WO2020224454A1

WO2020224454A1 - Lifting apparatus and electronic device

Info

Publication number: WO2020224454A1
Application number: PCT/CN2020/086715
Authority: WO
Inventors: 任晓龙; 王朝; 罗伟; 马雷; 张亮; 邓旭同
Original assignee: 华为技术有限公司
Priority date: 2019-05-05
Filing date: 2020-04-24
Publication date: 2020-11-12
Also published as: CN110242840A

Abstract

Provided in the present application are a lifting apparatus and an electronic device. The lifting apparatus is applied in the electronic device and is used to enable a camera in the electronic device to achieve a lifting motion. The lifting apparatus comprises a support, a motor, a camera support and a transmission mechanism, wherein the support is an injection molded part of a non-metallic material, the motor is disposed on the support, the camera support is slidably arranged on the support, the transmission mechanism is in transmission connection with the motor and the camera support, and the motor is used to drive the camera support to slide relative to the support by means of the transmission mechanism. The support is an injection molded part of a non-metallic material, and therefore has the advantages of low fabrication costs, a high production rate, and easy control over shape and precision, which greatly improves the competitiveness of the product. Furthermore, a non-metallic material is used for the support, which is therefore conducive to making the support lightweight and helps to reduce the weight of the electronic device; at the same time, a better anti-seismic performance may be provided due to the non-metallic material.

Description

Lifting device and electronic equipment

This application claims the priority of the Chinese patent application filed with the State Intellectual Property Office of China with the application number 201910377756.0, and the priority of the Chinese patent application with the title of "a lifting device and electronic equipment" on May 5, 2019. The entire content is incorporated into this application by reference.

Technical field

This application relates to the technical field of electronic equipment, and in particular to a lifting device and electronic equipment.

Background technique

At this stage, large screen sizes are widely used in electronic devices, subject to the overall size restrictions of electronic devices, and the size of the screen is also subject to certain restrictions. For example, the front of a mobile phone is usually equipped with components such as a display screen, a camera, and a speaker. Since the camera and the speaker also take up a certain amount of space, the size of the screen will be subject to certain restrictions.

In order to further increase the screen size, some manufacturers in the current market place the camera inside the mobile phone to make a certain space on the front of the mobile phone for placing the screen. Therefore, the screen size can be increased to a certain extent. Among them, the camera generally extends out of the mobile phone by lifting or retracts into the mobile phone. For example, the camera of some manufacturers can extend from the top of the mobile phone. When the camera is not needed, the camera is driven to retract into the mobile phone. However, when the motor drives the camera up and down, a large noise will be generated. In order to cover up the noise, The stage usually plays music when the camera is raised and lowered to cover up the noise, but this method cannot fundamentally reduce the noise generated when the camera is raised and lowered. At the same time, in a quieter environment, the user does not want any sound from the phone. Therefore, It is not conducive to improving the user experience.

Summary of the invention

The purpose of the present application is to provide a lifting device, which is used in an electronic device such as a mobile phone to enable a camera to achieve a lifting action.

The above goals and other goals will be achieved through the features in the independent claims. Further implementations are embodied in the dependent claims, description and drawings.

In the first aspect, the present application provides a lifting device, which is used in electronic equipment and is used to enable a camera to achieve a lifting action. The lifting device includes a bracket, a motor, a camera bracket, and a transmission mechanism; wherein the bracket is an injection molded part of a non-metallic material; the motor is arranged on the bracket; the camera bracket is slidably arranged on the bracket; the transmission mechanism and the motor and The camera support is in a transmission connection; wherein the motor is used to drive the camera support to slide relative to the support through the transmission mechanism. The bracket is an injection molded part of non-metallic materials, so it has the advantages of low production cost, high production rate, and easy control of shape and accuracy; thus, the competitiveness of the product is greatly improved. In addition, because the bracket is made of non-metallic materials, it is beneficial to realize the lightweight of the bracket and help reduce the weight of electronic equipment; at the same time, because the non-metallic materials can provide better seismic performance, it can weaken the motor during operation. The transmission of vibration reduces the noise of the lifting device during operation.

In specific implementation, the material of the bracket may be at least any one of polyethylene, polypropylene, polyvinyl chloride, and rubber. In the specific preparation, the stent can be made by an injection molding process; that is, the molten injection material can be injected into the injection mold for molding; the injection molding method can improve the production efficiency and quality of the stent.

In addition, the motor can be bonded to the bracket by adhesive; the assembly efficiency of the lifting device can be greatly improved by bonding; for example, during specific assembly, the motor can be placed on the bracket after the corresponding installation position , Adhesive is used to bond the motor and the bracket; the assembly process is simple and not easy to make mistakes, which can greatly improve the assembly efficiency and yield rate, and at the same time, it is easy to realize automatic assembly.

In specific implementation, the material of the adhesive is at least any one of polyethylene, polypropylene, and polyvinyl chloride. Wherein, the melting point of the adhesive may be lower than the melting point of the stent, so as to prevent the high-temperature adhesive from adversely affecting the shape and structure of the stent.

In an embodiment provided by the present application, the transmission mechanism includes a screw and a sliding frame that are screwed to each other; the screw is connected with the output shaft of the motor; the sliding frame is connected with the camera support; wherein When the motor drives the screw to rotate, the sliding frame drives the camera support to move along the axis of the screw.

In specific implementation, the sliding frame can be provided with a threaded structure that is screwed with the screw. When the screw rotates, the sliding frame moves along the axis of the screw, thereby driving the camera bracket to move along the axis of the screw. .

In addition, in order to avoid damage to the structural parts or motors in the lifting device when the camera is subjected to external force, the transmission mechanism further includes an elastic part; the sliding frame and the camera support are connected by the elastic part. Specifically, when the camera is subjected to an external force, the external force can be absorbed by the deformation of the elastic member, so as to avoid damage to the structural member in the lifting device due to excessive force, and also to prevent the motor from burning due to excessive load.

In another embodiment provided by this application, the transmission mechanism further includes a sliding rod, the sliding rod is arranged on the bracket, and the axis of the sliding rod is parallel to the axis of the screw; Both the sliding frame and the camera support are slidably connected with the sliding rod. This structural arrangement helps to improve the stability of the sliding frame and the camera support during the movement, and at the same time, prevents the sliding frame from rotating relative to the lead screw, thereby helping to improve transmission efficiency.

In a second aspect, the present application also provides an electronic device, including a housing, a camera, and any one of the above-mentioned lifting devices; the bracket is arranged on the housing, and the camera is arranged on the camera bracket.

In specific implementation, in order to reduce the vibration transmitted from the lifting device to the housing, a shock-absorbing material can be arranged between the bracket and the housing; wherein the shock-absorbing material can effectively reduce the transmission of vibration between the housing and the housing; Absorb the noise generated by the motor during operation, thereby improving the user experience.

In order to improve the stability of the camera during action, in the embodiment provided by the present application, the electronic device further includes a positioning member, the positioning member is fixed in the housing, and the camera has a sliding groove; wherein, the positioning member may It is slidably arranged in the sliding groove, and the length direction of the sliding groove is parallel to the sliding direction of the camera. In this way, it is possible to effectively prevent the camera from shaking relative to the housing of the electronic device, thereby improving the stability of the camera in action.

Description of the drawings

Fig. 1 is a schematic structural diagram of a lifting device provided by an embodiment of the application;

Figure 2 is an exploded view of the lifting device provided by an embodiment of the application;

3 is a schematic diagram of a part of the structure of a lifting device provided by another embodiment of the application;

4 is a schematic structural diagram of a camera provided by another embodiment of the application;

FIG. 5 is a schematic structural diagram of the lifting device provided by the embodiment of the application after being connected to the camera;

FIG. 6 is a schematic structural diagram of an electronic device provided by an embodiment of the application;

FIG. 7 is a schematic diagram of another structure of an electronic device provided by an embodiment of the application;

FIG. 8 is a structural block diagram of a stepping motor system provided by an embodiment of the application;

9 is a schematic diagram of a cross-sectional structure of a stepping motor provided by an embodiment of the application;

10 is a schematic diagram of a partial structure of a stepping motor provided by an embodiment of the application;

11 is a schematic diagram of the structure of a stepping motor provided by an embodiment of the application;

FIG. 12 is a schematic structural diagram of the stepping motor provided by an embodiment of the application when it is in a first rotating state;

FIG. 13 is a schematic structural diagram of a stepping motor provided by an embodiment of the application when it is in a second rotation state;

14 is a schematic structural diagram of the stepping motor provided by an embodiment of the application when it is in a third rotation state;

FIG. 15 is a subdivided waveform of the phase A current provided by the embodiment of the application;

FIG. 16 is another subdivided waveform of the phase A current provided by the embodiment of the application;

FIG. 17 is another subdivided waveform of the phase A current provided by the embodiment of the application;

FIG. 18 is a waveform diagram of phase A current provided by an embodiment of the application;

FIG. 19 is a schematic diagram of an H-bridge circuit provided by an embodiment of the application.

Detailed ways

The terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not intended to limit the application. As used in the specification and appended claims of this application, the singular expressions "a", "an", "said", "above", "the" and "this" are intended to also This includes expressions such as "one or more" unless the context clearly indicates to the contrary. It should also be understood that in the following embodiments of the present application, “at least one” and “one or more” refer to one, two or more than two. The term "and/or" is used to describe the association relationship of associated objects, which means that there can be three kinds of relationships; for example, A and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. Among them, A and B can be singular or plural. The character "/" generally indicates that the associated objects are in an "or" relationship.

References described in this specification to "one embodiment" or "some embodiments", etc. mean that one or more embodiments of the present application include a specific feature, structure, or characteristic described in combination with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification are not necessarily All refer to the same embodiment, but mean "one or more but not all embodiments" unless it is specifically emphasized otherwise. The terms "including", "including", "having" and their variations all mean "including but not limited to" unless otherwise specifically emphasized. In order to facilitate the understanding of the lifting device provided by the embodiments of the present application, the following first describes its application scenarios. The lifting device can generally be applied to electronic devices, such as mobile phones, tablet computers, or notebook computers. However, no matter what kind of electronic equipment is used, it may all include the lifting device disclosed in this application.

Nowadays, considering the portability of electronic devices (such as mobile phones, etc.), the overall size of electronic devices will not be set particularly large. However, in order to enhance the user experience, the screen size is usually set to be maximized; The screen can provide users with more display content and better visual effects, but the front of the electronic device needs to be set with more other functional components in addition to the screen.

Taking a mobile phone as an example, the front of a mobile phone is usually equipped with a display screen, a camera, and a speaker. Among them, the user can use the camera to realize self-portrait, video call and other functions. In order to avoid the space occupied by the camera on the front of the mobile phone, the mobile phone application can be lifted The camera, that is, the camera can realize the lifting action through the lifting device; for example, when the user needs to take pictures or video calls, the lifting device can control the camera to extend from the inside of the phone, and when the camera is not needed, the lifting device can control the camera to retract into the phone Internally, however, when the lifting device controls the camera to extend and retract, it will generate a lot of noise, which will affect the internal components of the mobile phone and reduce the user’s experience. For this reason, the embodiment of the application provides a A lifting device that can improve the noise problem, thereby reducing the negative impact on other devices inside the mobile phone, and also improving the user experience.

As shown in Figures 1 and 2, in an embodiment provided in the present application, the lifting device 10 includes a bracket 110, a motor 120, and a transmission mechanism (not shown in the figure), wherein the transmission mechanism may include a screw 140 and a sliding Bracket 150 and other components) and camera bracket 130; wherein the bracket 110 is used to install the motor 120 or the transmission mechanism on the housing of the electronic device, and the camera bracket 130 is used to install the camera on the lifting device; the motor 120 drives the camera through the transmission mechanism The bracket 130 realizes the lifting action, so that the camera can realize the lifting action relative to the electronic device; among them, in a specific application, the camera can communicate with the circuit board, power supply, and processing of the electronic device through a flexible printed circuit (FPC). The components such as the device are electrically connected to realize the transmission of electric energy and electric signals.

In a specific implementation, the bracket 110 may be an integrally formed injection molded part, so that the manufacturing cost of the bracket 110 can be reduced, and at the same time, the weight of the bracket 110 can be reduced. In the specific production, the molten injection material can be injected into the injection mold for molding. The injection molding method can increase the production rate of the stent 110 and facilitate automated production. In addition, the shape and accuracy of the stent 110 can also be well controlled, thereby ensuring the quality of the stent 110.

Among them, the material of the injection molding material may specifically be non-metallic materials such as polyethylene, polypropylene, polyvinyl chloride, rubber, etc., of course, it may also be a mixture of two or more of the foregoing.

When the motor 120 is installed on the support 110, various methods can be used. For example, in an embodiment provided in this application, an adhesive may be used to bond the motor 120 to the bracket 110. In this way, the assembly efficiency can be improved to a large extent, and the production cost can be reduced. In addition, since some adhesives have certain elasticity, they can also reduce the transmission of noise, that is, the vibration generated by the motor 120 during operation can be absorbed by the adhesive, thereby reducing the vibration transmitted to the bracket 110; At the same time, since the bracket 110 can be made of non-metallic materials such as polyethylene, polypropylene, polyvinyl chloride, rubber, etc., it also has good shock absorption characteristics, thereby reducing the noise of the entire lifting device.

Normally, an electronic device is provided with a receiving cavity to accommodate the lifting device. Therefore, the vibration generated when the lifting device is in motion will be directly transmitted to the electronic device, and it is likely to cause resonance with the electronic device. In order to avoid the vibration generated by the lifting device when the camera is raised and lowered is directly transmitted to the electronic equipment, and the electronic equipment causes resonance, as shown in Figures 6 and 7, taking a mobile phone as an example, an embodiment provided in this application In this case, a sound absorbing material 50 may be provided between the lifting device 10 and the housing 410 of the mobile phone 40.

In some embodiments, the sound absorbing material 50 may be foam, silicone sheet, etc.; for example, when the sound absorbing material is foam, it may be arranged between the lifting device 10 and the mobile phone housing 410. Of course, the sound absorbing material can also be arranged on the periphery of the motor 120 or other structural parts to further improve the noise reduction effect.

In addition, there are many ways to install the bracket 110 in the electronic device. For example, a screw can be used; specifically, a through hole or a threaded hole can be provided on the bracket, and a threaded hole or a through hole can be provided in the electronic device; the screw passes through the through hole and is screwed with the threaded hole to realize the connection between the bracket and the electronic device. Fixed connection between.

In addition, an adhesive can also be used to adhere the bracket 110 in the electronic device. In this way, the assembly efficiency can be improved to a large extent, and the production cost can be reduced. In addition, since some adhesives have certain elasticity, they can also reduce noise, that is, the vibration generated by the lifting device during operation can be absorbed by the adhesive, thereby reducing the vibration transmitted to the electronic device.

In specific implementation, thermosetting glue can also be used to bond the bracket 110 in the electronic device; wherein the specific material of the thermosetting glue can be polyethylene, polypropylene, polyvinyl chloride, polystyrene, and the like.

In addition, when the motor 120 is fixed on the bracket 110 with an adhesive, the adhesive may specifically be thermosetting glue; wherein the specific material of the thermosetting glue may be polyethylene, polypropylene, polyvinyl chloride, Polystyrene etc.

Since thermosetting glue is used to fix the motor 120 on the bracket 110, the thermosetting glue needs to be heated during this process, which may accelerate the loss of lubricating oil in the motor 120 during the heating process; therefore, in this application In an embodiment provided, after thermosetting glue is used to fix the motor 120 on the bracket 110, the worker can supplement the oil to the motor 120 to improve the lubrication effect between the moving parts of the motor 120, so that the To a certain extent, reduce the noise generated by the motor during operation.

Among them, in some embodiments, the motor 120 can realize the lifting action of the camera through the transmission mechanism, wherein the specific structure of the transmission mechanism can be set in multiple types. As shown in FIG. 1 and FIG. 2, in an embodiment provided by the present application, the motor 120 can realize the lifting of the camera bracket through the transmission form of a screw nut.

Specifically, the output shaft of the motor 120 is connected with the screw 140. When the output shaft rotates, the screw 140 is driven to rotate together. When the screw 140 rotates, the screw 140 and the nut rotate relative to each other, thereby driving the nut along the screw 140 Make a linear movement in the axial direction.

Wherein, in the embodiment provided in the present application, the transmission mechanism may further include a sliding frame 150, and the nut and the sliding frame are constructed as an integral structure; specifically, the sliding frame 150 is provided with a threaded structure for matching with the screw 140 When the motor 120 drives the screw 140 to rotate, the screw 140 and the sliding frame 150 can rotate relative to each other, so that the sliding frame 150 is driven to move linearly along the axial direction of the screw 140.

In order to ensure the smoothness of the sliding frame 150 during movement, in other embodiments, the transmission mechanism may further include a sliding rod 160 arranged on the bracket 110; the sliding frame 150 has a sliding hole that is slidably matched with the sliding rod 160. The rod 160 is slidably inserted in the sliding hole of the sliding frame 150; wherein, the axis of the sliding rod 160 and the axis of the screw 140 are parallel to each other and are arranged differently.

When the motor 120 drives the screw 140 to rotate, the screw 140 and the sliding frame 150 rotate relative to each other. At the same time, under the action of the sliding rod 160, the sliding frame 150 can only slide up the axial direction of the screw 140 or the sliding rod 160. It cannot rotate, so the stability and smoothness of the sliding frame 150 when sliding is ensured.

In the above-mentioned embodiment provided by the present application, the lead screw 140 is positioned on the support 110. In order to ensure the positioning accuracy of the lead screw 140, as shown in FIG. 2, the lead screw 140 can be set on the support 110 through a bearing 180; in addition, Arranging the screw 140 on the bracket 110 through the bearing 180 can also reduce the frictional resistance of the screw 140 during rotation, and at the same time, can also reduce the noise generated by the screw 140 during the rotation.

In the embodiment provided in this application, the camera bracket 130 is connected to the sliding frame 150. When the sliding frame 150 is raised and lowered, the camera bracket 130 can be driven to perform a lifting action.

Among them, the camera may be hindered by external forces when it extends out of the electronic device. For example, when the camera gradually extends out of the electronic device, it may be blocked by the user's hand or other objects. In order to prevent the motor from overloading and the structural parts of the lifting device from being damaged, in an embodiment provided in this application, the transmission mechanism Also includes springs.

Specifically, as shown in FIG. 3, the sliding frame 150 and the camera support 130 may be connected by a spring 170. 1 and 2 at the same time, when the camera needs to be extended out of the electronic device, the motor 120 rotates, and the sliding frame 150 is driven to slide through the lead screw 140, and the sliding frame 150 drives the camera bracket 130 to slide through the spring 170, thereby moving the camera Push out from the electronic device; in the process, if the camera is obstructed and cannot continue to extend, the spring 170 is compressed, and the sliding frame 150 can continue to slide under the drive of the motor, thereby ensuring the structure of the motor and the lifting device The safety, to prevent the motor overload and the structural parts are damaged by excessive force. In addition, when the camera is retracted into the electronic device, it may be unable to move due to external force; for example, when the user holds the camera to prevent it from retracting into the electronic device, the motor can still drive the sliding frame 150 to slide. At this time, the spring 170 It is stretched to ensure the safety of the structural parts in the motor and the lifting device, and prevent the motor from being overloaded and the structural parts from being damaged by excessive force.

In order to ensure the stability of the camera bracket 130 when sliding, the camera bracket is slidably disposed on the slide bar 160; the camera bracket 130 has a sliding hole that matches with the slide bar 160.

As shown in Figures 4 and 5, in order to ensure the stability of the camera 20 when sliding and prevent the camera 20 from shaking relative to the electronic device; in an embodiment provided in the present application, the electronic device has a positioning member 30, and the camera 20 is provided There is a sliding groove 210 which is slidingly fitted with the positioning member 30, wherein the length direction of the sliding groove 210 is parallel to the axis of the screw 140 or the sliding rod 160; specifically, when the camera is driven by the motor 120 During the lifting action, the positioning member 30 can slide relative to the camera 20 in the slide groove 210; in addition, the positioning member 30 abuts against the left and right side walls of the slide groove 210 or maintains a small gap, thereby preventing the camera 20 from positioning Piece 30 shakes.

In addition, the cooperation of the positioning member 30 and the sliding groove 210 can also limit the travel of the camera 20 when it is raised and lowered. For example, when the camera extends out of the electronic device for a certain length, the positioning member 30 abuts against the side wall of the lower part of the slide groove 210, thereby preventing the camera from continuing to extend; when the camera is retracted into the electronic device, the positioning member 30 and the slide groove 210 The upper side walls are against each other to prevent the camera from continuing to retract.

In some other embodiments, the stroke of the camera during lifting can also be controlled by a motor. For example, the motor can be a stepper motor; because a stepper motor is a component that converts an electrical pulse signal into a mechanical angular displacement, and an electrical pulse signal can drive the stepper motor to rotate by a step angle, therefore, the stepper motor The rotation angle of the rotor is proportional to the number of electrical pulses, so the number of pulse signals can be directly controlled to control the rotation angle of the rotor in the stepper motor, and then the stroke of the camera.

Specifically, as shown in Figure 8, a stepper motor system generally includes a controller, a driver, and a stepper motor. Among them, the controller is used to generate pulse signals to the driver; in specific implementation, the controller can be a single-chip microcomputer, a control card, etc., or can be a power management IC (power management IC) in an electronic device. The function of the driver is to convert the pulse signal sent by the controller into angular displacement and then send it to the stepper motor to drive the stepper motor to rotate. The running speed of the stepper motor is proportional to the frequency of the pulse signal, and the angle the rotor rotates is proportional to the number of pulse signals.

As shown in Figure 9, in structure, the stepping motor 120 can be composed of two parts: a stator 121 and a rotor 122, wherein the stator 121 and the rotor 122 are both magnetic materials; for example, in an embodiment provided in this application, please Referring to Figure 11, the rotor 122 has ten magnetic poles, of which ten magnetic poles are evenly distributed at intervals of N poles and S poles; as shown in Figure 10, the stator has a first layer of claw poles 1211 and a second layer of claw poles 1212, where, The outer periphery of the first layer of claw poles 1211 is provided with a control winding, which is marked as the A phase winding. When the A phase winding is energized, the first layer of claw poles 1211 will produce alternating N and S magnetic poles; the second layer of claw poles 1212 There is a control winding around the outside, which is marked as the B-phase winding. When the B-phase winding is energized, the second layer of claw poles 1212 will produce alternating N and S magnetic poles; when the stepper motor is working, the A-phase winding and the B-phase winding Simultaneously energize, change the position of the N and S magnetic poles by changing the energization direction of the A-phase winding and the B-phase winding to drive the rotor to rotate.

As shown in Figure 12, at this time the A-phase winding carries forward current, and the B-phase winding carries forward current. As shown in Figure 13, when the phase A winding is changed to a negative current and the phase B winding passes a positive current, the positions of the N and S magnetic poles in the first layer of claw poles 1211 are replaced, thereby driving the rotor 122 to rotate in a clockwise direction . As shown in Figure 14, when the phase A winding carries negative current and the phase B winding is changed to carry negative current, the positions of the N and S magnetic poles in the second claw pole 1212 are replaced, thereby continuing to drive the rotor to rotate in the clockwise direction. .

In order to reduce the noise generated by the stepper motor during operation, in an embodiment provided in the present application, the driver can use the PWM subdivision technology to drive the stepper motor. Specifically, the current passing through each control winding is changed from a conventional rectangular wave to a step-up or down wave. That is, a number of stable intermediate states are given between 0 and the maximum value.

As shown in Figure 15, an example of a subdivided waveform of phase A current; among them, Im represents the maximum current value. The traditional pulse current is either zero or the maximum value Im. In the embodiment provided in this application, the pulse current is subdivided, and the zero to the maximum value is divided into multiple segments; as shown in FIG. 16 and FIG. 17, as the number of segments increases, the waveform continuously approaches a sine wave. In practical applications, the number of segments ranges from 2 to 32 or more.

In this way, the vibration of the rotor during rotation can be reduced, thereby reducing the noise of the stepping motor.

Under normal circumstances, the driver relies on the inductance characteristics of the control winding in the stepper motor to achieve PWM current regulation. As the PWM control starts, the power supply voltage is added to the motor windings to generate drive current. Once the current reaches the set value, the H-bridge circuit in the driver (see Figure 19) will switch the control state so that the output current is attenuated. In this process, the current will decay sharply. As shown in Figure 18, since the value of Im is greater than the set value, under the control of the H-bridge circuit, the current will be attenuated sharply, which can increase the vibration and noise of the rotor. For this reason, in the embodiment provided by the present application, the maximum current value Im can be weakened so that the maximum current value Im is not greater than the set value. Therefore, it will not cause a sharp attenuation of the current, which can also improve the rotation of the rotor. The smoothness of time and reduce noise. In specific implementation, the maximum current value can be obtained through a large number of experiments. For example, the power supply IC in an electronic device can appropriately reduce the output of the maximum current value, thereby improving the smoothness of the rotor during rotation.

In addition, when the stepping motor drives the camera up and down, in order to achieve a good lifting effect, the torque generated by the stepping motor can be set to have a larger difference with respect to the resistance received by the camera during the up and down process.

Specifically, the resistance encountered by the camera during the lifting process includes, but is not limited to, the frictional resistance generated by the components in the transmission mechanism when they move with each other. For example, when the sliding frame slides relative to the support, there will be a certain friction resistance between the sliding frame and the sliding rod; when the lead screw and the sliding frame rotate relatively, a certain friction resistance will also be generated.

Through the above design, because the pulse current used to drive the stepping motor is too large, the noise generated by the motor will be increased. Therefore, in the embodiment provided in the present application, the maximum value of the pulse current Im is reasonably reduced, so that the torque generated by the stepping motor is slightly larger than the resistance encountered when the camera is raised and lowered, thereby reducing the noise generated by the motor during operation. .

Of course, in specific implementation, the resistance value of the resistor R1 in the H-bridge circuit can also be adjusted, or the pulse current value Im and the resistance R1 can be adjusted at the same time to achieve the effect of reducing the noise generated during the operation of the motor.

As used in the above embodiments, depending on the context, the term "when" or "after" can be interpreted as meaning "if..." or "after" or "in response to determining..." or "in response to detecting …". Similarly, depending on the context, the phrase "when determining..." or "if detected (statement or event)" can be interpreted as meaning "if determined..." or "in response to determining..." or "when detected (Condition or event stated)" or "in response to detection of (condition or event stated)". In addition, in the foregoing embodiments, relationship terms such as first and second are used to distinguish one entity from another entity, and any actual relationship and order between these entities are not limited.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website site, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).

It should be pointed out that a part of this patent application file contains content protected by copyright. Except for making copies of patent documents or recorded contents of patent documents in the Patent Office, the copyright owner reserves the copyright.

Claims

A lifting device, characterized in that it comprises:

The bracket is an injection molded part of non-metallic materials;

The motor is arranged on the bracket;

The camera bracket is slidably arranged on the bracket;

A transmission mechanism, which is in transmission connection with the motor and the camera support;

Wherein, the motor is used to drive the camera support to slide relative to the support through the transmission mechanism.
The lifting device according to claim 1, wherein the motor is bonded to the bracket by an adhesive.
The lifting device according to claim 2, wherein the material of the adhesive is at least any one of polyethylene, polypropylene, and polyvinyl chloride.
The lifting device according to any one of claims 1 to 3, wherein the material of the bracket is at least any one of polyethylene, polypropylene, polyvinyl chloride, and rubber.
The lifting device according to any one of claims 1 to 4, wherein the transmission mechanism comprises a lead screw and a sliding frame that are screwed to each other;

The lead screw is connected with the output shaft of the motor;

The sliding frame is connected with the camera bracket;

Wherein, when the motor drives the screw to rotate, the sliding frame drives the camera support to move along the axis of the screw.
The lifting device according to claim 5, wherein the transmission mechanism further comprises an elastic member; the sliding frame and the camera support are connected by the elastic member.
The lifting device according to claim 5, wherein the transmission mechanism further comprises a sliding rod, the sliding rod is arranged on the bracket, and the axis of the sliding rod is parallel to the axis of the screw ；

Both the sliding frame and the camera support are slidably connected with the sliding rod.
An electronic device, characterized by comprising a housing, a camera, and the lifting device according to any one of claims 1 to 7;

The bracket is arranged on the housing, and the camera is arranged on the camera bracket.
8. The electronic device according to claim 8, further comprising a shock-absorbing material, and the shock-absorbing material is disposed at least between the bracket and the housing.
The electronic device according to claim 8, further comprising a positioning member, the positioning member is fixed in the housing, and the camera has a sliding groove;

Wherein, the positioning member is slidably arranged in the sliding groove, and the length direction of the sliding groove is parallel to the sliding direction of the camera.