Piezoelectric PTZ

Abstract

The present invention discloses a piezoelectric pan / tilt, comprising a housing, a spring, a carrier, a frame, a piezoelectric mechanism, a circuit module and a base. The housing and the base are connected to form a hollow cavity. The spring, the carrier, the frame, the piezoelectric mechanism and the circuit module are arranged in the hollow cavity, wherein the piezoelectric mechanism is arranged on the base and electrically connected to the circuit module, the spring is arranged between the base and the frame and the base and the frame are movably connected, and the carrier is fixedly connected in the frame and used to install the lens module. The present invention realizes pan / tilt driving through a piezoelectric mechanism, and has the beneficial technical effects of fast response speed, large power output and low power consumption.

Description

Technical Field

[0001] The present invention relates to the field of pan / tilt platforms, and in particular to a piezoelectric pan / tilt platform. Background Art

[0002] In recent years, mobile devices with fixed-focus wide-angle (viewing angle over 80 degrees) shooting functions have become very popular, and their application scope has been expanding, including aerial photography, sports cameras, and dashcams. When taking photos and videos, it is very likely to be affected by external vibrations, causing blur or shaking, affecting the quality of photos and videos. This problem will be more serious when the vibration is more intense or in low light conditions.

[0003] In order to solve the above problems, many existing anti-shake technologies have appeared in the market. The mainstream existing technologies read vibration sensors (such as gyroscopes and acceleration sensors), calculate the vibration waveform and the required compensation angle, and compensate for the image blur and shaking caused by vibration through electronic, optical, or mechanical methods to achieve the effect of improving image quality.

[0004] The existing technology mainly includes an electronic image stabilizer (EIS) and an optical image stabilizer (OIS) according to the vibration compensation method.

[0005] EIS is an electronic method to achieve the anti-shake effect. When shooting, EIS will adjust the position of each frame of the image according to the calculated vibration waveform to offset the image shake caused by vibration. Since EIS does not require additional actuators, the main advantages of EIS are low cost and no additional weight and volume. The main disadvantage of EIS is that it cannot compensate for the image shake in each frame. This is because EIS offsets the image shake caused by vibration by adjusting the position of each image. Therefore, the image taken after EIS is turned on will be more likely to be blurred due to image shake. Another disadvantage of EIS is that the resolution of the image sensor is sacrificed. When EIS is turned on, the image sensor or image processor needs to cut the appropriate image according to the calculated vibration waveform as the final image. During the cutting process, the resolution will decrease, and the final image will be lower than the maximum resolution of the image and sensor. Therefore, EIS will sacrifice the maximum resolution of the image sensor and reduce the image quality. Compared with EIS, the main disadvantage of OIS is that it requires additional actuators, so it requires higher additional costs, larger additional space, and higher additional weight.

[0006] OIS uses an actuator to move an optical component (which can be a lens, a group of lenses, or all lenses in a camera) through optical and mechanical methods to achieve relative movement between the optical component and the image sensor, change the optical path and the position of the image circle, and offset the image shake caused by vibration. Since OIS continuously makes optical compensation in each frame of the image, it can offset the shake of each frame of the image when it is exposed, and can achieve better image quality than EIS. The main disadvantage of OIS is that it sacrifices part of the optical resolution of the lens. During the OIS process, the position of the image circle on the image sensor will continue to change. In order to prevent the image circle from exceeding the image sensor during the OIS process, the image circle must be expanded due to OIS, but this will waste the resolution that the lens should have. On the other hand, during the OIS process, when the position of the image circle is more biased, the edge of the image circle will be closer to the image sensor. Since the blur and distortion at the edge of most lenses are more serious than the center, the image resolution and anti-shake effect of OIS are generally not as good as GS. This problem is more obvious in wide-angle camera modules. Summary of the invention

[0007] The purpose of the present invention is to provide a piezoelectric cloud sky to solve the problems existing in the above-mentioned prior art.

[0008] In order to solve the above-mentioned problem, according to one aspect of the present invention, a piezoelectric pan-tilt is provided, which includes a shell, a spring, a carrier, a frame, a piezoelectric mechanism, a circuit module and a base, wherein the shell and the base are connected to form a hollow cavity, and the spring, the carrier, the frame, the piezoelectric mechanism and the circuit module are arranged in the hollow cavity, wherein the piezoelectric mechanism is arranged on the base and electrically connected to the circuit module, the spring is arranged between the base and the frame and movably connects the base and the frame, and the carrier is fixedly connected to the frame and is used to install a lens module.

[0009] In one embodiment, the piezoelectric pan-tilt head further includes a support block, wherein the support block is fixedly connected to the base, and the spring sheet movably connects the support block and the frame.

[0010] In one embodiment, the spring sheet is provided with a support block connecting sheet and a frame connecting sheet, the support block connecting sheet and the frame connecting sheet are arranged at intervals and connected by spring wires, the support block connecting sheet is fixedly connected to the support block, and the frame connecting sheet is fixedly connected to the frame.

[0011] In one embodiment, the spring sheet is provided with three support block connecting sheets and three frame connecting sheets, and the three support block connecting sheets and the three frame connecting sheets are arranged at intervals.

[0012] In one embodiment, the frame as a whole forms a triangular frame, and the piezoelectric pan-tilt platform includes three piezoelectric mechanisms, and three vertices of the triangular frame are respectively connected to the three piezoelectric mechanisms.

[0013] In one embodiment, a carrier mounting hole is provided in the middle of the frame to mount the carrier, and the carrier mounting hole is formed in a rectangular shape.

[0014] In one embodiment, a reed installation groove is further provided on the end corner of the triangular frame, and the frame connecting piece of the reed is installed in the reed installation groove.

[0015] In one embodiment, the piezoelectric mechanism includes a counterweight block, a deformation block, a friction rod, a first spring sheet, a second spring sheet and a movable seat, the counterweight block is arranged on the base, the deformation block is arranged on the upper end of the counterweight block, the friction rod is arranged on the upper end of the deformation block, the circuit module is electrically connected to the deformation block, the first spring sheet, the second spring sheet and the movable seat are combined and the movable seat is connected to the friction rod.

[0016] In one embodiment, an arc groove is provided at one end of the movable seat, and the second spring sheet is arranged on the inner side of the arc groove. The middle part of the second spring sheet is in a curved arc shape. One end of the second spring sheet is connected to one end of the arc groove, and the other end of the second spring sheet is provided with an abutment portion. The abutment portion contacts the other end surface of the arc groove, and the two ends of the arc groove apply an outward elastic force to the second spring sheet.

[0017] In one embodiment, a supporting portion and a limiting block are provided on the movable seat, the first spring piece is embedded between the limiting block and the arc groove, the other end of the first spring piece is located on the supporting portion, the movable seat supports the first spring piece through the supporting portion, and the movable seat applies an inward elastic force to the first spring piece through the limiting block.

[0018] In one embodiment, one end of the first spring sheet is in a curved shape, and the curved shape of one end of the first spring sheet and the curved shape of the middle part of the second spring sheet are respectively squeezed on the inner and outer sides of the friction rod, and the first spring sheet and the second spring sheet clamp the friction rod, thereby connecting the friction rod to the movable seat.

[0019] In one embodiment, a top column is provided at the top of the movable seat, a piezoelectric mechanism mounting hole is provided at the bottom of the frame, the top column is inserted into the piezoelectric mechanism mounting hole, and when the friction rod drives the movable seat to move, the movable seat pushes the frame and the carrier to move.

[0020] The present invention drives the frame and the carrier to move through a piezoelectric mechanism, has a fast response speed, has no mechanical fit gap, can realize voltage follower displacement control, and can also provide a large force output, low power consumption, and almost no power consumption of the device. At the same time, it is easy to realize closed-loop control of power supply, side position sensor, microcomputer, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional exploded view of a piezoelectric pan / tilt platform according to an embodiment of the present invention.

[0022] Figure 2 This is a three-dimensional diagram of a piezoelectric pan-tilt head according to an embodiment of the present invention with some components removed.

[0023] Figure 3 It is a three-dimensional exploded view of a piezoelectric mechanism according to an embodiment of the present invention.

[0024] Figure 4 is a three-dimensional diagram of a piezoelectric mechanism according to an embodiment of the present invention.

[0025] Figure 5 and Figure 6 They are different perspective views of a frame according to an embodiment of the present invention.

[0026] Figure 7 It is a three-dimensional diagram of a reed according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0028] In the following description, certain specific details are set forth for the purpose of illustrating the various disclosed embodiments to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0029] References throughout the specification to "one embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0030] In the following description, in order to clearly show the structure and working mode of the present invention, many directional words will be used for description, but the words "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0031] The present invention generally relates to a piezoelectric gimbal for use in combination with a lens module, and the piezoelectric gimbal is used in conjunction with the lens module to achieve a better anti-shake effect. Specifically, the lens module itself can have an OIS anti-shake function. The gimbal of the present invention drives the entire lens module including the lens and the image sensor through a mechanical method to make a movement in the opposite direction to the vibration but with a similar amplitude to offset the shaking caused by the vibration. During the anti-shake process, since there is no relative movement between the optical components and the image sensor, the image quality and anti-shake effect will not decrease at the edge of the image, and there is no need to sacrifice part of the optical resolution of the lens and part of the resolution of the image sensor due to anti-shake.

[0032] Figure 1 is a three-dimensional exploded view of a piezoelectric pan / tilt platform according to an embodiment of the present invention. Figure 2 FIG. 1 is a three-dimensional diagram of a piezoelectric pan-tilt platform according to an embodiment of the present invention after some components are removed. Figure 1-2 As shown, the piezoelectric pan / tilt 100 includes a housing 10, a spring 20, a carrier 30, a frame 40, a piezoelectric mechanism 60, a circuit module 70 and a base 80. The housing 10 and the base 20 are connected to form a hollow cavity. The spring 20, the carrier 30, the frame 40, the piezoelectric mechanism 60 and the circuit module 70 are arranged in the hollow cavity. The piezoelectric mechanism 60 is arranged on the base 80, and the piezoelectric mechanism 60 is powered by the circuit module 70. The piezoelectric mechanism 60 drives the frame 40 to reciprocate up and down. The spring 20 connects the base 80 and the frame 40 directly or indirectly, and is used to reset the frame 40. The carrier 30 is fixedly connected in the frame 40. The carrier 30 is used to install the lens module 90, and the longitudinal movement of the lens module 90 is driven by the piezoelectric mechanism 60.

[0033] The present invention drives the carrier and lens module of the pan / tilt head to move through a piezoelectric mechanism. Compared with traditional electromagnetic drive, it has higher precision and reliability. Combined with the anti-shake function of the lens module, it can greatly improve the optical anti-shake performance and achieve higher imaging quality.

[0034] At the same time, the frame and carrier are driven to move by a piezoelectric mechanism, which has the advantages of fast response speed, no mechanical fit gap, and voltage-following displacement control. It can also provide a large power output, low power consumption, and almost no power consumption of the device. In addition, it is easy to realize closed-loop control of power supply, side position sensor, microcomputer, etc.

[0035] Optionally, the circuit module 70 includes a first part 71 and a second part 72, the first part 71 is disposed in the base 80 and arranged below the frame 40, and the second part 72 is arranged outside the base 80 and is used to connect with an external circuit. The first part 71 can be provided with an imaging chip, and the lens module 90 cooperates with the imaging chip.

[0036] Optionally, the piezoelectric pan-tilt stage 100 further includes a plurality of support blocks 50, which are fixedly disposed in the base 80 and arranged around the frame 40, and the springs 20 movably connect the support blocks 50 and the frame 40. The frame 40 is supported by the support blocks 50, so that a space for placing the first portion 71 of the circuit module 70 is formed between the frame 40 and the base 80, so that the piezoelectric pan-tilt stage 70 has a compact structure and high reliability.

[0037] Figure 3 is a three-dimensional exploded view of a piezoelectric mechanism according to an embodiment of the present invention, Figure 4 FIG. 1 is a three-dimensional diagram of a piezoelectric mechanism according to an embodiment of the present invention. Figure 3-4 As shown, in one embodiment, the piezoelectric mechanism 60 includes a counterweight block 61, a deformation block 62, a friction rod 63, a first spring piece 64, a second spring piece 65 and a movable seat 66. The counterweight block 61 is arranged inside the base 80, the deformation block 62 is arranged on the upper end of the counterweight block 61, and the friction rod 63 is arranged on the upper end of the deformation block 62. The circuit module 70 is used to power and cut off the power supply to the deformation block 62 to realize the longitudinal telescopic movement of the friction rod 63. The first spring piece 64, the second spring piece 65 and the movable seat 66 are combined to realize the connection operation between the movable seat 66 and the friction rod 63.

[0038] Optionally, a circular arc groove 661 is provided at the left end of the movable seat 66, and a second elastic piece 65 is provided on the inner side of the circular arc groove 661. The middle part of the second elastic piece 65 is curved, and the left end of the second elastic piece 65 is connected to the left end of the circular arc groove 661. The abutment portion 651 at the right end of the second elastic piece 65 contacts the right end face of the circular arc groove 661, so that the left and right ends of the circular arc groove 661 give the second elastic piece 65 an outward elastic force.

[0039] Optionally, a limit block 67 is provided on the movable seat 66, and the first spring piece 64 is embedded between the limit block 67 and the arc groove 661. At the same time, the right end of the first spring piece 64 is located on the supporting portion 662 of the movable seat 66. The movable seat 66 provides support for the first spring piece 64 through the supporting portion 662. The movable seat 66 causes the first spring piece 64 to generate an inward elastic force through the limit block 67.

[0040] Optionally, the left end of the first spring piece 64 is in a curved shape, and the curved shape of the left end of the first spring piece and the curved shape of the middle part of the second spring piece 65 are respectively squeezed on the inner and outer sides of the friction rod 63, and at the same time, the friction rod 63 is clamped by the elastic force of the first spring piece 64 and the second spring piece 65, thereby finally realizing the connection between the friction rod 64 and the movable seat 66.

[0041] Optionally, a top column 68 is provided at the top of the movable seat 66, and the top column 68 is inserted into the piezoelectric mechanism mounting hole 43 at the bottom end of the frame 40. When the friction rod 64 drives the movable seat 66 to move upward, the movable seat 66 pushes the frame 40, the carrier 30 and the lens module 90 to move longitudinally.

[0042] Figure 5 and Figure 6 5-6, the frame 40 is formed as a triangular frame as a whole, and the three vertices of the triangular frame are the support points of the three piezoelectric mechanisms 60 respectively. A carrier mounting hole 41 is provided in the middle of the frame 40. In order to adapt to most carriers, the carrier mounting hole 41 is designed to be rectangular. A reed mounting groove 42 is also provided on the end corner of the frame 40 to install the reed 20.

[0043] Figure 7 1 is a three-dimensional diagram of a reed according to an embodiment of the present invention. Figure 6 As shown, the spring 20 is provided with three support block connecting pieces 21 and three frame connecting pieces 22. The three support block connecting pieces 21 and the three frame connecting pieces 22 are arranged at intervals and connected by spring wires 23. Three support blocks 50 are arranged on the outer side of the frame 40. The bottom ends of the three support blocks 50 are fixedly connected to the base 50. The three support blocks 50 are arranged in a triangular shape. The top ends of the three support blocks 50 are respectively connected to the three support block connecting pieces 21. The three frame connecting pieces 22 are connected to the spring installation grooves 42 on the frame 40. After the piezoelectric mechanism 60 is powered off, the elastic force of the spring 20 causes the frame 40, the carrier 30 and the lens module 90 to move downward, thereby returning to their original positions.

[0044] In summary, the piezoelectric gimbal of the present invention has broad commercial application scenarios and can be widely used in various electronic devices such as mobile phones and smart phones.

[0045] The preferred embodiments of the present invention have been described in detail above, but it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A piezoelectric pan / tilt head, characterized in that: The piezoelectric pan / tilt head comprises a housing, a spring, a carrier, a frame, a piezoelectric mechanism, a circuit module and a base, wherein the housing and the base are connected to form a hollow cavity, wherein the spring, the carrier, the frame, the piezoelectric mechanism and the circuit module are arranged in the hollow cavity, wherein the piezoelectric mechanism is arranged on the base and is electrically connected to the circuit module, the spring is arranged between the base and the frame and the base and the frame are movably connected, and the carrier is fixedly connected in the frame and is used to install the lens module; The piezoelectric pan / tilt head further comprises a support block, wherein the support block is fixedly connected to the base, and the spring sheet movably connects the support block and the frame; The spring sheet is provided with a support block connecting sheet and a frame connecting sheet, the support block connecting sheet and the frame connecting sheet are arranged at intervals and connected by spring wires, the support block connecting sheet is fixedly connected to the support block, and the frame connecting sheet is fixedly connected to the frame; The piezoelectric mechanism includes a counterweight block, a deformation block, a friction rod, a first spring sheet, a second spring sheet and a movable seat. The counterweight block is arranged on the base, a deformation block is arranged on the upper end of the counterweight block, a friction rod is arranged on the upper end of the deformation block, the circuit module is electrically connected to the deformation block, the first spring sheet, the second spring sheet and the movable seat are combined and the movable seat is connected to the friction rod.

2. The piezoelectric pan / tilt head according to claim 1, characterized in that: The spring sheet is provided with three supporting block connecting sheets and three frame connecting sheets, and the three supporting block connecting sheets and the three frame connecting sheets are arranged at intervals.

3. The piezoelectric pan / tilt platform according to claim 1, characterized in that: The frame forms a triangular frame as a whole, and the piezoelectric pan-tilt platform includes three piezoelectric mechanisms, and the three vertices of the triangular frame are respectively connected to the three piezoelectric mechanisms.

4. The piezoelectric pan / tilt head according to claim 1, characterized in that: A carrier mounting hole is provided in the middle of the frame to mount the carrier, and the carrier mounting hole is formed as a rectangular hole.

5. The piezoelectric pan / tilt platform according to claim 3, characterized in that: A spring installation groove is also provided on the end corner of the triangular frame, and the spring is connected to the frame by installing the frame connecting piece in the spring installation groove.

6. The piezoelectric pan / tilt platform according to claim 1, characterized in that: An arc groove is provided at one end of the movable seat, and the second spring piece is arranged on the inner side of the arc groove. The middle part of the second spring piece is in a curved arc shape. One end of the second spring piece is connected to one end of the arc groove, and the other end of the second spring piece is provided with an abutment portion. The abutment portion contacts the other end surface of the arc groove, and the two ends of the arc groove apply an outward elastic force to the second spring piece.

7. The piezoelectric pan / tilt platform according to claim 6, characterized in that: The movable seat is provided with a supporting portion and a limiting block, the first spring sheet is embedded between the limiting block and the arc groove, the other end of the first spring sheet is located on the supporting portion, the movable seat supports the first spring sheet through the supporting portion, and the movable seat applies an inward elastic force to the first spring sheet through the limiting block.

8. The piezoelectric pan / tilt platform according to claim 7, characterized in that: One end of the first spring sheet is in a curved shape, and the curved shape of one end of the first spring sheet and the curved shape of the middle part of the second spring sheet are respectively squeezed on the inner and outer sides of the friction rod, and the first spring sheet and the second spring sheet clamp the friction rod, thereby connecting the friction rod to the movable seat.

9. The piezoelectric pan / tilt platform according to claim 1, characterized in that: A top column is arranged at the top of the movable seat, a piezoelectric mechanism mounting hole is arranged at the bottom of the frame, the top column is inserted into the piezoelectric mechanism mounting hole, and when the friction rod drives the movable seat to move, the movable seat pushes the frame and the carrier to move.

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