2 through the opening of the mounting part 12, improving the ease and speed of installation.

[0067] In this embodiment, the number of movable rods 2 is one or more, and the number of piezoelectric ceramics 3 corresponds to the number of movable rods 2.

[0068] In this embodiment, a guide rod 13 is also included. The lens mounting structure 1 is slidably connected to the guide rod 13, and the length direction of the guide rod 13 is consistent with the movement direction of the moving rod 2. The advantages of this structure are: First, the guide rod 13 can force the lens mounting structure 1 to move along a single axis (i.e., the length direction of the guide rod 13), eliminating unexpected movement trajectories such as lateral offset or rotation, ensuring that the vibration direction is completely consistent with the predetermined direction, avoiding the loss of ultrasonic vibration energy generated by the piezoelectric ceramic 3 in non-target directions, thereby efficiently improving the vibration efficiency of the lens mounting structure 1. Second, under temperature changes or mechanical impact, the guide rod 13 can maintain the stability of the movement trajectory of the lens mounting structure 1, avoiding structural displacement caused by thermal expansion or impact.

[0069] In this embodiment, the lens can be arranged in several ways. Two of these arrangements are listed below. The first arrangement is that the lens is disposed in the first through hole 11. The second arrangement is that the lens is disposed on the top surface of the lens mounting structure 1, and the center point of the lens is on the same straight line as the center point of the first through hole 11.

[0070] Specifically, when the lens is positioned in the first through-hole 11, the inner wall of the first through-hole 11 is a smooth curved surface. After the piezoelectric ceramic 3 drives the moving rod 2 to generate high-frequency vibration, the vibration energy is transmitted to the lens mounting structure 1 through the moving rod 2, and then acts on the outer wall of the lens inserted therein through the vibration of the inner wall of the first through-hole 11. It is necessary to ensure that the contact surface between the outer wall of the lens and the inner wall of the first through-hole 11 can efficiently transmit vibration while avoiding energy loss. Therefore, setting the inner wall of the first through-hole 11 as a smooth curved surface serves two purposes: First, the smooth surface of the inner wall of the first through-hole 11 reduces the sliding friction between the outer wall of the lens and the inner wall of the first through-hole 11, preventing vibration energy from being converted into heat or noise, and ensuring that more energy is transferred to the surface of the lens. Second, the smooth surface of the inner wall of the first through-hole 11 allows the vibration wave to diffuse evenly along the outer wall of the lens, avoiding localized stress concentration that could lead to lens deformation or breakage due to uneven stress on the lens. Third, if the inner wall of the first through-hole 11 is rough, the outer wall of the lens may be scratched due to repeated friction under high-frequency vibration. A smooth inner wall can significantly reduce this risk. Simultaneously, reducing friction can slow down the wear rate of the lens's outer wall, preventing the tolerance between the first through-hole 11 and the lens from increasing over time (e.g., widening the gap between the first through-hole 11 and the lens), thus affecting the stability of vibration transmission. Fourth, the smooth contact surface of the inner wall of the first through-hole 11 reduces the damping effect on high-frequency vibration (ultrasonic waves from the piezoelectric ceramic 3), making it easier to achieve high-frequency vibration modes.

[0071] In this embodiment, the inner wall of the first through hole 11 is provided with multiple hole-like structures 111, which are spaced at predetermined intervals. The functions of the hole-like structures 111 are: 1. By locally reducing the stiffness of the lens mounting structure 1, the hole-like structures 111 allow for a more precise match in the driving frequencies between the lens mounting structure 1, the moving rod 2, and the piezoelectric ceramic 3. 2. The hole-like structures 111 disperse the propagation path of the ultrasonic vibrations generated by the piezoelectric ceramic 3 within the inner wall of the first through hole 11, preventing energy concentration in a localized area and allowing for more uniform transmission of vibration energy to the lens. 3. The hole-like structures 111 increase the effective heat dissipation area of ​​the inner wall of the first through hole 11, accelerating heat dissipation during operation of the lens mounting structure 1. 5. The hole-like structures 111 can alter the acoustic impedance, absorbing noise generated by vibration. 6. The hole-like structures 111 can also be used to install the aforementioned mounting part 12. For example, by providing threads on the inner wall of the hole-like structures 111, the mounting part 12 can be installed on the side wall of the lens mounting structure 1 using a screw or other connecting component.

[0072] In this embodiment, a housing 4 is also included, with a second through hole 41 penetrating the top and bottom surfaces of the housing 4. The lens mounting structure 1, the moving rod 2, and the piezoelectric ceramic 3 are disposed inside the housing 4. Specifically, an installation space 42 is provided between the top surface of the housing 4 and the top surface of the lens mounting structure 1, and the lens is disposed in the installation space 42. That is, whether the lens is disposed on the top surface of the lens mounting structure 1 or in the first through hole 11 (if the lens is a convex lens, the lens will protrude from the first through hole 11), the installation space 42 can reserve a certain position for the installation of the lens.

[0073] Specifically, in this embodiment, a perforation 43 is provided on the inner wall of the top surface of the housing 4. The size of the perforation 43 matches the size of the moving rod 2, and the end of the moving rod 2 away from the piezoelectric ceramic 3 is movably disposed in the perforation 43. The function of providing the perforation 43 is as follows: First, the guide rod 13 has already initially constrained the movement direction of the lens mounting structure 1. The perforation 43 can further restrict the degree of freedom of the end of the moving rod 2 away from the piezoelectric ceramic 3 in the non-predetermined direction (lateral direction), preventing the slight sway of the moving rod 2 under high-frequency vibration, thereby ensuring that the vibration energy can be transmitted completely along the predetermined direction. Second, the contact surface between the moving rod 2 and the perforation 43 can be designed as a low-friction material (such as a polytetrafluoroethylene coating), which can reduce sliding resistance and prevent vibration energy from being converted into heat energy loss through friction, ensuring that the driving force of the piezoelectric ceramic 3 is maximized into effective vibration of the lens mounting structure 1.

[0074] In this embodiment, the housing 4 includes a base 44 and a cover 45. One end of the base 44 is open, and the cover 45 is detachably fitted into the opening. The second through hole 41 includes a first sub-through hole 411 and a second sub-through hole 412. The first sub-through hole 411 penetrates both sides of the cover 45, and the through hole 43 also penetrates both sides of the cover 45. The second sub-through hole 412 penetrates both sides of the base 44. The advantage of this detachable structure is that when the moving rod 2, piezoelectric ceramic 3, or lens mounting structure 1 inside the housing 4 is damaged, the entire structure does not need to be scrapped; individual parts can be replaced, thereby reducing maintenance costs.

[0075] Specifically, a groove-shaped structure 441 is provided on the inner wall of the base 44. The size of the groove-shaped structure 441 matches the size of the piezoelectric ceramic 3, and the piezoelectric ceramic 3 is disposed in the groove-shaped structure 441. When multiple piezoelectric ceramics 3 are stacked to form a piezoelectric stack, the groove-shaped structure 441 has a certain depth to accommodate the piezoelectric stack.

[0076] More specifically, it also includes a plate-like structure 442, which is disposed on the inner wall of the base 44 and blocks part of the opening of the groove-like structure 441, thereby restricting the displacement of the piezoelectric ceramic 3 during high-frequency vibration within the space enclosed by the plate-like structure 442 and the groove-like structure 441.

[0077] In this embodiment, the lens mounting structure 1 and the plate structure 442 are both cubic in shape. Of course, the lens mounting structure 1 and the plate structure 442 can also be circular, cuboid, etc., which are not limited here and are determined by the actual working conditions.

[0078] The working principle of this utility model is described below to facilitate a better understanding of it:

[0079] When focusing is required, a voltage is applied to the piezoelectric ceramic 3. The crystal structure of the piezoelectric ceramic 3 undergoes periodic deformation due to the electric field (positive voltage causes the piezoelectric ceramic 3 to expand, and negative voltage causes it to contract). This deformation manifests as the material stretching or bending in a specific direction, with the deformation amount proportional to the voltage amplitude and the vibration frequency matching the driving voltage frequency. Although this deformation is minute (typically on the micrometer scale), the frequency can reach several kilohertz, forming high-frequency vibration. The deformation of the piezoelectric ceramic 3 directly drives the moving rod 2; that is, when the driving voltage is a high-frequency AC signal, the piezoelectric ceramic 3 vibrates at the same frequency, driving the moving rod 2 in a high-frequency reciprocating motion. The reciprocating motion of the moving rod 2 then drives the lens mounting structure 1 to move back and forth. This high-frequency vibration is ultimately transmitted to the lens, and combined with the optical feedback system, the focus position is adjusted in real time, ultimately achieving micrometer-level precise autofocus. Simultaneously, water droplets on the lens detach due to inertia or changes in surface tension, achieving a simple water removal effect.

[0080] Please refer to Figures 5-6 , Figure 5 This is a cross-sectional schematic diagram of the second embodiment of the present invention. Figure 6 This is an enlarged schematic diagram of the structure at point B. The difference between the second embodiment and the first embodiment lies in the improved arrangement of the piezoelectric ceramic and the moving rod.

[0081] In this embodiment, when not in focus, the piezoelectric ceramic 3 and the moving rod 2 do not contact each other. One surface of the piezoelectric ceramic 3 is separated from one end of the moving rod 2 by a first distance L1, which is less than the deformation distance when one surface of the piezoelectric ceramic 3 deforms. In the second configuration, the first distance L1 between one surface of the piezoelectric ceramic 3 and one end of the moving rod 2 can be achieved by placing a spring (not shown in the figure) below the lens mounting structure 1. The length of the spring is the same as the aforementioned first distance L1, thus separating one surface of the piezoelectric ceramic 3 from one end of the moving rod 2 by the first distance L1. Of course, other methods can also be used to separate the moving rod 2 and the piezoelectric ceramic 3 by the first distance L1, which is not limited here. Based on the premise that the first distance L1 is less than the deformation distance when one surface of the piezoelectric ceramic 3 deforms, when the optical zoom ultrasonic motor 100 focuses, the deformation of the piezoelectric ceramic 3 will inevitably drive the moving rod 2 to vibrate synchronously at high frequency, and finally transmit this high-frequency vibration to the lens mounting structure 1.

[0082] Other technical features and effects are the same as in the first embodiment, and will not be repeated here. Please refer to the description for details. Figures 1-4 Explanation.

[0083] Please refer to Figures 7-9 , Figure 7 This is an exploded structural diagram of the third embodiment of the present invention. Figure 8 This is a three-dimensional structural diagram of lens mounting structure 1. Figure 9 This is a cross-sectional schematic diagram of the optical zoom ultrasonic motor 100. The difference between the third embodiment and the first embodiment lies in the improved connection method between the moving rod 2 and the lens mounting structure 1, specifically:

[0084] In this embodiment, the movable rod 2 is slidably connected to the lens mounting structure 1. Specifically, in this embodiment, one surface of the piezoelectric ceramic 3 is connected to one end of the movable rod 2. A first elastic element 5 is also included, located between the piezoelectric ceramic 3 and the lens mounting structure 1, with both ends of the first elastic element 5 contacting the piezoelectric ceramic 3 and the lens mounting structure 1, respectively.

[0085] When a positive voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 expands, meaning the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually decreases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves upwards. The first elastic element 5, sleeved on the moving rod 2, also presses against the lens mounting structure 1 as the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 decreases, applying an upward force to the lens mounting structure 1. During the continuous expansion of the piezoelectric ceramic 3, the first elastic element 5 is compressed (its length shortens). The first elastic element 5 attempts to return to its natural length, therefore, it applies an outward pushing force to both ends. Specifically, the upper end of the first elastic element 5 applies an upward pushing force to the lens mounting structure 1, attempting to push the upward-facing lens mounting structure 1 away from itself, while the lower end of the first elastic element 5 applies a downward pushing force to the piezoelectric ceramic 3, attempting to push the piezoelectric ceramic 3 downwards away from itself.

[0086] When a reverse voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 contracts, meaning the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually increases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves downwards, and the first elastic element 5, sleeved on the moving rod 2, also pulls the lens mounting structure 1 downwards as the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 increases. During the continuous contraction of the piezoelectric ceramic 3, the first elastic element 5 is stretched (its length increases). The first elastic element 5 attempts to return to its natural length, therefore, it applies an inward pulling force to both ends. Specifically, the upper end of the first elastic element 5 applies a downward pulling force to the lens mounting structure 1, attempting to pull the lens mounting structure 1 closer to itself, while the lower end of the first elastic element 5 applies an upward pulling force to the piezoelectric ceramic 3, attempting to pull the piezoelectric ceramic 3 closer to itself.

[0087] Therefore, when the piezoelectric ceramic 3 is periodically expanding and contracting, the first elastic element 5 will also alternately compress and stretch, thereby applying periodic pushing and pulling forces to the lens mounting structure 1, ultimately causing the lens mounting structure 1 to vibrate at high frequency, so as to achieve a fast and accurate focusing effect on the lens.

[0088] Specifically, in this embodiment, the first elastic element 5 is a spring. Other elastic elements may also be included, but are not limited here.

[0089] In this embodiment, a sliding structure 14 is also included. The sliding structure 14 is disposed on the lens mounting structure 1, and the moving rod 2 cooperates with the sliding structure 14, with the sliding structure 14 sliding on the moving rod 2. Specifically, in this embodiment, the sliding structure 14 is a sliding clamping structure 141, which is disposed on the lens mounting structure 1, specifically on the side wall of the lens mounting structure 1. The sliding clamping structure 141 is basically U-shaped, so the two ends of the sliding clamping structure 141 enclose a clamping space 1411, in which a sliding groove 14111 is provided, and the moving rod 2 is disposed in the sliding groove 14111. In this embodiment, when viewed from directly above the sliding groove 14111, the sliding groove 14111 is triangular in shape. Of course, the sliding groove 14111 can also be circular, square, etc., depending on the actual working conditions, and is not limited here.

[0090] Therefore, after the sliding clamping structure 141 is set, when the piezoelectric ceramic 3 is subjected to positive and reverse voltages, the first elastic element 5 will apply periodic pushing and pulling forces to the sliding clamping structure 141, causing the sliding clamping structure 141 to vibrate at high frequency, which in turn drives the lens mounting structure 1 connected to the sliding clamping structure 141 to also vibrate at high frequency, thereby achieving a fast and accurate focusing effect on the lens.

[0091] Other technical features and effects are the same as in the first embodiment, and will not be repeated here. Please refer to the description for details. Figures 1-4 Explanation.

[0092] Please refer to Figures 10-12 , Figure 10 This is an exploded structural diagram of the fourth embodiment of the present invention. Figure 11 This is a three-dimensional structural diagram of lens mounting structure 1. Figure 12 This is a cross-sectional schematic diagram of the optical zoom ultrasonic motor 100. The difference between the fourth embodiment and the third embodiment is that the overall structure of the sliding structure 14 has been changed, specifically:

[0093] In this embodiment, the sliding structure 14 is a slider 142, which is disposed on the lens mounting structure 1, specifically on the side wall of the lens mounting structure 1. A first sliding through hole 1421 is provided through the slider 142. The length direction of the first sliding through hole 1421 is consistent with the moving direction of the moving rod 2, and the diameter of the first sliding through hole 1421 is slightly larger than the size of the moving rod 2. The moving rod 2 is movably inserted through the first sliding through hole 1421. The advantage of this structure is that the slider 142 bears all the frictional load, and the lens mounting structure 1 only serves as a static support, avoiding the risk of wear on the lens mounting structure 1.

[0094] Therefore, when a positive and reverse voltage is applied to the piezoelectric ceramic 3, the first elastic element 5 will apply periodic pushing and pulling forces to the slider 142, causing the slider 142 to vibrate at high frequency, which in turn drives the lens mounting structure 1 connected to the slider 142 to also vibrate at high frequency, thereby achieving a fast and accurate focusing effect on the lens.

[0095] Other technical features and effects are the same as in the third embodiment, and will not be repeated here. Please refer to the description for details. Figures 7-9 Explanation.

[0096] Please refer to Figures 13-15 , Figure 13 This is an exploded structural diagram of the fifth embodiment of the present invention. Figure 14 This is a three-dimensional structural diagram of lens mounting structure 1. Figure 15 This is a cross-sectional schematic diagram of the optical zoom ultrasonic motor 100. The difference between the fifth embodiment and the third embodiment is that the overall structure of the sliding structure 14 has been changed, specifically:

[0097] In this embodiment, the sliding structure 14 is a second sliding through hole 143, which is disposed on the lens mounting structure 1. Specifically, the second sliding through hole 143 penetrates both the upper and lower surfaces of the lens mounting structure 1, and the diameter of the second sliding through hole 143 is slightly larger than the size of the moving rod 2. The moving rod 2 is movably inserted into the second sliding through hole 143. Therefore, when the piezoelectric ceramic 3 performs periodic expansion and contraction, the first elastic element 5 also alternately compresses and stretches, thereby directly applying periodic pushing and pulling forces to the lens mounting structure 1, causing the lens mounting structure 1 to vibrate at high frequency, thereby achieving a fast and accurate focusing effect on the lens. The advantage of this structure is that the moving rod 2 and the lens mounting structure 1 can be slidably connected without the need for additional mounting parts, which can reduce the manufacturing cost of the optical zoom ultrasonic motor 100.

[0098] Other technical features and effects are the same as in the third embodiment, and will not be repeated here. Please refer to the description for details. Figures 7-9 Explanation.

[0099] Please refer to Figures 16-17 , Figure 16 This is a cross-sectional schematic diagram of one arrangement of the blocking part in the sixth embodiment of this utility model. Figure 17 This is a cross-sectional schematic diagram of another arrangement of the blocking part in the sixth embodiment of this utility model. The difference between the sixth embodiment and the third embodiment is that the structure of the moving rod 2 has been changed, and the first elastic member 5 in the third embodiment has been removed. Specifically:

[0100] Please refer to Figure 16In this embodiment, a stop 6 is also included, which is disposed on the moving rod 2 and located below the lens mounting structure 1. When a positive voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 expands, that is, the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually decreases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves upward. The stop 6 located below the lens mounting structure 1 also abuts against the lens mounting structure 1 as the moving rod 2 moves upward, and applies an upward force to the lens mounting structure 1, thereby causing the lens mounting structure 1 to move upward. When a reverse voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 contracts, that is, the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually increases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves downward, causing the stop 6 to move downward along with the moving rod 2. At this time, the lens mounting structure 1 moves downward under its own gravity. Therefore, when the piezoelectric ceramic 3 performs periodic expansion and contraction, the lens mounting structure 1 performs high-frequency up-and-down reciprocating movement (i.e., high-frequency vibration). This structure is suitable for use when the optical zoom ultrasonic motor 100 is placed flat.

[0101] Please refer to Figure 17 Furthermore, there can be two abutment parts 6, each disposed on the moving rod 2. One abutment part 6 is located below the lens mounting structure 1, and the other abutment part 6 is located above the lens mounting structure 1. When a positive voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 expands, meaning the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually decreases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves upward. The abutment part 6 located below the lens mounting structure 1 also abuts against the lens mounting structure 1 as the moving rod 2 moves upward, applying an upward force to the lens mounting structure 1, thereby causing the lens mounting structure 1 to move upward. When a reverse voltage is applied to the piezoelectric ceramic 3, the piezoelectric ceramic 3 contracts, meaning the distance between the piezoelectric ceramic 3 and the lens mounting structure 1 gradually increases. The moving rod 2 connected to the piezoelectric ceramic 3 gradually moves downward. The abutment part 6 located above the lens mounting structure 1 also applies a downward force to the lens mounting structure 1 as the moving rod 2 moves downward, thereby causing the lens mounting structure 1 to move downward. Therefore, when the piezoelectric ceramic 3 is periodically expanding and contracting, the lens mounting structure 1, under the action of the two blocking parts 6, performs high-frequency up-and-down reciprocating movement (i.e., high-frequency vibration), thereby achieving a fast and accurate focusing effect on the lens.

[0102] Other technical features and effects are the same as in the third embodiment, and will not be repeated here. Please refer to the description for details. Figures 7-9 Explanation.

[0103] Please refer to Figure 18 , Figure 18This is a three-dimensional structural diagram of the cover 45 in the seventh embodiment of the present invention. The difference between the seventh embodiment and the first embodiment is that a different structure is used to replace the perforation 43, specifically:

[0104] In this embodiment, a clearance space 46 is provided on the inner wall of the top surface of the housing 4 (specifically, the inner wall of the cover 45), and the end of the moving rod 2 away from the piezoelectric ceramic 3 is movably disposed in the clearance space 46. As a preferred embodiment, a blind hole 47 is provided on the inner wall of the top surface of the housing 4, specifically the inner wall of the cover 45, and the inner wall and bottom surface of the blind hole 47 surround the aforementioned clearance space 46. Compared to the perforation 43, the blind hole 47 serves to prevent the risk of external solid particles entering the interior of the housing 4.

[0105] Furthermore, a second elastic element (not shown in the figure) is provided in the blind hole 47. The end of the moving rod 2 away from the piezoelectric ceramic 3 abuts against the second elastic element. The second elastic element can further enhance the vibration of the moving rod 2 on the one hand, and avoid repeated impacts on the bottom surface of the blind hole 47, thus preventing wear on the blind hole 47.

[0106] Other technical features and effects are the same as in the first embodiment, and will not be repeated here. Please refer to the description for details. Figures 1-4 Explanation.

Claims

1. An optically zoomed ultrasonic motor characterized by, Comprising: lens mounting structure, moving rod and piezoelectric ceramic, the moving rod is connected with the lens mounting structure, the piezoelectric ceramic is arranged at one end of the moving rod, and one surface of the piezoelectric ceramic corresponds to one end of the moving rod, the first through hole penetrates through the two opposite surfaces of the lens mounting structure, and the lens is arranged on the lens mounting structure; When focusing, one surface of the piezoelectric ceramic deforms, and the force generated by the deformation acts on one end of the moving rod, so that the moving rod moves, and the moving rod further drives the lens mounting structure to move.

2. The optical zoom ultrasonic motor according to claim 1, wherein: the moving rod is fixedly connected with the lens mounting structure.

3. The optical zoom ultrasonic motor according to claim 2, wherein: when not focusing, one surface of the piezoelectric ceramic is in contact with one end of the moving rod.

4. The optical zoom ultrasonic motor according to claim 2, wherein: when not focusing, one surface of the piezoelectric ceramic is spaced from one end of the moving rod by a first distance, and the first distance is less than the deformation distance of one surface of the piezoelectric ceramic when deformed.

5. The optical zoom ultrasonic motor according to claim 1, wherein: the moving rod is in sliding connection with the lens mounting structure.

6. The optical zoom ultrasonic motor according to claim 5, wherein: one surface of the piezoelectric ceramic is connected with one end of the moving rod.

7. The optical zoom ultrasonic motor according to claim 6, wherein: further comprising a first elastic member, the first elastic member is sleeved on the moving rod, and the first elastic member is located between the piezoelectric ceramic and the lens mounting structure.

8. The optical zoom ultrasonic motor according to claim 6, wherein: further comprising a resisting portion, the resisting portion is arranged on the moving rod and located below the lens mounting structure.

9. The optical zoom ultrasonic motor according to any one of claims 5-8, wherein: further comprising a sliding structure, the sliding structure is arranged on the lens mounting structure, the moving rod cooperates with the sliding structure, and the sliding structure slides on the moving rod.

10. The optical zoom ultrasonic motor according to claim 9, wherein: the sliding structure is a sliding block, the sliding block is provided with a first sliding through hole, the sliding block is arranged on the lens mounting structure, and the moving rod is arranged in the first sliding through hole.

11. The optical zoom ultrasonic motor according to claim 9, wherein: the sliding structure is a second sliding through hole, the second sliding through hole is arranged on the lens mounting structure, and the moving rod is arranged in the second sliding through hole.

12. The optical zoom ultrasonic motor according to claim 9, wherein: the sliding structure is a sliding clamping structure, the sliding clamping structure is arranged on the lens mounting structure, a sliding groove is arranged in a clamping space of the sliding clamping structure, and the moving rod is arranged in the sliding groove.

13. The optical zooming ultrasonic motor according to claim 1, wherein: a guide rod is further included, and the lens mounting structure is in sliding connection with the guide rod.

14. The optical zooming ultrasonic motor according to claim 1, wherein: the lens is disposed in the first through hole.

15. The optical zooming ultrasonic motor according to claim 1, wherein: the lens is fixed on the top surface of the lens mounting structure.

16. The optical zooming ultrasonic motor according to claim 1, wherein: a housing is further included, a second through hole is formed through the top surface and the bottom surface of the housing, and the lens mounting structure, the moving rod and the piezoelectric ceramic are disposed inside the housing.

17. The optical zooming ultrasonic motor according to claim 16, wherein: an installation space is formed between the top surface of the housing and the top surface of the lens mounting structure, and the lens is disposed in the installation space.

18. The optical zooming ultrasonic motor according to claim 16, wherein: a relief space is formed on the inner wall of the top surface of the housing, and the end of the moving rod away from the piezoelectric ceramic is movably disposed in the relief space.

19. The optical zooming ultrasonic motor according to claim 18, wherein: a blind hole is formed on the inner wall of the top surface of the housing, and the inner wall and the bottom surface of the blind hole form the relief space.

20. The optical zooming ultrasonic motor according to claim 16, wherein: a through hole is formed on the inner wall of the top surface of the housing, and the end of the moving rod away from the piezoelectric ceramic is movably disposed in the through hole.

Images