PZT-driven variable aperture and camera
By providing a plurality of prepressure components at both ends of the piezoelectric ceramic, stable prepressure is provided, and the aperture control accuracy problem caused by deformation of the prepressure components in the prior art is solved, thereby achieving more efficient aperture control and imaging quality improvement.
Patent Information
- Application Number
- CN202421570227.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-04
- Publication Date
- 2025-04-25
- Estimated Expiration
- 2034-07-04
AI Technical Summary
The variable aperture driven by existing piezoelectric ceramics may deform the prepressure component during the opening and closing of the drive blade, resulting in deflection or rotation of the prepressure, affecting the aperture regulation accuracy.
At least two prepressing members are provided at both ends of the piezoelectric ceramic, respectively connected to the base, providing stable prepressure, balancing the stress of the piezoelectric ceramic, and avoiding prepressure deflection or rotation caused by deformation of the prepressure member.
Through stable prepressure, the aperture regulation accuracy is improved, the precise control of the aperture size is ensured, and the imaging quality is improved.
Smart Images
Figure CN222800989U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of optical lenses, in particular to a PZT driven variable aperture and a camera. Background Art
[0002] At present, the aperture value of mobile phone lenses is relatively fixed. In an environment with good lighting conditions, the imaging effect of a large aperture lens is not as good as that of a small aperture lens. In an environment with poor lighting conditions, the amount of light entering the small aperture lens cannot meet the camera requirements. Therefore, a variable aperture is derived on the lens motor, which is usually a multi-blade rotating mechanism. The purpose of controlling the aperture size is achieved by rotating the opening and closing of the blades, thereby achieving the effect of controlling exposure.
[0003] Conventional variable apertures are usually driven by voice coils or piezoelectric ceramics (PZT), and the driving method of piezoelectric ceramics is widely cited for its miniaturization and no magnetic interference. However, in the process of driving the blades to open and close, the pre-stressing components of conventional piezoelectric ceramics may deform, causing the pre-stressing components to deflect and rotate on the piezoelectric ceramics, which in turn causes the opening and closing of the blades to deviate, affecting the aperture control accuracy.
[0004] It should be noted that the information disclosed in this background technology section is only intended to increase the understanding of the overall background of the utility model, and should not be regarded as an admission or suggestion in any form that the information constitutes prior art already known to a person skilled in the art. Utility Model Content
[0005] In order to solve the technical problem that the pre-stressing component is easy to deform, resulting in deflection and rotation of the pre-stressing force, the utility model provides a PZT driven variable aperture, which includes a base, piezoelectric ceramics and a rotating carrier.
[0006] The piezoelectric ceramic is arranged on the base, and at least two pre-pressing components are arranged on the piezoelectric ceramic. The two pre-pressing components are arranged opposite to each other on the piezoelectric ceramic, and the two pre-pressing components are respectively connected to the base.
[0007] The rotating carrier is movably arranged on the base, the rotating carrier is movably connected to the piezoelectric ceramic, and the rotating carrier can rotate relative to the base; a plurality of blades are distributed on the rotating carrier, the plurality of blades are respectively transmission-connected to the rotating carrier, and the plurality of blades jointly surround an aperture hole.
[0008] Furthermore, there are four pre-stressing components, and the four pre-stressing components are symmetrically arranged on the piezoelectric ceramic and are respectively connected to the base.
[0009] Furthermore, the PZT driven variable aperture also includes a frame, the frame is connected to the base, a first convex portion is provided on the frame, a first concave portion is provided on the base at a position corresponding to the first convex portion, and the first convex portion is movably connected to the first concave portion.
[0010] Furthermore, a first rolling groove is provided on the base, a second rolling groove is provided on the rotating carrier at a position corresponding to the first rolling groove, and a third rolling groove is provided on the frame at a position corresponding to the first rolling groove. The first rolling groove, the second rolling groove and the third rolling groove together constitute a ball groove, and balls are provided in the ball groove. The balls are rollingly connected with the first rolling groove, the second rolling groove and the third rolling groove respectively.
[0011] Furthermore, there are multiple balls, and the multiple balls together form a ball group.
[0012] Furthermore, a limiting groove is provided on the base, a limiting key is provided on the rotating carrier at a position corresponding to the limiting groove, the length of the limiting key is smaller than the length of the limiting groove, and the limiting key is slidably connected to the limiting groove.
[0013] Furthermore, a first positioning column is provided on the rotating carrier, a blade groove is provided on the blade, and the first positioning column is located in the blade groove and is slidably connected to the blade groove.
[0014] Furthermore, a friction element is provided on the rotating carrier, and the friction element is slidably connected to the piezoelectric ceramic.
[0015] Furthermore, a second positioning column is provided on a side of the frame away from the base, a positioning groove is provided on the blade, and the second positioning column is located in the positioning groove and is rotatably connected to the positioning groove.
[0016] The utility model also provides a camera, comprising any one of the above-mentioned PZT-driven variable apertures.
[0017] Based on the above, the PZT-driven variable aperture and camera provided by the utility model, compared with the prior art, provides a stable pre-stress for the piezoelectric ceramic by relatively arranging at least two pre-stress components at both ends of the piezoelectric ceramic. Compared with a single pre-stress component, it can balance the stress condition of the piezoelectric ceramic, avoid the deflection or rotation of the pre-stress caused by the deformation of the pre-stress component, and thus improve the aperture control accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the prior art descriptions. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. The positional relationship described in the drawings in the following description is based on the direction of the components in the drawings unless otherwise specified.
[0019] Figure 1 A schematic diagram of an exploded structure of a PZT-driven variable aperture provided in one embodiment of the utility model;
[0020] Figure 2 A schematic diagram of the structure of a PZT-driven variable aperture provided in one embodiment of the utility model;
[0021] Figure 3 A schematic diagram of the structure of a piezoelectric ceramic provided in one embodiment of the utility model;
[0022] Figure 4 A schematic diagram of the structure of a base provided in one embodiment of the utility model;
[0023] Figure 5 A schematic diagram of the structure of a rotating carrier provided in one embodiment of the utility model;
[0024] Figure 6 A schematic structural diagram of the bottom of a rotating carrier provided in one embodiment of the utility model;
[0025] Figure 7 A schematic diagram of the structure of the bottom of a frame provided in one embodiment of the utility model;
[0026] Figure 8 for Figure 2 Cross-sectional view at AA in the middle.
[0027] Reference numerals:
[0028] 10-base 20-rotating carrier 30-frame
[0029] 40- piezoelectric ceramics 50- blades 60- aperture
[0030] 70- ball groove 80- ball 90- friction element
[0031] 100-housing 11-circuit board 12-circuit
[0032] 13-first concave portion 14-limiting groove 21-limiting key
[0033] 22-First positioning post 31-First protrusion 32-Second positioning post
[0034] 41- pre-compression member 51- blade groove 52- positioning groove
[0035] 71-first rolling groove 72-second rolling groove 73-third rolling groove DETAILED DESCRIPTION
[0036] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0037] In the description of the present utility model, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used only for descriptive purposes, and cannot be understood as indicating or implying relative importance, or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more. In addition, the term "including" and any variation thereof all mean "at least including".
[0038] See also Figure 1 and Figure 2 , Figure 1 A schematic diagram of an exploded structure of a PZT-driven variable aperture provided in one embodiment of the utility model; Figure 2 A schematic diagram of the structure of a PZT-driven variable aperture provided in one embodiment of the utility model.
[0039] In order to solve the technical problem that the pre-stressing member is easy to deform, causing the pre-stressing force to deflect and rotate, or to achieve at least one of the above advantages or other advantages, an embodiment of the utility model provides a PZT driven variable aperture. As shown in the figure, the PZT driven variable aperture includes a base 10, a rotating carrier 20 and a frame 30.
[0040] Please combine Figure 1 , Figure 2 See also Figure 3 , Figure 4 As shown in the figure, a circuit substrate 11 is disposed in the base 10 for connecting an external power supply and a signal. A piezoelectric ceramic 40 is disposed on the base 10. In a specific implementation, an opening is provided on the base 10, and the piezoelectric ceramic 40 is located in the opening, and the piezoelectric ceramic 40 can contact the rotating carrier 20 through the opening.
[0041] At least two pre-stressing components 41 are provided on the piezoelectric ceramic 40, and the two pre-stressing components 41 are arranged at the two ends of the piezoelectric ceramic 40 opposite to each other, and the two pre-stressing components 41 are respectively connected to the base 10. The pre-stressing components 41 at the two ends can respectively apply a pre-stress toward the rotating carrier 20 to the piezoelectric ceramic, so that the piezoelectric ceramic 40 and the rotating carrier 20 are in stable contact. At the same time, when the piezoelectric ceramic 40 is subjected to a reverse force from the rotating carrier 20, the forces at the two ends of the piezoelectric ceramic 40 are balanced, and the pre-stress caused by the deformation of a single pre-stressing component 41 is avoided, thereby improving the aperture control accuracy.
[0042] Preferably, there are four pre-stressing components 41. The four pre-stressing components 41 are symmetrically arranged at the two ends of the piezoelectric ceramic 41. Four circuits 12 are pre-buried in the base 10, and the two ends of the four pre-stressing components 41 are electrically connected to the piezoelectric ceramic 40 and the circuits 12 respectively. On the one hand, the four pre-stressing components 41 can provide stable pre-stress at the upper and lower ends of the piezoelectric ceramic 40, further avoiding deformation of the pre-stressing components 41. On the other hand, the four pre-stressing components 41 can serve as the power supply and signal circuits of the piezoelectric ceramic 40, without the need to connect additional power supply and signal circuits, which greatly simplifies the process.
[0043] In some preferred embodiments, the pre-stressing member 41 is a pre-stressing spring, which can provide a stable pre-stressing force to the piezoelectric ceramic 40 and can serve as a power supply and signal circuit, thereby simplifying the manufacturing process and reducing costs.
[0044] The rotating carrier 20 is movably arranged on the base and in contact with the piezoelectric ceramic 40. When the piezoelectric ceramic 40 is energized, it can drive the rotating carrier 20 to rotate relative to the base 10. A plurality of blades 50 are distributed on the rotating carrier 20. The plurality of blades 50 are respectively connected to the rotating carrier 20 in a transmission manner, and the plurality of blades 50 jointly surround an aperture 60. When the rotating carrier 20 rotates relative to the base 10, it can drive the plurality of blades 50 to open, close, and gather, so that the size of the aperture 60 changes, thereby achieving the effect of controlling exposure and improving imaging quality.
[0045] Please combine Figure 4 See also Figure 5-Figure 7As shown in the figure, the frame 30 is connected to the base 10. In a specific implementation, the base 10 is provided with a first concave portion 13 and a first rolling groove 71, and the first concave portion 13 and the first rolling groove 71 are connected. A second rolling groove 72 is provided on the rotating carrier 20 at a position corresponding to the first rolling groove 71. The frame 30 is provided with a first convex portion 31 and a third rolling groove 73.
[0046] Combination Figure 5-7 See also Figure 8 As shown in the figure, when the frame 30 is covered on the base 10, the first concave portion 13 and the first convex portion 31 are interlocked, and the first rolling groove 71 corresponds to the second rolling groove 72 and the third rolling groove 73. The first rolling groove 71, the second rolling groove 72 and the third rolling groove 73 together form a ball groove 70, and a ball 80 is arranged in the ball groove 70. The ball 80 is connected to the first rolling groove 71, the second rolling groove 72 and the third rolling groove 73 by rolling, so that the rotating carrier 20 can be driven to rotate relative to the base 10.
[0047] In the specific assembly process, the rotating carrier 20 is assembled on the base 10. At this time, the first rolling groove 71 corresponds to the second rolling groove 72, and the first concave portion 13 is connected to the first rolling groove 81, and the ball 80 can be installed in the first rolling groove 71 through the first concave portion 13. After the ball 80 is assembled, the frame 30 is covered on the base 10. At this time, the third rolling groove 73, the first rolling groove 71, and the second rolling groove 72 together form the ball groove 70, and the ball 80 can roll in the ball groove 70. The first convex portion 31 and the first concave portion 13 are interlocked with each other, and the ball 80 is blocked in the ball groove 70 to prevent the ball 80 from falling off.
[0048] Preferably, there are multiple balls 80, and multiple balls 80 form a ball group, which can effectively disperse stress and avoid the formation of potholes after impact, which may cause the rolling of the balls 80 to become stuck.
[0049] In some preferred embodiments, a limiting groove 14 is provided on the base 10, and a limiting key 21 is provided at a position corresponding to the limiting groove 14 on the rotating carrier 20. The length of the limiting key 21 is less than the length of the limiting groove 14, and the limiting key 21 is slidably connected to the limiting groove 14. When the rotating carrier 20 rotates relative to the base 10, the limiting key 21 rotates synchronously in the limiting groove 14, and when rotating a certain angle, one end of the limiting key 21 abuts against one end of the limiting groove 14, thereby limiting the rotating carrier 20.
[0050] On the basis of the above, the rotating carrier 20 is provided with a first positioning column 22. A second positioning column 32 is provided on the side of the frame 30 away from the base 10. The blade 50 is provided with a blade groove 51 and a positioning groove 52.
[0051] In a specific implementation, the first positioning post 22 is located in the blade slot 51 and is slidably connected to the blade slot 51. The second positioning post 32 is located in the positioning slot 52 and is rotatably connected to the positioning slot 52. Specifically, when the rotating carrier 20 rotates relative to the base 10, the positioning slot 52 on the blade 50 cooperates with the second positioning post 32, and based on the lever principle, the first positioning post 22 slides in the blade slot 51, directing the circumferential force of the rotating carrier 20 to a radial force, thereby driving the blade 50 to open, close, and gather, changing the size of the aperture hole 69, and achieving the effect of controlling the exposure.
[0052] In some preferred embodiments, a friction element 90 is provided on the rotating carrier, and the friction element 90 is slidably connected to the piezoelectric ceramic 40. When the piezoelectric ceramic is energized, the friction element 90 can be driven to move, so that the rotating carrier 20 rotates relative to the base 10, and then the blades 50 are driven to open, close, and gather, so that the size of the aperture 60 changes, thereby achieving the effect of controlling exposure and improving imaging quality.
[0053] Preferably, the friction element 90 is a ceramic friction plate or a ceramic friction head, which can increase the friction between the piezoelectric ceramic 40 and avoid slipping.
[0054] In some preferred embodiments, the PZT driven variable aperture further includes a housing 100 , and the housing 100 covers the base 10 .
[0055] In some preferred embodiments, the utility model further provides a camera, comprising the above-mentioned PZT driven variable aperture.
[0056] To summarize, compared with the prior art, the PZT-driven variable aperture and camera provided by the utility model provide a stable pre-stress for the piezoelectric ceramic by relatively arranging at least two pre-stress components at both ends of the piezoelectric ceramic. Compared with a single pre-stress component, it can balance the stress of the piezoelectric ceramic and avoid the deflection or rotation of the pre-stress caused by the deformation of the pre-stress component, thereby improving the control accuracy of the aperture. At the same time, the pre-stress component can act as a power supply and signal circuit, simplifying the process and reducing production costs.
[0057] Although the term "rotating carrier" and "frame" are often used in this article, the possibility of using other terms is not excluded. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.
[0058] In addition, those skilled in the art should understand that, although there are many problems in the prior art, each embodiment or technical solution of the utility model can be improved in only one or several aspects, without having to solve all the technical problems listed in the prior art or background technology at the same time. Those skilled in the art should understand that the content not mentioned in a claim should not be used as a limitation on the claim.
[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.
Claims
1. A PZT driven variable aperture, characterized in that: include Base; A piezoelectric ceramic, wherein the piezoelectric ceramic is arranged on the base, and at least two pre-pressing components are arranged on the piezoelectric ceramic, the two pre-pressing components are arranged opposite to each other on the piezoelectric ceramic, and the two pre-pressing components are respectively connected to the base; A rotating carrier, wherein the rotating carrier is movably arranged on the base, the rotating carrier is movably connected to the piezoelectric ceramic, and the rotating carrier can rotate relative to the base; a plurality of blades are distributed on the rotating carrier, and the plurality of blades are respectively transmission-connected to the rotating carrier, and the plurality of blades jointly surround an aperture hole.
2. The PZT driven variable aperture according to claim 1, characterized in that: There are four pre-pressing components, which are symmetrically arranged on the piezoelectric ceramic and respectively connected to the base.
3. The PZT driven variable aperture according to claim 1, characterized in that: The PZT driven variable aperture further comprises a frame, the frame is connected to the base, a first convex portion is arranged on the frame, a first concave portion is arranged on the base at a position corresponding to the first convex portion, and the first convex portion is movably connected to the first concave portion.
4. The PZT driven variable aperture according to claim 3, characterized in that: The base is provided with a first rolling groove, the rotating carrier is provided with a second rolling groove at a position corresponding to the first rolling groove, the frame is provided with a third rolling groove at a position corresponding to the first rolling groove, the first rolling groove, the second rolling groove and the third rolling groove together constitute a ball groove, the ball groove is provided with balls, and the balls are respectively rollingly connected with the first rolling groove, the second rolling groove and the third rolling groove.
5. The PZT driven variable aperture according to claim 4, characterized in that: The number of the balls is multiple, and the multiple balls together form a ball group.
6. The PZT driven variable aperture according to claim 1, characterized in that: A limiting groove is arranged on the base, and a limiting key is arranged on the rotating carrier at a position corresponding to the limiting groove. The length of the limiting key is smaller than the length of the limiting groove, and the limiting key is slidably connected to the limiting groove.
7. The PZT driven variable aperture according to claim 4, characterized in that: The rotating carrier is provided with a first positioning column, the blade is provided with a blade groove, and the first positioning column is located in the blade groove and is slidably connected with the blade groove.
8. The PZT driven variable aperture according to claim 1, characterized in that: The rotating carrier is provided with a friction element, and the friction element is slidably connected with the piezoelectric ceramic.
9. The PZT driven variable aperture according to claim 7, characterized in that: A second positioning column is provided on one side of the frame away from the base, a positioning groove is provided on the blade, and the second positioning column is located in the positioning groove and is rotatably connected to the positioning groove.
10. A camera, characterized in that: It comprises the PZT driven variable aperture as described in any one of claims 1 to 9.